[10/10] KVM MMU: optimize sync/update unsync-page

Commit Message

Xiao Guangrong April 22, 2010, 6:14 a.m. UTC

None

Patch

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index f092e71..5bdcc17 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2299,10 +2299,11 @@  static void paging_invlpg(struct kvm_vcpu *vcpu, gva_t gva)
 	for_each_shadow_entry(vcpu, gva, iterator) {
 		level = iterator.level;
 		sptep = iterator.sptep;
+		sp = page_header(__pa(sptep));
 
 		if (is_last_spte(*sptep, level)) {
-
-			sp = page_header(__pa(sptep));
+			if (!sp->unsync)
+				break;
 
 			if (!sp->role.cr4_pae)
 				offset = sp->role.quadrant << PT64_LEVEL_BITS;;
@@ -2320,7 +2321,7 @@  static void paging_invlpg(struct kvm_vcpu *vcpu, gva_t gva)
 			break;
 		}
 
-		if (!is_shadow_present_pte(*sptep))
+		if (!is_shadow_present_pte(*sptep) || !sp->unsync_children)
 			break;
 	}
 
@@ -2744,7 +2745,8 @@  void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 
 restart:
 	hlist_for_each_entry_safe(sp, node, n, bucket, hash_link) {
-		if (sp->gfn != gfn || sp->role.direct || sp->role.invalid)
+		if (sp->gfn != gfn || sp->role.direct || sp->role.invalid ||
+			sp->unsync)
 			continue;
 		pte_size = sp->role.cr4_pae ? 8 : 4;
 		misaligned = (offset ^ (offset + bytes - 1)) & ~(pte_size - 1);