Add metadef value for stateless firmware

Add the new hw_firmware_stateless image property, which is now used to
request launching instances with stateless firmware in nova.

Depends-on: https://review.opendev.org/c/openstack/nova/+/908890
Change-Id: I24868b89bc79eda5657a6e2a5e98fb8fa150b1f3

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

@@ -431,6 +431,14 @@ Here is a list of useful image properties and the values they expect.
   * ``bios``
   * ``uefi``
 
+``hw_firmware_stateless``
+  :Type: bool
+
+  Specifies whether the image should be booted with stateless firmware.
+  If true, firmware configurations do not persist over server reboot.
+
+  Only supported by the libvirt driver. Also UEFI firmware is required.
+
 ``hw_mem_encryption``
   :Type: bool
 

etc/metadefs/compute-libvirt-image.json

@@ -51,6 +51,11 @@
                 "uefi"
             ]
         },
+        "hw_firmware_stateless": {
+            "title": "Stateless Firmware",
+            "description": "Specifies whether the image should be booted with only read-only firmware image. If true, firmware configurations do not persist over server reboot. Note stateless firmware is only supported when UEFI is used.",
+            "type": "boolean"
+        },
         "hw_rng_model": {
             "title": "Random Number Generator Device",
             "description": "Adds a random-number generator device to the image's instances. The cloud administrator can enable and control device behavior by configuring the instance's flavor. By default: The generator device is disabled. /dev/random is used as the default entropy source. To specify a physical HW RNG device, use the following option in the nova.conf file: rng_dev_path=/dev/hwrng",

glance/tests/functional/db/base_metadef.py

@@ -793,7 +793,7 @@ class MetadefLoadUnloadTests:
         'OS::Compute::VMwareFlavor': 2,
         'OS::Compute::TPM': 1,
         'OS::Compute::GuestMemoryBacking': 1,
-        'OS::Compute::LibvirtImage': 16,
+        'OS::Compute::LibvirtImage': 17,
         'OS::Compute::VMware': 6,
         'OS::Compute::Watchdog': 1,
     }

releasenotes/notes/dalmatian-metadef-changes-272f78e019a15ff1.yaml

@@ -0,0 +1,12 @@
+---
+upgrade:
+  - |
+    The following metadata definitions have been modified in the Dalmatian
+    release:
+
+    * Added ``hw_firmware_stateless`` boolean in
+      the ``OS::Compute::LibvirtImage`` namespace.
+
+    You may upgrade these definitions using:
+
+    ``glance-manage db load_metadefs [--path <path>] [--merge] [--prefer_new]``