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From my understanding, You are looking to control the existing KVM hypervisors and its VMs through a new OpenStack setup.

If it is the case, Then the answer is NO. You can not control the existing VMs prior to Openstack installation.

OpenStack highly depends on its database. whenever the new VM is being created there are certain information about new VM created by OpenStack NOVA will be saved in the respective DB tables. OpenStack will manage those VMs using the available DB information.

In your case, all the KVM VMs created before the OpenStack controller installation has no info saved in the DB for the OpenStack to manage it.