device: 0.921
graphic: 0.873
other: 0.712
mistranslation: 0.694
instruction: 0.549
semantic: 0.511
vnc: 0.429
socket: 0.362
boot: 0.275
network: 0.249
assembly: 0.168
KVM: 0.098

change and eject commands are not working on an overlay

From qemu monitor, 'change' and 'eject' commands are not working on a CD overlay.
'info block' returns:
  cd0-overlay0: /home/guillaume/test/cd0-overlay0 (qcow2)
    Attached to:      cd0-device
    Removable device: not locked, tray closed
    Cache mode:       writeback, ignore flushes
    Backing file:     /home/guillaume/test.iso (chain depth: 1)

But 'eject cd0-overlay0' returns:
  Device 'cd0-overlay0' not found
I also tried 'cd0-device' and 'cd0'.

Same problem with 'change' command.

Can you please provide your QEMU version, command line, and any QMP/HMP commands you issued, and the expected/desired effect?

[Expired for QEMU because there has been no activity for 60 days.]