Add existed virtio serial port and serial bus

Signed-off-by: NMicky Yun Chan <michan@redhat.com>

qemu/tests/cfg/virtio_port_hotplug.cfg

@@ -97,3 +97,8 @@
             ringbuf_read_size = 1000
             ringbuf_data = 'adcdefgh'
             ringbuf_format = 'utf8'
+        - hotplug_existed_port_pci:
+            type = virtio_serial_hotplug_existed_port_pci
+            serials += ' vs1 '
+            serial_type_vs1 = 'virtserialport'
+            chardev_backend_channel1 = "tcp_socket"

qemu/tests/virtio_serial_hotplug_existed_port_pci.py

+from virttest import error_context
+from virttest import utils_test
+from virttest import qemu_monitor
+
+
+@error_context.context_aware
+def run(test, params, env):
+    """
+    Add existed virtio serial port and serial bus
+    1) Start guest with virtio-serial-port and virtio-serial-pci
+    2) Hot-plug existed virtio-serial-port
+    3) Hot plug existed virtio-serial-pci
+    :param test: QEMU test object
+    :param params: Dictionary with the test parameters
+    :param env: Dictionary with test environment.
+    """
+    vm = env.get_vm(params["main_vm"])
+    vm.verify_alive()
+    session = vm.wait_for_login()
+    if params['os_type'] == 'windows':
+        utils_test.qemu.windrv_check_running_verifier(
+            session, vm, test, 'vioser', 300)
+    session.close()
+    port = params.objects('serials')[1]
+    virtio_port = vm.devices.get(port)
+    pci_dev_id = virtio_port.params['bus'].split('.')[0]
+    pci_dev = vm.devices.get(pci_dev_id)
+    try:
+        virtio_port.hotplug(vm.monitor)
+    except qemu_monitor.QMPCmdError as e:
+        if 'Duplicate' not in e.data['desc']:
+            test.fail(e.data['desc'])
+    else:
+        test.fail('hotplugg virtserialport device should be failed')
+    try:
+        pci_dev.hotplug(vm.monitor)
+    except qemu_monitor.QMPCmdError as e:
+        if 'Duplicate' not in e.data['desc']:
+            test.fail(e.data['desc'])
+    else:
+        test.fail('hotplugg virtio-serial-pci device should be failed')