arm64: Use firmware to detect CPUs that are not affected by Spectre-v2

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The SMCCC ARCH_WORKAROUND_1 service can indicate that although the
firmware knows about the Spectre-v2 mitigation, this particular
CPU is not vulnerable, and it is thus not necessary to call
the firmware on this CPU.

Let's use this information to our benefit.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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Marc Zyngier 2019-04-15 16:21:24 -05:00 • committed by Will Deacon

parent 73f3816609

commit 517953c2c4

1 changed files with 23 additions and 9 deletions

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arch/arm64/kernel/cpu_errata.c

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