hotplug_virtio_mem: implements virtio-mem hotunplug

Implements virtio-mem hotunplug as the final step of
the test case. At first, it tries to unplug the virtio-mem
device with some memory plugged in; as expected the
exception is catched. Finally resizes the device to zero
and the hotunplug is successfully done.

Signed-off-by: mcasquer <[email protected]>

qemu/tests/hotplug_virtio_mem.py

@@ -2,6 +2,7 @@
 
 from virttest import error_context
 
+from virttest.qemu_monitor import QMPCmdError
 from virttest.utils_misc import normalize_data_size
 from virttest.utils_test.qemu import MemoryHotplugTest
 from provider import virtio_mem_utils
@@ -53,4 +54,13 @@ def run(test, params, env):
                                               threshold, vm, test)
         virtio_mem_utils.check_numa_plugged_mem(node_id, requested_size,
                                                 threshold, vm, test)
+    try:
+        hotplug_test.unplug_memory(vm, target_mem)
+    except QMPCmdError:
+        test.log.info("virtio-mem device cannot get unplugged while 'size' != '0'")
+
+    vm.monitor.qom_set(device_id, "requested-size", 0)
+    time.sleep(10)
+    hotplug_test.unplug_memory(vm, target_mem)
+
     session.close()