Exactly, unysnc_children is the number of unsync sptes, we can use to
avoid unnecessary spte fetching
Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/mmu.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 9bd2084..16e0642 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1468,12 +1468,15 @@ static int __mmu_unsync_walk(struct kvm_mmu_page *sp,
struct kvm_mmu_pages *pvec)
{
u64 *spte;
- int i, ret, nr_unsync_leaf = 0;
+ int i, ret, nr_unsync_leaf = 0, unysnc_children = sp->unsync_children;
for_each_unsync_children(sp, spte, i) {
struct kvm_mmu_page *child;
u64 ent = *spte;
+ if (!unysnc_children--)
+ break;
+
WARN_ON(!is_shadow_present_pte(ent) || is_large_pte(ent));
child = page_header(ent & PT64_BASE_ADDR_MASK);
--
1.7.7.4
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