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KVM: VMX: Don't invalidate hv_tlb_eptp if the new EPTP matches

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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@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210305183123.3978098-8-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2021-03-05 10:31:19 -08:00 committed by Paolo Bonzini
parent cdbd4b40e7
commit d0a2d45654
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kvm/vmx/vmx.c
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@ -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);
}