[PATCH v3 2/2] SecurityPkg/Tcg2Config: remove TPM2_ChangEPS if it is not supported.

[Qi Zhang <qi1.zhang@intel.com>]

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>
---
 SecurityPkg/Tcg/Tcg2Config/Tcg2Config.vfr     | 2 ++
 SecurityPkg/Tcg/Tcg2Config/Tcg2ConfigImpl.c   | 7 +++++++
 SecurityPkg/Tcg/Tcg2Config/Tcg2ConfigNvData.h | 1 +
 3 files changed, 10 insertions(+)

diff --git a/SecurityPkg/Tcg/Tcg2Config/Tcg2Config.vfr b/SecurityPkg/Tcg/Tcg2Config/Tcg2Config.vfr
index 91a463997c..47d63b009d 100644
--- a/SecurityPkg/Tcg/Tcg2Config/Tcg2Config.vfr
+++ b/SecurityPkg/Tcg/Tcg2Config/Tcg2Config.vfr
@@ -144,7 +144,9 @@ formset
             option text = STRING_TOKEN(STR_TCG2_DISABLE), value = TCG2_PHYSICAL_PRESENCE_DISABLE, flags = RESET_REQUIRED;
             option text = STRING_TOKEN(STR_TCG2_CLEAR), value = TCG2_PHYSICAL_PRESENCE_CLEAR, flags = RESET_REQUIRED;
             option text = STRING_TOKEN(STR_TCG2_SET_PCD_BANKS), value = TCG2_PHYSICAL_PRESENCE_SET_PCR_BANKS, flags = RESET_REQUIRED;
+            suppressif ideqval TCG2_CONFIGURATION_INFO.ChangeEPSSupported == 0;
             option text = STRING_TOKEN(STR_TCG2_CHANGE_EPS), value = TCG2_PHYSICAL_PRESENCE_CHANGE_EPS, flags = RESET_REQUIRED;
+            endif
             option text = STRING_TOKEN(STR_TCG2_LOG_ALL_DIGESTS), value = TCG2_PHYSICAL_PRESENCE_LOG_ALL_DIGESTS, flags = RESET_REQUIRED;
             option text = STRING_TOKEN(STR_TCG2_DISABLE_ENDORSEMENT_ENABLE_STORAGE_HIERARCHY), value = TCG2_PHYSICAL_PRESENCE_DISABLE_ENDORSEMENT_ENABLE_STORAGE_HIERARCHY, flags = RESET_REQUIRED;
     endoneof;
diff --git a/SecurityPkg/Tcg/Tcg2Config/Tcg2ConfigImpl.c b/SecurityPkg/Tcg/Tcg2Config/Tcg2ConfigImpl.c
index baa8fcd08d..f3731d7990 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 ((EFI_D_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);
 
diff --git a/SecurityPkg/Tcg/Tcg2Config/Tcg2ConfigNvData.h b/SecurityPkg/Tcg/Tcg2Config/Tcg2ConfigNvData.h
index a91c052850..b84af40a04 100644
--- a/SecurityPkg/Tcg/Tcg2Config/Tcg2ConfigNvData.h
+++ b/SecurityPkg/Tcg/Tcg2Config/Tcg2ConfigNvData.h
@@ -70,6 +70,7 @@ typedef struct {
   UINT8    TpmDeviceInterfaceAttempt;
   BOOLEAN  TpmDeviceInterfacePtpFifoSupported;
   BOOLEAN  TpmDeviceInterfacePtpCrbSupported;
+  BOOLEAN  ChangeEPSSupported;
 } TCG2_CONFIGURATION_INFO;
 
 //
-- 
2.26.2.windows.1