arm64: kpti: Whitelist Cortex-A CPUs that don't implement the CSV3 field

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While the CSV3 field of the ID_AA64_PFR0 CPU ID register can be checked
to see if a CPU is susceptible to Meltdown and therefore requires kpti
to be enabled, existing CPUs do not implement this field.

We therefore whitelist all unaffected Cortex-A CPUs that do not implement
the CSV3 field.

Signed-off-by: Will Deacon <will.deacon@arm.com>

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Will Deacon 2018-12-13 13:47:38 +00:00

parent b47f515bdc

commit 2a355ec257

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arch/arm64/kernel/cpufeature.c

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