1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Contains CPU feature definitions 4 * 5 * Copyright (C) 2015 ARM Ltd. 6 * 7 * A note for the weary kernel hacker: the code here is confusing and hard to 8 * follow! That's partly because it's solving a nasty problem, but also because 9 * there's a little bit of over-abstraction that tends to obscure what's going 10 * on behind a maze of helper functions and macros. 11 * 12 * The basic problem is that hardware folks have started gluing together CPUs 13 * with distinct architectural features; in some cases even creating SoCs where 14 * user-visible instructions are available only on a subset of the available 15 * cores. We try to address this by snapshotting the feature registers of the 16 * boot CPU and comparing these with the feature registers of each secondary 17 * CPU when bringing them up. If there is a mismatch, then we update the 18 * snapshot state to indicate the lowest-common denominator of the feature, 19 * known as the "safe" value. This snapshot state can be queried to view the 20 * "sanitised" value of a feature register. 21 * 22 * The sanitised register values are used to decide which capabilities we 23 * have in the system. These may be in the form of traditional "hwcaps" 24 * advertised to userspace or internal "cpucaps" which are used to configure 25 * things like alternative patching and static keys. While a feature mismatch 26 * may result in a TAINT_CPU_OUT_OF_SPEC kernel taint, a capability mismatch 27 * may prevent a CPU from being onlined at all. 28 * 29 * Some implementation details worth remembering: 30 * 31 * - Mismatched features are *always* sanitised to a "safe" value, which 32 * usually indicates that the feature is not supported. 33 * 34 * - A mismatched feature marked with FTR_STRICT will cause a "SANITY CHECK" 35 * warning when onlining an offending CPU and the kernel will be tainted 36 * with TAINT_CPU_OUT_OF_SPEC. 37 * 38 * - Features marked as FTR_VISIBLE have their sanitised value visible to 39 * userspace. FTR_VISIBLE features in registers that are only visible 40 * to EL0 by trapping *must* have a corresponding HWCAP so that late 41 * onlining of CPUs cannot lead to features disappearing at runtime. 42 * 43 * - A "feature" is typically a 4-bit register field. A "capability" is the 44 * high-level description derived from the sanitised field value. 45 * 46 * - Read the Arm ARM (DDI 0487F.a) section D13.1.3 ("Principles of the ID 47 * scheme for fields in ID registers") to understand when feature fields 48 * may be signed or unsigned (FTR_SIGNED and FTR_UNSIGNED accordingly). 49 * 50 * - KVM exposes its own view of the feature registers to guest operating 51 * systems regardless of FTR_VISIBLE. This is typically driven from the 52 * sanitised register values to allow virtual CPUs to be migrated between 53 * arbitrary physical CPUs, but some features not present on the host are 54 * also advertised and emulated. Look at sys_reg_descs[] for the gory 55 * details. 56 * 57 * - If the arm64_ftr_bits[] for a register has a missing field, then this 58 * field is treated as STRICT RES0, including for read_sanitised_ftr_reg(). 59 * This is stronger than FTR_HIDDEN and can be used to hide features from 60 * KVM guests. 61 */ 62 63 #define pr_fmt(fmt) "CPU features: " fmt 64 65 #include <linux/bsearch.h> 66 #include <linux/cpumask.h> 67 #include <linux/crash_dump.h> 68 #include <linux/kstrtox.h> 69 #include <linux/sort.h> 70 #include <linux/stop_machine.h> 71 #include <linux/sysfs.h> 72 #include <linux/types.h> 73 #include <linux/minmax.h> 74 #include <linux/mm.h> 75 #include <linux/cpu.h> 76 #include <linux/kasan.h> 77 #include <linux/percpu.h> 78 #include <linux/sched/isolation.h> 79 80 #include <asm/cpu.h> 81 #include <asm/cpufeature.h> 82 #include <asm/cpu_ops.h> 83 #include <asm/fpsimd.h> 84 #include <asm/hwcap.h> 85 #include <asm/insn.h> 86 #include <asm/kvm_host.h> 87 #include <asm/mmu.h> 88 #include <asm/mmu_context.h> 89 #include <asm/mte.h> 90 #include <asm/hypervisor.h> 91 #include <asm/processor.h> 92 #include <asm/smp.h> 93 #include <asm/sysreg.h> 94 #include <asm/traps.h> 95 #include <asm/vectors.h> 96 #include <asm/virt.h> 97 98 /* Kernel representation of AT_HWCAP and AT_HWCAP2 */ 99 static DECLARE_BITMAP(elf_hwcap, MAX_CPU_FEATURES) __read_mostly; 100 101 #ifdef CONFIG_COMPAT 102 #define COMPAT_ELF_HWCAP_DEFAULT \ 103 (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\ 104 COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\ 105 COMPAT_HWCAP_TLS|COMPAT_HWCAP_IDIV|\ 106 COMPAT_HWCAP_LPAE) 107 unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT; 108 unsigned int compat_elf_hwcap2 __read_mostly; 109 unsigned int compat_elf_hwcap3 __read_mostly; 110 #endif 111 112 DECLARE_BITMAP(system_cpucaps, ARM64_NCAPS); 113 EXPORT_SYMBOL(system_cpucaps); 114 static struct arm64_cpu_capabilities const __ro_after_init *cpucap_ptrs[ARM64_NCAPS]; 115 116 DECLARE_BITMAP(boot_cpucaps, ARM64_NCAPS); 117 118 /* 119 * arm64_use_ng_mappings must be placed in the .data section, otherwise it 120 * ends up in the .bss section where it is initialized in early_map_kernel() 121 * after the MMU (with the idmap) was enabled. create_init_idmap() - which 122 * runs before early_map_kernel() and reads the variable via PTE_MAYBE_NG - 123 * may end up generating an incorrect idmap page table attributes. 124 */ 125 bool arm64_use_ng_mappings __read_mostly = false; 126 EXPORT_SYMBOL(arm64_use_ng_mappings); 127 128 DEFINE_PER_CPU_READ_MOSTLY(const char *, this_cpu_vector) = vectors; 129 130 /* 131 * Permit PER_LINUX32 and execve() of 32-bit binaries even if not all CPUs 132 * support it? 133 */ 134 static bool __read_mostly allow_mismatched_32bit_el0; 135 136 /* 137 * Static branch enabled only if allow_mismatched_32bit_el0 is set and we have 138 * seen at least one CPU capable of 32-bit EL0. 139 */ 140 DEFINE_STATIC_KEY_FALSE(arm64_mismatched_32bit_el0); 141 142 /* 143 * Mask of CPUs supporting 32-bit EL0. 144 * Only valid if arm64_mismatched_32bit_el0 is enabled. 145 */ 146 static cpumask_var_t cpu_32bit_el0_mask __cpumask_var_read_mostly; 147 148 void dump_cpu_features(void) 149 { 150 /* file-wide pr_fmt adds "CPU features: " prefix */ 151 pr_emerg("0x%*pb\n", ARM64_NCAPS, &system_cpucaps); 152 } 153 154 #define __ARM64_MAX_POSITIVE(reg, field) \ 155 ((reg##_##field##_SIGNED ? \ 156 BIT(reg##_##field##_WIDTH - 1) : \ 157 BIT(reg##_##field##_WIDTH)) - 1) 158 159 #define __ARM64_MIN_NEGATIVE(reg, field) BIT(reg##_##field##_WIDTH - 1) 160 161 #define __ARM64_CPUID_FIELDS(reg, field, min_value, max_value) \ 162 .sys_reg = SYS_##reg, \ 163 .field_pos = reg##_##field##_SHIFT, \ 164 .field_width = reg##_##field##_WIDTH, \ 165 .sign = reg##_##field##_SIGNED, \ 166 .min_field_value = min_value, \ 167 .max_field_value = max_value, 168 169 /* 170 * ARM64_CPUID_FIELDS() encodes a field with a range from min_value to 171 * an implicit maximum that depends on the sign-ess of the field. 172 * 173 * An unsigned field will be capped at all ones, while a signed field 174 * will be limited to the positive half only. 175 */ 176 #define ARM64_CPUID_FIELDS(reg, field, min_value) \ 177 __ARM64_CPUID_FIELDS(reg, field, \ 178 SYS_FIELD_VALUE(reg, field, min_value), \ 179 __ARM64_MAX_POSITIVE(reg, field)) 180 181 /* 182 * ARM64_CPUID_FIELDS_NEG() encodes a field with a range from an 183 * implicit minimal value to max_value. This should be used when 184 * matching a non-implemented property. 185 */ 186 #define ARM64_CPUID_FIELDS_NEG(reg, field, max_value) \ 187 __ARM64_CPUID_FIELDS(reg, field, \ 188 __ARM64_MIN_NEGATIVE(reg, field), \ 189 SYS_FIELD_VALUE(reg, field, max_value)) 190 191 #define __ARM64_FTR_BITS(SIGNED, VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ 192 { \ 193 .sign = SIGNED, \ 194 .visible = VISIBLE, \ 195 .strict = STRICT, \ 196 .type = TYPE, \ 197 .shift = SHIFT, \ 198 .width = WIDTH, \ 199 .safe_val = SAFE_VAL, \ 200 } 201 202 /* Define a feature with unsigned values */ 203 #define ARM64_FTR_BITS(VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ 204 __ARM64_FTR_BITS(FTR_UNSIGNED, VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) 205 206 /* Define a feature with a signed value */ 207 #define S_ARM64_FTR_BITS(VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ 208 __ARM64_FTR_BITS(FTR_SIGNED, VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) 209 210 #define ARM64_FTR_END \ 211 { \ 212 .width = 0, \ 213 } 214 215 static void cpu_enable_cnp(struct arm64_cpu_capabilities const *cap); 216 217 static bool __system_matches_cap(unsigned int n); 218 219 /* 220 * NOTE: Any changes to the visibility of features should be kept in 221 * sync with the documentation of the CPU feature register ABI. 222 */ 223 static const struct arm64_ftr_bits ftr_id_aa64isar0[] = { 224 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_RNDR_SHIFT, 4, 0), 225 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_TLB_SHIFT, 4, 0), 226 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_TS_SHIFT, 4, 0), 227 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_FHM_SHIFT, 4, 0), 228 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_DP_SHIFT, 4, 0), 229 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_SM4_SHIFT, 4, 0), 230 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_SM3_SHIFT, 4, 0), 231 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_SHA3_SHIFT, 4, 0), 232 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_RDM_SHIFT, 4, 0), 233 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_ATOMIC_SHIFT, 4, 0), 234 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_CRC32_SHIFT, 4, 0), 235 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_SHA2_SHIFT, 4, 0), 236 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_SHA1_SHIFT, 4, 0), 237 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_AES_SHIFT, 4, 0), 238 ARM64_FTR_END, 239 }; 240 241 static const struct arm64_ftr_bits ftr_id_aa64isar1[] = { 242 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_XS_SHIFT, 4, 0), 243 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_I8MM_SHIFT, 4, 0), 244 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_DGH_SHIFT, 4, 0), 245 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_BF16_SHIFT, 4, 0), 246 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_SPECRES_SHIFT, 4, 0), 247 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_SB_SHIFT, 4, 0), 248 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_FRINTTS_SHIFT, 4, 0), 249 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), 250 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_GPI_SHIFT, 4, 0), 251 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), 252 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_GPA_SHIFT, 4, 0), 253 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_LRCPC_SHIFT, 4, 0), 254 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_FCMA_SHIFT, 4, 0), 255 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_JSCVT_SHIFT, 4, 0), 256 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), 257 FTR_STRICT, FTR_EXACT, ID_AA64ISAR1_EL1_API_SHIFT, 4, 0), 258 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), 259 FTR_STRICT, FTR_EXACT, ID_AA64ISAR1_EL1_APA_SHIFT, 4, 0), 260 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_DPB_SHIFT, 4, 0), 261 ARM64_FTR_END, 262 }; 263 264 static const struct arm64_ftr_bits ftr_id_aa64isar2[] = { 265 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_LUT_SHIFT, 4, 0), 266 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_CSSC_SHIFT, 4, 0), 267 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_RPRFM_SHIFT, 4, 0), 268 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_CLRBHB_SHIFT, 4, 0), 269 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_BC_SHIFT, 4, 0), 270 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_MOPS_SHIFT, 4, 0), 271 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), 272 FTR_STRICT, FTR_EXACT, ID_AA64ISAR2_EL1_APA3_SHIFT, 4, 0), 273 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), 274 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_GPA3_SHIFT, 4, 0), 275 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_RPRES_SHIFT, 4, 0), 276 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_WFxT_SHIFT, 4, 0), 277 ARM64_FTR_END, 278 }; 279 280 static const struct arm64_ftr_bits ftr_id_aa64isar3[] = { 281 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR3_EL1_FPRCVT_SHIFT, 4, 0), 282 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR3_EL1_LSFE_SHIFT, 4, 0), 283 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR3_EL1_FAMINMAX_SHIFT, 4, 0), 284 ARM64_FTR_END, 285 }; 286 287 static const struct arm64_ftr_bits ftr_id_aa64pfr0[] = { 288 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_CSV3_SHIFT, 4, 0), 289 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_CSV2_SHIFT, 4, 0), 290 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_DIT_SHIFT, 4, 0), 291 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_AMU_SHIFT, 4, 0), 292 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_MPAM_SHIFT, 4, 0), 293 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_SEL2_SHIFT, 4, 0), 294 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 295 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_SVE_SHIFT, 4, 0), 296 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_RAS_SHIFT, 4, 0), 297 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_GIC_SHIFT, 4, 0), 298 S_ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_AdvSIMD_SHIFT, 4, ID_AA64PFR0_EL1_AdvSIMD_NI), 299 S_ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_FP_SHIFT, 4, ID_AA64PFR0_EL1_FP_NI), 300 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_EL3_SHIFT, 4, 0), 301 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_EL2_SHIFT, 4, 0), 302 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_EL1_SHIFT, 4, ID_AA64PFR0_EL1_EL1_IMP), 303 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_EL0_SHIFT, 4, ID_AA64PFR0_EL1_EL0_IMP), 304 ARM64_FTR_END, 305 }; 306 307 static const struct arm64_ftr_bits ftr_id_aa64pfr1[] = { 308 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_EL1_DF2_SHIFT, 4, 0), 309 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_GCS), 310 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_EL1_GCS_SHIFT, 4, 0), 311 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_EL1_MTE_frac_SHIFT, 4, 0), 312 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 313 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_EL1_SME_SHIFT, 4, 0), 314 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_EL1_MPAM_frac_SHIFT, 4, 0), 315 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_EL1_RAS_frac_SHIFT, 4, 0), 316 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_MTE), 317 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_EL1_MTE_SHIFT, 4, ID_AA64PFR1_EL1_MTE_NI), 318 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR1_EL1_SSBS_SHIFT, 4, ID_AA64PFR1_EL1_SSBS_NI), 319 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_BTI), 320 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_EL1_BT_SHIFT, 4, 0), 321 ARM64_FTR_END, 322 }; 323 324 static const struct arm64_ftr_bits ftr_id_aa64pfr2[] = { 325 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR2_EL1_FPMR_SHIFT, 4, 0), 326 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR2_EL1_MTEFAR_SHIFT, 4, ID_AA64PFR2_EL1_MTEFAR_NI), 327 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR2_EL1_MTESTOREONLY_SHIFT, 4, ID_AA64PFR2_EL1_MTESTOREONLY_NI), 328 ARM64_FTR_END, 329 }; 330 331 static const struct arm64_ftr_bits ftr_id_aa64zfr0[] = { 332 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 333 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_F64MM_SHIFT, 4, 0), 334 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 335 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_F32MM_SHIFT, 4, 0), 336 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 337 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_F16MM_SHIFT, 4, 0), 338 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 339 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_I8MM_SHIFT, 4, 0), 340 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 341 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_SM4_SHIFT, 4, 0), 342 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 343 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_SHA3_SHIFT, 4, 0), 344 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 345 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_B16B16_SHIFT, 4, 0), 346 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 347 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_BF16_SHIFT, 4, 0), 348 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 349 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_BitPerm_SHIFT, 4, 0), 350 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 351 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_EltPerm_SHIFT, 4, 0), 352 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 353 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_AES_SHIFT, 4, 0), 354 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 355 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_SVEver_SHIFT, 4, 0), 356 ARM64_FTR_END, 357 }; 358 359 static const struct arm64_ftr_bits ftr_id_aa64smfr0[] = { 360 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 361 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_FA64_SHIFT, 1, 0), 362 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 363 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_LUTv2_SHIFT, 1, 0), 364 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 365 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_SMEver_SHIFT, 4, 0), 366 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 367 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_I16I64_SHIFT, 4, 0), 368 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 369 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_F64F64_SHIFT, 1, 0), 370 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 371 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_I16I32_SHIFT, 4, 0), 372 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 373 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_B16B16_SHIFT, 1, 0), 374 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 375 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_F16F16_SHIFT, 1, 0), 376 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 377 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_F8F16_SHIFT, 1, 0), 378 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 379 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_F8F32_SHIFT, 1, 0), 380 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 381 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_I8I32_SHIFT, 4, 0), 382 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 383 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_F16F32_SHIFT, 1, 0), 384 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 385 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_B16F32_SHIFT, 1, 0), 386 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 387 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_BI32I32_SHIFT, 1, 0), 388 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 389 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_F32F32_SHIFT, 1, 0), 390 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 391 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_SF8FMA_SHIFT, 1, 0), 392 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 393 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_SF8DP4_SHIFT, 1, 0), 394 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 395 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_SF8DP2_SHIFT, 1, 0), 396 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 397 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_SBitPerm_SHIFT, 1, 0), 398 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 399 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_AES_SHIFT, 1, 0), 400 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 401 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_SFEXPA_SHIFT, 1, 0), 402 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 403 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_STMOP_SHIFT, 1, 0), 404 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 405 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_SMOP4_SHIFT, 1, 0), 406 ARM64_FTR_END, 407 }; 408 409 static const struct arm64_ftr_bits ftr_id_aa64fpfr0[] = { 410 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8CVT_SHIFT, 1, 0), 411 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8FMA_SHIFT, 1, 0), 412 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8DP4_SHIFT, 1, 0), 413 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8DP2_SHIFT, 1, 0), 414 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8MM8_SHIFT, 1, 0), 415 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8MM4_SHIFT, 1, 0), 416 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8E4M3_SHIFT, 1, 0), 417 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8E5M2_SHIFT, 1, 0), 418 ARM64_FTR_END, 419 }; 420 421 static const struct arm64_ftr_bits ftr_id_aa64mmfr0[] = { 422 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_ECV_SHIFT, 4, 0), 423 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_FGT_SHIFT, 4, 0), 424 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_EXS_SHIFT, 4, 0), 425 /* 426 * Page size not being supported at Stage-2 is not fatal. You 427 * just give up KVM if PAGE_SIZE isn't supported there. Go fix 428 * your favourite nesting hypervisor. 429 * 430 * There is a small corner case where the hypervisor explicitly 431 * advertises a given granule size at Stage-2 (value 2) on some 432 * vCPUs, and uses the fallback to Stage-1 (value 0) for other 433 * vCPUs. Although this is not forbidden by the architecture, it 434 * indicates that the hypervisor is being silly (or buggy). 435 * 436 * We make no effort to cope with this and pretend that if these 437 * fields are inconsistent across vCPUs, then it isn't worth 438 * trying to bring KVM up. 439 */ 440 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64MMFR0_EL1_TGRAN4_2_SHIFT, 4, 1), 441 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64MMFR0_EL1_TGRAN64_2_SHIFT, 4, 1), 442 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64MMFR0_EL1_TGRAN16_2_SHIFT, 4, 1), 443 /* 444 * We already refuse to boot CPUs that don't support our configured 445 * page size, so we can only detect mismatches for a page size other 446 * than the one we're currently using. Unfortunately, SoCs like this 447 * exist in the wild so, even though we don't like it, we'll have to go 448 * along with it and treat them as non-strict. 449 */ 450 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_TGRAN4_SHIFT, 4, ID_AA64MMFR0_EL1_TGRAN4_NI), 451 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_TGRAN64_SHIFT, 4, ID_AA64MMFR0_EL1_TGRAN64_NI), 452 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_TGRAN16_SHIFT, 4, ID_AA64MMFR0_EL1_TGRAN16_NI), 453 454 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_BIGENDEL0_SHIFT, 4, 0), 455 /* Linux shouldn't care about secure memory */ 456 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_SNSMEM_SHIFT, 4, 0), 457 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_BIGEND_SHIFT, 4, 0), 458 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_ASIDBITS_SHIFT, 4, 0), 459 /* 460 * Differing PARange is fine as long as all peripherals and memory are mapped 461 * within the minimum PARange of all CPUs 462 */ 463 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_PARANGE_SHIFT, 4, 0), 464 ARM64_FTR_END, 465 }; 466 467 static const struct arm64_ftr_bits ftr_id_aa64mmfr1[] = { 468 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_ECBHB_SHIFT, 4, 0), 469 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_TIDCP1_SHIFT, 4, 0), 470 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_AFP_SHIFT, 4, 0), 471 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_HCX_SHIFT, 4, 0), 472 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_ETS_SHIFT, 4, 0), 473 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_TWED_SHIFT, 4, 0), 474 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_XNX_SHIFT, 4, 0), 475 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_HIGHER_SAFE, ID_AA64MMFR1_EL1_SpecSEI_SHIFT, 4, 0), 476 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_PAN_SHIFT, 4, 0), 477 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_LO_SHIFT, 4, 0), 478 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_HPDS_SHIFT, 4, 0), 479 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_VH_SHIFT, 4, 0), 480 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_VMIDBits_SHIFT, 4, 0), 481 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_HAFDBS_SHIFT, 4, 0), 482 ARM64_FTR_END, 483 }; 484 485 static const struct arm64_ftr_bits ftr_id_aa64mmfr2[] = { 486 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_E0PD_SHIFT, 4, 0), 487 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_EVT_SHIFT, 4, 0), 488 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_BBM_SHIFT, 4, 0), 489 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_TTL_SHIFT, 4, 0), 490 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_FWB_SHIFT, 4, 0), 491 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_IDS_SHIFT, 4, 0), 492 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_AT_SHIFT, 4, 0), 493 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_ST_SHIFT, 4, 0), 494 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_NV_SHIFT, 4, 0), 495 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_CCIDX_SHIFT, 4, 0), 496 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_VARange_SHIFT, 4, 0), 497 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_IESB_SHIFT, 4, 0), 498 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_LSM_SHIFT, 4, 0), 499 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_UAO_SHIFT, 4, 0), 500 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_CnP_SHIFT, 4, 0), 501 ARM64_FTR_END, 502 }; 503 504 static const struct arm64_ftr_bits ftr_id_aa64mmfr3[] = { 505 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_POE), 506 FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR3_EL1_S1POE_SHIFT, 4, 0), 507 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR3_EL1_S1PIE_SHIFT, 4, 0), 508 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR3_EL1_SCTLRX_SHIFT, 4, 0), 509 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR3_EL1_TCRX_SHIFT, 4, 0), 510 ARM64_FTR_END, 511 }; 512 513 static const struct arm64_ftr_bits ftr_id_aa64mmfr4[] = { 514 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR4_EL1_E2H0_SHIFT, 4, 0), 515 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR4_EL1_NV_frac_SHIFT, 4, 0), 516 ARM64_FTR_END, 517 }; 518 519 static const struct arm64_ftr_bits ftr_ctr[] = { 520 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, 31, 1, 1), /* RES1 */ 521 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_EL0_DIC_SHIFT, 1, 1), 522 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_EL0_IDC_SHIFT, 1, 1), 523 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_HIGHER_OR_ZERO_SAFE, CTR_EL0_CWG_SHIFT, 4, 0), 524 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_HIGHER_OR_ZERO_SAFE, CTR_EL0_ERG_SHIFT, 4, 0), 525 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_EL0_DminLine_SHIFT, 4, 1), 526 /* 527 * Linux can handle differing I-cache policies. Userspace JITs will 528 * make use of *minLine. 529 * If we have differing I-cache policies, report it as the weakest - VIPT. 530 */ 531 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_EXACT, CTR_EL0_L1Ip_SHIFT, 2, CTR_EL0_L1Ip_VIPT), /* L1Ip */ 532 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_EL0_IminLine_SHIFT, 4, 0), 533 ARM64_FTR_END, 534 }; 535 536 static struct arm64_ftr_override __ro_after_init no_override = { }; 537 538 struct arm64_ftr_reg arm64_ftr_reg_ctrel0 = { 539 .name = "SYS_CTR_EL0", 540 .ftr_bits = ftr_ctr, 541 .override = &no_override, 542 }; 543 544 static const struct arm64_ftr_bits ftr_id_mmfr0[] = { 545 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_EL1_InnerShr_SHIFT, 4, 0xf), 546 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_EL1_FCSE_SHIFT, 4, 0), 547 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_MMFR0_EL1_AuxReg_SHIFT, 4, 0), 548 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_EL1_TCM_SHIFT, 4, 0), 549 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_EL1_ShareLvl_SHIFT, 4, 0), 550 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_EL1_OuterShr_SHIFT, 4, 0xf), 551 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_EL1_PMSA_SHIFT, 4, 0), 552 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_EL1_VMSA_SHIFT, 4, 0), 553 ARM64_FTR_END, 554 }; 555 556 static const struct arm64_ftr_bits ftr_id_aa64dfr0[] = { 557 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_EL1_DoubleLock_SHIFT, 4, 0), 558 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64DFR0_EL1_PMSVer_SHIFT, 4, 0), 559 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_EL1_CTX_CMPs_SHIFT, 4, 0), 560 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_EL1_WRPs_SHIFT, 4, 0), 561 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_EL1_BRPs_SHIFT, 4, 0), 562 /* 563 * We can instantiate multiple PMU instances with different levels 564 * of support. 565 */ 566 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64DFR0_EL1_PMUVer_SHIFT, 4, 0), 567 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, ID_AA64DFR0_EL1_DebugVer_SHIFT, 4, 0x6), 568 ARM64_FTR_END, 569 }; 570 571 static const struct arm64_ftr_bits ftr_mvfr0[] = { 572 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR0_EL1_FPRound_SHIFT, 4, 0), 573 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR0_EL1_FPShVec_SHIFT, 4, 0), 574 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR0_EL1_FPSqrt_SHIFT, 4, 0), 575 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR0_EL1_FPDivide_SHIFT, 4, 0), 576 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR0_EL1_FPTrap_SHIFT, 4, 0), 577 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, MVFR0_EL1_FPDP_SHIFT, 4, 0), 578 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR0_EL1_FPSP_SHIFT, 4, 0), 579 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR0_EL1_SIMDReg_SHIFT, 4, 0), 580 ARM64_FTR_END, 581 }; 582 583 static const struct arm64_ftr_bits ftr_mvfr1[] = { 584 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, MVFR1_EL1_SIMDFMAC_SHIFT, 4, 0), 585 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, MVFR1_EL1_FPHP_SHIFT, 4, 0), 586 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, MVFR1_EL1_SIMDHP_SHIFT, 4, 0), 587 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, MVFR1_EL1_SIMDSP_SHIFT, 4, 0), 588 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, MVFR1_EL1_SIMDInt_SHIFT, 4, 0), 589 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, MVFR1_EL1_SIMDLS_SHIFT, 4, 0), 590 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR1_EL1_FPDNaN_SHIFT, 4, 0), 591 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR1_EL1_FPFtZ_SHIFT, 4, 0), 592 ARM64_FTR_END, 593 }; 594 595 static const struct arm64_ftr_bits ftr_mvfr2[] = { 596 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR2_EL1_FPMisc_SHIFT, 4, 0), 597 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR2_EL1_SIMDMisc_SHIFT, 4, 0), 598 ARM64_FTR_END, 599 }; 600 601 static const struct arm64_ftr_bits ftr_dczid[] = { 602 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, DCZID_EL0_DZP_SHIFT, 1, 1), 603 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, DCZID_EL0_BS_SHIFT, 4, 0), 604 ARM64_FTR_END, 605 }; 606 607 static const struct arm64_ftr_bits ftr_gmid[] = { 608 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, GMID_EL1_BS_SHIFT, 4, 0), 609 ARM64_FTR_END, 610 }; 611 612 static const struct arm64_ftr_bits ftr_id_isar0[] = { 613 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_EL1_Divide_SHIFT, 4, 0), 614 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_EL1_Debug_SHIFT, 4, 0), 615 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_EL1_Coproc_SHIFT, 4, 0), 616 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_EL1_CmpBranch_SHIFT, 4, 0), 617 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_EL1_BitField_SHIFT, 4, 0), 618 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_EL1_BitCount_SHIFT, 4, 0), 619 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_EL1_Swap_SHIFT, 4, 0), 620 ARM64_FTR_END, 621 }; 622 623 static const struct arm64_ftr_bits ftr_id_isar5[] = { 624 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_EL1_RDM_SHIFT, 4, 0), 625 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_EL1_CRC32_SHIFT, 4, 0), 626 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_EL1_SHA2_SHIFT, 4, 0), 627 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_EL1_SHA1_SHIFT, 4, 0), 628 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_EL1_AES_SHIFT, 4, 0), 629 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_EL1_SEVL_SHIFT, 4, 0), 630 ARM64_FTR_END, 631 }; 632 633 static const struct arm64_ftr_bits ftr_id_mmfr4[] = { 634 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_EL1_EVT_SHIFT, 4, 0), 635 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_EL1_CCIDX_SHIFT, 4, 0), 636 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_EL1_LSM_SHIFT, 4, 0), 637 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_EL1_HPDS_SHIFT, 4, 0), 638 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_EL1_CnP_SHIFT, 4, 0), 639 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_EL1_XNX_SHIFT, 4, 0), 640 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_EL1_AC2_SHIFT, 4, 0), 641 642 /* 643 * SpecSEI = 1 indicates that the PE might generate an SError on an 644 * external abort on speculative read. It is safe to assume that an 645 * SError might be generated than it will not be. Hence it has been 646 * classified as FTR_HIGHER_SAFE. 647 */ 648 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_HIGHER_SAFE, ID_MMFR4_EL1_SpecSEI_SHIFT, 4, 0), 649 ARM64_FTR_END, 650 }; 651 652 static const struct arm64_ftr_bits ftr_id_isar4[] = { 653 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_EL1_SWP_frac_SHIFT, 4, 0), 654 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_EL1_PSR_M_SHIFT, 4, 0), 655 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_EL1_SynchPrim_frac_SHIFT, 4, 0), 656 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_EL1_Barrier_SHIFT, 4, 0), 657 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_EL1_SMC_SHIFT, 4, 0), 658 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_EL1_Writeback_SHIFT, 4, 0), 659 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_EL1_WithShifts_SHIFT, 4, 0), 660 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_EL1_Unpriv_SHIFT, 4, 0), 661 ARM64_FTR_END, 662 }; 663 664 static const struct arm64_ftr_bits ftr_id_mmfr5[] = { 665 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR5_EL1_ETS_SHIFT, 4, 0), 666 ARM64_FTR_END, 667 }; 668 669 static const struct arm64_ftr_bits ftr_id_isar6[] = { 670 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_I8MM_SHIFT, 4, 0), 671 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_BF16_SHIFT, 4, 0), 672 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_SPECRES_SHIFT, 4, 0), 673 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_SB_SHIFT, 4, 0), 674 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_FHM_SHIFT, 4, 0), 675 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_DP_SHIFT, 4, 0), 676 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_JSCVT_SHIFT, 4, 0), 677 ARM64_FTR_END, 678 }; 679 680 static const struct arm64_ftr_bits ftr_id_pfr0[] = { 681 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_EL1_DIT_SHIFT, 4, 0), 682 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_PFR0_EL1_CSV2_SHIFT, 4, 0), 683 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_EL1_State3_SHIFT, 4, 0), 684 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_EL1_State2_SHIFT, 4, 0), 685 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_EL1_State1_SHIFT, 4, 0), 686 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_EL1_State0_SHIFT, 4, 0), 687 ARM64_FTR_END, 688 }; 689 690 static const struct arm64_ftr_bits ftr_id_pfr1[] = { 691 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_EL1_GIC_SHIFT, 4, 0), 692 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_EL1_Virt_frac_SHIFT, 4, 0), 693 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_EL1_Sec_frac_SHIFT, 4, 0), 694 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_EL1_GenTimer_SHIFT, 4, 0), 695 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_EL1_Virtualization_SHIFT, 4, 0), 696 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_EL1_MProgMod_SHIFT, 4, 0), 697 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_EL1_Security_SHIFT, 4, 0), 698 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_EL1_ProgMod_SHIFT, 4, 0), 699 ARM64_FTR_END, 700 }; 701 702 static const struct arm64_ftr_bits ftr_id_pfr2[] = { 703 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_PFR2_EL1_SSBS_SHIFT, 4, 0), 704 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_PFR2_EL1_CSV3_SHIFT, 4, 0), 705 ARM64_FTR_END, 706 }; 707 708 static const struct arm64_ftr_bits ftr_id_dfr0[] = { 709 /* [31:28] TraceFilt */ 710 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_DFR0_EL1_PerfMon_SHIFT, 4, 0), 711 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_EL1_MProfDbg_SHIFT, 4, 0), 712 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_EL1_MMapTrc_SHIFT, 4, 0), 713 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_EL1_CopTrc_SHIFT, 4, 0), 714 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_EL1_MMapDbg_SHIFT, 4, 0), 715 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_EL1_CopSDbg_SHIFT, 4, 0), 716 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_EL1_CopDbg_SHIFT, 4, 0), 717 ARM64_FTR_END, 718 }; 719 720 static const struct arm64_ftr_bits ftr_id_dfr1[] = { 721 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR1_EL1_MTPMU_SHIFT, 4, 0), 722 ARM64_FTR_END, 723 }; 724 725 static const struct arm64_ftr_bits ftr_mpamidr[] = { 726 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, MPAMIDR_EL1_PMG_MAX_SHIFT, MPAMIDR_EL1_PMG_MAX_WIDTH, 0), 727 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, MPAMIDR_EL1_VPMR_MAX_SHIFT, MPAMIDR_EL1_VPMR_MAX_WIDTH, 0), 728 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MPAMIDR_EL1_HAS_HCR_SHIFT, 1, 0), 729 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, MPAMIDR_EL1_PARTID_MAX_SHIFT, MPAMIDR_EL1_PARTID_MAX_WIDTH, 0), 730 ARM64_FTR_END, 731 }; 732 733 /* 734 * Common ftr bits for a 32bit register with all hidden, strict 735 * attributes, with 4bit feature fields and a default safe value of 736 * 0. Covers the following 32bit registers: 737 * id_isar[1-3], id_mmfr[1-3] 738 */ 739 static const struct arm64_ftr_bits ftr_generic_32bits[] = { 740 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 28, 4, 0), 741 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 24, 4, 0), 742 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 20, 4, 0), 743 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 16, 4, 0), 744 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 12, 4, 0), 745 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 8, 4, 0), 746 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0), 747 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), 748 ARM64_FTR_END, 749 }; 750 751 /* Table for a single 32bit feature value */ 752 static const struct arm64_ftr_bits ftr_single32[] = { 753 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, 0, 32, 0), 754 ARM64_FTR_END, 755 }; 756 757 static const struct arm64_ftr_bits ftr_raz[] = { 758 ARM64_FTR_END, 759 }; 760 761 #define __ARM64_FTR_REG_OVERRIDE(id_str, id, table, ovr) { \ 762 .sys_id = id, \ 763 .reg = &(struct arm64_ftr_reg){ \ 764 .name = id_str, \ 765 .override = (ovr), \ 766 .ftr_bits = &((table)[0]), \ 767 }} 768 769 #define ARM64_FTR_REG_OVERRIDE(id, table, ovr) \ 770 __ARM64_FTR_REG_OVERRIDE(#id, id, table, ovr) 771 772 #define ARM64_FTR_REG(id, table) \ 773 __ARM64_FTR_REG_OVERRIDE(#id, id, table, &no_override) 774 775 struct arm64_ftr_override __read_mostly id_aa64mmfr0_override; 776 struct arm64_ftr_override __read_mostly id_aa64mmfr1_override; 777 struct arm64_ftr_override __read_mostly id_aa64mmfr2_override; 778 struct arm64_ftr_override __read_mostly id_aa64pfr0_override; 779 struct arm64_ftr_override __read_mostly id_aa64pfr1_override; 780 struct arm64_ftr_override __read_mostly id_aa64zfr0_override; 781 struct arm64_ftr_override __read_mostly id_aa64smfr0_override; 782 struct arm64_ftr_override __read_mostly id_aa64isar1_override; 783 struct arm64_ftr_override __read_mostly id_aa64isar2_override; 784 785 struct arm64_ftr_override __read_mostly arm64_sw_feature_override; 786 787 static const struct __ftr_reg_entry { 788 u32 sys_id; 789 struct arm64_ftr_reg *reg; 790 } arm64_ftr_regs[] = { 791 792 /* Op1 = 0, CRn = 0, CRm = 1 */ 793 ARM64_FTR_REG(SYS_ID_PFR0_EL1, ftr_id_pfr0), 794 ARM64_FTR_REG(SYS_ID_PFR1_EL1, ftr_id_pfr1), 795 ARM64_FTR_REG(SYS_ID_DFR0_EL1, ftr_id_dfr0), 796 ARM64_FTR_REG(SYS_ID_MMFR0_EL1, ftr_id_mmfr0), 797 ARM64_FTR_REG(SYS_ID_MMFR1_EL1, ftr_generic_32bits), 798 ARM64_FTR_REG(SYS_ID_MMFR2_EL1, ftr_generic_32bits), 799 ARM64_FTR_REG(SYS_ID_MMFR3_EL1, ftr_generic_32bits), 800 801 /* Op1 = 0, CRn = 0, CRm = 2 */ 802 ARM64_FTR_REG(SYS_ID_ISAR0_EL1, ftr_id_isar0), 803 ARM64_FTR_REG(SYS_ID_ISAR1_EL1, ftr_generic_32bits), 804 ARM64_FTR_REG(SYS_ID_ISAR2_EL1, ftr_generic_32bits), 805 ARM64_FTR_REG(SYS_ID_ISAR3_EL1, ftr_generic_32bits), 806 ARM64_FTR_REG(SYS_ID_ISAR4_EL1, ftr_id_isar4), 807 ARM64_FTR_REG(SYS_ID_ISAR5_EL1, ftr_id_isar5), 808 ARM64_FTR_REG(SYS_ID_MMFR4_EL1, ftr_id_mmfr4), 809 ARM64_FTR_REG(SYS_ID_ISAR6_EL1, ftr_id_isar6), 810 811 /* Op1 = 0, CRn = 0, CRm = 3 */ 812 ARM64_FTR_REG(SYS_MVFR0_EL1, ftr_mvfr0), 813 ARM64_FTR_REG(SYS_MVFR1_EL1, ftr_mvfr1), 814 ARM64_FTR_REG(SYS_MVFR2_EL1, ftr_mvfr2), 815 ARM64_FTR_REG(SYS_ID_PFR2_EL1, ftr_id_pfr2), 816 ARM64_FTR_REG(SYS_ID_DFR1_EL1, ftr_id_dfr1), 817 ARM64_FTR_REG(SYS_ID_MMFR5_EL1, ftr_id_mmfr5), 818 819 /* Op1 = 0, CRn = 0, CRm = 4 */ 820 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64PFR0_EL1, ftr_id_aa64pfr0, 821 &id_aa64pfr0_override), 822 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64PFR1_EL1, ftr_id_aa64pfr1, 823 &id_aa64pfr1_override), 824 ARM64_FTR_REG(SYS_ID_AA64PFR2_EL1, ftr_id_aa64pfr2), 825 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64ZFR0_EL1, ftr_id_aa64zfr0, 826 &id_aa64zfr0_override), 827 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64SMFR0_EL1, ftr_id_aa64smfr0, 828 &id_aa64smfr0_override), 829 ARM64_FTR_REG(SYS_ID_AA64FPFR0_EL1, ftr_id_aa64fpfr0), 830 831 /* Op1 = 0, CRn = 0, CRm = 5 */ 832 ARM64_FTR_REG(SYS_ID_AA64DFR0_EL1, ftr_id_aa64dfr0), 833 ARM64_FTR_REG(SYS_ID_AA64DFR1_EL1, ftr_raz), 834 835 /* Op1 = 0, CRn = 0, CRm = 6 */ 836 ARM64_FTR_REG(SYS_ID_AA64ISAR0_EL1, ftr_id_aa64isar0), 837 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64ISAR1_EL1, ftr_id_aa64isar1, 838 &id_aa64isar1_override), 839 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64ISAR2_EL1, ftr_id_aa64isar2, 840 &id_aa64isar2_override), 841 ARM64_FTR_REG(SYS_ID_AA64ISAR3_EL1, ftr_id_aa64isar3), 842 843 /* Op1 = 0, CRn = 0, CRm = 7 */ 844 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64MMFR0_EL1, ftr_id_aa64mmfr0, 845 &id_aa64mmfr0_override), 846 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64MMFR1_EL1, ftr_id_aa64mmfr1, 847 &id_aa64mmfr1_override), 848 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64MMFR2_EL1, ftr_id_aa64mmfr2, 849 &id_aa64mmfr2_override), 850 ARM64_FTR_REG(SYS_ID_AA64MMFR3_EL1, ftr_id_aa64mmfr3), 851 ARM64_FTR_REG(SYS_ID_AA64MMFR4_EL1, ftr_id_aa64mmfr4), 852 853 /* Op1 = 0, CRn = 10, CRm = 4 */ 854 ARM64_FTR_REG(SYS_MPAMIDR_EL1, ftr_mpamidr), 855 856 /* Op1 = 1, CRn = 0, CRm = 0 */ 857 ARM64_FTR_REG(SYS_GMID_EL1, ftr_gmid), 858 859 /* Op1 = 3, CRn = 0, CRm = 0 */ 860 { SYS_CTR_EL0, &arm64_ftr_reg_ctrel0 }, 861 ARM64_FTR_REG(SYS_DCZID_EL0, ftr_dczid), 862 863 /* Op1 = 3, CRn = 14, CRm = 0 */ 864 ARM64_FTR_REG(SYS_CNTFRQ_EL0, ftr_single32), 865 }; 866 867 static int search_cmp_ftr_reg(const void *id, const void *regp) 868 { 869 return (int)(unsigned long)id - (int)((const struct __ftr_reg_entry *)regp)->sys_id; 870 } 871 872 /* 873 * get_arm64_ftr_reg_nowarn - Looks up a feature register entry using 874 * its sys_reg() encoding. With the array arm64_ftr_regs sorted in the 875 * ascending order of sys_id, we use binary search to find a matching 876 * entry. 877 * 878 * returns - Upon success, matching ftr_reg entry for id. 879 * - NULL on failure. It is upto the caller to decide 880 * the impact of a failure. 881 */ 882 static struct arm64_ftr_reg *get_arm64_ftr_reg_nowarn(u32 sys_id) 883 { 884 const struct __ftr_reg_entry *ret; 885 886 ret = bsearch((const void *)(unsigned long)sys_id, 887 arm64_ftr_regs, 888 ARRAY_SIZE(arm64_ftr_regs), 889 sizeof(arm64_ftr_regs[0]), 890 search_cmp_ftr_reg); 891 if (ret) 892 return ret->reg; 893 return NULL; 894 } 895 896 /* 897 * get_arm64_ftr_reg - Looks up a feature register entry using 898 * its sys_reg() encoding. This calls get_arm64_ftr_reg_nowarn(). 899 * 900 * returns - Upon success, matching ftr_reg entry for id. 901 * - NULL on failure but with an WARN_ON(). 902 */ 903 struct arm64_ftr_reg *get_arm64_ftr_reg(u32 sys_id) 904 { 905 struct arm64_ftr_reg *reg; 906 907 reg = get_arm64_ftr_reg_nowarn(sys_id); 908 909 /* 910 * Requesting a non-existent register search is an error. Warn 911 * and let the caller handle it. 912 */ 913 WARN_ON(!reg); 914 return reg; 915 } 916 917 static u64 arm64_ftr_set_value(const struct arm64_ftr_bits *ftrp, s64 reg, 918 s64 ftr_val) 919 { 920 u64 mask = arm64_ftr_mask(ftrp); 921 922 reg &= ~mask; 923 reg |= (ftr_val << ftrp->shift) & mask; 924 return reg; 925 } 926 927 s64 arm64_ftr_safe_value(const struct arm64_ftr_bits *ftrp, s64 new, 928 s64 cur) 929 { 930 s64 ret = 0; 931 932 switch (ftrp->type) { 933 case FTR_EXACT: 934 ret = ftrp->safe_val; 935 break; 936 case FTR_LOWER_SAFE: 937 ret = min(new, cur); 938 break; 939 case FTR_HIGHER_OR_ZERO_SAFE: 940 if (!cur || !new) 941 break; 942 fallthrough; 943 case FTR_HIGHER_SAFE: 944 ret = max(new, cur); 945 break; 946 default: 947 BUG(); 948 } 949 950 return ret; 951 } 952 953 static void __init sort_ftr_regs(void) 954 { 955 unsigned int i; 956 957 for (i = 0; i < ARRAY_SIZE(arm64_ftr_regs); i++) { 958 const struct arm64_ftr_reg *ftr_reg = arm64_ftr_regs[i].reg; 959 const struct arm64_ftr_bits *ftr_bits = ftr_reg->ftr_bits; 960 unsigned int j = 0; 961 962 /* 963 * Features here must be sorted in descending order with respect 964 * to their shift values and should not overlap with each other. 965 */ 966 for (; ftr_bits->width != 0; ftr_bits++, j++) { 967 unsigned int width = ftr_reg->ftr_bits[j].width; 968 unsigned int shift = ftr_reg->ftr_bits[j].shift; 969 unsigned int prev_shift; 970 971 WARN((shift + width) > 64, 972 "%s has invalid feature at shift %d\n", 973 ftr_reg->name, shift); 974 975 /* 976 * Skip the first feature. There is nothing to 977 * compare against for now. 978 */ 979 if (j == 0) 980 continue; 981 982 prev_shift = ftr_reg->ftr_bits[j - 1].shift; 983 WARN((shift + width) > prev_shift, 984 "%s has feature overlap at shift %d\n", 985 ftr_reg->name, shift); 986 } 987 988 /* 989 * Skip the first register. There is nothing to 990 * compare against for now. 991 */ 992 if (i == 0) 993 continue; 994 /* 995 * Registers here must be sorted in ascending order with respect 996 * to sys_id for subsequent binary search in get_arm64_ftr_reg() 997 * to work correctly. 998 */ 999 BUG_ON(arm64_ftr_regs[i].sys_id <= arm64_ftr_regs[i - 1].sys_id); 1000 } 1001 } 1002 1003 /* 1004 * Initialise the CPU feature register from Boot CPU values. 1005 * Also initiliases the strict_mask for the register. 1006 * Any bits that are not covered by an arm64_ftr_bits entry are considered 1007 * RES0 for the system-wide value, and must strictly match. 1008 */ 1009 static void init_cpu_ftr_reg(u32 sys_reg, u64 new) 1010 { 1011 u64 val = 0; 1012 u64 strict_mask = ~0x0ULL; 1013 u64 user_mask = 0; 1014 u64 valid_mask = 0; 1015 1016 const struct arm64_ftr_bits *ftrp; 1017 struct arm64_ftr_reg *reg = get_arm64_ftr_reg(sys_reg); 1018 1019 if (!reg) 1020 return; 1021 1022 for (ftrp = reg->ftr_bits; ftrp->width; ftrp++) { 1023 u64 ftr_mask = arm64_ftr_mask(ftrp); 1024 s64 ftr_new = arm64_ftr_value(ftrp, new); 1025 s64 ftr_ovr = arm64_ftr_value(ftrp, reg->override->val); 1026 1027 if ((ftr_mask & reg->override->mask) == ftr_mask) { 1028 s64 tmp = arm64_ftr_safe_value(ftrp, ftr_ovr, ftr_new); 1029 char *str = NULL; 1030 1031 if (ftr_ovr != tmp) { 1032 /* Unsafe, remove the override */ 1033 reg->override->mask &= ~ftr_mask; 1034 reg->override->val &= ~ftr_mask; 1035 tmp = ftr_ovr; 1036 str = "ignoring override"; 1037 } else if (ftr_new != tmp) { 1038 /* Override was valid */ 1039 ftr_new = tmp; 1040 str = "forced"; 1041 } else { 1042 /* Override was the safe value */ 1043 str = "already set"; 1044 } 1045 1046 pr_warn("%s[%d:%d]: %s to %llx\n", 1047 reg->name, 1048 ftrp->shift + ftrp->width - 1, 1049 ftrp->shift, str, 1050 tmp & (BIT(ftrp->width) - 1)); 1051 } else if ((ftr_mask & reg->override->val) == ftr_mask) { 1052 reg->override->val &= ~ftr_mask; 1053 pr_warn("%s[%d:%d]: impossible override, ignored\n", 1054 reg->name, 1055 ftrp->shift + ftrp->width - 1, 1056 ftrp->shift); 1057 } 1058 1059 val = arm64_ftr_set_value(ftrp, val, ftr_new); 1060 1061 valid_mask |= ftr_mask; 1062 if (!ftrp->strict) 1063 strict_mask &= ~ftr_mask; 1064 if (ftrp->visible) 1065 user_mask |= ftr_mask; 1066 else 1067 reg->user_val = arm64_ftr_set_value(ftrp, 1068 reg->user_val, 1069 ftrp->safe_val); 1070 } 1071 1072 val &= valid_mask; 1073 1074 reg->sys_val = val; 1075 reg->strict_mask = strict_mask; 1076 reg->user_mask = user_mask; 1077 } 1078 1079 extern const struct arm64_cpu_capabilities arm64_errata[]; 1080 static const struct arm64_cpu_capabilities arm64_features[]; 1081 1082 static void __init 1083 init_cpucap_indirect_list_from_array(const struct arm64_cpu_capabilities *caps) 1084 { 1085 for (; caps->matches; caps++) { 1086 if (WARN(caps->capability >= ARM64_NCAPS, 1087 "Invalid capability %d\n", caps->capability)) 1088 continue; 1089 if (WARN(cpucap_ptrs[caps->capability], 1090 "Duplicate entry for capability %d\n", 1091 caps->capability)) 1092 continue; 1093 cpucap_ptrs[caps->capability] = caps; 1094 } 1095 } 1096 1097 static void __init init_cpucap_indirect_list(void) 1098 { 1099 init_cpucap_indirect_list_from_array(arm64_features); 1100 init_cpucap_indirect_list_from_array(arm64_errata); 1101 } 1102 1103 static void __init setup_boot_cpu_capabilities(void); 1104 1105 static void init_32bit_cpu_features(struct cpuinfo_32bit *info) 1106 { 1107 init_cpu_ftr_reg(SYS_ID_DFR0_EL1, info->reg_id_dfr0); 1108 init_cpu_ftr_reg(SYS_ID_DFR1_EL1, info->reg_id_dfr1); 1109 init_cpu_ftr_reg(SYS_ID_ISAR0_EL1, info->reg_id_isar0); 1110 init_cpu_ftr_reg(SYS_ID_ISAR1_EL1, info->reg_id_isar1); 1111 init_cpu_ftr_reg(SYS_ID_ISAR2_EL1, info->reg_id_isar2); 1112 init_cpu_ftr_reg(SYS_ID_ISAR3_EL1, info->reg_id_isar3); 1113 init_cpu_ftr_reg(SYS_ID_ISAR4_EL1, info->reg_id_isar4); 1114 init_cpu_ftr_reg(SYS_ID_ISAR5_EL1, info->reg_id_isar5); 1115 init_cpu_ftr_reg(SYS_ID_ISAR6_EL1, info->reg_id_isar6); 1116 init_cpu_ftr_reg(SYS_ID_MMFR0_EL1, info->reg_id_mmfr0); 1117 init_cpu_ftr_reg(SYS_ID_MMFR1_EL1, info->reg_id_mmfr1); 1118 init_cpu_ftr_reg(SYS_ID_MMFR2_EL1, info->reg_id_mmfr2); 1119 init_cpu_ftr_reg(SYS_ID_MMFR3_EL1, info->reg_id_mmfr3); 1120 init_cpu_ftr_reg(SYS_ID_MMFR4_EL1, info->reg_id_mmfr4); 1121 init_cpu_ftr_reg(SYS_ID_MMFR5_EL1, info->reg_id_mmfr5); 1122 init_cpu_ftr_reg(SYS_ID_PFR0_EL1, info->reg_id_pfr0); 1123 init_cpu_ftr_reg(SYS_ID_PFR1_EL1, info->reg_id_pfr1); 1124 init_cpu_ftr_reg(SYS_ID_PFR2_EL1, info->reg_id_pfr2); 1125 init_cpu_ftr_reg(SYS_MVFR0_EL1, info->reg_mvfr0); 1126 init_cpu_ftr_reg(SYS_MVFR1_EL1, info->reg_mvfr1); 1127 init_cpu_ftr_reg(SYS_MVFR2_EL1, info->reg_mvfr2); 1128 } 1129 1130 #ifdef CONFIG_ARM64_PSEUDO_NMI 1131 static bool enable_pseudo_nmi; 1132 1133 static int __init early_enable_pseudo_nmi(char *p) 1134 { 1135 return kstrtobool(p, &enable_pseudo_nmi); 1136 } 1137 early_param("irqchip.gicv3_pseudo_nmi", early_enable_pseudo_nmi); 1138 1139 static __init void detect_system_supports_pseudo_nmi(void) 1140 { 1141 struct device_node *np; 1142 1143 if (!enable_pseudo_nmi) 1144 return; 1145 1146 /* 1147 * Detect broken MediaTek firmware that doesn't properly save and 1148 * restore GIC priorities. 1149 */ 1150 np = of_find_compatible_node(NULL, NULL, "arm,gic-v3"); 1151 if (np && of_property_read_bool(np, "mediatek,broken-save-restore-fw")) { 1152 pr_info("Pseudo-NMI disabled due to MediaTek Chromebook GICR save problem\n"); 1153 enable_pseudo_nmi = false; 1154 } 1155 of_node_put(np); 1156 } 1157 #else /* CONFIG_ARM64_PSEUDO_NMI */ 1158 static inline void detect_system_supports_pseudo_nmi(void) { } 1159 #endif 1160 1161 void __init init_cpu_features(struct cpuinfo_arm64 *info) 1162 { 1163 /* Before we start using the tables, make sure it is sorted */ 1164 sort_ftr_regs(); 1165 1166 init_cpu_ftr_reg(SYS_CTR_EL0, info->reg_ctr); 1167 init_cpu_ftr_reg(SYS_DCZID_EL0, info->reg_dczid); 1168 init_cpu_ftr_reg(SYS_CNTFRQ_EL0, info->reg_cntfrq); 1169 init_cpu_ftr_reg(SYS_ID_AA64DFR0_EL1, info->reg_id_aa64dfr0); 1170 init_cpu_ftr_reg(SYS_ID_AA64DFR1_EL1, info->reg_id_aa64dfr1); 1171 init_cpu_ftr_reg(SYS_ID_AA64ISAR0_EL1, info->reg_id_aa64isar0); 1172 init_cpu_ftr_reg(SYS_ID_AA64ISAR1_EL1, info->reg_id_aa64isar1); 1173 init_cpu_ftr_reg(SYS_ID_AA64ISAR2_EL1, info->reg_id_aa64isar2); 1174 init_cpu_ftr_reg(SYS_ID_AA64ISAR3_EL1, info->reg_id_aa64isar3); 1175 init_cpu_ftr_reg(SYS_ID_AA64MMFR0_EL1, info->reg_id_aa64mmfr0); 1176 init_cpu_ftr_reg(SYS_ID_AA64MMFR1_EL1, info->reg_id_aa64mmfr1); 1177 init_cpu_ftr_reg(SYS_ID_AA64MMFR2_EL1, info->reg_id_aa64mmfr2); 1178 init_cpu_ftr_reg(SYS_ID_AA64MMFR3_EL1, info->reg_id_aa64mmfr3); 1179 init_cpu_ftr_reg(SYS_ID_AA64MMFR4_EL1, info->reg_id_aa64mmfr4); 1180 init_cpu_ftr_reg(SYS_ID_AA64PFR0_EL1, info->reg_id_aa64pfr0); 1181 init_cpu_ftr_reg(SYS_ID_AA64PFR1_EL1, info->reg_id_aa64pfr1); 1182 init_cpu_ftr_reg(SYS_ID_AA64PFR2_EL1, info->reg_id_aa64pfr2); 1183 init_cpu_ftr_reg(SYS_ID_AA64ZFR0_EL1, info->reg_id_aa64zfr0); 1184 init_cpu_ftr_reg(SYS_ID_AA64SMFR0_EL1, info->reg_id_aa64smfr0); 1185 init_cpu_ftr_reg(SYS_ID_AA64FPFR0_EL1, info->reg_id_aa64fpfr0); 1186 1187 if (id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0)) 1188 init_32bit_cpu_features(&info->aarch32); 1189 1190 if (IS_ENABLED(CONFIG_ARM64_SVE) && 1191 id_aa64pfr0_sve(read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1))) { 1192 unsigned long cpacr = cpacr_save_enable_kernel_sve(); 1193 1194 vec_init_vq_map(ARM64_VEC_SVE); 1195 1196 cpacr_restore(cpacr); 1197 } 1198 1199 if (IS_ENABLED(CONFIG_ARM64_SME) && 1200 id_aa64pfr1_sme(read_sanitised_ftr_reg(SYS_ID_AA64PFR1_EL1))) { 1201 unsigned long cpacr = cpacr_save_enable_kernel_sme(); 1202 1203 vec_init_vq_map(ARM64_VEC_SME); 1204 1205 cpacr_restore(cpacr); 1206 } 1207 1208 if (id_aa64pfr0_mpam(read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1))) { 1209 info->reg_mpamidr = read_cpuid(MPAMIDR_EL1); 1210 init_cpu_ftr_reg(SYS_MPAMIDR_EL1, info->reg_mpamidr); 1211 } 1212 1213 if (id_aa64pfr1_mte(info->reg_id_aa64pfr1)) 1214 init_cpu_ftr_reg(SYS_GMID_EL1, info->reg_gmid); 1215 } 1216 1217 static void update_cpu_ftr_reg(struct arm64_ftr_reg *reg, u64 new) 1218 { 1219 const struct arm64_ftr_bits *ftrp; 1220 1221 for (ftrp = reg->ftr_bits; ftrp->width; ftrp++) { 1222 s64 ftr_cur = arm64_ftr_value(ftrp, reg->sys_val); 1223 s64 ftr_new = arm64_ftr_value(ftrp, new); 1224 1225 if (ftr_cur == ftr_new) 1226 continue; 1227 /* Find a safe value */ 1228 ftr_new = arm64_ftr_safe_value(ftrp, ftr_new, ftr_cur); 1229 reg->sys_val = arm64_ftr_set_value(ftrp, reg->sys_val, ftr_new); 1230 } 1231 1232 } 1233 1234 static int check_update_ftr_reg(u32 sys_id, int cpu, u64 val, u64 boot) 1235 { 1236 struct arm64_ftr_reg *regp = get_arm64_ftr_reg(sys_id); 1237 1238 if (!regp) 1239 return 0; 1240 1241 update_cpu_ftr_reg(regp, val); 1242 if ((boot & regp->strict_mask) == (val & regp->strict_mask)) 1243 return 0; 1244 pr_warn("SANITY CHECK: Unexpected variation in %s. Boot CPU: %#016llx, CPU%d: %#016llx\n", 1245 regp->name, boot, cpu, val); 1246 return 1; 1247 } 1248 1249 static void relax_cpu_ftr_reg(u32 sys_id, int field) 1250 { 1251 const struct arm64_ftr_bits *ftrp; 1252 struct arm64_ftr_reg *regp = get_arm64_ftr_reg(sys_id); 1253 1254 if (!regp) 1255 return; 1256 1257 for (ftrp = regp->ftr_bits; ftrp->width; ftrp++) { 1258 if (ftrp->shift == field) { 1259 regp->strict_mask &= ~arm64_ftr_mask(ftrp); 1260 break; 1261 } 1262 } 1263 1264 /* Bogus field? */ 1265 WARN_ON(!ftrp->width); 1266 } 1267 1268 static void lazy_init_32bit_cpu_features(struct cpuinfo_arm64 *info, 1269 struct cpuinfo_arm64 *boot) 1270 { 1271 static bool boot_cpu_32bit_regs_overridden = false; 1272 1273 if (!allow_mismatched_32bit_el0 || boot_cpu_32bit_regs_overridden) 1274 return; 1275 1276 if (id_aa64pfr0_32bit_el0(boot->reg_id_aa64pfr0)) 1277 return; 1278 1279 boot->aarch32 = info->aarch32; 1280 init_32bit_cpu_features(&boot->aarch32); 1281 boot_cpu_32bit_regs_overridden = true; 1282 } 1283 1284 static int update_32bit_cpu_features(int cpu, struct cpuinfo_32bit *info, 1285 struct cpuinfo_32bit *boot) 1286 { 1287 int taint = 0; 1288 u64 pfr0 = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1); 1289 1290 /* 1291 * If we don't have AArch32 at EL1, then relax the strictness of 1292 * EL1-dependent register fields to avoid spurious sanity check fails. 1293 */ 1294 if (!id_aa64pfr0_32bit_el1(pfr0)) { 1295 relax_cpu_ftr_reg(SYS_ID_ISAR4_EL1, ID_ISAR4_EL1_SMC_SHIFT); 1296 relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_EL1_Virt_frac_SHIFT); 1297 relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_EL1_Sec_frac_SHIFT); 1298 relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_EL1_Virtualization_SHIFT); 1299 relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_EL1_Security_SHIFT); 1300 relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_EL1_ProgMod_SHIFT); 1301 } 1302 1303 taint |= check_update_ftr_reg(SYS_ID_DFR0_EL1, cpu, 1304 info->reg_id_dfr0, boot->reg_id_dfr0); 1305 taint |= check_update_ftr_reg(SYS_ID_DFR1_EL1, cpu, 1306 info->reg_id_dfr1, boot->reg_id_dfr1); 1307 taint |= check_update_ftr_reg(SYS_ID_ISAR0_EL1, cpu, 1308 info->reg_id_isar0, boot->reg_id_isar0); 1309 taint |= check_update_ftr_reg(SYS_ID_ISAR1_EL1, cpu, 1310 info->reg_id_isar1, boot->reg_id_isar1); 1311 taint |= check_update_ftr_reg(SYS_ID_ISAR2_EL1, cpu, 1312 info->reg_id_isar2, boot->reg_id_isar2); 1313 taint |= check_update_ftr_reg(SYS_ID_ISAR3_EL1, cpu, 1314 info->reg_id_isar3, boot->reg_id_isar3); 1315 taint |= check_update_ftr_reg(SYS_ID_ISAR4_EL1, cpu, 1316 info->reg_id_isar4, boot->reg_id_isar4); 1317 taint |= check_update_ftr_reg(SYS_ID_ISAR5_EL1, cpu, 1318 info->reg_id_isar5, boot->reg_id_isar5); 1319 taint |= check_update_ftr_reg(SYS_ID_ISAR6_EL1, cpu, 1320 info->reg_id_isar6, boot->reg_id_isar6); 1321 1322 /* 1323 * Regardless of the value of the AuxReg field, the AIFSR, ADFSR, and 1324 * ACTLR formats could differ across CPUs and therefore would have to 1325 * be trapped for virtualization anyway. 1326 */ 1327 taint |= check_update_ftr_reg(SYS_ID_MMFR0_EL1, cpu, 1328 info->reg_id_mmfr0, boot->reg_id_mmfr0); 1329 taint |= check_update_ftr_reg(SYS_ID_MMFR1_EL1, cpu, 1330 info->reg_id_mmfr1, boot->reg_id_mmfr1); 1331 taint |= check_update_ftr_reg(SYS_ID_MMFR2_EL1, cpu, 1332 info->reg_id_mmfr2, boot->reg_id_mmfr2); 1333 taint |= check_update_ftr_reg(SYS_ID_MMFR3_EL1, cpu, 1334 info->reg_id_mmfr3, boot->reg_id_mmfr3); 1335 taint |= check_update_ftr_reg(SYS_ID_MMFR4_EL1, cpu, 1336 info->reg_id_mmfr4, boot->reg_id_mmfr4); 1337 taint |= check_update_ftr_reg(SYS_ID_MMFR5_EL1, cpu, 1338 info->reg_id_mmfr5, boot->reg_id_mmfr5); 1339 taint |= check_update_ftr_reg(SYS_ID_PFR0_EL1, cpu, 1340 info->reg_id_pfr0, boot->reg_id_pfr0); 1341 taint |= check_update_ftr_reg(SYS_ID_PFR1_EL1, cpu, 1342 info->reg_id_pfr1, boot->reg_id_pfr1); 1343 taint |= check_update_ftr_reg(SYS_ID_PFR2_EL1, cpu, 1344 info->reg_id_pfr2, boot->reg_id_pfr2); 1345 taint |= check_update_ftr_reg(SYS_MVFR0_EL1, cpu, 1346 info->reg_mvfr0, boot->reg_mvfr0); 1347 taint |= check_update_ftr_reg(SYS_MVFR1_EL1, cpu, 1348 info->reg_mvfr1, boot->reg_mvfr1); 1349 taint |= check_update_ftr_reg(SYS_MVFR2_EL1, cpu, 1350 info->reg_mvfr2, boot->reg_mvfr2); 1351 1352 return taint; 1353 } 1354 1355 /* 1356 * Update system wide CPU feature registers with the values from a 1357 * non-boot CPU. Also performs SANITY checks to make sure that there 1358 * aren't any insane variations from that of the boot CPU. 1359 */ 1360 void update_cpu_features(int cpu, 1361 struct cpuinfo_arm64 *info, 1362 struct cpuinfo_arm64 *boot) 1363 { 1364 int taint = 0; 1365 1366 /* 1367 * The kernel can handle differing I-cache policies, but otherwise 1368 * caches should look identical. Userspace JITs will make use of 1369 * *minLine. 1370 */ 1371 taint |= check_update_ftr_reg(SYS_CTR_EL0, cpu, 1372 info->reg_ctr, boot->reg_ctr); 1373 1374 /* 1375 * Userspace may perform DC ZVA instructions. Mismatched block sizes 1376 * could result in too much or too little memory being zeroed if a 1377 * process is preempted and migrated between CPUs. 1378 */ 1379 taint |= check_update_ftr_reg(SYS_DCZID_EL0, cpu, 1380 info->reg_dczid, boot->reg_dczid); 1381 1382 /* If different, timekeeping will be broken (especially with KVM) */ 1383 taint |= check_update_ftr_reg(SYS_CNTFRQ_EL0, cpu, 1384 info->reg_cntfrq, boot->reg_cntfrq); 1385 1386 /* 1387 * The kernel uses self-hosted debug features and expects CPUs to 1388 * support identical debug features. We presently need CTX_CMPs, WRPs, 1389 * and BRPs to be identical. 1390 * ID_AA64DFR1 is currently RES0. 1391 */ 1392 taint |= check_update_ftr_reg(SYS_ID_AA64DFR0_EL1, cpu, 1393 info->reg_id_aa64dfr0, boot->reg_id_aa64dfr0); 1394 taint |= check_update_ftr_reg(SYS_ID_AA64DFR1_EL1, cpu, 1395 info->reg_id_aa64dfr1, boot->reg_id_aa64dfr1); 1396 /* 1397 * Even in big.LITTLE, processors should be identical instruction-set 1398 * wise. 1399 */ 1400 taint |= check_update_ftr_reg(SYS_ID_AA64ISAR0_EL1, cpu, 1401 info->reg_id_aa64isar0, boot->reg_id_aa64isar0); 1402 taint |= check_update_ftr_reg(SYS_ID_AA64ISAR1_EL1, cpu, 1403 info->reg_id_aa64isar1, boot->reg_id_aa64isar1); 1404 taint |= check_update_ftr_reg(SYS_ID_AA64ISAR2_EL1, cpu, 1405 info->reg_id_aa64isar2, boot->reg_id_aa64isar2); 1406 taint |= check_update_ftr_reg(SYS_ID_AA64ISAR3_EL1, cpu, 1407 info->reg_id_aa64isar3, boot->reg_id_aa64isar3); 1408 1409 /* 1410 * Differing PARange support is fine as long as all peripherals and 1411 * memory are mapped within the minimum PARange of all CPUs. 1412 * Linux should not care about secure memory. 1413 */ 1414 taint |= check_update_ftr_reg(SYS_ID_AA64MMFR0_EL1, cpu, 1415 info->reg_id_aa64mmfr0, boot->reg_id_aa64mmfr0); 1416 taint |= check_update_ftr_reg(SYS_ID_AA64MMFR1_EL1, cpu, 1417 info->reg_id_aa64mmfr1, boot->reg_id_aa64mmfr1); 1418 taint |= check_update_ftr_reg(SYS_ID_AA64MMFR2_EL1, cpu, 1419 info->reg_id_aa64mmfr2, boot->reg_id_aa64mmfr2); 1420 taint |= check_update_ftr_reg(SYS_ID_AA64MMFR3_EL1, cpu, 1421 info->reg_id_aa64mmfr3, boot->reg_id_aa64mmfr3); 1422 taint |= check_update_ftr_reg(SYS_ID_AA64MMFR4_EL1, cpu, 1423 info->reg_id_aa64mmfr4, boot->reg_id_aa64mmfr4); 1424 1425 taint |= check_update_ftr_reg(SYS_ID_AA64PFR0_EL1, cpu, 1426 info->reg_id_aa64pfr0, boot->reg_id_aa64pfr0); 1427 taint |= check_update_ftr_reg(SYS_ID_AA64PFR1_EL1, cpu, 1428 info->reg_id_aa64pfr1, boot->reg_id_aa64pfr1); 1429 taint |= check_update_ftr_reg(SYS_ID_AA64PFR2_EL1, cpu, 1430 info->reg_id_aa64pfr2, boot->reg_id_aa64pfr2); 1431 1432 taint |= check_update_ftr_reg(SYS_ID_AA64ZFR0_EL1, cpu, 1433 info->reg_id_aa64zfr0, boot->reg_id_aa64zfr0); 1434 1435 taint |= check_update_ftr_reg(SYS_ID_AA64SMFR0_EL1, cpu, 1436 info->reg_id_aa64smfr0, boot->reg_id_aa64smfr0); 1437 1438 taint |= check_update_ftr_reg(SYS_ID_AA64FPFR0_EL1, cpu, 1439 info->reg_id_aa64fpfr0, boot->reg_id_aa64fpfr0); 1440 1441 /* Probe vector lengths */ 1442 if (IS_ENABLED(CONFIG_ARM64_SVE) && 1443 id_aa64pfr0_sve(read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1))) { 1444 if (!system_capabilities_finalized()) { 1445 unsigned long cpacr = cpacr_save_enable_kernel_sve(); 1446 1447 vec_update_vq_map(ARM64_VEC_SVE); 1448 1449 cpacr_restore(cpacr); 1450 } 1451 } 1452 1453 if (IS_ENABLED(CONFIG_ARM64_SME) && 1454 id_aa64pfr1_sme(read_sanitised_ftr_reg(SYS_ID_AA64PFR1_EL1))) { 1455 unsigned long cpacr = cpacr_save_enable_kernel_sme(); 1456 1457 /* Probe vector lengths */ 1458 if (!system_capabilities_finalized()) 1459 vec_update_vq_map(ARM64_VEC_SME); 1460 1461 cpacr_restore(cpacr); 1462 } 1463 1464 if (id_aa64pfr0_mpam(read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1))) { 1465 info->reg_mpamidr = read_cpuid(MPAMIDR_EL1); 1466 taint |= check_update_ftr_reg(SYS_MPAMIDR_EL1, cpu, 1467 info->reg_mpamidr, boot->reg_mpamidr); 1468 } 1469 1470 /* 1471 * The kernel uses the LDGM/STGM instructions and the number of tags 1472 * they read/write depends on the GMID_EL1.BS field. Check that the 1473 * value is the same on all CPUs. 1474 */ 1475 if (IS_ENABLED(CONFIG_ARM64_MTE) && 1476 id_aa64pfr1_mte(info->reg_id_aa64pfr1)) { 1477 taint |= check_update_ftr_reg(SYS_GMID_EL1, cpu, 1478 info->reg_gmid, boot->reg_gmid); 1479 } 1480 1481 /* 1482 * If we don't have AArch32 at all then skip the checks entirely 1483 * as the register values may be UNKNOWN and we're not going to be 1484 * using them for anything. 1485 * 1486 * This relies on a sanitised view of the AArch64 ID registers 1487 * (e.g. SYS_ID_AA64PFR0_EL1), so we call it last. 1488 */ 1489 if (id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0)) { 1490 lazy_init_32bit_cpu_features(info, boot); 1491 taint |= update_32bit_cpu_features(cpu, &info->aarch32, 1492 &boot->aarch32); 1493 } 1494 1495 /* 1496 * Mismatched CPU features are a recipe for disaster. Don't even 1497 * pretend to support them. 1498 */ 1499 if (taint) { 1500 pr_warn_once("Unsupported CPU feature variation detected.\n"); 1501 add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_STILL_OK); 1502 } 1503 } 1504 1505 u64 read_sanitised_ftr_reg(u32 id) 1506 { 1507 struct arm64_ftr_reg *regp = get_arm64_ftr_reg(id); 1508 1509 if (!regp) 1510 return 0; 1511 return regp->sys_val; 1512 } 1513 EXPORT_SYMBOL_GPL(read_sanitised_ftr_reg); 1514 1515 #define read_sysreg_case(r) \ 1516 case r: val = read_sysreg_s(r); break; 1517 1518 /* 1519 * __read_sysreg_by_encoding() - Used by a STARTING cpu before cpuinfo is populated. 1520 * Read the system register on the current CPU 1521 */ 1522 u64 __read_sysreg_by_encoding(u32 sys_id) 1523 { 1524 struct arm64_ftr_reg *regp; 1525 u64 val; 1526 1527 switch (sys_id) { 1528 read_sysreg_case(SYS_ID_PFR0_EL1); 1529 read_sysreg_case(SYS_ID_PFR1_EL1); 1530 read_sysreg_case(SYS_ID_PFR2_EL1); 1531 read_sysreg_case(SYS_ID_DFR0_EL1); 1532 read_sysreg_case(SYS_ID_DFR1_EL1); 1533 read_sysreg_case(SYS_ID_MMFR0_EL1); 1534 read_sysreg_case(SYS_ID_MMFR1_EL1); 1535 read_sysreg_case(SYS_ID_MMFR2_EL1); 1536 read_sysreg_case(SYS_ID_MMFR3_EL1); 1537 read_sysreg_case(SYS_ID_MMFR4_EL1); 1538 read_sysreg_case(SYS_ID_MMFR5_EL1); 1539 read_sysreg_case(SYS_ID_ISAR0_EL1); 1540 read_sysreg_case(SYS_ID_ISAR1_EL1); 1541 read_sysreg_case(SYS_ID_ISAR2_EL1); 1542 read_sysreg_case(SYS_ID_ISAR3_EL1); 1543 read_sysreg_case(SYS_ID_ISAR4_EL1); 1544 read_sysreg_case(SYS_ID_ISAR5_EL1); 1545 read_sysreg_case(SYS_ID_ISAR6_EL1); 1546 read_sysreg_case(SYS_MVFR0_EL1); 1547 read_sysreg_case(SYS_MVFR1_EL1); 1548 read_sysreg_case(SYS_MVFR2_EL1); 1549 1550 read_sysreg_case(SYS_ID_AA64PFR0_EL1); 1551 read_sysreg_case(SYS_ID_AA64PFR1_EL1); 1552 read_sysreg_case(SYS_ID_AA64PFR2_EL1); 1553 read_sysreg_case(SYS_ID_AA64ZFR0_EL1); 1554 read_sysreg_case(SYS_ID_AA64SMFR0_EL1); 1555 read_sysreg_case(SYS_ID_AA64FPFR0_EL1); 1556 read_sysreg_case(SYS_ID_AA64DFR0_EL1); 1557 read_sysreg_case(SYS_ID_AA64DFR1_EL1); 1558 read_sysreg_case(SYS_ID_AA64MMFR0_EL1); 1559 read_sysreg_case(SYS_ID_AA64MMFR1_EL1); 1560 read_sysreg_case(SYS_ID_AA64MMFR2_EL1); 1561 read_sysreg_case(SYS_ID_AA64MMFR3_EL1); 1562 read_sysreg_case(SYS_ID_AA64MMFR4_EL1); 1563 read_sysreg_case(SYS_ID_AA64ISAR0_EL1); 1564 read_sysreg_case(SYS_ID_AA64ISAR1_EL1); 1565 read_sysreg_case(SYS_ID_AA64ISAR2_EL1); 1566 read_sysreg_case(SYS_ID_AA64ISAR3_EL1); 1567 1568 read_sysreg_case(SYS_CNTFRQ_EL0); 1569 read_sysreg_case(SYS_CTR_EL0); 1570 read_sysreg_case(SYS_DCZID_EL0); 1571 1572 default: 1573 BUG(); 1574 return 0; 1575 } 1576 1577 regp = get_arm64_ftr_reg(sys_id); 1578 if (regp) { 1579 val &= ~regp->override->mask; 1580 val |= (regp->override->val & regp->override->mask); 1581 } 1582 1583 return val; 1584 } 1585 1586 #include <linux/irqchip/arm-gic-v3.h> 1587 1588 static bool 1589 has_always(const struct arm64_cpu_capabilities *entry, int scope) 1590 { 1591 return true; 1592 } 1593 1594 static bool 1595 feature_matches(u64 reg, const struct arm64_cpu_capabilities *entry) 1596 { 1597 int val, min, max; 1598 u64 tmp; 1599 1600 val = cpuid_feature_extract_field_width(reg, entry->field_pos, 1601 entry->field_width, 1602 entry->sign); 1603 1604 tmp = entry->min_field_value; 1605 tmp <<= entry->field_pos; 1606 1607 min = cpuid_feature_extract_field_width(tmp, entry->field_pos, 1608 entry->field_width, 1609 entry->sign); 1610 1611 tmp = entry->max_field_value; 1612 tmp <<= entry->field_pos; 1613 1614 max = cpuid_feature_extract_field_width(tmp, entry->field_pos, 1615 entry->field_width, 1616 entry->sign); 1617 1618 return val >= min && val <= max; 1619 } 1620 1621 static u64 1622 read_scoped_sysreg(const struct arm64_cpu_capabilities *entry, int scope) 1623 { 1624 WARN_ON(scope == SCOPE_LOCAL_CPU && preemptible()); 1625 if (scope == SCOPE_SYSTEM) 1626 return read_sanitised_ftr_reg(entry->sys_reg); 1627 else 1628 return __read_sysreg_by_encoding(entry->sys_reg); 1629 } 1630 1631 static bool 1632 has_user_cpuid_feature(const struct arm64_cpu_capabilities *entry, int scope) 1633 { 1634 int mask; 1635 struct arm64_ftr_reg *regp; 1636 u64 val = read_scoped_sysreg(entry, scope); 1637 1638 regp = get_arm64_ftr_reg(entry->sys_reg); 1639 if (!regp) 1640 return false; 1641 1642 mask = cpuid_feature_extract_unsigned_field_width(regp->user_mask, 1643 entry->field_pos, 1644 entry->field_width); 1645 if (!mask) 1646 return false; 1647 1648 return feature_matches(val, entry); 1649 } 1650 1651 static bool 1652 has_cpuid_feature(const struct arm64_cpu_capabilities *entry, int scope) 1653 { 1654 u64 val = read_scoped_sysreg(entry, scope); 1655 return feature_matches(val, entry); 1656 } 1657 1658 const struct cpumask *system_32bit_el0_cpumask(void) 1659 { 1660 if (!system_supports_32bit_el0()) 1661 return cpu_none_mask; 1662 1663 if (static_branch_unlikely(&arm64_mismatched_32bit_el0)) 1664 return cpu_32bit_el0_mask; 1665 1666 return cpu_possible_mask; 1667 } 1668 1669 const struct cpumask *task_cpu_fallback_mask(struct task_struct *p) 1670 { 1671 return __task_cpu_possible_mask(p, housekeeping_cpumask(HK_TYPE_TICK)); 1672 } 1673 1674 static int __init parse_32bit_el0_param(char *str) 1675 { 1676 allow_mismatched_32bit_el0 = true; 1677 return 0; 1678 } 1679 early_param("allow_mismatched_32bit_el0", parse_32bit_el0_param); 1680 1681 static ssize_t aarch32_el0_show(struct device *dev, 1682 struct device_attribute *attr, char *buf) 1683 { 1684 const struct cpumask *mask = system_32bit_el0_cpumask(); 1685 1686 return sysfs_emit(buf, "%*pbl\n", cpumask_pr_args(mask)); 1687 } 1688 static const DEVICE_ATTR_RO(aarch32_el0); 1689 1690 static int __init aarch32_el0_sysfs_init(void) 1691 { 1692 struct device *dev_root; 1693 int ret = 0; 1694 1695 if (!allow_mismatched_32bit_el0) 1696 return 0; 1697 1698 dev_root = bus_get_dev_root(&cpu_subsys); 1699 if (dev_root) { 1700 ret = device_create_file(dev_root, &dev_attr_aarch32_el0); 1701 put_device(dev_root); 1702 } 1703 return ret; 1704 } 1705 device_initcall(aarch32_el0_sysfs_init); 1706 1707 static bool has_32bit_el0(const struct arm64_cpu_capabilities *entry, int scope) 1708 { 1709 if (!has_cpuid_feature(entry, scope)) 1710 return allow_mismatched_32bit_el0; 1711 1712 if (scope == SCOPE_SYSTEM) 1713 pr_info("detected: 32-bit EL0 Support\n"); 1714 1715 return true; 1716 } 1717 1718 static bool has_useable_gicv3_cpuif(const struct arm64_cpu_capabilities *entry, int scope) 1719 { 1720 bool has_sre; 1721 1722 if (!has_cpuid_feature(entry, scope)) 1723 return false; 1724 1725 has_sre = gic_enable_sre(); 1726 if (!has_sre) 1727 pr_warn_once("%s present but disabled by higher exception level\n", 1728 entry->desc); 1729 1730 return has_sre; 1731 } 1732 1733 static bool has_cache_idc(const struct arm64_cpu_capabilities *entry, 1734 int scope) 1735 { 1736 u64 ctr; 1737 1738 if (scope == SCOPE_SYSTEM) 1739 ctr = arm64_ftr_reg_ctrel0.sys_val; 1740 else 1741 ctr = read_cpuid_effective_cachetype(); 1742 1743 return ctr & BIT(CTR_EL0_IDC_SHIFT); 1744 } 1745 1746 static void cpu_emulate_effective_ctr(const struct arm64_cpu_capabilities *__unused) 1747 { 1748 /* 1749 * If the CPU exposes raw CTR_EL0.IDC = 0, while effectively 1750 * CTR_EL0.IDC = 1 (from CLIDR values), we need to trap accesses 1751 * to the CTR_EL0 on this CPU and emulate it with the real/safe 1752 * value. 1753 */ 1754 if (!(read_cpuid_cachetype() & BIT(CTR_EL0_IDC_SHIFT))) 1755 sysreg_clear_set(sctlr_el1, SCTLR_EL1_UCT, 0); 1756 } 1757 1758 static bool has_cache_dic(const struct arm64_cpu_capabilities *entry, 1759 int scope) 1760 { 1761 u64 ctr; 1762 1763 if (scope == SCOPE_SYSTEM) 1764 ctr = arm64_ftr_reg_ctrel0.sys_val; 1765 else 1766 ctr = read_cpuid_cachetype(); 1767 1768 return ctr & BIT(CTR_EL0_DIC_SHIFT); 1769 } 1770 1771 static bool __maybe_unused 1772 has_useable_cnp(const struct arm64_cpu_capabilities *entry, int scope) 1773 { 1774 /* 1775 * Kdump isn't guaranteed to power-off all secondary CPUs, CNP 1776 * may share TLB entries with a CPU stuck in the crashed 1777 * kernel. 1778 */ 1779 if (is_kdump_kernel()) 1780 return false; 1781 1782 if (cpus_have_cap(ARM64_WORKAROUND_NVIDIA_CARMEL_CNP)) 1783 return false; 1784 1785 return has_cpuid_feature(entry, scope); 1786 } 1787 1788 static bool __meltdown_safe = true; 1789 static int __kpti_forced; /* 0: not forced, >0: forced on, <0: forced off */ 1790 1791 static bool unmap_kernel_at_el0(const struct arm64_cpu_capabilities *entry, 1792 int scope) 1793 { 1794 /* List of CPUs that are not vulnerable and don't need KPTI */ 1795 static const struct midr_range kpti_safe_list[] = { 1796 MIDR_ALL_VERSIONS(MIDR_CAVIUM_THUNDERX2), 1797 MIDR_ALL_VERSIONS(MIDR_BRCM_VULCAN), 1798 MIDR_ALL_VERSIONS(MIDR_BRAHMA_B53), 1799 MIDR_ALL_VERSIONS(MIDR_CORTEX_A35), 1800 MIDR_ALL_VERSIONS(MIDR_CORTEX_A53), 1801 MIDR_ALL_VERSIONS(MIDR_CORTEX_A55), 1802 MIDR_ALL_VERSIONS(MIDR_CORTEX_A57), 1803 MIDR_ALL_VERSIONS(MIDR_CORTEX_A72), 1804 MIDR_ALL_VERSIONS(MIDR_CORTEX_A73), 1805 MIDR_ALL_VERSIONS(MIDR_HISI_TSV110), 1806 MIDR_ALL_VERSIONS(MIDR_NVIDIA_CARMEL), 1807 MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_2XX_GOLD), 1808 MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_2XX_SILVER), 1809 MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_3XX_SILVER), 1810 MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_4XX_SILVER), 1811 { /* sentinel */ } 1812 }; 1813 char const *str = "kpti command line option"; 1814 bool meltdown_safe; 1815 1816 meltdown_safe = is_midr_in_range_list(kpti_safe_list); 1817 1818 /* Defer to CPU feature registers */ 1819 if (has_cpuid_feature(entry, scope)) 1820 meltdown_safe = true; 1821 1822 if (!meltdown_safe) 1823 __meltdown_safe = false; 1824 1825 /* 1826 * For reasons that aren't entirely clear, enabling KPTI on Cavium 1827 * ThunderX leads to apparent I-cache corruption of kernel text, which 1828 * ends as well as you might imagine. Don't even try. We cannot rely 1829 * on the cpus_have_*cap() helpers here to detect the CPU erratum 1830 * because cpucap detection order may change. However, since we know 1831 * affected CPUs are always in a homogeneous configuration, it is 1832 * safe to rely on this_cpu_has_cap() here. 1833 */ 1834 if (this_cpu_has_cap(ARM64_WORKAROUND_CAVIUM_27456)) { 1835 str = "ARM64_WORKAROUND_CAVIUM_27456"; 1836 __kpti_forced = -1; 1837 } 1838 1839 /* Useful for KASLR robustness */ 1840 if (kaslr_enabled() && kaslr_requires_kpti()) { 1841 if (!__kpti_forced) { 1842 str = "KASLR"; 1843 __kpti_forced = 1; 1844 } 1845 } 1846 1847 if (cpu_mitigations_off() && !__kpti_forced) { 1848 str = "mitigations=off"; 1849 __kpti_forced = -1; 1850 } 1851 1852 if (!IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0)) { 1853 pr_info_once("kernel page table isolation disabled by kernel configuration\n"); 1854 return false; 1855 } 1856 1857 /* Forced? */ 1858 if (__kpti_forced) { 1859 pr_info_once("kernel page table isolation forced %s by %s\n", 1860 __kpti_forced > 0 ? "ON" : "OFF", str); 1861 return __kpti_forced > 0; 1862 } 1863 1864 return !meltdown_safe; 1865 } 1866 1867 static bool has_nv1(const struct arm64_cpu_capabilities *entry, int scope) 1868 { 1869 /* 1870 * Although the Apple M2 family appears to support NV1, the 1871 * PTW barfs on the nVHE EL2 S1 page table format. Pretend 1872 * that it doesn't support NV1 at all. 1873 */ 1874 static const struct midr_range nv1_ni_list[] = { 1875 MIDR_ALL_VERSIONS(MIDR_APPLE_M2_BLIZZARD), 1876 MIDR_ALL_VERSIONS(MIDR_APPLE_M2_AVALANCHE), 1877 MIDR_ALL_VERSIONS(MIDR_APPLE_M2_BLIZZARD_PRO), 1878 MIDR_ALL_VERSIONS(MIDR_APPLE_M2_AVALANCHE_PRO), 1879 MIDR_ALL_VERSIONS(MIDR_APPLE_M2_BLIZZARD_MAX), 1880 MIDR_ALL_VERSIONS(MIDR_APPLE_M2_AVALANCHE_MAX), 1881 {} 1882 }; 1883 1884 return (__system_matches_cap(ARM64_HAS_NESTED_VIRT) && 1885 !(has_cpuid_feature(entry, scope) || 1886 is_midr_in_range_list(nv1_ni_list))); 1887 } 1888 1889 #if defined(ID_AA64MMFR0_EL1_TGRAN_LPA2) && defined(ID_AA64MMFR0_EL1_TGRAN_2_SUPPORTED_LPA2) 1890 static bool has_lpa2_at_stage1(u64 mmfr0) 1891 { 1892 unsigned int tgran; 1893 1894 tgran = cpuid_feature_extract_unsigned_field(mmfr0, 1895 ID_AA64MMFR0_EL1_TGRAN_SHIFT); 1896 return tgran == ID_AA64MMFR0_EL1_TGRAN_LPA2; 1897 } 1898 1899 static bool has_lpa2_at_stage2(u64 mmfr0) 1900 { 1901 unsigned int tgran; 1902 1903 tgran = cpuid_feature_extract_unsigned_field(mmfr0, 1904 ID_AA64MMFR0_EL1_TGRAN_2_SHIFT); 1905 return tgran == ID_AA64MMFR0_EL1_TGRAN_2_SUPPORTED_LPA2; 1906 } 1907 1908 static bool has_lpa2(const struct arm64_cpu_capabilities *entry, int scope) 1909 { 1910 u64 mmfr0; 1911 1912 mmfr0 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1); 1913 return has_lpa2_at_stage1(mmfr0) && has_lpa2_at_stage2(mmfr0); 1914 } 1915 #else 1916 static bool has_lpa2(const struct arm64_cpu_capabilities *entry, int scope) 1917 { 1918 return false; 1919 } 1920 #endif 1921 1922 #ifdef CONFIG_HW_PERF_EVENTS 1923 static bool has_pmuv3(const struct arm64_cpu_capabilities *entry, int scope) 1924 { 1925 u64 dfr0 = read_sanitised_ftr_reg(SYS_ID_AA64DFR0_EL1); 1926 unsigned int pmuver; 1927 1928 /* 1929 * PMUVer follows the standard ID scheme for an unsigned field with the 1930 * exception of 0xF (IMP_DEF) which is treated specially and implies 1931 * FEAT_PMUv3 is not implemented. 1932 * 1933 * See DDI0487L.a D24.1.3.2 for more details. 1934 */ 1935 pmuver = cpuid_feature_extract_unsigned_field(dfr0, 1936 ID_AA64DFR0_EL1_PMUVer_SHIFT); 1937 if (pmuver == ID_AA64DFR0_EL1_PMUVer_IMP_DEF) 1938 return false; 1939 1940 return pmuver >= ID_AA64DFR0_EL1_PMUVer_IMP; 1941 } 1942 #endif 1943 1944 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 1945 #define KPTI_NG_TEMP_VA (-(1UL << PMD_SHIFT)) 1946 1947 extern 1948 void create_kpti_ng_temp_pgd(pgd_t *pgdir, phys_addr_t phys, unsigned long virt, 1949 phys_addr_t size, pgprot_t prot, 1950 phys_addr_t (*pgtable_alloc)(enum pgtable_type), int flags); 1951 1952 static phys_addr_t __initdata kpti_ng_temp_alloc; 1953 1954 static phys_addr_t __init kpti_ng_pgd_alloc(enum pgtable_type type) 1955 { 1956 kpti_ng_temp_alloc -= PAGE_SIZE; 1957 return kpti_ng_temp_alloc; 1958 } 1959 1960 static int __init __kpti_install_ng_mappings(void *__unused) 1961 { 1962 typedef void (kpti_remap_fn)(int, int, phys_addr_t, unsigned long); 1963 extern kpti_remap_fn idmap_kpti_install_ng_mappings; 1964 kpti_remap_fn *remap_fn; 1965 1966 int cpu = smp_processor_id(); 1967 int levels = CONFIG_PGTABLE_LEVELS; 1968 int order = order_base_2(levels); 1969 u64 kpti_ng_temp_pgd_pa = 0; 1970 pgd_t *kpti_ng_temp_pgd; 1971 u64 alloc = 0; 1972 1973 if (levels == 5 && !pgtable_l5_enabled()) 1974 levels = 4; 1975 else if (levels == 4 && !pgtable_l4_enabled()) 1976 levels = 3; 1977 1978 remap_fn = (void *)__pa_symbol(idmap_kpti_install_ng_mappings); 1979 1980 if (!cpu) { 1981 alloc = __get_free_pages(GFP_ATOMIC | __GFP_ZERO, order); 1982 kpti_ng_temp_pgd = (pgd_t *)(alloc + (levels - 1) * PAGE_SIZE); 1983 kpti_ng_temp_alloc = kpti_ng_temp_pgd_pa = __pa(kpti_ng_temp_pgd); 1984 1985 // 1986 // Create a minimal page table hierarchy that permits us to map 1987 // the swapper page tables temporarily as we traverse them. 1988 // 1989 // The physical pages are laid out as follows: 1990 // 1991 // +--------+-/-------+-/------ +-/------ +-\\\--------+ 1992 // : PTE[] : | PMD[] : | PUD[] : | P4D[] : ||| PGD[] : 1993 // +--------+-\-------+-\------ +-\------ +-///--------+ 1994 // ^ 1995 // The first page is mapped into this hierarchy at a PMD_SHIFT 1996 // aligned virtual address, so that we can manipulate the PTE 1997 // level entries while the mapping is active. The first entry 1998 // covers the PTE[] page itself, the remaining entries are free 1999 // to be used as a ad-hoc fixmap. 2000 // 2001 create_kpti_ng_temp_pgd(kpti_ng_temp_pgd, __pa(alloc), 2002 KPTI_NG_TEMP_VA, PAGE_SIZE, PAGE_KERNEL, 2003 kpti_ng_pgd_alloc, 0); 2004 } 2005 2006 cpu_install_idmap(); 2007 remap_fn(cpu, num_online_cpus(), kpti_ng_temp_pgd_pa, KPTI_NG_TEMP_VA); 2008 cpu_uninstall_idmap(); 2009 2010 if (!cpu) { 2011 free_pages(alloc, order); 2012 arm64_use_ng_mappings = true; 2013 } 2014 2015 return 0; 2016 } 2017 2018 static void __init kpti_install_ng_mappings(void) 2019 { 2020 /* Check whether KPTI is going to be used */ 2021 if (!arm64_kernel_unmapped_at_el0()) 2022 return; 2023 2024 /* 2025 * We don't need to rewrite the page-tables if either we've done 2026 * it already or we have KASLR enabled and therefore have not 2027 * created any global mappings at all. 2028 */ 2029 if (arm64_use_ng_mappings) 2030 return; 2031 2032 init_idmap_kpti_bbml2_flag(); 2033 stop_machine(__kpti_install_ng_mappings, NULL, cpu_online_mask); 2034 } 2035 2036 #else 2037 static inline void kpti_install_ng_mappings(void) 2038 { 2039 } 2040 #endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */ 2041 2042 static void cpu_enable_kpti(struct arm64_cpu_capabilities const *cap) 2043 { 2044 if (__this_cpu_read(this_cpu_vector) == vectors) { 2045 const char *v = arm64_get_bp_hardening_vector(EL1_VECTOR_KPTI); 2046 2047 __this_cpu_write(this_cpu_vector, v); 2048 } 2049 2050 } 2051 2052 static int __init parse_kpti(char *str) 2053 { 2054 bool enabled; 2055 int ret = kstrtobool(str, &enabled); 2056 2057 if (ret) 2058 return ret; 2059 2060 __kpti_forced = enabled ? 1 : -1; 2061 return 0; 2062 } 2063 early_param("kpti", parse_kpti); 2064 2065 #ifdef CONFIG_ARM64_HW_AFDBM 2066 static struct cpumask dbm_cpus __read_mostly; 2067 2068 static inline void __cpu_enable_hw_dbm(void) 2069 { 2070 u64 tcr = read_sysreg(tcr_el1) | TCR_HD; 2071 2072 write_sysreg(tcr, tcr_el1); 2073 isb(); 2074 local_flush_tlb_all(); 2075 } 2076 2077 static bool cpu_has_broken_dbm(void) 2078 { 2079 /* List of CPUs which have broken DBM support. */ 2080 static const struct midr_range cpus[] = { 2081 #ifdef CONFIG_ARM64_ERRATUM_1024718 2082 MIDR_ALL_VERSIONS(MIDR_CORTEX_A55), 2083 /* Kryo4xx Silver (rdpe => r1p0) */ 2084 MIDR_REV(MIDR_QCOM_KRYO_4XX_SILVER, 0xd, 0xe), 2085 #endif 2086 #ifdef CONFIG_ARM64_ERRATUM_2051678 2087 MIDR_REV_RANGE(MIDR_CORTEX_A510, 0, 0, 2), 2088 #endif 2089 {}, 2090 }; 2091 2092 return is_midr_in_range_list(cpus); 2093 } 2094 2095 static bool cpu_can_use_dbm(const struct arm64_cpu_capabilities *cap) 2096 { 2097 return has_cpuid_feature(cap, SCOPE_LOCAL_CPU) && 2098 !cpu_has_broken_dbm(); 2099 } 2100 2101 static void cpu_enable_hw_dbm(struct arm64_cpu_capabilities const *cap) 2102 { 2103 if (cpu_can_use_dbm(cap)) { 2104 __cpu_enable_hw_dbm(); 2105 cpumask_set_cpu(smp_processor_id(), &dbm_cpus); 2106 } 2107 } 2108 2109 static bool has_hw_dbm(const struct arm64_cpu_capabilities *cap, 2110 int __unused) 2111 { 2112 /* 2113 * DBM is a non-conflicting feature. i.e, the kernel can safely 2114 * run a mix of CPUs with and without the feature. So, we 2115 * unconditionally enable the capability to allow any late CPU 2116 * to use the feature. We only enable the control bits on the 2117 * CPU, if it is supported. 2118 */ 2119 2120 return true; 2121 } 2122 2123 #endif 2124 2125 #ifdef CONFIG_ARM64_AMU_EXTN 2126 2127 /* 2128 * The "amu_cpus" cpumask only signals that the CPU implementation for the 2129 * flagged CPUs supports the Activity Monitors Unit (AMU) but does not provide 2130 * information regarding all the events that it supports. When a CPU bit is 2131 * set in the cpumask, the user of this feature can only rely on the presence 2132 * of the 4 fixed counters for that CPU. But this does not guarantee that the 2133 * counters are enabled or access to these counters is enabled by code 2134 * executed at higher exception levels (firmware). 2135 */ 2136 static struct cpumask amu_cpus __read_mostly; 2137 2138 bool cpu_has_amu_feat(int cpu) 2139 { 2140 return cpumask_test_cpu(cpu, &amu_cpus); 2141 } 2142 2143 int get_cpu_with_amu_feat(void) 2144 { 2145 return cpumask_any(&amu_cpus); 2146 } 2147 2148 static void cpu_amu_enable(struct arm64_cpu_capabilities const *cap) 2149 { 2150 if (has_cpuid_feature(cap, SCOPE_LOCAL_CPU)) { 2151 cpumask_set_cpu(smp_processor_id(), &amu_cpus); 2152 2153 /* 0 reference values signal broken/disabled counters */ 2154 if (!this_cpu_has_cap(ARM64_WORKAROUND_2457168)) 2155 update_freq_counters_refs(); 2156 } 2157 } 2158 2159 static bool has_amu(const struct arm64_cpu_capabilities *cap, 2160 int __unused) 2161 { 2162 /* 2163 * The AMU extension is a non-conflicting feature: the kernel can 2164 * safely run a mix of CPUs with and without support for the 2165 * activity monitors extension. Therefore, unconditionally enable 2166 * the capability to allow any late CPU to use the feature. 2167 * 2168 * With this feature unconditionally enabled, the cpu_enable 2169 * function will be called for all CPUs that match the criteria, 2170 * including secondary and hotplugged, marking this feature as 2171 * present on that respective CPU. The enable function will also 2172 * print a detection message. 2173 */ 2174 2175 return true; 2176 } 2177 #else 2178 int get_cpu_with_amu_feat(void) 2179 { 2180 return nr_cpu_ids; 2181 } 2182 #endif 2183 2184 static bool runs_at_el2(const struct arm64_cpu_capabilities *entry, int __unused) 2185 { 2186 return is_kernel_in_hyp_mode(); 2187 } 2188 2189 static void cpu_copy_el2regs(const struct arm64_cpu_capabilities *__unused) 2190 { 2191 /* 2192 * Copy register values that aren't redirected by hardware. 2193 * 2194 * Before code patching, we only set tpidr_el1, all CPUs need to copy 2195 * this value to tpidr_el2 before we patch the code. Once we've done 2196 * that, freshly-onlined CPUs will set tpidr_el2, so we don't need to 2197 * do anything here. 2198 */ 2199 if (!alternative_is_applied(ARM64_HAS_VIRT_HOST_EXTN)) 2200 write_sysreg(read_sysreg(tpidr_el1), tpidr_el2); 2201 } 2202 2203 static bool has_nested_virt_support(const struct arm64_cpu_capabilities *cap, 2204 int scope) 2205 { 2206 if (kvm_get_mode() != KVM_MODE_NV) 2207 return false; 2208 2209 if (!cpucap_multi_entry_cap_matches(cap, scope)) { 2210 pr_warn("unavailable: %s\n", cap->desc); 2211 return false; 2212 } 2213 2214 return true; 2215 } 2216 2217 static bool hvhe_possible(const struct arm64_cpu_capabilities *entry, 2218 int __unused) 2219 { 2220 return arm64_test_sw_feature_override(ARM64_SW_FEATURE_OVERRIDE_HVHE); 2221 } 2222 2223 bool cpu_supports_bbml2_noabort(void) 2224 { 2225 /* 2226 * We want to allow usage of BBML2 in as wide a range of kernel contexts 2227 * as possible. This list is therefore an allow-list of known-good 2228 * implementations that both support BBML2 and additionally, fulfill the 2229 * extra constraint of never generating TLB conflict aborts when using 2230 * the relaxed BBML2 semantics (such aborts make use of BBML2 in certain 2231 * kernel contexts difficult to prove safe against recursive aborts). 2232 * 2233 * Note that implementations can only be considered "known-good" if their 2234 * implementors attest to the fact that the implementation never raises 2235 * TLB conflict aborts for BBML2 mapping granularity changes. 2236 */ 2237 static const struct midr_range supports_bbml2_noabort_list[] = { 2238 MIDR_REV_RANGE(MIDR_CORTEX_X4, 0, 3, 0xf), 2239 MIDR_REV_RANGE(MIDR_NEOVERSE_V3, 0, 2, 0xf), 2240 MIDR_REV_RANGE(MIDR_NEOVERSE_V3AE, 0, 2, 0xf), 2241 MIDR_ALL_VERSIONS(MIDR_NVIDIA_OLYMPUS), 2242 MIDR_ALL_VERSIONS(MIDR_AMPERE1), 2243 MIDR_ALL_VERSIONS(MIDR_AMPERE1A), 2244 {} 2245 }; 2246 2247 /* Does our cpu guarantee to never raise TLB conflict aborts? */ 2248 if (!is_midr_in_range_list(supports_bbml2_noabort_list)) 2249 return false; 2250 2251 /* 2252 * We currently ignore the ID_AA64MMFR2_EL1 register, and only care 2253 * about whether the MIDR check passes. 2254 */ 2255 2256 return true; 2257 } 2258 2259 static bool has_bbml2_noabort(const struct arm64_cpu_capabilities *caps, int scope) 2260 { 2261 return cpu_supports_bbml2_noabort(); 2262 } 2263 2264 #ifdef CONFIG_ARM64_PAN 2265 static void cpu_enable_pan(const struct arm64_cpu_capabilities *__unused) 2266 { 2267 /* 2268 * We modify PSTATE. This won't work from irq context as the PSTATE 2269 * is discarded once we return from the exception. 2270 */ 2271 WARN_ON_ONCE(in_interrupt()); 2272 2273 sysreg_clear_set(sctlr_el1, SCTLR_EL1_SPAN, 0); 2274 set_pstate_pan(1); 2275 } 2276 #endif /* CONFIG_ARM64_PAN */ 2277 2278 #ifdef CONFIG_ARM64_RAS_EXTN 2279 static void cpu_clear_disr(const struct arm64_cpu_capabilities *__unused) 2280 { 2281 /* Firmware may have left a deferred SError in this register. */ 2282 write_sysreg_s(0, SYS_DISR_EL1); 2283 } 2284 static bool has_rasv1p1(const struct arm64_cpu_capabilities *__unused, int scope) 2285 { 2286 const struct arm64_cpu_capabilities rasv1p1_caps[] = { 2287 { 2288 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, RAS, V1P1) 2289 }, 2290 { 2291 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, RAS, IMP) 2292 }, 2293 { 2294 ARM64_CPUID_FIELDS(ID_AA64PFR1_EL1, RAS_frac, RASv1p1) 2295 }, 2296 }; 2297 2298 return (has_cpuid_feature(&rasv1p1_caps[0], scope) || 2299 (has_cpuid_feature(&rasv1p1_caps[1], scope) && 2300 has_cpuid_feature(&rasv1p1_caps[2], scope))); 2301 } 2302 #endif /* CONFIG_ARM64_RAS_EXTN */ 2303 2304 #ifdef CONFIG_ARM64_PTR_AUTH 2305 static bool has_address_auth_cpucap(const struct arm64_cpu_capabilities *entry, int scope) 2306 { 2307 int boot_val, sec_val; 2308 2309 /* We don't expect to be called with SCOPE_SYSTEM */ 2310 WARN_ON(scope == SCOPE_SYSTEM); 2311 /* 2312 * The ptr-auth feature levels are not intercompatible with lower 2313 * levels. Hence we must match ptr-auth feature level of the secondary 2314 * CPUs with that of the boot CPU. The level of boot cpu is fetched 2315 * from the sanitised register whereas direct register read is done for 2316 * the secondary CPUs. 2317 * The sanitised feature state is guaranteed to match that of the 2318 * boot CPU as a mismatched secondary CPU is parked before it gets 2319 * a chance to update the state, with the capability. 2320 */ 2321 boot_val = cpuid_feature_extract_field(read_sanitised_ftr_reg(entry->sys_reg), 2322 entry->field_pos, entry->sign); 2323 if (scope & SCOPE_BOOT_CPU) 2324 return boot_val >= entry->min_field_value; 2325 /* Now check for the secondary CPUs with SCOPE_LOCAL_CPU scope */ 2326 sec_val = cpuid_feature_extract_field(__read_sysreg_by_encoding(entry->sys_reg), 2327 entry->field_pos, entry->sign); 2328 return (sec_val >= entry->min_field_value) && (sec_val == boot_val); 2329 } 2330 2331 static bool has_address_auth_metacap(const struct arm64_cpu_capabilities *entry, 2332 int scope) 2333 { 2334 bool api = has_address_auth_cpucap(cpucap_ptrs[ARM64_HAS_ADDRESS_AUTH_IMP_DEF], scope); 2335 bool apa = has_address_auth_cpucap(cpucap_ptrs[ARM64_HAS_ADDRESS_AUTH_ARCH_QARMA5], scope); 2336 bool apa3 = has_address_auth_cpucap(cpucap_ptrs[ARM64_HAS_ADDRESS_AUTH_ARCH_QARMA3], scope); 2337 2338 return apa || apa3 || api; 2339 } 2340 2341 static bool has_generic_auth(const struct arm64_cpu_capabilities *entry, 2342 int __unused) 2343 { 2344 bool gpi = __system_matches_cap(ARM64_HAS_GENERIC_AUTH_IMP_DEF); 2345 bool gpa = __system_matches_cap(ARM64_HAS_GENERIC_AUTH_ARCH_QARMA5); 2346 bool gpa3 = __system_matches_cap(ARM64_HAS_GENERIC_AUTH_ARCH_QARMA3); 2347 2348 return gpa || gpa3 || gpi; 2349 } 2350 #endif /* CONFIG_ARM64_PTR_AUTH */ 2351 2352 #ifdef CONFIG_ARM64_E0PD 2353 static void cpu_enable_e0pd(struct arm64_cpu_capabilities const *cap) 2354 { 2355 if (this_cpu_has_cap(ARM64_HAS_E0PD)) 2356 sysreg_clear_set(tcr_el1, 0, TCR_E0PD1); 2357 } 2358 #endif /* CONFIG_ARM64_E0PD */ 2359 2360 #ifdef CONFIG_ARM64_PSEUDO_NMI 2361 static bool can_use_gic_priorities(const struct arm64_cpu_capabilities *entry, 2362 int scope) 2363 { 2364 /* 2365 * ARM64_HAS_GICV3_CPUIF has a lower index, and is a boot CPU 2366 * feature, so will be detected earlier. 2367 */ 2368 BUILD_BUG_ON(ARM64_HAS_GIC_PRIO_MASKING <= ARM64_HAS_GICV3_CPUIF); 2369 if (!cpus_have_cap(ARM64_HAS_GICV3_CPUIF)) 2370 return false; 2371 2372 return enable_pseudo_nmi; 2373 } 2374 2375 static bool has_gic_prio_relaxed_sync(const struct arm64_cpu_capabilities *entry, 2376 int scope) 2377 { 2378 /* 2379 * If we're not using priority masking then we won't be poking PMR_EL1, 2380 * and there's no need to relax synchronization of writes to it, and 2381 * ICC_CTLR_EL1 might not be accessible and we must avoid reads from 2382 * that. 2383 * 2384 * ARM64_HAS_GIC_PRIO_MASKING has a lower index, and is a boot CPU 2385 * feature, so will be detected earlier. 2386 */ 2387 BUILD_BUG_ON(ARM64_HAS_GIC_PRIO_RELAXED_SYNC <= ARM64_HAS_GIC_PRIO_MASKING); 2388 if (!cpus_have_cap(ARM64_HAS_GIC_PRIO_MASKING)) 2389 return false; 2390 2391 /* 2392 * When Priority Mask Hint Enable (PMHE) == 0b0, PMR is not used as a 2393 * hint for interrupt distribution, a DSB is not necessary when 2394 * unmasking IRQs via PMR, and we can relax the barrier to a NOP. 2395 * 2396 * Linux itself doesn't use 1:N distribution, so has no need to 2397 * set PMHE. The only reason to have it set is if EL3 requires it 2398 * (and we can't change it). 2399 */ 2400 return (gic_read_ctlr() & ICC_CTLR_EL1_PMHE_MASK) == 0; 2401 } 2402 #endif 2403 2404 #ifdef CONFIG_ARM64_BTI 2405 static void bti_enable(const struct arm64_cpu_capabilities *__unused) 2406 { 2407 /* 2408 * Use of X16/X17 for tail-calls and trampolines that jump to 2409 * function entry points using BR is a requirement for 2410 * marking binaries with GNU_PROPERTY_AARCH64_FEATURE_1_BTI. 2411 * So, be strict and forbid other BRs using other registers to 2412 * jump onto a PACIxSP instruction: 2413 */ 2414 sysreg_clear_set(sctlr_el1, 0, SCTLR_EL1_BT0 | SCTLR_EL1_BT1); 2415 isb(); 2416 } 2417 #endif /* CONFIG_ARM64_BTI */ 2418 2419 #ifdef CONFIG_ARM64_MTE 2420 static void cpu_enable_mte(struct arm64_cpu_capabilities const *cap) 2421 { 2422 sysreg_clear_set(sctlr_el1, 0, SCTLR_ELx_ATA | SCTLR_EL1_ATA0); 2423 2424 mte_cpu_setup(); 2425 2426 /* 2427 * Clear the tags in the zero page. This needs to be done via the 2428 * linear map which has the Tagged attribute. 2429 */ 2430 if (try_page_mte_tagging(ZERO_PAGE(0))) { 2431 mte_clear_page_tags(lm_alias(empty_zero_page)); 2432 set_page_mte_tagged(ZERO_PAGE(0)); 2433 } 2434 2435 kasan_init_hw_tags_cpu(); 2436 } 2437 #endif /* CONFIG_ARM64_MTE */ 2438 2439 static void user_feature_fixup(void) 2440 { 2441 if (cpus_have_cap(ARM64_WORKAROUND_2658417)) { 2442 struct arm64_ftr_reg *regp; 2443 2444 regp = get_arm64_ftr_reg(SYS_ID_AA64ISAR1_EL1); 2445 if (regp) 2446 regp->user_mask &= ~ID_AA64ISAR1_EL1_BF16_MASK; 2447 } 2448 2449 if (cpus_have_cap(ARM64_WORKAROUND_SPECULATIVE_SSBS)) { 2450 struct arm64_ftr_reg *regp; 2451 2452 regp = get_arm64_ftr_reg(SYS_ID_AA64PFR1_EL1); 2453 if (regp) 2454 regp->user_mask &= ~ID_AA64PFR1_EL1_SSBS_MASK; 2455 } 2456 } 2457 2458 static void elf_hwcap_fixup(void) 2459 { 2460 #ifdef CONFIG_COMPAT 2461 if (cpus_have_cap(ARM64_WORKAROUND_1742098)) 2462 compat_elf_hwcap2 &= ~COMPAT_HWCAP2_AES; 2463 #endif /* CONFIG_COMPAT */ 2464 } 2465 2466 #ifdef CONFIG_KVM 2467 static bool is_kvm_protected_mode(const struct arm64_cpu_capabilities *entry, int __unused) 2468 { 2469 return kvm_get_mode() == KVM_MODE_PROTECTED; 2470 } 2471 #endif /* CONFIG_KVM */ 2472 2473 static void cpu_trap_el0_impdef(const struct arm64_cpu_capabilities *__unused) 2474 { 2475 sysreg_clear_set(sctlr_el1, 0, SCTLR_EL1_TIDCP); 2476 } 2477 2478 static void cpu_enable_dit(const struct arm64_cpu_capabilities *__unused) 2479 { 2480 set_pstate_dit(1); 2481 } 2482 2483 static void cpu_enable_mops(const struct arm64_cpu_capabilities *__unused) 2484 { 2485 sysreg_clear_set(sctlr_el1, 0, SCTLR_EL1_MSCEn); 2486 } 2487 2488 #ifdef CONFIG_ARM64_POE 2489 static void cpu_enable_poe(const struct arm64_cpu_capabilities *__unused) 2490 { 2491 sysreg_clear_set(REG_TCR2_EL1, 0, TCR2_EL1_E0POE); 2492 sysreg_clear_set(CPACR_EL1, 0, CPACR_EL1_E0POE); 2493 } 2494 #endif 2495 2496 #ifdef CONFIG_ARM64_GCS 2497 static void cpu_enable_gcs(const struct arm64_cpu_capabilities *__unused) 2498 { 2499 /* GCSPR_EL0 is always readable */ 2500 write_sysreg_s(GCSCRE0_EL1_nTR, SYS_GCSCRE0_EL1); 2501 } 2502 #endif 2503 2504 /* Internal helper functions to match cpu capability type */ 2505 static bool 2506 cpucap_late_cpu_optional(const struct arm64_cpu_capabilities *cap) 2507 { 2508 return !!(cap->type & ARM64_CPUCAP_OPTIONAL_FOR_LATE_CPU); 2509 } 2510 2511 static bool 2512 cpucap_late_cpu_permitted(const struct arm64_cpu_capabilities *cap) 2513 { 2514 return !!(cap->type & ARM64_CPUCAP_PERMITTED_FOR_LATE_CPU); 2515 } 2516 2517 static bool 2518 cpucap_panic_on_conflict(const struct arm64_cpu_capabilities *cap) 2519 { 2520 return !!(cap->type & ARM64_CPUCAP_PANIC_ON_CONFLICT); 2521 } 2522 2523 static bool 2524 test_has_mpam(const struct arm64_cpu_capabilities *entry, int scope) 2525 { 2526 if (!has_cpuid_feature(entry, scope)) 2527 return false; 2528 2529 /* Check firmware actually enabled MPAM on this cpu. */ 2530 return (read_sysreg_s(SYS_MPAM1_EL1) & MPAM1_EL1_MPAMEN); 2531 } 2532 2533 static void 2534 cpu_enable_mpam(const struct arm64_cpu_capabilities *entry) 2535 { 2536 /* 2537 * Access by the kernel (at EL1) should use the reserved PARTID 2538 * which is configured unrestricted. This avoids priority-inversion 2539 * where latency sensitive tasks have to wait for a task that has 2540 * been throttled to release the lock. 2541 */ 2542 write_sysreg_s(0, SYS_MPAM1_EL1); 2543 } 2544 2545 static bool 2546 test_has_mpam_hcr(const struct arm64_cpu_capabilities *entry, int scope) 2547 { 2548 u64 idr = read_sanitised_ftr_reg(SYS_MPAMIDR_EL1); 2549 2550 return idr & MPAMIDR_EL1_HAS_HCR; 2551 } 2552 2553 static const struct arm64_cpu_capabilities arm64_features[] = { 2554 { 2555 .capability = ARM64_ALWAYS_BOOT, 2556 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 2557 .matches = has_always, 2558 }, 2559 { 2560 .capability = ARM64_ALWAYS_SYSTEM, 2561 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2562 .matches = has_always, 2563 }, 2564 { 2565 .desc = "GICv3 CPU interface", 2566 .capability = ARM64_HAS_GICV3_CPUIF, 2567 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, 2568 .matches = has_useable_gicv3_cpuif, 2569 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, GIC, IMP) 2570 }, 2571 { 2572 .desc = "Enhanced Counter Virtualization", 2573 .capability = ARM64_HAS_ECV, 2574 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2575 .matches = has_cpuid_feature, 2576 ARM64_CPUID_FIELDS(ID_AA64MMFR0_EL1, ECV, IMP) 2577 }, 2578 { 2579 .desc = "Enhanced Counter Virtualization (CNTPOFF)", 2580 .capability = ARM64_HAS_ECV_CNTPOFF, 2581 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2582 .matches = has_cpuid_feature, 2583 ARM64_CPUID_FIELDS(ID_AA64MMFR0_EL1, ECV, CNTPOFF) 2584 }, 2585 #ifdef CONFIG_ARM64_PAN 2586 { 2587 .desc = "Privileged Access Never", 2588 .capability = ARM64_HAS_PAN, 2589 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2590 .matches = has_cpuid_feature, 2591 .cpu_enable = cpu_enable_pan, 2592 ARM64_CPUID_FIELDS(ID_AA64MMFR1_EL1, PAN, IMP) 2593 }, 2594 #endif /* CONFIG_ARM64_PAN */ 2595 #ifdef CONFIG_ARM64_EPAN 2596 { 2597 .desc = "Enhanced Privileged Access Never", 2598 .capability = ARM64_HAS_EPAN, 2599 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2600 .matches = has_cpuid_feature, 2601 ARM64_CPUID_FIELDS(ID_AA64MMFR1_EL1, PAN, PAN3) 2602 }, 2603 #endif /* CONFIG_ARM64_EPAN */ 2604 #ifdef CONFIG_ARM64_LSE_ATOMICS 2605 { 2606 .desc = "LSE atomic instructions", 2607 .capability = ARM64_HAS_LSE_ATOMICS, 2608 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2609 .matches = has_cpuid_feature, 2610 ARM64_CPUID_FIELDS(ID_AA64ISAR0_EL1, ATOMIC, IMP) 2611 }, 2612 #endif /* CONFIG_ARM64_LSE_ATOMICS */ 2613 { 2614 .desc = "Virtualization Host Extensions", 2615 .capability = ARM64_HAS_VIRT_HOST_EXTN, 2616 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, 2617 .matches = runs_at_el2, 2618 .cpu_enable = cpu_copy_el2regs, 2619 }, 2620 { 2621 .desc = "Nested Virtualization Support", 2622 .capability = ARM64_HAS_NESTED_VIRT, 2623 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2624 .matches = has_nested_virt_support, 2625 .match_list = (const struct arm64_cpu_capabilities []){ 2626 { 2627 .matches = has_cpuid_feature, 2628 ARM64_CPUID_FIELDS(ID_AA64MMFR2_EL1, NV, NV2) 2629 }, 2630 { 2631 .matches = has_cpuid_feature, 2632 ARM64_CPUID_FIELDS(ID_AA64MMFR4_EL1, NV_frac, NV2_ONLY) 2633 }, 2634 { /* Sentinel */ } 2635 }, 2636 }, 2637 { 2638 .capability = ARM64_HAS_32BIT_EL0_DO_NOT_USE, 2639 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2640 .matches = has_32bit_el0, 2641 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, EL0, AARCH32) 2642 }, 2643 #ifdef CONFIG_KVM 2644 { 2645 .desc = "32-bit EL1 Support", 2646 .capability = ARM64_HAS_32BIT_EL1, 2647 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2648 .matches = has_cpuid_feature, 2649 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, EL1, AARCH32) 2650 }, 2651 { 2652 .desc = "Protected KVM", 2653 .capability = ARM64_KVM_PROTECTED_MODE, 2654 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2655 .matches = is_kvm_protected_mode, 2656 }, 2657 { 2658 .desc = "HCRX_EL2 register", 2659 .capability = ARM64_HAS_HCX, 2660 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, 2661 .matches = has_cpuid_feature, 2662 ARM64_CPUID_FIELDS(ID_AA64MMFR1_EL1, HCX, IMP) 2663 }, 2664 #endif 2665 { 2666 .desc = "Kernel page table isolation (KPTI)", 2667 .capability = ARM64_UNMAP_KERNEL_AT_EL0, 2668 .type = ARM64_CPUCAP_BOOT_RESTRICTED_CPU_LOCAL_FEATURE, 2669 .cpu_enable = cpu_enable_kpti, 2670 .matches = unmap_kernel_at_el0, 2671 /* 2672 * The ID feature fields below are used to indicate that 2673 * the CPU doesn't need KPTI. See unmap_kernel_at_el0 for 2674 * more details. 2675 */ 2676 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, CSV3, IMP) 2677 }, 2678 { 2679 .capability = ARM64_HAS_FPSIMD, 2680 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2681 .matches = has_cpuid_feature, 2682 .cpu_enable = cpu_enable_fpsimd, 2683 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, FP, IMP) 2684 }, 2685 #ifdef CONFIG_ARM64_PMEM 2686 { 2687 .desc = "Data cache clean to Point of Persistence", 2688 .capability = ARM64_HAS_DCPOP, 2689 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2690 .matches = has_cpuid_feature, 2691 ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, DPB, IMP) 2692 }, 2693 { 2694 .desc = "Data cache clean to Point of Deep Persistence", 2695 .capability = ARM64_HAS_DCPODP, 2696 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2697 .matches = has_cpuid_feature, 2698 ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, DPB, DPB2) 2699 }, 2700 #endif 2701 #ifdef CONFIG_ARM64_SVE 2702 { 2703 .desc = "Scalable Vector Extension", 2704 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2705 .capability = ARM64_SVE, 2706 .cpu_enable = cpu_enable_sve, 2707 .matches = has_cpuid_feature, 2708 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, SVE, IMP) 2709 }, 2710 #endif /* CONFIG_ARM64_SVE */ 2711 #ifdef CONFIG_ARM64_RAS_EXTN 2712 { 2713 .desc = "RAS Extension Support", 2714 .capability = ARM64_HAS_RAS_EXTN, 2715 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2716 .matches = has_cpuid_feature, 2717 .cpu_enable = cpu_clear_disr, 2718 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, RAS, IMP) 2719 }, 2720 { 2721 .desc = "RASv1p1 Extension Support", 2722 .capability = ARM64_HAS_RASV1P1_EXTN, 2723 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2724 .matches = has_rasv1p1, 2725 }, 2726 #endif /* CONFIG_ARM64_RAS_EXTN */ 2727 #ifdef CONFIG_ARM64_AMU_EXTN 2728 { 2729 .desc = "Activity Monitors Unit (AMU)", 2730 .capability = ARM64_HAS_AMU_EXTN, 2731 .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE, 2732 .matches = has_amu, 2733 .cpu_enable = cpu_amu_enable, 2734 .cpus = &amu_cpus, 2735 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, AMU, IMP) 2736 }, 2737 #endif /* CONFIG_ARM64_AMU_EXTN */ 2738 { 2739 .desc = "Data cache clean to the PoU not required for I/D coherence", 2740 .capability = ARM64_HAS_CACHE_IDC, 2741 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2742 .matches = has_cache_idc, 2743 .cpu_enable = cpu_emulate_effective_ctr, 2744 }, 2745 { 2746 .desc = "Instruction cache invalidation not required for I/D coherence", 2747 .capability = ARM64_HAS_CACHE_DIC, 2748 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2749 .matches = has_cache_dic, 2750 }, 2751 { 2752 .desc = "Stage-2 Force Write-Back", 2753 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2754 .capability = ARM64_HAS_STAGE2_FWB, 2755 .matches = has_cpuid_feature, 2756 ARM64_CPUID_FIELDS(ID_AA64MMFR2_EL1, FWB, IMP) 2757 }, 2758 { 2759 .desc = "ARMv8.4 Translation Table Level", 2760 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2761 .capability = ARM64_HAS_ARMv8_4_TTL, 2762 .matches = has_cpuid_feature, 2763 ARM64_CPUID_FIELDS(ID_AA64MMFR2_EL1, TTL, IMP) 2764 }, 2765 { 2766 .desc = "TLB range maintenance instructions", 2767 .capability = ARM64_HAS_TLB_RANGE, 2768 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2769 .matches = has_cpuid_feature, 2770 ARM64_CPUID_FIELDS(ID_AA64ISAR0_EL1, TLB, RANGE) 2771 }, 2772 #ifdef CONFIG_ARM64_HW_AFDBM 2773 { 2774 .desc = "Hardware dirty bit management", 2775 .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE, 2776 .capability = ARM64_HW_DBM, 2777 .matches = has_hw_dbm, 2778 .cpu_enable = cpu_enable_hw_dbm, 2779 .cpus = &dbm_cpus, 2780 ARM64_CPUID_FIELDS(ID_AA64MMFR1_EL1, HAFDBS, DBM) 2781 }, 2782 #endif 2783 #ifdef CONFIG_ARM64_HAFT 2784 { 2785 .desc = "Hardware managed Access Flag for Table Descriptors", 2786 /* 2787 * Contrary to the page/block access flag, the table access flag 2788 * cannot be emulated in software (no access fault will occur). 2789 * Therefore this should be used only if it's supported system 2790 * wide. 2791 */ 2792 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2793 .capability = ARM64_HAFT, 2794 .matches = has_cpuid_feature, 2795 ARM64_CPUID_FIELDS(ID_AA64MMFR1_EL1, HAFDBS, HAFT) 2796 }, 2797 #endif 2798 { 2799 .desc = "CRC32 instructions", 2800 .capability = ARM64_HAS_CRC32, 2801 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2802 .matches = has_cpuid_feature, 2803 ARM64_CPUID_FIELDS(ID_AA64ISAR0_EL1, CRC32, IMP) 2804 }, 2805 { 2806 .desc = "Speculative Store Bypassing Safe (SSBS)", 2807 .capability = ARM64_SSBS, 2808 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2809 .matches = has_cpuid_feature, 2810 ARM64_CPUID_FIELDS(ID_AA64PFR1_EL1, SSBS, IMP) 2811 }, 2812 #ifdef CONFIG_ARM64_CNP 2813 { 2814 .desc = "Common not Private translations", 2815 .capability = ARM64_HAS_CNP, 2816 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2817 .matches = has_useable_cnp, 2818 .cpu_enable = cpu_enable_cnp, 2819 ARM64_CPUID_FIELDS(ID_AA64MMFR2_EL1, CnP, IMP) 2820 }, 2821 #endif 2822 { 2823 .desc = "Speculation barrier (SB)", 2824 .capability = ARM64_HAS_SB, 2825 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2826 .matches = has_cpuid_feature, 2827 ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, SB, IMP) 2828 }, 2829 #ifdef CONFIG_ARM64_PTR_AUTH 2830 { 2831 .desc = "Address authentication (architected QARMA5 algorithm)", 2832 .capability = ARM64_HAS_ADDRESS_AUTH_ARCH_QARMA5, 2833 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 2834 .matches = has_address_auth_cpucap, 2835 ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, APA, PAuth) 2836 }, 2837 { 2838 .desc = "Address authentication (architected QARMA3 algorithm)", 2839 .capability = ARM64_HAS_ADDRESS_AUTH_ARCH_QARMA3, 2840 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 2841 .matches = has_address_auth_cpucap, 2842 ARM64_CPUID_FIELDS(ID_AA64ISAR2_EL1, APA3, PAuth) 2843 }, 2844 { 2845 .desc = "Address authentication (IMP DEF algorithm)", 2846 .capability = ARM64_HAS_ADDRESS_AUTH_IMP_DEF, 2847 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 2848 .matches = has_address_auth_cpucap, 2849 ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, API, PAuth) 2850 }, 2851 { 2852 .capability = ARM64_HAS_ADDRESS_AUTH, 2853 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 2854 .matches = has_address_auth_metacap, 2855 }, 2856 { 2857 .desc = "Generic authentication (architected QARMA5 algorithm)", 2858 .capability = ARM64_HAS_GENERIC_AUTH_ARCH_QARMA5, 2859 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2860 .matches = has_cpuid_feature, 2861 ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, GPA, IMP) 2862 }, 2863 { 2864 .desc = "Generic authentication (architected QARMA3 algorithm)", 2865 .capability = ARM64_HAS_GENERIC_AUTH_ARCH_QARMA3, 2866 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2867 .matches = has_cpuid_feature, 2868 ARM64_CPUID_FIELDS(ID_AA64ISAR2_EL1, GPA3, IMP) 2869 }, 2870 { 2871 .desc = "Generic authentication (IMP DEF algorithm)", 2872 .capability = ARM64_HAS_GENERIC_AUTH_IMP_DEF, 2873 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2874 .matches = has_cpuid_feature, 2875 ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, GPI, IMP) 2876 }, 2877 { 2878 .capability = ARM64_HAS_GENERIC_AUTH, 2879 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2880 .matches = has_generic_auth, 2881 }, 2882 #endif /* CONFIG_ARM64_PTR_AUTH */ 2883 #ifdef CONFIG_ARM64_PSEUDO_NMI 2884 { 2885 /* 2886 * Depends on having GICv3 2887 */ 2888 .desc = "IRQ priority masking", 2889 .capability = ARM64_HAS_GIC_PRIO_MASKING, 2890 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, 2891 .matches = can_use_gic_priorities, 2892 }, 2893 { 2894 /* 2895 * Depends on ARM64_HAS_GIC_PRIO_MASKING 2896 */ 2897 .capability = ARM64_HAS_GIC_PRIO_RELAXED_SYNC, 2898 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, 2899 .matches = has_gic_prio_relaxed_sync, 2900 }, 2901 #endif 2902 #ifdef CONFIG_ARM64_E0PD 2903 { 2904 .desc = "E0PD", 2905 .capability = ARM64_HAS_E0PD, 2906 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2907 .cpu_enable = cpu_enable_e0pd, 2908 .matches = has_cpuid_feature, 2909 ARM64_CPUID_FIELDS(ID_AA64MMFR2_EL1, E0PD, IMP) 2910 }, 2911 #endif 2912 { 2913 .desc = "Random Number Generator", 2914 .capability = ARM64_HAS_RNG, 2915 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2916 .matches = has_cpuid_feature, 2917 ARM64_CPUID_FIELDS(ID_AA64ISAR0_EL1, RNDR, IMP) 2918 }, 2919 #ifdef CONFIG_ARM64_BTI 2920 { 2921 .desc = "Branch Target Identification", 2922 .capability = ARM64_BTI, 2923 #ifdef CONFIG_ARM64_BTI_KERNEL 2924 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, 2925 #else 2926 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2927 #endif 2928 .matches = has_cpuid_feature, 2929 .cpu_enable = bti_enable, 2930 ARM64_CPUID_FIELDS(ID_AA64PFR1_EL1, BT, IMP) 2931 }, 2932 #endif 2933 #ifdef CONFIG_ARM64_MTE 2934 { 2935 .desc = "Memory Tagging Extension", 2936 .capability = ARM64_MTE, 2937 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, 2938 .matches = has_cpuid_feature, 2939 .cpu_enable = cpu_enable_mte, 2940 ARM64_CPUID_FIELDS(ID_AA64PFR1_EL1, MTE, MTE2) 2941 }, 2942 { 2943 .desc = "Asymmetric MTE Tag Check Fault", 2944 .capability = ARM64_MTE_ASYMM, 2945 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 2946 .matches = has_cpuid_feature, 2947 ARM64_CPUID_FIELDS(ID_AA64PFR1_EL1, MTE, MTE3) 2948 }, 2949 { 2950 .desc = "FAR on MTE Tag Check Fault", 2951 .capability = ARM64_MTE_FAR, 2952 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2953 .matches = has_cpuid_feature, 2954 ARM64_CPUID_FIELDS(ID_AA64PFR2_EL1, MTEFAR, IMP) 2955 }, 2956 { 2957 .desc = "Store Only MTE Tag Check", 2958 .capability = ARM64_MTE_STORE_ONLY, 2959 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2960 .matches = has_cpuid_feature, 2961 ARM64_CPUID_FIELDS(ID_AA64PFR2_EL1, MTESTOREONLY, IMP) 2962 }, 2963 #endif /* CONFIG_ARM64_MTE */ 2964 { 2965 .desc = "RCpc load-acquire (LDAPR)", 2966 .capability = ARM64_HAS_LDAPR, 2967 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2968 .matches = has_cpuid_feature, 2969 ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, LRCPC, IMP) 2970 }, 2971 { 2972 .desc = "Fine Grained Traps", 2973 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2974 .capability = ARM64_HAS_FGT, 2975 .matches = has_cpuid_feature, 2976 ARM64_CPUID_FIELDS(ID_AA64MMFR0_EL1, FGT, IMP) 2977 }, 2978 { 2979 .desc = "Fine Grained Traps 2", 2980 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2981 .capability = ARM64_HAS_FGT2, 2982 .matches = has_cpuid_feature, 2983 ARM64_CPUID_FIELDS(ID_AA64MMFR0_EL1, FGT, FGT2) 2984 }, 2985 #ifdef CONFIG_ARM64_SME 2986 { 2987 .desc = "Scalable Matrix Extension", 2988 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2989 .capability = ARM64_SME, 2990 .matches = has_cpuid_feature, 2991 .cpu_enable = cpu_enable_sme, 2992 ARM64_CPUID_FIELDS(ID_AA64PFR1_EL1, SME, IMP) 2993 }, 2994 /* FA64 should be sorted after the base SME capability */ 2995 { 2996 .desc = "FA64", 2997 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2998 .capability = ARM64_SME_FA64, 2999 .matches = has_cpuid_feature, 3000 .cpu_enable = cpu_enable_fa64, 3001 ARM64_CPUID_FIELDS(ID_AA64SMFR0_EL1, FA64, IMP) 3002 }, 3003 { 3004 .desc = "SME2", 3005 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3006 .capability = ARM64_SME2, 3007 .matches = has_cpuid_feature, 3008 .cpu_enable = cpu_enable_sme2, 3009 ARM64_CPUID_FIELDS(ID_AA64PFR1_EL1, SME, SME2) 3010 }, 3011 #endif /* CONFIG_ARM64_SME */ 3012 { 3013 .desc = "WFx with timeout", 3014 .capability = ARM64_HAS_WFXT, 3015 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3016 .matches = has_cpuid_feature, 3017 ARM64_CPUID_FIELDS(ID_AA64ISAR2_EL1, WFxT, IMP) 3018 }, 3019 { 3020 .desc = "Trap EL0 IMPLEMENTATION DEFINED functionality", 3021 .capability = ARM64_HAS_TIDCP1, 3022 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3023 .matches = has_cpuid_feature, 3024 .cpu_enable = cpu_trap_el0_impdef, 3025 ARM64_CPUID_FIELDS(ID_AA64MMFR1_EL1, TIDCP1, IMP) 3026 }, 3027 { 3028 .desc = "Data independent timing control (DIT)", 3029 .capability = ARM64_HAS_DIT, 3030 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3031 .matches = has_cpuid_feature, 3032 .cpu_enable = cpu_enable_dit, 3033 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, DIT, IMP) 3034 }, 3035 { 3036 .desc = "Memory Copy and Memory Set instructions", 3037 .capability = ARM64_HAS_MOPS, 3038 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3039 .matches = has_cpuid_feature, 3040 .cpu_enable = cpu_enable_mops, 3041 ARM64_CPUID_FIELDS(ID_AA64ISAR2_EL1, MOPS, IMP) 3042 }, 3043 { 3044 .capability = ARM64_HAS_TCR2, 3045 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3046 .matches = has_cpuid_feature, 3047 ARM64_CPUID_FIELDS(ID_AA64MMFR3_EL1, TCRX, IMP) 3048 }, 3049 { 3050 .desc = "Stage-1 Permission Indirection Extension (S1PIE)", 3051 .capability = ARM64_HAS_S1PIE, 3052 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 3053 .matches = has_cpuid_feature, 3054 ARM64_CPUID_FIELDS(ID_AA64MMFR3_EL1, S1PIE, IMP) 3055 }, 3056 { 3057 .desc = "VHE for hypervisor only", 3058 .capability = ARM64_KVM_HVHE, 3059 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3060 .matches = hvhe_possible, 3061 }, 3062 { 3063 .desc = "Enhanced Virtualization Traps", 3064 .capability = ARM64_HAS_EVT, 3065 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3066 .matches = has_cpuid_feature, 3067 ARM64_CPUID_FIELDS(ID_AA64MMFR2_EL1, EVT, IMP) 3068 }, 3069 { 3070 .desc = "BBM Level 2 without TLB conflict abort", 3071 .capability = ARM64_HAS_BBML2_NOABORT, 3072 .type = ARM64_CPUCAP_EARLY_LOCAL_CPU_FEATURE, 3073 .matches = has_bbml2_noabort, 3074 }, 3075 { 3076 .desc = "52-bit Virtual Addressing for KVM (LPA2)", 3077 .capability = ARM64_HAS_LPA2, 3078 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3079 .matches = has_lpa2, 3080 }, 3081 { 3082 .desc = "FPMR", 3083 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3084 .capability = ARM64_HAS_FPMR, 3085 .matches = has_cpuid_feature, 3086 .cpu_enable = cpu_enable_fpmr, 3087 ARM64_CPUID_FIELDS(ID_AA64PFR2_EL1, FPMR, IMP) 3088 }, 3089 #ifdef CONFIG_ARM64_VA_BITS_52 3090 { 3091 .capability = ARM64_HAS_VA52, 3092 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 3093 .matches = has_cpuid_feature, 3094 #ifdef CONFIG_ARM64_64K_PAGES 3095 .desc = "52-bit Virtual Addressing (LVA)", 3096 ARM64_CPUID_FIELDS(ID_AA64MMFR2_EL1, VARange, 52) 3097 #else 3098 .desc = "52-bit Virtual Addressing (LPA2)", 3099 #ifdef CONFIG_ARM64_4K_PAGES 3100 ARM64_CPUID_FIELDS(ID_AA64MMFR0_EL1, TGRAN4, 52_BIT) 3101 #else 3102 ARM64_CPUID_FIELDS(ID_AA64MMFR0_EL1, TGRAN16, 52_BIT) 3103 #endif 3104 #endif 3105 }, 3106 #endif 3107 { 3108 .desc = "Memory Partitioning And Monitoring", 3109 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3110 .capability = ARM64_MPAM, 3111 .matches = test_has_mpam, 3112 .cpu_enable = cpu_enable_mpam, 3113 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, MPAM, 1) 3114 }, 3115 { 3116 .desc = "Memory Partitioning And Monitoring Virtualisation", 3117 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3118 .capability = ARM64_MPAM_HCR, 3119 .matches = test_has_mpam_hcr, 3120 }, 3121 { 3122 .desc = "NV1", 3123 .capability = ARM64_HAS_HCR_NV1, 3124 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3125 .matches = has_nv1, 3126 ARM64_CPUID_FIELDS_NEG(ID_AA64MMFR4_EL1, E2H0, NI_NV1) 3127 }, 3128 #ifdef CONFIG_ARM64_POE 3129 { 3130 .desc = "Stage-1 Permission Overlay Extension (S1POE)", 3131 .capability = ARM64_HAS_S1POE, 3132 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 3133 .matches = has_cpuid_feature, 3134 .cpu_enable = cpu_enable_poe, 3135 ARM64_CPUID_FIELDS(ID_AA64MMFR3_EL1, S1POE, IMP) 3136 }, 3137 #endif 3138 #ifdef CONFIG_ARM64_GCS 3139 { 3140 .desc = "Guarded Control Stack (GCS)", 3141 .capability = ARM64_HAS_GCS, 3142 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3143 .cpu_enable = cpu_enable_gcs, 3144 .matches = has_cpuid_feature, 3145 ARM64_CPUID_FIELDS(ID_AA64PFR1_EL1, GCS, IMP) 3146 }, 3147 #endif 3148 #ifdef CONFIG_HW_PERF_EVENTS 3149 { 3150 .desc = "PMUv3", 3151 .capability = ARM64_HAS_PMUV3, 3152 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3153 .matches = has_pmuv3, 3154 }, 3155 #endif 3156 { 3157 .desc = "SCTLR2", 3158 .capability = ARM64_HAS_SCTLR2, 3159 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3160 .matches = has_cpuid_feature, 3161 ARM64_CPUID_FIELDS(ID_AA64MMFR3_EL1, SCTLRX, IMP) 3162 }, 3163 { 3164 .desc = "GICv5 CPU interface", 3165 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, 3166 .capability = ARM64_HAS_GICV5_CPUIF, 3167 .matches = has_cpuid_feature, 3168 ARM64_CPUID_FIELDS(ID_AA64PFR2_EL1, GCIE, IMP) 3169 }, 3170 {}, 3171 }; 3172 3173 #define HWCAP_CPUID_MATCH(reg, field, min_value) \ 3174 .matches = has_user_cpuid_feature, \ 3175 ARM64_CPUID_FIELDS(reg, field, min_value) 3176 3177 #define __HWCAP_CAP(name, cap_type, cap) \ 3178 .desc = name, \ 3179 .type = ARM64_CPUCAP_SYSTEM_FEATURE, \ 3180 .hwcap_type = cap_type, \ 3181 .hwcap = cap, \ 3182 3183 #define HWCAP_CAP(reg, field, min_value, cap_type, cap) \ 3184 { \ 3185 __HWCAP_CAP(#cap, cap_type, cap) \ 3186 HWCAP_CPUID_MATCH(reg, field, min_value) \ 3187 } 3188 3189 #define HWCAP_MULTI_CAP(list, cap_type, cap) \ 3190 { \ 3191 __HWCAP_CAP(#cap, cap_type, cap) \ 3192 .matches = cpucap_multi_entry_cap_matches, \ 3193 .match_list = list, \ 3194 } 3195 3196 #define HWCAP_CAP_MATCH(match, cap_type, cap) \ 3197 { \ 3198 __HWCAP_CAP(#cap, cap_type, cap) \ 3199 .matches = match, \ 3200 } 3201 3202 #define HWCAP_CAP_MATCH_ID(match, reg, field, min_value, cap_type, cap) \ 3203 { \ 3204 __HWCAP_CAP(#cap, cap_type, cap) \ 3205 HWCAP_CPUID_MATCH(reg, field, min_value) \ 3206 .matches = match, \ 3207 } 3208 3209 #ifdef CONFIG_ARM64_PTR_AUTH 3210 static const struct arm64_cpu_capabilities ptr_auth_hwcap_addr_matches[] = { 3211 { 3212 HWCAP_CPUID_MATCH(ID_AA64ISAR1_EL1, APA, PAuth) 3213 }, 3214 { 3215 HWCAP_CPUID_MATCH(ID_AA64ISAR2_EL1, APA3, PAuth) 3216 }, 3217 { 3218 HWCAP_CPUID_MATCH(ID_AA64ISAR1_EL1, API, PAuth) 3219 }, 3220 {}, 3221 }; 3222 3223 static const struct arm64_cpu_capabilities ptr_auth_hwcap_gen_matches[] = { 3224 { 3225 HWCAP_CPUID_MATCH(ID_AA64ISAR1_EL1, GPA, IMP) 3226 }, 3227 { 3228 HWCAP_CPUID_MATCH(ID_AA64ISAR2_EL1, GPA3, IMP) 3229 }, 3230 { 3231 HWCAP_CPUID_MATCH(ID_AA64ISAR1_EL1, GPI, IMP) 3232 }, 3233 {}, 3234 }; 3235 #endif 3236 3237 #ifdef CONFIG_ARM64_SVE 3238 static bool has_sve_feature(const struct arm64_cpu_capabilities *cap, int scope) 3239 { 3240 return system_supports_sve() && has_user_cpuid_feature(cap, scope); 3241 } 3242 #endif 3243 3244 #ifdef CONFIG_ARM64_SME 3245 static bool has_sme_feature(const struct arm64_cpu_capabilities *cap, int scope) 3246 { 3247 return system_supports_sme() && has_user_cpuid_feature(cap, scope); 3248 } 3249 #endif 3250 3251 static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = { 3252 HWCAP_CAP(ID_AA64ISAR0_EL1, AES, PMULL, CAP_HWCAP, KERNEL_HWCAP_PMULL), 3253 HWCAP_CAP(ID_AA64ISAR0_EL1, AES, AES, CAP_HWCAP, KERNEL_HWCAP_AES), 3254 HWCAP_CAP(ID_AA64ISAR0_EL1, SHA1, IMP, CAP_HWCAP, KERNEL_HWCAP_SHA1), 3255 HWCAP_CAP(ID_AA64ISAR0_EL1, SHA2, SHA256, CAP_HWCAP, KERNEL_HWCAP_SHA2), 3256 HWCAP_CAP(ID_AA64ISAR0_EL1, SHA2, SHA512, CAP_HWCAP, KERNEL_HWCAP_SHA512), 3257 HWCAP_CAP(ID_AA64ISAR0_EL1, CRC32, IMP, CAP_HWCAP, KERNEL_HWCAP_CRC32), 3258 HWCAP_CAP(ID_AA64ISAR0_EL1, ATOMIC, IMP, CAP_HWCAP, KERNEL_HWCAP_ATOMICS), 3259 HWCAP_CAP(ID_AA64ISAR0_EL1, ATOMIC, FEAT_LSE128, CAP_HWCAP, KERNEL_HWCAP_LSE128), 3260 HWCAP_CAP(ID_AA64ISAR0_EL1, RDM, IMP, CAP_HWCAP, KERNEL_HWCAP_ASIMDRDM), 3261 HWCAP_CAP(ID_AA64ISAR0_EL1, SHA3, IMP, CAP_HWCAP, KERNEL_HWCAP_SHA3), 3262 HWCAP_CAP(ID_AA64ISAR0_EL1, SM3, IMP, CAP_HWCAP, KERNEL_HWCAP_SM3), 3263 HWCAP_CAP(ID_AA64ISAR0_EL1, SM4, IMP, CAP_HWCAP, KERNEL_HWCAP_SM4), 3264 HWCAP_CAP(ID_AA64ISAR0_EL1, DP, IMP, CAP_HWCAP, KERNEL_HWCAP_ASIMDDP), 3265 HWCAP_CAP(ID_AA64ISAR0_EL1, FHM, IMP, CAP_HWCAP, KERNEL_HWCAP_ASIMDFHM), 3266 HWCAP_CAP(ID_AA64ISAR0_EL1, TS, FLAGM, CAP_HWCAP, KERNEL_HWCAP_FLAGM), 3267 HWCAP_CAP(ID_AA64ISAR0_EL1, TS, FLAGM2, CAP_HWCAP, KERNEL_HWCAP_FLAGM2), 3268 HWCAP_CAP(ID_AA64ISAR0_EL1, RNDR, IMP, CAP_HWCAP, KERNEL_HWCAP_RNG), 3269 HWCAP_CAP(ID_AA64ISAR3_EL1, FPRCVT, IMP, CAP_HWCAP, KERNEL_HWCAP_FPRCVT), 3270 HWCAP_CAP(ID_AA64PFR0_EL1, FP, IMP, CAP_HWCAP, KERNEL_HWCAP_FP), 3271 HWCAP_CAP(ID_AA64PFR0_EL1, FP, FP16, CAP_HWCAP, KERNEL_HWCAP_FPHP), 3272 HWCAP_CAP(ID_AA64PFR0_EL1, AdvSIMD, IMP, CAP_HWCAP, KERNEL_HWCAP_ASIMD), 3273 HWCAP_CAP(ID_AA64PFR0_EL1, AdvSIMD, FP16, CAP_HWCAP, KERNEL_HWCAP_ASIMDHP), 3274 HWCAP_CAP(ID_AA64PFR0_EL1, DIT, IMP, CAP_HWCAP, KERNEL_HWCAP_DIT), 3275 HWCAP_CAP(ID_AA64PFR2_EL1, FPMR, IMP, CAP_HWCAP, KERNEL_HWCAP_FPMR), 3276 HWCAP_CAP(ID_AA64ISAR1_EL1, DPB, IMP, CAP_HWCAP, KERNEL_HWCAP_DCPOP), 3277 HWCAP_CAP(ID_AA64ISAR1_EL1, DPB, DPB2, CAP_HWCAP, KERNEL_HWCAP_DCPODP), 3278 HWCAP_CAP(ID_AA64ISAR1_EL1, JSCVT, IMP, CAP_HWCAP, KERNEL_HWCAP_JSCVT), 3279 HWCAP_CAP(ID_AA64ISAR1_EL1, FCMA, IMP, CAP_HWCAP, KERNEL_HWCAP_FCMA), 3280 HWCAP_CAP(ID_AA64ISAR1_EL1, LRCPC, IMP, CAP_HWCAP, KERNEL_HWCAP_LRCPC), 3281 HWCAP_CAP(ID_AA64ISAR1_EL1, LRCPC, LRCPC2, CAP_HWCAP, KERNEL_HWCAP_ILRCPC), 3282 HWCAP_CAP(ID_AA64ISAR1_EL1, LRCPC, LRCPC3, CAP_HWCAP, KERNEL_HWCAP_LRCPC3), 3283 HWCAP_CAP(ID_AA64ISAR1_EL1, FRINTTS, IMP, CAP_HWCAP, KERNEL_HWCAP_FRINT), 3284 HWCAP_CAP(ID_AA64ISAR1_EL1, SB, IMP, CAP_HWCAP, KERNEL_HWCAP_SB), 3285 HWCAP_CAP(ID_AA64ISAR1_EL1, BF16, IMP, CAP_HWCAP, KERNEL_HWCAP_BF16), 3286 HWCAP_CAP(ID_AA64ISAR1_EL1, BF16, EBF16, CAP_HWCAP, KERNEL_HWCAP_EBF16), 3287 HWCAP_CAP(ID_AA64ISAR1_EL1, DGH, IMP, CAP_HWCAP, KERNEL_HWCAP_DGH), 3288 HWCAP_CAP(ID_AA64ISAR1_EL1, I8MM, IMP, CAP_HWCAP, KERNEL_HWCAP_I8MM), 3289 HWCAP_CAP(ID_AA64ISAR2_EL1, LUT, IMP, CAP_HWCAP, KERNEL_HWCAP_LUT), 3290 HWCAP_CAP(ID_AA64ISAR3_EL1, FAMINMAX, IMP, CAP_HWCAP, KERNEL_HWCAP_FAMINMAX), 3291 HWCAP_CAP(ID_AA64ISAR3_EL1, LSFE, IMP, CAP_HWCAP, KERNEL_HWCAP_LSFE), 3292 HWCAP_CAP(ID_AA64MMFR2_EL1, AT, IMP, CAP_HWCAP, KERNEL_HWCAP_USCAT), 3293 #ifdef CONFIG_ARM64_SVE 3294 HWCAP_CAP(ID_AA64PFR0_EL1, SVE, IMP, CAP_HWCAP, KERNEL_HWCAP_SVE), 3295 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, SVEver, SVE2p2, CAP_HWCAP, KERNEL_HWCAP_SVE2P2), 3296 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, SVEver, SVE2p1, CAP_HWCAP, KERNEL_HWCAP_SVE2P1), 3297 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, SVEver, SVE2, CAP_HWCAP, KERNEL_HWCAP_SVE2), 3298 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, AES, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEAES), 3299 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, AES, PMULL128, CAP_HWCAP, KERNEL_HWCAP_SVEPMULL), 3300 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, AES, AES2, CAP_HWCAP, KERNEL_HWCAP_SVE_AES2), 3301 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, BitPerm, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEBITPERM), 3302 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, B16B16, IMP, CAP_HWCAP, KERNEL_HWCAP_SVE_B16B16), 3303 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, B16B16, BFSCALE, CAP_HWCAP, KERNEL_HWCAP_SVE_BFSCALE), 3304 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, BF16, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEBF16), 3305 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, BF16, EBF16, CAP_HWCAP, KERNEL_HWCAP_SVE_EBF16), 3306 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, SHA3, IMP, CAP_HWCAP, KERNEL_HWCAP_SVESHA3), 3307 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, SM4, IMP, CAP_HWCAP, KERNEL_HWCAP_SVESM4), 3308 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, I8MM, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEI8MM), 3309 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, F32MM, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEF32MM), 3310 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, F64MM, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEF64MM), 3311 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, F16MM, IMP, CAP_HWCAP, KERNEL_HWCAP_SVE_F16MM), 3312 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, EltPerm, IMP, CAP_HWCAP, KERNEL_HWCAP_SVE_ELTPERM), 3313 #endif 3314 #ifdef CONFIG_ARM64_GCS 3315 HWCAP_CAP(ID_AA64PFR1_EL1, GCS, IMP, CAP_HWCAP, KERNEL_HWCAP_GCS), 3316 #endif 3317 HWCAP_CAP(ID_AA64PFR1_EL1, SSBS, SSBS2, CAP_HWCAP, KERNEL_HWCAP_SSBS), 3318 #ifdef CONFIG_ARM64_BTI 3319 HWCAP_CAP(ID_AA64PFR1_EL1, BT, IMP, CAP_HWCAP, KERNEL_HWCAP_BTI), 3320 #endif 3321 #ifdef CONFIG_ARM64_PTR_AUTH 3322 HWCAP_MULTI_CAP(ptr_auth_hwcap_addr_matches, CAP_HWCAP, KERNEL_HWCAP_PACA), 3323 HWCAP_MULTI_CAP(ptr_auth_hwcap_gen_matches, CAP_HWCAP, KERNEL_HWCAP_PACG), 3324 #endif 3325 #ifdef CONFIG_ARM64_MTE 3326 HWCAP_CAP(ID_AA64PFR1_EL1, MTE, MTE2, CAP_HWCAP, KERNEL_HWCAP_MTE), 3327 HWCAP_CAP(ID_AA64PFR1_EL1, MTE, MTE3, CAP_HWCAP, KERNEL_HWCAP_MTE3), 3328 HWCAP_CAP(ID_AA64PFR2_EL1, MTEFAR, IMP, CAP_HWCAP, KERNEL_HWCAP_MTE_FAR), 3329 HWCAP_CAP(ID_AA64PFR2_EL1, MTESTOREONLY, IMP, CAP_HWCAP , KERNEL_HWCAP_MTE_STORE_ONLY), 3330 #endif /* CONFIG_ARM64_MTE */ 3331 HWCAP_CAP(ID_AA64MMFR0_EL1, ECV, IMP, CAP_HWCAP, KERNEL_HWCAP_ECV), 3332 HWCAP_CAP(ID_AA64MMFR1_EL1, AFP, IMP, CAP_HWCAP, KERNEL_HWCAP_AFP), 3333 HWCAP_CAP(ID_AA64ISAR2_EL1, CSSC, IMP, CAP_HWCAP, KERNEL_HWCAP_CSSC), 3334 HWCAP_CAP(ID_AA64ISAR2_EL1, CSSC, CMPBR, CAP_HWCAP, KERNEL_HWCAP_CMPBR), 3335 HWCAP_CAP(ID_AA64ISAR2_EL1, RPRFM, IMP, CAP_HWCAP, KERNEL_HWCAP_RPRFM), 3336 HWCAP_CAP(ID_AA64ISAR2_EL1, RPRES, IMP, CAP_HWCAP, KERNEL_HWCAP_RPRES), 3337 HWCAP_CAP(ID_AA64ISAR2_EL1, WFxT, IMP, CAP_HWCAP, KERNEL_HWCAP_WFXT), 3338 HWCAP_CAP(ID_AA64ISAR2_EL1, MOPS, IMP, CAP_HWCAP, KERNEL_HWCAP_MOPS), 3339 HWCAP_CAP(ID_AA64ISAR2_EL1, BC, IMP, CAP_HWCAP, KERNEL_HWCAP_HBC), 3340 #ifdef CONFIG_ARM64_SME 3341 HWCAP_CAP(ID_AA64PFR1_EL1, SME, IMP, CAP_HWCAP, KERNEL_HWCAP_SME), 3342 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, FA64, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_FA64), 3343 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, LUTv2, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_LUTV2), 3344 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, SMEver, SME2p2, CAP_HWCAP, KERNEL_HWCAP_SME2P2), 3345 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, SMEver, SME2p1, CAP_HWCAP, KERNEL_HWCAP_SME2P1), 3346 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, SMEver, SME2, CAP_HWCAP, KERNEL_HWCAP_SME2), 3347 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, I16I64, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_I16I64), 3348 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, F64F64, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_F64F64), 3349 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, I16I32, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_I16I32), 3350 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, B16B16, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_B16B16), 3351 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, F16F16, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_F16F16), 3352 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, F8F16, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_F8F16), 3353 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, F8F32, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_F8F32), 3354 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, I8I32, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_I8I32), 3355 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, F16F32, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_F16F32), 3356 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, B16F32, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_B16F32), 3357 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, BI32I32, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_BI32I32), 3358 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, F32F32, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_F32F32), 3359 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, SF8FMA, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_SF8FMA), 3360 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, SF8DP4, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_SF8DP4), 3361 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, SF8DP2, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_SF8DP2), 3362 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, SBitPerm, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_SBITPERM), 3363 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, AES, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_AES), 3364 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, SFEXPA, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_SFEXPA), 3365 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, STMOP, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_STMOP), 3366 HWCAP_CAP_MATCH_ID(has_sme_feature, ID_AA64SMFR0_EL1, SMOP4, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_SMOP4), 3367 #endif /* CONFIG_ARM64_SME */ 3368 HWCAP_CAP(ID_AA64FPFR0_EL1, F8CVT, IMP, CAP_HWCAP, KERNEL_HWCAP_F8CVT), 3369 HWCAP_CAP(ID_AA64FPFR0_EL1, F8FMA, IMP, CAP_HWCAP, KERNEL_HWCAP_F8FMA), 3370 HWCAP_CAP(ID_AA64FPFR0_EL1, F8DP4, IMP, CAP_HWCAP, KERNEL_HWCAP_F8DP4), 3371 HWCAP_CAP(ID_AA64FPFR0_EL1, F8DP2, IMP, CAP_HWCAP, KERNEL_HWCAP_F8DP2), 3372 HWCAP_CAP(ID_AA64FPFR0_EL1, F8MM8, IMP, CAP_HWCAP, KERNEL_HWCAP_F8MM8), 3373 HWCAP_CAP(ID_AA64FPFR0_EL1, F8MM4, IMP, CAP_HWCAP, KERNEL_HWCAP_F8MM4), 3374 HWCAP_CAP(ID_AA64FPFR0_EL1, F8E4M3, IMP, CAP_HWCAP, KERNEL_HWCAP_F8E4M3), 3375 HWCAP_CAP(ID_AA64FPFR0_EL1, F8E5M2, IMP, CAP_HWCAP, KERNEL_HWCAP_F8E5M2), 3376 #ifdef CONFIG_ARM64_POE 3377 HWCAP_CAP(ID_AA64MMFR3_EL1, S1POE, IMP, CAP_HWCAP, KERNEL_HWCAP_POE), 3378 #endif 3379 {}, 3380 }; 3381 3382 #ifdef CONFIG_COMPAT 3383 static bool compat_has_neon(const struct arm64_cpu_capabilities *cap, int scope) 3384 { 3385 /* 3386 * Check that all of MVFR1_EL1.{SIMDSP, SIMDInt, SIMDLS} are available, 3387 * in line with that of arm32 as in vfp_init(). We make sure that the 3388 * check is future proof, by making sure value is non-zero. 3389 */ 3390 u32 mvfr1; 3391 3392 WARN_ON(scope == SCOPE_LOCAL_CPU && preemptible()); 3393 if (scope == SCOPE_SYSTEM) 3394 mvfr1 = read_sanitised_ftr_reg(SYS_MVFR1_EL1); 3395 else 3396 mvfr1 = read_sysreg_s(SYS_MVFR1_EL1); 3397 3398 return cpuid_feature_extract_unsigned_field(mvfr1, MVFR1_EL1_SIMDSP_SHIFT) && 3399 cpuid_feature_extract_unsigned_field(mvfr1, MVFR1_EL1_SIMDInt_SHIFT) && 3400 cpuid_feature_extract_unsigned_field(mvfr1, MVFR1_EL1_SIMDLS_SHIFT); 3401 } 3402 #endif 3403 3404 static const struct arm64_cpu_capabilities compat_elf_hwcaps[] = { 3405 #ifdef CONFIG_COMPAT 3406 HWCAP_CAP_MATCH(compat_has_neon, CAP_COMPAT_HWCAP, COMPAT_HWCAP_NEON), 3407 HWCAP_CAP(MVFR1_EL1, SIMDFMAC, IMP, CAP_COMPAT_HWCAP, COMPAT_HWCAP_VFPv4), 3408 /* Arm v8 mandates MVFR0.FPDP == {0, 2}. So, piggy back on this for the presence of VFP support */ 3409 HWCAP_CAP(MVFR0_EL1, FPDP, VFPv3, CAP_COMPAT_HWCAP, COMPAT_HWCAP_VFP), 3410 HWCAP_CAP(MVFR0_EL1, FPDP, VFPv3, CAP_COMPAT_HWCAP, COMPAT_HWCAP_VFPv3), 3411 HWCAP_CAP(MVFR1_EL1, FPHP, FP16, CAP_COMPAT_HWCAP, COMPAT_HWCAP_FPHP), 3412 HWCAP_CAP(MVFR1_EL1, SIMDHP, SIMDHP_FLOAT, CAP_COMPAT_HWCAP, COMPAT_HWCAP_ASIMDHP), 3413 HWCAP_CAP(ID_ISAR5_EL1, AES, VMULL, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_PMULL), 3414 HWCAP_CAP(ID_ISAR5_EL1, AES, IMP, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_AES), 3415 HWCAP_CAP(ID_ISAR5_EL1, SHA1, IMP, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SHA1), 3416 HWCAP_CAP(ID_ISAR5_EL1, SHA2, IMP, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SHA2), 3417 HWCAP_CAP(ID_ISAR5_EL1, CRC32, IMP, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_CRC32), 3418 HWCAP_CAP(ID_ISAR6_EL1, DP, IMP, CAP_COMPAT_HWCAP, COMPAT_HWCAP_ASIMDDP), 3419 HWCAP_CAP(ID_ISAR6_EL1, FHM, IMP, CAP_COMPAT_HWCAP, COMPAT_HWCAP_ASIMDFHM), 3420 HWCAP_CAP(ID_ISAR6_EL1, SB, IMP, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SB), 3421 HWCAP_CAP(ID_ISAR6_EL1, BF16, IMP, CAP_COMPAT_HWCAP, COMPAT_HWCAP_ASIMDBF16), 3422 HWCAP_CAP(ID_ISAR6_EL1, I8MM, IMP, CAP_COMPAT_HWCAP, COMPAT_HWCAP_I8MM), 3423 HWCAP_CAP(ID_PFR2_EL1, SSBS, IMP, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SSBS), 3424 #endif 3425 {}, 3426 }; 3427 3428 static void cap_set_elf_hwcap(const struct arm64_cpu_capabilities *cap) 3429 { 3430 switch (cap->hwcap_type) { 3431 case CAP_HWCAP: 3432 cpu_set_feature(cap->hwcap); 3433 break; 3434 #ifdef CONFIG_COMPAT 3435 case CAP_COMPAT_HWCAP: 3436 compat_elf_hwcap |= (u32)cap->hwcap; 3437 break; 3438 case CAP_COMPAT_HWCAP2: 3439 compat_elf_hwcap2 |= (u32)cap->hwcap; 3440 break; 3441 #endif 3442 default: 3443 WARN_ON(1); 3444 break; 3445 } 3446 } 3447 3448 /* Check if we have a particular HWCAP enabled */ 3449 static bool cpus_have_elf_hwcap(const struct arm64_cpu_capabilities *cap) 3450 { 3451 bool rc; 3452 3453 switch (cap->hwcap_type) { 3454 case CAP_HWCAP: 3455 rc = cpu_have_feature(cap->hwcap); 3456 break; 3457 #ifdef CONFIG_COMPAT 3458 case CAP_COMPAT_HWCAP: 3459 rc = (compat_elf_hwcap & (u32)cap->hwcap) != 0; 3460 break; 3461 case CAP_COMPAT_HWCAP2: 3462 rc = (compat_elf_hwcap2 & (u32)cap->hwcap) != 0; 3463 break; 3464 #endif 3465 default: 3466 WARN_ON(1); 3467 rc = false; 3468 } 3469 3470 return rc; 3471 } 3472 3473 static void setup_elf_hwcaps(const struct arm64_cpu_capabilities *hwcaps) 3474 { 3475 /* We support emulation of accesses to CPU ID feature registers */ 3476 cpu_set_named_feature(CPUID); 3477 for (; hwcaps->matches; hwcaps++) 3478 if (hwcaps->matches(hwcaps, cpucap_default_scope(hwcaps))) 3479 cap_set_elf_hwcap(hwcaps); 3480 } 3481 3482 static void update_cpu_capabilities(u16 scope_mask) 3483 { 3484 int i; 3485 const struct arm64_cpu_capabilities *caps; 3486 3487 scope_mask &= ARM64_CPUCAP_SCOPE_MASK; 3488 for (i = 0; i < ARM64_NCAPS; i++) { 3489 bool match_all = false; 3490 bool caps_set = false; 3491 bool boot_cpu = false; 3492 3493 caps = cpucap_ptrs[i]; 3494 if (!caps || !(caps->type & scope_mask)) 3495 continue; 3496 3497 match_all = cpucap_match_all_early_cpus(caps); 3498 caps_set = cpus_have_cap(caps->capability); 3499 boot_cpu = scope_mask & SCOPE_BOOT_CPU; 3500 3501 /* 3502 * Unless it's a match-all CPUs feature, avoid probing if 3503 * already detected. 3504 */ 3505 if (!match_all && caps_set) 3506 continue; 3507 3508 /* 3509 * A match-all CPUs capability is only set when probing the 3510 * boot CPU. It may be cleared subsequently if not detected on 3511 * secondary ones. 3512 */ 3513 if (match_all && !caps_set && !boot_cpu) 3514 continue; 3515 3516 if (!caps->matches(caps, cpucap_default_scope(caps))) { 3517 if (match_all) 3518 __clear_bit(caps->capability, system_cpucaps); 3519 continue; 3520 } 3521 3522 /* 3523 * Match-all CPUs capabilities are logged later when the 3524 * system capabilities are finalised. 3525 */ 3526 if (!match_all && caps->desc && !caps->cpus) 3527 pr_info("detected: %s\n", caps->desc); 3528 3529 __set_bit(caps->capability, system_cpucaps); 3530 3531 if (boot_cpu && (caps->type & SCOPE_BOOT_CPU)) 3532 set_bit(caps->capability, boot_cpucaps); 3533 } 3534 } 3535 3536 /* 3537 * Enable all the available capabilities on this CPU. The capabilities 3538 * with BOOT_CPU scope are handled separately and hence skipped here. 3539 */ 3540 static int cpu_enable_non_boot_scope_capabilities(void *__unused) 3541 { 3542 int i; 3543 u16 non_boot_scope = SCOPE_ALL & ~SCOPE_BOOT_CPU; 3544 3545 for_each_available_cap(i) { 3546 const struct arm64_cpu_capabilities *cap = cpucap_ptrs[i]; 3547 3548 if (WARN_ON(!cap)) 3549 continue; 3550 3551 if (!(cap->type & non_boot_scope)) 3552 continue; 3553 3554 if (cap->cpu_enable) 3555 cap->cpu_enable(cap); 3556 } 3557 return 0; 3558 } 3559 3560 /* 3561 * Run through the enabled capabilities and enable() it on all active 3562 * CPUs 3563 */ 3564 static void __init enable_cpu_capabilities(u16 scope_mask) 3565 { 3566 int i; 3567 const struct arm64_cpu_capabilities *caps; 3568 bool boot_scope; 3569 3570 scope_mask &= ARM64_CPUCAP_SCOPE_MASK; 3571 boot_scope = !!(scope_mask & SCOPE_BOOT_CPU); 3572 3573 for (i = 0; i < ARM64_NCAPS; i++) { 3574 caps = cpucap_ptrs[i]; 3575 if (!caps || !(caps->type & scope_mask) || 3576 !cpus_have_cap(caps->capability)) 3577 continue; 3578 3579 if (boot_scope && caps->cpu_enable) 3580 /* 3581 * Capabilities with SCOPE_BOOT_CPU scope are finalised 3582 * before any secondary CPU boots. Thus, each secondary 3583 * will enable the capability as appropriate via 3584 * check_local_cpu_capabilities(). The only exception is 3585 * the boot CPU, for which the capability must be 3586 * enabled here. This approach avoids costly 3587 * stop_machine() calls for this case. 3588 */ 3589 caps->cpu_enable(caps); 3590 } 3591 3592 /* 3593 * For all non-boot scope capabilities, use stop_machine() 3594 * as it schedules the work allowing us to modify PSTATE, 3595 * instead of on_each_cpu() which uses an IPI, giving us a 3596 * PSTATE that disappears when we return. 3597 */ 3598 if (!boot_scope) 3599 stop_machine(cpu_enable_non_boot_scope_capabilities, 3600 NULL, cpu_online_mask); 3601 } 3602 3603 /* 3604 * Run through the list of capabilities to check for conflicts. 3605 * If the system has already detected a capability, take necessary 3606 * action on this CPU. 3607 */ 3608 static void verify_local_cpu_caps(u16 scope_mask) 3609 { 3610 int i; 3611 bool cpu_has_cap, system_has_cap; 3612 const struct arm64_cpu_capabilities *caps; 3613 3614 scope_mask &= ARM64_CPUCAP_SCOPE_MASK; 3615 3616 for (i = 0; i < ARM64_NCAPS; i++) { 3617 caps = cpucap_ptrs[i]; 3618 if (!caps || !(caps->type & scope_mask)) 3619 continue; 3620 3621 cpu_has_cap = caps->matches(caps, SCOPE_LOCAL_CPU); 3622 system_has_cap = cpus_have_cap(caps->capability); 3623 3624 if (system_has_cap) { 3625 /* 3626 * Check if the new CPU misses an advertised feature, 3627 * which is not safe to miss. 3628 */ 3629 if (!cpu_has_cap && !cpucap_late_cpu_optional(caps)) 3630 break; 3631 /* 3632 * We have to issue cpu_enable() irrespective of 3633 * whether the CPU has it or not, as it is enabeld 3634 * system wide. It is upto the call back to take 3635 * appropriate action on this CPU. 3636 */ 3637 if (caps->cpu_enable) 3638 caps->cpu_enable(caps); 3639 } else { 3640 /* 3641 * Check if the CPU has this capability if it isn't 3642 * safe to have when the system doesn't. 3643 */ 3644 if (cpu_has_cap && !cpucap_late_cpu_permitted(caps)) 3645 break; 3646 } 3647 } 3648 3649 if (i < ARM64_NCAPS) { 3650 pr_crit("CPU%d: Detected conflict for capability %d (%s), System: %d, CPU: %d\n", 3651 smp_processor_id(), caps->capability, 3652 caps->desc, system_has_cap, cpu_has_cap); 3653 3654 if (cpucap_panic_on_conflict(caps)) 3655 cpu_panic_kernel(); 3656 else 3657 cpu_die_early(); 3658 } 3659 } 3660 3661 /* 3662 * Check for CPU features that are used in early boot 3663 * based on the Boot CPU value. 3664 */ 3665 static void check_early_cpu_features(void) 3666 { 3667 verify_cpu_asid_bits(); 3668 3669 verify_local_cpu_caps(SCOPE_BOOT_CPU); 3670 } 3671 3672 static void 3673 __verify_local_elf_hwcaps(const struct arm64_cpu_capabilities *caps) 3674 { 3675 3676 for (; caps->matches; caps++) 3677 if (cpus_have_elf_hwcap(caps) && !caps->matches(caps, SCOPE_LOCAL_CPU)) { 3678 pr_crit("CPU%d: missing HWCAP: %s\n", 3679 smp_processor_id(), caps->desc); 3680 cpu_die_early(); 3681 } 3682 } 3683 3684 static void verify_local_elf_hwcaps(void) 3685 { 3686 __verify_local_elf_hwcaps(arm64_elf_hwcaps); 3687 3688 if (id_aa64pfr0_32bit_el0(read_cpuid(ID_AA64PFR0_EL1))) 3689 __verify_local_elf_hwcaps(compat_elf_hwcaps); 3690 } 3691 3692 static void verify_sve_features(void) 3693 { 3694 unsigned long cpacr = cpacr_save_enable_kernel_sve(); 3695 3696 if (vec_verify_vq_map(ARM64_VEC_SVE)) { 3697 pr_crit("CPU%d: SVE: vector length support mismatch\n", 3698 smp_processor_id()); 3699 cpu_die_early(); 3700 } 3701 3702 cpacr_restore(cpacr); 3703 } 3704 3705 static void verify_sme_features(void) 3706 { 3707 unsigned long cpacr = cpacr_save_enable_kernel_sme(); 3708 3709 if (vec_verify_vq_map(ARM64_VEC_SME)) { 3710 pr_crit("CPU%d: SME: vector length support mismatch\n", 3711 smp_processor_id()); 3712 cpu_die_early(); 3713 } 3714 3715 cpacr_restore(cpacr); 3716 } 3717 3718 static void verify_hyp_capabilities(void) 3719 { 3720 u64 safe_mmfr1, mmfr0, mmfr1; 3721 int parange, ipa_max; 3722 unsigned int safe_vmid_bits, vmid_bits; 3723 3724 if (!IS_ENABLED(CONFIG_KVM)) 3725 return; 3726 3727 safe_mmfr1 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1); 3728 mmfr0 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1); 3729 mmfr1 = read_cpuid(ID_AA64MMFR1_EL1); 3730 3731 /* Verify VMID bits */ 3732 safe_vmid_bits = get_vmid_bits(safe_mmfr1); 3733 vmid_bits = get_vmid_bits(mmfr1); 3734 if (vmid_bits < safe_vmid_bits) { 3735 pr_crit("CPU%d: VMID width mismatch\n", smp_processor_id()); 3736 cpu_die_early(); 3737 } 3738 3739 /* Verify IPA range */ 3740 parange = cpuid_feature_extract_unsigned_field(mmfr0, 3741 ID_AA64MMFR0_EL1_PARANGE_SHIFT); 3742 ipa_max = id_aa64mmfr0_parange_to_phys_shift(parange); 3743 if (ipa_max < get_kvm_ipa_limit()) { 3744 pr_crit("CPU%d: IPA range mismatch\n", smp_processor_id()); 3745 cpu_die_early(); 3746 } 3747 } 3748 3749 static void verify_mpam_capabilities(void) 3750 { 3751 u64 cpu_idr = read_cpuid(ID_AA64PFR0_EL1); 3752 u64 sys_idr = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1); 3753 u16 cpu_partid_max, cpu_pmg_max, sys_partid_max, sys_pmg_max; 3754 3755 if (FIELD_GET(ID_AA64PFR0_EL1_MPAM_MASK, cpu_idr) != 3756 FIELD_GET(ID_AA64PFR0_EL1_MPAM_MASK, sys_idr)) { 3757 pr_crit("CPU%d: MPAM version mismatch\n", smp_processor_id()); 3758 cpu_die_early(); 3759 } 3760 3761 cpu_idr = read_cpuid(MPAMIDR_EL1); 3762 sys_idr = read_sanitised_ftr_reg(SYS_MPAMIDR_EL1); 3763 if (FIELD_GET(MPAMIDR_EL1_HAS_HCR, cpu_idr) != 3764 FIELD_GET(MPAMIDR_EL1_HAS_HCR, sys_idr)) { 3765 pr_crit("CPU%d: Missing MPAM HCR\n", smp_processor_id()); 3766 cpu_die_early(); 3767 } 3768 3769 cpu_partid_max = FIELD_GET(MPAMIDR_EL1_PARTID_MAX, cpu_idr); 3770 cpu_pmg_max = FIELD_GET(MPAMIDR_EL1_PMG_MAX, cpu_idr); 3771 sys_partid_max = FIELD_GET(MPAMIDR_EL1_PARTID_MAX, sys_idr); 3772 sys_pmg_max = FIELD_GET(MPAMIDR_EL1_PMG_MAX, sys_idr); 3773 if (cpu_partid_max < sys_partid_max || cpu_pmg_max < sys_pmg_max) { 3774 pr_crit("CPU%d: MPAM PARTID/PMG max values are mismatched\n", smp_processor_id()); 3775 cpu_die_early(); 3776 } 3777 } 3778 3779 /* 3780 * Run through the enabled system capabilities and enable() it on this CPU. 3781 * The capabilities were decided based on the available CPUs at the boot time. 3782 * Any new CPU should match the system wide status of the capability. If the 3783 * new CPU doesn't have a capability which the system now has enabled, we 3784 * cannot do anything to fix it up and could cause unexpected failures. So 3785 * we park the CPU. 3786 */ 3787 static void verify_local_cpu_capabilities(void) 3788 { 3789 /* 3790 * The capabilities with SCOPE_BOOT_CPU are checked from 3791 * check_early_cpu_features(), as they need to be verified 3792 * on all secondary CPUs. 3793 */ 3794 verify_local_cpu_caps(SCOPE_ALL & ~SCOPE_BOOT_CPU); 3795 verify_local_elf_hwcaps(); 3796 3797 if (system_supports_sve()) 3798 verify_sve_features(); 3799 3800 if (system_supports_sme()) 3801 verify_sme_features(); 3802 3803 if (is_hyp_mode_available()) 3804 verify_hyp_capabilities(); 3805 3806 if (system_supports_mpam()) 3807 verify_mpam_capabilities(); 3808 } 3809 3810 void check_local_cpu_capabilities(void) 3811 { 3812 /* 3813 * All secondary CPUs should conform to the early CPU features 3814 * in use by the kernel based on boot CPU. 3815 */ 3816 check_early_cpu_features(); 3817 3818 /* 3819 * If we haven't finalised the system capabilities, this CPU gets 3820 * a chance to update the errata work arounds and local features. 3821 * Otherwise, this CPU should verify that it has all the system 3822 * advertised capabilities. 3823 */ 3824 if (!system_capabilities_finalized()) 3825 update_cpu_capabilities(SCOPE_LOCAL_CPU); 3826 else 3827 verify_local_cpu_capabilities(); 3828 } 3829 3830 bool this_cpu_has_cap(unsigned int n) 3831 { 3832 if (!WARN_ON(preemptible()) && n < ARM64_NCAPS) { 3833 const struct arm64_cpu_capabilities *cap = cpucap_ptrs[n]; 3834 3835 if (cap) 3836 return cap->matches(cap, SCOPE_LOCAL_CPU); 3837 } 3838 3839 return false; 3840 } 3841 EXPORT_SYMBOL_GPL(this_cpu_has_cap); 3842 3843 /* 3844 * This helper function is used in a narrow window when, 3845 * - The system wide safe registers are set with all the SMP CPUs and, 3846 * - The SYSTEM_FEATURE system_cpucaps may not have been set. 3847 */ 3848 static bool __maybe_unused __system_matches_cap(unsigned int n) 3849 { 3850 if (n < ARM64_NCAPS) { 3851 const struct arm64_cpu_capabilities *cap = cpucap_ptrs[n]; 3852 3853 if (cap) 3854 return cap->matches(cap, SCOPE_SYSTEM); 3855 } 3856 return false; 3857 } 3858 3859 void cpu_set_feature(unsigned int num) 3860 { 3861 set_bit(num, elf_hwcap); 3862 } 3863 3864 bool cpu_have_feature(unsigned int num) 3865 { 3866 return test_bit(num, elf_hwcap); 3867 } 3868 EXPORT_SYMBOL_GPL(cpu_have_feature); 3869 3870 unsigned long cpu_get_elf_hwcap(void) 3871 { 3872 /* 3873 * We currently only populate the first 32 bits of AT_HWCAP. Please 3874 * note that for userspace compatibility we guarantee that bits 62 3875 * and 63 will always be returned as 0. 3876 */ 3877 return elf_hwcap[0]; 3878 } 3879 3880 unsigned long cpu_get_elf_hwcap2(void) 3881 { 3882 return elf_hwcap[1]; 3883 } 3884 3885 unsigned long cpu_get_elf_hwcap3(void) 3886 { 3887 return elf_hwcap[2]; 3888 } 3889 3890 static void __init setup_boot_cpu_capabilities(void) 3891 { 3892 kvm_arm_target_impl_cpu_init(); 3893 /* 3894 * The boot CPU's feature register values have been recorded. Detect 3895 * boot cpucaps and local cpucaps for the boot CPU, then enable and 3896 * patch alternatives for the available boot cpucaps. 3897 */ 3898 update_cpu_capabilities(SCOPE_BOOT_CPU | SCOPE_LOCAL_CPU); 3899 enable_cpu_capabilities(SCOPE_BOOT_CPU); 3900 apply_boot_alternatives(); 3901 } 3902 3903 void __init setup_boot_cpu_features(void) 3904 { 3905 /* 3906 * Initialize the indirect array of CPU capabilities pointers before we 3907 * handle the boot CPU. 3908 */ 3909 init_cpucap_indirect_list(); 3910 3911 /* 3912 * Detect broken pseudo-NMI. Must be called _before_ the call to 3913 * setup_boot_cpu_capabilities() since it interacts with 3914 * can_use_gic_priorities(). 3915 */ 3916 detect_system_supports_pseudo_nmi(); 3917 3918 setup_boot_cpu_capabilities(); 3919 } 3920 3921 static void __init setup_system_capabilities(void) 3922 { 3923 /* 3924 * The system-wide safe feature register values have been finalized. 3925 * Detect, enable, and patch alternatives for the available system 3926 * cpucaps. 3927 */ 3928 update_cpu_capabilities(SCOPE_SYSTEM); 3929 enable_cpu_capabilities(SCOPE_ALL & ~SCOPE_BOOT_CPU); 3930 apply_alternatives_all(); 3931 3932 for (int i = 0; i < ARM64_NCAPS; i++) { 3933 const struct arm64_cpu_capabilities *caps = cpucap_ptrs[i]; 3934 3935 if (!caps || !caps->desc) 3936 continue; 3937 3938 /* 3939 * Log any cpucaps with a cpumask as these aren't logged by 3940 * update_cpu_capabilities(). 3941 */ 3942 if (caps->cpus && cpumask_any(caps->cpus) < nr_cpu_ids) 3943 pr_info("detected: %s on CPU%*pbl\n", 3944 caps->desc, cpumask_pr_args(caps->cpus)); 3945 3946 /* Log match-all CPUs capabilities */ 3947 if (cpucap_match_all_early_cpus(caps) && 3948 cpus_have_cap(caps->capability)) 3949 pr_info("detected: %s\n", caps->desc); 3950 } 3951 3952 /* 3953 * TTBR0 PAN doesn't have its own cpucap, so log it manually. 3954 */ 3955 if (system_uses_ttbr0_pan()) 3956 pr_info("emulated: Privileged Access Never (PAN) using TTBR0_EL1 switching\n"); 3957 } 3958 3959 void __init setup_system_features(void) 3960 { 3961 setup_system_capabilities(); 3962 3963 linear_map_maybe_split_to_ptes(); 3964 kpti_install_ng_mappings(); 3965 3966 sve_setup(); 3967 sme_setup(); 3968 3969 /* 3970 * Check for sane CTR_EL0.CWG value. 3971 */ 3972 if (!cache_type_cwg()) 3973 pr_warn("No Cache Writeback Granule information, assuming %d\n", 3974 ARCH_DMA_MINALIGN); 3975 } 3976 3977 void __init setup_user_features(void) 3978 { 3979 user_feature_fixup(); 3980 3981 setup_elf_hwcaps(arm64_elf_hwcaps); 3982 3983 if (system_supports_32bit_el0()) { 3984 setup_elf_hwcaps(compat_elf_hwcaps); 3985 elf_hwcap_fixup(); 3986 } 3987 3988 minsigstksz_setup(); 3989 } 3990 3991 static int enable_mismatched_32bit_el0(unsigned int cpu) 3992 { 3993 /* 3994 * The first 32-bit-capable CPU we detected and so can no longer 3995 * be offlined by userspace. -1 indicates we haven't yet onlined 3996 * a 32-bit-capable CPU. 3997 */ 3998 static int lucky_winner = -1; 3999 4000 struct cpuinfo_arm64 *info = &per_cpu(cpu_data, cpu); 4001 bool cpu_32bit = false; 4002 4003 if (id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0)) { 4004 if (!housekeeping_cpu(cpu, HK_TYPE_TICK)) 4005 pr_info("Treating adaptive-ticks CPU %u as 64-bit only\n", cpu); 4006 else 4007 cpu_32bit = true; 4008 } 4009 4010 if (cpu_32bit) { 4011 cpumask_set_cpu(cpu, cpu_32bit_el0_mask); 4012 static_branch_enable_cpuslocked(&arm64_mismatched_32bit_el0); 4013 } 4014 4015 if (cpumask_test_cpu(0, cpu_32bit_el0_mask) == cpu_32bit) 4016 return 0; 4017 4018 if (lucky_winner >= 0) 4019 return 0; 4020 4021 /* 4022 * We've detected a mismatch. We need to keep one of our CPUs with 4023 * 32-bit EL0 online so that is_cpu_allowed() doesn't end up rejecting 4024 * every CPU in the system for a 32-bit task. 4025 */ 4026 lucky_winner = cpu_32bit ? cpu : cpumask_any_and(cpu_32bit_el0_mask, 4027 cpu_active_mask); 4028 get_cpu_device(lucky_winner)->offline_disabled = true; 4029 setup_elf_hwcaps(compat_elf_hwcaps); 4030 elf_hwcap_fixup(); 4031 pr_info("Asymmetric 32-bit EL0 support detected on CPU %u; CPU hot-unplug disabled on CPU %u\n", 4032 cpu, lucky_winner); 4033 return 0; 4034 } 4035 4036 static int __init init_32bit_el0_mask(void) 4037 { 4038 if (!allow_mismatched_32bit_el0) 4039 return 0; 4040 4041 if (!zalloc_cpumask_var(&cpu_32bit_el0_mask, GFP_KERNEL)) 4042 return -ENOMEM; 4043 4044 return cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, 4045 "arm64/mismatched_32bit_el0:online", 4046 enable_mismatched_32bit_el0, NULL); 4047 } 4048 subsys_initcall_sync(init_32bit_el0_mask); 4049 4050 static void __maybe_unused cpu_enable_cnp(struct arm64_cpu_capabilities const *cap) 4051 { 4052 cpu_enable_swapper_cnp(); 4053 } 4054 4055 /* 4056 * We emulate only the following system register space. 4057 * Op0 = 0x3, CRn = 0x0, Op1 = 0x0, CRm = [0, 2 - 7] 4058 * See Table C5-6 System instruction encodings for System register accesses, 4059 * ARMv8 ARM(ARM DDI 0487A.f) for more details. 4060 */ 4061 static inline bool __attribute_const__ is_emulated(u32 id) 4062 { 4063 return (sys_reg_Op0(id) == 0x3 && 4064 sys_reg_CRn(id) == 0x0 && 4065 sys_reg_Op1(id) == 0x0 && 4066 (sys_reg_CRm(id) == 0 || 4067 ((sys_reg_CRm(id) >= 2) && (sys_reg_CRm(id) <= 7)))); 4068 } 4069 4070 /* 4071 * With CRm == 0, reg should be one of : 4072 * MIDR_EL1, MPIDR_EL1 or REVIDR_EL1. 4073 */ 4074 static inline int emulate_id_reg(u32 id, u64 *valp) 4075 { 4076 switch (id) { 4077 case SYS_MIDR_EL1: 4078 *valp = read_cpuid_id(); 4079 break; 4080 case SYS_MPIDR_EL1: 4081 *valp = SYS_MPIDR_SAFE_VAL; 4082 break; 4083 case SYS_REVIDR_EL1: 4084 /* IMPLEMENTATION DEFINED values are emulated with 0 */ 4085 *valp = 0; 4086 break; 4087 default: 4088 return -EINVAL; 4089 } 4090 4091 return 0; 4092 } 4093 4094 static int emulate_sys_reg(u32 id, u64 *valp) 4095 { 4096 struct arm64_ftr_reg *regp; 4097 4098 if (!is_emulated(id)) 4099 return -EINVAL; 4100 4101 if (sys_reg_CRm(id) == 0) 4102 return emulate_id_reg(id, valp); 4103 4104 regp = get_arm64_ftr_reg_nowarn(id); 4105 if (regp) 4106 *valp = arm64_ftr_reg_user_value(regp); 4107 else 4108 /* 4109 * The untracked registers are either IMPLEMENTATION DEFINED 4110 * (e.g, ID_AFR0_EL1) or reserved RAZ. 4111 */ 4112 *valp = 0; 4113 return 0; 4114 } 4115 4116 int do_emulate_mrs(struct pt_regs *regs, u32 sys_reg, u32 rt) 4117 { 4118 int rc; 4119 u64 val; 4120 4121 rc = emulate_sys_reg(sys_reg, &val); 4122 if (!rc) { 4123 pt_regs_write_reg(regs, rt, val); 4124 arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE); 4125 } 4126 return rc; 4127 } 4128 4129 bool try_emulate_mrs(struct pt_regs *regs, u32 insn) 4130 { 4131 u32 sys_reg, rt; 4132 4133 if (compat_user_mode(regs) || !aarch64_insn_is_mrs(insn)) 4134 return false; 4135 4136 /* 4137 * sys_reg values are defined as used in mrs/msr instruction. 4138 * shift the imm value to get the encoding. 4139 */ 4140 sys_reg = (u32)aarch64_insn_decode_immediate(AARCH64_INSN_IMM_16, insn) << 5; 4141 rt = aarch64_insn_decode_register(AARCH64_INSN_REGTYPE_RT, insn); 4142 return do_emulate_mrs(regs, sys_reg, rt) == 0; 4143 } 4144 4145 enum mitigation_state arm64_get_meltdown_state(void) 4146 { 4147 if (__meltdown_safe) 4148 return SPECTRE_UNAFFECTED; 4149 4150 if (arm64_kernel_unmapped_at_el0()) 4151 return SPECTRE_MITIGATED; 4152 4153 return SPECTRE_VULNERABLE; 4154 } 4155 4156 ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, 4157 char *buf) 4158 { 4159 switch (arm64_get_meltdown_state()) { 4160 case SPECTRE_UNAFFECTED: 4161 return sprintf(buf, "Not affected\n"); 4162 4163 case SPECTRE_MITIGATED: 4164 return sprintf(buf, "Mitigation: PTI\n"); 4165 4166 default: 4167 return sprintf(buf, "Vulnerable\n"); 4168 } 4169 } 4170