diff --git a/misc/config_tools/schema/VMtypes.xsd b/misc/config_tools/schema/VMtypes.xsd
index 5deea6479..f98c068d4 100644
--- a/misc/config_tools/schema/VMtypes.xsd
+++ b/misc/config_tools/schema/VMtypes.xsd
@@ -118,10 +118,18 @@ The size is a subset of the VM's total memory size specified on the Basic tab.</
 
 <xs:complexType name="MemoryInfo">
   <xs:all>
-    <xs:element name="size" type="xs:integer" minOccurs="0" default="256">
+    <xs:element name="size" minOccurs="0" default="256">
       <xs:annotation acrn:title="Memory size (MB)" acrn:views="basic" acrn:applicable-vms="pre-launched, post-launched">
        <xs:documentation>Specify the physical memory size allocated to this VM in megabytes.</xs:documentation>
       </xs:annotation>
+      <xs:simpleType>
+        <xs:annotation>
+          <xs:documentation>Integer value is not below zero.</xs:documentation>
+        </xs:annotation>
+        <xs:restriction base="xs:integer">
+          <xs:minInclusive value="0" />
+        </xs:restriction>
+      </xs:simpleType>
     </xs:element>
     <xs:element name="hpa_region" type="HPARegionType" minOccurs="0" maxOccurs="unbounded">
       <xs:annotation acrn:title="Physical memory segmentation" acrn:views="advanced" acrn:applicable-vms="pre-launched" >
diff --git a/misc/config_tools/schema/config.xsd b/misc/config_tools/schema/config.xsd
index 0ff6c89b9..68cc575c6 100644
--- a/misc/config_tools/schema/config.xsd
+++ b/misc/config_tools/schema/config.xsd
@@ -198,10 +198,19 @@ These settings can only be changed at build time.</xs:documentation>
         </xs:restriction>
       </xs:simpleType>
     </xs:element>
-    <xs:element name="MAX_PT_IRQ_ENTRIES" type="xs:integer" default="256">
+    <xs:element name="MAX_PT_IRQ_ENTRIES" default="256">
       <xs:annotation acrn:title="Max passthrough IRQ entries" acrn:views="advanced">
         <xs:documentation>Specify the maximum number of interrupt request (IRQ) entries from all passthrough devices.</xs:documentation>
       </xs:annotation>
+      <xs:simpleType>
+         <xs:annotation>
+           <xs:documentation>Integer from 1 to 1024.</xs:documentation>
+         </xs:annotation>
+        <xs:restriction base="xs:integer">
+          <xs:minInclusive value="1" />
+          <xs:maxInclusive value="1024" />
+        </xs:restriction>
+      </xs:simpleType>
     </xs:element>
     <xs:element name="MAX_MSIX_TABLE_NUM" default="64">
         <xs:annotation acrn:title="Max MSI-X tables" acrn:views="advanced">