From d0a2d45654c7b117236d8b276a6b8b8bf071e342 Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Fri, 5 Mar 2021 10:31:19 -0800 Subject: [PATCH] KVM: VMX: Don't invalidate hv_tlb_eptp if the new EPTP matches 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 Signed-off-by: Sean Christopherson Signed-off-by: Sean Christopherson Message-Id: <20210305183123.3978098-8-seanjc@google.com> Signed-off-by: Paolo Bonzini --- 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 2dc7e28..fedc9be 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); } -- 2.7.4