diff options
Diffstat (limited to 'arch/arm64/kernel/cpufeature.c')
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index e5281e1c8f1d..76c60b3cda53 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -808,6 +808,12 @@ static void __init init_cpu_ftr_reg(u32 sys_reg, u64 new) reg->name, ftrp->shift + ftrp->width - 1, ftrp->shift, str, tmp); + } else if ((ftr_mask & reg->override->val) == ftr_mask) { + reg->override->val &= ~ftr_mask; + pr_warn("%s[%d:%d]: impossible override, ignored\n", + reg->name, + ftrp->shift + ftrp->width - 1, + ftrp->shift); } val = arm64_ftr_set_value(ftrp, val, ftr_new); @@ -1619,7 +1625,6 @@ int get_cpu_with_amu_feat(void) } #endif -#ifdef CONFIG_ARM64_VHE static bool runs_at_el2(const struct arm64_cpu_capabilities *entry, int __unused) { return is_kernel_in_hyp_mode(); @@ -1638,7 +1643,6 @@ static void cpu_copy_el2regs(const struct arm64_cpu_capabilities *__unused) if (!alternative_is_applied(ARM64_HAS_VIRT_HOST_EXTN)) write_sysreg(read_sysreg(tpidr_el1), tpidr_el2); } -#endif static void cpu_has_fwb(const struct arm64_cpu_capabilities *__unused) { @@ -1823,6 +1827,18 @@ static const struct arm64_cpu_capabilities arm64_features[] = { .cpu_enable = cpu_enable_pan, }, #endif /* CONFIG_ARM64_PAN */ +#ifdef CONFIG_ARM64_EPAN + { + .desc = "Enhanced Privileged Access Never", + .capability = ARM64_HAS_EPAN, + .type = ARM64_CPUCAP_SYSTEM_FEATURE, + .matches = has_cpuid_feature, + .sys_reg = SYS_ID_AA64MMFR1_EL1, + .field_pos = ID_AA64MMFR1_PAN_SHIFT, + .sign = FTR_UNSIGNED, + .min_field_value = 3, + }, +#endif /* CONFIG_ARM64_EPAN */ #ifdef CONFIG_ARM64_LSE_ATOMICS { .desc = "LSE atomic instructions", @@ -1841,7 +1857,6 @@ static const struct arm64_cpu_capabilities arm64_features[] = { .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE, .matches = has_no_hw_prefetch, }, -#ifdef CONFIG_ARM64_VHE { .desc = "Virtualization Host Extensions", .capability = ARM64_HAS_VIRT_HOST_EXTN, @@ -1849,7 +1864,6 @@ static const struct arm64_cpu_capabilities arm64_features[] = { .matches = runs_at_el2, .cpu_enable = cpu_copy_el2regs, }, -#endif /* CONFIG_ARM64_VHE */ { .desc = "32-bit EL0 Support", .capability = ARM64_HAS_32BIT_EL0, |