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arm64: kpti: Whitelist Cortex-A CPUs that don't implement the CSV3 field
commit 2a355ec257
upstream.
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>
Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -838,6 +838,11 @@ static bool unmap_kernel_at_el0(const struct arm64_cpu_capabilities *entry,
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switch (read_cpuid_id() & MIDR_CPU_MODEL_MASK) {
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case MIDR_CAVIUM_THUNDERX2:
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case MIDR_BRCM_VULCAN:
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case MIDR_CORTEX_A53:
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case MIDR_CORTEX_A55:
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case MIDR_CORTEX_A57:
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case MIDR_CORTEX_A72:
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case MIDR_CORTEX_A73:
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return false;
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}
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