kvm mmu: don't check PT_WRITABLE_MASK directly

Commit Message

Gui Jianfeng May 27, 2010, 8:09 a.m. UTC

None

Patch

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index ce4bbd3..441a5d8 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2923,7 +2923,7 @@  void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot)
 		pt = sp->spt;
 		for (i = 0; i < PT64_ENT_PER_PAGE; ++i)
 			/* avoid RMW */
-			if (pt[i] & PT_WRITABLE_MASK)
+			if (is_writable_pte(pt[i]))
 				pt[i] &= ~PT_WRITABLE_MASK;
 	}
 	kvm_flush_remote_tlbs(kvm);
@@ -3358,7 +3358,7 @@  void inspect_spte_has_rmap(struct kvm *kvm, u64 *sptep)
 	struct kvm_mmu_page *rev_sp;
 	gfn_t gfn;
 
-	if (*sptep & PT_WRITABLE_MASK) {
+	if (is_writable_pte(*sptep)) {
 		rev_sp = page_header(__pa(sptep));
 		gfn = rev_sp->gfns[sptep - rev_sp->spt];
 
@@ -3408,7 +3408,7 @@  static void check_writable_mappings_rmap(struct kvm_vcpu *vcpu)
 
 			if (!(ent & PT_PRESENT_MASK))
 				continue;
-			if (!(ent & PT_WRITABLE_MASK))
+			if (!is_writable_pte(ent))
 				continue;
 			inspect_spte_has_rmap(vcpu->kvm, &pt[i]);
 		}
@@ -3442,7 +3442,7 @@  static void audit_write_protection(struct kvm_vcpu *vcpu)
 
 		spte = rmap_next(vcpu->kvm, rmapp, NULL);
 		while (spte) {
-			if (*spte & PT_WRITABLE_MASK)
+			if (is_writable_pte(*spte))
 				printk(KERN_ERR "%s: (%s) shadow page has "
 				"writable mappings: gfn %lx role %x\n",
 			       __func__, audit_msg, sp->gfn,