diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index d39db638774673a2b2efe1bff2365118f0594ea5..224efe730e4614b4ffd6ab105bacf3de6d6890db 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -193,6 +193,7 @@ void update_cpu_capabilities(const struct arm64_cpu_capabilities *caps, const char *info); void check_local_cpu_errata(void); +void verify_local_cpu_errata(void); void verify_local_cpu_capabilities(void); u64 read_system_reg(u32 id); diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index 2fdecd72ce583ff1efd0b47db13d6ac834649547..d42789499f17eb322a47da83046ca0119e643c75 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -103,6 +103,26 @@ const struct arm64_cpu_capabilities arm64_errata[] = { } }; +/* + * The CPU Errata work arounds are detected and applied at boot time + * and the related information is freed soon after. If the new CPU requires + * an errata not detected at boot, fail this CPU. + */ +void verify_local_cpu_errata(void) +{ + const struct arm64_cpu_capabilities *caps = arm64_errata; + + for (; caps->matches; caps++) + if (!cpus_have_cap(caps->capability) && + caps->matches(caps, SCOPE_LOCAL_CPU)) { + pr_crit("CPU%d: Requires work around for %s, not detected" + " at boot time\n", + smp_processor_id(), + caps->desc ? : "an erratum"); + cpu_die_early(); + } +} + void check_local_cpu_errata(void) { update_cpu_capabilities(arm64_errata, "enabling workaround for"); diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 2b09dc47717895c255d4a6e541254d57cd39f232..811773d1c1d015ca8e47239f5375d3ced3c04b48 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -998,6 +998,7 @@ void verify_local_cpu_capabilities(void) if (!sys_caps_initialised) return; + verify_local_cpu_errata(); verify_local_cpu_features(arm64_features); verify_local_elf_hwcaps(arm64_elf_hwcaps); if (system_supports_32bit_el0())