Comment 14 for bug 1851552

For your Openstack deployment, are you running on baremetal?
Are you deploying something like devstack or triple-o which enable nested virtualization?

https://docs.openstack.org/devstack/latest/guides/devstack-with-nested-kvm.html
https://docs.openstack.org/tripleo-quickstart/latest/unprivileged.html
https://tripleo-docs.readthedocs.io/en/latest/environments/virtual.html