[PATCH 1/5] mmu: mark spte present if the x bit is set

Bandan Das
2016-06-28T04:33:57Z

This is safe because is_shadow_present_pte() is called
on host controlled page table and we know the spte is
valid

Signed-off-by: Bandan Das <bsd@redhat.com>
---
arch/x86/kvm/mmu.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index def97b3..a50af79 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -304,7 +304,8 @@ static int is_nx(struct kvm_vcpu *vcpu)

static int is_shadow_present_pte(u64 pte)
{
- return pte & PT_PRESENT_MASK && !is_mmio_spte(pte);
+ return pte & (PT_PRESENT_MASK | shadow_x_mask) &&
+ !is_mmio_spte(pte);
}

static int is_large_pte(u64 pte)
--
2.5.5