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Fri, 21 Sep 2018 16:52:52 +0000 Received: from CY4PR21MB0773.namprd21.prod.outlook.com ([fe80::d1f6:46cd:d8b4:880c]) by CY4PR21MB0773.namprd21.prod.outlook.com ([fe80::d1f6:46cd:d8b4:880c%5]) with mapi id 15.20.1185.010; Fri, 21 Sep 2018 16:52:52 +0000 From: "Michael Kelley (EOSG)" To: Yi Sun , "linux-kernel@vger.kernel.org" CC: "x86@kernel.org" , "tglx@linutronix.de" , "chao.p.peng@intel.com" , "chao.gao@intel.com" , "isaku.yamahata@intel.com" , Tianyu Lan , KY Srinivasan , Haiyang Zhang , Stephen Hemminger Subject: RE: [PATCH v2 1/2] X86/Hyper-V: Add Guest IDLE MSR support Thread-Topic: [PATCH v2 1/2] X86/Hyper-V: Add Guest IDLE MSR support Thread-Index: AQHUUX+peHjbdhKEmkSbur3LtThgRqT685YQ Date: Fri, 21 Sep 2018 16:52:52 +0000 Message-ID: References: <1537514712-62434-1-git-send-email-yi.y.sun@linux.intel.com> <1537514712-62434-2-git-send-email-yi.y.sun@linux.intel.com> In-Reply-To: <1537514712-62434-2-git-send-email-yi.y.sun@linux.intel.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; 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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: GafmBXtF1bYPRL3FCPi1JMKiU9mOEqZw/FoBStqAJnOwmhyc8VidjFaJDaaiGcejW88pUyC58Nxnm1wWKPiyppaqXg3+z7aOloK6O37uhaCC44KVD7RMt9A3o0O3vJQC8BzgE1Eydt6i/hAaUMjOAZ66/WP5rm/OiMiFSIqVcvE1AAy9cJ8z1gabOy6lrnVs0SVLcVo3bVlFFXNAuyFL1xiFsx1fz0zN3ajjCyj1EWf31dDpvXKdF3rjGJfX872jvQ4aOaJddZgBv9iTou8fgZpEpaW4OZA7oWx7zCBGT4I5BNQxL4A4zPXye4i5iXaDxwuntQl5yV3sS0MP6euEslNBWsD9+U70zlhq9yKATyU= 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: bfb246bf-c53c-4808-2793-08d61fe2abc5 X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Sep 2018 16:52:52.3687 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR21MB0775 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Yi Sun Sent: Friday, September 21, 2018 1= 2:25 AM >=20 > Hyper-V may expose a HV_X64_MSR_GUEST_IDLE MSR. We can read > HYPERV_CPUID_FEATURES eax to check it. Read this MSR can > trigger the guest's transition to the idle power state which > can be exited by an IPI even if IF flag is disabled. >=20 > Cc: "K. Y. Srinivasan" > Cc: Haiyang Zhang > Cc: Stephen Hemminger > Signed-off-by: Yi Sun > --- > arch/x86/include/asm/hyperv-tlfs.h | 5 +++++ > 1 file changed, 5 insertions(+) >=20 Reviewed-by: Michael Kelley