Comment 5 for bug 1902654

The following minimal steps can be used to test:

$ cat > layout-test.xml << EOF
<domain type='kvm'>
  <name>layout-test</name>
  <memory unit='MiB'>256</memory>
  <vcpu placement='static'>1</vcpu>
  <os>
    <type arch='x86_64' machine='pc-i440fx-wily'>hvm</type>
    <boot dev='hd'/>
  </os>
  <devices>
    <emulator>/usr/bin/kvm-spice</emulator>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
    </memballoon>
  </devices>
</domain>
EOF
$ virsh define layout-test.xml
$ virsh start layout-test
$ virsh qemu-monitor-command layout-test --hmp info qtree | grep any_layout
            any_layout = false

With that you can easily get the result that used to be true on Xenial.

Xenial = true
Bionic = true
C/D no more available
Eoan = false
Focal = false