With a migration Bionic to Eoan with a balloon device I can confirm
this.
Guestconfig:
<memballoon model='virtio'>
<alias name='balloon0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06'
function='0x0'/>
</memballoon>
root@testkvm-bionic-from:~# virsh migrate --unsafe --live testguest
qemu+ssh://10.192.69.27/system
error: internal error: qemu unexpectedly closed the monitor:
2019-10-21T13:44:16.155100Z qemu-system-x86_64: warning: host doesn't support
requested feature: CPUID.80000001H:ECX.svm [bit 2]
2019-10-21T13:44:18.530641Z qemu-system-x86_64: get_pci_config_device: Bad
config data: i=0x10 read: e1 device: 1 cmask: ff wmask: c0 w1cmask:0
2019-10-21T13:44:18.530657Z qemu-system-x86_64: Failed to load PCIDevice:config
2019-10-21T13:44:18.530660Z qemu-system-x86_64: Failed to load
virtio-balloon:virtio
2019-10-21T13:44:18.530663Z qemu-system-x86_64: error while loading state for
instance 0x0 of device '0000:00:06.0/virtio-balloon'
2019-10-21T13:44:18.530839Z qemu-system-x86_64: load of migration failed:
Invalid argument
** Changed in: qemu (Ubuntu)
Status: New => Confirmed
** Changed in: qemu (Ubuntu)
Importance: Undecided => High
** Changed in: qemu (Ubuntu)
Assignee: (unassigned) => Christian Ehrhardt (paelzer)
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https://bugs.launchpad.net/bugs/1848497
Title:
virtio-balloon change breaks migration from qemu prior to 4.0
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