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Peter Anvin" , yazen.ghannam@amd.com, Smita.KoralahalliChannabasappa@amd.com Subject: [PATCH 0/5] x86/mce: Handle error simulation failures in mce-inject module Date: Wed, 15 Sep 2021 18:27:34 -0500 Message-Id: <20210915232739.6367-1-Smita.KoralahalliChannabasappa@amd.com> X-Mailer: git-send-email 2.17.1 Content-Type: text/plain X-ClientProxiedBy: BN0PR04CA0045.namprd04.prod.outlook.com (2603:10b6:408:e8::20) To SN6PR12MB2685.namprd12.prod.outlook.com (2603:10b6:805:67::33) MIME-Version: 1.0 Received: from ethanolx50f7host.amd.com (165.204.184.1) by BN0PR04CA0045.namprd04.prod.outlook.com (2603:10b6:408:e8::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4523.14 via Frontend Transport; Wed, 15 Sep 2021 23:28:13 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 094285d3-9e38-418d-2990-08d978a07d6e X-MS-TrafficTypeDiagnostic: SA0PR12MB4512: X-LD-Processed: 3dd8961f-e488-4e60-8e11-a82d994e183d,ExtAddr X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8273; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?C0uTmGwegp7lUNfVC31rIdenzPEjHwErZnRk9UWzFXUP0NvLdysFwEia6ayK?= =?us-ascii?Q?0VIOr0ygnnNTjuYyo8rI9rDUAx3bHK5wIdJHT78w2pWDzqgbdX4q8Z/Pg+z+?= =?us-ascii?Q?nyE3hdKMTCKGbzCObD+8LV74jUfji3kWKG+u8QJVSBVLXyllRnVkNuukecV9?= =?us-ascii?Q?ivL6yNKAqZFYpdmdNe6N0Lw+L3ezDQ7/PW8eAE6V8FQ7dobqeQv5U7Jfw+zJ?= =?us-ascii?Q?60IqoKR1yrr6iV/UwqTkDe6g4M7hV3fPxMuogisiwOmDrd//OCcaptWfm9K6?= =?us-ascii?Q?Rfun+HZg3L9O81b+aW4ebkNew9KVgPPxwioRbKPQGnuyI1GvNYtf8rdoK47r?= =?us-ascii?Q?mySFTMbNCtqp7cnjJmda6YyEo4CxKHJGVAgEVgE88sW4WQ1imtVyzUV3tGdN?= =?us-ascii?Q?WYnP0UKg0ii60ccrmqq2vzHatV/TbUMNkHl9w5xkLrreW3Gk/BSnDrUHHE/z?= =?us-ascii?Q?lx2Gbtjx6HuYuu9UCv8ON6UyguL0FArMwXUKXT5Pp1hIaG8+grXbOhQIbx8o?= =?us-ascii?Q?l0LOOtZ8KwvPrY7q7LgXS4D4BpwNkGjtDqW4vVpJw+DGgvLQXLI5iLUemrjL?= =?us-ascii?Q?PxosQZVCMHnD4x4whTPevCBK8p7FQkJkll1w3DL0rFE7d7orIFvtyARmmWdN?= =?us-ascii?Q?C3z0M136KIbgHigYtIHr+363nZRjEW8+KNRCi+4D9mtn0ZPzLMmvU6hH1Tsl?= =?us-ascii?Q?YXKy1/5zCZQzLFpjwTXn3L+mxLHYNNy0AYaKYOfM9cVdldEtaQ5JCKl7PRdt?= =?us-ascii?Q?hnhCVHExV3aoGGxDPGBIDjXpMMUeCkVh2DVGG/nXLHopAqEiqA9xvwq4pkBu?= =?us-ascii?Q?qdZ271v6BUUESQYY03s6IHxh8H39WmoBJqyHXYOwB+56aq43j9BmxSUvxhzt?= =?us-ascii?Q?nUgAbUwfwhFfnIwOYU7rtw62tvB4g8++yXqueGMN6PmCzoUrzY93UJ58EB0g?= =?us-ascii?Q?lj4wWvDmUNc6RHYHAKr1HUTxIoAut31DhpcbVx/MSkoXRvAWEurAeSAQXWqK?= =?us-ascii?Q?UtCJKNWtuyXOMAxeDQytvXAPL1M9riuMlLt3ZXifJqITUDdJhmagoNtYFk7j?= =?us-ascii?Q?VRdQG9rfAUWyHKwHVSvrpDRvna9CnymQ/UJdxYa3ILyOSYvjDTpuJwmx7kaF?= =?us-ascii?Q?jqBF3qWsgDibWyNqCT0a9ZJSbxR95V5pdMIOBE3qhz2I/v5mEu+Ahd4g2x3T?= =?us-ascii?Q?m59EG8XWuqFhXXcRsZbi/UQtUkFMwzXXS5oIk8u9H7/ND/tt0brrARXHKpfU?= =?us-ascii?Q?5rS8I26eY2pR9TzVxKvWcpgHyxPAPo0GSTkcvC41l0xeMHRJdI6VQImMZWI1?= =?us-ascii?Q?f9PSxtZfc3EhUjIgltHRyIhW?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 094285d3-9e38-418d-2990-08d978a07d6e X-MS-Exchange-CrossTenant-AuthSource: SN6PR12MB2685.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Sep 2021 23:28:15.0454 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: j9+P+1urjywTKtPoAVe0zxNQ5eXMqOBCN1hKWu0RAMp1f6GgNswVwPus/TH6IL+7u1XQGXrsxJL5ay9VhPduCA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4512 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This series of patches handles the scenarios where error simulation fails silently on mce-inject module. It also cleans up the code by replacing MCx_{STATUS, ADDR, MISC} macros with msr_ops and finally returns error code to userspace on failures injecting the module. Error simulation fails if the bank is unpopulated (MCA_IPID register reads zero) or if the platform enforces write ignored behavior on status registers. The first patch checks for an unpopulated bank by reading the value out from MCA_IPID register and the fourth patch checks for writes ignored from MCA_STATUS and MCA_DESTAT. The second patch sets valid bit before doing error injection. The third patch does some cleanup by replacing MCx_{STATUS, ADDR, MISC} macros with msr_ops. The final patch returns error code to userspace from mce-inject module. Smita Koralahalli (5): x86/mce/inject: Check if a bank is unpopulated before error simulation x86/mce/inject: Set the valid bit in MCA_STATUS before error injection x86/mce: Use msr_ops in prepare_msrs() x86/mce/inject: Check for writes ignored in status registers x86/mce/mce-inject: Return error code to userspace from mce-inject module arch/x86/kernel/cpu/mce/core.c | 1 + arch/x86/kernel/cpu/mce/inject.c | 80 ++++++++++++++++++++++++-------- 2 files changed, 62 insertions(+), 19 deletions(-) -- 2.17.1