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arm64: kpti: Whitelist Cortex-A CPUs that don't implement the CSV3 field
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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@ -946,6 +946,12 @@ static bool unmap_kernel_at_el0(const struct arm64_cpu_capabilities *entry,
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static const struct midr_range kpti_safe_list[] = {
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MIDR_ALL_VERSIONS(MIDR_CAVIUM_THUNDERX2),
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MIDR_ALL_VERSIONS(MIDR_BRCM_VULCAN),
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MIDR_ALL_VERSIONS(MIDR_CORTEX_A35),
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MIDR_ALL_VERSIONS(MIDR_CORTEX_A53),
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MIDR_ALL_VERSIONS(MIDR_CORTEX_A55),
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MIDR_ALL_VERSIONS(MIDR_CORTEX_A57),
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MIDR_ALL_VERSIONS(MIDR_CORTEX_A72),
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MIDR_ALL_VERSIONS(MIDR_CORTEX_A73),
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{ /* sentinel */ }
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};
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char const *str = "command line option";
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