[libvirt] [PATCH 15/18] qemu: Support input model=virtio-{non-}transitional

[Daniel P. Berrangé]

On Mon, Jan 28, 2019 at 05:17:38PM +0100, Andrea Bolognani wrote:
> On Thu, 2019-01-24 at 12:05 -0500, Cole Robinson wrote:

> > * libvirt downgrade issues. Previous times we added new output, like
> > input type=keyboard, there were lots of complaints like: I upgraded
> > libvirt via virt-preview to see if it fixed a bug, type=keyboard was
> > added by default, I downgraded libvirt back to regular distro version,
> > my VM disappeared, because the XML parser choked on unknown
> > type=keyboard. Again in this particular case it likely won't cause those
> > issues because model= is new everywhere, but the pattern basically can't
> > be extended forward beyond this one instance.
> 
> People who install from virt-preview are going to be either
> developers, who should have no problem dealing with the situation,
> or users that are being guided through the analysis process in the
> first place, so they won't be on their own when guests disappear.

NB, downgrading of libvirt is explicitly unsupported. You might
get lucky and have it work between some versions, but this is
not something we ever care about guaranteeing.

Regards,
Daniel
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