提交 f78978aa 编写于 作者: X Xiao Guangrong 提交者: Avi Kivity

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: NXiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>
上级 e02aa901
......@@ -461,6 +461,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
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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