From 619cd0a9c733125d8c2bac10c8b0b40e00bd2594 Mon Sep 17 00:00:00 2001
From: Callum Dickinson <callum.dickinson@catalystcloud.nz>
Date: Fri, 28 Feb 2025 13:43:54 +1300
Subject: [PATCH] Add more flavor metadata to libvirt guest XML

This change adds the the following new information to the existing
flavor metadata structure in the libvirt guest XML:

* Flavor ID
* Extra specs

Downstream clients that query this guest XML such as Ceilometer
may also require this information. If it's not defined in this
metadata, clients are forced to perform a Nova API query just
to fetch this additional information.

This change should almost eliminate the need to perform such
API queries.

Signed-off-by: Callum Dickinson <callum.dickinson@catalystcloud.nz>
Implements: blueprint xml-image-meta
Change-Id: I249bc117a796f28e9929e12707a5afb6c869eb89
---
 nova/tests/unit/virt/ironic/utils.py          |  3 +
 nova/tests/unit/virt/libvirt/test_config.py   | 93 ++++++++++++++++++-
 nova/tests/unit/virt/libvirt/test_driver.py   | 75 +++++++++++----
 nova/virt/driver.py                           |  2 +
 nova/virt/libvirt/config.py                   | 25 +++++
 nova/virt/libvirt/driver.py                   |  2 +
 .../bp-xml-image-meta-037f4eba59f0121e.yaml   | 15 +++
 7 files changed, 197 insertions(+), 18 deletions(-)
 create mode 100644 releasenotes/notes/bp-xml-image-meta-037f4eba59f0121e.yaml

diff --git a/nova/tests/unit/virt/ironic/utils.py b/nova/tests/unit/virt/ironic/utils.py
index 185cbbf173..a521635197 100644
--- a/nova/tests/unit/virt/ironic/utils.py
+++ b/nova/tests/unit/virt/ironic/utils.py
@@ -31,6 +31,7 @@ TEST_IMAGE_UUID = "cccccccc-cccc-cccc-cccc-cccccccccccc"
 TEST_IMAGE_NAME = "test-image"
 TEST_FLAVOR_ID = 1
 TEST_FLAVOR_NAME = "fake.flavor"
+TEST_FLAVOR_FLAVORID = "iiiiiiii-iiii-iiii-iiii-iiiiiiiiiiii"
 TEST_FLAVOR_EXTRA_SPECS = {
     'baremetal:deploy_kernel_id': 'aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa',
     'baremetal:deploy_ramdisk_id': 'bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb'}
@@ -226,6 +227,8 @@ def get_test_instance_driver_metadata(**kw):
                                           properties={})
     default_flavor_meta = driver.FlavorMeta(
                              name=kw.get('flavor_name', TEST_FLAVOR_NAME),
+                             flavorid=kw.get('flavor_flavorid',
+                                             TEST_FLAVOR_FLAVORID),
                              memory_mb=kw.get('flavor_memorymb',
                                               TEST_FLAVOR_MEMORYMB),
                              vcpus=kw.get('flavor_vcpus', TEST_FLAVOR_VCPUS),
diff --git a/nova/tests/unit/virt/libvirt/test_config.py b/nova/tests/unit/virt/libvirt/test_config.py
index 1d772f5432..90be09354e 100644
--- a/nova/tests/unit/virt/libvirt/test_config.py
+++ b/nova/tests/unit/virt/libvirt/test_config.py
@@ -4117,6 +4117,7 @@ class LibvirtConfigGuestMetadataNovaTest(LibvirtConfigBaseTest):
 
         flavor = config.LibvirtConfigGuestMetaNovaFlavor()
         flavor.name = "m1.lowgravity"
+        flavor.id = "f719a0dd-4b43-4efe-8336-48ef74099ad4"
         flavor.vcpus = 8
         flavor.memory = 2048
         flavor.swap = 10
@@ -4152,12 +4153,102 @@ class LibvirtConfigGuestMetadataNovaTest(LibvirtConfigBaseTest):
       <nova:package version="2014.2.3"/>
       <nova:name>moonbuggy</nova:name>
       <nova:creationTime>2009-02-13 23:31:30</nova:creationTime>
-      <nova:flavor name="m1.lowgravity">
+      <nova:flavor name="m1.lowgravity"
+        id="f719a0dd-4b43-4efe-8336-48ef74099ad4">
         <nova:memory>2048</nova:memory>
         <nova:disk>50</nova:disk>
         <nova:swap>10</nova:swap>
         <nova:ephemeral>10</nova:ephemeral>
         <nova:vcpus>8</nova:vcpus>
+        <nova:extraSpecs></nova:extraSpecs>
+      </nova:flavor>
+      <nova:owner>
+        <nova:user
+         uuid="3472c2a6-de91-4fb5-b618-42bc781ef670">buzz</nova:user>
+        <nova:project
+         uuid="f241e906-010e-4917-ae81-53f4fb8aa021">moonshot</nova:project>
+      </nova:owner>
+      <nova:root type="image" uuid="fe55c69a-8b2e-4bbc-811a-9ad2023a0426"/>
+      <nova:ports>
+        <nova:port uuid="567a4527-b0e4-4d0a-bcc2-71fda37897f7">
+          <nova:ip type="fixed" address="192.168.1.1" ipVersion="4"/>
+          <nova:ip type="fixed" address="fe80::f95c:b030:7094" ipVersion="6"/>
+          <nova:ip type="floating" address="11.22.33.44" ipVersion="4"/>
+        </nova:port>
+        <nova:port uuid="a3ca97e2-0cf9-4159-9bfc-afd55bc13ead">
+          <nova:ip type="fixed" address="10.0.0.1" ipVersion="4"/>
+          <nova:ip type="fixed" address="fdf8:f53b:82e4::52" ipVersion="6"/>
+          <nova:ip type="floating" address="1.2.3.4" ipVersion="4"/>
+        </nova:port>
+      </nova:ports>
+    </nova:instance>
+        """)
+
+    def test_config_metadata_flavor_extra_specs(self):
+        meta = config.LibvirtConfigGuestMetaNovaInstance()
+        meta.package = "2014.2.3"
+        meta.name = "moonbuggy"
+        meta.creationTime = 1234567890
+        meta.roottype = "image"
+        meta.rootid = "fe55c69a-8b2e-4bbc-811a-9ad2023a0426"
+
+        owner = config.LibvirtConfigGuestMetaNovaOwner()
+        owner.userid = "3472c2a6-de91-4fb5-b618-42bc781ef670"
+        owner.username = "buzz"
+        owner.projectid = "f241e906-010e-4917-ae81-53f4fb8aa021"
+        owner.projectname = "moonshot"
+
+        meta.owner = owner
+
+        flavor = config.LibvirtConfigGuestMetaNovaFlavor()
+        flavor.name = "m1.lowgravity"
+        flavor.id = "f719a0dd-4b43-4efe-8336-48ef74099ad4"
+        flavor.vcpus = 8
+        flavor.memory = 2048
+        flavor.swap = 10
+        flavor.disk = 50
+        flavor.ephemeral = 10
+        flavor.extra_specs = {"hw_rng:allowed": "true"}
+
+        meta.flavor = flavor
+
+        meta.ports = config.LibvirtConfigGuestMetaNovaPorts(
+            ports=[
+                config.LibvirtConfigGuestMetaNovaPort(
+                    '567a4527-b0e4-4d0a-bcc2-71fda37897f7',
+                    ips=[
+                        config.LibvirtConfigGuestMetaNovaIp(
+                            'fixed', '192.168.1.1', '4'),
+                        config.LibvirtConfigGuestMetaNovaIp(
+                            'fixed', 'fe80::f95c:b030:7094', '6'),
+                        config.LibvirtConfigGuestMetaNovaIp(
+                            'floating', '11.22.33.44', '4')]),
+                config.LibvirtConfigGuestMetaNovaPort(
+                    'a3ca97e2-0cf9-4159-9bfc-afd55bc13ead',
+                    ips=[
+                        config.LibvirtConfigGuestMetaNovaIp(
+                            'fixed', '10.0.0.1', '4'),
+                        config.LibvirtConfigGuestMetaNovaIp(
+                            'fixed', 'fdf8:f53b:82e4::52', '6'),
+                        config.LibvirtConfigGuestMetaNovaIp(
+                            'floating', '1.2.3.4', '4')])])
+
+        xml = meta.to_xml()
+        self.assertXmlEqual(xml, """
+    <nova:instance xmlns:nova='http://openstack.org/xmlns/libvirt/nova/1.1'>
+      <nova:package version="2014.2.3"/>
+      <nova:name>moonbuggy</nova:name>
+      <nova:creationTime>2009-02-13 23:31:30</nova:creationTime>
+      <nova:flavor name="m1.lowgravity"
+        id="f719a0dd-4b43-4efe-8336-48ef74099ad4">
+        <nova:memory>2048</nova:memory>
+        <nova:disk>50</nova:disk>
+        <nova:swap>10</nova:swap>
+        <nova:ephemeral>10</nova:ephemeral>
+        <nova:vcpus>8</nova:vcpus>
+        <nova:extraSpecs>
+          <nova:extraSpec name="hw_rng:allowed">true</nova:extraSpec>
+        </nova:extraSpecs>
       </nova:flavor>
       <nova:owner>
         <nova:user
diff --git a/nova/tests/unit/virt/libvirt/test_driver.py b/nova/tests/unit/virt/libvirt/test_driver.py
index cd876b32b4..5b84cba6db 100644
--- a/nova/tests/unit/virt/libvirt/test_driver.py
+++ b/nova/tests/unit/virt/libvirt/test_driver.py
@@ -2969,6 +2969,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
         flavor = objects.Flavor(
             id=1,
             name='m1.small',
+            flavorid='6a523f6f-5ede-4a3a-938b-1c3a5d665771',
             memory_mb=6,
             vcpus=28,
             root_gb=496,
@@ -3045,11 +3046,14 @@ class LibvirtConnTestCase(test.NoDBTestCase,
         self.assertIsInstance(
             cfg.metadata[0].flavor, vconfig.LibvirtConfigGuestMetaNovaFlavor)
         self.assertEqual("m1.small", cfg.metadata[0].flavor.name)
+        self.assertEqual("6a523f6f-5ede-4a3a-938b-1c3a5d665771",
+                         cfg.metadata[0].flavor.id)
         self.assertEqual(6, cfg.metadata[0].flavor.memory)
         self.assertEqual(28, cfg.metadata[0].flavor.vcpus)
         self.assertEqual(496, cfg.metadata[0].flavor.disk)
         self.assertEqual(8128, cfg.metadata[0].flavor.ephemeral)
         self.assertEqual(33550336, cfg.metadata[0].flavor.swap)
+        self.assertEqual({}, cfg.metadata[0].flavor.extra_specs)
 
         num_ports = 0
         for device in cfg.devices:
@@ -3094,7 +3098,8 @@ class LibvirtConnTestCase(test.NoDBTestCase,
             ephemeral_gb=8128,
             swap=33550336,
             extra_specs={},
-            id=42
+            id=42,
+            flavorid='someflavor',
         )
         instance_ref = objects.Instance(**test_instance)
         instance_ref.flavor = flavor
@@ -3250,7 +3255,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
         flavor = objects.Flavor(
             id=42, name='m1.small', memory_mb=6,
             vcpus=28, root_gb=496, ephemeral_gb=8128,
-            swap=33550336, extra_specs={})
+            swap=33550336, extra_specs={}, flavorid='someflavor')
         instance_ref = objects.Instance(**test_instance)
         instance_ref.flavor = flavor
         image_meta = objects.ImageMeta.from_dict(self.test_image_meta)
@@ -3423,7 +3428,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
         image_meta = objects.ImageMeta.from_dict(self.test_image_meta)
         flavor = objects.Flavor(memory_mb=1, vcpus=2, root_gb=496,
                                 ephemeral_gb=8128, swap=33550336, name='fake',
-                                extra_specs={}, id=42)
+                                extra_specs={}, id=42, flavorid='someflavor')
         instance_ref.flavor = flavor
 
         caps = vconfig.LibvirtConfigCaps()
@@ -3460,7 +3465,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
         flavor = objects.Flavor(
             id=42, memory_mb=4096, vcpus=4, root_gb=496,
             ephemeral_gb=8128, swap=33550336, name='fake',
-            extra_specs={})
+            extra_specs={}, flavorid='someflavor')
         instance_ref.flavor = flavor
 
         caps = vconfig.LibvirtConfigCaps()
@@ -3488,6 +3493,42 @@ class LibvirtConnTestCase(test.NoDBTestCase,
             self.assertIsNone(cfg.cputune)
             self.assertIsNone(cfg.cpu.numa)
 
+    def test_get_guest_config_flavor_extra_specs(self):
+        flavor = objects.Flavor(name='m1.small',
+                                flavorid=(
+                                    '6a523f6f-5ede-4a3a-938b-1c3a5d665771'),
+                                memory_mb=6,
+                                vcpus=28,
+                                root_gb=496,
+                                ephemeral_gb=8128,
+                                swap=33550336,
+                                extra_specs={"hw_rng:allowed": "true"})
+        instance_ref = objects.Instance(**self.test_instance)
+        instance_ref.flavor = flavor
+        image_meta = objects.ImageMeta.from_dict(self.test_image_meta)
+        drvr = libvirt_driver.LibvirtDriver(fake.FakeVirtAPI(), True)
+        cfg = drvr._get_guest_config(instance_ref,
+                                     _fake_network_info(self, 1),
+                                     image_meta, {'mapping': {}})
+        self.assertIsInstance(cfg.metadata[0].flavor,
+                              vconfig.LibvirtConfigGuestMetaNovaFlavor)
+        self.assertEqual("m1.small",
+                         cfg.metadata[0].flavor.name)
+        self.assertEqual("6a523f6f-5ede-4a3a-938b-1c3a5d665771",
+                         cfg.metadata[0].flavor.id)
+        self.assertEqual(6,
+                         cfg.metadata[0].flavor.memory)
+        self.assertEqual(28,
+                         cfg.metadata[0].flavor.vcpus)
+        self.assertEqual(496,
+                         cfg.metadata[0].flavor.disk)
+        self.assertEqual(8128,
+                         cfg.metadata[0].flavor.ephemeral)
+        self.assertEqual(33550336,
+                         cfg.metadata[0].flavor.swap)
+        self.assertEqual({"hw_rng:allowed": "true"},
+                         cfg.metadata[0].flavor.extra_specs)
+
     def _test_get_guest_memory_backing_config(
             self, host_topology, inst_topology, numatune):
         drvr = libvirt_driver.LibvirtDriver(fake.FakeVirtAPI(), True)
@@ -3796,7 +3837,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
         flavor = objects.Flavor(
             id=42, name='m1.small', memory_mb=6,
             vcpus=28, root_gb=496, ephemeral_gb=8128,
-            swap=33550336, extra_specs=extra_specs)
+            swap=33550336, extra_specs=extra_specs, flavorid='someflavor')
 
         instance_ref = objects.Instance(**self.test_instance)
         instance_ref.flavor = flavor
@@ -3898,7 +3939,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
         image_meta = objects.ImageMeta.from_dict(self.test_image_meta)
         flavor = objects.Flavor(memory_mb=1, vcpus=2, root_gb=496,
                                 ephemeral_gb=8128, swap=33550336, name='fake',
-                                extra_specs={}, id=42)
+                                extra_specs={}, id=42, flavorid='someflavor')
         instance_ref.flavor = flavor
 
         caps = vconfig.LibvirtConfigCaps()
@@ -3951,7 +3992,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
         image_meta = objects.ImageMeta.from_dict(self.test_image_meta)
         flavor = objects.Flavor(memory_mb=4096, vcpus=4, root_gb=496,
                                 ephemeral_gb=8128, swap=33550336, name='fake',
-                                extra_specs={}, id=42)
+                                extra_specs={}, id=42, flavorid='someflavor')
         instance_ref.flavor = flavor
 
         caps = vconfig.LibvirtConfigCaps()
@@ -4069,7 +4110,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
         image_meta = objects.ImageMeta.from_dict(self.test_image_meta)
         flavor = objects.Flavor(memory_mb=1024, vcpus=2, root_gb=496,
                                 ephemeral_gb=8128, swap=33550336, name='fake',
-                                extra_specs={}, id=42)
+                                extra_specs={}, id=42, flavorid='someflavor')
         instance_ref.flavor = flavor
 
         caps = vconfig.LibvirtConfigCaps()
@@ -4112,7 +4153,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
         image_meta = objects.ImageMeta.from_dict(self.test_image_meta)
         flavor = objects.Flavor(memory_mb=2048, vcpus=2, root_gb=496,
                                 ephemeral_gb=8128, swap=33550336, name='fake',
-                                extra_specs={}, id=42)
+                                extra_specs={}, id=42, flavorid='someflavor')
         instance_ref.flavor = flavor
 
         caps = vconfig.LibvirtConfigCaps()
@@ -4165,7 +4206,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
         image_meta = objects.ImageMeta.from_dict(self.test_image_meta)
         flavor = objects.Flavor(memory_mb=2048, vcpus=4, root_gb=496,
                                 ephemeral_gb=8128, swap=33550336, name='fake',
-                                extra_specs={}, id=42)
+                                extra_specs={}, id=42, flavorid='someflavor')
         instance_ref.flavor = flavor
 
         caps = vconfig.LibvirtConfigCaps()
@@ -4242,7 +4283,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
         image_meta = objects.ImageMeta.from_dict(self.test_image_meta)
         flavor = objects.Flavor(memory_mb=2048, vcpus=4, root_gb=496,
                                 ephemeral_gb=8128, swap=33550336, name='fake',
-                                extra_specs={}, id=42)
+                                extra_specs={}, id=42, flavorid='someflavor')
         instance_ref.flavor = flavor
 
         caps = vconfig.LibvirtConfigCaps()
@@ -4320,7 +4361,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
         image_meta = objects.ImageMeta.from_dict(self.test_image_meta)
         flavor = objects.Flavor(memory_mb=2048, vcpus=2, root_gb=496,
                                 ephemeral_gb=8128, swap=33550336, name='fake',
-                                extra_specs={}, id=42)
+                                extra_specs={}, id=42, flavorid='someflavor')
         instance_ref.flavor = flavor
 
         caps = vconfig.LibvirtConfigCaps()
@@ -4409,7 +4450,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
         image_meta = objects.ImageMeta.from_dict(self.test_image_meta)
         flavor = objects.Flavor(memory_mb=2048, vcpus=8, root_gb=496,
                                 ephemeral_gb=8128, swap=33550336, name='fake',
-                                extra_specs={}, id=42)
+                                extra_specs={}, id=42, flavorid='someflavor')
         instance_ref.flavor = flavor
 
         caps = vconfig.LibvirtConfigCaps()
@@ -4523,7 +4564,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
         image_meta = objects.ImageMeta.from_dict(self.test_image_meta)
         flavor = objects.Flavor(memory_mb=2048, vcpus=8, root_gb=496,
                                 ephemeral_gb=8128, swap=33550336, name='fake',
-                                extra_specs={}, id=42)
+                                extra_specs={}, id=42, flavorid='someflavor')
         instance_ref.flavor = flavor
 
         caps = vconfig.LibvirtConfigCaps()
@@ -4626,7 +4667,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
                 "hw:cpu_realtime": "yes",
                 "hw:cpu_policy": "mixed",
                 "hw:cpu_realtime_mask": "^2-3"
-            }, id=42)
+            }, id=42, flavorid='someflavor')
         instance_ref.flavor = flavor
 
         caps = vconfig.LibvirtConfigCaps()
@@ -4735,7 +4776,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
         image_meta = objects.ImageMeta.from_dict(self.test_image_meta)
         flavor = objects.Flavor(memory_mb=2048, vcpus=4, root_gb=496,
                                 ephemeral_gb=8128, swap=33550336, name='fake',
-                                extra_specs={}, id=42)
+                                extra_specs={}, id=42, flavorid='someflavor')
         instance_ref.flavor = flavor
 
         caps = vconfig.LibvirtConfigCaps()
@@ -4819,7 +4860,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
                                     "hw:cpu_realtime": "yes",
                                     "hw:cpu_policy": "dedicated",
                                     "hw:cpu_realtime_mask": "^0-1"
-                                }, id=42)
+                                }, id=42, flavorid='someflavor')
         instance_ref.flavor = flavor
 
         caps = vconfig.LibvirtConfigCaps()
diff --git a/nova/virt/driver.py b/nova/virt/driver.py
index 8f99b0834b..3b814dc31c 100644
--- a/nova/virt/driver.py
+++ b/nova/virt/driver.py
@@ -49,6 +49,7 @@ LOG = logging.getLogger(__name__)
 @dataclasses.dataclass
 class FlavorMeta:
     name: str
+    flavorid: str
     memory_mb: int
     vcpus: int
     root_gb: int
@@ -376,6 +377,7 @@ class ComputeDriver(object):
         )
         flavor = FlavorMeta(
             name=instance.flavor.name,
+            flavorid=instance.flavor.flavorid,
             memory_mb=instance.flavor.memory_mb,
             vcpus=instance.flavor.vcpus,
             ephemeral_gb=instance.flavor.ephemeral_gb,
diff --git a/nova/virt/libvirt/config.py b/nova/virt/libvirt/config.py
index 7b31bd2a24..5ae7e63846 100644
--- a/nova/virt/libvirt/config.py
+++ b/nova/virt/libvirt/config.py
@@ -3804,15 +3804,18 @@ class LibvirtConfigGuestMetaNovaFlavor(LibvirtConfigObject):
                              ns_uri=NOVA_NS)
 
         self.name = None
+        self.id = None
         self.memory = None
         self.disk = None
         self.swap = None
         self.ephemeral = None
         self.vcpus = None
+        self.extra_specs = None
 
     def format_dom(self):
         meta = super(LibvirtConfigGuestMetaNovaFlavor, self).format_dom()
         meta.set("name", self.name)
+        meta.set("id", self.id)
         if self.memory is not None:
             meta.append(self._text_node("memory", str(self.memory)))
         if self.disk is not None:
@@ -3823,6 +3826,28 @@ class LibvirtConfigGuestMetaNovaFlavor(LibvirtConfigObject):
             meta.append(self._text_node("ephemeral", str(self.ephemeral)))
         if self.vcpus is not None:
             meta.append(self._text_node("vcpus", str(self.vcpus)))
+        extra_specs_meta = LibvirtConfigGuestMetaNovaFlavorExtraSpecs()
+        if self.extra_specs is not None:
+            extra_specs_meta.extra_specs = self.extra_specs
+        meta.append(extra_specs_meta.format_dom())
+        return meta
+
+
+class LibvirtConfigGuestMetaNovaFlavorExtraSpecs(LibvirtConfigObject):
+
+    def __init__(self):
+        super().__init__(root_name="extraSpecs",
+                         ns_prefix="nova",
+                         ns_uri=NOVA_NS)
+        self.extra_specs = None
+
+    def format_dom(self):
+        meta = super().format_dom()
+        if self.extra_specs is not None:
+            for key, value in self.extra_specs.items():
+                node = self._text_node("extraSpec", value)
+                node.set("name", key)
+                meta.append(node)
         return meta
 
 
diff --git a/nova/virt/libvirt/driver.py b/nova/virt/libvirt/driver.py
index e85a752342..75d113261e 100644
--- a/nova/virt/libvirt/driver.py
+++ b/nova/virt/libvirt/driver.py
@@ -6250,11 +6250,13 @@ class LibvirtDriver(driver.ComputeDriver):
 
         fmeta = vconfig.LibvirtConfigGuestMetaNovaFlavor()
         fmeta.name = dmeta.flavor.name
+        fmeta.id = dmeta.flavor.flavorid
         fmeta.memory = dmeta.flavor.memory_mb
         fmeta.vcpus = dmeta.flavor.vcpus
         fmeta.ephemeral = dmeta.flavor.ephemeral_gb
         fmeta.disk = dmeta.flavor.root_gb
         fmeta.swap = dmeta.flavor.swap
+        fmeta.extra_specs = dmeta.flavor.extra_specs
 
         meta.flavor = fmeta
 
diff --git a/releasenotes/notes/bp-xml-image-meta-037f4eba59f0121e.yaml b/releasenotes/notes/bp-xml-image-meta-037f4eba59f0121e.yaml
new file mode 100644
index 0000000000..79fcb3a850
--- /dev/null
+++ b/releasenotes/notes/bp-xml-image-meta-037f4eba59f0121e.yaml
@@ -0,0 +1,15 @@
+---
+features:
+  - |
+    Additional information regarding an instance's flavor (the ID
+    and the defined extra specs at the time the instance was launched)
+    has been added to the libvirt domain metadata for instances.
+    This allows downstream clients that queries libvirt domain metadata,
+    such as Ceilometer, to avoid performing additional Nova API queries
+    to get this information.
+
+upgrades:
+  - |
+    To expose the newly added attributes in the libvirt domain metadata
+    in an upgraded environment, already running instances will need to
+    be shutdown, restarted, cold migrated or shelved and unshelved.