Re: [Xen-devel] Issue about domU missing interrupt

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

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