Make it clear that X86QemuLoadImageLib relies on fw_cfg; prepare the
ground to add a warning about the incompatibility with boot verification
process.

Cc: Laszlo Ersek <lersek@...>
Cc: Ard Biesheuvel <ardb+tianocore@...>
Cc: Jordan Justen <jordan.l.justen@...>
Cc: James Bottomley <jejb@...>
Cc: Tobin Feldman-Fitzthum <tobin@...>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3457
Signed-off-by: Dov Murik <dovmurik@...>
Reviewed-by: Laszlo Ersek <lersek@...>
---
OvmfPkg/Library/X86QemuLoadImageLib/X86QemuLoadImageLib.inf | 3 +++
OvmfPkg/Library/X86QemuLoadImageLib/X86QemuLoadImageLib.c | 3 +++
2 files changed, 6 insertions(+)

diff --git a/OvmfPkg/Library/X86QemuLoadImageLib/X86QemuLoadImageLib.inf b/OvmfPkg/Library/X86QemuLoadImageLib/X86QemuLoadImageLib.inf
index e1615badd2ba..c7ec041cb706 100644
--- a/OvmfPkg/Library/X86QemuLoadImageLib/X86QemuLoadImageLib.inf
+++ b/OvmfPkg/Library/X86QemuLoadImageLib/X86QemuLoadImageLib.inf
@@ -2,6 +2,9 @@
# X86 specific implementation of QemuLoadImageLib library class interface
# with support for loading mixed mode images and non-EFI stub images
#
+# Note that this implementation reads the cmdline (and possibly kernel, setup
+# data, and initrd in the legacy boot mode) from fw_cfg directly.
+#
# Copyright (c) 2020, ARM Ltd. All rights reserved.<BR>
#
# SPDX-License-Identifier: BSD-2-Clause-Patent
diff --git a/OvmfPkg/Library/X86QemuLoadImageLib/X86QemuLoadImageLib.c b/OvmfPkg/Library/X86QemuLoadImageLib/X86QemuLoadImageLib.c
index 6b1e7e649014..9f30df29736d 100644
--- a/OvmfPkg/Library/X86QemuLoadImageLib/X86QemuLoadImageLib.c
+++ b/OvmfPkg/Library/X86QemuLoadImageLib/X86QemuLoadImageLib.c
@@ -2,6 +2,9 @@
X86 specific implementation of QemuLoadImageLib library class interface
with support for loading mixed mode images and non-EFI stub images

+ Note that this implementation reads the cmdline (and possibly kernel, setup
+ data, and initrd in the legacy boot mode) from fw_cfg directly.
+
Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2020, ARM Ltd. All rights reserved.<BR>