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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Mar 2025 17:07:04.3740 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 75078d1c-f6fe-4993-9b40-08dd6e1af6d1 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: DB1PEPF000509EE.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI0PR08MB10918 X-Rspam-User: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 965372000F X-Stat-Signature: gde7imoxhiaegafna4zujitu1spcuoga X-HE-Tag: 1743181631-770037 X-HE-Meta: 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 /SUdbt+i 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi, > > > 在 2025/2/13 0:21, Catalin Marinas 写道: > > (catching up with old threads) > > > > On Mon, Dec 09, 2024 at 10:42:54AM +0800, Tong Tiangen wrote: > > > For the arm64 kernel, when it processes hardware memory errors for > > > synchronize notifications(do_sea()), if the errors is consumed within the > > > kernel, the current processing is panic. However, it is not optimal. > > > > > > Take copy_from/to_user for example, If ld* triggers a memory error, even in > > > kernel mode, only the associated process is affected. Killing the user > > > process and isolating the corrupt page is a better choice. > > > > I agree that killing the user process and isolating the page is a better > > choice but I don't see how the latter happens after this patch. Which > > page would be isolated? > > The SEA is triggered when the page with hardware error is read. After > that, the page is isolated in memory_failure() (mf). The processing of > mf is mentioned in the comments of do_sea(). > > /* > * APEI claimed this as a firmware-first notification. > * Some processing deferred to task_work before ret_to_user(). > */ > > Some processing include mf. > > > > > > Add new fixup type EX_TYPE_KACCESS_ERR_ZERO_MEM_ERR to identify insn > > > that can recover from memory errors triggered by access to kernel memory, > > > and this fixup type is used in __arch_copy_to_user(), This make the regular > > > copy_to_user() will handle kernel memory errors. > > > > Is the assumption that the error on accessing kernel memory is > > transient? There's no way to isolate the kernel page and also no point > > in isolating the destination page either. > > Yes, it's transient, the kernel page in mf can't be isolated, the > transient access (ld) of this kernel page is currently expected to kill > the user-mode process to avoid error spread. I'm not sure about how this works. IIUC, the memory_failure() wouldn't kill any process if page which raises sea is kernel page (because this wasn't mapped). But, to mark the kernel page as posision, I think it also need to call apei_claim_sea() in !user_mode(). What about calling the apei_claim_sea() when fix_exception_me() successed only in !user_mode() case? Thanks. > > The SEA processes synchronization errors. Only hardware errors on the > source page can be detected (Through synchronous ld insn) and processed. > The destination page cannot be processed. > > > >