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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 05/22] Introduce support for version 2 grant tables. Use them by default when available.
This doesn't include any of the new features, like copy grants or
transitive grants, but it does include most of the V2 infrastructure.
Signed-off-by: Steven Smith <steven.smith@xxxxxxxxxx>
---
drivers/xen/core/gnttab.c | 296 ++++++++++++++++++++++++++++------
include/xen/interface/grant_table.h | 131 +++++++++++++++-
2 files changed, 368 insertions(+), 59 deletions(-)
diff --git a/drivers/xen/core/gnttab.c b/drivers/xen/core/gnttab.c
index dd93f43..5484e7e 100644
--- a/drivers/xen/core/gnttab.c
+++ b/drivers/xen/core/gnttab.c
@@ -53,7 +53,9 @@
/* External tools reserve first few grant table entries. */
#define NR_RESERVED_ENTRIES 8
#define GNTTAB_LIST_END 0xffffffff
-#define ENTRIES_PER_GRANT_FRAME (PAGE_SIZE / sizeof(grant_entry_t))
+#define ENTRIES_PER_GRANT_FRAME (grant_table_version == 1 ? \
+ (PAGE_SIZE / sizeof(grant_entry_v1_t)) : \
+ (PAGE_SIZE / sizeof(grant_entry_v2_t)))
static void pending_free_timer(unsigned long ignore);
@@ -68,10 +70,18 @@ static DEFINE_TIMER(gnttab_delayed_free_timer,
pending_free_timer, 0, 0);
static DEFINE_SPINLOCK(gnttab_pending_free_lock);
static DEFINE_SPINLOCK(gnttab_list_lock);
-static struct grant_entry *shared;
+static union {
+ grant_entry_v1_t *v1;
+ grant_entry_v2_t *v2;
+ void *raw;
+} shared;
+
+static grant_status_t *grstatus;
static struct gnttab_free_callback *gnttab_free_callback_list;
+static int grant_table_version;
+
static int gnttab_expand(unsigned int req_entries);
#define RPP (PAGE_SIZE / sizeof(grant_ref_t))
@@ -80,6 +90,11 @@ static int gnttab_expand(unsigned int req_entries);
#define nr_freelist_frames(grant_frames) \
(((grant_frames) * ENTRIES_PER_GRANT_FRAME + RPP - 1) / RPP)
+#define SPP (PAGE_SIZE / sizeof(grant_status_t))
+#define nr_status_frames(grant_frames) \
+ (((grant_frames) * ENTRIES_PER_GRANT_FRAME + SPP - 1) / SPP)
+
+
static int get_free_entries(int count)
{
unsigned long flags;
@@ -167,11 +182,19 @@ EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access);
void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
unsigned long frame, int flags)
{
- shared[ref].frame = frame;
- shared[ref].domid = domid;
- wmb();
- BUG_ON(flags & (GTF_accept_transfer | GTF_reading | GTF_writing));
- shared[ref].flags = GTF_permit_access | flags;
+ BUG_ON(flags & (GTF_accept_transfer | GTF_reading |
+ GTF_writing | GTF_sub_page));
+ if (grant_table_version == 1) {
+ shared.v1[ref].frame = frame;
+ shared.v1[ref].domid = domid;
+ wmb();
+ shared.v1[ref].flags = GTF_permit_access | flags;
+ } else {
+ shared.v2[ref].frame = frame;
+ shared.v2[ref].hdr.domid = domid;
+ wmb();
+ shared.v2[ref].hdr.flags = GTF_permit_access | flags;
+ }
}
EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_ref);
@@ -180,7 +203,10 @@ int gnttab_query_foreign_access(grant_ref_t ref)
{
u16 nflags;
- nflags = shared[ref].flags;
+ if (grant_table_version == 1)
+ nflags = shared.v1[ref].flags;
+ else
+ nflags = grstatus[ref];
return (nflags & (GTF_reading|GTF_writing));
}
@@ -189,29 +215,48 @@ EXPORT_SYMBOL_GPL(gnttab_query_foreign_access);
static int _gnttab_end_foreign_access_ref(grant_ref_t ref)
{
u16 flags, nflags;
-
- nflags = shared[ref].flags;
- do {
- if ((flags = nflags) & (GTF_reading|GTF_writing)) {
- printk(KERN_DEBUG "WARNING: g.e. still in use!\n");
+ u16 *pflags;
+
+ if (grant_table_version == 1) {
+ pflags = &shared.v1[ref].flags;
+ nflags = *pflags;
+ do {
+ if ((flags = nflags) & (GTF_reading|GTF_writing)) {
+ return 0;
+ }
+ } while ((nflags = synch_cmpxchg_subword(pflags, flags, 0)) !=
+ flags);
+ return 1;
+ } else {
+ shared.v2[ref].hdr.flags = 0;
+ mb();
+ if (grstatus[ref] & (GTF_reading|GTF_writing)) {
return 0;
+ } else {
+ /* The read of grstatus needs to have acquire
+ semantics. On x86, reads already have
+ that, and we just need to protect against
+ compiler reorderings. On other
+ architectures we may need a full
+ barrier. */
+#ifdef CONFIG_X86
+ barrier();
+#else
+ mb();
+#endif
+ return 1;
}
- } while ((nflags = synch_cmpxchg_subword(&shared[ref].flags, flags, 0))
!=
- flags);
-
- return 1;
+ }
}
-int gnttab_end_foreign_access_ref(grant_ref_t ref)
+int gnttab_end_foreign_access_ref(grant_ref_t gref)
{
- int r;
-
- r = _gnttab_end_foreign_access_ref(ref);
- if (!r)
+ int res;
+ res = _gnttab_end_foreign_access_ref(gref);
+ if (res == 0)
printk(KERN_DEBUG "WARNING: g.e. still in use!\n");
- return r;
+ return res;
}
-
EXPORT_SYMBOL_GPL(gnttab_end_foreign_access_ref);
static void pending_free_timer(unsigned long ignore)
@@ -315,37 +360,53 @@ EXPORT_SYMBOL_GPL(gnttab_grant_foreign_transfer);
void gnttab_grant_foreign_transfer_ref(grant_ref_t ref, domid_t domid,
unsigned long pfn)
{
- shared[ref].frame = pfn;
- shared[ref].domid = domid;
- wmb();
- shared[ref].flags = GTF_accept_transfer;
+ if (grant_table_version == 1) {
+ shared.v1[ref].frame = pfn;
+ shared.v1[ref].domid = domid;
+ wmb();
+ shared.v1[ref].flags = GTF_accept_transfer;
+ } else {
+ shared.v2[ref].frame = pfn;
+ shared.v2[ref].hdr.domid = domid;
+ wmb();
+ shared.v2[ref].hdr.flags = GTF_accept_transfer;
+ }
}
EXPORT_SYMBOL_GPL(gnttab_grant_foreign_transfer_ref);
unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref)
{
unsigned long frame;
- u16 flags;
+ u16 flags;
+ u16 *pflags;
+
+ if (grant_table_version == 1)
+ pflags = &shared.v1[ref].flags;
+ else
+ pflags = &shared.v2[ref].hdr.flags;
/*
* If a transfer is not even yet started, try to reclaim the grant
* reference and return failure (== 0).
*/
- while (!((flags = shared[ref].flags) & GTF_transfer_committed)) {
- if (synch_cmpxchg_subword(&shared[ref].flags, flags, 0) ==
flags)
+ while (!((flags = *pflags) & GTF_transfer_committed)) {
+ if (synch_cmpxchg_subword(pflags, flags, 0) == flags)
return 0;
cpu_relax();
}
/* If a transfer is in progress then wait until it is completed. */
while (!(flags & GTF_transfer_completed)) {
- flags = shared[ref].flags;
+ flags = *pflags;
cpu_relax();
}
/* Read the frame number /after/ reading completion status. */
rmb();
- frame = shared[ref].frame;
+ if (grant_table_version == 1)
+ frame = shared.v1[ref].frame;
+ else
+ frame = shared.v2[ref].frame;
BUG_ON(frame == 0);
return frame;
@@ -519,6 +580,30 @@ static inline unsigned int max_nr_grant_frames(void)
return xen_max;
}
+static void gnttab_request_version(void)
+{
+ int rc;
+ struct gnttab_set_version gsv;
+
+ gsv.version = 2;
+ rc = HYPERVISOR_grant_table_op(GNTTABOP_set_version, &gsv, 1);
+ if (rc == 0) {
+ grant_table_version = 2;
+ printk(KERN_NOTICE "Using V2 grant tables.\n");
+ } else {
+ if (grant_table_version == 2) {
+ /* If we've already used version 2 features,
+ but then suddenly discover that they're not
+ available (e.g. migrating to an older
+ version of Xen), almost unbounded badness
+ can happen. */
+ panic("we need grant tables version 2, but only version
1 is available");
+ }
+ grant_table_version = 1;
+ printk(KERN_WARNING "Using legacy V1 grant tables; upgrade to a
newer version of Xen.\n");
+ }
+}
+
#ifdef CONFIG_XEN
static DEFINE_SEQLOCK(gnttab_dma_lock);
@@ -534,6 +619,16 @@ static int map_pte_fn(pte_t *pte, struct page *pmd_page,
return 0;
}
+static int map_pte_fn_status(pte_t *pte, struct page *pmd_page,
+ unsigned long addr, void *data)
+{
+ uint64_t **frames = (uint64_t **)data;
+
+ set_pte_at(&init_mm, addr, pte, pfn_pte_ma((*frames)[0], PAGE_KERNEL));
+ (*frames)++;
+ return 0;
+}
+
#ifdef CONFIG_PM_SLEEP
static int unmap_pte_fn(pte_t *pte, struct page *pmd_page,
unsigned long addr, void *data)
@@ -551,43 +646,95 @@ void *arch_gnttab_alloc_shared(unsigned long *frames)
BUG_ON(area == NULL);
return area->addr;
}
+
+void *arch_gnttab_alloc_status(uint64_t *frames)
+{
+ struct vm_struct *area;
+ area = alloc_vm_area(PAGE_SIZE *
+ nr_status_frames(boot_max_nr_grant_frames));
+ BUG_ON(area == NULL);
+ return area->addr;
+}
#endif /* CONFIG_X86 */
static int gnttab_map(unsigned int start_idx, unsigned int end_idx)
{
struct gnttab_setup_table setup;
- unsigned long *frames;
+ unsigned long *gframes;
+ uint64_t *sframes;
unsigned int nr_gframes = end_idx + 1;
+ unsigned int nr_sframes;
int rc;
- frames = kmalloc(nr_gframes * sizeof(unsigned long), GFP_ATOMIC);
- if (!frames)
+ BUG_ON(grant_table_version == 0);
+
+ gframes = kmalloc(nr_gframes * sizeof(unsigned long), GFP_ATOMIC);
+ if (!gframes)
return -ENOMEM;
- setup.dom = DOMID_SELF;
- setup.nr_frames = nr_gframes;
- set_xen_guest_handle(setup.frame_list, frames);
+ setup.dom = DOMID_SELF;
+ setup.nr_frames = nr_gframes;
+ set_xen_guest_handle(setup.frame_list, gframes);
rc = HYPERVISOR_grant_table_op(GNTTABOP_setup_table, &setup, 1);
if (rc == -ENOSYS) {
- kfree(frames);
+ kfree(gframes);
return -ENOSYS;
}
BUG_ON(rc || setup.status);
- if (shared == NULL)
- shared = arch_gnttab_alloc_shared(frames);
+ if (shared.raw == NULL)
+ shared.raw = arch_gnttab_alloc_shared(gframes);
+
+ if (grant_table_version > 1) {
+ struct gnttab_get_status_frames getframes;
+
+ nr_sframes= nr_status_frames(nr_gframes);
+
+ sframes = kmalloc(nr_sframes * sizeof(uint64_t),
+ GFP_ATOMIC);
+ if (!sframes) {
+ kfree(gframes);
+ return -ENOMEM;
+ }
+ getframes.dom = DOMID_SELF;
+ getframes.nr_frames = nr_sframes;
+ getframes.frame_list = (unsigned long)sframes;
+
+ rc = HYPERVISOR_grant_table_op(GNTTABOP_get_status_frames,
+ &getframes, 1);
+ if (rc == -ENOSYS) {
+ kfree(gframes);
+ kfree(sframes);
+ return -ENOSYS;
+ }
+
+ BUG_ON(rc || getframes.status);
+
+ if (grstatus == NULL)
+ grstatus = arch_gnttab_alloc_status(sframes);
+ }
#ifdef CONFIG_X86
- rc = apply_to_page_range(&init_mm, (unsigned long)shared,
+ rc = apply_to_page_range(&init_mm, (unsigned long)shared.raw,
PAGE_SIZE * nr_gframes,
- map_pte_fn, &frames);
+ map_pte_fn, &gframes);
BUG_ON(rc);
- frames -= nr_gframes; /* adjust after map_pte_fn() */
+ gframes -= nr_gframes; /* adjust after map_pte_fn() */
+
+ if (grant_table_version > 1) {
+ rc = apply_to_page_range(&init_mm, (unsigned long)grstatus,
+ PAGE_SIZE * nr_sframes,
+ map_pte_fn_status, &sframes);
+ BUG_ON(rc);
+ sframes -= nr_sframes; /* adjust after map_pte_fn() */
+ }
#endif /* CONFIG_X86 */
- kfree(frames);
+ kfree(gframes);
+ if (grant_table_version > 1)
+ kfree(sframes);
return 0;
}
@@ -794,6 +941,7 @@ EXPORT_SYMBOL(gnttab_post_map_adjust);
static int gnttab_resume(struct sys_device *dev)
{
+ gnttab_request_version();
if (max_nr_grant_frames() < nr_grant_frames)
return -ENOSYS;
return gnttab_map(0, nr_grant_frames - 1);
@@ -804,9 +952,12 @@ static int gnttab_resume(struct sys_device *dev)
#ifdef CONFIG_X86
static int gnttab_suspend(struct sys_device *dev, pm_message_t state)
{
- apply_to_page_range(&init_mm, (unsigned long)shared,
+ apply_to_page_range(&init_mm, (unsigned long)shared.raw,
PAGE_SIZE * nr_grant_frames,
unmap_pte_fn, NULL);
+ apply_to_page_range(&init_mm, (unsigned long)grstatus,
+ PAGE_SIZE * nr_status_frames(nr_grant_frames),
+ unmap_pte_fn, NULL);
return 0;
}
#else
@@ -829,7 +980,8 @@ static struct sys_device device_gnttab = {
#include <platform-pci.h>
-static unsigned long resume_frames;
+static unsigned long resume_frames_gnttab;
+static unsigned long resume_frames_status;
static int gnttab_map(unsigned int start_idx, unsigned int end_idx)
{
@@ -843,7 +995,24 @@ static int gnttab_map(unsigned int start_idx, unsigned int
end_idx)
xatp.domid = DOMID_SELF;
xatp.idx = i;
xatp.space = XENMAPSPACE_grant_table;
- xatp.gpfn = (resume_frames >> PAGE_SHIFT) + i;
+ xatp.gpfn = (resume_frames_gnttab >> PAGE_SHIFT) + i;
+ if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
+ BUG();
+ } while (i-- > start_idx);
+
+ return 0;
+}
+
+static int gnttab_map_status(unsigned int start_idx, unsigned int end_idx)
+{
+ struct xen_add_to_physmap xatp;
+ unsigned int i = end_idx;
+
+ do {
+ xatp.domid = DOMID_SELF;
+ xatp.idx = i | XENMAPIDX_grant_table_status;
+ xatp.space = XENMAPSPACE_grant_table;
+ xatp.gpfn = (resume_frames_status >> PAGE_SHIFT) + i;
if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
BUG();
} while (i-- > start_idx);
@@ -854,16 +1023,21 @@ static int gnttab_map(unsigned int start_idx, unsigned
int end_idx)
int gnttab_resume(void)
{
unsigned int max_nr_gframes, nr_gframes;
+ unsigned int max_nr_sframes, nr_sframes;
+
+ gnttab_request_version();
nr_gframes = nr_grant_frames;
max_nr_gframes = max_nr_grant_frames();
if (max_nr_gframes < nr_gframes)
return -ENOSYS;
- if (!resume_frames) {
- resume_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes);
- shared = ioremap(resume_frames, PAGE_SIZE * max_nr_gframes);
- if (shared == NULL) {
+ if (!resume_frames_gnttab) {
+ resume_frames_gnttab =
+ alloc_xen_mmio(PAGE_SIZE * max_nr_gframes);
+ shared.raw = ioremap(resume_frames_gnttab,
+ PAGE_SIZE * max_nr_gframes);
+ if (shared.raw == NULL) {
printk("error to ioremap gnttab share frames\n");
return -1;
}
@@ -871,6 +1045,22 @@ int gnttab_resume(void)
gnttab_map(0, nr_gframes - 1);
+ if (grant_table_version > 1) {
+ nr_sframes = nr_status_frames(nr_gframes);
+ max_nr_sframes = nr_status_frames(max_nr_gframes);
+ if (!resume_frames_status) {
+ resume_frames_status =
+ alloc_xen_mmio(PAGE_SIZE * max_nr_sframes);
+ grstatus = ioremap(resume_frames_status,
+ PAGE_SIZE * max_nr_sframes);
+ if (grstatus == NULL) {
+ printk("error ioremap()ing gnttab status
frames\n");
+ return -1;
+ }
+ }
+
+ gnttab_map_status(0, nr_sframes - 1);
+ }
return 0;
}
diff --git a/include/xen/interface/grant_table.h
b/include/xen/interface/grant_table.h
index c5c2044..1c3a7c7 100644
--- a/include/xen/interface/grant_table.h
+++ b/include/xen/interface/grant_table.h
@@ -84,12 +84,22 @@
*/
/*
+ * Reference to a grant entry in a specified domain's grant table.
+ */
+typedef uint32_t grant_ref_t;
+
+/*
* A grant table comprises a packed array of grant entries in one or more
* page frames shared between Xen and a guest.
* [XEN]: This field is written by Xen and read by the sharing guest.
* [GST]: This field is written by the guest and read by Xen.
*/
-struct grant_entry {
+
+/*
+ * Version 1 of the grant table entry structure is maintained purely
+ * for backwards compatibility. New guests should use version 2.
+ */
+struct grant_entry_v1 {
/* GTF_xxx: various type and flag information. [XEN,GST] */
uint16_t flags;
/* The domain being granted foreign privileges. [GST] */
@@ -100,7 +110,7 @@ struct grant_entry {
*/
uint32_t frame;
};
-typedef struct grant_entry grant_entry_t;
+typedef struct grant_entry_v1 grant_entry_v1_t;
/*
* Type of grant entry.
@@ -108,10 +118,13 @@ typedef struct grant_entry grant_entry_t;
* GTF_permit_access: Allow @domid to map/access @frame.
* GTF_accept_transfer: Allow @domid to transfer ownership of one page frame
* to this guest. Xen writes the page number to @frame.
+ * GTF_transitive: Allow @domid to transitively access a subrange of
+ * @trans_grant in @trans_domid. No mappings are allowed.
*/
#define GTF_invalid (0U<<0)
#define GTF_permit_access (1U<<0)
#define GTF_accept_transfer (2U<<0)
+#define GTF_transitive (3U<<0)
#define GTF_type_mask (3U<<0)
/*
@@ -120,6 +133,9 @@ typedef struct grant_entry grant_entry_t;
* GTF_reading: Grant entry is currently mapped for reading by @domid. [XEN]
* GTF_writing: Grant entry is currently mapped for writing by @domid. [XEN]
* GTF_PAT, GTF_PWT, GTF_PCD: (x86) cache attribute flags for the grant [GST]
+ * GTF_sub_page: Grant access to only a subrange of the page. @domid
+ * will only be allowed to copy from the grant, and not
+ * map it. [GST]
*/
#define _GTF_readonly (2)
#define GTF_readonly (1U<<_GTF_readonly)
@@ -133,6 +149,8 @@ typedef struct grant_entry grant_entry_t;
#define GTF_PCD (1U<<_GTF_PCD)
#define _GTF_PAT (7)
#define GTF_PAT (1U<<_GTF_PAT)
+#define _GTF_sub_page (8)
+#define GTF_sub_page (1U<<_GTF_sub_page)
/*
* Subflags for GTF_accept_transfer:
@@ -149,15 +167,76 @@ typedef struct grant_entry grant_entry_t;
#define _GTF_transfer_completed (3)
#define GTF_transfer_completed (1U<<_GTF_transfer_completed)
+/*
+ * Version 2 grant table entries. These fulfil the same role as
+ * version 1 entries, but can represent more complicated operations.
+ * Any given domain will have either a version 1 or a version 2 table,
+ * and every entry in the table will be the same version.
+ *
+ * The interface by which domains use grant references does not depend
+ * on the grant table version in use by the other domain.
+ */
-/***********************************
- * GRANT TABLE QUERIES AND USES
+/*
+ * Version 1 and version 2 grant entries share a common prefix. The
+ * fields of the prefix are documented as part of struct
+ * grant_entry_v1.
*/
+struct grant_entry_header {
+ uint16_t flags;
+ domid_t domid;
+};
+typedef struct grant_entry_header grant_entry_header_t;
/*
- * Reference to a grant entry in a specified domain's grant table.
+ * Version 2 of the grant entry structure.
+ */
+struct grant_entry_v2 {
+ grant_entry_header_t hdr;
+ union {
+ /*
+ * The frame to which we are granting access. This field has
+ * the same meaning as the grant_entry_v1 field of the same
+ * name.
+ */
+ uint32_t frame;
+
+ /*
+ * If the grant type is GTF_grant_access and GTF_sub_page is
+ * set, @domid is allowed to access bytes
+ * [@page_off,@page_off+@length) in frame @frame.
+ */
+ struct {
+ uint32_t frame;
+ uint16_t page_off;
+ uint16_t length;
+ } sub_page;
+
+ /*
+ * If the grant is GTF_transitive, @domid is allowed to use
+ * the grant @gref in domain @trans_domid, as if it was the
+ * local domain. Obviously, the transitive access must be
+ * compatible with the original grant.
+ *
+ * The current version of Xen does not allow transitive grants
+ * to be mapped.
+ */
+ struct {
+ domid_t trans_domid;
+ uint16_t pad0;
+ grant_ref_t gref;
+ } transitive;
+
+ uint32_t __spacer[3]; /* Pad to a power of two */
+ };
+};
+typedef struct grant_entry_v2 grant_entry_v2_t;
+
+typedef uint16_t grant_status_t;
+
+/***********************************
+ * GRANT TABLE QUERIES AND USES
*/
-typedef uint32_t grant_ref_t;
/*
* Handle to track a mapping created via a grant reference.
@@ -365,6 +444,46 @@ struct gnttab_unmap_and_replace {
typedef struct gnttab_unmap_and_replace gnttab_unmap_and_replace_t;
DEFINE_XEN_GUEST_HANDLE(gnttab_unmap_and_replace_t);
+/*
+ * GNTTABOP_set_version: Request a particular version of the grant
+ * table shared table structure. This operation can only be performed
+ * once in any given domain. It must be performed before any grants
+ * are activated; otherwise, the domain will be stuck with version 1.
+ * The only defined versions are 1 and 2.
+ */
+#define GNTTABOP_set_version 8
+struct gnttab_set_version {
+ /* IN parameters */
+ uint32_t version;
+};
+DEFINE_XEN_GUEST_HANDLE_STRUCT(gnttab_set_version);
+typedef struct gnttab_set_version gnttab_set_version_t;
+DEFINE_XEN_GUEST_HANDLE(gnttab_set_version_t);
+
+/*
+ * GNTTABOP_get_status_frames: Get the list of frames used to store grant
+ * status for <dom>. In grant format version 2, the status is separated
+ * from the other shared grant fields to allow more efficient synchronization
+ * using barriers instead of atomic cmpexch operations.
+ * <nr_frames> specify the size of vector <frame_list>.
+ * The frame addresses are returned in the <frame_list>.
+ * Only <nr_frames> addresses are returned, even if the table is larger.
+ * NOTES:
+ * 1. <dom> may be specified as DOMID_SELF.
+ * 2. Only a sufficiently-privileged domain may specify <dom> != DOMID_SELF.
+ */
+#define GNTTABOP_get_status_frames 9
+struct gnttab_get_status_frames {
+ /* IN parameters. */
+ uint32_t nr_frames;
+ domid_t dom;
+ /* OUT parameters. */
+ int16_t status; /* GNTST_* */
+ uint64_t frame_list;
+};
+DEFINE_XEN_GUEST_HANDLE_STRUCT(gnttab_get_status_frames);
+typedef struct gnttab_get_status_frames gnttab_get_status_frames_t;
+DEFINE_XEN_GUEST_HANDLE(gnttab_get_status_frames_t);
/*
* Bitfield values for gnttab_map_grant_ref.flags.
--
1.6.3.1
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