Re: [Xen-devel] Regression PCI passthrough from 4.5.5 to 4.6.0-rc1

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 14.08.17 at 13:31, <hfp@xxxxxxxxx> wrote:
> On Mon, 31 Jul 2017 12:12:45 +0200, Jan Beulich <jbeulich@xxxxxxxx> wrote:
>>>>> "Andreas Kinzler" <ml-ak@xxxxxx> 07/17/17 6:32 PM >>>
>>>>> Jan, I still have access to the hardware so perhaps we can finally  
>>>>> solve
>>>>> this problem.
>>>> Feel free to go ahead; I'll be on vacation for the next three weeks.
>>> Perhaps we can shortcut debugging a bit because I looked through the
>>> patches of XenServer 7.2 and found the attached patch. Now I tried it  
>>> and
>>> it seems to solve all the problems. Does that patch look good to you,  
>>> too?
>> Iirc the patch had even been submitted once, and rejected as being not
>> generally correct (i.e. it cures a symptom rather than the cause). What
>> we'd need to know is the order of actions the guest takes which ought to
>> result in the vector getting unmasked, but doesn't in reality.
> 
> I defined XEN_PT_LOGGING_ENABLED in xen_pt.h as requested without the  
> "hack" patch. Log is attached. Does it help?

It tells me that there's nothing unexpected on that side. As I think I
had indicated before, we really need to see both sides (qemu and
hypervisor), as part of the MSI-X handling lives in Xen. And for the
hypervisor side it is unlikely that we'll be able to get away without
a debugging patch. I am intending to make such available to you in
case you can't do so yourself, but I can't currently predict when I'll
get to it.

Jan


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