This patch avoids compromises with evil concepts (reverse maps) in the
shadow code and limits to a maximum value the number of writable
mappings of OOS pages.
Code is simpler and performance do not degrade.
Signed-off-by: Gianluca Guida <gianluca.guida@xxxxxxxxxxxxx>
diff -r 9cf72db44ee9 xen/arch/x86/mm/shadow/common.c
--- a/xen/arch/x86/mm/shadow/common.c Fri Jul 04 11:54:21 2008 +0100
+++ b/xen/arch/x86/mm/shadow/common.c Fri Jul 04 19:26:33 2008 +0100
@@ -69,12 +69,14 @@ void shadow_vcpu_init(struct vcpu *v)
void shadow_vcpu_init(struct vcpu *v)
{
#if (SHADOW_OPTIMIZATIONS & SHOPT_OUT_OF_SYNC)
- int i;
+ int i, j;
for ( i = 0; i < SHADOW_OOS_PAGES; i++ )
{
v->arch.paging.shadow.oos[i] = _mfn(INVALID_MFN);
v->arch.paging.shadow.oos_snapshot[i] = _mfn(INVALID_MFN);
+ for ( j = 0; j < SHADOW_OOS_FIXUPS; j++ )
+ v->arch.paging.shadow.oos_fixup[i].smfn[j] = _mfn(INVALID_MFN);
}
#endif
@@ -579,132 +581,86 @@ static inline void _sh_resync_l1(struct
#endif
}
-#define _FIXUP_IDX(_b, _i) ((_b) * SHADOW_OOS_FT_HASH + (_i))
+
+/*
+ * Fixup arrays: We limit the maximum number of writable mappings to
+ * SHADOW_OOS_FIXUPS and store enough information to remove them
+ * quickly on resync.
+ */
+
+static inline int oos_fixup_flush_gmfn(struct vcpu *v, mfn_t gmfn,
+ struct oos_fixup *fixup)
+{
+ int i;
+ for ( i = 0; i < SHADOW_OOS_FIXUPS; i++ )
+ {
+ if ( mfn_x(fixup->smfn[i]) != INVALID_MFN )
+ {
+ sh_remove_write_access_from_sl1p(v, gmfn,
+ fixup->smfn[i],
+ fixup->off[i]);
+ fixup->smfn[i] = _mfn(INVALID_MFN);
+ }
+ }
+
+ /* Always flush the TLBs. See comment on oos_fixup_add(). */
+ return 1;
+}
void oos_fixup_add(struct vcpu *v, mfn_t gmfn,
- mfn_t smfn, unsigned long off)
+ mfn_t smfn, unsigned long off)
{
- int idx, i, free = 0, free_slot = 0;
- struct oos_fixup *fixups = v->arch.paging.shadow.oos_fixups;
+ int idx, next;
+ mfn_t *oos;
+ struct oos_fixup *oos_fixup;
+ struct domain *d = v->domain;
- idx = mfn_x(gmfn) % SHADOW_OOS_FT_HASH;
- for ( i = 0; i < SHADOW_OOS_FT_ENTRIES; i++ )
+ perfc_incr(shadow_oos_fixup_add);
+
+ for_each_vcpu(d, v)
{
- if ( !mfn_valid(fixups[_FIXUP_IDX(idx, i)].gmfn)
- || !mfn_is_out_of_sync(fixups[_FIXUP_IDX(idx, i)].gmfn) )
+ oos = v->arch.paging.shadow.oos;
+ oos_fixup = v->arch.paging.shadow.oos_fixup;
+ idx = mfn_x(gmfn) % SHADOW_OOS_PAGES;
+ if ( mfn_x(oos[idx]) != mfn_x(gmfn) )
+ idx = (idx + 1) % SHADOW_OOS_PAGES;
+ if ( mfn_x(oos[idx]) == mfn_x(gmfn) )
{
- free = 1;
- free_slot = _FIXUP_IDX(idx, i);
- }
- else if ( (mfn_x(fixups[_FIXUP_IDX(idx, i)].gmfn) == mfn_x(gmfn))
- && (mfn_x(fixups[_FIXUP_IDX(idx, i)].smfn) == mfn_x(smfn))
- && (fixups[_FIXUP_IDX(idx, i)].off == off) )
- {
- perfc_incr(shadow_oos_fixup_no_add);
+ next = oos_fixup[idx].next;
+
+ if ( mfn_x(oos_fixup[idx].smfn[next]) != INVALID_MFN )
+ {
+ /* Reuse this slot and remove current writable mapping. */
+ sh_remove_write_access_from_sl1p(v, gmfn,
+ oos_fixup[idx].smfn[next],
+ oos_fixup[idx].off[next]);
+ perfc_incr(shadow_oos_fixup_evict);
+ /* We should flush the TLBs now, because we removed a
+ writable mapping, but since the shadow is already
+ OOS we have no problem if another vcpu write to
+ this page table. We just have to be very careful to
+ *always* flush the tlbs on resync. */
+ }
+
+ oos_fixup[idx].smfn[next] = smfn;
+ oos_fixup[idx].off[next] = off;
+ oos_fixup[idx].next = (next + 1) % SHADOW_OOS_FIXUPS;
return;
}
}
- if ( free )
- {
- if ( !v->arch.paging.shadow.oos_fixup_used )
- v->arch.paging.shadow.oos_fixup_used = 1;
- fixups[free_slot].gmfn = gmfn;
- fixups[free_slot].smfn = smfn;
- fixups[free_slot].off = off;
- perfc_incr(shadow_oos_fixup_add_ok);
- return;
- }
-
-
- perfc_incr(shadow_oos_fixup_add_fail);
+ SHADOW_ERROR("gmfn %lx was OOS but not in hash table\n", mfn_x(gmfn));
+ BUG();
}
-void oos_fixup_remove(struct vcpu *v, mfn_t gmfn)
-{
- int idx, i;
- struct domain *d = v->domain;
-
- perfc_incr(shadow_oos_fixup_remove);
-
- /* If the domain is dying we might get called when deallocating
- * the shadows. Fixup tables are already freed so exit now. */
- if ( d->is_dying )
- return;
-
- idx = mfn_x(gmfn) % SHADOW_OOS_FT_HASH;
- for_each_vcpu(d, v)
- {
- struct oos_fixup *fixups = v->arch.paging.shadow.oos_fixups;
- for ( i = 0; i < SHADOW_OOS_FT_ENTRIES; i++ )
- if ( mfn_x(fixups[_FIXUP_IDX(idx, i)].gmfn) == mfn_x(gmfn) )
- fixups[_FIXUP_IDX(idx, i)].gmfn = _mfn(INVALID_MFN);
- }
-}
-
-int oos_fixup_flush(struct vcpu *v)
-{
- int i, rc = 0;
- struct oos_fixup *fixups = v->arch.paging.shadow.oos_fixups;
-
- perfc_incr(shadow_oos_fixup_flush);
-
- if ( !v->arch.paging.shadow.oos_fixup_used )
- return 0;
-
- for ( i = 0; i < SHADOW_OOS_FT_HASH * SHADOW_OOS_FT_ENTRIES; i++ )
- {
- if ( mfn_valid(fixups[i].gmfn) )
- {
- if ( mfn_is_out_of_sync(fixups[i].gmfn) )
- rc |= sh_remove_write_access_from_sl1p(v, fixups[i].gmfn,
- fixups[i].smfn,
- fixups[i].off);
- fixups[i].gmfn = _mfn(INVALID_MFN);
- }
- }
-
- v->arch.paging.shadow.oos_fixup_used = 0;
-
- return rc;
-}
-
-int oos_fixup_flush_gmfn(struct vcpu *v, mfn_t gmfn)
-{
- int idx, i, rc = 0;
- struct domain *d = v->domain;
-
- perfc_incr(shadow_oos_fixup_flush_gmfn);
-
- idx = mfn_x(gmfn) % SHADOW_OOS_FT_HASH;
- for_each_vcpu(d, v)
- {
- struct oos_fixup *fixups = v->arch.paging.shadow.oos_fixups;
-
- for ( i = 0; i < SHADOW_OOS_FT_ENTRIES; i++ )
- {
- if ( mfn_x(fixups[_FIXUP_IDX(idx, i)].gmfn) != mfn_x(gmfn) )
- continue;
-
- rc |= sh_remove_write_access_from_sl1p(v,
-
fixups[_FIXUP_IDX(idx,i)].gmfn,
-
fixups[_FIXUP_IDX(idx,i)].smfn,
-
fixups[_FIXUP_IDX(idx,i)].off);
-
- fixups[_FIXUP_IDX(idx,i)].gmfn = _mfn(INVALID_MFN);
- }
- }
-
- return rc;
-}
-
-static int oos_remove_write_access(struct vcpu *v, mfn_t gmfn, unsigned long
va)
+static int oos_remove_write_access(struct vcpu *v, mfn_t gmfn,
+ struct oos_fixup *fixup)
{
int ftlb = 0;
- ftlb |= oos_fixup_flush_gmfn(v, gmfn);
+ ftlb |= oos_fixup_flush_gmfn(v, gmfn, fixup);
- switch ( sh_remove_write_access(v, gmfn, 0, va) )
+ switch ( sh_remove_write_access(v, gmfn, 0, 0) )
{
default:
case 0:
@@ -732,7 +688,8 @@ static int oos_remove_write_access(struc
/* Pull all the entries on an out-of-sync page back into sync. */
-static void _sh_resync(struct vcpu *v, mfn_t gmfn, unsigned long va, mfn_t snp)
+static void _sh_resync(struct vcpu *v, mfn_t gmfn,
+ struct oos_fixup *fixup, mfn_t snp)
{
struct page_info *pg = mfn_to_page(gmfn);
@@ -747,7 +704,7 @@ static void _sh_resync(struct vcpu *v, m
v->domain->domain_id, v->vcpu_id, mfn_x(gmfn), va);
/* Need to pull write access so the page *stays* in sync. */
- if ( oos_remove_write_access(v, gmfn, va) )
+ if ( oos_remove_write_access(v, gmfn, fixup) )
{
/* Page has been unshadowed. */
return;
@@ -766,13 +723,17 @@ static void _sh_resync(struct vcpu *v, m
/* Add an MFN to the list of out-of-sync guest pagetables */
-static void oos_hash_add(struct vcpu *v, mfn_t gmfn, unsigned long va)
+static void oos_hash_add(struct vcpu *v, mfn_t gmfn)
{
- int idx, oidx, swap = 0;
+ int i, idx, oidx, swap = 0;
void *gptr, *gsnpptr;
mfn_t *oos = v->arch.paging.shadow.oos;
- unsigned long *oos_va = v->arch.paging.shadow.oos_va;
mfn_t *oos_snapshot = v->arch.paging.shadow.oos_snapshot;
+ struct oos_fixup *oos_fixup = v->arch.paging.shadow.oos_fixup;
+ struct oos_fixup fixup = { .next = 0 };
+
+ for (i = 0; i < SHADOW_OOS_FIXUPS; i++ )
+ fixup.smfn[i] = _mfn(INVALID_MFN);
idx = mfn_x(gmfn) % SHADOW_OOS_PAGES;
oidx = idx;
@@ -782,18 +743,18 @@ static void oos_hash_add(struct vcpu *v,
{
/* Punt the current occupant into the next slot */
SWAP(oos[idx], gmfn);
- SWAP(oos_va[idx], va);
+ SWAP(oos_fixup[idx], fixup);
swap = 1;
idx = (idx + 1) % SHADOW_OOS_PAGES;
}
if ( mfn_valid(oos[idx]) )
{
/* Crush the current occupant. */
- _sh_resync(v, oos[idx], oos_va[idx], oos_snapshot[idx]);
+ _sh_resync(v, oos[idx], &oos_fixup[idx], oos_snapshot[idx]);
perfc_incr(shadow_unsync_evict);
}
oos[idx] = gmfn;
- oos_va[idx] = va;
+ oos_fixup[idx] = fixup;
if ( swap )
SWAP(oos_snapshot[idx], oos_snapshot[oidx]);
@@ -862,14 +823,14 @@ void sh_resync(struct vcpu *v, mfn_t gmf
{
int idx;
mfn_t *oos;
- unsigned long *oos_va;
mfn_t *oos_snapshot;
+ struct oos_fixup *oos_fixup;
struct domain *d = v->domain;
for_each_vcpu(d, v)
{
oos = v->arch.paging.shadow.oos;
- oos_va = v->arch.paging.shadow.oos_va;
+ oos_fixup = v->arch.paging.shadow.oos_fixup;
oos_snapshot = v->arch.paging.shadow.oos_snapshot;
idx = mfn_x(gmfn) % SHADOW_OOS_PAGES;
if ( mfn_x(oos[idx]) != mfn_x(gmfn) )
@@ -877,7 +838,7 @@ void sh_resync(struct vcpu *v, mfn_t gmf
if ( mfn_x(oos[idx]) == mfn_x(gmfn) )
{
- _sh_resync(v, gmfn, oos_va[idx], oos_snapshot[idx]);
+ _sh_resync(v, gmfn, &oos_fixup[idx], oos_snapshot[idx]);
oos[idx] = _mfn(INVALID_MFN);
return;
}
@@ -917,8 +878,8 @@ void sh_resync_all(struct vcpu *v, int s
int idx;
struct vcpu *other;
mfn_t *oos = v->arch.paging.shadow.oos;
- unsigned long *oos_va = v->arch.paging.shadow.oos_va;
mfn_t *oos_snapshot = v->arch.paging.shadow.oos_snapshot;
+ struct oos_fixup *oos_fixup = v->arch.paging.shadow.oos_fixup;
SHADOW_PRINTK("d=%d, v=%d\n", v->domain->domain_id, v->vcpu_id);
@@ -930,15 +891,12 @@ void sh_resync_all(struct vcpu *v, int s
if ( do_locking )
shadow_lock(v->domain);
- if ( oos_fixup_flush(v) )
- flush_tlb_mask(v->domain->domain_dirty_cpumask);
-
/* First: resync all of this vcpu's oos pages */
for ( idx = 0; idx < SHADOW_OOS_PAGES; idx++ )
if ( mfn_valid(oos[idx]) )
{
/* Write-protect and sync contents */
- _sh_resync(v, oos[idx], oos_va[idx], oos_snapshot[idx]);
+ _sh_resync(v, oos[idx], &oos_fixup[idx], oos_snapshot[idx]);
oos[idx] = _mfn(INVALID_MFN);
}
@@ -959,8 +917,9 @@ void sh_resync_all(struct vcpu *v, int s
shadow_lock(v->domain);
oos = other->arch.paging.shadow.oos;
- oos_va = other->arch.paging.shadow.oos_va;
+ oos_fixup = other->arch.paging.shadow.oos_fixup;
oos_snapshot = other->arch.paging.shadow.oos_snapshot;
+
for ( idx = 0; idx < SHADOW_OOS_PAGES; idx++ )
{
if ( !mfn_valid(oos[idx]) )
@@ -976,7 +935,7 @@ void sh_resync_all(struct vcpu *v, int s
else
{
/* Write-protect and sync contents */
- _sh_resync(other, oos[idx], oos_va[idx], oos_snapshot[idx]);
+ _sh_resync(other, oos[idx], &oos_fixup[idx],
oos_snapshot[idx]);
oos[idx] = _mfn(INVALID_MFN);
}
}
@@ -987,7 +946,7 @@ void sh_resync_all(struct vcpu *v, int s
}
/* Allow a shadowed page to go out of sync */
-int sh_unsync(struct vcpu *v, mfn_t gmfn, unsigned long va)
+int sh_unsync(struct vcpu *v, mfn_t gmfn)
{
struct page_info *pg;
@@ -1009,7 +968,7 @@ int sh_unsync(struct vcpu *v, mfn_t gmfn
return 0;
pg->shadow_flags |= SHF_out_of_sync|SHF_oos_may_write;
- oos_hash_add(v, gmfn, va);
+ oos_hash_add(v, gmfn);
perfc_incr(shadow_unsync);
return 1;
}
@@ -1064,7 +1023,6 @@ void shadow_demote(struct vcpu *v, mfn_t
if ( page_is_out_of_sync(page) )
{
oos_hash_remove(v, gmfn);
- oos_fixup_remove(v, gmfn);
}
#endif
clear_bit(_PGC_page_table, &page->count_info);
@@ -2804,23 +2762,6 @@ static void sh_update_paging_modes(struc
#endif /* (SHADOW_OPTIMIZATIONS & SHOPT_VIRTUAL_TLB) */
#if (SHADOW_OPTIMIZATIONS & SHOPT_OUT_OF_SYNC)
- if ( v->arch.paging.shadow.oos_fixups == NULL )
- {
- int i;
- v->arch.paging.shadow.oos_fixups =
- alloc_xenheap_pages(SHADOW_OOS_FT_ORDER);
- if ( v->arch.paging.shadow.oos_fixups == NULL )
- {
- SHADOW_ERROR("Could not allocate OOS fixup table"
- " for dom %u vcpu %u\n",
- v->domain->domain_id, v->vcpu_id);
- domain_crash(v->domain);
- return;
- }
- for ( i = 0; i < SHADOW_OOS_FT_HASH * SHADOW_OOS_FT_ENTRIES; i++ )
- v->arch.paging.shadow.oos_fixups[i].gmfn = _mfn(INVALID_MFN);
- }
-
if ( mfn_x(v->arch.paging.shadow.oos_snapshot[0]) == INVALID_MFN )
{
int i;
@@ -3173,13 +3114,6 @@ void shadow_teardown(struct domain *d)
#endif /* (SHADOW_OPTIMIZATIONS & SHOPT_VIRTUAL_TLB) */
#if (SHADOW_OPTIMIZATIONS & SHOPT_OUT_OF_SYNC)
- if ( v->arch.paging.shadow.oos_fixups )
- {
- free_xenheap_pages(v->arch.paging.shadow.oos_fixups,
- SHADOW_OOS_FT_ORDER);
- v->arch.paging.shadow.oos_fixups = NULL;
- }
-
{
int i;
mfn_t *oos_snapshot = v->arch.paging.shadow.oos_snapshot;
diff -r 9cf72db44ee9 xen/arch/x86/mm/shadow/multi.c
--- a/xen/arch/x86/mm/shadow/multi.c Fri Jul 04 11:54:21 2008 +0100
+++ b/xen/arch/x86/mm/shadow/multi.c Fri Jul 04 19:26:33 2008 +0100
@@ -917,7 +917,10 @@ _sh_propagate(struct vcpu *v,
if ( unlikely((level == 1)
&& sh_mfn_is_a_page_table(target_mfn)
#if (SHADOW_OPTIMIZATIONS & SHOPT_OUT_OF_SYNC )
- && !mfn_oos_may_write(target_mfn)
+ /* Unless the page is out of sync and the guest is
+ writing to it. */
+ && !(mfn_oos_may_write(target_mfn)
+ && (ft == ft_demand_write))
#endif /* OOS */
) )
{
@@ -3292,7 +3295,7 @@ static int sh_page_fault(struct vcpu *v,
/* Always unsync when writing to L1 page tables. */
if ( sh_mfn_is_a_page_table(gmfn)
&& ft == ft_demand_write )
- sh_unsync(v, gmfn, va);
+ sh_unsync(v, gmfn);
#endif /* OOS */
/* Calculate the shadow entry and write it */
@@ -3323,8 +3326,10 @@ static int sh_page_fault(struct vcpu *v,
/* Need to emulate accesses to page tables */
if ( sh_mfn_is_a_page_table(gmfn)
#if (SHADOW_OPTIMIZATIONS & SHOPT_OUT_OF_SYNC)
- /* Unless they've been allowed to go out of sync with their shadows */
- && !mfn_is_out_of_sync(gmfn)
+ /* Unless they've been allowed to go out of sync with their
+ shadows and we don't need to unshadow it. */
+ && !(mfn_is_out_of_sync(gmfn)
+ && !(regs->error_code & PFEC_user_mode))
#endif
)
{
@@ -4351,15 +4356,8 @@ int sh_rm_write_access_from_sl1p(struct
sp = mfn_to_shadow_page(smfn);
- if ( sp->mbz != 0 ||
-#if GUEST_PAGING_LEVELS == 4
- (sp->type != SH_type_l1_64_shadow)
-#elif GUEST_PAGING_LEVELS == 3
- (sp->type != SH_type_l1_pae_shadow)
-#elif GUEST_PAGING_LEVELS == 2
- (sp->type != SH_type_l1_32_shadow)
-#endif
- )
+ if ( sp->mbz != 0
+ || (sp->type != SH_type_l1_shadow) )
goto fail;
sl1p = sh_map_domain_page(smfn);
diff -r 9cf72db44ee9 xen/arch/x86/mm/shadow/private.h
--- a/xen/arch/x86/mm/shadow/private.h Fri Jul 04 11:54:21 2008 +0100
+++ b/xen/arch/x86/mm/shadow/private.h Fri Jul 04 19:26:33 2008 +0100
@@ -323,15 +323,6 @@ static inline int sh_type_is_pinnable(st
#define SHF_out_of_sync (1u<<30)
#define SHF_oos_may_write (1u<<29)
-/* Fixup tables are a non-complete writable-mappings reverse map for
- OOS pages. This let us quickly resync pages (avoiding brute-force
- search of the shadows) when the va hint is not sufficient (i.e.,
- the pagetable is mapped in multiple places and in multiple
- shadows.) */
-#define SHADOW_OOS_FT_ENTRIES \
- ((PAGE_SIZE << SHADOW_OOS_FT_ORDER) \
- / (SHADOW_OOS_FT_HASH * sizeof(struct oos_fixup)))
-
#endif /* (SHADOW_OPTIMIZATIONS & SHOPT_OUT_OF_SYNC) */
static inline int sh_page_has_multiple_shadows(struct page_info *pg)
@@ -421,7 +412,7 @@ int shadow_cmpxchg_guest_entry(struct vc
#if (SHADOW_OPTIMIZATIONS & SHOPT_OUT_OF_SYNC)
/* Allow a shadowed page to go out of sync */
-int sh_unsync(struct vcpu *v, mfn_t gmfn, unsigned long va);
+int sh_unsync(struct vcpu *v, mfn_t gmfn);
/* Pull an out-of-sync page back into sync. */
void sh_resync(struct vcpu *v, mfn_t gmfn);
diff -r 9cf72db44ee9 xen/include/asm-x86/domain.h
--- a/xen/include/asm-x86/domain.h Fri Jul 04 11:54:21 2008 +0100
+++ b/xen/include/asm-x86/domain.h Fri Jul 04 19:26:33 2008 +0100
@@ -128,14 +128,12 @@ struct shadow_vcpu {
/* Shadow out-of-sync: pages that this vcpu has let go out of sync */
mfn_t oos[SHADOW_OOS_PAGES];
- unsigned long oos_va[SHADOW_OOS_PAGES];
mfn_t oos_snapshot[SHADOW_OOS_PAGES];
struct oos_fixup {
- mfn_t gmfn;
- mfn_t smfn;
- unsigned long off;
- } *oos_fixups;
- int oos_fixup_used;
+ int next;
+ mfn_t smfn[SHADOW_OOS_FIXUPS];
+ unsigned long off[SHADOW_OOS_FIXUPS];
+ } oos_fixup[SHADOW_OOS_PAGES];
};
/************************************************/
diff -r 9cf72db44ee9 xen/include/asm-x86/mm.h
--- a/xen/include/asm-x86/mm.h Fri Jul 04 11:54:21 2008 +0100
+++ b/xen/include/asm-x86/mm.h Fri Jul 04 19:26:33 2008 +0100
@@ -133,10 +133,8 @@ static inline u32 pickle_domptr(struct d
/* The number of out-of-sync shadows we allow per vcpu (prime, please) */
#define SHADOW_OOS_PAGES 3
-/* The order OOS fixup tables per vcpu */
-#define SHADOW_OOS_FT_ORDER 1
-/* OOS fixup tables hash entries */
-#define SHADOW_OOS_FT_HASH 13
+/* OOS fixup entries */
+#define SHADOW_OOS_FIXUPS 2
#define page_get_owner(_p) (unpickle_domptr((_p)->u.inuse._domain))
#define page_set_owner(_p,_d) ((_p)->u.inuse._domain = pickle_domptr(_d))
diff -r 9cf72db44ee9 xen/include/asm-x86/perfc_defn.h
--- a/xen/include/asm-x86/perfc_defn.h Fri Jul 04 11:54:21 2008 +0100
+++ b/xen/include/asm-x86/perfc_defn.h Fri Jul 04 19:26:33 2008 +0100
@@ -105,13 +105,8 @@ PERFCOUNTER(shadow_em_ex_non_pt, "shad
PERFCOUNTER(shadow_em_ex_non_pt, "shadow extra non-pt-write op")
PERFCOUNTER(shadow_em_ex_fail, "shadow extra emulation failed")
-PERFCOUNTER(shadow_oos_fixup_add_ok, "shadow OOS fixups adds")
-PERFCOUNTER(shadow_oos_fixup_no_add, "shadow OOS fixups no adds")
-PERFCOUNTER(shadow_oos_fixup_add_fail, "shadow OOS fixups adds failed")
-PERFCOUNTER(shadow_oos_fixup_remove, "shadow OOS fixups removes")
-PERFCOUNTER(shadow_oos_fixup_flush, "shadow OOS fixups flushes")
-PERFCOUNTER(shadow_oos_fixup_flush_gmfn,"shadow OOS fixups gmfn flushes")
-
+PERFCOUNTER(shadow_oos_fixup_add, "shadow OOS fixup adds")
+PERFCOUNTER(shadow_oos_fixup_evict,"shadow OOS fixup evictions")
PERFCOUNTER(shadow_unsync, "shadow OOS unsyncs")
PERFCOUNTER(shadow_unsync_evict, "shadow OOS evictions")
PERFCOUNTER(shadow_resync, "shadow OOS resyncs")
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