linux-kernel - Re: [PATCH v2 1/2] ACPI: APEI: set memory failure flags as MF_ACTION

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Message-ID: <e38a84f2-6b8f-27a5-2898-98e637dca025@linux.alibaba.com>
Date:   Fri, 17 Mar 2023 09:12:40 +0800
From:   Shuai Xue <xueshuai@...ux.alibaba.com>
To:     "Luck, Tony" <tony.luck@...el.com>,
        HORIGUCHI NAOYA(堀口 直也) 
        <naoya.horiguchi@....com>
Cc:     "rafael@...nel.org" <rafael@...nel.org>,
        "lenb@...nel.org" <lenb@...nel.org>,
        "james.morse@....com" <james.morse@....com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "jarkko@...nel.org" <jarkko@...nel.org>,
        "linmiaohe@...wei.com" <linmiaohe@...wei.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "xiexiuqi@...wei.com" <xiexiuqi@...wei.com>,
        "lvying6@...wei.com" <lvying6@...wei.com>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "cuibixuan@...ux.alibaba.com" <cuibixuan@...ux.alibaba.com>,
        "baolin.wang@...ux.alibaba.com" <baolin.wang@...ux.alibaba.com>,
        "zhuo.song@...ux.alibaba.com" <zhuo.song@...ux.alibaba.com>
Subject: Re: [PATCH v2 1/2] ACPI: APEI: set memory failure flags as
 MF_ACTION_REQUIRED on synchronous events



On 2023/3/17 AM12:45, Luck, Tony wrote:
>> On x86 platform with MCA, patrol scrub errors are asynchronous error, which are
>> by default signaled with MCE. It is possible to downgrade the patrol scrub SRAO
>> to UCNA or other correctable error in the logging/signaling behavior and signal
>> CMCI only.
>>
>> As far as I know, on X86 platform, MCE is handled in do_machche_check() and only
>> asynchronous error is notified through HEST. Can we safely drop ACPI_HEST_NOTIFY_MCE
>> and only consider ACPI_HEST_NOTIFY_SEA as synchronous notification?
>>
>> Tony, do you have any comments on this? Please point out if I am wrong. Thank you.
> 
> You are correct. On x86 the HEST notifications are always asynchronous. The only
> synchronous events are machine check with IA32_MCi_STATUS.AR == 1 (patrol
> scrub and cache eviction machine checks are async and do not set this bit).
> 
> -Tony

Thank you for confirmation. I will drop ACPI_HEST_NOTIFY_MCE in is_hest_sync_notify().

Best Regards.
Shuai