Fixes PowerVM spawn failed as missing attr supported_instances

During test in a cross-hypervisor environment (KVM+PowerVM), user will run
into an issue during deploying an instance for Power host by PowerVM driver,
though the property "hypervisor_type" for the PowerVM image have been
configured. Since the _update_host_stats of PowerVM driver missing the
attribute "supported_instances".

Fixes bug: 1155498

Change-Id: I81259d153a7b5ae35747e57c53b14e0075d28d78

nova/tests/test_powervm.py

@@ -393,3 +393,26 @@ def test_get_long_resize_name(self):
         expected_name = 'rsz__really_long_instance_name_00000001'
         result = self.powervm_connection._get_resize_name(inst_name)
         self.assertEqual(expected_name, result)
+
+    def test_get_host_stats(self):
+        host_stats = self.powervm_connection.get_host_stats(True)
+        self.assertIsNotNone(host_stats)
+        self.assertEquals(host_stats['vcpus'], 8.0)
+        self.assertEquals(round(host_stats['vcpus_used'], 1), 1.7)
+        self.assertEquals(host_stats['host_memory_total'], 65536)
+        self.assertEquals(host_stats['host_memory_free'], 46336)
+        self.assertEquals(host_stats['disk_total'], 10168)
+        self.assertEquals(host_stats['disk_used'], 0)
+        self.assertEquals(host_stats['disk_available'], 10168)
+        self.assertEquals(host_stats['disk_total'],
+                          host_stats['disk_used'] +
+                          host_stats['disk_available'])
+
+        self.assertEquals(host_stats['cpu_info'], ('ppc64', 'powervm', '3940'))
+        self.assertEquals(host_stats['hypervisor_type'], 'powervm')
+        self.assertEquals(host_stats['hypervisor_version'], '7.1')
+
+        self.assertEquals(host_stats['hypervisor_hostname'], "fake-powervm")
+        self.assertEquals(host_stats['supported_instances'][0][0], "ppc64")
+        self.assertEquals(host_stats['supported_instances'][0][1], "powervm")
+        self.assertEquals(host_stats['supported_instances'][0][2], "hvm")

nova/virt/powervm/constants.py

@@ -30,6 +30,7 @@
 POWERVM_CPU_INFO = ('ppc64', 'powervm', '3940')
 POWERVM_HYPERVISOR_TYPE = 'powervm'
 POWERVM_HYPERVISOR_VERSION = '7.1'
+POWERVM_SUPPORTED_INSTANCES = [('ppc64', 'powervm', 'hvm')]
 
 POWERVM_MIN_ROOT_GB = 10
 

nova/virt/powervm/operator.py

@@ -165,6 +165,7 @@ def _update_host_stats(self):
         data['hypervisor_type'] = constants.POWERVM_HYPERVISOR_TYPE
         data['hypervisor_version'] = constants.POWERVM_HYPERVISOR_VERSION
         data['hypervisor_hostname'] = self._operator.get_hostname()
+        data['supported_instances'] = constants.POWERVM_SUPPORTED_INSTANCES
         data['extres'] = ''
 
         self._host_stats = data