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Subject[PATCH 3/5] KVM MMU: fix for got gfn when sync shadow pages
sp->gfns[] are not mapping gfn since it has cooked by unalias_gfn()

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
---
arch/x86/kvm/paging_tmpl.h | 7 ++++---
1 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 11d8a16..71c73fe 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -588,7 +588,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
unsigned pte_access;
pt_element_t gpte;
gpa_t pte_gpa;
- gfn_t gfn = sp->gfns[i];
+ gfn_t gfn;

if (!is_shadow_present_pte(sp->spt[i]))
continue;
@@ -599,8 +599,9 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
sizeof(pt_element_t)))
return -EINVAL;

- if (gpte_to_gfn(gpte) != gfn || !is_present_gpte(gpte) ||
- !(gpte & PT_ACCESSED_MASK)) {
+ gfn = gpte_to_gfn(gpte);
+ if (unalias_gfn(vcpu->kvm, gfn) != sp->gfns[i] ||
+ !is_present_gpte(gpte) || !(gpte & PT_ACCESSED_MASK)) {
u64 nonpresent;

rmap_remove(vcpu->kvm, &sp->spt[i]);
--
1.6.1.2



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