[libvirt] [Qemu-devel] [PATCH v2] vhost-user: define conventions for vhost-user backends

[Hoffmann, Gerd]

On Sat, Oct 06, 2018 at 02:32:45AM +0400, Marc-André Lureau wrote:
> Hi
> 
> On Fri, Oct 5, 2018 at 7:59 PM Hoffmann, Gerd <kraxel at redhat.com> wrote:
> >
> >   Hi,
> >
> > > For example, "virgl" support may not be implemented. This
> > > --print-capabilities is a simple way to check what the backend
> > > implements.
> >
> > What is the expected behavior in case virgl is implemented by the
> > backend, but not available (due to lack of 3d hardware in the host for
> > example) ?
> 
> I would say either it fails at runtime, or the backend doesn't announce it.
> 
> Would you want something else?

Yes, one of the two, but we should clarify which one.

I suspect "fail at runtime" is easier for libvirt, given that it libvirt
must handle backend failures anyway ...

cheers,
  Gerd