KVM: MMU: Fix is_empty_shadow_page() check

The check is only looking at one of two possible empty ptes.

Signed-off-by: Avi Kivity <avi@qumranet.com>

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index c2fd6a4a58c38815e97d1d15c66dbb4b51f30122..ee3f53098f0c738e59bc1eb3fefe890d3e528eeb 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -658,7 +658,7 @@ static int is_empty_shadow_page(u64 *spt)
        u64 *end;
 
        for (pos = spt, end = pos + PAGE_SIZE / sizeof(u64); pos != end; pos++)
-               if (*pos != shadow_trap_nonpresent_pte) {
+               if (is_shadow_present_pte(*pos)) {
                        printk(KERN_ERR "%s: %p %llx\n", __func__,
                               pos, *pos);
                        return 0;