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

[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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