Re: [Xen-devel] S3 crash with VTD Queue Invalidation enabled

[Ben Guthro <ben.guthro@xxxxxxxxx>]

On Thu, Jun 6, 2013 at 9:33 PM, Zhang, Xiantao <xiantao.zhang@xxxxxxxxx> wrote:
>> >>>>> Booting with "i915.modeset=0 single" (to prevent both KMS, and Xorg) -
>> >>>>> it does not occur.
>> >>>>> So, that pretty much narrows it down to the IGD, in my mind.
>> >>>>
>> >>>> Indeed, I agree. Yet I can't in any way comment on what or why.
>> >>>> Xiantao (perhaps some graphics person would good to be Cc-ed
>> >>>> here too)?
>> >>> Hi, Jan/Ben
>> >>> Thanks for your analysis! Could you try to enable  "snb_igd_quirk"  to 
>> >>> have
>> a
>> >> try ?  thanks!
>> >>> Xiantao
>> >>
>> >>
>> >> Thanks for your reply. I tried this param yesterday, but it did not
>> >> change the behavior.
>> > Okay, I recalled one bug in IGD i915 driver is found recently, and it may 
>> > bring
>> some errors  to VT-d,  and should be fixed in latest kernel.  Could you try 
>> latest
>> kernel 3.9.4 or 3.10-rcx ?
>> > Xiantao
>>
>> It may have been dropped off of the top of this thread, but i sent out
>> what i have tested with, and this was one of them.
>>
>> Testing 3.10 did not change this behavior.
>>
>> Did you have a particular changeset in mind?
> I will try to find it out, and I am wondering whether your code base includes 
> this quirk ? See: http://www.gossamer-threads.com/lists/xen/devel/275623
> Xiantao

Yes, it does.

I've worked around the issue, for now by disabling queue invalidation
for SNB systems.

Not ideal...but better than crashing

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