Merge "add hw_pmu metadef"

doc/source/admin/useful-image-properties.rst

@@ -473,6 +473,11 @@ Here is a list of useful image properties and the values they expect.
        allows for flexibility in setting/overriding the default behavior as
        needed.
      - ``true`` or ``false``
+   * - libvirt API driver
+     - ``hw_pmu``
+     - Controls emulation of a virtual performance monitoring unit (vPMU) in the guest.
+       To reduce latency in realtime workloads disable the vPMU by setting hw_pmu=false.
+     - ``true`` or ``false``
    * - libvirt API driver
      - ``img_hide_hypervisor_id``
      - Some hypervisors add a signature to their guests.  While the presence

etc/metadefs/compute-libvirt-image.json

@@ -80,6 +80,12 @@
                 "virtio"
             ]
         },
+        "hw_pmu": {
+            "title": "Virtual Performance Monitoring Unit",
+            "description": "Controls emulation of a vPMU in the guest. To reduce latency in realtime workloads disable the vPMU by setting hw_pmu=false",
+            "type": "string",
+            "enum": ["true", "false"]
+        },
         "hw_qemu_guest_agent": {
             "title": "QEMU Guest Agent",
             "description": "This is a background process which helps management applications execute guest OS level commands. For example, freezing and thawing filesystems, entering suspend. However, guest agent (GA) is not bullet proof, and hostile guest OS can send spurious replies.",

releasenotes/notes/train-metadefs-changes-c4380754cdd13a19.yaml

@@ -4,6 +4,8 @@ upgrade:
     The following metadata definitions have been modified in the Train
     release:
 
+    * Added ``hw_pmu`` boolean in the ``OS::Compute::LibvirtImage`` namespace.
+
     * Added ``powervm`` to the ``hypervisor_type`` enumeration in the
       ``OS:::Compute::Hypervisor`` namespace.