OvmfPkg/Library/XenPlatformLib: New library

The purpose of XenPlatformLib is to regroup the few functions that are
used in several places to detect if Xen is detected, and to get the
XenInfo HOB.

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: <20190813113119.14804-14-anthony.perard@citrix.com>

OvmfPkg/Library/XenPlatformLib/XenPlatformLib.inf

@@ -0,0 +1,33 @@
+## @file
+#  Get information about Xen
+#
+#  This library simply allow to find out if OVMF is running under Xen and
+#  allow to get more information when it is the case.
+#
+#  Copyright (c) 2019, Citrix Systems, Inc.
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = XenPlatformLib
+  FILE_GUID                      = DB54DBB7-8142-4EE5-9364-78C824B582EB
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = XenPlatformLib
+
+[Sources]
+  XenPlatformLib.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  OvmfPkg/OvmfPkg.dec
+
+[LibraryClasses]
+  HobLib
+
+[Guids]
+  gEfiXenInfoGuid