KVM/VMX: Change hv flush logic when ept tables are mismatched.

Lan Tianyu · bonzini · commit a5c214dad198 · 2018-10-17T00:30:09.000+02:00
If ept table pointers are mismatched, flushing tlb for each vcpus via
hv flush interface still helps to reduce vmexits which are triggered
by IPI and INEPT emulation.

Signed-off-by: Lan Tianyu &lt;Tianyu.Lan@microsoft.com&gt;
Signed-off-by: Paolo Bonzini &lt;pbonzini@redhat.com&gt;
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
@@ -1571,22 +1571,23 @@ static void check_ept_pointer_match(struct kvm *kvm)
 
 static int vmx_hv_remote_flush_tlb(struct kvm *kvm)
 {
-	int ret;
+	struct kvm_vcpu *vcpu;
+	int ret = -ENOTSUPP, i;
 
 	spin_lock(&to_kvm_vmx(kvm)->ept_pointer_lock);
 
 	if (to_kvm_vmx(kvm)->ept_pointers_match == EPT_POINTERS_CHECK)
 		check_ept_pointer_match(kvm);
 
 	if (to_kvm_vmx(kvm)->ept_pointers_match != EPT_POINTERS_MATCH) {
-		ret = -ENOTSUPP;
-		goto out;
+		kvm_for_each_vcpu(i, vcpu, kvm)
+			ret |= hyperv_flush_guest_mapping(
+				to_vmx(kvm_get_vcpu(kvm, i))->ept_pointer);
+	} else {
+		ret = hyperv_flush_guest_mapping(
+				to_vmx(kvm_get_vcpu(kvm, 0))->ept_pointer);
 	}
 
-	ret = hyperv_flush_guest_mapping(
-			to_vmx(kvm_get_vcpu(kvm, 0))->ept_pointer);
-
-out:
 	spin_unlock(&to_kvm_vmx(kvm)->ept_pointer_lock);
 	return ret;
 }
