KVM: MMU: fix infinite fault access retry

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

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 2a3c8909b14417548b19cfedcdb823c55deaf3c7..54fc61e4b0615dc7b46aec923a3c79231eaf9fd8 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2380,15 +2380,10 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
        if (pte_access & ACC_WRITE_MASK) {
 
                /*
-                * There are two cases:
-                * - the one is other vcpu creates new sp in the window
-                *   between mapping_level() and acquiring mmu-lock.
-                * - the another case is the new sp is created by itself
-                *   (page-fault path) when guest uses the target gfn as
-                *   its page table.
-                * Both of these cases can be fixed by allowing guest to
-                * retry the access, it will refault, then we can establish
-                * the mapping by using small page.
+                * Other vcpu creates new sp in the window between
+                * mapping_level() and acquiring mmu-lock. We can
+                * allow guest to retry the access, the mapping can
+                * be fixed if guest refault.
                 */
                if (level > PT_PAGE_TABLE_LEVEL &&
                    has_wrprotected_page(vcpu->kvm, gfn, level))