Re: [PATCH v6 3/7] acpi: apei: remove the unused code

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi gengdongjiu,

On 11/09/17 13:04, gengdongjiu wrote:
> On 2017/9/9 2:17, James Morse wrote:
>> On 04/09/17 12:43, gengdongjiu wrote:
>>> On 2017/9/1 1:50, James Morse wrote:
>>>> On 28/08/17 11:38, Dongjiu Geng wrote:
>>>> If you aren't handling the notification, why is this is in the HEST at all?
>>>> (and if its not: its not firmware-first)
>>
>>> For the SEI notification, may be we can parse and handle the CPER record other than the Error physical address
>>
>> Sure, but I only see this cleanup patch in this series, where does APEI learn
>> about NOTIFY_SEI? As this is nothing will ever touch those CPER records, if
>> you're using GHESv2 firmware will be prevented from delivering subsequent
>> notifications.

> James, whether it is possible you can review the previous v5 patch which adds the support for

Spreading 'current discussion' over two versions is a problem for anyone trying
to follow this series.

If you post a newer version its normal for people to delete the older versions.
When you post a new version you should be happy that its the latest and greatest.


> NOTIFY_SEI? thanks in advancecIn that patch, I share the SEI notification
handling with the SEA
> notification handling to avoid duplicated code.

You may be able to share some of the code, but I don't think you should share
the list of GHES between notification methods.
This leads to races between the firmware and OS: If CPU-A has received an SEI
firmware would have to avoid generating an SEA on CPU-B as the SEI-handler
running on CPU-A may find and process the second set of CPER records. CPU-B then
gets a spurious notification.

Why is this a problem? KVM needs to know if APEI handled the error, or whether
the Synchronous-External-Abort/SError-Interrupt was due to something else, in
which case we invoke todays default behaviour, which isn't appropriate for a RAS
event.


Thanks,

James
--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux IBM ACPI]     [Linux Power Management]     [Linux Kernel]     [Linux Laptop]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Video 4 Linux]     [Device Mapper]     [Linux Resources]

  Powered by Linux