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Sun, 4 Nov 2018 03:48:57 +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 15.20.1339.000; Sun, 4 Nov 2018 03:48:57 +0000 From: Michael Kelley To: "gregkh@linuxfoundation.org" , "devel@linuxdriverproject.org" , "linux-kernel@vger.kernel.org" , "tglx@linutronix.de" , "daniel.lezcano@linaro.org" , "virtualization@lists.linux-foundation.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 v2 2/2] x86/hyper-v: Enable PIT shutdown quirk Thread-Topic: [PATCH v2 2/2] x86/hyper-v: Enable PIT shutdown quirk Thread-Index: AQHUc/FQOuS/oFijukqEX+uW8LbhTQ== Date: Sun, 4 Nov 2018 03:48:57 +0000 Message-ID: <1541303219-11142-3-git-send-email-mikelley@microsoft.com> References: <1541303219-11142-1-git-send-email-mikelley@microsoft.com> In-Reply-To: <1541303219-11142-1-git-send-email-mikelley@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: MWHPR21CA0041.namprd21.prod.outlook.com (2603:10b6:300:129::27) 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;MWHPR21MB0864;6:TuDWvas6P04759LDsi7YaIzoOqV1pBBhAMsFV3x/3g/0aYx4XTyH1xnoYVcnF2NymlLkeHMUp1fnMIGcpasyOXglAElO+zNEefohxcSmokWOHfnYdQ3eZk4mD1pkmVSRpW0fcsp9v7JoVCcAEr5GBQAedp/73b/vyz3jW2AF84F12Cxpw3udiX+aOOdQtaLod80qhAGLVMlHsB4XoBzCOCVtTFAsIWN0J+D7IQ0cqMSZX5Qbtxww1QR+g5XrbwkWHuo0HB7LBZK6M3q6xTzeBd/LZMXB/ghu/1IgXX+StJiVczjTm8XDXqKecMxsSDF+78C34unZOKBJjQJQmKMz2OrrTW5Qmq58bI+ozuH+74K3Ky+wE88aptbwrcj0csbkyMDLeXwyFyf0FO+ODRs0rCfVS6FWmV9EjYh9zYnIUcpGeg1HpEcJkBXMUcAaEV29R55WuMFi1E5cLAfCf/pE1w==;5:D53EdZ/fCKUao1bwYjekNih65g+jog9ieDstSamCWVivAMAxlV1rqEEW2iCXMHAtcr4vOSH4CqYCwQycwpQKxJDhdblBbmJl7j6oTuddoG/5HIGKEqIXtqjjyljXqrKPra95+iQMm+NCzQ8zDOKDfZbMgwSP7pv2TJyPQgHY/gg=;7:Ssd9keR0nwaNk4zKkvVqUBv5OFGu5oU0Q9li8cwY5gJrJs0E+/JEBN2JEEy1l0Ufz9DMTO1rQFsSHRWIFU8GVhlLa1yFXO9wjSRvxMmPXESD/nepq9Iv911W+DknSKVlulUV2GRbNVaigjz1fOUfBA== x-ms-office365-filtering-correlation-id: 8925366f-4dfb-4814-2506-08d6420872e7 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:MWHPR21MB0864; 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received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: Wuu1fzs6hJ38zcHb5rAWNOPmMx4cAY+6t3AoAn+PL/G9O1jEOT30B/9wMbQv/hNbaXRbLfuv9W5RrEgoI4yIosUyFEjFv4PHlD7A87k+Imc1yCLFU2tj0fRHVP8gn8hFmRW5CFy3FuJcJOkTrXwjbAjinlw2p5MJwRxUTrjVLv5BK+B/nacGgQwQvPUfdkFS0qDUHVgdfAWfRiPg2UuCSaMUrL7LwQDVSG4DZb/bqblVOApDmCcn8waLmZzA/w2x0BH+YqssjfzGvprq6Mk8guU6n/CXSA2OcNJpzXXwas2AcFlYyPbn0+Fgtt1oxqQ3m5yO1ZBMMPYXBZHSncCi3jFvdl08RA3TR70kVBqzK3U= 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: 8925366f-4dfb-4814-2506-08d6420872e7 X-MS-Exchange-CrossTenant-originalarrivaltime: 04 Nov 2018 03:48:57.5832 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR21MB0864 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hyper-V emulation of the PIT has a quirk such that the normal PIT shutdown path doesn't work. Enable the PIT code that handles this quirk. Signed-off-by: Michael Kelley --- arch/x86/kernel/cpu/mshyperv.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.= c index 1c72f38..65b2f88 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include #include @@ -295,6 +296,16 @@ static void __init ms_hyperv_init_platform(void) if (efi_enabled(EFI_BOOT)) x86_platform.get_nmi_reason =3D hv_get_nmi_reason; =20 + /* + * Hyper-V VMs have a PIT emulation quirk such that zeroing the + * counter register during PIT shutdown restarts the PIT. So it + * continues to interrupt @18.2 HZ. Setting i8253_clear_counter + * to false tells pit_shutdown() not to zero the counter so that + * the PIT really is shutdown. Generation 2 VMs don't have a PIT, + * and setting this value has no effect. + */ + i8253_clear_counter =3D false; + #if IS_ENABLED(CONFIG_HYPERV) /* * Setup the hook to get control post apic initialization. --=20 1.8.3.1