On Thu, 20 Feb 2020 at 04:43, Jing Xiangfeng <jingxiangfeng@xxxxxxxxxx> wrote: > > This series enable finding mirrored memory ranges > functionality on arm64 platform. This feature has been > implemented on the x86 platform, so we move some > functions from x86. > Hello Jing Xiangfeng, Could you explain your use case a bit better? Usually, the firmware is a better place to make modifications to the EFI memory map. The reason I am asking is that currently, on ARM and arm64, we never make *any* changes to the firmware provided tables (EFI system table, EFI memory map, DT/ACPI/SMBIOS tables etc), in order to ensure that kexec is idempotent, i.e., it will always see the exact same state as far as the firmware is concerned. This is a bit different from x86, where the memory map is already modified for various other reasons, so using it for fake memory regions is not such a big deal. Do you see a use case for this in production? > Jing Xiangfeng (2): > efi: allow EFI_FAKE_MEMMAP on arm64 platform > arm64/efi: support to find mirrored memory ranges > > arch/x86/include/asm/efi.h | 5 ----- > arch/x86/platform/efi/efi.c | 39 --------------------------------------- > drivers/firmware/efi/Kconfig | 2 +- > drivers/firmware/efi/arm-init.c | 2 ++ > drivers/firmware/efi/efi.c | 23 +++++++++++++++++++++++ > drivers/firmware/efi/memmap.c | 16 ++++++++++++++++ > include/linux/efi.h | 5 +++++ > 7 files changed, 47 insertions(+), 45 deletions(-) > > -- > 1.8.3.1 >
