KVM: MMU: check rmap for every spte

The read-only spte also has reverse mapping, so fix the code to check them,
also modify the function name to fit its doing
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/mmu.c

@@ -3644,7 +3644,7 @@ void inspect_spte_has_rmap(struct kvm *kvm, u64 *sptep)
 	struct kvm_mmu_page *rev_sp;
 	gfn_t gfn;
 
-	if (is_writable_pte(*sptep)) {
+
 	rev_sp = page_header(__pa(sptep));
 	gfn = kvm_mmu_page_get_gfn(rev_sp, sptep - rev_sp->spt);
 
@@ -3668,16 +3668,14 @@ void inspect_spte_has_rmap(struct kvm *kvm, u64 *sptep)
 				 audit_msg, *sptep);
 		dump_stack();
 	}
-	}
-
 }
 
-void audit_writable_sptes_have_rmaps(struct kvm_vcpu *vcpu)
+void audit_sptes_have_rmaps(struct kvm_vcpu *vcpu)
 {
 	mmu_spte_walk(vcpu, inspect_spte_has_rmap);
 }
 
-static void check_writable_mappings_rmap(struct kvm_vcpu *vcpu)
+static void check_mappings_rmap(struct kvm_vcpu *vcpu)
 {
 	struct kvm_mmu_page *sp;
 	int i;
@@ -3689,12 +3687,9 @@ static void check_writable_mappings_rmap(struct kvm_vcpu *vcpu)
 			continue;
 
 		for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
-			u64 ent = pt[i];
-
-			if (!(ent & PT_PRESENT_MASK))
-				continue;
-			if (!is_writable_pte(ent))
+			if (!is_rmap_spte(pt[i]))
 				continue;
+
 			inspect_spte_has_rmap(vcpu->kvm, &pt[i]);
 		}
 	}
@@ -3703,7 +3698,7 @@ static void check_writable_mappings_rmap(struct kvm_vcpu *vcpu)
 
 static void audit_rmap(struct kvm_vcpu *vcpu)
 {
-	check_writable_mappings_rmap(vcpu);
+	check_mappings_rmap(vcpu);
 	count_rmaps(vcpu);
 }
 
@@ -3746,7 +3741,7 @@ static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg)
 	audit_write_protection(vcpu);
 	if (strcmp("pre pte write", audit_msg) != 0)
 		audit_mappings(vcpu);
-	audit_writable_sptes_have_rmaps(vcpu);
+	audit_sptes_have_rmaps(vcpu);
 	dbg = olddbg;
 }