> If there are incompatibilities between kernel 4.4 and 4.15, would I maybe
> risk that then I cannot migrate 16.04 guests any longer? Did anyone tests
> this case?
>
This way around (old guest/ new host) I cover migration tests before any
qemu/libvirt upload testin x86/s390/ppc64el (and a tiny bit of arm64).
> If there are incompatibilities between kernel 4.4 and 4.15, would I maybe
> risk that then I cannot migrate 16.04 guests any longer? Did anyone tests
> this case?
>
This way around (old guest/ new host) I cover migration tests before any
qemu/libvirt upload testin x86/s390/ppc64el (and a tiny bit of arm64).