Re: [Xen-users] Vif:s stop working when USB sound is played (win7 HVM, possibly GPLPV related)

[Andreas Falck <falck.andreas.lists@xxxxxxxxx>]

Of course, thanks, I never thought of checking the interrupts. 

From the respective "resources" tabs in device manager:

Xen PCI device driver: IRQ 28
Texas I. XHCI controller: IRQ -2

The other GPLPV devices (including the vif) does not show any resources, is this correct?

Also, I'm not sure how to interpret the -2 above. An artifact of decimal conversion or does win7 have problems with high IRQ numbers? If it gets mapped onto something else maybe it could collide undetected (the machine is dual-cpu amd).

Regards,
Andreas

2012/12/15 James Harper <james.harper@xxxxxxxxxxxxxxxx>

>
> Dear list members,
>
> I recently re-encountered a problem which I thought I had solved before, but
> the former solution turned out non-replicable.
>
> System: xen4.1 + gentoo 3.2.12, win7 as HVM guest with a radeon video card
> and a Texas instruments xhci (usb3) controller passed through xl toolstack
> GPLPV 0.11.0.356 drivers installed in guest, _except_ XenUsb Creative usb
> headset connected to the (passed-through) USB controller, together with
> keyboard and mouse
>
> Symptom: whenever sound is played via the USB headset, network
> connection disappears entirely. Connection returns immediately when
> playback stops, though.
>
> This occurs in a fresh win7 HVM installation. However, in an earlier almost
> identical installation I had the same problem, after installing all the GPLPV
> drivers (including XenUsb). Back then, the problem disappeared after
> removing the XenUsb driver, leading me to assume that XenUsb was source
> of the problem. But apparently this is not the explanation, since the problem
> shows up today even without the XenUsb driver. I can still boot up the old
> HVM system in which sound and networking works, the driver configs are
> very similar as far as I can see.
>
> What I have NOT tested:
> I have not managed to remove the XenNet driver - trying that gave me a
> bluescreen followed by system restore at reboot. I could reinstall, but
> XenNet and USB audio have successfully co-existed before.
> I have not tried any non-USB audio devices - none are available to me I have
> not tried installing and then removing XenUsb - I don't see what it could
> possibly change
>
> It is possible that I did something else at the same time as removing the
> XenUsb driver last time, confounding the explanation. Since I haven't tried
> without GPLPV, i cannot be sure that it is related to GPLPV at all. In both
> installs, I configured GPLPV before trying sound. So that suspicion might be
> misdirected. Any thoughts?
>

Can you see in device manager what interrupt the USB and GPLPV are using?

James

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