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KVM: MMU: When updating the dirty bit, inform the mmu about it

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Since the mmu uses different shadow pages for dirty large pages and clean
large pages, this allows the mmu to drop ptes that are now invalid.

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2007-10-11 15:30:21 +02:00
parent 5df34a86f9
commit c4fcc27246
1 changed files with 5 additions and 0 deletions
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5
drivers/kvm/paging_tmpl.h
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@ -74,9 +74,14 @@ static void FNAME(update_dirty_bit)(struct kvm_vcpu *vcpu,
pt_element_t *ptep, pt_element_t *ptep,
gfn_t table_gfn) gfn_t table_gfn)
{ {
gpa_t pte_gpa;
if (write_fault && !is_dirty_pte(*ptep)) { if (write_fault && !is_dirty_pte(*ptep)) {
mark_page_dirty(vcpu->kvm, table_gfn); mark_page_dirty(vcpu->kvm, table_gfn);
*ptep |= PT_DIRTY_MASK; *ptep |= PT_DIRTY_MASK;
pte_gpa = ((gpa_t)table_gfn << PAGE_SHIFT);
pte_gpa += offset_in_page(ptep);
kvm_mmu_pte_write(vcpu, pte_gpa, (u8 *)ptep, sizeof(*ptep));
} }
} }