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-rw-r--r--include/asm-i386/pgtable.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/include/asm-i386/pgtable.h b/include/asm-i386/pgtable.h
index 8cb708a6bed0..7d398f493dde 100644
--- a/include/asm-i386/pgtable.h
+++ b/include/asm-i386/pgtable.h
@@ -247,6 +247,23 @@ static inline pte_t pte_mkhuge(pte_t pte) { (pte).pte_low |= _PAGE_PSE; return p
#endif
/*
+ * Rules for using pte_update - it must be called after any PTE update which
+ * has not been done using the set_pte / clear_pte interfaces. It is used by
+ * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
+ * updates should either be sets, clears, or set_pte_atomic for P->P
+ * transitions, which means this hook should only be called for user PTEs.
+ * This hook implies a P->P protection or access change has taken place, which
+ * requires a subsequent TLB flush. The notification can optionally be delayed
+ * until the TLB flush event by using the pte_update_defer form of the
+ * interface, but care must be taken to assure that the flush happens while
+ * still holding the same page table lock so that the shadow and primary pages
+ * do not become out of sync on SMP.
+ */
+#define pte_update(mm, addr, ptep) do { } while (0)
+#define pte_update_defer(mm, addr, ptep) do { } while (0)
+
+
+/*
* We only update the dirty/accessed state if we set
* the dirty bit by hand in the kernel, since the hardware
* will do the accessed bit for us, and we don't want to
@@ -258,6 +275,7 @@ static inline pte_t pte_mkhuge(pte_t pte) { (pte).pte_low |= _PAGE_PSE; return p
do { \
if (dirty) { \
(ptep)->pte_low = (entry).pte_low; \
+ pte_update_defer((vma)->vm_mm, (addr), (ptep)); \
flush_tlb_page(vma, address); \
} \
} while (0)
@@ -287,6 +305,7 @@ do { \
__dirty = pte_dirty(*(ptep)); \
if (__dirty) { \
clear_bit(_PAGE_BIT_DIRTY, &(ptep)->pte_low); \
+ pte_update_defer((vma)->vm_mm, (addr), (ptep)); \
flush_tlb_page(vma, address); \
} \
__dirty; \
@@ -299,6 +318,7 @@ do { \
__young = pte_young(*(ptep)); \
if (__young) { \
clear_bit(_PAGE_BIT_ACCESSED, &(ptep)->pte_low); \
+ pte_update_defer((vma)->vm_mm, (addr), (ptep)); \
flush_tlb_page(vma, address); \
} \
__young; \
@@ -321,6 +341,7 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, unsigned long
static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
clear_bit(_PAGE_BIT_RW, &ptep->pte_low);
+ pte_update(mm, addr, ptep);
}
/*

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