arm64: Force KPTI to be disabled on Cavium ThunderX

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Commit 6dc52b15c4 upstream.

Cavium ThunderX's erratum 27456 results in a corruption of icache
entries that are loaded from memory that is mapped as non-global
(i.e. ASID-tagged).

As KPTI is based on memory being mapped non-global, let's prevent
it from kicking in if this erratum is detected.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
[will: Update comment]
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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Marc Zyngier 2018-01-29 11:59:56 +00:00 • committed by Greg Kroah-Hartman

parent 2feb36ebe4

commit e39247ca17

1 changed files with 14 additions and 3 deletions

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arch/arm64/kernel/cpufeature.c

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