# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1276158916 -3600
# Node ID 6c3d8aec202d47668bf7f33e53921d7f4444b8a3
# Parent b522d6148f445c2da41d5a5dee1e20a14a2d13f8
xc_domain_restore: Revert 20126:442bc6f82cf3, 19639:205b1badbcfd
This disables superpage restore support, but should gain us acceptable
performance when restoring a domain using a pv_ops dom0 kernel. This
is because single-page allocations will be batched rather than issued
singly.
Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
tools/libxc/xc_domain_restore.c | 549 ++++++++--------------------------------
1 files changed, 120 insertions(+), 429 deletions(-)
diff -r b522d6148f44 -r 6c3d8aec202d tools/libxc/xc_domain_restore.c
--- a/tools/libxc/xc_domain_restore.c Thu Jun 10 08:31:36 2010 +0100
+++ b/tools/libxc/xc_domain_restore.c Thu Jun 10 09:35:16 2010 +0100
@@ -39,408 +39,9 @@ struct restore_ctx {
unsigned long nr_pfns; /* number of 'in use' pfns in the guest (i.e. #P2M
entries with a valid mfn) */
xen_pfn_t *live_p2m; /* Live mapping of the table mapping each PFN to its
current MFN. */
xen_pfn_t *p2m; /* A table mapping each PFN to its new MFN. */
- unsigned no_superpage_mem; /* If have enough continuous memory for super
page allocation */
+ xen_pfn_t *p2m_batch; /* A table of P2M mappings in the current region. */
struct domain_info_context dinfo;
};
-
-/*
-**
-**
-*/
-#define SUPERPAGE_PFN_SHIFT 9
-#define SUPERPAGE_NR_PFNS (1UL << SUPERPAGE_PFN_SHIFT)
-
-/*
- * Setting bit 31 force to allocate super page even not all pfns come out,
- * bit 30 indicate that not is in a super page tracking.
- */
-#define FORCE_SP_SHIFT 31
-#define FORCE_SP_MASK (1UL << FORCE_SP_SHIFT)
-
-#define INVALID_SUPER_PAGE ((1UL << 30) + 1)
-#define SUPER_PAGE_START(pfn) (((pfn) & (SUPERPAGE_NR_PFNS-1)) == 0 )
-#define SUPER_PAGE_TRACKING(pfn) ( (pfn) != INVALID_SUPER_PAGE )
-#define SUPER_PAGE_DONE(pfn) ( SUPER_PAGE_START(pfn) )
-
-static int super_page_populated(xc_interface *xch,
- struct restore_ctx *ctx, unsigned long pfn)
-{
- int i;
- pfn &= ~(SUPERPAGE_NR_PFNS - 1);
- for ( i = pfn; i < pfn + SUPERPAGE_NR_PFNS; i++ )
- {
- if ( ctx->p2m[i] != INVALID_P2M_ENTRY )
- return 1;
- }
- return 0;
-}
-
-/*
- * Break a 2M page and move contents of [extent start, next_pfn-1] to
- * some new allocated 4K pages
- */
-static int break_super_page(xc_interface *xch,
- uint32_t dom,
- struct restore_ctx *ctx,
- xen_pfn_t next_pfn)
-{
- xen_pfn_t *page_array, start_pfn, mfn;
- uint8_t *ram_base, *save_buf;
- unsigned long i;
- int tot_pfns, rc = 0;
-
- tot_pfns = (next_pfn & (SUPERPAGE_NR_PFNS - 1));
-
- start_pfn = next_pfn & ~(SUPERPAGE_NR_PFNS - 1);
- for ( i = start_pfn; i < start_pfn + SUPERPAGE_NR_PFNS; i++ )
- {
- /* check the 2M page are populated */
- if ( ctx->p2m[i] == INVALID_P2M_ENTRY ) {
- DPRINTF("Previous super page was populated wrongly!\n");
- return 1;
- }
- }
-
- page_array = (xen_pfn_t*)malloc(tot_pfns * sizeof(xen_pfn_t));
- save_buf = (uint8_t*)malloc(tot_pfns * PAGE_SIZE);
-
- if ( !page_array || !save_buf )
- {
- ERROR("alloc page_array failed\n");
- errno = ENOMEM;
- rc = 1;
- goto out;
- }
-
- /* save previous super page contents */
- for ( i = 0; i < tot_pfns; i++ )
- {
- /* only support HVM, as the mfn of the 2M page is missing */
- page_array[i] = start_pfn + i;
- }
-
- ram_base = xc_map_foreign_pages(xch, dom, PROT_READ,
- page_array, tot_pfns);
-
- if ( ram_base == NULL )
- {
- PERROR("map batch failed");
- rc = 1;
- goto out;
- }
-
- memcpy(save_buf, ram_base, tot_pfns * PAGE_SIZE);
- munmap(ram_base, tot_pfns * PAGE_SIZE);
-
- /* free the super page */
- if ( xc_domain_memory_decrease_reservation(xch, dom, 1,
- SUPERPAGE_PFN_SHIFT, &start_pfn) != 0 )
- {
- PERROR("free 2M page failure @ 0x%ld.", next_pfn);
- rc = 1;
- goto out;
- }
-
- start_pfn = next_pfn & ~(SUPERPAGE_NR_PFNS - 1);
- for ( i = start_pfn; i < start_pfn + SUPERPAGE_NR_PFNS; i++ )
- {
- ctx->p2m[i] = INVALID_P2M_ENTRY;
- }
-
- for ( i = start_pfn; i < start_pfn + tot_pfns; i++ )
- {
- mfn = i;
- if (xc_domain_memory_populate_physmap(xch, dom, 1, 0,
- 0, &mfn) != 0)
- {
- PERROR("Failed to allocate physical memory.!");
- errno = ENOMEM;
- rc = 1;
- goto out;
- }
- ctx->p2m[i] = mfn;
- }
-
- /* restore contents */
- for ( i = 0; i < tot_pfns; i++ )
- {
- page_array[i] = start_pfn + i;
- }
-
- ram_base = xc_map_foreign_pages(xch, dom, PROT_WRITE,
- page_array, tot_pfns);
- if ( ram_base == NULL )
- {
- PERROR("map batch failed");
- rc = 1;
- goto out;
- }
-
- memcpy(ram_base, save_buf, tot_pfns * PAGE_SIZE);
- munmap(ram_base, tot_pfns * PAGE_SIZE);
-
-out:
- free(page_array);
- free(save_buf);
- return rc;
-}
-
-
-/*
- * According to pfn list allocate pages: one 2M page or series of 4K pages.
- * Also optimistically allocate a 2M page even when not all pages in the 2M
- * extent come out, and fix it up in next batch:
- * If new pages fit the missing one in the 2M extent, do nothing; Else take
- * place of the original 2M page by some 4K pages.
- */
-static int allocate_mfn_list(xc_interface *xch,
- uint32_t dom,
- struct restore_ctx *ctx,
- unsigned long nr_extents,
- xen_pfn_t *batch_buf,
- xen_pfn_t *next_pfn,
- int superpages)
-{
- unsigned int i;
- unsigned long mfn, pfn, sp_pfn;
-
- /*Check if force super page, then clear it */
- unsigned force_super_page = !!(*next_pfn & FORCE_SP_MASK);
- *next_pfn &= ~FORCE_SP_MASK;
-
- sp_pfn = *next_pfn;
-
- if ( !superpages ||
- ctx->no_superpage_mem ||
- !SUPER_PAGE_TRACKING(sp_pfn) )
- goto normal_page;
-
- if ( !batch_buf )
- {
- /* Break previous 2M page, if 512 pages split across a batch boundary
*/
- if ( SUPER_PAGE_TRACKING(sp_pfn) &&
- !SUPER_PAGE_DONE(sp_pfn))
- {
- /* break previously allocated super page*/
- if ( break_super_page(xch, dom, ctx, sp_pfn) != 0 )
- {
- ERROR("Break previous super page fail!\n");
- return 1;
- }
- }
-
- /* follwing pages fit the order in 2M extent */
- return 0;
- }
-
- /*
- * We try to allocate a 2M page only when:
- * user require this(superpages),
- * AND have enough memory,
- * AND is in the tracking,
- * AND tracked all pages in 2M extent, OR partial 2M extent for speculation
- * AND any page in 2M extent are not populated
- */
- if ( !SUPER_PAGE_DONE(sp_pfn) && !force_super_page )
- goto normal_page;
-
- pfn = batch_buf[0] & ~XEN_DOMCTL_PFINFO_LTAB_MASK;
- if ( super_page_populated(xch, ctx, pfn) )
- goto normal_page;
-
- pfn &= ~(SUPERPAGE_NR_PFNS - 1);
- mfn = pfn;
-
- if ( xc_domain_memory_populate_physmap(xch, dom, 1,
- SUPERPAGE_PFN_SHIFT, 0, &mfn) == 0)
- {
- for ( i = pfn; i < pfn + SUPERPAGE_NR_PFNS; i++, mfn++ )
- {
- ctx->p2m[i] = mfn;
- }
- return 0;
- }
- DPRINTF("No 2M page available for pfn 0x%lx, fall back to 4K page.\n",
- pfn);
- ctx->no_superpage_mem = 1;
-
-normal_page:
- if ( !batch_buf )
- return 0;
-
- /* End the tracking, if want a 2M page but end by 4K pages, */
- *next_pfn = INVALID_SUPER_PAGE;
-
- for ( i = 0; i < nr_extents; i++ )
- {
- unsigned long pagetype = batch_buf[i] & XEN_DOMCTL_PFINFO_LTAB_MASK;
- if ( pagetype == XEN_DOMCTL_PFINFO_XTAB )
- continue;
-
- pfn = mfn = batch_buf[i] & ~XEN_DOMCTL_PFINFO_LTAB_MASK;
- if ( ctx->p2m[pfn] == INVALID_P2M_ENTRY )
- {
- if (xc_domain_memory_populate_physmap(xch, dom, 1, 0,
- 0, &mfn) != 0)
- {
- PERROR("Failed to allocate physical memory.! pfn=0x%lx,
mfn=0x%lx.",
- pfn, mfn);
- errno = ENOMEM;
- return 1;
- }
- ctx->p2m[pfn] = mfn;
- }
- }
-
- return 0;
-}
-
-static int allocate_physmem(xc_interface *xch, uint32_t dom,
- struct restore_ctx *ctx,
- unsigned long *region_pfn_type, int region_size,
- unsigned int hvm, xen_pfn_t *region_mfn, int
superpages)
-{
- int i;
- unsigned long pfn;
- unsigned long pagetype;
-
- /* Next expected pfn in order to track a possible 2M page */
- static unsigned long required_pfn = INVALID_SUPER_PAGE;
-
- /* Buffer of pfn list for 2M page, or series of 4K pages */
- xen_pfn_t *batch_buf;
- unsigned int batch_buf_len;
- struct domain_info_context *dinfo = &ctx->dinfo;
-
- if ( !superpages )
- {
- batch_buf = ®ion_pfn_type[0];
- batch_buf_len = region_size;
- goto alloc_page;
- }
-
- batch_buf = NULL;
- batch_buf_len = 0;
- /* This loop tracks the possible 2M page */
- for (i = 0; i < region_size; i++)
- {
- pfn = region_pfn_type[i] & ~XEN_DOMCTL_PFINFO_LTAB_MASK;
- pagetype = region_pfn_type[i] & XEN_DOMCTL_PFINFO_LTAB_MASK;
-
- if (pagetype == XEN_DOMCTL_PFINFO_XTAB)
- {
- /* Do not start collecting pfns until get a valid pfn */
- if ( batch_buf_len != 0 )
- batch_buf_len++;
- continue;
- }
-
- if ( SUPER_PAGE_START(pfn) )
- {
- /* Start of a 2M extent, populate previsous buf */
- if ( allocate_mfn_list(xch, dom, ctx,
- batch_buf_len, batch_buf,
- &required_pfn, superpages) != 0 )
- {
- errno = ENOMEM;
- return 1;
- }
-
- /* start new tracking for 2M page */
- batch_buf = ®ion_pfn_type[i];
- batch_buf_len = 1;
- required_pfn = pfn + 1;
- }
- else if ( pfn == required_pfn )
- {
- /* this page fit the 2M extent in order */
- batch_buf_len++;
- required_pfn++;
- }
- else if ( SUPER_PAGE_TRACKING(required_pfn) )
- {
- /* break of a 2M extent, populate previous buf */
- if ( allocate_mfn_list(xch, dom, ctx,
- batch_buf_len, batch_buf,
- &required_pfn, superpages) != 0 )
- {
- errno = ENOMEM;
- return 1;
- }
- /* start new tracking for a series of 4K pages */
- batch_buf = ®ion_pfn_type[i];
- batch_buf_len = 1;
- required_pfn = INVALID_SUPER_PAGE;
- }
- else
- {
- /* this page is 4K */
- if ( !batch_buf )
- batch_buf = ®ion_pfn_type[i];
- batch_buf_len++;
- }
- }
-
- /*
- * populate rest batch_buf in the end.
- * In a speculative way, we allocate a 2M page even when not see all the
- * pages in order(set bit 31). If not require super page support,
- * we can skip the tracking loop and come here directly.
- * Speculative allocation can't be used for PV guest, as we have no mfn to
- * map previous 2M mem range if need break it.
- */
- if ( SUPER_PAGE_TRACKING(required_pfn) &&
- !SUPER_PAGE_DONE(required_pfn) )
- {
- if (hvm)
- required_pfn |= FORCE_SP_MASK;
- else
- required_pfn = INVALID_SUPER_PAGE;
- }
-
-alloc_page:
- if ( batch_buf )
- {
- if ( allocate_mfn_list(xch, dom, ctx,
- batch_buf_len, batch_buf,
- &required_pfn,
- superpages) != 0 )
- {
- errno = ENOMEM;
- return 1;
- }
- }
-
- for (i = 0; i < region_size; i++)
- {
- pfn = region_pfn_type[i] & ~XEN_DOMCTL_PFINFO_LTAB_MASK;
- pagetype = region_pfn_type[i] & XEN_DOMCTL_PFINFO_LTAB_MASK;
-
- if ( pfn > dinfo->p2m_size )
- {
- ERROR("pfn out of range");
- return 1;
- }
- if (pagetype == XEN_DOMCTL_PFINFO_XTAB)
- {
- region_mfn[i] = ~0UL;
- }
- else
- {
- if (ctx->p2m[pfn] == INVALID_P2M_ENTRY)
- {
- DPRINTF("Warning: pfn 0x%lx are not allocated!\n", pfn);
- /*XXX:allocate this page?*/
- }
-
- /* setup region_mfn[] for batch map.
- * For HVM guests, this interface takes PFNs, not MFNs */
- region_mfn[i] = hvm ? pfn : ctx->p2m[pfn];
- }
- }
- return 0;
-}
-
/* set when a consistent image is available */
static int completed = 0;
@@ -498,16 +99,59 @@ static ssize_t rdexact(struct xc_interfa
** This function inverts that operation, replacing the pfn values with
** the (now known) appropriate mfn values.
*/
-static int uncanonicalize_pagetable(xc_interface *xch, uint32_t dom, struct
restore_ctx *ctx,
- void *page, int superpages)
-{
- int i, pte_last;
+static int uncanonicalize_pagetable(
+ xc_interface *xch, uint32_t dom, struct restore_ctx *ctx, void *page)
+{
+ int i, pte_last, nr_mfns = 0;
unsigned long pfn;
uint64_t pte;
struct domain_info_context *dinfo = &ctx->dinfo;
pte_last = PAGE_SIZE / ((ctx->pt_levels == 2)? 4 : 8);
+ /* First pass: work out how many (if any) MFNs we need to alloc */
+ for ( i = 0; i < pte_last; i++ )
+ {
+ if ( ctx->pt_levels == 2 )
+ pte = ((uint32_t *)page)[i];
+ else
+ pte = ((uint64_t *)page)[i];
+
+ /* XXX SMH: below needs fixing for PROT_NONE etc */
+ if ( !(pte & _PAGE_PRESENT) )
+ continue;
+
+ pfn = (pte >> PAGE_SHIFT) & MFN_MASK_X86;
+
+ if ( pfn >= dinfo->p2m_size )
+ {
+ /* This "page table page" is probably not one; bail. */
+ ERROR("Frame number in page table is out of range: "
+ "i=%d pfn=0x%lx p2m_size=%lu",
+ i, pfn, dinfo->p2m_size);
+ return 0;
+ }
+
+ if ( ctx->p2m[pfn] == INVALID_P2M_ENTRY )
+ {
+ /* Have a 'valid' PFN without a matching MFN - need to alloc */
+ ctx->p2m_batch[nr_mfns++] = pfn;
+ ctx->p2m[pfn]--;
+ }
+ }
+
+ /* Allocate the requisite number of mfns. */
+ if ( nr_mfns &&
+ (xc_domain_memory_populate_physmap(xch, dom, nr_mfns, 0, 0,
+ ctx->p2m_batch) != 0) )
+ {
+ ERROR("Failed to allocate memory for batch.!\n");
+ errno = ENOMEM;
+ return 0;
+ }
+
+ /* Second pass: uncanonicalize each present PTE */
+ nr_mfns = 0;
for ( i = 0; i < pte_last; i++ )
{
if ( ctx->pt_levels == 2 )
@@ -521,14 +165,9 @@ static int uncanonicalize_pagetable(xc_i
pfn = (pte >> PAGE_SHIFT) & MFN_MASK_X86;
- /* Allocate mfn if necessary */
- if ( ctx->p2m[pfn] == INVALID_P2M_ENTRY )
- {
- unsigned long force_pfn = superpages ? FORCE_SP_MASK : pfn;
- if (allocate_mfn_list(xch, dom, ctx,
- 1, &pfn, &force_pfn, superpages) != 0)
- return 0;
- }
+ if ( ctx->p2m[pfn] == (INVALID_P2M_ENTRY-1) )
+ ctx->p2m[pfn] = ctx->p2m_batch[nr_mfns++];
+
pte &= ~MADDR_MASK_X86;
pte |= (uint64_t)ctx->p2m[pfn] << PAGE_SHIFT;
@@ -1173,9 +812,9 @@ static int apply_batch(xc_interface *xch
static int apply_batch(xc_interface *xch, uint32_t dom, struct restore_ctx
*ctx,
xen_pfn_t* region_mfn, unsigned long* pfn_type, int
pae_extended_cr3,
unsigned int hvm, struct xc_mmu* mmu,
- pagebuf_t* pagebuf, int curbatch, int superpages)
-{
- int i, j, curpage;
+ pagebuf_t* pagebuf, int curbatch)
+{
+ int i, j, curpage, nr_mfns;
/* used by debug verify code */
unsigned long buf[PAGE_SIZE/sizeof(unsigned long)];
/* Our mapping of the current region (batch) */
@@ -1193,11 +832,56 @@ static int apply_batch(xc_interface *xch
if (j > MAX_BATCH_SIZE)
j = MAX_BATCH_SIZE;
- if (allocate_physmem(xch, dom, ctx, &pagebuf->pfn_types[curbatch],
- j, hvm, region_mfn, superpages) != 0)
- {
- ERROR("allocate_physmem() failed\n");
- return -1;
+ /* First pass for this batch: work out how much memory to alloc */
+ nr_mfns = 0;
+ for ( i = 0; i < j; i++ )
+ {
+ unsigned long pfn, pagetype;
+ pfn = pagebuf->pfn_types[i] & ~XEN_DOMCTL_PFINFO_LTAB_MASK;
+ pagetype = pagebuf->pfn_types[i] & XEN_DOMCTL_PFINFO_LTAB_MASK;
+
+ if ( (pagetype != XEN_DOMCTL_PFINFO_XTAB) &&
+ (ctx->p2m[pfn] == INVALID_P2M_ENTRY) )
+ {
+ /* Have a live PFN which hasn't had an MFN allocated */
+ ctx->p2m_batch[nr_mfns++] = pfn;
+ ctx->p2m[pfn]--;
+ }
+ }
+
+ /* Now allocate a bunch of mfns for this batch */
+ if ( nr_mfns &&
+ (xc_domain_memory_populate_physmap(xch, dom, nr_mfns, 0,
+ 0, ctx->p2m_batch) != 0) )
+ {
+ ERROR("Failed to allocate memory for batch.!\n");
+ errno = ENOMEM;
+ return -1;
+ }
+
+ /* Second pass for this batch: update p2m[] and region_mfn[] */
+ nr_mfns = 0;
+ for ( i = 0; i < j; i++ )
+ {
+ unsigned long pfn, pagetype;
+ pfn = pagebuf->pfn_types[i] & ~XEN_DOMCTL_PFINFO_LTAB_MASK;
+ pagetype = pagebuf->pfn_types[i] & XEN_DOMCTL_PFINFO_LTAB_MASK;
+
+ if ( pagetype == XEN_DOMCTL_PFINFO_XTAB )
+ region_mfn[i] = ~0UL; /* map will fail but we don't care */
+ else
+ {
+ if ( ctx->p2m[pfn] == (INVALID_P2M_ENTRY-1) )
+ {
+ /* We just allocated a new mfn above; update p2m */
+ ctx->p2m[pfn] = ctx->p2m_batch[nr_mfns++];
+ ctx->nr_pfns++;
+ }
+
+ /* setup region_mfn[] for batch map.
+ * For HVM guests, this interface takes PFNs, not MFNs */
+ region_mfn[i] = hvm ? pfn : ctx->p2m[pfn];
+ }
}
/* Map relevant mfns */
@@ -1262,8 +946,7 @@ static int apply_batch(xc_interface *xch
pae_extended_cr3 ||
(pagetype != XEN_DOMCTL_PFINFO_L1TAB)) {
- if (!uncanonicalize_pagetable(xch, dom, ctx,
- page, superpages)) {
+ if (!uncanonicalize_pagetable(xch, dom, ctx, page)) {
/*
** Failing to uncanonicalize a page table can be ok
** under live migration since the pages type may have
@@ -1376,7 +1059,6 @@ int xc_domain_restore(xc_interface *xch,
static struct restore_ctx _ctx = {
.live_p2m = NULL,
.p2m = NULL,
- .no_superpage_mem = 0,
};
static struct restore_ctx *ctx = &_ctx;
struct domain_info_context *dinfo = &ctx->dinfo;
@@ -1388,9 +1070,8 @@ int xc_domain_restore(xc_interface *xch,
/* For info only */
ctx->nr_pfns = 0;
- /* Always try to allocate 2M pages for HVM */
- if ( hvm )
- superpages = 1;
+ if ( superpages )
+ return 1;
if ( read_exact(io_fd, &dinfo->p2m_size, sizeof(unsigned long)) )
{
@@ -1439,9 +1120,11 @@ int xc_domain_restore(xc_interface *xch,
region_mfn = xc_memalign(PAGE_SIZE, ROUNDUP(
MAX_BATCH_SIZE * sizeof(xen_pfn_t), PAGE_SHIFT));
+ ctx->p2m_batch = xc_memalign(
+ PAGE_SIZE, ROUNDUP(MAX_BATCH_SIZE * sizeof(xen_pfn_t), PAGE_SHIFT));
if ( (ctx->p2m == NULL) || (pfn_type == NULL) ||
- (region_mfn == NULL) )
+ (region_mfn == NULL) || (ctx->p2m_batch == NULL) )
{
ERROR("memory alloc failed");
errno = ENOMEM;
@@ -1450,10 +1133,18 @@ int xc_domain_restore(xc_interface *xch,
memset(region_mfn, 0,
ROUNDUP(MAX_BATCH_SIZE * sizeof(xen_pfn_t), PAGE_SHIFT));
+ memset(ctx->p2m_batch, 0,
+ ROUNDUP(MAX_BATCH_SIZE * sizeof(xen_pfn_t), PAGE_SHIFT));
if ( lock_pages(region_mfn, sizeof(xen_pfn_t) * MAX_BATCH_SIZE) )
{
PERROR("Could not lock region_mfn");
+ goto out;
+ }
+
+ if ( lock_pages(ctx->p2m_batch, sizeof(xen_pfn_t) * MAX_BATCH_SIZE) )
+ {
+ ERROR("Could not lock p2m_batch");
goto out;
}
@@ -1525,7 +1216,7 @@ int xc_domain_restore(xc_interface *xch,
int brc;
brc = apply_batch(xch, dom, ctx, region_mfn, pfn_type,
- pae_extended_cr3, hvm, mmu, &pagebuf, curbatch,
superpages);
+ pae_extended_cr3, hvm, mmu, &pagebuf, curbatch);
if ( brc < 0 )
goto out;
@@ -1689,7 +1380,7 @@ int xc_domain_restore(xc_interface *xch,
{
if ( !uncanonicalize_pagetable(
xch, dom, ctx,
- region_base + k*PAGE_SIZE, superpages) )
+ region_base + k*PAGE_SIZE) )
{
ERROR("failed uncanonicalize pt!");
goto out;
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