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Peter Anvin" Subject: RE: [PATCH 1/2] x86/hyperv: Allow guests to enable InvariantTSC Thread-Topic: [PATCH 1/2] x86/hyperv: Allow guests to enable InvariantTSC Thread-Index: AQHVegKONOQa53Lxu0KKenjrGuzu3adJjEvw Date: Thu, 3 Oct 2019 23:15:39 +0000 Message-ID: References: <20191003155200.22022-1-parri.andrea@gmail.com> In-Reply-To: <20191003155200.22022-1-parri.andrea@gmail.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=2019-10-03T23:15:37.9996390Z; 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_ActionId=7e10b395-64ac-4c3b-8ac8-cb0ae0776f17; MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Extended_MSFT_Method=Automatic authentication-results: spf=none (sender IP is ) smtp.mailfrom=mikelley@microsoft.com; x-originating-ip: [24.22.167.197] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: fee20eef-17e5-4624-46ad-08d748579b44 x-ms-office365-filtering-ht: Tenant x-ms-traffictypediagnostic: CY4PR21MB0696:|CY4PR21MB0696: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:4125; x-forefront-prvs: 01792087B6 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(4636009)(396003)(136003)(366004)(39860400002)(346002)(376002)(189003)(199004)(22452003)(4326008)(2201001)(186003)(71190400001)(2906002)(9686003)(7696005)(7736002)(76116006)(8936002)(229853002)(8990500004)(55016002)(86362001)(81166006)(8676002)(81156014)(66066001)(6246003)(6116002)(33656002)(26005)(99286004)(71200400001)(446003)(66946007)(66476007)(64756008)(6436002)(66446008)(476003)(11346002)(66556008)(486006)(256004)(14444005)(54906003)(10290500003)(74316002)(52536014)(6506007)(478600001)(4744005)(10090500001)(5660300002)(102836004)(14454004)(305945005)(110136005)(76176011)(2501003)(316002)(25786009)(3846002);DIR:OUT;SFP:1102;SCL:1;SRVR:CY4PR21MB0696;H:CY4PR21MB0136.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-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: E3ujCQ4ExFR2BHdi4Ercn2ZhrRkEuyAd8cgZxDPjHRac7avLMP8pk7MBYjrBRLo14o3iR0tnaSvGHLJW0aMyLIVmDGTjo/FqNm4YGkG+Yaf+UVQOHkqweRnkt2JctxTXGzcilGM3Bnpd+K5denPhep+hzS0oBjxwChrhk+Rv4GaoJsYcKJeXhvTqmNHueat8V8zC0L17mJFa0UY9U0ECsRCYq78t6y1ujWVzXtEGwqrAtnwACRMKdRzdlTbyXY7YZlkrIWqIgk+SXowi/Gscre+9U4DR9/LdRzHqXI4zoHkx8QVi++xEW4/y5O6U/aJL+pLtXlcg50G9JWZ7JpajwMe+tc4mLenAj8rFzMI0org1fNbcPzkq5YV+DcU0Uaqr49WTYRN8kbhEu9u8lWubDpVLk6sQ7uYFxQNJI3EzXZo= 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: fee20eef-17e5-4624-46ad-08d748579b44 X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Oct 2019 23:15:39.7673 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: oWdB1+qf6ZeYCwINBOsqjUvBA2Z31TOpk4V36VxBmfXZx09t1h8QSXfQz6Ne2gw8B8TTgzPxeiK2PHWzo+Quckq4Da8x0Dp5QvypYHvxcG8= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR21MB0696 Sender: linux-hyperv-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org From: Andrea Parri Sent: Thursday, October 3, 2019= 8:52 AM >=20 > If the hardware supports TSC scaling, Hyper-V will set bit 15 of the > HV_PARTITION_PRIVILEGE_MASK in guest VMs with a compatible Hyper-V > configuration version. Bit 15 corresponds to the > AccessTscInvariantControls privilege. If this privilege bit is set, > guests can access the HvSyntheticInvariantTscControl MSR: guests can > set bit 0 of this synthetic MSR to enable the InvariantTSC feature. > After setting the synthetic MSR, CPUID will enumerate support for > InvariantTSC. >=20 > Signed-off-by: Andrea Parri > --- > arch/x86/include/asm/hyperv-tlfs.h | 5 +++++ > arch/x86/kernel/cpu/mshyperv.c | 7 ++++++- > 2 files changed, 11 insertions(+), 1 deletion(-) >=20 As noted in a separate email, this patch is standalone, not 1 of 2 as indicated in the subject line. Modulo that, Reviewed-by: Michael Kelley