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From:   Tianyu Lan <Tianyu.Lan@microsoft.com>
CC:     Tianyu Lan <Tianyu.Lan@microsoft.com>,
        "pbonzini@redhat.com" <pbonzini@redhat.com>,
        "rkrcmar@redhat.com" <rkrcmar@redhat.com>,
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        "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com>,
        KY Srinivasan <kys@microsoft.com>,
        vkuznets <vkuznets@redhat.com>,
        Jork Loeser <Jork.Loeser@microsoft.com>
Subject: [PATCH V2 12/13] KVM/VMX: Change hv flush logic when ept tables are
 mismatched.
Thread-Topic: [PATCH V2 12/13] KVM/VMX: Change hv flush logic when ept tables
 are mismatched.
Thread-Index: AQHUTv5nZuQOhoZncE6SlYYnklW2+w==
Date:   Tue, 18 Sep 2018 03:19:27 +0000
Message-ID: <20180918031754.113013-13-Tianyu.Lan@microsoft.com>
References: <20180918031754.113013-1-Tianyu.Lan@microsoft.com>
In-Reply-To: <20180918031754.113013-1-Tianyu.Lan@microsoft.com>
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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 <Tianyu.Lan@microsoft.com>
---
 arch/x86/kvm/vmx.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 533a327372c8..2869c3e78168 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1557,7 +1557,8 @@ static void check_ept_pointer_match(struct kvm *kvm)
=20
 static int vmx_hv_remote_flush_tlb(struct kvm *kvm)
 {
-	int ret;
+	struct kvm_vcpu *vcpu;
+	int ret =3D -ENOTSUPP, i;
=20
 	spin_lock(&to_kvm_vmx(kvm)->ept_pointer_lock);
=20
@@ -1565,14 +1566,14 @@ static int vmx_hv_remote_flush_tlb(struct kvm *kvm)
 		check_ept_pointer_match(kvm);
=20
 	if (to_kvm_vmx(kvm)->ept_pointers_match !=3D EPT_POINTERS_MATCH) {
-		ret =3D -ENOTSUPP;
-		goto out;
+		kvm_for_each_vcpu(i, vcpu, kvm)
+			ret |=3D hyperv_flush_guest_mapping(
+				to_vmx(kvm_get_vcpu(kvm, i))->ept_pointer);
+	} else {
+		ret =3D hyperv_flush_guest_mapping(
+				to_vmx(kvm_get_vcpu(kvm, 0))->ept_pointer);
 	}
=20
-	ret =3D 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;
 }
--=20
2.14.4