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KVM: MMU: Fix is_dirty_pte()

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is_dirty_pte() is used on guest ptes, not shadow ptes, so it needs to avoid
shadow_dirty_mask and use PT_DIRTY_MASK instead.

Misdetecting dirty pages could lead to unnecessarily setting the dirty bit
under EPT.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2009-06-10 12:56:54 +03:00
parent 7ffd92c53c
commit 439e218a6f
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/mmu.c
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@ -242,7 +242,7 @@ static int is_writeble_pte(unsigned long pte)
static int is_dirty_pte(unsigned long pte)
{
return pte & shadow_dirty_mask;
return pte & PT_DIRTY_MASK;
}
static int is_rmap_pte(u64 pte)