It is "just" the size that breaks it, as soon as I append a bunch of zero's to 
the source of the migration it will allocate 0x8000 as well and work  to 
migrate then.
 $ truncate --size=272384 /usr/lib/ipxe/qemu/efi-virtio.rom

Unfortunately this isn't much of a "solution" as:
- it needs to be (re-)started on the source to pick up the new size
- it would need to be back SRU'ed to about everywhere

I wonder if there is a better way.
Know about the change and adapt the Ubuntu machine types so that it increases 
the size on incoming migration maybe?

This was tried long ago in other bugs but failed, yet maybe today the SW stack 
is ready to do so.
I think I have to reach out to qmeu-devel to clarify if there is a way these 
days.

References to same/similar issues:
- https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1536331
- https://lists.gnu.org/archive/html/qemu-devel/2016-01/msg01881.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1293566
- https://bugzilla.redhat.com/show_bug.cgi?id=1090093
- https://forge.univention.org/bugzilla/show_bug.cgi?id=38877

** Bug watch added: Red Hat Bugzilla #1293566
   https://bugzilla.redhat.com/show_bug.cgi?id=1293566

** Bug watch added: Red Hat Bugzilla #1090093
   https://bugzilla.redhat.com/show_bug.cgi?id=1090093

** Bug watch added: forge.univention.org/bugzilla/ #38877
   https://forge.univention.org/bugzilla/show_bug.cgi?id=38877

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https://bugs.launchpad.net/bugs/1713490

Title:
  error migrating blocked on virtio-net-pci.rom

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