On 2023/12/21 21:55, Rafael J. Wysocki wrote: > On Mon, Dec 18, 2023 at 7:45 AM Shuai Xue <xueshuai@xxxxxxxxxxxxxxxxx> wrote: >> >> There are two major types of uncorrected recoverable (UCR) errors : >> >> - Synchronous error: The error is detected and raised at the point of the >> consumption in the execution flow, e.g. when a CPU tries to access >> a poisoned cache line. The CPU will take a synchronous error exception >> such as Synchronous External Abort (SEA) on Arm64 and Machine Check >> Exception (MCE) on X86. OS requires to take action (for example, offline >> failure page/kill failure thread) to recover this uncorrectable error. >> >> - Asynchronous error: The error is detected out of processor execution >> context, e.g. when an error is detected by a background scrubber. Some data >> in the memory are corrupted. But the data have not been consumed. OS is >> optional to take action to recover this uncorrectable error. >> >> When APEI firmware first is enabled, a platform may describe one error >> source for the handling of synchronous errors (e.g. MCE or SEA notification >> ), or for handling asynchronous errors (e.g. SCI or External Interrupt >> notification). In other words, we can distinguish synchronous errors by >> APEI notification. For synchronous errors, kernel will kill the current >> process which accessing the poisoned page by sending SIGBUS with >> BUS_MCEERR_AR. In addition, for asynchronous errors, kernel will notify the >> process who owns the poisoned page by sending SIGBUS with BUS_MCEERR_AO in >> early kill mode. However, the GHES driver always sets mf_flags to 0 so that >> all synchronous errors are handled as asynchronous errors in memory failure. >> >> To this end, set memory failure flags as MF_ACTION_REQUIRED on synchronous >> events. >> >> Signed-off-by: Shuai Xue <xueshuai@xxxxxxxxxxxxxxxxx> >> Tested-by: Ma Wupeng <mawupeng1@xxxxxxxxxx> >> Reviewed-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx> >> Reviewed-by: Xiaofei Tan <tanxiaofei@xxxxxxxxxx> >> Reviewed-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx> >> Reviewed-by: James Morse <james.morse@xxxxxxx> > > Applied as 6.8 material. > > The other patches in the series still need to receive tags from the > APEI designated reviewers (as per MAINTAINERS). > > Thanks! > Thank you :) I will wait more feedback of other patches from MAINTAINERS. Cheers, Shuai
