Public bug reported:

>From Zesty to Artful

# virsh migrate --live kvmguest-trusty-normal qemu+ssh://10.22.69.90/system
error: internal error: qemu unexpectedly closed the monitor: 
2017-08-28T13:03:01.352604Z qemu-system-x86_64: -chardev pty,id=charserial0: 
char device redirected to /dev/pts/0 (label charserial0)
2017-08-28T13:03:01.390972Z qemu-system-x86_64: warning: Unknown firmware file 
in legacy mode: etc/msr_feature_control
2017-08-28T13:03:01.435414Z qemu-system-x86_64: Length mismatch: 
0000:00:03.0/virtio-net-pci.rom: 0x40000 in != 0x80000: Invalid argument
2017-08-28T13:03:01.435429Z qemu-system-x86_64: error while loading state for 
instance 0x0 of device 'ram'
2017-08-28T13:03:01.435551Z qemu-system-x86_64: load of migration failed: 
Invalid argument

Worked before merging a newer ipxe, so the current assumption is that
the rom changed and we need some quirk to handle the forward migration
through the releases.

Solution might be in qemu/ipxe/libvirt therefore three bug tasks.

** Affects: ipxe (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: libvirt (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: qemu (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: libvirt (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: ipxe (Ubuntu)
   Importance: Undecided
       Status: New

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

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

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