From deb3451034326b75fd760aba47a5171493ff055e Mon Sep 17 00:00:00 2001
From: Philippe Mathieu-Daude <philmd@redhat.com>
Date: Thu, 1 Aug 2019 20:43:48 +0200
Subject: OvmfPkg: QemuRamfbDxe: Do not report DXE failure on Aarch64 silent
 builds (RH only)

Notes about the RHEL-8.2/20190904-37eef91017ad [edk2-stable201908] ->
RHEL-8.3/20200603-ca407c7246bf [edk2-stable202005] rebase:

- no change

Notes about the RHEL-8.1/20190308-89910a39dcfd [edk2-stable201903] ->
RHEL-8.2/20190904-37eef91017ad [edk2-stable201908] rebase:

- We have to carry this downstream-only patch -- committed originally as
  aaaedc1e2cfd -- indefinitely.

- To avoid confusion, remove the tags from the commit message that had
  been added by the downstream maintainer scripts, such as: Message-id,
  Patchwork-id, O-Subject, Acked-by. These remain available on the
  original downstream commit. The Bugzilla line is preserved, as it
  doesn't relate to a specific posting, but to the problem.

Bugzilla: 1714446

To suppress an error message on the silent build when ramfb is
not configured, change QemuRamfbDxe to return EFI_SUCCESS even
when it fails.
Some memory is wasted (driver stays resident without
any good use), but it is mostly harmless, as the memory
is released by the OS after ExitBootServices().

Suggested-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Philippe Mathieu-Daude <philmd@redhat.com>
(cherry picked from commit aaaedc1e2cfd55ef003fb1b5a37c73a196b26dc7)
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
(cherry picked from commit aa2b66b18a62d652bdbefae7b5732297294306ca)
---
 OvmfPkg/QemuRamfbDxe/QemuRamfb.c      | 14 ++++++++++++++
 OvmfPkg/QemuRamfbDxe/QemuRamfbDxe.inf |  1 +
 2 files changed, 15 insertions(+)

diff --git a/OvmfPkg/QemuRamfbDxe/QemuRamfb.c b/OvmfPkg/QemuRamfbDxe/QemuRamfb.c
index 0d49d8bbab..dbf9bcbe16 100644
--- a/OvmfPkg/QemuRamfbDxe/QemuRamfb.c
+++ b/OvmfPkg/QemuRamfbDxe/QemuRamfb.c
@@ -13,6 +13,7 @@
 #include <Library/BaseLib.h>
 #include <Library/BaseMemoryLib.h>
 #include <Library/DebugLib.h>
+#include <Library/DebugPrintErrorLevelLib.h>
 #include <Library/DevicePathLib.h>
 #include <Library/FrameBufferBltLib.h>
 #include <Library/MemoryAllocationLib.h>
@@ -242,6 +243,19 @@ InitializeQemuRamfb (
 
   Status = QemuFwCfgFindFile ("etc/ramfb", &mRamfbFwCfgItem, &FwCfgSize);
   if (EFI_ERROR (Status)) {
+#if defined (MDE_CPU_AARCH64)
+    //
+    // RHBZ#1714446
+    // If no ramfb device was configured, this platform DXE driver should
+    // returns EFI_NOT_FOUND, so the DXE Core can unload it. However, even
+    // using a silent build, an error message is issued to the guest console.
+    // Since this confuse users, return success and stay resident. The wasted
+    // guest RAM still gets freed later after ExitBootServices().
+    //
+    if (GetDebugPrintErrorLevel () == DEBUG_ERROR) {
+      return EFI_SUCCESS;
+    }
+#endif
     return EFI_NOT_FOUND;
   }
   if (FwCfgSize != sizeof (RAMFB_CONFIG)) {
diff --git a/OvmfPkg/QemuRamfbDxe/QemuRamfbDxe.inf b/OvmfPkg/QemuRamfbDxe/QemuRamfbDxe.inf
index e3890b8c20..6ffee5acb2 100644
--- a/OvmfPkg/QemuRamfbDxe/QemuRamfbDxe.inf
+++ b/OvmfPkg/QemuRamfbDxe/QemuRamfbDxe.inf
@@ -29,6 +29,7 @@
   BaseLib
   BaseMemoryLib
   DebugLib
+  DebugPrintErrorLevelLib
   DevicePathLib
   FrameBufferBltLib
   MemoryAllocationLib
-- 
2.18.1