diff --git a/misc/config_tools/library/scenario_cfg_lib.py b/misc/config_tools/library/scenario_cfg_lib.py
index 6ca69bcde..4a2be7cd2 100644
--- a/misc/config_tools/library/scenario_cfg_lib.py
+++ b/misc/config_tools/library/scenario_cfg_lib.py
@@ -18,8 +18,8 @@ KERN_BOOT_ADDR_LIST = ['0x100000']
 
 VUART_TYPE = ['VUART_LEGACY_PIO', 'VUART_PCI']
 INVALID_COM_BASE = 'INVALID_COM_BASE'
-VUART_BASE = ['SOS_COM1_BASE', 'SOS_COM2_BASE', 'COM1_BASE',
-              'COM2_BASE', 'COM3_BASE', 'COM4_BASE', INVALID_COM_BASE]
+VUART_BASE = ['SOS_COM1_BASE', 'SOS_COM2_BASE', 'SOS_COM3_BASE', 'SOS_COM4_BASE', 'COM1_BASE',
+              'COM2_BASE', 'COM3_BASE', 'COM4_BASE', 'CONFIG_COM_BASE', INVALID_COM_BASE]
 INVALID_PCI_BASE = 'INVALID_PCI_BASE'
 PCI_VUART = 'PCI_VUART'
 PCI_VUART_BASE = [PCI_VUART, INVALID_PCI_BASE]
@@ -27,8 +27,8 @@ PCI_VUART_BASE = [PCI_VUART, INVALID_PCI_BASE]
 AVALIBLE_COM1_BASE = [INVALID_COM_BASE, 'COM1_BASE']
 AVALIBLE_COM2_BASE = [INVALID_COM_BASE, 'COM2_BASE']
 
-VUART_IRQ = ['SOS_COM1_IRQ', 'SOS_COM2_IRQ', 'COM1_IRQ', 'COM2_IRQ', 'COM3_IRQ',
-             'COM4_IRQ', 'CONFIG_COM_IRQ', '3', '4', '6', '7']
+VUART_IRQ = ['SOS_COM1_IRQ', 'SOS_COM2_IRQ', 'SOS_COM3_IRQ', 'SOS_COM4_IRQ',
+             'COM1_IRQ', 'COM2_IRQ', 'COM3_IRQ', 'COM4_IRQ', 'CONFIG_COM_IRQ']
 
 # Support 512M, 1G, 2G
 # pre launch less then 2G, sos vm less than 24G
diff --git a/misc/config_tools/schema/VMtypes.xsd b/misc/config_tools/schema/VMtypes.xsd
index 6893a7dc2..f05ef821a 100644
--- a/misc/config_tools/schema/VMtypes.xsd
+++ b/misc/config_tools/schema/VMtypes.xsd
@@ -218,16 +218,20 @@ must exactly match the module tag in the GRUB multiboot cmdline.</xs:documentati
 <xs:simpleType name="LegacyVuartBase">
   <xs:annotation>
     <xs:documentation>A string with either ``SOS_COM1_BASE``,
-``SOS_COM2_BASE``, ``COM1_BASE``, ``COM2_BASE``, ``COM3_BASE``,
-``COM4_BASE``, or indicating it's disabled with ``INVALID_COM_BASE``.</xs:documentation>
+``SOS_COM2_BASE``, ``SOS_COM3_BASE``, ``SOS_COM4_BASE``,
+``COM1_BASE``, ``COM2_BASE``, ``COM3_BASE``, ``COM4_BASE``,
+``CONFIG_COM_BASE``, or indicating it's disabled with ``INVALID_COM_BASE``.</xs:documentation>
   </xs:annotation>
   <xs:restriction base="xs:string">
     <xs:enumeration value="SOS_COM1_BASE" />
     <xs:enumeration value="SOS_COM2_BASE" />
+    <xs:enumeration value="SOS_COM3_BASE" />
+    <xs:enumeration value="SOS_COM4_BASE" />
     <xs:enumeration value="COM1_BASE" />
     <xs:enumeration value="COM2_BASE" />
     <xs:enumeration value="COM3_BASE" />
     <xs:enumeration value="COM4_BASE" />
+    <xs:enumeration value="CONFIG_COM_BASE" />
     <xs:enumeration value="INVALID_COM_BASE" />
   </xs:restriction>
 </xs:simpleType>
@@ -235,21 +239,20 @@ must exactly match the module tag in the GRUB multiboot cmdline.</xs:documentati
 <xs:simpleType name="LegacyVuartIrq">
   <xs:annotation acrn:configurable="n">
     <xs:documentation>A string with either ``SOS_COM1_IRQ``,
-``SOS_COM2_IRQ``, ``COM1_IRQ``, ``COM2_IRQ``, ``COM3_IRQ``,
-``COM4_IRQ``, ``CONFIG_COM_IRQ``, ``3``, ``4``, ``6``, or ``7``.</xs:documentation>
+``SOS_COM2_IRQ``, ``SOS_COM3_IRQ``, ``SOS_COM4_IRQ``,
+``COM1_IRQ``, ``COM2_IRQ``, ``COM3_IRQ``, ``COM4_IRQ``
+or ``CONFIG_COM_IRQ``.</xs:documentation>
   </xs:annotation>
   <xs:restriction base="xs:string">
     <xs:enumeration value="SOS_COM1_IRQ" />
     <xs:enumeration value="SOS_COM2_IRQ" />
+    <xs:enumeration value="SOS_COM3_IRQ" />
+    <xs:enumeration value="SOS_COM4_IRQ" />
     <xs:enumeration value="COM1_IRQ" />
     <xs:enumeration value="COM2_IRQ" />
     <xs:enumeration value="COM3_IRQ" />
     <xs:enumeration value="COM4_IRQ" />
     <xs:enumeration value="CONFIG_COM_IRQ" />
-    <xs:enumeration value="3" />
-    <xs:enumeration value="4" />
-    <xs:enumeration value="6" />
-    <xs:enumeration value="7" />
   </xs:restriction>
 </xs:simpleType>
 
diff --git a/misc/config_tools/schema/config.xsd b/misc/config_tools/schema/config.xsd
index 91ebcaa7d..36b44fb28 100644
--- a/misc/config_tools/schema/config.xsd
+++ b/misc/config_tools/schema/config.xsd
@@ -411,7 +411,7 @@ Refer SDM 17.19.2 for details, and use with caution.</xs:documentation>
 argument and memory.</xs:documentation>
       </xs:annotation>
     </xs:element>
-    <xs:element name="legacy_vuart" type="LegacyVuartConfiguration" minOccurs="2" maxOccurs="2">
+    <xs:element name="legacy_vuart" type="LegacyVuartConfiguration" minOccurs="2" maxOccurs="8">
       <xs:annotation>
         <xs:documentation>Specify the vUART (aka COM) with the vUART ID by its ``id`` attribute.
 Refer to :ref:`vuart_config` for detailed vUART settings.</xs:documentation>
diff --git a/misc/config_tools/static_allocators/intx.py b/misc/config_tools/static_allocators/intx.py
index ff586afc9..c24231d22 100644
--- a/misc/config_tools/static_allocators/intx.py
+++ b/misc/config_tools/static_allocators/intx.py
@@ -31,47 +31,62 @@ def alloc_irq(irq_list):
         remove_irq(irq_list, irq)
         return irq
     except IndexError as e:
-        raise lib.error.ResourceError("Cannot allocate legacy irq, the available legacy irq list: {}, {}".format(e, irq_list)) from e
+        raise lib.error.ResourceError("Cannot allocate legacy irq, the available irq list: {}, {}".format(e, irq_list)) from e
 
 def remove_irq(irq_list, irq):
     try:
         irq_list.remove(irq)
     except ValueError as e:
-        raise ValueError("Cannot remove irq:{} from available legacy irq list:{}, {}". format(irq, e, irq_list)) from e
+        raise ValueError("Cannot remove irq:{} from available irq list:{}, {}". format(irq, e, irq_list)) from e
 
-def create_vuart_irq_node(etree, vm_id, vuart_id, irq):
-    allocation_sos_vm_node = common.get_node(f"/acrn-config/vm[@id = '{vm_id}']", etree)
-    if allocation_sos_vm_node is None:
-        allocation_sos_vm_node = common.append_node("/acrn-config/vm", None, etree, id = vm_id)
-    if common.get_node("./vm_type", allocation_sos_vm_node) is None:
-        common.append_node("./vm_type", "SOS_VM", allocation_sos_vm_node)
-    if common.get_node(f"./legacy_vuart[@id = '{vuart_id}']", allocation_sos_vm_node) is None:
-        common.append_node("./legacy_vuart", None, allocation_sos_vm_node, id = vuart_id)
+def create_vuart_irq_node(etree, vm_id, vm_type, vuart_id, irq):
+    allocation_vm_node = common.get_node(f"/acrn-config/vm[@id = '{vm_id}']", etree)
+    if allocation_vm_node is None:
+        allocation_vm_node = common.append_node("/acrn-config/vm", None, etree, id = vm_id)
+    if common.get_node("./vm_type", allocation_vm_node) is None:
+        common.append_node("./vm_type", vm_type, allocation_vm_node)
+    if common.get_node(f"./legacy_vuart[@id = '{vuart_id}']", allocation_vm_node) is None:
+        common.append_node("./legacy_vuart", None, allocation_vm_node, id = vuart_id)
 
-    common.append_node(f"./legacy_vuart[@id = '{vuart_id}']/irq", irq, allocation_sos_vm_node)
+    common.append_node(f"./legacy_vuart[@id = '{vuart_id}']/irq", irq, allocation_vm_node)
 
-def alloc_sos_vuart_irqs(board_etree, scenario_etree, allocation_etree):
-    irq_list = get_native_valid_irq()
-    hv_debug_console = lib.lib.parse_hv_console(scenario_etree)
+def alloc_legacy_vuart_irqs(board_etree, scenario_etree, allocation_etree):
     native_ttys = lib.lib.get_native_ttys()
-    vuart_valid = ['ttyS0', 'ttyS1', 'ttyS2', 'ttyS3']
+    hv_debug_console = lib.lib.parse_hv_console(scenario_etree)
 
-    scenario_sos_vm_node = common.get_node("//vm[vm_type = 'SOS_VM']", scenario_etree)
-    if scenario_sos_vm_node is not None:
-        vm_id = common.get_node("./@id", scenario_sos_vm_node)
-        if common.get_node("./legacy_vuart[@id = '0']/base/text()", scenario_sos_vm_node) != "INVALID_COM_BASE":
-            vuart0_irq = -1
-            if hv_debug_console in vuart_valid and hv_debug_console in native_ttys.keys() and native_ttys[hv_debug_console]['irq'] < LEGACY_IRQ_MAX:
-                vuart0_irq = native_ttys[hv_debug_console]['irq']
+    vm_node_list = scenario_etree.xpath("//vm")
+    for vm_node in vm_node_list:
+        vm_type = common.get_node("./vm_type/text()", vm_node)
+        irq_list = get_native_valid_irq() if vm_type == "SOS_VM" else [f"{d}" for d in list(range(1,15))]
+        legacy_vuart_id_list = vm_node.xpath("legacy_vuart[base != 'INVALID_COM_BASE']/@id")
+        legacy_vuart_irq = -1
+        for legacy_vuart_id in legacy_vuart_id_list:
+            if legacy_vuart_id == '0' and vm_type == "SOS_VM":
+                if hv_debug_console in native_ttys.keys():
+                    if native_ttys[hv_debug_console]['irq'] < LEGACY_IRQ_MAX:
+                        legacy_vuart_irq = native_ttys[hv_debug_console]['irq']
+                        if legacy_vuart_irq in irq_list:
+                            remove_irq(irq_list, legacy_vuart_irq)
+                    else:
+                        legacy_vuart_irq = alloc_irq(irq_list)
+                else:
+                    raise lib.error.ResourceError(f"{hv_debug_console} is not in the native environment! The ttyS available are: {native_ttys.keys()}")
             else:
-                vuart0_irq = alloc_irq(irq_list)
+                legacy_vuart_node_irq_text = common.get_node(f"legacy_vuart[@id = '{legacy_vuart_id}']/irq/text()", vm_node)
+                if legacy_vuart_node_irq_text == 'COM1_IRQ' or legacy_vuart_node_irq_text == 'SOS_COM1_IRQ' \
+                    or legacy_vuart_node_irq_text == 'COM3_IRQ' or legacy_vuart_node_irq_text == 'SOS_COM3_IRQ':
+                    legacy_vuart_irq = '4'
+                    if legacy_vuart_irq in irq_list:
+                        remove_irq(irq_list, legacy_vuart_irq)
+                elif legacy_vuart_node_irq_text == 'COM2_IRQ' or legacy_vuart_node_irq_text == 'SOS_COM2_IRQ' \
+                    or legacy_vuart_node_irq_text == 'COM4_IRQ' or legacy_vuart_node_irq_text == 'SOS_COM4_IRQ':
+                    legacy_vuart_irq = '3'
+                    if legacy_vuart_irq in irq_list:
+                        remove_irq(irq_list, legacy_vuart_irq)
+                else:
+                    legacy_vuart_irq = alloc_irq(irq_list)
 
-            create_vuart_irq_node(allocation_etree, vm_id, "0", vuart0_irq)
-
-        if common.get_node("./legacy_vuart[@id = '1']/base/text()", scenario_sos_vm_node) != "INVALID_COM_BASE":
-            vuart1_irq = alloc_irq(irq_list)
-
-            create_vuart_irq_node(allocation_etree, vm_id, "1", vuart1_irq)
+            create_vuart_irq_node(allocation_etree, common.get_node("./@id", vm_node), vm_type, legacy_vuart_id, legacy_vuart_irq)
 
 def get_irqs_of_device(device_node):
     irqs = set()
@@ -200,5 +215,5 @@ def alloc_device_irqs(board_etree, scenario_etree, allocation_etree):
                     pt_intx_node.text += f" ({irq}, {virq})"
 
 def fn(board_etree, scenario_etree, allocation_etree):
-    alloc_sos_vuart_irqs(board_etree, scenario_etree, allocation_etree)
+    alloc_legacy_vuart_irqs(board_etree, scenario_etree, allocation_etree)
     alloc_device_irqs(board_etree, scenario_etree, allocation_etree)
diff --git a/misc/config_tools/static_allocators/pio.py b/misc/config_tools/static_allocators/pio.py
index 5c6310d42..0ddf6c929 100644
--- a/misc/config_tools/static_allocators/pio.py
+++ b/misc/config_tools/static_allocators/pio.py
@@ -5,11 +5,11 @@
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
-import sys, os
+import sys, os, logging
 sys.path.append(os.path.join(os.path.dirname(os.path.abspath(__file__)), '..', 'library'))
 import common, lib.lib
 
-VALID_PIO = ['0x3F8', '0x2F8', '0x3E8', '0x2E8']
+VALID_PIO = ['0xA000', '0xA010', '0xA020', '0xA030', '0xA040', '0xA050', '0xA060', '0xA070']
 
 def alloc_pio(pio_list):
     try:
@@ -25,50 +25,47 @@ def remove_pio(pio_list, base):
     except ValueError as e:
         raise ValueError("Cannot remove a pio base:{} from the available pio base list:{}, {}". format(base, e, pio_list)) from e
 
-def create_vuart_base_node(etree, vm_id, vuart_id, vuart_base):
-    allocation_sos_vm_node = common.get_node(f"/acrn-config/vm[@id = '{vm_id}']", etree)
-    if allocation_sos_vm_node is None:
-        allocation_sos_vm_node = common.append_node("/acrn-config/vm", None, etree, id = vm_id)
-    if common.get_node("./vm_type", allocation_sos_vm_node) is None:
-        common.append_node("./vm_type", "SOS_VM", allocation_sos_vm_node)
-    if common.get_node(f"./legacy_vuart[@id = '{vuart_id}']", allocation_sos_vm_node) is None:
-        common.append_node("./legacy_vuart", None, allocation_sos_vm_node, id = vuart_id)
+def create_vuart_base_node(etree, vm_id, vm_type, vuart_id, vuart_base):
+    allocation_vm_node = common.get_node(f"/acrn-config/vm[@id = '{vm_id}']", etree)
+    if allocation_vm_node is None:
+        allocation_vm_node = common.append_node("/acrn-config/vm", None, etree, id = vm_id)
+    if common.get_node("./vm_type", allocation_vm_node) is None:
+        common.append_node("./vm_type", vm_type, allocation_vm_node)
+    if common.get_node(f"./legacy_vuart[@id = '{vuart_id}']", allocation_vm_node) is None:
+        common.append_node("./legacy_vuart", None, allocation_vm_node, id = vuart_id)
 
-    common.append_node(f"./legacy_vuart[@id = '{vuart_id}']/base", vuart_base, allocation_sos_vm_node)
+    common.append_node(f"./legacy_vuart[@id = '{vuart_id}']/base", vuart_base, allocation_vm_node)
 
 def fn(board_etree, scenario_etree, allocation_etree):
     native_ttys = lib.lib.get_native_ttys()
-    pio_list = [base for base in VALID_PIO if all(native_ttys[tty]['base'] != base for tty in native_ttys.keys())]
-    # This pio_list is workaround. Since there are whl-ipc-i7 and whl-ipc-i5 which occupy all valid pio ports.
-    # It would fail to allocate pio base for enabled sos legacy vuart1. In that case, we allow vuart1 take one pio
-    # base which is used in native.
-    full = False
-    if len(pio_list) == 0:
-        full = True
-        pio_list = VALID_PIO
-
-    vuart_valid = ['ttyS0', 'ttyS1', 'ttyS2', 'ttyS3']
     hv_debug_console = lib.lib.parse_hv_console(scenario_etree)
 
-    scenario_sos_vm_node = common.get_node("//vm[vm_type = 'SOS_VM']", scenario_etree)
-    if scenario_sos_vm_node is not None:
-        vm_id = common.get_node("./@id", scenario_sos_vm_node)
-        if common.get_node("./legacy_vuart[@id = '0']/base/text()", scenario_sos_vm_node) != "INVALID_COM_BASE":
-            vuart0_base = ""
-            if hv_debug_console in vuart_valid and hv_debug_console in native_ttys.keys() and native_ttys[hv_debug_console]['type'] == "portio":
-                vuart0_base = native_ttys[hv_debug_console]['base']
-                if vuart0_base in pio_list:
-                    remove_pio(pio_list, vuart0_base)
+    vm_node_list = scenario_etree.xpath("//vm")
+    for vm_node in vm_node_list:
+        vm_type = common.get_node("./vm_type/text()", vm_node)
+        pio_list = [base for base in VALID_PIO if all(native_ttys[tty]['base'] != base for tty in native_ttys.keys())]
+        legacy_vuart_base = ""
+        legacy_vuart_id_list = vm_node.xpath("legacy_vuart[base != 'INVALID_COM_BASE']/@id")
+        for legacy_vuart_id in legacy_vuart_id_list:
+            if legacy_vuart_id == '0' and  vm_type == "SOS_VM":
+                if hv_debug_console in native_ttys.keys():
+                    if native_ttys[hv_debug_console]['type'] == "portio":
+                        legacy_vuart_base = native_ttys[hv_debug_console]['base']
+                    else:
+                        legacy_vuart_base = alloc_pio(pio_list)
+                else:
+                    raise lib.error.ResourceError(f"{hv_debug_console} is not in the native environment! The ttyS available are: {native_ttys.keys()}")
             else:
-                vuart0_base = alloc_pio(pio_list)
-                if full:
-                    common.print_yel("All available pio bases are used by native fully. '{}' is taken by sos legacy vuart 0.".format(vuart0_base), warn=True)
+                legacy_vuart_node_base_text = common.get_node(f"./legacy_vuart[@id = '{legacy_vuart_id}']/base/text()", vm_node)
+                if legacy_vuart_node_base_text == 'COM1_BASE' or legacy_vuart_node_base_text == 'SOS_COM1_BASE':
+                    legacy_vuart_base = '0x3F8'
+                elif legacy_vuart_node_base_text == 'COM2_BASE' or legacy_vuart_node_base_text == 'SOS_COM2_BASE':
+                    legacy_vuart_base = '0x2F8'
+                elif legacy_vuart_node_base_text == 'COM3_BASE' or legacy_vuart_node_base_text == 'SOS_COM3_BASE':
+                    legacy_vuart_base = '0x3E8'
+                elif legacy_vuart_node_base_text == 'COM4_BASE' or legacy_vuart_node_base_text == 'SOS_COM4_BASE':
+                    legacy_vuart_base = '0x2E8'
+                else:
+                    legacy_vuart_base = alloc_pio(pio_list)
 
-            create_vuart_base_node(allocation_etree, str(vm_id), "0", vuart0_base)
-
-        if common.get_node("./legacy_vuart[@id = '1']/base/text()", scenario_sos_vm_node) != "INVALID_COM_BASE":
-            vuart1_base = alloc_pio(pio_list)
-            if full:
-                common.print_yel("All available pio bases are used by native fully. '{}' is taken by sos legacy vuart 1.".format(vuart1_base), warn=True)
-
-            create_vuart_base_node(allocation_etree, str(vm_id), "1", vuart1_base)
+            create_vuart_base_node(allocation_etree, common.get_node("./@id", vm_node), vm_type, legacy_vuart_id, legacy_vuart_base)
diff --git a/misc/config_tools/xforms/misc_cfg.h.xsl b/misc/config_tools/xforms/misc_cfg.h.xsl
index 98e373039..35fa10740 100644
--- a/misc/config_tools/xforms/misc_cfg.h.xsl
+++ b/misc/config_tools/xforms/misc_cfg.h.xsl
@@ -37,7 +37,6 @@
     <xsl:if test="count(vm[acrn:is-sos-vm(vm_type)])">
       <xsl:call-template name="sos_rootfs" />
       <xsl:call-template name="sos_serial_console" />
-      <xsl:call-template name="sos_com_vuarts" />
       <xsl:call-template name="sos_bootargs_diff" />
     </xsl:if>
     <xsl:call-template name="cpu_affinity" />
@@ -88,28 +87,6 @@
   <xsl:value-of select="acrn:define('SOS_CONSOLE', $sos_console, '')" />
 </xsl:template>
 
-<xsl:template name="sos_com_vuarts">
-  <xsl:for-each select="vm">
-    <xsl:if test="acrn:is-sos-vm(vm_type)">
-      <xsl:choose>
-        <xsl:when test="legacy_vuart[@id = 0]/base[text() != 'INVALID_COM_BASE']">
-          <xsl:value-of select="acrn:define('SOS_COM1_BASE', //allocation-data/acrn-config/vm[acrn:is-sos-vm(vm_type)]/legacy_vuart[@id = 0]/base, 'U')" />
-          <xsl:value-of select="acrn:define('SOS_COM1_IRQ', //allocation-data/acrn-config/vm[acrn:is-sos-vm(vm_type)]/legacy_vuart[@id = 0]/irq, 'U')" />
-        </xsl:when>
-        <xsl:otherwise>
-          <xsl:value-of select="acrn:define('SOS_COM1_BASE', '0', 'U')" />
-          <xsl:value-of select="acrn:define('SOS_COM1_IRQ', '0', 'U')" />
-        </xsl:otherwise>
-      </xsl:choose>
-      <xsl:if test="legacy_vuart[@id = 1]/base[text() != 'INVALID_COM_BASE']">
-        <xsl:value-of select="acrn:define('SOS_COM2_BASE', //allocation-data/acrn-config/vm[acrn:is-sos-vm(vm_type)]/legacy_vuart[@id = 1]/base, 'U')" />
-        <xsl:value-of select="acrn:define('SOS_COM2_IRQ', //allocation-data/acrn-config/vm[acrn:is-sos-vm(vm_type)]/legacy_vuart[@id = 1]/irq, 'U')" />
-      </xsl:if>
-      <xsl:value-of select="$newline" />
-    </xsl:if>
-  </xsl:for-each>
-</xsl:template>
-
 <xsl:template name="sos_bootargs_diff">
   <xsl:variable name="bootargs" select="normalize-space(vm[acrn:is-sos-vm(vm_type)]/board_private/bootargs[text()])" />
   <xsl:variable name="maxcpunum" select="count(//vm[acrn:is-sos-vm(vm_type)]/cpu_affinity/pcpu_id)" />
diff --git a/misc/config_tools/xforms/vm_configurations.c.xsl b/misc/config_tools/xforms/vm_configurations.c.xsl
index 24119aee7..b23b28a3a 100644
--- a/misc/config_tools/xforms/vm_configurations.c.xsl
+++ b/misc/config_tools/xforms/vm_configurations.c.xsl
@@ -76,7 +76,7 @@
     <xsl:apply-templates select="memory" />
     <xsl:apply-templates select="os_config" />
     <xsl:call-template name="acpi_config" />
-    <xsl:apply-templates select="legacy_vuart" />
+    <xsl:call-template name="legacy_vuart" />
     <xsl:call-template name="pci_dev_num" />
     <xsl:call-template name="pci_devs" />
     <xsl:if test="acrn:is-pre-launched-vm(vm_type)">
@@ -199,19 +199,23 @@
     </xsl:if>
   </xsl:template>
 
-  <xsl:template match="legacy_vuart">
-    <xsl:value-of select="acrn:initializer(concat('vuart[', @id, ']'), '{', true())" />
-    <xsl:value-of select="acrn:initializer('type', type)" />
-    <xsl:value-of select="acrn:initializer('addr.port_base', base)" />
-    <xsl:if test="base != 'INVALID_COM_BASE'">
-      <xsl:value-of select="acrn:initializer('irq', irq)" />
-      <xsl:if test="@id = '1'">
-        <xsl:value-of select="acrn:initializer('t_vuart.vm_id', concat(target_vm_id, 'U'))" />
-        <xsl:value-of select="acrn:initializer('t_vuart.vuart_id', concat(target_uart_id, 'U'))" />
+  <xsl:template name="legacy_vuart">
+    <xsl:variable name="vm_id" select="@id" />
+    <xsl:for-each select="legacy_vuart">
+      <xsl:variable name="vuart_id" select="@id" />
+      <xsl:value-of select="acrn:initializer(concat('vuart[', $vuart_id, ']'), '{', true())" />
+      <xsl:value-of select="acrn:initializer('type', type)" />
+      <xsl:if test="base != 'INVALID_COM_BASE'">
+        <xsl:value-of select="acrn:initializer('addr.port_base', concat(../../../../allocation-data/acrn-config/vm[@id=$vm_id]/legacy_vuart[@id=$vuart_id]/base, 'U'))" />
+        <xsl:value-of select="acrn:initializer('irq', concat(../../../../allocation-data/acrn-config/vm[@id=$vm_id]/legacy_vuart[@id=$vuart_id]/irq, 'U'))" />
+        <xsl:if test="@id != '0'">
+          <xsl:value-of select="acrn:initializer('t_vuart.vm_id', concat(target_vm_id, 'U'))" />
+          <xsl:value-of select="acrn:initializer('t_vuart.vuart_id', concat(target_uart_id, 'U'))" />
+        </xsl:if>
       </xsl:if>
-    </xsl:if>
-    <xsl:text>},</xsl:text>
-    <xsl:value-of select="$newline" />
+      <xsl:text>},</xsl:text>
+      <xsl:value-of select="$newline" />
+    </xsl:for-each>
   </xsl:template>
 
   <xsl:template name="pci_dev_num">