diff --git a/nova/tests/test_libvirt.py b/nova/tests/test_libvirt.py
index 3bb377e2..55e8286a 100644
--- a/nova/tests/test_libvirt.py
+++ b/nova/tests/test_libvirt.py
@@ -614,6 +614,76 @@ class LibvirtConnTestCase(test.TestCase):
                           config.LibvirtConfigGuestDisk)
         self.assertEquals(cfg.devices[3].target_dev, 'vdd')
 
+    def test_get_guest_cpu_config_none(self):
+        conn = libvirt_driver.LibvirtDriver(True)
+        instance_ref = db.instance_create(self.context, self.test_instance)
+
+        conf = conn.get_guest_config(instance_ref,
+                                    _fake_network_info(self.stubs, 1),
+                                    None, None)
+        self.assertEquals(conf.cpu, None)
+
+    @test.skip_if(missing_libvirt(), "Test requires libvirt")
+    def test_get_guest_cpu_config_host_passthrough_new(self):
+        def get_lib_version_stub(self):
+            return (0 * 1000 * 1000) + (9 * 1000) + 11
+
+        self.stubs.Set(libvirt.virConnect,
+                       "getLibVersion",
+                       get_lib_version_stub)
+        conn = libvirt_driver.LibvirtDriver(True)
+        instance_ref = db.instance_create(self.context, self.test_instance)
+
+        self.flags(libvirt_cpu_mode="host-passthrough")
+        conf = conn.get_guest_config(instance_ref,
+                                     _fake_network_info(self.stubs, 1),
+                                     None, None)
+        self.assertEquals(type(conf.cpu),
+                          config.LibvirtConfigGuestCPU)
+        self.assertEquals(conf.cpu.mode, "host-passthrough")
+        self.assertEquals(conf.cpu.model, None)
+
+    @test.skip_if(missing_libvirt(), "Test requires libvirt")
+    def test_get_guest_cpu_config_host_model_new(self):
+        def get_lib_version_stub(self):
+            return (0 * 1000 * 1000) + (9 * 1000) + 11
+
+        self.stubs.Set(libvirt.virConnect,
+                       "getLibVersion",
+                       get_lib_version_stub)
+        conn = libvirt_driver.LibvirtDriver(True)
+        instance_ref = db.instance_create(self.context, self.test_instance)
+
+        self.flags(libvirt_cpu_mode="host-model")
+        conf = conn.get_guest_config(instance_ref,
+                                     _fake_network_info(self.stubs, 1),
+                                     None, None)
+        self.assertEquals(type(conf.cpu),
+                          config.LibvirtConfigGuestCPU)
+        self.assertEquals(conf.cpu.mode, "host-model")
+        self.assertEquals(conf.cpu.model, None)
+
+    @test.skip_if(missing_libvirt(), "Test requires libvirt")
+    def test_get_guest_cpu_config_custom_new(self):
+        def get_lib_version_stub(self):
+            return (0 * 1000 * 1000) + (9 * 1000) + 11
+
+        self.stubs.Set(libvirt.virConnect,
+                       "getLibVersion",
+                       get_lib_version_stub)
+        conn = libvirt_driver.LibvirtDriver(True)
+        instance_ref = db.instance_create(self.context, self.test_instance)
+
+        self.flags(libvirt_cpu_mode="custom")
+        self.flags(libvirt_cpu_model="Penryn")
+        conf = conn.get_guest_config(instance_ref,
+                                     _fake_network_info(self.stubs, 1),
+                                     None, None)
+        self.assertEquals(type(conf.cpu),
+                          config.LibvirtConfigGuestCPU)
+        self.assertEquals(conf.cpu.mode, "custom")
+        self.assertEquals(conf.cpu.model, "Penryn")
+
     def test_xml_and_uri_no_ramdisk_no_kernel(self):
         instance_data = dict(self.test_instance)
         self._check_xml_and_uri(instance_data,