[PATCH] KVM: MMU: Let the walker extract the target page gfn from the pte
This fixes a problem where set_pte_common() looked for shadowed pages based on
the page directory gfn (a huge page) instead of the actual gfn being mapped.
Signed-off-by: Avi Kivity <avi@qumranet.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index ba813f4..ceae25b 100644
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -752,7 +752,8 @@
u64 *shadow_pte,
gpa_t gaddr,
int dirty,
- u64 access_bits)
+ u64 access_bits,
+ gfn_t gfn)
{
hpa_t paddr;
@@ -779,10 +780,10 @@
if (access_bits & PT_WRITABLE_MASK) {
struct kvm_mmu_page *shadow;
- shadow = kvm_mmu_lookup_page(vcpu, gaddr >> PAGE_SHIFT);
+ shadow = kvm_mmu_lookup_page(vcpu, gfn);
if (shadow) {
pgprintk("%s: found shadow page for %lx, marking ro\n",
- __FUNCTION__, (gfn_t)(gaddr >> PAGE_SHIFT));
+ __FUNCTION__, gfn);
access_bits &= ~PT_WRITABLE_MASK;
*shadow_pte &= ~PT_WRITABLE_MASK;
}