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ArmVirtPkg: Fallback to variable emulation if no CFI is found

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The kvmtool option '--flash <flash filename>' is used to launch
a guests VM with a CFI flash device that maps the flash file
specified at the command line.
However, kvmtool allows guest VMs to be launched without a CFI
flash device. In such scenarios the firmware can utilize the
emulated variable storage for UEFI variables. To support this
the PCD gEfiMdeModulePkgTokenSpaceGuid.PcdEmuVariableNvModeEnable
must be set to TRUE.

Therefore, update the NorFlashKvmtoolLib to fallback to variable
emulation if a CFI device is not detected. Also improve the error
logging.

Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Sami Mujawar
2023-05-11 14:52:17 +01:00
committed by mergify[bot]
parent 0e5aecfed1
commit 84d0b21d18
2 changed files with 36 additions and 5 deletions
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3
ArmVirtPkg/Library/NorFlashKvmtoolLib/NorFlashKvmtoolLib.inf
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@@ -1,7 +1,7 @@
## @file
# Nor Flash library for Kvmtool.
#
# Copyright (c) 2020, ARM Ltd. All rights reserved.<BR>
# Copyright (c) 2020 - 2023, Arm Ltd. All rights reserved.<BR>
# SPDX-License-Identifier: BSD-2-Clause-Patent
#
##
@@ -39,6 +39,7 @@
gArmTokenSpaceGuid.PcdFvBaseAddress
gArmTokenSpaceGuid.PcdFvSize
gEfiMdeModulePkgTokenSpaceGuid.PcdEmuVariableNvModeEnable
gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableBase
gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableSize
gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwWorkingBase