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From cbce29f7749477e271f9764fed82de94724af5df Mon Sep 17 00:00:00 2001
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From: Laszlo Ersek <lersek@redhat.com>
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Date: Wed, 24 Jun 2020 11:40:09 +0200
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Subject: [PATCH 3/3] SecurityPkg/Tcg2Dxe: suppress error on no swtpm in silent
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aa64 build (RH)
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Laszlo Ersek <lersek@redhat.com>
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Message-id: <20200615080105.11859-4-lersek@redhat.com>
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Patchwork-id: 97534
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O-Subject: [RHEL-8.3.0 edk2 PATCH 3/3] SecurityPkg/Tcg2Dxe: suppress error on no swtpm in silent aa64 build (RH)
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Bugzilla: 1844682
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RH-Acked-by: Vitaly Kuznetsov <vkuznets@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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If swtpm / vTPM2 is not being used, Tcg2Dxe should return EFI_UNSUPPORTED,
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so that the DXE Core can unload it. However, the associated error message,
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logged by the DXE Core to the serial console, is not desired in the silent
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edk2-aarch64 build, given that the absence of swtpm / vTPM2 is nothing out
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of the ordinary. Therefore, return success and stay resident. The wasted
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guest RAM still gets freed after ExitBootServices().
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(Inspired by RHEL-8.1.0 commit aaaedc1e2cfd.)
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Signed-off-by: Laszlo Ersek <lersek@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c | 17 +++++++++++++++++
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SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.inf | 1 +
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2 files changed, 18 insertions(+)
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diff --git a/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c b/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c
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index 9a5f987e68..da2153cb25 100644
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--- a/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c
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+++ b/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c
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@@ -28,6 +28,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
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#include <Protocol/ResetNotification.h>
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#include <Library/DebugLib.h>
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+#include <Library/DebugPrintErrorLevelLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/UefiRuntimeServicesTableLib.h>
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#include <Library/UefiDriverEntryPoint.h>
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@@ -2642,6 +2643,22 @@ DriverEntry (
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if (CompareGuid (PcdGetPtr(PcdTpmInstanceGuid), &gEfiTpmDeviceInstanceNoneGuid) ||
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CompareGuid (PcdGetPtr(PcdTpmInstanceGuid), &gEfiTpmDeviceInstanceTpm12Guid)){
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DEBUG ((DEBUG_INFO, "No TPM2 instance required!\n"));
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+#if defined (MDE_CPU_AARCH64)
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+ //
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+ // RHBZ#1844682
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+ //
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+ // If swtpm / vTPM2 is not being used, this driver should return
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+ // EFI_UNSUPPORTED, so that the DXE Core can unload it. However, the
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+ // associated error message, logged by the DXE Core to the serial console,
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+ // is not desired in the silent edk2-aarch64 build, given that the absence
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+ // of swtpm / vTPM2 is nothing out of the ordinary. Therefore, return
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+ // success and stay resident. The wasted guest RAM still gets freed after
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+ // ExitBootServices().
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+ //
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+ if (GetDebugPrintErrorLevel () == DEBUG_ERROR) {
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+ return EFI_SUCCESS;
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+ }
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+#endif
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return EFI_UNSUPPORTED;
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}
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diff --git a/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.inf b/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.inf
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index 576cf80d06..851471afb7 100644
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--- a/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.inf
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+++ b/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.inf
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@@ -55,6 +55,7 @@
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UefiRuntimeServicesTableLib
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BaseMemoryLib
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DebugLib
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+ DebugPrintErrorLevelLib
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Tpm2CommandLib
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PrintLib
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UefiLib
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--
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2.27.0
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