Re: [PATCH kvm-unit-tests 5/5] add hyperv_connections test

["Radim Krčmář" <rkrcmar@redhat.com>]

2017-06-14 15:01+0300, Roman Kagan:
> On Tue, Jun 13, 2017 at 09:28:59PM +0200, Radim Krčmář wrote:
> > 2017-06-06 22:19+0300, Roman Kagan:
> > > Add a test for Hyper-V message and event connections.
> > > 
> > > It requires QEMU with the extended test device supporting message end
> > > event connection test modes (recently posted on qemu-devel).  On older
> > > QEMU versions it fails.
> > 
> > Doesn't QEMU provide a way to detect this feature from the outside (some
> > command line magic) that we could use it to skip the test?
> 
> I didn't know there was such a trick.  However, I failed to figure out
> how to get it to work here: the -device options appeared to be
> interpreted after -kernel so it didn't cause a SKIP;

Hm, the test should be skipped if QEMU fails to start.

>                                                      adding a dedicated
> toplevel command-line option would probably be an overkill.

Right, I assumed that QEMU wants to prevent migration to QEMU's that
don't support this feature (which usually implies a property), but it
seems that there are no real users to care about ...

The solution proposed by Paolo looks good.

Thanks.