acrn-config: avoid conflict slot for launch config

The slot in launch config would be conflicted when the same bdf is
selected from webUI.
This patch do the below condition to avoid such case:
1. Add the bdf check for pass-through devices.
2. Use the bus:dev:func as passthru device option in launch config.

v1-v2:
1. If BUS of PCI device for passthru is not 0, then alloc a virtual
slot for it.

Tracked-On: #4312
Signed-off-by: Wei Liu <weix.w.liu@intel.com>
Acked-by: Victor Sun <victor.sun@intel.com>

misc/acrn-config/launch_config/launch_item.py

@@ -145,6 +145,7 @@ class PthruSelected():
 
         # check connections between several pass-through devices
         launch_cfg_lib.pt_devs_check_audio(self.bdf['audio'], self.bdf['audio_codec'])
+        launch_cfg_lib.bdf_duplicate_check(self.bdf)
 
 
 class VirtioDeviceSelect():

misc/acrn-config/library/launch_cfg_lib.py

@@ -545,8 +545,6 @@ def virtual_dev_slot(dev):
     max_slot = 31
     base_slot = 3
 
-    #slot_used_len = len(list(PT_SLOT.values()))
-
     # get devices slot which already stored
     if dev in list(PT_SLOT.keys()):
         return PT_SLOT[dev]
@@ -574,11 +572,16 @@ def get_slot(bdf_list, dev):
         if not bdf_list[p_id]:
             slot_list[p_id] = ''
         else:
+            bus = int(bdf_list[p_id][0:2], 16)
             slot = int(bdf_list[p_id][3:5], 16)
-            # re-allocate virtual slot while slot is 0
-            if slot == 0:
-                slot = virtual_dev_slot(dev)
-            slot_list[p_id] = slot
+            fun = int(bdf_list[p_id][6:7], 16)
+            slot_fun = str(bus) + ":" +  str(slot) + ":" + str(fun)
+            if bus != 0:
+                slot_fun = virtual_dev_slot(dev)
+
+            slot_list[p_id] = slot_fun
+
+            # add already used slot for pass-throught devices to avoid conflict with virtio devices
             PT_SLOT[dev] = slot
 
     return slot_list
@@ -683,3 +686,25 @@ def cpu_sharing_check(cpu_sharing, item):
             key = "uos:id={},{}".format(vm_i, item)
             ERR_LIST[key] = "The same pcpu was configurated in scenario config, and not allow to set the cpu_sharing to 'Disabled'!"
             return
+
+
+def bdf_duplicate_check(bdf_dic):
+    """
+    Check if exist duplicate slot
+    :param bdf_dic: contains all selected pass-through devices
+    :return: None
+    """
+    bdf_used = []
+    for dev in bdf_dic.keys():
+        dev_bdf_dic = bdf_dic[dev]
+        for vm_i in dev_bdf_dic.keys():
+            dev_bdf = dev_bdf_dic[vm_i]
+            if not dev_bdf:
+                continue
+
+            if dev_bdf in bdf_used:
+                key = "uos:id={},{},{}".format(vm_i, 'passthrough_devices', dev)
+                ERR_LIST[key] = "You select the same device for {} pass-through !".format(dev)
+                return
+            else:
+                bdf_used.append(dev_bdf)