Dr. David Alan Gilbert, on mar. 28 févr. 2017 17:00:17 +0000, wrote: > * Samuel Thibault (samuel.thiba...@gnu.org) wrote: > > Dr. David Alan Gilbert, on mar. 28 févr. 2017 16:54:46 +0000, wrote: > > > I'm thinking one way to do it without changing the version would > > > be to use the existing value for IPv4, and on reading allow any other > > > value for IPv6 (or just the ones we know about); that would make > > > it inwards migration compatible. > > > > Right. I don't know if that's enough for QEMU requirements. > > If you change the version number you break backwards migration anyway; > but doing what I suggested would keep backwards working in most cases.
Sure, but in some cases we're breaking upward compatibility *silently*. Samuel
