arm64: Take into account ID_AA64PFR0_EL1.CSV3

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Commit 179a56f6f9 upstream.

For non-KASLR kernels where the KPTI behaviour has not been overridden
on the command line we can use ID_AA64PFR0_EL1.CSV3 to determine whether
or not we should unmap the kernel whilst running at EL0.

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Will Deacon 2017-11-27 18:29:30 +00:00 • committed by Greg Kroah-Hartman

parent 5e319f4533

commit 83ae3355bd

2 changed files with 8 additions and 1 deletions

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1

arch/arm64/include/asm/sysreg.h

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8

arch/arm64/kernel/cpufeature.c

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