Reproducer for bug 1951656

Due to a new mdev naming, we can't parse it.

Change-Id: I0f785178b132dfef668829558dea9f7e674abadb
Related-Bug: #1951656

Author: sbauza

nova/tests/functional/regressions/test_bug_1951656.py

@@ -0,0 +1,83 @@
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+from oslo_utils import uuidutils
+
+
+from nova.tests.fixtures import libvirt as fakelibvirt
+from nova.tests.functional.libvirt import test_vgpu
+from nova.virt.libvirt import utils as libvirt_utils
+
+
+class VGPUTestsLibvirt7_7(test_vgpu.VGPUTestBase):
+
+    def _create_mdev(self, physical_device, mdev_type, uuid=None):
+        # We need to fake the newly created sysfs object by adding a new
+        # FakeMdevDevice in the existing persisted Connection object so
+        # when asking to get the existing mdevs, we would see it.
+        if not uuid:
+            uuid = uuidutils.generate_uuid()
+        mdev_name = libvirt_utils.mdev_uuid2name(uuid)
+        libvirt_parent = self.pci2libvirt_address(physical_device)
+
+        # Libvirt 7.7 now creates mdevs with a parent_addr suffix.
+        new_mdev_name = '_'.join([mdev_name, libvirt_parent])
+
+        # Here, we get the right compute thanks by the self.current_host that
+        # was modified just before
+        connection = self.computes[
+            self._current_host].driver._host.get_connection()
+        connection.mdev_info.devices.update(
+            {mdev_name: fakelibvirt.FakeMdevDevice(dev_name=new_mdev_name,
+                                                   type_id=mdev_type,
+                                                   parent=libvirt_parent)})
+        return uuid
+
+    def setUp(self):
+        super(VGPUTestsLibvirt7_7, self).setUp()
+        extra_spec = {"resources:VGPU": "1"}
+        self.flavor = self._create_flavor(extra_spec=extra_spec)
+
+        # Start compute1 supporting only nvidia-11
+        self.flags(
+            enabled_mdev_types=fakelibvirt.NVIDIA_11_VGPU_TYPE,
+            group='devices')
+
+        self.compute1 = self.start_compute_with_vgpu('host1')
+
+    def test_create_servers_with_vgpu(self):
+
+        # Create a single instance against a specific compute node.
+        self._create_server(
+            image_uuid='155d900f-4e14-4e4c-a73d-069cbf4541e6',
+            flavor_id=self.flavor, host=self.compute1.host,
+            networks='auto', expected_state='ACTIVE')
+
+        # TODO(sbauza): Modify this once bug #1851656 is fixed.
+        # mdev_name2uuid() raises a badly formed hexadecimal UUID string error
+        self.assertRaises(ValueError,
+                          self.assert_mdev_usage,
+                          self.compute1, expected_amount=1)
+
+        # Now, the problem is that we can't create new instances with VGPUs
+        # from this host.
+        server = self._create_server(
+            image_uuid='155d900f-4e14-4e4c-a73d-069cbf4541e6',
+            flavor_id=self.flavor, host=self.compute1.host,
+            networks='auto', expected_state='ERROR')
+        # The error is due to a bad mdev name parsing
+        self.assertIn('fault', server)
+        # since we only have one host, we have a RescheduledException as this
+        # service was creating an exception and we can't use another one.
+        self.assertIn('Exceeded maximum number of retries',
+                      server['fault']['message'])