[COMMIT master] KVM: MMU: only update unsync page in invlpg path

[Avi Kivity]

From: Xiao Guangrong <xiaoguangr...@cn.fujitsu.com>

Only unsync pages need updated at invlpg time since other shadow
pages are write-protected

Signed-off-by: Xiao Guangrong <xiaoguangr...@cn.fujitsu.com>
Signed-off-by: Avi Kivity <a...@redhat.com>

diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 71c73fe..dfbc8c7 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -463,6 +463,7 @@ out_unlock:
 static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva)
 {
        struct kvm_shadow_walk_iterator iterator;
+       struct kvm_mmu_page *sp;
        gpa_t pte_gpa = -1;
        int level;
        u64 *sptep;
@@ -474,10 +475,13 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t 
gva)
                level = iterator.level;
                sptep = iterator.sptep;
 
+               sp = page_header(__pa(sptep));
                if (is_last_spte(*sptep, level)) {
-                       struct kvm_mmu_page *sp = page_header(__pa(sptep));
                        int offset, shift;
 
+                       if (!sp->unsync)
+                               break;
+
                        shift = PAGE_SHIFT -
                                  (PT_LEVEL_BITS - PT64_LEVEL_BITS) * level;
                        offset = sp->role.quadrant << shift;
@@ -495,7 +499,7 @@ static void FNAME(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;
        }
 
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