When creating a VirtualMachine that references an InstanceType, the webhook currently rejects its creation if the InstanceType resource does not exist. The following error is shown:

"admission webhook "virtualmachine-validator.kubevirt.io" denied the request: Failure to find instancetype: controllerrevisions.apps "vm-cirros-datavolume-example-instancetype-v1beta1-786ad661-0a0b-4537-861b-be41feda3147-1" not found"

We should consider preventing VM start-up (VMI creation) when the associated InstanceType is missing. However, blocking the VM creation is overkill and goes against the declarative design we are aiming for.

4.18.0

Always

1.Create a VM that references a instance type in its spec.
2.Don't create instance type.
3.Create fails.

VM creation is rejected by webhook.

VM creation should succeed. If the instance type is created in the future, the VM should be recoverable.