[PATCH v4 07/11] KVM: VMX: Don't invalidate hv_tlb_eptp if the new EPTP matches

[Sean Christopherson]

From: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>

Don't invalidate the common EPTP, and thus trigger rechecking of EPTPs
across all vCPUs, if the new EPTP matches the old/common EPTP.  In all
likelihood this is a meaningless optimization, but there are (uncommon)
scenarios where KVM can reload the same EPTP.

Reviewed-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
 arch/x86/kvm/vmx/vmx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 2582df5ae64d..cd0d787b0a85 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -3117,7 +3117,8 @@ static void vmx_load_mmu_pgd(struct kvm_vcpu *vcpu, hpa_t root_hpa,
 		if (kvm_x86_ops.tlb_remote_flush) {
 			spin_lock(&to_kvm_vmx(kvm)->ept_pointer_lock);
 			to_vmx(vcpu)->ept_pointer = eptp;
-			to_kvm_vmx(kvm)->hv_tlb_eptp = INVALID_PAGE;
+			if (eptp != to_kvm_vmx(kvm)->hv_tlb_eptp)
+				to_kvm_vmx(kvm)->hv_tlb_eptp = INVALID_PAGE;
 			spin_unlock(&to_kvm_vmx(kvm)->ept_pointer_lock);
 		}
 
-- 
2.30.1.766.gb4fecdf3b7-goog