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 247add19a..5e4052063 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
@@ -101,7 +101,6 @@
   </vm>
   <vm id="1">
     <load_order>SERVICE_VM</load_order>
-    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <cpu_affinity>
       <pcpu>
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 03a2055f9..d5fd9690a 100644
--- a/misc/config_tools/data/cfl-k700-i7/hybrid_rt.xml
+++ b/misc/config_tools/data/cfl-k700-i7/hybrid_rt.xml
@@ -121,7 +121,6 @@
   </vm>
   <vm id="1">
     <load_order>SERVICE_VM</load_order>
-    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <cpu_affinity>
       <pcpu>
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 254b48d07..3c3f58918 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
@@ -58,7 +58,6 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
-    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <clos>
       <vcpu_clos>0</vcpu_clos>
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 75e4008a9..fea9a5e28 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
@@ -102,7 +102,6 @@
   </vm>
   <vm id="1">
     <load_order>SERVICE_VM</load_order>
-    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <cpu_affinity>
       <pcpu>
diff --git a/misc/config_tools/data/generic_board/hybrid_rt.xml b/misc/config_tools/data/generic_board/hybrid_rt.xml
index c5ae43494..f7bc614a1 100644
--- a/misc/config_tools/data/generic_board/hybrid_rt.xml
+++ b/misc/config_tools/data/generic_board/hybrid_rt.xml
@@ -131,7 +131,6 @@
   </vm>
   <vm id="1">
     <load_order>SERVICE_VM</load_order>
-    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <cpu_affinity>
       <pcpu>
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 d4ae3d096..0ca540359 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
@@ -66,7 +66,6 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
-    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <clos>
       <vcpu_clos>0</vcpu_clos>
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 8e202ad0b..b2783fd6e 100644
--- a/misc/config_tools/data/nuc11tnbi5/hybrid_launch_2user_vm.xml
+++ b/misc/config_tools/data/nuc11tnbi5/hybrid_launch_2user_vm.xml
@@ -102,7 +102,6 @@
   </vm>
   <vm id="1">
     <load_order>SERVICE_VM</load_order>
-    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <cpu_affinity>
       <pcpu>
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 66df7202f..078669eed 100644
--- a/misc/config_tools/data/nuc11tnbi5/shared_launch_6user_vm.xml
+++ b/misc/config_tools/data/nuc11tnbi5/shared_launch_6user_vm.xml
@@ -78,7 +78,6 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
-    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <clos>
       <vcpu_clos>0</vcpu_clos>
diff --git a/misc/config_tools/data/qemu/shared.xml b/misc/config_tools/data/qemu/shared.xml
index 1121583b9..5b1a0a88f 100644
--- a/misc/config_tools/data/qemu/shared.xml
+++ b/misc/config_tools/data/qemu/shared.xml
@@ -59,7 +59,6 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
-    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <clos>
       <vcpu_clos>0</vcpu_clos>
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 3235af215..c06d88cc5 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
@@ -102,7 +102,6 @@
   </vm>
   <vm id="1">
     <load_order>SERVICE_VM</load_order>
-    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <cpu_affinity>
       <pcpu>
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 360867116..28410ca9d 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
@@ -78,7 +78,6 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
-    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <clos>
       <vcpu_clos>0</vcpu_clos>
diff --git a/misc/config_tools/data/whl-ipc-i5/hybrid.xml b/misc/config_tools/data/whl-ipc-i5/hybrid.xml
index ce18ce119..50a881654 100644
--- a/misc/config_tools/data/whl-ipc-i5/hybrid.xml
+++ b/misc/config_tools/data/whl-ipc-i5/hybrid.xml
@@ -92,7 +92,6 @@
   </vm>
   <vm id="1">
     <load_order>SERVICE_VM</load_order>
-    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <cpu_affinity>
       <pcpu>
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 d3981b413..de17b8023 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
@@ -121,7 +121,6 @@
   </vm>
   <vm id="1">
     <load_order>SERVICE_VM</load_order>
-    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <cpu_affinity>
       <pcpu>
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 edbd68208..abfcf029c 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
@@ -58,7 +58,6 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
-    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <clos>
       <vcpu_clos>0</vcpu_clos>
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 4194651f4..cd3abceb3 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
@@ -58,7 +58,6 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
-    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <clos>
       <vcpu_clos>0</vcpu_clos>
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 ae26a51db..197a1034a 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
@@ -58,7 +58,6 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
-    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <clos>
       <vcpu_clos>0</vcpu_clos>
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 a1502170d..a08bec9ff 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
@@ -58,7 +58,6 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
-    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <clos>
       <vcpu_clos>0</vcpu_clos>
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 c7f9d7d7c..d1bebb300 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
@@ -58,7 +58,6 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
-    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <clos>
       <vcpu_clos>0</vcpu_clos>
diff --git a/misc/config_tools/schema/VMtypes.xsd b/misc/config_tools/schema/VMtypes.xsd
index 674ba6551..b19a66289 100644
--- a/misc/config_tools/schema/VMtypes.xsd
+++ b/misc/config_tools/schema/VMtypes.xsd
@@ -138,7 +138,7 @@ The size is a subset of the VM's total memory size specified on the Basic tab.</
         <xs:documentation>Select the kernel image type so that the hypervisor can load it correctly.</xs:documentation>
       </xs:annotation>
     </xs:element>
-    <xs:element name="kern_mod" type="xs:string">
+    <xs:element name="kern_mod" type="xs:string" minOccurs="0">
       <xs:annotation acrn:title="Kernel module tag">
         <xs:documentation>Specify the tag for the kernel image that is used as a multiboot module. The tag's spelling must exactly match the module tag in the GRUB multiboot cmdline.</xs:documentation>
       </xs:annotation>
@@ -154,12 +154,12 @@ The size is a subset of the VM's total memory size specified on the Basic tab.</
       </xs:annotation>
     </xs:element>
     <xs:element name="kern_load_addr" type="KernLoadAddr" minOccurs="0">
-      <xs:annotation>
+      <xs:annotation acrn:views="">
         <xs:documentation>The loading address in host memory for the VM kernel.</xs:documentation>
       </xs:annotation>
     </xs:element>
     <xs:element name="kern_entry_addr" type="KernEntryAddr" minOccurs="0">
-      <xs:annotation>
+      <xs:annotation acrn:views="">
         <xs:documentation>The entry address in host memory for the VM kernel.</xs:documentation>
       </xs:annotation>
     </xs:element>
@@ -253,7 +253,7 @@ The size is a subset of the VM's total memory size specified on the Basic tab.</
 <xs:complexType name="MMIOResourcesConfiguration">
   <xs:all>
     <xs:element name="TPM2" type="Boolean" default="n" minOccurs="0">
-      <xs:annotation acrn:title="TPM2 passthrough" acrn:applicable-vms="pre-launched, post-launched">
+      <xs:annotation acrn:title="TPM2 passthrough" acrn:applicable-vms="pre-launched">
         <xs:documentation>Enable passthrough of the trusted platform module (TPM2) device to this VM.</xs:documentation>
       </xs:annotation>
     </xs:element>
diff --git a/misc/config_tools/schema/config.xsd b/misc/config_tools/schema/config.xsd
index 3d4884e46..bb885a9aa 100644
--- a/misc/config_tools/schema/config.xsd
+++ b/misc/config_tools/schema/config.xsd
@@ -287,7 +287,7 @@ Refer to :ref:`vuart_config` for detailed vUART settings.</xs:documentation>
         <xs:documentation>Specify the load_order.</xs:documentation>
       </xs:annotation>
     </xs:element>
-    <xs:element name="vm_type" type="VMType">
+    <xs:element name="vm_type" type="VMType" minOccurs="0">
       <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>
@@ -374,7 +374,7 @@ Refer SDM 17.19.2 for details, and use with caution.</xs:documentation>
       </xs:annotation>
     </xs:element>
     <xs:element name="os_config" type="OSConfigurations" minOccurs="0">
-      <xs:annotation acrn:applicable-vms="pre-launched, service-vm" acrn:views="basic">
+      <xs:annotation acrn:title="OS Configuration" acrn:applicable-vms="pre-launched, service-vm" acrn:views="basic">
         <xs:documentation>General information for host kernel, boot
 argument and memory.</xs:documentation>
       </xs:annotation>
@@ -390,7 +390,7 @@ argument and memory.</xs:documentation>
       </xs:annotation>
     </xs:element>
     <xs:element name="pt_intx" type="xs:string" minOccurs="0">
-      <xs:annotation acrn:applicable-vms="pre-launched" acrn:views="advanced">
+      <xs:annotation acrn:applicable-vms="pre-launched" acrn:views="">
         <xs:documentation>Specify the pre-launched VM owned IOAPIC pins and the corresponding mapping between physical GSI and virtual GSI.</xs:documentation>
       </xs:annotation>
     </xs:element>