Hi,
scsi-cd is new in 0.15, older versions have scsi-disk only. That's why we should take the occasion to add the empty vmstate at least to it.
Ok, good opportunity in that specific case.
For other devices, it's better to make the breakage in a single version. It also allows to make 0.15 the "flag day" where each device shall have a VMState or the entire VM will not be migratable.
Not that easy given that we didn't fully migrate to vmstate yet, otherwise we could simply fail migration in case we find any device with qdev->vmsd == NULL.
If desired, in the future we can revert this behavior for pc-0.14 and earlier machines.
And I'm still looking for a sane way to handle *this*. cheers, Gerd
