edk2/0027-SecurityPkg-Tcg2Dxe-suppress-error-on-no-swtpm-in-si.patch

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From dc27035d2a8ca09dc5b0113c97a643341f286c08 Mon Sep 17 00:00:00 2001
From: Laszlo Ersek <lersek@redhat.com>
Date: Wed, 24 Jun 2020 11:40:09 +0200
Subject: SecurityPkg/Tcg2Dxe: suppress error on no swtpm in silent aa64 build
(RH)
Notes about the RHEL-8.3/20200603-ca407c7246bf [edk2-stable202005] ->
RHEL-8.5/20210520-e1999b264f1f [edk2-stable202105] rebase:
- Remove obsolete commit message tags related to downstream patch
management: Message-id, Patchwork-id, O-Subject, Acked-by, From,
RH-Acked-by, RH-Author (RHBZ#1846481).
Bugzilla: 1844682
If swtpm / vTPM2 is not being used, Tcg2Dxe should return EFI_UNSUPPORTED,
so that the DXE Core can unload it. However, the associated error message,
logged by the DXE Core to the serial console, is not desired in the silent
edk2-aarch64 build, given that the absence of swtpm / vTPM2 is nothing out
of the ordinary. Therefore, return success and stay resident. The wasted
guest RAM still gets freed after ExitBootServices().
(Inspired by RHEL-8.1.0 commit aaaedc1e2cfd.)
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
(cherry picked from commit cbce29f7749477e271f9764fed82de94724af5df)
---
SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c | 17 +++++++++++++++++
SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.inf | 1 +
2 files changed, 18 insertions(+)
diff --git a/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c b/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c
index 6d17616c1c..f1a97d4b2d 100644
--- a/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c
+++ b/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c
@@ -28,6 +28,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
#include <Protocol/ResetNotification.h>
#include <Library/DebugLib.h>
+#include <Library/DebugPrintErrorLevelLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Library/UefiDriverEntryPoint.h>
@@ -2642,6 +2643,22 @@ DriverEntry (
if (CompareGuid (PcdGetPtr(PcdTpmInstanceGuid), &gEfiTpmDeviceInstanceNoneGuid) ||
CompareGuid (PcdGetPtr(PcdTpmInstanceGuid), &gEfiTpmDeviceInstanceTpm12Guid)){
DEBUG ((DEBUG_INFO, "No TPM2 instance required!\n"));
+#if defined (MDE_CPU_AARCH64)
+ //
+ // RHBZ#1844682
+ //
+ // If swtpm / vTPM2 is not being used, this driver should return
+ // EFI_UNSUPPORTED, so that the DXE Core can unload it. However, the
+ // associated error message, logged by the DXE Core to the serial console,
+ // is not desired in the silent edk2-aarch64 build, given that the absence
+ // of swtpm / vTPM2 is nothing out of the ordinary. Therefore, return
+ // success and stay resident. The wasted guest RAM still gets freed after
+ // ExitBootServices().
+ //
+ if (GetDebugPrintErrorLevel () == DEBUG_ERROR) {
+ return EFI_SUCCESS;
+ }
+#endif
return EFI_UNSUPPORTED;
}
diff --git a/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.inf b/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.inf
index 7dc7a2683d..3bc8833931 100644
--- a/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.inf
+++ b/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.inf
@@ -55,6 +55,7 @@
UefiRuntimeServicesTableLib
BaseMemoryLib
DebugLib
+ DebugPrintErrorLevelLib
Tpm2CommandLib
PrintLib
UefiLib
--
2.27.0