Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
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>,
        "tglx@linutronix.de" <tglx@linutronix.de>,
        "mingo@redhat.com" <mingo@redhat.com>,
        "hpa@zytor.com" <hpa@zytor.com>, "x86@kernel.org" <x86@kernel.org>,
        "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 V3 12/13] KVM/VMX: Change hv flush logic when ept tables are
 mismatched.
Thread-Topic: [PATCH V3 12/13] KVM/VMX: Change hv flush logic when ept tables
 are mismatched.
Thread-Index: AQHUVhUqMmeUDbYBlEutoL/p1B3ROQ==
Date:   Thu, 27 Sep 2018 03:50:00 +0000
Message-ID: <20180927034829.2230-13-Tianyu.Lan@microsoft.com>
References: <20180927034829.2230-1-Tianyu.Lan@microsoft.com>
In-Reply-To: <20180927034829.2230-1-Tianyu.Lan@microsoft.com>
Accept-Language: en-US
Content-Language: en-US
received-spf: None (protection.outlook.com: microsoft.com does not designate
 permitted sender hosts)
spamdiagnosticoutput: 1:99
spamdiagnosticmetadata: NSPM
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-MS-Exchange-CrossTenant-Network-Message-Id: 504c4654-0797-4d7c-f005-08d6242c4d49
X-MS-Exchange-CrossTenant-originalarrivaltime: 27 Sep 2018 03:50:00.9423
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47
X-MS-Exchange-Transport-CrossTenantHeadersStamped: HK0P153MB0177
To:     unlisted-recipients:; (no To-header on input)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

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