Comment 5 for bug 1883009

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Christian Ehrhardt  (paelzer) wrote :

The trigger it needs is the virtio port being set up.
Do you have:
  /dev/virtio-ports/org.qemu.guest_agent.0
in your guest?

If not your guest definition will need it, for config examples see
  https://wiki.qemu.org/Features/GuestAgent
  https://wiki.libvirt.org/page/Qemu_guest_agent

If you have that /dev file then the service should have been started by the udev rule.