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arm64: cpufeature: Account min_field_value when cheking secondaries for PAuth

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In case, both boot_val and sec_val have value below min_field_value we
would wrongly report that address authentication is supported. It is
not a big issue because we enable address authentication based on boot
cpu (and check there is correct).

Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220224124952.119612-2-vladimir.murzin@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Vladimir Murzin 2022-02-24 12:49:50 +00:00 committed by Will Deacon
parent dfd42facf1
commit da844beb6d
1 changed files with 1 additions and 1 deletions
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arch/arm64/kernel/cpufeature.c
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@ -1829,7 +1829,7 @@ static bool has_address_auth_cpucap(const struct arm64_cpu_capabilities *entry,
/* Now check for the secondary CPUs with SCOPE_LOCAL_CPU scope */
sec_val = cpuid_feature_extract_field(__read_sysreg_by_encoding(entry->sys_reg),
entry->field_pos, entry->sign);
return sec_val == boot_val;
return (sec_val >= entry->min_field_value) && (sec_val == boot_val);
}
static bool has_address_auth_metacap(const struct arm64_cpu_capabilities *entry,