Re: [Xen-devel] panic("queue invalidate wait descriptor was not executed\n")

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 12.05.16 at 14:36, <Kelly.Zytaruk@xxxxxxx> wrote:
>> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
>> Sent: Thursday, May 12, 2016 5:49 AM
>> >>> On 11.05.16 at 15:51, <Kelly.Zytaruk@xxxxxxx> wrote:
>> > During Xen boot I am seeing the panic in the subject line from
>> > .../xen/drivers/passthrough/vgt/qinval.c
>> 
>> And this is with current staging, or some much older version of Xen?
>> (ISTR some issue with the invalidation request getting sent to the wrong
>> IOMMU, leading to a timeout.)
> 
> No this is not current Xen, it is with 4.2.
> 
> Can you tell me more about the invalidation request getting sent to the 
> wrong IOMMU problem and approximately when it was fixed?  If you could 
> identify the patch I could back port it into my copy of Xen for testing.

Note that 4.2.5 has said change, and also note that you could have
done exactly what I have done now - go through the list of commits
altering files in the vtd/ subtree. This is what I've been remembering:
http://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=84c340ba4c3eb99278b6ba885616bb183b88ad67

Jan


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