[openstack-hypervisor] Add support for sev

* Add new config parameter reserved-host-memory-mb-for-sev
that updates snap config sev.reserved-host-memory-mb
* Add an action list-flavors to list the host flavors/
capabilities

Change-Id: I2500d1dafc0bb77dafa8a681daf833f7d1f76211

charms/openstack-hypervisor/charmcraft.yaml

@@ -42,6 +42,13 @@ config:
     use-data-binding:
       default: false
       type: boolean
+    reserved-host-memory-mb-for-sev:
+      type: string
+      description: |
+        Memory to be reserved for host for SEV enabled compute
+        hosts. This memory will be used for instances. The compute
+        usage report deducts this memory from the available
+        memory sent to the placement service.
 
 actions:
   set-hypervisor-local-settings:
@@ -81,6 +88,9 @@ actions:
 
       Only lists guests created by the OpenStack cloud.
     additionalProperties: false
+  list-flavors:
+    description: |
+      List the flavors or compute host capabilities.
 
 requires:
   amqp:

charms/openstack-hypervisor/src/charm.py

@@ -191,6 +191,10 @@ class HypervisorOperatorCharm(sunbeam_charm.OSBaseOperatorCharm):
             self.on.running_guests_action,
             self._running_guests_action,
         )
+        self.framework.observe(
+            self.on.list_flavors_action,
+            self._list_flavors_action,
+        )
         self.framework.observe(
             self.on.install,
             self._on_install,
@@ -422,6 +426,18 @@ class HypervisorOperatorCharm(sunbeam_charm.OSBaseOperatorCharm):
         # cli returns a json list
         event.set_results({"result": stdout})
 
+    def _list_flavors_action(self, event: ActionEvent):
+        """List compute host capabilities."""
+        cache = self.get_snap_cache()
+        hypervisor = cache["openstack-hypervisor"]
+        try:
+            flavors = hypervisor.get("compute.flavors", typed=True)
+        except snap.SnapError as e:
+            logger.debug(e)
+            flavors = ""
+
+        event.set_results({"result": flavors})
+
     def ensure_services_running(self):
         """Ensure systemd services running."""
         # This should taken care of by the snap
@@ -575,6 +591,9 @@ class HypervisorOperatorCharm(sunbeam_charm.OSBaseOperatorCharm):
                 "node.ip-address": config("ip-address") or local_ip,
                 "rabbitmq.url": contexts.amqp.transport_url,
                 "monitoring.enable": self.enable_monitoring,
+                "sev.reserved-host-memory-mb": config(
+                    "reserved-host-memory-mb-for-sev"
+                ),
             }
         except AttributeError as e:
             raise sunbeam_guard.WaitingExceptionError(

charms/openstack-hypervisor/tests/unit/test_charm.py

@@ -174,6 +174,7 @@ class TestCharm(test_utils.CharmTestCase):
             "telemetry.enable": False,
             "ca.bundle": None,
             "masakari.enable": False,
+            "sev.reserved-host-memory-mb": None,
         }
         hypervisor_snap_mock.set.assert_any_call(expect_settings, typed=True)
 
@@ -287,6 +288,7 @@ class TestCharm(test_utils.CharmTestCase):
             "telemetry.publisher-secret": "FAKE_SECRET",
             "ca.bundle": None,
             "masakari.enable": True,
+            "sev.reserved-host-memory-mb": None,
         }
         hypervisor_snap_mock.set.assert_any_call(expect_settings, typed=True)
 
@@ -346,3 +348,16 @@ class TestCharm(test_utils.CharmTestCase):
         self.subprocess.run = subprocess_run_mock
         with self.assertRaises(ops.testing.ActionFailed):
             self.harness.run_action("list-nics")
+
+    def test_list_flavors(self):
+        """Check action return flavors."""
+        flavors = "flavor1,flavor2"
+        self.harness.begin()
+        hypervisor_snap_mock = MagicMock()
+        hypervisor_snap_mock.present = True
+        self.snap.SnapCache.return_value = {
+            "openstack-hypervisor": hypervisor_snap_mock
+        }
+        hypervisor_snap_mock.get.return_value = flavors
+        action_output = self.harness.run_action("list-flavors")
+        assert action_output.results["result"] == flavors