[PATCH v2 09/16] KVM: MMU: fast mmu_need_write_protect path for hardmmu

[Xiao Guangrong]

On direct mmu without nested, all the page is not write-protected by
shadow page table protection

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 53e92de..0c6e92d 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2293,6 +2293,9 @@ 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/