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authorXiao Guangrong <xiaoguangrong@cn.fujitsu.com>2010-05-15 18:53:35 +0800
committerAvi Kivity <avi@redhat.com>2010-08-01 10:35:50 +0300
commitf78978aa3a8222f7822f15fba5dbaea990ef0887 (patch)
treeb961f86576c2bfd58d546c44efa193bc9db449c6 /arch/x86
parente02aa901b1aa41fb541521800cc2a4774c162485 (diff)
downloadop-kernel-dev-f78978aa3a8222f7822f15fba5dbaea990ef0887.zip
op-kernel-dev-f78978aa3a8222f7822f15fba5dbaea990ef0887.tar.gz
KVM: MMU: only update unsync page in invlpg path
Only unsync pages need updated at invlpg time since other shadow pages are write-protected Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kvm/paging_tmpl.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 22f1379..0671d7a 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -461,6 +461,7 @@ 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;
@@ -472,10 +473,13 @@ 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;
@@ -493,7 +497,7 @@ 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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