On Wed, Nov 25, 2009 at 10:30:47AM +0100, Juan Quintela wrote: > "Michael S. Tsirkin" <m...@redhat.com> wrote: > > On Tue, Nov 24, 2009 at 03:21:34PM +0100, Juan Quintela wrote: > > > A device already supports load for a range > > of versions between X and Y. We want to support > > saving to a range of versions. > > > > Which versions to use is a separate decision > > which should be taken on run time, not > > at startup time. > > Not in the general case.
If that means "not in all cases", I agree. But it seems pretty common for bugfixes. > Think that v8 brings featureX to one device. If you _know_ that you don't > want to use feature X, startup time is the proper place. Important > thing is not the savevm format (we can do any change here), what we > really need is that the guest still runs on the destination, and for > that you can't change the hardware too much. > > Later, Juan. I think it's clear: if you change guest visible properties these are features that might belong in machine description. If not - they don't belong in machine description. -- MST
