efi/arm: preserve early mapping of UEFI memory map longer for BGRT
authorArd Biesheuvel <ard.biesheuvel@linaro.org>
Mon, 23 Jul 2018 01:57:30 +0000 (10:57 +0900)
committerWill Deacon <will.deacon@arm.com>
Mon, 23 Jul 2018 14:33:18 +0000 (15:33 +0100)
commit3ea86495aef2f6de26b7cb1599ba350dd6a0c521
tree9b74cb231baf0358ab06ce4afc7e40e24043bbb4
parent5bcd44083a082f314032969cd6db1eb8275ac77a
efi/arm: preserve early mapping of UEFI memory map longer for BGRT

The BGRT code validates the contents of the table against the UEFI
memory map, and so it expects it to be mapped when the code runs.

On ARM, this is currently not the case, since we tear down the early
mapping after efi_init() completes, and only create the permanent
mapping in arm_enable_runtime_services(), which executes as an early
initcall, but still leaves a window where the UEFI memory map is not
mapped.

So move the call to efi_memmap_unmap() from efi_init() to
arm_enable_runtime_services().

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
[will: fold in EFI_MEMMAP attribute check from Ard]
Signed-off-by: Will Deacon <will.deacon@arm.com>
drivers/firmware/efi/arm-init.c
drivers/firmware/efi/arm-runtime.c