ArmVirtPkg: Kvmtool: Only install IORT if ITS is present

When the Kvmtool guest is launched without ITS support
i.e. when --irq-chip=gicv3-its option is not specified
or if --irq-chip=gicv3 is specified, the guest VM does
not have an ITS.

In such scenarios the guest firmware must not install
the IORT table. Therefore, add checks to see if ITS is
present before installing the IORT ACPI table.

Cc: Ard Biesheuvel <[email protected]>
Cc: Leif Lindholm <[email protected]>
Cc: Gerd Hoffmann <[email protected]>
Signed-off-by: Sami Mujawar <[email protected]>

Author: samimujawar

ArmVirtPkg/KvmtoolCfgMgrDxe/ConfigurationManager.c

@@ -1,7 +1,7 @@
 /** @file
   Configuration Manager Dxe
 
-  Copyright (c) 2021 - 2022, Arm Limited. All rights reserved.<BR>
+  Copyright (c) 2021 - 2024, Arm Limited. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
@@ -712,6 +712,22 @@ GetStandardNameSpaceObject (
           // IORT is only required for GicV3/4
           //
           AcpiTableCount -= 1;
+        } else {
+          //
+          // Check if we have support for ITS.
+          //
+          Status = DynamicPlatRepoGetObject (
+                     PlatformRepo->DynamicPlatformRepo,
+                     CREATE_CM_ARM_OBJECT_ID (EArmObjGicItsInfo),
+                     CM_NULL_TOKEN,
+                     &CmObjDesc
+                     );
+          if (EFI_ERROR (Status)) {
+            //
+            // IORT is only required for GicV3/4 if ITS is present.
+            //
+            AcpiTableCount -= 1;
+          }
         }
       }