If it have no indirect shadow pages we need not protect any gfn,
this is always true for direct mmu without nested
Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/mmu.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 28b12e2..a846a9c 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2294,6 +2294,9 @@ static int mmu_need_write_protect(struct kvm_vcpu *vcpu, gfn_t gfn,
struct hlist_node *node;
bool need_unsync = false;
+ if (!vcpu->kvm->arch.indirect_shadow_pages)
+ return 0;
+
for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn, node) {
if (!can_unsync)
return 1;
--
1.7.7.6
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