diff --git a/misc/config_tools/data/cfl-k700-i7/hybrid_launch_2user_vm.xml b/misc/config_tools/data/cfl-k700-i7/hybrid_launch_2user_vm.xml
index dd3486e18..a931350a3 100644
--- a/misc/config_tools/data/cfl-k700-i7/hybrid_launch_2user_vm.xml
+++ b/misc/config_tools/data/cfl-k700-i7/hybrid_launch_2user_vm.xml
@@ -90,6 +90,7 @@
   </vm>
   <vm id="1">
     <load_order>SERVICE_VM</load_order>
+    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <os_config>
       <kern_type>KERNEL_BZIMAGE</kern_type>
@@ -161,4 +162,4 @@
       <block>./YaaG.img</block>
     </virtio_devices>
   </vm>
-</acrn-config>
\ No newline at end of file
+</acrn-config>
diff --git a/misc/config_tools/data/cfl-k700-i7/hybrid_rt.xml b/misc/config_tools/data/cfl-k700-i7/hybrid_rt.xml
index b74917f59..97e762399 100644
--- a/misc/config_tools/data/cfl-k700-i7/hybrid_rt.xml
+++ b/misc/config_tools/data/cfl-k700-i7/hybrid_rt.xml
@@ -117,6 +117,7 @@
   </vm>
   <vm id="1">
     <load_order>SERVICE_VM</load_order>
+    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <os_config>
       <kern_type>KERNEL_BZIMAGE</kern_type>
@@ -195,4 +196,4 @@
       <block>./YaaG.img</block>
     </virtio_devices>
   </vm>
-</acrn-config>
\ No newline at end of file
+</acrn-config>
diff --git a/misc/config_tools/data/cfl-k700-i7/shared_launch_6user_vm.xml b/misc/config_tools/data/cfl-k700-i7/shared_launch_6user_vm.xml
index a48c976ba..27cde6a8f 100644
--- a/misc/config_tools/data/cfl-k700-i7/shared_launch_6user_vm.xml
+++ b/misc/config_tools/data/cfl-k700-i7/shared_launch_6user_vm.xml
@@ -58,6 +58,7 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
+    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <os_config>
       <kern_type>KERNEL_BZIMAGE</kern_type>
@@ -269,4 +270,4 @@
       <block>./YaaG.img</block>
     </virtio_devices>
   </vm>
-</acrn-config>
\ No newline at end of file
+</acrn-config>
diff --git a/misc/config_tools/data/generic_board/hybrid_launch_2user_vm.xml b/misc/config_tools/data/generic_board/hybrid_launch_2user_vm.xml
index c793b1edc..454c6b912 100644
--- a/misc/config_tools/data/generic_board/hybrid_launch_2user_vm.xml
+++ b/misc/config_tools/data/generic_board/hybrid_launch_2user_vm.xml
@@ -91,6 +91,7 @@
   </vm>
   <vm id="1">
     <load_order>SERVICE_VM</load_order>
+    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <os_config>
       <kern_type>KERNEL_BZIMAGE</kern_type>
@@ -161,4 +162,4 @@
       <block>./YaaG.img</block>
     </virtio_devices>
   </vm>
-</acrn-config>
\ No newline at end of file
+</acrn-config>
diff --git a/misc/config_tools/data/generic_board/hybrid_rt.xml b/misc/config_tools/data/generic_board/hybrid_rt.xml
index b8a869eb2..47e2aa86b 100644
--- a/misc/config_tools/data/generic_board/hybrid_rt.xml
+++ b/misc/config_tools/data/generic_board/hybrid_rt.xml
@@ -111,6 +111,7 @@
   </vm>
   <vm id="1">
     <load_order>SERVICE_VM</load_order>
+    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <os_config>
       <kern_type>KERNEL_BZIMAGE</kern_type>
@@ -184,4 +185,4 @@
       <block>./YaaG.img</block>
     </virtio_devices>
   </vm>
-</acrn-config>
\ No newline at end of file
+</acrn-config>
diff --git a/misc/config_tools/data/generic_board/shared_launch_6user_vm.xml b/misc/config_tools/data/generic_board/shared_launch_6user_vm.xml
index 206dd0d75..23e080fe5 100644
--- a/misc/config_tools/data/generic_board/shared_launch_6user_vm.xml
+++ b/misc/config_tools/data/generic_board/shared_launch_6user_vm.xml
@@ -58,6 +58,7 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
+    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <os_config>
       <kern_type>KERNEL_BZIMAGE</kern_type>
@@ -269,4 +270,4 @@
       <block>./YaaG.img</block>
     </virtio_devices>
   </vm>
-</acrn-config>
\ No newline at end of file
+</acrn-config>
diff --git a/misc/config_tools/data/nuc11tnbi5/hybrid_launch_2user_vm.xml b/misc/config_tools/data/nuc11tnbi5/hybrid_launch_2user_vm.xml
index c793b1edc..454c6b912 100644
--- a/misc/config_tools/data/nuc11tnbi5/hybrid_launch_2user_vm.xml
+++ b/misc/config_tools/data/nuc11tnbi5/hybrid_launch_2user_vm.xml
@@ -91,6 +91,7 @@
   </vm>
   <vm id="1">
     <load_order>SERVICE_VM</load_order>
+    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <os_config>
       <kern_type>KERNEL_BZIMAGE</kern_type>
@@ -161,4 +162,4 @@
       <block>./YaaG.img</block>
     </virtio_devices>
   </vm>
-</acrn-config>
\ No newline at end of file
+</acrn-config>
diff --git a/misc/config_tools/data/nuc11tnbi5/shared_launch_6user_vm.xml b/misc/config_tools/data/nuc11tnbi5/shared_launch_6user_vm.xml
index 50240a3a2..27c6b9e38 100644
--- a/misc/config_tools/data/nuc11tnbi5/shared_launch_6user_vm.xml
+++ b/misc/config_tools/data/nuc11tnbi5/shared_launch_6user_vm.xml
@@ -58,6 +58,7 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
+    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <os_config>
       <kern_type>KERNEL_BZIMAGE</kern_type>
@@ -269,4 +270,4 @@
       <block>./YaaG.img</block>
     </virtio_devices>
   </vm>
-</acrn-config>
\ No newline at end of file
+</acrn-config>
diff --git a/misc/config_tools/data/qemu/shared.xml b/misc/config_tools/data/qemu/shared.xml
index 18e617ac0..265305792 100644
--- a/misc/config_tools/data/qemu/shared.xml
+++ b/misc/config_tools/data/qemu/shared.xml
@@ -59,6 +59,7 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
+    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <os_config>
       <kern_type>KERNEL_BZIMAGE</kern_type>
@@ -80,4 +81,4 @@
     </cpu_affinity>
     <console_vuart>None</console_vuart>
   </vm>
-</acrn-config>
\ No newline at end of file
+</acrn-config>
diff --git a/misc/config_tools/data/tgl-vecow-spc-7100-Corei7/hybrid.xml b/misc/config_tools/data/tgl-vecow-spc-7100-Corei7/hybrid.xml
index 9097106d0..95991b7b7 100644
--- a/misc/config_tools/data/tgl-vecow-spc-7100-Corei7/hybrid.xml
+++ b/misc/config_tools/data/tgl-vecow-spc-7100-Corei7/hybrid.xml
@@ -91,6 +91,7 @@
   </vm>
   <vm id="1">
     <load_order>SERVICE_VM</load_order>
+    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <os_config>
       <kern_type>KERNEL_BZIMAGE</kern_type>
@@ -165,4 +166,4 @@
       <block>./YaaG.img</block>
     </virtio_devices>
   </vm>
-</acrn-config>
\ No newline at end of file
+</acrn-config>
diff --git a/misc/config_tools/data/tgl-vecow-spc-7100-Corei7/shared_launch_2user_vm.xml b/misc/config_tools/data/tgl-vecow-spc-7100-Corei7/shared_launch_2user_vm.xml
index 27bc5d524..87e482c2f 100644
--- a/misc/config_tools/data/tgl-vecow-spc-7100-Corei7/shared_launch_2user_vm.xml
+++ b/misc/config_tools/data/tgl-vecow-spc-7100-Corei7/shared_launch_2user_vm.xml
@@ -70,6 +70,7 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
+    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <os_config>
       <kern_type>KERNEL_BZIMAGE</kern_type>
@@ -155,4 +156,4 @@
       <block>./core-image-weston-intel-corei7-64.wic</block>
     </virtio_devices>
   </vm>
-</acrn-config>
\ No newline at end of file
+</acrn-config>
diff --git a/misc/config_tools/data/whl-ipc-i5/hybrid.xml b/misc/config_tools/data/whl-ipc-i5/hybrid.xml
index cd83afb34..2bac6ca89 100644
--- a/misc/config_tools/data/whl-ipc-i5/hybrid.xml
+++ b/misc/config_tools/data/whl-ipc-i5/hybrid.xml
@@ -89,6 +89,7 @@
   </vm>
   <vm id="1">
     <load_order>SERVICE_VM</load_order>
+    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <os_config>
       <kern_type>KERNEL_BZIMAGE</kern_type>
@@ -159,4 +160,4 @@
       <block>./YaaG.img</block>
     </virtio_devices>
   </vm>
-</acrn-config>
\ No newline at end of file
+</acrn-config>
diff --git a/misc/config_tools/data/whl-ipc-i5/hybrid_rt_launch_1user_vm_waag.xml b/misc/config_tools/data/whl-ipc-i5/hybrid_rt_launch_1user_vm_waag.xml
index 8a7896ce8..76347192b 100644
--- a/misc/config_tools/data/whl-ipc-i5/hybrid_rt_launch_1user_vm_waag.xml
+++ b/misc/config_tools/data/whl-ipc-i5/hybrid_rt_launch_1user_vm_waag.xml
@@ -117,6 +117,7 @@
   </vm>
   <vm id="1">
     <load_order>SERVICE_VM</load_order>
+    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <os_config>
       <kern_type>KERNEL_BZIMAGE</kern_type>
@@ -191,4 +192,4 @@
       <block>./YaaG.img</block>
     </virtio_devices>
   </vm>
-</acrn-config>
\ No newline at end of file
+</acrn-config>
diff --git a/misc/config_tools/data/whl-ipc-i5/shared_launch_1user_vm_hardrt.xml b/misc/config_tools/data/whl-ipc-i5/shared_launch_1user_vm_hardrt.xml
index 4ea1d1781..0601f10d9 100644
--- a/misc/config_tools/data/whl-ipc-i5/shared_launch_1user_vm_hardrt.xml
+++ b/misc/config_tools/data/whl-ipc-i5/shared_launch_1user_vm_hardrt.xml
@@ -58,6 +58,7 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
+    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <os_config>
       <kern_type>KERNEL_BZIMAGE</kern_type>
@@ -178,4 +179,4 @@
     <console_vuart>COM Port 1</console_vuart>
     <PTM>n</PTM>
   </vm>
-</acrn-config>
\ No newline at end of file
+</acrn-config>
diff --git a/misc/config_tools/data/whl-ipc-i5/shared_launch_1user_vm_vxworks.xml b/misc/config_tools/data/whl-ipc-i5/shared_launch_1user_vm_vxworks.xml
index 7b1e9ee13..6f0693f77 100644
--- a/misc/config_tools/data/whl-ipc-i5/shared_launch_1user_vm_vxworks.xml
+++ b/misc/config_tools/data/whl-ipc-i5/shared_launch_1user_vm_vxworks.xml
@@ -58,6 +58,7 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
+    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <os_config>
       <kern_type>KERNEL_BZIMAGE</kern_type>
@@ -179,4 +180,4 @@
     <console_vuart>COM Port 1</console_vuart>
     <PTM>n</PTM>
   </vm>
-</acrn-config>
\ No newline at end of file
+</acrn-config>
diff --git a/misc/config_tools/data/whl-ipc-i5/shared_launch_1user_vm_waag.xml b/misc/config_tools/data/whl-ipc-i5/shared_launch_1user_vm_waag.xml
index 62843d8da..95bdcaa4d 100644
--- a/misc/config_tools/data/whl-ipc-i5/shared_launch_1user_vm_waag.xml
+++ b/misc/config_tools/data/whl-ipc-i5/shared_launch_1user_vm_waag.xml
@@ -58,6 +58,7 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
+    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <os_config>
       <kern_type>KERNEL_BZIMAGE</kern_type>
@@ -179,4 +180,4 @@
     <console_vuart>COM Port 1</console_vuart>
     <PTM>n</PTM>
   </vm>
-</acrn-config>
\ No newline at end of file
+</acrn-config>
diff --git a/misc/config_tools/data/whl-ipc-i5/shared_launch_2user_vm.xml b/misc/config_tools/data/whl-ipc-i5/shared_launch_2user_vm.xml
index fbfe17478..4bd7de3c5 100644
--- a/misc/config_tools/data/whl-ipc-i5/shared_launch_2user_vm.xml
+++ b/misc/config_tools/data/whl-ipc-i5/shared_launch_2user_vm.xml
@@ -58,6 +58,7 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
+    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <os_config>
       <kern_type>KERNEL_BZIMAGE</kern_type>
@@ -198,4 +199,4 @@
     <console_vuart>COM Port 1</console_vuart>
     <PTM>n</PTM>
   </vm>
-</acrn-config>
\ No newline at end of file
+</acrn-config>
diff --git a/misc/config_tools/data/whl-ipc-i5/shared_launch_6user_vm.xml b/misc/config_tools/data/whl-ipc-i5/shared_launch_6user_vm.xml
index b330427fb..d0d614c07 100644
--- a/misc/config_tools/data/whl-ipc-i5/shared_launch_6user_vm.xml
+++ b/misc/config_tools/data/whl-ipc-i5/shared_launch_6user_vm.xml
@@ -58,6 +58,7 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
+    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <os_config>
       <kern_type>KERNEL_BZIMAGE</kern_type>
@@ -270,4 +271,4 @@
       <block>./YaaG.img</block>
     </virtio_devices>
   </vm>
-</acrn-config>
\ No newline at end of file
+</acrn-config>
diff --git a/misc/config_tools/schema/config.xsd b/misc/config_tools/schema/config.xsd
index 3054ed855..ba4abe94d 100644
--- a/misc/config_tools/schema/config.xsd
+++ b/misc/config_tools/schema/config.xsd
@@ -305,7 +305,7 @@ Refer to :ref:`vuart_config` for detailed vUART settings.</xs:documentation>
         <xs:documentation>Specify the name used to identify this VM. The VM name will be shown in the hypervisor console vm_list command.</xs:documentation>
       </xs:annotation>
     </xs:element>
-    <xs:element name="vm_type" type="VMType" minOccurs="0">
+    <xs:element name="vm_type" type="VMType">
       <xs:annotation acrn:title="VM type" acrn:views="basic">
         <xs:documentation>Select the VM type. A standard VM (``STANDARD_VM``) is for general-purpose applications, such as human-machine interface (HMI). A real-time VM (``RTVM``) offers special features for time-sensitive applications.</xs:documentation>
       </xs:annotation>