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alistair23-linux
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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>
hifive-unleashed-5.1
Xiao Guangrong 2010-05-15 18:53:35 +08:00 committed by Avi Kivity
parent e02aa901b1
commit f78978aa3a
1 changed files with 6 additions and 2 deletions
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8
arch/x86/kvm/paging_tmpl.h
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@ -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;
}