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Thu, 1 Nov 2018 17:30:47 +0000 Received: from MWHPR21MB0766.namprd21.prod.outlook.com ([fe80::1982:5e59:2489:88e6]) by MWHPR21MB0766.namprd21.prod.outlook.com ([fe80::1982:5e59:2489:88e6%14]) with mapi id 15.20.1294.009; Thu, 1 Nov 2018 17:30:47 +0000 From: Michael Kelley To: "virtualization@lists.linux-foundation.org" , "linux-kernel@vger.kernel.org" , "tglx@linutronix.de" , "daniel.lezcano@linaro.org" , "jgross@suse.com" , "akataria@vmware.com" , "olaf@aepfle.de" , "apw@canonical.com" , vkuznets , "jasowang@redhat.com" , "marcelo.cerri@canonical.com" , KY Srinivasan CC: Michael Kelley Subject: [PATCH 0/2] i8253: Fix PIT shutdown quirk on Hyper-V Thread-Topic: [PATCH 0/2] i8253: Fix PIT shutdown quirk on Hyper-V Thread-Index: AQHUcgifYe6LR7d4Q0+wCx1mDqTimw== Date: Thu, 1 Nov 2018 17:30:46 +0000 Message-ID: <1541093374-10496-1-git-send-email-mikelley@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: MWHPR14CA0026.namprd14.prod.outlook.com (2603:10b6:300:12b::12) To MWHPR21MB0766.namprd21.prod.outlook.com (2603:10b6:300:76::20) x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [131.107.159.136] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;MWHPR21MB0174;6:mA7RAm/9LorcZaHhslbVX3adiomdKFw7Okh86X7D3PKV3Nd9t2cH/YrtRoCrlVDFKnlwuLou7cjUi2LhfAGEt9AU2YrUS1mtRh504NINIYrNrV82tyeeGr87i6HIqG8imQ2GGSabEmfos33TiwSwtHmtjB2B09GbGK1ZwzyLe3EaSsfF3arLH5nvacXK0fWL/ceseAe/7bN+P8dFe83HQZ2y89urdd22fw4LMXCQtoVGFeXAsXGSVix7FZum119weDFI6IiAq8JHmIXUPCbeZoYZ18Twm4JE5iKkGpiBL9+bqiJdfBjtyYXvwyGK71beZn5TSqIqMLFPCUgBdQdAHeMUDHPa5dVQvjJkaMYgplB3e4c6npGMOWKcH5LmhweRKHjYps0h4ynODFlq5Y87zkb6gRLDUAxNhiE3fS7LyNPzbiheSo+48QbNR7BrCTr2eQ8qn8DzNCyYUi68oQ4UVw==;5:ZDr+9lLC3hSfFuoM2FGbFOB1aS4qlWWabsfjBI9OqWts6AYFzsm20P2ub9gMmEKG8obuo84WiX+ypbj8C8M9kxi+UMFsTgpmB7vWQCMJR/9rHHWUAVoo/royiYCJVHx3Ct351hH26kPK4Lcz4tLYFSJp7iTSzLe07z52wL70ibA=;7:SUn2tgYHBA0HrjGoaTHAqO7pWfssuVundeSBsC0q9DmMulrwEkCQFTjF9ocoLFbn443Gk1Ah8LA6Yk5FaPEdgNDlDwsLUlML6wOZMiAyhTgBrYyImLIkmxuGnl46NcLfM43BNYzv5za+2Jt4GFuBNw== x-ms-office365-filtering-correlation-id: 92125705-5458-4acd-f3dd-08d6401fc242 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0;PCL:0;RULEID:(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600074)(711020)(4618075)(2017052603328)(7193020);SRVR:MWHPR21MB0174; 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received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: WFj1wKo0/RRsxgiYyZJOAUQNZAApu+5nU4wVyLFqOMGyBWaS9DyT40rQHYCi1wZ60YPRQebu+vvKKZvPNyTJhfrf8YKVncENKyaV9rokRvJEzm9l8jYIeDgleMG+IYc8sYCRyei8srtQsx9l6KDItKvxdh3m8+Z6RknLIXnNsBmPbKoOsuwWlyh3inCek8W3bzCWaMhy4QTo5Gaz8IdH2EG5NDUY/u/TPOcRWc6dtPE0b7hgcnv/4mfk91t2NEBlzgYtazs0mfkIdeFk1hQ4J3AltaETDsQhEAtAZkiw/2v2RRtzTAx6Y/BAAPpUgy2nSKfV36+zb3wK5QstMd9sG31K1eV1jvYFzCeHwsb+FKw= 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: 92125705-5458-4acd-f3dd-08d6401fc242 X-MS-Exchange-CrossTenant-originalarrivaltime: 01 Nov 2018 17:30:46.9960 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR21MB0174 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org pit_shutdown() doesn't work on Hyper-V because of a quirk in the PIT emulation. This problem exists in all versions of Hyper-V and had not been noticed previously. When the counter register is set to zero, the emulated PIT continues to interrupt @18.2 HZ. So add a test for running on Hyper-V, and use that test to skip setting the counter register when running on Hyper-V. This patch replaces a previously proposed patch with a different approach. This new approach follows comments from Thomas Gleixner. Michael Kelley (2): include/linux/hypervisor.h: Add test for running on Hyper-V i8253: Fix PIT shutdown quirk on Hyper-V drivers/clocksource/i8253.c | 14 ++++++++++++-- include/linux/hypervisor.h | 11 +++++++++++ 2 files changed, 23 insertions(+), 2 deletions(-) --=20 1.8.3.1