OvmfPkg: Add CcProbeLib

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3902

This is the OvmfPkg specific CcProbeLib. It checks the Ovmf WorkArea
(PcdOvmfWorkAreaBase) to return the guest type.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>

diff --git a/OvmfPkg/Library/CcProbeLib/CcProbeLib.c b/OvmfPkg/Library/CcProbeLib/CcProbeLib.c
new file mode 100644 (file)
index 0000000..d698e5c
--- /dev/null
+++ b/OvmfPkg/Library/CcProbeLib/CcProbeLib.c
@@ -0,0 +1,31 @@
+/** @file\r
+\r
+  CcProbeLib is used to probe the Confidential computing guest type.\r
+\r
+  Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>\r
+  SPDX-License-Identifier: BSD-2-Clause-Patent\r
+\r
+**/\r
+\r
+#include <Library/CcProbeLib.h>\r
+#include <WorkArea.h>\r
+\r
+/**\r
+  Probe the ConfidentialComputing Guest type. See defition of\r
+  CC_GUEST_TYPE in <ConfidentialComputingGuestAttr.h>.\r
+\r
+  @return The guest type\r
+\r
+**/\r
+UINT8\r
+EFIAPI\r
+CcProbe (\r
+  VOID\r
+  )\r
+{\r
+  OVMF_WORK_AREA  *WorkArea;\r
+\r
+  WorkArea = (OVMF_WORK_AREA *)FixedPcdGet32 (PcdOvmfWorkAreaBase);\r
+\r
+  return WorkArea != NULL ? WorkArea->Header.GuestType : CcGuestTypeNonEncrypted;\r
+}\r

diff --git a/OvmfPkg/Library/CcProbeLib/CcProbeLib.inf b/OvmfPkg/Library/CcProbeLib/CcProbeLib.inf
new file mode 100644 (file)
index 0000000..5300c9b
--- /dev/null
+++ b/OvmfPkg/Library/CcProbeLib/CcProbeLib.inf
@@ -0,0 +1,25 @@
+## @file\r
+# CcProbeLib is used to probe Confidential Computing guest type.\r
+#\r
+#  Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>\r
+#  SPDX-License-Identifier: BSD-2-Clause-Patent\r
+#\r
+##\r
+\r
+[Defines]\r
+  INF_VERSION                    = 0x00010005\r
+  BASE_NAME                      = CcProbeLib\r
+  FILE_GUID                      = 05184ec9-abb0-4491-8584-e388639a7c48\r
+  MODULE_TYPE                    = BASE\r
+  VERSION_STRING                 = 1.0\r
+  LIBRARY_CLASS                  = CcProbeLib\r
+\r
+[Sources]\r
+  CcProbeLib.c\r
+\r
+[Packages]\r
+  MdePkg/MdePkg.dec\r
+  OvmfPkg/OvmfPkg.dec\r
+\r
+[Pcd]\r
+  gUefiOvmfPkgTokenSpaceGuid.PcdOvmfWorkAreaBase\r