KVM: MMU: do not record gfn in kvm_mmu_pte_write

[deliverable/linux.git] / arch / x86 / kvm / mmu.c

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index d5455b1b725fbe144d3097d93e803e20def984c3..91a194667432f34d76075cff241698c12563bd7b 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3228,7 +3228,6 @@ static void mmu_guess_page_from_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
                kvm_release_pfn_clean(pfn);
                return;
        }
-       vcpu->arch.update_pte.gfn = gfn;
        vcpu->arch.update_pte.pfn = pfn;
 }
 
@@ -3275,9 +3274,8 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 
        /*
         * Assume that the pte write on a page table of the same type
-        * as the current vcpu paging mode.  This is nearly always true
-        * (might be false while changing modes).  Note it is verified later
-        * by update_pte().
+        * as the current vcpu paging mode since we update the sptes only
+        * when they have the same mode.
         */
        if ((is_pae(vcpu) && bytes == 4) || !new) {
                /* Handle a 32-bit guest writing two halves of a 64-bit gpte */