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Thread-Topic: [PATCH 2/4] KVM: Add tlb remote flush callback in kvm_x86_ops. Thread-Index: AQHUEg9m5H/WiURYK0O2BmjxbRNbxA== Date: Mon, 2 Jul 2018 14:17:24 +0000 Message-ID: <20180702141653.88936-3-Tianyu.Lan@microsoft.com> References: <20180702141653.88936-1-Tianyu.Lan@microsoft.com> In-Reply-To: <20180702141653.88936-1-Tianyu.Lan@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Tianyu.Lan@microsoft.com; x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;KU1P153MB0133;7:et6FLCeEV2ZEOZp+QIRtqHPL4dMCXCQWVpODnnPlzLPUWu4Eve/S6jLTWE5bS6Txt5KD+UdylIcf8iBhWWEucMCJMkSeZsRzk2InFFH6tb4ZmantY3b3fzO6mNfDYzgven2wgEBb8JXo4rTxrzeggZYs4i4FFn7iXAg5A9iOuxvfVr0M0WVoPfCPOH8901x5MpBTmLvb7p5XjbpRyIUn0UYzlL1v4P0Ee7t3ZTz90mWYLYX3bslVsOx0/ztnkP9C x-ms-exchange-antispam-srfa-diagnostics: SOS; x-ms-office365-filtering-correlation-id: 0270ebf8-492f-435f-70d3-08d5e02688c9 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652040)(8989117)(5600053)(711020)(48565401081)(2017052603328)(7193020);SRVR:KU1P153MB0133; x-ms-traffictypediagnostic: KU1P153MB0133: x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(89211679590171); x-ms-exchange-senderadcheck: 1 x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(8211001083)(6040522)(2401047)(5005006)(8121501046)(3002001)(10201501046)(3231254)(944501410)(52105095)(93006095)(93001095)(6055026)(149027)(150027)(6041310)(20161123558120)(20161123562045)(20161123564045)(20161123560045)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(6072148)(201708071742011)(7699016);SRVR:KU1P153MB0133;BCL:0;PCL:0;RULEID:;SRVR:KU1P153MB0133; x-forefront-prvs: 07215D0470 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(396003)(366004)(136003)(39860400002)(346002)(376002)(199004)(189003)(1671002)(54906003)(476003)(446003)(486006)(59246006)(36756003)(26005)(102836004)(22452003)(11346002)(2616005)(316002)(97736004)(2900100001)(14454004)(6486002)(109986005)(86362001)(86612001)(68736007)(6512007)(4326008)(25786009)(6436002)(10090500001)(53936002)(66066001)(5660300001)(105586002)(106356001)(8936002)(2906002)(305945005)(7736002)(99286004)(256004)(14444005)(72206003)(6506007)(10290500003)(76176011)(3846002)(8676002)(1076002)(81166006)(81156014)(478600001)(5250100002)(6116002);DIR:OUT;SFP:1102;SCL:1;SRVR:KU1P153MB0133;H:KU1P153MB0150.APCP153.PROD.OUTLOOK.COM;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: XPl1ddUO5ONQliZNfbJCjo9FOeG6AJc2NV9tgsTQ77Laxl8/dxJPc9ARwrC2UU9B/wlkBPaImxsA2opeFA5fqtx4DvoQTCVXaZuH1FVtbSAgByGFa4VAg8spJGQ7euRD6tMwU9ppYdxvyIGWWLgjR5CDe4dnfh3gEcztZrRnbqQUql6sAR5/Fr38B4sP4bJp+Jrtcxihl439dlxA/b5yELpSw/YKTtoM01QZJ2ZPtXGNzCVWWYV6x3LY5ntK/S9zMirVkR4zKNtvamFb/lVZI/WGyhCODohvBb9nX5Dvq+ISu187AXBw+cPpLpF8BlEevD1GSQhTPQhAwHTAlbYLEItcw+N9bA9w0f9bQVzYa3E= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0270ebf8-492f-435f-70d3-08d5e02688c9 X-MS-Exchange-CrossTenant-originalarrivaltime: 02 Jul 2018 14:17:24.6231 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: KU1P153MB0133 To: unlisted-recipients:; (no To-header on input) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch is to provide a way for platforms to register tlb remote flush callback and this helps to optimize operation of tlb flush among vcpus for nested virtualization case. Signed-off-by: Lan Tianyu --- arch/x86/include/asm/kvm_host.h | 1 + virt/kvm/kvm_main.c | 12 +++++++++++- 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_hos= t.h index c13cd28d9d1b..94d7437d84cb 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -973,6 +973,7 @@ struct kvm_x86_ops { void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags); =20 void (*tlb_flush)(struct kvm_vcpu *vcpu, bool invalidate_gpa); + int (*tlb_remote_flush)(struct kvm *kvm); =20 void (*run)(struct kvm_vcpu *vcpu); int (*handle_exit)(struct kvm_vcpu *vcpu); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 8b47507faab5..580bed127dd0 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -256,11 +256,21 @@ bool kvm_make_all_cpus_request(struct kvm *kvm, unsig= ned int req) #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL void kvm_flush_remote_tlbs(struct kvm *kvm) { + long dirty_count; + + /* + * Call tlb_remote_flush first and go back old way when + * return failure. + */ + if (kvm_x86_ops->tlb_remote_flush && + !kvm_x86_ops->tlb_remote_flush(kvm)) + return; + /* * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in * kvm_make_all_cpus_request. */ - long dirty_count =3D smp_load_acquire(&kvm->tlbs_dirty); + dirty_count =3D smp_load_acquire(&kvm->tlbs_dirty); =20 /* * We want to publish modifications to the page tables before reading --=20 2.14.3