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boundary="------------QS4ufNLs9K48IgXsi2pjyv9v"; protected-headers="v1" From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org, samuel.thibault@ens-lyon.org Message-ID: <759aabab-a5d6-4fdf-b19a-65ad5363340d@suse.com> Subject: Re: [MINI-OS PATCH 00/12] kexec: add kexec support to Mini-OS References: <20250321092451.17309-1-jgross@suse.com> <25fce343-d18c-46b5-ac68-5ba4c1335df9@suse.com> In-Reply-To: <25fce343-d18c-46b5-ac68-5ba4c1335df9@suse.com> --------------QS4ufNLs9K48IgXsi2pjyv9v Content-Type: multipart/mixed; boundary="------------8pEQatbnGK9eKvU6H820dX8Y" --------------8pEQatbnGK9eKvU6H820dX8Y Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: base64 T24gMDcuMDUuMjUgMTQ6NTgsIEp1ZXJnZW4gR3Jvc3Mgd3JvdGU6DQo+IFBpbmc/DQoNCkkn ZCByZWFsbHkgYXBwcmVjaWF0ZSBzb21lIGZlZWRiYWNrLg0KDQoNCkp1ZXJnZW4NCg0KPiAN Cj4gT24gMjEuMDMuMjUgMTA6MjQsIEp1ZXJnZW4gR3Jvc3Mgd3JvdGU6DQo+PiBBZGQgYmFz aWMga2V4ZWMgc3VwcG9ydCB0byBNaW5pLU9TIGZvciBydW5uaW5nIGluIHg4NiBQVkggbW9k ZS4NCj4+DQo+PiBXaXRoIHRoaXMgc2VyaWVzIGFwcGxpZWQgaXQgaXMgcG9zc2libGUgdG8g YWN0aXZhdGUgYW5vdGhlciBrZXJuZWwNCj4+IGZyb20gd2l0aGluIE1pbmktT1MuDQo+Pg0K Pj4gUmlnaHQgbm93IG5vIFhlbiByZWxhdGVkIHRlYXJkb3duIGlzIGRvbmUgKHNvIG5vIHJl c2V0IG9mIGdyYW50IHRhYmxlLA0KPj4gZXZlbnQgY2hhbm5lbHMsIFBWIGRldmljZXMpLiBU aGVzZSBzaG91bGQgYmUgYWRkZWQgdmlhIGtleGVjIGNhbGxiYWNrcw0KPj4gd2hpY2ggYXJl IGFkZGVkIGFzIGEgZnJhbWV3b3JrLg0KPj4NCj4+IFRoaXMgaXMgYSBtYWpvciBidWlsZGlu ZyBibG9jayBmb3Igc3VwcG9ydCBvZiBYZW5zdG9yZS1zdHViZG9tIGxpdmUNCj4+IHVwZGF0 ZSAoaW4gZmFjdCBJJ3ZlIHRlc3RlZCB0aGUga2V4ZWMgcGF0aCB0byB3b3JrIHVzaW5nIHRo ZSBQVkgNCj4+IHZhcmlhbnQgb2YgWGVuc3RvcmUtc3R1YmRvbSkuDQo+Pg0KPj4gSnVlcmdl biBHcm9zcyAoMTIpOg0KPj4gwqDCoCBhZGQga2V4ZWMgZnJhbWV3b3JrDQo+PiDCoMKgIE1p bmktT1M6IGFkZCBmaW5hbCBrZXhlYyBzdGFnZQ0KPj4gwqDCoCBtaW5pLW9zOiBhZGQgZWxm LmgNCj4+IMKgwqAgbWluaS1vczogYW5hbHl6ZSBuZXcga2VybmVsIGZvciBrZXhlYw0KPj4g wqDCoCBtaW5pLW9zOiBrZXhlYzogZmluYWxpemUgcGFyYW1ldGVyIGxvY2F0aW9uIGFuZCBz aXplDQo+PiDCoMKgIG1pbmktb3M6IHJlc2VydmUgbWVtb3J5IGJlbG93IGJvdW5kYXJ5DQo+ PiDCoMKgIG1pbmktb3M6IGtleGVjOiBidWlsZCBwYXJhbWV0ZXJzIGZvciBuZXcga2VybmVs DQo+PiDCoMKgIG1pbmktb3M6IGtleGVjOiBtb3ZlIHVzZWQgcGFnZXMgYXdheSBmb3IgbmV3 IGtlcm5lbA0KPj4gwqDCoCBNaW5pLU9TOiBtbTogY2hhbmdlIHNldF9yZWFkb25seSgpIHRv IGNoYW5nZV9yZWFkb25seSgpDQo+PiDCoMKgIE1pbmktT1M6IGtleGVjOiBzd2l0Y2ggcmVh ZC1vbmx5IGFyZWEgdG8gYmUgd3JpdGFibGUgYWdhaW4NCj4+IMKgwqAgbWluaS1vczoga2V4 ZWM6IGFkZCBrZXhlYyBjYWxsYmFjayBmdW5jdGlvbmFsaXR5DQo+PiDCoMKgIG1pbmktb3M6 IGtleGVjOiBkbyB0aGUgZmluYWwga2V4ZWMgc3RlcA0KPj4NCj4+IMKgIENvbmZpZy5ta8Kg wqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqAgfMKgwqAgMSArDQo+PiDCoCBNYWtl ZmlsZcKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoCB8wqDCoCAxICsNCj4+ IMKgIGFyY2gveDg2L2tleGVjLmPCoMKgwqDCoMKgwqDCoMKgwqDCoCB8IDI3MyArKysrKysr KysrKysrKysrKysrKysrKysrKysrKw0KPj4gwqAgYXJjaC94ODYvbWluaW9zLXg4Ni5sZHMu U8KgIHzCoCAxNiArKw0KPj4gwqAgYXJjaC94ODYvbW0uY8KgwqDCoMKgwqDCoMKgwqDCoMKg wqDCoMKgIHwgMjM4ICsrKysrKysrKysrKysrKysrKysrLS0tLS0tDQo+PiDCoCBhcmNoL3g4 Ni90ZXN0YnVpbGQvYWxsLW5vwqAgfMKgwqAgMSArDQo+PiDCoCBhcmNoL3g4Ni90ZXN0YnVp bGQvYWxsLXllcyB8wqDCoCAyICsNCj4+IMKgIGFyY2gveDg2L3Rlc3RidWlsZC9rZXhlY8Kg wqAgfMKgwqAgNCArDQo+PiDCoCBhcmNoL3g4Ni94ODZfaHZtLlPCoMKgwqDCoMKgwqDCoMKg IHzCoCA0NiArKysrKw0KPj4gwqAgaW5jbHVkZS9lbGYuaMKgwqDCoMKgwqDCoMKgwqDCoMKg wqDCoMKgIHwgMzQwICsrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysNCj4+ IMKgIGluY2x1ZGUva2V4ZWMuaMKgwqDCoMKgwqDCoMKgwqDCoMKgwqAgfMKgIDYzICsrKysr KysNCj4+IMKgIGluY2x1ZGUvbW0uaMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqAgfMKg wqAgOCArDQo+PiDCoCBpbmNsdWRlL3g4Ni9vcy5owqDCoMKgwqDCoMKgwqDCoMKgwqAgfMKg wqAgNSArDQo+PiDCoCBrZXhlYy5jwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDC oMKgwqAgfCAyNTMgKysrKysrKysrKysrKysrKysrKysrKysrKysrDQo+PiDCoCBtbS5jwqDC oMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqAgfMKgIDg5ICsrKysr KysrKy0NCj4+IMKgIDE1IGZpbGVzIGNoYW5nZWQsIDEyODkgaW5zZXJ0aW9ucygrKSwgNTEg ZGVsZXRpb25zKC0pDQo+PiDCoCBjcmVhdGUgbW9kZSAxMDA2NDQgYXJjaC94ODYva2V4ZWMu Yw0KPj4gwqAgY3JlYXRlIG1vZGUgMTAwNjQ0IGFyY2gveDg2L3Rlc3RidWlsZC9rZXhlYw0K Pj4gwqAgY3JlYXRlIG1vZGUgMTAwNjQ0IGluY2x1ZGUvZWxmLmgNCj4+IMKgIGNyZWF0ZSBt b2RlIDEwMDY0NCBpbmNsdWRlL2tleGVjLmgNCj4+IMKgIGNyZWF0ZSBtb2RlIDEwMDY0NCBr ZXhlYy5jDQo+Pg0KPiANCg0K --------------8pEQatbnGK9eKvU6H820dX8Y Content-Type: application/pgp-keys; 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charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, Mar 21, 2025 at 5:25=E2=80=AFAM Juergen Gross wro= te: > > Add a new config option CONFIG_KEXEC for support of kexec-ing into a > new mini-os kernel. Add a related kexec.c source and a kexec.h header. > > For now allow CONFIG_KEXEC to be set only for PVH variant of mini-os. > > Signed-off-by: Juergen Gross > --- > diff --git a/arch/x86/testbuild/all-yes b/arch/x86/testbuild/all-yes > index 8ae489a4..99ba75dd 100644 > --- a/arch/x86/testbuild/all-yes > +++ b/arch/x86/testbuild/all-yes > @@ -19,3 +19,5 @@ CONFIG_BALLOON =3D y > CONFIG_USE_XEN_CONSOLE =3D y > # The following are special: they need support from outside > CONFIG_LWIP =3D n > +# KEXEC only without PARAVIRT Maybe: "KEXEC not implemented for PARAVIRT"? > +CONFIG_KEXEC =3D n > diff --git a/kexec.c b/kexec.c > new file mode 100644 > index 00000000..53528169 > --- /dev/null > +++ b/kexec.c > @@ -0,0 +1,62 @@ > + > +#include > +#include > +#include > +#include > + > +/* > + * General approach for kexec support (PVH only) is as follows: > + * > + * - New kernel needs to be in memory in form of a ELF file in a virtual "in the form of an ELF binary" > + * memory region. Maybe just "The new kernel needs to be an ELF binary loaded into the Mini-OS address space"? > + * - A new start_info structure is constructed in memory with the final > + * memory locations included. > + * - All memory areas needed for kexec execution are being finalized. > + * - From here on a graceful failure is no longer possible. > + * - Grants and event channels are torn down. > + * - A temporary set of page tables is constructed at a location where i= t > + * doesn't conflict with old and new kernel or start_info. > + * - The final kexec execution stage is copied to a memory area below 4G= which > + * doesn't conflict with the target areas of kernel etc. > + * - Cr3 is switched to the new set of page tables. > + * - Execution continues in the final execution stage. > + * - All data is copied to its final addresses. > + * - Processing is switched to 32-bit mode without address translation. Maybe "CPU is switched to 32-bit mode with paging disabled."? Is the following memory layout correct? [ 0 ... 8MB ] ... [ X ... X + Y ] ... [ Z ... ] Old stubdom New stubdom kexec code kexec code copies New stubdom to 0 and later jumps to New stubdom @ 0 The temporary page tables are to allow old stubdom and kexec code to be called while overwriting the "Old stubdom" range which would include the page tables originally used? Or it can only run the kexec code once old stubdom is overwritten, right? I think some comments tweaks would be helpful, but code-wise everything is okay, so: Reviewed-by: Jason Andryuk Regards, Jason From minios-devel-bounces@lists.xenproject.org Sat Jun 14 16:41:00 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Sat, 14 Jun 2025 16:41:00 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1015624.1393179 (Exim 4.92) (envelope-from ) id 1uQTwC-0001SR-HU; Sat, 14 Jun 2025 16:41:00 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1015624.1393179; Sat, 14 Jun 2025 16:41:00 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uQTwC-0001SK-EP; Sat, 14 Jun 2025 16:41:00 +0000 Received: by outflank-mailman (input) for mailman id 1015624; Sat, 14 Jun 2025 16:40:58 +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 1uQTwA-0001Aq-Qp for minios-devel@lists.xenproject.org; Sat, 14 Jun 2025 16:40:58 +0000 Received: from mail-yw1-x112a.google.com (mail-yw1-x112a.google.com [2607:f8b0:4864:20::112a]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 58de0f23-493e-11f0-a309-13f23c93f187; Sat, 14 Jun 2025 18:40:58 +0200 (CEST) Received: by mail-yw1-x112a.google.com with SMTP id 00721157ae682-70e1d8c2dc2so27363927b3.3; Sat, 14 Jun 2025 09:40:58 -0700 (PDT) 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: 58de0f23-493e-11f0-a309-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1749919257; x=1750524057; darn=lists.xenproject.org; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=42HLB7vPizxYysP77djk2L92Us5rCaaCpZzTdci5z24=; b=VWBFS513kb+RXIUJ8nKATywnf8hARg3JOPWBOGUNnJLyoq4ouwjaRhkS0FevoegrSN 5/USROQh/lnqTlxXWSK8EE4IEEkSUMu+JTwdP370O+K4JB8wrYgvVGXT83imZzOeJPZv GV7BPSA1vSOI+nZE2vr5EjNIOwlXY3lPlbJoqVpUNkYxW56tdZo6i2MVD483s63T0CN0 XEY4/wzsqfKauzc2634ceJc3okYMiE3Kbhi+Z2jAOagUzA+cGHsHbzm5TDidZiqJkEt6 vba7GQHDHkFOpHzp2R0MqOQtlpeDcTk5Lse4GV1WdJDLtxUbnR+JluMU2Wuuno2MdFxD hPgw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1749919257; x=1750524057; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=42HLB7vPizxYysP77djk2L92Us5rCaaCpZzTdci5z24=; b=deVwUzAEm5szzxY+C8p2NHsZO7pbVdSIn/AjrrFsGySZdqTlosu0948ux64L7Ded8G 3ngDb+Zyk5zkgRG6Ax2/1JQt95qPNfy7T6Sm0M7BMU+YY3924u1Ptx4bX77h8M/VOubB 7a9CnOjTCxb74Y5AWOpu+QmYi9jFn98pqEGSkOI3SvceGhPGCqSQ2I0JdExjkG/tQ9TU urGF26L+NXklR6MRk32QogtTgpQMDO2PLTZXyGP2skg/OgJpTcsrSCGuM9GXxVvOJa1B 2OuXPqELiLoY6CMYkI0cNjBcPMS1H14MDTLLM3QCU7GYbFQH2u5nW0GrFXF/bf/S7Cwi RUsQ== X-Forwarded-Encrypted: i=1; AJvYcCXq+8jOAAfRE2MebBVemc/yqqOTCrZ+EI8JofBQ8izD6ZgMFvfYxCC+Dp5DH/nX3vCL9yPrbDYK5Uo=@lists.xenproject.org X-Gm-Message-State: AOJu0YzPaamEBnODfuSX3I1h2NqEhQMXtgQiBw2XXjJNfVvQnfN3oLwx lJYvVSCEMdB+KxpchCJ5c9pdL+Q6yJlVGUNGtpnwNrCunWpp1Hne8+cpq7PhmXlWOpcyDDpbgyt xU81b0DEmyM6Mosx8poAl7uzry0JK+nA= X-Gm-Gg: ASbGncu2Cx72u4zqbDXAe1ThL58BxpBvEwQJTSIqi4ba9aha4BonF0e1V2yNrzVMS7K M/6xEV56r5u6Eu7TOf+sk4FZQGrOUt1J9riyqRsA2GO++2XZlx+2FU6gtvnw1nwF3/Odp3PjSz2 XNtQODP4xBXPxPMWWzoRwp4JzT7GX3Wxrct555IDCp X-Google-Smtp-Source: AGHT+IGuuuPtD15+NIRs6pZG7pwSHOZbi5aqJoqJZZcGKqtWPCnsTvgV8mnXjUxGwLV7BMyrLSyX2ybHgpVzB0Jwedc= X-Received: by 2002:a05:690c:4c08:b0:70f:8883:eb1a with SMTP id 00721157ae682-7117537b9b5mr54186967b3.6.1749919257058; Sat, 14 Jun 2025 09:40:57 -0700 (PDT) MIME-Version: 1.0 References: <20250321092451.17309-1-jgross@suse.com> <20250321092451.17309-3-jgross@suse.com> In-Reply-To: <20250321092451.17309-3-jgross@suse.com> From: Jason Andryuk Date: Sat, 14 Jun 2025 12:40:46 -0400 X-Gm-Features: AX0GCFsY6c5o-q74wdQQKXJzn2F1w802AGfeuuQ3aB3gDR_WQuh4t3gmQe3EW3k Message-ID: Subject: Re: [MINI-OS PATCH 02/12] kexec: add final kexec stage To: Juergen Gross Cc: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org, samuel.thibault@ens-lyon.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, Mar 21, 2025 at 5:25=E2=80=AFAM Juergen Gross wro= te: > > Add the code and data definitions of the final kexec stage. > > Put the code and related data into a dedicated section in order to be > able to copy it to another location. For this reason there must be no > absolute relocations being used in the code or data. > > Being functionally related, add a function for adding a final kexec > action. > > Signed-off-by: Juergen Gross > --- /dev/null > +++ b/arch/x86/kexec.c > @@ -0,0 +1,109 @@ > + > +/* > + * Final stage of kexec. Copies all data to the final destinations, zero= es > + * .bss and activates new kernel. > + * Must be called with interrupts off. Stack, code and data must be > + * accessible via identity mapped virtual addresses (virt =3D=3D phys). = Copying > + * and zeroing is done using virtual addresses. > + * No relocations inside the function are allowed, as it is copied to an > + * allocated page before being executed. "page" is stated here. Do we need an ASSERT later? > + */ > +void do_kexec(void *kexec_page) > +{ > + unsigned long actions; > + unsigned long stack; > + unsigned long final; > + unsigned long phys; > + > + actions =3D get_kexec_addr(kexec_page, kexec_actions); > + stack =3D get_kexec_addr(kexec_page, kexec_stack + KEXEC_STACK_LONGS= ); > + final =3D get_kexec_addr(kexec_page, kexec_final); > + phys =3D get_kexec_addr(kexec_page, kexec_phys); > + > + memcpy(kexec_page, _kexec_start, KEXEC_SECSIZE); > + asm("cli\n\t" > + "mov %0, %%"ASM_SP"\n\t" > + "mov %1, %%"ASM_ARG1"\n\t" > + "mov %2, %%"ASM_ARG2"\n\t" > + "jmp *%3" > + :"=3Dm" (stack), "=3Dm" (actions), "=3Dm" (phys) Aren't these inputs and not outputs? > + :"m" (final)); > +} > + > +#endif /* CONFIG_KEXEC */ > diff --git a/include/kexec.h b/include/kexec.h > index 6fd96774..722be456 100644 > --- a/include/kexec.h > +++ b/include/kexec.h > @@ -1,7 +1,34 @@ > + > +int kexec_add_action(int action, void *dest, void *src, unsigned int len= ); > + > +#define KEXEC_SECSIZE ((unsigned long)_kexec_end - (unsigned long)_kexec= _start) Add a build assertion here? Or maybe the correct amount is allocated and it doesn't matter. Generally looks good. Regards, Jason From minios-devel-bounces@lists.xenproject.org Sat Jun 14 16:41:33 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Sat, 14 Jun 2025 16:41:33 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1015647.1393192 (Exim 4.92) (envelope-from ) id 1uQTwj-0002DX-QB; Sat, 14 Jun 2025 16:41:33 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1015647.1393192; Sat, 14 Jun 2025 16:41:33 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uQTwj-0002DQ-Nc; Sat, 14 Jun 2025 16:41:33 +0000 Received: by outflank-mailman (input) for mailman id 1015647; Sat, 14 Jun 2025 16:41:32 +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 1uQTwi-00022V-HH for minios-devel@lists.xenproject.org; Sat, 14 Jun 2025 16:41:32 +0000 Received: from mail-yw1-x1134.google.com (mail-yw1-x1134.google.com [2607:f8b0:4864:20::1134]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 6b6bae7c-493e-11f0-b894-0df219b8e170; Sat, 14 Jun 2025 18:41:29 +0200 (CEST) Received: by mail-yw1-x1134.google.com with SMTP id 00721157ae682-70e2b601a6bso31702817b3.0; Sat, 14 Jun 2025 09:41:29 -0700 (PDT) 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: 6b6bae7c-493e-11f0-b894-0df219b8e170 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1749919288; x=1750524088; darn=lists.xenproject.org; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=qJO3DPmTnpimcmFIlDN1TKqKbZ/I+JX6jYAuRKKryfQ=; b=HIeRLtXwS6fGCCSQvHYeSjk0S+Pw5SDGdW/k1qzqHr9eMyuwWm4Wq+g+O8mCqmlWBa 91JTY34nnUo5vzIP3OkcGuf+4pJYiv+rdO8s1+ntu3adQsVuZJXXChDOKXTV11YbhTY8 qt8/llesltUgA+hJ6lNGYsAov4wjB2HtZABPhevGXZ7vqrpw47SwCCEUMNl/hBXhRuxp fov0nf5UPNi5Mtdl0ed4RT8UZv/Bvf1yj0TD7+fYUczmDLreCcVQO2Ur4gYBgbGRMdMH GUYgJlKjgPxW3hZhaYxhF7arE6pjXXcuuMHO8/O+V0iCE05kj/kUSRtzD0/qyUrbnBhS MTlA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1749919288; x=1750524088; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=qJO3DPmTnpimcmFIlDN1TKqKbZ/I+JX6jYAuRKKryfQ=; b=AB7e1lDQUTX6CkS/pBrJ4OQhbk0fMrO1bN50PDDZRJoGdaP/rkSuKc70ZYVvP0uJv4 3zXs2giV8mfRlE53T7wfpvb13gD+zsUoCwdiD0sjj2ltx+e/N4ZfIqnpo238Isg1dBGZ 0FcKYIZ/EGGnoLvwx9k9rz50gBt4cKOgMsNpMLAgcmgjej0obEo/8qIqYPF2ZRwLlanS +TRow+p3OM+XfxZHVxh/bEHvsTwgPTyN8VmDA0MI5gKitq6+ILr0Qxh+MFRtHgOYCcxy LaS7WQv3TeAcqNqkBFculit+ff1msup5NfBxMetJaND+m1ZGxnaebpjj12kFxSFqTIhl R9RQ== X-Forwarded-Encrypted: i=1; AJvYcCXrMXHQjd8nwJtSa+m+fTrOXb2dMkgMRtRaoezpNMhBW9VMoQKS9C99ctXDKzqU0Rn1hT/cjGBIqCM=@lists.xenproject.org X-Gm-Message-State: AOJu0Yx9bReDz7QbqNp0ahgb3p+5OV7suB39rFFanOm8rzIV/iYJcFnl XMg8ODcLl8OfXfrxVOphTsFYCwLckG8OgqtJ2mhLcgD4d5EhJofDaI3AjArLe+Y4DxMnpL5Vj2J GajOhV/2TJ5Ris0ff3CrTscToDl+LrbWvRWQ2 X-Gm-Gg: ASbGnctxuX6TBM25kJokiXZPGJV4i1JAN/vbA8RglsyS/uxLACNix4i4oI10qP89UHS OcybOedmTxhaAFiFGogPcrqyCVTVoum7e0bMBARrr5QMD1DeI+rl9nuCTtVZabfOSvZtE3AIEaH YyLubvFurJDL6lmM5KfBbCIrewJcZV1t2TobImjllZ X-Google-Smtp-Source: AGHT+IEAnAkQsLrLIFAiit2cbF9bQ5JMTM52mtEtI7vNK64Wm4m1DlZAuPMBQ/M4LIXcrt50+ZUHOh/osjgqg6qRb00= X-Received: by 2002:a05:690c:7248:b0:70e:86a:ae1e with SMTP id 00721157ae682-71175448c6fmr49156787b3.22.1749919288240; Sat, 14 Jun 2025 09:41:28 -0700 (PDT) MIME-Version: 1.0 References: <20250321092451.17309-1-jgross@suse.com> <20250321092451.17309-5-jgross@suse.com> In-Reply-To: <20250321092451.17309-5-jgross@suse.com> From: Jason Andryuk Date: Sat, 14 Jun 2025 12:41:17 -0400 X-Gm-Features: AX0GCFudxaAqybZz7opAuHCp3FhTMZE4WZiJAJp3RcPX6BCBtwpT63tnr4klkHA Message-ID: Subject: Re: [MINI-OS PATCH 04/12] kexec: analyze new kernel for kexec To: Juergen Gross Cc: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org, samuel.thibault@ens-lyon.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, Mar 21, 2025 at 5:25=E2=80=AFAM Juergen Gross wro= te: > > Analyze the properties of the new kernel to be loaded by kexec. The > data needed is: > > - upper boundary in final location > - copy and memory clear operations > - entry point and entry parameter > > Signed-off-by: Juergen Gross > + > +static void check_notes_entry(elf_ehdr *ehdr, void *start, unsigned int = len) I think you should rename this to include read_ since it is necessary to set kernel_entry. read_phys32_entry_note() or read_note_kernel_entry() or some variation. To me, check_ implies a boolean return without a side effect. > @@ -54,9 +57,122 @@ > * - The new kernel is activated. > */ > > -int kexec(void *kernel, unsigned long kernel_size, > - const char *cmdline) > +int kexec(void *kernel, unsigned long kernel_size, const char *cmdline) NIT: introduce kexec() with the single line form to avoid changing it Everything else looks good, so preferably with the renaming: Reviewed-by: Jason Andryuk Regards, Jason From minios-devel-bounces@lists.xenproject.org Sat Jun 14 16:43:21 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Sat, 14 Jun 2025 16:43:21 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1015657.1393207 (Exim 4.92) (envelope-from ) id 1uQTyT-0002te-62; Sat, 14 Jun 2025 16:43:21 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1015657.1393207; Sat, 14 Jun 2025 16:43:21 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uQTyT-0002tX-34; 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charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, Mar 21, 2025 at 5:25=E2=80=AFAM Juergen Gross wro= te: > > Finalize the location and the size of the parameters for the new > kernel. This is needed in order to avoid allocating new memory in the > area occupied by the new kernel and parameters. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Sat Jun 14 16:56:39 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Sat, 14 Jun 2025 16:56:39 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1015677.1393230 (Exim 4.92) (envelope-from ) id 1uQUBJ-00056g-Gy; Sat, 14 Jun 2025 16:56:37 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1015677.1393230; Sat, 14 Jun 2025 16:56:37 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uQUBJ-00056Z-EJ; Sat, 14 Jun 2025 16:56:37 +0000 Received: by outflank-mailman (input) for mailman id 1015677; Sat, 14 Jun 2025 16:56:36 +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 1uQUBI-0004sg-5e for minios-devel@lists.xenproject.org; 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Sat, 14 Jun 2025 09:56:31 -0700 (PDT) MIME-Version: 1.0 References: <20250321092451.17309-1-jgross@suse.com> <20250321092451.17309-7-jgross@suse.com> In-Reply-To: <20250321092451.17309-7-jgross@suse.com> From: Jason Andryuk Date: Sat, 14 Jun 2025 12:56:20 -0400 X-Gm-Features: AX0GCFsQc_7JQjDEeTpyXiRlVMtWJznxeSDLm-k3l0EiyYD_6g9G_3l3BTKJE_A Message-ID: Subject: Re: [MINI-OS PATCH 06/12] kexec: reserve memory below boundary To: Juergen Gross Cc: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org, samuel.thibault@ens-lyon.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, Mar 21, 2025 at 5:31=E2=80=AFAM Juergen Gross wro= te: > > In order to support kexec any memory used during copying the new > kernel to its final destination must not overlap with the destination > area. > > In order to achieve that add a new interface allowing to mark all > allocatable memory below a specific physical address as not available. > > This is done by walking through all chunks of the buddy allocator and > removing the chunks (or chunk parts) below the boundary. The removed > chunks are put into a list in order to be able to undo the operation > in case kexec is failing before doing any unrecoverable system > modifications. > > Any pages freed located below the boundary need to go directly into > the list of reserved pages instead of the free pool. > > Call the new function from kexec code. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Sat Jun 14 17:02:55 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Sat, 14 Jun 2025 17:02:55 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1015689.1393234 (Exim 4.92) (envelope-from ) id 1uQUHN-0006p8-Vg; Sat, 14 Jun 2025 17:02:53 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1015689.1393234; Sat, 14 Jun 2025 17:02:53 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uQUHN-0006p1-T9; 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charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, Mar 21, 2025 at 5:30=E2=80=AFAM Juergen Gross wro= te: > > Build the parameters for the new kernel, consisting of the > hvm_start_info struct, the memory map and the command line. > > Signed-off-by: Juergen Gross > @@ -212,4 +213,61 @@ void kexec_set_param_loc(const char *cmdline) > + > + /* The call of the new kernel happens via the physical address! */ > + if ( kexec_add_action(KEXEC_CALL, (void *)kernel_entry, Maybe kernel_entry_pa, kernel_phys32_entry, or kernel_phys_entry would be a better name to make the physical address clear? Either way: Reviewed-by: Jason Andryuk Regards, Jason From minios-devel-bounces@lists.xenproject.org Sat Jun 14 17:19:53 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Sat, 14 Jun 2025 17:19:53 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1015720.1393249 (Exim 4.92) (envelope-from ) id 1uQUXn-0000UZ-HA; Sat, 14 Jun 2025 17:19:51 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1015720.1393249; Sat, 14 Jun 2025 17:19:51 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uQUXn-0000UR-Dw; Sat, 14 Jun 2025 17:19:51 +0000 Received: by outflank-mailman (input) for mailman id 1015720; Sat, 14 Jun 2025 17:19:50 +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 1uQUXm-0000UH-KQ for minios-devel@lists.xenproject.org; Sat, 14 Jun 2025 17:19:50 +0000 Received: from mail-yw1-x1134.google.com (mail-yw1-x1134.google.com [2607:f8b0:4864:20::1134]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id c53187be-4943-11f0-b894-0df219b8e170; Sat, 14 Jun 2025 19:19:47 +0200 (CEST) Received: by mail-yw1-x1134.google.com with SMTP id 00721157ae682-70e40e3f316so22862127b3.0; Sat, 14 Jun 2025 10:19:47 -0700 (PDT) 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: c53187be-4943-11f0-b894-0df219b8e170 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1749921586; x=1750526386; darn=lists.xenproject.org; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=S5+N1kbLD+IUbDgxWMy//0LLQepPeelA35Ixfb+CwiA=; b=NBwsDE8PyEguPK5afSFuePtMPMxNhMJmOicbPAVOuE8yVT2AltlOTqdusQ5IoRnuOM jGjOGFPKVIvbktTiFBV7qGNag875eK3ZSw62f9DW3FRZMo5CSWw/VzJlHrTUUN6O1Knz XWAPcV1+HOr5frZiJfZ5A3huJRGnV1mpXPR2nyfG96g9Ln5EN94C/yhwbRZEFCyuaepq Y+AZwCAgOO2I1gxrJkewMAw+y/VeyGOZ5u3kmKA+bwZaohyG5y5K1maMtHerExTPTLUz 4Lyo4uJshLOrZuGc8EnKaYZE954eTIjd6+dG2+rSUzpHmCR8MlDgmm1i2ixFM0gB5UuN nesw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1749921586; x=1750526386; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=S5+N1kbLD+IUbDgxWMy//0LLQepPeelA35Ixfb+CwiA=; b=AHI3ZrGtiwBL3MTeeBVezmDF1K3PRvapkKy7OzTmerAeAJsINs7IIN5JZDvFypYos2 SmVv8R0+RPXtNWRXLhJ9A+aNGgeL/qw5cp5gESgAv0dcXzqMtWNV+FUWG6O5chRvlvNo i/4iGPONgCqHxSbk4OKPOIWwKXQ79U2fz1g1eC6wNlrd5xWkaE5Jj3UATkhTWZ3LQpWN 5uzDg5U8kyyiajPtQV28fr9C+E7F+5gTSLny5egrs9PpOtLd0hS3AnBfJeYT49keMGoJ eyqXSWxNHNM5yo9yFkxZtfhHsdoQJ7caOzJqRhiIUPhBnyqePnBUK/EGenPQveeKxO2j ctjw== X-Forwarded-Encrypted: i=1; AJvYcCW4zCuEZK8ljhchxSfn79wmUp30MAOvsVEAsPgR/sq0DIzonwytTEs3af+dtkAi86S1S6kOn/6BPu4=@lists.xenproject.org X-Gm-Message-State: AOJu0YykUaBI8lMkFjYR6wSgn8WAQDezlrh6RhJ0C8tcUKrqw9CdTR58 Hq2TztM+t8EFQT2uYn8x5bZ2HnIx3GAoJb+nDzNYZaXGgBX/jbMagyKVCZcqnpRF/j7X3aOgp6m 07T+DoqyONOFFbJwaJRP8J6xBCjta8HY= X-Gm-Gg: ASbGncu9dtj34IAltHCMIoiHcAKLdnY7WWE06aN99OzH9D9ynt7m674igjQGE4WNyQv evSbUrhEu/dE5b969qPUl9t00+N1aijrCjCRTUbEO/nc7T6GW+kDbPLfsO33ebym2vwBtXS99Wc 6yLzk/iWE6Yurt1i+24TDlpTpGYLeSIy8CsIMQmg0O X-Google-Smtp-Source: AGHT+IE4LIYBSmlVS/6k0rpCv0XLrSjXfkcQ20TNpGSk3ZsAIDJfeS5dHcRlzrgktwdNA4l7hOamsRcTlGnYcGs7/YQ= X-Received: by 2002:a05:690c:e:b0:70c:b685:a6b7 with SMTP id 00721157ae682-7117542acbamr49505167b3.21.1749921586367; Sat, 14 Jun 2025 10:19:46 -0700 (PDT) MIME-Version: 1.0 References: <20250321092451.17309-1-jgross@suse.com> <20250321092451.17309-9-jgross@suse.com> In-Reply-To: <20250321092451.17309-9-jgross@suse.com> From: Jason Andryuk Date: Sat, 14 Jun 2025 13:19:35 -0400 X-Gm-Features: AX0GCFv_TqYUW0fUZPc6Vd_64H8YW9QGcFaIkeY72FFc-on-IPVkwyXOwCIQMOY Message-ID: Subject: Re: [MINI-OS PATCH 08/12] kexec: move used pages away for new kernel To: Juergen Gross Cc: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org, samuel.thibault@ens-lyon.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, Mar 21, 2025 at 5:30=E2=80=AFAM Juergen Gross wro= te: > > Copying the new kexec kernel must not overwrite any pages still needed > during this process. Those are especially the GDT, IDT and page tables. > > Move those to new allocated pages and update any related pointers. > > In case the kexec process is cancelled later, don't undo any page table > moves, as the system can just be used with the new layout. By freeing > the original pages there is no memory leaking. > > GDT and IDT should be reverted to their original locations, as their > original memory can't be freed due to not being whole pages. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Sat Jun 14 17:25:53 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Sat, 14 Jun 2025 17:25:53 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1015734.1393262 (Exim 4.92) (envelope-from ) id 1uQUdc-0002Im-6B; Sat, 14 Jun 2025 17:25:52 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1015734.1393262; Sat, 14 Jun 2025 17:25:52 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uQUdc-0002If-3Y; Sat, 14 Jun 2025 17:25:52 +0000 Received: by outflank-mailman (input) for mailman id 1015734; 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charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, Mar 21, 2025 at 5:31=E2=80=AFAM Juergen Gross wro= te: > > Rename set_readonly() to change_readonly() and add a parameter > specifying whether it should set the kernel to readonly or to writable. > At the same time move the boundary setting from the only caller into > the function itself, avoiding the need to use the same boundaries in > future, when it will be called to set the kernel to writable again. > Make the function globally visible in order to allow calling it from > kexec coding later. > > Merge clear_bootstrap() into change_readonly() and undo its setting of > page 0 to invalid when setting the kernel writable. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Sat Jun 14 17:26:50 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Sat, 14 Jun 2025 17:26:50 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1015747.1393280 (Exim 4.92) (envelope-from ) id 1uQUeY-0002uX-MF; 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Sat, 14 Jun 2025 10:26:44 -0700 (PDT) MIME-Version: 1.0 References: <20250321092451.17309-1-jgross@suse.com> <20250321092451.17309-11-jgross@suse.com> In-Reply-To: <20250321092451.17309-11-jgross@suse.com> From: Jason Andryuk Date: Sat, 14 Jun 2025 13:26:33 -0400 X-Gm-Features: AX0GCFv_vQ1r_KhhIS-I2AjPO6bAA15N3f0sysGZJIN02eP_RvQ3_B2THRGVnjQ Message-ID: Subject: Re: [MINI-OS PATCH 10/12] kexec: switch read-only area to be writable again To: Juergen Gross Cc: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org, samuel.thibault@ens-lyon.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, Mar 21, 2025 at 5:30=E2=80=AFAM Juergen Gross wro= te: > > In order to allow writing the new kernel, make the readonly area > covering current kernel text writable again. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Sat Jun 14 17:34:59 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Sat, 14 Jun 2025 17:34:59 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1015759.1393300 (Exim 4.92) (envelope-from ) id 1uQUmQ-000520-EO; 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Sat, 14 Jun 2025 10:34:53 -0700 (PDT) MIME-Version: 1.0 References: <20250321092451.17309-1-jgross@suse.com> <20250321092451.17309-12-jgross@suse.com> In-Reply-To: <20250321092451.17309-12-jgross@suse.com> From: Jason Andryuk Date: Sat, 14 Jun 2025 13:34:42 -0400 X-Gm-Features: AX0GCFsg2jB4J4zs2QFEH31Q5A472MF0rLBTdx-U_3wX75rW_56ooDO23PVenUU Message-ID: Subject: Re: [MINI-OS PATCH 11/12] kexec: add kexec callback functionality To: Juergen Gross Cc: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org, samuel.thibault@ens-lyon.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, Mar 21, 2025 at 5:32=E2=80=AFAM Juergen Gross wro= te: > > Add a kexec_call() macro which will provide the capability to register > a function for being called when doing a kexec() call. The called > functions will be called with a boolean parameter "undo" indicating > whether a previous call needs to be undone due to a failure during > kexec(). > > The related loop to call all callbacks is added to kexec(). > > Signed-off-by: Juergen Gross > diff --git a/arch/x86/mm.c b/arch/x86/mm.c > index f4419d95..26ede6f4 100644 > --- a/arch/x86/mm.c > +++ b/arch/x86/mm.c > @@ -529,7 +529,8 @@ void change_readonly(bool readonly) > #endif > } > > - printk("setting %p-%p readonly\n", &_text, &_erodata); > + printk("setting %p-%p %s\n", &_text, &_erodata, > + readonly ? "readonly" : "writable"); Oh, I think this belongs in the earlier change. With that moved, this one (and the earlier one still) Code wise: Reviewed-by: Jason Andryuk But this kexec_call() macro isn't actually used? xenstore needs this to prepare for kexec? Regards, Jason From minios-devel-bounces@lists.xenproject.org Sat Jun 14 17:39:46 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Sat, 14 Jun 2025 17:39:46 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1015770.1393305 (Exim 4.92) (envelope-from ) id 1uQUr3-0005RJ-Q5; Sat, 14 Jun 2025 17:39:45 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1015770.1393305; Sat, 14 Jun 2025 17:39:45 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uQUr3-0005RC-NB; Sat, 14 Jun 2025 17:39:45 +0000 Received: by outflank-mailman (input) for mailman id 1015770; Sat, 14 Jun 2025 17:39:44 +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 1uQUr2-0005R1-QH for minios-devel@lists.xenproject.org; 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Sat, 14 Jun 2025 10:39:42 -0700 (PDT) MIME-Version: 1.0 References: <20250321092451.17309-1-jgross@suse.com> <20250321092451.17309-13-jgross@suse.com> In-Reply-To: <20250321092451.17309-13-jgross@suse.com> From: Jason Andryuk Date: Sat, 14 Jun 2025 13:39:30 -0400 X-Gm-Features: AX0GCFva5OuwNXiOtNVtyFBSFpS4kWTwv5OKhrzObljnqSvIVGzUBq0rmIGD1TY Message-ID: Subject: Re: [MINI-OS PATCH 12/12] kexec: do the final kexec step To: Juergen Gross Cc: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org, samuel.thibault@ens-lyon.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, Mar 21, 2025 at 5:30=E2=80=AFAM Juergen Gross wro= te: > > With all kexec preparations done, activate the new kernel. > > Signed-off-by: Juergen Gross > --- > kexec.c | 17 +++++++++++++++-- > 1 file changed, 15 insertions(+), 2 deletions(-) > > diff --git a/kexec.c b/kexec.c > index 2db876e8..85b09959 100644 > --- a/kexec.c > +++ b/kexec.c > @@ -169,6 +169,7 @@ int kexec(void *kernel, unsigned long kernel_size, co= nst char *cmdline) > @@ -192,6 +193,13 @@ int kexec(void *kernel, unsigned long kernel_size, c= onst char *cmdline) > if ( ret ) > goto err; > > + kexec_page =3D (void *)alloc_page(); kexec_page() is referenced already in do_kexec(), but it hasn't been hooked up yet, right? I guess that is okay. If not an ASSERT on 1 page, then allocate KEXEC_SECSIZE? 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micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------c1i91g09BY09HIQD05xjnWJE" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------c1i91g09BY09HIQD05xjnWJE Content-Type: multipart/mixed; boundary="------------GXQaY9QphCH00dkYtbUAWd00"; protected-headers="v1" From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= To: Jason Andryuk Cc: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org, samuel.thibault@ens-lyon.org Message-ID: Subject: Re: [MINI-OS PATCH 01/12] kexec: add kexec framework References: <20250321092451.17309-1-jgross@suse.com> <20250321092451.17309-2-jgross@suse.com> In-Reply-To: --------------GXQaY9QphCH00dkYtbUAWd00 Content-Type: multipart/mixed; boundary="------------JQrCHYqapAtOz1SfzK44M06F" --------------JQrCHYqapAtOz1SfzK44M06F Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: base64 SmFzb24sDQoNCnRoYW5rcyBmb3IgaGF2aW5nIGEgbG9vayBhdCB0aGUgc2VyaWVzISBJIHZl 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application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- wsB5BAABCAAjFiEEhRJncuj2BJSl0Jf3sN6d1ii/Ey8FAmhPrk8FAwAAAAAACgkQsN6d1ii/Ey87 fggAhswXmpvmF9HUuRnYGL/ul17z+fyh4TY2YMfllJc1W2v9MO9hbm/u9KUauFZpQsCDV8KxChjg csfsPpkzWAMPl9wRMFllp9J5XyFNnemntadytKA8L2qZx68CsFMC6CgISM55of2AaU7TaniLI4pN vVrEtmPShUTjGF3K41IZiFgPWcZppMaKPWhCXTRF12wZMppoa3EYjNIDTgr+/2sg3E41AohbTzBL LJDOjXWHUP0TnQPztDHIpo6gnrwfuy7S67pTS4aj0OlQ1UoI9ZDaCNou97fRMszJSRhwLGZbX+GG P2B+J0qHPl/6Q33pZ0I07argTwD1hXsZHXAQs6hBpg== =I9Js -----END PGP SIGNATURE----- --------------c1i91g09BY09HIQD05xjnWJE-- From minios-devel-bounces@lists.xenproject.org Mon Jun 16 06:14:00 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 16 Jun 2025 06:14:00 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1016466.1393366 (Exim 4.92) (envelope-from ) id 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Sun, 15 Jun 2025 23:13:47 -0700 (PDT) Message-ID: <468294fd-8804-4099-866c-8ca98436e29a@suse.com> Date: Mon, 16 Jun 2025 08:13:46 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 02/12] kexec: add final kexec stage To: Jason Andryuk Cc: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org, samuel.thibault@ens-lyon.org References: <20250321092451.17309-1-jgross@suse.com> <20250321092451.17309-3-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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Sun, 15 Jun 2025 23:42:32 -0700 (PDT) Message-ID: <11e127a7-ce8d-4704-b7ce-33dd998a4a54@suse.com> Date: Mon, 16 Jun 2025 08:42:31 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 04/12] kexec: analyze new kernel for kexec To: Jason Andryuk Cc: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org, samuel.thibault@ens-lyon.org References: <20250321092451.17309-1-jgross@suse.com> <20250321092451.17309-5-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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Mon, 16 Jun 2025 00:00:29 -0700 (PDT) Message-ID: <8971cebb-6b31-4de1-bed9-4b2d8a03f65d@suse.com> Date: Mon, 16 Jun 2025 09:00:28 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 07/12] kexec: build parameters for new kernel To: Jason Andryuk Cc: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org, samuel.thibault@ens-lyon.org References: <20250321092451.17309-1-jgross@suse.com> <20250321092451.17309-8-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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Mon, 16 Jun 2025 00:08:44 -0700 (PDT) Message-ID: Date: Mon, 16 Jun 2025 09:08:43 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 11/12] kexec: add kexec callback functionality To: Jason Andryuk Cc: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org, samuel.thibault@ens-lyon.org References: <20250321092451.17309-1-jgross@suse.com> <20250321092451.17309-12-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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Mon, 16 Jun 2025 00:09:45 -0700 (PDT) Message-ID: <8ec281cf-0492-46b3-ae6b-ec3f2e595498@suse.com> Date: Mon, 16 Jun 2025 09:09:44 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 12/12] kexec: do the final kexec step To: Jason Andryuk Cc: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org, samuel.thibault@ens-lyon.org References: <20250321092451.17309-1-jgross@suse.com> <20250321092451.17309-13-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 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/Ey8FAmhPwzkFAwAAAAAACgkQsN6d1ii/Ey+d 4Qf+PzkYR5iEiTxWy9+kmeG83qC1jG6gN1TKBhynJneUSMsZEuXQuNCcueKxOIFiMo8AjJJ3Ryrh S1gJCfH/YbNQ+aEojbVnUgPWTM+W/g3Vdqqx7uwvhMtkqAqCoGpe+27XblmVf8ol6qk2EBWcU0zv dBh5liNl5WZzXO3WojgzhJHvv9dDyejDzAGGvQTQVraZvyJrT0QOlT/7jYuc/e2Uc4dJIFRlL7wK Q8NOznh1eRykTflUzVZyP9pvM/1fRu5FwBVwuto9+FDJrizgWyiRG2WPr4iq2lsBcDX2W8lqwbRj MlT1PMBvQLJ4C2Vt3yNioGcCcgMR8D3SJz2IKEwe+w== =tEZy -----END PGP SIGNATURE----- --------------A4dlste03f9KB1rlEcMDuTgz-- From minios-devel-bounces@lists.xenproject.org Mon Jun 16 08:46:30 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 16 Jun 2025 08:46:30 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1016878.1393842 (Exim 4.92) (envelope-from ) id 1uR5U4-0007hi-Kh; Mon, 16 Jun 2025 08:46:28 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1016878.1393842; 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bh=T4caMaW8bugDRSGPfSz/ynH/nu5eTDf2OXty7FDoRQY=; b=JAQq61Cpb3tVLl1TFx2NqWBYwNpGZUJqgo//fULC+siz5DGwF3yLMFnIWBbxTMumWVtu+S 2SQLeV5o73fye1Ei0umtxHHfalcBANRZhDS1W0mHTXrfVAn2WgT3SXZ3HdaIV4eIPDyPJX o7gopzFyv5GweCwCDKlytGxQQJSpRI0= Authentication-Results: smtp-out1.suse.de; dkim=pass header.d=suse.com header.s=susede1 header.b=gH0t1Ce5 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750063581; 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=T4caMaW8bugDRSGPfSz/ynH/nu5eTDf2OXty7FDoRQY=; b=gH0t1Ce5jC8inaTPV+MV2kZyg6G2BCFmwbuXNDJIcAqNHPtQaU4yVBirL4eRDiIQiqQ+6B cMJEVjY4gtYdgUp9og16JwT31ssHWMUFYYZMaFun0szb18/FcKQQ+r2WjZtJodyYvNecdb w2CgnrvPccxQIM42qalMrCkOGasG5Ug= 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 00/12] kexec: add kexec support to Mini-OS Date: Mon, 16 Jun 2025 10:46:07 +0200 Message-ID: <20250616084619.11112-1-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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With this series applied it is possible to activate another kernel from within Mini-OS. Right now no Xen related teardown is done (so no reset of grant table, event channels, PV devices). These should be added via kexec callbacks which are added as a framework. This is a major building block for support of Xenstore-stubdom live update (in fact I've tested the kexec path to work using the PVH variant of Xenstore-stubdom). Changes in V2: - addressed comments Juergen Gross (12): add kexec framework Mini-OS: add final kexec stage mini-os: add elf.h mini-os: analyze new kernel for kexec mini-os: kexec: finalize parameter location and size mini-os: reserve memory below boundary mini-os: kexec: build parameters for new kernel mini-os: kexec: move used pages away for new kernel Mini-OS: mm: change set_readonly() to change_readonly() Mini-OS: kexec: switch read-only area to be writable again mini-os: kexec: add kexec callback functionality mini-os: kexec: do the final kexec step Config.mk | 1 + Makefile | 1 + arch/x86/kexec.c | 272 +++++++++++++++++++++++++++++++++ arch/x86/minios-x86.lds.S | 17 +++ arch/x86/mm.c | 238 ++++++++++++++++++++++------- arch/x86/testbuild/all-no | 1 + arch/x86/testbuild/all-yes | 2 + arch/x86/testbuild/kexec | 4 + arch/x86/x86_hvm.S | 46 ++++++ include/elf.h | 300 +++++++++++++++++++++++++++++++++++++ include/kexec.h | 63 ++++++++ include/mm.h | 8 + include/x86/os.h | 5 + kexec.c | 252 +++++++++++++++++++++++++++++++ mm.c | 89 ++++++++++- 15 files changed, 1248 insertions(+), 51 deletions(-) create mode 100644 arch/x86/kexec.c create mode 100644 arch/x86/testbuild/kexec create mode 100644 include/elf.h create mode 100644 include/kexec.h create mode 100644 kexec.c -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Mon Jun 16 08:46:32 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 16 Jun 2025 08:46:32 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1016879.1393846 (Exim 4.92) (envelope-from ) id 1uR5U8-0007jg-Me; 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Mon, 16 Jun 2025 08:46:27 +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 F3F4A139E2; Mon, 16 Jun 2025 08:46:26 +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 b8obOuLZT2jgPwAAD6G6ig (envelope-from ); Mon, 16 Jun 2025 08:46:26 +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: 658187c2-4a8e-11f0-a309-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750063587; 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=eIbkCenoZvqJqr3MP5CvMO1uqc+kjXWDfidavHJfSOg=; b=E4B/oENMbf4MVYNW+Xi+9rgx/R78CrdQ/RHbovg0TUQ9U/kZqBKiOQftJ/bJnKg/BGnGdG ZJn/UqW3DfyzvC4yEJLjrBTJKcJRjBUbp9qc0F6nJGRRhli9N20MoDbbEEU75ow3HJ34px BTKmSsmkCr++8XAiw79XqPCM3ydFqjk= Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750063587; 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=eIbkCenoZvqJqr3MP5CvMO1uqc+kjXWDfidavHJfSOg=; b=E4B/oENMbf4MVYNW+Xi+9rgx/R78CrdQ/RHbovg0TUQ9U/kZqBKiOQftJ/bJnKg/BGnGdG ZJn/UqW3DfyzvC4yEJLjrBTJKcJRjBUbp9qc0F6nJGRRhli9N20MoDbbEEU75ow3HJ34px BTKmSsmkCr++8XAiw79XqPCM3ydFqjk= 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 01/12] add kexec framework Date: Mon, 16 Jun 2025 10:46:08 +0200 Message-ID: <20250616084619.11112-2-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250616084619.11112-1-jgross@suse.com> References: <20250616084619.11112-1-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_FIVE(0.00)[5]; 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,amd.com:email]; RCVD_TLS_ALL(0.00)[] X-Spam-Level: X-Spam-Flag: NO X-Spam-Score: -2.80 Add a new config option CONFIG_KEXEC for support of kexec-ing into a new mini-os kernel. Add a related kexec.c source and a kexec.h header. For now allow CONFIG_KEXEC to be set only for PVH variant of mini-os. Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- V2: - reword some comments (Jason Andryuk) --- Config.mk | 1 + Makefile | 1 + arch/x86/testbuild/all-no | 1 + arch/x86/testbuild/all-yes | 2 ++ arch/x86/testbuild/kexec | 4 +++ include/kexec.h | 7 +++++ kexec.c | 60 ++++++++++++++++++++++++++++++++++++++ 7 files changed, 76 insertions(+) create mode 100644 arch/x86/testbuild/kexec create mode 100644 include/kexec.h create mode 100644 kexec.c diff --git a/Config.mk b/Config.mk index e493533a..e2afb1b4 100644 --- a/Config.mk +++ b/Config.mk @@ -204,6 +204,7 @@ CONFIG-n += CONFIG_LIBXENGUEST CONFIG-n += CONFIG_LIBXENTOOLCORE CONFIG-n += CONFIG_LIBXENTOOLLOG CONFIG-n += CONFIG_LIBXENMANAGE +CONFIG-n += CONFIG_KEXEC # Setting CONFIG_USE_XEN_CONSOLE copies all print output to the Xen emergency # console apart of standard dom0 handled console. CONFIG-n += CONFIG_USE_XEN_CONSOLE diff --git a/Makefile b/Makefile index d094858a..a64913ad 100644 --- a/Makefile +++ b/Makefile @@ -51,6 +51,7 @@ src-y += gntmap.c src-y += gnttab.c src-y += hypervisor.c src-y += kernel.c +src-$(CONFIG_KEXEC) += kexec.c src-y += lock.c src-y += main.c src-y += mm.c diff --git a/arch/x86/testbuild/all-no b/arch/x86/testbuild/all-no index 5b3e99ed..b2ee5ce8 100644 --- a/arch/x86/testbuild/all-no +++ b/arch/x86/testbuild/all-no @@ -18,3 +18,4 @@ CONFIG_LIBXS = n CONFIG_LWIP = n CONFIG_BALLOON = n CONFIG_USE_XEN_CONSOLE = n +CONFIG_KEXEC = n diff --git a/arch/x86/testbuild/all-yes b/arch/x86/testbuild/all-yes index 8ae489a4..c9a990f9 100644 --- a/arch/x86/testbuild/all-yes +++ b/arch/x86/testbuild/all-yes @@ -19,3 +19,5 @@ CONFIG_BALLOON = y CONFIG_USE_XEN_CONSOLE = y # The following are special: they need support from outside CONFIG_LWIP = n +# KEXEC not implemented for PARAVIRT +CONFIG_KEXEC = n diff --git a/arch/x86/testbuild/kexec b/arch/x86/testbuild/kexec new file mode 100644 index 00000000..ea17b4d9 --- /dev/null +++ b/arch/x86/testbuild/kexec @@ -0,0 +1,4 @@ +CONFIG_PARAVIRT = n +CONFIG_BALLOON = y +CONFIG_USE_XEN_CONSOLE = y +CONFIG_KEXEC = y diff --git a/include/kexec.h b/include/kexec.h new file mode 100644 index 00000000..6fd96774 --- /dev/null +++ b/include/kexec.h @@ -0,0 +1,7 @@ +#ifndef _KEXEC_H +#define _KEXEC_H + +int kexec(void *kernel, unsigned long kernel_size, + const char *cmdline); + +#endif /* _KEXEC_H */ diff --git a/kexec.c b/kexec.c new file mode 100644 index 00000000..7fcc5c6b --- /dev/null +++ b/kexec.c @@ -0,0 +1,60 @@ +/****************************************************************************** + * kexec.c + * + * Support of kexec (reboot locally into new mini-os kernel). + * + * Copyright (c) 2024, Juergen Gross, SUSE Linux GmbH + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to + * deal in the Software without restriction, including without limitation the + * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or + * sell copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + +#ifdef CONFIG_PARAVIRT +#error "kexec support not implemented in PV variant" +#endif + +#include +#include +#include +#include + +/* + * General approach for kexec support (PVH only) is as follows: + * + * - New kernel needs to be in memory in form of a ELF binary in a virtual + * memory region. + * - A new start_info structure is constructed in memory with the final + * memory locations included. + * - Page tables and memory pages of the new kernel binary conflicting with the + * final memory layout are moved to non-conflicting locations. + * - All memory areas needed for kexec execution are being finalized. + * - The final kexec execution stage is copied to a memory area below 4G which + * doesn't conflict with the target areas of kernel etc. + * - From here on a graceful failure is no longer possible. + * - Grants and event channels are torn down. + * - Execution continues in the final execution stage. + * - All data is copied to its final addresses. + * - CPU is switched to 32-bit mode with paging disabled. + * - The new kernel is activated. + */ + +int kexec(void *kernel, unsigned long kernel_size, const char *cmdline) +{ + return ENOSYS; +} +EXPORT_SYMBOL(kexec); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Mon Jun 16 08:46:37 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 16 Jun 2025 08:46:37 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1016882.1393861 (Exim 4.92) (envelope-from ) id 1uR5UD-00080q-0n; Mon, 16 Jun 2025 08:46:37 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1016882.1393861; Mon, 16 Jun 2025 08:46:36 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uR5UC-00080j-UM; Mon, 16 Jun 2025 08:46:36 +0000 Received: by outflank-mailman (input) for mailman id 1016882; Mon, 16 Jun 2025 08:46:35 +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 1uR5UB-0007hV-6x for minios-devel@lists.xenproject.org; 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Mon, 16 Jun 2025 08:46:32 +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: 679a7b71-4a8e-11f0-b894-0df219b8e170 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750063592; 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=2H0qWHO5jB15jbB7hAMsbxc9Fi6ipKfWjIbEbuSKCeQ=; b=NeAmfA7S9fIDRKkgzKVn9X+cNEBpZmm/+MEtqjZMNR0ycHN2YxdYXQXV/9y+Lfv54S0xAE j5zIC63cOCV0aSlTw/ITmkUpJXD7a6Cyuw55QtKa/TqWxoXs/JGgEFbKYxIR4zi42ZWZJQ foKRyKDHZL2eWOGt9ZtvtWu5PkQbzBE= Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750063592; 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=2H0qWHO5jB15jbB7hAMsbxc9Fi6ipKfWjIbEbuSKCeQ=; b=NeAmfA7S9fIDRKkgzKVn9X+cNEBpZmm/+MEtqjZMNR0ycHN2YxdYXQXV/9y+Lfv54S0xAE j5zIC63cOCV0aSlTw/ITmkUpJXD7a6Cyuw55QtKa/TqWxoXs/JGgEFbKYxIR4zi42ZWZJQ foKRyKDHZL2eWOGt9ZtvtWu5PkQbzBE= 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 02/12] Mini-OS: add final kexec stage Date: Mon, 16 Jun 2025 10:46:09 +0200 Message-ID: <20250616084619.11112-3-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250616084619.11112-1-jgross@suse.com> References: <20250616084619.11112-1-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 Add the code and data definitions of the final kexec stage. Put the code and related data into a dedicated section in order to be able to copy it to another location. For this reason there must be no absolute relocations being used in the code or data. Being functionally related, add a function for adding a final kexec action. Signed-off-by: Juergen Gross --- V2: - add ASSERT() to linker script (Jason Andryuk) - fix asm() input/output parameter bug (Jason Andryuk) --- arch/x86/kexec.c | 107 ++++++++++++++++++++++++++++++++++++++ arch/x86/minios-x86.lds.S | 9 ++++ arch/x86/x86_hvm.S | 46 ++++++++++++++++ include/kexec.h | 27 ++++++++++ include/x86/os.h | 5 ++ kexec.c | 22 ++++++++ 6 files changed, 216 insertions(+) create mode 100644 arch/x86/kexec.c diff --git a/arch/x86/kexec.c b/arch/x86/kexec.c new file mode 100644 index 00000000..a8a2fa97 --- /dev/null +++ b/arch/x86/kexec.c @@ -0,0 +1,107 @@ +/****************************************************************************** + * kexec.c + * + * Support of kexec (reboot locally into new mini-os kernel). + * + * Copyright (c) 2024, Juergen Gross, SUSE Linux GmbH + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to + * deal in the Software without restriction, including without limitation the + * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or + * sell copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + +#ifdef CONFIG_KEXEC + +#include +#include +#include + +/* + * Final stage of kexec. Copies all data to the final destinations, zeroes + * .bss and activates new kernel. + * Must be called with interrupts off. Stack, code and data must be + * accessible via identity mapped virtual addresses (virt == phys). Copying + * and zeroing is done using virtual addresses. + * No relocations inside the function are allowed, as it is copied to an + * allocated page before being executed. + */ +static void __attribute__((__section__(".text.kexec"))) + kexec_final(struct kexec_action *actions, unsigned long real) +{ + char *src, *dest; + unsigned int a, cnt; + + for ( a = 0; ; a++ ) + { + switch ( actions[a].action ) + { + case KEXEC_COPY: + dest = actions[a].dest; + src = actions[a].src; + for ( cnt = 0; cnt < actions[a].len; cnt++ ) + *dest++ = *src++; + break; + + case KEXEC_ZERO: + dest = actions[a].dest; + for ( cnt = 0; cnt < actions[a].len; cnt++ ) + *dest++ = 0; + break; + + case KEXEC_CALL: + asm("movl %0, %%ebx\n\t" + "movl %1, %%edi\n\t" + "jmp *%2" + : :"m" (actions[a].src), "m" (actions[a].dest), "m" (real)); + break; + } + } +} + +#define KEXEC_STACK_LONGS 8 +static unsigned long __attribute__((__section__(".data.kexec"))) + kexec_stack[KEXEC_STACK_LONGS]; + +static unsigned long get_kexec_addr(void *kexec_page, void *addr) +{ + unsigned long off = (unsigned long)addr - (unsigned long)_kexec_start; + + return (unsigned long)kexec_page + off; +} + +void do_kexec(void *kexec_page) +{ + unsigned long actions; + unsigned long stack; + unsigned long final; + unsigned long phys; + + actions = get_kexec_addr(kexec_page, kexec_actions); + stack = get_kexec_addr(kexec_page, kexec_stack + KEXEC_STACK_LONGS); + final = get_kexec_addr(kexec_page, kexec_final); + phys = get_kexec_addr(kexec_page, kexec_phys); + + memcpy(kexec_page, _kexec_start, KEXEC_SECSIZE); + asm("cli\n\t" + "mov %0, %%"ASM_SP"\n\t" + "mov %1, %%"ASM_ARG1"\n\t" + "mov %2, %%"ASM_ARG2"\n\t" + "jmp *%3" + : :"m" (stack), "m" (actions), "m" (phys), "m" (final)); +} + +#endif /* CONFIG_KEXEC */ diff --git a/arch/x86/minios-x86.lds.S b/arch/x86/minios-x86.lds.S index 8aae2fd6..8a1db7d4 100644 --- a/arch/x86/minios-x86.lds.S +++ b/arch/x86/minios-x86.lds.S @@ -87,6 +87,15 @@ SECTIONS _edata = .; /* End of data section */ + . = ALIGN(8); + _kexec_start = .; /* Kexec relocatable code/data */ + .kexec : { + *(.text.kexec) + *(.data.kexec) + } + _kexec_end = .; + ASSERT(_kexec_end - _kexec_start <= 4096, "kexec code/data > 1 page") + __bss_start = .; /* BSS */ .bss : { *(.bss) diff --git a/arch/x86/x86_hvm.S b/arch/x86/x86_hvm.S index 42a5f02e..e2f82e96 100644 --- a/arch/x86/x86_hvm.S +++ b/arch/x86/x86_hvm.S @@ -85,4 +85,50 @@ page_table_l2: #endif .align __PAGE_SIZE, 0 +#ifdef CONFIG_KEXEC +.section .text.kexec, "ax", @progbits + +/* + * Switch off paging and call new OS for kexec. + * %ebx holds the physical address of the start_info structure + * %edi holds the physical address of the entry point to call + */ +.globl kexec_phys +kexec_phys: + /* Set DS, ES, SS to 0...ffffffff. */ + mov $(GDTE_DS32_DPL0 * 8), %eax + mov %eax, %ds + mov %eax, %es + mov %eax, %ss + +#ifdef __x86_64__ + /* Switch to 32-bit mode. */ + pushq $(GDTE_CS32_DPL0 * 8) + lea cs32_switch(%rip),%edx + push %rdx + lretq + + .code32 +cs32_switch: +#endif + /* Set %cr0 and %cr4 (disables paging). */ + mov $X86_CR0_PE, %eax + mov %eax, %cr0 + mov $0, %eax + mov %eax, %cr4 +#ifdef __x86_64__ + /* Disable 64-bit mode. */ + mov $MSR_EFER, %ecx + rdmsr + btr $_EFER_LME, %eax + wrmsr +#endif + + jmp *%edi + +#ifdef __x86_64__ + .code64 +#endif +#endif /* CONFIG_KEXEC */ + .text diff --git a/include/kexec.h b/include/kexec.h index 6fd96774..722be456 100644 --- a/include/kexec.h +++ b/include/kexec.h @@ -1,7 +1,34 @@ #ifndef _KEXEC_H #define _KEXEC_H +/* One element of kexec actions (last element must have action KEXEC_CALL): */ +struct kexec_action { + enum { + KEXEC_COPY, /* Copy len bytes from src to dest. */ + KEXEC_ZERO, /* Zero len bytes at dest. */ + KEXEC_CALL /* Call dest with paging turned off, param is src. */ + } action; + unsigned int len; + void *dest; + void *src; +}; + +#define KEXEC_MAX_ACTIONS 16 + +extern char _kexec_start[], _kexec_end[]; +extern struct kexec_action kexec_actions[KEXEC_MAX_ACTIONS]; + +int kexec_add_action(int action, void *dest, void *src, unsigned int len); + +#define KEXEC_SECSIZE ((unsigned long)_kexec_end - (unsigned long)_kexec_start) + int kexec(void *kernel, unsigned long kernel_size, const char *cmdline); +/* Initiate final kexec stage. */ +void do_kexec(void *kexec_page); + +/* Assembler code for switching off paging and passing execution to new OS. */ +void kexec_phys(void); + #endif /* _KEXEC_H */ diff --git a/include/x86/os.h b/include/x86/os.h index 0095be13..8a057d81 100644 --- a/include/x86/os.h +++ b/include/x86/os.h @@ -27,6 +27,7 @@ #define MSR_EFER 0xc0000080 #define _EFER_LME 8 /* Long mode enable */ +#define X86_CR0_PE 0x00000001 /* Protected mode enable */ #define X86_CR0_WP 0x00010000 /* Write protect */ #define X86_CR0_PG 0x80000000 /* Paging */ #define X86_CR4_PAE 0x00000020 /* enable physical address extensions */ @@ -64,9 +65,13 @@ #if defined(__i386__) #define __SZ "l" #define __REG "e" +#define ASM_ARG1 "eax" +#define ASM_ARG2 "edx" #else #define __SZ "q" #define __REG "r" +#define ASM_ARG1 "rdi" +#define ASM_ARG2 "rsi" #endif #define ASM_SP __REG"sp" diff --git a/kexec.c b/kexec.c index 7fcc5c6b..b69e145b 100644 --- a/kexec.c +++ b/kexec.c @@ -58,3 +58,25 @@ int kexec(void *kernel, unsigned long kernel_size, const char *cmdline) return ENOSYS; } EXPORT_SYMBOL(kexec); + +struct kexec_action __attribute__((__section__(".data.kexec"))) + kexec_actions[KEXEC_MAX_ACTIONS]; +static unsigned int act_idx; + +int kexec_add_action(int action, void *dest, void *src, unsigned int len) +{ + struct kexec_action *act; + + if ( act_idx == KEXEC_MAX_ACTIONS ) + return -ENOSPC; + + act = kexec_actions + act_idx; + act_idx++; + + act->action = action; + act->len = len; + act->dest = dest; + act->src = src; + + return 0; +} -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Mon Jun 16 08:46:41 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 16 Jun 2025 08:46:41 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1016885.1393876 (Exim 4.92) (envelope-from ) id 1uR5UH-0008JF-B8; Mon, 16 Jun 2025 08:46:41 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1016885.1393876; Mon, 16 Jun 2025 08:46:41 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uR5UH-0008J7-7a; 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dkim=pass header.d=suse.com header.s=susede1 header.b=oUHhG+ib DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750063598; 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=EYprPgKlu2rqJCyxTaoQnR7Oz+a9tTVs4vX0zP9GR4Y=; b=oUHhG+ibSeYEf6fZOIQnq/6IUeGc81v46tTZNBQfSvXGJzLhVWckDEYukjyNmYPomyijUa pS6uHk1GEsum385eSw10TpkHECdNhatrGstiPgfXusxNsn17gp3N6igrKoZ6+ZxOmzYxOG LZO3dypVFQovAW5dB7E24Hd3A9uXpWw= 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 03/12] mini-os: add elf.h Date: Mon, 16 Jun 2025 10:46:10 +0200 Message-ID: <20250616084619.11112-4-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250616084619.11112-1-jgross@suse.com> References: <20250616084619.11112-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-3.01 / 50.00]; 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Only the file header and the program header are needed. The main source for those are elfstructs.h and libelf.h from the Xen tree. The license boiler plate of those files is being kept in the resulting header file. Signed-off-by: Juergen Gross Reviewed-by: Jan Beulich --- V2: - remove some unneeded defines (Jan Beulich) - remove not needed cast (Jan Beulich) --- include/elf.h | 300 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 300 insertions(+) create mode 100644 include/elf.h diff --git a/include/elf.h b/include/elf.h new file mode 100644 index 00000000..fb3cae08 --- /dev/null +++ b/include/elf.h @@ -0,0 +1,300 @@ +#ifndef __ELF_H__ +#define __ELF_H__ +/* + * Copyright (c) 1995, 1996 Erik Theisen. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include +#include + +typedef uint32_t Elf32_Addr; /* Unsigned program address */ +typedef uint32_t Elf32_Off; /* Unsigned file offset */ +typedef uint16_t Elf32_Half; /* Unsigned medium integer */ +typedef uint32_t Elf32_Word; /* Unsigned large integer */ + +typedef uint64_t Elf64_Addr; +typedef uint64_t Elf64_Off; +typedef uint16_t Elf64_Half; +typedef uint32_t Elf64_Word; +typedef uint64_t Elf64_Xword; + +/* Unique build id string format when using --build-id. */ +#define NT_GNU_BUILD_ID 3 + +/* + * e_ident[] identification indexes + * See http://www.caldera.com/developers/gabi/2000-07-17/ch4.eheader.html + */ +#define EI_MAG0 0 /* file ID */ +#define EI_MAG1 1 /* file ID */ +#define EI_MAG2 2 /* file ID */ +#define EI_MAG3 3 /* file ID */ +#define EI_CLASS 4 /* file class */ +#define EI_DATA 5 /* data encoding */ +#define EI_VERSION 6 /* ELF header version */ +#define EI_OSABI 7 /* OS/ABI ID */ +#define EI_ABIVERSION 8 /* ABI version */ +#define EI_PAD 9 /* start of pad bytes */ +#define EI_NIDENT 16 /* Size of e_ident[] */ + +/* e_ident[] magic number */ +#define ELFMAG0 0x7f /* e_ident[EI_MAG0] */ +#define ELFMAG1 'E' /* e_ident[EI_MAG1] */ +#define ELFMAG2 'L' /* e_ident[EI_MAG2] */ +#define ELFMAG3 'F' /* e_ident[EI_MAG3] */ +#define ELFMAG "\177ELF" /* magic */ +#define SELFMAG 4 /* size of magic */ + +/* e_ident[] file class */ +#define ELFCLASSNONE 0 /* invalid */ +#define ELFCLASS32 1 /* 32-bit objs */ +#define ELFCLASS64 2 /* 64-bit objs */ +#define ELFCLASSNUM 3 /* number of classes */ + +/* e_ident[] data encoding */ +#define ELFDATANONE 0 /* invalid */ +#define ELFDATA2LSB 1 /* Little-Endian */ +#define ELFDATA2MSB 2 /* Big-Endian */ +#define ELFDATANUM 3 /* number of data encode defines */ + +/* e_ident */ +#define IS_ELF(ehdr) ((ehdr).e_ident[EI_MAG0] == ELFMAG0 && \ + (ehdr).e_ident[EI_MAG1] == ELFMAG1 && \ + (ehdr).e_ident[EI_MAG2] == ELFMAG2 && \ + (ehdr).e_ident[EI_MAG3] == ELFMAG3) + +/* e_flags */ +#define EF_ARM_EABI_MASK 0xff000000 +#define EF_ARM_EABI_UNKNOWN 0x00000000 +#define EF_ARM_EABI_VER1 0x01000000 +#define EF_ARM_EABI_VER2 0x02000000 +#define EF_ARM_EABI_VER3 0x03000000 +#define EF_ARM_EABI_VER4 0x04000000 +#define EF_ARM_EABI_VER5 0x05000000 + +/* ELF Header */ +typedef struct { + unsigned char e_ident[EI_NIDENT]; /* ELF Identification */ + Elf32_Half e_type; /* object file type */ + Elf32_Half e_machine; /* machine */ + Elf32_Word e_version; /* object file version */ + Elf32_Addr e_entry; /* virtual entry point */ + Elf32_Off e_phoff; /* program header table offset */ + Elf32_Off e_shoff; /* section header table offset */ + Elf32_Word e_flags; /* processor-specific flags */ + Elf32_Half e_ehsize; /* ELF header size */ + Elf32_Half e_phentsize; /* program header entry size */ + Elf32_Half e_phnum; /* number of program header entries */ + Elf32_Half e_shentsize; /* section header entry size */ + Elf32_Half e_shnum; /* number of section header entries */ + Elf32_Half e_shstrndx; /* section header table's "section + header string table" entry offset */ +} Elf32_Ehdr; + +typedef struct { + unsigned char e_ident[EI_NIDENT]; /* Id bytes */ + Elf64_Half e_type; /* file type */ + Elf64_Half e_machine; /* machine type */ + Elf64_Word e_version; /* version number */ + Elf64_Addr e_entry; /* entry point */ + Elf64_Off e_phoff; /* Program hdr offset */ + Elf64_Off e_shoff; /* Section hdr offset */ + Elf64_Word e_flags; /* Processor flags */ + Elf64_Half e_ehsize; /* sizeof ehdr */ + Elf64_Half e_phentsize; /* Program header entry size */ + Elf64_Half e_phnum; /* Number of program headers */ + Elf64_Half e_shentsize; /* Section header entry size */ + Elf64_Half e_shnum; /* Number of section headers */ + Elf64_Half e_shstrndx; /* String table index */ +} Elf64_Ehdr; + +/* e_type */ +#define ET_NONE 0 /* No file type */ +#define ET_REL 1 /* relocatable file */ +#define ET_EXEC 2 /* executable file */ +#define ET_DYN 3 /* shared object file */ +#define ET_CORE 4 /* core file */ +#define ET_NUM 5 /* number of types */ +#define ET_LOPROC 0xff00 /* reserved range for processor */ +#define ET_HIPROC 0xffff /* specific e_type */ + +/* e_machine */ +#define EM_NONE 0 /* No Machine */ +#define EM_386 3 /* Intel 80386 */ +#define EM_PPC64 21 /* PowerPC 64-bit */ +#define EM_ARM 40 /* Advanced RISC Machines ARM */ +#define EM_X86_64 62 /* AMD x86-64 architecture */ +#define EM_AARCH64 183 /* ARM 64-bit */ + +/* Version */ +#define EV_NONE 0 /* Invalid */ +#define EV_CURRENT 1 /* Current */ +#define EV_NUM 2 /* number of versions */ + +/* Program Header */ +typedef struct { + Elf32_Word p_type; /* segment type */ + Elf32_Off p_offset; /* segment offset */ + Elf32_Addr p_vaddr; /* virtual address of segment */ + Elf32_Addr p_paddr; /* physical address - ignored? */ + Elf32_Word p_filesz; /* number of bytes in file for seg. */ + Elf32_Word p_memsz; /* number of bytes in mem. for seg. */ + Elf32_Word p_flags; /* flags */ + Elf32_Word p_align; /* memory alignment */ +} Elf32_Phdr; + +typedef struct { + Elf64_Word p_type; /* entry type */ + Elf64_Word p_flags; /* flags */ + Elf64_Off p_offset; /* offset */ + Elf64_Addr p_vaddr; /* virtual address */ + Elf64_Addr p_paddr; /* physical address */ + Elf64_Xword p_filesz; /* file size */ + Elf64_Xword p_memsz; /* memory size */ + Elf64_Xword p_align; /* memory & file alignment */ +} Elf64_Phdr; + +/* Segment types - p_type */ +#define PT_NULL 0 /* unused */ +#define PT_LOAD 1 /* loadable segment */ +#define PT_DYNAMIC 2 /* dynamic linking section */ +#define PT_INTERP 3 /* the RTLD */ +#define PT_NOTE 4 /* auxiliary information */ +#define PT_SHLIB 5 /* reserved - purpose undefined */ +#define PT_PHDR 6 /* program header */ +#define PT_NUM 7 /* Number of segment types */ +#define PT_LOPROC 0x70000000 /* reserved range for processor */ +#define PT_HIPROC 0x7fffffff /* specific segment types */ + +/* Segment flags - p_flags */ +#define PF_X 0x1 /* Executable */ +#define PF_W 0x2 /* Writable */ +#define PF_R 0x4 /* Readable */ +#define PF_MASKPROC 0xf0000000 /* reserved bits for processor */ + /* specific segment flags */ + +/* Section Header */ +typedef struct { + Elf32_Word sh_name; /* name - index into section header + string table section */ + Elf32_Word sh_type; /* type */ + Elf32_Word sh_flags; /* flags */ + Elf32_Addr sh_addr; /* address */ + Elf32_Off sh_offset; /* file offset */ + Elf32_Word sh_size; /* section size */ + Elf32_Word sh_link; /* section header table index link */ + Elf32_Word sh_info; /* extra information */ + Elf32_Word sh_addralign; /* address alignment */ + Elf32_Word sh_entsize; /* section entry size */ +} Elf32_Shdr; + +typedef struct { + Elf64_Word sh_name; /* section name */ + Elf64_Word sh_type; /* section type */ + Elf64_Xword sh_flags; /* section flags */ + Elf64_Addr sh_addr; /* virtual address */ + Elf64_Off sh_offset; /* file offset */ + Elf64_Xword sh_size; /* section size */ + Elf64_Word sh_link; /* link to another */ + Elf64_Word sh_info; /* misc info */ + Elf64_Xword sh_addralign; /* memory alignment */ + Elf64_Xword sh_entsize; /* table entry size */ +} Elf64_Shdr; + +/* sh_type */ +#define SHT_NULL 0 /* inactive */ +#define SHT_PROGBITS 1 /* program defined information */ +#define SHT_SYMTAB 2 /* symbol table section */ +#define SHT_STRTAB 3 /* string table section */ +#define SHT_RELA 4 /* relocation section with addends*/ +#define SHT_HASH 5 /* symbol hash table section */ +#define SHT_DYNAMIC 6 /* dynamic section */ +#define SHT_NOTE 7 /* note section */ +#define SHT_NOBITS 8 /* no space section */ +#define SHT_REL 9 /* relation section without addends */ +#define SHT_SHLIB 10 /* reserved - purpose unknown */ +#define SHT_DYNSYM 11 /* dynamic symbol table section */ +#define SHT_NUM 12 /* number of section types */ + +/* Note definitions */ +typedef struct { + Elf32_Word namesz; + Elf32_Word descsz; + Elf32_Word type; + char data[]; +} Elf32_Note; + +typedef struct { + Elf64_Word namesz; + Elf64_Word descsz; + Elf64_Word type; + char data[]; +} Elf64_Note; + +/* Abstraction layer for handling 32- and 64-bit ELF files. */ + +typedef union { + Elf32_Ehdr e32; + Elf64_Ehdr e64; +} elf_ehdr; + +static inline bool elf_is_32bit(elf_ehdr *ehdr) +{ + return ehdr->e32.e_ident[EI_CLASS] == ELFCLASS32; +} + +static inline bool elf_is_64bit(elf_ehdr *ehdr) +{ + return ehdr->e32.e_ident[EI_CLASS] == ELFCLASS64; +} + +#define ehdr_val(ehdr, elem) (elf_is_32bit(ehdr) ? (ehdr)->e32.elem : (ehdr)->e64.elem) + +typedef union { + Elf32_Phdr e32; + Elf64_Phdr e64; +} elf_phdr; + +#define phdr_val(ehdr, phdr, elem) (elf_is_32bit(ehdr) ? (phdr)->e32.elem : (phdr)->e64.elem) + +typedef union { + Elf32_Shdr e32; + Elf64_Shdr e64; +} elf_shdr; + +#define shdr_val(ehdr, shdr, elem) (elf_is_32bit(ehdr) ? (shdr)->e32.elem : (shdr)->e64.elem) + +typedef union { + Elf32_Note e32; + Elf64_Note e64; +} elf_note; + +#define note_val(ehdr, note, elem) (elf_is_32bit(ehdr) ? (note)->e32.elem : (note)->e64.elem) + +static inline void *elf_ptr_add(void *ptr, unsigned long add) +{ + return ptr + add; +} +#endif /* __ELF_H__ */ -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Mon Jun 16 08:46:50 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 16 Jun 2025 08:46:50 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1016898.1393909 (Exim 4.92) (envelope-from ) id 1uR5UQ-0000sT-A4; Mon, 16 Jun 2025 08:46:50 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1016898.1393909; Mon, 16 Jun 2025 08:46:50 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uR5UQ-0000sE-6G; Mon, 16 Jun 2025 08:46:50 +0000 Received: by outflank-mailman (input) for mailman id 1016898; Mon, 16 Jun 2025 08:46:49 +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 1uR5UP-0007jR-5p for minios-devel@lists.xenproject.org; Mon, 16 Jun 2025 08:46:49 +0000 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.223.131]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 6e1ca895-4a8e-11f0-a309-13f23c93f187; Mon, 16 Jun 2025 10:46:44 +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 F08491F387; Mon, 16 Jun 2025 08:46:43 +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 BED63139E2; Mon, 16 Jun 2025 08:46:43 +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 oTULLfPZT2gFQAAAD6G6ig (envelope-from ); Mon, 16 Jun 2025 08:46:43 +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: 6e1ca895-4a8e-11f0-a309-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750063604; 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=ErW9+9DRpMiP5o75sVek1KZHEMoGAiJ0VRopG8PxS3M=; b=SWoQN4zlxWLi8ZKq2jWhfuB4yjsy5mSYgvK3YyZ+h+/nexswTQbjMgSPbXt4/KWLwkDezK jvqstgion871pR+Jm9cej3VnHV9VRBGVNo0DSteKAOKFcYurLAVWL8B15KLL5oAq/0IIYD LM+qRQ2xjl51xB4xBIoReu/zkvmuNYw= Authentication-Results: smtp-out2.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750063603; 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=ErW9+9DRpMiP5o75sVek1KZHEMoGAiJ0VRopG8PxS3M=; b=L/kjDblt1jRnE052nkLszKRxliRvJ4gQPpfqz0FQLZXZfJhtE40x+6oOtiAm+V6YsybFOp A+ls5LBf9wwwhM/33nz6IIfMONohLY5zY4/O6UPK1/+ti9+n+DQWaSPTcXb/Pz+kaYYLUZ fbCK8t/iepaP61IcUCpvwV3LV+aTuv8= 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 04/12] mini-os: analyze new kernel for kexec Date: Mon, 16 Jun 2025 10:46:11 +0200 Message-ID: <20250616084619.11112-5-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250616084619.11112-1-jgross@suse.com> References: <20250616084619.11112-1-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%]; 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)[]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; FUZZY_BLOCKED(0.00)[rspamd.com]; 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,imap1.dmz-prg2.suse.org:helo,amd.com:email] X-Spam-Level: X-Spam-Flag: NO X-Spam-Score: -2.80 Analyze the properties of the new kernel to be loaded by kexec. The data needed is: - upper boundary in final location - copy and memory clear operations - entry point and entry parameter Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- V2: - rename check_notes_entry() (Jason Andryuk) - rename kernel_entry to kernel_phys_entry (Jason Andryuk) --- arch/x86/kexec.c | 92 +++++++++++++++++++++++++++++++++++++ include/kexec.h | 11 +++++ kexec.c | 117 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 220 insertions(+) diff --git a/arch/x86/kexec.c b/arch/x86/kexec.c index a8a2fa97..736ca1bf 100644 --- a/arch/x86/kexec.c +++ b/arch/x86/kexec.c @@ -28,8 +28,15 @@ #include #include +#include +#include #include +#include +#include + +static unsigned long kernel_phys_entry = ~0UL; + /* * Final stage of kexec. Copies all data to the final destinations, zeroes * .bss and activates new kernel. @@ -104,4 +111,89 @@ void do_kexec(void *kexec_page) : :"m" (stack), "m" (actions), "m" (phys), "m" (final)); } +bool kexec_chk_arch(elf_ehdr *ehdr) +{ + return ehdr->e32.e_machine == EM_386 || ehdr->e32.e_machine == EM_X86_64; +} + +static unsigned int note_data_sz(unsigned int sz) +{ + return (sz + 3) & ~3; +} + +static void read_note_entry(elf_ehdr *ehdr, void *start, unsigned int len) +{ + elf_note *note = start; + unsigned int off, note_len, namesz, descsz; + char *val; + + for ( off = 0; off < len; off += note_len ) + { + namesz = note_data_sz(note_val(ehdr, note, namesz)); + descsz = note_data_sz(note_val(ehdr, note, descsz)); + val = note_val(ehdr, note, data); + note_len = val - (char *)note + namesz + descsz; + + if ( !strncmp(val, "Xen", namesz) && + note_val(ehdr, note, type) == XEN_ELFNOTE_PHYS32_ENTRY ) + { + val += namesz; + switch ( note_val(ehdr, note, descsz) ) + { + case 1: + kernel_phys_entry = *(uint8_t *)val; + return; + case 2: + kernel_phys_entry = *(uint16_t *)val; + return; + case 4: + kernel_phys_entry = *(uint32_t *)val; + return; + case 8: + kernel_phys_entry = *(uint64_t *)val; + return; + default: + break; + } + } + + note = elf_ptr_add(note, note_len); + } +} + +int kexec_arch_analyze_phdr(elf_ehdr *ehdr, elf_phdr *phdr) +{ + void *notes_start; + unsigned int notes_len; + + if ( phdr_val(ehdr, phdr, p_type) != PT_NOTE || kernel_phys_entry != ~0UL ) + return 0; + + notes_start = elf_ptr_add(ehdr, phdr_val(ehdr, phdr, p_offset)); + notes_len = phdr_val(ehdr, phdr, p_filesz); + read_note_entry(ehdr, notes_start, notes_len); + + return 0; +} + +int kexec_arch_analyze_shdr(elf_ehdr *ehdr, elf_shdr *shdr) +{ + void *notes_start; + unsigned int notes_len; + + if ( shdr_val(ehdr, shdr, sh_type) != SHT_NOTE || + kernel_phys_entry != ~0UL ) + return 0; + + notes_start = elf_ptr_add(ehdr, shdr_val(ehdr, shdr, sh_offset)); + notes_len = shdr_val(ehdr, shdr, sh_size); + read_note_entry(ehdr, notes_start, notes_len); + + return 0; +} + +bool kexec_arch_need_analyze_shdrs(void) +{ + return kernel_phys_entry == ~0UL; +} #endif /* CONFIG_KEXEC */ diff --git a/include/kexec.h b/include/kexec.h index 722be456..f54cbb90 100644 --- a/include/kexec.h +++ b/include/kexec.h @@ -1,5 +1,6 @@ #ifndef _KEXEC_H #define _KEXEC_H +#include /* One element of kexec actions (last element must have action KEXEC_CALL): */ struct kexec_action { @@ -18,6 +19,8 @@ struct kexec_action { extern char _kexec_start[], _kexec_end[]; extern struct kexec_action kexec_actions[KEXEC_MAX_ACTIONS]; +extern unsigned long kexec_last_addr; + int kexec_add_action(int action, void *dest, void *src, unsigned int len); #define KEXEC_SECSIZE ((unsigned long)_kexec_end - (unsigned long)_kexec_start) @@ -31,4 +34,12 @@ void do_kexec(void *kexec_page); /* Assembler code for switching off paging and passing execution to new OS. */ void kexec_phys(void); +/* Check kernel to match current architecture. */ +bool kexec_chk_arch(elf_ehdr *ehdr); + +/* Architecture specific ELF handling functions. */ +int kexec_arch_analyze_phdr(elf_ehdr *ehdr, elf_phdr *phdr); +int kexec_arch_analyze_shdr(elf_ehdr *ehdr, elf_shdr *shdr); +bool kexec_arch_need_analyze_shdrs(void); + #endif /* _KEXEC_H */ diff --git a/kexec.c b/kexec.c index b69e145b..7c0e6377 100644 --- a/kexec.c +++ b/kexec.c @@ -31,6 +31,9 @@ #include #include #include +#include +#include +#include #include /* @@ -53,8 +56,122 @@ * - The new kernel is activated. */ +unsigned long kexec_last_addr; + +static int analyze_phdrs(elf_ehdr *ehdr) +{ + elf_phdr *phdr; + unsigned int n_hdr, i; + unsigned long paddr, offset, filesz, memsz; + int ret; + + phdr = elf_ptr_add(ehdr, ehdr_val(ehdr, e_phoff)); + n_hdr = ehdr_val(ehdr, e_phnum); + for ( i = 0; i < n_hdr; i++ ) + { + ret = kexec_arch_analyze_phdr(ehdr, phdr); + if ( ret ) + return ret; + + if ( phdr_val(ehdr, phdr, p_type) == PT_LOAD && + (phdr_val(ehdr, phdr, p_flags) & (PF_X | PF_W | PF_R)) ) + { + paddr = phdr_val(ehdr, phdr, p_paddr); + offset = phdr_val(ehdr, phdr, p_offset); + filesz = phdr_val(ehdr, phdr, p_filesz); + memsz = phdr_val(ehdr, phdr, p_memsz); + if ( filesz > 0 ) + { + ret = kexec_add_action(KEXEC_COPY, to_virt(paddr), + (char *)ehdr + offset, filesz); + if ( ret ) + return ret; + } + if ( memsz > filesz ) + { + ret = kexec_add_action(KEXEC_ZERO, to_virt(paddr + filesz), + NULL, memsz - filesz); + if ( ret ) + return ret; + } + if ( paddr + memsz > kexec_last_addr ) + kexec_last_addr = paddr + memsz; + } + + phdr = elf_ptr_add(phdr, ehdr_val(ehdr, e_phentsize)); + } + + return 0; +} + +static int analyze_shdrs(elf_ehdr *ehdr) +{ + elf_shdr *shdr; + unsigned int n_hdr, i; + int ret; + + if ( !kexec_arch_need_analyze_shdrs() ) + return 0; + + shdr = elf_ptr_add(ehdr, ehdr_val(ehdr, e_shoff)); + n_hdr = ehdr_val(ehdr, e_shnum); + for ( i = 0; i < n_hdr; i++ ) + { + ret = kexec_arch_analyze_shdr(ehdr, shdr); + if ( ret ) + return ret; + + shdr = elf_ptr_add(shdr, ehdr_val(ehdr, e_shentsize)); + } + + return 0; +} + +static int analyze_kernel(void *kernel, unsigned long size) +{ + elf_ehdr *ehdr = kernel; + int ret; + + if ( !IS_ELF(ehdr->e32) ) + { + printk("kexec: new kernel not an ELF file\n"); + return ENOEXEC; + } + if ( ehdr->e32.e_ident[EI_DATA] != ELFDATA2LSB ) + { + printk("kexec: ELF file of new kernel is big endian\n"); + return ENOEXEC; + } + if ( !elf_is_32bit(ehdr) && !elf_is_64bit(ehdr) ) + { + printk("kexec: ELF file of new kernel is neither 32 nor 64 bit\n"); + return ENOEXEC; + } + if ( !kexec_chk_arch(ehdr) ) + { + printk("kexec: ELF file of new kernel is not compatible with arch\n"); + return ENOEXEC; + } + + ret = analyze_phdrs(ehdr); + if ( ret ) + return ret; + + ret = analyze_shdrs(ehdr); + if ( ret ) + return ret; + + return 0; +} + int kexec(void *kernel, unsigned long kernel_size, const char *cmdline) { + int ret; + + ret = analyze_kernel(kernel, kernel_size); + if ( ret ) + return ret; + return ENOSYS; } EXPORT_SYMBOL(kexec); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Mon Jun 16 08:46:53 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 16 Jun 2025 08:46:53 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1016903.1393913 (Exim 4.92) (envelope-from ) id 1uR5UT-00013n-CL; 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bh=Har4IwtPYyYJZu4D6gPZgpdZMuGaRz2PoPDisbs0FwU=; b=R83igbw1tj3VZ1xHwp86+zoOf0BMddI5D3JZHdZeQTL9irr1tyP2PmLv+pjUfRSF/FhnSE U1w7DJTaaiZJCk1CKBQYvYrzGDVxz/Ij32KRmJWHwvGtDa7lxZVHloBAatywys8KVMCzES hRF8oHhdtnxhXPX64tfCoFA/+9Ul5n0= Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750063609; 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=Har4IwtPYyYJZu4D6gPZgpdZMuGaRz2PoPDisbs0FwU=; b=R83igbw1tj3VZ1xHwp86+zoOf0BMddI5D3JZHdZeQTL9irr1tyP2PmLv+pjUfRSF/FhnSE U1w7DJTaaiZJCk1CKBQYvYrzGDVxz/Ij32KRmJWHwvGtDa7lxZVHloBAatywys8KVMCzES hRF8oHhdtnxhXPX64tfCoFA/+9Ul5n0= 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 05/12] mini-os: kexec: finalize parameter location and size Date: Mon, 16 Jun 2025 10:46:12 +0200 Message-ID: <20250616084619.11112-6-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250616084619.11112-1-jgross@suse.com> References: <20250616084619.11112-1-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_FIVE(0.00)[5]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[amd.com:email,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 Finalize the location and the size of the parameters for the new kernel. This is needed in order to avoid allocating new memory in the area occupied by the new kernel and parameters. Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- arch/x86/kexec.c | 15 +++++++++++++++ include/kexec.h | 3 +++ kexec.c | 2 ++ 3 files changed, 20 insertions(+) diff --git a/arch/x86/kexec.c b/arch/x86/kexec.c index 736ca1bf..47830905 100644 --- a/arch/x86/kexec.c +++ b/arch/x86/kexec.c @@ -196,4 +196,19 @@ bool kexec_arch_need_analyze_shdrs(void) { return kernel_phys_entry == ~0UL; } + +static unsigned long kexec_param_loc; +static unsigned int kexec_param_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); + kexec_param_size += strlen(cmdline) + 1; + + kexec_last_addr = (kexec_last_addr + 7) & ~7UL; + kexec_param_loc = kexec_last_addr; + kexec_last_addr += kexec_param_size; + kexec_last_addr = round_pgup(kexec_last_addr); +} #endif /* CONFIG_KEXEC */ diff --git a/include/kexec.h b/include/kexec.h index f54cbb90..8a2b552f 100644 --- a/include/kexec.h +++ b/include/kexec.h @@ -42,4 +42,7 @@ int kexec_arch_analyze_phdr(elf_ehdr *ehdr, elf_phdr *phdr); int kexec_arch_analyze_shdr(elf_ehdr *ehdr, elf_shdr *shdr); bool kexec_arch_need_analyze_shdrs(void); +/* Finalize parameter location and size. */ +void kexec_set_param_loc(const char *cmdline); + #endif /* _KEXEC_H */ diff --git a/kexec.c b/kexec.c index 7c0e6377..31839382 100644 --- a/kexec.c +++ b/kexec.c @@ -172,6 +172,8 @@ int kexec(void *kernel, unsigned long kernel_size, const char *cmdline) if ( ret ) return ret; + kexec_set_param_loc(cmdline); + return ENOSYS; } EXPORT_SYMBOL(kexec); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Mon Jun 16 08:50:47 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 16 Jun 2025 08:50:47 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1016947.1393957 (Exim 4.92) (envelope-from ) id 1uR5YC-0004Ym-Vp; Mon, 16 Jun 2025 08:50:44 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1016947.1393957; Mon, 16 Jun 2025 08:50:44 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uR5YC-0004Y6-Rq; 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dkim=pass header.d=suse.com header.s=susede1 header.b=F86He+TT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750063632; 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=PH+wEmmUZQaMniHgWmRo2+UM2z0RSGbsNqftNFMeuQo=; b=F86He+TTVrGS+5vuLSTsGyJlyDfbSDa2RjExEiUHJJVgeHR/0gNLAlWNdO94q/vQdZu95C YUUKnoK5lVD5tj9tj5TztJtAVntuujCirxRsmCiRo/3mmgP66lVjufKJe+y0i7/Q9Tp9gW keaScFbi1Mvlij0y3jhG7E+beTdJjv0= 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 09/12] Mini-OS: mm: change set_readonly() to change_readonly() Date: Mon, 16 Jun 2025 10:46:16 +0200 Message-ID: <20250616084619.11112-10-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250616084619.11112-1-jgross@suse.com> References: <20250616084619.11112-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-3.01 / 50.00]; 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At the same time move the boundary setting from the only caller into the function itself, avoiding the need to use the same boundaries in future, when it will be called to set the kernel to writable again. Make the function globally visible in order to allow calling it from kexec coding later. Merge clear_bootstrap() into change_readonly() and undo its setting of page 0 to invalid when setting the kernel writable. Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- arch/x86/mm.c | 111 +++++++++++++++++++++++++++----------------------- include/mm.h | 3 ++ 2 files changed, 64 insertions(+), 50 deletions(-) diff --git a/arch/x86/mm.c b/arch/x86/mm.c index a71eb192..f4419d95 100644 --- a/arch/x86/mm.c +++ b/arch/x86/mm.c @@ -405,17 +405,19 @@ static void build_pagetable(unsigned long *start_pfn, unsigned long *max_pfn) */ extern struct shared_info shared_info; -struct set_readonly_par { +struct change_readonly_par { unsigned long etext; #ifdef CONFIG_PARAVIRT unsigned int count; #endif + bool readonly; }; -static int set_readonly_func(unsigned long va, unsigned int lvl, bool is_leaf, - pgentry_t *pte, void *par) +static int change_readonly_func(unsigned long va, unsigned int lvl, + bool is_leaf, pgentry_t *pte, void *par) { - struct set_readonly_par *ro = par; + struct change_readonly_par *ro = par; + pgentry_t newval; if ( !is_leaf ) return 0; @@ -429,9 +431,11 @@ static int set_readonly_func(unsigned long va, unsigned int lvl, bool is_leaf, return 0; } + newval = ro->readonly ? (*pte & ~_PAGE_RW) : (*pte | _PAGE_RW); + #ifdef CONFIG_PARAVIRT mmu_updates[ro->count].ptr = virt_to_mach(pte); - mmu_updates[ro->count].val = *pte & ~_PAGE_RW; + mmu_updates[ro->count].val = newval; ro->count++; if ( ro->count == L1_PAGETABLE_ENTRIES ) @@ -442,7 +446,7 @@ static int set_readonly_func(unsigned long va, unsigned int lvl, bool is_leaf, ro->count = 0; } #else - *pte &= ~_PAGE_RW; + *pte = newval; #endif return 0; @@ -463,23 +467,6 @@ static void tlb_flush(void) } #endif -static void set_readonly(void *text, void *etext) -{ - struct set_readonly_par setro = { .etext = (unsigned long)etext }; - unsigned long start_address = PAGE_ALIGN((unsigned long)text); - - printk("setting %p-%p readonly\n", text, etext); - walk_pt(start_address, setro.etext, set_readonly_func, &setro); - -#ifdef CONFIG_PARAVIRT - if ( setro.count && - HYPERVISOR_mmu_update(mmu_updates, setro.count, NULL, DOMID_SELF) < 0) - BUG(); -#endif - - tlb_flush(); -} - /* * get the PTE for virtual address va if it exists. Otherwise NULL. */ @@ -508,6 +495,51 @@ static pgentry_t *get_pgt(unsigned long va) return tab; } +void change_readonly(bool readonly) +{ + struct change_readonly_par ro = { + .etext = (unsigned long)&_erodata, + .readonly = readonly, + }; + unsigned long start_address = PAGE_ALIGN((unsigned long)&_text); +#ifdef CONFIG_PARAVIRT + pte_t nullpte = { }; + int rc; +#else + pgentry_t *pgt = get_pgt((unsigned long)&_text); +#endif + + if ( readonly ) + { +#ifdef CONFIG_PARAVIRT + if ( (rc = HYPERVISOR_update_va_mapping(0, nullpte, UVMF_INVLPG)) ) + printk("Unable to unmap NULL page. rc=%d\n", rc); +#else + *pgt = 0; + invlpg((unsigned long)&_text); +#endif + } + else + { +#ifdef CONFIG_PARAVIRT + /* No kexec support with PARAVIRT. */ + BUG(); +#else + *pgt = L1_PROT; +#endif + } + + printk("setting %p-%p readonly\n", &_text, &_erodata); + walk_pt(start_address, ro.etext, change_readonly_func, &ro); + +#ifdef CONFIG_PARAVIRT + if ( ro.count && + HYPERVISOR_mmu_update(mmu_updates, ro.count, NULL, DOMID_SELF) < 0) + BUG(); +#endif + + tlb_flush(); +} /* * return a valid PTE for a given virtual address. If PTE does not exist, @@ -789,31 +821,6 @@ int unmap_frames(unsigned long va, unsigned long num_frames) } EXPORT_SYMBOL(unmap_frames); -/* - * Clear some of the bootstrap memory - */ -static void clear_bootstrap(void) -{ -#ifdef CONFIG_PARAVIRT - pte_t nullpte = { }; - int rc; -#else - pgentry_t *pgt; -#endif - - /* Use first page as the CoW zero page */ - memset(&_text, 0, PAGE_SIZE); - mfn_zero = virt_to_mfn((unsigned long) &_text); -#ifdef CONFIG_PARAVIRT - if ( (rc = HYPERVISOR_update_va_mapping(0, nullpte, UVMF_INVLPG)) ) - printk("Unable to unmap NULL page. rc=%d\n", rc); -#else - pgt = get_pgt((unsigned long)&_text); - *pgt = 0; - invlpg((unsigned long)&_text); -#endif -} - #ifdef CONFIG_PARAVIRT void p2m_chk_pfn(unsigned long pfn) { @@ -884,8 +891,12 @@ void arch_init_mm(unsigned long* start_pfn_p, unsigned long* max_pfn_p) printk(" max_pfn: %lx\n", max_pfn); build_pagetable(&start_pfn, &max_pfn); - clear_bootstrap(); - set_readonly(&_text, &_erodata); + + /* Prepare page 0 as CoW page. */ + memset(&_text, 0, PAGE_SIZE); + mfn_zero = virt_to_mfn((unsigned long)&_text); + + change_readonly(true); *start_pfn_p = start_pfn; *max_pfn_p = max_pfn; diff --git a/include/mm.h b/include/mm.h index 5775c3e1..0a16d56c 100644 --- a/include/mm.h +++ b/include/mm.h @@ -25,6 +25,7 @@ #ifndef _MM_H_ #define _MM_H_ +#include #if defined(__i386__) #include #elif defined(__x86_64__) @@ -92,4 +93,6 @@ extern unsigned long heap, brk, heap_mapped, heap_end; int free_physical_pages(xen_pfn_t *mfns, int n); void fini_mm(void); +void change_readonly(bool readonly); + #endif /* _MM_H_ */ -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Mon Jun 16 08:50:47 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 16 Jun 2025 08:50:47 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1016952.1393961 (Exim 4.92) (envelope-from ) id 1uR5YF-0004jF-0u; Mon, 16 Jun 2025 08:50:47 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1016952.1393961; 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bh=t6vErAErnWD/FpLTzRhfE8JqNkLUXRMZRtPqHFEP1P8=; b=PHX2IwrcZ/YS5hTfN4yhU5/SXV3c3swS8eEhIhSMQZqnhRtqk9mZy8zfw2KirRigVGNjG+ 8wFtDb/QDlCghYPtOOd9KgwCx1CoXsPR214SgBevfEnowA9fHu+tVL2of+br5uMXGjlWTa H3aP2zAp1uGsrnSpfq0FFBfNApMf4Fo= Authentication-Results: smtp-out2.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750063615; 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=t6vErAErnWD/FpLTzRhfE8JqNkLUXRMZRtPqHFEP1P8=; b=PHX2IwrcZ/YS5hTfN4yhU5/SXV3c3swS8eEhIhSMQZqnhRtqk9mZy8zfw2KirRigVGNjG+ 8wFtDb/QDlCghYPtOOd9KgwCx1CoXsPR214SgBevfEnowA9fHu+tVL2of+br5uMXGjlWTa H3aP2zAp1uGsrnSpfq0FFBfNApMf4Fo= 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 06/12] mini-os: reserve memory below boundary Date: Mon, 16 Jun 2025 10:46:13 +0200 Message-ID: <20250616084619.11112-7-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250616084619.11112-1-jgross@suse.com> References: <20250616084619.11112-1-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%]; 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)[]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; FUZZY_BLOCKED(0.00)[rspamd.com]; 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-Level: X-Spam-Flag: NO X-Spam-Score: -2.80 In order to support kexec any memory used during copying the new kernel to its final destination must not overlap with the destination area. In order to achieve that add a new interface allowing to mark all allocatable memory below a specific physical address as not available. This is done by walking through all chunks of the buddy allocator and removing the chunks (or chunk parts) below the boundary. The removed chunks are put into a list in order to be able to undo the operation in case kexec is failing before doing any unrecoverable system modifications. Any pages freed located below the boundary need to go directly into the list of reserved pages instead of the free pool. Call the new function from kexec code. Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- include/mm.h | 5 +++ kexec.c | 5 +++ mm.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++++++- 3 files changed, 98 insertions(+), 1 deletion(-) diff --git a/include/mm.h b/include/mm.h index 4fc364ff..5775c3e1 100644 --- a/include/mm.h +++ b/include/mm.h @@ -57,6 +57,11 @@ unsigned long alloc_pages(int order); void free_pages(void *pointer, int order); #define free_page(p) free_pages(p, 0) +#ifdef CONFIG_KEXEC +void reserve_memory_below(unsigned long boundary); +void unreserve_memory_below(void); +#endif + static __inline__ int get_order(unsigned long size) { int order; diff --git a/kexec.c b/kexec.c index 31839382..1a90d8ab 100644 --- a/kexec.c +++ b/kexec.c @@ -174,6 +174,11 @@ int kexec(void *kernel, unsigned long kernel_size, const char *cmdline) kexec_set_param_loc(cmdline); + reserve_memory_below(kexec_last_addr); + + /* Error exit. */ + unreserve_memory_below(); + return ENOSYS; } EXPORT_SYMBOL(kexec); diff --git a/mm.c b/mm.c index a5d3f5e5..9236db58 100644 --- a/mm.c +++ b/mm.c @@ -230,6 +230,84 @@ static void init_page_allocator(unsigned long min, unsigned long max) mm_alloc_bitmap_remap(); } +#ifdef CONFIG_KEXEC +static chunk_head_t *reserved_chunks; +static unsigned long boundary_pfn; + +static void free_pages_below(void *pointer, unsigned int order) +{ + unsigned long pfn_s, pfn; + chunk_head_t *ch = pointer; + + pfn_s = virt_to_pfn(ch); + + if ( pfn_s + (1UL << order) <= boundary_pfn ) + { + /* Put complete chunk into reserved list. */ + ch->level = order; + ch->next = reserved_chunks; + reserved_chunks = ch; + } + else + { + /* Put pages below boundary into reserved list. */ + for ( pfn = pfn_s; pfn < boundary_pfn; pfn++ ) + { + chunk_head_t *ch_res = pfn_to_virt(pfn); + + ch_res->level = 0; + ch_res->next = reserved_chunks; + reserved_chunks = ch_res; + } + + /* Return pages above boundary to free pool again. */ + for ( ; pfn < pfn_s + (1UL << order); pfn++ ) + free_pages(pfn_to_virt(pfn), 0); + } +} + +void reserve_memory_below(unsigned long boundary) +{ + unsigned long pfn; + unsigned int order; + chunk_head_t *ch; + + ASSERT(!boundary_pfn); + boundary_pfn = PHYS_PFN(boundary); + + for ( order = 0; order < FREELIST_SIZE; order++ ) + { + for ( ch = free_list[order].next; !FREELIST_EMPTY(ch); ch = ch->next ) + { + pfn = virt_to_pfn(ch); + if ( pfn >= boundary_pfn ) + continue; + + /* Dequeue from this level, at least parts will be reserved. */ + dequeue_elem(ch); + /* Mark all as allocated, pieces above boundary will be returned. */ + map_alloc(pfn, 1UL << ch->level); + + free_pages_below(ch, ch->level); + } + } +} + +void unreserve_memory_below(void) +{ + chunk_head_t *ch; + + boundary_pfn = 0; + + while ( reserved_chunks ) + { + ch = reserved_chunks; + reserved_chunks = ch->next; + free_pages(ch, ch->level); + } +} +#endif /* CONFIG_KEXEC */ + /* Allocate 2^@order contiguous pages. Returns a VIRTUAL address. */ unsigned long alloc_pages(int order) { @@ -279,10 +357,19 @@ EXPORT_SYMBOL(alloc_pages); void free_pages(void *pointer, int order) { chunk_head_t *freed_ch, *to_merge_ch; + unsigned long pfn = virt_to_pfn(pointer); unsigned long mask; +#ifdef CONFIG_KEXEC + if ( pfn < boundary_pfn ) + { + free_pages_below(pointer, order); + return; + } +#endif + /* First free the chunk */ - map_free(virt_to_pfn(pointer), 1UL << order); + map_free(pfn, 1UL << order); /* Create free chunk */ freed_ch = (chunk_head_t *)pointer; -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Mon Jun 16 08:50:47 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 16 Jun 2025 08:50:47 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1016956.1393975 (Exim 4.92) (envelope-from ) id 1uR5YF-0004rS-Un; Mon, 16 Jun 2025 08:50:47 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1016956.1393975; 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bh=9oEFTpU9aU3slJF04hBQYd4aVGaCv7knMZrTTup/bd0=; b=sheYdGj3pN/vC/Rmbq1lGWAmA2IZKgGLUu21+LihgsnyaOqBqkqlcef+YPpQOyq9qBTq7L NrPP5vKsYlPjyqVBpOYgFHhD2Up59/C+xiOJuB+8KsrQVU82c6aoS6iKL+MssAIV3z9uty iyautI2uJP/Yk0cXjsJbJSspA9XiWsw= Authentication-Results: smtp-out2.suse.de; dkim=pass header.d=suse.com header.s=susede1 header.b=oY+0NaNR DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750063637; 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=9oEFTpU9aU3slJF04hBQYd4aVGaCv7knMZrTTup/bd0=; b=oY+0NaNR88YKEezyZT76ajQXIDV6E/w9gQmjqDAGaSEp+OI27LwPkMzRPFnCt2NOmklteT LNdGLs2sHtlW2IduhOupmr47jHWggPSzL1iN0NOYKkuFQXzU7euxBNVgUa35m9b63vV3cx Qp3e2ZqoEmOBFzN0sH79WGnM9zETq3s= 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 10/12] Mini-OS: kexec: switch read-only area to be writable again Date: Mon, 16 Jun 2025 10:46:17 +0200 Message-ID: <20250616084619.11112-11-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250616084619.11112-1-jgross@suse.com> References: <20250616084619.11112-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Queue-Id: B273A1F38F X-Rspamd-Action: no action X-Spam-Flag: NO X-Spamd-Result: default: False [-3.01 / 50.00]; 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Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- V2: - modify printk() statement (Jason Andryuk) --- arch/x86/mm.c | 3 ++- kexec.c | 3 +++ 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/x86/mm.c b/arch/x86/mm.c index f4419d95..26ede6f4 100644 --- a/arch/x86/mm.c +++ b/arch/x86/mm.c @@ -529,7 +529,8 @@ void change_readonly(bool readonly) #endif } - printk("setting %p-%p readonly\n", &_text, &_erodata); + printk("setting %p-%p %s\n", &_text, &_erodata, + readonly ? "readonly" : "writable"); walk_pt(start_address, ro.etext, change_readonly_func, &ro); #ifdef CONFIG_PARAVIRT diff --git a/kexec.c b/kexec.c index 3b11a69c..1ef7ce84 100644 --- a/kexec.c +++ b/kexec.c @@ -183,6 +183,8 @@ int kexec(void *kernel, unsigned long kernel_size, const char *cmdline) goto err; } + change_readonly(false); + ret = kexec_move_used_pages(kexec_last_addr, (unsigned long)kernel, kernel_size); if ( ret ) @@ -192,6 +194,7 @@ int kexec(void *kernel, unsigned long kernel_size, const char *cmdline) ret = ENOSYS; err: + change_readonly(true); unreserve_memory_below(); kexec_move_used_pages_undo(); kexec_get_entry_undo(); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Mon Jun 16 08:50:48 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 16 Jun 2025 08:50:48 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1016959.1393976 (Exim 4.92) (envelope-from ) id 1uR5YF-0004sV-Uw; Mon, 16 Jun 2025 08:50:47 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1016959.1393976; 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bh=IMg43rEyz8CpFoVtq3k2oUri4d2hHuQbI9tlZdtJd1M=; b=RBycZqlgyhvjGURyBTEl+DgB6nQGhh31WKaVV+yTp1sAXttmg+yIRZ9ukSzGsZKHBoj0ij REk5qSbSMn7B/V/WkDfZJFZwpnGhvZxP0e6Vbm47m2+M3bB7WOMiJsEb42h7Vi8uUtIAfe XGe7W1XKAgxDD1/uhmOBMfx6dd+ohfU= Authentication-Results: smtp-out1.suse.de; dkim=pass header.d=suse.com header.s=susede1 header.b=dYaRylJK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750063648; 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=IMg43rEyz8CpFoVtq3k2oUri4d2hHuQbI9tlZdtJd1M=; b=dYaRylJK0V/t4bUa7GTifIuxYGsBu9t85xuZtG1CaUoZoxuvd5an6xk4mHpO7Mnz3VLPp3 lyGpE1QHPLGkpJK7gIO0bQMrQee+GDMqR2JZL5rY7NJNs4DjFes4i3UVl51VExF0k8KaBk b9hndnRcm56g6Zm+Zo6APRP/RHPKP4k= 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 12/12] mini-os: kexec: do the final kexec step Date: Mon, 16 Jun 2025 10:46:19 +0200 Message-ID: <20250616084619.11112-13-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250616084619.11112-1-jgross@suse.com> References: <20250616084619.11112-1-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 --- kexec.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/kexec.c b/kexec.c index f42aa8ad..2607c819 100644 --- a/kexec.c +++ b/kexec.c @@ -168,6 +168,7 @@ int kexec(void *kernel, unsigned long kernel_size, const char *cmdline) { int ret; unsigned long *func; + void *kexec_page; ret = analyze_kernel(kernel, kernel_size); if ( ret ) @@ -191,6 +192,13 @@ int kexec(void *kernel, unsigned long kernel_size, const char *cmdline) if ( ret ) goto err; + kexec_page = (void *)alloc_page(); + if ( !kexec_page ) + { + ret = ENOMEM; + goto err; + } + for ( func = __kexec_array_start; func < __kexec_array_end; func++ ) { ret = ((kexeccall_t)(*func))(false); @@ -203,10 +211,15 @@ int kexec(void *kernel, unsigned long kernel_size, const char *cmdline) } } - /* Error exit. */ - ret = ENOSYS; + /* Activate the new kernel. */ + do_kexec(kexec_page); + + /* do_kexec() shouldn't return, crash. */ + BUG(); err: + if ( kexec_page ) + free_page(kexec_page); change_readonly(true); unreserve_memory_below(); kexec_move_used_pages_undo(); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Mon Jun 16 08:50:51 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 16 Jun 2025 08:50:51 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1016968.1393984 (Exim 4.92) (envelope-from ) id 1uR5YI-0005Dm-VT; Mon, 16 Jun 2025 08:50:50 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1016968.1393984; Mon, 16 Jun 2025 08:50:50 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uR5YI-0005DO-NF; Mon, 16 Jun 2025 08:50:50 +0000 Received: by outflank-mailman (input) for mailman id 1016968; Mon, 16 Jun 2025 08:50:49 +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 1uR5Ui-0007jR-Ey for minios-devel@lists.xenproject.org; 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Mon, 16 Jun 2025 08:47:06 +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: 7b9987ef-4a8e-11f0-a309-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750063626; 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=gNbWUmZdTVJqcXlU2fjp4XsMXe38emePLWQ2ppavBkA=; b=tls3nwVCrtCHQR59uMJcXlRMhSzYdIzt6nLDRUrn5+RcFk84twmAK068pfugW7FkGASKel omvkvRx7Ez7ZPUfB9awNnuzVEX00E9WvgLBp1SaJgt9kdeBwIr8QLdStc5veO8tRuo3SzN HJza56kLAE3SyO3bGwPWHlve/xxoPXc= Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750063626; 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=gNbWUmZdTVJqcXlU2fjp4XsMXe38emePLWQ2ppavBkA=; b=tls3nwVCrtCHQR59uMJcXlRMhSzYdIzt6nLDRUrn5+RcFk84twmAK068pfugW7FkGASKel omvkvRx7Ez7ZPUfB9awNnuzVEX00E9WvgLBp1SaJgt9kdeBwIr8QLdStc5veO8tRuo3SzN HJza56kLAE3SyO3bGwPWHlve/xxoPXc= 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 08/12] mini-os: kexec: move used pages away for new kernel Date: Mon, 16 Jun 2025 10:46:15 +0200 Message-ID: <20250616084619.11112-9-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250616084619.11112-1-jgross@suse.com> References: <20250616084619.11112-1-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%]; 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)[]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; FUZZY_BLOCKED(0.00)[rspamd.com]; 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,imap1.dmz-prg2.suse.org:helo,amd.com:email] X-Spam-Level: X-Spam-Flag: NO X-Spam-Score: -2.80 Copying the new kexec kernel must not overwrite any pages still needed during this process. Those are especially the GDT, IDT and page tables. Move those to new allocated pages and update any related pointers. In case the kexec process is cancelled later, don't undo any page table moves, as the system can just be used with the new layout. By freeing the original pages there is no memory leaking. GDT and IDT should be reverted to their original locations, as their original memory can't be freed due to not being whole pages. Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- arch/x86/mm.c | 126 ++++++++++++++++++++++++++++++++++++++++++++++++ include/kexec.h | 5 ++ kexec.c | 6 +++ 3 files changed, 137 insertions(+) diff --git a/arch/x86/mm.c b/arch/x86/mm.c index 3ba6d917..a71eb192 100644 --- a/arch/x86/mm.c +++ b/arch/x86/mm.c @@ -42,6 +42,7 @@ #include #include #include +#include #include #include #include @@ -923,3 +924,128 @@ unsigned long map_frame_virt(unsigned long mfn) return addr; } EXPORT_SYMBOL(map_frame_virt); + +#ifdef CONFIG_KEXEC +static unsigned long kexec_gdt; +static unsigned long kexec_idt; + +static int move_pt(unsigned long va, unsigned int lvl, bool is_leaf, + pgentry_t *pte, void *par) +{ + unsigned long boundary_pfn = *(unsigned long *)par; + unsigned long pfn; + void *old_pg, *new_pg; + + if ( is_leaf ) + return 0; + + pfn = (lvl == PAGETABLE_LEVELS + 1) ? PHYS_PFN(*(unsigned long *)pte) + : pte_to_mfn(*pte); + if ( pfn >= boundary_pfn ) + return 0; + + new_pg = (void *)alloc_page(); + if ( !new_pg ) + return ENOMEM; + old_pg = pfn_to_virt(pfn); + memcpy(new_pg, old_pg, PAGE_SIZE); + if ( lvl == PAGETABLE_LEVELS + 1 ) + *(pgentry_t **)pte = new_pg; + else + *pte = ((unsigned long)new_pg & PAGE_MASK) | ptdata[lvl].prot; + + tlb_flush(); + + free_page(old_pg); + + return 0; +} + +static int move_leaf(unsigned long va, unsigned int lvl, bool is_leaf, + pgentry_t *pte, void *par) +{ + unsigned long boundary_pfn = *(unsigned long *)par; + unsigned long pfn; + void *old_pg, *new_pg; + + if ( !is_leaf ) + return 0; + + /* No large page support, all pages must be valid. */ + if ( (*pte & _PAGE_PSE) || !(*pte & _PAGE_PRESENT) ) + return EINVAL; + + pfn = pte_to_mfn(*pte); + if ( pfn >= boundary_pfn ) + return 0; + + new_pg = (void *)alloc_page(); + if ( !new_pg ) + return ENOMEM; + old_pg = pfn_to_virt(pfn); + memcpy(new_pg, old_pg, PAGE_SIZE); + *pte = ((unsigned long)new_pg & PAGE_MASK) | ptdata[lvl].prot; + + invlpg(va); + + free_page(old_pg); + + return 0; +} + +int kexec_move_used_pages(unsigned long boundary, unsigned long kernel, + unsigned long kernel_size) +{ + int ret; + unsigned long boundary_pfn = PHYS_PFN(boundary); + + kexec_gdt = alloc_page(); + if ( !kexec_gdt ) + return ENOMEM; + memcpy((char *)kexec_gdt, &gdt, sizeof(gdt)); + gdt_ptr.base = kexec_gdt; + asm volatile("lgdt %0" : : "m" (gdt_ptr)); + + kexec_idt = alloc_page(); + if ( !kexec_idt ) + return ENOMEM; + memcpy((char *)kexec_idt, &idt, sizeof(idt)); + idt_ptr.base = kexec_idt; + asm volatile("lidt %0" : : "m" (idt_ptr)); + + /* Top level page table needs special handling. */ + ret = move_pt(0, PAGETABLE_LEVELS + 1, false, (pgentry_t *)(&pt_base), + &boundary_pfn); + if ( ret ) + return ret; + ret = walk_pt(0, ~0UL, move_pt, &boundary_pfn); + if ( ret ) + return ret; + + /* Move new kernel image pages. */ + ret = walk_pt(kernel, kernel + kernel_size - 1, move_leaf, &boundary_pfn); + if ( ret ) + return ret; + + return 0; +} + +void kexec_move_used_pages_undo(void) +{ + if ( kexec_gdt ) + { + gdt_ptr.base = (unsigned long)&gdt; + asm volatile("lgdt %0" : : "m" (gdt_ptr)); + free_page((void *)kexec_gdt); + kexec_gdt = 0; + } + + if ( kexec_idt ) + { + idt_ptr.base = (unsigned long)&idt; + asm volatile("lidt %0" : : "m" (idt_ptr)); + free_page((void *)kexec_idt); + kexec_idt = 0; + } +} +#endif diff --git a/include/kexec.h b/include/kexec.h index 7b103dea..411fa013 100644 --- a/include/kexec.h +++ b/include/kexec.h @@ -49,4 +49,9 @@ void kexec_set_param_loc(const char *cmdline); int kexec_get_entry(const char *cmdline); void kexec_get_entry_undo(void); +/* Move used pages away from new kernel area. */ +int kexec_move_used_pages(unsigned long boundary, unsigned long kernel, + unsigned long kernel_size); +void kexec_move_used_pages_undo(void); + #endif /* _KEXEC_H */ diff --git a/kexec.c b/kexec.c index e762fbeb..3b11a69c 100644 --- a/kexec.c +++ b/kexec.c @@ -183,11 +183,17 @@ int kexec(void *kernel, unsigned long kernel_size, const char *cmdline) goto err; } + ret = kexec_move_used_pages(kexec_last_addr, (unsigned long)kernel, + kernel_size); + if ( ret ) + goto err; + /* Error exit. */ ret = ENOSYS; err: unreserve_memory_below(); + kexec_move_used_pages_undo(); kexec_get_entry_undo(); return ret; -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Mon Jun 16 08:50:51 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 16 Jun 2025 08:50:51 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1016969.1393985 (Exim 4.92) (envelope-from ) id 1uR5YJ-0005EL-17; Mon, 16 Jun 2025 08:50:51 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1016969.1393985; Mon, 16 Jun 2025 08:50:50 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uR5YI-0005Ds-RX; Mon, 16 Jun 2025 08:50:50 +0000 Received: by outflank-mailman (input) for mailman id 1016969; 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none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750063620; 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=fyowQBL0+KxczJ3QgQBuNM66VYPd6WBeOp+F4jmgKk4=; b=b8TE957bRIDX2dKj2D4qCqXjot6zF2lhHmjCjRiwyB9XpopFzubXSiXK8jpJthg5yFsgrA yHw/6RvRm5L75cgVyPPBpVKIpW/tNqKH6H/6o1Ct0d25D+ny7ImtKuSfGrDwA+OnZ6JyvK aJvjIyol4usendyS26lfrJa4TZf3ii0= 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 07/12] mini-os: kexec: build parameters for new kernel Date: Mon, 16 Jun 2025 10:46:14 +0200 Message-ID: <20250616084619.11112-8-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250616084619.11112-1-jgross@suse.com> References: <20250616084619.11112-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-2.80 / 50.00]; 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Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- arch/x86/kexec.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++ include/kexec.h | 4 ++++ kexec.c | 13 ++++++++++- 3 files changed, 74 insertions(+), 1 deletion(-) diff --git a/arch/x86/kexec.c b/arch/x86/kexec.c index 47830905..fc58473e 100644 --- a/arch/x86/kexec.c +++ b/arch/x86/kexec.c @@ -199,6 +199,7 @@ bool kexec_arch_need_analyze_shdrs(void) static unsigned long kexec_param_loc; static unsigned int kexec_param_size; +static unsigned long kexec_param_mem; void kexec_set_param_loc(const char *cmdline) { @@ -211,4 +212,61 @@ void kexec_set_param_loc(const char *cmdline) kexec_last_addr += kexec_param_size; kexec_last_addr = round_pgup(kexec_last_addr); } + +int kexec_get_entry(const char *cmdline) +{ + struct hvm_start_info *info; + struct hvm_memmap_table_entry *mmap; + unsigned int order; + unsigned int i; + + if ( kernel_phys_entry == ~0UL ) + return ENOEXEC; + + order = get_order(kexec_param_size); + + kexec_param_mem = alloc_pages(order); + if ( !kexec_param_mem ) + return ENOMEM; + + info = (struct hvm_start_info *)kexec_param_mem; + memset(info, 0, sizeof(*info)); + info->magic = XEN_HVM_START_MAGIC_VALUE; + info->version = 1; + info->cmdline_paddr = kexec_param_mem + sizeof(*info) + + e820_entries * sizeof(struct hvm_memmap_table_entry); + info->memmap_paddr = kexec_param_mem + sizeof(*info); + info->memmap_entries = e820_entries; + + mmap = (struct hvm_memmap_table_entry *)(info + 1); + for ( i = 0; i < e820_entries; i++ ) + { + mmap->addr = e820_map[i].addr; + mmap->size = e820_map[i].size; + mmap->type = e820_map[i].type; + mmap++; + } + + strcpy((char *)mmap, cmdline); + + if ( kexec_add_action(KEXEC_COPY, to_virt(kexec_param_loc), 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) ) + return ENOSPC; + + return 0; +} + +void kexec_get_entry_undo(void) +{ + if ( kexec_param_mem ) + { + free_pages((void *)kexec_param_mem, get_order(kexec_param_size)); + kexec_param_mem = 0; + } +} #endif /* CONFIG_KEXEC */ diff --git a/include/kexec.h b/include/kexec.h index 8a2b552f..7b103dea 100644 --- a/include/kexec.h +++ b/include/kexec.h @@ -45,4 +45,8 @@ bool kexec_arch_need_analyze_shdrs(void); /* Finalize parameter location and size. */ void kexec_set_param_loc(const char *cmdline); +/* Get entry point and parameter of new kernel. */ +int kexec_get_entry(const char *cmdline); +void kexec_get_entry_undo(void); + #endif /* _KEXEC_H */ diff --git a/kexec.c b/kexec.c index 1a90d8ab..e762fbeb 100644 --- a/kexec.c +++ b/kexec.c @@ -176,10 +176,21 @@ int kexec(void *kernel, unsigned long kernel_size, const char *cmdline) reserve_memory_below(kexec_last_addr); + ret = kexec_get_entry(cmdline); + if ( ret ) + { + printk("kexec: ELF file of new kernel has no valid entry point\n"); + goto err; + } + /* Error exit. */ + ret = ENOSYS; + + err: unreserve_memory_below(); + kexec_get_entry_undo(); - return ENOSYS; + return ret; } EXPORT_SYMBOL(kexec); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Mon Jun 16 08:50:52 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 16 Jun 2025 08:50:52 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1016977.1393995 (Exim 4.92) (envelope-from ) id 1uR5YK-0005Vb-LF; 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Mon, 16 Jun 2025 08:47:23 +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 1BCF7139E2; Mon, 16 Jun 2025 08:47:23 +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 +Cs4BRvaT2hAQAAAD6G6ig (envelope-from ); Mon, 16 Jun 2025 08:47:23 +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: 85a0fdfd-4a8e-11f0-b894-0df219b8e170 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750063643; 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=k/MeYSsGBJ27+vnobz1RvxbDTqVako7BAJOkWTQLl8E=; b=GXDjXMGo+0jyW1vB1crqi8s5c4HCfFeRis9b1zeJ45ctD3I/jEBpSePWxd+6dr05WO8bUM VEC11DAu0zCijo+VAjliNqxmux25hCpMVsyRzX9BKg1AZCzDfzQo0X5u7N+MYSqwgsPhF1 kfjYWesKAEyZNk9NLbamW9ewCBDyygM= Authentication-Results: smtp-out1.suse.de; dkim=pass header.d=suse.com header.s=susede1 header.b=GXDjXMGo DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750063643; 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=k/MeYSsGBJ27+vnobz1RvxbDTqVako7BAJOkWTQLl8E=; b=GXDjXMGo+0jyW1vB1crqi8s5c4HCfFeRis9b1zeJ45ctD3I/jEBpSePWxd+6dr05WO8bUM VEC11DAu0zCijo+VAjliNqxmux25hCpMVsyRzX9BKg1AZCzDfzQo0X5u7N+MYSqwgsPhF1 kfjYWesKAEyZNk9NLbamW9ewCBDyygM= 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 11/12] mini-os: kexec: add kexec callback functionality Date: Mon, 16 Jun 2025 10:46:18 +0200 Message-ID: <20250616084619.11112-12-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250616084619.11112-1-jgross@suse.com> References: <20250616084619.11112-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Queue-Id: 53FAB21203 X-Rspamd-Action: no action X-Spam-Flag: NO X-Spamd-Result: default: False [-3.01 / 50.00]; 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The called functions will be called with a boolean parameter "undo" indicating whether a previous call needs to be undone due to a failure during kexec(). The related loop to call all callbacks is added to kexec(). Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- arch/x86/minios-x86.lds.S | 8 ++++++++ include/kexec.h | 6 ++++++ kexec.c | 13 +++++++++++++ 3 files changed, 27 insertions(+) diff --git a/arch/x86/minios-x86.lds.S b/arch/x86/minios-x86.lds.S index 8a1db7d4..8c6e0a60 100644 --- a/arch/x86/minios-x86.lds.S +++ b/arch/x86/minios-x86.lds.S @@ -58,6 +58,14 @@ SECTIONS } PROVIDE (__fini_array_end = .); +#if defined(CONFIG_KEXEC) + PROVIDE (__kexec_array_start = .); + .kexec_array : { + *(.kexec_array) + } + PROVIDE (__kexec_array_end = .); +#endif + .ctors : { __CTOR_LIST__ = .; *(.ctors) diff --git a/include/kexec.h b/include/kexec.h index 411fa013..b89c3000 100644 --- a/include/kexec.h +++ b/include/kexec.h @@ -18,6 +18,12 @@ struct kexec_action { extern char _kexec_start[], _kexec_end[]; extern struct kexec_action kexec_actions[KEXEC_MAX_ACTIONS]; +extern unsigned long __kexec_array_start[], __kexec_array_end[]; + +typedef int(*kexeccall_t)(bool undo); +#define kexec_call(func) \ + static kexeccall_t __kexeccall_##func __attribute__((__used__)) \ + __attribute__((__section__(".kexec_array"))) = func extern unsigned long kexec_last_addr; diff --git a/kexec.c b/kexec.c index 1ef7ce84..f42aa8ad 100644 --- a/kexec.c +++ b/kexec.c @@ -167,6 +167,7 @@ static int analyze_kernel(void *kernel, unsigned long size) int kexec(void *kernel, unsigned long kernel_size, const char *cmdline) { int ret; + unsigned long *func; ret = analyze_kernel(kernel, kernel_size); if ( ret ) @@ -190,6 +191,18 @@ int kexec(void *kernel, unsigned long kernel_size, const char *cmdline) if ( ret ) goto err; + for ( func = __kexec_array_start; func < __kexec_array_end; func++ ) + { + ret = ((kexeccall_t)(*func))(false); + if ( ret ) + { + for ( func--; func >= __kexec_array_start; func-- ) + ((kexeccall_t)(*func))(true); + + goto err; + } + } + /* Error exit. */ ret = ENOSYS; -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Thu Jun 19 11:38:14 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Thu, 19 Jun 2025 11:38:14 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1019958.1396398 (Exim 4.92) (envelope-from ) id 1uSDau-0001ro-Q2; Thu, 19 Jun 2025 11:38:12 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1019958.1396398; Thu, 19 Jun 2025 11:38:12 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uSDau-0001ql-ME; Thu, 19 Jun 2025 11:38:12 +0000 Received: by outflank-mailman (input) for mailman id 1019958; Thu, 19 Jun 2025 11:38:11 +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 1uSDat-0001ot-CK for minios-devel@lists.xenproject.org; Thu, 19 Jun 2025 11:38:11 +0000 Received: from smtp-out1.suse.de (smtp-out1.suse.de [2a07:de40:b251:101:10:150:64:1]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id debb60e2-4d01-11f0-b894-0df219b8e170; Thu, 19 Jun 2025 13:38:08 +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 29D2421167; Thu, 19 Jun 2025 11:38:07 +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 E7FAE136CC; Thu, 19 Jun 2025 11:38:06 +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 y8a9Np72U2hVbgAAD6G6ig (envelope-from ); Thu, 19 Jun 2025 11:38:06 +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: debb60e2-4d01-11f0-b894-0df219b8e170 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750333087; 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=fHu1G+O8pg228Mge4annxJlFqTCUB9Its+MVOrMgr5k=; b=cgREe0QHD/+lvL9hfMzJWOenrMciV0S97Sv1mW2XobOLy3ffugLwYKtTGyUKpaXAzm0Ho4 4CTUEbB9hmpHGOH4GWCOthxYpx3b4ofL4GNtvFfO4Z9AFFZT+cX4+vsdo5yoBReZYfE5jZ VTU06wFAnB8NEqv5O9hUm8mwB7BPYTw= Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750333087; 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=fHu1G+O8pg228Mge4annxJlFqTCUB9Its+MVOrMgr5k=; b=cgREe0QHD/+lvL9hfMzJWOenrMciV0S97Sv1mW2XobOLy3ffugLwYKtTGyUKpaXAzm0Ho4 4CTUEbB9hmpHGOH4GWCOthxYpx3b4ofL4GNtvFfO4Z9AFFZT+cX4+vsdo5yoBReZYfE5jZ VTU06wFAnB8NEqv5O9hUm8mwB7BPYTw= 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 0/6] hide struct start_info from PVH code Date: Thu, 19 Jun 2025 13:37:58 +0200 Message-ID: <20250619113804.32694-1-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]; 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]; RCVD_TLS_ALL(0.00)[] X-Spam-Level: X-Spam-Flag: NO X-Spam-Score: -2.80 While working on xenstore-stubdom live update support I came across some really unpleasant code using struct start_info even when running in PVH mode. Especially suspend/resume was doing some crazy stuff, including overwriting the initial struct hvm_start_info partially. This series is hiding struct start_info from PVH code. This didn't result in any runtime error, but in future I'll need to access struct hvm_start_info some time after boot, so I need to get that fixed. Tested especially with xl suspend/resume and xl save/restore in PV and in PVH mode. Juergen Gross (6): suspend: drop crazy pfn handling for PVH setup: drop parameter from map_shared_info() x86/pv: remove global start_info console: drop parameter from get_console() xenbus: drop parameter from get_xenbus() x86/pv: make start_info_ptr PV-only arch/arm/setup.c | 6 ++-- arch/x86/setup.c | 69 ++++++++++++-------------------------------- console.c | 10 +++---- hypervisor.c | 2 +- include/console.h | 2 +- include/hypervisor.h | 14 ++------- include/xenbus.h | 4 +-- xenbus.c | 13 ++++----- 8 files changed, 39 insertions(+), 81 deletions(-) -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Thu Jun 19 11:38:16 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Thu, 19 Jun 2025 11:38:16 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1019960.1396412 (Exim 4.92) (envelope-from ) id 1uSDay-00027t-4k; Thu, 19 Jun 2025 11:38:16 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1019960.1396412; 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bh=4NoXCUJ5pbRtKgxow6UIhaYz4x9FU3aA2ofy2y28z+k=; b=l3NDVSZyBXd6Z+VTJoUNcoN2B3WvjsNPdkRVRQWhFK0pJsWRHgzBwTcB13hmLzohRjUtzz 2vsI2QNXOpX3C3v+AEz0p927igtaque4yFWjg/T6BhYygHc9v2PQ74FyIkUAN54oKzAiT1 nvj+a39NlLYIbihX7Z4yoGtKU3gcxoo= Authentication-Results: smtp-out2.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750333092; 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=4NoXCUJ5pbRtKgxow6UIhaYz4x9FU3aA2ofy2y28z+k=; b=qa9mkXZ37DVz9h4UFXq4IYoSZ84vVmAkzx3WRHkjyOpeb3DwFAoujOwgiXpAlQFPvq/VMC Ic/GnQytzbBCPPITry52MQgVXAplLeAKZclI5lDAntSzhJgu3L1+Fb/A7coIbS2wSaCeVH tZrwMBPfphLUwjxdyDPqYSryCId414c= 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 1/6] suspend: drop crazy pfn handling for PVH Date: Thu, 19 Jun 2025 13:37:59 +0200 Message-ID: <20250619113804.32694-2-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250619113804.32694-1-jgross@suse.com> References: <20250619113804.32694-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Flag: NO X-Spam-Score: -6.80 X-Spamd-Result: default: False [-6.80 / 50.00]; REPLY(-4.00)[]; 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]; MIME_TRACE(0.00)[0:+]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; ARC_NA(0.00)[]; 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)[imap1.dmz-prg2.suse.org:helo] X-Spam-Level: Suspend for PVH is doing some crazy stuff with the Xenstore and console PFNs: - In arch_pre_suspend() the PFNs are "translated" to MFNs, even if that translation is a nop. - The result is stored via start_info_ptr, which points to a struct start_info only in case of PV mode. - After resuming or a cancelled suspend, the PFNs are retrieved again and "translated". - The "MFNs" are stored again via start_info_ptr, which is still not pointing at a struct start_info, and from where the data is never read again after that. Drop all of that completely. Signed-off-by: Juergen Gross --- arch/x86/setup.c | 22 ---------------------- 1 file changed, 22 deletions(-) diff --git a/arch/x86/setup.c b/arch/x86/setup.c index b613083b..e30eb065 100644 --- a/arch/x86/setup.c +++ b/arch/x86/setup.c @@ -227,17 +227,6 @@ void arch_pre_suspend(void) virt_to_pfn(mfn_to_virt(start_info_ptr->store_mfn)); start_info_ptr->console.domU.mfn = virt_to_pfn(mfn_to_virt(start_info_ptr->console.domU.mfn)); -#else - uint64_t store_v; - uint64_t console_v; - - if( hvm_get_parameter(HVM_PARAM_STORE_PFN, &store_v) ) - BUG(); - start_info_ptr->store_mfn = store_v; - - if( hvm_get_parameter(HVM_PARAM_CONSOLE_PFN, &console_v) ) - BUG(); - start_info_ptr->console.domU.mfn = console_v; #endif unmap_shared_info(); @@ -262,17 +251,6 @@ void arch_post_suspend(int canceled) } else { memcpy(&start_info, start_info_ptr, sizeof(start_info_t)); } -#else - uint64_t store_v; - uint64_t console_v; - - if (hvm_get_parameter(HVM_PARAM_STORE_PFN, &store_v)) - BUG(); - start_info_ptr->store_mfn = pfn_to_mfn(store_v); - - if (hvm_get_parameter(HVM_PARAM_CONSOLE_PFN, &console_v)) - BUG(); - start_info_ptr->console.domU.mfn = pfn_to_mfn(console_v); #endif HYPERVISOR_shared_info = map_shared_info((void*) start_info_ptr); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Thu Jun 19 11:38:21 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Thu, 19 Jun 2025 11:38:21 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1019961.1396420 (Exim 4.92) (envelope-from ) id 1uSDb3-0002Qo-8K; Thu, 19 Jun 2025 11:38:21 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1019961.1396420; Thu, 19 Jun 2025 11:38:21 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uSDb3-0002Qh-5V; Thu, 19 Jun 2025 11:38:21 +0000 Received: by outflank-mailman (input) for mailman id 1019961; Thu, 19 Jun 2025 11:38:19 +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 1uSDb1-00024Q-G9 for minios-devel@lists.xenproject.org; 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Thu, 19 Jun 2025 11:38:18 +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: e55771f9-4d01-11f0-a30c-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750333098; 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=q7iU8G8KB8ff9iK1iRznz/sdoVaMREHLMXYxPjB0hj4=; b=JU0g8i4NjM0Qn9aAyZ4vguZqi6Ro4/zU7IWxryoabJw91KRD4dWnaGFMGyDS1ehQtHE5+U Oo2R2IWiB6rUjNam/KNqdt0PjB/P77sPfbF5bDAxeIaayXD601uc1BsYB+1k4Iiv1cdPLr eIpV7yRC0O/dontmnMW78PJEk4DE7Gg= Authentication-Results: smtp-out2.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750333098; 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=q7iU8G8KB8ff9iK1iRznz/sdoVaMREHLMXYxPjB0hj4=; b=JU0g8i4NjM0Qn9aAyZ4vguZqi6Ro4/zU7IWxryoabJw91KRD4dWnaGFMGyDS1ehQtHE5+U Oo2R2IWiB6rUjNam/KNqdt0PjB/P77sPfbF5bDAxeIaayXD601uc1BsYB+1k4Iiv1cdPLr eIpV7yRC0O/dontmnMW78PJEk4DE7Gg= 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 2/6] setup: drop parameter from map_shared_info() Date: Thu, 19 Jun 2025 13:38:00 +0200 Message-ID: <20250619113804.32694-3-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250619113804.32694-1-jgross@suse.com> References: <20250619113804.32694-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-6.80 / 50.00]; REPLY(-4.00)[]; 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]; MIME_TRACE(0.00)[0:+]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; ARC_NA(0.00)[]; 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)[imap1.dmz-prg2.suse.org:helo] X-Spam-Level: X-Spam-Flag: NO X-Spam-Score: -6.80 The parameter of map_shared_info() is evaluated in PV mode only, and it is always the pointer to the initial struct start_info from boot time. By setting start_info_ptr a little bit earlier the PV variant of map_shared_info() can just use start_info_ptr instead of a parameter. Signed-off-by: Juergen Gross --- arch/arm/setup.c | 2 +- arch/x86/setup.c | 12 ++++++------ hypervisor.c | 2 +- include/hypervisor.h | 2 +- 4 files changed, 9 insertions(+), 9 deletions(-) diff --git a/arch/arm/setup.c b/arch/arm/setup.c index 3d112fae..1bcfa689 100644 --- a/arch/arm/setup.c +++ b/arch/arm/setup.c @@ -38,7 +38,7 @@ void arch_init(void *dtb_pointer, uint32_t physical_offset) device_tree = dtb_pointer; /* Map shared_info page */ - HYPERVISOR_shared_info = map_shared_info(NULL); + HYPERVISOR_shared_info = map_shared_info(); get_console(NULL); get_xenbus(NULL); diff --git a/arch/x86/setup.c b/arch/x86/setup.c index e30eb065..1bdf9509 100644 --- a/arch/x86/setup.c +++ b/arch/x86/setup.c @@ -79,11 +79,10 @@ static inline void sse_init(void) { #ifdef CONFIG_PARAVIRT #define hpc_init() -shared_info_t *map_shared_info(void *p) +shared_info_t *map_shared_info(void) { int rc; - start_info_t *si = p; - unsigned long pa = si->shared_info; + unsigned long pa = start_info_ptr->shared_info; if ( (rc = HYPERVISOR_update_va_mapping((unsigned long)shared_info, __pte(pa | 7), UVMF_INVLPG)) ) @@ -185,6 +184,8 @@ arch_init(void *par) { static char hello[] = "Bootstrapping...\n"; + start_info_ptr = par; + hpc_init(); (void)HYPERVISOR_console_io(CONSOLEIO_write, strlen(hello), hello); @@ -206,7 +207,7 @@ arch_init(void *par) get_cmdline(par); /* Grab the shared_info pointer and put it in a safe place. */ - HYPERVISOR_shared_info = map_shared_info(par); + HYPERVISOR_shared_info = map_shared_info(); /* print out some useful information */ print_start_of_day(par); @@ -214,7 +215,6 @@ arch_init(void *par) #ifdef CONFIG_PARAVIRT memcpy(&start_info, par, sizeof(start_info)); #endif - start_info_ptr = (start_info_t *)par; start_kernel(); } @@ -253,7 +253,7 @@ void arch_post_suspend(int canceled) } #endif - HYPERVISOR_shared_info = map_shared_info((void*) start_info_ptr); + HYPERVISOR_shared_info = map_shared_info(); #ifndef CONFIG_PARAVIRT xen_callback_vector(); #endif diff --git a/hypervisor.c b/hypervisor.c index ba535556..6476d658 100644 --- a/hypervisor.c +++ b/hypervisor.c @@ -65,7 +65,7 @@ int hvm_set_parameter(int idx, uint64_t value) return HYPERVISOR_hvm_op(HVMOP_set_param, &xhv); } -shared_info_t *map_shared_info(void *p) +shared_info_t *map_shared_info(void) { struct xen_add_to_physmap xatp; diff --git a/include/hypervisor.h b/include/hypervisor.h index b852a42a..aef142d1 100644 --- a/include/hypervisor.h +++ b/include/hypervisor.h @@ -42,7 +42,7 @@ extern union start_info_union start_info_union; int hvm_get_parameter(int idx, uint64_t *value); int hvm_set_parameter(int idx, uint64_t value); #endif -shared_info_t *map_shared_info(void *p); +shared_info_t *map_shared_info(void); void unmap_shared_info(void); void force_evtchn_callback(void); void do_hypervisor_callback(struct pt_regs *regs); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Thu Jun 19 11:38:27 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Thu, 19 Jun 2025 11:38:27 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1019965.1396435 (Exim 4.92) (envelope-from ) id 1uSDb9-0002r1-Iq; Thu, 19 Jun 2025 11:38:27 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1019965.1396435; Thu, 19 Jun 2025 11:38:27 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uSDb9-0002qq-FL; Thu, 19 Jun 2025 11:38:27 +0000 Received: by outflank-mailman (input) for mailman id 1019965; Thu, 19 Jun 2025 11:38:25 +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 1uSDb7-0001ot-UG for minios-devel@lists.xenproject.org; Thu, 19 Jun 2025 11:38:25 +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 e8ad3038-4d01-11f0-b894-0df219b8e170; Thu, 19 Jun 2025 13:38:24 +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 2242D21167; Thu, 19 Jun 2025 11:38:24 +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 E34FC136CC; Thu, 19 Jun 2025 11:38:23 +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 GWO6Na/2U2hobgAAD6G6ig (envelope-from ); Thu, 19 Jun 2025 11:38:23 +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: e8ad3038-4d01-11f0-b894-0df219b8e170 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 3/6] x86/pv: remove global start_info Date: Thu, 19 Jun 2025 13:38:01 +0200 Message-ID: <20250619113804.32694-4-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250619113804.32694-1-jgross@suse.com> References: <20250619113804.32694-1-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-Spamd-Result: default: False [-4.00 / 50.00]; REPLY(-4.00)[] X-Rspamd-Queue-Id: 2242D21167 X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Rspamd-Action: no action X-Spam-Level: X-Spam-Flag: NO X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Spam-Score: -4.00 Add an extern declaration for start_info_ptr when running in PV mode and use that instead of the copy held in start_info. This allows to drop start_info. Signed-off-by: Juergen Gross --- arch/x86/setup.c | 17 +---------------- console.c | 2 +- include/hypervisor.h | 12 ++---------- xenbus.c | 2 +- 4 files changed, 5 insertions(+), 28 deletions(-) diff --git a/arch/x86/setup.c b/arch/x86/setup.c index 1bdf9509..4e2f0749 100644 --- a/arch/x86/setup.c +++ b/arch/x86/setup.c @@ -35,17 +35,8 @@ #include #include -#ifdef CONFIG_PARAVIRT -/* - * This structure contains start-of-day info, such as pagetable base pointer, - * address of the shared_info structure, and things like that. - */ -union start_info_union start_info_union; -EXPORT_SYMBOL(start_info_union); -#endif - /* - * This pointer holds a reference to the copy of the start_info struct. + * This pointer holds a reference to the start_info struct. */ start_info_t *start_info_ptr; @@ -212,10 +203,6 @@ arch_init(void *par) /* print out some useful information */ print_start_of_day(par); -#ifdef CONFIG_PARAVIRT - memcpy(&start_info, par, sizeof(start_info)); -#endif - start_kernel(); } @@ -248,8 +235,6 @@ void arch_post_suspend(int canceled) if (canceled) { start_info_ptr->store_mfn = pfn_to_mfn(start_info_ptr->store_mfn); start_info_ptr->console.domU.mfn = pfn_to_mfn(start_info_ptr->console.domU.mfn); - } else { - memcpy(&start_info, start_info_ptr, sizeof(start_info_t)); } #endif diff --git a/console.c b/console.c index 0107b685..a4c50371 100644 --- a/console.c +++ b/console.c @@ -411,7 +411,7 @@ void xencons_ring_resume(struct consfront_dev *dev) if ( dev ) { #if CONFIG_PARAVIRT - get_console(&start_info); + get_console(start_info_ptr); #else get_console(0); #endif diff --git a/include/hypervisor.h b/include/hypervisor.h index aef142d1..f40bc8c3 100644 --- a/include/hypervisor.h +++ b/include/hypervisor.h @@ -28,16 +28,8 @@ /* hypervisor.c */ #ifdef CONFIG_PARAVIRT -/* - * a placeholder for the start of day information passed up from the hypervisor - */ -union start_info_union -{ - start_info_t start_info; - char padding[512]; -}; -extern union start_info_union start_info_union; -#define start_info (start_info_union.start_info) +/* A pointer to the start of day information passed up from the hypervisor. */ +extern start_info_t *start_info_ptr; #else int hvm_get_parameter(int idx, uint64_t *value); int hvm_set_parameter(int idx, uint64_t value); diff --git a/xenbus.c b/xenbus.c index 686428a4..43fdebd7 100644 --- a/xenbus.c +++ b/xenbus.c @@ -469,7 +469,7 @@ void resume_xenbus(int canceled) struct xsd_sockmsg *rep; #ifdef CONFIG_PARAVIRT - get_xenbus(&start_info); + get_xenbus(start_info_ptr); #else get_xenbus(0); #endif -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Thu Jun 19 11:38:33 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Thu, 19 Jun 2025 11:38:33 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1019972.1396458 (Exim 4.92) (envelope-from ) id 1uSDbF-0003ac-5x; Thu, 19 Jun 2025 11:38:33 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1019972.1396458; Thu, 19 Jun 2025 11:38:33 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uSDbF-0003a3-1v; 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Thu, 19 Jun 2025 11:38:29 +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 2acoIrX2U2hsbgAAD6G6ig (envelope-from ); Thu, 19 Jun 2025 11:38:29 +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: ec20a5db-4d01-11f0-b894-0df219b8e170 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750333109; 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=mAZCg+rbfuFhOY9Ie1hCPmXCmFyEVH0iN6dKrSsrr9A=; b=UlSupCBty164s4CUAm/vTsyKp/eEua2pc959kIgjS9STIlMOhCgls7fOQIwjGxTVg+3K3f 7Pv5AWFTSkKUxRnj++U7ZO7jYFgdMsHtlAS4QOHcHDNoPGW9yoLCNolsOseKSg6JvewZ9K PkvbBdj+514ZuOehxhaa035Ex7muHHw= Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750333109; 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=mAZCg+rbfuFhOY9Ie1hCPmXCmFyEVH0iN6dKrSsrr9A=; b=UlSupCBty164s4CUAm/vTsyKp/eEua2pc959kIgjS9STIlMOhCgls7fOQIwjGxTVg+3K3f 7Pv5AWFTSkKUxRnj++U7ZO7jYFgdMsHtlAS4QOHcHDNoPGW9yoLCNolsOseKSg6JvewZ9K PkvbBdj+514ZuOehxhaa035Ex7muHHw= 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 4/6] console: drop parameter from get_console() Date: Thu, 19 Jun 2025 13:38:02 +0200 Message-ID: <20250619113804.32694-5-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250619113804.32694-1-jgross@suse.com> References: <20250619113804.32694-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-6.80 / 50.00]; REPLY(-4.00)[]; 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]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_TLS_ALL(0.00)[] X-Spam-Level: X-Spam-Flag: NO X-Spam-Score: -6.80 The parameter of get_console() is used only when running in PV mode, and it always has the same value. Drop the parameter and use start_info_ptr directly in the PV variant of get_console(). Signed-off-by: Juergen Gross --- arch/arm/setup.c | 2 +- arch/x86/setup.c | 2 +- console.c | 10 +++++----- include/console.h | 2 +- 4 files changed, 8 insertions(+), 8 deletions(-) diff --git a/arch/arm/setup.c b/arch/arm/setup.c index 1bcfa689..161d137d 100644 --- a/arch/arm/setup.c +++ b/arch/arm/setup.c @@ -40,7 +40,7 @@ void arch_init(void *dtb_pointer, uint32_t physical_offset) /* Map shared_info page */ HYPERVISOR_shared_info = map_shared_info(); - get_console(NULL); + get_console(); get_xenbus(NULL); gic_init(); diff --git a/arch/x86/setup.c b/arch/x86/setup.c index 4e2f0749..2b314aa2 100644 --- a/arch/x86/setup.c +++ b/arch/x86/setup.c @@ -193,7 +193,7 @@ arch_init(void *par) /* WARN: don't do printk before here, it uses information from shared_info. Use xprintk instead. */ - get_console(par); + get_console(); get_xenbus(par); get_cmdline(par); diff --git a/console.c b/console.c index a4c50371..48c5be43 100644 --- a/console.c +++ b/console.c @@ -197,15 +197,15 @@ uint32_t console_evtchn; static struct consfront_dev* resume_xen_console(struct consfront_dev *dev); #ifdef CONFIG_PARAVIRT -void get_console(void *p) +void get_console(void) { - start_info_t *si = p; + start_info_t *si = start_info_ptr; console_ring = mfn_to_virt(si->console.domU.mfn); console_evtchn = si->console.domU.evtchn; } #else -void get_console(void *p) +void get_console(void) { uint64_t v = -1; @@ -411,9 +411,9 @@ void xencons_ring_resume(struct consfront_dev *dev) if ( dev ) { #if CONFIG_PARAVIRT - get_console(start_info_ptr); + get_console(); #else - get_console(0); + get_console(); #endif resume_xen_console(dev); } diff --git a/include/console.h b/include/console.h index d216d247..326e993b 100644 --- a/include/console.h +++ b/include/console.h @@ -76,7 +76,7 @@ void xprintk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); void xencons_rx(char *buf, unsigned len, struct pt_regs *regs); void xencons_tx(void); -void get_console(void *p); +void get_console(void); void init_console(void); void console_print(struct consfront_dev *dev, const char *data, int length); void fini_consfront(struct consfront_dev *dev); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Thu Jun 19 11:40:50 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Thu, 19 Jun 2025 11:40:50 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1020012.1396462 (Exim 4.92) (envelope-from ) id 1uSDdS-0005oV-C7; Thu, 19 Jun 2025 11:40:50 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1020012.1396462; Thu, 19 Jun 2025 11:40:50 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uSDdS-0005oO-9Z; Thu, 19 Jun 2025 11:40:50 +0000 Received: by outflank-mailman (input) for mailman id 1020012; Thu, 19 Jun 2025 11:40:48 +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 1uSDbQ-00024Q-Js for minios-devel@lists.xenproject.org; Thu, 19 Jun 2025 11:38:44 +0000 Received: from smtp-out1.suse.de (smtp-out1.suse.de [2a07:de40:b251:101:10:150:64:1]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id f2de720b-4d01-11f0-a30c-13f23c93f187; Thu, 19 Jun 2025 13:38:41 +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 3E47121167; Thu, 19 Jun 2025 11:38:41 +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 05CCA136CC; Thu, 19 Jun 2025 11:38:40 +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 8Sf2OsD2U2iIbgAAD6G6ig (envelope-from ); Thu, 19 Jun 2025 11:38:40 +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: f2de720b-4d01-11f0-a30c-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 6/6] x86/pv: make start_info_ptr PV-only Date: Thu, 19 Jun 2025 13:38:04 +0200 Message-ID: <20250619113804.32694-7-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250619113804.32694-1-jgross@suse.com> References: <20250619113804.32694-1-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-Server: rspamd2.dmz-prg2.suse.org X-Spam-Level: X-Spamd-Result: default: False [-4.00 / 50.00]; REPLY(-4.00)[] X-Spam-Flag: NO X-Rspamd-Queue-Id: 3E47121167 X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Rspamd-Action: no action X-Spam-Score: -4.00 Hide start_info_ptr via CONFIG_PARAVIRT in order to avoid accesses to it form not PV specific code. Signed-off-by: Juergen Gross --- arch/x86/setup.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/arch/x86/setup.c b/arch/x86/setup.c index 590f51a8..b3fc835a 100644 --- a/arch/x86/setup.c +++ b/arch/x86/setup.c @@ -35,11 +35,6 @@ #include #include -/* - * This pointer holds a reference to the start_info struct. - */ -start_info_t *start_info_ptr; - /* * Shared page for communicating with the hypervisor. * Events flags go here, for example. @@ -68,6 +63,11 @@ static inline void sse_init(void) { #endif #ifdef CONFIG_PARAVIRT +/* + * This pointer holds a reference to the start_info struct. + */ +start_info_t *start_info_ptr; + #define hpc_init() shared_info_t *map_shared_info(void) @@ -175,7 +175,9 @@ arch_init(void *par) { static char hello[] = "Bootstrapping...\n"; +#ifdef CONFIG_PARAVIRT start_info_ptr = par; +#endif hpc_init(); (void)HYPERVISOR_console_io(CONSOLEIO_write, strlen(hello), hello); @@ -226,7 +228,11 @@ int arch_suspend(void) * This hypercall returns 1 if the suspend * was cancelled and 0 if resuming in a new domain */ +#ifdef CONFIG_PARAVIRT return HYPERVISOR_suspend(virt_to_mfn(start_info_ptr)); +#else + return HYPERVISOR_suspend(0); +#endif } void arch_post_suspend(int canceled) -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Thu Jun 19 11:41:41 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Thu, 19 Jun 2025 11:41:41 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1020047.1396486 (Exim 4.92) (envelope-from ) id 1uSDeH-0007IN-0s; Thu, 19 Jun 2025 11:41:41 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1020047.1396486; Thu, 19 Jun 2025 11:41:40 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uSDeG-0007IG-UM; Thu, 19 Jun 2025 11:41:40 +0000 Received: by outflank-mailman (input) for mailman id 1020047; Thu, 19 Jun 2025 11:41:39 +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 1uSDbK-00024Q-IX for minios-devel@lists.xenproject.org; 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Thu, 19 Jun 2025 11:38:35 +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: ef7cff31-4d01-11f0-a30c-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750333115; 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=eszOXMsGlkE+H8zrsAa6Rle4nZFAVUiFkelGTk1DgeI=; b=l5z/LV3TOCWcbEgfUI8RB3O/gLtmfV+XUy8xNe1+ny6/t1zBTJ6U2AUIkz6plJwGdJ9yml d+GcgeWtmuka2hE7W44+/msbobLK6FsbpkjyguP5tavYMIhjxgR09jOVgLLbk+4skMWmUz jDr8dhPls+hgLm2MekfH1PqhJ0ZLllc= Authentication-Results: smtp-out2.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1750333115; 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=eszOXMsGlkE+H8zrsAa6Rle4nZFAVUiFkelGTk1DgeI=; b=l5z/LV3TOCWcbEgfUI8RB3O/gLtmfV+XUy8xNe1+ny6/t1zBTJ6U2AUIkz6plJwGdJ9yml d+GcgeWtmuka2hE7W44+/msbobLK6FsbpkjyguP5tavYMIhjxgR09jOVgLLbk+4skMWmUz jDr8dhPls+hgLm2MekfH1PqhJ0ZLllc= 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 5/6] xenbus: drop parameter from get_xenbus() Date: Thu, 19 Jun 2025 13:38:03 +0200 Message-ID: <20250619113804.32694-6-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250619113804.32694-1-jgross@suse.com> References: <20250619113804.32694-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-6.80 / 50.00]; REPLY(-4.00)[]; 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]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_TLS_ALL(0.00)[] X-Spam-Level: X-Spam-Flag: NO X-Spam-Score: -6.80 The parameter of get_xenbus() is used only when running in PV mode, and it always has the same value. Drop the parameter and use start_info_ptr directly in the PV variant of get_xenbus(). Signed-off-by: Juergen Gross --- arch/arm/setup.c | 2 +- arch/x86/setup.c | 2 +- include/xenbus.h | 4 ++-- xenbus.c | 13 +++++-------- 4 files changed, 9 insertions(+), 12 deletions(-) diff --git a/arch/arm/setup.c b/arch/arm/setup.c index 161d137d..e918a064 100644 --- a/arch/arm/setup.c +++ b/arch/arm/setup.c @@ -41,7 +41,7 @@ void arch_init(void *dtb_pointer, uint32_t physical_offset) HYPERVISOR_shared_info = map_shared_info(); get_console(); - get_xenbus(NULL); + get_xenbus(); gic_init(); diff --git a/arch/x86/setup.c b/arch/x86/setup.c index 2b314aa2..590f51a8 100644 --- a/arch/x86/setup.c +++ b/arch/x86/setup.c @@ -194,7 +194,7 @@ arch_init(void *par) /* WARN: don't do printk before here, it uses information from shared_info. Use xprintk instead. */ get_console(); - get_xenbus(par); + get_xenbus(); get_cmdline(par); /* Grab the shared_info pointer and put it in a safe place. */ diff --git a/include/xenbus.h b/include/xenbus.h index 542ee456..21da05e2 100644 --- a/include/xenbus.h +++ b/include/xenbus.h @@ -12,7 +12,7 @@ extern struct xenstore_domain_interface *xenstore_buf; /* Initialize the XenBus system. */ void init_xenbus(void); -void get_xenbus(void *p); +void get_xenbus(void); #else #define xenbus_evtchn ~0 #define xenstore_buf NULL @@ -20,7 +20,7 @@ void get_xenbus(void *p); static inline void init_xenbus(void) { } -static inline void get_xenbus(void *p) +static inline void get_xenbus(void) { } #endif diff --git a/xenbus.c b/xenbus.c index 43fdebd7..8225ed4b 100644 --- a/xenbus.c +++ b/xenbus.c @@ -74,15 +74,15 @@ uint32_t xenbus_evtchn; EXPORT_SYMBOL(xenbus_evtchn); #ifdef CONFIG_PARAVIRT -void get_xenbus(void *p) +void get_xenbus(void) { - start_info_t *si = p; + start_info_t *si = start_info_ptr; xenbus_evtchn = si->store_evtchn; xenstore_buf = mfn_to_virt(si->store_mfn); } #else -void get_xenbus(void *p) +void get_xenbus(void) { uint64_t v; @@ -468,11 +468,8 @@ void resume_xenbus(int canceled) struct write_req req[2]; struct xsd_sockmsg *rep; -#ifdef CONFIG_PARAVIRT - get_xenbus(start_info_ptr); -#else - get_xenbus(0); -#endif + get_xenbus(); + unmask_evtchn(xenbus_evtchn); if ( !canceled ) -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Fri Jun 20 13:01:16 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Fri, 20 Jun 2025 13:01:16 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1020953.1397064 (Exim 4.92) (envelope-from ) id 1uSbMp-0007O0-Cj; Fri, 20 Jun 2025 13:01:15 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1020953.1397064; Fri, 20 Jun 2025 13:01:15 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uSbMp-0007Nt-9w; 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pr=C Message-ID: <54316ade-83ad-4a34-8211-13b6947a1423@amd.com> Date: Fri, 20 Jun 2025 09:00:17 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH v2 02/12] Mini-OS: add final kexec stage To: Juergen Gross , , CC: References: <20250616084619.11112-1-jgross@suse.com> <20250616084619.11112-3-jgross@suse.com> Content-Language: en-US From: Jason Andryuk In-Reply-To: <20250616084619.11112-3-jgross@suse.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: None (SATLEXMB03.amd.com: jason.andryuk@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF0001AB54:EE_|CH2PR12MB9459:EE_ X-MS-Office365-Filtering-Correlation-Id: 2f16aa3d-3507-4601-588d-08ddaffa6623 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?eEVKTlNtZTNGMjQ4Vk1wNEN1dXRQNTJyUlNZYXNyVnVrU3pZdHpQNjRFSGJX?= =?utf-8?B?RzVRNkU3Ly9Pek1qUkpTcGFaTkdkUnRKYk11eEdXRElJekp1ck40NE1KZEM5?= =?utf-8?B?UTdHbFVmNk5rNXV1SEFseVlSOVJrWEduNFlQR2VJL1JGN0ZzY3VFNHBCMGFp?= =?utf-8?B?M05DVnpBZm4zZVg2VTc2SGw3YzJtbUdHMWJrc0xaczFFazdpUHRvSXY5MFo5?= =?utf-8?B?eU5mSS92aDU0R0YvY1Q4NFlYVXZrRDJGZEJuRk5Od0U3M1pNZ0FmeFRkSkU3?= =?utf-8?B?b3FCd3B5V29nU2psajVXMW5oSlRwVFlrUHc1TDZkY3N3NGdnTGdUVjFWVk96?= =?utf-8?B?Ui9kR1c5MzZ6eFdVNVZFaDBpOXVhUXc2ekdEWUlKazJqTncvbzBqN3NpcTFp?= =?utf-8?B?YkdZbnBPZ25iMndCMGE3blEwa2pucUtNaDBPZW5YZ0hhbjdGRzNBWXA5UmU1?= =?utf-8?B?RENKTmVyZ3JCbit0S0JDbit4bjBldUJKMS8wWkZ4TUZiNE5tbTVwNit5RkI0?= =?utf-8?B?eElZN0JvaFVieVhOdFd2bnNLRVlUVjBBMm5qZlVWWGp2VGRiY3FWREw4OGdE?= =?utf-8?B?cnpzaGJJM3pMcEF0L0pkNzBnTGx3VDBhNk4wSHdnQmNFa01tc3gyZEdsNU9z?= =?utf-8?B?VGZjN21YM3NTY3VKbmQwa2ZFOWxCVklTWXJzNXBsVEROTlNhYXlDR3FxQVg0?= =?utf-8?B?bGJQQUp5WHRzamdvSXY5K3U0dnN4NDFUZUdYR1VQbDNidENITWJhR1FLMzlZ?= =?utf-8?B?QTVlQk1TZ3E3cHlpY1BuZEdpQ0lSRHRSb2FoV0hMelRtdmF5ekZQaUJiUDUv?= =?utf-8?B?ZkxIMGp4ZUQ3UFJROHo2bVNMcmJUTUlQckZCWXlaMEVkMGpsY3NraXMzckl0?= =?utf-8?B?dDZmYmlVK1JsWncxNjRUbHh3VHhNRTVtWDV4aWZlRFJMcGlzNjQ4OStZek81?= =?utf-8?B?d0RaZlAzb09EazRTVDFpdmVFUU8zSlYzeVJiV2J2VHVNWkd1L2Z4ZVJaWTZG?= =?utf-8?B?U3kxYTFab21RUVdhL05ONlFxZzgxa1VqSFBXeW1RZDNLR04rTlpEcHRpK0JP?= =?utf-8?B?ZTNQL2dkd0ZzOU5hTVRKdGNaZTBTZ3hqT0RYUlhkZXIxQnlnN2lUNUNwcXU4?= =?utf-8?B?OCs2aERiR2gxQVNFaE83YVdoSXdYS3FaSHM0c1FDVTBPYXNIZUxkL0l5aEd2?= =?utf-8?B?L21DUmowTG9yd0g5WmtyNWtZUXRRWlJta3M2QXRqOXpLRFJEOXUzczE3NDRm?= =?utf-8?B?SDZsWDJCU1ErcERHTVlUNTJicFg2cDB0QldaMkE3ZDRKUlE4cE5PZ1JnNUh5?= =?utf-8?B?OGRqRVJpb08zNjNhRmpEWDZpMUhKZVF4N3ByUmZ2bVpEV0Y1UEpaeEJad29Y?= =?utf-8?B?VnJZYjhTNmg1R3lvM0xZdCs5UW5KTFZWeisxUitHWmdpYVRhWjNSY0VheVNF?= =?utf-8?B?aFRVZGlyeFhpOXlEM3NJWEphK1pkOVcwRGYvZWNGaXNYelBFNWpwdWk0NkR6?= =?utf-8?B?L2EwZlNBNnBtcEpjZVBOWldhV0c2MWdGdldQcGNXWlVHa01tNGlaaHduV2U0?= =?utf-8?B?N1A3V2JTR0daVzRGUzlhUVhkSkoxaWtxSjhhS2pMVlBMdXJ6ZE90OTE3QXBa?= =?utf-8?B?ZUd2ZDFZSDJjdU5MZWdoYkEycGEwb3pLdE85NjhrZ1NRSm1tbmJXY3MwQU1y?= =?utf-8?B?SWp4eTlUWEJPTkk0N0VwVmtUS2VNMjhhWUZJYWxwNVBaQW1VNXNkSGlRajdM?= =?utf-8?B?djJ4SHVlcVFabDRuelVVaXlZZDBCWlZ3MjhKREpPZVh3QS82Q2hFRk8yNSsw?= =?utf-8?B?NWs4bWFuZzZ4Qkw0RlZlakIvRFEzTDdRSVNzL0REUWlVdWwrNk0zN2UxdVFC?= =?utf-8?B?ZXZzVFFpaStOeG01b1M2MnJlVTMyb0FUS0RGNXhnWWJEMTgxMGwvSWZlai9y?= =?utf-8?B?YnFuNWRjVlVvODdSeXJwTFJxdEFNWTEyS1VZYStZdll5SlVPSnhwS3kwRDNn?= =?utf-8?B?Y0tRbnZzYVJ6cHpIcE5TUWhQS1FtcVptUEVsVDF5M3JkVU41dWhtTWY1dFIw?= =?utf-8?Q?yt95UW?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB03.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: 20 Jun 2025 13:00:14.6303 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2f16aa3d-3507-4601-588d-08ddaffa6623 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: BL6PEPF0001AB54.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB9459 On 2025-06-16 04:46, Juergen Gross wrote: > Add the code and data definitions of the final kexec stage. > > Put the code and related data into a dedicated section in order to be > able to copy it to another location. For this reason there must be no > absolute relocations being used in the code or data. > > Being functionally related, add a function for adding a final kexec > action. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk Thanks, Jason From minios-devel-bounces@lists.xenproject.org Fri Jun 20 13:01:27 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Fri, 20 Jun 2025 13:01:27 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1020959.1397068 (Exim 4.92) (envelope-from ) id 1uSbN1-0007RR-FO; Fri, 20 Jun 2025 13:01:27 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1020959.1397068; Fri, 20 Jun 2025 13:01:27 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uSbN1-0007RK-Bp; Fri, 20 Jun 2025 13:01:27 +0000 Received: by outflank-mailman (input) for mailman id 1020959; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Jun 2025 13:01:18.5065 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9dca5c95-6085-4ea6-2423-08ddaffa8c36 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: BL6PEPF0001AB52.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA3PR12MB8440 On 2025-06-16 04:46, Juergen Gross wrote: > With all kexec preparations done, activate the new kernel. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk Thanks, Jason From minios-devel-bounces@lists.xenproject.org Fri Jun 20 21:36:47 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Fri, 20 Jun 2025 21:36:47 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1021265.1397268 (Exim 4.92) (envelope-from ) id 1uSjPf-00031o-Om; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Jun 2025 21:36:29.4390 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c931f501-c159-4e5f-7f7d-08ddb0428491 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: CH3PEPF0000000F.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4155 On 2025-06-19 07:37, Juergen Gross wrote: > Suspend for PVH is doing some crazy stuff with the Xenstore and console > PFNs: > > - In arch_pre_suspend() the PFNs are "translated" to MFNs, even if that > translation is a nop. > - The result is stored via start_info_ptr, which points to a struct > start_info only in case of PV mode. > - After resuming or a cancelled suspend, the PFNs are retrieved again > and "translated". > - The "MFNs" are stored again via start_info_ptr, which is still not > pointing at a struct start_info, and from where the data is never > read again after that. > > Drop all of that completely. > > Signed-off-by: Juergen Gross start_info_ptr points at an hvm_start_info. Assuming I counted properly, accessing ->console/store is writing past the end of the struct. 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bh=HmXWvIjVpphAD0tyUXrdGPKbfnf9wBxPfP67f4xpYTE=; b=hE6L7NJ68Rgagjxcck58qbpH16k06CovDEFGeDTudpCrydQUpUMW3r/gy9ClwDbbollN2FkZUApkcS2ytZA+EN2XV4DEQ5DwKUADfvRksCRngtnQvU7vRv/K2Y8pvOCqRX2HCmffWVWRi2Z58WpHCthVob6hum42Kb/DeQWRzik= X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Message-ID: Date: Fri, 20 Jun 2025 17:38:36 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 2/6] setup: drop parameter from map_shared_info() To: Juergen Gross , , CC: References: <20250619113804.32694-1-jgross@suse.com> <20250619113804.32694-3-jgross@suse.com> Content-Language: en-US From: Jason Andryuk In-Reply-To: <20250619113804.32694-3-jgross@suse.com> Content-Type: text/plain; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Jun 2025 21:38:29.0631 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 36775c8f-fc67-4824-ca3e-08ddb042cbea 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: SJ5PEPF000001CD.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY1PR12MB9626 On 2025-06-19 07:38, Juergen Gross wrote: > The parameter of map_shared_info() is evaluated in PV mode only, and it > is always the pointer to the initial struct start_info from boot time. > > By setting start_info_ptr a little bit earlier the PV variant of > map_shared_info() can just use start_info_ptr instead of a parameter. > > Signed-off-by: Juergen Gross > --- > diff --git a/arch/x86/setup.c b/arch/x86/setup.c > index e30eb065..1bdf9509 100644 > --- a/arch/x86/setup.c > +++ b/arch/x86/setup.c > @@ -185,6 +184,8 @@ arch_init(void *par) > { > static char hello[] = "Bootstrapping...\n"; > > + start_info_ptr = par; Should start_info_ptr only be set for CONFIG_PARAVIRT? Oh, patch 6 does that. Strangely, patch 3 and 6 are not in my inbox. Reviewed-by: Jason Andryuk Regards, Jason > + > hpc_init(); > (void)HYPERVISOR_console_io(CONSOLEIO_write, strlen(hello), hello); > From minios-devel-bounces@lists.xenproject.org Fri Jun 20 21:40:52 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Fri, 20 Jun 2025 21:40:52 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1021294.1397290 (Exim 4.92) (envelope-from ) id 1uSjTg-0005In-Bd; Fri, 20 Jun 2025 21:40:52 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1021294.1397290; Fri, 20 Jun 2025 21:40:52 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uSjTg-0005Ig-97; Fri, 20 Jun 2025 21:40:52 +0000 Received: by outflank-mailman (input) for mailman id 1021294; Fri, 20 Jun 2025 21:40:51 +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 1uSjTf-0005Ia-MG for minios-devel@lists.xenproject.org; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Jun 2025 21:40:42.3656 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c1100c64-8b26-46aa-3766-08ddb0431b51 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: BL02EPF0002992E.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB4152 On 2025-06-19 07:38, Juergen Gross wrote: > Add an extern declaration for start_info_ptr when running in PV mode > and use that instead of the copy held in start_info. This allows to > drop start_info. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Fri Jun 20 21:41:37 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Fri, 20 Jun 2025 21:41:37 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1021306.1397305 (Exim 4.92) (envelope-from ) id 1uSjUP-0005qj-MB; Fri, 20 Jun 2025 21:41:37 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1021306.1397305; Fri, 20 Jun 2025 21:41:37 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uSjUP-0005qb-Il; Fri, 20 Jun 2025 21:41:37 +0000 Received: by outflank-mailman (input) for mailman id 1021306; Fri, 20 Jun 2025 21:41:36 +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 1uSjUO-0005Ia-Fv for minios-devel@lists.xenproject.org; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Jun 2025 21:41:28.7970 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7bd6b741-8939-4cea-091d-08ddb04336fe 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: BL02EPF00029927.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB8789 On 2025-06-19 07:38, Juergen Gross wrote: > The parameter of get_console() is used only when running in PV mode, > and it always has the same value. > > Drop the parameter and use start_info_ptr directly in the PV variant > of get_console(). > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Fri Jun 20 21:42:20 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Fri, 20 Jun 2025 21:42:20 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1021319.1397329 (Exim 4.92) (envelope-from ) id 1uSjV6-0006dy-Ab; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Jun 2025 21:42:08.9330 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 13c15c7c-aefc-416d-9ada-08ddb0434ef8 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: SJ5PEPF000001CE.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV3PR12MB9265 On 2025-06-19 07:38, Juergen Gross wrote: > The parameter of get_xenbus() is used only when running in PV mode, > and it always has the same value. > > Drop the parameter and use start_info_ptr directly in the PV variant > of get_xenbus(). > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Fri Jun 20 21:43:30 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Fri, 20 Jun 2025 21:43:30 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1021333.1397333 (Exim 4.92) (envelope-from ) id 1uSjWE-00074p-FB; 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pr=C Message-ID: Date: Fri, 20 Jun 2025 17:43:27 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 6/6] x86/pv: make start_info_ptr PV-only To: Juergen Gross , , CC: References: <20250619113804.32694-1-jgross@suse.com> <20250619113804.32694-7-jgross@suse.com> Content-Language: en-US From: Jason Andryuk In-Reply-To: <20250619113804.32694-7-jgross@suse.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: None (SATLEXMB03.amd.com: jason.andryuk@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF00002321:EE_|DS7PR12MB5720:EE_ X-MS-Office365-Filtering-Correlation-Id: f10dddd1-7ba3-491b-0d48-08ddb0437996 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?eHRXamtDRmkrQ3dhNllmaW1ZdklFM3B0VVdwRnJraEZkZnNFK3V0Mmo3RW9G?= =?utf-8?B?M0hEbmEyZjlndXhvazY4cURaVUl1NHVNYzNwSzJBcFhWN0hLbUVqZXczRXRv?= =?utf-8?B?Wmp0ZzZOeHNWTDhGeVcxRWYxTERMZG9lNUJTWGdCN1hkVmZuUk5Pc1ltd21U?= =?utf-8?B?dWNzUGVKd25BcU9YT2F5ZTMrTVZkNFN3aWUzRFpjRGZEMEpud1lQZ0RicG16?= =?utf-8?B?VENkWHpQMnBnNVFUWEpNMGc1MGVPRVBQRUlwKzNsY1NCSGFGTzhIVHdFMFNO?= =?utf-8?B?aGd1TUNTdEZRNGN6WE9Nd3RtRHZVc2lCMDVkdlRrNWRRS2lCMWw3N2N1Nm9l?= =?utf-8?B?eUNuLzFVOUR6VFZheHU3cXVCZytWa0t1NmVwSkJRREFMSW9qUjRvcm5Yd3Qr?= =?utf-8?B?MEFJUU42d1dpbEJWZnUweityUGdvR2ZIK3FtSkNCQ0VscDI3MHo0R01JRXoy?= =?utf-8?B?MGVORjFES01RRGFyYi9jZEF4VytSOVlCc0dHS2c1UElQcThUc24wRmYvQ1dw?= =?utf-8?B?U1RvOFVHa0VwRktPdkFsWUV2OGxyYnhYeVBXUVdGYzBlaTdxWXV1eXp5RE5B?= =?utf-8?B?dnBMVFp0Vkd6bXI2VGIzN2hNRDVjcW54YXRzMWhyWFNZeUlna2FGWHZKN3di?= =?utf-8?B?cnVKWWFYM2FTSkJHTTUvSys5bDR3SkkybTVhcjdjN3JISW9tR1JVWlFFZnZm?= =?utf-8?B?enBIemdvOFpNTE55bVRld3RSVzVkaXQvT3gvN0xmeXpJVGh5RDUzWVZ1R3lz?= =?utf-8?B?YmN6SzRzRjNvM0EyL0J0ajFIMDZCTXVxMGI4Z3N2WEhpQzI2ZXFxZVYxUVhI?= =?utf-8?B?SHpzMFF6NDdaOHU2SkdqcWRGVndXcUFmYTEyVVpXbS82bkxmdDJPbXFOSmRl?= =?utf-8?B?NXJkeFUyaUpwTEZZUmg4WldpMlA1bnhqS0crUUp5ZkNyclRBTVhRYURuN2pR?= =?utf-8?B?KzEzUjRHMEkwUnJtWi9TSTY0emlxVWp3N1poNzlvVkJ2WTc5d1V6dFBEMUcr?= =?utf-8?B?SjdTK0N2MEJzRlFNWUp4Y05FczFSWms5dXVDa3ZXU0RaMDZDREtmeTlxZUFM?= =?utf-8?B?K2JleXFSN3lpSmhVVk9ZeGp4MGY4SGNzVWU1dTJLcmlsTzIwcmZIck12Z1dm?= =?utf-8?B?b01UMzliRXVlaWMvVFo1ZlpTeE1BNlNYejIveEtnTWxSeEtndEFTRDdZY240?= =?utf-8?B?ZVVISkhaNjYwRXo5WGF5YS9kcHowQm8zakxCaUZYU2ROSjBaYkxWYU4zMG93?= =?utf-8?B?OEpUMmtBdm9zbzlPbmxQbTVITWhBa2FFMVhZZENUMkQ4TFhOTU5aTy9HTkF6?= =?utf-8?B?UWI4MllUb0daTG5naFBpUVdvWXZDRFgraDUxdzk1ZUZ3OVlMM1JIT3BudlFi?= =?utf-8?B?TUVoTG1MeHo2NTFmbjRvdUhHU3QzQlpqSWFvMzd2TVlBUC9wZWdmT21HM1pO?= =?utf-8?B?TmcwTTFQaitvTWNQVk93TW9BdEdEbE9vSVpNTEVMdzVFRlUyVEdJTEVrcW9j?= =?utf-8?B?QXpJOHJ4SlBvTXlTU1FDMVhTeUhQa2lFT20zcFhvb0hIallCU0JSMThlbnQ5?= =?utf-8?B?SlFpOTBMQVJIekZocWxXZEN0OFFUMmxHZ2ZEUjMrRjlReEk0ZStKdUtzQzJJ?= =?utf-8?B?dU5UNS9xNVlFVG1UanJqR0JHdGZxUVRxajk0RGFMM3RnMHI4OUwzQ2RLTXlO?= =?utf-8?B?SUdYOFAvL3FuYzlST2ltTnBycVpwWkJHSmg3UG1XNmVUYm83YTBZTWdQcEV3?= =?utf-8?B?Zkw4Rm1pcmZKc2d2a3d6NjZMNDBUdWN3OWk2TzZEQnVQWWxsTlU4a3BpaGhu?= =?utf-8?B?RVVUanovblZwQmtsSWxWTmlSb05iRlZjcjFGeW9qNkF5Vk9iN0F6clJNOTIv?= =?utf-8?B?MHg3bC9lYXNWSmJFdEkwemV0NXMxbTZ5MVZEZXBVZFJGZnZxdTNha0pqekJh?= =?utf-8?B?Smd4Vnpva1FIVER2RFQrbzlsZ3RBeDFlZTQ5Tm55UjF0VjhlKzVRVkR6cHdp?= =?utf-8?B?MHJ6akZJb20yeUVqOEI1MzFDZmRCem5mYlNIdjJPdGN4Z1Mwd1lBaU81TlJx?= =?utf-8?Q?EYMaye?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB03.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: 20 Jun 2025 21:43:20.4307 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f10dddd1-7ba3-491b-0d48-08ddb0437996 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: SJ1PEPF00002321.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB5720 On 2025-06-19 07:38, Juergen Gross wrote: > Hide start_info_ptr via CONFIG_PARAVIRT in order to avoid accesses to > it form not PV specific code. > > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk From minios-devel-bounces@lists.xenproject.org Mon Jun 23 08:45:16 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 23 Jun 2025 08:45:16 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1022194.1397947 (Exim 4.92) (envelope-from ) id 1uTcnj-0002UO-Gl; 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Mon, 23 Jun 2025 01:45:12 -0700 (PDT) Message-ID: <00495ca3-55f1-422b-9839-aa54ec42a129@suse.com> Date: Mon, 23 Jun 2025 10:45:05 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 0/6] hide struct start_info from PVH code To: Juergen Gross Cc: samuel.thibault@ens-lyon.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org References: <20250619113804.32694-1-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: <20250619113804.32694-1-jgross@suse.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 19.06.2025 13:37, Juergen Gross wrote: > While working on xenstore-stubdom live update support I came across > some really unpleasant code using struct start_info even when running > in PVH mode. > > Especially suspend/resume was doing some crazy stuff, including > overwriting the initial struct hvm_start_info partially. > > This series is hiding struct start_info from PVH code. This didn't > result in any runtime error, but in future I'll need to access struct > hvm_start_info some time after boot, so I need to get that fixed. > > Tested especially with xl suspend/resume and xl save/restore in PV and > in PVH mode. > > Juergen Gross (6): > suspend: drop crazy pfn handling for PVH > setup: drop parameter from map_shared_info() > x86/pv: remove global start_info > console: drop parameter from get_console() > xenbus: drop parameter from get_xenbus() > x86/pv: make start_info_ptr PV-only Before I even try: Does this series interfere in any way with the kexec one, and hence may need re-basing on top of that (which I've pushed a minute ago)? 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Mon, 23 Jun 2025 01:48:06 -0700 (PDT) Message-ID: <169ca556-0082-4885-bc41-2aa0a61d33b8@suse.com> Date: Mon, 23 Jun 2025 10:48:05 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [MINI-OS PATCH 0/6] hide struct start_info from PVH code To: Jan Beulich Cc: samuel.thibault@ens-lyon.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org References: <20250619113804.32694-1-jgross@suse.com> <00495ca3-55f1-422b-9839-aa54ec42a129@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: <00495ca3-55f1-422b-9839-aa54ec42a129@suse.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------dlbn0Pnb42asKOsf1yWYSuYk" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------dlbn0Pnb42asKOsf1yWYSuYk Content-Type: multipart/mixed; boundary="------------JY1QJSAeC6Dw0xcCXSFBht2V"; 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: <169ca556-0082-4885-bc41-2aa0a61d33b8@suse.com> Subject: Re: [MINI-OS PATCH 0/6] hide struct start_info from PVH code References: <20250619113804.32694-1-jgross@suse.com> <00495ca3-55f1-422b-9839-aa54ec42a129@suse.com> In-Reply-To: <00495ca3-55f1-422b-9839-aa54ec42a129@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= --------------JY1QJSAeC6Dw0xcCXSFBht2V 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/Ey8FAmhZFMUFAwAAAAAACgkQsN6d1ii/Ey+C Vwf8DWzJllBPIxuydOg7UQYXy3Ly+UsQtqzvldp6JxxOYAm+lRNWoYNxkzaG03LSl6wmz/J9EYTS meM1U1PvBohR0kBQGycaBJXb6Sf9+s9oULBdzyjUcv/GUuNU/68CKtVLOV2CrhfE7xfkRh0gU77U Ox/EWJJj3T1shb9uaELgAStDiS5GSF39FHZcmPYMNQBSFg0VOUBXxZlDQDmcAB6ZG+8C611VfxVq jeiXe8VX4Ek64JRzMZ4Zhpw+r/KRKo3Qfo7twHEErSbkmFo3WrL+TC2JaFLwF5NlL7OrgcxW0uUE GLy6ocGpiQFkEGDH6si7Mi9cjTOAHasfkOmxnTMa7w== =ftjf -----END PGP SIGNATURE----- --------------dlbn0Pnb42asKOsf1yWYSuYk-- From minios-devel-bounces@lists.xenproject.org Wed Jun 25 11:14:35 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 25 Jun 2025 11:14:35 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1024739.1400575 (Exim 4.92) (envelope-from ) id 1uUO5J-0008O0-CL; Wed, 25 Jun 2025 11:14:33 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1024739.1400575; 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Fixes: d669a312b2b2 ("x86/pv: remove global start_info") Signed-off-by: Juergen Gross --- arch/x86/setup.c | 1 + include/hypervisor.h | 2 ++ 2 files changed, 3 insertions(+) diff --git a/arch/x86/setup.c b/arch/x86/setup.c index b3fc835a..ed28d940 100644 --- a/arch/x86/setup.c +++ b/arch/x86/setup.c @@ -67,6 +67,7 @@ static inline void sse_init(void) { * This pointer holds a reference to the start_info struct. */ start_info_t *start_info_ptr; +EXPORT_SYMBOL(start_info_ptr); #define hpc_init() diff --git a/include/hypervisor.h b/include/hypervisor.h index f40bc8c3..d199f039 100644 --- a/include/hypervisor.h +++ b/include/hypervisor.h @@ -30,6 +30,8 @@ #ifdef CONFIG_PARAVIRT /* A pointer to the start of day information passed up from the hypervisor. */ extern start_info_t *start_info_ptr; + +#define start_info (*start_info_ptr) #else int hvm_get_parameter(int idx, uint64_t *value); int hvm_set_parameter(int idx, uint64_t value); -- 2.43.0 From minios-devel-bounces@lists.xenproject.org Wed Jun 25 13:27:04 2025 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 25 Jun 2025 13:27:04 +0000 Received: from list by lists.xenproject.org with outflank-mailman.1024883.1400668 (Exim 4.92) (envelope-from ) id 1uUQ9X-00032s-6Q; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Jun 2025 13:26:53.7376 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: abecb1e3-dffb-4c28-a1d0-08ddb3ebf35b 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: SN1PEPF000397B3.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB8214 On 2025-06-25 07:14, Juergen Gross wrote: > grub-pv is relying on start_info being defined, so provide a definition > which can be used. > > Fixes: d669a312b2b2 ("x86/pv: remove global start_info") > Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk