ArmVirtualizationPkg: VirtFdtDxe: use dedicated VIRTIO_MMIO_TRANSPORT_GUID

Installing VenHw() device paths with this GUID, for the virtio-mmio
transports that we detect, enables other modules to recognize those
VenHw() nodes. (Note that the actual value doesn't change.)

In addition, to avoid reusing GUIDs in unrelated contexts, detach the
driver's FILE_GUID from its previous value.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16573 6f19259b-4bc3-4df7-8a09-765794883524

ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c

@@ -27,6 +27,7 @@
 #include <libfdt.h>
 
 #include <Guid/Fdt.h>
+#include <Guid/VirtioMmioTransport.h>
 
 #pragma pack (1)
 typedef struct {
@@ -209,7 +210,8 @@ InitializeVirtFdtDxe (
         break;
       }
 
-      CopyMem (&DevicePath->Vendor.Guid, &gEfiCallerIdGuid, sizeof (EFI_GUID));
+      CopyMem (&DevicePath->Vendor.Guid, &gVirtioMmioTransportGuid,
+        sizeof (EFI_GUID));
       DevicePath->PhysBase = RegBase;
       SetDevicePathNodeLength (&DevicePath->Vendor,
                                sizeof (*DevicePath) - sizeof (DevicePath->End));

ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.inf

@@ -16,7 +16,7 @@
 [Defines]
   INF_VERSION                    = 0x00010005
   BASE_NAME                      = VirtFdtDxe
-  FILE_GUID                      = 837DCA9E-E874-4D82-B29A-23FE0E23D1E2
+  FILE_GUID                      = 9AD7DCB4-E6EC-472E-96BF-81C219A3F77E
   MODULE_TYPE                    = DXE_DRIVER
   VERSION_STRING                 = 1.0
 
@@ -43,6 +43,7 @@
 
 [Guids]
   gFdtTableGuid
+  gVirtioMmioTransportGuid
 
 [Pcd]
   gArmVirtualizationTokenSpaceGuid.PcdDeviceTreeBaseAddress