arm64: Branch predictor hardening for Cavium ThunderX2

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Commit f3d795d9b3 upstream.

Use PSCI based mitigation for speculative execution attacks targeting
the branch predictor. We use the same mechanism as the one used for
Cortex-A CPUs, we expect the PSCI version call to have a side effect
of clearing the BTBs.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Jayachandran C <jnair@caviumnetworks.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Jayachandran C 2018-01-19 04:22:47 -08:00 • committed by Greg Kroah-Hartman

parent 9b26a45c34

commit 402aeac587

1 changed files with 10 additions and 0 deletions

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arch/arm64/kernel/cpu_errata.c

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