From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Zhang, Xiantao" <xiantao.zhang@intel.com>
Subject: Re: S3 crash with VTD Queue Invalidation enabled
Date: Fri, 7 Jun 2013 01:33:41 +0000
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To: Ben Guthro <ben.guthro@gmail.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>, "Zhang,
	Xiantao" <xiantao.zhang@intel.com>, Ben Guthro <ben@guthro.net>, Jan Beulich <JBeulich@suse.com>, xen-devel <xen-devel@lists.xen.org>
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> >>>>> 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