arm64: cpufeatures: Allow disabling of BTI from the command-line

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In order to be able to disable BTI at runtime, whether it is
for testing purposes, or to work around HW issues, let's add
support for overriding the ID_AA64PFR1_EL1.BTI field.

This is further mapped on the arm64.nobti command-line alias.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: David Brazdil <dbrazdil@google.com>
Tested-by: Srinivas Ramana <sramana@codeaurora.org>
Link: https://lore.kernel.org/r/20210208095732.3267263-21-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>

...

This commit is contained in:

Marc Zyngier 2021-02-08 09:57:29 +00:00 • committed by Will Deacon

parent a762f4ffc3

commit 93ad55b785

5 changed files with 19 additions and 2 deletions

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3

Documentation/admin-guide/kernel-parameters.txt

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1

arch/arm64/include/asm/cpufeature.h

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4

arch/arm64/kernel/cpufeature.c

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11

arch/arm64/kernel/idreg-override.c

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arch/arm64/mm/mmu.c

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