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



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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