Re: [PATCH v2 1/2] ACPI: APEI: set memory failure flags as MF_ACTION_REQUIRED on synchronous events

[Shuai Xue]

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