Re: [Qemu-devel] [RFC PATCH v2 00/16] visitor+BER migration format

[Michael S. Tsirkin]

On Tue, May 06, 2014 at 07:58:07PM +0100, Dr. David Alan Gilbert wrote:
> * Markus Armbruster (address@hidden) wrote:
> > "Michael S. Tsirkin" <address@hidden> writes:
> 
> <snip>
> 
> > > OK but for a new machine type, let's default to BER, right?
> > > I see no reason to keep supporting when non-BER when -M specifies 2.1
> > > compatibility, do you?
> > 
> > I fail to see the relation between machine type and migration's wire
> > encoding.
> 
> New machine types are a useful but not definitive line in the sand.  If
> you enable something/change the default on a new machine type you know
> it won't break any existing users since there aren't any.
> 
> Dve

Exactly. And on the other hand, someone enabling old machine type
and doing live migration is likely to want to be compatible with old
qemu wrt migration.

> --
> Dr. David Alan Gilbert / address@hidden / Manchester, UK