Commit d0a2d456 authored by Sean Christopherson's avatar Sean Christopherson Committed by Paolo Bonzini
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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: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarSean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
Message-Id: <20210305183123.3978098-8-seanjc@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent cdbd4b40

arch/x86/kvm/vmx/vmx.c

+2 −1
Original line number Diff line number Diff line
@@ -3117,6 +3117,7 @@ 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;

			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);

		}