Re: [Xen-devel] Xen4.2 S3 regression?

[Ben Guthro <ben@xxxxxxxxxx>]

I'll continue to investigate, as my schedule allows, but haven't found
any smoking gun just yet.

This happens to be on an Ivybridge system - I have other Sandybridge
systems that will go to sleep, but never wake up at all, forcing a
hard power cycle.

I tested these iommu= parameters on one of these machines, to no
effect. Every time they go into S3, a hard reset is necessary to get
them to come out of it.




On Fri, Aug 10, 2012 at 2:50 AM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>>> On 09.08.12 at 18:09, Ben Guthro <ben@xxxxxxxxxx> wrote:
>> iommu=no-intremap
>> This seems to work around the issue on this platform, performing
>> multiple suspend/resume cycles, and ahci came back afterwards just
>> fine.
>>
>> What is the downside to flipping this off?
>
> Loss of security (against misbehaving/malicious guests). So we
> certainly want/need to get to the bottom of this (especially if
> this is not only one kind of system that's affected).
>
>> iommu=off
>> This test behaved similarly to the above, also working around the issue.
>
> Of course, this is a superset of the former.
>
> This result, however, makes it more likely again to indeed be a
> Xen side problem, not Dom0 induced corruption.
>
> Jan
>

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