---
features:
  - |
    The libvirt driver has been extended to support user configurable
    performance monitoring unit (vPMU) virtualization.
    This is particularly useful for real-time workloads.
    A pair of boolean flavor extra spec and image metadata properties
    ``hw:pmu`` and ``hw_pmu`` have been added to control the emulation
    of the vPMU. By default the behavior of vPMU emulation has
    not been changed. To take advantage of this new feature, the operator
    or tenant will need to update their flavors or images to define the
    new property.