linux-kernel - Re: [PATCH v10 1/4] ACPI: APEI: set memory failure flags as MF_ACTION

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Date: Fri, 22 Dec 2023 09:07:50 +0800
From: Shuai Xue <xueshuai@...ux.alibaba.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: bp@...en8.de, wangkefeng.wang@...wei.com, tanxiaofei@...wei.com,
 mawupeng1@...wei.com, tony.luck@...el.com, linmiaohe@...wei.com,
 naoya.horiguchi@....com, james.morse@....com, gregkh@...uxfoundation.org,
 will@...nel.org, jarkko@...nel.org, linux-acpi@...r.kernel.org,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
 linux-edac@...r.kernel.org, acpica-devel@...ts.linuxfoundation.org,
 stable@...r.kernel.org, x86@...nel.org, justin.he@....com, ardb@...nel.org,
 ying.huang@...el.com, ashish.kalra@....com, baolin.wang@...ux.alibaba.com,
 tglx@...utronix.de, mingo@...hat.com, dave.hansen@...ux.intel.com,
 lenb@...nel.org, hpa@...or.com, robert.moore@...el.com, lvying6@...wei.com,
 xiexiuqi@...wei.com, zhuo.song@...ux.alibaba.com
Subject: Re: [PATCH v10 1/4] ACPI: APEI: set memory failure flags as
 MF_ACTION_REQUIRED on synchronous events

On 2023/12/21 21:55, Rafael J. Wysocki wrote:
> On Mon, Dec 18, 2023 at 7:45 AM Shuai Xue <xueshuai@...ux.alibaba.com> 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@...ux.alibaba.com>
>> Tested-by: Ma Wupeng <mawupeng1@...wei.com>
>> Reviewed-by: Kefeng Wang <wangkefeng.wang@...wei.com>
>> Reviewed-by: Xiaofei Tan <tanxiaofei@...wei.com>
>> Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
>> Reviewed-by: James Morse <james.morse@....com>
> 
> 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