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Peter Anvin" , Tianyu Lan Subject: RE: [PATCH 3/4] x86/hyper-v: use cheaper HVCALL_SEND_IPI hypercall when possible Thread-Topic: [PATCH 3/4] x86/hyper-v: use cheaper HVCALL_SEND_IPI hypercall when possible Thread-Index: AQHUCktiyUHpc2y48EWFPLv7XM/A8qRxrYHw Date: Tue, 26 Jun 2018 00:03:48 +0000 Message-ID: References: <20180622170625.30688-1-vkuznets@redhat.com> <20180622170625.30688-4-vkuznets@redhat.com> In-Reply-To: <20180622170625.30688-4-vkuznets@redhat.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Enabled=True; MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_SiteId=72f988bf-86f1-41af-91ab-2d7cd011db47; MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Owner=mikelley@ntdev.microsoft.com; MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_SetDate=2018-06-26T00:03:46.7172195Z; MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Name=General; MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Application=Microsoft Azure Information Protection; MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Extended_MSFT_Method=Automatic; Sensitivity=General x-originating-ip: [24.22.167.197] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;SN6PR2101MB1069;7:HFjG9MhjxJCPZ07j03xEqEosypiGN6hEuIr/JJxWxKnNzJKGaLRUlnjXk79vuwTN82DOz+0X/bg+BXxkC+DXokfnckx6B87suLC1A5T//dLJ5BMf6hbDvmBBvW0rYd/aF+SOY8nGRmY4QOXOkguuv5n+F3RFA1N3qw4PoyGcbbPewLYtQqqLgciPIP67v3AbUQ1X8nfnvP9PZfLt0lKVLh3OFYgdBIWNZObbrXzqtnq8Y86dRQw86lhyp2NFhyB3 x-ms-exchange-antispam-srfa-diagnostics: SOS; x-ms-office365-filtering-correlation-id: 75008a4d-d6db-4cca-b6ba-08d5daf84acf x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(8989117)(4534165)(4627221)(201703031133081)(201702281549075)(8990107)(5600026)(711020)(48565401081)(2017052603328)(7193020);SRVR:SN6PR2101MB1069; x-ms-traffictypediagnostic: SN6PR2101MB1069: x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(89211679590171)(9452136761055); x-ms-exchange-senderadcheck: 1 x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(8211001083)(6040522)(2401047)(5005006)(8121501046)(10201501046)(93006095)(93001095)(3231254)(2018427008)(944501410)(52105095)(3002001)(6055026)(149027)(150027)(6041310)(20161123564045)(20161123562045)(20161123560045)(20161123558120)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(6072148)(201708071742011)(7699016);SRVR:SN6PR2101MB1069;BCL:0;PCL:0;RULEID:;SRVR:SN6PR2101MB1069; x-forefront-prvs: 071518EF63 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(136003)(376002)(346002)(366004)(396003)(39860400002)(199004)(189003)(13464003)(8936002)(25786009)(4326008)(107886003)(476003)(11346002)(2501003)(10090500001)(106356001)(5250100002)(14454004)(86612001)(72206003)(68736007)(229853002)(256004)(2900100001)(53936002)(8676002)(10290500003)(105586002)(3846002)(2906002)(6116002)(5660300001)(81156014)(81166006)(6346003)(110136005)(305945005)(7696005)(97736004)(54906003)(102836004)(99286004)(76176011)(74316002)(33656002)(446003)(66066001)(486006)(55016002)(478600001)(9686003)(86362001)(8990500004)(6506007)(186003)(22452003)(6436002)(316002)(53546011)(7736002)(26005)(6246003)(12043001);DIR:OUT;SFP:1102;SCL:1;SRVR:SN6PR2101MB1069;H:SN6PR2101MB1120.namprd21.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) authentication-results: spf=none (sender IP is ) smtp.mailfrom=Michael.H.Kelley@microsoft.com; x-microsoft-antispam-message-info: mtb49Yqqq3aWW6wxIV/J63pQHJ+Uo2UTAEF2JF3RgwVbY4LBwQ+duaEP3xT+A8UoUqp7NjQcqNJYWBo4YhvWGs5nhgE08786XYt3fYK+O/nMCWdy0nNJS6p3z5+2eGl3sHOQS7qOWfCcs6n0kq5PFZ/B1sw/Q87rGO6ri05851itFsj5nIorX8X22WGaW+AxSTKkXh2RlqbWXCBsz2822ilxr1U9pvBztaKQ2jyzeY6qUrkSJwZcQ5S07fbup/eCFeheKniWsw9vngq0GpHhh8DTJmLEM/haEKde0EOxF5LyLuUdLyv5SElMgnC4tbJ7CAzj2ObJXNErCtXI2ATRQWBv1PTU6RBRDMcQzEnTF/E= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 75008a4d-d6db-4cca-b6ba-08d5daf84acf X-MS-Exchange-CrossTenant-originalarrivaltime: 26 Jun 2018 00:03:48.3258 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR2101MB1069 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > -----Original Message----- > From: Vitaly Kuznetsov > Sent: Friday, June 22, 2018 10:06 AM > To: x86@kernel.org > Cc: devel@linuxdriverproject.org; linux-kernel@vger.kernel.org; KY Sriniv= asan > ; Haiyang Zhang ; Stephen Hemm= inger > ; Thomas Gleixner ; Ingo Moln= ar > ; H. Peter Anvin ; Tianyu Lan > ; Michael Kelley (EOSG) > Subject: [PATCH 3/4] x86/hyper-v: use cheaper HVCALL_SEND_IPI hypercall w= hen possible >=20 > When there is no need to send an IPI to a CPU with VP number > 64 > we can do the job with fast HVCALL_SEND_IPI hypercall. >=20 > Signed-off-by: Vitaly Kuznetsov Reviewed-by: Michael Kelley