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KVM: MMU: Fix dirty page setting for pages removed from rmap

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Right now rmap_remove won't set the page as dirty if the shadow pte
pointed to this page had write access and then it became readonly.
This patches fixes that, by setting the page as dirty for spte changes from
write to readonly access.

Signed-off-by: Izik Eidus <izike@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Izik Eidus 2008-01-12 23:49:09 +02:00 committed by Avi Kivity
parent 6f723c7911
commit 75e68e6078
1 changed files with 6 additions and 2 deletions
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8
arch/x86/kvm/mmu.c
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@ -890,6 +890,7 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte,
{
u64 spte;
int was_rmapped = is_rmap_pte(*shadow_pte);
int was_writeble = is_writeble_pte(*shadow_pte);
pgprintk("%s: spte %llx access %x write_fault %d"
" user_fault %d gfn %lx\n",
@ -956,9 +957,12 @@ unshadowed:
rmap_add(vcpu, shadow_pte, gfn);
if (!is_rmap_pte(*shadow_pte))
kvm_release_page_clean(page);
} else {
if (was_writeble)
kvm_release_page_dirty(page);
else
kvm_release_page_clean(page);
}
else
kvm_release_page_clean(page);
if (!ptwrite || !*ptwrite)
vcpu->arch.last_pte_updated = shadow_pte;
}