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

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,
gfn_t table_gfn)
{
gpa_t pte_gpa;
if (write_fault && !is_dirty_pte(*ptep)) {
mark_page_dirty(vcpu->kvm, table_gfn);
*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));
}
}