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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: pZD7aFbIlkJzg3uuR8cvsmz35m/F9VOggNzhVXrHaft+FYKsngyBzJr0Uv0438qdKMg/bxtjAKVeZNv1DTziu0PQrjSWbnIqmcpFCeObo2pFCoB9bMgaEDZhkV/SLWylBXm8iBhHlaj2Yp+wYz/vhjHeqCUf3VnJqDnQBrppqZYtYJYie8xukHWJ18IBIWnT/cxigYp1wwN7c79t8MKXtHgplQY2zc4SZ/wbRtjtSBzNUf0/202errkY2NJUmxF1FVKZ7DAIt15chxBOmY4nEDCp74HB5AdqORQDKVAzst3mertBoRGqEK9bWqVZOY3I3nHp9Bb/LSfhSNX0TaUrHDLFaXJ3srXEWf+zeJEuZCBYdcVDEXM5qriInEexObnHVp5tthyLVbWX9w/dkr4HDZ+v8HDnwo1d72Itdr2CJghty1abLAfBXRK0jGd18kn0 X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Oct 2026 17:16:40.9046 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e35c5147-a201-4959-9e18-08df36a99069 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: DU2PEPF00028D05.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR08MB8268 On 10/30/26 16:19, Jonathan Cameron wrote: > On Fri, 30 Oct 2026 12:51:47 +0100 > Pierre Gondois wrote: > >> On 10/25/26 00:05, Ashok Raj wrote: >>> On Fri, Oct 23, 2026 at 05:04:05PM -0700, Jonathan Cameron wrote: >>>> On Sat, 24 Oct 2026 00:40:33 +0200 >>>> Mauro Carvalho Chehab wrote: >>>> >>>>> On Fri, 23 Oct 2026 14:26:21 -0700 >>>>> Jonathan Cameron wrote: >>>>> >>>>>> On Thu, 22 Oct 2026 09:07:25 +0200 >>>>>> Pierre Gondois wrote: >>>>>> >>>>>>> On 10/20/26 19:10, Jonathan Cameron wrote: >>>>>>>> On Mon, 19 Oct 2026 22:38:39 +0200 >>>>>>>> Pierre Gondois wrote: >>>>>>>> >>>>>>>>> The support is mostly duplicated from Memory Error Section handling. >>>>>>>>> Other than differences coming from the content of Memory Error >>>>>>>>> Section 1 and 2, differences in the support are: >>>>>>>>> >>>>>>>>> - v2 do not rely on a compact "struct cper_mem_err_compact" struct. >>>>>>>>> This structure was used to support older versions of the Memory >>>>>>>>> Error Section (1). This is not needed for the new structure. >>>>>>>>> >>>>>>>>> - The compact version is also used by the tracing framework. >>>>>>>>> To avoid relying and propagating a non-standard record format, >>>>>>>>> through trace event (cf. extlog_mem event) the new trace event >>>>>>>>> prints each field individually. >>>>>>>>> >>>>>>>>> The last patch of the serie was only build-tested due to the >>>>>>>>> absence of relevant hardware. apei_mce_report_mem_error() and >>>>>>>>> arch_apei_report_mem_error() implementations were also removed since >>>>>>>>> last version. >>>>>>>>> >>>>>>>>> It will also require a proper handling from the rasdaemon. Applying >>>>>>>>> this last patch without rasdaemon support will silent the reports of >>>>>>>>> Memory Error Section 2 error, cf. ras_userspace_consumers() check. >>>>>>>> Hi Pierre, >>>>>>>> >>>>>>>> I'd slow down a bit. We are mid merge window and convention is normally >>>>>>>> one version a week or so anyway. Better to gather up feedback from >>>>>>>> a number of folk and spin only one revision to cover it all. >>>>>>>> >>>>>>> Hello Jonathan, >>>>>>> >>>>>>> Ok sure, as the v1 was reviewed quickly I thought there was a chance >>>>>>> of having the serie accepted quickly aswell. I ll wait a bit more. >>>>>>> >>>>>>> Thanks for the review, >>>>>>> >>>>>>> Pierre >>>>>>> >>>>>> A general question that came up in a related thread with one of >>>>>> our RAS architects. How does firmware decide what to send? As far as >>>>>> I can tell firwmare has no way to know whether the OS understands the CPER >>>>>> Memory Section 2. >>>>>> >>>>>> So options that come to mind. >>>>>> 1. Firmware must send a CPER with both Memory Section and Memory Section 2. >>>>> Please don't do this: this would require either Kernespace or userspace to >>>>> discard one of the reports, only if the other one is there, which can be >>>>> tricky. Could be done more easily at userspace, but only if some database >>>>> support is enabled, but, at least on rasdaemon, this is an optional module. >>>> Good. That confirms my view that is horrible. >>> Hi Jonathan, >>> >>> I agree that an _OSC capability is the right long-term solution. >>> >>> Firmware should select one native CPER format based on OS support, rather >>> than emit both Section 1 and Section 2 and leave deduplication to the OS >>> or userspace. >>> >>> For a Section 2-capable kernel, we may still avoid a second GHES notifier >>> chain: preserve the existing struct cper_sec_mem_err * contract and give >>> it a lossy Section 1 projection of a Section 2 record. The conversion must >>> translate validation bits and clear validity for values that cannot be >>> represented, rather than truncate them. >> I understand we might want to emit a new extlog_mem2_event and a lossy >> extlog_mem_event for legacy userspace, but I'm not sure to follow how >> you want to do it. >> >> Do you suggest that we only need one notifier (ghes_report_mem_chain) >> and that we should not add ghes_report_mem2_chain ? This would mean >> that the .notifier_call (= ghes_edac_report_mem_error) should handle >> both cper_sec_mem_err/cper_sec_mem_err2 struct. >> >> Another solution would be to keep the ghes_report_mem2_chain, >> which would be responsible of creating the lossy v1 struct and >> triggering the original ghes_report_mem_chain. >> >>> That preserves legacy EDAC consumers, but cannot carry all Section 2 data. >>> Updated userspace needs the native Section 2 payload through a >>> full-fidelity path, such as the existing GUID-tagged raw CPER event. >>> >>> This does mean an updated userspace listener may receive both the legacy >>> EDAC summary and the raw Section 2 record for the same firmware error. >>> They are two kernel views, not two firmware reports. We should therefore >>> add a shared GHES record/section ID to both events, so userspace can >>> correlate them reliably; address and timestamp are not sufficient. >>> >>> So _OSC solves firmware selection for old versus new kernels, while a >>> Section 1 projection plus the raw payload handles legacy versus updated >>> consumers on a new kernel. >>> >>> Thoughts? >> This will put more burden on the firmware, but this seems the right >> thing to do. I ll share the thread with the group working more closely >> on the architecture aswell, > We have will have a code first proposal for the _OSC part shortly. Just going > through internal review. I'll make sure you + others here are on the +CC. Ok thanks, If you can also also add Mark Brown