On 25/04/2018 16:29, Michael S. Tsirkin wrote:
>> Unfortunately this doesn't work as mentioned earlier. Virtio live
>> migration assumes that features are safe if you have them on the
>> destination but not on the source; this feature however works the
>> opposite way.
>
> That's a qemu code property, and it's because it does not
> migrate host properties right now. When implementing this feature we
> can add migration of host features.
You don't even need to migrate host features; it's just that guest
feature negotiation is repeated on the destination, and live migration
reports an error if the negotiation fails. The guest feature
negotiation is complicated a little bit by this feature, but I guess it
can work...
Paolo
