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Re: [Xen-devel] [PATCH] xen: Add fake_s3 command-line option for testing


  • To: Jan Beulich <JBeulich@xxxxxxxx>
  • From: George Dunlap <george.dunlap@xxxxxxxxxx>
  • Date: Tue, 22 May 2018 14:21:22 +0100
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  • Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Marek Marczykowski <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxx>
  • Delivery-date: Tue, 22 May 2018 13:21:34 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 05/22/2018 12:44 PM, Jan Beulich wrote:
>>>> On 22.05.18 at 13:21, <george.dunlap@xxxxxxxxxx> wrote:
>> On 05/22/2018 11:51 AM, Jan Beulich wrote:
>>>>>> On 21.05.18 at 16:16, <george.dunlap@xxxxxxxxxx> wrote:
>>>> Most server-class hardware doesn't support ACPI S3 suspend;
>>>
>>> Is that really the case? I though S3 was pretty "normal" these days.
>>>
>>>> but most bugs we'll run across won't need actual S3 to trigger.
>>>
>>> Not sure about this one either: In particular the microcode issue
>>> addressed recently does require actual S3 to surface. I'm not
>>> meaning to put under question the usefulness of this option,
>>> though. I'd just like the description to not lead to people drawing
>>> wrong conclusions.
>>
>> Re S3 support, I was just repeating what I'd heard.  My judgement is
>> still that "most" bugs we end up encountering will be on the Xen side;
>> but I'm happy to reword it to take out / moderate both implications.
> 
> Oh, surely issues normally are on the Xen side. It's just that there's a
> fair range of issues which still require actually going through S3 to
> show up - the ucode issues after XSA-254 are a good example thereof.

Well FWIW with acpi_power=s3_fake on staging+patch, the machine hangs
with default bti / xpti settings, and works with bti and xpti disabled.
So at least some part of XSA-254 issues can / would be caught without
having to actually enter real S3.

 -George

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