diff --git a/misc/config_tools/launch_config/launch_cfg_gen.py b/misc/config_tools/launch_config/launch_cfg_gen.py
index 88c43d948..6b2af9b91 100755
--- a/misc/config_tools/launch_config/launch_cfg_gen.py
+++ b/misc/config_tools/launch_config/launch_cfg_gen.py
@@ -303,12 +303,18 @@ def generate_for_one_vm(board_etree, hv_scenario_etree, vm_scenario_etree, vm_id
     for ivshmem in eval_xpath_all(vm_scenario_etree, f"//IVSHMEM_REGION[PROVIDED_BY = 'Device Model' and .//VM_NAME = '{vm_name}']"):
         vbdf = eval_xpath(ivshmem, f".//VBDF/text()")
         slot = get_slot_by_vbdf(vbdf)
-        script.add_virtual_device("ivshmem", slot, options=f"dm:/{ivshmem.find('NAME').text},{ivshmem.find('IVSHMEM_SIZE').text}")
+        if ivshmem.find('IVSHMEM_REGION_ID') is not None:
+            script.add_virtual_device("ivshmem", slot, options=f"dm:/{ivshmem.find('NAME').text},{ivshmem.find('IVSHMEM_SIZE').text},{ivshmem.find('IVSHMEM_REGION_ID').text}")
+        else:
+            script.add_virtual_device("ivshmem", slot, options=f"dm:/{ivshmem.find('NAME').text},{ivshmem.find('IVSHMEM_SIZE').text},{0}")
 
     for ivshmem in eval_xpath_all(vm_scenario_etree, f"//IVSHMEM_REGION[PROVIDED_BY = 'Hypervisor' and .//VM_NAME = '{vm_name}']"):
         vbdf = eval_xpath(ivshmem, f".//VBDF/text()")
         slot = get_slot_by_vbdf(vbdf)
-        script.add_virtual_device("ivshmem", slot, options=f"hv:/{ivshmem.find('NAME').text},{ivshmem.find('IVSHMEM_SIZE').text}")
+        if ivshmem.find('IVSHMEM_REGION_ID') is not None:
+            script.add_virtual_device("ivshmem", slot, options=f"hv:/{ivshmem.find('NAME').text},{ivshmem.find('IVSHMEM_SIZE').text},{ivshmem.find('IVSHMEM_REGION_ID').text}")
+        else:
+            script.add_virtual_device("ivshmem", slot, options=f"hv:/{ivshmem.find('NAME').text},{ivshmem.find('IVSHMEM_SIZE').text},{0}")
 
     if eval_xpath(vm_scenario_etree, ".//console_vuart/text()") == "PCI":
         script.add_virtual_device("uart", options="vuart_idx:0")
diff --git a/misc/config_tools/schema/types.xsd b/misc/config_tools/schema/types.xsd
index 94be5c620..01ba85793 100644
--- a/misc/config_tools/schema/types.xsd
+++ b/misc/config_tools/schema/types.xsd
@@ -286,7 +286,7 @@ in megabytes. The value should be a power of 2
 and no more than 512.</xs:documentation>
       </xs:annotation>
     </xs:element>
-    <xs:element name="IVSHMEM_REGION_ID" type="xs:integer" default="0">
+    <xs:element name="IVSHMEM_REGION_ID" type="xs:string" default="0">
       <xs:annotation acrn:title="IVSHMEM Region ID">
         <xs:documentation>A stable identification when multiple shared memory regions are provided.</xs:documentation>
       </xs:annotation>