qdevices: add insert() at QIOThreadbus

add insert() at QIOThreadbus.

Signed-off-by: Houqi (Nick) Zuo <[email protected]>

virttest/qemu_devices/qdevices.py

@@ -3537,6 +3537,34 @@ def _update_device_props(self, device, addr):
         """Always set device iothread param."""
         self._set_device_props(device, addr)
 
+    def insert(self, device):
+        """
+        Insert device into this bus representation.
+
+        :param device: QBaseDevice device
+        :return: list of added devices on success,
+                 string indicating the failure on failure.
+        """
+        additional_devices = []
+        if not self._check_bus(device):
+            return "BusId"
+        try:
+            addr_pattern = self._dev2addr(device)
+        except (ValueError, LookupError):
+            return "BasicAddress"
+        addr = self.get_free_slot(addr_pattern)
+        if addr is None:
+            if None in addr_pattern:
+                return "NoFreeSlot"
+            else:
+                return "UsedSlot"
+        elif addr is False:
+            return "BadAddr(%s)" % addr
+        else:
+            additional_devices.extend(self._insert(device,
+                                                   self._addr2stor(addr)))
+        return additional_devices
+
 
 class QUnixSocketBus(QSparseBus):
     """