Re: [Xen-devel] IOMMU fault with IGD passthrough setup on XEN 4.8.0

["G.R." <firemeteor@xxxxxxxxxxxxxxxxxxxxx>]

On Wed, Feb 8, 2017 at 11:59 PM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>>> On 08.02.17 at 15:56, <firemeteor@xxxxxxxxxxxxxxxxxxxxx> wrote:
>> On Wed, Feb 8, 2017 at 10:29 PM, G.R. <firemeteor@xxxxxxxxxxxxxxxxxxxxx> 
>> wrote:
>>> On Wed, Feb 8, 2017 at 8:44 PM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>>>>>> On 07.02.17 at 16:44, <firemeteor@xxxxxxxxxxxxxxxxxxxxx> wrote:
>>>>> On Mon, Feb 6, 2017 at 8:40 PM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>>>>>>>> On 05.02.17 at 06:51, <firemeteor@xxxxxxxxxxxxxxxxxxxxx> wrote:
>>>>>>> I finally get some spare time to collect the debug info.
>>>>>>
>>>>>> As I continue to be puzzled, best I could come up with is an
>>>>>> extension to the debug patch. Please use the attached one
>>>>>> in place of the earlier one, ideally on top of
>>>>>> https://lists.xenproject.org/archives/html/xen-devel/2017-02/msg00448.html
>>>>>> to reduce the overall amount of output (and help readability).
>>>>>
>>>>> Please see attached...
>>>>
>>>> So can you please give
>>>> https://lists.xenproject.org/archives/html/xen-devel/2017-02/msg00602.html
>>>> a try?
>>>>
>>> Hmm, it does not help.
>>> But I'll need to double check if I was misleading you.
>>> I used attempt dom0pvh=1 but it was too unstable and I was only able
>>> to disable it through hacking grub.cfg through sshfs remotely.
>>> I forgot to touch the /etc/default/grub so the dom0pvh=1 may have come
>>> back when I was generating the log yesterday.
>>>
>>> Going to do it once again now.
>>
>> It appears that dom0pvh or not does not affect the debug output
>> without Roger's patch.
>> Anyway, attaching the output for you to double check.
>
> Well, if this indeed was with his patch in place, then I'm puzzled.
> I'd have to further extend the debugging patch then, but this may
> take a few days to get to.

Please hold-off and let me double check for you. I'm also confused by
my current situation right now.
I think should be running without Roger's fix with dom0pvh=0.
But I happen to see a lot of fault message right now, from dom0.
Maybe I forgot to reboot last night after reverting back.
I'll build with Roger's fix again and do the experiment once more.
BTW -- I think that fix should not be conflicting with your debug change, right?

Thanks,
Rui

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