Comment 14 for bug 1688496

An update to the quick fix proposed by Eduardo if the host is running on centos/rhel 7.3.
In the [libvirt] section of /etc/nova/nova.conf set hw_machine_type as follows:

hw_machine_type = x86_64=pc-i440fx-rhel7.2.0

It was tested and found to behave as expected.