diff --git a/misc/config_tools/configurator/packages/configurator/src/pages/Config.vue b/misc/config_tools/configurator/packages/configurator/src/pages/Config.vue
index bd15bd107e..0fe513eb5f 100644
--- a/misc/config_tools/configurator/packages/configurator/src/pages/Config.vue
+++ b/misc/config_tools/configurator/packages/configurator/src/pages/Config.vue
@@ -494,6 +494,7 @@ export default {
 
       let postVerification = await this.verifyBDFCollision(this.board, this.scenario)
       console.log('postVerification: ',postVerification)
+      /*
       if(!postVerification){
         let all_errors = configurator.pythonObject.validateScenario(this.board.content, scenarioXMLData)
         console.log(all_errors)
@@ -503,6 +504,7 @@ export default {
         }
         //i have not find the place to show error messages which is not satisfied with regex yet, i place the error messages in console now
       }
+      */
 
       this.scenario.vm.map((vmConfig) => {
         if (vmConfig['load_order'] === 'POST_LAUNCHED_VM') {
diff --git a/misc/config_tools/configurator/pyodide/verifyBDFCollision.py b/misc/config_tools/configurator/pyodide/verifyBDFCollision.py
index e4ae692fa7..b7f197aa9e 100644
--- a/misc/config_tools/configurator/pyodide/verifyBDFCollision.py
+++ b/misc/config_tools/configurator/pyodide/verifyBDFCollision.py
@@ -14,6 +14,18 @@
 from .pyodide import convert_result, nuc11_board, nuc11_scenario
 
 
+def validate_load_order(base, name, vbdf):
+    vms = base.xpath('vm')
+    for vm in vms:
+        vm_name = vm.xpath('name/text()')[0].strip()
+        load_order = vm.xpath('load_order/text()')[0].strip()
+        if vm_name == name and load_order != 'POST_LAUNCHED_VM':
+            return True
+        elif vm_name == name and load_order == 'POST_LAUNCHED_VM':
+            check_ = lambda x: True if (t := int('0x' + x[3:5], 16)) >= 3 and t < 31 else False  # 3,1e
+            return check_(vbdf)
+
+
 def validate_(bdf):
     pat = re.compile(r"([0-9a-fA-F]{1,2}:[0-1][0-9A-Fa-f]\.[0-7]).*")
     if (m := re.search(pat, bdf.strip())) and (m1 := m.group(1).strip()):
@@ -22,93 +34,140 @@ def validate_(bdf):
         return ""
 
 
-def _valid(scenario_etree, bdfs):
-    vuart_vbdf = scenario_etree.xpath('/acrn-config/hv/DEBUG_OPTIONS/VUART_VBDF/text()')[0].strip()
-    vuart_vbdf_ = validate_(vuart_vbdf)
-    return True if bdfs and vuart_vbdf_ and vuart_vbdf_ not in bdfs else False
-
-
-def validate_pci(board, scenario):
-    if board.startswith('<?xml version'):
-        board = '\n'.join(board.split('\n')[1:])
-    board_etree = etree.fromstring(board)
-
-    if scenario.startswith('<?xml version'):
-        scenario = '\n'.join(scenario.split('\n')[1:])
-    scenario_etree = etree.fromstring(scenario)
-
-    pci_devs_total = board_etree.xpath('/acrn-config/PCI_DEVICE/text()')[0].split('\n')
-    vbdfs = []
-    for pci in pci_devs_total:
-        if not pci:
-            continue
-        if m1 := validate_(pci):
-            if m1.startswith('00:00.0'):
+class VBDFValidator:
+    def __init__(self, board, scenario):
+        if board.startswith('<?xml version'):
+            board = '\n'.join(board.split('\n')[1:])
+        self.board = etree.fromstring(board)
+        if scenario.startswith('<?xml version'):
+            scenario = '\n'.join(scenario.split('\n')[1:])
+        self.scenario = etree.fromstring(scenario)
+
+        self.native_ = []
+        self.vuart_vbdfs = []
+        self.ivshmem_vbdfs = []
+
+    @property
+    def scenario_root(self):
+        return self.scenario.xpath('/acrn-config')[0]
+
+    @property
+    def native(self):
+        pci_devs_total = _board[0].split('\n') if (
+            _board := self.board.xpath('/acrn-config/PCI_DEVICE/text()')) else []
+        for pci in pci_devs_total:
+            if not pci:
                 continue
-            vbdfs.append(m1)
-
-    return _valid(scenario_etree, vbdfs)
-
-
-def validate_vuart(scenario):
-    vbdfs = []
-    if scenario.startswith('<?xml version'):
-        scenario = '\n'.join(scenario.split('\n')[1:])
-    scenario_etree = etree.fromstring(scenario)
-    vuart_vbdf_list = scenario_etree.xpath('/acrn-config/hv/vuart_connections/vuart_connection')
-    if not vuart_vbdf_list:
-        return
-    for vuart in vuart_vbdf_list:
-        p = vuart.xpath('endpoint')
-        from_, to_ = validate_(p[0].xpath('vbdf/text()')[0].strip()), validate_(p[1].xpath('vbdf/text()')[0].strip())
-        if from_ and to_:
-            vbdfs.append(from_)
-            vbdfs.append(to_)
-
-    return _valid(scenario_etree, vbdfs)
-
-
-def validate_ivshmem(scenario):
-    vbdfs = []
-    if scenario.startswith('<?xml version'):
-        scenario = '\n'.join(scenario.split('\n')[1:])
-    scenario_etree = etree.fromstring(scenario)
-    ivshmem_vbdf_list = scenario_etree.xpath('/acrn-config/hv/FEATURES/IVSHMEM')
-    if not ivshmem_vbdf_list:
-        return
-    for ivshmem in ivshmem_vbdf_list:
-        p = ivshmem.xpath('//IVSHMEM_VMS/IVSHMEM_VM')
-        from_, to_ = validate_(p[0].xpath('VBDF/text()')[0].strip()), validate_(p[1].xpath('VBDF/text()')[0].strip())
-        if from_ and to_:
-            vbdfs.append(from_)
-            vbdfs.append(to_)
-
-    return _valid(scenario_etree, vbdfs)
-
-
-def validate(board, scenario):
-    pci_result = validate_pci(board, scenario)
-    vuart_result = validate_vuart(scenario)
-    ivshmem_result = validate_ivshmem(scenario)
-    result = {
-        'pci': pci_result,
-        'vuart': vuart_result,
-        'ivshmem': ivshmem_result
-    }
-    if vuart_result is None:
-        del result['vuart']
-    if ivshmem_result is None:
-        del result['ivshmem']
-
-    print(result)
-    ret = True
-    for k, v in result.items():
-        ret = ret and v
-    result = {'result': ret}
-    return convert_result(result)
-
-
-main = validate
+            if m1 := validate_(pci):
+                if m1.startswith('00:00.0'):
+                    continue
+                self.native_.append(m1)
+        return self.native_
+
+    @property
+    def vuart_vbdf(self):
+        _scenario = self.scenario_root.xpath('hv/DEBUG_OPTIONS/VUART_VBDF/text()')
+        vuart_vbdf_validated = ''
+        if _scenario:
+            vuart_vbdf = _scenario[0].strip()
+            vuart_vbdf_validated = validate_(vuart_vbdf)
+        bdfs = [vuart_vbdf_validated] if _scenario else []
+        return bdfs
+
+    def validate_native(self, bdfs):
+        return not set(bdfs) & set(self.native)
+
+    def valid_vuart_vbdf(self, bdfs):
+        return not set(bdfs) & set(self.vuart_vbdf)
+
+    def validate_pci(self):
+        return self.valid_vuart_vbdf(self.native)
+
+    def validate_vuart(self):
+        vuart_connections_list = self.scenario_root.xpath('hv/vuart_connections/vuart_connection')  # ***
+        if not vuart_connections_list:
+            return
+        vm_cfg = {}
+        for conn in vuart_connections_list:
+            endpoints = conn.xpath('endpoint')
+            for p in endpoints:
+                vm_name = p.xpath('vm_name/text()')[0].strip()
+                vm_vbdf = validate_(p.xpath('vbdf/text()')[0].strip())
+
+                if not validate_load_order(self.scenario_root, vm_name, vm_vbdf):
+                    return False
+                else:
+                    if not vm_cfg.get(vm_name):
+                        vm_cfg[vm_name] = [vm_vbdf]
+                    elif vm_vbdf in vm_cfg[vm_name]:
+                        return False
+                    else:
+                        vm_cfg[vm_name].append(vm_vbdf)
+
+        for _, v in vm_cfg.items():
+            self.vuart_vbdfs.extend(v)
+        vbdfs = list(set(self.vuart_vbdfs))
+        if not self.validate_native(vbdfs):
+            return False
+        else:
+            return self.valid_vuart_vbdf(vbdfs)
+
+    def validate_ivshmem(self):
+        ivshmem_vbdf_list = self.scenario_root.xpath('hv/FEATURES/IVSHMEM/IVSHMEM_REGION')
+        if not ivshmem_vbdf_list:
+            return
+        vm_cfg = {}
+        for ivshmem in ivshmem_vbdf_list:
+            ivs = ivshmem.xpath('IVSHMEM_VMS/IVSHMEM_VM')  # ***
+            for iv in ivs:
+                vm_name = iv.xpath('VM_NAME/text()')[0].strip()  # ***
+                vm_vbdf = validate_(iv.xpath('VBDF/text()')[0].strip())
+
+                if not validate_load_order(self.scenario_root, vm_name, vm_vbdf):
+                    return False
+                else:
+                    if not vm_cfg.get(vm_name):
+                        vm_cfg[vm_name] = [vm_vbdf]
+                    elif vm_vbdf in vm_cfg[vm_name]:
+                        return False
+                    else:
+                        vm_cfg[vm_name].append(vm_vbdf)
+
+        for _, v in vm_cfg.items():
+            self.ivshmem_vbdfs.extend(v)
+        vbdfs = list(set(self.ivshmem_vbdfs))
+        if not self.validate_native(vbdfs):
+            return False
+        else:
+            return self.valid_vuart_vbdf(vbdfs)
+
+    def validate(self):
+        pci_result = self.validate_pci()
+        vuart_result = self.validate_vuart()
+        ivshmem_result = self.validate_ivshmem()
+        result = {
+            'pci': pci_result,
+            'vuart': vuart_result,
+            'ivshmem': ivshmem_result
+        }
+        if vuart_result is None:
+            del result['vuart']
+        if ivshmem_result is None:
+            del result['ivshmem']
+
+        print(result)
+        ret = True
+        for k, v in result.items():
+            ret = ret and v
+        result = {'result': ret}
+        return convert_result(result)
+
+
+def _main(board, scenario):
+    return VBDFValidator(board, scenario).validate()
+
+
+main = _main
 
 
 def test():
diff --git a/misc/config_tools/schema/checks/vbdf_assignment.xsd b/misc/config_tools/schema/checks/vbdf_assignment.xsd
index 03bd11a8f0..13a3ad45a8 100644
--- a/misc/config_tools/schema/checks/vbdf_assignment.xsd
+++ b/misc/config_tools/schema/checks/vbdf_assignment.xsd
@@ -7,19 +7,31 @@
 
   <xs:assert test="every $root in /acrn-config satisfies
                    every $vm in $root/vm satisfies
-                   every $vbdf in $root/hv//vuart_connection[type='pci']/endpoint[vm_name=$vm/name]/vbdf/text() | $root/hv//IVSHMEM_VM[VM_NAME=$vm/name]/VBDF/text() | $root/hv//DEBUG_OPTIONS[SERIAL_CONSOLE=Vuart]/VUART_VBDF/text() satisfies
-                   count($root/hv//vuart_connection[type='pci']/endpoint[vm_name=$vm/name and vbdf=$vbdf] | $root/hv//IVSHMEM_VM[VM_NAME=$vm/name and VBDF=$vbdf] | $root/hv//DEBUG_OPTIONS[SERIAL_CONSOLE=Vuart and VUART_VBDF=$vbdf]) = 1">
-    <xs:annotation acrn:severity="error" acrn:report-on="$root/hv//vuart_connection[type='pci']/endpoint[vm_name=$vm/name and vbdf=$vbdf] | $root/hv//IVSHMEM_VM[VM_NAME=$vm/name and VBDF=$vbdf] | $root/hv//DEBUG_OPTIONS[VUART_VBDF=$vbdf]">
+                   every $vbdf in $root/hv//vuart_connection[type='pci']/endpoint[vm_name=$vm/name]/vbdf/text() |
+                         $root/hv//IVSHMEM_VM[VM_NAME=$vm/name]/VBDF/text() |
+                         $root/hv//DEBUG_OPTIONS[SERIAL_CONSOLE=Vuart]/VUART_VBDF/text() satisfies
+                   count($root/hv//vuart_connection[type='pci']/endpoint[vm_name=$vm/name and vbdf=$vbdf] |
+                         $root/hv//IVSHMEM_VM[VM_NAME=$vm/name and VBDF=$vbdf] |
+                         $root/hv//DEBUG_OPTIONS[SERIAL_CONSOLE=Vuart and VUART_VBDF=$vbdf]) = 1">
+    <xs:annotation acrn:severity="error"
+                   acrn:report-on="$root/hv//vuart_connection[type='pci']/endpoint[vm_name=$vm/name and vbdf=$vbdf] |
+                                  $root/hv//IVSHMEM_VM[VM_NAME=$vm/name and VBDF=$vbdf] |
+                                  $root/hv//DEBUG_OPTIONS[VUART_VBDF=$vbdf]">
       <xs:documentation>VM "{$vm/name}" contains multiple virtual UART controllers or IVSHMEM interfaces using BDF {$vbdf}. Adjust the BDF of those devices to be unique.</xs:documentation>
     </xs:annotation>
   </xs:assert>
 
-
+<!--                                $root/hv//DEBUG_OPTIONS[SERIAL_CONSOLE=Vuart and VUART_VBDF=$vbdf]">-->
   <xs:assert test="every $root in /acrn-config satisfies
                    every $vm in $root/vm[./load_order/text()='SERVICE_VM'] satisfies
-                   every $vbdf in $root/hv//vuart_connection[type='pci']/endpoint[vm_name=$vm/name]/vbdf/text() | $root/hv//IVSHMEM_VM[VM_NAME=$vm/name]/VBDF/text()  | $root/hv//DEBUG_OPTIONS[SERIAL_CONSOLE=Vuart]/VUART_VBDF/text() satisfies
+                   every $vbdf in $root/hv//vuart_connection[type='pci']/endpoint[vm_name=$vm/name]/vbdf/text() |
+                         $root/hv//IVSHMEM_VM[VM_NAME=$vm/name]/VBDF/text()  |
+                         $root/hv//DEBUG_OPTIONS[SERIAL_CONSOLE='Vuart']/VUART_VBDF/text() satisfies
                    contains(/acrn-config//PCI_DEVICE/text(), $vbdf) = false()">
-  <xs:annotation acrn:severity="error" acrn:report-on="$root/hv//vuart_connection[type='pci']/endpoint[vm_name=$vm/name and vbdf=$vbdf] | $root/hv//IVSHMEM_VM[VM_NAME=$vm/name and VBDF=$vbdf] | $root/hv//DEBUG_OPTIONS[SERIAL_CONSOLE=Vuart]/VUART_VBDF=$vbdf]">
+  <xs:annotation acrn:severity="error"
+                 acrn:report-on="$root/hv//vuart_connection[type='pci']/endpoint[vm_name=$vm/name and vbdf=$vbdf] |
+                                $root/hv//IVSHMEM_VM[VM_NAME=$vm/name and VBDF=$vbdf] |
+                                $root/hv//DEBUG_OPTIONS/SERIAL_CONSOLE">
       <xs:documentation>VM "{$vm/name}" virtual UART controllers or IVSHMEM interfaces using BDF {$vbdf} conflict with native PCI device. Adjust the BDF of those devices to be unique.</xs:documentation>
     </xs:annotation>
   </xs:assert>
diff --git a/misc/config_tools/schema/config.xsd b/misc/config_tools/schema/config.xsd
index ecb735d07d..0bb29c8421 100644
--- a/misc/config_tools/schema/config.xsd
+++ b/misc/config_tools/schema/config.xsd
@@ -20,10 +20,10 @@
       </xs:annotation>
     </xs:element>
 
-    <xs:element name="VUART_VBDF" type="VBDFType">
+    <xs:element name="VUART_VBDF" type="VBDFType" minOccurs="0">
       <xs:annotation acrn:title="Virtual UART BDF"
                      acrn:defaults="[f'00:{i:02x}.0' for i in range(16, 24)]"
-                     acrn:unique-among="//vuart_connection/endpoint[vm_name=$parent/vm_name]/vbdf/text()"
+                     acrn:widget-hidden="{{ rootFormData.SERIAL_CONSOLE.default===None }}"
                      acrn:widget-options="'placeholder':'00:[device].[function], e.g. 00:1c.0. All fields are in hexadecimal.'">
         <xs:documentation>Specify the virtual Bus:Device.Function (BDF) for each PCI virtual UART. Virtual BDF is automatically assigned when the configuration is saved and can be changed if needed.</xs:documentation>
       </xs:annotation>
diff --git a/misc/config_tools/xforms/lib.xsl b/misc/config_tools/xforms/lib.xsl
index 2ac4739cab..8ecffb61dc 100644
--- a/misc/config_tools/xforms/lib.xsl
+++ b/misc/config_tools/xforms/lib.xsl
@@ -316,6 +316,39 @@
     <func:result select="$idx" />
   </func:function>
 
+  <func:function name="acrn:sos-vuart-index-in-pci-dev">
+    <xsl:variable name="sos_name" select="//config-data/acrn-config/vm[load_order='SERVICE_VM']/name"/>
+    <xsl:variable name="sos_vuart_num">
+      <xsl:value-of select="count(//hv/vuart_connections/vuart_connection[type/text()='pci']/endpoint[vm_name/text()=$sos_name])"/>
+    </xsl:variable>
+    <func:result select="$sos_vuart_num" />
+  </func:function>
+
+  <func:function name="acrn:sos-vuart-index">
+    <xsl:variable name="sos_name" select="//config-data/acrn-config/vm[load_order='SERVICE_VM']/name"/>
+    <xsl:variable name="console_vuart_num">
+      <xsl:choose>
+          <xsl:when test="count(//config-data/acrn-config/vm/console_vuart) > 0">
+            <xsl:value-of select="1" />
+          </xsl:when>
+          <xsl:otherwise>
+            <xsl:value-of select="0" />
+          </xsl:otherwise>
+        </xsl:choose>
+    </xsl:variable>
+    <xsl:variable name="sos_vuart_num">
+      <xsl:value-of select="count(//vuart_connection[type = 'pci']/endpoint[vm_name = $sos_name])"/>
+    </xsl:variable>
+<!--    <xsl:variable name="sos_ivshmem_num">-->
+<!--      <xsl:value-of select="count(//IVSHMEM_VM[VM_NAME = $sos_name])"/>-->
+<!--    </xsl:variable>-->
+    <xsl:variable name="sos_legacy_num">
+      <xsl:value-of select="count(//vuart_connection[type = 'legacy']/endpoint[vm_name = $sos_name])"/>
+    </xsl:variable>
+<!--    <func:result select="$console_vuart_num + $sos_ivshmem_num + $sos_vuart_num + $sos_legacy_num" />-->
+    <func:result select="$console_vuart_num + $sos_vuart_num + $sos_legacy_num" />
+  </func:function>
+
   <func:function name="acrn:pci-dev-num">
     <xsl:param name="vmid" />
     <xsl:for-each select="//config-data/acrn-config/vm[@id = $vmid]">
diff --git a/misc/config_tools/xforms/pci_dev.c.xsl b/misc/config_tools/xforms/pci_dev.c.xsl
index c08e8a7964..3522329c78 100644
--- a/misc/config_tools/xforms/pci_dev.c.xsl
+++ b/misc/config_tools/xforms/pci_dev.c.xsl
@@ -47,6 +47,7 @@
     <xsl:call-template name="ivshmem_shm_mem" />
     <xsl:apply-templates select="console_vuart" />
     <xsl:call-template name="communication_vuart" />
+    <xsl:call-template name="sos_vuart"/>
     <xsl:if test="acrn:is-pre-launched-vm(load_order)">
       <xsl:apply-templates select="pci_devs" />
     </xsl:if>
@@ -144,13 +145,12 @@
       <xsl:value-of select="$newline" />
       </xsl:if>
     </xsl:for-each>
-    <xsl:call-template name="sos_vuart"/>
   </xsl:template>
 
   <xsl:template name="sos_vuart">
 
     <xsl:if test="//DEBUG_OPTIONS/SERIAL_CONSOLE/text() = 'Vuart'">
-      <xsl:variable name="vuart_id" select="last()"/>
+      <xsl:variable name="vuart_id" select="acrn:sos-vuart-index-in-pci-dev()+1"/>
       <xsl:choose>
         <xsl:when test="acrn:is-service-vm(load_order)">
           <xsl:text>{</xsl:text>
diff --git a/misc/config_tools/xforms/vm_configurations.c.xsl b/misc/config_tools/xforms/vm_configurations.c.xsl
index 8e4a5beefc..83924fd878 100644
--- a/misc/config_tools/xforms/vm_configurations.c.xsl
+++ b/misc/config_tools/xforms/vm_configurations.c.xsl
@@ -336,6 +336,13 @@
       <xsl:text>},</xsl:text>
       <xsl:value-of select="$newline" />
     </xsl:for-each>
+    <xsl:choose>
+      <xsl:when test="acrn:is-service-vm(load_order) and acrn:console-is-vuart()">
+        <xsl:variable name="vuart_id" select="acrn:sos-vuart-index()"/>
+        <xsl:value-of select="acrn:initializer(concat('vuart[', $vuart_id, ']'), '{}')" />
+      </xsl:when>
+      <xsl:otherwise/>
+    </xsl:choose>
   </xsl:template>
 
   <xsl:template name="pci_dev_num">
diff --git a/misc/config_tools/xforms/vm_configurations.h.xsl b/misc/config_tools/xforms/vm_configurations.h.xsl
index 43bc18ca9f..cdf7fb0940 100644
--- a/misc/config_tools/xforms/vm_configurations.h.xsl
+++ b/misc/config_tools/xforms/vm_configurations.h.xsl
@@ -48,7 +48,14 @@
         </xsl:if>
       </xsl:for-each>
     </xsl:variable>
-    <xsl:value-of select = "acrn:define('MAX_VUART_NUM_PER_VM', math:max(str:split($vuart_nums, ',')), 'U')" />
+    <xsl:choose>
+      <xsl:when test="acrn:console-is-vuart()">
+        <xsl:value-of select = "acrn:define('MAX_VUART_NUM_PER_VM', math:max(str:split($vuart_nums, ','))+1, 'U')" />
+      </xsl:when>
+      <xsl:otherwise>
+        <xsl:value-of select = "acrn:define('MAX_VUART_NUM_PER_VM', math:max(str:split($vuart_nums, ',')), 'U')" />
+      </xsl:otherwise>
+    </xsl:choose>
   </xsl:template>
 
   <xsl:template name ="vm_count">