From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 77EC1C2D0E6 for ; Wed, 25 Mar 2020 18:31:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 462C020774 for ; Wed, 25 Mar 2020 18:31:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=microsoft.com header.i=@microsoft.com header.b="PVvDpU8r" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727975AbgCYSbm (ORCPT ); Wed, 25 Mar 2020 14:31:42 -0400 Received: from mail-bn7nam10on2108.outbound.protection.outlook.com ([40.107.92.108]:20640 "EHLO NAM10-BN7-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727275AbgCYSbl (ORCPT ); Wed, 25 Mar 2020 14:31:41 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=HUCcC82ZMaUMY+vgiOt48e51mJznsDFInhfG+Uk3gzm3Iz5zHPUmUX2IMUv4MZjJgQ/bOP4FceDQs0qNe+7crFgVQa5y0eshbuXUBQux5d5392ldSk1jhQl1xZ1Ui0z22Cj4SnqNSC0RBR+GQyz+dXP8qjUvvaEhcw42wn+RK37s5RnrlGV955ZkmD1YvDRYOjHU5bQfYxZB4IsNCQQWvAEnXR10AaI4Ohf5fzVTHIbQWc2x7uemmreD9XHJGh54gZNpdaIsu9AjEVucVetkkWjiR+3cKNLBtMyR+zViH/HhQBcbGj1FJSYSTYjyGbRCDv/YmbDX7xbFAKbNWQln+Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=9WN7uYoplqTxf+W2u4qTk8j9ZiQ+VgbtNIq+3GAtH5c=; b=b134r/Q6PoSqhoA3kX882tXoTXB58iki/BDSdqazc6ppyVq799pMUnHelg9OH/eccqY7gZo9F3WV2i1SYQhboZrxiQv6PwuLfoBQNbprRfT8vsScOHEx+HpoYaR1w58brC+ztQj8Pdw43DBtGhs556rV0l9qCyxabJYbLMrB8TEBY1bfaTi75sxHmaqAcA3MAZLsIx+E8PdJ84w1gY4RLIjartvE9O9CwcukLgUVlvVCiU2H87XPGX2Wi2ujNyW27WlN9VOuEN1pm8Z+YlkhHqumm52nfaLOEgmO3iLuKg/cIQ0FMbNUXsjEv0bDKjeNUht0AFjRL4bbbZAoZ30oBw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=microsoft.com; dmarc=pass action=none header.from=microsoft.com; dkim=pass header.d=microsoft.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=9WN7uYoplqTxf+W2u4qTk8j9ZiQ+VgbtNIq+3GAtH5c=; b=PVvDpU8rYV81Oy1wAeivUhJ8kp6/TEyVdZfxlM15g+XPAmiXUGCK7sHM9zI53IxEGhJ8mdXA+FcgGw1Ig6g5c21iQdmAlsYWtL8F1G/HG5bp6owFTXfY15kBq2sxJ2bg40NbbCH2k+YvHnqSf9bImDOavqCrOw5SuMATMVuxt50= Received: from MW2PR2101MB1052.namprd21.prod.outlook.com (2603:10b6:302:a::16) by MW2PR2101MB0938.namprd21.prod.outlook.com (2603:10b6:302:4::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2878.2; Wed, 25 Mar 2020 18:31:34 +0000 Received: from MW2PR2101MB1052.namprd21.prod.outlook.com ([fe80::71ee:121:71bd:6156]) by MW2PR2101MB1052.namprd21.prod.outlook.com ([fe80::71ee:121:71bd:6156%8]) with mapi id 15.20.2878.007; Wed, 25 Mar 2020 18:31:34 +0000 From: Michael Kelley To: "ltykernel@gmail.com" , KY Srinivasan , Haiyang Zhang , Stephen Hemminger , Wei Liu , "tglx@linutronix.de" , "mingo@redhat.com" , "bp@alien8.de" , "hpa@zytor.com" , "x86@kernel.org" CC: Tianyu Lan , "linux-hyperv@vger.kernel.org" , "linux-kernel@vger.kernel.org" , vkuznets Subject: RE: [PATCH V3 3/6] x86/Hyper-V: Trigger crash enlightenment only once during system crash. Thread-Topic: [PATCH V3 3/6] x86/Hyper-V: Trigger crash enlightenment only once during system crash. Thread-Index: AQHWAbHkVQqv7848GEyMFXlIMavObahZo21A Date: Wed, 25 Mar 2020 18:31:34 +0000 Message-ID: References: <20200324075720.9462-1-Tianyu.Lan@microsoft.com> <20200324075720.9462-4-Tianyu.Lan@microsoft.com> In-Reply-To: <20200324075720.9462-4-Tianyu.Lan@microsoft.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=2020-03-25T18:31:32.3622987Z; 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=08811a53-9bd9-447b-8942-bc1586d2cc3c; 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-ht: Tenant x-ms-office365-filtering-correlation-id: 51e35313-bd2c-464e-4dbe-08d7d0eabf2b x-ms-traffictypediagnostic: MW2PR2101MB0938:|MW2PR2101MB0938:|MW2PR2101MB0938: x-ms-exchange-transport-forked: True x-ld-processed: 72f988bf-86f1-41af-91ab-2d7cd011db47,ExtAddr x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:121; x-forefront-prvs: 0353563E2B x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MW2PR2101MB1052.namprd21.prod.outlook.com;PTR:;CAT:NONE;SFTY:;SFS:(10019020)(4636009)(136003)(396003)(346002)(376002)(39860400002)(366004)(110136005)(66446008)(64756008)(6506007)(8676002)(66946007)(66556008)(66476007)(2906002)(54906003)(478600001)(33656002)(81156014)(81166006)(26005)(4744005)(8990500004)(10290500003)(186003)(55016002)(71200400001)(7696005)(76116006)(8936002)(5660300002)(86362001)(316002)(4326008)(52536014)(9686003)(921003)(1121003);DIR:OUT;SFP:1102; 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: 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 x-ms-exchange-antispam-messagedata: uNQoli9O1DIIIHp+LeP2/P4pIrM01ejIp0jRoOFjFqYWpdKi0tsyF6Tvja786lQqGDgTjqG6I9cNjabBFZJFLJI1MB41eVLBADgJElCFDmvYFNe21iYEMlSvxJr1XO+BkqHSUB5CPgVDXm7/T/C11w== 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: 51e35313-bd2c-464e-4dbe-08d7d0eabf2b X-MS-Exchange-CrossTenant-originalarrivaltime: 25 Mar 2020 18:31:34.2486 (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: csylkRkBKmbcGoDECElDkgFKO9V2hBSrefVzv6TTOop8SJfJgMLB9amx+/0JIw36Dd0ei0LEY7Dt2XWhDAz+NL2HKX/lQa2dBSeCbqYHOC0= X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW2PR2101MB0938 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tianyu Lan Sent: Tuesday, March 24, 2020 1= 2:57 AM >=20 > When a guest VM panics, Hyper-V should be notified only once via the > crash synthetic MSRs. Current Linux code might write these crash MSRs > twice during a system panic: > 1) hyperv_panic/die_event() calling hyperv_report_panic() > 2) hv_kmsg_dump() calling hyperv_report_panic_msg() >=20 > Fix this by not calling hyperv_report_panic() if a kmsg dump has been > successfully registered. The notification will happen later via > hyperv_report_panic_msg(). >=20 > Signed-off-by: Tianyu Lan > --- > Change since v1: > - Update commit log >=20 > Change since v2: > - Update comment > --- > drivers/hv/vmbus_drv.c | 16 ++++++++++++++-- > 1 file changed, 14 insertions(+), 2 deletions(-) >=20 Reviewed-by: Michael Kelley