commit be71e061d15c0aad4f8c2606f76c57b8a19792fd
author Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Fri Jun 11 21:31:38 2010 +0800
committer Avi Kivity <avi@redhat.com> Sun Aug 01 10:46:42 2010 +0300
tree d103cf12b162d2e4f8855b9bad5f92e640987d76
parent f918b443527e98476c8cc45683152106b9e4bedc

KVM: MMU: don't mark pte notrap if it's just sync transient

If the sync-sp just sync transient, don't mark its pte notrap

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

arch/x86/include/asm/kvm_host.h

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index c2813d6..2ec2e27 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -241,7 +241,7 @@
 	void (*prefetch_page)(struct kvm_vcpu *vcpu,
 			      struct kvm_mmu_page *page);
 	int (*sync_page)(struct kvm_vcpu *vcpu,
-			 struct kvm_mmu_page *sp);
+			 struct kvm_mmu_page *sp, bool clear_unsync);
 	void (*invlpg)(struct kvm_vcpu *vcpu, gva_t gva);
 	hpa_t root_hpa;
 	int root_level;

arch/x86/kvm/mmu.c

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index ff33357..d1e09f3c 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1103,7 +1103,7 @@
 }
 
 static int nonpaging_sync_page(struct kvm_vcpu *vcpu,
-			       struct kvm_mmu_page *sp)
+			       struct kvm_mmu_page *sp, bool clear_unsync)
 {
 	return 1;
 }
@@ -1228,7 +1228,7 @@
 	if (clear_unsync)
 		kvm_unlink_unsync_page(vcpu->kvm, sp);
 
-	if (vcpu->arch.mmu.sync_page(vcpu, sp)) {
+	if (vcpu->arch.mmu.sync_page(vcpu, sp, clear_unsync)) {
 		kvm_mmu_prepare_zap_page(vcpu->kvm, sp, invalid_list);
 		return 1;
 	}
@@ -1237,7 +1237,6 @@
 	return 0;
 }
 
-static void mmu_convert_notrap(struct kvm_mmu_page *sp);
 static int kvm_sync_page_transient(struct kvm_vcpu *vcpu,
 				   struct kvm_mmu_page *sp)
 {
@@ -1245,9 +1244,7 @@
 	int ret;
 
 	ret = __kvm_sync_page(vcpu, sp, &invalid_list, false);
-	if (!ret)
-		mmu_convert_notrap(sp);
-	else
+	if (ret)
 		kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list);
 
 	return ret;
@@ -1273,7 +1270,7 @@
 
 		WARN_ON(s->role.level != PT_PAGE_TABLE_LEVEL);
 		if ((s->role.cr4_pae != !!is_pae(vcpu)) ||
-			(vcpu->arch.mmu.sync_page(vcpu, s))) {
+			(vcpu->arch.mmu.sync_page(vcpu, s, true))) {
 			kvm_mmu_prepare_zap_page(vcpu->kvm, s, &invalid_list);
 			continue;
 		}

arch/x86/kvm/paging_tmpl.h

diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index efba353..863920f 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -578,7 +578,8 @@
  *   can't change unless all sptes pointing to it are nuked first.
  * - Alias changes zap the entire shadow cache.
  */
-static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
+static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
+			    bool clear_unsync)
 {
 	int i, offset, nr_present;
 	bool reset_host_protection;
@@ -615,7 +616,7 @@
 			u64 nonpresent;
 
 			rmap_remove(vcpu->kvm, &sp->spt[i]);
-			if (is_present_gpte(gpte))
+			if (is_present_gpte(gpte) || !clear_unsync)
 				nonpresent = shadow_trap_nonpresent_pte;
 			else
 				nonpresent = shadow_notrap_nonpresent_pte;