diff options
Diffstat (limited to 'include/asm-i386')
| -rw-r--r-- | include/asm-i386/pgtable.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/asm-i386/pgtable.h b/include/asm-i386/pgtable.h index 8cb708a6bed..7d398f493dd 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); } /* |