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Wed, 02 Jul 2025 08:12:57 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: 5d26c4ce-571c-11f0-a313-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751443977; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=pmrwFewWEb//FrXkeXoW39+51hKI+iB3NXqjXALFneU=; b=Pu+oPjAInqDI5v008Y0RIoqBGss1CWZJQfjSeldYYLHYt/iaZCTKwnypkp1wm4C2IVwFch JxwxEcQOcCptGNadVK8WDO9ae0e+eOGXRyoZAGrK08zN2Ly4WXjq54WvO1zhPBIvqQOy3M Sw27FmTQ8oTngCHbJ/yNk+Xe6zxaQjA= Authentication-Results: smtp-out1.suse.de; dkim=pass header.d=suse.com header.s=susede1 header.b=Pu+oPjAI DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751443977; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=pmrwFewWEb//FrXkeXoW39+51hKI+iB3NXqjXALFneU=; b=Pu+oPjAInqDI5v008Y0RIoqBGss1CWZJQfjSeldYYLHYt/iaZCTKwnypkp1wm4C2IVwFch JxwxEcQOcCptGNadVK8WDO9ae0e+eOGXRyoZAGrK08zN2Ly4WXjq54WvO1zhPBIvqQOy3M Sw27FmTQ8oTngCHbJ/yNk+Xe6zxaQjA= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 00/19] Make Xenstore-stubdom live update possible Date: Wed, 2 Jul 2025 10:12:35 +0200 Message-ID: <20250702081254.14383-1-jgross@suse.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Queue-Id: B2AAE2117F X-Rspamd-Action: no action X-Spam-Flag: NO X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; 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The main problem to solve was to keep the 9pfs device used to store and later retrieve the Xenstore state usable across kexec(). This has been achieved by using a module containing the shared pages of the device and the related config data. This module is then passed to the new kernel via linking it to the struct hvm_start_info. The rest of the series are some missing bits and pieces to have a sane state when activating the new kernel, and some minor fixes and cleanups. In order to be able to perform a Xenstore live update an associated patch series for Xen is needed. The Xen series is depending on this Mini-OS patch series. Juergen Gross (19): setup: add global pointer for struct hvm_start_info mini-os: kexec: add O_CLOEXEC support mini-os: grants: support populated grant table at boot time: unbind VIRQ_TIMER across kexec mm: refactor init_page_allocator() mm: don't add module pages to free memory kexec: fix physical addresses in start info data e820: don't count lapic page as initially reserved kexec: restructure building the start info data e820: use special type for software reserved memory mini-os: config: add support for config items with numerical values mini-os: kexec: add support for handing over some memory across kexec kexec: add support for allocating pages from kexec module memory 9pfs: store bepath in struct struct dev_9pfs 9pfs: refactor init_9pfront() gnttab: remove gnttab_alloc_and_grant() function gnttab: add function to obtain memory address from grantref 9pfs: add support to keep device opened across kexec events: export bind_evtchn() 9pfront.c | 267 +++++++++++++++++++++++++++++++----------- Config.mk | 6 + arch/x86/kexec.c | 113 ++++++++++++++++-- arch/x86/mm.c | 98 ++++++++++++++++ arch/x86/setup.c | 48 +++++++- arch/x86/time.c | 14 +++ e820.c | 11 +- events.c | 1 + gnttab.c | 21 ++-- include/9pfront.h | 9 ++ include/e820.h | 2 + include/fcntl.h | 6 + include/gnttab.h | 2 +- include/hypervisor.h | 3 + include/kernel.h | 1 + include/kexec.h | 98 ++++++++++++++++ include/lib.h | 1 + include/mm.h | 4 + include/x86/arch_mm.h | 1 + kexec.c | 118 +++++++++++++++++++ lib/sys.c | 44 ++++++- mm.c | 134 +++++++++++++-------- 22 files changed, 858 insertions(+), 144 deletions(-) -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Wed Jul 02 08:13:08 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 02 Jul 2025 08:13:08 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1030379.1404031 (Exim 4.92) (envelope-from ) id 1uWsaa-000077-7Z; 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bh=N4f9gptLjJY0e6N/f33d13mKNX3TplFpE0BIUSgd+yE=; b=t7MrFrm0/HDLCcTybXibhpoWM5oUKjxCEPNzzq6FlaGy9g287RDAAaGKRhOfuz2J1d4Nsz HlEVo9DAmC4CYgobgxUXDP8yIIKBVI/jflTHT9ifNgMXRd+oNQ7SzFgK7epfaW6t+cBJ/u o/UOoVYCb0s09NU/ULlKtIvzbfzAs/s= Authentication-Results: smtp-out1.suse.de; dkim=pass header.d=suse.com header.s=susede1 header.b=t7MrFrm0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751443983; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=N4f9gptLjJY0e6N/f33d13mKNX3TplFpE0BIUSgd+yE=; b=t7MrFrm0/HDLCcTybXibhpoWM5oUKjxCEPNzzq6FlaGy9g287RDAAaGKRhOfuz2J1d4Nsz HlEVo9DAmC4CYgobgxUXDP8yIIKBVI/jflTHT9ifNgMXRd+oNQ7SzFgK7epfaW6t+cBJ/u o/UOoVYCb0s09NU/ULlKtIvzbfzAs/s= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 01/19] setup: add global pointer for struct hvm_start_info Date: Wed, 2 Jul 2025 10:12:36 +0200 Message-ID: <20250702081254.14383-2-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250702081254.14383-1-jgross@suse.com> References: <20250702081254.14383-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Queue-Id: 43E542118B X-Rspamd-Action: no action X-Spam-Flag: NO X-Spamd-Result: default: False [-3.01 / 50.00]; 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Add a generic function to set the pointer. Signed-off-by: Juergen Gross --- arch/x86/setup.c | 20 +++++++++++++++++--- include/hypervisor.h | 3 +++ 2 files changed, 20 insertions(+), 3 deletions(-) diff --git a/arch/x86/setup.c b/arch/x86/setup.c index ed28d940..2085ee5c 100644 --- a/arch/x86/setup.c +++ b/arch/x86/setup.c @@ -69,6 +69,11 @@ static inline void sse_init(void) { start_info_t *start_info_ptr; EXPORT_SYMBOL(start_info_ptr); +static void set_info_ptr(start_info_t *ptr) +{ + start_info_ptr = ptr; +} + #define hpc_init() shared_info_t *map_shared_info(void) @@ -123,6 +128,17 @@ static void print_start_of_day(void *p) printk(" stack: %p-%p\n", stack, stack + sizeof(stack)); } #else + +/* + * This pointer holds a reference to the hvm_start_info struct. + */ +struct hvm_start_info *hvm_start_info_ptr; + +static void set_info_ptr(struct hvm_start_info *ptr) +{ + hvm_start_info_ptr = ptr; +} + static void hpc_init(void) { uint32_t eax, ebx, ecx, edx, base; @@ -176,9 +192,7 @@ arch_init(void *par) { static char hello[] = "Bootstrapping...\n"; -#ifdef CONFIG_PARAVIRT - start_info_ptr = par; -#endif + set_info_ptr(par); hpc_init(); (void)HYPERVISOR_console_io(CONSOLEIO_write, strlen(hello), hello); diff --git a/include/hypervisor.h b/include/hypervisor.h index d199f039..93f1247f 100644 --- a/include/hypervisor.h +++ b/include/hypervisor.h @@ -33,6 +33,9 @@ extern start_info_t *start_info_ptr; #define start_info (*start_info_ptr) #else +#include + +extern struct hvm_start_info *hvm_start_info_ptr; int hvm_get_parameter(int idx, uint64_t *value); int hvm_set_parameter(int idx, uint64_t value); #endif -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Wed Jul 02 08:13:12 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 02 Jul 2025 08:13:12 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1030381.1404036 (Exim 4.92) (envelope-from ) id 1uWsae-0000D6-9C; Wed, 02 Jul 2025 08:13:12 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1030381.1404036; 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Wed, 2 Jul 2025 08:13:08 +0000 (UTC) Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id AA54D13A24; Wed, 2 Jul 2025 08:13:08 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id xuohKBTqZGj8SAAAD6G6ig (envelope-from ); Wed, 02 Jul 2025 08:13:08 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: 63e1976a-571c-11f0-a313-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751443988; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=OogoM4iMQHWV+6sWu3sxpe6GFoI8m1ZNv0L6fcMW6nA=; b=N0rSvNMB3NiZDLE+mkszMPJA5aAkaURzSnb1wVGxCll7VqckVjuWLESyGNKVCOhL86z5zZ xu6g0JOOd1t1Vw/gx9po/Cs4r8Le3UjhZ4b44aukn9LhuSfvZ02j9qrrI2YmwJHkPbsML4 EebUbhNlFlqzNjyhb9JagEqCLhpaN68= Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751443988; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=OogoM4iMQHWV+6sWu3sxpe6GFoI8m1ZNv0L6fcMW6nA=; b=N0rSvNMB3NiZDLE+mkszMPJA5aAkaURzSnb1wVGxCll7VqckVjuWLESyGNKVCOhL86z5zZ xu6g0JOOd1t1Vw/gx9po/Cs4r8Le3UjhZ4b44aukn9LhuSfvZ02j9qrrI2YmwJHkPbsML4 EebUbhNlFlqzNjyhb9JagEqCLhpaN68= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 02/19] mini-os: kexec: add O_CLOEXEC support Date: Wed, 2 Jul 2025 10:12:37 +0200 Message-ID: <20250702081254.14383-3-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250702081254.14383-1-jgross@suse.com> References: <20250702081254.14383-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:email,suse.com:mid,imap1.dmz-prg2.suse.org:helo]; RCVD_TLS_ALL(0.00)[] X-Spam-Level: X-Spam-Flag: NO X-Spam-Score: -2.80 Define O_CLOEXEC as a non-zero value and add a kexec callback to cycle over all open files to close them in case O_CLOEXEC was specified when opening the file. This requires the addition of a cloexec boolean in struct file. Signed-off-by: Juergen Gross --- include/fcntl.h | 6 ++++++ include/lib.h | 1 + lib/sys.c | 44 +++++++++++++++++++++++++++++++++++++++++++- 3 files changed, 50 insertions(+), 1 deletion(-) diff --git a/include/fcntl.h b/include/fcntl.h index cc59b3ca..3205daed 100644 --- a/include/fcntl.h +++ b/include/fcntl.h @@ -3,6 +3,9 @@ #ifdef HAVE_LIBC #include_next +#ifndef O_CLOEXEC +#define O_CLOEXEC 0x40000 /* Use newlib's value for WIN32 and CYGWIN. */ +#endif #else /* open/fcntl - O_SYNC is only implemented on blocks devices and on files @@ -25,6 +28,9 @@ #define O_DIRECTORY 0200000 /* must be a directory */ #define O_NOFOLLOW 0400000 /* don't follow links */ #define O_NOATIME 01000000 +#ifndef O_CLOEXEC +#define O_CLOEXEC 02000000 +#endif #define F_DUPFD 0 /* dup */ #define F_GETFD 1 /* get close_on_exec */ diff --git a/include/lib.h b/include/lib.h index de67bab0..ea146496 100644 --- a/include/lib.h +++ b/include/lib.h @@ -174,6 +174,7 @@ extern struct wait_queue_head event_queue; struct file { unsigned int type; bool read; /* maybe available for read */ + bool cloexec; off_t offset; union { int fd; /* Any fd from an upper layer. */ diff --git a/lib/sys.c b/lib/sys.c index 481067f7..7dc236e0 100644 --- a/lib/sys.c +++ b/lib/sys.c @@ -26,6 +26,7 @@ #include #include #include +#include #include #include #include @@ -221,6 +222,7 @@ int alloc_fd(unsigned int type) if (files[i].type == FTYPE_NONE) { files[i].type = type; files[i].offset = 0; + files[i].cloexec = false; pthread_mutex_unlock(&fd_lock); return i; } @@ -231,6 +233,39 @@ int alloc_fd(unsigned int type) } EXPORT_SYMBOL(alloc_fd); +#ifdef CONFIG_KEXEC +static int kexec_close_files(bool undo) +{ + unsigned int i; + static int closed = 0; + + if ( undo ) + { + if ( closed ) + printk("Can't undo closing files!\n"); + closed = 0; + + return 0; + } + + pthread_mutex_lock(&fd_lock); + + for ( i = 0; i < NOFILE; i++ ) + { + if ( files[i].type != FTYPE_NONE && files[i].cloexec ) + { + close(i); + closed++; + } + } + + pthread_mutex_unlock(&fd_lock); + + return 0; +} +kexec_call(kexec_close_files); +#endif + void close_all_files(void) { int i; @@ -374,6 +409,7 @@ int open(const char *pathname, int flags, ...) struct mount_point *mnt; mode_t mode = 0; va_list ap; + int fd; if ( flags & O_CREAT ) { @@ -390,7 +426,13 @@ int open(const char *pathname, int flags, ...) mlen = strlen(mnt->path); if ( !strncmp(pathname, mnt->path, mlen) && (pathname[mlen] == '/' || pathname[mlen] == 0) ) - return mnt->open(mnt, pathname + mlen, flags, mode); + { + fd = mnt->open(mnt, pathname + mlen, flags, mode); + if ( fd >= 0 && (flags & O_CLOEXEC) ) + files[fd].cloexec = true; + + return fd; + } } errno = EIO; -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Wed Jul 02 08:13:17 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 02 Jul 2025 08:13:17 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1030385.1404060 (Exim 4.92) (envelope-from ) id 1uWsaj-0000qo-Pz; Wed, 02 Jul 2025 08:13:17 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1030385.1404060; 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bh=LGW/gk3WVxXGF0g4wh7ZDjVSEfCjF8UjuqgxFwW7rBU=; b=MJBVpMHqpu8cKkaJ8YCM1wr0ucHaY7HYgMgsIa83rTqGBYW/FoUvfFctqetwUWONP3pjkk bv+HZOy5FbEORdnda8SPjQo2MMDc2RCX5TyGk9HYCDjXzfZmbYZIEi3diq412+wMu+lOE8 ADwLeEvdfTYG0kH7/q94Awh/lQ6phOs= Authentication-Results: smtp-out1.suse.de; dkim=pass header.d=suse.com header.s=susede1 header.b=MJBVpMHq DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751443994; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=LGW/gk3WVxXGF0g4wh7ZDjVSEfCjF8UjuqgxFwW7rBU=; b=MJBVpMHqpu8cKkaJ8YCM1wr0ucHaY7HYgMgsIa83rTqGBYW/FoUvfFctqetwUWONP3pjkk bv+HZOy5FbEORdnda8SPjQo2MMDc2RCX5TyGk9HYCDjXzfZmbYZIEi3diq412+wMu+lOE8 ADwLeEvdfTYG0kH7/q94Awh/lQ6phOs= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 03/19] mini-os: grants: support populated grant table at boot Date: Wed, 2 Jul 2025 10:12:38 +0200 Message-ID: <20250702081254.14383-4-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250702081254.14383-1-jgross@suse.com> References: <20250702081254.14383-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Queue-Id: 7222921189 X-Rspamd-Action: no action X-Spam-Flag: NO X-Spamd-Result: default: False [-3.01 / 50.00]; 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Support that by not adding populated grant entries to the list of free grant entries. Signed-off-by: Juergen Gross --- gnttab.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/gnttab.c b/gnttab.c index 8168ed5d..5b04ab01 100644 --- a/gnttab.c +++ b/gnttab.c @@ -183,11 +183,13 @@ init_gnttab(void) #ifdef GNT_DEBUG memset(inuse, 1, sizeof(inuse)); #endif - for (i = NR_RESERVED_ENTRIES; i < NR_GRANT_ENTRIES; i++) - put_free_entry(i); gnttab_table = arch_init_gnttab(NR_GRANT_FRAMES); printk("gnttab_table mapped at %p.\n", gnttab_table); + + for (i = NR_RESERVED_ENTRIES; i < NR_GRANT_ENTRIES; i++) + if (gnttab_table[i].flags == 0) + put_free_entry(i); } void -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Wed Jul 02 08:13:28 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 02 Jul 2025 08:13:28 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1030404.1404083 (Exim 4.92) (envelope-from ) id 1uWsau-0001to-EN; Wed, 02 Jul 2025 08:13:28 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1030404.1404083; 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Wed, 2 Jul 2025 08:13:25 +0000 (UTC) Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 69C9113A24; Wed, 2 Jul 2025 08:13:25 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id LYdUGCXqZGgXSQAAD6G6ig (envelope-from ); Wed, 02 Jul 2025 08:13:25 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: 6d98b97b-571c-11f0-a313-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444005; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=iaDK/56bpA9CrTIegS7gZq6xQHIKshW7HV6CJUhUJck=; b=tR91GiVHHAu6qqBoWTtImiOznLtrDZYh8j3vk+SCrlAHTtoR/OLC6w84DHKi++8OIePwru D2uhZdHJLyRfYxGhKYYFL03+ie4Ztd3WGYT/L33XA1y6jl3odQAU57R3PrRHrTfuawt5y4 qeUgiaP1qq+hbkgA1rE4rkoZaGvjmrM= Authentication-Results: smtp-out2.suse.de; dkim=pass header.d=suse.com header.s=susede1 header.b=tR91GiVH DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444005; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=iaDK/56bpA9CrTIegS7gZq6xQHIKshW7HV6CJUhUJck=; b=tR91GiVHHAu6qqBoWTtImiOznLtrDZYh8j3vk+SCrlAHTtoR/OLC6w84DHKi++8OIePwru D2uhZdHJLyRfYxGhKYYFL03+ie4Ztd3WGYT/L33XA1y6jl3odQAU57R3PrRHrTfuawt5y4 qeUgiaP1qq+hbkgA1rE4rkoZaGvjmrM= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 05/19] mm: refactor init_page_allocator() Date: Wed, 2 Jul 2025 10:12:40 +0200 Message-ID: <20250702081254.14383-6-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250702081254.14383-1-jgross@suse.com> References: <20250702081254.14383-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Queue-Id: 92FC91F455 X-Rspamd-Action: no action X-Spam-Flag: NO X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; TO_DN_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RCVD_COUNT_TWO(0.00)[2]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:mid,suse.com:dkim,suse.com:email,imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo]; RCVD_TLS_ALL(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:106:10:150:64:167:received,2a07:de40:b281:104:10:150:64:97:from]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; RCPT_COUNT_THREE(0.00)[4]; DKIM_TRACE(0.00)[suse.com:+] X-Spam-Score: -3.01 X-Spam-Level: Split init_page_allocator() into three functions in order to prepare for sparing some memory from being added to the buddy allocator. Use a function pointer for selecting the function used for handling a memory range, as this will be needed by a future patch. For the same reason make iterate_memory_range() globally visible. Signed-off-by: Juergen Gross --- include/mm.h | 3 ++ mm.c | 111 +++++++++++++++++++++++++++++---------------------- 2 files changed, 66 insertions(+), 48 deletions(-) diff --git a/include/mm.h b/include/mm.h index 0a16d56c..1dc89ddb 100644 --- a/include/mm.h +++ b/include/mm.h @@ -95,4 +95,7 @@ void fini_mm(void); void change_readonly(bool readonly); +void iterate_memory_range(unsigned long min, unsigned long max, + void (*func)(unsigned long, unsigned long)); + #endif /* _MM_H_ */ diff --git a/mm.c b/mm.c index 9236db58..858dc108 100644 --- a/mm.c +++ b/mm.c @@ -150,16 +150,74 @@ static void dequeue_elem(chunk_head_t *elem) elem->next->prev = elem->prev; } +static void add_memory_range(unsigned long r_min, unsigned long r_max) +{ + unsigned int i; + unsigned long range; + chunk_head_t *ch; + + printk(" Adding memory range %lx-%lx\n", r_min, r_max); + + /* The buddy lists are addressed in high memory. */ + r_min = (unsigned long)to_virt(r_min); + r_max = (unsigned long)to_virt(r_max); + range = r_max - r_min; + + /* Free up the memory we've been given to play with. */ + map_free(PHYS_PFN(r_min), range >> PAGE_SHIFT); + + while ( range != 0 ) + { + /* + * Next chunk is limited by alignment of min, but also + * must not be bigger than remaining range. + */ + for ( i = PAGE_SHIFT; (1UL << (i + 1)) <= range; i++ ) + { + if ( r_min & (1UL << i) ) + break; + } + + ch = (chunk_head_t *)r_min; + r_min += 1UL << i; + range -= 1UL << i; + enqueue_elem(ch, i - PAGE_SHIFT); + } +} + +void iterate_memory_range(unsigned long min, unsigned long max, + void (*func)(unsigned long, unsigned long)) +{ + unsigned int m; + unsigned long r_min, r_max; + + for ( m = 0; m < e820_entries; m++ ) + { + if ( e820_map[m].type != E820_RAM ) + continue; + if ( e820_map[m].addr + e820_map[m].size >= ULONG_MAX ) + BUG(); + + r_min = e820_map[m].addr; + r_max = r_min + e820_map[m].size; + if ( r_max <= min || r_min >= max ) + continue; + if ( r_min < min ) + r_min = min; + if ( r_max > max ) + r_max = max; + + func(r_min, r_max); + } +} + /* * Initialise allocator, placing addresses [@min,@max] in free pool. * @min and @max are PHYSICAL addresses. */ static void init_page_allocator(unsigned long min, unsigned long max) { - int i, m; - unsigned long range; - unsigned long r_min, r_max; - chunk_head_t *ch; + int i; printk("MM: Initialise page allocator for %lx(%lx)-%lx(%lx)\n", (u_long)to_virt(min), min, (u_long)to_virt(max), max); @@ -182,50 +240,7 @@ static void init_page_allocator(unsigned long min, unsigned long max) /* All allocated by default. */ memset(mm_alloc_bitmap, ~0, mm_alloc_bitmap_size); - for ( m = 0; m < e820_entries; m++ ) - { - if ( e820_map[m].type != E820_RAM ) - continue; - if ( e820_map[m].addr + e820_map[m].size >= ULONG_MAX ) - BUG(); - - r_min = e820_map[m].addr; - r_max = r_min + e820_map[m].size; - if ( r_max <= min || r_min >= max ) - continue; - if ( r_min < min ) - r_min = min; - if ( r_max > max ) - r_max = max; - - printk(" Adding memory range %lx-%lx\n", r_min, r_max); 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Signed-off-by: Juergen Gross --- arch/x86/time.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/x86/time.c b/arch/x86/time.c index 52916e15..3a2a1d29 100644 --- a/arch/x86/time.c +++ b/arch/x86/time.c @@ -36,6 +36,7 @@ #include #include #include +#include #include #include @@ -193,3 +194,16 @@ void fini_time(void) HYPERVISOR_set_timer_op(0); unbind_evtchn(port); } + +#ifdef CONFIG_KEXEC +static int unbind_virq_timer(bool undo) +{ + if ( undo ) + init_time(); + else + fini_time(); + + return 0; +} +kexec_call(unbind_virq_timer); +#endif -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Wed Jul 02 08:20:44 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 02 Jul 2025 08:20:44 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1030436.1404118 (Exim 4.92) (envelope-from ) id 1uWshw-0004Wx-BM; Wed, 02 Jul 2025 08:20:44 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1030436.1404118; 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Wed, 2 Jul 2025 08:13:53 +0000 (UTC) Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 46F0C13A24; Wed, 2 Jul 2025 08:13:53 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id Yj32D0HqZGhSSQAAD6G6ig (envelope-from ); Wed, 02 Jul 2025 08:13:53 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: 7e2e27c7-571c-11f0-b894-0df219b8e170 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444033; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=s/i8n5z/NUez13m+U8EQbdRMUJ37I2u8cMr138p+cB8=; b=aioiIU2BAhP98zrkqlWpEjTluzk9qUbZo3IbIMGOa5Bjjzr3rN97rZdwC58T3r3cfSAxLq NynNOR6iugpm0TAYGCc9rsl9+DPsTX4Y4W/tylV5KE6I9Tq1RAE7UndgNU281iuRS1nmZw jY5fpRckGvmJwo+y+Z7hZtR42t41A/c= Authentication-Results: smtp-out2.suse.de; dkim=pass header.d=suse.com header.s=susede1 header.b=aioiIU2B DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444033; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=s/i8n5z/NUez13m+U8EQbdRMUJ37I2u8cMr138p+cB8=; b=aioiIU2BAhP98zrkqlWpEjTluzk9qUbZo3IbIMGOa5Bjjzr3rN97rZdwC58T3r3cfSAxLq NynNOR6iugpm0TAYGCc9rsl9+DPsTX4Y4W/tylV5KE6I9Tq1RAE7UndgNU281iuRS1nmZw jY5fpRckGvmJwo+y+Z7hZtR42t41A/c= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 10/19] e820: use special type for software reserved memory Date: Wed, 2 Jul 2025 10:12:45 +0200 Message-ID: <20250702081254.14383-11-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250702081254.14383-1-jgross@suse.com> References: <20250702081254.14383-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-3.01 / 50.00]; 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This is causing problems with kexec, as the new kernel should not see those areas in the memory map. Unfortunately the sequence of actions for calculating the size of the memory map and the removal of those reserved areas can't easily be adjusted to do the removal first, so another way must be used to avoid passing those reserved areas to the new kernel. Instead of using the type E820_RESERVED, which might be used for other pages as well, just use a new type. Areas with that new type can easily be filtered out when building the memory map for the new kernel. Introduce the type E820_TYPE_SOFT_RESERVED with the same value as the Linux kernel is using for the same purpose. Signed-off-by: Juergen Gross --- arch/x86/kexec.c | 4 +++- e820.c | 8 ++++---- include/e820.h | 2 ++ 3 files changed, 9 insertions(+), 5 deletions(-) diff --git a/arch/x86/kexec.c b/arch/x86/kexec.c index 3e3b64e2..804e7b6d 100644 --- a/arch/x86/kexec.c +++ b/arch/x86/kexec.c @@ -240,14 +240,16 @@ int kexec_get_entry(const char *cmdline) mmap = next; info->memmap_paddr = kexec_param_loc + (unsigned long)next - kexec_param_mem; - info->memmap_entries = e820_entries; for ( i = 0; i < e820_entries; i++ ) { + if ( e820_map[i].type == E820_TYPE_SOFT_RESERVED ) + continue; mmap->addr = e820_map[i].addr; mmap->size = e820_map[i].size; mmap->type = e820_map[i].type; mmap++; } + info->memmap_entries = mmap - (struct hvm_memmap_table_entry *)next; next = mmap; info->cmdline_paddr = kexec_param_loc + (unsigned long)next - kexec_param_mem; diff --git a/e820.c b/e820.c index 876d55b1..d8cfb1f4 100644 --- a/e820.c +++ b/e820.c @@ -367,8 +367,8 @@ unsigned long e820_get_reserved_pfns(int pages) for ( i = 0; i < e820_entries && e820_map[i].addr < last + needed; i++ ) last = e820_map[i].addr + e820_map[i].size; - if ( i == 0 || e820_map[i - 1].type != E820_RESERVED ) - e820_insert_entry_at(i, last, needed, E820_RESERVED); + if ( i == 0 || e820_map[i - 1].type != E820_TYPE_SOFT_RESERVED ) + e820_insert_entry_at(i, last, needed, E820_TYPE_SOFT_RESERVED); else e820_map[i - 1].size += needed; @@ -385,7 +385,7 @@ void e820_put_reserved_pfns(unsigned long start_pfn, int pages) i < e820_entries && addr >= e820_map[i].addr + e820_map[i].size; i++ ); - BUG_ON(i == e820_entries || e820_map[i].type != E820_RESERVED || + BUG_ON(i == e820_entries || e820_map[i].type != E820_TYPE_SOFT_RESERVED || addr + size > e820_map[i].addr + e820_map[i].size); if ( addr == e820_map[i].addr ) @@ -405,7 +405,7 @@ void e820_put_reserved_pfns(unsigned long start_pfn, int pages) e820_insert_entry_at(i + 1, addr + size, e820_map[i].addr + e820_map[i].size - addr - size, - E820_RESERVED); + E820_TYPE_SOFT_RESERVED); e820_map[i].size = addr - e820_map[i].addr; } #endif diff --git a/include/e820.h b/include/e820.h index ffa15aa9..ad5657ff 100644 --- a/include/e820.h +++ b/include/e820.h @@ -39,6 +39,8 @@ #define E820_DISABLED 6 #define E820_PMEM 7 #define E820_TYPES 8 +/* Memory reserved for Mini-OS internal purpose. */ +#define E820_TYPE_SOFT_RESERVED 0xefffffff struct __packed e820entry { uint64_t addr; -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Wed Jul 02 08:20:45 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 02 Jul 2025 08:20:45 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1030438.1404131 (Exim 4.92) (envelope-from ) id 1uWshw-0004e1-W5; Wed, 02 Jul 2025 08:20:44 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1030438.1404131; Wed, 02 Jul 2025 08:20:44 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uWshw-0004bc-GT; 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Signed-off-by: Juergen Gross --- Config.mk | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/Config.mk b/Config.mk index e2afb1b4..b9675e61 100644 --- a/Config.mk +++ b/Config.mk @@ -178,6 +178,7 @@ endif # CONFIG-y contains all items defaulting to "y" # CONFIG-n contains all items defaulting to "n" # CONFIG-x contains all items being calculated if not set explicitly +# CONFIG-val-y contains all items with numerical values, defaulting to 0 CONFIG-y += CONFIG_START_NETWORK CONFIG-y += CONFIG_SPARSE_BSS CONFIG-y += CONFIG_BLKFRONT @@ -219,6 +220,8 @@ CONFIG-$(lwip) += CONFIG_LWIP $(foreach i,$(CONFIG-y),$(eval $(i) ?= y)) $(foreach i,$(CONFIG-n),$(eval $(i) ?= n)) +$(foreach i,$(CONFIG-val-y),$(eval $(i) ?= 0)) + CONFIG-x += CONFIG_LIBXS CONFIG_LIBXS ?= $(CONFIG_XENBUS) @@ -226,6 +229,7 @@ CONFIG-all := $(CONFIG-y) $(CONFIG-n) $(CONFIG-x) # Export config items as compiler directives $(foreach i,$(CONFIG-all),$(eval DEFINES-$($(i)) += -D$(i))) +$(foreach i,$(CONFIG-val-y),$(eval DEFINES-y += -D$(i)=$($(i)))) DEFINES-y += -D__XEN_INTERFACE_VERSION__=$(XEN_INTERFACE_VERSION) -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Wed Jul 02 08:20:45 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 02 Jul 2025 08:20:45 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1030439.1404144 (Exim 4.92) (envelope-from ) id 1uWshx-00055Q-R8; 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bh=rhVOHkoDR7DK9kEudYFjk42y/LOmgxRrKdj918bopVw=; b=jkRNzMt28TxzuaBTSnR9Rmo5R+TMVmodcG8ICyYB0Zk1UOOZS07w1YMSKguZS3jt7XKZ66 JOIgH69IQl+osp7N3qYtGrcIPwIzb+1+VMEuRzHHCM983bpGMjP6/PRi+/+s58tnGQRN9I A46c8DJtfGZyYdvG9oeareiQW3a9qco= Authentication-Results: smtp-out2.suse.de; dkim=pass header.d=suse.com header.s=susede1 header.b=jkRNzMt2 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444044; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=rhVOHkoDR7DK9kEudYFjk42y/LOmgxRrKdj918bopVw=; b=jkRNzMt28TxzuaBTSnR9Rmo5R+TMVmodcG8ICyYB0Zk1UOOZS07w1YMSKguZS3jt7XKZ66 JOIgH69IQl+osp7N3qYtGrcIPwIzb+1+VMEuRzHHCM983bpGMjP6/PRi+/+s58tnGQRN9I A46c8DJtfGZyYdvG9oeareiQW3a9qco= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 12/19] mini-os: kexec: add support for handing over some memory across kexec Date: Wed, 2 Jul 2025 10:12:47 +0200 Message-ID: <20250702081254.14383-13-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250702081254.14383-1-jgross@suse.com> References: <20250702081254.14383-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Queue-Id: 8CB271F445 X-Rspamd-Action: no action X-Spam-Flag: NO X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; TO_DN_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RCVD_COUNT_TWO(0.00)[2]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:mid,suse.com:dkim,suse.com:email,imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo]; RCVD_TLS_ALL(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:104:10:150:64:97:from,2a07:de40:b281:106:10:150:64:167:received]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; RCPT_COUNT_THREE(0.00)[4]; DKIM_TRACE(0.00)[suse.com:+] X-Spam-Score: -3.01 X-Spam-Level: Especially for support of Xenstore-stubdom live update some memory must be handed over to the new kernel without moving it around: as the 9pfs device used for storing and retrieving the state of Xenstore needs to be kept operational across kexec (it can't be reopened due to Xenstore not being available without access to the device), the ring pages need to be accessible via active grants by the backend all the time. Add the basic support for that by reserving a pre-defined number of memory pages at the top of the memory. This memory area will be handed over to the new kernel via specifying it as a module in struct hvm_start_info. The contents of the memory area are described via a generic table of contents in the last page of the memory. Signed-off-by: Juergen Gross --- Config.mk | 2 ++ arch/x86/kexec.c | 77 +++++++++++++++++++++++++++++++++++++++++++ arch/x86/mm.c | 18 ++++++++++ arch/x86/setup.c | 28 ++++++++++++++++ include/kernel.h | 1 + include/kexec.h | 45 +++++++++++++++++++++++++ include/x86/arch_mm.h | 1 + kexec.c | 3 ++ mm.c | 6 ++++ 9 files changed, 181 insertions(+) diff --git a/Config.mk b/Config.mk index b9675e61..0e4e86d8 100644 --- a/Config.mk +++ b/Config.mk @@ -220,6 +220,8 @@ CONFIG-$(lwip) += CONFIG_LWIP $(foreach i,$(CONFIG-y),$(eval $(i) ?= y)) $(foreach i,$(CONFIG-n),$(eval $(i) ?= n)) +CONFIG-val-$(CONFIG_KEXEC) += CONFIG_KEXEC_MODULE_PAGES + $(foreach i,$(CONFIG-val-y),$(eval $(i) ?= 0)) CONFIG-x += CONFIG_LIBXS diff --git a/arch/x86/kexec.c b/arch/x86/kexec.c index 804e7b6d..7fb98473 100644 --- a/arch/x86/kexec.c +++ b/arch/x86/kexec.c @@ -201,10 +201,73 @@ static unsigned long kexec_param_loc; static unsigned int kexec_param_size; static unsigned long kexec_param_mem; +static struct kexec_module *kexec_check_module(void) +{ + unsigned long mod_size; + unsigned long mod; + struct kexec_module *module_ptr; + + mod = get_module(&mod_size); + if ( !mod ) + return NULL; + /* Size must be a multiple of PAGE_SIZE. */ + if ( mod_size & ~PAGE_MASK ) + return NULL; + + /* Kxec module description is at start of the last page of the module. */ + module_ptr = (void *)(mod + mod_size - (unsigned long)PAGE_SIZE); + + /* Check eye catcher. */ + if ( memcmp(module_ptr->eye_catcher, KEXECMOD_EYECATCHER, + sizeof(module_ptr->eye_catcher)) ) + return NULL; + if ( module_ptr->n_pages != (mod_size >> PAGE_SHIFT) - 1 ) + return NULL; + + return module_ptr; +} + +static void get_mod_addr(unsigned long from, unsigned long to) +{ + unsigned long size = PFN_PHYS(CONFIG_KEXEC_MODULE_PAGES); + + if ( to - from >= size && to - size > kexec_mod_start ) + kexec_mod_start = to - size; +} + +#define min(a, b) ((a) < (b) ? (a) : (b)) +void kexec_module(unsigned long start_pfn, unsigned long max_pfn) +{ + /* Reuse already existing kexec module. */ + mod_ptr = kexec_check_module(); + if ( !mod_ptr && CONFIG_KEXEC_MODULE_PAGES ) + { + max_pfn = min(max_pfn, PHYS_PFN(0xffffffff)); + + iterate_memory_range(PFN_PHYS(start_pfn), PFN_PHYS(max_pfn), + get_mod_addr); + BUG_ON(!kexec_mod_start); + + mod_ptr = (void *)(kexec_mod_start + + ((CONFIG_KEXEC_MODULE_PAGES - 1) << PAGE_SHIFT)); + memset(mod_ptr, 0, PAGE_SIZE); + memcpy(mod_ptr->eye_catcher, KEXECMOD_EYECATCHER, + sizeof(mod_ptr->eye_catcher)); + mod_ptr->n_pages = CONFIG_KEXEC_MODULE_PAGES - 1; + memset(mod_ptr->pg2rec, KEXECMOD_PG_FREE, mod_ptr->n_pages); + mod_ptr->recs_off = sizeof(struct kexec_module) + + CONFIG_KEXEC_MODULE_PAGES + (mod_ptr->n_pages & 1); + + set_reserved_range(kexec_mod_start, (unsigned long)mod_ptr + PAGE_SIZE); + } +} + void kexec_set_param_loc(const char *cmdline) { kexec_param_size = sizeof(struct hvm_start_info); kexec_param_size += e820_entries * sizeof(struct hvm_memmap_table_entry); + if ( mod_ptr ) + kexec_param_size += sizeof(struct hvm_modlist_entry); kexec_param_size += strlen(cmdline) + 1; kexec_last_addr = (kexec_last_addr + 7) & ~7UL; @@ -218,6 +281,7 @@ int kexec_get_entry(const char *cmdline) void *next; struct hvm_start_info *info; struct hvm_memmap_table_entry *mmap; + struct hvm_modlist_entry *mod; unsigned int order; unsigned int i; @@ -252,6 +316,19 @@ int kexec_get_entry(const char *cmdline) info->memmap_entries = mmap - (struct hvm_memmap_table_entry *)next; next = mmap; + if ( mod_ptr ) + { + mod = next; + memset(mod, 0, sizeof(*mod)); + info->nr_modules = 1; + info->modlist_paddr = kexec_param_loc + + (unsigned long)next - kexec_param_mem; + mod->paddr = kexec_mod_start; + mod->size = PFN_PHYS(mod_ptr->n_pages + 1); + mod->cmdline_paddr = 0; + next = mod + 1; + } + info->cmdline_paddr = kexec_param_loc + (unsigned long)next - kexec_param_mem; strcpy(next, cmdline); diff --git a/arch/x86/mm.c b/arch/x86/mm.c index 7c3c83be..bdff38fd 100644 --- a/arch/x86/mm.c +++ b/arch/x86/mm.c @@ -151,6 +151,24 @@ static struct { unsigned long size; } reserved_range[MAX_RSV_RANGES]; +void set_reserved_range(unsigned long start, unsigned long end) +{ + unsigned int i; + + for ( i = 0; i < MAX_RSV_RANGES; i++ ) + { + if ( reserved_range[i].size ) + continue; + + reserved_range[i].start = start; + reserved_range[i].size = end - start; + + return; + } + + BUG(); +} + void check_memory_range(unsigned long *from, unsigned long *to) { unsigned int m; diff --git a/arch/x86/setup.c b/arch/x86/setup.c index 2085ee5c..299ff8c7 100644 --- a/arch/x86/setup.c +++ b/arch/x86/setup.c @@ -127,6 +127,13 @@ static void print_start_of_day(void *p) printk(" cmd_line: %s\n", cmdline); printk(" stack: %p-%p\n", stack, stack + sizeof(stack)); } + +unsigned long get_module(unsigned long *size) +{ + *size = start_info_ptr->mod_len; + + return start_info_ptr->mod_start; +} #else /* @@ -182,6 +189,27 @@ static void print_start_of_day(void *p) printk(" stack: %p-%p\n", stack, stack + sizeof(stack)); arch_print_memmap(); } + +unsigned long get_module(unsigned long *size) +{ + struct hvm_modlist_entry *mod; + + if ( !hvm_start_info_ptr->nr_modules ) + return 0; + + if ( hvm_start_info_ptr->nr_modules > 1 ) + { + printk("get_module() called with more than 1 module present\n"); + printk("First module data returned\n"); + } + + mod = (struct hvm_modlist_entry *)(unsigned long) + hvm_start_info_ptr->modlist_paddr; + + *size = mod->size; + + return mod->paddr; +} #endif /* diff --git a/include/kernel.h b/include/kernel.h index 161d7571..e11b04cf 100644 --- a/include/kernel.h +++ b/include/kernel.h @@ -10,5 +10,6 @@ void post_suspend(int canceled); void do_exit(void) __attribute__((noreturn)); void arch_do_exit(void); void stop_kernel(void); +unsigned long get_module(unsigned long *size); #endif /* _KERNEL_H_ */ diff --git a/include/kexec.h b/include/kexec.h index b89c3000..0200005f 100644 --- a/include/kexec.h +++ b/include/kexec.h @@ -2,6 +2,48 @@ #define _KEXEC_H #include +/* + * Kexec module used to hand over memory across kexec(). + * + * This is an ABI which should be modified only in a compatible way. + * struct kexec_module is located at the start of the last page of the module. + * + * The module can contain data/pages of multiple users. Each user has an own + * record which layout is depending on the user. Records are linked via a table + * of record offsets. + * + * All admin data (struct kexec_module, record offset table and records) must + * fit into the last page of the module. + */ +struct kexec_module { + uint8_t eye_catcher[8]; +#define KEXECMOD_EYECATCHER "KexecMem" + uint16_t n_pages; /* Number of allocatable pages in the module. */ + uint16_t n_records; /* Size of record table (max. 255). */ +#define KEXECMOD_REC_MAX 255 + uint16_t recs_off; /* Offset to record table from start of page. */ + /* The record table is an array of */ + /* struct kexec_module_rec. */ + uint8_t pg2rec[]; /* One entry per allocatable module page, value */ + /* is record number (starting from 0) associated */ + /* with it. Free pages have value 255. */ +#define KEXECMOD_PG_FREE 255 +}; + +struct kexec_module_rec { + uint16_t offset; /* Offset to record from start of page. */ + uint8_t type; /* Type of record. */ +#define KEXECMOD_REC_NONE 0 + uint8_t size; /* Size of record. */ +}; + +#ifndef CONFIG_KEXEC_MODULE_PAGES +#define CONFIG_KEXEC_MODULE_PAGES 0 +#endif + +extern unsigned long kexec_mod_start; +extern struct kexec_module *mod_ptr; + /* One element of kexec actions (last element must have action KEXEC_CALL): */ struct kexec_action { enum { @@ -60,4 +102,7 @@ int kexec_move_used_pages(unsigned long boundary, unsigned long kernel, unsigned long kernel_size); void kexec_move_used_pages_undo(void); +/* Check for kexec module and create kexec memory if needed. */ +void kexec_module(unsigned long start_pfn, unsigned long max_pfn); + #endif /* _KEXEC_H */ diff --git a/include/x86/arch_mm.h b/include/x86/arch_mm.h index a1b975dc..ae56781e 100644 --- a/include/x86/arch_mm.h +++ b/include/x86/arch_mm.h @@ -289,6 +289,7 @@ unsigned long alloc_virt_kernel(unsigned n_pages); void arch_mm_pre_suspend(void); void arch_mm_post_suspend(int canceled); +void set_reserved_range(unsigned long start, unsigned long end); #ifndef CONFIG_PARAVIRT void arch_print_memmap(void); diff --git a/kexec.c b/kexec.c index 2607c819..ded29882 100644 --- a/kexec.c +++ b/kexec.c @@ -250,3 +250,6 @@ int kexec_add_action(int action, void *dest, void *src, unsigned int len) return 0; } + +unsigned long kexec_mod_start; +struct kexec_module *mod_ptr; diff --git a/mm.c b/mm.c index 8c41d2f2..b5e8d801 100644 --- a/mm.c +++ b/mm.c @@ -44,6 +44,7 @@ #include #include #include +#include /* * ALLOCATION BITMAP @@ -503,6 +504,11 @@ void init_mm(void) arch_init_mm(&start_pfn, &max_pfn); get_max_pages(); +#ifdef CONFIG_KEXEC + /* To be called after arch_init_mm() and before init_page_allocator(). */ + kexec_module(start_pfn, max_pfn); +#endif + /* Now we can initialise the page allocator. */ init_page_allocator(PFN_PHYS(start_pfn), PFN_PHYS(max_pfn)); printk("MM: done\n"); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Wed Jul 02 08:20:52 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 02 Jul 2025 08:20:52 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1030450.1404177 (Exim 4.92) (envelope-from ) id 1uWsi4-00064H-9H; 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bh=ubR6pSt9182ihX0qStfZwbGBhcxTfFCMnfWKOJagOwc=; b=gXY91VIAg53p7prR25YIH3AJCIjf7Q9ImmgpAbo6e3BXm1x2tPRztRcv2BuDLdWWvaD8r3 vRhKqtTMQCBvpGSYjadSVC1iHhovqQGBjjwd5U0QhdQpeFijJSUvyh+qY7l/fc04kT9/qW M5nUHGuy+FiJDG294Ydy2b9egOdbDoc= Authentication-Results: smtp-out2.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444061; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ubR6pSt9182ihX0qStfZwbGBhcxTfFCMnfWKOJagOwc=; b=gXY91VIAg53p7prR25YIH3AJCIjf7Q9ImmgpAbo6e3BXm1x2tPRztRcv2BuDLdWWvaD8r3 vRhKqtTMQCBvpGSYjadSVC1iHhovqQGBjjwd5U0QhdQpeFijJSUvyh+qY7l/fc04kT9/qW M5nUHGuy+FiJDG294Ydy2b9egOdbDoc= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 15/19] 9pfs: refactor init_9pfront() Date: Wed, 2 Jul 2025 10:12:50 +0200 Message-ID: <20250702081254.14383-16-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250702081254.14383-1-jgross@suse.com> References: <20250702081254.14383-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Flag: NO X-Spam-Score: -2.80 X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:mid,suse.com:email,imap1.dmz-prg2.suse.org:helo]; RCVD_TLS_ALL(0.00)[] X-Spam-Level: Move the Xenstore and backend interface related handling into a sub-function in order to prepare supporting reconnecting to an active 9pfs device after kexec. Signed-off-by: Juergen Gross --- 9pfront.c | 136 ++++++++++++++++++++++++++++++++++-------------------- 1 file changed, 86 insertions(+), 50 deletions(-) diff --git a/9pfront.c b/9pfront.c index 2bfc49b1..8da2f726 100644 --- a/9pfront.c +++ b/9pfront.c @@ -1097,68 +1097,65 @@ static void free_9pfront(struct dev_9pfs *dev) free(dev); } -void *init_9pfront(unsigned int id, const char *mnt) +static bool issue_err(struct dev_9pfs *dev, char *msg, char *reason) +{ + if ( msg ) + { + printk("9pfsfront add %u failed, error %s accessing Xenstore\n", + dev->id, msg); + free(msg); + } + else + printk("9pfsfront add %u failed, %s\n", dev->id, reason); + + return false; +} + +static bool read_config_xs(struct dev_9pfs *dev) { - struct dev_9pfs *dev; char *msg; char *reason = ""; - xenbus_transaction_t xbt; - int retry = 1; XenbusState state; - unsigned int i; - void *addr; + xenbus_transaction_t xbt; char *version; char *v; - - printk("9pfsfront add %u, for mount at %s\n", id, mnt); - dev = malloc(sizeof(*dev)); - memset(dev, 0, sizeof(*dev)); - snprintf(dev->nodename, sizeof(dev->nodename), "device/9pfs/%u", id); - dev->id = id; - init_waitqueue_head(&dev->waitq); - init_SEMAPHORE(&dev->ring_out_sem, 1); - init_SEMAPHORE(&dev->ring_in_sem, 1); - dev->fid_mask = ~0ULL; - - for ( i = 0; i < N_REQS; i++ ) - { - dev->req[i].id = i; - dev->req[i].next_free = i + 1; - } - dev->free_reqs = 0; + void *addr; + unsigned int i; + int retry = 1; msg = xenbus_read_unsigned(XBT_NIL, dev->nodename, "backend-id", &dev->dom); if ( msg ) - goto err; + return issue_err(dev, msg, reason); msg = xenbus_read_string(XBT_NIL, dev->nodename, "backend", &dev->backend); if ( msg ) - goto err; + return issue_err(dev, msg, reason); msg = xenbus_read_string(XBT_NIL, dev->nodename, "tag", &dev->tag); if ( msg ) - goto err; + return issue_err(dev, msg, reason); snprintf(dev->bepath, sizeof(dev->bepath), "%s/state", dev->backend); free(xenbus_watch_path_token(XBT_NIL, dev->bepath, dev->bepath, &dev->events)); + state = xenbus_read_integer(dev->bepath); while ( msg == NULL && state < XenbusStateInitWait ) msg = xenbus_wait_for_state_change(dev->bepath, &state, &dev->events); if ( msg || state != XenbusStateInitWait ) { reason = "illegal backend state"; - goto err; + return issue_err(dev, msg, reason); } msg = xenbus_read_unsigned(XBT_NIL, dev->backend, "max-ring-page-order", &dev->ring_order); if ( msg ) - goto err; + return issue_err(dev, msg, reason); if ( dev->ring_order > DEFAULT_9PFS_RING_ORDER ) dev->ring_order = DEFAULT_9PFS_RING_ORDER; msg = xenbus_read_string(XBT_NIL, dev->backend, "versions", &version); if ( msg ) - goto err; + return issue_err(dev, msg, reason); for ( v = version; *v; v++ ) { if ( strtoul(v, &v, 10) == 1 && (*v == ',' || *v == 0) ) @@ -1170,25 +1167,36 @@ void *init_9pfront(unsigned int id, const char *mnt) { reason = "backend published illegal version string"; free(version); - goto err; + return issue_err(dev, msg, reason); } } free(version); if ( v ) { reason = "backend doesn't support version 1"; - goto err; + return issue_err(dev, msg, reason); } - dev->ring_ref = gnttab_alloc_and_grant((void **)&dev->intf); + dev->intf = (void *)alloc_page(); + if ( !dev->intf ) + { + reason = "couldn't allocate shared interface page"; + return issue_err(dev, msg, reason); + } memset(dev->intf, 0, PAGE_SIZE); + dev->ring_ref = gnttab_grant_access(dev->dom, virt_to_mfn(dev->intf), 0); if ( evtchn_alloc_unbound(dev->dom, intr_9pfs, dev, &dev->evtchn) ) { reason = "no event channel"; - goto err; + return issue_err(dev, msg, reason); } dev->intf->ring_order = dev->ring_order; dev->data.in = (void *)alloc_pages(dev->ring_order); + if ( !dev->data.in ) + { + reason = "couldn't allocate ring pages"; + return issue_err(dev, msg, reason); + } dev->data.out = dev->data.in + XEN_FLEX_RING_SIZE(dev->ring_order); for ( i = 0; i < (1 << dev->ring_order); i++ ) { @@ -1204,30 +1212,35 @@ void *init_9pfront(unsigned int id, const char *mnt) free(msg); msg = NULL; reason = "starting transaction"; - goto err; + return issue_err(dev, msg, reason); } msg = xenbus_printf(xbt, dev->nodename, "version", "%u", 1); if ( msg ) - goto err_tr; + break; msg = xenbus_printf(xbt, dev->nodename, "num-rings", "%u", 1); if ( msg ) - goto err_tr; + break; msg = xenbus_printf(xbt, dev->nodename, "ring-ref0", "%u", dev->ring_ref); if ( msg ) - goto err_tr; + break; msg = xenbus_printf(xbt, dev->nodename, "event-channel-0", "%u", dev->evtchn); if ( msg ) - goto err_tr; + break; msg = xenbus_printf(xbt, dev->nodename, "state", "%u", XenbusStateInitialised); if ( msg ) - goto err_tr; + break; free(xenbus_transaction_end(xbt, 0, &retry)); } + if ( msg ) + { + free(xenbus_transaction_end(xbt, 1, &retry)); + return issue_err(dev, msg, reason); + } state = xenbus_read_integer(dev->bepath); while ( msg == NULL && state < XenbusStateConnected ) @@ -1235,13 +1248,42 @@ void *init_9pfront(unsigned int id, const char *mnt) if ( msg || state != XenbusStateConnected ) { reason = "illegal backend state"; - goto err; + return issue_err(dev, msg, reason); } msg = xenbus_printf(XBT_NIL, dev->nodename, "state", "%u", XenbusStateConnected); if ( msg ) - goto err; + return issue_err(dev, msg, reason); + + return true; +} + +void *init_9pfront(unsigned int id, const char *mnt) +{ + struct dev_9pfs *dev; + char *reason = ""; + unsigned int i; + + printk("9pfsfront add %u, for mount at %s\n", id, mnt); + dev = malloc(sizeof(*dev)); + memset(dev, 0, sizeof(*dev)); + snprintf(dev->nodename, sizeof(dev->nodename), "device/9pfs/%u", id); + dev->id = id; + init_waitqueue_head(&dev->waitq); + init_SEMAPHORE(&dev->ring_out_sem, 1); + init_SEMAPHORE(&dev->ring_in_sem, 1); + dev->fid_mask = ~0ULL; + + for ( i = 0; i < N_REQS; i++ ) + { + dev->req[i].id = i; + dev->req[i].next_free = i + 1; + } + dev->free_reqs = 0; + + if ( !read_config_xs(dev) ) + goto err_out; unmask_evtchn(dev->evtchn); @@ -1260,17 +1302,11 @@ void *init_9pfront(unsigned int id, const char *mnt) return dev; - err_tr: - free(xenbus_transaction_end(xbt, 1, &retry)); - err: - if ( msg ) - printk("9pfsfront add %u failed, error %s accessing Xenstore\n", - id, msg); - else - printk("9pfsfront add %u failed, %s\n", id, reason); + printk("9pfsfront add %u failed, %s\n", id, reason); + + err_out: free_9pfront(dev); - free(msg); return NULL; } EXPORT_SYMBOL(init_9pfront); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Wed Jul 02 08:20:55 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 02 Jul 2025 08:20:55 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1030458.1404197 (Exim 4.92) (envelope-from ) id 1uWsi7-0006sX-8C; Wed, 02 Jul 2025 08:20:55 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1030458.1404197; Wed, 02 Jul 2025 08:20:55 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uWsi7-0006s3-4E; Wed, 02 Jul 2025 08:20:55 +0000 Received: by outflank-mailman (input) for mailman id 1030458; Wed, 02 Jul 2025 08:20:54 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uWsbA-00082X-8A for minios-devel@lists.xenproject.org; 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Wed, 02 Jul 2025 08:13:42 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: 778a3c73-571c-11f0-b894-0df219b8e170 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444022; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=VFGHThmdUPo7tU8/k1YjcPPbr+K+PG8BXx4fi06T8E8=; b=tdvNwrFuYC25cBlRD2W9UnU/lW5P7VQOwsNG3RMXt5GAkHq4KsaTh8t4Tm8OjWNrCXtP68 wWviHOIYRdYnF9OwQae4h0xzvHas6e+ULLL7ydMrQ4l67cBwL4WFfDUUWfw0X1D8yGsriI hPYonJ1fCz/VEjm2DyxFqKDlVSTC5eA= Authentication-Results: smtp-out2.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444022; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=VFGHThmdUPo7tU8/k1YjcPPbr+K+PG8BXx4fi06T8E8=; b=tdvNwrFuYC25cBlRD2W9UnU/lW5P7VQOwsNG3RMXt5GAkHq4KsaTh8t4Tm8OjWNrCXtP68 wWviHOIYRdYnF9OwQae4h0xzvHas6e+ULLL7ydMrQ4l67cBwL4WFfDUUWfw0X1D8yGsriI hPYonJ1fCz/VEjm2DyxFqKDlVSTC5eA= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 08/19] e820: don't count lapic page as initially reserved Date: Wed, 2 Jul 2025 10:12:43 +0200 Message-ID: <20250702081254.14383-9-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250702081254.14383-1-jgross@suse.com> References: <20250702081254.14383-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Flag: NO X-Spam-Score: -2.80 X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:mid,suse.com:email,imap1.dmz-prg2.suse.org:helo]; RCVD_TLS_ALL(0.00)[] X-Spam-Level: The number of pages marked initially as reserved in the memory map are counted to be allocated, as they are normally populated by Xen tools for e.g. xenbus and console ring pages. This is wrong in case the lapic page is marked as reserved in the memory map, as there is never memory allocated for a lapic. So when finding the lapic page to be marked as reserved, don't add it to the number of reserved pages. Fixes: 9b87429d2864 ("mini-os: fix number of pages for PVH") Signed-off-by: Juergen Gross --- e820.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/e820.c b/e820.c index 49b16878..876d55b1 100644 --- a/e820.c +++ b/e820.c @@ -275,7 +275,10 @@ static void e820_sanitize(void) e820_initial_reserved_pfns += e820_map[i].size / PAGE_SIZE; if ( e820_map[i].addr <= LAPIC_ADDRESS && e820_map[i].addr + e820_map[i].size > LAPIC_ADDRESS ) + { found_lapic = true; + e820_initial_reserved_pfns--; + } } } -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Wed Jul 02 08:21:04 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 02 Jul 2025 08:21:04 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1030491.1404222 (Exim 4.92) (envelope-from ) id 1uWsiG-0008L8-9c; Wed, 02 Jul 2025 08:21:04 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1030491.1404222; Wed, 02 Jul 2025 08:21:04 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uWsiG-0008KK-41; Wed, 02 Jul 2025 08:21:04 +0000 Received: by outflank-mailman (input) for mailman id 1030491; Wed, 02 Jul 2025 08:21:02 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uWsbF-00082X-M9 for minios-devel@lists.xenproject.org; Wed, 02 Jul 2025 08:13:49 +0000 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.223.130]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 7adda828-571c-11f0-b894-0df219b8e170; Wed, 02 Jul 2025 10:13:48 +0200 (CEST) Received: from imap1.dmz-prg2.suse.org (unknown [10.150.64.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id DF39421182; Wed, 2 Jul 2025 08:13:47 +0000 (UTC) Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id B3D4113A54; Wed, 2 Jul 2025 08:13:47 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id BItmKjvqZGhJSQAAD6G6ig (envelope-from ); Wed, 02 Jul 2025 08:13:47 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: 7adda828-571c-11f0-b894-0df219b8e170 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444027; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=uwLSYgMVcboUpduICczAWr7hs1RsmqCqfe1jLSr8ytE=; b=r7oc77bfmJHkkSzUx4K3TRfIU50j9Jj7KAhiDiExMV+qTsjZIb6ZBdKjecTxEBC5V4fRFa ppqgKf36/Ya7m2NvY9rUe5fPaQ5RI892qfK78i4iQvgyq5sFCO3J/bhRll9izfEGLFHxfO 4R1OjJGloBjUZhJ4X4LDsxo5vpuFnhc= Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444027; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=uwLSYgMVcboUpduICczAWr7hs1RsmqCqfe1jLSr8ytE=; b=r7oc77bfmJHkkSzUx4K3TRfIU50j9Jj7KAhiDiExMV+qTsjZIb6ZBdKjecTxEBC5V4fRFa ppqgKf36/Ya7m2NvY9rUe5fPaQ5RI892qfK78i4iQvgyq5sFCO3J/bhRll9izfEGLFHxfO 4R1OjJGloBjUZhJ4X4LDsxo5vpuFnhc= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 09/19] kexec: restructure building the start info data Date: Wed, 2 Jul 2025 10:12:44 +0200 Message-ID: <20250702081254.14383-10-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250702081254.14383-1-jgross@suse.com> References: <20250702081254.14383-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Flag: NO X-Spam-Score: -2.80 X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:mid,suse.com:email,imap1.dmz-prg2.suse.org:helo]; RCVD_TLS_ALL(0.00)[] X-Spam-Level: Instead of setting most of the struct hvm_start_info fields first and then building the leaf data, restructure kexec_get_entry() by using an opaque "next" pointer where the next leaf data will be stored and handle that leaf data together with the associated hvm_start_info fields. This will make it easier to add new data items without having to rewrite large portions of the function. Signed-off-by: Juergen Gross --- arch/x86/kexec.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) diff --git a/arch/x86/kexec.c b/arch/x86/kexec.c index d84df42c..3e3b64e2 100644 --- a/arch/x86/kexec.c +++ b/arch/x86/kexec.c @@ -215,6 +215,7 @@ void kexec_set_param_loc(const char *cmdline) int kexec_get_entry(const char *cmdline) { + void *next; struct hvm_start_info *info; struct hvm_memmap_table_entry *mmap; unsigned int order; @@ -229,16 +230,17 @@ int kexec_get_entry(const char *cmdline) if ( !kexec_param_mem ) return ENOMEM; - info = (struct hvm_start_info *)kexec_param_mem; + next = (void *)kexec_param_mem; + + info = next; memset(info, 0, sizeof(*info)); info->magic = XEN_HVM_START_MAGIC_VALUE; info->version = 1; - info->cmdline_paddr = kexec_param_loc + sizeof(*info) + - e820_entries * sizeof(struct hvm_memmap_table_entry); - info->memmap_paddr = kexec_param_loc + sizeof(*info); - info->memmap_entries = e820_entries; + next = info + 1; - mmap = (struct hvm_memmap_table_entry *)(info + 1); + mmap = next; + info->memmap_paddr = kexec_param_loc + (unsigned long)next - kexec_param_mem; + info->memmap_entries = e820_entries; for ( i = 0; i < e820_entries; i++ ) { mmap->addr = e820_map[i].addr; @@ -246,8 +248,10 @@ int kexec_get_entry(const char *cmdline) mmap->type = e820_map[i].type; mmap++; } + next = mmap; - strcpy((char *)mmap, cmdline); + info->cmdline_paddr = kexec_param_loc + (unsigned long)next - kexec_param_mem; + strcpy(next, cmdline); if ( kexec_add_action(KEXEC_COPY, to_virt(kexec_param_loc), info, kexec_param_size) ) -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Wed Jul 02 08:21:09 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 02 Jul 2025 08:21:09 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1030509.1404237 (Exim 4.92) (envelope-from ) id 1uWsiL-0000uL-Rn; Wed, 02 Jul 2025 08:21:09 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1030509.1404237; 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Wed, 2 Jul 2025 08:13:31 +0000 (UTC) Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 135DA13A24; Wed, 2 Jul 2025 08:13:31 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id FoE4AyvqZGgfSQAAD6G6ig (envelope-from ); Wed, 02 Jul 2025 08:13:31 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: 71040eab-571c-11f0-a313-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444011; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=PqeT9QtIJE1Ok+fqszezjXe9WOy8z56eRXWRpRN0vUQ=; b=QrGGKNYL/DWVxxTQCLDbMmIH7WiOgWMb7tx1iOXOjolTiAiQlzDJxRfPweerBktWwhi3Nj Ihh1pzYSvqqSlsaH28aA0oOTozW+Y3GOnU7FG14JRopCWE1kJJpZ9oFZD4P42d+47l0TRi AOKexml5tJYNEP1+Q06QyXLtOnirIiA= Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444011; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=PqeT9QtIJE1Ok+fqszezjXe9WOy8z56eRXWRpRN0vUQ=; b=QrGGKNYL/DWVxxTQCLDbMmIH7WiOgWMb7tx1iOXOjolTiAiQlzDJxRfPweerBktWwhi3Nj Ihh1pzYSvqqSlsaH28aA0oOTozW+Y3GOnU7FG14JRopCWE1kJJpZ9oFZD4P42d+47l0TRi AOKexml5tJYNEP1+Q06QyXLtOnirIiA= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 06/19] mm: don't add module pages to free memory Date: Wed, 2 Jul 2025 10:12:41 +0200 Message-ID: <20250702081254.14383-7-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250702081254.14383-1-jgross@suse.com> References: <20250702081254.14383-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Flag: NO X-Spam-Score: -2.80 X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:mid,suse.com:email,imap1.dmz-prg2.suse.org:helo]; RCVD_TLS_ALL(0.00)[] X-Spam-Level: When initializing the memory allocator, don't add memory pages of modules and the initial boot info structure to the free memory. This is relevant only when running in PVH mode, as in PV mode only memory above the initial page tables is added to free memory, and the module and start_info pages are below the page tables. Signed-off-by: Juergen Gross --- arch/x86/mm.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++ include/mm.h | 1 + mm.c | 21 +++++++++++++- 3 files changed, 101 insertions(+), 1 deletion(-) diff --git a/arch/x86/mm.c b/arch/x86/mm.c index 26ede6f4..7c3c83be 100644 --- a/arch/x86/mm.c +++ b/arch/x86/mm.c @@ -78,6 +78,10 @@ void arch_mm_preinit(void *p) last_free_pfn = si->nr_pages; balloon_set_nr_pages(last_free_pfn, last_free_pfn); } + +void check_memory_range(unsigned long *from, unsigned long *to) +{ +} #else #include user_desc gdt[NR_GDT_ENTRIES] = @@ -125,6 +129,78 @@ void arch_mm_preinit(void *p) last_free_pfn = e820_get_maxpfn(pages); balloon_set_nr_pages(pages, last_free_pfn); } + +static void check_memory_range_conflict(unsigned long *from, unsigned long *to, + unsigned long chk, unsigned long sz) +{ + unsigned long chk_end = chk + sz; + + if ( *to <= chk || *from >= chk_end ) + return; + + if ( chk <= *from ) + *from = (chk_end >= *to) ? *to : chk_end; + else + *to = chk; +} + +/* Reserved memory ranges not added to free memory. */ +#define MAX_RSV_RANGES 1 +static struct { + unsigned long start; + unsigned long size; +} reserved_range[MAX_RSV_RANGES]; + +void check_memory_range(unsigned long *from, unsigned long *to) +{ + unsigned int m; + struct hvm_modlist_entry *mod; + + for ( m = 0; m < MAX_RSV_RANGES && reserved_range[m].size; m++ ) + check_memory_range_conflict(from, to, reserved_range[m].start, + reserved_range[m].size); + + mod = (struct hvm_modlist_entry *)(unsigned long) + hvm_start_info_ptr->modlist_paddr; + for ( m = 0; m < hvm_start_info_ptr->nr_modules; m++ ) + check_memory_range_conflict(from, to, mod[m].paddr, mod[m].size); +} + +#define max(a, b) ((a) < (b) ? (b) : (a)) + +static void pvh_reserve_start_info(unsigned long *start_pfn) +{ + unsigned long end = 0; + unsigned long start = (unsigned long)hvm_start_info_ptr; + unsigned long end_pfn; + unsigned int m; + struct hvm_modlist_entry *mod; + char *cmdline; + + mod = (void *)(unsigned long)hvm_start_info_ptr->modlist_paddr; + + end = max(end, start + sizeof(struct hvm_start_info)); + end = max(end, hvm_start_info_ptr->modlist_paddr + + hvm_start_info_ptr->nr_modules * + sizeof(struct hvm_modlist_entry)); + for ( m = 0; m < hvm_start_info_ptr->nr_modules; m++ ) + { + cmdline = (char *)(unsigned long)mod[m].cmdline_paddr; + if ( cmdline ) + end = max(end, (unsigned long)cmdline + strlen(cmdline) + 1); + } + cmdline = (char *)(unsigned long)hvm_start_info_ptr->cmdline_paddr; + if ( cmdline ) + end = max(end, (unsigned long)cmdline + strlen(cmdline) + 1); + if ( hvm_start_info_ptr->version >= 1 ) + end = max(end, hvm_start_info_ptr->memmap_paddr + + hvm_start_info_ptr->memmap_entries * + sizeof(struct hvm_memmap_table_entry)); + + end_pfn = PFN_UP(end); + if ( end_pfn > *start_pfn ) + *start_pfn = end_pfn; +} #endif static const struct { @@ -888,6 +964,10 @@ void arch_init_mm(unsigned long* start_pfn_p, unsigned long* max_pfn_p) if ( max_pfn >= MAX_MEM_SIZE / PAGE_SIZE ) max_pfn = MAX_MEM_SIZE / PAGE_SIZE - 1; +#ifndef CONFIG_PARAVIRT + pvh_reserve_start_info(&start_pfn); +#endif + printk(" start_pfn: %lx\n", start_pfn); printk(" max_pfn: %lx\n", max_pfn); diff --git a/include/mm.h b/include/mm.h index 1dc89ddb..995e9862 100644 --- a/include/mm.h +++ b/include/mm.h @@ -74,6 +74,7 @@ static __inline__ int get_order(unsigned long size) void arch_init_demand_mapping_area(void); void arch_init_mm(unsigned long* start_pfn_p, unsigned long* max_pfn_p); +void check_memory_range(unsigned long *from, unsigned long *to); unsigned long allocate_ondemand(unsigned long n, unsigned long alignment); /* map f[i*stride]+i*increment for i in 0..n-1, aligned on alignment pages */ diff --git a/mm.c b/mm.c index 858dc108..8c41d2f2 100644 --- a/mm.c +++ b/mm.c @@ -185,6 +185,25 @@ static void add_memory_range(unsigned long r_min, unsigned long r_max) } } +static void consider_memory_range(unsigned long r_min, unsigned long r_max, + void (*func)(unsigned long, unsigned long)) +{ + unsigned long from = r_min; + unsigned long to = r_max; + + while ( true ) + { + check_memory_range(&from, &to); + if ( from == to ) + return; + + func(from, to); + + from = to; + to = r_max; + } +} + void iterate_memory_range(unsigned long min, unsigned long max, void (*func)(unsigned long, unsigned long)) { @@ -207,7 +226,7 @@ void iterate_memory_range(unsigned long min, unsigned long max, if ( r_max > max ) r_max = max; - func(r_min, r_max); + consider_memory_range(r_min, r_max, func); } } -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Wed Jul 02 08:21:10 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 02 Jul 2025 08:21:10 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1030511.1404240 (Exim 4.92) (envelope-from ) id 1uWsiL-0000uu-Vn; Wed, 02 Jul 2025 08:21:09 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1030511.1404240; Wed, 02 Jul 2025 08:21:09 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uWsiL-0000uR-P1; 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Wed, 2 Jul 2025 08:14:37 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id A0ptNG3qZGiQSQAAD6G6ig (envelope-from ); Wed, 02 Jul 2025 08:14:37 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: 98d1df3c-571c-11f0-b894-0df219b8e170 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444078; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=IOlYonHclfoRpw7enkWmqDj5I9EaGv63Xf2WTPy7orA=; b=f+GFtsUZ7F//peCVEaNHQTq0QAx9UWtfSwAvQ7VXwDUSdDItK1h9buqwSdRzcXMx0yqVjO CR3tl8hrURsfptqpNeroPzz6BNLg1Vitpfl+AucQ0o2YI2T/sPBiiOhuKMqEFRdtzD4xjt sNtha5Pd0MjsUms8oWTEZTr7WgR7Qi4= Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444078; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=IOlYonHclfoRpw7enkWmqDj5I9EaGv63Xf2WTPy7orA=; b=f+GFtsUZ7F//peCVEaNHQTq0QAx9UWtfSwAvQ7VXwDUSdDItK1h9buqwSdRzcXMx0yqVjO CR3tl8hrURsfptqpNeroPzz6BNLg1Vitpfl+AucQ0o2YI2T/sPBiiOhuKMqEFRdtzD4xjt sNtha5Pd0MjsUms8oWTEZTr7WgR7Qi4= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 18/19] 9pfs: add support to keep device opened across kexec Date: Wed, 2 Jul 2025 10:12:53 +0200 Message-ID: <20250702081254.14383-19-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250702081254.14383-1-jgross@suse.com> References: <20250702081254.14383-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.com:email,suse.com:mid]; RCVD_TLS_ALL(0.00)[] X-Spam-Level: X-Spam-Flag: NO X-Spam-Score: -2.80 In order to support Xenstore-stubdom live update, the 9pfs device used to save and restore the Xenstore state needs to be kept open across kexec, as otherwise re-opening of the device using the new kernel would not work (this would require Xenstore to be active, which is obviously not possible before having read the saved state). Add an alternative init function for a 9pfs device supporting to take the configuration from the kexec module instead of Xenstore. Add support for creating the device using the kexec module, too. Signed-off-by: Juergen Gross --- 9pfront.c | 120 +++++++++++++++++++++++++++++++++++++++++----- include/9pfront.h | 9 ++++ include/kexec.h | 1 + 3 files changed, 117 insertions(+), 13 deletions(-) diff --git a/9pfront.c b/9pfront.c index 8da2f726..b3106d13 100644 --- a/9pfront.c +++ b/9pfront.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -26,6 +27,7 @@ struct dev_9pfs { unsigned int dom; char *backend; char bepath[64]; + bool kexecmem; char *tag; const char *mnt; @@ -58,6 +60,13 @@ struct dev_9pfs { unsigned long long fid_mask; /* Bit mask for free fids. */ }; +struct kexec_9pfs_rec { + grant_ref_t ring_ref; + evtchn_port_t evtchn; + RING_IDX prod_pvt_out; + RING_IDX cons_pvt_in; +}; + struct file_9pfs { uint32_t fid; struct dev_9pfs *dev; @@ -898,7 +907,7 @@ static bool path_canonical(const char *pathname) return true; } -static int connect_9pfs(struct dev_9pfs *dev) +static int connect_9pfs(struct dev_9pfs *dev, bool do_attach) { int ret; @@ -906,7 +915,7 @@ static int connect_9pfs(struct dev_9pfs *dev) if ( ret ) return ret; - return p9_attach(dev); + return do_attach ? p9_attach(dev) : 0; } static void intr_9pfs(evtchn_port_t port, struct pt_regs *regs, void *data) @@ -1079,6 +1088,9 @@ static int open_9pfs(struct mount_point *mnt, const char *pathname, int flags, return -1; } +static int kexec_recid = -1; +static struct dev_9pfs *kexec_dev; + static void free_9pfront(struct dev_9pfs *dev) { unsigned int i; @@ -1087,13 +1099,22 @@ static void free_9pfront(struct dev_9pfs *dev) { for ( i = 0; i < (1 << dev->ring_order); i++ ) gnttab_end_access(dev->intf->ref[i]); - free_pages(dev->data.in, dev->ring_order); + if ( dev->kexecmem ) + kexec_free_mod_pages(kexec_recid, (unsigned long)dev->data.in, + 1 << dev->ring_order); + else + free_pages(dev->data.in, dev->ring_order); } unbind_evtchn(dev->evtchn); gnttab_end_access(dev->ring_ref); - free_page(dev->intf); + if ( dev->kexecmem ) + kexec_free_mod_pages(kexec_recid, (unsigned long)dev->intf, 1); + else + free_page(dev->intf); free(dev->backend); free(dev->tag); + if ( dev == kexec_dev ) + kexec_dev = NULL; free(dev); } @@ -1111,7 +1132,7 @@ static bool issue_err(struct dev_9pfs *dev, char *msg, char *reason) return false; } -static bool read_config_xs(struct dev_9pfs *dev) +static bool read_config_xs(struct dev_9pfs *dev, struct kexec_9pfs_rec *rec) { char *msg; char *reason = ""; @@ -1121,7 +1142,9 @@ static bool read_config_xs(struct dev_9pfs *dev) char *v; void *addr; unsigned int i; + unsigned int n_pages; int retry = 1; + int err; msg = xenbus_read_unsigned(XBT_NIL, dev->nodename, "backend-id", &dev->dom); if ( msg ) @@ -1177,7 +1200,9 @@ static bool read_config_xs(struct dev_9pfs *dev) return issue_err(dev, msg, reason); } - dev->intf = (void *)alloc_page(); + dev->intf = (void *)(dev->kexecmem + ? kexec_alloc_mod_pages(kexec_recid, 1) + : alloc_page()); if ( !dev->intf ) { reason = "couldn't allocate shared interface page"; @@ -1191,14 +1216,17 @@ static bool read_config_xs(struct dev_9pfs *dev) return issue_err(dev, msg, reason); } dev->intf->ring_order = dev->ring_order; - dev->data.in = (void *)alloc_pages(dev->ring_order); + n_pages = 1 << dev->ring_order; + dev->data.in = (void *)(dev->kexecmem + ? kexec_alloc_mod_pages(kexec_recid, n_pages) + : alloc_pages(dev->ring_order)); if ( !dev->data.in ) { reason = "couldn't allocate ring pages"; return issue_err(dev, msg, reason); } dev->data.out = dev->data.in + XEN_FLEX_RING_SIZE(dev->ring_order); - for ( i = 0; i < (1 << dev->ring_order); i++ ) + for ( i = 0; i < n_pages; i++ ) { addr = dev->data.in + i * PAGE_SIZE; dev->intf->ref[i] = gnttab_grant_access(dev->dom, virt_to_mfn(addr), 0); @@ -1256,18 +1284,65 @@ static bool read_config_xs(struct dev_9pfs *dev) if ( msg ) return issue_err(dev, msg, reason); + if ( dev->kexecmem ) + { + rec->ring_ref = dev->ring_ref; + rec->evtchn = dev->evtchn; + err = kexec_upd_mod_record(kexec_recid, KEXECMOD_REC_9PFS, rec, + sizeof(*rec)); + BUG_ON(err); + } + return true; } -void *init_9pfront(unsigned int id, const char *mnt) +#ifdef CONFIG_KEXEC +static int kexec_9pfront(bool undo) +{ + struct kexec_9pfs_rec rec; + + if ( kexec_recid < 0 || !kexec_dev || undo ) + return 0; + + kexec_read_mod_record(kexec_recid, &rec, sizeof(rec)); + rec.prod_pvt_out = kexec_dev->prod_pvt_out; + rec.cons_pvt_in = kexec_dev->cons_pvt_in; + kexec_upd_mod_record(kexec_recid, KEXECMOD_REC_9PFS, &rec, sizeof(rec)); + + return 0; +} +kexec_call(kexec_9pfront); +#endif + +static void read_config_kexec(struct dev_9pfs *dev, struct kexec_9pfs_rec *rec) +{ + dev->ring_ref = rec->ring_ref; + dev->evtchn = rec->evtchn; + dev->prod_pvt_out = rec->prod_pvt_out; + dev->cons_pvt_in = rec->cons_pvt_in; + + dev->intf = gnttab_get_addr(dev->ring_ref); + dev->ring_order = dev->intf->ring_order; + dev->data.in = gnttab_get_addr(dev->intf->ref[0]); + dev->data.out = dev->data.in + XEN_FLEX_RING_SIZE(dev->ring_order); + + bind_evtchn(dev->evtchn, intr_9pfs, dev); +} + +void *init_9pfront2(unsigned int id, const char *mnt, unsigned int flags) { struct dev_9pfs *dev; char *reason = ""; unsigned int i; + struct kexec_9pfs_rec record = { }; + unsigned int rec_size; - printk("9pfsfront add %u, for mount at %s\n", id, mnt); + printk("9pfsfront add %u, for mount at %s, flags %x\n", id, mnt, flags); dev = malloc(sizeof(*dev)); memset(dev, 0, sizeof(*dev)); + dev->kexecmem = flags & (INIT9P_FLAG_KEXEC | INIT9P_FLAG_REINIT); + if ( dev->kexecmem ) + kexec_dev = dev; snprintf(dev->nodename, sizeof(dev->nodename), "device/9pfs/%u", id); dev->id = id; init_waitqueue_head(&dev->waitq); @@ -1282,12 +1357,25 @@ void *init_9pfront(unsigned int id, const char *mnt) } dev->free_reqs = 0; - if ( !read_config_xs(dev) ) - goto err_out; + if ( !(flags & INIT9P_FLAG_REINIT) ) + { + if ( dev->kexecmem ) + kexec_recid = kexec_add_mod_record(KEXECMOD_REC_9PFS, &record, + sizeof(record)); + if ( !read_config_xs(dev, &record) ) + goto err_out; + } + else + { + kexec_recid = kexec_find_mod_record(0, KEXECMOD_REC_9PFS, &rec_size); + BUG_ON(kexec_recid < 0 || rec_size != sizeof(record)); + kexec_read_mod_record(kexec_recid, &record, rec_size); + read_config_kexec(dev, &record); + } unmask_evtchn(dev->evtchn); - if ( connect_9pfs(dev) ) + if ( connect_9pfs(dev, !(flags & INIT9P_FLAG_REINIT)) ) { reason = "9pfs connect failed"; goto err; @@ -1309,6 +1397,12 @@ void *init_9pfront(unsigned int id, const char *mnt) free_9pfront(dev); return NULL; } +EXPORT_SYMBOL(init_9pfront2); + +void *init_9pfront(unsigned int id, const char *mnt) +{ + return init_9pfront2(id, mnt, 0); +} EXPORT_SYMBOL(init_9pfront); void shutdown_9pfront(void *dev) diff --git a/include/9pfront.h b/include/9pfront.h index 722ec564..a0cb5487 100644 --- a/include/9pfront.h +++ b/include/9pfront.h @@ -2,6 +2,15 @@ #define __9PFRONT_H__ void *init_9pfront(unsigned int id, const char *mnt); +void *init_9pfront2(unsigned int id, const char *mnt, unsigned int flags); +#ifdef CONFIG_KEXEC +#define INIT9P_FLAG_REINIT 0x01 /* Reinit with data from kexec module. */ +#define INIT9P_FLAG_KEXEC 0x02 /* Use kexec module for interface. */ +#else +#define INIT9P_FLAG_REINIT 0 +#define INIT9P_FLAG_KEXEC 0 +#endif + void shutdown_9pfront(void *dev); #endif /* __9PFRONT_H__ */ diff --git a/include/kexec.h b/include/kexec.h index 1e753ee1..b358b202 100644 --- a/include/kexec.h +++ b/include/kexec.h @@ -34,6 +34,7 @@ struct kexec_module_rec { uint16_t offset; /* Offset to record from start of page. */ uint8_t type; /* Type of record. */ #define KEXECMOD_REC_NONE 0 +#define KEXECMOD_REC_9PFS 1 uint8_t size; /* Size of record. */ }; -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Wed Jul 02 08:21:11 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 02 Jul 2025 08:21:11 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1030514.1404243 (Exim 4.92) (envelope-from ) id 1uWsiN-000152-09; Wed, 02 Jul 2025 08:21:11 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1030514.1404243; Wed, 02 Jul 2025 08:21:10 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uWsiM-00014B-SS; 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Wed, 2 Jul 2025 08:14:09 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id K/rrOFHqZGhoSQAAD6G6ig (envelope-from ); Wed, 02 Jul 2025 08:14:09 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: 8824bf6e-571c-11f0-a313-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444050; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=NPQ4KdPqGaFvUqDWb/++eBiyJkIUFURqS3mOYAtyiPM=; b=hXncPUa3E1HRPhmofLuq/RAN/uukbVkUMGFk8Gpex8fFSEypkOMdLbhxwQGrMYIqS911de 2HQgufJUD+6cLcHrDeJ6ckBKphxYI8auBN4aFbGSJJTQstRTjnSsGjXW/B/9JsEKuxe5LR igDgaQpAZMV6x2c6QO+xHzPccp0ZNJc= Authentication-Results: smtp-out2.suse.de; dkim=pass header.d=suse.com header.s=susede1 header.b=hXncPUa3 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444050; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=NPQ4KdPqGaFvUqDWb/++eBiyJkIUFURqS3mOYAtyiPM=; b=hXncPUa3E1HRPhmofLuq/RAN/uukbVkUMGFk8Gpex8fFSEypkOMdLbhxwQGrMYIqS911de 2HQgufJUD+6cLcHrDeJ6ckBKphxYI8auBN4aFbGSJJTQstRTjnSsGjXW/B/9JsEKuxe5LR igDgaQpAZMV6x2c6QO+xHzPccp0ZNJc= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 13/19] kexec: add support for allocating pages from kexec module memory Date: Wed, 2 Jul 2025 10:12:48 +0200 Message-ID: <20250702081254.14383-14-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250702081254.14383-1-jgross@suse.com> References: <20250702081254.14383-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-3.01 / 50.00]; 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As the pages are always related to a kexec module record, add the related utility functions, too. For now only support adding records and retrieving them. Signed-off-by: Juergen Gross --- arch/x86/kexec.c | 16 +++++++ include/kexec.h | 52 +++++++++++++++++++++ kexec.c | 115 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 183 insertions(+) diff --git a/arch/x86/kexec.c b/arch/x86/kexec.c index 7fb98473..8b3e841a 100644 --- a/arch/x86/kexec.c +++ b/arch/x86/kexec.c @@ -238,6 +238,9 @@ static void get_mod_addr(unsigned long from, unsigned long to) #define min(a, b) ((a) < (b) ? (a) : (b)) void kexec_module(unsigned long start_pfn, unsigned long max_pfn) { + unsigned int i; + char *rec_end; + /* Reuse already existing kexec module. */ mod_ptr = kexec_check_module(); if ( !mod_ptr && CONFIG_KEXEC_MODULE_PAGES ) @@ -255,11 +258,24 @@ void kexec_module(unsigned long start_pfn, unsigned long max_pfn) sizeof(mod_ptr->eye_catcher)); mod_ptr->n_pages = CONFIG_KEXEC_MODULE_PAGES - 1; memset(mod_ptr->pg2rec, KEXECMOD_PG_FREE, mod_ptr->n_pages); + mod_ptr->n_records = 16; mod_ptr->recs_off = sizeof(struct kexec_module) + CONFIG_KEXEC_MODULE_PAGES + (mod_ptr->n_pages & 1); set_reserved_range(kexec_mod_start, (unsigned long)mod_ptr + PAGE_SIZE); } + + mod_recs = (void *)((unsigned long)mod_ptr + mod_ptr->recs_off); + mod_rec_start = (char *)(mod_recs + mod_ptr->n_records); + mod_rec_end = mod_rec_start; + for ( i = 0; i < mod_ptr->n_records; i++ ) + { + if ( mod_recs[i].type == KEXECMOD_REC_NONE ) + continue; + rec_end = (char *)mod_ptr + mod_recs[i].offset + mod_recs[i].size; + if ( mod_rec_end < rec_end ) + mod_rec_end = rec_end; + } } void kexec_set_param_loc(const char *cmdline) diff --git a/include/kexec.h b/include/kexec.h index 0200005f..1e753ee1 100644 --- a/include/kexec.h +++ b/include/kexec.h @@ -43,6 +43,9 @@ struct kexec_module_rec { extern unsigned long kexec_mod_start; extern struct kexec_module *mod_ptr; +extern struct kexec_module_rec *mod_recs; +extern char *mod_rec_start; +extern char *mod_rec_end; /* One element of kexec actions (last element must have action KEXEC_CALL): */ struct kexec_action { @@ -56,6 +59,17 @@ struct kexec_action { void *src; }; +#ifdef CONFIG_KEXEC +unsigned long kexec_alloc_mod_pages(unsigned int recid, unsigned int n); +void kexec_free_mod_pages(unsigned int recid, unsigned long addr, + unsigned int n); +int kexec_find_mod_record(unsigned int start_idx, unsigned int type, + unsigned int *size); +int kexec_add_mod_record(unsigned int type, void *addr, unsigned int size); +int kexec_upd_mod_record(unsigned int idx, unsigned int type, + void *addr, unsigned int size); +int kexec_read_mod_record(unsigned int idx, void *addr, unsigned int size); + #define KEXEC_MAX_ACTIONS 16 extern char _kexec_start[], _kexec_end[]; @@ -105,4 +119,42 @@ void kexec_move_used_pages_undo(void); /* Check for kexec module and create kexec memory if needed. */ void kexec_module(unsigned long start_pfn, unsigned long max_pfn); +#else /* CONFIG_KEXEC */ +static inline unsigned long kexec_alloc_mod_pages(unsigned int recid, + unsigned int n) +{ + return 0; +} + +static inline void kexec_free_mod_pages(unsigned int recid, unsigned long addr, + unsigned int n) +{ +} + +static inline int kexec_find_mod_record(unsigned int start_idx, + unsigned int type, unsigned int *size) +{ + return 0; +} + +static inline int kexec_add_mod_record(unsigned int type, void *addr, + unsigned int size) +{ + return 0; +} + +static inline int kexec_upd_mod_record(unsigned int idx, unsigned int type, + void *addr, unsigned int size) +{ + return 0; +} + +static inline int kexec_read_mod_record(unsigned int idx, void *addr, + unsigned int size) +{ + return 0; +} + +#endif + #endif /* _KEXEC_H */ diff --git a/kexec.c b/kexec.c index ded29882..f17ed13d 100644 --- a/kexec.c +++ b/kexec.c @@ -253,3 +253,118 @@ int kexec_add_action(int action, void *dest, void *src, unsigned int len) unsigned long kexec_mod_start; struct kexec_module *mod_ptr; +struct kexec_module_rec *mod_recs; +char *mod_rec_start; +char *mod_rec_end; + +unsigned long kexec_alloc_mod_pages(unsigned int recid, unsigned int n) +{ + unsigned int first = 0, i; + + for ( i = 0; i < mod_ptr->n_pages; i++ ) + { + if ( i - first == n - 1 ) + { + for ( i = 0; i < n; i++ ) + mod_ptr->pg2rec[first + i] = recid; + + return kexec_mod_start + PFN_PHYS(first); + } + + if ( mod_ptr->pg2rec[i] != KEXECMOD_PG_FREE ) + first = i + 1; + } + + printk("Kexec module out of memory\n"); + BUG(); +} + +void kexec_free_mod_pages(unsigned int recid, unsigned long addr, + unsigned int n) +{ + unsigned int s = PHYS_PFN(addr - kexec_mod_start); + unsigned int i; + + BUG_ON(addr < kexec_mod_start || + addr + PFN_PHYS(n) > (unsigned long)mod_ptr); + + for ( i = 0; i < n; i++ ) + { + BUG_ON(mod_ptr->pg2rec[s + i] != recid); + mod_ptr->pg2rec[s + i] = KEXECMOD_PG_FREE; + } +} + +int kexec_find_mod_record(unsigned int start_idx, unsigned int type, + unsigned int *size) +{ + unsigned int i; + + for ( i = start_idx; i < mod_ptr->n_records; i++ ) + { + if ( mod_recs[i].type == type ) + { + *size = mod_recs[i].size; + return i; + } + } + + return -ENOENT; +} + +int kexec_add_mod_record(unsigned int type, void *addr, unsigned int size) +{ + unsigned int i; + + if ( mod_rec_end + size > (char *)mod_ptr + PAGE_SIZE ) + { + /* TODO: support compressing record space. */ + printk("Kexec module record space exhausted\n"); + BUG(); + } + + for ( i = 0; i < mod_ptr->n_records; i++ ) + { + if ( mod_recs[i].type == KEXECMOD_REC_NONE ) + { + mod_recs[i].offset = mod_rec_end - (char *)mod_ptr; + mod_recs[i].type = type; + mod_recs[i].size = size; + memcpy(mod_rec_end, addr, size); + mod_rec_end = mod_rec_end + size; + + return i; + } + } + + /* TODO: support extending the mod_recs[] table. */ + printk("Kexec module record table exhausted\n"); + BUG(); +} + +int kexec_upd_mod_record(unsigned int idx, unsigned int type, + void *addr, unsigned int size) +{ + if ( idx >= mod_ptr->n_records ) + return -ENOENT; + + if ( mod_recs[idx].type != type || mod_recs[idx].size != size ) + return -EINVAL; + + memcpy((char *)mod_ptr + mod_recs[idx].offset, addr, size); + + return 0; +} + +int kexec_read_mod_record(unsigned int idx, void *addr, unsigned int size) +{ + if ( idx >= mod_ptr->n_records ) + return -ENOENT; + + if ( mod_recs[idx].size != size ) + return -EINVAL; + + memcpy(addr, (char *)mod_ptr + mod_recs[idx].offset, size); + + return 0; +} -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Wed Jul 02 08:21:14 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 02 Jul 2025 08:21:14 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1030518.1404253 (Exim 4.92) (envelope-from ) id 1uWsiQ-0001R9-Dg; Wed, 02 Jul 2025 08:21:14 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1030518.1404253; 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bh=Dn//+GflyhXs2E0/uE+NcjSGBv2wFdky7ji5ZDIU8Zg=; b=f7se+NC+/YQxrV6M43+eU/zCuMOd9cu6Lhut6ul6uwQGpvbXSBlfFuc9lyEltMWbEbPEFT nQSrzkXXIDKSpACunye31nFwclpObMGIzKtKGAq9uQwnr3S8kHpyFkbcGMfPg2CwI7m1GQ s1c5iPYajFjhe0zgy0OlmdmsELmyCLA= Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444083; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Dn//+GflyhXs2E0/uE+NcjSGBv2wFdky7ji5ZDIU8Zg=; b=f7se+NC+/YQxrV6M43+eU/zCuMOd9cu6Lhut6ul6uwQGpvbXSBlfFuc9lyEltMWbEbPEFT nQSrzkXXIDKSpACunye31nFwclpObMGIzKtKGAq9uQwnr3S8kHpyFkbcGMfPg2CwI7m1GQ s1c5iPYajFjhe0zgy0OlmdmsELmyCLA= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 19/19] events: export bind_evtchn() Date: Wed, 2 Jul 2025 10:12:54 +0200 Message-ID: <20250702081254.14383-20-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250702081254.14383-1-jgross@suse.com> References: <20250702081254.14383-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Flag: NO X-Spam-Score: -2.80 X-Spamd-Result: default: False [-2.80 / 50.00]; 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Signed-off-by: Juergen Gross --- events.c | 1 + 1 file changed, 1 insertion(+) diff --git a/events.c b/events.c index 9f3dbf05..a9c1ccac 100644 --- a/events.c +++ b/events.c @@ -98,6 +98,7 @@ evtchn_port_t bind_evtchn(evtchn_port_t port, evtchn_handler_t handler, return port; } +EXPORT_SYMBOL(bind_evtchn); void unbind_evtchn(evtchn_port_t port ) { -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Wed Jul 02 08:21:32 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 02 Jul 2025 08:21:32 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1030552.1404291 (Exim 4.92) (envelope-from ) id 1uWsii-0003fZ-HL; Wed, 02 Jul 2025 08:21:32 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1030552.1404291; Wed, 02 Jul 2025 08:21:32 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uWsii-0003fN-EO; 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dkim=pass header.d=suse.com header.s=susede1 header.b="fQ91/Tq1" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444072; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=54mI4K8Jcav8/UHRZBznVBm2r964lgKK2S2ajy90lfI=; b=fQ91/Tq1HHqJAZXlitD6NTxWGKPPuAPEEk9yW0rDf+nuEHweE0EAuAGuC2V8HRZf5WAWV5 M/xczjTIe2iIXLlinC61i/f0wPUGimKtMh1+pL9vglLC81m712y4AJmAA2HDolJufqlyuL MYs/6LkebIWR+huYNvzaP6iVw1m+yJM= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 17/19] gnttab: add function to obtain memory address from grantref Date: Wed, 2 Jul 2025 10:12:52 +0200 Message-ID: <20250702081254.14383-18-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250702081254.14383-1-jgross@suse.com> References: <20250702081254.14383-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-3.01 / 50.00]; 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Signed-off-by: Juergen Gross --- gnttab.c | 10 ++++++++++ include/gnttab.h | 1 + 2 files changed, 11 insertions(+) diff --git a/gnttab.c b/gnttab.c index 6bac0905..52d6792a 100644 --- a/gnttab.c +++ b/gnttab.c @@ -149,6 +149,16 @@ gnttab_end_transfer(grant_ref_t ref) } EXPORT_SYMBOL(gnttab_end_transfer); +void *gnttab_get_addr(grant_ref_t ref) +{ + BUG_ON(ref >= NR_GRANT_ENTRIES || ref < NR_RESERVED_ENTRIES); + + if ( !gnttab_table[ref].flags ) + return NULL; + + return mfn_to_virt(gnttab_table[ref].frame); +} + static const char * const gnttabop_error_msgs[] = GNTTABOP_error_msgs; const char * diff --git a/include/gnttab.h b/include/gnttab.h index 108c4425..46e72a36 100644 --- a/include/gnttab.h +++ b/include/gnttab.h @@ -9,6 +9,7 @@ grant_ref_t gnttab_grant_access(domid_t domid, unsigned long frame, grant_ref_t gnttab_grant_transfer(domid_t domid, unsigned long pfn); unsigned long gnttab_end_transfer(grant_ref_t gref); int gnttab_end_access(grant_ref_t ref); +void *gnttab_get_addr(grant_ref_t ref); const char *gnttabop_error(int16_t status); void fini_gnttab(void); void suspend_gnttab(void); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Wed Jul 02 08:21:33 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 02 Jul 2025 08:21:33 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1030556.1404299 (Exim 4.92) (envelope-from ) id 1uWsij-0003lb-9N; Wed, 02 Jul 2025 08:21:33 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1030556.1404299; Wed, 02 Jul 2025 08:21:33 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uWsii-0003kN-Vy; Wed, 02 Jul 2025 08:21:32 +0000 Received: by outflank-mailman (input) for mailman id 1030556; Wed, 02 Jul 2025 08:21:31 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uWsb4-00082Y-2Y for minios-devel@lists.xenproject.org; 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Wed, 02 Jul 2025 08:13:36 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: 74464130-571c-11f0-a313-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444016; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=tdGpyRgE6zFBkEZAGFiUxZVsQXRgwUjyVMbYAPLusAo=; b=WaR0MKyG0M0KAo1/03X7Z9/YBAj/liSQUxDFbcAcLRMtvm/Lpy9u8RY2tEgZsywKHVtM6u qEx8bKBeikJiQ4tkl65SALgmqw2ZqMiwm/eet8fap3dPd8pmHMfiN4dvTVU9dI01mU8FmF IV5yO4o5Fwd9K+4+ZgYX0kzkwVqDN/M= Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444016; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=tdGpyRgE6zFBkEZAGFiUxZVsQXRgwUjyVMbYAPLusAo=; b=WaR0MKyG0M0KAo1/03X7Z9/YBAj/liSQUxDFbcAcLRMtvm/Lpy9u8RY2tEgZsywKHVtM6u qEx8bKBeikJiQ4tkl65SALgmqw2ZqMiwm/eet8fap3dPd8pmHMfiN4dvTVU9dI01mU8FmF IV5yO4o5Fwd9K+4+ZgYX0kzkwVqDN/M= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 07/19] kexec: fix physical addresses in start info data Date: Wed, 2 Jul 2025 10:12:42 +0200 Message-ID: <20250702081254.14383-8-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250702081254.14383-1-jgross@suse.com> References: <20250702081254.14383-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.com:email,suse.com:mid]; RCVD_TLS_ALL(0.00)[] X-Spam-Level: X-Spam-Flag: NO X-Spam-Score: -2.80 The physical addresses in struct hvm_start_info are pointing to the memory where the data is being built instead of the location where it will finally be moved to. Fix that. Fixes: b7994b6409a4 ("mini-os: kexec: build parameters for new kernel") Signed-off-by: Juergen Gross --- arch/x86/kexec.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/kexec.c b/arch/x86/kexec.c index fc58473e..d84df42c 100644 --- a/arch/x86/kexec.c +++ b/arch/x86/kexec.c @@ -233,9 +233,9 @@ int kexec_get_entry(const char *cmdline) memset(info, 0, sizeof(*info)); info->magic = XEN_HVM_START_MAGIC_VALUE; info->version = 1; - info->cmdline_paddr = kexec_param_mem + sizeof(*info) + + info->cmdline_paddr = kexec_param_loc + sizeof(*info) + e820_entries * sizeof(struct hvm_memmap_table_entry); - info->memmap_paddr = kexec_param_mem + sizeof(*info); + info->memmap_paddr = kexec_param_loc + sizeof(*info); info->memmap_entries = e820_entries; mmap = (struct hvm_memmap_table_entry *)(info + 1); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Wed Jul 02 08:21:53 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 02 Jul 2025 08:21:53 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1030592.1404370 (Exim 4.92) (envelope-from ) id 1uWsj2-0007AV-L6; 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bh=AClNjBUa8IKDahSUwbZj7GWAX64ZZsn1WmMAweYfVPU=; b=WbXtKzGHGA0ajhZ8IOQHOWZWrliegkzhZIi4aU0iHuZkDLvsdla5zr9l5DwwWxZ82clPJ1 pSIRaKP+KAYUVZLXx9k57w7vDRGqxJLNPCnr23Rj3pDXI/xiJgTCyWYVWryLrvi5Orz17r GcN150F9qeLiwB0oyUyoa5RzK3nr6xo= Authentication-Results: smtp-out2.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444055; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=AClNjBUa8IKDahSUwbZj7GWAX64ZZsn1WmMAweYfVPU=; b=WbXtKzGHGA0ajhZ8IOQHOWZWrliegkzhZIi4aU0iHuZkDLvsdla5zr9l5DwwWxZ82clPJ1 pSIRaKP+KAYUVZLXx9k57w7vDRGqxJLNPCnr23Rj3pDXI/xiJgTCyWYVWryLrvi5Orz17r GcN150F9qeLiwB0oyUyoa5RzK3nr6xo= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 14/19] 9pfs: store bepath in struct struct dev_9pfs Date: Wed, 2 Jul 2025 10:12:49 +0200 Message-ID: <20250702081254.14383-15-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250702081254.14383-1-jgross@suse.com> References: <20250702081254.14383-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Flag: NO X-Spam-Score: -2.80 X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.com:mid,suse.com:email]; RCVD_TLS_ALL(0.00)[] X-Spam-Level: Use struct dev_9pfs for storing the backend path of the device state in order to avoid code duplication in init_9pfront() and shutdown_9pfront(). Signed-off-by: Juergen Gross --- 9pfront.c | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-) diff --git a/9pfront.c b/9pfront.c index 895426d1..2bfc49b1 100644 --- a/9pfront.c +++ b/9pfront.c @@ -25,6 +25,7 @@ struct dev_9pfs { char nodename[20]; unsigned int dom; char *backend; + char bepath[64]; char *tag; const char *mnt; @@ -1103,7 +1104,6 @@ void *init_9pfront(unsigned int id, const char *mnt) char *reason = ""; xenbus_transaction_t xbt; int retry = 1; - char bepath[64] = { 0 }; XenbusState state; unsigned int i; void *addr; @@ -1137,11 +1137,12 @@ void *init_9pfront(unsigned int id, const char *mnt) if ( msg ) goto err; - snprintf(bepath, sizeof(bepath), "%s/state", dev->backend); - free(xenbus_watch_path_token(XBT_NIL, bepath, bepath, &dev->events)); - state = xenbus_read_integer(bepath); + snprintf(dev->bepath, sizeof(dev->bepath), "%s/state", dev->backend); + free(xenbus_watch_path_token(XBT_NIL, dev->bepath, dev->bepath, + &dev->events)); + state = xenbus_read_integer(dev->bepath); while ( msg == NULL && state < XenbusStateInitWait ) - msg = xenbus_wait_for_state_change(bepath, &state, &dev->events); + msg = xenbus_wait_for_state_change(dev->bepath, &state, &dev->events); if ( msg || state != XenbusStateInitWait ) { reason = "illegal backend state"; @@ -1228,9 +1229,9 @@ void *init_9pfront(unsigned int id, const char *mnt) free(xenbus_transaction_end(xbt, 0, &retry)); } - state = xenbus_read_integer(bepath); + state = xenbus_read_integer(dev->bepath); while ( msg == NULL && state < XenbusStateConnected ) - msg = xenbus_wait_for_state_change(bepath, &state, &dev->events); + msg = xenbus_wait_for_state_change(dev->bepath, &state, &dev->events); if ( msg || state != XenbusStateConnected ) { reason = "illegal backend state"; @@ -1263,8 +1264,6 @@ void *init_9pfront(unsigned int id, const char *mnt) free(xenbus_transaction_end(xbt, 1, &retry)); err: - if ( bepath[0] ) - free(xenbus_unwatch_path_token(XBT_NIL, bepath, bepath)); if ( msg ) printk("9pfsfront add %u failed, error %s accessing Xenstore\n", id, msg); @@ -1279,22 +1278,20 @@ EXPORT_SYMBOL(init_9pfront); void shutdown_9pfront(void *dev) { struct dev_9pfs *dev9p = dev; - char bepath[64]; XenbusState state; char *msg; char *reason = ""; umount(dev9p->mnt); - snprintf(bepath, sizeof(bepath), "%s/state", dev9p->backend); msg = xenbus_printf(XBT_NIL, dev9p->nodename, "state", "%u", XenbusStateClosing); if ( msg ) goto err; - state = xenbus_read_integer(bepath); + state = xenbus_read_integer(dev9p->bepath); while ( msg == NULL && state < XenbusStateClosing) - msg = xenbus_wait_for_state_change(bepath, &state, &dev9p->events); + msg = xenbus_wait_for_state_change(dev9p->bepath, &state, &dev9p->events); if ( msg || state != XenbusStateClosing ) { reason = "illegal backend state"; -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Wed Jul 02 08:21:58 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 02 Jul 2025 08:21:58 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1030598.1404382 (Exim 4.92) (envelope-from ) id 1uWsj8-0007pw-20; 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Wed, 2 Jul 2025 08:14:26 +0000 (UTC) Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id B1AB813A24; Wed, 2 Jul 2025 08:14:26 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id OcHtKWLqZGh5SQAAD6G6ig (envelope-from ); Wed, 02 Jul 2025 08:14:26 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: 921f6439-571c-11f0-b894-0df219b8e170 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444066; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=zDtKgh+ZY1/kdJFUAdITx2mhsJQDxIfukWhnUYKt9Xs=; b=E9DWZ6Na0viwWiCWPwEvvGIAMRSQpkp9uWBmswocEggnZaHHU0DJICmY4fc/xo8wyVo5hS aeybllRqaGHgyXQRMEha9KuwX4F58BjCjSQkbp95iW+A4l7huTXTxERt5Yomy5FEITz5J8 SNJPtsk+IwWk2YMdLIt2z9f380jlCPQ= Authentication-Results: smtp-out2.suse.de; dkim=pass header.d=suse.com header.s=susede1 header.b=E9DWZ6Na DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444066; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=zDtKgh+ZY1/kdJFUAdITx2mhsJQDxIfukWhnUYKt9Xs=; b=E9DWZ6Na0viwWiCWPwEvvGIAMRSQpkp9uWBmswocEggnZaHHU0DJICmY4fc/xo8wyVo5hS aeybllRqaGHgyXQRMEha9KuwX4F58BjCjSQkbp95iW+A4l7huTXTxERt5Yomy5FEITz5J8 SNJPtsk+IwWk2YMdLIt2z9f380jlCPQ= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 16/19] gnttab: remove gnttab_alloc_and_grant() function Date: Wed, 2 Jul 2025 10:12:51 +0200 Message-ID: <20250702081254.14383-17-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250702081254.14383-1-jgross@suse.com> References: <20250702081254.14383-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; TO_DN_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RCVD_COUNT_TWO(0.00)[2]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:dkim,suse.com:mid,suse.com:email,imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns]; RCVD_TLS_ALL(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:104:10:150:64:97:from,2a07:de40:b281:106:10:150:64:167:received]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; RCPT_COUNT_THREE(0.00)[4]; DKIM_TRACE(0.00)[suse.com:+] X-Spam-Level: X-Spam-Flag: NO X-Rspamd-Queue-Id: DA91E1F445 X-Rspamd-Action: no action X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Spam-Score: -3.01 The last user of gnttab_alloc_and_grant() is gone. Remove gnttab_alloc_and_grant() as it is doing more harm than good. It is hard coded to only grant access for dom0, which is not really clear from looking at the function name. It would be possible to add a domid parameter, but given its now 0 users, there doesn't seem to be a real demand for that function. Signed-off-by: Juergen Gross --- gnttab.c | 13 ------------- include/gnttab.h | 1 - 2 files changed, 14 deletions(-) diff --git a/gnttab.c b/gnttab.c index 5b04ab01..6bac0905 100644 --- a/gnttab.c +++ b/gnttab.c @@ -149,19 +149,6 @@ gnttab_end_transfer(grant_ref_t ref) } EXPORT_SYMBOL(gnttab_end_transfer); -grant_ref_t -gnttab_alloc_and_grant(void **map) -{ - unsigned long mfn; - grant_ref_t gref; - - *map = (void *)alloc_page(); - mfn = virt_to_mfn(*map); - gref = gnttab_grant_access(0, mfn, 0); - return gref; -} -EXPORT_SYMBOL(gnttab_alloc_and_grant); - static const char * const gnttabop_error_msgs[] = GNTTABOP_error_msgs; const char * diff --git a/include/gnttab.h b/include/gnttab.h index 974cb89d..108c4425 100644 --- a/include/gnttab.h +++ b/include/gnttab.h @@ -4,7 +4,6 @@ #include void init_gnttab(void); -grant_ref_t gnttab_alloc_and_grant(void **map); grant_ref_t gnttab_grant_access(domid_t domid, unsigned long frame, int readonly); grant_ref_t gnttab_grant_transfer(domid_t domid, unsigned long pfn); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 08 06:37:46 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 08 Jul 2025 06:37:46 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1035969.1408417 (Exim 4.92) (envelope-from ) id 1uZ1xZ-0002t3-AE; Tue, 08 Jul 2025 06:37:45 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1035969.1408417; Tue, 08 Jul 2025 06:37:45 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uZ1xZ-0002sK-56; Tue, 08 Jul 2025 06:37:45 +0000 Received: by outflank-mailman (input) for mailman id 1035969; Tue, 08 Jul 2025 06:37:43 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uZ1xX-0002pb-IR for minios-devel@lists.xenproject.org; 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Tue, 08 Jul 2025 06:37:40 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: 0c21786b-5bc6-11f0-a316-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751956660; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=7cZ7nybzTpaKQKTLfaqiH+YahQsHBpiZj2w8QWGidzY=; b=pMRJqxu6BNCKsbDABIxiRUucT7i4TbVT0WN2u70cVeOEyGtdjLUCD94zmW9jnkkFcudF6i oHDq1jjlfNONcLaPNvgdlsZ4Z79pFDkTWxFIrvLeXJZvpov6U5dlw6CGjYA2DovYE1WNti L1cUCq3KBFh3OV1LWdc9VRkAj+MCSEk= Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751956660; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=7cZ7nybzTpaKQKTLfaqiH+YahQsHBpiZj2w8QWGidzY=; b=pMRJqxu6BNCKsbDABIxiRUucT7i4TbVT0WN2u70cVeOEyGtdjLUCD94zmW9jnkkFcudF6i oHDq1jjlfNONcLaPNvgdlsZ4Z79pFDkTWxFIrvLeXJZvpov6U5dlw6CGjYA2DovYE1WNti L1cUCq3KBFh3OV1LWdc9VRkAj+MCSEk= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 0/2] x86: don't use a memory page for mapping the shared info page Date: Tue, 8 Jul 2025 08:37:36 +0200 Message-ID: <20250708063738.18994-1-jgross@suse.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.com:mid]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FUZZY_RATELIMITED(0.00)[rspamd.com]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; RCPT_COUNT_THREE(0.00)[4]; RCVD_TLS_ALL(0.00)[] X-Spam-Flag: NO X-Spam-Level: X-Spam-Score: -2.80 This is a small add-on series after the live-update series sent a week ago. I realized that having the shared info page in the normal RAM area is a bad idea when considering kexec, as the new kernel might want it at a different location. So this series is moving the shared info page away from the RAM areas, resulting in a net win of one memory page. Juergen Gross (2): mm: provide a way to do very early page table allocations x86: don't use a memory page for mapping the shared info page arch/x86/mm.c | 23 +++++++++++++++-------- arch/x86/setup.c | 15 ++++++++------- arch/x86/x86_32.S | 7 +------ arch/x86/x86_64.S | 7 +------ hypervisor.c | 15 +++++++++++---- 5 files changed, 36 insertions(+), 31 deletions(-) -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 08 06:37:47 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 08 Jul 2025 06:37:47 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1035970.1408424 (Exim 4.92) (envelope-from ) id 1uZ1xb-00035e-ED; Tue, 08 Jul 2025 06:37:47 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1035970.1408424; Tue, 08 Jul 2025 06:37:47 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uZ1xb-00035Z-BS; 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Tue, 8 Jul 2025 06:37:45 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id h6/+LLm8bGhGNAAAD6G6ig (envelope-from ); Tue, 08 Jul 2025 06:37:45 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: 0ef1f743-5bc6-11f0-a316-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751956665; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=XaZCtOmxWZ4bchm6r7N9WhOaU6PIDyHDuampVATjIrE=; b=oFFrplB2fUkdVy4vsi4s+FPh2TnplrEOFA2H7Xm22aXDq3IXING/fmexWuQnJw0ujRfqbe x/I9nHofkS6McLMoey0hueleuGXaLrZaGDZxO46N38tAE/FgJmJZm+9yZdqeoikQ7PLcE4 5ENvIvR5bi80Rp+rOUXUkiwTVV+25eg= Authentication-Results: smtp-out2.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751956665; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=XaZCtOmxWZ4bchm6r7N9WhOaU6PIDyHDuampVATjIrE=; b=oFFrplB2fUkdVy4vsi4s+FPh2TnplrEOFA2H7Xm22aXDq3IXING/fmexWuQnJw0ujRfqbe x/I9nHofkS6McLMoey0hueleuGXaLrZaGDZxO46N38tAE/FgJmJZm+9yZdqeoikQ7PLcE4 5ENvIvR5bi80Rp+rOUXUkiwTVV+25eg= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 1/2] mm: provide a way to do very early page table allocations Date: Tue, 8 Jul 2025 08:37:37 +0200 Message-ID: <20250708063738.18994-2-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250708063738.18994-1-jgross@suse.com> References: <20250708063738.18994-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Level: X-Spamd-Result: default: False [-6.80 / 50.00]; REPLY(-4.00)[]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; RCVD_COUNT_TWO(0.00)[2]; FROM_HAS_DN(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; FUZZY_RATELIMITED(0.00)[rspamd.com]; RCPT_COUNT_THREE(0.00)[4]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.com:email,suse.com:mid]; RCVD_TLS_ALL(0.00)[] X-Spam-Flag: NO X-Spam-Score: -6.80 Add a small pool of statically allocated memory pages to be handed out for very early page table allocations. This will make it possible to do virtual allocations e.g. for mapping the shared info page. Signed-off-by: Juergen Gross --- arch/x86/mm.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/arch/x86/mm.c b/arch/x86/mm.c index bdff38fd..3f5c7ea7 100644 --- a/arch/x86/mm.c +++ b/arch/x86/mm.c @@ -640,12 +640,17 @@ void change_readonly(bool readonly) * return a valid PTE for a given virtual address. If PTE does not exist, * allocate page-table pages. */ +#define N_PTS 4 +static char early_pt[PAGE_SIZE * N_PTS] __attribute__((aligned(PAGE_SIZE))); +static unsigned long n_early_pt = N_PTS; + static int need_pgt_func(unsigned long va, unsigned int lvl, bool is_leaf, pgentry_t *pte, void *par) { pgentry_t **result = par; unsigned long pt_mfn; unsigned long pt_pfn; + unsigned long pt_addr; unsigned int idx; if ( !is_leaf ) @@ -664,7 +669,16 @@ static int need_pgt_func(unsigned long va, unsigned int lvl, bool is_leaf, } pt_mfn = virt_to_mfn(pte); - pt_pfn = virt_to_pfn(alloc_page()); + if ( n_early_pt ) + { + n_early_pt--; + pt_addr = (unsigned long)&early_pt[n_early_pt * PAGE_SIZE]; + } + else + { + pt_addr = alloc_page(); + } + pt_pfn = virt_to_pfn(pt_addr); if ( !pt_pfn ) return -1; idx = idx_from_va_lvl(va, lvl); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 08 06:37:53 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 08 Jul 2025 06:37:53 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1035972.1408439 (Exim 4.92) (envelope-from ) id 1uZ1xh-0003Pk-NP; Tue, 08 Jul 2025 06:37:53 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1035972.1408439; Tue, 08 Jul 2025 06:37:53 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uZ1xh-0003Pd-KM; Tue, 08 Jul 2025 06:37:53 +0000 Received: by outflank-mailman (input) for mailman id 1035972; Tue, 08 Jul 2025 06:37:52 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uZ1xg-0002pb-CR for minios-devel@lists.xenproject.org; Tue, 08 Jul 2025 06:37:52 +0000 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.223.130]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 1237e5a9-5bc6-11f0-a316-13f23c93f187; Tue, 08 Jul 2025 08:37:51 +0200 (CEST) Received: from imap1.dmz-prg2.suse.org (imap1.dmz-prg2.suse.org [IPv6:2a07:de40:b281:104:10:150:64:97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 7B81021167; Tue, 8 Jul 2025 06:37:51 +0000 (UTC) Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 52BED13A68; Tue, 8 Jul 2025 06:37:51 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id /ITUEr+8bGhPNAAAD6G6ig (envelope-from ); Tue, 08 Jul 2025 06:37:51 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: 1237e5a9-5bc6-11f0-a316-13f23c93f187 Authentication-Results: smtp-out1.suse.de; none From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 2/2] x86: don't use a memory page for mapping the shared info page Date: Tue, 8 Jul 2025 08:37:38 +0200 Message-ID: <20250708063738.18994-3-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250708063738.18994-1-jgross@suse.com> References: <20250708063738.18994-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Rspamd-Action: no action X-Spam-Flag: NO X-Spam-Level: X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Spamd-Result: default: False [-4.00 / 50.00]; REPLY(-4.00)[] X-Rspamd-Queue-Id: 7B81021167 X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Spam-Score: -4.00 There is no need to use a populated memory page for mapping the shared info page at that location. Just use an allocated virtual address for the shared info page. For PVH allocate an unused pfn. Signed-off-by: Juergen Gross --- arch/x86/mm.c | 7 ------- arch/x86/setup.c | 15 ++++++++------- arch/x86/x86_32.S | 7 +------ arch/x86/x86_64.S | 7 +------ hypervisor.c | 15 +++++++++++---- 5 files changed, 21 insertions(+), 30 deletions(-) diff --git a/arch/x86/mm.c b/arch/x86/mm.c index 3f5c7ea7..78d614a6 100644 --- a/arch/x86/mm.c +++ b/arch/x86/mm.c @@ -497,7 +497,6 @@ static void build_pagetable(unsigned long *start_pfn, unsigned long *max_pfn) /* * Mark portion of the address space read only. */ -extern struct shared_info shared_info; struct change_readonly_par { unsigned long etext; @@ -519,12 +518,6 @@ static int change_readonly_func(unsigned long va, unsigned int lvl, if ( va + (1UL << ptdata[lvl].shift) > ro->etext ) return 1; - if ( va == (unsigned long)&shared_info ) - { - printk("skipped %lx\n", va); - return 0; - } - newval = ro->readonly ? (*pte & ~_PAGE_RW) : (*pte | _PAGE_RW); #ifdef CONFIG_PARAVIRT diff --git a/arch/x86/setup.c b/arch/x86/setup.c index 299ff8c7..8fd55c51 100644 --- a/arch/x86/setup.c +++ b/arch/x86/setup.c @@ -47,8 +47,6 @@ shared_info_t *HYPERVISOR_shared_info; */ char stack[2*STACK_SIZE]; -extern char shared_info[PAGE_SIZE]; - static inline void fpu_init(void) { asm volatile("fninit"); } @@ -76,18 +74,21 @@ static void set_info_ptr(start_info_t *ptr) #define hpc_init() +static unsigned long shared_info_va; + shared_info_t *map_shared_info(void) { int rc; - unsigned long pa = start_info_ptr->shared_info; - if ( (rc = HYPERVISOR_update_va_mapping((unsigned long)shared_info, - __pte(pa | 7), UVMF_INVLPG)) ) + if ( !shared_info_va ) + shared_info_va = alloc_virt_kernel(1); + rc = map_frame_rw(shared_info_va, PHYS_PFN(start_info_ptr->shared_info)); + if ( rc ) { printk("Failed to map shared_info!! rc=%d\n", rc); do_exit(); } - return (shared_info_t *)shared_info; + return (shared_info_t *)shared_info_va; } void unmap_shared_info(void) @@ -95,7 +96,7 @@ void unmap_shared_info(void) int rc; pte_t nullpte = { }; - if ( (rc = HYPERVISOR_update_va_mapping((unsigned long)shared_info, + if ( (rc = HYPERVISOR_update_va_mapping(shared_info_va, nullpte, UVMF_INVLPG)) ) { printk("Failed to unmap shared_info page!! rc=%d\n", rc); diff --git a/arch/x86/x86_32.S b/arch/x86/x86_32.S index 3de00277..5d891164 100644 --- a/arch/x86/x86_32.S +++ b/arch/x86/x86_32.S @@ -36,13 +36,8 @@ _start: stack_start: .long stack+(2*__STACK_SIZE), __KERNEL_SS -.globl shared_info, hypercall_page - /* Unpleasant -- the PTE that maps this page is actually overwritten */ - /* to map the real shared-info page! :-) */ .align __PAGE_SIZE -shared_info: - .fill __PAGE_SIZE,1,0 - +.globl hypercall_page hypercall_page: .fill __PAGE_SIZE,1,0 diff --git a/arch/x86/x86_64.S b/arch/x86/x86_64.S index 7529c02e..09b93e39 100644 --- a/arch/x86/x86_64.S +++ b/arch/x86/x86_64.S @@ -33,13 +33,8 @@ _start: stack_start: .quad stack+(2*__STACK_SIZE) -.globl shared_info, hypercall_page - /* Unpleasant -- the PTE that maps this page is actually overwritten */ - /* to map the real shared-info page! :-) */ .align __PAGE_SIZE -shared_info: - .fill __PAGE_SIZE,1,0 - +.globl hypercall_page hypercall_page: .fill __PAGE_SIZE,1,0 diff --git a/hypervisor.c b/hypervisor.c index 6476d658..519a4680 100644 --- a/hypervisor.c +++ b/hypervisor.c @@ -27,8 +27,10 @@ #include #include +#include #include #include +#include #include EXPORT_SYMBOL(hypercall_page); @@ -37,7 +39,8 @@ EXPORT_SYMBOL(hypercall_page); ((sh)->evtchn_pending[idx] & ~(sh)->evtchn_mask[idx]) #ifndef CONFIG_PARAVIRT -extern shared_info_t shared_info; +static unsigned long shinfo_pfn; +static unsigned long shinfo_va; int hvm_get_parameter(int idx, uint64_t *value) { @@ -69,14 +72,16 @@ shared_info_t *map_shared_info(void) { struct xen_add_to_physmap xatp; + shinfo_pfn = e820_get_reserved_pfns(1); xatp.domid = DOMID_SELF; xatp.idx = 0; xatp.space = XENMAPSPACE_shared_info; - xatp.gpfn = virt_to_pfn(&shared_info); + xatp.gpfn = shinfo_pfn; if ( HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp) != 0 ) BUG(); + shinfo_va = map_frame_virt(shinfo_pfn); - return &shared_info; + return (shared_info_t *)shinfo_va; } void unmap_shared_info(void) @@ -84,9 +89,11 @@ void unmap_shared_info(void) struct xen_remove_from_physmap xrtp; xrtp.domid = DOMID_SELF; - xrtp.gpfn = virt_to_pfn(&shared_info); + xrtp.gpfn = shinfo_pfn; if ( HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrtp) != 0 ) BUG(); + unmap_frames(shinfo_va, 1); + e820_put_reserved_pfns(shinfo_pfn, 1); } #endif -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 08 21:25:36 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 08 Jul 2025 21:25:36 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1037285.1409928 (Exim 4.92) (envelope-from ) id 1uZFoi-0003qn-Nj; Tue, 08 Jul 2025 21:25:32 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1037285.1409928; Tue, 08 Jul 2025 21:25:32 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uZFoi-0003qg-Kq; Tue, 08 Jul 2025 21:25:32 +0000 Received: by outflank-mailman (input) for mailman id 1037285; Tue, 08 Jul 2025 21:25:31 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uZFoh-0003qV-BX for minios-devel@lists.xenproject.org; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Jul 2025 21:25:22.2189 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8c09eb86-27d7-4b5b-86c4-08ddbe65f254 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000EE38.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB6448 On 2025-07-02 04:12, Juergen Gross wrote: > Similar to start_info_ptr for PV provide hvm_start_info_ptr for PVH. > > Add a generic function to set the pointer. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Tue Jul 08 21:25:48 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 08 Jul 2025 21:25:48 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1037289.1409943 (Exim 4.92) (envelope-from ) id 1uZFox-0004D5-W6; 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pr=C Message-ID: Date: Tue, 8 Jul 2025 17:08:27 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 02/19] mini-os: kexec: add O_CLOEXEC support To: Juergen Gross , , CC: References: <20250702081254.14383-1-jgross@suse.com> <20250702081254.14383-3-jgross@suse.com> Content-Language: en-US From: Jason Andryuk In-Reply-To: <20250702081254.14383-3-jgross@suse.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: None (SATLEXMB04.amd.com: jason.andryuk@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000EE3F:EE_|MN2PR12MB4405:EE_ X-MS-Office365-Filtering-Correlation-Id: 0089f6fc-f7f9-40ed-e0c4-08ddbe65fdc5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|36860700013|376014|7053199007; X-Microsoft-Antispam-Message-Info: =?utf-8?B?L0RRZi9BZVNqcVFtOFc0YXJTTXVua2lkbk9IWktZME1sSllhUk51WkdFZW5V?= =?utf-8?B?eHpNZHRPWUlSS0NxWmRxemxuVm9JQjFOcWcrRGtoWU9yRHNZb0RSTnZ0eHlQ?= =?utf-8?B?T3RiU0tKVWhrMFlLV3ZUTzNkL1BQREwxeERrSjVRWmswN2MrWXpqZHFXT3Mv?= =?utf-8?B?TGVaRnpFSTc1VGdhU21JMXBnSVdJMWgzSzZwZlV4NTcwSVFXRCtBMGdwZTYv?= =?utf-8?B?cTNYRlZHTG5jUWNXcGZkRnpyb3dQb2ZpUkNDRVovNGxtZ3d4Wlo4d01mYkZ0?= =?utf-8?B?KzVXZW1SZjdSdXhydU15aEh6SjZzVlN6TlNXMFlQakswSmxDZHRLdTA5Vjlo?= =?utf-8?B?bWI5ZXV2ZHZLRmRlUHV4bVRFVEhQQVN4R0oyZHRZbmgzek1MQ21GRy96T1Az?= =?utf-8?B?Wnk1bGlybWpiM3dZbVUweHZqMFBIVWhHcUM0WmJZYzlhWDh6RTFLa211ZjNH?= =?utf-8?B?NnJOaTZEMFdoUDZ0b01sTS9lU2JIeVZIWWwydlk4OENzZTlEeWJSbzNFbkpN?= =?utf-8?B?SlltSXNQdVpLMzd6QjFQTE1qYmVjMEk1bGZHNWVVN2hPS0dPWXNVMXlWeWF2?= =?utf-8?B?MGVsem9XZ055SFdaL3FKaXQzQTFLSmVJSXo4bkZGcXN6RG02Y3dDakU4Nndw?= =?utf-8?B?TUNuTHVhakNMaHdrRHNLakhnN0dlUVNxbEtWN2xDNURvdHNDTFhwa3M4c3gz?= =?utf-8?B?VzRCcTZVVXFGNGxab1oxS3VRWW5tYW1vcGNqS0hmWnJCeVl3TnJlbkM0elhE?= =?utf-8?B?YkNjd0xZSldRREZHUm9XUXlSQUJYMWszYThxOEpzVUFjWVpnTzhQSzlZeHU0?= =?utf-8?B?cDBVTGdoUjNtVDlGUmF0cnVnKzROa0YvRGNiTmFaWHY3b2ZMTDZRcTdvVlpL?= =?utf-8?B?M0tyck9RNFh1WWxkemtWYmF0M2hUMWgvblpGb201aVVkd3BKbVJQZ09zaytr?= =?utf-8?B?YXBVdmREclZuTHplZGxISHpacXR3ZTVRWG1sclFiTUZER1gwZ0J1MVJkU1U5?= =?utf-8?B?UzRaNzRDZDhpcnovOWFtbC9tNXBXZkZpcFcwc25JM05NRUdNOHVoSWNMVG9U?= =?utf-8?B?OEU4ZTZQR0ZIQ2lXLzhyY09hRUFpd2ROemRTc0pGSnJKald2d3ZXNHBBTHc5?= =?utf-8?B?QTJkbHRJcGZiM0NxalZyaVVJTjVTVWR1bUZ3VU1MRCtXTENDdUxMYUcwem4v?= =?utf-8?B?LzZVbzZ6VGpqb0VKNlJyYUczNXN1b0thTm9yYXQvdTZCUHRaMG0wMVpBRkRB?= =?utf-8?B?bHdtamRJbC8xbHdWZ2haRCthMjZIZkI0ZVpack1Yc1Y4bCtZRG41Y0dRc25Z?= =?utf-8?B?ZXdsd2gxK1UrdStYdEUrUzVXUzZHOHQ2VVR5RUV0U0dIQkx5dGk3NUlFdW55?= =?utf-8?B?SExFMXZSempvTlR5ZFBQbEhxSWFDWFRES1hrdlNFMEtqb003U3A4QXBYSXFa?= =?utf-8?B?cHJlNEw1RGd2dzlqOXdRbjBsU0ZyNnEyRytZWnBxY1BzdGNQeVp4M2ljRTVt?= =?utf-8?B?aTdJNnlYOTdCQ2NrM2IyN3NMTW5FbnlQdFpBNWk0WGRVTW5rMjY3S0h0Y0FL?= =?utf-8?B?bnIzWndNV3ZDdVE4SklmTUFhNmJzV25OT1FrN052dktLMURuQ0wyWDRPSXBG?= =?utf-8?B?czd5RU5vdXRxRzZHTXRnbDRkUkF3Z0lLMGtCb08wU1RtR2ZzeDg5QzcrbXF2?= =?utf-8?B?SzM4M05tTzBJM3RaMWdzcDk1bEpzZVo4bnlLQ3l2bnQyR0dWM1NRRTkyM2VJ?= =?utf-8?B?WFlaaVJBaFlTUC9jMnZMSXZOTlRNL0JJNTh1WHFrVjlxcmdEOENRVi9pc2RT?= =?utf-8?B?cjNPNmVsY1NGLy9OUm9wd1l6Z08rMDZXTW0rOS9iNGU1ZVB5UG5scCtBUmdG?= =?utf-8?B?VkovVmZXL1BFTzJPbThJUDQxeWkxTFl5WkxBM0tNdWwvbFVjLzF3aEc1T3ZX?= =?utf-8?B?dzU4ZWw1ZjNVMVh5U0tZUlJXd25WZEVkVGtDSy9UQUgwSE9URlkxd1U4MFZS?= =?utf-8?B?MFNhT0xMVTcxQm02NkhuVDBSWFp0YmR1WnU5ZndxWUhFalNBZEw4aUdGQ0Q1?= =?utf-8?Q?owGrCC?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(1800799024)(82310400026)(36860700013)(376014)(7053199007);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Jul 2025 21:25:41.4175 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0089f6fc-f7f9-40ed-e0c4-08ddbe65fdc5 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000EE3F.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4405 On 2025-07-02 04:12, Juergen Gross wrote: > Define O_CLOEXEC as a non-zero value and add a kexec callback to cycle > over all open files to close them in case O_CLOEXEC was specified when > opening the file. > > This requires the addition of a cloexec boolean in struct file. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Tue Jul 08 21:26:00 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 08 Jul 2025 21:26:00 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1037297.1409963 (Exim 4.92) (envelope-from ) id 1uZFpA-0004hH-L1; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Jul 2025 21:25:47.7832 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e3323a55-cad3-4318-8ec8-08ddbe66018a X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: MN1PEPF0000F0E5.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8928 On 2025-07-02 04:12, Juergen Gross wrote: > When kexec-ing into a new kernel, the grant table might still have > active grants. Support that by not adding populated grant entries to > the list of free grant entries. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Tue Jul 08 21:30:49 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 08 Jul 2025 21:30:49 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1037321.1409970 (Exim 4.92) (envelope-from ) id 1uZFto-0006i3-Sb; Tue, 08 Jul 2025 21:30:48 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1037321.1409970; Tue, 08 Jul 2025 21:30:48 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uZFto-0006hw-Py; Tue, 08 Jul 2025 21:30:48 +0000 Received: by outflank-mailman (input) for mailman id 1037321; Tue, 08 Jul 2025 21:30:47 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uZFtn-0006hl-PE for minios-devel@lists.xenproject.org; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Jul 2025 21:30:40.7955 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9cf81768-a41c-467c-32e8-08ddbe66b032 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CH2PEPF000000A0.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB5724 On 2025-07-02 04:12, Juergen Gross wrote: > Deactivate the VIRQ_TIMER event when doing kexec() in order to be > able to set it up again in the new kernel. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Tue Jul 08 21:30:56 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 08 Jul 2025 21:30:56 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1037325.1409985 (Exim 4.92) (envelope-from ) id 1uZFtw-00072q-Bi; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Jul 2025 21:30:49.6812 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c48515f8-f074-4861-5c84-08ddbe66b587 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF000015CD.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB5981 On 2025-07-02 04:12, Juergen Gross wrote: > Split init_page_allocator() into three functions in order to prepare > for sparing some memory from being added to the buddy allocator. > > Use a function pointer for selecting the function used for handling a > memory range, as this will be needed by a future patch. For the same > reason make iterate_memory_range() globally visible. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Tue Jul 08 21:31:08 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 08 Jul 2025 21:31:08 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1037334.1410004 (Exim 4.92) (envelope-from ) id 1uZFu7-0007cF-V3; Tue, 08 Jul 2025 21:31:07 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1037334.1410004; Tue, 08 Jul 2025 21:31:07 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uZFu7-0007ao-R2; Tue, 08 Jul 2025 21:31:07 +0000 Received: by outflank-mailman (input) for mailman id 1037334; Tue, 08 Jul 2025 21:31:06 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uZFu6-0007OX-3Z for minios-devel@lists.xenproject.org; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Jul 2025 21:30:58.5911 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9ddd5972-ea40-43bb-eb9f-08ddbe66bad2 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000EDD5.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB8347 On 2025-07-02 04:12, Juergen Gross wrote: > When initializing the memory allocator, don't add memory pages of > modules and the initial boot info structure to the free memory. > > This is relevant only when running in PVH mode, as in PV mode only > memory above the initial page tables is added to free memory, and the > module and start_info pages are below the page tables. > > Signed-off-by: Juergen Gross > --- > arch/x86/mm.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++ > include/mm.h | 1 + > mm.c | 21 +++++++++++++- > 3 files changed, 101 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/mm.c b/arch/x86/mm.c > index 26ede6f4..7c3c83be 100644 > --- a/arch/x86/mm.c > +++ b/arch/x86/mm.c > @@ -78,6 +78,10 @@ void arch_mm_preinit(void *p) > last_free_pfn = si->nr_pages; > balloon_set_nr_pages(last_free_pfn, last_free_pfn); > } > + > +void check_memory_range(unsigned long *from, unsigned long *to) > +{ > +} > #else > #include > user_desc gdt[NR_GDT_ENTRIES] = > @@ -125,6 +129,78 @@ void arch_mm_preinit(void *p) > last_free_pfn = e820_get_maxpfn(pages); > balloon_set_nr_pages(pages, last_free_pfn); > } > + > +static void check_memory_range_conflict(unsigned long *from, unsigned long *to, > + unsigned long chk, unsigned long sz) > +{ > + unsigned long chk_end = chk + sz; > + > + if ( *to <= chk || *from >= chk_end ) > + return; > + > + if ( chk <= *from ) > + *from = (chk_end >= *to) ? *to : chk_end; > + else > + *to = chk; > +} > + > +/* Reserved memory ranges not added to free memory. */ > +#define MAX_RSV_RANGES 1 > +static struct { > + unsigned long start; > + unsigned long size; > +} reserved_range[MAX_RSV_RANGES]; > + > +void check_memory_range(unsigned long *from, unsigned long *to) > +{ > + unsigned int m; > + struct hvm_modlist_entry *mod; > + > + for ( m = 0; m < MAX_RSV_RANGES && reserved_range[m].size; m++ ) > + check_memory_range_conflict(from, to, reserved_range[m].start, > + reserved_range[m].size); > + > + mod = (struct hvm_modlist_entry *)(unsigned long) > + hvm_start_info_ptr->modlist_paddr; > + for ( m = 0; m < hvm_start_info_ptr->nr_modules; m++ ) > + check_memory_range_conflict(from, to, mod[m].paddr, mod[m].size); > +} > + > +#define max(a, b) ((a) < (b) ? (b) : (a)) > + > +static void pvh_reserve_start_info(unsigned long *start_pfn) > +{ > + unsigned long end = 0; > + unsigned long start = (unsigned long)hvm_start_info_ptr; > + unsigned long end_pfn; > + unsigned int m; > + struct hvm_modlist_entry *mod; > + char *cmdline; > + > + mod = (void *)(unsigned long)hvm_start_info_ptr->modlist_paddr; > + > + end = max(end, start + sizeof(struct hvm_start_info)); > + end = max(end, hvm_start_info_ptr->modlist_paddr + > + hvm_start_info_ptr->nr_modules * > + sizeof(struct hvm_modlist_entry)); > + for ( m = 0; m < hvm_start_info_ptr->nr_modules; m++ ) > + { > + cmdline = (char *)(unsigned long)mod[m].cmdline_paddr; > + if ( cmdline ) > + end = max(end, (unsigned long)cmdline + strlen(cmdline) + 1); > + } > + cmdline = (char *)(unsigned long)hvm_start_info_ptr->cmdline_paddr; > + if ( cmdline ) > + end = max(end, (unsigned long)cmdline + strlen(cmdline) + 1); > + if ( hvm_start_info_ptr->version >= 1 ) > + end = max(end, hvm_start_info_ptr->memmap_paddr + > + hvm_start_info_ptr->memmap_entries * > + sizeof(struct hvm_memmap_table_entry)); > + > + end_pfn = PFN_UP(end); > + if ( end_pfn > *start_pfn ) > + *start_pfn = end_pfn; > +} > #endif > > static const struct { > @@ -888,6 +964,10 @@ void arch_init_mm(unsigned long* start_pfn_p, unsigned long* max_pfn_p) > if ( max_pfn >= MAX_MEM_SIZE / PAGE_SIZE ) > max_pfn = MAX_MEM_SIZE / PAGE_SIZE - 1; > > +#ifndef CONFIG_PARAVIRT > + pvh_reserve_start_info(&start_pfn); > +#endif > + > printk(" start_pfn: %lx\n", start_pfn); > printk(" max_pfn: %lx\n", max_pfn); > > diff --git a/include/mm.h b/include/mm.h > index 1dc89ddb..995e9862 100644 > --- a/include/mm.h > +++ b/include/mm.h > @@ -74,6 +74,7 @@ static __inline__ int get_order(unsigned long size) > > void arch_init_demand_mapping_area(void); > void arch_init_mm(unsigned long* start_pfn_p, unsigned long* max_pfn_p); > +void check_memory_range(unsigned long *from, unsigned long *to); > > unsigned long allocate_ondemand(unsigned long n, unsigned long alignment); > /* map f[i*stride]+i*increment for i in 0..n-1, aligned on alignment pages */ > diff --git a/mm.c b/mm.c > index 858dc108..8c41d2f2 100644 > --- a/mm.c > +++ b/mm.c > @@ -185,6 +185,25 @@ static void add_memory_range(unsigned long r_min, unsigned long r_max) > } > } > > +static void consider_memory_range(unsigned long r_min, unsigned long r_max, > + void (*func)(unsigned long, unsigned long)) > +{ > + unsigned long from = r_min; > + unsigned long to = r_max; > + > + while ( true ) > + { > + check_memory_range(&from, &to); > + if ( from == to ) > + return; > + > + func(from, to); > + > + from = to; > + to = r_max; > + } > +} > + > void iterate_memory_range(unsigned long min, unsigned long max, > void (*func)(unsigned long, unsigned long)) > { > @@ -207,7 +226,7 @@ void iterate_memory_range(unsigned long min, unsigned long max, > if ( r_max > max ) > r_max = max; > > - func(r_min, r_max); > + consider_memory_range(r_min, r_max, func); > } > } > From minios-devel-bounces@lists.xenproject.org Tue Jul 08 21:31:18 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 08 Jul 2025 21:31:18 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1037347.1410017 (Exim 4.92) (envelope-from ) id 1uZFuI-0008Eq-GV; Tue, 08 Jul 2025 21:31:18 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1037347.1410017; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Jul 2025 21:31:11.2290 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 47dbcf20-8cbd-4f88-2918-08ddbe66c25b X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000EDD2.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH1PPFC8B3B7859 On 2025-07-02 04:12, Juergen Gross wrote: > The physical addresses in struct hvm_start_info are pointing to the > memory where the data is being built instead of the location where it > will finally be moved to. > > Fix that. > > Fixes: b7994b6409a4 ("mini-os: kexec: build parameters for new kernel") > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Tue Jul 08 21:41:13 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 08 Jul 2025 21:41:13 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1037380.1410036 (Exim 4.92) (envelope-from ) id 1uZG3s-0002RN-CY; 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pr=C Message-ID: <513ef9f8-bb20-42e9-be85-0065e67d76f8@amd.com> Date: Tue, 8 Jul 2025 17:14:47 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 09/19] kexec: restructure building the start info data To: Juergen Gross , , CC: References: <20250702081254.14383-1-jgross@suse.com> <20250702081254.14383-10-jgross@suse.com> Content-Language: en-US From: Jason Andryuk In-Reply-To: <20250702081254.14383-10-jgross@suse.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: None (SATLEXMB04.amd.com: jason.andryuk@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL02EPF0001A102:EE_|DS0PR12MB9038:EE_ X-MS-Office365-Filtering-Correlation-Id: 45ea5dc9-0bf9-44df-dfcf-08ddbe66e045 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|376014|36860700013|1800799024|7053199007; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Jul 2025 21:32:01.4654 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 45ea5dc9-0bf9-44df-dfcf-08ddbe66e045 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF0001A102.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB9038 On 2025-07-02 04:12, Juergen Gross wrote: > Instead of setting most of the struct hvm_start_info fields first and > then building the leaf data, restructure kexec_get_entry() by > using an opaque "next" pointer where the next leaf data will be stored > and handle that leaf data together with the associated hvm_start_info > fields. > > This will make it easier to add new data items without having to > rewrite large portions of the function. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Tue Jul 08 21:41:33 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 08 Jul 2025 21:41:33 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1037388.1410050 (Exim 4.92) (envelope-from ) id 1uZG4D-0002rU-Lv; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Jul 2025 21:31:46.3954 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: aca3e5d7-813a-416a-7078-08ddbe66d74d X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF000015CA.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB6832 On 2025-07-02 04:12, Juergen Gross wrote: > When initializing the memory allocator, don't add memory pages of > modules and the initial boot info structure to the free memory. > > This is relevant only when running in PVH mode, as in PV mode only > memory above the initial page tables is added to free memory, and the > module and start_info pages are below the page tables. > > Signed-off-by: Juergen Gross > > +/* Reserved memory ranges not added to free memory. */ > +#define MAX_RSV_RANGES 1 > +static struct { > + unsigned long start; > + unsigned long size; > +} reserved_range[MAX_RSV_RANGES]; > + > +void check_memory_range(unsigned long *from, unsigned long *to) > +{ > + unsigned int m; > + struct hvm_modlist_entry *mod; > + > + for ( m = 0; m < MAX_RSV_RANGES && reserved_range[m].size; m++ ) > + check_memory_range_conflict(from, to, reserved_range[m].start, > + reserved_range[m].size); reserved_range[] isn't updated, so this is dead code. I guess that is fine for now. > + > + mod = (struct hvm_modlist_entry *)(unsigned long) > + hvm_start_info_ptr->modlist_paddr; > + for ( m = 0; m < hvm_start_info_ptr->nr_modules; m++ ) > + check_memory_range_conflict(from, to, mod[m].paddr, mod[m].size); > +} > + > > static const struct { > @@ -888,6 +964,10 @@ void arch_init_mm(unsigned long* start_pfn_p, unsigned long* max_pfn_p) > if ( max_pfn >= MAX_MEM_SIZE / PAGE_SIZE ) > max_pfn = MAX_MEM_SIZE / PAGE_SIZE - 1; > > +#ifndef CONFIG_PARAVIRT > + pvh_reserve_start_info(&start_pfn); > +#endif Maybe this ifdef can be removed and arch_mm_preinit() can call pvh_reserve_start_info() and update first_free_pfn (which is assigned to start_pfn)? 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pr=C Message-ID: <41abf7c9-9d71-4c29-90cf-c19863d6b789@amd.com> Date: Tue, 8 Jul 2025 17:14:10 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 08/19] e820: don't count lapic page as initially reserved To: Juergen Gross , , CC: References: <20250702081254.14383-1-jgross@suse.com> <20250702081254.14383-9-jgross@suse.com> Content-Language: en-US From: Jason Andryuk In-Reply-To: <20250702081254.14383-9-jgross@suse.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: None (SATLEXMB05.amd.com: jason.andryuk@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF000015C7:EE_|MN6PR12MB8544:EE_ X-MS-Office365-Filtering-Correlation-Id: d42a24bb-e267-4430-2b3c-08ddbe66c6e5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|82310400026|36860700013|1800799024|7053199007; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Jul 2025 21:31:18.8131 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d42a24bb-e267-4430-2b3c-08ddbe66c6e5 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF000015C7.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN6PR12MB8544 On 2025-07-02 04:12, Juergen Gross wrote: > The number of pages marked initially as reserved in the memory map > are counted to be allocated, as they are normally populated by Xen > tools for e.g. xenbus and console ring pages. > > This is wrong in case the lapic page is marked as reserved in the > memory map, as there is never memory allocated for a lapic. > > So when finding the lapic page to be marked as reserved, don't add > it to the number of reserved pages. > > Fixes: 9b87429d2864 ("mini-os: fix number of pages for PVH") > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Tue Jul 08 21:48:57 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 08 Jul 2025 21:48:57 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1037423.1410079 (Exim 4.92) (envelope-from ) id 1uZGBM-0004Ib-Nh; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Jul 2025 21:48:47.5357 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0920a6ca-fdf2-467b-9b09-08ddbe6937f6 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000E9D0.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB6649 On 2025-07-02 04:12, Juergen Gross wrote: > For memory areas used to map foreign domain memory Mini-OS is using > the type E820_RESERVED in the memory map today. This is causing > problems with kexec, as the new kernel should not see those areas in > the memory map. Unfortunately the sequence of actions for calculating > the size of the memory map and the removal of those reserved areas > can't easily be adjusted to do the removal first, so another way must > be used to avoid passing those reserved areas to the new kernel. > > Instead of using the type E820_RESERVED, which might be used for other > pages as well, just use a new type. Areas with that new type can > easily be filtered out when building the memory map for the new > kernel. > > Introduce the type E820_TYPE_SOFT_RESERVED with the same value as the > Linux kernel is using for the same purpose. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Wed Jul 09 12:39:05 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 09 Jul 2025 12:39:05 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1038101.1410608 (Exim 4.92) (envelope-from ) id 1uZU4l-0000Ii-Ad; Wed, 09 Jul 2025 12:39:03 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1038101.1410608; Wed, 09 Jul 2025 12:39:03 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uZU4l-0000Ib-7r; Wed, 09 Jul 2025 12:39:03 +0000 Received: by outflank-mailman (input) for mailman id 1038101; Wed, 09 Jul 2025 12:39:02 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uZU4j-0000IQ-RT for minios-devel@lists.xenproject.org; Wed, 09 Jul 2025 12:39:01 +0000 Received: from mail-ed1-x531.google.com (mail-ed1-x531.google.com [2a00:1450:4864:20::531]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id afd4f815-5cc1-11f0-b894-0df219b8e170; Wed, 09 Jul 2025 14:38:59 +0200 (CEST) Received: by mail-ed1-x531.google.com with SMTP id 4fb4d7f45d1cf-60cc11b34f6so1575953a12.0 for ; Wed, 09 Jul 2025 05:38:59 -0700 (PDT) Received: from ?IPV6:2003:e5:8709:f00:6357:915b:11f9:6d20? 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Wed, 09 Jul 2025 05:38:59 -0700 (PDT) Message-ID: Date: Wed, 9 Jul 2025 14:38:57 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 06/19] mm: don't add module pages to free memory To: Jason Andryuk , minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org References: <20250702081254.14383-1-jgross@suse.com> <20250702081254.14383-7-jgross@suse.com> Content-Language: en-US From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= Autocrypt: addr=jgross@suse.com; keydata= xsBNBFOMcBYBCACgGjqjoGvbEouQZw/ToiBg9W98AlM2QHV+iNHsEs7kxWhKMjrioyspZKOB ycWxw3ie3j9uvg9EOB3aN4xiTv4qbnGiTr3oJhkB1gsb6ToJQZ8uxGq2kaV2KL9650I1SJve dYm8Of8Zd621lSmoKOwlNClALZNew72NjJLEzTalU1OdT7/i1TXkH09XSSI8mEQ/ouNcMvIJ NwQpd369y9bfIhWUiVXEK7MlRgUG6MvIj6Y3Am/BBLUVbDa4+gmzDC9ezlZkTZG2t14zWPvx XP3FAp2pkW0xqG7/377qptDmrk42GlSKN4z76ELnLxussxc7I2hx18NUcbP8+uty4bMxABEB AAHNH0p1ZXJnZW4gR3Jvc3MgPGpncm9zc0BzdXNlLmNvbT7CwHkEEwECACMFAlOMcK8CGwMH CwkIBwMCAQYVCAIJCgsEFgIDAQIeAQIXgAAKCRCw3p3WKL8TL8eZB/9G0juS/kDY9LhEXseh mE9U+iA1VsLhgDqVbsOtZ/S14LRFHczNd/Lqkn7souCSoyWsBs3/wO+OjPvxf7m+Ef+sMtr0 G5lCWEWa9wa0IXx5HRPW/ScL+e4AVUbL7rurYMfwCzco+7TfjhMEOkC+va5gzi1KrErgNRHH kg3PhlnRY0Udyqx++UYkAsN4TQuEhNN32MvN0Np3WlBJOgKcuXpIElmMM5f1BBzJSKBkW0Jc Wy3h2Wy912vHKpPV/Xv7ZwVJ27v7KcuZcErtptDevAljxJtE7aJG6WiBzm+v9EswyWxwMCIO RoVBYuiocc51872tRGywc03xaQydB+9R7BHPzsBNBFOMcBYBCADLMfoA44MwGOB9YT1V4KCy vAfd7E0BTfaAurbG+Olacciz3yd09QOmejFZC6AnoykydyvTFLAWYcSCdISMr88COmmCbJzn sHAogjexXiif6ANUUlHpjxlHCCcELmZUzomNDnEOTxZFeWMTFF9Rf2k2F0Tl4E5kmsNGgtSa aMO0rNZoOEiD/7UfPP3dfh8JCQ1VtUUsQtT1sxos8Eb/HmriJhnaTZ7Hp3jtgTVkV0ybpgFg w6WMaRkrBh17mV0z2ajjmabB7SJxcouSkR0hcpNl4oM74d2/VqoW4BxxxOD1FcNCObCELfIS auZx+XT6s+CE7Qi/c44ibBMR7hyjdzWbABEBAAHCwF8EGAECAAkFAlOMcBYCGwwACgkQsN6d 1ii/Ey9D+Af/WFr3q+bg/8v5tCknCtn92d5lyYTBNt7xgWzDZX8G6/pngzKyWfedArllp0Pn fgIXtMNV+3t8Li1Tg843EXkP7+2+CQ98MB8XvvPLYAfW8nNDV85TyVgWlldNcgdv7nn1Sq8g HwB2BHdIAkYce3hEoDQXt/mKlgEGsLpzJcnLKimtPXQQy9TxUaLBe9PInPd+Ohix0XOlY+Uk QFEx50Ki3rSDl2Zt2tnkNYKUCvTJq7jvOlaPd6d/W0tZqpyy7KVay+K4aMobDsodB3dvEAs6 ScCnh03dDAFgIq5nsB11j3KPKdVoPlfucX2c7kGNH+LUMbzqV6beIENfNexkOfxHfw== In-Reply-To: Content-Type: multipart/signed; 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name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- wsB5BAABCAAjFiEEhRJncuj2BJSl0Jf3sN6d1ii/Ey8FAmhuYuEFAwAAAAAACgkQsN6d1ii/Ey9e hQgAi96vwkgRrHDwYrHU6SdxKaBwE2i3WQH6hwMDGTDio1tSzfLoOkxcJ8P9RnP0S52/kVM5cVKZ HBLtofuXsM8cfeP7D86EA96ZdHNkM3XAHW05qAAhsIbp2o6gleabSWR1So9XGzBBdxmSHgxl9OVn zSedhBACw8GeQuzgT0HYzQN1ibjZyyGunwLnUlRUKddkSb5DeLl5S5xhHORsIOkKNCWFHiqLJG51 7fTPZQ7Nn9ahh3zWZlTaFhPtY+rouVa2MjG52i8YjvXD+Y6E9FII3wPXgdRLyEGvXLE7OD56Z+9x sfqylUEKXbZHAsfDAVtinIFOloKvA40Gb3fenXHR6g== =/4rt -----END PGP SIGNATURE----- --------------qKIgX27ZuyYmM0rFYb1chl0U-- From minios-devel-bounces@lists.xenproject.org Wed Jul 09 14:26:32 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 09 Jul 2025 14:26:32 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1038293.1410786 (Exim 4.92) (envelope-from ) id 1uZVkk-00053M-LF; Wed, 09 Jul 2025 14:26:30 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1038293.1410786; 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Wed, 9 Jul 2025 14:26:26 +0000 (UTC) Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 14DCD136DC; Wed, 9 Jul 2025 14:26:26 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 4vsiAxJ8bmgkbgAAD6G6ig (envelope-from ); Wed, 09 Jul 2025 14:26:26 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: b2ea0b2e-5cd0-11f0-b894-0df219b8e170 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752071186; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Jul 2025 00:36:42.1694 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d9ca76cd-bfde-4501-8700-08ddc01301b6 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN1PEPF00004689.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4437 On 2025-07-02 04:12, Juergen Gross wrote: > Especially for support of Xenstore-stubdom live update some memory must > be handed over to the new kernel without moving it around: as the > 9pfs device used for storing and retrieving the state of Xenstore > needs to be kept operational across kexec (it can't be reopened due to > Xenstore not being available without access to the device), the ring > pages need to be accessible via active grants by the backend all the > time. > > Add the basic support for that by reserving a pre-defined number of > memory pages at the top of the memory. This memory area will be > handed over to the new kernel via specifying it as a module in > struct hvm_start_info. > > The contents of the memory area are described via a generic table of > contents in the last page of the memory. > > Signed-off-by: Juergen Gross > --- > Config.mk | 2 ++ > arch/x86/kexec.c | 77 +++++++++++++++++++++++++++++++++++++++++++ > arch/x86/mm.c | 18 ++++++++++ > arch/x86/setup.c | 28 ++++++++++++++++ > include/kernel.h | 1 + > include/kexec.h | 45 +++++++++++++++++++++++++ > include/x86/arch_mm.h | 1 + > kexec.c | 3 ++ > mm.c | 6 ++++ > 9 files changed, 181 insertions(+) > > diff --git a/Config.mk b/Config.mk > index b9675e61..0e4e86d8 100644 > --- a/Config.mk > +++ b/Config.mk > @@ -220,6 +220,8 @@ CONFIG-$(lwip) += CONFIG_LWIP > $(foreach i,$(CONFIG-y),$(eval $(i) ?= y)) > $(foreach i,$(CONFIG-n),$(eval $(i) ?= n)) > > +CONFIG-val-$(CONFIG_KEXEC) += CONFIG_KEXEC_MODULE_PAGES > + I don't know Makefiles well enough to review the preceding patch. This doesn't seem to be used? > $(foreach i,$(CONFIG-val-y),$(eval $(i) ?= 0)) > > CONFIG-x += CONFIG_LIBXS > diff --git a/arch/x86/kexec.c b/arch/x86/kexec.c > index 804e7b6d..7fb98473 100644 > --- a/arch/x86/kexec.c > +++ b/arch/x86/kexec.c > @@ -201,10 +201,73 @@ static unsigned long kexec_param_loc; > static unsigned int kexec_param_size; > static unsigned long kexec_param_mem; > > +static struct kexec_module *kexec_check_module(void) > +{ > + unsigned long mod_size; > + unsigned long mod; > + struct kexec_module *module_ptr; > + > + mod = get_module(&mod_size); > + if ( !mod ) > + return NULL; > + /* Size must be a multiple of PAGE_SIZE. */ > + if ( mod_size & ~PAGE_MASK ) > + return NULL; > + > + /* Kxec module description is at start of the last page of the module. */ Kexec > + module_ptr = (void *)(mod + mod_size - (unsigned long)PAGE_SIZE); > + > + /* Check eye catcher. */ > + if ( memcmp(module_ptr->eye_catcher, KEXECMOD_EYECATCHER, > + sizeof(module_ptr->eye_catcher)) ) > + return NULL; > + if ( module_ptr->n_pages != (mod_size >> PAGE_SHIFT) - 1 ) > + return NULL; > + > + return module_ptr; > +} > +#define min(a, b) ((a) < (b) ? (a) : (b)) > +void kexec_module(unsigned long start_pfn, unsigned long max_pfn) > +{ > + /* Reuse already existing kexec module. */ > + mod_ptr = kexec_check_module(); > + if ( !mod_ptr && CONFIG_KEXEC_MODULE_PAGES ) What if CONFIG_KEXEC_MODULE_PAGES changes between the old and the new stubdom? > + { > + max_pfn = min(max_pfn, PHYS_PFN(0xffffffff)); > + > + iterate_memory_range(PFN_PHYS(start_pfn), PFN_PHYS(max_pfn), > + get_mod_addr); > + BUG_ON(!kexec_mod_start); > + > + mod_ptr = (void *)(kexec_mod_start + > + ((CONFIG_KEXEC_MODULE_PAGES - 1) << PAGE_SHIFT)); > + memset(mod_ptr, 0, PAGE_SIZE); > + memcpy(mod_ptr->eye_catcher, KEXECMOD_EYECATCHER, > + sizeof(mod_ptr->eye_catcher)); > + mod_ptr->n_pages = CONFIG_KEXEC_MODULE_PAGES - 1; > + memset(mod_ptr->pg2rec, KEXECMOD_PG_FREE, mod_ptr->n_pages); I was wondering about a BUILD_BUG_ON for CONFIG_KEXEC_MODULE_PAGES versus some limit but I can't think of one. > + mod_ptr->recs_off = sizeof(struct kexec_module) + > + CONFIG_KEXEC_MODULE_PAGES + (mod_ptr->n_pages & 1); mod_ptr->n_pages & 1 is to ensure 16bit alignment? mod_ptr->n_pages = CONFIG_KEXEC_MODULE_PAGES - 1, and pg2rec is n_pages, so using CONFIG_KEXEC_MODULE_PAGES makes this off by 1? > + > + set_reserved_range(kexec_mod_start, (unsigned long)mod_ptr + PAGE_SIZE); > + } > +} > + > @@ -252,6 +316,19 @@ int kexec_get_entry(const char *cmdline) > info->memmap_entries = mmap - (struct hvm_memmap_table_entry *)next; > next = mmap; > > + if ( mod_ptr ) > + { > + mod = next; > + memset(mod, 0, sizeof(*mod)); > + info->nr_modules = 1; > + info->modlist_paddr = kexec_param_loc + Looking at this again, I wonder if kexec_param_loc would be better named _pa or _paddr. > + (unsigned long)next - kexec_param_mem; > + mod->paddr = kexec_mod_start; > + mod->size = PFN_PHYS(mod_ptr->n_pages + 1); > + mod->cmdline_paddr = 0; > + next = mod + 1; > + } > + > info->cmdline_paddr = kexec_param_loc + (unsigned long)next - kexec_param_mem; > strcpy(next, cmdline); > > diff --git a/include/kexec.h b/include/kexec.h > index b89c3000..0200005f 100644 > --- a/include/kexec.h > +++ b/include/kexec.h > @@ -2,6 +2,48 @@ > #define _KEXEC_H > #include > > +/* > + * Kexec module used to hand over memory across kexec(). > + * > + * This is an ABI which should be modified only in a compatible way. > + * struct kexec_module is located at the start of the last page of the module. Why is kexec_module, which seems like a header, placed in the last page? > + * > + * The module can contain data/pages of multiple users. Each user has an own > + * record which layout is depending on the user. Records are linked via a table > + * of record offsets. > + * > + * All admin data (struct kexec_module, record offset table and records) must > + * fit into the last page of the module. > + */ > +struct kexec_module { > + uint8_t eye_catcher[8]; > +#define KEXECMOD_EYECATCHER "KexecMem" > + uint16_t n_pages; /* Number of allocatable pages in the module. */ > + uint16_t n_records; /* Size of record table (max. 255). */ > +#define KEXECMOD_REC_MAX 255 > + uint16_t recs_off; /* Offset to record table from start of page. */ > + /* The record table is an array of */ > + /* struct kexec_module_rec. */ > + uint8_t pg2rec[]; /* One entry per allocatable module page, value */ > + /* is record number (starting from 0) associated */ > + /* with it. Free pages have value 255. */ This reads like it is 1 page per record... > +#define KEXECMOD_PG_FREE 255 > +}; > + > +struct kexec_module_rec { > + uint16_t offset; /* Offset to record from start of page. */ ... but then why would you need an offset? How do you identify which "page" or do you mean from the start of the module? > + uint8_t type; /* Type of record. */ > +#define KEXECMOD_REC_NONE 0 > + uint8_t size; /* Size of record. */ > +}; > + > +#ifndef CONFIG_KEXEC_MODULE_PAGES > +#define CONFIG_KEXEC_MODULE_PAGES 0 > +#endif > + > +extern unsigned long kexec_mod_start; > +extern struct kexec_module *mod_ptr; > + > /* One element of kexec actions (last element must have action KEXEC_CALL): */ > struct kexec_action { > enum { > diff --git a/kexec.c b/kexec.c > index 2607c819..ded29882 100644 > --- a/kexec.c > +++ b/kexec.c > @@ -250,3 +250,6 @@ int kexec_add_action(int action, void *dest, void *src, unsigned int len) > > return 0; > } > + > +unsigned long kexec_mod_start; > +struct kexec_module *mod_ptr; Personally, I find it a little unusual to add variables at the end of the file. But it's fine and you don't have to change it. 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Thu, 10 Jul 2025 23:24:45 -0700 (PDT) Message-ID: <6102acd3-b4c0-45a1-87d1-8f4888c662cd@suse.com> Date: Fri, 11 Jul 2025 08:24:38 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 11/19] mini-os: config: add support for config items with numerical values To: Juergen Gross Cc: samuel.thibault@ens-lyon.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org References: <20250702081254.14383-1-jgross@suse.com> <20250702081254.14383-12-jgross@suse.com> Content-Language: en-US From: Jan Beulich Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: <20250702081254.14383-12-jgross@suse.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 02.07.2025 10:12, Juergen Gross wrote: > Add support for a Mini-OS config file containing config items with > numerical values, e.g. CONFIG_FOO=7. > > Signed-off-by: Juergen Gross Reviewed-by: Jan Beulich Albeit I'm puzzled by the use in the next patch. Besides me perhaps simply not knowing where the new CONFIG_* would actually have its value set, I wonder why, ... > --- a/Config.mk > +++ b/Config.mk > @@ -178,6 +178,7 @@ endif > # CONFIG-y contains all items defaulting to "y" > # CONFIG-n contains all items defaulting to "n" > # CONFIG-x contains all items being calculated if not set explicitly > +# CONFIG-val-y contains all items with numerical values, defaulting to 0 > CONFIG-y += CONFIG_START_NETWORK > CONFIG-y += CONFIG_SPARSE_BSS > CONFIG-y += CONFIG_BLKFRONT > @@ -219,6 +220,8 @@ CONFIG-$(lwip) += CONFIG_LWIP > $(foreach i,$(CONFIG-y),$(eval $(i) ?= y)) > $(foreach i,$(CONFIG-n),$(eval $(i) ?= n)) > > +$(foreach i,$(CONFIG-val-y),$(eval $(i) ?= 0)) ... with this and ... > @@ -226,6 +229,7 @@ CONFIG-all := $(CONFIG-y) $(CONFIG-n) $(CONFIG-x) > > # Export config items as compiler directives > $(foreach i,$(CONFIG-all),$(eval DEFINES-$($(i)) += -D$(i))) > +$(foreach i,$(CONFIG-val-y),$(eval DEFINES-y += -D$(i)=$($(i)))) ... this, kexec.h still needs to have a fallback #define there. 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00:49:21 -0700 (PDT) Message-ID: <82e521d2-9886-4540-8e8c-7096fd34451e@suse.com> Date: Fri, 11 Jul 2025 09:49:20 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 12/19] mini-os: kexec: add support for handing over some memory across kexec To: Jason Andryuk , minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org References: <20250702081254.14383-1-jgross@suse.com> <20250702081254.14383-13-jgross@suse.com> Content-Language: en-US From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= Autocrypt: addr=jgross@suse.com; keydata= xsBNBFOMcBYBCACgGjqjoGvbEouQZw/ToiBg9W98AlM2QHV+iNHsEs7kxWhKMjrioyspZKOB ycWxw3ie3j9uvg9EOB3aN4xiTv4qbnGiTr3oJhkB1gsb6ToJQZ8uxGq2kaV2KL9650I1SJve dYm8Of8Zd621lSmoKOwlNClALZNew72NjJLEzTalU1OdT7/i1TXkH09XSSI8mEQ/ouNcMvIJ NwQpd369y9bfIhWUiVXEK7MlRgUG6MvIj6Y3Am/BBLUVbDa4+gmzDC9ezlZkTZG2t14zWPvx XP3FAp2pkW0xqG7/377qptDmrk42GlSKN4z76ELnLxussxc7I2hx18NUcbP8+uty4bMxABEB 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attachment; filename="OpenPGP_0xB0DE9DD628BF132F.asc" Content-Description: OpenPGP public key Content-Transfer-Encoding: quoted-printable -----BEGIN PGP PUBLIC KEY BLOCK----- xsBNBFOMcBYBCACgGjqjoGvbEouQZw/ToiBg9W98AlM2QHV+iNHsEs7kxWhKMjri oyspZKOBycWxw3ie3j9uvg9EOB3aN4xiTv4qbnGiTr3oJhkB1gsb6ToJQZ8uxGq2 kaV2KL9650I1SJvedYm8Of8Zd621lSmoKOwlNClALZNew72NjJLEzTalU1OdT7/i 1TXkH09XSSI8mEQ/ouNcMvIJNwQpd369y9bfIhWUiVXEK7MlRgUG6MvIj6Y3Am/B BLUVbDa4+gmzDC9ezlZkTZG2t14zWPvxXP3FAp2pkW0xqG7/377qptDmrk42GlSK N4z76ELnLxussxc7I2hx18NUcbP8+uty4bMxABEBAAHNHEp1ZXJnZW4gR3Jvc3Mg PGpnQHBmdXBmLm5ldD7CwHkEEwECACMFAlOMcBYCGwMHCwkIBwMCAQYVCAIJCgsE FgIDAQIeAQIXgAAKCRCw3p3WKL8TL0KdB/93FcIZ3GCNwFU0u3EjNbNjmXBKDY4F UGNQH2lvWAUy+dnyThpwdtF/jQ6j9RwE8VP0+NXcYpGJDWlNb9/JmYqLiX2Q3Tye vpB0CA3dbBQp0OW0fgCetToGIQrg0MbD1C/sEOv8Mr4NAfbauXjZlvTj30H2jO0u +6WGM6nHwbh2l5O8ZiHkH32iaSTfN7Eu5RnNVUJbvoPHZ8SlM4KWm8rG+lIkGurq qu5gu8q8ZMKdsdGC4bBxdQKDKHEFExLJK/nRPFmAuGlId1E3fe10v5QL+qHI3EIP 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Fri, 11 Jul 2025 00:56:38 -0700 (PDT) Message-ID: <4f5c5d7f-2526-4f5a-b75d-8380770ee7c4@suse.com> Date: Fri, 11 Jul 2025 09:56:37 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 11/19] mini-os: config: add support for config items with numerical values To: Jan Beulich Cc: samuel.thibault@ens-lyon.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org References: <20250702081254.14383-1-jgross@suse.com> <20250702081254.14383-12-jgross@suse.com> <6102acd3-b4c0-45a1-87d1-8f4888c662cd@suse.com> Content-Language: en-US From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= Autocrypt: addr=jgross@suse.com; keydata= xsBNBFOMcBYBCACgGjqjoGvbEouQZw/ToiBg9W98AlM2QHV+iNHsEs7kxWhKMjrioyspZKOB ycWxw3ie3j9uvg9EOB3aN4xiTv4qbnGiTr3oJhkB1gsb6ToJQZ8uxGq2kaV2KL9650I1SJve dYm8Of8Zd621lSmoKOwlNClALZNew72NjJLEzTalU1OdT7/i1TXkH09XSSI8mEQ/ouNcMvIJ NwQpd369y9bfIhWUiVXEK7MlRgUG6MvIj6Y3Am/BBLUVbDa4+gmzDC9ezlZkTZG2t14zWPvx XP3FAp2pkW0xqG7/377qptDmrk42GlSKN4z76ELnLxussxc7I2hx18NUcbP8+uty4bMxABEB AAHNH0p1ZXJnZW4gR3Jvc3MgPGpncm9zc0BzdXNlLmNvbT7CwHkEEwECACMFAlOMcK8CGwMH CwkIBwMCAQYVCAIJCgsEFgIDAQIeAQIXgAAKCRCw3p3WKL8TL8eZB/9G0juS/kDY9LhEXseh mE9U+iA1VsLhgDqVbsOtZ/S14LRFHczNd/Lqkn7souCSoyWsBs3/wO+OjPvxf7m+Ef+sMtr0 G5lCWEWa9wa0IXx5HRPW/ScL+e4AVUbL7rurYMfwCzco+7TfjhMEOkC+va5gzi1KrErgNRHH kg3PhlnRY0Udyqx++UYkAsN4TQuEhNN32MvN0Np3WlBJOgKcuXpIElmMM5f1BBzJSKBkW0Jc Wy3h2Wy912vHKpPV/Xv7ZwVJ27v7KcuZcErtptDevAljxJtE7aJG6WiBzm+v9EswyWxwMCIO RoVBYuiocc51872tRGywc03xaQydB+9R7BHPzsBNBFOMcBYBCADLMfoA44MwGOB9YT1V4KCy vAfd7E0BTfaAurbG+Olacciz3yd09QOmejFZC6AnoykydyvTFLAWYcSCdISMr88COmmCbJzn sHAogjexXiif6ANUUlHpjxlHCCcELmZUzomNDnEOTxZFeWMTFF9Rf2k2F0Tl4E5kmsNGgtSa aMO0rNZoOEiD/7UfPP3dfh8JCQ1VtUUsQtT1sxos8Eb/HmriJhnaTZ7Hp3jtgTVkV0ybpgFg w6WMaRkrBh17mV0z2ajjmabB7SJxcouSkR0hcpNl4oM74d2/VqoW4BxxxOD1FcNCObCELfIS auZx+XT6s+CE7Qi/c44ibBMR7hyjdzWbABEBAAHCwF8EGAECAAkFAlOMcBYCGwwACgkQsN6d 1ii/Ey9D+Af/WFr3q+bg/8v5tCknCtn92d5lyYTBNt7xgWzDZX8G6/pngzKyWfedArllp0Pn fgIXtMNV+3t8Li1Tg843EXkP7+2+CQ98MB8XvvPLYAfW8nNDV85TyVgWlldNcgdv7nn1Sq8g HwB2BHdIAkYce3hEoDQXt/mKlgEGsLpzJcnLKimtPXQQy9TxUaLBe9PInPd+Ohix0XOlY+Uk QFEx50Ki3rSDl2Zt2tnkNYKUCvTJq7jvOlaPd6d/W0tZqpyy7KVay+K4aMobDsodB3dvEAs6 ScCnh03dDAFgIq5nsB11j3KPKdVoPlfucX2c7kGNH+LUMbzqV6beIENfNexkOfxHfw== In-Reply-To: <6102acd3-b4c0-45a1-87d1-8f4888c662cd@suse.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------U0O0Czs40YRC0iw06hu20jza" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------U0O0Czs40YRC0iw06hu20jza Content-Type: multipart/mixed; boundary="------------0cngMd1cpa6ZpB4rN5j1hhMk"; protected-headers="v1" From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= To: Jan Beulich Cc: samuel.thibault@ens-lyon.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Message-ID: <4f5c5d7f-2526-4f5a-b75d-8380770ee7c4@suse.com> Subject: Re: [MINI-OS PATCH 11/19] mini-os: config: add support for config items with numerical values References: <20250702081254.14383-1-jgross@suse.com> <20250702081254.14383-12-jgross@suse.com> <6102acd3-b4c0-45a1-87d1-8f4888c662cd@suse.com> In-Reply-To: <6102acd3-b4c0-45a1-87d1-8f4888c662cd@suse.com> Autocrypt-Gossip: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJ3BBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AAIQkQoDSui/t3IH4WIQQ+pJkfkcoLMCa4X6CgNK6L+3cgfgn7AJ9DmMd0SMJE ePbc7/m22D2v04iu7ACffXTdZQhNl557tJuDXZSBxDmW/tLOwU0EWTecRBAIAIK5OMKMU5R2 Lk2bbjgX7vyQuCFFyKf9rC/4itNwhYWFSlKzVj3WJBDsoi2KvPm7AI+XB6NIkNAkshL5C0kd pcNd5Xo0jRR5/WE/bT7LyrJ0OJWS/qUit5eNNvsO+SxGAk28KRa1ieVLeZi9D03NL0+HIAtZ tecfqwgl3Y72UpLUyt+r7LQhcI/XR5IUUaD4C/chB4Vq2QkDKO7Q8+2HJOrFIjiVli4lU+Sf OBp64m//Y1xys++Z4ODoKh7tkh5DxiO3QBHG7bHK0CSQsJ6XUvPVYubAuy1XfSDzSeSBl//C v78Fclb+gi9GWidSTG/4hsEzd1fY5XwCZG/XJJY9M/sAAwUH/09Ar9W2U1Qm+DwZeP2ii3Ou 14Z9VlVVPhcEmR/AFykL9dw/OV2O/7cdi52+l00reUu6Nd4Dl8s4f5n8b1YFzmkVVIyhwjvU jxtPyUgDOt6DRa+RaDlXZZmxQyWcMv2anAgYWGVszeB8Myzsw8y7xhBEVV1S+1KloCzw4V8Z DSJrcsZlyMDoiTb7FyqxwQnM0f6qHxWbmOOnbzJmBqpNpFuDcz/4xNsymJylm6oXiucHQBAP Xb/cE1YNHpuaH4SRhIxwQilCYEznWowQphNAbJtEKOmcocY7EbSt8VjXTzmYENkIfkrHRyXQ dUm5AoL51XZljkCqNwrADGkTvkwsWSvCSQQYEQIACQUCWTecRAIbDAAKCRCgNK6L+3cgfuef AJ9wlZQNQUp0KwEf8Tl37RmcxCL4bQCcC5alCSMzUBJ5DBIcR4BY+CyQFAs= --------------0cngMd1cpa6ZpB4rN5j1hhMk Content-Type: multipart/mixed; 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name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- wsB5BAABCAAjFiEEhRJncuj2BJSl0Jf3sN6d1ii/Ey8FAmhww7UFAwAAAAAACgkQsN6d1ii/Ey8n cAf7BmL1Jrm/ouS3nEi+N8jot9CbjeQj3sILxiO1ahn/qu9lAiO0N9p5ow7ltixWDOeNsGh1OFMB nyCc2mVqDMIQBkhHhm2y+Du3fo4Hv5NQM5ojU0HkyA1kUCIQrwvpNfgalGvpWh4dM/D70is5royf 8ywJAfEui1H4M84gVOJWCuhqyYMZkZBSSzvz46Tvk2jmioZ36MLs0VVhXhtbCB7MgxDw31AGHyXU UaPKNENoOF70CYyLMev43E5PnWiefoAi4NcGcYEZ/FzZR7Dx8wB7lNxz2UkBfdBgv/uIxTDeCczd xWE8bfZ+Nt6F6QDlnVU8MnCDtL09JdF8Nlf/xZAw1w== =7eN8 -----END PGP SIGNATURE----- --------------U0O0Czs40YRC0iw06hu20jza-- From minios-devel-bounces@lists.xenproject.org Fri Jul 11 12:03:44 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Fri, 11 Jul 2025 12:03:44 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1040821.1412119 (Exim 4.92) (envelope-from ) id 1uaCTc-00047V-Vm; Fri, 11 Jul 2025 12:03:40 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1040821.1412119; 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Fixes: a7d27a7332ba ("mini-os: add memory map service functions") Signed-off-by: Juergen Gross --- e820.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/e820.c b/e820.c index d8cfb1f4..1ffeaf00 100644 --- a/e820.c +++ b/e820.c @@ -365,7 +365,7 @@ unsigned long e820_get_reserved_pfns(int pages) unsigned long last = 0, needed = (long)pages << PAGE_SHIFT; for ( i = 0; i < e820_entries && e820_map[i].addr < last + needed; i++ ) - last = e820_map[i].addr + e820_map[i].size; + last = round_pgup(e820_map[i].addr + e820_map[i].size); if ( i == 0 || e820_map[i - 1].type != E820_TYPE_SOFT_RESERVED ) e820_insert_entry_at(i, last, needed, E820_TYPE_SOFT_RESERVED); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Fri Jul 11 12:27:23 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Fri, 11 Jul 2025 12:27:23 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1040861.1412147 (Exim 4.92) (envelope-from ) id 1uaCqY-0000L3-AB; Fri, 11 Jul 2025 12:27:22 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1040861.1412147; Fri, 11 Jul 2025 12:27:22 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uaCqY-0000JQ-7M; Fri, 11 Jul 2025 12:27:22 +0000 Received: by outflank-mailman (input) for mailman id 1040861; Fri, 11 Jul 2025 12:27:21 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uaCqX-0000GN-Cd for minios-devel@lists.xenproject.org; Fri, 11 Jul 2025 12:27:21 +0000 Received: from mail-wr1-x430.google.com (mail-wr1-x430.google.com [2a00:1450:4864:20::430]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 62a6ee0f-5e52-11f0-a318-13f23c93f187; Fri, 11 Jul 2025 14:27:18 +0200 (CEST) Received: by mail-wr1-x430.google.com with SMTP id ffacd0b85a97d-3a531fcaa05so1153680f8f.3 for ; Fri, 11 Jul 2025 05:27:18 -0700 (PDT) Received: from [10.156.60.236] (ip-037-024-206-209.um08.pools.vodafone-ip.de. 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Fri, 11 Jul 2025 05:27:17 -0700 (PDT) Message-ID: <9d98b6bd-e325-4cfb-b4b8-c6a5321e02c6@suse.com> Date: Fri, 11 Jul 2025 14:27:10 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH] e820: fix e820_get_reserved_pfns() to reserve page aligned area To: Juergen Gross Cc: samuel.thibault@ens-lyon.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org References: <20250711120333.23745-1-jgross@suse.com> Content-Language: en-US From: Jan Beulich Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: <20250711120333.23745-1-jgross@suse.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 11.07.2025 14:03, Juergen Gross wrote: > e820_get_reserved_pfns() needs to make sure to reserve only page > aligned memory areas. > > Fixes: a7d27a7332ba ("mini-os: add memory map service functions") > Signed-off-by: Juergen Gross Reviewed-by: Jan Beulich From minios-devel-bounces@lists.xenproject.org Mon Jul 14 14:02:39 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 14 Jul 2025 14:02:39 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1042861.1412934 (Exim 4.92) (envelope-from ) id 1ubJlO-00050h-Ah; Mon, 14 Jul 2025 14:02:38 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1042861.1412934; Mon, 14 Jul 2025 14:02:38 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubJlO-00050a-80; Mon, 14 Jul 2025 14:02:38 +0000 Received: by outflank-mailman (input) for mailman id 1042861; 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Mon, 14 Jul 2025 07:02:32 -0700 (PDT) Message-ID: Date: Mon, 14 Jul 2025 16:02:25 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH] e820: fix e820_get_reserved_pfns() to reserve page aligned area To: Juergen Gross Cc: samuel.thibault@ens-lyon.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org References: <20250711120333.23745-1-jgross@suse.com> Content-Language: en-US From: Jan Beulich Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: <20250711120333.23745-1-jgross@suse.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 11.07.2025 14:03, Juergen Gross wrote: > e820_get_reserved_pfns() needs to make sure to reserve only page > aligned memory areas. > > Fixes: a7d27a7332ba ("mini-os: add memory map service functions") > Signed-off-by: Juergen Gross I've committed this, but ... > --- a/e820.c > +++ b/e820.c > @@ -365,7 +365,7 @@ unsigned long e820_get_reserved_pfns(int pages) > unsigned long last = 0, needed = (long)pages << PAGE_SHIFT; > > for ( i = 0; i < e820_entries && e820_map[i].addr < last + needed; i++ ) > - last = e820_map[i].addr + e820_map[i].size; > + last = round_pgup(e820_map[i].addr + e820_map[i].size); > > if ( i == 0 || e820_map[i - 1].type != E820_TYPE_SOFT_RESERVED ) > e820_insert_entry_at(i, last, needed, E820_TYPE_SOFT_RESERVED); ... I had to resolve fuzz here: There's no E820_TYPE_SOFT_RESERVED in the upstream tree, afaics. I just hope I didn't screw up ... 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Mon, 14 Jul 2025 07:08:22 -0700 (PDT) Message-ID: Date: Mon, 14 Jul 2025 16:08:20 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH] e820: fix e820_get_reserved_pfns() to reserve page aligned area To: Jan Beulich Cc: samuel.thibault@ens-lyon.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org References: <20250711120333.23745-1-jgross@suse.com> Content-Language: en-US From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= Autocrypt: addr=jgross@suse.com; keydata= xsBNBFOMcBYBCACgGjqjoGvbEouQZw/ToiBg9W98AlM2QHV+iNHsEs7kxWhKMjrioyspZKOB ycWxw3ie3j9uvg9EOB3aN4xiTv4qbnGiTr3oJhkB1gsb6ToJQZ8uxGq2kaV2KL9650I1SJve dYm8Of8Zd621lSmoKOwlNClALZNew72NjJLEzTalU1OdT7/i1TXkH09XSSI8mEQ/ouNcMvIJ NwQpd369y9bfIhWUiVXEK7MlRgUG6MvIj6Y3Am/BBLUVbDa4+gmzDC9ezlZkTZG2t14zWPvx XP3FAp2pkW0xqG7/377qptDmrk42GlSKN4z76ELnLxussxc7I2hx18NUcbP8+uty4bMxABEB AAHNH0p1ZXJnZW4gR3Jvc3MgPGpncm9zc0BzdXNlLmNvbT7CwHkEEwECACMFAlOMcK8CGwMH CwkIBwMCAQYVCAIJCgsEFgIDAQIeAQIXgAAKCRCw3p3WKL8TL8eZB/9G0juS/kDY9LhEXseh mE9U+iA1VsLhgDqVbsOtZ/S14LRFHczNd/Lqkn7souCSoyWsBs3/wO+OjPvxf7m+Ef+sMtr0 G5lCWEWa9wa0IXx5HRPW/ScL+e4AVUbL7rurYMfwCzco+7TfjhMEOkC+va5gzi1KrErgNRHH kg3PhlnRY0Udyqx++UYkAsN4TQuEhNN32MvN0Np3WlBJOgKcuXpIElmMM5f1BBzJSKBkW0Jc Wy3h2Wy912vHKpPV/Xv7ZwVJ27v7KcuZcErtptDevAljxJtE7aJG6WiBzm+v9EswyWxwMCIO RoVBYuiocc51872tRGywc03xaQydB+9R7BHPzsBNBFOMcBYBCADLMfoA44MwGOB9YT1V4KCy vAfd7E0BTfaAurbG+Olacciz3yd09QOmejFZC6AnoykydyvTFLAWYcSCdISMr88COmmCbJzn sHAogjexXiif6ANUUlHpjxlHCCcELmZUzomNDnEOTxZFeWMTFF9Rf2k2F0Tl4E5kmsNGgtSa aMO0rNZoOEiD/7UfPP3dfh8JCQ1VtUUsQtT1sxos8Eb/HmriJhnaTZ7Hp3jtgTVkV0ybpgFg w6WMaRkrBh17mV0z2ajjmabB7SJxcouSkR0hcpNl4oM74d2/VqoW4BxxxOD1FcNCObCELfIS auZx+XT6s+CE7Qi/c44ibBMR7hyjdzWbABEBAAHCwF8EGAECAAkFAlOMcBYCGwwACgkQsN6d 1ii/Ey9D+Af/WFr3q+bg/8v5tCknCtn92d5lyYTBNt7xgWzDZX8G6/pngzKyWfedArllp0Pn fgIXtMNV+3t8Li1Tg843EXkP7+2+CQ98MB8XvvPLYAfW8nNDV85TyVgWlldNcgdv7nn1Sq8g HwB2BHdIAkYce3hEoDQXt/mKlgEGsLpzJcnLKimtPXQQy9TxUaLBe9PInPd+Ohix0XOlY+Uk QFEx50Ki3rSDl2Zt2tnkNYKUCvTJq7jvOlaPd6d/W0tZqpyy7KVay+K4aMobDsodB3dvEAs6 ScCnh03dDAFgIq5nsB11j3KPKdVoPlfucX2c7kGNH+LUMbzqV6beIENfNexkOfxHfw== In-Reply-To: Content-Type: multipart/signed; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Jul 2025 21:33:05.5256 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 81fb7e99-7ed9-49f8-1210-08ddc31e04ef X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF0001AB74.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB7500 On 2025-07-11 03:49, Jürgen Groß wrote: > On 11.07.25 01:21, Jason Andryuk wrote: >> On 2025-07-02 04:12, Juergen Gross wrote: >>> Especially for support of Xenstore-stubdom live update some memory must >>> be handed over to the new kernel without moving it around: as the >>> 9pfs device used for storing and retrieving the state of Xenstore >>> needs to be kept operational across kexec (it can't be reopened due to >>> Xenstore not being available without access to the device), the ring >>> pages need to be accessible via active grants by the backend all the >>> time. >>> >>> Add the basic support for that by reserving a pre-defined number of >>> memory pages at the top of the memory. This memory area will be >>> handed over to the new kernel via specifying it as a module in >>> struct hvm_start_info. >>> >>> The contents of the memory area are described via a generic table of >>> contents in the last page of the memory. >>> >>> Signed-off-by: Juergen Gross >>> diff --git a/Config.mk b/Config.mk >>> index b9675e61..0e4e86d8 100644 >>> --- a/Config.mk >>> +++ b/Config.mk >>> @@ -220,6 +220,8 @@ CONFIG-$(lwip) += CONFIG_LWIP >>>   $(foreach i,$(CONFIG-y),$(eval $(i) ?= y)) >>>   $(foreach i,$(CONFIG-n),$(eval $(i) ?= n)) >>> +CONFIG-val-$(CONFIG_KEXEC) += CONFIG_KEXEC_MODULE_PAGES >>> + >> >> I don't know Makefiles well enough to review the preceding patch. >> This doesn't seem to be used? > > It is. Oh, so setting CONFIG-val-y, through the Makefile magic, creates -DCONFIG_KEXEC_MODULE_PAGES=$n I said I didn't know Makefiles well :) >> >>>   $(foreach i,$(CONFIG-val-y),$(eval $(i) ?= 0)) >>>   CONFIG-x += CONFIG_LIBXS >>> +    module_ptr = (void *)(mod + mod_size - (unsigned long)PAGE_SIZE); >>> + >>> +    /* Check eye catcher. */ >>> +    if ( memcmp(module_ptr->eye_catcher, KEXECMOD_EYECATCHER, >>> +                sizeof(module_ptr->eye_catcher)) ) >>> +        return NULL; >>> +    if ( module_ptr->n_pages != (mod_size >> PAGE_SHIFT) - 1 ) >>> +        return NULL; >>> + >>> +    return module_ptr; >>> +} >> >>> +#define min(a, b) ((a) < (b) ? (a) : (b)) >>> +void kexec_module(unsigned long start_pfn, unsigned long max_pfn) >>> +{ >>> +    /* Reuse already existing kexec module. */ >>> +    mod_ptr = kexec_check_module(); >>> +    if ( !mod_ptr && CONFIG_KEXEC_MODULE_PAGES ) >> >> What if CONFIG_KEXEC_MODULE_PAGES changes between the old and the new >> stubdom? > > Right now this wouldn't really matter. The CONFIG value is used > only for sizing the module if we are not started via kexec(). When I wrote this I was thinking of: A -- kexec --> B -- kexec --> C A: CONFIG_KEXEC_MODULE_PAGES=4 B: CONFIG_KEXEC_MODULE_PAGES=6 When B is running, it has the 4 pages from A, but it expects 6 available for its use.... >>> diff --git a/include/kexec.h b/include/kexec.h >>> index b89c3000..0200005f 100644 >>> --- a/include/kexec.h >>> +++ b/include/kexec.h >>> @@ -2,6 +2,48 @@ >>>   #define _KEXEC_H >>>   #include >>> +/* >>> + * Kexec module used to hand over memory across kexec(). >>> + * >>> + * This is an ABI which should be modified only in a compatible way. >>> + * struct kexec_module is located at the start of the last page of >>> the module. >> >> Why is kexec_module, which seems like a header, placed in the last page? > > In case we ever need to grow the module (e.g. when adding new data > to it and with that having to handle different CONFIG_KEXEC_MODULE_PAGES > values between old and new build), it will be easier, as the module will > normally be located at the end of the usable memory, so we wouldn't have > to move the struct kexec_module around. .. and this avoids that issue since the extra pages can be grabbed without moving struct kexec_module. >> >>> + * >>> + * The module can contain data/pages of multiple users. Each user >>> has an own >>> + * record which layout is depending on the user. Records are linked >>> via a table >>> + * of record offsets. >>> + * >>> + * All admin data (struct kexec_module, record offset table and >>> records) must >>> + * fit into the last page of the module. >>> + */ >>> +struct kexec_module { >>> +    uint8_t eye_catcher[8]; >>> +#define KEXECMOD_EYECATCHER "KexecMem" >>> +    uint16_t n_pages;       /* Number of allocatable pages in the >>> module.    */ >>> +    uint16_t n_records;     /* Size of record table (max. >>> 255).              */ >>> +#define KEXECMOD_REC_MAX    255 >>> +    uint16_t recs_off;      /* Offset to record table from start of >>> page.    */ >>> +                            /* The record table is an array >>> of               */ >>> +                            /* struct >>> kexec_module_rec.                      */ >>> +    uint8_t pg2rec[];       /* One entry per allocatable module >>> page, value  */ >>> +                            /* is record number (starting from 0) >>> associated */ >>> +                            /* with it. Free pages have value >>> 255.           */ >> >> This reads like it is 1 page per record... > > No, this means that each used page is associated with a record, but > there can be [0 ... n_pages] associated with each record. Maybe: "Mapping of module pages to associated module record. Allocated pages are indicated by their record number (starting from 0). Free pages have value 255."? >> >>> +#define KEXECMOD_PG_FREE    255 >>> +}; >>> + >>> +struct kexec_module_rec { >>> +    uint16_t offset;        /* Offset to record from start of >>> page.          */ >> >> ... but then why would you need an offset?  How do you identify which >> "page" or do you mean from the start of the module? > > The record itself needs to contain the data for finding the pages > associated with it. See patch 18 for the details of the 9pfs record > added there. > > It will use all 17 allocatable pages from the module (1 for the main > 9pfs shared interface page plus 16 for the shared rings), while the > record itself will hold the grant reference of the 9pfs interface > page, which serves as the key for locating the page itself and the > ring pages. I was missing the overall view. I think I have it now from reading patch 13. From kexec_mod_start, we have: (CONFIG_KEXEC_MODULE_PAGES - 1) pages (allocated as pages - referenced by pg2rec) struct kexec_module *mod_ptr is the start of the final page. pg2rec[n_pages] struct kexec_module_rec mod_recs[n_records] < extra data for each mod_recs found by .offset and .size > I didn't realize the mod_recs were separate from their "extra data", and extra data took up the end of the. If that's correct, I think it would be helpful to describe the overall layout. Thanks, Jason >> >>> +    uint8_t type;           /* Type of >>> record.                               */ >>> +#define KEXECMOD_REC_NONE   0 >>> +    uint8_t size;           /* Size of >>> record.                               */ >>> +}; >>> + >>> +#ifndef CONFIG_KEXEC_MODULE_PAGES >>> +#define CONFIG_KEXEC_MODULE_PAGES 0 >>> +#endif >>> + >>> +extern unsigned long kexec_mod_start; >>> +extern struct kexec_module *mod_ptr; >>> + >>>   /* One element of kexec actions (last element must have action >>> KEXEC_CALL): */ >>>   struct kexec_action { >>>       enum { >> From minios-devel-bounces@lists.xenproject.org Mon Jul 14 21:33:23 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 14 Jul 2025 21:33:23 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1043063.1413180 (Exim 4.92) (envelope-from ) id 1ubQnb-0005hY-M8; Mon, 14 Jul 2025 21:33:23 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1043063.1413180; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Jul 2025 21:33:14.2287 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ca9b573c-ce06-4638-4165-08ddc31e0a1f X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF0001AB74.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN7PPFD6BF22047 On 2025-07-02 04:12, Juergen Gross wrote: > Use struct dev_9pfs for storing the backend path of the device state > in order to avoid code duplication in init_9pfront() and > shutdown_9pfront(). > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Mon Jul 14 21:33:41 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 14 Jul 2025 21:33:41 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1043072.1413189 (Exim 4.92) (envelope-from ) id 1ubQnt-0006K8-RF; 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pr=C Message-ID: Date: Mon, 14 Jul 2025 17:22:52 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Jason Andryuk Subject: Re: [MINI-OS PATCH 15/19] 9pfs: refactor init_9pfront() To: Juergen Gross , , CC: References: <20250702081254.14383-1-jgross@suse.com> <20250702081254.14383-16-jgross@suse.com> Content-Language: en-US In-Reply-To: <20250702081254.14383-16-jgross@suse.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: None (SATLEXMB04.amd.com: jason.andryuk@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS2PEPF00003448:EE_|DM6PR12MB4449:EE_ X-MS-Office365-Filtering-Correlation-Id: ee58331c-6751-4aaf-27de-08ddc31e1450 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|376014|1800799024|36860700013|7053199007; X-Microsoft-Antispam-Message-Info: =?utf-8?B?NG9KYWwwUklqSkJTR3hXaXVmNHdxbHRLNW10bit5Wm9oQjd5amxxZndLRUdq?= =?utf-8?B?TGpQK3V3aWJDRnJYTFZoRlFKenBTdFE1Y1U5eWR0ZThMZVAxM2NVbVZvMzdB?= =?utf-8?B?VzhxWTBCRjcwcGYwaklsM2QvbjdUcjlxZXROMlp1STcrS0YxYjd3dFVlNnRr?= =?utf-8?B?UUF0L2I2VENWcmpkanNsR2ZhdXpaL3RCT3E0VEgzUzNLUXR2Y0crd05jeUcr?= =?utf-8?B?M3VzSmlobjZkSUlVdEVxb0hPdi80Rk93UzZLMlFGdWdqSXJVaXQxOFdmWHRs?= =?utf-8?B?Q280bXoxUVA0dG9WSStqK3ZGOXFqczg4VHpQQmZwRUYzaXlPNFc0dGxQVjlQ?= =?utf-8?B?elN0SWRrRjBwR3dNWERzNk82VmFNQTFoeklZNTB6NGthTGl2QktTL1pvVkpa?= =?utf-8?B?V2d0MW5Ma2VoQkhCN3hPNmFrUHVCK2tDZkNTM3MxNHNvR3YwZzhmS3pwRXpn?= =?utf-8?B?b0ttTFY3OWI3YmlGZ2ZxalZoM3Fwb0Q5QjlnSTN5VkttUEh5RlpnN1lkbHhl?= =?utf-8?B?aUdReU5hR0hjUERJZHNOaHQ2ZzI0ejBUcm42cmJZRlZuWm1GQjVENVRmOHVF?= =?utf-8?B?Mm5INzZmQ2N1WXZaSUhDZ3VESGhYaEVFZmNGN2xnc1FRK0VjNS9NTXRrelgy?= =?utf-8?B?SU1FSFo0S2hadGF0dTl0eUVwUDNqaDFrKzhqaEpBd3FwVlNXaTJQK21mY0pu?= =?utf-8?B?Q0RXUjVZOCtXZlpUejdEVkFpcWd0SnZ5SWNDV09KWVRRQUxva1JQWGlvTzdP?= =?utf-8?B?eWdVRG83ZUlVemtTdWRycFl4aS8yWWNuZE1FWXdKNCs5dzdXZjRMWFE5cUpj?= =?utf-8?B?eHJ3cDYzQ0hiaDI4RitkdzNoMkdFcnZ1Rytwc2p6RHRZTjArR0lMcFN1eHlT?= =?utf-8?B?MU14dnV1Zk5QMDkrdTc5NXVxMzZINE02aEVYZ3N3VlhjOHNycGpVOXd1T2dV?= =?utf-8?B?QW44SHozc1U4U1RPeHJnaktRNDVYZGl4Z3hnN0F4MGM4RTl0ZnVDOVR2WXFJ?= =?utf-8?B?bjR5QjNsT2xwKzFOaUplTmZjeUVVcGwvTEZIbDF4RGZZUTIwdHZtNDF6Z3o0?= =?utf-8?B?SHd6Q05nN0IvQXczK3F5UW5yU2RROHhGSmRRKzROelBWUWtiN3lGOFp4cXpJ?= =?utf-8?B?aDQxbkM1K2k1RUwvZi83K05EbG0wcGphZnVJcXpuQ3hQb1JOZXJ6eHVMeUVx?= =?utf-8?B?dlV2OU53MTArempvTnNzU2d1MVhPakJCSzNLM0c4ZUxyS3NPNVl0c2dFcVFD?= =?utf-8?B?QitFeG5pb1dGOE9DS254dWJnMEFnSzRQSG9yaitrNnlueTd2aklkdlZYQndz?= =?utf-8?B?dXVhTjlJanhtWTNFMk1HTHkxc2dvdzA3Q3RuenVUZXBRaEtNMGlKSDE3SnMz?= =?utf-8?B?UndRek1kTVdQS096WmJIdkVPcms4eS8vYTF2aFNXbzRjVW5CcVJGWExPS3dM?= =?utf-8?B?QlNDUzdLSVdyeG1uWGVGQWpDT1VyU1pUVW9KSGVmT0dERUNKRGt1N2h6TmI2?= =?utf-8?B?YllOL2hhQXVyNG52TDFTQ0pOejBpaFhycGJtOVU2ZU0vYk1mc3ZYeDA4TW12?= =?utf-8?B?TE5LMmNaWHpQd0pNdnEwYmRCckQ1U09aNDVxNFpJR1JIZlFjVWlkR0U4RlMw?= =?utf-8?B?VWhFQWN5M1ZtcFREcWdXckF2VjJzMUh5ZnRFL2prdHg0YTVkdkFKT1gvTlo0?= =?utf-8?B?UlhuaFVVcHNJdndETmV1U3NYS3RRT09hbWtYVjVBSHMxWkRTQlkxeEtYek5q?= =?utf-8?B?MmVvMHIyL05weHNnNkU1SzQzR0h3OVYxTTNqYVJlNC9BTm1Hb1IybWFCeWJY?= =?utf-8?B?Skpkb000Tyt2ejFxMFhYV1dmUVZpMWFzeHI1S1NuVlg3cUtoYVJHWFhWQjY4?= =?utf-8?B?UndRZmx3cEJOdVJWMU5tRGxVZlhnaXROeEIwWjFURzVlbmxzVVllamppN0lR?= =?utf-8?B?OWhabElXREhETkpyNjNtbTRZK3QwTU92STRaSHQ1aFBDZzh0RkVUN3RVcGZm?= =?utf-8?B?bXdKdGFGeW5UZEttdVplbnhucHpFajZFNXFQem9VMGQxdXU5OGtoeVBOWm9X?= =?utf-8?Q?UN27Cl?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(82310400026)(376014)(1800799024)(36860700013)(7053199007);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Jul 2025 21:33:31.2896 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ee58331c-6751-4aaf-27de-08ddc31e1450 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS2PEPF00003448.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4449 On 2025-07-02 04:12, Juergen Gross wrote: > Move the Xenstore and backend interface related handling into a > sub-function in order to prepare supporting reconnecting to an active > 9pfs device after kexec. > > Signed-off-by: Juergen Gross This includes the replacement of gnttab_alloc_and_grant() which should at least be mentioned in the commit message. 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pr=C Message-ID: Date: Mon, 14 Jul 2025 17:22:59 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Jason Andryuk Subject: Re: [MINI-OS PATCH 16/19] gnttab: remove gnttab_alloc_and_grant() function To: Juergen Gross , , CC: References: <20250702081254.14383-1-jgross@suse.com> <20250702081254.14383-17-jgross@suse.com> Content-Language: en-US In-Reply-To: <20250702081254.14383-17-jgross@suse.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS2PEPF00003448:EE_|LV8PR12MB9269:EE_ X-MS-Office365-Filtering-Correlation-Id: 7aedd5af-62e4-4124-aa3f-08ddc31e1936 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|36860700013|82310400026|7053199007; X-Microsoft-Antispam-Message-Info: =?utf-8?B?L3Q4KzZaaDVNZldiRUR0VnBXZm1HSVV3L3VIdncxd1VlZm5vdnMwS1AzOVdC?= =?utf-8?B?NkEwM2NZaUZsR1hhME43YlBDY1RkcXQ4NEN2QTVLUWNGTGVOVXRiRVM2SWIr?= =?utf-8?B?dlplSmRDWnpCNm9nSkYvQm15RDREeTZybFRqekdTMXh5NDEvL0FFZ0FWVUFV?= =?utf-8?B?T0NzSzJNWUQ0bm9la3I2UERZL0FWVzQvcDBGbXZhek9nR05jcXNVTmtzbDZp?= =?utf-8?B?RXltcmIxRHF3QjdscnFVZndMc2pSSDlSb3ZuNEhsOE1YNU42QndvS1RZbXYv?= =?utf-8?B?dmtjQ0p5U3RaNm9FNTNtUnZad0gyMVA2SjVsZHZRejNPa3gxYjdrTzFyTmVK?= =?utf-8?B?KzRZcmtKeUpIQzVKRjMrcldTN3Q0emNyZ1c2Nmprb1BzU2JqR0JReDM5RDlS?= =?utf-8?B?aVlxbHhzQ240bVEyeHFRdFUyR3VKQmFnWXVXOVlFTDZ6aHRjV0JjRDZNNzIz?= =?utf-8?B?Q0xkQ1VTWjhwa1BCUCtsQUJlWGJKYzhCWnFMNkdKdWo5T2Jmelc0Mmx5OVVZ?= =?utf-8?B?Kzlpcm93VnZwK0VFbS9KZTJoRmNjSTJDUk1DZDFVREZlSG9RdVUxZVZQUENl?= =?utf-8?B?OFF6T3VvU01iUTI3SnNORzBjN0V1YlpYdnRvcTlxb01XUXRHRW56cmo2dFA4?= =?utf-8?B?VElaVGpDQncwMUtIcWxGTGtTZlpFR0J4Mk5lRFc2cWxEK25hYXJNM2lNaEh1?= =?utf-8?B?cENBclFKM0xJc3BBTjRmSzYxYTNsQWQ4eVQ3T1ZBK0ZST3ZZd1E0RnFOYjBX?= =?utf-8?B?dWJ4QkZVUk4zS3NEaWpMVmtUSGV5MHJtNnVKNmtUdSt0RGNST3NzQlJ0OW0y?= =?utf-8?B?T094bUgvaE4zUloxNEV0aEhVVkRSc2hNaDZNWjFhcFlicWJSVTlMU1lWNEN2?= =?utf-8?B?TDE3MldWazRaQU5UMUhRUnluQkV5Wm1oeVBpbGxiNmFDaVEwUHFtdDFrZ0FM?= =?utf-8?B?VFlCSlJFOHk5blpJYWFsN09Od056Y2pXQzVhT2Z5UHFVT0t4bzJUcnJ3MHY1?= =?utf-8?B?dTBTUndCZE9CZlFFOU1WQWtDOWJNbHJnOURKZWhaREF5SysrekJVZURvZitU?= =?utf-8?B?OFdUVEJEeWU0Z1J4cnBYYU9LM2VUZk5qVHNnVmpHL21RM2xXNG9Hd0YrODNz?= =?utf-8?B?d0NsQmYzOS9RYW9oeCtUSE5CZkFSZ3ZsWnZZUTk2ZDdHeGEzWUVRZjVwc254?= =?utf-8?B?NkJyZTF4Rkk2bVhBZ0ZRSEdkQjlvZEpNek1naVRlWHViQlZFY0FtVys3MlVk?= =?utf-8?B?c1hHcTRSdXFNWDBsY041OVFaNmQ1OG5lODR6bnJ4c3NPeENSVEUyWmFDZlZX?= =?utf-8?B?MTM1dkxlRitUamQ4NkhsZWl2eW92M0d4M1h0TS91WGZwWUFFUnFESWRuMlBI?= =?utf-8?B?RW51NC9FcGRtYjBMb01Yc0k2RitEcER4cVdTcUMva0xtM25DU0JNbW4yU1RK?= =?utf-8?B?SklNYk1Cbk9OcjlUdUlnalFtTDdZaUw1dnJuM3VoOTE4WnhhaW9vbmlYWkgw?= =?utf-8?B?M1BqRjVLZk10QldFQW4zM1RjeGN0QTJjSHUyWlZnaE5La29YU1VWaTRRNS9n?= =?utf-8?B?VHFlbmFiWVBEdjI4bDZESkNBaDlHNC8xQ3lPYjBab1hUY2YyUGpBc2ZnUnNi?= =?utf-8?B?SVZHNlNFdjFHaUVCYWZJa3RwWWMvM3JCam9Oc1pGZk43bUdqbFFwTTRmZDdI?= =?utf-8?B?cXcrbVdFd2RFQ3h2dVVjWGNCNUdiQ0c3QTBXelN1RnkxTEtDT0hHRTZ0VWlO?= =?utf-8?B?d3ZlcUZnZnVKOWhEZUtjUGRubXFseUpKbWJybjgrUUxpSTVDMndaUUIvVngz?= =?utf-8?B?c3lvVW9iU0FRVnE2cTdxeVVHSEZZNHExREhqRllSUDM4NFVRU3pkczdrZE9Y?= =?utf-8?B?VHpEUVhUdG1ibTZvaUgxU0ZuY01JT1dkY1NBOEtTT3I3V3YwRlo2TmtrbmlW?= =?utf-8?B?Z3VZbmpZTSt2MnBIMUl0UFAvN0ZiRmFpM2hhd05PRFQ0TS9sYjBNV0kvM2do?= =?utf-8?B?c1h1dnpSUUdKREtrRG5hRWRYUloyZGpXZ3F3RU9QbVdzVmF0Z3lXZXl1QldM?= =?utf-8?Q?mWdv3H?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(1800799024)(376014)(36860700013)(82310400026)(7053199007);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Jul 2025 21:33:39.5168 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7aedd5af-62e4-4124-aa3f-08ddc31e1936 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS2PEPF00003448.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV8PR12MB9269 On 2025-07-02 04:12, Juergen Gross wrote: > The last user of gnttab_alloc_and_grant() is gone. > > Remove gnttab_alloc_and_grant() as it is doing more harm than good. > It is hard coded to only grant access for dom0, which is not really > clear from looking at the function name. It would be possible to add > a domid parameter, but given its now 0 users, there doesn't seem to be > a real demand for that function. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Mon Jul 14 21:41:08 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 14 Jul 2025 21:41:08 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1043112.1413236 (Exim 4.92) (envelope-from ) id 1ubQv6-0001EB-Df; Mon, 14 Jul 2025 21:41:08 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1043112.1413236; Mon, 14 Jul 2025 21:41:08 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubQv6-0001E4-Ay; Mon, 14 Jul 2025 21:41:08 +0000 Received: by outflank-mailman (input) for mailman id 1043112; Mon, 14 Jul 2025 21:41:06 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubQoA-0005Nd-Ut for minios-devel@lists.xenproject.org; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Jul 2025 21:33:52.5293 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f2381622-dd6d-4743-130a-08ddc31e20f9 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS2PEPF00003445.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4351 On 2025-07-02 04:12, Juergen Gross wrote: > Add a new function gnttab_get_addr() to obtain a memory pointer for a > given grant reference. > > Signed-off-by: Juergen Gross Maybe you want to name it gnttab_get_vaddr() to be a little more explicit in its return value? Either way: Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Mon Jul 14 21:41:08 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 14 Jul 2025 21:41:08 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1043113.1413241 (Exim 4.92) (envelope-from ) id 1ubQv6-0001Ej-Hr; Mon, 14 Jul 2025 21:41:08 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1043113.1413241; Mon, 14 Jul 2025 21:41:08 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubQv6-0001EH-Cf; Mon, 14 Jul 2025 21:41:08 +0000 Received: by outflank-mailman (input) for mailman id 1043113; Mon, 14 Jul 2025 21:41:06 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubQv4-0000uf-Se for minios-devel@lists.xenproject.org; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Jul 2025 21:40:57.9200 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9afb4cb2-69c3-4f88-b741-08ddc31f1e83 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CH3PEPF00000014.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8954 On 2025-07-02 04:12, Juergen Gross wrote: > In order to support Xenstore-stubdom live update, the 9pfs device used > to save and restore the Xenstore state needs to be kept open across > kexec, as otherwise re-opening of the device using the new kernel > would not work (this would require Xenstore to be active, which is > obviously not possible before having read the saved state). > > Add an alternative init function for a 9pfs device supporting to take > the configuration from the kexec module instead of Xenstore. Add > support for creating the device using the kexec module, too. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Mon Jul 14 21:42:39 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 14 Jul 2025 21:42:39 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1043139.1413244 (Exim 4.92) (envelope-from ) id 1ubQwY-0001vF-Ln; Mon, 14 Jul 2025 21:42:38 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1043139.1413244; Mon, 14 Jul 2025 21:42:38 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubQwY-0001v8-JI; Mon, 14 Jul 2025 21:42:38 +0000 Received: by outflank-mailman (input) for mailman id 1043139; Mon, 14 Jul 2025 21:42:37 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubQwX-0001uc-2V for minios-devel@lists.xenproject.org; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Jul 2025 21:42:31.4416 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 32b51d6e-bd96-4999-1b3c-08ddc31f563f X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF00029929.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW3PR12MB4345 On 2025-07-02 04:12, Juergen Gross wrote: > Add the needed functions for allocating and freeing memory pages of > the kexec module. > > As the pages are always related to a kexec module record, add the > related utility functions, too. For now only support adding records > and retrieving them. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Mon Jul 14 22:07:29 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 14 Jul 2025 22:07:29 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1043154.1413265 (Exim 4.92) (envelope-from ) id 1ubRKZ-0005oV-RT; Mon, 14 Jul 2025 22:07:27 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1043154.1413265; Mon, 14 Jul 2025 22:07:27 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubRKZ-0005nh-MY; Mon, 14 Jul 2025 22:07:27 +0000 Received: by outflank-mailman (input) for mailman id 1043154; Mon, 14 Jul 2025 22:07:26 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] 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<4764f627-8e3e-4daa-a146-4b103fb33a0e@suse.com> Date: Tue, 15 Jul 2025 15:11:27 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 17/19] gnttab: add function to obtain memory address from grantref To: Jason Andryuk , minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org References: <20250702081254.14383-1-jgross@suse.com> <20250702081254.14383-18-jgross@suse.com> <130ed882-13da-4413-a5af-829d5d30d091@amd.com> Content-Language: en-US From: Juergen Gross Autocrypt: addr=jgross@suse.com; keydata= xsBNBFOMcBYBCACgGjqjoGvbEouQZw/ToiBg9W98AlM2QHV+iNHsEs7kxWhKMjrioyspZKOB ycWxw3ie3j9uvg9EOB3aN4xiTv4qbnGiTr3oJhkB1gsb6ToJQZ8uxGq2kaV2KL9650I1SJve dYm8Of8Zd621lSmoKOwlNClALZNew72NjJLEzTalU1OdT7/i1TXkH09XSSI8mEQ/ouNcMvIJ NwQpd369y9bfIhWUiVXEK7MlRgUG6MvIj6Y3Am/BBLUVbDa4+gmzDC9ezlZkTZG2t14zWPvx XP3FAp2pkW0xqG7/377qptDmrk42GlSKN4z76ELnLxussxc7I2hx18NUcbP8+uty4bMxABEB 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DKIM_SIGNED(0.00)[suse.com:s=susede1]; RCPT_COUNT_THREE(0.00)[4]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.com:email,suse.com:mid]; HAS_ATTACHMENT(0.00)[] X-Spam-Flag: NO X-Spam-Score: -5.20 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------JidC6WdCe5f7v1J51Ofj1sws Content-Type: multipart/mixed; boundary="------------knQc0MJfMW0vWV23Ms0ylAuX"; protected-headers="v1" From: Juergen Gross To: Jason Andryuk , minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org Message-ID: <4764f627-8e3e-4daa-a146-4b103fb33a0e@suse.com> Subject: Re: [MINI-OS PATCH 17/19] gnttab: add function to obtain memory address from grantref References: <20250702081254.14383-1-jgross@suse.com> <20250702081254.14383-18-jgross@suse.com> <130ed882-13da-4413-a5af-829d5d30d091@amd.com> In-Reply-To: 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from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id xMx0GcZXdmgBNwAAD6G6ig (envelope-from ); Tue, 15 Jul 2025 13:29:42 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: c458f6ed-617f-11f0-b894-0df219b8e170 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586182; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=gn+jXUBeZECVlWYUrwJRrUi+VHDxst5pXixlmjQuGVU=; b=Ex4pOT9ZYPry8lpr3QegzkfJsyLlJ4LMOBIZSua5faU0qsf7IQPcL7JNIAS+g5+7sLRl6c 4HMnKTM6BNDjRE7QXCIjYadITqmCRpaGjhDDDobgp3qB4IOFa2Rg9nNPYmeyiyaCy/W5kE mNDCn1O6fRdGBln33R7DTLo6Vt7ZRg4= Authentication-Results: smtp-out2.suse.de; dkim=pass header.d=suse.com header.s=susede1 header.b=Ex4pOT9Z DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586182; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=gn+jXUBeZECVlWYUrwJRrUi+VHDxst5pXixlmjQuGVU=; b=Ex4pOT9ZYPry8lpr3QegzkfJsyLlJ4LMOBIZSua5faU0qsf7IQPcL7JNIAS+g5+7sLRl6c 4HMnKTM6BNDjRE7QXCIjYadITqmCRpaGjhDDDobgp3qB4IOFa2Rg9nNPYmeyiyaCy/W5kE mNDCn1O6fRdGBln33R7DTLo6Vt7ZRg4= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH v2 00/14] Make Xenstore-stubdom live update possible Date: Tue, 15 Jul 2025 15:29:22 +0200 Message-ID: <20250715132936.2798-1-jgross@suse.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[100.00%]; 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X-Rspamd-Queue-Id: 970811F397 X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Action: no action X-Spam-Score: -3.01 With this series applied I was able to perform Live Update of Xenstore running in a PVH stubdom. The main problem to solve was to keep the 9pfs device used to store and later retrieve the Xenstore state usable across kexec(). This has been achieved by using a module containing the shared pages of the device and the related config data. This module is then passed to the new kernel via linking it to the struct hvm_start_info. The rest of the series are some missing bits and pieces to have a sane state when activating the new kernel, and some minor fixes and cleanups. In order to be able to perform a Xenstore live update an associated patch series for Xen is needed. The Xen series is depending on this Mini-OS patch series. Changes in V2: - patches 1-5 of V1 have been applied already - addressed the (minor) comments to V1 Juergen Gross (14): mm: don't add module pages to free memory kexec: fix physical addresses in start info data e820: don't count lapic page as initially reserved kexec: restructure building the start info data e820: use special type for software reserved memory mini-os: config: add support for config items with numerical values mini-os: kexec: add support for handing over some memory across kexec kexec: add support for allocating pages from kexec module memory 9pfs: store bepath in struct struct dev_9pfs 9pfs: refactor init_9pfront() gnttab: remove gnttab_alloc_and_grant() function gnttab: add function to obtain memory address from grantref 9pfs: add support to keep device opened across kexec events: export bind_evtchn() 9pfront.c | 267 +++++++++++++++++++++++++++++++----------- Config.mk | 6 + arch/x86/kexec.c | 123 +++++++++++++++++-- arch/x86/mm.c | 95 +++++++++++++++ arch/x86/setup.c | 28 +++++ e820.c | 11 +- events.c | 1 + gnttab.c | 15 +-- include/9pfront.h | 9 ++ include/e820.h | 2 + include/gnttab.h | 2 +- include/kernel.h | 1 + include/kexec.h | 122 +++++++++++++++++++ include/mm.h | 1 + include/x86/arch_mm.h | 1 + kexec.c | 118 +++++++++++++++++++ mm.c | 27 ++++- 17 files changed, 733 insertions(+), 96 deletions(-) -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 15 13:29:50 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 15 Jul 2025 13:29:50 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1044113.1414221 (Exim 4.92) (envelope-from ) id 1ubfjC-00015c-Nu; 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Tue, 15 Jul 2025 13:29:48 +0000 (UTC) Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 0673113A68; Tue, 15 Jul 2025 13:29:48 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id MCIYAMxXdmgJNwAAD6G6ig (envelope-from ); Tue, 15 Jul 2025 13:29:48 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: c7814a5f-617f-11f0-a319-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586188; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=NTu0grqsD74PNEs9r+9EO+DwJ5Ex1gjWiVPjU6SdJuY=; b=Kpm3VYPWOiYkSIDCJjnnLl0TXzWygPeSylUcOeQomU9E9SHa/mLH6jns/yA0tJs1XGybGH SL039sf3W0Q6hW2KJQL2Siv0NRHvsHpmoy5mKaC55udeWi04Z0mu+HjxjI99t24xbMULdI 5BirFR1rEF0xmVrTJivjkJTTnQ2nFKM= Authentication-Results: smtp-out2.suse.de; dkim=pass header.d=suse.com header.s=susede1 header.b=Kpm3VYPW DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586188; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=NTu0grqsD74PNEs9r+9EO+DwJ5Ex1gjWiVPjU6SdJuY=; b=Kpm3VYPWOiYkSIDCJjnnLl0TXzWygPeSylUcOeQomU9E9SHa/mLH6jns/yA0tJs1XGybGH SL039sf3W0Q6hW2KJQL2Siv0NRHvsHpmoy5mKaC55udeWi04Z0mu+HjxjI99t24xbMULdI 5BirFR1rEF0xmVrTJivjkJTTnQ2nFKM= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH v2 01/14] mm: don't add module pages to free memory Date: Tue, 15 Jul 2025 15:29:23 +0200 Message-ID: <20250715132936.2798-2-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250715132936.2798-1-jgross@suse.com> References: <20250715132936.2798-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Level: X-Spam-Flag: NO X-Rspamd-Queue-Id: 2FB2E1F44F X-Rspamd-Action: no action X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Spamd-Result: default: False [-3.01 / 50.00]; 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This is relevant only when running in PVH mode, as in PV mode only memory above the initial page tables is added to free memory, and the module and start_info pages are below the page tables. Signed-off-by: Juergen Gross --- V2: - call pvh_reserve_start_info() from arch_mm_preinit() (Jason Andryuk) --- arch/x86/mm.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++ include/mm.h | 1 + mm.c | 21 +++++++++++++- 3 files changed, 98 insertions(+), 1 deletion(-) diff --git a/arch/x86/mm.c b/arch/x86/mm.c index 26ede6f4..f60e7d58 100644 --- a/arch/x86/mm.c +++ b/arch/x86/mm.c @@ -78,6 +78,10 @@ void arch_mm_preinit(void *p) last_free_pfn = si->nr_pages; balloon_set_nr_pages(last_free_pfn, last_free_pfn); } + +void check_memory_range(unsigned long *from, unsigned long *to) +{ +} #else #include user_desc gdt[NR_GDT_ENTRIES] = @@ -108,6 +112,42 @@ desc_ptr idt_ptr = .base = (unsigned long)&idt, }; +#define max(a, b) ((a) < (b) ? (b) : (a)) + +static void pvh_reserve_start_info(unsigned long *start_pfn) +{ + unsigned long end = 0; + unsigned long start = (unsigned long)hvm_start_info_ptr; + unsigned long end_pfn; + unsigned int m; + struct hvm_modlist_entry *mod; + char *cmdline; + + mod = (void *)(unsigned long)hvm_start_info_ptr->modlist_paddr; + + end = max(end, start + sizeof(struct hvm_start_info)); + end = max(end, hvm_start_info_ptr->modlist_paddr + + hvm_start_info_ptr->nr_modules * + sizeof(struct hvm_modlist_entry)); + for ( m = 0; m < hvm_start_info_ptr->nr_modules; m++ ) + { + cmdline = (char *)(unsigned long)mod[m].cmdline_paddr; + if ( cmdline ) + end = max(end, (unsigned long)cmdline + strlen(cmdline) + 1); + } + cmdline = (char *)(unsigned long)hvm_start_info_ptr->cmdline_paddr; + if ( cmdline ) + end = max(end, (unsigned long)cmdline + strlen(cmdline) + 1); + if ( hvm_start_info_ptr->version >= 1 ) + end = max(end, hvm_start_info_ptr->memmap_paddr + + hvm_start_info_ptr->memmap_entries * + sizeof(struct hvm_memmap_table_entry)); + + end_pfn = PFN_UP(end); + if ( end_pfn > *start_pfn ) + *start_pfn = end_pfn; +} + void arch_mm_preinit(void *p) { unsigned int pages; @@ -124,6 +164,43 @@ void arch_mm_preinit(void *p) pages = e820_get_current_pages(); last_free_pfn = e820_get_maxpfn(pages); balloon_set_nr_pages(pages, last_free_pfn); + pvh_reserve_start_info(&first_free_pfn); +} + +static void check_memory_range_conflict(unsigned long *from, unsigned long *to, + unsigned long chk, unsigned long sz) +{ + unsigned long chk_end = chk + sz; + + if ( *to <= chk || *from >= chk_end ) + return; + + if ( chk <= *from ) + *from = (chk_end >= *to) ? *to : chk_end; + else + *to = chk; +} + +/* Reserved memory ranges not added to free memory. */ +#define MAX_RSV_RANGES 1 +static struct { + unsigned long start; + unsigned long size; +} reserved_range[MAX_RSV_RANGES]; + +void check_memory_range(unsigned long *from, unsigned long *to) +{ + unsigned int m; + struct hvm_modlist_entry *mod; + + for ( m = 0; m < MAX_RSV_RANGES && reserved_range[m].size; m++ ) + check_memory_range_conflict(from, to, reserved_range[m].start, + reserved_range[m].size); + + mod = (struct hvm_modlist_entry *)(unsigned long) + hvm_start_info_ptr->modlist_paddr; + for ( m = 0; m < hvm_start_info_ptr->nr_modules; m++ ) + check_memory_range_conflict(from, to, mod[m].paddr, mod[m].size); } #endif diff --git a/include/mm.h b/include/mm.h index 1dc89ddb..995e9862 100644 --- a/include/mm.h +++ b/include/mm.h @@ -74,6 +74,7 @@ static __inline__ int get_order(unsigned long size) void arch_init_demand_mapping_area(void); void arch_init_mm(unsigned long* start_pfn_p, unsigned long* max_pfn_p); +void check_memory_range(unsigned long *from, unsigned long *to); unsigned long allocate_ondemand(unsigned long n, unsigned long alignment); /* map f[i*stride]+i*increment for i in 0..n-1, aligned on alignment pages */ diff --git a/mm.c b/mm.c index 858dc108..8c41d2f2 100644 --- a/mm.c +++ b/mm.c @@ -185,6 +185,25 @@ static void add_memory_range(unsigned long r_min, unsigned long r_max) } } +static void consider_memory_range(unsigned long r_min, unsigned long r_max, + void (*func)(unsigned long, unsigned long)) +{ + unsigned long from = r_min; + unsigned long to = r_max; + + while ( true ) + { + check_memory_range(&from, &to); + if ( from == to ) + return; + + func(from, to); + + from = to; + to = r_max; + } +} + void iterate_memory_range(unsigned long min, unsigned long max, void (*func)(unsigned long, unsigned long)) { @@ -207,7 +226,7 @@ void iterate_memory_range(unsigned long min, unsigned long max, if ( r_max > max ) r_max = max; - func(r_min, r_max); + consider_memory_range(r_min, r_max, func); } } -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 15 13:29:56 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 15 Jul 2025 13:29:56 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1044116.1414235 (Exim 4.92) (envelope-from ) id 1ubfjI-0001P6-6N; Tue, 15 Jul 2025 13:29:56 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1044116.1414235; Tue, 15 Jul 2025 13:29:56 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubfjI-0001Oz-3F; 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none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586193; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=lDLoaippG53vLOL0sHnqy7SiZBuEGT4wELxw+HEbbmQ=; b=GOF8XqOvO8HKoiA+Kyj4jDiygj8+3WXWB/54GkpnMysYqD0JjxROPKpnWoShEGaddF7mCF uxSbnbxiP6Ulde4qejlA8lkDaK2hP4iXqHePy5XzRgou1uzyRWeOrvyCyliuZlxOIh5iOQ dEYCLnHS8j5fd6a+NHpyGKIE6aroAgI= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross , Jason Andryuk Subject: [MINI-OS PATCH v2 02/14] kexec: fix physical addresses in start info data Date: Tue, 15 Jul 2025 15:29:24 +0200 Message-ID: <20250715132936.2798-3-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250715132936.2798-1-jgross@suse.com> References: <20250715132936.2798-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Level: X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.com:email,suse.com:mid,amd.com:email]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FUZZY_RATELIMITED(0.00)[rspamd.com]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; RCPT_COUNT_FIVE(0.00)[5]; RCVD_TLS_ALL(0.00)[] X-Spam-Flag: NO X-Spam-Score: -2.80 The physical addresses in struct hvm_start_info are pointing to the memory where the data is being built instead of the location where it will finally be moved to. Fix that. Additionally rename kexec_param_loc to kexec_param_pa to better reflect the semantics of the variable. Fixes: b7994b6409a4 ("mini-os: kexec: build parameters for new kernel") Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- V2: - rename kexec_param_loc to kexec_param_pa (Jason Andryuk) --- arch/x86/kexec.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/arch/x86/kexec.c b/arch/x86/kexec.c index fc58473e..d0af460d 100644 --- a/arch/x86/kexec.c +++ b/arch/x86/kexec.c @@ -197,7 +197,7 @@ bool kexec_arch_need_analyze_shdrs(void) return kernel_phys_entry == ~0UL; } -static unsigned long kexec_param_loc; +static unsigned long kexec_param_pa; static unsigned int kexec_param_size; static unsigned long kexec_param_mem; @@ -208,7 +208,7 @@ void kexec_set_param_loc(const char *cmdline) kexec_param_size += strlen(cmdline) + 1; kexec_last_addr = (kexec_last_addr + 7) & ~7UL; - kexec_param_loc = kexec_last_addr; + kexec_param_pa = kexec_last_addr; kexec_last_addr += kexec_param_size; kexec_last_addr = round_pgup(kexec_last_addr); } @@ -233,9 +233,9 @@ int kexec_get_entry(const char *cmdline) memset(info, 0, sizeof(*info)); info->magic = XEN_HVM_START_MAGIC_VALUE; info->version = 1; - info->cmdline_paddr = kexec_param_mem + sizeof(*info) + + info->cmdline_paddr = kexec_param_pa + sizeof(*info) + e820_entries * sizeof(struct hvm_memmap_table_entry); - info->memmap_paddr = kexec_param_mem + sizeof(*info); + info->memmap_paddr = kexec_param_pa + sizeof(*info); info->memmap_entries = e820_entries; mmap = (struct hvm_memmap_table_entry *)(info + 1); @@ -249,13 +249,13 @@ int kexec_get_entry(const char *cmdline) strcpy((char *)mmap, cmdline); - if ( kexec_add_action(KEXEC_COPY, to_virt(kexec_param_loc), info, + if ( kexec_add_action(KEXEC_COPY, to_virt(kexec_param_pa), info, kexec_param_size) ) return ENOSPC; /* The call of the new kernel happens via the physical address! */ if ( kexec_add_action(KEXEC_CALL, (void *)kernel_phys_entry, - (void *)kexec_param_loc, 0) ) + (void *)kexec_param_pa, 0) ) return ENOSPC; return 0; -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 15 13:30:01 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 15 Jul 2025 13:30:01 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1044120.1414253 (Exim 4.92) (envelope-from ) id 1ubfjN-0001pb-Re; 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Tue, 15 Jul 2025 13:29:59 +0000 (UTC) Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 2440F13A68; Tue, 15 Jul 2025 13:29:59 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 12lqB9dXdmgeNwAAD6G6ig (envelope-from ); Tue, 15 Jul 2025 13:29:59 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: ce12eac5-617f-11f0-b894-0df219b8e170 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586199; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=x9TLANKlez8tsN2wKkkD1NspuAsBv9mWQ6EyKJDqy7M=; b=P0Sr58IXZDYS9lagLZeK0j4k2WZ6T7TS2CPWKg3jSegJIvVCC8/7dUfYFQLxZHjfRNG+iA n6e46D69/yao2bnupS46sHIYTGfX5iVtPrYjeDeczlHvE/bMTyz6ULSEQNU/qgH4WGjkun bx5UURBrtwE5Pa5B8ujRWLUp1yHaayU= Authentication-Results: smtp-out2.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586199; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=x9TLANKlez8tsN2wKkkD1NspuAsBv9mWQ6EyKJDqy7M=; b=P0Sr58IXZDYS9lagLZeK0j4k2WZ6T7TS2CPWKg3jSegJIvVCC8/7dUfYFQLxZHjfRNG+iA n6e46D69/yao2bnupS46sHIYTGfX5iVtPrYjeDeczlHvE/bMTyz6ULSEQNU/qgH4WGjkun bx5UURBrtwE5Pa5B8ujRWLUp1yHaayU= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross , Jason Andryuk Subject: [MINI-OS PATCH v2 03/14] e820: don't count lapic page as initially reserved Date: Tue, 15 Jul 2025 15:29:25 +0200 Message-ID: <20250715132936.2798-4-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250715132936.2798-1-jgross@suse.com> References: <20250715132936.2798-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Level: X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[amd.com:email,imap1.dmz-prg2.suse.org:helo,suse.com:email,suse.com:mid]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FUZZY_RATELIMITED(0.00)[rspamd.com]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; RCPT_COUNT_FIVE(0.00)[5]; RCVD_TLS_ALL(0.00)[] X-Spam-Flag: NO X-Spam-Score: -2.80 The number of pages marked initially as reserved in the memory map are counted to be allocated, as they are normally populated by Xen tools for e.g. xenbus and console ring pages. This is wrong in case the lapic page is marked as reserved in the memory map, as there is never memory allocated for a lapic. So when finding the lapic page to be marked as reserved, don't add it to the number of reserved pages. Fixes: 9b87429d2864 ("mini-os: fix number of pages for PVH") Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- e820.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/e820.c b/e820.c index 16622e23..44cfac05 100644 --- a/e820.c +++ b/e820.c @@ -275,7 +275,10 @@ static void e820_sanitize(void) e820_initial_reserved_pfns += e820_map[i].size / PAGE_SIZE; if ( e820_map[i].addr <= LAPIC_ADDRESS && e820_map[i].addr + e820_map[i].size > LAPIC_ADDRESS ) + { found_lapic = true; + e820_initial_reserved_pfns--; + } } } -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 15 13:30:06 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 15 Jul 2025 13:30:06 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1044128.1414263 (Exim 4.92) (envelope-from ) id 1ubfjS-0002sK-QT; Tue, 15 Jul 2025 13:30:06 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1044128.1414263; Tue, 15 Jul 2025 13:30:06 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubfjS-0002rg-MX; Tue, 15 Jul 2025 13:30:06 +0000 Received: by outflank-mailman (input) for mailman id 1044128; Tue, 15 Jul 2025 13:30:05 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubfjR-00013q-Sd for minios-devel@lists.xenproject.org; Tue, 15 Jul 2025 13:30:05 +0000 Received: from smtp-out2.suse.de (smtp-out2.suse.de [2a07:de40:b251:101:10:150:64:2]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id d1856780-617f-11f0-a319-13f23c93f187; Tue, 15 Jul 2025 15:30:05 +0200 (CEST) Received: from imap1.dmz-prg2.suse.org (unknown [10.150.64.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id EE8DC1F769; 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bh=ycMxB7C6V9MFY6iKdrBuAK81Hin6bWQs2JTEO7PYpys=; b=qqG6dvE7L1PDj++98MXqGAx0S7cMJxl9K6qe5gXUiQJaZG2N+vIuoXh1FO9KrxRHDvRtr4 XOgfOcSftBy1DhQ0Ku3dQb3Uy05lgjXoRwfG57ieVoTVLErKKemZOWdUpRDhBV1X28laSZ +bQFeGCMQKAeaC7GrHKw+aHXXFjRzzw= Authentication-Results: smtp-out2.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586204; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ycMxB7C6V9MFY6iKdrBuAK81Hin6bWQs2JTEO7PYpys=; b=kkmlP9MVsCHJRKFCUH9ZVd4oSIdSs5Gn3UWppI4+dwSycpDZVLX4Ti7Wxe1LoIkx8imK7s /TU46f/wnH3E5uNsdb4ssw5/pARLU7DMvO/pWah8jXnsPVQzK63rqJ1bR23k9R/Ha16Hih v8j1hGkWJH3nmh3ZcMVXZfcWfCkfgTQ= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross , Jason Andryuk Subject: [MINI-OS PATCH v2 04/14] kexec: restructure building the start info data Date: Tue, 15 Jul 2025 15:29:26 +0200 Message-ID: <20250715132936.2798-5-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250715132936.2798-1-jgross@suse.com> References: <20250715132936.2798-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[amd.com:email,imap1.dmz-prg2.suse.org:helo,suse.com:mid,suse.com:email]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FUZZY_RATELIMITED(0.00)[rspamd.com]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; RCPT_COUNT_FIVE(0.00)[5]; RCVD_TLS_ALL(0.00)[] X-Spam-Flag: NO X-Spam-Level: X-Spam-Score: -2.80 Instead of setting most of the struct hvm_start_info fields first and then building the leaf data, restructure kexec_get_entry() by using an opaque "next" pointer where the next leaf data will be stored and handle that leaf data together with the associated hvm_start_info fields. This will make it easier to add new data items without having to rewrite large portions of the function. Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- arch/x86/kexec.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) diff --git a/arch/x86/kexec.c b/arch/x86/kexec.c index d0af460d..29f8aa81 100644 --- a/arch/x86/kexec.c +++ b/arch/x86/kexec.c @@ -215,6 +215,7 @@ void kexec_set_param_loc(const char *cmdline) int kexec_get_entry(const char *cmdline) { + void *next; struct hvm_start_info *info; struct hvm_memmap_table_entry *mmap; unsigned int order; @@ -229,16 +230,17 @@ int kexec_get_entry(const char *cmdline) if ( !kexec_param_mem ) return ENOMEM; - info = (struct hvm_start_info *)kexec_param_mem; + next = (void *)kexec_param_mem; + + info = next; memset(info, 0, sizeof(*info)); info->magic = XEN_HVM_START_MAGIC_VALUE; info->version = 1; - info->cmdline_paddr = kexec_param_pa + sizeof(*info) + - e820_entries * sizeof(struct hvm_memmap_table_entry); - info->memmap_paddr = kexec_param_pa + sizeof(*info); - info->memmap_entries = e820_entries; + next = info + 1; - mmap = (struct hvm_memmap_table_entry *)(info + 1); + mmap = next; + info->memmap_paddr = kexec_param_pa + (unsigned long)next - kexec_param_mem; + info->memmap_entries = e820_entries; for ( i = 0; i < e820_entries; i++ ) { mmap->addr = e820_map[i].addr; @@ -246,8 +248,10 @@ int kexec_get_entry(const char *cmdline) mmap->type = e820_map[i].type; mmap++; } + next = mmap; - strcpy((char *)mmap, cmdline); + info->cmdline_paddr = kexec_param_pa + (unsigned long)next - kexec_param_mem; + strcpy(next, cmdline); if ( kexec_add_action(KEXEC_COPY, to_virt(kexec_param_pa), info, kexec_param_size) ) -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 15 13:32:41 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 15 Jul 2025 13:32:41 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1044190.1414307 (Exim 4.92) (envelope-from ) id 1ubflx-0006lA-2x; Tue, 15 Jul 2025 13:32:41 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1044190.1414307; 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Tue, 15 Jul 2025 13:30:33 +0000 (UTC) Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id DAE2C13A68; Tue, 15 Jul 2025 13:30:32 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 5crsM/hXdmh1NwAAD6G6ig (envelope-from ); Tue, 15 Jul 2025 13:30:32 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: e247bf97-617f-11f0-b894-0df219b8e170 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586233; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BDdRGnWTd5zwdCL0TVOinfUW7FrCL8NCA12iHuDre8E=; b=nYNcCmldwPuW2gGg9URjLy87kYhJtYKeUWCY8VaL/SJCLJ4ny3UkbrGbI+r9yxTSUIDX3P isr/+bd8i2zZyd8n0mSwr4V5+5tsPY447T52puZEHLEhrYZkBmiQnNBvRkNptxGbcOYtb/ uNaKVmMpHnjYivtcpItwBfu2CmYW9VA= Authentication-Results: smtp-out1.suse.de; dkim=pass header.d=suse.com header.s=susede1 header.b=nYNcCmld DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586233; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BDdRGnWTd5zwdCL0TVOinfUW7FrCL8NCA12iHuDre8E=; b=nYNcCmldwPuW2gGg9URjLy87kYhJtYKeUWCY8VaL/SJCLJ4ny3UkbrGbI+r9yxTSUIDX3P isr/+bd8i2zZyd8n0mSwr4V5+5tsPY447T52puZEHLEhrYZkBmiQnNBvRkNptxGbcOYtb/ uNaKVmMpHnjYivtcpItwBfu2CmYW9VA= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross , Jason Andryuk Subject: [MINI-OS PATCH v2 09/14] 9pfs: store bepath in struct struct dev_9pfs Date: Tue, 15 Jul 2025 15:29:31 +0200 Message-ID: <20250715132936.2798-10-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250715132936.2798-1-jgross@suse.com> References: <20250715132936.2798-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Level: X-Spam-Flag: NO X-Rspamd-Queue-Id: 1663421232 X-Rspamd-Action: no action X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Spamd-Result: default: False [-3.01 / 50.00]; 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Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- 9pfront.c | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-) diff --git a/9pfront.c b/9pfront.c index 895426d1..2bfc49b1 100644 --- a/9pfront.c +++ b/9pfront.c @@ -25,6 +25,7 @@ struct dev_9pfs { char nodename[20]; unsigned int dom; char *backend; + char bepath[64]; char *tag; const char *mnt; @@ -1103,7 +1104,6 @@ void *init_9pfront(unsigned int id, const char *mnt) char *reason = ""; xenbus_transaction_t xbt; int retry = 1; - char bepath[64] = { 0 }; XenbusState state; unsigned int i; void *addr; @@ -1137,11 +1137,12 @@ void *init_9pfront(unsigned int id, const char *mnt) if ( msg ) goto err; - snprintf(bepath, sizeof(bepath), "%s/state", dev->backend); - free(xenbus_watch_path_token(XBT_NIL, bepath, bepath, &dev->events)); - state = xenbus_read_integer(bepath); + snprintf(dev->bepath, sizeof(dev->bepath), "%s/state", dev->backend); + free(xenbus_watch_path_token(XBT_NIL, dev->bepath, dev->bepath, + &dev->events)); + state = xenbus_read_integer(dev->bepath); while ( msg == NULL && state < XenbusStateInitWait ) - msg = xenbus_wait_for_state_change(bepath, &state, &dev->events); + msg = xenbus_wait_for_state_change(dev->bepath, &state, &dev->events); if ( msg || state != XenbusStateInitWait ) { reason = "illegal backend state"; @@ -1228,9 +1229,9 @@ void *init_9pfront(unsigned int id, const char *mnt) free(xenbus_transaction_end(xbt, 0, &retry)); } - state = xenbus_read_integer(bepath); + state = xenbus_read_integer(dev->bepath); while ( msg == NULL && state < XenbusStateConnected ) - msg = xenbus_wait_for_state_change(bepath, &state, &dev->events); + msg = xenbus_wait_for_state_change(dev->bepath, &state, &dev->events); if ( msg || state != XenbusStateConnected ) { reason = "illegal backend state"; @@ -1263,8 +1264,6 @@ void *init_9pfront(unsigned int id, const char *mnt) free(xenbus_transaction_end(xbt, 1, &retry)); err: - if ( bepath[0] ) - free(xenbus_unwatch_path_token(XBT_NIL, bepath, bepath)); if ( msg ) printk("9pfsfront add %u failed, error %s accessing Xenstore\n", id, msg); @@ -1279,22 +1278,20 @@ EXPORT_SYMBOL(init_9pfront); void shutdown_9pfront(void *dev) { struct dev_9pfs *dev9p = dev; - char bepath[64]; XenbusState state; char *msg; char *reason = ""; umount(dev9p->mnt); - snprintf(bepath, sizeof(bepath), "%s/state", dev9p->backend); msg = xenbus_printf(XBT_NIL, dev9p->nodename, "state", "%u", XenbusStateClosing); if ( msg ) goto err; - state = xenbus_read_integer(bepath); + state = xenbus_read_integer(dev9p->bepath); while ( msg == NULL && state < XenbusStateClosing) - msg = xenbus_wait_for_state_change(bepath, &state, &dev9p->events); + msg = xenbus_wait_for_state_change(dev9p->bepath, &state, &dev9p->events); if ( msg || state != XenbusStateClosing ) { reason = "illegal backend state"; -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 15 13:33:00 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 15 Jul 2025 13:33:00 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1044205.1414310 (Exim 4.92) (envelope-from ) id 1ubfmG-000763-5A; 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Tue, 15 Jul 2025 13:30:10 +0000 (UTC) Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 5510A13A68; Tue, 15 Jul 2025 13:30:10 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id q/lCE+JXdmhQNwAAD6G6ig (envelope-from ); Tue, 15 Jul 2025 13:30:10 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: d4c5ddcf-617f-11f0-b894-0df219b8e170 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586210; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=B6SWSOlBDneLonJNetlsBzYkrHEyPfegHVWVGLmwK3g=; b=HLelBBGxCaT0BsshA7lxY0tl3kEJvM1WhjX8uru6TwIkWutWG+CoCgnwqjAdOyGoYitGny Wznbo86UumQa9uiqZIaUsvfbfKeVMiJHCrCqnHHLSb5aCYPghnkxZtLhFcjEaCY2Q/A4t0 4v9ekTZ5o0uUkhJXkH494RNIXgROmGI= Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586210; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=B6SWSOlBDneLonJNetlsBzYkrHEyPfegHVWVGLmwK3g=; b=HLelBBGxCaT0BsshA7lxY0tl3kEJvM1WhjX8uru6TwIkWutWG+CoCgnwqjAdOyGoYitGny Wznbo86UumQa9uiqZIaUsvfbfKeVMiJHCrCqnHHLSb5aCYPghnkxZtLhFcjEaCY2Q/A4t0 4v9ekTZ5o0uUkhJXkH494RNIXgROmGI= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross , Jason Andryuk Subject: [MINI-OS PATCH v2 05/14] e820: use special type for software reserved memory Date: Tue, 15 Jul 2025 15:29:27 +0200 Message-ID: <20250715132936.2798-6-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250715132936.2798-1-jgross@suse.com> References: <20250715132936.2798-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Level: X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_COUNT_TWO(0.00)[2]; TO_DN_SOME(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_ALL(0.00)[]; RCPT_COUNT_FIVE(0.00)[5]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:email,suse.com:mid,amd.com:email,imap1.dmz-prg2.suse.org:helo] X-Spam-Flag: NO X-Spam-Score: -2.80 For memory areas used to map foreign domain memory Mini-OS is using the type E820_RESERVED in the memory map today. This is causing problems with kexec, as the new kernel should not see those areas in the memory map. Unfortunately the sequence of actions for calculating the size of the memory map and the removal of those reserved areas can't easily be adjusted to do the removal first, so another way must be used to avoid passing those reserved areas to the new kernel. Instead of using the type E820_RESERVED, which might be used for other pages as well, just use a new type. Areas with that new type can easily be filtered out when building the memory map for the new kernel. Introduce the type E820_TYPE_SOFT_RESERVED with the same value as the Linux kernel is using for the same purpose. Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- arch/x86/kexec.c | 4 +++- e820.c | 8 ++++---- include/e820.h | 2 ++ 3 files changed, 9 insertions(+), 5 deletions(-) diff --git a/arch/x86/kexec.c b/arch/x86/kexec.c index 29f8aa81..b33fbfc1 100644 --- a/arch/x86/kexec.c +++ b/arch/x86/kexec.c @@ -240,14 +240,16 @@ int kexec_get_entry(const char *cmdline) mmap = next; info->memmap_paddr = kexec_param_pa + (unsigned long)next - kexec_param_mem; - info->memmap_entries = e820_entries; for ( i = 0; i < e820_entries; i++ ) { + if ( e820_map[i].type == E820_TYPE_SOFT_RESERVED ) + continue; mmap->addr = e820_map[i].addr; mmap->size = e820_map[i].size; mmap->type = e820_map[i].type; mmap++; } + info->memmap_entries = mmap - (struct hvm_memmap_table_entry *)next; next = mmap; info->cmdline_paddr = kexec_param_pa + (unsigned long)next - kexec_param_mem; diff --git a/e820.c b/e820.c index 44cfac05..1ffeaf00 100644 --- a/e820.c +++ b/e820.c @@ -367,8 +367,8 @@ unsigned long e820_get_reserved_pfns(int pages) for ( i = 0; i < e820_entries && e820_map[i].addr < last + needed; i++ ) last = round_pgup(e820_map[i].addr + e820_map[i].size); - if ( i == 0 || e820_map[i - 1].type != E820_RESERVED ) - e820_insert_entry_at(i, last, needed, E820_RESERVED); + if ( i == 0 || e820_map[i - 1].type != E820_TYPE_SOFT_RESERVED ) + e820_insert_entry_at(i, last, needed, E820_TYPE_SOFT_RESERVED); else e820_map[i - 1].size += needed; @@ -385,7 +385,7 @@ void e820_put_reserved_pfns(unsigned long start_pfn, int pages) i < e820_entries && addr >= e820_map[i].addr + e820_map[i].size; i++ ); - BUG_ON(i == e820_entries || e820_map[i].type != E820_RESERVED || + BUG_ON(i == e820_entries || e820_map[i].type != E820_TYPE_SOFT_RESERVED || addr + size > e820_map[i].addr + e820_map[i].size); if ( addr == e820_map[i].addr ) @@ -405,7 +405,7 @@ void e820_put_reserved_pfns(unsigned long start_pfn, int pages) e820_insert_entry_at(i + 1, addr + size, e820_map[i].addr + e820_map[i].size - addr - size, - E820_RESERVED); + E820_TYPE_SOFT_RESERVED); e820_map[i].size = addr - e820_map[i].addr; } #endif diff --git a/include/e820.h b/include/e820.h index ffa15aa9..ad5657ff 100644 --- a/include/e820.h +++ b/include/e820.h @@ -39,6 +39,8 @@ #define E820_DISABLED 6 #define E820_PMEM 7 #define E820_TYPES 8 +/* Memory reserved for Mini-OS internal purpose. */ +#define E820_TYPE_SOFT_RESERVED 0xefffffff struct __packed e820entry { uint64_t addr; -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 15 13:33:08 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 15 Jul 2025 13:33:08 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1044210.1414314 (Exim 4.92) (envelope-from ) id 1ubfmO-0007Cy-83; Tue, 15 Jul 2025 13:33:08 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1044210.1414314; Tue, 15 Jul 2025 13:33:08 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubfmO-0007Cr-5M; 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Tue, 15 Jul 2025 13:30:21 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id cEFcJO1XdmhhNwAAD6G6ig (envelope-from ); Tue, 15 Jul 2025 13:30:21 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: db7a5880-617f-11f0-a319-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586221; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=oBjjfWuh5HXNSeK9rtf2P0Bn6GxDYqshVshwDQxxP10=; b=SELp9Fi10Tbk9XMOnXA92SIxmcPRIOfBbv4HcO8pwQ5nSIo1ynRIK1TbNlLc9gvxKSHmok p3AxWHCw/sg6Pkad4Z8ShvyNh/j2WLBtkmti31D32V4J2ytaXUC+bFx219ek0EJNIuS98G 77Sw0lpIrsq+1lVvgg7tN3boFRv/3Ek= Authentication-Results: smtp-out2.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586221; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=oBjjfWuh5HXNSeK9rtf2P0Bn6GxDYqshVshwDQxxP10=; b=SELp9Fi10Tbk9XMOnXA92SIxmcPRIOfBbv4HcO8pwQ5nSIo1ynRIK1TbNlLc9gvxKSHmok p3AxWHCw/sg6Pkad4Z8ShvyNh/j2WLBtkmti31D32V4J2ytaXUC+bFx219ek0EJNIuS98G 77Sw0lpIrsq+1lVvgg7tN3boFRv/3Ek= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH v2 07/14] mini-os: kexec: add support for handing over some memory across kexec Date: Tue, 15 Jul 2025 15:29:29 +0200 Message-ID: <20250715132936.2798-8-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250715132936.2798-1-jgross@suse.com> References: <20250715132936.2798-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Level: X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; MIME_TRACE(0.00)[0:+]; TO_MATCH_ENVRCPT_ALL(0.00)[]; ARC_NA(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; RCVD_TLS_ALL(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DBL_BLOCKED_OPENRESOLVER(0.00)[config.mk:url,imap1.dmz-prg2.suse.org:helo,suse.com:email,suse.com:mid] X-Spam-Flag: NO X-Spam-Score: -2.80 Especially for support of Xenstore-stubdom live update some memory must be handed over to the new kernel without moving it around: as the 9pfs device used for storing and retrieving the state of Xenstore needs to be kept operational across kexec (it can't be reopened due to Xenstore not being available without access to the device), the ring pages need to be accessible via active grants by the backend all the time. Add the basic support for that by reserving a pre-defined number of memory pages at the top of the memory. This memory area will be handed over to the new kernel via specifying it as a module in struct hvm_start_info. The contents of the memory area are described via a generic table of contents in the last page of the memory. Signed-off-by: Juergen Gross --- V2: - set kexec_mod_start in kexec_check_module() - remove fallback definition of CONFIG_KEXEC_MODULE_PAGES (Jan Beulich) - fix mod_ptr->recs_off alignment (Jason Andryuk) - expand comment at start of kexec.h (Jason Andryuk) --- Config.mk | 2 ++ arch/x86/kexec.c | 79 +++++++++++++++++++++++++++++++++++++++++++ arch/x86/mm.c | 18 ++++++++++ arch/x86/setup.c | 28 +++++++++++++++ include/kernel.h | 1 + include/kexec.h | 69 +++++++++++++++++++++++++++++++++++++ include/x86/arch_mm.h | 1 + kexec.c | 3 ++ mm.c | 6 ++++ 9 files changed, 207 insertions(+) diff --git a/Config.mk b/Config.mk index b9675e61..0e4e86d8 100644 --- a/Config.mk +++ b/Config.mk @@ -220,6 +220,8 @@ CONFIG-$(lwip) += CONFIG_LWIP $(foreach i,$(CONFIG-y),$(eval $(i) ?= y)) $(foreach i,$(CONFIG-n),$(eval $(i) ?= n)) +CONFIG-val-$(CONFIG_KEXEC) += CONFIG_KEXEC_MODULE_PAGES + $(foreach i,$(CONFIG-val-y),$(eval $(i) ?= 0)) CONFIG-x += CONFIG_LIBXS diff --git a/arch/x86/kexec.c b/arch/x86/kexec.c index b33fbfc1..8c9f8a3c 100644 --- a/arch/x86/kexec.c +++ b/arch/x86/kexec.c @@ -201,10 +201,75 @@ static unsigned long kexec_param_pa; static unsigned int kexec_param_size; static unsigned long kexec_param_mem; +static struct kexec_module *kexec_check_module(void) +{ + unsigned long mod_size; + unsigned long mod; + struct kexec_module *module_ptr; + + mod = get_module(&mod_size); + if ( !mod ) + return NULL; + /* Size must be a multiple of PAGE_SIZE. */ + if ( mod_size & ~PAGE_MASK ) + return NULL; + + /* Kexec module description is at start of the last page of the module. */ + module_ptr = (void *)(mod + mod_size - (unsigned long)PAGE_SIZE); + + /* Check eye catcher. */ + if ( memcmp(module_ptr->eye_catcher, KEXECMOD_EYECATCHER, + sizeof(module_ptr->eye_catcher)) ) + return NULL; + if ( module_ptr->n_pages != (mod_size >> PAGE_SHIFT) - 1 ) + return NULL; + + kexec_mod_start = mod; + + return module_ptr; +} + +static void get_mod_addr(unsigned long from, unsigned long to) +{ + unsigned long size = PFN_PHYS(CONFIG_KEXEC_MODULE_PAGES); + + if ( to - from >= size && to - size > kexec_mod_start ) + kexec_mod_start = to - size; +} + +#define min(a, b) ((a) < (b) ? (a) : (b)) +void kexec_module(unsigned long start_pfn, unsigned long max_pfn) +{ + /* Reuse already existing kexec module. */ + mod_ptr = kexec_check_module(); + if ( !mod_ptr && CONFIG_KEXEC_MODULE_PAGES ) + { + max_pfn = min(max_pfn, PHYS_PFN(0xffffffff)); + + iterate_memory_range(PFN_PHYS(start_pfn), PFN_PHYS(max_pfn), + get_mod_addr); + BUG_ON(!kexec_mod_start); + + mod_ptr = (void *)(kexec_mod_start + + ((CONFIG_KEXEC_MODULE_PAGES - 1) << PAGE_SHIFT)); + memset(mod_ptr, 0, PAGE_SIZE); + memcpy(mod_ptr->eye_catcher, KEXECMOD_EYECATCHER, + sizeof(mod_ptr->eye_catcher)); + mod_ptr->n_pages = CONFIG_KEXEC_MODULE_PAGES - 1; + memset(mod_ptr->pg2rec, KEXECMOD_PG_FREE, mod_ptr->n_pages); + mod_ptr->recs_off = sizeof(struct kexec_module) + + mod_ptr->n_pages + (mod_ptr->n_pages & 1); + + set_reserved_range(kexec_mod_start, (unsigned long)mod_ptr + PAGE_SIZE); + } +} + void kexec_set_param_loc(const char *cmdline) { kexec_param_size = sizeof(struct hvm_start_info); kexec_param_size += e820_entries * sizeof(struct hvm_memmap_table_entry); + if ( mod_ptr ) + kexec_param_size += sizeof(struct hvm_modlist_entry); kexec_param_size += strlen(cmdline) + 1; kexec_last_addr = (kexec_last_addr + 7) & ~7UL; @@ -218,6 +283,7 @@ int kexec_get_entry(const char *cmdline) void *next; struct hvm_start_info *info; struct hvm_memmap_table_entry *mmap; + struct hvm_modlist_entry *mod; unsigned int order; unsigned int i; @@ -252,6 +318,19 @@ int kexec_get_entry(const char *cmdline) info->memmap_entries = mmap - (struct hvm_memmap_table_entry *)next; next = mmap; + if ( mod_ptr ) + { + mod = next; + memset(mod, 0, sizeof(*mod)); + info->nr_modules = 1; + info->modlist_paddr = kexec_param_pa + + (unsigned long)next - kexec_param_mem; + mod->paddr = kexec_mod_start; + mod->size = PFN_PHYS(mod_ptr->n_pages + 1); + mod->cmdline_paddr = 0; + next = mod + 1; + } + info->cmdline_paddr = kexec_param_pa + (unsigned long)next - kexec_param_mem; strcpy(next, cmdline); diff --git a/arch/x86/mm.c b/arch/x86/mm.c index f60e7d58..ebc85e0d 100644 --- a/arch/x86/mm.c +++ b/arch/x86/mm.c @@ -188,6 +188,24 @@ static struct { unsigned long size; } reserved_range[MAX_RSV_RANGES]; +void set_reserved_range(unsigned long start, unsigned long end) +{ + unsigned int i; + + for ( i = 0; i < MAX_RSV_RANGES; i++ ) + { + if ( reserved_range[i].size ) + continue; + + reserved_range[i].start = start; + reserved_range[i].size = end - start; + + return; + } + + BUG(); +} + void check_memory_range(unsigned long *from, unsigned long *to) { unsigned int m; diff --git a/arch/x86/setup.c b/arch/x86/setup.c index 2085ee5c..299ff8c7 100644 --- a/arch/x86/setup.c +++ b/arch/x86/setup.c @@ -127,6 +127,13 @@ static void print_start_of_day(void *p) printk(" cmd_line: %s\n", cmdline); printk(" stack: %p-%p\n", stack, stack + sizeof(stack)); } + +unsigned long get_module(unsigned long *size) +{ + *size = start_info_ptr->mod_len; + + return start_info_ptr->mod_start; +} #else /* @@ -182,6 +189,27 @@ static void print_start_of_day(void *p) printk(" stack: %p-%p\n", stack, stack + sizeof(stack)); arch_print_memmap(); } + +unsigned long get_module(unsigned long *size) +{ + struct hvm_modlist_entry *mod; + + if ( !hvm_start_info_ptr->nr_modules ) + return 0; + + if ( hvm_start_info_ptr->nr_modules > 1 ) + { + printk("get_module() called with more than 1 module present\n"); + printk("First module data returned\n"); + } + + mod = (struct hvm_modlist_entry *)(unsigned long) + hvm_start_info_ptr->modlist_paddr; + + *size = mod->size; + + return mod->paddr; +} #endif /* diff --git a/include/kernel.h b/include/kernel.h index 161d7571..e11b04cf 100644 --- a/include/kernel.h +++ b/include/kernel.h @@ -10,5 +10,6 @@ void post_suspend(int canceled); void do_exit(void) __attribute__((noreturn)); void arch_do_exit(void); void stop_kernel(void); +unsigned long get_module(unsigned long *size); #endif /* _KERNEL_H_ */ diff --git a/include/kexec.h b/include/kexec.h index b89c3000..b38a9f54 100644 --- a/include/kexec.h +++ b/include/kexec.h @@ -2,6 +2,72 @@ #define _KEXEC_H #include +/* + * Kexec module used to hand over memory across kexec(). + * + * This is an ABI which should be modified only in a compatible way. + * struct kexec_module is located at the start of the last page of the module. + * + * The module is usually placed towards the end of memory in order to not + * conflict with the load address of the new kernel. In order to allow for a + * resize by the new kernel after kexec(), the admin data described by struct + * kexec_module is located at the start of the last page of the module. This + * allows to add additional pages towards lower addresses. + * + * The kexec module (if configured) is being allocated at boot time in case + * no kexec module has been passed to the kernel. If a kexec module has been + * passed to the kernel, it is kept and will be passed on by kexec(). + * + * The module can contain two different kinds of information: records and + * pages. + * + * A component wanting to hand over information to the new kernel needs to + * allocate one or more records. The layout of a record is defined by the + * component using it, the layout can be changed only in a compatible way. + * + * The kexec module can contain records of multiple components. Each record + * type has a unique id which is being used to find the record in the new + * kernel instance. + * + * A record is meant to contain small amounts of information, as all records + * need to fit into the last page of the kexec module. In case more data + * needs to be handed over, one or multiple pages can be allocated within the + * kexec module. Module page allocations need to be done with the id of a + * previously allocated record, which will usually contain some information + * related to the allocated page(s). + * + * All references within the kexec module are coded as offsets relative to the + * start of the last module page. + * + * All admin data (struct kexec_module, record offset table and records) must + * fit into the last page of the module. + */ +struct kexec_module { + uint8_t eye_catcher[8]; +#define KEXECMOD_EYECATCHER "KexecMem" + uint16_t n_pages; /* Number of allocatable pages in the module. */ + uint16_t n_records; /* Size of record table (max. 255). */ +#define KEXECMOD_REC_MAX 255 + uint16_t recs_off; /* Offset to record table from start of page. */ + /* The record table is an array of */ + /* struct kexec_module_rec. */ + uint8_t pg2rec[]; /* Mapping of module pages to associated module */ + /* record. Allocated pages are indicated by */ + /* their record number (starting from 0). Free */ + /* pages have value 255. */ +#define KEXECMOD_PG_FREE 255 +}; + +struct kexec_module_rec { + uint16_t offset; /* Offset to record from start of page. */ + uint8_t type; /* Type of record. */ +#define KEXECMOD_REC_NONE 0 + uint8_t size; /* Size of record. */ +}; + +extern unsigned long kexec_mod_start; +extern struct kexec_module *mod_ptr; + /* One element of kexec actions (last element must have action KEXEC_CALL): */ struct kexec_action { enum { @@ -60,4 +126,7 @@ int kexec_move_used_pages(unsigned long boundary, unsigned long kernel, unsigned long kernel_size); void kexec_move_used_pages_undo(void); +/* Check for kexec module and create kexec memory if needed. */ +void kexec_module(unsigned long start_pfn, unsigned long max_pfn); + #endif /* _KEXEC_H */ diff --git a/include/x86/arch_mm.h b/include/x86/arch_mm.h index a1b975dc..ae56781e 100644 --- a/include/x86/arch_mm.h +++ b/include/x86/arch_mm.h @@ -289,6 +289,7 @@ unsigned long alloc_virt_kernel(unsigned n_pages); void arch_mm_pre_suspend(void); void arch_mm_post_suspend(int canceled); +void set_reserved_range(unsigned long start, unsigned long end); #ifndef CONFIG_PARAVIRT void arch_print_memmap(void); diff --git a/kexec.c b/kexec.c index 2607c819..ded29882 100644 --- a/kexec.c +++ b/kexec.c @@ -250,3 +250,6 @@ int kexec_add_action(int action, void *dest, void *src, unsigned int len) return 0; } + +unsigned long kexec_mod_start; +struct kexec_module *mod_ptr; diff --git a/mm.c b/mm.c index 8c41d2f2..b5e8d801 100644 --- a/mm.c +++ b/mm.c @@ -44,6 +44,7 @@ #include #include #include +#include /* * ALLOCATION BITMAP @@ -503,6 +504,11 @@ void init_mm(void) arch_init_mm(&start_pfn, &max_pfn); get_max_pages(); +#ifdef CONFIG_KEXEC + /* To be called after arch_init_mm() and before init_page_allocator(). */ + kexec_module(start_pfn, max_pfn); +#endif + /* Now we can initialise the page allocator. */ init_page_allocator(PFN_PHYS(start_pfn), PFN_PHYS(max_pfn)); printk("MM: done\n"); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 15 13:33:37 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 15 Jul 2025 13:33:37 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1044232.1414318 (Exim 4.92) (envelope-from ) id 1ubfmr-0007Vd-AV; 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bh=0y6tolrzUxQrHWx/8IlHGOKqrdgtUprT6TUKSYQpynQ=; b=m4OQMCDEdQ8Q2/LemCbTQ+Gq+C83J+toOJf7ct1vK4rcVkI7bqGrkUoeIk1YIj/fZom61m c1DTFC0mJws10bv4Ype5QiArxyxkdmjuN9KaiHnUge2dSt4/CvDBQHAUaS03gblcHJ4l1I Z0pH5LfRlpfmi8Z2fMhqBo1EA69WpNA= Authentication-Results: smtp-out1.suse.de; dkim=pass header.d=suse.com header.s=susede1 header.b=m4OQMCDE DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586216; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=0y6tolrzUxQrHWx/8IlHGOKqrdgtUprT6TUKSYQpynQ=; b=m4OQMCDEdQ8Q2/LemCbTQ+Gq+C83J+toOJf7ct1vK4rcVkI7bqGrkUoeIk1YIj/fZom61m c1DTFC0mJws10bv4Ype5QiArxyxkdmjuN9KaiHnUge2dSt4/CvDBQHAUaS03gblcHJ4l1I Z0pH5LfRlpfmi8Z2fMhqBo1EA69WpNA= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross , Jan Beulich Subject: [MINI-OS PATCH v2 06/14] mini-os: config: add support for config items with numerical values Date: Tue, 15 Jul 2025 15:29:28 +0200 Message-ID: <20250715132936.2798-7-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250715132936.2798-1-jgross@suse.com> References: <20250715132936.2798-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Level: X-Spam-Flag: NO X-Rspamd-Queue-Id: 330CC21204 X-Rspamd-Action: no action X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Spamd-Result: default: False [-3.01 / 50.00]; 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Signed-off-by: Juergen Gross Reviewed-by: Jan Beulich --- Config.mk | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/Config.mk b/Config.mk index e2afb1b4..b9675e61 100644 --- a/Config.mk +++ b/Config.mk @@ -178,6 +178,7 @@ endif # CONFIG-y contains all items defaulting to "y" # CONFIG-n contains all items defaulting to "n" # CONFIG-x contains all items being calculated if not set explicitly +# CONFIG-val-y contains all items with numerical values, defaulting to 0 CONFIG-y += CONFIG_START_NETWORK CONFIG-y += CONFIG_SPARSE_BSS CONFIG-y += CONFIG_BLKFRONT @@ -219,6 +220,8 @@ CONFIG-$(lwip) += CONFIG_LWIP $(foreach i,$(CONFIG-y),$(eval $(i) ?= y)) $(foreach i,$(CONFIG-n),$(eval $(i) ?= n)) +$(foreach i,$(CONFIG-val-y),$(eval $(i) ?= 0)) + CONFIG-x += CONFIG_LIBXS CONFIG_LIBXS ?= $(CONFIG_XENBUS) @@ -226,6 +229,7 @@ CONFIG-all := $(CONFIG-y) $(CONFIG-n) $(CONFIG-x) # Export config items as compiler directives $(foreach i,$(CONFIG-all),$(eval DEFINES-$($(i)) += -D$(i))) +$(foreach i,$(CONFIG-val-y),$(eval DEFINES-y += -D$(i)=$($(i)))) DEFINES-y += -D__XEN_INTERFACE_VERSION__=$(XEN_INTERFACE_VERSION) -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 15 13:33:44 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 15 Jul 2025 13:33:44 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1044234.1414322 (Exim 4.92) (envelope-from ) id 1ubfmy-0007cK-CM; 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Tue, 15 Jul 2025 13:30:27 +0000 (UTC) Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 3E4B413A68; Tue, 15 Jul 2025 13:30:27 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id CqNVDfNXdmhuNwAAD6G6ig (envelope-from ); Tue, 15 Jul 2025 13:30:27 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: deddd23f-617f-11f0-b894-0df219b8e170 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586227; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=dQG0ZTeiRyc26Tqw3qcZ1Dj3k6IjcIiutErlineQVn4=; b=NZ2ORD1YgOxFUDEQktZudNsTB9rkqxzOvgAcbLZzEyNGLXQu53e+b6Je6NJdmPTVcCK1Fg xEcWFNL09prPaYlxoLmIDRUjOZxPZIJtYlSH332HGKkHrKg2eMatccnZku4uU/3i8sMEtA ZZ9CqEWjqDzOpjrpRhZAZtrKkxBO/l4= Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586227; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=dQG0ZTeiRyc26Tqw3qcZ1Dj3k6IjcIiutErlineQVn4=; b=NZ2ORD1YgOxFUDEQktZudNsTB9rkqxzOvgAcbLZzEyNGLXQu53e+b6Je6NJdmPTVcCK1Fg xEcWFNL09prPaYlxoLmIDRUjOZxPZIJtYlSH332HGKkHrKg2eMatccnZku4uU/3i8sMEtA ZZ9CqEWjqDzOpjrpRhZAZtrKkxBO/l4= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross , Jason Andryuk Subject: [MINI-OS PATCH v2 08/14] kexec: add support for allocating pages from kexec module memory Date: Tue, 15 Jul 2025 15:29:30 +0200 Message-ID: <20250715132936.2798-9-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250715132936.2798-1-jgross@suse.com> References: <20250715132936.2798-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Level: X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.com:email,suse.com:mid,amd.com:email]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FUZZY_RATELIMITED(0.00)[rspamd.com]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; RCPT_COUNT_FIVE(0.00)[5]; RCVD_TLS_ALL(0.00)[] X-Spam-Flag: NO X-Spam-Score: -2.80 Add the needed functions for allocating and freeing memory pages of the kexec module. As the pages are always related to a kexec module record, add the related utility functions, too. For now only support adding records and retrieving them. Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- arch/x86/kexec.c | 16 +++++++ include/kexec.h | 52 +++++++++++++++++++++ kexec.c | 115 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 183 insertions(+) diff --git a/arch/x86/kexec.c b/arch/x86/kexec.c index 8c9f8a3c..e48df3f5 100644 --- a/arch/x86/kexec.c +++ b/arch/x86/kexec.c @@ -240,6 +240,9 @@ static void get_mod_addr(unsigned long from, unsigned long to) #define min(a, b) ((a) < (b) ? (a) : (b)) void kexec_module(unsigned long start_pfn, unsigned long max_pfn) { + unsigned int i; + char *rec_end; + /* Reuse already existing kexec module. */ mod_ptr = kexec_check_module(); if ( !mod_ptr && CONFIG_KEXEC_MODULE_PAGES ) @@ -257,11 +260,24 @@ void kexec_module(unsigned long start_pfn, unsigned long max_pfn) sizeof(mod_ptr->eye_catcher)); mod_ptr->n_pages = CONFIG_KEXEC_MODULE_PAGES - 1; memset(mod_ptr->pg2rec, KEXECMOD_PG_FREE, mod_ptr->n_pages); + mod_ptr->n_records = 16; mod_ptr->recs_off = sizeof(struct kexec_module) + mod_ptr->n_pages + (mod_ptr->n_pages & 1); set_reserved_range(kexec_mod_start, (unsigned long)mod_ptr + PAGE_SIZE); } + + mod_recs = (void *)((unsigned long)mod_ptr + mod_ptr->recs_off); + mod_rec_start = (char *)(mod_recs + mod_ptr->n_records); + mod_rec_end = mod_rec_start; + for ( i = 0; i < mod_ptr->n_records; i++ ) + { + if ( mod_recs[i].type == KEXECMOD_REC_NONE ) + continue; + rec_end = (char *)mod_ptr + mod_recs[i].offset + mod_recs[i].size; + if ( mod_rec_end < rec_end ) + mod_rec_end = rec_end; + } } void kexec_set_param_loc(const char *cmdline) diff --git a/include/kexec.h b/include/kexec.h index b38a9f54..0e0b1a4d 100644 --- a/include/kexec.h +++ b/include/kexec.h @@ -67,6 +67,9 @@ struct kexec_module_rec { extern unsigned long kexec_mod_start; extern struct kexec_module *mod_ptr; +extern struct kexec_module_rec *mod_recs; +extern char *mod_rec_start; +extern char *mod_rec_end; /* One element of kexec actions (last element must have action KEXEC_CALL): */ struct kexec_action { @@ -80,6 +83,17 @@ struct kexec_action { void *src; }; +#ifdef CONFIG_KEXEC +unsigned long kexec_alloc_mod_pages(unsigned int recid, unsigned int n); +void kexec_free_mod_pages(unsigned int recid, unsigned long addr, + unsigned int n); +int kexec_find_mod_record(unsigned int start_idx, unsigned int type, + unsigned int *size); +int kexec_add_mod_record(unsigned int type, void *addr, unsigned int size); +int kexec_upd_mod_record(unsigned int idx, unsigned int type, + void *addr, unsigned int size); +int kexec_read_mod_record(unsigned int idx, void *addr, unsigned int size); + #define KEXEC_MAX_ACTIONS 16 extern char _kexec_start[], _kexec_end[]; @@ -129,4 +143,42 @@ void kexec_move_used_pages_undo(void); /* Check for kexec module and create kexec memory if needed. */ void kexec_module(unsigned long start_pfn, unsigned long max_pfn); +#else /* CONFIG_KEXEC */ +static inline unsigned long kexec_alloc_mod_pages(unsigned int recid, + unsigned int n) +{ + return 0; +} + +static inline void kexec_free_mod_pages(unsigned int recid, unsigned long addr, + unsigned int n) +{ +} + +static inline int kexec_find_mod_record(unsigned int start_idx, + unsigned int type, unsigned int *size) +{ + return 0; +} + +static inline int kexec_add_mod_record(unsigned int type, void *addr, + unsigned int size) +{ + return 0; +} + +static inline int kexec_upd_mod_record(unsigned int idx, unsigned int type, + void *addr, unsigned int size) +{ + return 0; +} + +static inline int kexec_read_mod_record(unsigned int idx, void *addr, + unsigned int size) +{ + return 0; +} + +#endif + #endif /* _KEXEC_H */ diff --git a/kexec.c b/kexec.c index ded29882..f17ed13d 100644 --- a/kexec.c +++ b/kexec.c @@ -253,3 +253,118 @@ int kexec_add_action(int action, void *dest, void *src, unsigned int len) unsigned long kexec_mod_start; struct kexec_module *mod_ptr; +struct kexec_module_rec *mod_recs; +char *mod_rec_start; +char *mod_rec_end; + +unsigned long kexec_alloc_mod_pages(unsigned int recid, unsigned int n) +{ + unsigned int first = 0, i; + + for ( i = 0; i < mod_ptr->n_pages; i++ ) + { + if ( i - first == n - 1 ) + { + for ( i = 0; i < n; i++ ) + mod_ptr->pg2rec[first + i] = recid; + + return kexec_mod_start + PFN_PHYS(first); + } + + if ( mod_ptr->pg2rec[i] != KEXECMOD_PG_FREE ) + first = i + 1; + } + + printk("Kexec module out of memory\n"); + BUG(); +} + +void kexec_free_mod_pages(unsigned int recid, unsigned long addr, + unsigned int n) +{ + unsigned int s = PHYS_PFN(addr - kexec_mod_start); + unsigned int i; + + BUG_ON(addr < kexec_mod_start || + addr + PFN_PHYS(n) > (unsigned long)mod_ptr); + + for ( i = 0; i < n; i++ ) + { + BUG_ON(mod_ptr->pg2rec[s + i] != recid); + mod_ptr->pg2rec[s + i] = KEXECMOD_PG_FREE; + } +} + +int kexec_find_mod_record(unsigned int start_idx, unsigned int type, + unsigned int *size) +{ + unsigned int i; + + for ( i = start_idx; i < mod_ptr->n_records; i++ ) + { + if ( mod_recs[i].type == type ) + { + *size = mod_recs[i].size; + return i; + } + } + + return -ENOENT; +} + +int kexec_add_mod_record(unsigned int type, void *addr, unsigned int size) +{ + unsigned int i; + + if ( mod_rec_end + size > (char *)mod_ptr + PAGE_SIZE ) + { + /* TODO: support compressing record space. */ + printk("Kexec module record space exhausted\n"); + BUG(); + } + + for ( i = 0; i < mod_ptr->n_records; i++ ) + { + if ( mod_recs[i].type == KEXECMOD_REC_NONE ) + { + mod_recs[i].offset = mod_rec_end - (char *)mod_ptr; + mod_recs[i].type = type; + mod_recs[i].size = size; + memcpy(mod_rec_end, addr, size); + mod_rec_end = mod_rec_end + size; + + return i; + } + } + + /* TODO: support extending the mod_recs[] table. */ + printk("Kexec module record table exhausted\n"); + BUG(); +} + +int kexec_upd_mod_record(unsigned int idx, unsigned int type, + void *addr, unsigned int size) +{ + if ( idx >= mod_ptr->n_records ) + return -ENOENT; + + if ( mod_recs[idx].type != type || mod_recs[idx].size != size ) + return -EINVAL; + + memcpy((char *)mod_ptr + mod_recs[idx].offset, addr, size); + + return 0; +} + +int kexec_read_mod_record(unsigned int idx, void *addr, unsigned int size) +{ + if ( idx >= mod_ptr->n_records ) + return -ENOENT; + + if ( mod_recs[idx].size != size ) + return -EINVAL; + + memcpy(addr, (char *)mod_ptr + mod_recs[idx].offset, size); + + return 0; +} -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 15 13:41:09 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 15 Jul 2025 13:41:09 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1044280.1414346 (Exim 4.92) (envelope-from ) id 1ubfu8-00025H-Gj; Tue, 15 Jul 2025 13:41:08 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1044280.1414346; Tue, 15 Jul 2025 13:41:08 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubfu8-00025A-EC; 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none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586261; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=k9Ov6pkpfp6346PXkACunqlof0M0Xfob950IWGq5/2o=; b=GZgJlpoCBy+rYCDCt4IbafXbgqpl7nET9XN3Z8IvzapYnhSQIfRN7P7X0t8ca0gaKPQjI8 FbQoTHshPOX6mKwlzmIesG3LbhPVl8eSDNCf6oCv17uUGZs3ghCQfRt6jbVWFTXcK7QjJc CYAoE4PphUscjM2FCT5hCV9SxiNLZao= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross , Jason Andryuk Subject: [MINI-OS PATCH v2 14/14] events: export bind_evtchn() Date: Tue, 15 Jul 2025 15:29:36 +0200 Message-ID: <20250715132936.2798-15-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250715132936.2798-1-jgross@suse.com> References: <20250715132936.2798-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[99.99%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_COUNT_TWO(0.00)[2]; TO_DN_SOME(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_ALL(0.00)[]; RCPT_COUNT_FIVE(0.00)[5]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:mid,suse.com:email,imap1.dmz-prg2.suse.org:helo,amd.com:email] X-Spam-Flag: NO X-Spam-Level: X-Spam-Score: -2.80 Export the bind_evtchn() function, as it will be needed for reactivating events after kexec(). Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- events.c | 1 + 1 file changed, 1 insertion(+) diff --git a/events.c b/events.c index 9f3dbf05..a9c1ccac 100644 --- a/events.c +++ b/events.c @@ -98,6 +98,7 @@ evtchn_port_t bind_evtchn(evtchn_port_t port, evtchn_handler_t handler, return port; } +EXPORT_SYMBOL(bind_evtchn); void unbind_evtchn(evtchn_port_t port ) { -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 15 13:41:28 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 15 Jul 2025 13:41:28 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1044288.1414361 (Exim 4.92) (envelope-from ) id 1ubfuS-0002Yy-PD; Tue, 15 Jul 2025 13:41:28 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1044288.1414361; Tue, 15 Jul 2025 13:41:28 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubfuS-0002Yr-MF; 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dkim=pass header.d=suse.com header.s=susede1 header.b="p/7QFB4n" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586244; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GLfH1LKxnn3oOigKVk3XV6ShMXvMzS6b7PXnQ2kQXXs=; b=p/7QFB4nJJxHcGoO0p90ZsKb8AQ/FSSiNolqN547AV75koHJ6BbNHONl0s8FKPY8SE2pJD 2BInMhZvaBE+aSacd8h0k1od6iUxKwCLJ/txB40uX9bJu7NlItJIxT4LUX/UreB545gOq+ MQdF0loPTarsPNO7ErzDs6qoyH05vL0= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross , Jason Andryuk Subject: [MINI-OS PATCH v2 11/14] gnttab: remove gnttab_alloc_and_grant() function Date: Tue, 15 Jul 2025 15:29:33 +0200 Message-ID: <20250715132936.2798-12-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250715132936.2798-1-jgross@suse.com> References: <20250715132936.2798-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; MIME_TRACE(0.00)[0:+]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; TO_DN_SOME(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; ARC_NA(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:104:10:150:64:97:from]; FROM_EQ_ENVFROM(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_TLS_ALL(0.00)[]; DKIM_TRACE(0.00)[suse.com:+]; RCPT_COUNT_FIVE(0.00)[5]; DBL_BLOCKED_OPENRESOLVER(0.00)[amd.com:email,imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns,suse.com:mid,suse.com:dkim,suse.com:email] X-Spam-Flag: NO X-Spam-Level: X-Rspamd-Queue-Id: 4D18721239 X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Action: no action X-Spam-Score: -3.01 The last user of gnttab_alloc_and_grant() is gone. Remove gnttab_alloc_and_grant() as it is doing more harm than good. It is hard coded to only grant access for dom0, which is not really clear from looking at the function name. It would be possible to add a domid parameter, but given its now 0 users, there doesn't seem to be a real demand for that function. Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- gnttab.c | 13 ------------- include/gnttab.h | 1 - 2 files changed, 14 deletions(-) diff --git a/gnttab.c b/gnttab.c index 5b04ab01..6bac0905 100644 --- a/gnttab.c +++ b/gnttab.c @@ -149,19 +149,6 @@ gnttab_end_transfer(grant_ref_t ref) } EXPORT_SYMBOL(gnttab_end_transfer); -grant_ref_t -gnttab_alloc_and_grant(void **map) -{ - unsigned long mfn; - grant_ref_t gref; - - *map = (void *)alloc_page(); - mfn = virt_to_mfn(*map); - gref = gnttab_grant_access(0, mfn, 0); - return gref; -} -EXPORT_SYMBOL(gnttab_alloc_and_grant); - static const char * const gnttabop_error_msgs[] = GNTTABOP_error_msgs; const char * diff --git a/include/gnttab.h b/include/gnttab.h index 974cb89d..108c4425 100644 --- a/include/gnttab.h +++ b/include/gnttab.h @@ -4,7 +4,6 @@ #include void init_gnttab(void); -grant_ref_t gnttab_alloc_and_grant(void **map); grant_ref_t gnttab_grant_access(domid_t domid, unsigned long frame, int readonly); grant_ref_t gnttab_grant_transfer(domid_t domid, unsigned long pfn); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 15 13:42:19 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 15 Jul 2025 13:42:19 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1044301.1414374 (Exim 4.92) (envelope-from ) id 1ubfvH-0003ID-1w; Tue, 15 Jul 2025 13:42:19 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1044301.1414374; Tue, 15 Jul 2025 13:42:19 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubfvG-0003I9-Vh; Tue, 15 Jul 2025 13:42:18 +0000 Received: by outflank-mailman (input) for mailman id 1044301; Tue, 15 Jul 2025 13:42:18 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubfkJ-00013q-FN for minios-devel@lists.xenproject.org; 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Tue, 15 Jul 2025 13:30:55 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: f03252cd-617f-11f0-a319-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586256; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=hRAM08+RsDuhPyXv0NnzQdGBRwKZEE1NwpnhwhZY1kI=; b=czyLtKC/4apootecF9icytHIoHa0Kv34P32ozcD39gFmaWi9oa7P8kVXqhtg5P/vK0WoXW yw8tsOZWIrBoB/Gp8LH3zGLH9HYPJLryzaEA8cXc1SePVGfZczy8NHEX/cbda23ggz3SOg VkDBlxcW5jJCBc9R9Cc/Yc1ovRlEAIY= Authentication-Results: smtp-out1.suse.de; dkim=pass header.d=suse.com header.s=susede1 header.b=ogtWD3F3 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586255; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=hRAM08+RsDuhPyXv0NnzQdGBRwKZEE1NwpnhwhZY1kI=; b=ogtWD3F3SCbMTuMQPElx1+pug0hrUlsNm8lu/XlSrCBsqlohAQCCl4R4pVdL/YTY8VhzWC NJYI4LUBwvWxUZwQ739YLAPfX0F7fCxN80DTSsXCMs9Pt6F84UwYOI0G39zjHKdi+3Sr9W 96Eb5dF2Do1G4Dn950Cm2AKXdiz4Re0= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross , Jason Andryuk Subject: [MINI-OS PATCH v2 13/14] 9pfs: add support to keep device opened across kexec Date: Tue, 15 Jul 2025 15:29:35 +0200 Message-ID: <20250715132936.2798-14-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250715132936.2798-1-jgross@suse.com> References: <20250715132936.2798-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Level: X-Spam-Flag: NO X-Rspamd-Queue-Id: 843B721204 X-Rspamd-Action: no action X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; MIME_TRACE(0.00)[0:+]; FUZZY_RATELIMITED(0.00)[rspamd.com]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; TO_DN_SOME(0.00)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; ARC_NA(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:104:10:150:64:97:from]; FROM_EQ_ENVFROM(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_TLS_ALL(0.00)[]; DKIM_TRACE(0.00)[suse.com:+]; RCPT_COUNT_FIVE(0.00)[5]; DBL_BLOCKED_OPENRESOLVER(0.00)[amd.com:email,imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo,suse.com:dkim,suse.com:mid,suse.com:email] X-Spam-Score: -3.01 In order to support Xenstore-stubdom live update, the 9pfs device used to save and restore the Xenstore state needs to be kept open across kexec, as otherwise re-opening of the device using the new kernel would not work (this would require Xenstore to be active, which is obviously not possible before having read the saved state). Add an alternative init function for a 9pfs device supporting to take the configuration from the kexec module instead of Xenstore. Add support for creating the device using the kexec module, too. Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- 9pfront.c | 120 +++++++++++++++++++++++++++++++++++++++++----- include/9pfront.h | 9 ++++ include/kexec.h | 1 + 3 files changed, 117 insertions(+), 13 deletions(-) diff --git a/9pfront.c b/9pfront.c index 8da2f726..b3106d13 100644 --- a/9pfront.c +++ b/9pfront.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -26,6 +27,7 @@ struct dev_9pfs { unsigned int dom; char *backend; char bepath[64]; + bool kexecmem; char *tag; const char *mnt; @@ -58,6 +60,13 @@ struct dev_9pfs { unsigned long long fid_mask; /* Bit mask for free fids. */ }; +struct kexec_9pfs_rec { + grant_ref_t ring_ref; + evtchn_port_t evtchn; + RING_IDX prod_pvt_out; + RING_IDX cons_pvt_in; +}; + struct file_9pfs { uint32_t fid; struct dev_9pfs *dev; @@ -898,7 +907,7 @@ static bool path_canonical(const char *pathname) return true; } -static int connect_9pfs(struct dev_9pfs *dev) +static int connect_9pfs(struct dev_9pfs *dev, bool do_attach) { int ret; @@ -906,7 +915,7 @@ static int connect_9pfs(struct dev_9pfs *dev) if ( ret ) return ret; - return p9_attach(dev); + return do_attach ? p9_attach(dev) : 0; } static void intr_9pfs(evtchn_port_t port, struct pt_regs *regs, void *data) @@ -1079,6 +1088,9 @@ static int open_9pfs(struct mount_point *mnt, const char *pathname, int flags, return -1; } +static int kexec_recid = -1; +static struct dev_9pfs *kexec_dev; + static void free_9pfront(struct dev_9pfs *dev) { unsigned int i; @@ -1087,13 +1099,22 @@ static void free_9pfront(struct dev_9pfs *dev) { for ( i = 0; i < (1 << dev->ring_order); i++ ) gnttab_end_access(dev->intf->ref[i]); - free_pages(dev->data.in, dev->ring_order); + if ( dev->kexecmem ) + kexec_free_mod_pages(kexec_recid, (unsigned long)dev->data.in, + 1 << dev->ring_order); + else + free_pages(dev->data.in, dev->ring_order); } unbind_evtchn(dev->evtchn); gnttab_end_access(dev->ring_ref); - free_page(dev->intf); + if ( dev->kexecmem ) + kexec_free_mod_pages(kexec_recid, (unsigned long)dev->intf, 1); + else + free_page(dev->intf); free(dev->backend); free(dev->tag); + if ( dev == kexec_dev ) + kexec_dev = NULL; free(dev); } @@ -1111,7 +1132,7 @@ static bool issue_err(struct dev_9pfs *dev, char *msg, char *reason) return false; } -static bool read_config_xs(struct dev_9pfs *dev) +static bool read_config_xs(struct dev_9pfs *dev, struct kexec_9pfs_rec *rec) { char *msg; char *reason = ""; @@ -1121,7 +1142,9 @@ static bool read_config_xs(struct dev_9pfs *dev) char *v; void *addr; unsigned int i; + unsigned int n_pages; int retry = 1; + int err; msg = xenbus_read_unsigned(XBT_NIL, dev->nodename, "backend-id", &dev->dom); if ( msg ) @@ -1177,7 +1200,9 @@ static bool read_config_xs(struct dev_9pfs *dev) return issue_err(dev, msg, reason); } - dev->intf = (void *)alloc_page(); + dev->intf = (void *)(dev->kexecmem + ? kexec_alloc_mod_pages(kexec_recid, 1) + : alloc_page()); if ( !dev->intf ) { reason = "couldn't allocate shared interface page"; @@ -1191,14 +1216,17 @@ static bool read_config_xs(struct dev_9pfs *dev) return issue_err(dev, msg, reason); } dev->intf->ring_order = dev->ring_order; - dev->data.in = (void *)alloc_pages(dev->ring_order); + n_pages = 1 << dev->ring_order; + dev->data.in = (void *)(dev->kexecmem + ? kexec_alloc_mod_pages(kexec_recid, n_pages) + : alloc_pages(dev->ring_order)); if ( !dev->data.in ) { reason = "couldn't allocate ring pages"; return issue_err(dev, msg, reason); } dev->data.out = dev->data.in + XEN_FLEX_RING_SIZE(dev->ring_order); - for ( i = 0; i < (1 << dev->ring_order); i++ ) + for ( i = 0; i < n_pages; i++ ) { addr = dev->data.in + i * PAGE_SIZE; dev->intf->ref[i] = gnttab_grant_access(dev->dom, virt_to_mfn(addr), 0); @@ -1256,18 +1284,65 @@ static bool read_config_xs(struct dev_9pfs *dev) if ( msg ) return issue_err(dev, msg, reason); + if ( dev->kexecmem ) + { + rec->ring_ref = dev->ring_ref; + rec->evtchn = dev->evtchn; + err = kexec_upd_mod_record(kexec_recid, KEXECMOD_REC_9PFS, rec, + sizeof(*rec)); + BUG_ON(err); + } + return true; } -void *init_9pfront(unsigned int id, const char *mnt) +#ifdef CONFIG_KEXEC +static int kexec_9pfront(bool undo) +{ + struct kexec_9pfs_rec rec; + + if ( kexec_recid < 0 || !kexec_dev || undo ) + return 0; + + kexec_read_mod_record(kexec_recid, &rec, sizeof(rec)); + rec.prod_pvt_out = kexec_dev->prod_pvt_out; + rec.cons_pvt_in = kexec_dev->cons_pvt_in; + kexec_upd_mod_record(kexec_recid, KEXECMOD_REC_9PFS, &rec, sizeof(rec)); + + return 0; +} +kexec_call(kexec_9pfront); +#endif + +static void read_config_kexec(struct dev_9pfs *dev, struct kexec_9pfs_rec *rec) +{ + dev->ring_ref = rec->ring_ref; + dev->evtchn = rec->evtchn; + dev->prod_pvt_out = rec->prod_pvt_out; + dev->cons_pvt_in = rec->cons_pvt_in; + + dev->intf = gnttab_get_addr(dev->ring_ref); + dev->ring_order = dev->intf->ring_order; + dev->data.in = gnttab_get_addr(dev->intf->ref[0]); + dev->data.out = dev->data.in + XEN_FLEX_RING_SIZE(dev->ring_order); + + bind_evtchn(dev->evtchn, intr_9pfs, dev); +} + +void *init_9pfront2(unsigned int id, const char *mnt, unsigned int flags) { struct dev_9pfs *dev; char *reason = ""; unsigned int i; + struct kexec_9pfs_rec record = { }; + unsigned int rec_size; - printk("9pfsfront add %u, for mount at %s\n", id, mnt); + printk("9pfsfront add %u, for mount at %s, flags %x\n", id, mnt, flags); dev = malloc(sizeof(*dev)); memset(dev, 0, sizeof(*dev)); + dev->kexecmem = flags & (INIT9P_FLAG_KEXEC | INIT9P_FLAG_REINIT); + if ( dev->kexecmem ) + kexec_dev = dev; snprintf(dev->nodename, sizeof(dev->nodename), "device/9pfs/%u", id); dev->id = id; init_waitqueue_head(&dev->waitq); @@ -1282,12 +1357,25 @@ void *init_9pfront(unsigned int id, const char *mnt) } dev->free_reqs = 0; - if ( !read_config_xs(dev) ) - goto err_out; + if ( !(flags & INIT9P_FLAG_REINIT) ) + { + if ( dev->kexecmem ) + kexec_recid = kexec_add_mod_record(KEXECMOD_REC_9PFS, &record, + sizeof(record)); + if ( !read_config_xs(dev, &record) ) + goto err_out; + } + else + { + kexec_recid = kexec_find_mod_record(0, KEXECMOD_REC_9PFS, &rec_size); + BUG_ON(kexec_recid < 0 || rec_size != sizeof(record)); + kexec_read_mod_record(kexec_recid, &record, rec_size); + read_config_kexec(dev, &record); + } unmask_evtchn(dev->evtchn); - if ( connect_9pfs(dev) ) + if ( connect_9pfs(dev, !(flags & INIT9P_FLAG_REINIT)) ) { reason = "9pfs connect failed"; goto err; @@ -1309,6 +1397,12 @@ void *init_9pfront(unsigned int id, const char *mnt) free_9pfront(dev); return NULL; } +EXPORT_SYMBOL(init_9pfront2); + +void *init_9pfront(unsigned int id, const char *mnt) +{ + return init_9pfront2(id, mnt, 0); +} EXPORT_SYMBOL(init_9pfront); void shutdown_9pfront(void *dev) diff --git a/include/9pfront.h b/include/9pfront.h index 722ec564..a0cb5487 100644 --- a/include/9pfront.h +++ b/include/9pfront.h @@ -2,6 +2,15 @@ #define __9PFRONT_H__ void *init_9pfront(unsigned int id, const char *mnt); +void *init_9pfront2(unsigned int id, const char *mnt, unsigned int flags); +#ifdef CONFIG_KEXEC +#define INIT9P_FLAG_REINIT 0x01 /* Reinit with data from kexec module. */ +#define INIT9P_FLAG_KEXEC 0x02 /* Use kexec module for interface. */ +#else +#define INIT9P_FLAG_REINIT 0 +#define INIT9P_FLAG_KEXEC 0 +#endif + void shutdown_9pfront(void *dev); #endif /* __9PFRONT_H__ */ diff --git a/include/kexec.h b/include/kexec.h index 0e0b1a4d..93dd9498 100644 --- a/include/kexec.h +++ b/include/kexec.h @@ -62,6 +62,7 @@ struct kexec_module_rec { uint16_t offset; /* Offset to record from start of page. */ uint8_t type; /* Type of record. */ #define KEXECMOD_REC_NONE 0 +#define KEXECMOD_REC_9PFS 1 uint8_t size; /* Size of record. */ }; -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 15 13:43:04 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 15 Jul 2025 13:43:04 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1044315.1414389 (Exim 4.92) (envelope-from ) id 1ubfw0-00046P-DA; Tue, 15 Jul 2025 13:43:04 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1044315.1414389; Tue, 15 Jul 2025 13:43:04 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubfw0-00046I-9m; 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none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586249; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=qDdBMgPeFsba0l0VzAB0puq0dCuMoWTPG49f+ImrdcA=; b=LmdRnlhEs6TXrS+snNhPQYHPcF+kgZ2u3X1P+LE40RH8d7w/IPWOzdynZX4LktCkzywV1s bVsnTLEgf3G9aDTBI7zFT4zmDMKS90Xhz41fVTCv0VxTuSjKzwseEdEyQ/yuQMTeXZJRdX Fwx5jZZeZWDTKYresiqaiqCzkipp5/8= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross , Jason Andryuk Subject: [MINI-OS PATCH v2 12/14] gnttab: add function to obtain memory address from grantref Date: Tue, 15 Jul 2025 15:29:34 +0200 Message-ID: <20250715132936.2798-13-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250715132936.2798-1-jgross@suse.com> References: <20250715132936.2798-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Level: X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[amd.com:email,imap1.dmz-prg2.suse.org:helo,suse.com:email,suse.com:mid]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FUZZY_RATELIMITED(0.00)[rspamd.com]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; RCPT_COUNT_FIVE(0.00)[5]; RCVD_TLS_ALL(0.00)[] X-Spam-Flag: NO X-Spam-Score: -2.80 Add a new function gnttab_get_addr() to obtain a memory pointer for a given grant reference. Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- gnttab.c | 10 ++++++++++ include/gnttab.h | 1 + 2 files changed, 11 insertions(+) diff --git a/gnttab.c b/gnttab.c index 6bac0905..52d6792a 100644 --- a/gnttab.c +++ b/gnttab.c @@ -149,6 +149,16 @@ gnttab_end_transfer(grant_ref_t ref) } EXPORT_SYMBOL(gnttab_end_transfer); +void *gnttab_get_addr(grant_ref_t ref) +{ + BUG_ON(ref >= NR_GRANT_ENTRIES || ref < NR_RESERVED_ENTRIES); + + if ( !gnttab_table[ref].flags ) + return NULL; + + return mfn_to_virt(gnttab_table[ref].frame); +} + static const char * const gnttabop_error_msgs[] = GNTTABOP_error_msgs; const char * diff --git a/include/gnttab.h b/include/gnttab.h index 108c4425..46e72a36 100644 --- a/include/gnttab.h +++ b/include/gnttab.h @@ -9,6 +9,7 @@ grant_ref_t gnttab_grant_access(domid_t domid, unsigned long frame, grant_ref_t gnttab_grant_transfer(domid_t domid, unsigned long pfn); unsigned long gnttab_end_transfer(grant_ref_t gref); int gnttab_end_access(grant_ref_t ref); +void *gnttab_get_addr(grant_ref_t ref); const char *gnttabop_error(int16_t status); void fini_gnttab(void); void suspend_gnttab(void); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 15 13:47:05 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 15 Jul 2025 13:47:05 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1044378.1414483 (Exim 4.92) (envelope-from ) id 1ubfzt-0001Hq-2O; Tue, 15 Jul 2025 13:47:05 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1044378.1414483; Tue, 15 Jul 2025 13:47:05 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubfzs-0001Hi-Vr; Tue, 15 Jul 2025 13:47:04 +0000 Received: by outflank-mailman (input) for mailman id 1044378; Tue, 15 Jul 2025 13:47:03 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubfk0-0000p6-LT for minios-devel@lists.xenproject.org; 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Tue, 15 Jul 2025 13:30:38 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: e599e9a1-617f-11f0-b894-0df219b8e170 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586238; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=38MURIeQcvW07nQrk81rmZlwZXuyDK1rVnhs1KCrhZU=; b=c1vpseNsi/SwDGMMkhljgTGs3AMj5ICaSrIboJX8YcQ0pIvkoSY80isEOnycFVXnUV0x5N wpQ3RWLmXMcy4Q/JQ5mCJwsRiwDxK8mh/pFCkFIOL42lWO2O2pWcD1lyydM5BBsktH+0HR PlEGu0dVgqBoPdkzW2wG+C8u193crjs= Authentication-Results: smtp-out2.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586238; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=38MURIeQcvW07nQrk81rmZlwZXuyDK1rVnhs1KCrhZU=; b=c1vpseNsi/SwDGMMkhljgTGs3AMj5ICaSrIboJX8YcQ0pIvkoSY80isEOnycFVXnUV0x5N wpQ3RWLmXMcy4Q/JQ5mCJwsRiwDxK8mh/pFCkFIOL42lWO2O2pWcD1lyydM5BBsktH+0HR PlEGu0dVgqBoPdkzW2wG+C8u193crjs= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross , Jason Andryuk Subject: [MINI-OS PATCH v2 10/14] 9pfs: refactor init_9pfront() Date: Tue, 15 Jul 2025 15:29:32 +0200 Message-ID: <20250715132936.2798-11-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250715132936.2798-1-jgross@suse.com> References: <20250715132936.2798-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.com:mid,suse.com:email,amd.com:email]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FUZZY_RATELIMITED(0.00)[rspamd.com]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; RCPT_COUNT_FIVE(0.00)[5]; RCVD_TLS_ALL(0.00)[] X-Spam-Flag: NO X-Spam-Level: X-Spam-Score: -2.80 Move the Xenstore and backend interface related handling into a sub-function in order to prepare supporting reconnecting to an active 9pfs device after kexec. Don't use gnttab_alloc_and_grant(), as this will hard code to use dom0 as backend. Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- 9pfront.c | 136 ++++++++++++++++++++++++++++++++++-------------------- 1 file changed, 86 insertions(+), 50 deletions(-) diff --git a/9pfront.c b/9pfront.c index 2bfc49b1..8da2f726 100644 --- a/9pfront.c +++ b/9pfront.c @@ -1097,68 +1097,65 @@ static void free_9pfront(struct dev_9pfs *dev) free(dev); } -void *init_9pfront(unsigned int id, const char *mnt) +static bool issue_err(struct dev_9pfs *dev, char *msg, char *reason) +{ + if ( msg ) + { + printk("9pfsfront add %u failed, error %s accessing Xenstore\n", + dev->id, msg); + free(msg); + } + else + printk("9pfsfront add %u failed, %s\n", dev->id, reason); + + return false; +} + +static bool read_config_xs(struct dev_9pfs *dev) { - struct dev_9pfs *dev; char *msg; char *reason = ""; - xenbus_transaction_t xbt; - int retry = 1; XenbusState state; - unsigned int i; - void *addr; + xenbus_transaction_t xbt; char *version; char *v; - - printk("9pfsfront add %u, for mount at %s\n", id, mnt); - dev = malloc(sizeof(*dev)); - memset(dev, 0, sizeof(*dev)); - snprintf(dev->nodename, sizeof(dev->nodename), "device/9pfs/%u", id); - dev->id = id; - init_waitqueue_head(&dev->waitq); - init_SEMAPHORE(&dev->ring_out_sem, 1); - init_SEMAPHORE(&dev->ring_in_sem, 1); - dev->fid_mask = ~0ULL; - - for ( i = 0; i < N_REQS; i++ ) - { - dev->req[i].id = i; - dev->req[i].next_free = i + 1; - } - dev->free_reqs = 0; + void *addr; + unsigned int i; + int retry = 1; msg = xenbus_read_unsigned(XBT_NIL, dev->nodename, "backend-id", &dev->dom); if ( msg ) - goto err; + return issue_err(dev, msg, reason); msg = xenbus_read_string(XBT_NIL, dev->nodename, "backend", &dev->backend); if ( msg ) - goto err; + return issue_err(dev, msg, reason); msg = xenbus_read_string(XBT_NIL, dev->nodename, "tag", &dev->tag); if ( msg ) - goto err; + return issue_err(dev, msg, reason); snprintf(dev->bepath, sizeof(dev->bepath), "%s/state", dev->backend); free(xenbus_watch_path_token(XBT_NIL, dev->bepath, dev->bepath, &dev->events)); + state = xenbus_read_integer(dev->bepath); while ( msg == NULL && state < XenbusStateInitWait ) msg = xenbus_wait_for_state_change(dev->bepath, &state, &dev->events); if ( msg || state != XenbusStateInitWait ) { reason = "illegal backend state"; - goto err; + return issue_err(dev, msg, reason); } msg = xenbus_read_unsigned(XBT_NIL, dev->backend, "max-ring-page-order", &dev->ring_order); if ( msg ) - goto err; + return issue_err(dev, msg, reason); if ( dev->ring_order > DEFAULT_9PFS_RING_ORDER ) dev->ring_order = DEFAULT_9PFS_RING_ORDER; msg = xenbus_read_string(XBT_NIL, dev->backend, "versions", &version); if ( msg ) - goto err; + return issue_err(dev, msg, reason); for ( v = version; *v; v++ ) { if ( strtoul(v, &v, 10) == 1 && (*v == ',' || *v == 0) ) @@ -1170,25 +1167,36 @@ void *init_9pfront(unsigned int id, const char *mnt) { reason = "backend published illegal version string"; free(version); - goto err; + return issue_err(dev, msg, reason); } } free(version); if ( v ) { reason = "backend doesn't support version 1"; - goto err; + return issue_err(dev, msg, reason); } - dev->ring_ref = gnttab_alloc_and_grant((void **)&dev->intf); + dev->intf = (void *)alloc_page(); + if ( !dev->intf ) + { + reason = "couldn't allocate shared interface page"; + return issue_err(dev, msg, reason); + } memset(dev->intf, 0, PAGE_SIZE); + dev->ring_ref = gnttab_grant_access(dev->dom, virt_to_mfn(dev->intf), 0); if ( evtchn_alloc_unbound(dev->dom, intr_9pfs, dev, &dev->evtchn) ) { reason = "no event channel"; - goto err; + return issue_err(dev, msg, reason); } dev->intf->ring_order = dev->ring_order; dev->data.in = (void *)alloc_pages(dev->ring_order); + if ( !dev->data.in ) + { + reason = "couldn't allocate ring pages"; + return issue_err(dev, msg, reason); + } dev->data.out = dev->data.in + XEN_FLEX_RING_SIZE(dev->ring_order); for ( i = 0; i < (1 << dev->ring_order); i++ ) { @@ -1204,30 +1212,35 @@ void *init_9pfront(unsigned int id, const char *mnt) free(msg); msg = NULL; reason = "starting transaction"; - goto err; + return issue_err(dev, msg, reason); } msg = xenbus_printf(xbt, dev->nodename, "version", "%u", 1); if ( msg ) - goto err_tr; + break; msg = xenbus_printf(xbt, dev->nodename, "num-rings", "%u", 1); if ( msg ) - goto err_tr; + break; msg = xenbus_printf(xbt, dev->nodename, "ring-ref0", "%u", dev->ring_ref); if ( msg ) - goto err_tr; + break; msg = xenbus_printf(xbt, dev->nodename, "event-channel-0", "%u", dev->evtchn); if ( msg ) - goto err_tr; + break; msg = xenbus_printf(xbt, dev->nodename, "state", "%u", XenbusStateInitialised); if ( msg ) - goto err_tr; + break; free(xenbus_transaction_end(xbt, 0, &retry)); } + if ( msg ) + { + free(xenbus_transaction_end(xbt, 1, &retry)); + return issue_err(dev, msg, reason); + } state = xenbus_read_integer(dev->bepath); while ( msg == NULL && state < XenbusStateConnected ) @@ -1235,13 +1248,42 @@ void *init_9pfront(unsigned int id, const char *mnt) if ( msg || state != XenbusStateConnected ) { reason = "illegal backend state"; - goto err; + return issue_err(dev, msg, reason); } msg = xenbus_printf(XBT_NIL, dev->nodename, "state", "%u", XenbusStateConnected); if ( msg ) - goto err; + return issue_err(dev, msg, reason); + + return true; +} + +void *init_9pfront(unsigned int id, const char *mnt) +{ + struct dev_9pfs *dev; + char *reason = ""; + unsigned int i; + + printk("9pfsfront add %u, for mount at %s\n", id, mnt); + dev = malloc(sizeof(*dev)); + memset(dev, 0, sizeof(*dev)); + snprintf(dev->nodename, sizeof(dev->nodename), "device/9pfs/%u", id); + dev->id = id; + init_waitqueue_head(&dev->waitq); + init_SEMAPHORE(&dev->ring_out_sem, 1); + init_SEMAPHORE(&dev->ring_in_sem, 1); + dev->fid_mask = ~0ULL; + + for ( i = 0; i < N_REQS; i++ ) + { + dev->req[i].id = i; + dev->req[i].next_free = i + 1; + } + dev->free_reqs = 0; + + if ( !read_config_xs(dev) ) + goto err_out; unmask_evtchn(dev->evtchn); @@ -1260,17 +1302,11 @@ void *init_9pfront(unsigned int id, const char *mnt) return dev; - err_tr: - free(xenbus_transaction_end(xbt, 1, &retry)); - err: - if ( msg ) - printk("9pfsfront add %u failed, error %s accessing Xenstore\n", - id, msg); - else - printk("9pfsfront add %u failed, %s\n", id, reason); + printk("9pfsfront add %u failed, %s\n", id, reason); + + err_out: free_9pfront(dev); - free(msg); return NULL; } EXPORT_SYMBOL(init_9pfront); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 15 17:40:04 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 15 Jul 2025 17:40:04 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1044649.1414742 (Exim 4.92) (envelope-from ) id 1ubjdJ-0001B6-Sr; Tue, 15 Jul 2025 17:40:01 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1044649.1414742; Tue, 15 Jul 2025 17:40:01 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubjdJ-000190-MO; Tue, 15 Jul 2025 17:40:01 +0000 Received: by outflank-mailman (input) for mailman id 1044649; Tue, 15 Jul 2025 17:40:00 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ubjdI-00016c-Lb for minios-devel@lists.xenproject.org; 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pr=C Message-ID: <58471142-5193-4a44-a2f1-d829604ad962@amd.com> Date: Tue, 15 Jul 2025 13:39:47 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH v2 01/14] mm: don't add module pages to free memory To: Juergen Gross , , CC: References: <20250715132936.2798-1-jgross@suse.com> <20250715132936.2798-2-jgross@suse.com> Content-Language: en-US From: Jason Andryuk In-Reply-To: <20250715132936.2798-2-jgross@suse.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF00036F41:EE_|SN7PR12MB7201:EE_ X-MS-Office365-Filtering-Correlation-Id: 9711f2bc-7c42-40c8-7116-08ddc3c697cc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|1800799024|376014|7053199007; X-Microsoft-Antispam-Message-Info: =?utf-8?B?dE5rZTZ4Q0NhenpjZWV6TUIrVnBGd21JTG1qMXEzWXUxcGIzeVpzblAyWDhK?= =?utf-8?B?VHZiRmtpTVdiL2pFeWEyejh4RldES3NBdnM1YU9NREVIK2MxdTEwZXE4TVVx?= =?utf-8?B?WVMxVW9aeXJrZ2xUajd6M1JraUFkNVUzUlJwenNxanY3K2tQdndUdDh3bXFV?= =?utf-8?B?Q1hRN1d6WUlUejB2UTEwcExsc0RzSWhIUU80THNzbzRMMUNxdXhSVWZvZXU5?= =?utf-8?B?Y1dLSzdLRG1xUC8wcEkvQ0hyeVcwb01IZS92WVdFZzYwd204bG9zQ2FJa2ph?= =?utf-8?B?bXYybDNxTUVmbDdUZXo2SkRONldUaDJGUitMRHU4MEJHcWRZQURqVklVampX?= =?utf-8?B?KzNNK3lOTHlYRHBTa0NrZlkxYXFRdTFndkFGRXhTeGNSbUYxNUtiRFNjRVpV?= =?utf-8?B?bTlEeThiZDRXRVpUbkZvK3RQNitIeW9DMVhXMTRLZW82Zm1BUXNCN2dZeGNL?= =?utf-8?B?b3FZbDkreFNHdmE4eFhjeDFOTmY4VG9pSy9NQjNDa3lhamJudy9kQ0M4dktH?= =?utf-8?B?Z0FUKzMvcWV3bEVyL1VTU09JZUsvTGpjMWxuK25TcVJVUW5aRy9QV3plRTZx?= =?utf-8?B?bGJxTEpDQ2xBRlZMRXdzZUNEZnFXMDVsZDFXK2JNUGNWNVdiS1dpT1R3ZmZC?= =?utf-8?B?eWEwMVdXU1NGa2J6NUIySWpvdGRab3Z2YnR2Z3o5OEs2Tlh6Uks4MUZ5eFR5?= =?utf-8?B?NGNpRlRFeEtySk1XK0ZWNFJZTkY1V3Z2ZDBSdFJUUkhNc2pFWTRabVdlVnNV?= =?utf-8?B?SGEzN3NjZFNleUM1eTdSQ1p5akZXZVc5aGk5bVdoeUtEV0l6c0tMcHJ0bTEr?= =?utf-8?B?Zk9ucXVlaDJyUy9taCtXQWdoZ2NDRHRsV0ZuR3ZwZ00rcHNyZ0FwdWM4TVZ1?= =?utf-8?B?VlBLdnZFak9YcEYzNlFQeFBXaXFacHBINnd1RThobFUzUWlacjdwcEMxanJx?= =?utf-8?B?a1dnVjZUb1JicEx1NjIrYkE1UU1vM1NuSk5Jd1dnQTlCRExkSFB1aXNLTHh2?= =?utf-8?B?cnR6SHVOemViRFg3RXdLY0IwYzhHMkJwQUsxUWsxMlIrZ2NpQm1lLzd1eTZ4?= =?utf-8?B?WWFsM1NhNy9SNnBpOVJ1aEgvaGxDU2FzNnZZUlVuQjF1OE5wWVdvN0ZleHRN?= =?utf-8?B?bXVRRUt3VXRrcXlyaXlSMVFkcEk5RVJOL05kUkFlcExDNTAreWE2aFpYYzZp?= =?utf-8?B?N0VUNkdlUS83Ny9GTlFOZlFRV2hId281ZG5janJoZ3Q2TnVKaWlZTzhNQW1N?= =?utf-8?B?bzdXYmY0RFJzeGd5QlA1cllscUd3YVVXK2lBNVlZdGZXT0wvUWMramoxNFZP?= =?utf-8?B?TDlKcWJmdTd5MGFleEdjZ0JkYVlkU09lcThqVVM2dzczWHJRbWpkR0hVTTVn?= =?utf-8?B?bGFKT0hEczhBL3pyTVEvNjhPck5ZOVM1WmgzTUpBMk1rZWlZSmtPTVlkb0Fo?= =?utf-8?B?NEljY1YrY3FFdlRQMlZsQWpMSHFIY2hmNDVvZHM3azVMVDBod1FJQ2hXaFov?= =?utf-8?B?ckZ6Zm9iMzZ2a0hqSjlQeGFWWUZrUWFlQTRIUDR5Tmxlcjlhb2haU3Jsd0d0?= =?utf-8?B?b1htSElQVlpmbWN4STExU3VHamc4ZFFZQng2WXVnaTI1c3gzZ3NtZE5GY1NT?= =?utf-8?B?TCtyV2dzSHljc3EraVE4a0hIQXNrZzVocmEzaHFmaEpvSjJlYXoxTFJUNGly?= =?utf-8?B?QXZ3dUcwYkhyWFZRbXZyeTRjNUxZSzZqUzdUTXJjQUhJVmlMU0lRbHQwaUt6?= =?utf-8?B?c0syc3VVZVowTXVSN1FOMmlvb093MVNtMWVVZ2dSdHV2UnpVSVZMSDZmbHRD?= =?utf-8?B?MDRvaTFodHAzVmNGVzlEOER1UnZhOU9zVGRmUW5MMTVraW1IdDhiY1hPNUxT?= =?utf-8?B?ZnFhL1BoRmdXNmNPQU5XclFPQVhWRkpFb2NHMlJsblFBVXpscllMTTZzK2FU?= =?utf-8?B?ZXpaZ3FVNm4yek02UjJLemNvY3pUdnhiMkFMZUlwdllVQVVwMUhXcG5NQjhW?= =?utf-8?B?anZrRzlUOThMMDR3S1ZUQkl1THBKZWFPZjJ2NTNPQU16T3NwNG5EYmhLWnAv?= =?utf-8?Q?uzkr8t?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(82310400026)(36860700013)(1800799024)(376014)(7053199007);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Jul 2025 17:39:47.3542 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9711f2bc-7c42-40c8-7116-08ddc3c697cc X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF00036F41.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB7201 On 2025-07-15 09:29, Juergen Gross wrote: > When initializing the memory allocator, don't add memory pages of > modules and the initial boot info structure to the free memory. > > This is relevant only when running in PVH mode, as in PV mode only > memory above the initial page tables is added to free memory, and the > module and start_info pages are below the page tables. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Tue Jul 15 17:56:36 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 15 Jul 2025 17:56:36 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1044660.1414751 (Exim 4.92) (envelope-from ) id 1ubjtK-0004Bp-Uh; 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pr=C Message-ID: Date: Tue, 15 Jul 2025 13:56:17 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH v2 07/14] mini-os: kexec: add support for handing over some memory across kexec To: Juergen Gross , , CC: References: <20250715132936.2798-1-jgross@suse.com> <20250715132936.2798-8-jgross@suse.com> Content-Language: en-US From: Jason Andryuk In-Reply-To: <20250715132936.2798-8-jgross@suse.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: None (SATLEXMB04.amd.com: jason.andryuk@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS3PEPF000099E0:EE_|CY8PR12MB7268:EE_ X-MS-Office365-Filtering-Correlation-Id: cae929da-3cbd-4978-c877-08ddc3c8e59d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|376014|36860700013|1800799024|7053199007; X-Microsoft-Antispam-Message-Info: =?utf-8?B?SmNRYStVL1JsMmFTZ3RwbFMwVk95TWZJQ0VxdStvbEdSUXk1S3V4TVRmN0Iz?= =?utf-8?B?YjFKSHJYTlhGSTZjY1hyVXZTc1k3V3pkQ2EvckpkYzBTZmUyeXd6aFJIbmZp?= =?utf-8?B?bkNZbHh3VXZOQjZRalN2WE4rZnpoeS8xbGJxMzlZNGFqTGhwUHZlQUZBV2J3?= =?utf-8?B?Q1drSHd6dkdJcEorWUpjWm5ocGl6TEZ1K1d5aVYvS2lsbW5iMTM4TlZENkJN?= =?utf-8?B?TVRqL1JHeVdMOENXbkczcUVPYlJZU1JwcU81bHNMN2h5WHhEb3dzaFk3T0lD?= =?utf-8?B?UWtVd3ZLanFlS0NrK1hQdXloUWhEODBvZjgzTENRY3Vnb2dpKy9SRFdvUG5k?= =?utf-8?B?MzQxdDZzTkE5dlZqakN0bWFjT3F0enVsc1dmQy9yYThQaVBrdlk3ZDUvMDk2?= =?utf-8?B?YVFjaWxEUS9IK2w0RFhhYnV4Uzl5K1hMUGVQSkxpUldPeStQRVpLK3V2d2p1?= =?utf-8?B?ZEtlek1FUE9ORUg4RnVxWVI0a2ZqbzFlNWJwdThxVkJzNndzNjgrcEZsNWl4?= =?utf-8?B?N1pxalRuUHJEUmxVSkJ2elFsU0VwekR1MnRybktBcFRUc1dwTWhuQTcxaGpD?= =?utf-8?B?eHRZemRtd0xDeVl6dG1VOWgyZ1Y0NThtZW9IZ1ZaTXFPSjFraDZ0V3NZKytj?= =?utf-8?B?VkZKMG5oV09WTUg0YmdRYW4xM0pYbmhjbTA3YVdWUEtaQWt5cnQ1VVRlSmU1?= =?utf-8?B?VnJDSnMzS3ZqYUlWc3REYkhxVXI4bzhhUDlrWkRJUDhRVXA5dmFFL1VBVEhX?= =?utf-8?B?NjRFVE5SN2NndVdKakZBRG0xNVlIMGM1NFh3WnZIMlo1Y29DTzJYTzFKSmRU?= =?utf-8?B?ck1PWm5ha1VMYVB2SHhSeDFnZE85OU9kaVNoR2NaelE2VDZyNDVkeUJZSVBI?= =?utf-8?B?UXMySzdibyswVXgvMmZLTU9XS2xRL1hkTGVyMFpOdGIwVUxMVHZCdUhPNHVJ?= =?utf-8?B?Y1dBemhuRXEyMEQxdis0SHYvTHNYalhhcWZRVTdnU3h4YU9OdFMreHpLbUJw?= =?utf-8?B?YUZhTzNhbi96c01OaEY0UVdVWFZjbTdrcnNBSThuVlhrREJVRTByL1Jickxm?= =?utf-8?B?RTlJQmIrTUpHSHcyMXVHVUtjYmk4dGpxdWhDUHBIV29mSDlhL3RkUGwvNVc3?= =?utf-8?B?VmNwZjhFNTZwYS93bXBmczhnT2R4NTM1UHVTd3g0Y3BCcE5ZM0JaTmpCS2Jp?= =?utf-8?B?NGIwZnJ1Y2JiaWFyS2FQRmYxOUl6MUFIcUZPQ3hoSjZmT1lhRTgweGYraWd3?= =?utf-8?B?MkUxVFh2S2Rlb3BUZTZPN09DR3FqVkJLYTFNT1VhR0hmVVV4RzlidGpjb25i?= =?utf-8?B?d3kyRjFqWHdJSjRRODN1SmhVNnNlOEFpSVFiL0ZXWjZ6NHBCbnMvcmZ1TU13?= =?utf-8?B?czE4bldUU251d0ErNzV6a2RMYWNuTURZVzZ0NWhrTEI5SVF0NFB0UDh3V3ly?= =?utf-8?B?aWxwb3hoM3RLMk4wV1ZxdzcxdnlRMk4wcnJXUWRPUGdNT0lTOXU4MXBUTWdW?= =?utf-8?B?TmhLMkRaN0EzMGpGanp6R1c5NEFsdGpxc1JEWTlMZEJsbUtwNzJFaGYyWTlU?= =?utf-8?B?MFlYM2JDV2JnY2ZKeHcyVjJ2bGl3WjhWZ28rRVZYbFozU2JyWlNmL3hKUXNz?= =?utf-8?B?L0FvZjJ6WERuUUtGempXT0hBelVYOC9kUVc5ZXVUaXJwOXUzYXo0WTRDL3Bx?= =?utf-8?B?U3pFNzJNRXFkbzJHdlNaZTdHRGZYUHgxcnJ1djVvM094NXdxMzNhUWlMeVc0?= =?utf-8?B?bE5ITDFTb2ZOL2NOUDlVS1FiNFNudDQycWpPTlNaM2twTzZ4NDByTDlmN3Fu?= =?utf-8?B?TmU1NlJNZytZeU5VNzJLdktnd0lkV1hud2hmb0R1aHpNdWRlUGhGazB3R1pp?= =?utf-8?B?QTg4ODEweHJjUmxLNWNuMGNyanFjNWlaaEdjZmVJUkNaYkRFcFZ6YkVMQUJ3?= =?utf-8?B?ZmFMWmplNmN2UUtlc1VHNktzMWdFVXNGZy9SVVVad3ZEbE40ZWZPMmNTNEsv?= =?utf-8?B?eVYzekRyQWZ2b2FHQzR4MDdLWm4yRFpOaGxzWXZrM1VkejdTVWZWVnlBK3pF?= =?utf-8?Q?dY2/Dd?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(82310400026)(376014)(36860700013)(1800799024)(7053199007);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Jul 2025 17:56:16.8863 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cae929da-3cbd-4978-c877-08ddc3c8e59d X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS3PEPF000099E0.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB7268 On 2025-07-15 09:29, Juergen Gross wrote: > Especially for support of Xenstore-stubdom live update some memory must > be handed over to the new kernel without moving it around: as the > 9pfs device used for storing and retrieving the state of Xenstore > needs to be kept operational across kexec (it can't be reopened due to > Xenstore not being available without access to the device), the ring > pages need to be accessible via active grants by the backend all the > time. > > Add the basic support for that by reserving a pre-defined number of > memory pages at the top of the memory. This memory area will be > handed over to the new kernel via specifying it as a module in > struct hvm_start_info. > > The contents of the memory area are described via a generic table of > contents in the last page of the memory. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk Thanks for the expanded comment. 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Thu, 17 Jul 2025 04:58:22 -0700 (PDT) Message-ID: <7e9a8486-b60d-4929-bb37-275578a53359@suse.com> Date: Thu, 17 Jul 2025 13:58:21 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] kexec: initialize kexec_page in kexec() To: Jan Beulich , Minios-devel Cc: "xen-devel@lists.xenproject.org" , Samuel Thibault References: Content-Language: en-US From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= Autocrypt: addr=jgross@suse.com; keydata= xsBNBFOMcBYBCACgGjqjoGvbEouQZw/ToiBg9W98AlM2QHV+iNHsEs7kxWhKMjrioyspZKOB ycWxw3ie3j9uvg9EOB3aN4xiTv4qbnGiTr3oJhkB1gsb6ToJQZ8uxGq2kaV2KL9650I1SJve dYm8Of8Zd621lSmoKOwlNClALZNew72NjJLEzTalU1OdT7/i1TXkH09XSSI8mEQ/ouNcMvIJ NwQpd369y9bfIhWUiVXEK7MlRgUG6MvIj6Y3Am/BBLUVbDa4+gmzDC9ezlZkTZG2t14zWPvx XP3FAp2pkW0xqG7/377qptDmrk42GlSKN4z76ELnLxussxc7I2hx18NUcbP8+uty4bMxABEB AAHNH0p1ZXJnZW4gR3Jvc3MgPGpncm9zc0BzdXNlLmNvbT7CwHkEEwECACMFAlOMcK8CGwMH CwkIBwMCAQYVCAIJCgsEFgIDAQIeAQIXgAAKCRCw3p3WKL8TL8eZB/9G0juS/kDY9LhEXseh mE9U+iA1VsLhgDqVbsOtZ/S14LRFHczNd/Lqkn7souCSoyWsBs3/wO+OjPvxf7m+Ef+sMtr0 G5lCWEWa9wa0IXx5HRPW/ScL+e4AVUbL7rurYMfwCzco+7TfjhMEOkC+va5gzi1KrErgNRHH kg3PhlnRY0Udyqx++UYkAsN4TQuEhNN32MvN0Np3WlBJOgKcuXpIElmMM5f1BBzJSKBkW0Jc Wy3h2Wy912vHKpPV/Xv7ZwVJ27v7KcuZcErtptDevAljxJtE7aJG6WiBzm+v9EswyWxwMCIO RoVBYuiocc51872tRGywc03xaQydB+9R7BHPzsBNBFOMcBYBCADLMfoA44MwGOB9YT1V4KCy vAfd7E0BTfaAurbG+Olacciz3yd09QOmejFZC6AnoykydyvTFLAWYcSCdISMr88COmmCbJzn sHAogjexXiif6ANUUlHpjxlHCCcELmZUzomNDnEOTxZFeWMTFF9Rf2k2F0Tl4E5kmsNGgtSa aMO0rNZoOEiD/7UfPP3dfh8JCQ1VtUUsQtT1sxos8Eb/HmriJhnaTZ7Hp3jtgTVkV0ybpgFg w6WMaRkrBh17mV0z2ajjmabB7SJxcouSkR0hcpNl4oM74d2/VqoW4BxxxOD1FcNCObCELfIS auZx+XT6s+CE7Qi/c44ibBMR7hyjdzWbABEBAAHCwF8EGAECAAkFAlOMcBYCGwwACgkQsN6d 1ii/Ey9D+Af/WFr3q+bg/8v5tCknCtn92d5lyYTBNt7xgWzDZX8G6/pngzKyWfedArllp0Pn fgIXtMNV+3t8Li1Tg843EXkP7+2+CQ98MB8XvvPLYAfW8nNDV85TyVgWlldNcgdv7nn1Sq8g HwB2BHdIAkYce3hEoDQXt/mKlgEGsLpzJcnLKimtPXQQy9TxUaLBe9PInPd+Ohix0XOlY+Uk QFEx50Ki3rSDl2Zt2tnkNYKUCvTJq7jvOlaPd6d/W0tZqpyy7KVay+K4aMobDsodB3dvEAs6 ScCnh03dDAFgIq5nsB11j3KPKdVoPlfucX2c7kGNH+LUMbzqV6beIENfNexkOfxHfw== In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------leRpBkDw7ZErbrP6OxPFVhm8" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------leRpBkDw7ZErbrP6OxPFVhm8 Content-Type: multipart/mixed; boundary="------------laIjdsOscujjxeOpHoIrzVIi"; protected-headers="v1" From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= To: Jan Beulich , Minios-devel Cc: "xen-devel@lists.xenproject.org" , Samuel Thibault Message-ID: <7e9a8486-b60d-4929-bb37-275578a53359@suse.com> Subject: Re: [PATCH] kexec: initialize kexec_page in kexec() References: In-Reply-To: Autocrypt-Gossip: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJ3BBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AAIQkQoDSui/t3IH4WIQQ+pJkfkcoLMCa4X6CgNK6L+3cgfgn7AJ9DmMd0SMJE ePbc7/m22D2v04iu7ACffXTdZQhNl557tJuDXZSBxDmW/tLOwU0EWTecRBAIAIK5OMKMU5R2 Lk2bbjgX7vyQuCFFyKf9rC/4itNwhYWFSlKzVj3WJBDsoi2KvPm7AI+XB6NIkNAkshL5C0kd pcNd5Xo0jRR5/WE/bT7LyrJ0OJWS/qUit5eNNvsO+SxGAk28KRa1ieVLeZi9D03NL0+HIAtZ tecfqwgl3Y72UpLUyt+r7LQhcI/XR5IUUaD4C/chB4Vq2QkDKO7Q8+2HJOrFIjiVli4lU+Sf OBp64m//Y1xys++Z4ODoKh7tkh5DxiO3QBHG7bHK0CSQsJ6XUvPVYubAuy1XfSDzSeSBl//C v78Fclb+gi9GWidSTG/4hsEzd1fY5XwCZG/XJJY9M/sAAwUH/09Ar9W2U1Qm+DwZeP2ii3Ou 14Z9VlVVPhcEmR/AFykL9dw/OV2O/7cdi52+l00reUu6Nd4Dl8s4f5n8b1YFzmkVVIyhwjvU jxtPyUgDOt6DRa+RaDlXZZmxQyWcMv2anAgYWGVszeB8Myzsw8y7xhBEVV1S+1KloCzw4V8Z DSJrcsZlyMDoiTb7FyqxwQnM0f6qHxWbmOOnbzJmBqpNpFuDcz/4xNsymJylm6oXiucHQBAP Xb/cE1YNHpuaH4SRhIxwQilCYEznWowQphNAbJtEKOmcocY7EbSt8VjXTzmYENkIfkrHRyXQ dUm5AoL51XZljkCqNwrADGkTvkwsWSvCSQQYEQIACQUCWTecRAIbDAAKCRCgNK6L+3cgfuef AJ9wlZQNQUp0KwEf8Tl37RmcxCL4bQCcC5alCSMzUBJ5DBIcR4BY+CyQFAs= --------------laIjdsOscujjxeOpHoIrzVIi Content-Type: multipart/mixed; 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Fixes: 560c2a5584c4 ("mini-os: kexec: do the final kexec step") Signed-off-by: Jan Beulich --- In the meantime I'll revert the MiniOS commit update in the main tree. --- a/kexec.c +++ b/kexec.c @@ -168,7 +168,7 @@ int kexec(void *kernel, unsigned long kernel_size, const char *cmdline) { int ret; unsigned long *func; - void *kexec_page; + void *kexec_page = NULL; ret = analyze_kernel(kernel, kernel_size); if ( ret ) From minios-devel-bounces@lists.xenproject.org Thu Jul 17 12:05:01 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Thu, 17 Jul 2025 12:05:01 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1046690.1417073 (Exim 4.92) (envelope-from ) id 1ucNMB-0000q7-Gf; Thu, 17 Jul 2025 12:04:59 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1046690.1417073; Thu, 17 Jul 2025 12:04:59 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ucNMB-0000q0-E3; Thu, 17 Jul 2025 12:04:59 +0000 Received: by outflank-mailman (input) for mailman id 1046690; Thu, 17 Jul 2025 12:04:58 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ucNMA-0000po-58 for minios-devel@lists.xenproject.org; Thu, 17 Jul 2025 12:04:58 +0000 Received: from mail-wr1-x431.google.com (mail-wr1-x431.google.com [2a00:1450:4864:20::431]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 4188a724-6306-11f0-a319-13f23c93f187; Thu, 17 Jul 2025 14:04:57 +0200 (CEST) Received: by mail-wr1-x431.google.com with SMTP id ffacd0b85a97d-3a50fc7ac4dso393927f8f.0 for ; Thu, 17 Jul 2025 05:04:57 -0700 (PDT) Received: from [10.156.60.236] (ip-037-024-206-209.um08.pools.vodafone-ip.de. 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Thu, 17 Jul 2025 05:04:56 -0700 (PDT) Message-ID: <8219b634-c6d8-43e4-82f6-b5622fd7afdd@suse.com> Date: Thu, 17 Jul 2025 14:04:47 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] kexec: initialize kexec_page in kexec() To: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= Cc: "xen-devel@lists.xenproject.org" , Samuel Thibault , Minios-devel References: <7e9a8486-b60d-4929-bb37-275578a53359@suse.com> Content-Language: en-US From: Jan Beulich Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: <7e9a8486-b60d-4929-bb37-275578a53359@suse.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 17.07.2025 13:58, Jürgen Groß wrote: > On 17.07.25 13:53, Jan Beulich wrote: >> For the error patch to not see it uninitialized. >> >> Fixes: 560c2a5584c4 ("mini-os: kexec: do the final kexec step") >> Signed-off-by: Jan Beulich > > Reviewed-by: Juergen Gross Thanks. The revert actually didn't help, the problem was already introduced earlier. I now don't understand how things built previously. I'll re-apply the patch bumping the new revision to this about-to-be-committed fix. 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Thu, 17 Jul 2025 05:13:23 -0700 (PDT) Message-ID: Date: Thu, 17 Jul 2025 14:13:22 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] kexec: initialize kexec_page in kexec() To: Jan Beulich Cc: "xen-devel@lists.xenproject.org" , Samuel Thibault , Minios-devel References: <7e9a8486-b60d-4929-bb37-275578a53359@suse.com> <8219b634-c6d8-43e4-82f6-b5622fd7afdd@suse.com> Content-Language: en-US From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= Autocrypt: addr=jgross@suse.com; keydata= xsBNBFOMcBYBCACgGjqjoGvbEouQZw/ToiBg9W98AlM2QHV+iNHsEs7kxWhKMjrioyspZKOB ycWxw3ie3j9uvg9EOB3aN4xiTv4qbnGiTr3oJhkB1gsb6ToJQZ8uxGq2kaV2KL9650I1SJve dYm8Of8Zd621lSmoKOwlNClALZNew72NjJLEzTalU1OdT7/i1TXkH09XSSI8mEQ/ouNcMvIJ NwQpd369y9bfIhWUiVXEK7MlRgUG6MvIj6Y3Am/BBLUVbDa4+gmzDC9ezlZkTZG2t14zWPvx XP3FAp2pkW0xqG7/377qptDmrk42GlSKN4z76ELnLxussxc7I2hx18NUcbP8+uty4bMxABEB AAHNH0p1ZXJnZW4gR3Jvc3MgPGpncm9zc0BzdXNlLmNvbT7CwHkEEwECACMFAlOMcK8CGwMH CwkIBwMCAQYVCAIJCgsEFgIDAQIeAQIXgAAKCRCw3p3WKL8TL8eZB/9G0juS/kDY9LhEXseh mE9U+iA1VsLhgDqVbsOtZ/S14LRFHczNd/Lqkn7souCSoyWsBs3/wO+OjPvxf7m+Ef+sMtr0 G5lCWEWa9wa0IXx5HRPW/ScL+e4AVUbL7rurYMfwCzco+7TfjhMEOkC+va5gzi1KrErgNRHH kg3PhlnRY0Udyqx++UYkAsN4TQuEhNN32MvN0Np3WlBJOgKcuXpIElmMM5f1BBzJSKBkW0Jc Wy3h2Wy912vHKpPV/Xv7ZwVJ27v7KcuZcErtptDevAljxJtE7aJG6WiBzm+v9EswyWxwMCIO RoVBYuiocc51872tRGywc03xaQydB+9R7BHPzsBNBFOMcBYBCADLMfoA44MwGOB9YT1V4KCy vAfd7E0BTfaAurbG+Olacciz3yd09QOmejFZC6AnoykydyvTFLAWYcSCdISMr88COmmCbJzn sHAogjexXiif6ANUUlHpjxlHCCcELmZUzomNDnEOTxZFeWMTFF9Rf2k2F0Tl4E5kmsNGgtSa aMO0rNZoOEiD/7UfPP3dfh8JCQ1VtUUsQtT1sxos8Eb/HmriJhnaTZ7Hp3jtgTVkV0ybpgFg w6WMaRkrBh17mV0z2ajjmabB7SJxcouSkR0hcpNl4oM74d2/VqoW4BxxxOD1FcNCObCELfIS auZx+XT6s+CE7Qi/c44ibBMR7hyjdzWbABEBAAHCwF8EGAECAAkFAlOMcBYCGwwACgkQsN6d 1ii/Ey9D+Af/WFr3q+bg/8v5tCknCtn92d5lyYTBNt7xgWzDZX8G6/pngzKyWfedArllp0Pn fgIXtMNV+3t8Li1Tg843EXkP7+2+CQ98MB8XvvPLYAfW8nNDV85TyVgWlldNcgdv7nn1Sq8g HwB2BHdIAkYce3hEoDQXt/mKlgEGsLpzJcnLKimtPXQQy9TxUaLBe9PInPd+Ohix0XOlY+Uk QFEx50Ki3rSDl2Zt2tnkNYKUCvTJq7jvOlaPd6d/W0tZqpyy7KVay+K4aMobDsodB3dvEAs6 ScCnh03dDAFgIq5nsB11j3KPKdVoPlfucX2c7kGNH+LUMbzqV6beIENfNexkOfxHfw== In-Reply-To: <8219b634-c6d8-43e4-82f6-b5622fd7afdd@suse.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------30BNi0wzQPxtpTIECb10a3nr" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------30BNi0wzQPxtpTIECb10a3nr Content-Type: multipart/mixed; boundary="------------xT3J57SJ12hJn2Ra814w2q0i"; protected-headers="v1" From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= To: Jan Beulich Cc: "xen-devel@lists.xenproject.org" , Samuel Thibault , Minios-devel Message-ID: Subject: Re: [PATCH] kexec: initialize kexec_page in kexec() References: <7e9a8486-b60d-4929-bb37-275578a53359@suse.com> <8219b634-c6d8-43e4-82f6-b5622fd7afdd@suse.com> In-Reply-To: <8219b634-c6d8-43e4-82f6-b5622fd7afdd@suse.com> Autocrypt-Gossip: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJ3BBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AAIQkQoDSui/t3IH4WIQQ+pJkfkcoLMCa4X6CgNK6L+3cgfgn7AJ9DmMd0SMJE ePbc7/m22D2v04iu7ACffXTdZQhNl557tJuDXZSBxDmW/tLOwU0EWTecRBAIAIK5OMKMU5R2 Lk2bbjgX7vyQuCFFyKf9rC/4itNwhYWFSlKzVj3WJBDsoi2KvPm7AI+XB6NIkNAkshL5C0kd pcNd5Xo0jRR5/WE/bT7LyrJ0OJWS/qUit5eNNvsO+SxGAk28KRa1ieVLeZi9D03NL0+HIAtZ tecfqwgl3Y72UpLUyt+r7LQhcI/XR5IUUaD4C/chB4Vq2QkDKO7Q8+2HJOrFIjiVli4lU+Sf OBp64m//Y1xys++Z4ODoKh7tkh5DxiO3QBHG7bHK0CSQsJ6XUvPVYubAuy1XfSDzSeSBl//C v78Fclb+gi9GWidSTG/4hsEzd1fY5XwCZG/XJJY9M/sAAwUH/09Ar9W2U1Qm+DwZeP2ii3Ou 14Z9VlVVPhcEmR/AFykL9dw/OV2O/7cdi52+l00reUu6Nd4Dl8s4f5n8b1YFzmkVVIyhwjvU jxtPyUgDOt6DRa+RaDlXZZmxQyWcMv2anAgYWGVszeB8Myzsw8y7xhBEVV1S+1KloCzw4V8Z DSJrcsZlyMDoiTb7FyqxwQnM0f6qHxWbmOOnbzJmBqpNpFuDcz/4xNsymJylm6oXiucHQBAP Xb/cE1YNHpuaH4SRhIxwQilCYEznWowQphNAbJtEKOmcocY7EbSt8VjXTzmYENkIfkrHRyXQ dUm5AoL51XZljkCqNwrADGkTvkwsWSvCSQQYEQIACQUCWTecRAIbDAAKCRCgNK6L+3cgfuef AJ9wlZQNQUp0KwEf8Tl37RmcxCL4bQCcC5alCSMzUBJ5DBIcR4BY+CyQFAs= --------------xT3J57SJ12hJn2Ra814w2q0i Content-Type: multipart/mixed; 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Mon, 28 Jul 2025 07:09:12 -0700 (PDT) Message-ID: <7705ed0a-7fbe-4e0e-8752-2acd0a76583e@suse.com> Date: Mon, 28 Jul 2025 16:09:05 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 1/2] mm: provide a way to do very early page table allocations To: Juergen Gross Cc: samuel.thibault@ens-lyon.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org References: <20250708063738.18994-1-jgross@suse.com> <20250708063738.18994-2-jgross@suse.com> Content-Language: en-US From: Jan Beulich Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: <20250708063738.18994-2-jgross@suse.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 08.07.2025 08:37, Juergen Gross wrote: > Add a small pool of statically allocated memory pages to be handed out > for very early page table allocations. > > This will make it possible to do virtual allocations e.g. for mapping > the shared info page. > > Signed-off-by: Juergen Gross > --- > arch/x86/mm.c | 16 +++++++++++++++- > 1 file changed, 15 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/mm.c b/arch/x86/mm.c > index bdff38fd..3f5c7ea7 100644 > --- a/arch/x86/mm.c > +++ b/arch/x86/mm.c > @@ -640,12 +640,17 @@ void change_readonly(bool readonly) > * return a valid PTE for a given virtual address. If PTE does not exist, > * allocate page-table pages. > */ > +#define N_PTS 4 Wouldn't it be prudent to have a comment here mentioning how this number was derived, i.e. what's known to be covered? (To map the shared info page I expect you really only need 3? Hence without a comment things may remain unclear.) > +static char early_pt[PAGE_SIZE * N_PTS] __attribute__((aligned(PAGE_SIZE))); Maybe better early_pt[N_PTS][PAGE_SIZE], simplifying the allocation code below a little? > +static unsigned long n_early_pt = N_PTS; unsigned int would do, I expect? With the suggestion above this could then also use ARRAY_SIZE(), at which point there would be no real need for N_PTS anymore. > static int need_pgt_func(unsigned long va, unsigned int lvl, bool is_leaf, > pgentry_t *pte, void *par) > { > pgentry_t **result = par; > unsigned long pt_mfn; > unsigned long pt_pfn; > + unsigned long pt_addr; > unsigned int idx; > > if ( !is_leaf ) > @@ -664,7 +669,16 @@ static int need_pgt_func(unsigned long va, unsigned int lvl, bool is_leaf, > } > > pt_mfn = virt_to_mfn(pte); > - pt_pfn = virt_to_pfn(alloc_page()); > + if ( n_early_pt ) > + { > + n_early_pt--; > + pt_addr = (unsigned long)&early_pt[n_early_pt * PAGE_SIZE]; > + } > + else > + { > + pt_addr = alloc_page(); > + } The failure pattern when one fails to increase early_pt[] is likely going to be problematic. Wouldn't it be better to check for failure here? 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Mon, 28 Jul 2025 07:21:31 -0700 (PDT) Message-ID: Date: Mon, 28 Jul 2025 16:21:23 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 2/2] x86: don't use a memory page for mapping the shared info page To: Juergen Gross Cc: samuel.thibault@ens-lyon.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org References: <20250708063738.18994-1-jgross@suse.com> <20250708063738.18994-3-jgross@suse.com> Content-Language: en-US From: Jan Beulich Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: <20250708063738.18994-3-jgross@suse.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 08.07.2025 08:37, Juergen Gross wrote: > --- a/hypervisor.c > +++ b/hypervisor.c > @@ -27,8 +27,10 @@ > > #include > #include > +#include > #include > #include > +#include > #include > > EXPORT_SYMBOL(hypercall_page); > @@ -37,7 +39,8 @@ EXPORT_SYMBOL(hypercall_page); > ((sh)->evtchn_pending[idx] & ~(sh)->evtchn_mask[idx]) > > #ifndef CONFIG_PARAVIRT > -extern shared_info_t shared_info; > +static unsigned long shinfo_pfn; > +static unsigned long shinfo_va; > > int hvm_get_parameter(int idx, uint64_t *value) > { > @@ -69,14 +72,16 @@ shared_info_t *map_shared_info(void) > { > struct xen_add_to_physmap xatp; > > + shinfo_pfn = e820_get_reserved_pfns(1); > xatp.domid = DOMID_SELF; > xatp.idx = 0; > xatp.space = XENMAPSPACE_shared_info; > - xatp.gpfn = virt_to_pfn(&shared_info); > + xatp.gpfn = shinfo_pfn; > if ( HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp) != 0 ) > BUG(); > + shinfo_va = map_frame_virt(shinfo_pfn); In the PV variant you first check whether you already have a VA. Why is that needed there, but not here? (Originally I meant to ask why you don't use map_frame_virt() there as well.) Talking of map_frame_virt() - I take it its 2nd parameter being named "mfn" is kind of stale (pre-dating the addition of PVH support)? > @@ -84,9 +89,11 @@ void unmap_shared_info(void) > struct xen_remove_from_physmap xrtp; > > xrtp.domid = DOMID_SELF; > - xrtp.gpfn = virt_to_pfn(&shared_info); > + xrtp.gpfn = shinfo_pfn; > if ( HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrtp) != 0 ) > BUG(); > + unmap_frames(shinfo_va, 1); Better do this ahead of the hypercall? 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Mon, 28 Jul 2025 08:01:04 -0700 (PDT) Message-ID: <4bd0eb52-c00d-494a-854e-579401c183a6@suse.com> Date: Mon, 28 Jul 2025 17:01:03 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 1/2] mm: provide a way to do very early page table allocations To: Jan Beulich Cc: samuel.thibault@ens-lyon.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org References: <20250708063738.18994-1-jgross@suse.com> <20250708063738.18994-2-jgross@suse.com> <7705ed0a-7fbe-4e0e-8752-2acd0a76583e@suse.com> Content-Language: en-US From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= Autocrypt: addr=jgross@suse.com; keydata= xsBNBFOMcBYBCACgGjqjoGvbEouQZw/ToiBg9W98AlM2QHV+iNHsEs7kxWhKMjrioyspZKOB ycWxw3ie3j9uvg9EOB3aN4xiTv4qbnGiTr3oJhkB1gsb6ToJQZ8uxGq2kaV2KL9650I1SJve dYm8Of8Zd621lSmoKOwlNClALZNew72NjJLEzTalU1OdT7/i1TXkH09XSSI8mEQ/ouNcMvIJ NwQpd369y9bfIhWUiVXEK7MlRgUG6MvIj6Y3Am/BBLUVbDa4+gmzDC9ezlZkTZG2t14zWPvx XP3FAp2pkW0xqG7/377qptDmrk42GlSKN4z76ELnLxussxc7I2hx18NUcbP8+uty4bMxABEB AAHNH0p1ZXJnZW4gR3Jvc3MgPGpncm9zc0BzdXNlLmNvbT7CwHkEEwECACMFAlOMcK8CGwMH CwkIBwMCAQYVCAIJCgsEFgIDAQIeAQIXgAAKCRCw3p3WKL8TL8eZB/9G0juS/kDY9LhEXseh mE9U+iA1VsLhgDqVbsOtZ/S14LRFHczNd/Lqkn7souCSoyWsBs3/wO+OjPvxf7m+Ef+sMtr0 G5lCWEWa9wa0IXx5HRPW/ScL+e4AVUbL7rurYMfwCzco+7TfjhMEOkC+va5gzi1KrErgNRHH kg3PhlnRY0Udyqx++UYkAsN4TQuEhNN32MvN0Np3WlBJOgKcuXpIElmMM5f1BBzJSKBkW0Jc Wy3h2Wy912vHKpPV/Xv7ZwVJ27v7KcuZcErtptDevAljxJtE7aJG6WiBzm+v9EswyWxwMCIO RoVBYuiocc51872tRGywc03xaQydB+9R7BHPzsBNBFOMcBYBCADLMfoA44MwGOB9YT1V4KCy vAfd7E0BTfaAurbG+Olacciz3yd09QOmejFZC6AnoykydyvTFLAWYcSCdISMr88COmmCbJzn sHAogjexXiif6ANUUlHpjxlHCCcELmZUzomNDnEOTxZFeWMTFF9Rf2k2F0Tl4E5kmsNGgtSa aMO0rNZoOEiD/7UfPP3dfh8JCQ1VtUUsQtT1sxos8Eb/HmriJhnaTZ7Hp3jtgTVkV0ybpgFg w6WMaRkrBh17mV0z2ajjmabB7SJxcouSkR0hcpNl4oM74d2/VqoW4BxxxOD1FcNCObCELfIS auZx+XT6s+CE7Qi/c44ibBMR7hyjdzWbABEBAAHCwF8EGAECAAkFAlOMcBYCGwwACgkQsN6d 1ii/Ey9D+Af/WFr3q+bg/8v5tCknCtn92d5lyYTBNt7xgWzDZX8G6/pngzKyWfedArllp0Pn fgIXtMNV+3t8Li1Tg843EXkP7+2+CQ98MB8XvvPLYAfW8nNDV85TyVgWlldNcgdv7nn1Sq8g HwB2BHdIAkYce3hEoDQXt/mKlgEGsLpzJcnLKimtPXQQy9TxUaLBe9PInPd+Ohix0XOlY+Uk QFEx50Ki3rSDl2Zt2tnkNYKUCvTJq7jvOlaPd6d/W0tZqpyy7KVay+K4aMobDsodB3dvEAs6 ScCnh03dDAFgIq5nsB11j3KPKdVoPlfucX2c7kGNH+LUMbzqV6beIENfNexkOfxHfw== In-Reply-To: <7705ed0a-7fbe-4e0e-8752-2acd0a76583e@suse.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------XsBmjuiMEKiPTEu2kdawDqeI" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------XsBmjuiMEKiPTEu2kdawDqeI Content-Type: multipart/mixed; boundary="------------vZac5oDxUIyiXlJVoDHvZWvE"; protected-headers="v1" From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= To: Jan Beulich Cc: samuel.thibault@ens-lyon.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Message-ID: <4bd0eb52-c00d-494a-854e-579401c183a6@suse.com> Subject: Re: [MINI-OS PATCH 1/2] mm: provide a way to do very early page table allocations References: <20250708063738.18994-1-jgross@suse.com> <20250708063738.18994-2-jgross@suse.com> <7705ed0a-7fbe-4e0e-8752-2acd0a76583e@suse.com> In-Reply-To: <7705ed0a-7fbe-4e0e-8752-2acd0a76583e@suse.com> Autocrypt-Gossip: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJ3BBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AAIQkQoDSui/t3IH4WIQQ+pJkfkcoLMCa4X6CgNK6L+3cgfgn7AJ9DmMd0SMJE ePbc7/m22D2v04iu7ACffXTdZQhNl557tJuDXZSBxDmW/tLOwU0EWTecRBAIAIK5OMKMU5R2 Lk2bbjgX7vyQuCFFyKf9rC/4itNwhYWFSlKzVj3WJBDsoi2KvPm7AI+XB6NIkNAkshL5C0kd pcNd5Xo0jRR5/WE/bT7LyrJ0OJWS/qUit5eNNvsO+SxGAk28KRa1ieVLeZi9D03NL0+HIAtZ tecfqwgl3Y72UpLUyt+r7LQhcI/XR5IUUaD4C/chB4Vq2QkDKO7Q8+2HJOrFIjiVli4lU+Sf OBp64m//Y1xys++Z4ODoKh7tkh5DxiO3QBHG7bHK0CSQsJ6XUvPVYubAuy1XfSDzSeSBl//C v78Fclb+gi9GWidSTG/4hsEzd1fY5XwCZG/XJJY9M/sAAwUH/09Ar9W2U1Qm+DwZeP2ii3Ou 14Z9VlVVPhcEmR/AFykL9dw/OV2O/7cdi52+l00reUu6Nd4Dl8s4f5n8b1YFzmkVVIyhwjvU jxtPyUgDOt6DRa+RaDlXZZmxQyWcMv2anAgYWGVszeB8Myzsw8y7xhBEVV1S+1KloCzw4V8Z DSJrcsZlyMDoiTb7FyqxwQnM0f6qHxWbmOOnbzJmBqpNpFuDcz/4xNsymJylm6oXiucHQBAP Xb/cE1YNHpuaH4SRhIxwQilCYEznWowQphNAbJtEKOmcocY7EbSt8VjXTzmYENkIfkrHRyXQ dUm5AoL51XZljkCqNwrADGkTvkwsWSvCSQQYEQIACQUCWTecRAIbDAAKCRCgNK6L+3cgfuef AJ9wlZQNQUp0KwEf8Tl37RmcxCL4bQCcC5alCSMzUBJ5DBIcR4BY+CyQFAs= --------------vZac5oDxUIyiXlJVoDHvZWvE Content-Type: multipart/mixed; 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Mon, 28 Jul 2025 08:07:27 -0700 (PDT) Message-ID: Date: Mon, 28 Jul 2025 17:07:18 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 1/2] mm: provide a way to do very early page table allocations To: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= Cc: samuel.thibault@ens-lyon.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org References: <20250708063738.18994-1-jgross@suse.com> <20250708063738.18994-2-jgross@suse.com> <7705ed0a-7fbe-4e0e-8752-2acd0a76583e@suse.com> <4bd0eb52-c00d-494a-854e-579401c183a6@suse.com> Content-Language: en-US From: Jan Beulich Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: <4bd0eb52-c00d-494a-854e-579401c183a6@suse.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 28.07.2025 17:01, Jürgen Groß wrote: > On 28.07.25 16:09, Jan Beulich wrote: >> On 08.07.2025 08:37, Juergen Gross wrote: >>> @@ -664,7 +669,16 @@ static int need_pgt_func(unsigned long va, unsigned int lvl, bool is_leaf, >>> } >>> >>> pt_mfn = virt_to_mfn(pte); >>> - pt_pfn = virt_to_pfn(alloc_page()); >>> + if ( n_early_pt ) >>> + { >>> + n_early_pt--; >>> + pt_addr = (unsigned long)&early_pt[n_early_pt * PAGE_SIZE]; >>> + } >>> + else >>> + { >>> + pt_addr = alloc_page(); >>> + } >> >> The failure pattern when one fails to increase early_pt[] is likely going >> to be problematic. Wouldn't it be better to check for failure here? > > Hmm, not sure this is true. I tried the shared info mapping without adding > the special early alloc code first and finding the bug was quite easy. Feel free to ignore my comment then. 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Mon, 28 Jul 2025 08:25:07 -0700 (PDT) Message-ID: Date: Mon, 28 Jul 2025 17:25:06 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 2/2] x86: don't use a memory page for mapping the shared info page To: Jan Beulich Cc: samuel.thibault@ens-lyon.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org References: <20250708063738.18994-1-jgross@suse.com> <20250708063738.18994-3-jgross@suse.com> Content-Language: en-US From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= Autocrypt: addr=jgross@suse.com; keydata= xsBNBFOMcBYBCACgGjqjoGvbEouQZw/ToiBg9W98AlM2QHV+iNHsEs7kxWhKMjrioyspZKOB ycWxw3ie3j9uvg9EOB3aN4xiTv4qbnGiTr3oJhkB1gsb6ToJQZ8uxGq2kaV2KL9650I1SJve dYm8Of8Zd621lSmoKOwlNClALZNew72NjJLEzTalU1OdT7/i1TXkH09XSSI8mEQ/ouNcMvIJ NwQpd369y9bfIhWUiVXEK7MlRgUG6MvIj6Y3Am/BBLUVbDa4+gmzDC9ezlZkTZG2t14zWPvx XP3FAp2pkW0xqG7/377qptDmrk42GlSKN4z76ELnLxussxc7I2hx18NUcbP8+uty4bMxABEB AAHNH0p1ZXJnZW4gR3Jvc3MgPGpncm9zc0BzdXNlLmNvbT7CwHkEEwECACMFAlOMcK8CGwMH CwkIBwMCAQYVCAIJCgsEFgIDAQIeAQIXgAAKCRCw3p3WKL8TL8eZB/9G0juS/kDY9LhEXseh mE9U+iA1VsLhgDqVbsOtZ/S14LRFHczNd/Lqkn7souCSoyWsBs3/wO+OjPvxf7m+Ef+sMtr0 G5lCWEWa9wa0IXx5HRPW/ScL+e4AVUbL7rurYMfwCzco+7TfjhMEOkC+va5gzi1KrErgNRHH kg3PhlnRY0Udyqx++UYkAsN4TQuEhNN32MvN0Np3WlBJOgKcuXpIElmMM5f1BBzJSKBkW0Jc Wy3h2Wy912vHKpPV/Xv7ZwVJ27v7KcuZcErtptDevAljxJtE7aJG6WiBzm+v9EswyWxwMCIO RoVBYuiocc51872tRGywc03xaQydB+9R7BHPzsBNBFOMcBYBCADLMfoA44MwGOB9YT1V4KCy vAfd7E0BTfaAurbG+Olacciz3yd09QOmejFZC6AnoykydyvTFLAWYcSCdISMr88COmmCbJzn sHAogjexXiif6ANUUlHpjxlHCCcELmZUzomNDnEOTxZFeWMTFF9Rf2k2F0Tl4E5kmsNGgtSa aMO0rNZoOEiD/7UfPP3dfh8JCQ1VtUUsQtT1sxos8Eb/HmriJhnaTZ7Hp3jtgTVkV0ybpgFg w6WMaRkrBh17mV0z2ajjmabB7SJxcouSkR0hcpNl4oM74d2/VqoW4BxxxOD1FcNCObCELfIS auZx+XT6s+CE7Qi/c44ibBMR7hyjdzWbABEBAAHCwF8EGAECAAkFAlOMcBYCGwwACgkQsN6d 1ii/Ey9D+Af/WFr3q+bg/8v5tCknCtn92d5lyYTBNt7xgWzDZX8G6/pngzKyWfedArllp0Pn fgIXtMNV+3t8Li1Tg843EXkP7+2+CQ98MB8XvvPLYAfW8nNDV85TyVgWlldNcgdv7nn1Sq8g HwB2BHdIAkYce3hEoDQXt/mKlgEGsLpzJcnLKimtPXQQy9TxUaLBe9PInPd+Ohix0XOlY+Uk QFEx50Ki3rSDl2Zt2tnkNYKUCvTJq7jvOlaPd6d/W0tZqpyy7KVay+K4aMobDsodB3dvEAs6 ScCnh03dDAFgIq5nsB11j3KPKdVoPlfucX2c7kGNH+LUMbzqV6beIENfNexkOfxHfw== In-Reply-To: Content-Type: multipart/signed; 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name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- wsB5BAABCAAjFiEEhRJncuj2BJSl0Jf3sN6d1ii/Ey8FAmiHllIFAwAAAAAACgkQsN6d1ii/Ey+r Uwf+IocrLOAj4hS6LMNgXTBp7V0e1bj7fJ/Tz76S+LJ9PitdsScvnUkokZAbKKhlIcegSpHF5OES iQxAdLZ93LIu02svLx4DCFLeo0GDU7TRTaEEk1JGNIohbHSWK5k9XztDTe6WRQkeOPCZcw9K4XQ7 SuGoY1nVYQO2IV6xqUmJ0xaiJak+UGWsmXDEY9MM4JFQy7/iBF27Cwf7GlrZp23y0fVV6hRfl6hk BG5mRGvF0rOQj0f6fi7Fma6i3bjX8lfHfamc7ysVT2Hxg8GArOA+Ffja1V5G0S+2roABf8prI+d+ 5nMgPb/EKKXDNA/8VaHGsAHfqfQ6OdmAUENcUmZlDA== =rD2F -----END PGP SIGNATURE----- --------------BcnZvHmXBzOoMs0Ui70Oq0i2-- From minios-devel-bounces@lists.xenproject.org Tue Jul 29 08:38:38 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 29 Jul 2025 08:38:38 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1062193.1427833 (Exim 4.92) (envelope-from ) id 1ugfr2-0000m6-2E; Tue, 29 Jul 2025 08:38:36 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1062193.1427833; 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bh=x1Gw4lEIK4w6Dy0CFcEd1xYx5fwhWSSWD/vqp3z6LW0=; b=n2Vvuj+czmYUmrs1ZJnppRXgHt/T0YTjQfYjFBlkLHPKXu5ZPg+86b+SvdZs10en1I/of8 rFcfN7k4h1dCUBgrqwcjqWuipZdhi3U9KVbb/u1NoNK/HC8pZR3nr174YmusiUIhDoHTVx qq6kw7+XFntMX9sqfG9Nsnb/3per8rI= Authentication-Results: smtp-out1.suse.de; dkim=pass header.d=suse.com header.s=susede1 header.b=n2Vvuj+c DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1753778312; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=x1Gw4lEIK4w6Dy0CFcEd1xYx5fwhWSSWD/vqp3z6LW0=; b=n2Vvuj+czmYUmrs1ZJnppRXgHt/T0YTjQfYjFBlkLHPKXu5ZPg+86b+SvdZs10en1I/of8 rFcfN7k4h1dCUBgrqwcjqWuipZdhi3U9KVbb/u1NoNK/HC8pZR3nr174YmusiUIhDoHTVx qq6kw7+XFntMX9sqfG9Nsnb/3per8rI= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH v2 0/2] x86: don't use a memory page for mapping the shared info page Date: Tue, 29 Jul 2025 10:38:27 +0200 Message-ID: <20250729083829.11038-1-jgross@suse.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-3.01 / 50.00]; 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I realized that having the shared info page in the normal RAM area is a bad idea when considering kexec, as the new kernel might want it at a different location. So this series is moving the shared info page away from the RAM areas, resulting in a net win of one memory page. Changes in V2: - addressed comments by Jan Juergen Gross (2): mm: provide a way to do very early page table allocations x86: don't use a memory page for mapping the shared info page arch/x86/mm.c | 20 ++++++++++++-------- arch/x86/setup.c | 15 ++++++++------- arch/x86/x86_32.S | 7 +------ arch/x86/x86_64.S | 7 +------ hypervisor.c | 18 ++++++++++++++---- 5 files changed, 36 insertions(+), 31 deletions(-) -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 29 08:38:40 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 29 Jul 2025 08:38:40 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1062194.1427843 (Exim 4.92) (envelope-from ) id 1ugfr6-0000zb-2L; Tue, 29 Jul 2025 08:38:40 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1062194.1427843; Tue, 29 Jul 2025 08:38:40 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ugfr5-0000zU-Va; 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dkim=pass header.d=suse.com header.s=susede1 header.b="VJ/nTw/y" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1753778318; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=CLWigXSSvWCPOHny9+80GIZMDELoRcydrTbBzab8nks=; b=VJ/nTw/y8gGPwyZVPt78qGyt956qY5elh2dfL0Wk5z8YGPbL8C7qvnsTnBR69MT3qf7YSo NWbcLDrh64TsdxG+RJcxDUfsJIsMSP+B2dQplHs9HiwTPTfBjbs5FqsRnJQ9R5sV8slOmq lvuCVGwfvwyjqbA/y83/pd4vHLttA9s= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH v2 1/2] mm: provide a way to do very early page table allocations Date: Tue, 29 Jul 2025 10:38:28 +0200 Message-ID: <20250729083829.11038-2-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250729083829.11038-1-jgross@suse.com> References: <20250729083829.11038-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Level: X-Spam-Flag: NO X-Rspamd-Queue-Id: 4B54E21A28 X-Rspamd-Action: no action X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; ARC_NA(0.00)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RCVD_COUNT_TWO(0.00)[2]; MIME_TRACE(0.00)[0:+]; RCVD_VIA_SMTP_AUTH(0.00)[]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; TO_DN_SOME(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:dkim,suse.com:mid,suse.com:email]; RCVD_TLS_ALL(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; DKIM_TRACE(0.00)[suse.com:+] X-Spam-Score: -3.01 Add a small pool of statically allocated memory pages to be handed out for very early page table allocations. This will make it possible to do virtual allocations e.g. for mapping the shared info page. Signed-off-by: Juergen Gross --- V2: - add comment (Jan Beulich) - drop N_PT in favor of ARRAY_SIZE() (Jan Beulich) - use 2-dimensional array (Jan Beulich) --- arch/x86/mm.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/arch/x86/mm.c b/arch/x86/mm.c index ebc85e0d..fd808884 100644 --- a/arch/x86/mm.c +++ b/arch/x86/mm.c @@ -640,13 +640,20 @@ void change_readonly(bool readonly) /* * return a valid PTE for a given virtual address. If PTE does not exist, * allocate page-table pages. + * Provide a small pool for allocating some page tables very early. Those are + * needed currently for mapping the shared info page, so 2 pages ought to be + * enough. Add one spare page anyway. */ +static char early_pt[4][PAGE_SIZE] __attribute__((aligned(PAGE_SIZE))); +static unsigned int n_early_pt = ARRAY_SIZE(early_pt); + static int need_pgt_func(unsigned long va, unsigned int lvl, bool is_leaf, pgentry_t *pte, void *par) { pgentry_t **result = par; unsigned long pt_mfn; unsigned long pt_pfn; + unsigned long pt_addr; unsigned int idx; if ( !is_leaf ) @@ -665,7 +672,11 @@ static int need_pgt_func(unsigned long va, unsigned int lvl, bool is_leaf, } pt_mfn = virt_to_mfn(pte); - pt_pfn = virt_to_pfn(alloc_page()); + if ( n_early_pt ) + pt_addr = (unsigned long)early_pt[--n_early_pt]; + else + pt_addr = alloc_page(); + pt_pfn = virt_to_pfn(pt_addr); if ( !pt_pfn ) return -1; idx = idx_from_va_lvl(va, lvl); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 29 08:38:48 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 29 Jul 2025 08:38:48 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1062199.1427866 (Exim 4.92) (envelope-from ) id 1ugfrE-0001ca-OT; 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Tue, 29 Jul 2025 08:38:43 +0000 (UTC) Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id B1C3113876; Tue, 29 Jul 2025 08:38:43 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id OJGyKZOIiGi7PwAAD6G6ig (envelope-from ); Tue, 29 Jul 2025 08:38:43 +0000 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: 6fbf3815-6c57-11f0-a31e-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1753778324; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=CERsJmvQU3WeCwPSw287LcY2uTCpx9Nl7HfOH3U4bYg=; b=IHUwasCNPomztVQWHGFYy+mU7VEVEEHPN/0DrK64x+8S2et2VBq9CPUx3mF6C7yKW0fFGP MqdbiSd4O9wixzfN0lhYXpAXCvSdg6l2TM0WbaP+2zOBWlTuxL3FxTD381vEE7Xtd2Aezi m++EmNYqa8pDg8KkG2YAsvnO1hmH84A= Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1753778323; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=CERsJmvQU3WeCwPSw287LcY2uTCpx9Nl7HfOH3U4bYg=; b=MuaEzhDf0wVeDikVsIVfH0Yk4PmCCGgBCdyHW4nYChgQyqeMel+CqFN/2+xEwXrNwto/0G LiEclI5UTb4IXan3YbMFY2bkaNFGyE/75TeHQ4KHAfq+8XaulGIRSKsLs7gy2wMM1cSORx qmlJTW1KeuqyrU1QSmIoqitQ7j/Rn74= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH v2 2/2] x86: don't use a memory page for mapping the shared info page Date: Tue, 29 Jul 2025 10:38:29 +0200 Message-ID: <20250729083829.11038-3-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250729083829.11038-1-jgross@suse.com> References: <20250729083829.11038-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Level: X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:email,suse.com:mid]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FUZZY_RATELIMITED(0.00)[rspamd.com]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; RCPT_COUNT_THREE(0.00)[4]; RCVD_TLS_ALL(0.00)[] X-Spam-Flag: NO X-Spam-Score: -2.80 There is no need to use a populated memory page for mapping the shared info page at that location. Just use an allocated virtual address for the shared info page. For PVH allocate an unused pfn. Signed-off-by: Juergen Gross --- V2: - don't leak virtual page in map_shared_page() (Jan Beulich) --- arch/x86/mm.c | 7 ------- arch/x86/setup.c | 15 ++++++++------- arch/x86/x86_32.S | 7 +------ arch/x86/x86_64.S | 7 +------ hypervisor.c | 18 ++++++++++++++---- 5 files changed, 24 insertions(+), 30 deletions(-) diff --git a/arch/x86/mm.c b/arch/x86/mm.c index fd808884..2ffef976 100644 --- a/arch/x86/mm.c +++ b/arch/x86/mm.c @@ -498,7 +498,6 @@ static void build_pagetable(unsigned long *start_pfn, unsigned long *max_pfn) /* * Mark portion of the address space read only. */ -extern struct shared_info shared_info; struct change_readonly_par { unsigned long etext; @@ -520,12 +519,6 @@ static int change_readonly_func(unsigned long va, unsigned int lvl, if ( va + (1UL << ptdata[lvl].shift) > ro->etext ) return 1; - if ( va == (unsigned long)&shared_info ) - { - printk("skipped %lx\n", va); - return 0; - } - newval = ro->readonly ? (*pte & ~_PAGE_RW) : (*pte | _PAGE_RW); #ifdef CONFIG_PARAVIRT diff --git a/arch/x86/setup.c b/arch/x86/setup.c index 299ff8c7..8fd55c51 100644 --- a/arch/x86/setup.c +++ b/arch/x86/setup.c @@ -47,8 +47,6 @@ shared_info_t *HYPERVISOR_shared_info; */ char stack[2*STACK_SIZE]; -extern char shared_info[PAGE_SIZE]; - static inline void fpu_init(void) { asm volatile("fninit"); } @@ -76,18 +74,21 @@ static void set_info_ptr(start_info_t *ptr) #define hpc_init() +static unsigned long shared_info_va; + shared_info_t *map_shared_info(void) { int rc; - unsigned long pa = start_info_ptr->shared_info; - if ( (rc = HYPERVISOR_update_va_mapping((unsigned long)shared_info, - __pte(pa | 7), UVMF_INVLPG)) ) + if ( !shared_info_va ) + shared_info_va = alloc_virt_kernel(1); + rc = map_frame_rw(shared_info_va, PHYS_PFN(start_info_ptr->shared_info)); + if ( rc ) { printk("Failed to map shared_info!! rc=%d\n", rc); do_exit(); } - return (shared_info_t *)shared_info; + return (shared_info_t *)shared_info_va; } void unmap_shared_info(void) @@ -95,7 +96,7 @@ void unmap_shared_info(void) int rc; pte_t nullpte = { }; - if ( (rc = HYPERVISOR_update_va_mapping((unsigned long)shared_info, + if ( (rc = HYPERVISOR_update_va_mapping(shared_info_va, nullpte, UVMF_INVLPG)) ) { printk("Failed to unmap shared_info page!! rc=%d\n", rc); diff --git a/arch/x86/x86_32.S b/arch/x86/x86_32.S index 3de00277..5d891164 100644 --- a/arch/x86/x86_32.S +++ b/arch/x86/x86_32.S @@ -36,13 +36,8 @@ _start: stack_start: .long stack+(2*__STACK_SIZE), __KERNEL_SS -.globl shared_info, hypercall_page - /* Unpleasant -- the PTE that maps this page is actually overwritten */ - /* to map the real shared-info page! :-) */ .align __PAGE_SIZE -shared_info: - .fill __PAGE_SIZE,1,0 - +.globl hypercall_page hypercall_page: .fill __PAGE_SIZE,1,0 diff --git a/arch/x86/x86_64.S b/arch/x86/x86_64.S index 7529c02e..09b93e39 100644 --- a/arch/x86/x86_64.S +++ b/arch/x86/x86_64.S @@ -33,13 +33,8 @@ _start: stack_start: .quad stack+(2*__STACK_SIZE) -.globl shared_info, hypercall_page - /* Unpleasant -- the PTE that maps this page is actually overwritten */ - /* to map the real shared-info page! :-) */ .align __PAGE_SIZE -shared_info: - .fill __PAGE_SIZE,1,0 - +.globl hypercall_page hypercall_page: .fill __PAGE_SIZE,1,0 diff --git a/hypervisor.c b/hypervisor.c index 6476d658..213eb49d 100644 --- a/hypervisor.c +++ b/hypervisor.c @@ -27,8 +27,10 @@ #include #include +#include #include #include +#include #include EXPORT_SYMBOL(hypercall_page); @@ -37,7 +39,8 @@ EXPORT_SYMBOL(hypercall_page); ((sh)->evtchn_pending[idx] & ~(sh)->evtchn_mask[idx]) #ifndef CONFIG_PARAVIRT -extern shared_info_t shared_info; +static unsigned long shinfo_pfn; +static unsigned long shinfo_va; int hvm_get_parameter(int idx, uint64_t *value) { @@ -69,24 +72,31 @@ shared_info_t *map_shared_info(void) { struct xen_add_to_physmap xatp; + shinfo_pfn = e820_get_reserved_pfns(1); xatp.domid = DOMID_SELF; xatp.idx = 0; xatp.space = XENMAPSPACE_shared_info; - xatp.gpfn = virt_to_pfn(&shared_info); + xatp.gpfn = shinfo_pfn; if ( HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp) != 0 ) BUG(); + if ( !shinfo_va ) + shinfo_va = alloc_virt_kernel(1); + if ( !shinfo_va || map_frame_rw(shinfo_va, shinfo_pfn) ) + BUG(); - return &shared_info; + return (shared_info_t *)shinfo_va; } void unmap_shared_info(void) { struct xen_remove_from_physmap xrtp; + unmap_frames(shinfo_va, 1); xrtp.domid = DOMID_SELF; - xrtp.gpfn = virt_to_pfn(&shared_info); + xrtp.gpfn = shinfo_pfn; if ( HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrtp) != 0 ) BUG(); + e820_put_reserved_pfns(shinfo_pfn, 1); } #endif -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Tue Jul 29 08:55:51 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 29 Jul 2025 08:55:51 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1062273.1427931 (Exim 4.92) (envelope-from ) id 1ugg7g-0000Rr-Ep; Tue, 29 Jul 2025 08:55:48 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1062273.1427931; Tue, 29 Jul 2025 08:55:48 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ugg7g-0000Rk-By; Tue, 29 Jul 2025 08:55:48 +0000 Received: by outflank-mailman (input) for mailman id 1062273; Tue, 29 Jul 2025 08:55:46 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1ugg7e-0000RY-Qe for minios-devel@lists.xenproject.org; Tue, 29 Jul 2025 08:55:46 +0000 Received: from mail-ed1-x52b.google.com (mail-ed1-x52b.google.com [2a00:1450:4864:20::52b]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id d07b6e03-6c59-11f0-a31e-13f23c93f187; Tue, 29 Jul 2025 10:55:45 +0200 (CEST) Received: by mail-ed1-x52b.google.com with SMTP id 4fb4d7f45d1cf-60c4521ae2cso9457455a12.0 for ; Tue, 29 Jul 2025 01:55:45 -0700 (PDT) Received: from ?IPV6:2003:e5:872d:3c00:27e3:fc0:fb5:67a3? 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Tue, 29 Jul 2025 01:55:45 -0700 (PDT) Message-ID: Date: Tue, 29 Jul 2025 10:55:43 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH v2 1/2] mm: provide a way to do very early page table allocations To: Jan Beulich Cc: samuel.thibault@ens-lyon.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org References: <20250729083829.11038-1-jgross@suse.com> <20250729083829.11038-2-jgross@suse.com> <2fb97c32-f0e7-4d9f-bf3c-5fd621498b29@suse.com> Content-Language: en-US From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= Autocrypt: addr=jgross@suse.com; keydata= xsBNBFOMcBYBCACgGjqjoGvbEouQZw/ToiBg9W98AlM2QHV+iNHsEs7kxWhKMjrioyspZKOB ycWxw3ie3j9uvg9EOB3aN4xiTv4qbnGiTr3oJhkB1gsb6ToJQZ8uxGq2kaV2KL9650I1SJve dYm8Of8Zd621lSmoKOwlNClALZNew72NjJLEzTalU1OdT7/i1TXkH09XSSI8mEQ/ouNcMvIJ NwQpd369y9bfIhWUiVXEK7MlRgUG6MvIj6Y3Am/BBLUVbDa4+gmzDC9ezlZkTZG2t14zWPvx XP3FAp2pkW0xqG7/377qptDmrk42GlSKN4z76ELnLxussxc7I2hx18NUcbP8+uty4bMxABEB AAHNH0p1ZXJnZW4gR3Jvc3MgPGpncm9zc0BzdXNlLmNvbT7CwHkEEwECACMFAlOMcK8CGwMH CwkIBwMCAQYVCAIJCgsEFgIDAQIeAQIXgAAKCRCw3p3WKL8TL8eZB/9G0juS/kDY9LhEXseh mE9U+iA1VsLhgDqVbsOtZ/S14LRFHczNd/Lqkn7souCSoyWsBs3/wO+OjPvxf7m+Ef+sMtr0 G5lCWEWa9wa0IXx5HRPW/ScL+e4AVUbL7rurYMfwCzco+7TfjhMEOkC+va5gzi1KrErgNRHH kg3PhlnRY0Udyqx++UYkAsN4TQuEhNN32MvN0Np3WlBJOgKcuXpIElmMM5f1BBzJSKBkW0Jc Wy3h2Wy912vHKpPV/Xv7ZwVJ27v7KcuZcErtptDevAljxJtE7aJG6WiBzm+v9EswyWxwMCIO RoVBYuiocc51872tRGywc03xaQydB+9R7BHPzsBNBFOMcBYBCADLMfoA44MwGOB9YT1V4KCy vAfd7E0BTfaAurbG+Olacciz3yd09QOmejFZC6AnoykydyvTFLAWYcSCdISMr88COmmCbJzn sHAogjexXiif6ANUUlHpjxlHCCcELmZUzomNDnEOTxZFeWMTFF9Rf2k2F0Tl4E5kmsNGgtSa aMO0rNZoOEiD/7UfPP3dfh8JCQ1VtUUsQtT1sxos8Eb/HmriJhnaTZ7Hp3jtgTVkV0ybpgFg w6WMaRkrBh17mV0z2ajjmabB7SJxcouSkR0hcpNl4oM74d2/VqoW4BxxxOD1FcNCObCELfIS auZx+XT6s+CE7Qi/c44ibBMR7hyjdzWbABEBAAHCwF8EGAECAAkFAlOMcBYCGwwACgkQsN6d 1ii/Ey9D+Af/WFr3q+bg/8v5tCknCtn92d5lyYTBNt7xgWzDZX8G6/pngzKyWfedArllp0Pn fgIXtMNV+3t8Li1Tg843EXkP7+2+CQ98MB8XvvPLYAfW8nNDV85TyVgWlldNcgdv7nn1Sq8g HwB2BHdIAkYce3hEoDQXt/mKlgEGsLpzJcnLKimtPXQQy9TxUaLBe9PInPd+Ohix0XOlY+Uk QFEx50Ki3rSDl2Zt2tnkNYKUCvTJq7jvOlaPd6d/W0tZqpyy7KVay+K4aMobDsodB3dvEAs6 ScCnh03dDAFgIq5nsB11j3KPKdVoPlfucX2c7kGNH+LUMbzqV6beIENfNexkOfxHfw== In-Reply-To: <2fb97c32-f0e7-4d9f-bf3c-5fd621498b29@suse.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------fz79nls2L8PcHdp4XbM256ZS" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------fz79nls2L8PcHdp4XbM256ZS Content-Type: multipart/mixed; boundary="------------E5mKh97YDGX1ahT5Es4huWC9"; protected-headers="v1" From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= To: Jan Beulich Cc: samuel.thibault@ens-lyon.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Message-ID: Subject: Re: [MINI-OS PATCH v2 1/2] mm: provide a way to do very early page table allocations References: <20250729083829.11038-1-jgross@suse.com> <20250729083829.11038-2-jgross@suse.com> <2fb97c32-f0e7-4d9f-bf3c-5fd621498b29@suse.com> In-Reply-To: <2fb97c32-f0e7-4d9f-bf3c-5fd621498b29@suse.com> Autocrypt-Gossip: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJ3BBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AAIQkQoDSui/t3IH4WIQQ+pJkfkcoLMCa4X6CgNK6L+3cgfgn7AJ9DmMd0SMJE ePbc7/m22D2v04iu7ACffXTdZQhNl557tJuDXZSBxDmW/tLOwU0EWTecRBAIAIK5OMKMU5R2 Lk2bbjgX7vyQuCFFyKf9rC/4itNwhYWFSlKzVj3WJBDsoi2KvPm7AI+XB6NIkNAkshL5C0kd pcNd5Xo0jRR5/WE/bT7LyrJ0OJWS/qUit5eNNvsO+SxGAk28KRa1ieVLeZi9D03NL0+HIAtZ tecfqwgl3Y72UpLUyt+r7LQhcI/XR5IUUaD4C/chB4Vq2QkDKO7Q8+2HJOrFIjiVli4lU+Sf OBp64m//Y1xys++Z4ODoKh7tkh5DxiO3QBHG7bHK0CSQsJ6XUvPVYubAuy1XfSDzSeSBl//C v78Fclb+gi9GWidSTG/4hsEzd1fY5XwCZG/XJJY9M/sAAwUH/09Ar9W2U1Qm+DwZeP2ii3Ou 14Z9VlVVPhcEmR/AFykL9dw/OV2O/7cdi52+l00reUu6Nd4Dl8s4f5n8b1YFzmkVVIyhwjvU jxtPyUgDOt6DRa+RaDlXZZmxQyWcMv2anAgYWGVszeB8Myzsw8y7xhBEVV1S+1KloCzw4V8Z DSJrcsZlyMDoiTb7FyqxwQnM0f6qHxWbmOOnbzJmBqpNpFuDcz/4xNsymJylm6oXiucHQBAP Xb/cE1YNHpuaH4SRhIxwQilCYEznWowQphNAbJtEKOmcocY7EbSt8VjXTzmYENkIfkrHRyXQ dUm5AoL51XZljkCqNwrADGkTvkwsWSvCSQQYEQIACQUCWTecRAIbDAAKCRCgNK6L+3cgfuef AJ9wlZQNQUp0KwEf8Tl37RmcxCL4bQCcC5alCSMzUBJ5DBIcR4BY+CyQFAs= --------------E5mKh97YDGX1ahT5Es4huWC9 Content-Type: multipart/mixed; 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Tue, 29 Jul 2025 02:00:18 -0700 (PDT) Message-ID: <0b6b3a4a-03df-4bc9-996d-ba2efb3f5b73@suse.com> Date: Tue, 29 Jul 2025 11:00:10 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH v2 2/2] x86: don't use a memory page for mapping the shared info page To: Juergen Gross Cc: samuel.thibault@ens-lyon.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org References: <20250729083829.11038-1-jgross@suse.com> <20250729083829.11038-3-jgross@suse.com> Content-Language: en-US From: Jan Beulich Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: <20250729083829.11038-3-jgross@suse.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 29.07.2025 10:38, Juergen Gross wrote: > --- a/arch/x86/x86_64.S > +++ b/arch/x86/x86_64.S > @@ -33,13 +33,8 @@ _start: > stack_start: > .quad stack+(2*__STACK_SIZE) > > -.globl shared_info, hypercall_page > - /* Unpleasant -- the PTE that maps this page is actually overwritten */ > - /* to map the real shared-info page! :-) */ > .align __PAGE_SIZE > -shared_info: > - .fill __PAGE_SIZE,1,0 > - > +.globl hypercall_page While touching this line, may I suggest to indent this directive to match all other directives in context? Even if assemblers accept them for most targets, directives starting in the first column strictly speaking are misplaced. > --- a/hypervisor.c > +++ b/hypervisor.c > @@ -27,8 +27,10 @@ > > #include > #include > +#include > #include > #include > +#include > #include > > EXPORT_SYMBOL(hypercall_page); > @@ -37,7 +39,8 @@ EXPORT_SYMBOL(hypercall_page); > ((sh)->evtchn_pending[idx] & ~(sh)->evtchn_mask[idx]) > > #ifndef CONFIG_PARAVIRT > -extern shared_info_t shared_info; > +static unsigned long shinfo_pfn; > +static unsigned long shinfo_va; > > int hvm_get_parameter(int idx, uint64_t *value) > { > @@ -69,24 +72,31 @@ shared_info_t *map_shared_info(void) > { > struct xen_add_to_physmap xatp; > > + shinfo_pfn = e820_get_reserved_pfns(1); > xatp.domid = DOMID_SELF; > xatp.idx = 0; > xatp.space = XENMAPSPACE_shared_info; > - xatp.gpfn = virt_to_pfn(&shared_info); > + xatp.gpfn = shinfo_pfn; > if ( HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp) != 0 ) > BUG(); > + if ( !shinfo_va ) > + shinfo_va = alloc_virt_kernel(1); > + if ( !shinfo_va || map_frame_rw(shinfo_va, shinfo_pfn) ) > + BUG(); Now there's a new asymmetry: Here you check whether alloc_virt_kernel() (appears to have) failed, whereas in the PV variant you don't. And it's really only "appears to", as the function won't return 0 in the failure case, afaics. I therefore think that extra condition simply wants dropping here. Then Reviewed-by: Jan Beulich As for the other patch, happy to make both adjustments while committing. As long as you agree, of course. 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Tue, 29 Jul 2025 01:53:01 -0700 (PDT) Message-ID: <2fb97c32-f0e7-4d9f-bf3c-5fd621498b29@suse.com> Date: Tue, 29 Jul 2025 10:52:54 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH v2 1/2] mm: provide a way to do very early page table allocations To: Juergen Gross Cc: samuel.thibault@ens-lyon.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org References: <20250729083829.11038-1-jgross@suse.com> <20250729083829.11038-2-jgross@suse.com> Content-Language: en-US From: Jan Beulich Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: <20250729083829.11038-2-jgross@suse.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 29.07.2025 10:38, Juergen Gross wrote: > --- a/arch/x86/mm.c > +++ b/arch/x86/mm.c > @@ -640,13 +640,20 @@ void change_readonly(bool readonly) > /* > * return a valid PTE for a given virtual address. If PTE does not exist, > * allocate page-table pages. > + * Provide a small pool for allocating some page tables very early. Those are > + * needed currently for mapping the shared info page, so 2 pages ought to be > + * enough. Add one spare page anyway. > */ Hmm, 2 pages plus one spare doesn't yield ... > +static char early_pt[4][PAGE_SIZE] __attribute__((aligned(PAGE_SIZE))); ... 4. Was 2 a typo, and 3 was meant? (Which, just to mention it, then isn't correct for 32-bit aiui.) Whatever adjustment wants making - happy to do so while committing. Just need to know which way. 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micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------5hVzY4zwqa1BDsb9fT7QS2vA" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------5hVzY4zwqa1BDsb9fT7QS2vA Content-Type: multipart/mixed; boundary="------------a0m4HCodCA6CHkA3RG7CDH7k"; protected-headers="v1" From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= To: Jan Beulich Cc: samuel.thibault@ens-lyon.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Message-ID: <8d4ca224-dbed-4548-b26b-0e8b020c377f@suse.com> Subject: Re: [MINI-OS PATCH v2 2/2] x86: don't use a memory page for mapping the shared info page References: <20250729083829.11038-1-jgross@suse.com> <20250729083829.11038-3-jgross@suse.com> <0b6b3a4a-03df-4bc9-996d-ba2efb3f5b73@suse.com> In-Reply-To: <0b6b3a4a-03df-4bc9-996d-ba2efb3f5b73@suse.com> Autocrypt-Gossip: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJ3BBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AAIQkQoDSui/t3IH4WIQQ+pJkfkcoLMCa4X6CgNK6L+3cgfgn7AJ9DmMd0SMJE ePbc7/m22D2v04iu7ACffXTdZQhNl557tJuDXZSBxDmW/tLOwU0EWTecRBAIAIK5OMKMU5R2 Lk2bbjgX7vyQuCFFyKf9rC/4itNwhYWFSlKzVj3WJBDsoi2KvPm7AI+XB6NIkNAkshL5C0kd pcNd5Xo0jRR5/WE/bT7LyrJ0OJWS/qUit5eNNvsO+SxGAk28KRa1ieVLeZi9D03NL0+HIAtZ tecfqwgl3Y72UpLUyt+r7LQhcI/XR5IUUaD4C/chB4Vq2QkDKO7Q8+2HJOrFIjiVli4lU+Sf OBp64m//Y1xys++Z4ODoKh7tkh5DxiO3QBHG7bHK0CSQsJ6XUvPVYubAuy1XfSDzSeSBl//C v78Fclb+gi9GWidSTG/4hsEzd1fY5XwCZG/XJJY9M/sAAwUH/09Ar9W2U1Qm+DwZeP2ii3Ou 14Z9VlVVPhcEmR/AFykL9dw/OV2O/7cdi52+l00reUu6Nd4Dl8s4f5n8b1YFzmkVVIyhwjvU jxtPyUgDOt6DRa+RaDlXZZmxQyWcMv2anAgYWGVszeB8Myzsw8y7xhBEVV1S+1KloCzw4V8Z DSJrcsZlyMDoiTb7FyqxwQnM0f6qHxWbmOOnbzJmBqpNpFuDcz/4xNsymJylm6oXiucHQBAP Xb/cE1YNHpuaH4SRhIxwQilCYEznWowQphNAbJtEKOmcocY7EbSt8VjXTzmYENkIfkrHRyXQ dUm5AoL51XZljkCqNwrADGkTvkwsWSvCSQQYEQIACQUCWTecRAIbDAAKCRCgNK6L+3cgfuef AJ9wlZQNQUp0KwEf8Tl37RmcxCL4bQCcC5alCSMzUBJ5DBIcR4BY+CyQFAs= --------------a0m4HCodCA6CHkA3RG7CDH7k Content-Type: multipart/mixed; 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