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[PATCH] KVM: MMU: Let the walker extract the target page gfn from the pte

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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>
This commit is contained in:
Avi Kivity
2007-01-05 16:36:44 -08:00
committed by Linus Torvalds
parent 374cbac033
commit 815af8d42e
2 changed files with 31 additions and 17 deletions
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7
drivers/kvm/mmu.c
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@@ -752,7 +752,8 @@ static inline void set_pte_common(struct kvm_vcpu *vcpu,
u64 *shadow_pte,
gpa_t gaddr,
int dirty,
u64 access_bits)
u64 access_bits,
gfn_t gfn)
{
hpa_t paddr;
@@ -779,10 +780,10 @@ static inline void set_pte_common(struct kvm_vcpu *vcpu,
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;
}