[Xen-devel] [PATCH v4 28/29] ArmVirtualizationPkg/VirtFdtDxe: wire up XenBusDxe to "xen, xen" DT node

[Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>]

This patchs adds support to VirtFdtDxe for the Xen DT node which
contains the base address of the Grant Table. This data is communicated
to XenBusDxe using a XENIO_PROTOCOL instance.

Contributed-under: TianoCore Contribution Agreement 1.0
Reviewed-by: Laszlo Ersek <lersek@xxxxxxxxxx>
Reviewed-by: Olivier Martin <olivier.martin@xxxxxxx>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
---
 ArmPlatformPkg/ArmVirtualizationPkg/ArmVirtualization.dsc.inc |  2 ++
 ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c   | 23 
+++++++++++++++++++++++
 ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.inf |  1 +
 3 files changed, 26 insertions(+)

diff --git a/ArmPlatformPkg/ArmVirtualizationPkg/ArmVirtualization.dsc.inc 
b/ArmPlatformPkg/ArmVirtualizationPkg/ArmVirtualization.dsc.inc
index f17cd2f5d876..e7a03cd13d3a 100644
--- a/ArmPlatformPkg/ArmVirtualizationPkg/ArmVirtualization.dsc.inc
+++ b/ArmPlatformPkg/ArmVirtualizationPkg/ArmVirtualization.dsc.inc
@@ -100,6 +100,8 @@
   BdsLib|ArmPkg/Library/BdsLib/BdsLib.inf
   FdtLib|EmbeddedPkg/Library/FdtLib/FdtLib.inf
 
+  XenIoMmioLib|OvmfPkg/Library/XenIoMmioLib/XenIoMmioLib.inf
+
 [LibraryClasses.common.SEC]
   PcdLib|MdePkg/Library/BasePcdLibNull/BasePcdLibNull.inf
   
ArmPlatformSecExtraActionLib|ArmPlatformPkg/Library/DebugSecExtraActionLib/DebugSecExtraActionLib.inf
diff --git a/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c 
b/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c
index 0b6414d59d46..2cc4610376b9 100644
--- a/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c
+++ b/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c
@@ -26,6 +26,7 @@
 #include <Library/DxeServicesLib.h>
 #include <Library/HobLib.h>
 #include <libfdt.h>
+#include <Library/XenIoMmioLib.h>
 
 #include <Guid/Fdt.h>
 #include <Guid/VirtioMmioTransport.h>
@@ -49,6 +50,7 @@ typedef enum {
   PropertyTypePsci,
   PropertyTypeFwCfg,
   PropertyTypeGicV3,
+  PropertyTypeXen,
 } PROPERTY_TYPE;
 
 typedef struct {
@@ -66,6 +68,7 @@ STATIC CONST PROPERTY CompatibleProperties[] = {
   { PropertyTypePsci,    "arm,psci-0.2"        },
   { PropertyTypeFwCfg,   "qemu,fw-cfg-mmio"    },
   { PropertyTypeGicV3,   "arm,gic-v3"          },
+  { PropertyTypeXen,     "xen,xen"             },
   { PropertyTypeUnknown, ""                    }
 };
 
@@ -345,6 +348,26 @@ InitializeVirtFdtDxe (
       }
       break;
 
+    case PropertyTypeXen:
+      ASSERT (Len == 16);
+
+      //
+      // Retrieve the reg base from this node and wire it up to the
+      // MMIO flavor of the XenBus root device I/O protocol
+      //
+      RegBase = fdt64_to_cpu (((UINT64 *)RegProp)[0]);
+      Handle = NULL;
+      Status = XenIoMmioInstall (&Handle, RegBase);
+      if (EFI_ERROR (Status)) {
+        DEBUG ((EFI_D_ERROR, "%a: XenIoMmioInstall () failed on a new handle "
+          "(Status == %r)\n", __FUNCTION__, Status));
+        break;
+      }
+
+      DEBUG ((EFI_D_INFO, "Found Xen node with Grant table @ 0x%Lx\n", 
RegBase));
+
+      break;
+
     default:
       break;
     }
diff --git a/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.inf 
b/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.inf
index 0774fadda21c..a7eef1b979cb 100644
--- a/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.inf
+++ b/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.inf
@@ -41,6 +41,7 @@
   FdtLib
   VirtioMmioDeviceLib
   HobLib
+  XenIoMmioLib
 
 [Guids]
   gFdtTableGuid
-- 
1.8.3.2


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