From 833cd3e0c0f948670fc639721b2767f31c36e359 Mon Sep 17 00:00:00 2001
From: Anthony PERARD <anthony.perard@citrix.com>
Date: Tue, 13 Aug 2019 12:31:17 +0100
Subject: OvmfPkg: Introduce XenIoPvhDxe to initialize Grant Tables

XenIoPvhDxe use XenIoMmioLib to reserve some space to be use by the
Grant Tables.

The call is only done if it is necessary, we simply detect if the
guest is PVH, as in this case there is currently no PCI bus, and no
PCI Xen platform device which would start the XenIoPciDxe and allocate
the space for the Grant Tables.

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1689
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20190813113119.14804-34-anthony.perard@citrix.com>
---
 OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.c   | 54 +++++++++++++++++++++++++++++++++++++
 OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.inf | 36 +++++++++++++++++++++++++
 2 files changed, 90 insertions(+)
 create mode 100644 OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.c
 create mode 100644 OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.inf

(limited to 'OvmfPkg/XenIoPvhDxe')

diff --git a/OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.c b/OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.c
new file mode 100644
index 0000000000..9264a85df1
--- /dev/null
+++ b/OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.c
@@ -0,0 +1,54 @@
+/** @file
+
+  Driver for the XenIo protocol
+
+  This driver simply allocate space for the grant tables.
+
+  Copyright (c) 2019, Citrix Systems, Inc.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/MemoryAllocationLib.h>
+#include <Library/PcdLib.h>
+#include <Library/XenIoMmioLib.h>
+#include <Library/XenPlatformLib.h>
+
+EFI_STATUS
+EFIAPI
+InitializeXenIoPvhDxe (
+  IN EFI_HANDLE       ImageHandle,
+  IN EFI_SYSTEM_TABLE *SystemTable
+  )
+{
+  VOID          *Allocation;
+  EFI_STATUS    Status;
+  EFI_HANDLE    XenIoHandle;
+
+  Allocation = NULL;
+  XenIoHandle = NULL;
+
+  if (!XenPvhDetected ()) {
+    return EFI_UNSUPPORTED;
+  }
+
+  Allocation = AllocateReservedPages (FixedPcdGet32 (PcdXenGrantFrames));
+  if (Allocation == NULL) {
+    Status = EFI_OUT_OF_RESOURCES;
+    goto Error;
+  }
+
+  Status = XenIoMmioInstall (&XenIoHandle, (UINTN) Allocation);
+  if (EFI_ERROR (Status)) {
+    goto Error;
+  }
+
+  return EFI_SUCCESS;
+
+Error:
+  if (Allocation != NULL) {
+    FreePages (Allocation, FixedPcdGet32 (PcdXenGrantFrames));
+  }
+  return Status;
+}
diff --git a/OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.inf b/OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.inf
new file mode 100644
index 0000000000..1c27f8aae0
--- /dev/null
+++ b/OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.inf
@@ -0,0 +1,36 @@
+## @file
+#  Driver for the XenIo protocol
+#
+#  Copyright (c) 2019, Citrix Systems, Inc.
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION               = 0x00010005
+  BASE_NAME                 = XenIoPvhDxe
+  FILE_GUID                 = 7a567cc4-0e75-4d7a-a305-c3db109b53ad
+  MODULE_TYPE               = DXE_DRIVER
+  VERSION_STRING            = 1.0
+  ENTRY_POINT               = InitializeXenIoPvhDxe
+
+[Packages]
+  MdePkg/MdePkg.dec
+  OvmfPkg/OvmfPkg.dec
+
+[Sources]
+  XenIoPvhDxe.c
+
+[LibraryClasses]
+  MemoryAllocationLib
+  PcdLib
+  UefiDriverEntryPoint
+  XenIoMmioLib
+  XenPlatformLib
+
+[FixedPcd]
+  gUefiOvmfPkgTokenSpaceGuid.PcdXenGrantFrames
+
+[Depex]
+  TRUE
-- 
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