Quoting Dr. David Alan Gilbert (dgilb...@redhat.com): > * Serge E. Hallyn (se...@hallyn.com) wrote: > > > Although, some people are using newer qemu with '-M pc-1.0'. So we'd be > > stopping thing from migrating to support the people coming from qemu-kvm. > > Hmm. > > What sometimes happens is that you create a VM (lets say with virt-manager) > on an old installation, and it has the XML file for that VM which I think > includes the machine type. You upgrade your host or copy your VMs over > and so you still use the old machine definition, and hence still have the > -M pc-1.0
Right, but so long as it is a shutdown vm image, it shouldn't matter to this case whether qemu 1.7 uses the old qemu-kvm cirrus vga ram size, or the qemu ram size, right? > Some people have snapshots rather than just disk images taken with particular > versions and they expect those to be reloadable into newer versions. Disk snapshots should be fine right? Live snapshots no, but then I didn't they were actually very well supported anyway. In any case, they point would remain that if x% of people have snapshots from qemu-kvm, and the rest have snapshots created using qemu but older machine types, then whether or not we change the values, either way the other x% or 100-x % will not be able to restore... So still it seems the only sure way to handle this would be for qemu to say "old vram size != new vram size; so let me resize the vram". -serge
