Verified by running the following parameter_defaults:
parameter_defaults:
ComputeExtraConfig:
nova::compute::libvirt::libvirt_cpu_mode: 'custom'
nova::compute::libvirt::libvirt_cpu_model: 'Haswell'
nova::compute::libvirt::libvirt_cpu_model_extra_flags: 'PCID, pdpe1gb'
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2018:3789