When requesting a shutdown of a VM via the client, the method used by the client is shutdown() which triggers an ACPI power button press event for the VM. This method does not change it's behavior if the VM is already in the "Powering Off" state.

For a misbehaving / misconfigured VM, sending the ACPI event multiple times does nothing. The VM must be forced off, either by calling the stop() method via the API, or via the oVirt WebUI. The client continues to call shutdown() in this case.

The client should recognize a VM in the powering off state and allow the user to force off the VM by calling the stop() method. Preferably, the option to force off a VM should be directly accessible to the user.