Update libvirt enlightenments for Windows

libvirt has a set of enlightenments in domain XML that make it
friendlier for Windows guests. We already enabled a few of these, this
patch just completes the list. All of them are available in libvirt
4.7.0 (QEMU 3.0) [1], which is way below our current minimum libvirt
and QEMU versions, so we don't need any extra checks.

[1] https://libvirt.org/formatdomain.html#hypervisor-features

Implements: bp/libvirt-update-windows-englightenments
Change-Id: I008841988547573878c4e06e82f0fa55084e51b5

nova/tests/unit/virt/libvirt/test_config.py

@@ -2318,6 +2318,15 @@ class LibvirtConfigGuestFeatureTest(LibvirtConfigBaseTest):
         obj.vapic = True
         obj.spinlocks = True
         obj.vendorid_spoof = True
+        obj.vpindex = True
+        obj.runtime = True
+        obj.synic = True
+        obj.reset = True
+        obj.frequencies = True
+        obj.reenlightenment = True
+        obj.tlbflush = True
+        obj.ipi = True
+        obj.evmcs = True
 
         xml = obj.to_xml()
         self.assertXmlEqual(xml, """
@@ -2326,6 +2335,15 @@ class LibvirtConfigGuestFeatureTest(LibvirtConfigBaseTest):
             <vapic state="on"/>
             <spinlocks state="on" retries="4095"/>
             <vendor_id state="on" value="1234567890ab"/>
+            <vpindex state='on'/>
+            <runtime state='on'/>
+            <synic state='on'/>
+            <reset state='on'/>
+            <frequencies state='on'/>
+            <reenlightenment state='on'/>
+            <tlbflush state='on'/>
+            <ipi state='on'/>
+            <evmcs state='on'/>
           </hyperv>""")
 
     def test_feature_pmu(self):

nova/tests/unit/virt/libvirt/test_driver.py

@@ -27172,6 +27172,35 @@ class LibvirtDriverTestCase(test.NoDBTestCase, TraitsComparisonMixin):
         mock_get_guest.return_value.assert_not_called()
         self.assertIsNone(mock_find.call_args.args[3])
 
+    def test_set_features_windows(self):
+        self.flags(virt_type='kvm', group='libvirt')
+        guest = vconfig.LibvirtConfigGuest()
+        self.drvr._set_features(
+            guest, 'windows',
+            objects.ImageMeta(
+                properties=objects.ImageMetaProps()
+            ),
+            objects.Flavor(extra_specs={})
+        )
+        features = guest.features
+        hv = None
+        for feature in features:
+            if feature.root_name == 'hyperv':
+                hv = feature
+        self.assertTrue(hv.relaxed)
+        self.assertTrue(hv.vapic)
+        self.assertTrue(hv.spinlocks)
+        self.assertEqual(8191, hv.spinlock_retries)
+        self.assertTrue(hv.vpindex)
+        self.assertTrue(hv.runtime)
+        self.assertTrue(hv.synic)
+        self.assertTrue(hv.reset)
+        self.assertTrue(hv.frequencies)
+        self.assertTrue(hv.reenlightenment)
+        self.assertTrue(hv.tlbflush)
+        self.assertTrue(hv.ipi)
+        self.assertTrue(hv.evmcs)
+
 
 class LibvirtVolumeUsageTestCase(test.NoDBTestCase):
     """Test for LibvirtDriver.get_all_volume_usage."""

nova/virt/libvirt/config.py

@@ -2732,6 +2732,15 @@ class LibvirtConfigGuestFeatureHyperV(LibvirtConfigGuestFeature):
         self.vapic = False
         self.spinlocks = False
         self.spinlock_retries = self.MIN_SPINLOCK_RETRIES
+        self.vpindex = False
+        self.runtime = False
+        self.synic = False
+        self.reset = False
+        self.frequencies = False
+        self.reenlightenment = False
+        self.tlbflush = False
+        self.ipi = False
+        self.evmcs = False
         self.vendorid_spoof = False
         self.vendorid = self.SPOOFED_VENDOR_ID
 
@@ -2748,6 +2757,24 @@ class LibvirtConfigGuestFeatureHyperV(LibvirtConfigGuestFeature):
         if self.vendorid_spoof:
             root.append(etree.Element("vendor_id", state="on",
                                       value=self.vendorid))
+        if self.vpindex:
+            root.append(etree.Element('vpindex', state='on'))
+        if self.runtime:
+            root.append(etree.Element('runtime', state='on'))
+        if self.synic:
+            root.append(etree.Element('synic', state='on'))
+        if self.reset:
+            root.append(etree.Element('reset', state='on'))
+        if self.frequencies:
+            root.append(etree.Element('frequencies', state='on'))
+        if self.reenlightenment:
+            root.append(etree.Element('reenlightenment', state='on'))
+        if self.tlbflush:
+            root.append(etree.Element('tlbflush', state='on'))
+        if self.ipi:
+            root.append(etree.Element('ipi', state='on'))
+        if self.evmcs:
+            root.append(etree.Element('evmcs', state='on'))
 
         return root
 

nova/virt/libvirt/driver.py

@@ -6080,6 +6080,15 @@ class LibvirtDriver(driver.ComputeDriver):
             # with Microsoft
             hv.spinlock_retries = 8191
             hv.vapic = True
+            hv.vpindex = True
+            hv.runtime = True
+            hv.synic = True
+            hv.reset = True
+            hv.frequencies = True
+            hv.reenlightenment = True
+            hv.tlbflush = True
+            hv.ipi = True
+            hv.evmcs = True
 
             # NOTE(kosamara): Spoofing the vendor_id aims to allow the nvidia
             # driver to work on windows VMs. At the moment, the nvidia driver

releasenotes/notes/update-libvirt-enlightenments-for-windows-23abea98cc1db667.yaml

@@ -0,0 +1,21 @@
+---
+features:
+  - |
+    The following enlightenments are now added by default to the libvirt XML for Windows guests:
+
+    * vpindex
+    * runtime
+    * synic
+    * reset
+    * frequencies
+    * reenlightenment
+    * tlbflush
+    * ipi
+    * evmc
+
+    This adds to the list of already existing enlightenments, namely:
+
+    * relaxed
+    * vapic
+    * spinlocks retries
+    * vendor_id spoofing