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Sat, 24 Feb 2024 19:42:17 +0000 Date: Sat, 24 Feb 2024 11:42:13 -0800 From: Dan Williams To: Jonathan Cameron , Dan Williams CC: Shuai Xue , Borislav Petkov , Ira Weiny , "Luck, Tony" , "james.morse@arm.com" , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v11 1/3] ACPI: APEI: send SIGBUS to current task if synchronous memory error not recovered Message-ID: <65da46955fe12_2bce92941a@dwillia2-mobl3.amr.corp.intel.com.notmuch> References: <20221027042445.60108-1-xueshuai@linux.alibaba.com> <20240204080144.7977-2-xueshuai@linux.alibaba.com> <20240219092528.GTZdMeiDWIDz613VeT@fat_crate.local> <65d82c9352e78_24f3f294d5@dwillia2-mobl3.amr.corp.intel.com.notmuch> <20240223120813.00005d1f@Huawei.com> <20240223121701.00004bcf@Huawei.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20240223121701.00004bcf@Huawei.com> X-ClientProxiedBy: MW4PR03CA0012.namprd03.prod.outlook.com (2603:10b6:303:8f::17) To PH8PR11MB8107.namprd11.prod.outlook.com (2603:10b6:510:256::6) Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH8PR11MB8107:EE_|SJ2PR11MB8299:EE_ X-MS-Office365-Filtering-Correlation-Id: ad9b3920-538f-43fd-d2ad-08dc3570b556 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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They are either asynchronous protocol errors, or effectively > > > equivalent to CPER_SEC_PLATFORM_MEM notifications. > > > > Not a good example, CPER_SEC_PLATFORM_MEM is sometimes signaled via SEA. > > > > Premature send.:( > > One example I can point at is how we do signaling of memory > errors detected by the host into a VM on arm64. > https://elixir.bootlin.com/qemu/latest/source/hw/acpi/ghes.c#L391 > CPER_SEC_PLATFORM_MEM via ARM Synchronous External Abort (SEA). > > Right now we've only used async in QEMU for proposed CXL error > CPER records signalling but your reference to them being similar > to CPER_SEC_PLATFORM_MEM is valid so 'maybe' they will be > synchronous in some physical systems as it's one viable way to > provide rich information for synchronous reception of poison. > For the VM case my assumption today is we don't care about providing the > VM with rich data, so CPER_SEC_PLATFORM_MEM is fine as a path for > errors whether from CXL CPER records or not. Makes sense... and I was not precise when I mentioned the equivalency, I was only considering x86.