efi/arm: Defer persistent reservations until after paging_init()
authorArd Biesheuvel <ard.biesheuvel@linaro.org>
Wed, 14 Nov 2018 17:55:43 +0000 (09:55 -0800)
committerIngo Molnar <mingo@kernel.org>
Thu, 15 Nov 2018 09:04:46 +0000 (10:04 +0100)
commiteff896288872d687d9662000ec9ae11b6d61766f
tree87714359c17406ff59e8d30e78c9213cea1bec27
parent72a58a63a164b4e9d2d914e65caeb551846883f1
efi/arm: Defer persistent reservations until after paging_init()

The new memory EFI reservation feature we introduced to allow memory
reservations to persist across kexec may trigger an unbounded number
of calls to memblock_reserve(). The memblock subsystem can deal with
this fine, but not before memblock resizing is enabled, which we can
only do after paging_init(), when the memory we reallocate the array
into is actually mapped.

So break out the memreserve table processing into a separate routine
and call it after paging_init() on arm64. On ARM, because of limited
reviewing bandwidth of the maintainer, we cannot currently fix this,
so instead, disable the EFI persistent memreserve entirely on ARM so
we can fix it later.

Tested-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20181114175544.12860-5-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/arm64/kernel/setup.c
drivers/firmware/efi/efi.c
drivers/firmware/efi/libstub/arm-stub.c
include/linux/efi.h