[rdo-dev] qemu-kvm vs qemu-kvm-rhev requirement

[Roman Kagan]

On Tue, Jun 05, 2018 at 10:26:54AM +0200, Kashyap Chamarthy wrote:
> On Mon, Jun 04, 2018 at 09:41:07PM +0300, Roman Kagan wrote:
> > Not so long ago openstack-nova started to require qemu-kvm-rhev instead
> > of qemu-kvm.
> > 
> > This made it impossible to install on Virtuozzo, which used to work well
> > before the change.
> 
> I think Virtuozzo is based on CentOS.

Right, to a large extent.  However, our QEMU package is much closer to
qemu-kvm-rhev than to CentOS' qemu-kvm.  It's still different from
qemu-kvm-rhev in some respects so we don't feel comfortable providing
"qemu-kvm-rhev" in our package.

> > I skimmed through the related tickets
> > 
> > https://bugzilla.redhat.com/show_bug.cgi?id=1367696
> > https://review.rdoproject.org/r/1900
> > https://bugzilla.redhat.com/show_bug.cgi?id=1392820
> > https://review.rdoproject.org/r/9858
> > 
> > but failed to understand the motivation behind this change.  What are
> > those particular features that are only present in qemu-kvm-rhev and
> > make the vendor-neutral requirement insufficient?  So far we didn't
> > notice any issues running recent enough QEMU with Nova, but I guess this
> > must have changed.
> 
> Dan has already responded.  In short, 'qemu-kvm-rhev' is the recommended
> RPM for Red Hat OSP.

This is clear :)  I'm interested in a longer reply to "why", in order to
figure out how to correctly run Nova on top of Virtuozzo.

Thanks,
Roman.