[libvirt] [PATCH] qemu: ensure default machine types don't change if QEMU changes

[Andrea Bolognani]

On Tue, 2018-08-07 at 15:28 +0100, Daniel P. Berrangé wrote:
> On Tue, Aug 07, 2018 at 03:54:06PM +0200, Andrea Bolognani wrote:
> > I wonder if we shouldn't just drop the default machine type handling
> > altogether at this point, though.
> 
> That's impossible as it violates the back compatibility guarantee
> and will certainly break applications

In abstract terms, given that the whole point of this exercise is
shielding our users from changes in QEMU, why wouldn't we go the
whole way and take QEMU defaults out of the picture entirely?

I just can't picture a scenario where ignoring the QEMU defaults
would actually cause issues, since we're basically moving the
defaults into libvirt with this commit... Can you describe such
a scenario?

-- 
Andrea Bolognani / Red Hat / Virtualization