fix up numa-topology live migration hypervisor check

It turns out that even when KVM is supported by qemu the libvirt
driver will report the hypervisor type as "QEMU".  So we need to
fix up the hypervisor type check in the live migration code that
checks whether the instance has a NUMA topology.

Closes-Bug: #1818092
Change-Id: I5127227a1e3d76dd413a820b048547ba578aff6b
Signed-off-by: Chris Friesen <[email protected]>

Author: cbf123

nova/conductor/tasks/live_migrate.py

@@ -163,7 +163,10 @@ def _check_instance_has_no_numa(self):
         # HyperV's vNUMA feature doesn't allow specific pinning
         hypervisor_type = objects.ComputeNode.get_by_host_and_nodename(
             self.context, self.source, self.instance.node).hypervisor_type
-        if hypervisor_type != obj_fields.HVType.KVM:
+
+        # KVM is not a hypervisor, so when using a virt_type of "kvm" the
+        # hypervisor_type will still be "QEMU".
+        if hypervisor_type.lower() != obj_fields.HVType.QEMU:
             return
 
         msg = ('Instance has an associated NUMA topology. '

nova/tests/unit/conductor/tasks/test_live_migrate.py

@@ -205,7 +205,7 @@ def test_check_instance_has_no_numa_passes_workaround(self, mock_get):
     def test_check_instance_has_no_numa_fails(self, mock_get):
         self.flags(enable_numa_live_migration=False, group='workarounds')
         mock_get.return_value = objects.ComputeNode(
-            uuid=uuids.cn1, hypervisor_type='kvm')
+            uuid=uuids.cn1, hypervisor_type='QEMU')
         self.task.instance.numa_topology = objects.InstanceNUMATopology(
             cells=[objects.InstanceNUMACell(id=0, cpuset=set([0]),
                                             memory=1024)])