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KVM: VMX: Do Hyper-V TLB flush iff vCPU's EPTP hasn't been flushed

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Combine the for-loops for Hyper-V TLB EPTP checking and flushing, and in
doing so skip flushes for vCPUs whose EPTP matches the target 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: <20210305183123.3978098-6-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson
2021-03-05 10:31:17 -08:00
committed by Paolo Bonzini
parent 288bee2809
commit 446f7f1155
1 changed files with 8 additions and 15 deletions
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23
arch/x86/kvm/vmx/vmx.c
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@@ -505,33 +505,26 @@ static int hv_remote_flush_tlb_with_range(struct kvm *kvm,
spin_lock(&kvm_vmx->ept_pointer_lock);
if (kvm_vmx->ept_pointers_match == EPT_POINTERS_CHECK) {
if (kvm_vmx->ept_pointers_match != EPT_POINTERS_MATCH) {
kvm_vmx->ept_pointers_match = EPT_POINTERS_MATCH;
kvm_vmx->hv_tlb_eptp = INVALID_PAGE;
kvm_for_each_vcpu(i, vcpu, kvm) {
tmp_eptp = to_vmx(vcpu)->ept_pointer;
if (!VALID_PAGE(tmp_eptp))
if (!VALID_PAGE(tmp_eptp) ||
tmp_eptp == kvm_vmx->hv_tlb_eptp)
continue;
if (!VALID_PAGE(kvm_vmx->hv_tlb_eptp)) {
if (!VALID_PAGE(kvm_vmx->hv_tlb_eptp))
kvm_vmx->hv_tlb_eptp = tmp_eptp;
} else if (kvm_vmx->hv_tlb_eptp != tmp_eptp) {
kvm_vmx->hv_tlb_eptp = INVALID_PAGE;
else
kvm_vmx->ept_pointers_match
= EPT_POINTERS_MISMATCH;
break;
}
}
}
if (kvm_vmx->ept_pointers_match != EPT_POINTERS_MATCH) {
kvm_for_each_vcpu(i, vcpu, kvm) {
/* If ept_pointer is invalid pointer, bypass flush request. */
if (VALID_PAGE(to_vmx(vcpu)->ept_pointer))
ret |= hv_remote_flush_eptp(to_vmx(vcpu)->ept_pointer,
range);
ret |= hv_remote_flush_eptp(tmp_eptp, range);
}
if (kvm_vmx->ept_pointers_match == EPT_POINTERS_MISMATCH)
kvm_vmx->hv_tlb_eptp = INVALID_PAGE;
} else if (VALID_PAGE(kvm_vmx->hv_tlb_eptp)) {
ret = hv_remote_flush_eptp(kvm_vmx->hv_tlb_eptp, range);
}