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 Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BEC17C83F09 for ; Wed, 9 Jul 2025 09:47:18 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.1038003.1410541 (Exim 4.92) (envelope-from ) id 1uZROP-0001Dr-RW; Wed, 09 Jul 2025 09:47:09 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1038003.1410541; Wed, 09 Jul 2025 09:47:09 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uZROP-0001Dk-OX; Wed, 09 Jul 2025 09:47:09 +0000 Received: by outflank-mailman (input) for mailman id 1038003; Wed, 09 Jul 2025 09:47:09 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uZROO-0001De-VD for xen-devel@lists.xenproject.org; Wed, 09 Jul 2025 09:47:08 +0000 Received: from NAM11-BN8-obe.outbound.protection.outlook.com (mail-bn8nam11on2062f.outbound.protection.outlook.com [2a01:111:f403:2414::62f]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id ac6fe863-5ca9-11f0-a317-13f23c93f187; Wed, 09 Jul 2025 11:47:06 +0200 (CEST) Received: from BL1PR13CA0092.namprd13.prod.outlook.com (2603:10b6:208:2b9::7) by LV8PR12MB9082.namprd12.prod.outlook.com (2603:10b6:408:180::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8901.25; Wed, 9 Jul 2025 09:47:02 +0000 Received: from BL6PEPF00020E60.namprd04.prod.outlook.com (2603:10b6:208:2b9:cafe::cb) by BL1PR13CA0092.outlook.office365.com (2603:10b6:208:2b9::7) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.8943.6 via Frontend Transport; Wed, 9 Jul 2025 09:47:01 +0000 Received: from SATLEXMB04.amd.com (165.204.84.17) by BL6PEPF00020E60.mail.protection.outlook.com (10.167.249.21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8901.20 via Frontend Transport; Wed, 9 Jul 2025 09:47:01 +0000 Received: from localhost (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Wed, 9 Jul 2025 04:46:59 -0500 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: ac6fe863-5ca9-11f0-a317-13f23c93f187 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=ku7gt9fk5hyxSpHQycwWWigfP55pjW7QZ2QRaaFjMO/usVv3U/wmA723zqYfyUxCUWXIYsoUFMNpq9xsC0EjVcit3h1yumkrckHjY6nJQ+r6lv9wtieK4g6BG2sJobm9yYQI1LPkmxeCVzbGL0CqenAjLqQYlw2aoKA4zbm6uquQOJXlDAGCqjUeV07snc4ItvJ6riXZf+0lT+axIRYVrYIdTrJfzDM5aIsMyT7Da18dDZ4EY2+2WTdc0CTmJt8jHJOLR1DzWJ5to9HqpmKAAJDA+nFJ1k9DBE4Cd94twUHxdspPHLscNS0BJZFsEO3o+7sD76fYsh6s7Laj8Of3bg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=N6GOUGGCYEhSHpIHqQ404WRzGd5lPz+cYjNRQsPeuQU=; b=m/oHM2wUJxK69/OWaTbBJhcA9jqPhuAGVthStmPSQDTcfuZ554FmbZ8Hw/aZXQW/AJHITtlMS1PxIJOYR/z+BpdZGZsWL80nUm2/bXy/nDbLgmRel6Pi8Xl9Xj/2cg31kdynTSBxB/k4zSyI04d0amkLU5D/PhPJt1mDFCmtGbeZTgEHEcGzqJiYvu4B3Fn12ziU64yHxP/f8j+qtLR5J0BVg84PSCtWqpiAM5/9Avzrml1TPd49q8KZlfZg585yWeURrfaWaKhgJDLilzp/3bp+S/3bbT4etRCQK3jB7wH/U6hT6B9dS11hbPwUISyMOBqtVDYx9OS66R+2pp286Q== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=lists.xenproject.org smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=N6GOUGGCYEhSHpIHqQ404WRzGd5lPz+cYjNRQsPeuQU=; b=m3lOYiu8CqquA6+LR10ujWyIu3p+Uq4nnVSmqPJAkIY9gRH4tPZCCJSFqKeWRioLNxChI5pumKw5bB0vyw2SA3a6rEbwdiUdF1RLSSk59maSV30psW91f64UOLN8DdsmquSZF7mKvtB4ri/Wn0qHw+ryU2utX5iKJCjIAXUcgBU= X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" Date: Wed, 9 Jul 2025 11:46:58 +0200 Message-ID: CC: , , , , Subject: Re: [PATCH v2 2/2] xen/x86: introduce MCE_NONFATAL From: Alejandro Vallejo To: Stefano Stabellini , X-Mailer: aerc 0.20.1 References: <20250708183238.3104638-2-stefano.stabellini@amd.com> In-Reply-To: <20250708183238.3104638-2-stefano.stabellini@amd.com> X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF00020E60:EE_|LV8PR12MB9082:EE_ X-MS-Office365-Filtering-Correlation-Id: 3acd4bbe-5212-40f3-126f-08ddbecd8dc5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|82310400026|36860700013|1800799024; X-Microsoft-Antispam-Message-Info: =?utf-8?B?VG5QV3hoVHVIekk4YXdOTG5qVHE0STAvdVcrNHNHS0RpeWZ5b3Y2OGllb2Ni?= =?utf-8?B?NmRSVjM0bDZlTTE4dHFDNklSRisvMWtrME5OdGdvdk41OUxidGIxcENBdkIy?= =?utf-8?B?UFdxRmlnVjV1eFViTGdZRC9FY25CcUhkVm12ZmY4UUNTYm9MZzlEMUZ4SE9X?= =?utf-8?B?R1MvUm9DcTFRYU1KejE5TjlDcmRESC9vQWJtWklaOFZsVUpycVQ5a1FVNjEv?= =?utf-8?B?cGRidHdYNmtERG83eThXRGFqdWhDYlJDTzhTVDBLYVZDNlpHTmpQZ2Zjejhj?= =?utf-8?B?dWhqL3VaaXBwOXIxTFNRWGRqcUEwS0xVaFZobkNxK2lOblFUb21zOWRmT09y?= =?utf-8?B?Rnd2MS90QmZlUTlEZ1JhMlM5ZVdDOVUxOFZqNUw3U3VFTCs2YjVrRkQ1NEth?= =?utf-8?B?SlZod1M0Vk5lQ3E3STdXSTU2YTRVeWM1QmpNbjI4NWEyeVNQQWtYeHZnWnQ0?= =?utf-8?B?SHRxQnVSY3haZ01oV252MWRFaHU5YjBweTJMQWRsTmdtV3N1bEpacmduS3ZN?= =?utf-8?B?bVdFdVZ4WGZ6SWJURVdkR2xyWitHcnVkSUxXV0NwaVVmbnVOSllxNHl0QWlt?= =?utf-8?B?K3M5Ny9oaEx4RTNaNkdQSURxM0YyV3F6VGJwaVNoRGpmRHJhV2ZSUUxVZUVw?= =?utf-8?B?UzkyVllBL0srQUxVZjVvY1Roc0xhdlQrb2JtT21hNHdQd09tMVZDdTRreHM2?= =?utf-8?B?L1pIK0dyWlNYMGhrbnRmQ2FBRUo5TWxLc3RqNFNhaXdCUlp0NUZLUGtycGlN?= =?utf-8?B?QXpkT28zbUFYd3ZDcFpDK3dRaC83TFl4V3NiWnVzanNpTHFvL01iaENxVHp3?= =?utf-8?B?Z3F5dmlNQnVsN0tYV1dBRmtxdzN0ZHYyNTZTcHBseTFtTXdxZmxJdFRCUWNO?= =?utf-8?B?VVp2amhBaXhOSm9HYXpzSDZQT3JUMnhlUzZwYWtCQVlDd0JLWDhQMkUxYlFH?= =?utf-8?B?NTBWWUxRV2pKbHVscWx0a3UxUmJ6SkZuVHlqTGhJUTB3V3pGd1hTM05mdlBq?= =?utf-8?B?aUxCeXlFM1FaM1pLc056Z0lhNFQ1VnBucHdKc3FPOHpNUXlraFdmRkdSREgz?= =?utf-8?B?eGt5Y1JQRWQwcS9EcCtyRmNJUTlKakU5MTJEM1VvZmQ2VUd0eEJkL2M3UHhp?= =?utf-8?B?a1BPZnpDVU9PUjNIMUlYNndVVjBVMDFXc01KeFMxcVg3RFJkSlB4NnVUUDQ0?= =?utf-8?B?Zi9vbVlFWE1CTzhYKzYycWdoUGIxb3I4cUtCMWZMSGpVc0RkdkNHcjJwNzdu?= =?utf-8?B?QkM2KzBrY2tNYkpldGo0L3BBYnlheGRXdXAxUG9RVHcvbmNLdVpWRjdCKzZk?= =?utf-8?B?c3NTMFc2M1RiUlZvcnhZMGlKOTB2bmpuZUtoRlRuUStyYURhZnZtcFRqZDF0?= =?utf-8?B?L2tKUy9jaFd6Y2YzZ2tOZ013Tmg4ZlNSZ1BoMlFudkZPd045cnlCd2oySGJz?= =?utf-8?B?ZVAyeDlqc0hoalMwajh1VVdQSVE5dWdESlFBb2Y4OWFsRkdKWnNwcXo4aGNR?= =?utf-8?B?WFBjSWFaUVYzNVhpTmd4d0FPRHlIcExXNmtuZ2M0a0JnQ3pramVrcWhQQjcx?= =?utf-8?B?L3J1ZFp5b1UzTmZWVDBhKzFLdG1sZkFtQTE3Smg0dDRxemRaaG9NWnJCOHVm?= =?utf-8?B?SHdydlJHeHMvN25MVTlmdzRvTVd6anB5ZFhpVGlmaXFJV204L3BQeW44Z2h1?= =?utf-8?B?NjJ1MHBGNWpMOUYrOFFPTmJCTUZXQkNJc041TWpNOVdGTEluL0doQ1FyNG1v?= =?utf-8?B?cFdVZ0ZXVGp0T09hcVRDYmdNdEk4bWQ0aVRxUzFaeWprOCtyTVFWVEd6WHRu?= =?utf-8?B?VENxT3dXN3hVY1JiclVHaEQxT1FVNzIvcWdrQTJOY3BFeWNLeVpVcFM5bFlV?= =?utf-8?B?QVhjOWxLS25wbjdwM1RBdWNyMWc3elhjeEJGbnFwVnhLY25wNFlIOTYrVEYw?= =?utf-8?B?RzBVVW1ldEE0VEdyaGFSRWRZSzJ3bVQwNmovczFxQW1ickRvVlFQejE5SFFS?= =?utf-8?B?Uis3TitKZHl4UkJTT2UzWVV2QWpQWERBQThkL0pJekhEZGhvUkg1Zm16RjBW?= =?utf-8?Q?ABFRYb?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(376014)(82310400026)(36860700013)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Jul 2025 09:47:01.2122 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3acd4bbe-5212-40f3-126f-08ddbecd8dc5 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF00020E60.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV8PR12MB9082 On Tue Jul 8, 2025 at 8:32 PM CEST, Stefano Stabellini wrote: > Today, checking for non-fatal MCE errors on AMD is very invasive: it > involves a periodic timer interrupting the physical CPU execution at > regular intervals. Moreover, when the timer fires, the handler sends an > IPI to all physical CPUs. > > Both these actions are disruptive in terms of latency and deterministic > execution times for real-time workloads. They might miss a deadline due > to one of these IPIs. Make it possible to disable non-fatal MCE errors > checking with a new Kconfig option (MCE_NONFATAL). > > Signed-off-by: Stefano Stabellini LGTM. Reviewed-by: Alejandro Vallejo Cheers, Alejandro