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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] [XEN] Remove backpointer info from page type info. No longer used.
# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Node ID dc9fa4dcd19ce206889674ab4d7d62190d4fe216
# Parent d59d6a440a41bfdba172ed78c92f4b4eebefa23e
[XEN] Remove backpointer info from page type info. No longer used.
Replace with a flag for PAE final L2, needed for detecting PAE L2's
which contain Xen mappings.
This is a fixed version of 11438:965df40965e5fa684e0c8fe38dc4950af5b37c84
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
xen/arch/ia64/xen/mm.c | 95 +++-------
xen/arch/powerpc/mm.c | 80 ++------
xen/arch/x86/domain_build.c | 8
xen/arch/x86/mm.c | 294 +++++++++----------------------
xen/arch/x86/mm/shadow/common.c | 7
xen/arch/x86/mm/shadow/multi.c | 2
xen/include/asm-ia64/mm.h | 8
xen/include/asm-powerpc/mm.h | 8
xen/include/asm-x86/mm.h | 50 -----
xen/include/asm-x86/x86_32/page-3level.h | 2
10 files changed, 157 insertions(+), 397 deletions(-)
diff -r d59d6a440a41 -r dc9fa4dcd19c xen/arch/ia64/xen/mm.c
--- a/xen/arch/ia64/xen/mm.c Fri Sep 15 23:54:04 2006 +0100
+++ b/xen/arch/ia64/xen/mm.c Mon Sep 18 14:15:03 2006 +0100
@@ -1627,13 +1627,6 @@ void put_page_type(struct page_info *pag
nx &= ~PGT_validated;
}
}
- else if ( unlikely(((nx & (PGT_pinned | PGT_count_mask)) ==
- (PGT_pinned | 1)) &&
- ((nx & PGT_type_mask) != PGT_writable_page)) )
- {
- /* Page is now only pinned. Make the back pointer mutable again. */
- nx |= PGT_va_mutable;
- }
}
while ( unlikely((y = cmpxchg_rel(&page->u.inuse.type_info, x, nx)) != x)
);
}
@@ -1642,6 +1635,8 @@ int get_page_type(struct page_info *page
int get_page_type(struct page_info *page, u32 type)
{
u32 nx, x, y = page->u.inuse.type_info;
+
+ ASSERT(!(type & ~PGT_type_mask));
again:
do {
@@ -1654,29 +1649,25 @@ int get_page_type(struct page_info *page
}
else if ( unlikely((x & PGT_count_mask) == 0) )
{
- if ( (x & (PGT_type_mask|PGT_va_mask)) != type )
+ if ( (x & PGT_type_mask) != type )
{
- if ( (x & PGT_type_mask) != (type & PGT_type_mask) )
+ /*
+ * On type change we check to flush stale TLB entries. This
+ * may be unnecessary (e.g., page was GDT/LDT) but those
+ * circumstances should be very rare.
+ */
+ cpumask_t mask =
+ page_get_owner(page)->domain_dirty_cpumask;
+ tlbflush_filter(mask, page->tlbflush_timestamp);
+
+ if ( unlikely(!cpus_empty(mask)) )
{
- /*
- * On type change we check to flush stale TLB
- * entries. This may be unnecessary (e.g., page
- * was GDT/LDT) but those circumstances should be
- * very rare.
- */
- cpumask_t mask =
- page_get_owner(page)->domain_dirty_cpumask;
- tlbflush_filter(mask, page->tlbflush_timestamp);
-
- if ( unlikely(!cpus_empty(mask)) )
- {
- perfc_incrc(need_flush_tlb_flush);
- flush_tlb_mask(mask);
- }
+ perfc_incrc(need_flush_tlb_flush);
+ flush_tlb_mask(mask);
}
/* We lose existing type, back pointer, and validity. */
- nx &= ~(PGT_type_mask | PGT_va_mask | PGT_validated);
+ nx &= ~(PGT_type_mask | PGT_validated);
nx |= type;
/* No special validation needed for writable pages. */
@@ -1685,46 +1676,22 @@ int get_page_type(struct page_info *page
nx |= PGT_validated;
}
}
- else
+ else if ( unlikely((x & PGT_type_mask) != type) )
{
- if ( unlikely((x & (PGT_type_mask|PGT_va_mask)) != type) )
- {
- if ( unlikely((x & PGT_type_mask) != (type & PGT_type_mask) ) )
- {
- if ( ((x & PGT_type_mask) != PGT_l2_page_table) ||
- ((type & PGT_type_mask) != PGT_l1_page_table) )
- MEM_LOG("Bad type (saw %08x != exp %08x) "
- "for mfn %016lx (pfn %016lx)",
- x, type, page_to_mfn(page),
- get_gpfn_from_mfn(page_to_mfn(page)));
- return 0;
- }
- else if ( (x & PGT_va_mask) == PGT_va_mutable )
- {
- /* The va backpointer is mutable, hence we update it. */
- nx &= ~PGT_va_mask;
- nx |= type; /* we know the actual type is correct */
- }
- else if ( ((type & PGT_va_mask) != PGT_va_mutable) &&
- ((type & PGT_va_mask) != (x & PGT_va_mask)) )
- {
-#ifdef CONFIG_X86_PAE
- /* We use backptr as extra typing. Cannot be unknown. */
- if ( (type & PGT_type_mask) == PGT_l2_page_table )
- return 0;
-#endif
- /* This table is possibly mapped at multiple locations. */
- nx &= ~PGT_va_mask;
- nx |= PGT_va_unknown;
- }
- }
- if ( unlikely(!(x & PGT_validated)) )
- {
- /* Someone else is updating validation of this page. Wait... */
- while ( (y = page->u.inuse.type_info) == x )
- cpu_relax();
- goto again;
- }
+ if ( ((x & PGT_type_mask) != PGT_l2_page_table) ||
+ (type != PGT_l1_page_table) )
+ MEM_LOG("Bad type (saw %08x != exp %08x) "
+ "for mfn %016lx (pfn %016lx)",
+ x, type, page_to_mfn(page),
+ get_gpfn_from_mfn(page_to_mfn(page)));
+ return 0;
+ }
+ else if ( unlikely(!(x & PGT_validated)) )
+ {
+ /* Someone else is updating validation of this page. Wait... */
+ while ( (y = page->u.inuse.type_info) == x )
+ cpu_relax();
+ goto again;
}
}
while ( unlikely((y = cmpxchg_acq(&page->u.inuse.type_info, x, nx)) != x)
);
diff -r d59d6a440a41 -r dc9fa4dcd19c xen/arch/powerpc/mm.c
--- a/xen/arch/powerpc/mm.c Fri Sep 15 23:54:04 2006 +0100
+++ b/xen/arch/powerpc/mm.c Mon Sep 18 14:15:03 2006 +0100
@@ -87,12 +87,6 @@ void put_page_type(struct page_info *pag
/* Record TLB information for flush later. */
page->tlbflush_timestamp = tlbflush_current_time();
}
- else if ( unlikely((nx & (PGT_pinned|PGT_type_mask|PGT_count_mask)) ==
- (PGT_pinned | 1)) )
- {
- /* Page is now only pinned. Make the back pointer mutable again. */
- nx |= PGT_va_mutable;
- }
}
while ( unlikely((y = cmpxchg(&page->u.inuse.type_info, x, nx)) != x) );
}
@@ -101,6 +95,8 @@ int get_page_type(struct page_info *page
int get_page_type(struct page_info *page, unsigned long type)
{
unsigned long nx, x, y = page->u.inuse.type_info;
+
+ ASSERT(!(type & ~PGT_type_mask));
again:
do {
@@ -113,29 +109,25 @@ int get_page_type(struct page_info *page
}
else if ( unlikely((x & PGT_count_mask) == 0) )
{
- if ( (x & (PGT_type_mask|PGT_va_mask)) != type )
+ if ( (x & PGT_type_mask) != type )
{
- if ( (x & PGT_type_mask) != (type & PGT_type_mask) )
+ /*
+ * On type change we check to flush stale TLB entries. This
+ * may be unnecessary (e.g., page was GDT/LDT) but those
+ * circumstances should be very rare.
+ */
+ cpumask_t mask =
+ page_get_owner(page)->domain_dirty_cpumask;
+ tlbflush_filter(mask, page->tlbflush_timestamp);
+
+ if ( unlikely(!cpus_empty(mask)) )
{
- /*
- * On type change we check to flush stale TLB
- * entries. This may be unnecessary (e.g., page
- * was GDT/LDT) but those circumstances should be
- * very rare.
- */
- cpumask_t mask =
- page_get_owner(page)->domain_dirty_cpumask;
- tlbflush_filter(mask, page->tlbflush_timestamp);
-
- if ( unlikely(!cpus_empty(mask)) )
- {
- perfc_incrc(need_flush_tlb_flush);
- flush_tlb_mask(mask);
- }
+ perfc_incrc(need_flush_tlb_flush);
+ flush_tlb_mask(mask);
}
/* We lose existing type, back pointer, and validity. */
- nx &= ~(PGT_type_mask | PGT_va_mask | PGT_validated);
+ nx &= ~(PGT_type_mask | PGT_validated);
nx |= type;
/* No special validation needed for writable pages. */
@@ -144,36 +136,16 @@ int get_page_type(struct page_info *page
nx |= PGT_validated;
}
}
- else
- {
- if ( unlikely((x & (PGT_type_mask|PGT_va_mask)) != type) )
- {
- if ( unlikely((x & PGT_type_mask) != (type & PGT_type_mask) ) )
- {
- return 0;
- }
- else if ( (x & PGT_va_mask) == PGT_va_mutable )
- {
- /* The va backpointer is mutable, hence we update it. */
- nx &= ~PGT_va_mask;
- nx |= type; /* we know the actual type is correct */
- }
- else if ( (type & PGT_va_mask) != PGT_va_mutable )
- {
- ASSERT((type & PGT_va_mask) != (x & PGT_va_mask));
-
- /* This table is possibly mapped at multiple locations. */
- nx &= ~PGT_va_mask;
- nx |= PGT_va_unknown;
- }
- }
- if ( unlikely(!(x & PGT_validated)) )
- {
- /* Someone else is updating validation of this page. Wait... */
- while ( (y = page->u.inuse.type_info) == x )
- cpu_relax();
- goto again;
- }
+ else if ( unlikely((x & PGT_type_mask) != type) )
+ {
+ return 0;
+ }
+ if ( unlikely(!(x & PGT_validated)) )
+ {
+ /* Someone else is updating validation of this page. Wait... */
+ while ( (y = page->u.inuse.type_info) == x )
+ cpu_relax();
+ goto again;
}
}
while ( unlikely((y = cmpxchg(&page->u.inuse.type_info, x, nx)) != x) );
diff -r d59d6a440a41 -r dc9fa4dcd19c xen/arch/x86/domain_build.c
--- a/xen/arch/x86/domain_build.c Fri Sep 15 23:54:04 2006 +0100
+++ b/xen/arch/x86/domain_build.c Mon Sep 18 14:15:03 2006 +0100
@@ -510,15 +510,13 @@ int construct_dom0(struct domain *d,
case 1 ... 4:
page->u.inuse.type_info &= ~PGT_type_mask;
page->u.inuse.type_info |= PGT_l2_page_table;
- page->u.inuse.type_info |=
- (count-1) << PGT_va_shift;
+ if ( count == 4 )
+ page->u.inuse.type_info |= PGT_pae_xen_l2;
get_page(page, d); /* an extra ref because of readable mapping */
break;
default:
page->u.inuse.type_info &= ~PGT_type_mask;
page->u.inuse.type_info |= PGT_l1_page_table;
- page->u.inuse.type_info |=
- ((dsi.v_start>>L2_PAGETABLE_SHIFT)+(count-5))<<PGT_va_shift;
get_page(page, d); /* an extra ref because of readable mapping */
break;
}
@@ -544,8 +542,6 @@ int construct_dom0(struct domain *d,
{
page->u.inuse.type_info &= ~PGT_type_mask;
page->u.inuse.type_info |= PGT_l1_page_table;
- page->u.inuse.type_info |=
- ((dsi.v_start>>L2_PAGETABLE_SHIFT)+(count-1))<<PGT_va_shift;
/*
* No longer writable: decrement the type_count.
diff -r d59d6a440a41 -r dc9fa4dcd19c xen/arch/x86/mm.c
--- a/xen/arch/x86/mm.c Fri Sep 15 23:54:04 2006 +0100
+++ b/xen/arch/x86/mm.c Mon Sep 18 14:15:03 2006 +0100
@@ -625,8 +625,7 @@ get_page_from_l1e(
/* NB. Virtual address 'l2e' maps to a machine address within frame 'pfn'. */
static int
get_page_from_l2e(
- l2_pgentry_t l2e, unsigned long pfn,
- struct domain *d, unsigned long vaddr)
+ l2_pgentry_t l2e, unsigned long pfn, struct domain *d)
{
int rc;
@@ -639,10 +638,7 @@ get_page_from_l2e(
return 0;
}
- vaddr >>= L2_PAGETABLE_SHIFT;
- vaddr <<= PGT_va_shift;
- rc = get_page_and_type_from_pagenr(
- l2e_get_pfn(l2e), PGT_l1_page_table | vaddr, d);
+ rc = get_page_and_type_from_pagenr(l2e_get_pfn(l2e), PGT_l1_page_table, d);
#if CONFIG_PAGING_LEVELS == 2
if ( unlikely(!rc) )
rc = get_linear_pagetable(l2e, pfn, d);
@@ -654,8 +650,7 @@ get_page_from_l2e(
#if CONFIG_PAGING_LEVELS >= 3
static int
get_page_from_l3e(
- l3_pgentry_t l3e, unsigned long pfn,
- struct domain *d, unsigned long vaddr)
+ l3_pgentry_t l3e, unsigned long pfn, struct domain *d)
{
int rc;
@@ -668,11 +663,7 @@ get_page_from_l3e(
return 0;
}
- vaddr >>= L3_PAGETABLE_SHIFT;
- vaddr <<= PGT_va_shift;
- rc = get_page_and_type_from_pagenr(
- l3e_get_pfn(l3e),
- PGT_l2_page_table | vaddr, d);
+ rc = get_page_and_type_from_pagenr(l3e_get_pfn(l3e), PGT_l2_page_table, d);
return rc;
}
#endif /* 3 level */
@@ -680,8 +671,7 @@ get_page_from_l3e(
#if CONFIG_PAGING_LEVELS >= 4
static int
get_page_from_l4e(
- l4_pgentry_t l4e, unsigned long pfn,
- struct domain *d, unsigned long vaddr)
+ l4_pgentry_t l4e, unsigned long pfn, struct domain *d)
{
int rc;
@@ -694,11 +684,7 @@ get_page_from_l4e(
return 0;
}
- vaddr >>= L4_PAGETABLE_SHIFT;
- vaddr <<= PGT_va_shift;
- rc = get_page_and_type_from_pagenr(
- l4e_get_pfn(l4e),
- PGT_l3_page_table | vaddr, d);
+ rc = get_page_and_type_from_pagenr(l4e_get_pfn(l4e), PGT_l3_page_table, d);
if ( unlikely(!rc) )
rc = get_linear_pagetable(l4e, pfn, d);
@@ -877,8 +863,8 @@ static int create_pae_xen_mappings(l3_pg
/*
* The Xen-private mappings include linear mappings. The L2 thus cannot
* be shared by multiple L3 tables. The test here is adequate because:
- * 1. Cannot appear in slots != 3 because the page would then then have
- * unknown va backpointer, which get_page_type() explicitly disallows.
+ * 1. Cannot appear in slots != 3 because get_page_type() checks the
+ * PGT_pae_xen_l2 flag, which is asserted iff the L2 appears in slot 3
* 2. Cannot appear in another page table's L3:
* a. alloc_l3_table() calls this function and this check will fail
* b. mod_l3_entry() disallows updates to slot 3 in an existing table
@@ -888,6 +874,7 @@ static int create_pae_xen_mappings(l3_pg
page = l3e_get_page(l3e3);
BUG_ON(page->u.inuse.type_info & PGT_pinned);
BUG_ON((page->u.inuse.type_info & PGT_count_mask) == 0);
+ BUG_ON(!(page->u.inuse.type_info & PGT_pae_xen_l2));
if ( (page->u.inuse.type_info & PGT_count_mask) != 1 )
{
MEM_LOG("PAE L3 3rd slot is shared");
@@ -949,61 +936,17 @@ static void pae_flush_pgd(
flush_tlb_mask(d->domain_dirty_cpumask);
}
-static inline int l1_backptr(
- unsigned long *backptr, unsigned long offset_in_l2, unsigned long l2_type)
-{
- unsigned long l2_backptr = l2_type & PGT_va_mask;
- ASSERT(l2_backptr != PGT_va_unknown);
- ASSERT(l2_backptr != PGT_va_mutable);
- *backptr =
- ((l2_backptr >> PGT_va_shift) << L3_PAGETABLE_SHIFT) |
- (offset_in_l2 << L2_PAGETABLE_SHIFT);
- return 1;
-}
-
#elif CONFIG_X86_64
# define create_pae_xen_mappings(pl3e) (1)
# define pae_flush_pgd(mfn, idx, nl3e) ((void)0)
-
-static inline int l1_backptr(
- unsigned long *backptr, unsigned long offset_in_l2, unsigned long l2_type)
-{
- unsigned long l2_backptr = l2_type & PGT_va_mask;
- ASSERT(l2_backptr != PGT_va_unknown);
- ASSERT(l2_backptr != PGT_va_mutable);
- *backptr = ((l2_backptr >> PGT_va_shift) << L3_PAGETABLE_SHIFT) |
- (offset_in_l2 << L2_PAGETABLE_SHIFT);
- return 1;
-}
-
-static inline int l2_backptr(
- unsigned long *backptr, unsigned long offset_in_l3, unsigned long l3_type)
-{
- unsigned long l3_backptr = l3_type & PGT_va_mask;
- ASSERT(l3_backptr != PGT_va_unknown);
- ASSERT(l3_backptr != PGT_va_mutable);
- *backptr = ((l3_backptr >> PGT_va_shift) << L4_PAGETABLE_SHIFT) |
- (offset_in_l3 << L3_PAGETABLE_SHIFT);
- return 1;
-}
-
-static inline int l3_backptr(
- unsigned long *backptr, unsigned long offset_in_l4, unsigned long l4_type)
-{
- *backptr = (offset_in_l4 << L4_PAGETABLE_SHIFT);
- return 1;
-}
#else
# define create_pae_xen_mappings(pl3e) (1)
-# define l1_backptr(bp,l2o,l2t) \
- ({ *(bp) = (unsigned long)(l2o) << L2_PAGETABLE_SHIFT; 1; })
#endif
static int alloc_l2_table(struct page_info *page, unsigned long type)
{
struct domain *d = page_get_owner(page);
unsigned long pfn = page_to_mfn(page);
- unsigned long vaddr;
l2_pgentry_t *pl2e;
int i;
@@ -1013,10 +956,8 @@ static int alloc_l2_table(struct page_in
for ( i = 0; i < L2_PAGETABLE_ENTRIES; i++ )
{
- if ( !l1_backptr(&vaddr, i, type) )
- goto fail;
if ( is_guest_l2_slot(type, i) &&
- unlikely(!get_page_from_l2e(pl2e[i], pfn, d, vaddr)) )
+ unlikely(!get_page_from_l2e(pl2e[i], pfn, d)) )
goto fail;
adjust_guest_l2e(pl2e[i]);
@@ -1051,11 +992,10 @@ static int alloc_l2_table(struct page_in
#if CONFIG_PAGING_LEVELS >= 3
-static int alloc_l3_table(struct page_info *page, unsigned long type)
+static int alloc_l3_table(struct page_info *page)
{
struct domain *d = page_get_owner(page);
unsigned long pfn = page_to_mfn(page);
- unsigned long vaddr;
l3_pgentry_t *pl3e;
int i;
@@ -1079,14 +1019,21 @@ static int alloc_l3_table(struct page_in
pl3e = map_domain_page(pfn);
for ( i = 0; i < L3_PAGETABLE_ENTRIES; i++ )
{
-#if CONFIG_PAGING_LEVELS >= 4
- if ( !l2_backptr(&vaddr, i, type) )
- goto fail;
-#else
- vaddr = (unsigned long)i << L3_PAGETABLE_SHIFT;
+#ifdef CONFIG_X86_PAE
+ if ( i == 3 )
+ {
+ if ( !(l3e_get_flags(pl3e[i]) & _PAGE_PRESENT) ||
+ (l3e_get_flags(pl3e[i]) & L3_DISALLOW_MASK) ||
+ !get_page_and_type_from_pagenr(l3e_get_pfn(pl3e[i]),
+ PGT_l2_page_table |
+ PGT_pae_xen_l2,
+ d) )
+ goto fail;
+ }
+ else
#endif
if ( is_guest_l3_slot(i) &&
- unlikely(!get_page_from_l3e(pl3e[i], pfn, d, vaddr)) )
+ unlikely(!get_page_from_l3e(pl3e[i], pfn, d)) )
goto fail;
adjust_guest_l3e(pl3e[i]);
@@ -1108,27 +1055,23 @@ static int alloc_l3_table(struct page_in
return 0;
}
#else
-#define alloc_l3_table(page, type) (0)
+#define alloc_l3_table(page) (0)
#endif
#if CONFIG_PAGING_LEVELS >= 4
-static int alloc_l4_table(struct page_info *page, unsigned long type)
+static int alloc_l4_table(struct page_info *page)
{
struct domain *d = page_get_owner(page);
unsigned long pfn = page_to_mfn(page);
l4_pgentry_t *pl4e = page_to_virt(page);
- unsigned long vaddr;
int i;
ASSERT(!shadow_mode_refcounts(d));
for ( i = 0; i < L4_PAGETABLE_ENTRIES; i++ )
{
- if ( !l3_backptr(&vaddr, i, type) )
- goto fail;
-
if ( is_guest_l4_slot(i) &&
- unlikely(!get_page_from_l4e(pl4e[i], pfn, d, vaddr)) )
+ unlikely(!get_page_from_l4e(pl4e[i], pfn, d)) )
goto fail;
adjust_guest_l4e(pl4e[i]);
@@ -1156,7 +1099,7 @@ static int alloc_l4_table(struct page_in
return 0;
}
#else
-#define alloc_l4_table(page, type) (0)
+#define alloc_l4_table(page) (0)
#endif
@@ -1190,6 +1133,8 @@ static void free_l2_table(struct page_in
put_page_from_l2e(pl2e[i], pfn);
unmap_domain_page(pl2e);
+
+ page->u.inuse.type_info &= ~PGT_pae_xen_l2;
}
@@ -1357,7 +1302,6 @@ static int mod_l2_entry(l2_pgentry_t *pl
unsigned long type)
{
l2_pgentry_t ol2e;
- unsigned long vaddr = 0;
if ( unlikely(!is_guest_l2_slot(type,pgentry_ptr_to_slot(pl2e))) )
{
@@ -1383,8 +1327,7 @@ static int mod_l2_entry(l2_pgentry_t *pl
if ( !l2e_has_changed(ol2e, nl2e, _PAGE_PRESENT))
return UPDATE_ENTRY(l2, pl2e, ol2e, nl2e, pfn);
- if ( unlikely(!l1_backptr(&vaddr, pgentry_ptr_to_slot(pl2e), type)) ||
- unlikely(!get_page_from_l2e(nl2e, pfn, current->domain, vaddr)) )
+ if ( unlikely(!get_page_from_l2e(nl2e, pfn, current->domain)) )
return 0;
if ( unlikely(!UPDATE_ENTRY(l2, pl2e, ol2e, nl2e, pfn)) )
@@ -1407,11 +1350,9 @@ static int mod_l2_entry(l2_pgentry_t *pl
/* Update the L3 entry at pl3e to new value nl3e. pl3e is within frame pfn. */
static int mod_l3_entry(l3_pgentry_t *pl3e,
l3_pgentry_t nl3e,
- unsigned long pfn,
- unsigned long type)
+ unsigned long pfn)
{
l3_pgentry_t ol3e;
- unsigned long vaddr;
int okay;
if ( unlikely(!is_guest_l3_slot(pgentry_ptr_to_slot(pl3e))) )
@@ -1447,16 +1388,8 @@ static int mod_l3_entry(l3_pgentry_t *pl
if (!l3e_has_changed(ol3e, nl3e, _PAGE_PRESENT))
return UPDATE_ENTRY(l3, pl3e, ol3e, nl3e, pfn);
-#if CONFIG_PAGING_LEVELS >= 4
- if ( unlikely(!l2_backptr(&vaddr, pgentry_ptr_to_slot(pl3e), type)) ||
- unlikely(!get_page_from_l3e(nl3e, pfn, current->domain, vaddr)) )
+ if ( unlikely(!get_page_from_l3e(nl3e, pfn, current->domain)) )
return 0;
-#else
- vaddr = (((unsigned long)pl3e & ~PAGE_MASK) / sizeof(l3_pgentry_t))
- << L3_PAGETABLE_SHIFT;
- if ( unlikely(!get_page_from_l3e(nl3e, pfn, current->domain, vaddr)) )
- return 0;
-#endif
if ( unlikely(!UPDATE_ENTRY(l3, pl3e, ol3e, nl3e, pfn)) )
{
@@ -1485,11 +1418,9 @@ static int mod_l3_entry(l3_pgentry_t *pl
/* Update the L4 entry at pl4e to new value nl4e. pl4e is within frame pfn. */
static int mod_l4_entry(l4_pgentry_t *pl4e,
l4_pgentry_t nl4e,
- unsigned long pfn,
- unsigned long type)
+ unsigned long pfn)
{
l4_pgentry_t ol4e;
- unsigned long vaddr;
if ( unlikely(!is_guest_l4_slot(pgentry_ptr_to_slot(pl4e))) )
{
@@ -1515,8 +1446,7 @@ static int mod_l4_entry(l4_pgentry_t *pl
if (!l4e_has_changed(ol4e, nl4e, _PAGE_PRESENT))
return UPDATE_ENTRY(l4, pl4e, ol4e, nl4e, pfn);
- if ( unlikely(!l3_backptr(&vaddr, pgentry_ptr_to_slot(pl4e), type)) ||
- unlikely(!get_page_from_l4e(nl4e, pfn, current->domain, vaddr)) )
+ if ( unlikely(!get_page_from_l4e(nl4e, pfn, current->domain)) )
return 0;
if ( unlikely(!UPDATE_ENTRY(l4, pl4e, ol4e, nl4e, pfn)) )
@@ -1550,9 +1480,9 @@ int alloc_page_type(struct page_info *pa
case PGT_l2_page_table:
return alloc_l2_table(page, type);
case PGT_l3_page_table:
- return alloc_l3_table(page, type);
+ return alloc_l3_table(page);
case PGT_l4_page_table:
- return alloc_l4_table(page, type);
+ return alloc_l4_table(page);
case PGT_gdt_page:
case PGT_ldt_page:
return alloc_segdesc_page(page);
@@ -1639,15 +1569,6 @@ void put_page_type(struct page_info *pag
nx = x - 1;
ASSERT((x & PGT_count_mask) != 0);
-
- /*
- * The page should always be validated while a reference is held. The
- * exception is during domain destruction, when we forcibly invalidate
- * page-table pages if we detect a referential loop.
- * See domain.c:relinquish_list().
- */
- ASSERT((x & PGT_validated) ||
- test_bit(_DOMF_dying, &page_get_owner(page)->domain_flags));
if ( unlikely((nx & PGT_count_mask) == 0) )
{
@@ -1672,12 +1593,6 @@ void put_page_type(struct page_info *pag
/* Record TLB information for flush later. */
page->tlbflush_timestamp = tlbflush_current_time();
}
- else if ( unlikely((nx & (PGT_pinned|PGT_type_mask|PGT_count_mask)) ==
- (PGT_pinned|PGT_l1_page_table|1)) )
- {
- /* Page is now only pinned. Make the back pointer mutable again. */
- nx |= PGT_va_mutable;
- }
}
while ( unlikely((y = cmpxchg(&page->u.inuse.type_info, x, nx)) != x) );
}
@@ -1686,6 +1601,8 @@ int get_page_type(struct page_info *page
int get_page_type(struct page_info *page, unsigned long type)
{
unsigned long nx, x, y = page->u.inuse.type_info;
+
+ ASSERT(!(type & ~(PGT_type_mask | PGT_pae_xen_l2)));
again:
do {
@@ -1698,29 +1615,26 @@ int get_page_type(struct page_info *page
}
else if ( unlikely((x & PGT_count_mask) == 0) )
{
- if ( (x & (PGT_type_mask|PGT_va_mask)) != type )
+ ASSERT(!(x & PGT_pae_xen_l2));
+ if ( (x & PGT_type_mask) != type )
{
- if ( (x & PGT_type_mask) != (type & PGT_type_mask) )
+ /*
+ * On type change we check to flush stale TLB entries. This
+ * may be unnecessary (e.g., page was GDT/LDT) but those
+ * circumstances should be very rare.
+ */
+ cpumask_t mask =
+ page_get_owner(page)->domain_dirty_cpumask;
+ tlbflush_filter(mask, page->tlbflush_timestamp);
+
+ if ( unlikely(!cpus_empty(mask)) )
{
- /*
- * On type change we check to flush stale TLB
- * entries. This may be unnecessary (e.g., page
- * was GDT/LDT) but those circumstances should be
- * very rare.
- */
- cpumask_t mask =
- page_get_owner(page)->domain_dirty_cpumask;
- tlbflush_filter(mask, page->tlbflush_timestamp);
-
- if ( unlikely(!cpus_empty(mask)) )
- {
- perfc_incrc(need_flush_tlb_flush);
- flush_tlb_mask(mask);
- }
+ perfc_incrc(need_flush_tlb_flush);
+ flush_tlb_mask(mask);
}
/* We lose existing type, back pointer, and validity. */
- nx &= ~(PGT_type_mask | PGT_va_mask | PGT_validated);
+ nx &= ~(PGT_type_mask | PGT_validated);
nx |= type;
/* No special validation needed for writable pages. */
@@ -1729,51 +1643,23 @@ int get_page_type(struct page_info *page
nx |= PGT_validated;
}
}
- else
- {
- if ( unlikely((x & (PGT_type_mask|PGT_va_mask)) != type) )
- {
- if ( unlikely((x & PGT_type_mask) != (type & PGT_type_mask) ) )
- {
- if ( ((x & PGT_type_mask) != PGT_l2_page_table) ||
- ((type & PGT_type_mask) != PGT_l1_page_table) )
- MEM_LOG("Bad type (saw %" PRtype_info
- " != exp %" PRtype_info ") "
- "for mfn %lx (pfn %lx)",
- x, type, page_to_mfn(page),
- get_gpfn_from_mfn(page_to_mfn(page)));
- return 0;
- }
- else if ( (x & PGT_va_mask) == PGT_va_mutable )
- {
- /* The va backpointer is mutable, hence we update it. */
- nx &= ~PGT_va_mask;
- nx |= type; /* we know the actual type is correct */
- }
- else if ( (type & PGT_va_mask) != PGT_va_mutable )
- {
- ASSERT((type & PGT_va_mask) != (x & PGT_va_mask));
-#ifdef CONFIG_X86_PAE
- /* We use backptr as extra typing. Cannot be unknown. */
- if ( (type & PGT_type_mask) == PGT_l2_page_table )
- return 0;
-#endif
- /* Fixme: add code to propagate va_unknown to subtables. */
- if ( ((type & PGT_type_mask) >= PGT_l2_page_table) &&
- !shadow_mode_refcounts(page_get_owner(page)) )
- return 0;
- /* This table is possibly mapped at multiple locations. */
- nx &= ~PGT_va_mask;
- nx |= PGT_va_unknown;
- }
- }
- if ( unlikely(!(x & PGT_validated)) )
- {
- /* Someone else is updating validation of this page. Wait... */
- while ( (y = page->u.inuse.type_info) == x )
- cpu_relax();
- goto again;
- }
+ else if ( unlikely((x & (PGT_type_mask|PGT_pae_xen_l2)) != type) )
+ {
+ if ( ((x & PGT_type_mask) != PGT_l2_page_table) ||
+ (type != PGT_l1_page_table) )
+ MEM_LOG("Bad type (saw %" PRtype_info
+ " != exp %" PRtype_info ") "
+ "for mfn %lx (pfn %lx)",
+ x, type, page_to_mfn(page),
+ get_gpfn_from_mfn(page_to_mfn(page)));
+ return 0;
+ }
+ else if ( unlikely(!(x & PGT_validated)) )
+ {
+ /* Someone else is updating validation of this page. Wait... */
+ while ( (y = page->u.inuse.type_info) == x )
+ cpu_relax();
+ goto again;
}
}
while ( unlikely((y = cmpxchg(&page->u.inuse.type_info, x, nx)) != x) );
@@ -2030,19 +1916,25 @@ int do_mmuext_op(
switch ( op.cmd )
{
case MMUEXT_PIN_L1_TABLE:
- type = PGT_l1_page_table | PGT_va_mutable;
+ type = PGT_l1_page_table;
goto pin_page;
case MMUEXT_PIN_L2_TABLE:
+ type = PGT_l2_page_table;
+ goto pin_page;
+
case MMUEXT_PIN_L3_TABLE:
+ type = PGT_l3_page_table;
+ goto pin_page;
+
case MMUEXT_PIN_L4_TABLE:
- /* Ignore pinning of subdirectories. */
- if ( (op.cmd - MMUEXT_PIN_L1_TABLE) != (CONFIG_PAGING_LEVELS - 1) )
+ type = PGT_l4_page_table;
+
+ pin_page:
+ /* Ignore pinning of invalid paging levels. */
+ if ( (op.cmd - MMUEXT_PIN_L1_TABLE) > (CONFIG_PAGING_LEVELS - 1) )
break;
- type = PGT_root_page_table;
-
- pin_page:
if ( shadow_mode_refcounts(FOREIGNDOM) )
break;
@@ -2326,7 +2218,7 @@ int do_mmu_update(
}
if ( unlikely(!get_page_type(
- page, type_info & (PGT_type_mask|PGT_va_mask))) )
+ page, type_info & (PGT_type_mask|PGT_pae_xen_l2))) )
goto not_a_pt;
switch ( type_info & PGT_type_mask )
@@ -2348,7 +2240,7 @@ int do_mmu_update(
case PGT_l3_page_table:
{
l3_pgentry_t l3e = l3e_from_intpte(req.val);
- okay = mod_l3_entry(va, l3e, mfn, type_info);
+ okay = mod_l3_entry(va, l3e, mfn);
}
break;
#endif
@@ -2356,7 +2248,7 @@ int do_mmu_update(
case PGT_l4_page_table:
{
l4_pgentry_t l4e = l4e_from_intpte(req.val);
- okay = mod_l4_entry(va, l4e, mfn, type_info);
+ okay = mod_l4_entry(va, l4e, mfn);
}
break;
#endif
@@ -2454,7 +2346,7 @@ static int create_grant_pte_mapping(
void *va;
unsigned long gmfn, mfn;
struct page_info *page;
- u32 type_info;
+ u32 type;
l1_pgentry_t ol1e;
struct domain *d = v->domain;
@@ -2475,9 +2367,8 @@ static int create_grant_pte_mapping(
va = (void *)((unsigned long)va + (pte_addr & ~PAGE_MASK));
page = mfn_to_page(mfn);
- type_info = page->u.inuse.type_info;
- if ( ((type_info & PGT_type_mask) != PGT_l1_page_table) ||
- !get_page_type(page, type_info & (PGT_type_mask|PGT_va_mask)) )
+ type = page->u.inuse.type_info & PGT_type_mask;
+ if ( (type != PGT_l1_page_table) || !get_page_type(page, type) )
{
MEM_LOG("Grant map attempted to update a non-L1 page");
rc = GNTST_general_error;
@@ -2511,7 +2402,7 @@ static int destroy_grant_pte_mapping(
void *va;
unsigned long gmfn, mfn;
struct page_info *page;
- u32 type_info;
+ u32 type;
l1_pgentry_t ol1e;
gmfn = addr >> PAGE_SHIFT;
@@ -2527,9 +2418,8 @@ static int destroy_grant_pte_mapping(
va = (void *)((unsigned long)va + (addr & ~PAGE_MASK));
page = mfn_to_page(mfn);
- type_info = page->u.inuse.type_info;
- if ( ((type_info & PGT_type_mask) != PGT_l1_page_table) ||
- !get_page_type(page, type_info & (PGT_type_mask|PGT_va_mask)) )
+ type = page->u.inuse.type_info & PGT_type_mask;
+ if ( (type != PGT_l1_page_table) || !get_page_type(page, type) )
{
MEM_LOG("Grant map attempted to update a non-L1 page");
rc = GNTST_general_error;
diff -r d59d6a440a41 -r dc9fa4dcd19c xen/arch/x86/mm/shadow/common.c
--- a/xen/arch/x86/mm/shadow/common.c Fri Sep 15 23:54:04 2006 +0100
+++ b/xen/arch/x86/mm/shadow/common.c Mon Sep 18 14:15:03 2006 +0100
@@ -21,8 +21,6 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
-#define SHADOW 1
-
#include <xen/config.h>
#include <xen/types.h>
#include <xen/mm.h>
@@ -225,7 +223,6 @@ struct x86_emulate_ops shadow_emulator_o
.cmpxchg8b_emulated = sh_x86_emulate_cmpxchg8b_emulated,
};
-
/**************************************************************************/
/* Code for "promoting" a guest page to the point where the shadow code is
* willing to let it be treated as a guest page table. This generally
@@ -252,8 +249,8 @@ void shadow_promote(struct vcpu *v, mfn_
// count to be > 0.
//
do {
- type_info =
- page->u.inuse.type_info & (PGT_type_mask | PGT_va_mask);
+ type_info = page->u.inuse.type_info &
+ (PGT_type_mask | PGT_pae_xen_l2);
} while ( !get_page_type(page, type_info) );
// Now that the type ref is non-zero, we can safely use the
diff -r d59d6a440a41 -r dc9fa4dcd19c xen/arch/x86/mm/shadow/multi.c
--- a/xen/arch/x86/mm/shadow/multi.c Fri Sep 15 23:54:04 2006 +0100
+++ b/xen/arch/x86/mm/shadow/multi.c Mon Sep 18 14:15:03 2006 +0100
@@ -34,8 +34,6 @@
// - Want to map the P2M table into the 16MB RO_MPT hole in Xen's address
// space for both PV and HVM guests.
//
-
-#define SHADOW 1
#include <xen/config.h>
#include <xen/types.h>
diff -r d59d6a440a41 -r dc9fa4dcd19c xen/include/asm-ia64/mm.h
--- a/xen/include/asm-ia64/mm.h Fri Sep 15 23:54:04 2006 +0100
+++ b/xen/include/asm-ia64/mm.h Mon Sep 18 14:15:03 2006 +0100
@@ -102,14 +102,6 @@ struct page_info
/* Owning guest has pinned this page to its current type? */
#define _PGT_pinned 27
#define PGT_pinned (1U<<_PGT_pinned)
-
- /* The 27 most significant bits of virt address if this is a page table. */
-#define PGT_va_shift 32
-#define PGT_va_mask ((unsigned long)((1U<<28)-1)<<PGT_va_shift)
- /* Is the back pointer still mutable (i.e. not fixed yet)? */
-#define PGT_va_mutable ((unsigned long)((1U<<28)-1)<<PGT_va_shift)
- /* Is the back pointer unknown (e.g., p.t. is mapped at multiple VAs)? */
-#define PGT_va_unknown ((unsigned long)((1U<<28)-2)<<PGT_va_shift)
/* 16-bit count of uses of this frame as its current type. */
#define PGT_count_mask ((1U<<16)-1)
diff -r d59d6a440a41 -r dc9fa4dcd19c xen/include/asm-powerpc/mm.h
--- a/xen/include/asm-powerpc/mm.h Fri Sep 15 23:54:04 2006 +0100
+++ b/xen/include/asm-powerpc/mm.h Mon Sep 18 14:15:03 2006 +0100
@@ -101,14 +101,6 @@ struct page_extents {
/* Has this page been validated for use as its current type? */
#define _PGT_validated 27
#define PGT_validated (1U<<_PGT_validated)
-
- /* The 27 most significant bits of virt address if this is a page table. */
-#define PGT_va_shift 32
-#define PGT_va_mask ((unsigned long)((1U<<28)-1)<<PGT_va_shift)
- /* Is the back pointer still mutable (i.e. not fixed yet)? */
-#define PGT_va_mutable ((unsigned long)((1U<<28)-1)<<PGT_va_shift)
- /* Is the back pointer unknown (e.g., p.t. is mapped at multiple VAs)? */
-#define PGT_va_unknown ((unsigned long)((1U<<28)-2)<<PGT_va_shift)
/* 16-bit count of uses of this frame as its current type. */
#define PGT_count_mask ((1U<<16)-1)
diff -r d59d6a440a41 -r dc9fa4dcd19c xen/include/asm-x86/mm.h
--- a/xen/include/asm-x86/mm.h Fri Sep 15 23:54:04 2006 +0100
+++ b/xen/include/asm-x86/mm.h Mon Sep 18 14:15:03 2006 +0100
@@ -75,19 +75,6 @@ struct page_info
#define PGT_gdt_page (5U<<29) /* using this page in a GDT? */
#define PGT_ldt_page (6U<<29) /* using this page in an LDT? */
#define PGT_writable_page (7U<<29) /* has writable mappings of this page? */
-
-#ifndef SHADOW
-#define PGT_l1_shadow PGT_l1_page_table
-#define PGT_l2_shadow PGT_l2_page_table
-#define PGT_l3_shadow PGT_l3_page_table
-#define PGT_l4_shadow PGT_l4_page_table
-#define PGT_hl2_shadow (5U<<29)
-#define PGT_snapshot (6U<<29)
-#define PGT_writable_pred (7U<<29) /* predicted gpfn with writable ref */
-
-#define PGT_fl1_shadow (5U<<29)
-#endif
-
#define PGT_type_mask (7U<<29) /* Bits 29-31. */
/* Owning guest has pinned this page to its current type? */
@@ -96,43 +83,12 @@ struct page_info
/* Has this page been validated for use as its current type? */
#define _PGT_validated 27
#define PGT_validated (1U<<_PGT_validated)
-#if defined(__i386__)
- /* The 11 most significant bits of virt address if this is a page table. */
-#define PGT_va_shift 16
-#define PGT_va_mask (((1U<<11)-1)<<PGT_va_shift)
- /* Is the back pointer still mutable (i.e. not fixed yet)? */
-#define PGT_va_mutable (((1U<<11)-1)<<PGT_va_shift)
- /* Is the back pointer unknown (e.g., p.t. is mapped at multiple VAs)? */
-#define PGT_va_unknown (((1U<<11)-2)<<PGT_va_shift)
-#elif defined(__x86_64__)
- /* The 27 most significant bits of virt address if this is a page table. */
-#define PGT_va_shift 32
-#define PGT_va_mask ((unsigned long)((1U<<28)-1)<<PGT_va_shift)
- /* Is the back pointer still mutable (i.e. not fixed yet)? */
-#define PGT_va_mutable ((unsigned long)((1U<<28)-1)<<PGT_va_shift)
- /* Is the back pointer unknown (e.g., p.t. is mapped at multiple VAs)? */
-#define PGT_va_unknown ((unsigned long)((1U<<28)-2)<<PGT_va_shift)
-#endif
+ /* PAE only: is this an L2 page directory containing Xen-private mappings? */
+#define _PGT_pae_xen_l2 26
+#define PGT_pae_xen_l2 (1U<<_PGT_pae_xen_l2)
/* 16-bit count of uses of this frame as its current type. */
#define PGT_count_mask ((1U<<16)-1)
-
-#ifndef SHADOW
-#ifdef __x86_64__
-#define PGT_high_mfn_shift 52
-#define PGT_high_mfn_mask (0xfffUL << PGT_high_mfn_shift)
-#define PGT_mfn_mask (((1U<<27)-1) | PGT_high_mfn_mask)
-#define PGT_high_mfn_nx (0x800UL << PGT_high_mfn_shift)
-#else
- /* 23-bit mfn mask for shadow types: good for up to 32GB RAM. */
-#define PGT_mfn_mask ((1U<<23)-1)
- /* NX for PAE xen is not supported yet */
-#define PGT_high_mfn_nx (1ULL << 63)
-
-#define PGT_score_shift 23
-#define PGT_score_mask (((1U<<4)-1)<<PGT_score_shift)
-#endif
-#endif /* SHADOW */
/* Cleared when the owning guest 'frees' this page. */
#define _PGC_allocated 31
diff -r d59d6a440a41 -r dc9fa4dcd19c xen/include/asm-x86/x86_32/page-3level.h
--- a/xen/include/asm-x86/x86_32/page-3level.h Fri Sep 15 23:54:04 2006 +0100
+++ b/xen/include/asm-x86/x86_32/page-3level.h Mon Sep 18 14:15:03 2006 +0100
@@ -49,7 +49,7 @@ typedef l3_pgentry_t root_pgentry_t;
/* misc */
#define is_guest_l1_slot(s) (1)
#define is_guest_l2_slot(t,s) \
- ( ((((t) & PGT_va_mask) >> PGT_va_shift) != 3) || \
+ ( !((t) & PGT_pae_xen_l2) || \
((s) < (L2_PAGETABLE_FIRST_XEN_SLOT & (L2_PAGETABLE_ENTRIES - 1))) )
#define is_guest_l3_slot(s) (1)
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