Re: Issue about domU missing interrupt

G.R.
Mon, 03 Dec 2012 13:14:55 -0000

On Mon, Dec 3, 2012 at 6:15 PM, Mats Petersson
<mats.petersson@citrix.com>wrote:

> On 03/12/12 03:47, G.R. wrote:
>
>> Hi developers,
>> I met some domU issues and the log suggests missing interrupt.
>> Details from here: http://www.gossamer-threads.**
>>
com/lists/xen/users/263938#**263938<http://www.gossamer-threads.com/lists/xen/users/263938#263938>
>> In summary, this is the suspicious log:
>>
>> (XEN) vmsi.c:122:d32767 Unsupported delivery mode 3
>>
>> I''ve checked the code in question and found that mode 3 is an
>> ''reserved_1'' mode.
>> I want to trace down the source of this mode setting to root-cause the
>> issue.
>> But I''m not an xen developer, and am even a newbie as a xen
user.
>> Could anybody give me instructions about how to enable detailed debug
log?
>> It could be better if I can get advice about experiments to perform /
>> switches to try out etc.
>>
>> My SW config:
>> dom0: Debian wheezy (3.6 experimental kernel, xen 4.1.3-4)
>> domU: Debian wheezy 3.2.x stock kernel.
>>
>> Thanks,
>> Timothy
>>
> Are you passing hardware (PCI Passthrough) to the HVM guest?
> What are the exact messages in the DomU?
>
>
Yes, I''m doing PCI passthrough (the IGD, audio && USB
controller).
But this is actually a PVHVM guest since debian stock kernel has PVOP
enabled.
And when I tried another PVOP disabled linux distro (openelec v2.0), I did
not see such msi related error message.
Actually, with that domU I do not see anything obvious wrong from the log,
but I also see nothing from panel (panel receive no signal and go
power-saving) :-(


Back to the issue I was reporting, the domU log looks like this:

Dec 2 21:52:44 debvm kernel: [ 1085.604071] [drm:i915_hangcheck_ring_idle]
*ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 3354, at
3354], missed IRQ?
Dec 2 21:56:50 debvm kernel: [ 1332.076071] [drm:i915_hangcheck_ring_idle]
*ERROR* Hangcheck timer elapsed... render ring idle [waiting on 11297, at
11297], missed IRQ?
Dec 2 22:32:48 debvm kernel: [ 7.220073] hda-intel: azx_get_response
timeout, switching to polling mode: last cmd=0x000f0000
Dec 2 22:45:32 debvm kernel: [ 776.392084] hda-intel: No response from
codec, disabling MSI: last cmd=0x002f0600
Dec 2 22:45:33 debvm kernel: [ 777.400075] hda_intel: azx_get_response
timeout, switching to single_cmd mode: last cmd=0x002f0600


Thanks,
Timothy


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