[libvirt] [PATCH 3/6] qemu: explicitly disable audio if there is no sound device

[Daniel P. Berrange]

On Tue, Nov 21, 2017 at 01:02:05PM +0100, Peter Krempa wrote:
> On Tue, Nov 21, 2017 at 11:48:20 +0000, Daniel Berrange wrote:
> > On Tue, Nov 21, 2017 at 12:44:44PM +0100, Peter Krempa wrote:
> > > On Tue, Nov 21, 2017 at 11:24:06 +0000, Daniel Berrange wrote:
> > > > IOW, I don't think this patch is desirable.
> > > 
> > > We could allow hotplug only if qemu will allow to specify the sound
> > > output per-soundcard which would avoid this problem.
> > 
> > I agree that having ability to configure distinct outputs per sound card
> > might be useful, I don't think it is a blocking feature for hotplugging
> > sound cards. ie, there's no reason why a user should not be able to
> > unplug their current sound card, and plug in a new sound card for a
> > running guests - they would only ever have 1 sound card present at
> > a time in that scenario, so distinct outputs is not a requirement
> > for that usecase.
> 
> While not a requirement, mandating that new features are available only
> with new software sometimes saves a lot of headaches. I would not
> mind if sound device hotplug will be supported only when specific
> outputs can be selected when adding the sound card and would not work
> without that.
> 
> Unfortunately qemu does not yet support this and I don't think that they
> will any soon.

Agreed, and the most interesting thing for multiple audio cards is
probably multi-seat support, which wouldn't need choosing between
different backends, instead choosing different spice/vnc instances.

Basically, I think this patch should be dropped.

Regards,
Daniel
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