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Peter Anvin" , Tianyu Lan Subject: RE: [PATCH 2/4] x86/hyper-v: use 'fast' hypercall for HVCALL_SEND_IPI Thread-Topic: [PATCH 2/4] x86/hyper-v: use 'fast' hypercall for HVCALL_SEND_IPI Thread-Index: AQHUCktgwcjn6tsgfU+Yh/WE3ggTO6RxqpVQ Date: Mon, 25 Jun 2018 23:54:25 +0000 Message-ID: References: <20180622170625.30688-1-vkuznets@redhat.com> <20180622170625.30688-3-vkuznets@redhat.com> In-Reply-To: <20180622170625.30688-3-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=2018-06-25T23:54:24.3619386Z; 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;SN6PR2101MB1053;7:/ikVf8FEda82AUIa9ZbYa3oND1Go2fiSRGEfXJBMNxWCilAlHlleUNblsk+v5RmNhqcVWmuYIKvPmfA8Vw8YuEnMq6P2hbAsA6Su58yRNTnuZopgHc99/17xMTNPe1b9zJVJWUvlQu+bYNbhY0tHbs6N52rUPu6/vOGJqpNPyhZAqaaSPveu6XZ9WpPLsFYLNG/zci3xUk1sRRnJeP+xthKQqTiKZ1Jz/+2lfu+2KbuN5tKpfQUceSYRrR4VURdv x-ms-exchange-antispam-srfa-diagnostics: SOS; x-ms-office365-filtering-correlation-id: 92abfe91-c00d-401b-7387-08d5daf6fb96 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:SN6PR2101MB1053; x-ms-traffictypediagnostic: SN6PR2101MB1053: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Michael.H.Kelley@microsoft.com; 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)(3002001)(93006095)(93001095)(10201501046)(3231254)(2018427008)(944501410)(52105095)(6055026)(149027)(150027)(6041310)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123560045)(20161123562045)(20161123558120)(20161123564045)(6072148)(201708071742011)(7699016);SRVR:SN6PR2101MB1053;BCL:0;PCL:0;RULEID:;SRVR:SN6PR2101MB1053; x-forefront-prvs: 0714841678 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(366004)(136003)(396003)(376002)(39860400002)(346002)(189003)(199004)(13464003)(74316002)(476003)(33656002)(11346002)(305945005)(446003)(4326008)(7736002)(478600001)(72206003)(10290500003)(14454004)(25786009)(97736004)(55016002)(86612001)(8936002)(86362001)(6116002)(3846002)(6436002)(76176011)(66066001)(7696005)(9686003)(26005)(186003)(53546011)(6506007)(68736007)(102836004)(8676002)(53936002)(81156014)(81166006)(229853002)(107886003)(6246003)(99286004)(2900100001)(316002)(22452003)(54906003)(5660300001)(110136005)(2501003)(8990500004)(5250100002)(105586002)(106356001)(256004)(486006)(2906002)(10090500001);DIR:OUT;SFP:1102;SCL:1;SRVR:SN6PR2101MB1053;H:SN6PR2101MB1120.namprd21.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A:1; received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: sAPpxa1kdOFCP8a6vF51yYBggDtne4x1DGQ/A1Fa7oqVrepcPbEefg3Jp2iWpUO5xcb4zWoe6yH1nAiE2YH31zXD3ME0CJNjnd3MoAJNPG6P6U/XIy86UnYdKh4N7S25dSrgNHYT9ovNgYumUiBr+d7sS7mx6ONk9hVV16+TWB6UtWAyoD0jrHIcYHjvvedUijakrXbeP2+G3JDa84JMM63QI8QLfODg7E5xvOPNG/8yf3iGjrdhvZOdZSb49U8izEiLs8i8Q8KJeaD4aa9qPLXLWEFcQPTFMEOVv+8WPPYYwkTyuRzja2iPPeL9qsrXlql4Y+910SfSTqcRcAUt1ELcb2g9TRZv3a7/BSd9u0o= 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: 92abfe91-c00d-401b-7387-08d5daf6fb96 X-MS-Exchange-CrossTenant-originalarrivaltime: 25 Jun 2018 23:54:25.9450 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR2101MB1053 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 2/4] x86/hyper-v: use 'fast' hypercall for HVCALL_SEND_IP= I >=20 > Current Hyper-V TLFS (v5.0b) claims that HvCallSendSyntheticClusterIpi > hypercall can't be 'fast' (passing parameters through registers) but > apparently this is not true, Windows always uses 'fast' version. We can > do the same in Linux too. >=20 > Signed-off-by: Vitaly Kuznetsov Reviewed-by: Michael Kelley