config-tools: allow to use polling mode for legacy vuart

Using polling mode When set a legacy vuart's irq to 0.

Tracked-On: #6652
Signed-off-by: Yang,Yu-chu <yu-chu.yang@intel.com>

misc/config_tools/library/scenario_cfg_lib.py

@@ -28,7 +28,7 @@ AVALIBLE_COM1_BASE = [INVALID_COM_BASE, 'COM1_BASE']
 AVALIBLE_COM2_BASE = [INVALID_COM_BASE, 'COM2_BASE']
 
 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']
+             'COM1_IRQ', 'COM2_IRQ', 'COM3_IRQ', 'COM4_IRQ', 'CONFIG_COM_IRQ', '0']
 
 # Support 512M, 1G, 2G
 # pre launch less then 2G, sos vm less than 24G

misc/config_tools/schema/VMtypes.xsd

@@ -247,8 +247,9 @@ must exactly match the module tag in the GRUB multiboot cmdline.</xs:documentati
   <xs:annotation acrn:configurable="n">
     <xs:documentation>A string with either ``SOS_COM1_IRQ``,
 ``SOS_COM2_IRQ``, ``SOS_COM3_IRQ``, ``SOS_COM4_IRQ``,
-``COM1_IRQ``, ``COM2_IRQ``, ``COM3_IRQ``, ``COM4_IRQ``
-or ``CONFIG_COM_IRQ``.</xs:documentation>
+``COM1_IRQ``, ``COM2_IRQ``, ``COM3_IRQ``, ``COM4_IRQ``,
+``CONFIG_COM_IRQ`` or ``0``. If ``0`` is set, the vuart will
+use polling mode.</xs:documentation>
   </xs:annotation>
   <xs:restriction base="xs:string">
     <xs:enumeration value="SOS_COM1_IRQ" />
@@ -260,6 +261,7 @@ or ``CONFIG_COM_IRQ``.</xs:documentation>
     <xs:enumeration value="COM3_IRQ" />
     <xs:enumeration value="COM4_IRQ" />
     <xs:enumeration value="CONFIG_COM_IRQ" />
+    <xs:enumeration value="0" />
   </xs:restriction>
 </xs:simpleType>
 

misc/config_tools/static_allocators/intx.py

@@ -63,6 +63,8 @@ def assign_legacy_vuart_irqs(vm_node, legacy_vuart_id, irq_list):
         legacy_vuart_irq = '3'
         if legacy_vuart_irq in irq_list:
             remove_irq(irq_list, legacy_vuart_irq)
+    elif legacy_vuart_node_irq_text == '0':
+        legacy_vuart_irq = '0'
     else:
         legacy_vuart_irq = alloc_irq(irq_list)
     return legacy_vuart_irq