Test numa and vcpu topologies bug: #1910466

This change reproduces bug #1910466
When hw:cpu_max_[sockets|cores|threads] is configured
in addition to an explict numa topologies and cpu pinning
nova is currently incapable of generating the correct
virtual CPU topology resulting in an index out of range
error as we attempt to retrieve the first topology
from an empty list.

This change reproduces the error via a new functional
test.

Related-Bug: #1910466
Change-Id: I333b3d85deed971678141307dd06545e308cf989

nova/tests/functional/libvirt/test_numa_servers.py

@@ -103,8 +103,8 @@ class NUMAServersTest(NUMAServersTestBase):
         nodes.
         """
 
-        host_info = fakelibvirt.HostInfo(cpu_nodes=2, cpu_sockets=1,
-                                         cpu_cores=2, cpu_threads=2)
+        host_info = fakelibvirt.HostInfo(
+            cpu_nodes=2, cpu_sockets=1, cpu_cores=2, cpu_threads=2)
         self.start_compute(host_info=host_info, hostname='compute1')
 
         extra_spec = {'hw:numa_nodes': '2'}
@@ -119,6 +119,41 @@ class NUMAServersTest(NUMAServersTestBase):
         self.assertNotIn('cpu_topology', inst.numa_topology.cells[0])
         self.assertNotIn('cpu_topology', inst.numa_topology.cells[1])
 
+    def test_create_server_with_numa_topology_and_cpu_topology_and_pinning(
+            self):
+        """Create a server with two NUMA nodes.
+
+        This should pass and result in a guest NUMA topology with two NUMA
+        nodes, pinned cpus and numa affined memory.
+        """
+
+        host_info = fakelibvirt.HostInfo(
+            cpu_nodes=2, cpu_sockets=1, cpu_cores=4, cpu_threads=1,
+            kB_mem=(1024 * 1024 * 16))  # 16 GB
+        self.start_compute(host_info=host_info, hostname='compute1')
+
+        extra_spec = {
+            'hw:numa_nodes': '2',
+            'hw:cpu_max_sockets': '2',
+            'hw:cpu_max_cores': '2',
+            'hw:cpu_max_threads': '8',
+            'hw:cpu_policy': 'dedicated',
+            'hw:mem_page_size': 'any'
+        }
+        flavor_id = self._create_flavor(vcpu=8, extra_spec=extra_spec)
+        self._run_build_test(flavor_id, end_status='ERROR')
+
+        # FIXME(sean-k-mooney): The instance should boot but
+        # it fails due to https://bugs.launchpad.net/nova/+bug/1910466
+        msg = "IndexError: list index out of range"
+        self.assertIn(msg, self.stdlog.logger.output)
+        # ctx = nova_context.get_admin_context()
+        # inst = objects.Instance.get_by_uuid(ctx, server['id'])
+        # self.assertEqual(2, len(inst.numa_topology.cells))
+        # self.assertLessEqual(inst.vcpu_model.topology.sockets, 2)
+        # self.assertLessEqual(inst.vcpu_model.topology.cores, 2)
+        # self.assertLessEqual(inst.vcpu_model.topology.threads, 8)
+
     def test_create_server_with_numa_fails(self):
         """Create a two NUMA node instance on a host with only one node.