[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Tmem [PATCH 5/5] (Take 3): Build Xen interface under tmem layer
Tmem [PATCH 5/5] (Take 3): Build Xen interface under tmem layer. Interface kernel tmem API to a Xen hypercall implementation of tmem that conforms to the published Transcendent Memory API. Signed-off-by: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> arch/x86/include/asm/xen/hypercall.h | 8 + drivers/xen/Makefile | 1 drivers/xen/tmem.c | 97 +++++++++++++++++++++ include/xen/interface/tmem.h | 43 +++++++++ include/xen/interface/xen.h | 22 ++++ 5 files changed, 171 insertions(+) --- linux-2.6.32/arch/x86/include/asm/xen/hypercall.h 2009-12-02 20:51:21.000000000 -0700 +++ linux-2.6.32-tmem/arch/x86/include/asm/xen/hypercall.h 2009-12-10 11:10:17.000000000 -0700 @@ -45,6 +45,7 @@ #include <xen/interface/xen.h> #include <xen/interface/sched.h> #include <xen/interface/physdev.h> +#include <xen/interface/tmem.h> /* * The hypercall asms have to meet several constraints: @@ -417,6 +418,13 @@ HYPERVISOR_nmi_op(unsigned long op, unsi return _hypercall2(int, nmi_op, op, arg); } +static inline int +HYPERVISOR_tmem_op( + struct tmem_op *op) +{ + return _hypercall1(int, tmem_op, op); +} + static inline void MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set) { --- linux-2.6.32/drivers/xen/Makefile 2009-12-02 20:51:21.000000000 -0700 +++ linux-2.6.32-tmem/drivers/xen/Makefile 2009-12-10 11:10:17.000000000 -0700 @@ -6,6 +6,7 @@ CFLAGS_features.o := $(nostackp) obj-$(CONFIG_HOTPLUG_CPU) += cpu_hotplug.o obj-$(CONFIG_XEN_XENCOMM) += xencomm.o +obj-$(CONFIG_TMEM) += tmem.o obj-$(CONFIG_XEN_BALLOON) += balloon.o obj-$(CONFIG_XEN_DEV_EVTCHN) += evtchn.o obj-$(CONFIG_XENFS) += xenfs/ --- linux-2.6.32/include/xen/interface/tmem.h 1969-12-31 17:00:00.000000000 -0700 +++ linux-2.6.32-tmem/include/xen/interface/tmem.h 2009-12-10 11:10:17.000000000 -0700 @@ -0,0 +1,43 @@ +/* + * include/xen/interface/tmem.h + * + * Interface to Xen implementation of transcendent memory + * + * Copyright (C) 2009 Dan Magenheimer, Oracle Corp. + */ + +#include <xen/interface/xen.h> + +#define TMEM_CONTROL 0 +#define TMEM_NEW_POOL 1 +#define TMEM_DESTROY_POOL 2 +#define TMEM_NEW_PAGE 3 +#define TMEM_PUT_PAGE 4 +#define TMEM_GET_PAGE 5 +#define TMEM_FLUSH_PAGE 6 +#define TMEM_FLUSH_OBJECT 7 +#define TMEM_READ 8 +#define TMEM_WRITE 9 +#define TMEM_XCHG 10 + +/* Subops for HYPERVISOR_tmem_op(TMEM_CONTROL) */ +#define TMEMC_THAW 0 +#define TMEMC_FREEZE 1 +#define TMEMC_FLUSH 2 +#define TMEMC_DESTROY 3 +#define TMEMC_LIST 4 +#define TMEMC_SET_WEIGHT 5 +#define TMEMC_SET_CAP 6 +#define TMEMC_SET_COMPRESS 7 + +/* Bits for HYPERVISOR_tmem_op(TMEM_NEW_POOL) */ +#define TMEM_POOL_PERSIST 1 +#define TMEM_POOL_SHARED 2 +#define TMEM_POOL_PAGESIZE_SHIFT 4 +#define TMEM_POOL_PAGESIZE_MASK 0xf +#define TMEM_POOL_VERSION_SHIFT 24 +#define TMEM_POOL_VERSION_MASK 0xff + +/* Special errno values */ +#define EFROZEN 1000 +#define EEMPTY 1001 --- linux-2.6.32/include/xen/interface/xen.h 2009-12-02 20:51:21.000000000 -0700 +++ linux-2.6.32-tmem/include/xen/interface/xen.h 2009-12-10 11:10:17.000000000 -0700 @@ -58,6 +58,7 @@ #define __HYPERVISOR_event_channel_op 32 #define __HYPERVISOR_physdev_op 33 #define __HYPERVISOR_hvm_op 34 +#define __HYPERVISOR_tmem_op 38 /* Architecture-specific hypercall definitions. */ #define __HYPERVISOR_arch_0 48 @@ -461,6 +462,27 @@ typedef uint8_t xen_domain_handle_t[16]; #define __mk_unsigned_long(x) x ## UL #define mk_unsigned_long(x) __mk_unsigned_long(x) +struct tmem_op { + uint32_t cmd; + int32_t pool_id; + union { + struct { /* for cmd == TMEM_NEW_POOL */ + uint64_t uuid[2]; + uint32_t flags; + } new; + struct { + uint64_t object; + uint32_t index; + uint32_t tmem_offset; + uint32_t pfn_offset; + uint32_t len; + GUEST_HANDLE(void) gmfn; /* guest machine page frame */ + } gen; + } u; +}; +typedef struct tmem_op tmem_op_t; +DEFINE_GUEST_HANDLE_STRUCT(tmem_op_t); + #else /* __ASSEMBLY__ */ /* In assembly code we cannot use C numeric constant suffixes. */ --- linux-2.6.32/drivers/xen/tmem.c 1969-12-31 17:00:00.000000000 -0700 +++ linux-2.6.32-tmem/drivers/xen/tmem.c 2009-12-10 11:10:17.000000000 -0700 @@ -0,0 +1,97 @@ +/* + * Xen implementation for transcendent memory (tmem) + * + * Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> 2009 + */ + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/tmem.h> +#include <xen/interface/xen.h> +#include <xen/interface/tmem.h> +#include <asm/xen/hypercall.h> +#include <asm/xen/page.h> + +static inline int xen_tmem_op(u32 tmem_cmd, u32 tmem_pool, u64 object, + u32 index, unsigned long gmfn, u32 tmem_offset, u32 pfn_offset, u32 len) +{ + struct tmem_op op; + int rc = 0; + + op.cmd = tmem_cmd; + op.pool_id = tmem_pool; + op.u.gen.object = object; + op.u.gen.index = index; + op.u.gen.tmem_offset = tmem_offset; + op.u.gen.pfn_offset = pfn_offset; + op.u.gen.len = len; + set_xen_guest_handle(op.u.gen.gmfn, (void *)gmfn); + rc = HYPERVISOR_tmem_op(&op); + return rc; +} + +static int xen_tmem_new_pool(struct tmem_pool_uuid uuid, u32 flags) +{ + struct tmem_op op; + int rc = 0; + + flags |= (PAGE_SHIFT - 12) << TMEM_POOL_PAGESIZE_SHIFT; + op.cmd = TMEM_NEW_POOL; + op.u.new.uuid[0] = uuid.uuid_lo; + op.u.new.uuid[1] = uuid.uuid_hi; + op.u.new.flags = flags; + rc = HYPERVISOR_tmem_op(&op); + return rc; +} + +static int xen_tmem_put_page(u32 pool_id, u64 object, u32 index, + unsigned long pfn) +{ + unsigned long gmfn = pfn_to_mfn(pfn); + + return xen_tmem_op(TMEM_PUT_PAGE, pool_id, object, index, + gmfn, 0, 0, 0); +} + +static int xen_tmem_get_page(u32 pool_id, u64 object, u32 index, + unsigned long pfn) +{ + unsigned long gmfn = pfn_to_mfn(pfn); + + return xen_tmem_op(TMEM_GET_PAGE, pool_id, object, index, + gmfn, 0, 0, 0); +} + +static int xen_tmem_flush_page(u32 pool_id, u64 object, u32 index) +{ + return xen_tmem_op(TMEM_FLUSH_PAGE, pool_id, object, index, + 0, 0, 0, 0); +} + +static int xen_tmem_flush_object(u32 pool_id, u64 object) +{ + return xen_tmem_op(TMEM_FLUSH_OBJECT, pool_id, object, 0, 0, 0, 0, 0); +} + +static int xen_tmem_destroy_pool(u32 pool_id) +{ + return xen_tmem_op(TMEM_DESTROY_POOL, pool_id, 0, 0, 0, 0, 0, 0); +} + +static struct tmem_ops xen_tmem_ops = { + .new_pool = xen_tmem_new_pool, + .put_page = xen_tmem_put_page, + .get_page = xen_tmem_get_page, + .flush_page = xen_tmem_flush_page, + .flush_object = xen_tmem_flush_object, + .destroy_pool = xen_tmem_destroy_pool +}; + +static int __init xen_tmem_init(void) +{ + tmem_set_ops(&xen_tmem_ops); + return 0; +} +core_initcall(xen_tmem_init); _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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