Re: [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts

[Gleb Natapov]

On Sun, Nov 22, 2009 at 08:17:46PM -0600, Anthony Liguori wrote:
> Paolo Bonzini wrote:
> >
> >>I don't see how this fixes anything. If you used feature bits, how do
> >>you migrate from a version that has a feature bit that an older version
> >>doesn't know about? Do you just ignore it?
> >
> >I'd go with chunk instead of feature bits, specifying them like in
> >the PNG specification:
> 
> You mean, each device would have multiple sections?  We already use
> chunks for each device state.
> 
Each device can send device info in multiple formats (each format with
its own ID) and destination will choose the one it supports.

--
                        Gleb.