[edk2-devel] [PATCH V3 4/7] OvmfPkg: Add CcProbeLib
Min Xu
min.m.xu at intel.com
Sun Apr 17 03:01:10 UTC 2022
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 at intel.com>
Cc: Liming Gao <gaoliming at byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu at intel.com>
Cc: James Bottomley <jejb at linux.ibm.com>
Cc: James Bottomley <James.Bottomley at HansenPartnership.com>
Cc: Jiewen Yao <jiewen.yao at intel.com>
Cc: Gerd Hoffmann <kraxel at redhat.com>
Cc: Brijesh Singh <brijesh.singh at amd.com>
Cc: Erdem Aktas <erdemaktas at google.com>
Cc: Tom Lendacky <thomas.lendacky at amd.com>
Signed-off-by: Min Xu <min.m.xu at intel.com>
---
OvmfPkg/Library/CcProbeLib/CcProbeLib.c | 31 +++++++++++++++++++++++
OvmfPkg/Library/CcProbeLib/CcProbeLib.inf | 25 ++++++++++++++++++
2 files changed, 56 insertions(+)
create mode 100644 OvmfPkg/Library/CcProbeLib/CcProbeLib.c
create mode 100644 OvmfPkg/Library/CcProbeLib/CcProbeLib.inf
diff --git a/OvmfPkg/Library/CcProbeLib/CcProbeLib.c b/OvmfPkg/Library/CcProbeLib/CcProbeLib.c
new file mode 100644
index 000000000000..b4babcb423f7
--- /dev/null
+++ b/OvmfPkg/Library/CcProbeLib/CcProbeLib.c
@@ -0,0 +1,31 @@
+/** @file
+
+ CcProbeLib is used to probe the Confidential computing guest type.
+
+ Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/CcProbeLib.h>
+#include <WorkArea.h>
+
+/**
+ Probe the ConfidentialComputing Guest type. See defition of
+ CC_GUEST_TYPE in <ConfidentialComputingGuestAttr.h>.
+
+ @return The guest type
+
+**/
+UINT8
+EFIAPI
+CcProbe (
+ VOID
+ )
+{
+ OVMF_WORK_AREA *WorkArea;
+
+ WorkArea = (OVMF_WORK_AREA *)FixedPcdGet32 (PcdOvmfWorkAreaBase);
+
+ return WorkArea != NULL ? WorkArea->Header.GuestType : CCGuestTypeNonEncrypted;
+}
diff --git a/OvmfPkg/Library/CcProbeLib/CcProbeLib.inf b/OvmfPkg/Library/CcProbeLib/CcProbeLib.inf
new file mode 100644
index 000000000000..5300c9ba2644
--- /dev/null
+++ b/OvmfPkg/Library/CcProbeLib/CcProbeLib.inf
@@ -0,0 +1,25 @@
+## @file
+# CcProbeLib is used to probe Confidential Computing guest type.
+#
+# Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = CcProbeLib
+ FILE_GUID = 05184ec9-abb0-4491-8584-e388639a7c48
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = CcProbeLib
+
+[Sources]
+ CcProbeLib.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ OvmfPkg/OvmfPkg.dec
+
+[Pcd]
+ gUefiOvmfPkgTokenSpaceGuid.PcdOvmfWorkAreaBase
--
2.29.2.windows.2
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