diff --git a/nova/tests/unit/virt/libvirt/test_config.py b/nova/tests/unit/virt/libvirt/test_config.py
index 2a79b50e0bb9..02b554e66180 100644
--- a/nova/tests/unit/virt/libvirt/test_config.py
+++ b/nova/tests/unit/virt/libvirt/test_config.py
@@ -3135,6 +3135,7 @@ class LibvirtConfigGuestTest(LibvirtConfigBaseTest):
         self.assertEqual('fake_machine_type', obj.os_mach_type)
         self.assertEqual('/tmp/vmlinuz', obj.os_kernel)
         self.assertEqual('/usr/lib/xen/boot/hvmloader', obj.os_loader)
+        self.assertNotIn(config.LibvirtConfigGuestFeatureSMM(), obj.features)
         self.assertIsNone(obj.os_loader_type)
         self.assertIsNone(obj.os_loader_readonly)
         self.assertIsNone(obj.os_loader_secure)
@@ -3157,6 +3158,10 @@ class LibvirtConfigGuestTest(LibvirtConfigBaseTest):
               <loader readonly='yes' type='pflash'>/tmp/OVMF_CODE.fd</loader>
               <nvram template='/tmp/OVMF_VARS.fd'>/var/lib/libvirt/qemu/nvram/instance.fd</nvram>
             </os>
+            <features>
+              <acpi/>
+              <smm state='on'/>
+            </features>
           </domain>
         """  # noqa: E501
 
@@ -3167,6 +3172,7 @@ class LibvirtConfigGuestTest(LibvirtConfigBaseTest):
         self.assertEqual('hvm', obj.os_type)
         self.assertIsNone(obj.os_mach_type)
         self.assertIsNone(obj.os_kernel)
+        self.assertIn(config.LibvirtConfigGuestFeatureSMM(), obj.features)
         self.assertEqual('/tmp/OVMF_CODE.fd', obj.os_loader)
         self.assertEqual('pflash', obj.os_loader_type)
         self.assertTrue(obj.os_loader_readonly)
@@ -3190,6 +3196,9 @@ class LibvirtConfigGuestTest(LibvirtConfigBaseTest):
               <loader readonly='yes' secure='yes' type='pflash'>/tmp/OVMF_CODE.secboot.fd</loader>
               <nvram template='/tmp/OVMF_VARS.secboot.fd'>/var/lib/libvirt/qemu/nvram/instance.fd</nvram>
             </os>
+            <features>
+              <smm/>
+            </features>
           </domain>
         """  # noqa: E501
 
@@ -3200,6 +3209,7 @@ class LibvirtConfigGuestTest(LibvirtConfigBaseTest):
         self.assertEqual('hvm', obj.os_type)
         self.assertIsNone(obj.os_mach_type)
         self.assertIsNone(obj.os_kernel)
+        self.assertIn(config.LibvirtConfigGuestFeatureSMM(), obj.features)
         self.assertEqual('/tmp/OVMF_CODE.secboot.fd', obj.os_loader)
         self.assertEqual('pflash', obj.os_loader_type)
         self.assertTrue(obj.os_loader_readonly)
@@ -3222,6 +3232,9 @@ class LibvirtConfigGuestTest(LibvirtConfigBaseTest):
               <type>hvm</type>
               <loader readonly='yes' stateless='yes' type='pflash'>/tmp/OVMF_CODE.fd</loader>
             </os>
+            <features>
+              <acpi/>
+            </features>
           </domain>
         """  # noqa: E501
 
@@ -3232,6 +3245,7 @@ class LibvirtConfigGuestTest(LibvirtConfigBaseTest):
         self.assertEqual('hvm', obj.os_type)
         self.assertIsNone(obj.os_mach_type)
         self.assertIsNone(obj.os_kernel)
+        self.assertNotIn(config.LibvirtConfigGuestFeatureSMM(), obj.features)
         self.assertEqual('/tmp/OVMF_CODE.fd', obj.os_loader)
         self.assertEqual('pflash', obj.os_loader_type)
         self.assertTrue(obj.os_loader_readonly)
diff --git a/nova/virt/libvirt/config.py b/nova/virt/libvirt/config.py
index 91f70931be95..a6bb370cf439 100644
--- a/nova/virt/libvirt/config.py
+++ b/nova/virt/libvirt/config.py
@@ -827,8 +827,10 @@ class LibvirtConfigCPUFeature(LibvirtConfigObject):
 
         return ft
 
-    def __eq__(self, obj):
-        return obj.name == self.name
+    def __eq__(self, other):
+        if not isinstance(other, LibvirtConfigCPUFeature):
+            return False
+        return other.name == self.name
 
     def __ne__(self, obj):
         return obj.name != self.name
@@ -2907,6 +2909,11 @@ class LibvirtConfigGuestFeature(LibvirtConfigObject):
         super(LibvirtConfigGuestFeature, self).__init__(root_name=name,
                                                         **kwargs)
 
+    def __eq__(self, other):
+        if not isinstance(other, LibvirtConfigGuestFeature):
+            return False
+        return other.root_name == self.root_name
+
 
 class LibvirtConfigGuestFeatureACPI(LibvirtConfigGuestFeature):
 
@@ -2940,6 +2947,11 @@ class LibvirtConfigGuestFeatureSMM(LibvirtConfigGuestFeature):
 
     def __init__(self, **kwargs):
         super(LibvirtConfigGuestFeatureSMM, self).__init__("smm", **kwargs)
+        # NOTE(tkajinam): The smm feature also supports tseg sub-element, which
+        # has not set by nova or libvirt. Using the tseg option requires
+        # huge caution according to libvirt doc[1], so the option is
+        # intentionally left unimplemented now.
+        # [1] https://libvirt.org/formatdomain.html#hypervisor-features
 
     def format_dom(self):
         root = super(LibvirtConfigGuestFeatureSMM, self).format_dom()
@@ -3385,6 +3397,7 @@ class LibvirtConfigGuest(LibvirtConfigObject):
     def parse_dom(self, xmldoc):
         self.virt_type = xmldoc.get('type')
         # Note: This cover only for: LibvirtConfigGuestDisks
+        #                            LibvirtConfigGuestFeatureSMM
         #                            LibvirtConfigGuestFilesys
         #                            LibvirtConfigGuestHostdevPCI
         #                            LibvirtConfigGuestHostdevMDEV
@@ -3448,6 +3461,10 @@ class LibvirtConfigGuest(LibvirtConfigObject):
                 self._parse_os(c)
             elif c.tag == 'iothreads':
                 self.iothreads = int(c.text)
+            elif c.tag == 'features':
+                for f in c:
+                    if f.tag == 'smm' and f.get('state', 'on') == 'on':
+                        self.features.append(LibvirtConfigGuestFeatureSMM())
             else:
                 self._parse_basic_props(c)