SecurityPkg/Tcg2Config: remove TPM2_ChangEPS if it is not supported.

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2793

In current implementation TPM2_ChangeEPS command is always available
in the TPM2 operation pull down list in TCG2 Configuration, which
is confusing when the command is not supported by specific TPM chip.
As a user experience improvement, TPM2_ChangeEPS command should be
removed from the list when it is not supported.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Chao Zhang <chao.b.zhang@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Signed-off-by: Qi Zhang <qi1.zhang@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/SecurityPkg/Tcg/Tcg2Config/Tcg2ConfigImpl.c b/SecurityPkg/Tcg/Tcg2Config/Tcg2ConfigImpl.c
index baa8fcd08d..2946f95db0 100644
--- a/SecurityPkg/Tcg/Tcg2Config/Tcg2ConfigImpl.c
+++ b/SecurityPkg/Tcg/Tcg2Config/Tcg2ConfigImpl.c
@@ -788,6 +788,7 @@ InstallTcg2ConfigForm (
   CHAR16                          TempBuffer[1024];

   TCG2_CONFIGURATION_INFO         Tcg2ConfigInfo;

   TPM2_PTP_INTERFACE_TYPE         TpmDeviceInterfaceDetected;

+  BOOLEAN                         IsCmdImp = FALSE;

 

   DriverHandle = NULL;

   ConfigAccess = &PrivateData->ConfigAccess;

@@ -870,6 +871,12 @@ InstallTcg2ConfigForm (
     HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_TPM2_SUPPORTED_HASH_ALGO_CONTENT), TempBuffer, NULL);

   }

 

+  Status = Tpm2GetCapabilityIsCommandImplemented (TPM_CC_ChangeEPS, &IsCmdImp);

+  if (EFI_ERROR (Status)) {

+    DEBUG ((DEBUG_ERROR, "Tpm2GetCapabilityIsCmdImpl fails %r\n", Status));

+  }

+  Tcg2ConfigInfo.ChangeEPSSupported = IsCmdImp;

+

   FillBufferWithBootHashAlg (TempBuffer, sizeof(TempBuffer), PcdGet32 (PcdTcg2HashAlgorithmBitmap));

   HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_BIOS_HASH_ALGO_CONTENT), TempBuffer, NULL);