arm64: cpufeature: Add global feature override facility

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Add a facility to globally override a feature, no matter what
the HW says. Yes, this sounds dangerous, but we do respect the
"safe" value for a given feature. This doesn't mean the user
doesn't need to know what they are doing.

Nothing uses this yet, so we are pretty safe. For now.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: David Brazdil <dbrazdil@google.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20210208095732.3267263-11-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>

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Marc Zyngier 2021-02-08 09:57:19 +00:00 • committed by Will Deacon

parent d077cb3cb9

commit 8f266a5d87

2 changed files with 45 additions and 6 deletions

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6

arch/arm64/include/asm/cpufeature.h

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45

arch/arm64/kernel/cpufeature.c

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