Re: [Qemu-devel] [PATCH] q35: Remove old machine versions

[Michael S. Tsirkin]

On Wed, Aug 19, 2015 at 09:30:20AM -0700, Eduardo Habkost wrote:
> On Wed, Aug 19, 2015 at 10:55:26AM +0100, Dr. David Alan Gilbert wrote:
> > * Eduardo Habkost (address@hidden) wrote:
> > > Migration with q35 was not possible before commit
> > > 04329029a8c539eb5f75dcb6d8b016f0c53a031a, because q35 unconditionally 
> > > creates
> > > an ich9-ahci device, that was marked as unmigratable. So all q35 machines
> > > before pc-q35-2.4 were unmigratable, and there's no point in keeping
> > > compatibility code for them.
> > > 
> > > Remove all old pc-q35 machine classes and keep only pc-q35-2.4.
> > 
> > But doesn't that mean that anyone who has a machine configured with one
> > of those machine types will suddenly find it wont start?
> 
> Yes, and they will have to update their configuration to use pc-q35-2.4
> or newer.

That seems easily avoidable: just make pc-q35-X alias pc-q35-2.4 for X < 2.4.

> -- 
> Eduardo