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_context.h> 88 #include <asm/mte.h> 89 #include <asm/hypervisor.h> 90 #include <asm/processor.h> 91 #include <asm/smp.h> 92 #include <asm/sysreg.h> 93 #include <asm/traps.h> 94 #include <asm/vectors.h> 95 #include <asm/virt.h> 96 97 /* Kernel representation of AT_HWCAP and AT_HWCAP2 */ 98 static DECLARE_BITMAP(elf_hwcap, MAX_CPU_FEATURES) __read_mostly; 99 100 #ifdef CONFIG_COMPAT 101 #define COMPAT_ELF_HWCAP_DEFAULT \ 102 (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\ 103 COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\ 104 COMPAT_HWCAP_TLS|COMPAT_HWCAP_IDIV|\ 105 COMPAT_HWCAP_LPAE) 106 unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT; 107 unsigned int compat_elf_hwcap2 __read_mostly; 108 unsigned int compat_elf_hwcap3 __read_mostly; 109 #endif 110 111 DECLARE_BITMAP(system_cpucaps, ARM64_NCAPS); 112 EXPORT_SYMBOL(system_cpucaps); 113 static struct arm64_cpu_capabilities const __ro_after_init *cpucap_ptrs[ARM64_NCAPS]; 114 115 DECLARE_BITMAP(boot_cpucaps, ARM64_NCAPS); 116 117 /* 118 * arm64_use_ng_mappings must be placed in the .data section, otherwise it 119 * ends up in the .bss section where it is initialized in early_map_kernel() 120 * after the MMU (with the idmap) was enabled. create_init_idmap() - which 121 * runs before early_map_kernel() and reads the variable via PTE_MAYBE_NG - 122 * may end up generating an incorrect idmap page table attributes. 123 */ 124 bool arm64_use_ng_mappings __read_mostly = false; 125 EXPORT_SYMBOL(arm64_use_ng_mappings); 126 127 DEFINE_PER_CPU_READ_MOSTLY(const char *, this_cpu_vector) = vectors; 128 129 /* 130 * Permit PER_LINUX32 and execve() of 32-bit binaries even if not all CPUs 131 * support it? 132 */ 133 static bool __read_mostly allow_mismatched_32bit_el0; 134 135 /* 136 * Static branch enabled only if allow_mismatched_32bit_el0 is set and we have 137 * seen at least one CPU capable of 32-bit EL0. 138 */ 139 DEFINE_STATIC_KEY_FALSE(arm64_mismatched_32bit_el0); 140 141 /* 142 * Mask of CPUs supporting 32-bit EL0. 143 * Only valid if arm64_mismatched_32bit_el0 is enabled. 144 */ 145 static cpumask_var_t cpu_32bit_el0_mask __cpumask_var_read_mostly; 146 147 void dump_cpu_features(void) 148 { 149 /* file-wide pr_fmt adds "CPU features: " prefix */ 150 pr_emerg("0x%*pb\n", ARM64_NCAPS, &system_cpucaps); 151 } 152 153 #define __ARM64_MAX_POSITIVE(reg, field) \ 154 ((reg##_##field##_SIGNED ? \ 155 BIT(reg##_##field##_WIDTH - 1) : \ 156 BIT(reg##_##field##_WIDTH)) - 1) 157 158 #define __ARM64_MIN_NEGATIVE(reg, field) BIT(reg##_##field##_WIDTH - 1) 159 160 #define __ARM64_CPUID_FIELDS(reg, field, min_value, max_value) \ 161 .sys_reg = SYS_##reg, \ 162 .field_pos = reg##_##field##_SHIFT, \ 163 .field_width = reg##_##field##_WIDTH, \ 164 .sign = reg##_##field##_SIGNED, \ 165 .min_field_value = min_value, \ 166 .max_field_value = max_value, 167 168 /* 169 * ARM64_CPUID_FIELDS() encodes a field with a range from min_value to 170 * an implicit maximum that depends on the sign-ess of the field. 171 * 172 * An unsigned field will be capped at all ones, while a signed field 173 * will be limited to the positive half only. 174 */ 175 #define ARM64_CPUID_FIELDS(reg, field, min_value) \ 176 __ARM64_CPUID_FIELDS(reg, field, \ 177 SYS_FIELD_VALUE(reg, field, min_value), \ 178 __ARM64_MAX_POSITIVE(reg, field)) 179 180 /* 181 * ARM64_CPUID_FIELDS_NEG() encodes a field with a range from an 182 * implicit minimal value to max_value. This should be used when 183 * matching a non-implemented property. 184 */ 185 #define ARM64_CPUID_FIELDS_NEG(reg, field, max_value) \ 186 __ARM64_CPUID_FIELDS(reg, field, \ 187 __ARM64_MIN_NEGATIVE(reg, field), \ 188 SYS_FIELD_VALUE(reg, field, max_value)) 189 190 #define __ARM64_FTR_BITS(SIGNED, VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ 191 { \ 192 .sign = SIGNED, \ 193 .visible = VISIBLE, \ 194 .strict = STRICT, \ 195 .type = TYPE, \ 196 .shift = SHIFT, \ 197 .width = WIDTH, \ 198 .safe_val = SAFE_VAL, \ 199 } 200 201 /* Define a feature with unsigned values */ 202 #define ARM64_FTR_BITS(VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ 203 __ARM64_FTR_BITS(FTR_UNSIGNED, VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) 204 205 /* Define a feature with a signed value */ 206 #define S_ARM64_FTR_BITS(VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ 207 __ARM64_FTR_BITS(FTR_SIGNED, VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) 208 209 #define ARM64_FTR_END \ 210 { \ 211 .width = 0, \ 212 } 213 214 static void cpu_enable_cnp(struct arm64_cpu_capabilities const *cap); 215 216 static bool __system_matches_cap(unsigned int n); 217 218 /* 219 * NOTE: Any changes to the visibility of features should be kept in 220 * sync with the documentation of the CPU feature register ABI. 221 */ 222 static const struct arm64_ftr_bits ftr_id_aa64isar0[] = { 223 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_RNDR_SHIFT, 4, 0), 224 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_TLB_SHIFT, 4, 0), 225 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_TS_SHIFT, 4, 0), 226 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_FHM_SHIFT, 4, 0), 227 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_DP_SHIFT, 4, 0), 228 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_SM4_SHIFT, 4, 0), 229 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_SM3_SHIFT, 4, 0), 230 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_SHA3_SHIFT, 4, 0), 231 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_RDM_SHIFT, 4, 0), 232 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_ATOMIC_SHIFT, 4, 0), 233 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_CRC32_SHIFT, 4, 0), 234 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_SHA2_SHIFT, 4, 0), 235 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_SHA1_SHIFT, 4, 0), 236 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_AES_SHIFT, 4, 0), 237 ARM64_FTR_END, 238 }; 239 240 static const struct arm64_ftr_bits ftr_id_aa64isar1[] = { 241 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_XS_SHIFT, 4, 0), 242 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_I8MM_SHIFT, 4, 0), 243 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_DGH_SHIFT, 4, 0), 244 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_BF16_SHIFT, 4, 0), 245 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_SPECRES_SHIFT, 4, 0), 246 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_SB_SHIFT, 4, 0), 247 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_FRINTTS_SHIFT, 4, 0), 248 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), 249 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_GPI_SHIFT, 4, 0), 250 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), 251 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_GPA_SHIFT, 4, 0), 252 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_LRCPC_SHIFT, 4, 0), 253 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_FCMA_SHIFT, 4, 0), 254 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_JSCVT_SHIFT, 4, 0), 255 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), 256 FTR_STRICT, FTR_EXACT, ID_AA64ISAR1_EL1_API_SHIFT, 4, 0), 257 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), 258 FTR_STRICT, FTR_EXACT, ID_AA64ISAR1_EL1_APA_SHIFT, 4, 0), 259 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_DPB_SHIFT, 4, 0), 260 ARM64_FTR_END, 261 }; 262 263 static const struct arm64_ftr_bits ftr_id_aa64isar2[] = { 264 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_LUT_SHIFT, 4, 0), 265 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_CSSC_SHIFT, 4, 0), 266 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_RPRFM_SHIFT, 4, 0), 267 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_CLRBHB_SHIFT, 4, 0), 268 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_BC_SHIFT, 4, 0), 269 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_MOPS_SHIFT, 4, 0), 270 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), 271 FTR_STRICT, FTR_EXACT, ID_AA64ISAR2_EL1_APA3_SHIFT, 4, 0), 272 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), 273 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_GPA3_SHIFT, 4, 0), 274 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_RPRES_SHIFT, 4, 0), 275 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_WFxT_SHIFT, 4, 0), 276 ARM64_FTR_END, 277 }; 278 279 static const struct arm64_ftr_bits ftr_id_aa64isar3[] = { 280 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR3_EL1_FPRCVT_SHIFT, 4, 0), 281 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR3_EL1_FAMINMAX_SHIFT, 4, 0), 282 ARM64_FTR_END, 283 }; 284 285 static const struct arm64_ftr_bits ftr_id_aa64pfr0[] = { 286 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_CSV3_SHIFT, 4, 0), 287 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_CSV2_SHIFT, 4, 0), 288 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_DIT_SHIFT, 4, 0), 289 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_AMU_SHIFT, 4, 0), 290 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_MPAM_SHIFT, 4, 0), 291 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_SEL2_SHIFT, 4, 0), 292 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 293 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_SVE_SHIFT, 4, 0), 294 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_RAS_SHIFT, 4, 0), 295 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_GIC_SHIFT, 4, 0), 296 S_ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_AdvSIMD_SHIFT, 4, ID_AA64PFR0_EL1_AdvSIMD_NI), 297 S_ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_FP_SHIFT, 4, ID_AA64PFR0_EL1_FP_NI), 298 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_EL3_SHIFT, 4, 0), 299 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_EL2_SHIFT, 4, 0), 300 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_EL1_SHIFT, 4, ID_AA64PFR0_EL1_EL1_IMP), 301 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_EL0_SHIFT, 4, ID_AA64PFR0_EL1_EL0_IMP), 302 ARM64_FTR_END, 303 }; 304 305 static const struct arm64_ftr_bits ftr_id_aa64pfr1[] = { 306 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_GCS), 307 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_EL1_GCS_SHIFT, 4, 0), 308 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_EL1_MTE_frac_SHIFT, 4, 0), 309 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 310 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_EL1_SME_SHIFT, 4, 0), 311 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_EL1_MPAM_frac_SHIFT, 4, 0), 312 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_EL1_RAS_frac_SHIFT, 4, 0), 313 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_MTE), 314 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_EL1_MTE_SHIFT, 4, ID_AA64PFR1_EL1_MTE_NI), 315 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR1_EL1_SSBS_SHIFT, 4, ID_AA64PFR1_EL1_SSBS_NI), 316 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_BTI), 317 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_EL1_BT_SHIFT, 4, 0), 318 ARM64_FTR_END, 319 }; 320 321 static const struct arm64_ftr_bits ftr_id_aa64pfr2[] = { 322 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR2_EL1_FPMR_SHIFT, 4, 0), 323 ARM64_FTR_END, 324 }; 325 326 static const struct arm64_ftr_bits ftr_id_aa64zfr0[] = { 327 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 328 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_F64MM_SHIFT, 4, 0), 329 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 330 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_F32MM_SHIFT, 4, 0), 331 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 332 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_F16MM_SHIFT, 4, 0), 333 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 334 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_I8MM_SHIFT, 4, 0), 335 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 336 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_SM4_SHIFT, 4, 0), 337 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 338 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_SHA3_SHIFT, 4, 0), 339 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 340 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_B16B16_SHIFT, 4, 0), 341 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 342 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_BF16_SHIFT, 4, 0), 343 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 344 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_BitPerm_SHIFT, 4, 0), 345 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 346 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_EltPerm_SHIFT, 4, 0), 347 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 348 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_AES_SHIFT, 4, 0), 349 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 350 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_SVEver_SHIFT, 4, 0), 351 ARM64_FTR_END, 352 }; 353 354 static const struct arm64_ftr_bits ftr_id_aa64smfr0[] = { 355 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 356 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_FA64_SHIFT, 1, 0), 357 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 358 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_LUTv2_SHIFT, 1, 0), 359 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 360 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_SMEver_SHIFT, 4, 0), 361 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 362 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_I16I64_SHIFT, 4, 0), 363 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 364 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_F64F64_SHIFT, 1, 0), 365 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 366 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_I16I32_SHIFT, 4, 0), 367 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 368 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_B16B16_SHIFT, 1, 0), 369 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 370 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_F16F16_SHIFT, 1, 0), 371 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 372 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_F8F16_SHIFT, 1, 0), 373 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 374 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_F8F32_SHIFT, 1, 0), 375 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 376 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_I8I32_SHIFT, 4, 0), 377 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 378 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_F16F32_SHIFT, 1, 0), 379 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 380 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_B16F32_SHIFT, 1, 0), 381 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 382 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_BI32I32_SHIFT, 1, 0), 383 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 384 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_F32F32_SHIFT, 1, 0), 385 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 386 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_SF8FMA_SHIFT, 1, 0), 387 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 388 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_SF8DP4_SHIFT, 1, 0), 389 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 390 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_SF8DP2_SHIFT, 1, 0), 391 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 392 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_SBitPerm_SHIFT, 1, 0), 393 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 394 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_AES_SHIFT, 1, 0), 395 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 396 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_SFEXPA_SHIFT, 1, 0), 397 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 398 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_STMOP_SHIFT, 1, 0), 399 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 400 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_SMOP4_SHIFT, 1, 0), 401 ARM64_FTR_END, 402 }; 403 404 static const struct arm64_ftr_bits ftr_id_aa64fpfr0[] = { 405 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8CVT_SHIFT, 1, 0), 406 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8FMA_SHIFT, 1, 0), 407 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8DP4_SHIFT, 1, 0), 408 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8DP2_SHIFT, 1, 0), 409 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8MM8_SHIFT, 1, 0), 410 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8MM4_SHIFT, 1, 0), 411 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8E4M3_SHIFT, 1, 0), 412 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8E5M2_SHIFT, 1, 0), 413 ARM64_FTR_END, 414 }; 415 416 static const struct arm64_ftr_bits ftr_id_aa64mmfr0[] = { 417 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_ECV_SHIFT, 4, 0), 418 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_FGT_SHIFT, 4, 0), 419 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_EXS_SHIFT, 4, 0), 420 /* 421 * Page size not being supported at Stage-2 is not fatal. You 422 * just give up KVM if PAGE_SIZE isn't supported there. Go fix 423 * your favourite nesting hypervisor. 424 * 425 * There is a small corner case where the hypervisor explicitly 426 * advertises a given granule size at Stage-2 (value 2) on some 427 * vCPUs, and uses the fallback to Stage-1 (value 0) for other 428 * vCPUs. Although this is not forbidden by the architecture, it 429 * indicates that the hypervisor is being silly (or buggy). 430 * 431 * We make no effort to cope with this and pretend that if these 432 * fields are inconsistent across vCPUs, then it isn't worth 433 * trying to bring KVM up. 434 */ 435 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64MMFR0_EL1_TGRAN4_2_SHIFT, 4, 1), 436 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64MMFR0_EL1_TGRAN64_2_SHIFT, 4, 1), 437 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64MMFR0_EL1_TGRAN16_2_SHIFT, 4, 1), 438 /* 439 * We already refuse to boot CPUs that don't support our configured 440 * page size, so we can only detect mismatches for a page size other 441 * than the one we're currently using. Unfortunately, SoCs like this 442 * exist in the wild so, even though we don't like it, we'll have to go 443 * along with it and treat them as non-strict. 444 */ 445 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_TGRAN4_SHIFT, 4, ID_AA64MMFR0_EL1_TGRAN4_NI), 446 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_TGRAN64_SHIFT, 4, ID_AA64MMFR0_EL1_TGRAN64_NI), 447 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_TGRAN16_SHIFT, 4, ID_AA64MMFR0_EL1_TGRAN16_NI), 448 449 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_BIGENDEL0_SHIFT, 4, 0), 450 /* Linux shouldn't care about secure memory */ 451 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_SNSMEM_SHIFT, 4, 0), 452 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_BIGEND_SHIFT, 4, 0), 453 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_ASIDBITS_SHIFT, 4, 0), 454 /* 455 * Differing PARange is fine as long as all peripherals and memory are mapped 456 * within the minimum PARange of all CPUs 457 */ 458 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EL1_PARANGE_SHIFT, 4, 0), 459 ARM64_FTR_END, 460 }; 461 462 static const struct arm64_ftr_bits ftr_id_aa64mmfr1[] = { 463 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_ECBHB_SHIFT, 4, 0), 464 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_TIDCP1_SHIFT, 4, 0), 465 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_AFP_SHIFT, 4, 0), 466 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_HCX_SHIFT, 4, 0), 467 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_ETS_SHIFT, 4, 0), 468 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_TWED_SHIFT, 4, 0), 469 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_XNX_SHIFT, 4, 0), 470 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_HIGHER_SAFE, ID_AA64MMFR1_EL1_SpecSEI_SHIFT, 4, 0), 471 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_PAN_SHIFT, 4, 0), 472 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_LO_SHIFT, 4, 0), 473 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_HPDS_SHIFT, 4, 0), 474 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_VH_SHIFT, 4, 0), 475 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_VMIDBits_SHIFT, 4, 0), 476 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_HAFDBS_SHIFT, 4, 0), 477 ARM64_FTR_END, 478 }; 479 480 static const struct arm64_ftr_bits ftr_id_aa64mmfr2[] = { 481 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_E0PD_SHIFT, 4, 0), 482 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_EVT_SHIFT, 4, 0), 483 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_BBM_SHIFT, 4, 0), 484 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_TTL_SHIFT, 4, 0), 485 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_FWB_SHIFT, 4, 0), 486 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_IDS_SHIFT, 4, 0), 487 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_AT_SHIFT, 4, 0), 488 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_ST_SHIFT, 4, 0), 489 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_NV_SHIFT, 4, 0), 490 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_CCIDX_SHIFT, 4, 0), 491 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_VARange_SHIFT, 4, 0), 492 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_IESB_SHIFT, 4, 0), 493 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_LSM_SHIFT, 4, 0), 494 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_UAO_SHIFT, 4, 0), 495 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EL1_CnP_SHIFT, 4, 0), 496 ARM64_FTR_END, 497 }; 498 499 static const struct arm64_ftr_bits ftr_id_aa64mmfr3[] = { 500 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_POE), 501 FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR3_EL1_S1POE_SHIFT, 4, 0), 502 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR3_EL1_S1PIE_SHIFT, 4, 0), 503 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR3_EL1_TCRX_SHIFT, 4, 0), 504 ARM64_FTR_END, 505 }; 506 507 static const struct arm64_ftr_bits ftr_id_aa64mmfr4[] = { 508 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR4_EL1_E2H0_SHIFT, 4, 0), 509 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR4_EL1_NV_frac_SHIFT, 4, 0), 510 ARM64_FTR_END, 511 }; 512 513 static const struct arm64_ftr_bits ftr_ctr[] = { 514 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, 31, 1, 1), /* RES1 */ 515 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_EL0_DIC_SHIFT, 1, 1), 516 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_EL0_IDC_SHIFT, 1, 1), 517 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_HIGHER_OR_ZERO_SAFE, CTR_EL0_CWG_SHIFT, 4, 0), 518 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_HIGHER_OR_ZERO_SAFE, CTR_EL0_ERG_SHIFT, 4, 0), 519 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_EL0_DminLine_SHIFT, 4, 1), 520 /* 521 * Linux can handle differing I-cache policies. Userspace JITs will 522 * make use of *minLine. 523 * If we have differing I-cache policies, report it as the weakest - VIPT. 524 */ 525 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_EXACT, CTR_EL0_L1Ip_SHIFT, 2, CTR_EL0_L1Ip_VIPT), /* L1Ip */ 526 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_EL0_IminLine_SHIFT, 4, 0), 527 ARM64_FTR_END, 528 }; 529 530 static struct arm64_ftr_override __ro_after_init no_override = { }; 531 532 struct arm64_ftr_reg arm64_ftr_reg_ctrel0 = { 533 .name = "SYS_CTR_EL0", 534 .ftr_bits = ftr_ctr, 535 .override = &no_override, 536 }; 537 538 static const struct arm64_ftr_bits ftr_id_mmfr0[] = { 539 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_EL1_InnerShr_SHIFT, 4, 0xf), 540 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_EL1_FCSE_SHIFT, 4, 0), 541 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_MMFR0_EL1_AuxReg_SHIFT, 4, 0), 542 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_EL1_TCM_SHIFT, 4, 0), 543 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_EL1_ShareLvl_SHIFT, 4, 0), 544 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_EL1_OuterShr_SHIFT, 4, 0xf), 545 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_EL1_PMSA_SHIFT, 4, 0), 546 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_EL1_VMSA_SHIFT, 4, 0), 547 ARM64_FTR_END, 548 }; 549 550 static const struct arm64_ftr_bits ftr_id_aa64dfr0[] = { 551 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_EL1_DoubleLock_SHIFT, 4, 0), 552 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64DFR0_EL1_PMSVer_SHIFT, 4, 0), 553 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_EL1_CTX_CMPs_SHIFT, 4, 0), 554 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_EL1_WRPs_SHIFT, 4, 0), 555 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_EL1_BRPs_SHIFT, 4, 0), 556 /* 557 * We can instantiate multiple PMU instances with different levels 558 * of support. 559 */ 560 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64DFR0_EL1_PMUVer_SHIFT, 4, 0), 561 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, ID_AA64DFR0_EL1_DebugVer_SHIFT, 4, 0x6), 562 ARM64_FTR_END, 563 }; 564 565 static const struct arm64_ftr_bits ftr_mvfr0[] = { 566 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR0_EL1_FPRound_SHIFT, 4, 0), 567 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR0_EL1_FPShVec_SHIFT, 4, 0), 568 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR0_EL1_FPSqrt_SHIFT, 4, 0), 569 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR0_EL1_FPDivide_SHIFT, 4, 0), 570 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR0_EL1_FPTrap_SHIFT, 4, 0), 571 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, MVFR0_EL1_FPDP_SHIFT, 4, 0), 572 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR0_EL1_FPSP_SHIFT, 4, 0), 573 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR0_EL1_SIMDReg_SHIFT, 4, 0), 574 ARM64_FTR_END, 575 }; 576 577 static const struct arm64_ftr_bits ftr_mvfr1[] = { 578 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, MVFR1_EL1_SIMDFMAC_SHIFT, 4, 0), 579 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, MVFR1_EL1_FPHP_SHIFT, 4, 0), 580 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, MVFR1_EL1_SIMDHP_SHIFT, 4, 0), 581 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, MVFR1_EL1_SIMDSP_SHIFT, 4, 0), 582 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, MVFR1_EL1_SIMDInt_SHIFT, 4, 0), 583 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, MVFR1_EL1_SIMDLS_SHIFT, 4, 0), 584 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR1_EL1_FPDNaN_SHIFT, 4, 0), 585 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR1_EL1_FPFtZ_SHIFT, 4, 0), 586 ARM64_FTR_END, 587 }; 588 589 static const struct arm64_ftr_bits ftr_mvfr2[] = { 590 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR2_EL1_FPMisc_SHIFT, 4, 0), 591 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR2_EL1_SIMDMisc_SHIFT, 4, 0), 592 ARM64_FTR_END, 593 }; 594 595 static const struct arm64_ftr_bits ftr_dczid[] = { 596 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, DCZID_EL0_DZP_SHIFT, 1, 1), 597 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, DCZID_EL0_BS_SHIFT, 4, 0), 598 ARM64_FTR_END, 599 }; 600 601 static const struct arm64_ftr_bits ftr_gmid[] = { 602 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, GMID_EL1_BS_SHIFT, 4, 0), 603 ARM64_FTR_END, 604 }; 605 606 static const struct arm64_ftr_bits ftr_id_isar0[] = { 607 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_EL1_Divide_SHIFT, 4, 0), 608 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_EL1_Debug_SHIFT, 4, 0), 609 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_EL1_Coproc_SHIFT, 4, 0), 610 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_EL1_CmpBranch_SHIFT, 4, 0), 611 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_EL1_BitField_SHIFT, 4, 0), 612 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_EL1_BitCount_SHIFT, 4, 0), 613 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_EL1_Swap_SHIFT, 4, 0), 614 ARM64_FTR_END, 615 }; 616 617 static const struct arm64_ftr_bits ftr_id_isar5[] = { 618 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_EL1_RDM_SHIFT, 4, 0), 619 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_EL1_CRC32_SHIFT, 4, 0), 620 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_EL1_SHA2_SHIFT, 4, 0), 621 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_EL1_SHA1_SHIFT, 4, 0), 622 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_EL1_AES_SHIFT, 4, 0), 623 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_EL1_SEVL_SHIFT, 4, 0), 624 ARM64_FTR_END, 625 }; 626 627 static const struct arm64_ftr_bits ftr_id_mmfr4[] = { 628 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_EL1_EVT_SHIFT, 4, 0), 629 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_EL1_CCIDX_SHIFT, 4, 0), 630 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_EL1_LSM_SHIFT, 4, 0), 631 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_EL1_HPDS_SHIFT, 4, 0), 632 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_EL1_CnP_SHIFT, 4, 0), 633 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_EL1_XNX_SHIFT, 4, 0), 634 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_EL1_AC2_SHIFT, 4, 0), 635 636 /* 637 * SpecSEI = 1 indicates that the PE might generate an SError on an 638 * external abort on speculative read. It is safe to assume that an 639 * SError might be generated than it will not be. Hence it has been 640 * classified as FTR_HIGHER_SAFE. 641 */ 642 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_HIGHER_SAFE, ID_MMFR4_EL1_SpecSEI_SHIFT, 4, 0), 643 ARM64_FTR_END, 644 }; 645 646 static const struct arm64_ftr_bits ftr_id_isar4[] = { 647 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_EL1_SWP_frac_SHIFT, 4, 0), 648 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_EL1_PSR_M_SHIFT, 4, 0), 649 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_EL1_SynchPrim_frac_SHIFT, 4, 0), 650 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_EL1_Barrier_SHIFT, 4, 0), 651 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_EL1_SMC_SHIFT, 4, 0), 652 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_EL1_Writeback_SHIFT, 4, 0), 653 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_EL1_WithShifts_SHIFT, 4, 0), 654 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_EL1_Unpriv_SHIFT, 4, 0), 655 ARM64_FTR_END, 656 }; 657 658 static const struct arm64_ftr_bits ftr_id_mmfr5[] = { 659 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR5_EL1_ETS_SHIFT, 4, 0), 660 ARM64_FTR_END, 661 }; 662 663 static const struct arm64_ftr_bits ftr_id_isar6[] = { 664 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_I8MM_SHIFT, 4, 0), 665 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_BF16_SHIFT, 4, 0), 666 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_SPECRES_SHIFT, 4, 0), 667 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_SB_SHIFT, 4, 0), 668 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_FHM_SHIFT, 4, 0), 669 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_DP_SHIFT, 4, 0), 670 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_JSCVT_SHIFT, 4, 0), 671 ARM64_FTR_END, 672 }; 673 674 static const struct arm64_ftr_bits ftr_id_pfr0[] = { 675 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_EL1_DIT_SHIFT, 4, 0), 676 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_PFR0_EL1_CSV2_SHIFT, 4, 0), 677 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_EL1_State3_SHIFT, 4, 0), 678 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_EL1_State2_SHIFT, 4, 0), 679 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_EL1_State1_SHIFT, 4, 0), 680 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_EL1_State0_SHIFT, 4, 0), 681 ARM64_FTR_END, 682 }; 683 684 static const struct arm64_ftr_bits ftr_id_pfr1[] = { 685 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_EL1_GIC_SHIFT, 4, 0), 686 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_EL1_Virt_frac_SHIFT, 4, 0), 687 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_EL1_Sec_frac_SHIFT, 4, 0), 688 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_EL1_GenTimer_SHIFT, 4, 0), 689 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_EL1_Virtualization_SHIFT, 4, 0), 690 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_EL1_MProgMod_SHIFT, 4, 0), 691 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_EL1_Security_SHIFT, 4, 0), 692 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_EL1_ProgMod_SHIFT, 4, 0), 693 ARM64_FTR_END, 694 }; 695 696 static const struct arm64_ftr_bits ftr_id_pfr2[] = { 697 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_PFR2_EL1_SSBS_SHIFT, 4, 0), 698 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_PFR2_EL1_CSV3_SHIFT, 4, 0), 699 ARM64_FTR_END, 700 }; 701 702 static const struct arm64_ftr_bits ftr_id_dfr0[] = { 703 /* [31:28] TraceFilt */ 704 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_DFR0_EL1_PerfMon_SHIFT, 4, 0), 705 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_EL1_MProfDbg_SHIFT, 4, 0), 706 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_EL1_MMapTrc_SHIFT, 4, 0), 707 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_EL1_CopTrc_SHIFT, 4, 0), 708 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_EL1_MMapDbg_SHIFT, 4, 0), 709 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_EL1_CopSDbg_SHIFT, 4, 0), 710 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_EL1_CopDbg_SHIFT, 4, 0), 711 ARM64_FTR_END, 712 }; 713 714 static const struct arm64_ftr_bits ftr_id_dfr1[] = { 715 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR1_EL1_MTPMU_SHIFT, 4, 0), 716 ARM64_FTR_END, 717 }; 718 719 static const struct arm64_ftr_bits ftr_mpamidr[] = { 720 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, MPAMIDR_EL1_PMG_MAX_SHIFT, MPAMIDR_EL1_PMG_MAX_WIDTH, 0), 721 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, MPAMIDR_EL1_VPMR_MAX_SHIFT, MPAMIDR_EL1_VPMR_MAX_WIDTH, 0), 722 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MPAMIDR_EL1_HAS_HCR_SHIFT, 1, 0), 723 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, MPAMIDR_EL1_PARTID_MAX_SHIFT, MPAMIDR_EL1_PARTID_MAX_WIDTH, 0), 724 ARM64_FTR_END, 725 }; 726 727 /* 728 * Common ftr bits for a 32bit register with all hidden, strict 729 * attributes, with 4bit feature fields and a default safe value of 730 * 0. Covers the following 32bit registers: 731 * id_isar[1-3], id_mmfr[1-3] 732 */ 733 static const struct arm64_ftr_bits ftr_generic_32bits[] = { 734 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 28, 4, 0), 735 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 24, 4, 0), 736 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 20, 4, 0), 737 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 16, 4, 0), 738 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 12, 4, 0), 739 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 8, 4, 0), 740 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0), 741 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), 742 ARM64_FTR_END, 743 }; 744 745 /* Table for a single 32bit feature value */ 746 static const struct arm64_ftr_bits ftr_single32[] = { 747 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, 0, 32, 0), 748 ARM64_FTR_END, 749 }; 750 751 static const struct arm64_ftr_bits ftr_raz[] = { 752 ARM64_FTR_END, 753 }; 754 755 #define __ARM64_FTR_REG_OVERRIDE(id_str, id, table, ovr) { \ 756 .sys_id = id, \ 757 .reg = &(struct arm64_ftr_reg){ \ 758 .name = id_str, \ 759 .override = (ovr), \ 760 .ftr_bits = &((table)[0]), \ 761 }} 762 763 #define ARM64_FTR_REG_OVERRIDE(id, table, ovr) \ 764 __ARM64_FTR_REG_OVERRIDE(#id, id, table, ovr) 765 766 #define ARM64_FTR_REG(id, table) \ 767 __ARM64_FTR_REG_OVERRIDE(#id, id, table, &no_override) 768 769 struct arm64_ftr_override id_aa64mmfr0_override; 770 struct arm64_ftr_override id_aa64mmfr1_override; 771 struct arm64_ftr_override id_aa64mmfr2_override; 772 struct arm64_ftr_override id_aa64pfr0_override; 773 struct arm64_ftr_override id_aa64pfr1_override; 774 struct arm64_ftr_override id_aa64zfr0_override; 775 struct arm64_ftr_override id_aa64smfr0_override; 776 struct arm64_ftr_override id_aa64isar1_override; 777 struct arm64_ftr_override id_aa64isar2_override; 778 779 struct arm64_ftr_override arm64_sw_feature_override; 780 781 static const struct __ftr_reg_entry { 782 u32 sys_id; 783 struct arm64_ftr_reg *reg; 784 } arm64_ftr_regs[] = { 785 786 /* Op1 = 0, CRn = 0, CRm = 1 */ 787 ARM64_FTR_REG(SYS_ID_PFR0_EL1, ftr_id_pfr0), 788 ARM64_FTR_REG(SYS_ID_PFR1_EL1, ftr_id_pfr1), 789 ARM64_FTR_REG(SYS_ID_DFR0_EL1, ftr_id_dfr0), 790 ARM64_FTR_REG(SYS_ID_MMFR0_EL1, ftr_id_mmfr0), 791 ARM64_FTR_REG(SYS_ID_MMFR1_EL1, ftr_generic_32bits), 792 ARM64_FTR_REG(SYS_ID_MMFR2_EL1, ftr_generic_32bits), 793 ARM64_FTR_REG(SYS_ID_MMFR3_EL1, ftr_generic_32bits), 794 795 /* Op1 = 0, CRn = 0, CRm = 2 */ 796 ARM64_FTR_REG(SYS_ID_ISAR0_EL1, ftr_id_isar0), 797 ARM64_FTR_REG(SYS_ID_ISAR1_EL1, ftr_generic_32bits), 798 ARM64_FTR_REG(SYS_ID_ISAR2_EL1, ftr_generic_32bits), 799 ARM64_FTR_REG(SYS_ID_ISAR3_EL1, ftr_generic_32bits), 800 ARM64_FTR_REG(SYS_ID_ISAR4_EL1, ftr_id_isar4), 801 ARM64_FTR_REG(SYS_ID_ISAR5_EL1, ftr_id_isar5), 802 ARM64_FTR_REG(SYS_ID_MMFR4_EL1, ftr_id_mmfr4), 803 ARM64_FTR_REG(SYS_ID_ISAR6_EL1, ftr_id_isar6), 804 805 /* Op1 = 0, CRn = 0, CRm = 3 */ 806 ARM64_FTR_REG(SYS_MVFR0_EL1, ftr_mvfr0), 807 ARM64_FTR_REG(SYS_MVFR1_EL1, ftr_mvfr1), 808 ARM64_FTR_REG(SYS_MVFR2_EL1, ftr_mvfr2), 809 ARM64_FTR_REG(SYS_ID_PFR2_EL1, ftr_id_pfr2), 810 ARM64_FTR_REG(SYS_ID_DFR1_EL1, ftr_id_dfr1), 811 ARM64_FTR_REG(SYS_ID_MMFR5_EL1, ftr_id_mmfr5), 812 813 /* Op1 = 0, CRn = 0, CRm = 4 */ 814 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64PFR0_EL1, ftr_id_aa64pfr0, 815 &id_aa64pfr0_override), 816 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64PFR1_EL1, ftr_id_aa64pfr1, 817 &id_aa64pfr1_override), 818 ARM64_FTR_REG(SYS_ID_AA64PFR2_EL1, ftr_id_aa64pfr2), 819 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64ZFR0_EL1, ftr_id_aa64zfr0, 820 &id_aa64zfr0_override), 821 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64SMFR0_EL1, ftr_id_aa64smfr0, 822 &id_aa64smfr0_override), 823 ARM64_FTR_REG(SYS_ID_AA64FPFR0_EL1, ftr_id_aa64fpfr0), 824 825 /* Op1 = 0, CRn = 0, CRm = 5 */ 826 ARM64_FTR_REG(SYS_ID_AA64DFR0_EL1, ftr_id_aa64dfr0), 827 ARM64_FTR_REG(SYS_ID_AA64DFR1_EL1, ftr_raz), 828 829 /* Op1 = 0, CRn = 0, CRm = 6 */ 830 ARM64_FTR_REG(SYS_ID_AA64ISAR0_EL1, ftr_id_aa64isar0), 831 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64ISAR1_EL1, ftr_id_aa64isar1, 832 &id_aa64isar1_override), 833 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64ISAR2_EL1, ftr_id_aa64isar2, 834 &id_aa64isar2_override), 835 ARM64_FTR_REG(SYS_ID_AA64ISAR3_EL1, ftr_id_aa64isar3), 836 837 /* Op1 = 0, CRn = 0, CRm = 7 */ 838 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64MMFR0_EL1, ftr_id_aa64mmfr0, 839 &id_aa64mmfr0_override), 840 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64MMFR1_EL1, ftr_id_aa64mmfr1, 841 &id_aa64mmfr1_override), 842 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64MMFR2_EL1, ftr_id_aa64mmfr2, 843 &id_aa64mmfr2_override), 844 ARM64_FTR_REG(SYS_ID_AA64MMFR3_EL1, ftr_id_aa64mmfr3), 845 ARM64_FTR_REG(SYS_ID_AA64MMFR4_EL1, ftr_id_aa64mmfr4), 846 847 /* Op1 = 0, CRn = 10, CRm = 4 */ 848 ARM64_FTR_REG(SYS_MPAMIDR_EL1, ftr_mpamidr), 849 850 /* Op1 = 1, CRn = 0, CRm = 0 */ 851 ARM64_FTR_REG(SYS_GMID_EL1, ftr_gmid), 852 853 /* Op1 = 3, CRn = 0, CRm = 0 */ 854 { SYS_CTR_EL0, &arm64_ftr_reg_ctrel0 }, 855 ARM64_FTR_REG(SYS_DCZID_EL0, ftr_dczid), 856 857 /* Op1 = 3, CRn = 14, CRm = 0 */ 858 ARM64_FTR_REG(SYS_CNTFRQ_EL0, ftr_single32), 859 }; 860 861 static int search_cmp_ftr_reg(const void *id, const void *regp) 862 { 863 return (int)(unsigned long)id - (int)((const struct __ftr_reg_entry *)regp)->sys_id; 864 } 865 866 /* 867 * get_arm64_ftr_reg_nowarn - Looks up a feature register entry using 868 * its sys_reg() encoding. With the array arm64_ftr_regs sorted in the 869 * ascending order of sys_id, we use binary search to find a matching 870 * entry. 871 * 872 * returns - Upon success, matching ftr_reg entry for id. 873 * - NULL on failure. It is upto the caller to decide 874 * the impact of a failure. 875 */ 876 static struct arm64_ftr_reg *get_arm64_ftr_reg_nowarn(u32 sys_id) 877 { 878 const struct __ftr_reg_entry *ret; 879 880 ret = bsearch((const void *)(unsigned long)sys_id, 881 arm64_ftr_regs, 882 ARRAY_SIZE(arm64_ftr_regs), 883 sizeof(arm64_ftr_regs[0]), 884 search_cmp_ftr_reg); 885 if (ret) 886 return ret->reg; 887 return NULL; 888 } 889 890 /* 891 * get_arm64_ftr_reg - Looks up a feature register entry using 892 * its sys_reg() encoding. This calls get_arm64_ftr_reg_nowarn(). 893 * 894 * returns - Upon success, matching ftr_reg entry for id. 895 * - NULL on failure but with an WARN_ON(). 896 */ 897 struct arm64_ftr_reg *get_arm64_ftr_reg(u32 sys_id) 898 { 899 struct arm64_ftr_reg *reg; 900 901 reg = get_arm64_ftr_reg_nowarn(sys_id); 902 903 /* 904 * Requesting a non-existent register search is an error. Warn 905 * and let the caller handle it. 906 */ 907 WARN_ON(!reg); 908 return reg; 909 } 910 911 static u64 arm64_ftr_set_value(const struct arm64_ftr_bits *ftrp, s64 reg, 912 s64 ftr_val) 913 { 914 u64 mask = arm64_ftr_mask(ftrp); 915 916 reg &= ~mask; 917 reg |= (ftr_val << ftrp->shift) & mask; 918 return reg; 919 } 920 921 s64 arm64_ftr_safe_value(const struct arm64_ftr_bits *ftrp, s64 new, 922 s64 cur) 923 { 924 s64 ret = 0; 925 926 switch (ftrp->type) { 927 case FTR_EXACT: 928 ret = ftrp->safe_val; 929 break; 930 case FTR_LOWER_SAFE: 931 ret = min(new, cur); 932 break; 933 case FTR_HIGHER_OR_ZERO_SAFE: 934 if (!cur || !new) 935 break; 936 fallthrough; 937 case FTR_HIGHER_SAFE: 938 ret = max(new, cur); 939 break; 940 default: 941 BUG(); 942 } 943 944 return ret; 945 } 946 947 static void __init sort_ftr_regs(void) 948 { 949 unsigned int i; 950 951 for (i = 0; i < ARRAY_SIZE(arm64_ftr_regs); i++) { 952 const struct arm64_ftr_reg *ftr_reg = arm64_ftr_regs[i].reg; 953 const struct arm64_ftr_bits *ftr_bits = ftr_reg->ftr_bits; 954 unsigned int j = 0; 955 956 /* 957 * Features here must be sorted in descending order with respect 958 * to their shift values and should not overlap with each other. 959 */ 960 for (; ftr_bits->width != 0; ftr_bits++, j++) { 961 unsigned int width = ftr_reg->ftr_bits[j].width; 962 unsigned int shift = ftr_reg->ftr_bits[j].shift; 963 unsigned int prev_shift; 964 965 WARN((shift + width) > 64, 966 "%s has invalid feature at shift %d\n", 967 ftr_reg->name, shift); 968 969 /* 970 * Skip the first feature. There is nothing to 971 * compare against for now. 972 */ 973 if (j == 0) 974 continue; 975 976 prev_shift = ftr_reg->ftr_bits[j - 1].shift; 977 WARN((shift + width) > prev_shift, 978 "%s has feature overlap at shift %d\n", 979 ftr_reg->name, shift); 980 } 981 982 /* 983 * Skip the first register. There is nothing to 984 * compare against for now. 985 */ 986 if (i == 0) 987 continue; 988 /* 989 * Registers here must be sorted in ascending order with respect 990 * to sys_id for subsequent binary search in get_arm64_ftr_reg() 991 * to work correctly. 992 */ 993 BUG_ON(arm64_ftr_regs[i].sys_id <= arm64_ftr_regs[i - 1].sys_id); 994 } 995 } 996 997 /* 998 * Initialise the CPU feature register from Boot CPU values. 999 * Also initiliases the strict_mask for the register. 1000 * Any bits that are not covered by an arm64_ftr_bits entry are considered 1001 * RES0 for the system-wide value, and must strictly match. 1002 */ 1003 static void init_cpu_ftr_reg(u32 sys_reg, u64 new) 1004 { 1005 u64 val = 0; 1006 u64 strict_mask = ~0x0ULL; 1007 u64 user_mask = 0; 1008 u64 valid_mask = 0; 1009 1010 const struct arm64_ftr_bits *ftrp; 1011 struct arm64_ftr_reg *reg = get_arm64_ftr_reg(sys_reg); 1012 1013 if (!reg) 1014 return; 1015 1016 for (ftrp = reg->ftr_bits; ftrp->width; ftrp++) { 1017 u64 ftr_mask = arm64_ftr_mask(ftrp); 1018 s64 ftr_new = arm64_ftr_value(ftrp, new); 1019 s64 ftr_ovr = arm64_ftr_value(ftrp, reg->override->val); 1020 1021 if ((ftr_mask & reg->override->mask) == ftr_mask) { 1022 s64 tmp = arm64_ftr_safe_value(ftrp, ftr_ovr, ftr_new); 1023 char *str = NULL; 1024 1025 if (ftr_ovr != tmp) { 1026 /* Unsafe, remove the override */ 1027 reg->override->mask &= ~ftr_mask; 1028 reg->override->val &= ~ftr_mask; 1029 tmp = ftr_ovr; 1030 str = "ignoring override"; 1031 } else if (ftr_new != tmp) { 1032 /* Override was valid */ 1033 ftr_new = tmp; 1034 str = "forced"; 1035 } else { 1036 /* Override was the safe value */ 1037 str = "already set"; 1038 } 1039 1040 pr_warn("%s[%d:%d]: %s to %llx\n", 1041 reg->name, 1042 ftrp->shift + ftrp->width - 1, 1043 ftrp->shift, str, 1044 tmp & (BIT(ftrp->width) - 1)); 1045 } else if ((ftr_mask & reg->override->val) == ftr_mask) { 1046 reg->override->val &= ~ftr_mask; 1047 pr_warn("%s[%d:%d]: impossible override, ignored\n", 1048 reg->name, 1049 ftrp->shift + ftrp->width - 1, 1050 ftrp->shift); 1051 } 1052 1053 val = arm64_ftr_set_value(ftrp, val, ftr_new); 1054 1055 valid_mask |= ftr_mask; 1056 if (!ftrp->strict) 1057 strict_mask &= ~ftr_mask; 1058 if (ftrp->visible) 1059 user_mask |= ftr_mask; 1060 else 1061 reg->user_val = arm64_ftr_set_value(ftrp, 1062 reg->user_val, 1063 ftrp->safe_val); 1064 } 1065 1066 val &= valid_mask; 1067 1068 reg->sys_val = val; 1069 reg->strict_mask = strict_mask; 1070 reg->user_mask = user_mask; 1071 } 1072 1073 extern const struct arm64_cpu_capabilities arm64_errata[]; 1074 static const struct arm64_cpu_capabilities arm64_features[]; 1075 1076 static void __init 1077 init_cpucap_indirect_list_from_array(const struct arm64_cpu_capabilities *caps) 1078 { 1079 for (; caps->matches; caps++) { 1080 if (WARN(caps->capability >= ARM64_NCAPS, 1081 "Invalid capability %d\n", caps->capability)) 1082 continue; 1083 if (WARN(cpucap_ptrs[caps->capability], 1084 "Duplicate entry for capability %d\n", 1085 caps->capability)) 1086 continue; 1087 cpucap_ptrs[caps->capability] = caps; 1088 } 1089 } 1090 1091 static void __init init_cpucap_indirect_list(void) 1092 { 1093 init_cpucap_indirect_list_from_array(arm64_features); 1094 init_cpucap_indirect_list_from_array(arm64_errata); 1095 } 1096 1097 static void __init setup_boot_cpu_capabilities(void); 1098 1099 static void init_32bit_cpu_features(struct cpuinfo_32bit *info) 1100 { 1101 init_cpu_ftr_reg(SYS_ID_DFR0_EL1, info->reg_id_dfr0); 1102 init_cpu_ftr_reg(SYS_ID_DFR1_EL1, info->reg_id_dfr1); 1103 init_cpu_ftr_reg(SYS_ID_ISAR0_EL1, info->reg_id_isar0); 1104 init_cpu_ftr_reg(SYS_ID_ISAR1_EL1, info->reg_id_isar1); 1105 init_cpu_ftr_reg(SYS_ID_ISAR2_EL1, info->reg_id_isar2); 1106 init_cpu_ftr_reg(SYS_ID_ISAR3_EL1, info->reg_id_isar3); 1107 init_cpu_ftr_reg(SYS_ID_ISAR4_EL1, info->reg_id_isar4); 1108 init_cpu_ftr_reg(SYS_ID_ISAR5_EL1, info->reg_id_isar5); 1109 init_cpu_ftr_reg(SYS_ID_ISAR6_EL1, info->reg_id_isar6); 1110 init_cpu_ftr_reg(SYS_ID_MMFR0_EL1, info->reg_id_mmfr0); 1111 init_cpu_ftr_reg(SYS_ID_MMFR1_EL1, info->reg_id_mmfr1); 1112 init_cpu_ftr_reg(SYS_ID_MMFR2_EL1, info->reg_id_mmfr2); 1113 init_cpu_ftr_reg(SYS_ID_MMFR3_EL1, info->reg_id_mmfr3); 1114 init_cpu_ftr_reg(SYS_ID_MMFR4_EL1, info->reg_id_mmfr4); 1115 init_cpu_ftr_reg(SYS_ID_MMFR5_EL1, info->reg_id_mmfr5); 1116 init_cpu_ftr_reg(SYS_ID_PFR0_EL1, info->reg_id_pfr0); 1117 init_cpu_ftr_reg(SYS_ID_PFR1_EL1, info->reg_id_pfr1); 1118 init_cpu_ftr_reg(SYS_ID_PFR2_EL1, info->reg_id_pfr2); 1119 init_cpu_ftr_reg(SYS_MVFR0_EL1, info->reg_mvfr0); 1120 init_cpu_ftr_reg(SYS_MVFR1_EL1, info->reg_mvfr1); 1121 init_cpu_ftr_reg(SYS_MVFR2_EL1, info->reg_mvfr2); 1122 } 1123 1124 #ifdef CONFIG_ARM64_PSEUDO_NMI 1125 static bool enable_pseudo_nmi; 1126 1127 static int __init early_enable_pseudo_nmi(char *p) 1128 { 1129 return kstrtobool(p, &enable_pseudo_nmi); 1130 } 1131 early_param("irqchip.gicv3_pseudo_nmi", early_enable_pseudo_nmi); 1132 1133 static __init void detect_system_supports_pseudo_nmi(void) 1134 { 1135 struct device_node *np; 1136 1137 if (!enable_pseudo_nmi) 1138 return; 1139 1140 /* 1141 * Detect broken MediaTek firmware that doesn't properly save and 1142 * restore GIC priorities. 1143 */ 1144 np = of_find_compatible_node(NULL, NULL, "arm,gic-v3"); 1145 if (np && of_property_read_bool(np, "mediatek,broken-save-restore-fw")) { 1146 pr_info("Pseudo-NMI disabled due to MediaTek Chromebook GICR save problem\n"); 1147 enable_pseudo_nmi = false; 1148 } 1149 of_node_put(np); 1150 } 1151 #else /* CONFIG_ARM64_PSEUDO_NMI */ 1152 static inline void detect_system_supports_pseudo_nmi(void) { } 1153 #endif 1154 1155 void __init init_cpu_features(struct cpuinfo_arm64 *info) 1156 { 1157 /* Before we start using the tables, make sure it is sorted */ 1158 sort_ftr_regs(); 1159 1160 init_cpu_ftr_reg(SYS_CTR_EL0, info->reg_ctr); 1161 init_cpu_ftr_reg(SYS_DCZID_EL0, info->reg_dczid); 1162 init_cpu_ftr_reg(SYS_CNTFRQ_EL0, info->reg_cntfrq); 1163 init_cpu_ftr_reg(SYS_ID_AA64DFR0_EL1, info->reg_id_aa64dfr0); 1164 init_cpu_ftr_reg(SYS_ID_AA64DFR1_EL1, info->reg_id_aa64dfr1); 1165 init_cpu_ftr_reg(SYS_ID_AA64ISAR0_EL1, info->reg_id_aa64isar0); 1166 init_cpu_ftr_reg(SYS_ID_AA64ISAR1_EL1, info->reg_id_aa64isar1); 1167 init_cpu_ftr_reg(SYS_ID_AA64ISAR2_EL1, info->reg_id_aa64isar2); 1168 init_cpu_ftr_reg(SYS_ID_AA64ISAR3_EL1, info->reg_id_aa64isar3); 1169 init_cpu_ftr_reg(SYS_ID_AA64MMFR0_EL1, info->reg_id_aa64mmfr0); 1170 init_cpu_ftr_reg(SYS_ID_AA64MMFR1_EL1, info->reg_id_aa64mmfr1); 1171 init_cpu_ftr_reg(SYS_ID_AA64MMFR2_EL1, info->reg_id_aa64mmfr2); 1172 init_cpu_ftr_reg(SYS_ID_AA64MMFR3_EL1, info->reg_id_aa64mmfr3); 1173 init_cpu_ftr_reg(SYS_ID_AA64MMFR4_EL1, info->reg_id_aa64mmfr4); 1174 init_cpu_ftr_reg(SYS_ID_AA64PFR0_EL1, info->reg_id_aa64pfr0); 1175 init_cpu_ftr_reg(SYS_ID_AA64PFR1_EL1, info->reg_id_aa64pfr1); 1176 init_cpu_ftr_reg(SYS_ID_AA64PFR2_EL1, info->reg_id_aa64pfr2); 1177 init_cpu_ftr_reg(SYS_ID_AA64ZFR0_EL1, info->reg_id_aa64zfr0); 1178 init_cpu_ftr_reg(SYS_ID_AA64SMFR0_EL1, info->reg_id_aa64smfr0); 1179 init_cpu_ftr_reg(SYS_ID_AA64FPFR0_EL1, info->reg_id_aa64fpfr0); 1180 1181 if (id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0)) 1182 init_32bit_cpu_features(&info->aarch32); 1183 1184 if (IS_ENABLED(CONFIG_ARM64_SVE) && 1185 id_aa64pfr0_sve(read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1))) { 1186 unsigned long cpacr = cpacr_save_enable_kernel_sve(); 1187 1188 vec_init_vq_map(ARM64_VEC_SVE); 1189 1190 cpacr_restore(cpacr); 1191 } 1192 1193 if (IS_ENABLED(CONFIG_ARM64_SME) && 1194 id_aa64pfr1_sme(read_sanitised_ftr_reg(SYS_ID_AA64PFR1_EL1))) { 1195 unsigned long cpacr = cpacr_save_enable_kernel_sme(); 1196 1197 vec_init_vq_map(ARM64_VEC_SME); 1198 1199 cpacr_restore(cpacr); 1200 } 1201 1202 if (id_aa64pfr0_mpam(info->reg_id_aa64pfr0)) 1203 init_cpu_ftr_reg(SYS_MPAMIDR_EL1, info->reg_mpamidr); 1204 1205 if (id_aa64pfr1_mte(info->reg_id_aa64pfr1)) 1206 init_cpu_ftr_reg(SYS_GMID_EL1, info->reg_gmid); 1207 } 1208 1209 static void update_cpu_ftr_reg(struct arm64_ftr_reg *reg, u64 new) 1210 { 1211 const struct arm64_ftr_bits *ftrp; 1212 1213 for (ftrp = reg->ftr_bits; ftrp->width; ftrp++) { 1214 s64 ftr_cur = arm64_ftr_value(ftrp, reg->sys_val); 1215 s64 ftr_new = arm64_ftr_value(ftrp, new); 1216 1217 if (ftr_cur == ftr_new) 1218 continue; 1219 /* Find a safe value */ 1220 ftr_new = arm64_ftr_safe_value(ftrp, ftr_new, ftr_cur); 1221 reg->sys_val = arm64_ftr_set_value(ftrp, reg->sys_val, ftr_new); 1222 } 1223 1224 } 1225 1226 static int check_update_ftr_reg(u32 sys_id, int cpu, u64 val, u64 boot) 1227 { 1228 struct arm64_ftr_reg *regp = get_arm64_ftr_reg(sys_id); 1229 1230 if (!regp) 1231 return 0; 1232 1233 update_cpu_ftr_reg(regp, val); 1234 if ((boot & regp->strict_mask) == (val & regp->strict_mask)) 1235 return 0; 1236 pr_warn("SANITY CHECK: Unexpected variation in %s. Boot CPU: %#016llx, CPU%d: %#016llx\n", 1237 regp->name, boot, cpu, val); 1238 return 1; 1239 } 1240 1241 static void relax_cpu_ftr_reg(u32 sys_id, int field) 1242 { 1243 const struct arm64_ftr_bits *ftrp; 1244 struct arm64_ftr_reg *regp = get_arm64_ftr_reg(sys_id); 1245 1246 if (!regp) 1247 return; 1248 1249 for (ftrp = regp->ftr_bits; ftrp->width; ftrp++) { 1250 if (ftrp->shift == field) { 1251 regp->strict_mask &= ~arm64_ftr_mask(ftrp); 1252 break; 1253 } 1254 } 1255 1256 /* Bogus field? */ 1257 WARN_ON(!ftrp->width); 1258 } 1259 1260 static void lazy_init_32bit_cpu_features(struct cpuinfo_arm64 *info, 1261 struct cpuinfo_arm64 *boot) 1262 { 1263 static bool boot_cpu_32bit_regs_overridden = false; 1264 1265 if (!allow_mismatched_32bit_el0 || boot_cpu_32bit_regs_overridden) 1266 return; 1267 1268 if (id_aa64pfr0_32bit_el0(boot->reg_id_aa64pfr0)) 1269 return; 1270 1271 boot->aarch32 = info->aarch32; 1272 init_32bit_cpu_features(&boot->aarch32); 1273 boot_cpu_32bit_regs_overridden = true; 1274 } 1275 1276 static int update_32bit_cpu_features(int cpu, struct cpuinfo_32bit *info, 1277 struct cpuinfo_32bit *boot) 1278 { 1279 int taint = 0; 1280 u64 pfr0 = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1); 1281 1282 /* 1283 * If we don't have AArch32 at EL1, then relax the strictness of 1284 * EL1-dependent register fields to avoid spurious sanity check fails. 1285 */ 1286 if (!id_aa64pfr0_32bit_el1(pfr0)) { 1287 relax_cpu_ftr_reg(SYS_ID_ISAR4_EL1, ID_ISAR4_EL1_SMC_SHIFT); 1288 relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_EL1_Virt_frac_SHIFT); 1289 relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_EL1_Sec_frac_SHIFT); 1290 relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_EL1_Virtualization_SHIFT); 1291 relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_EL1_Security_SHIFT); 1292 relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_EL1_ProgMod_SHIFT); 1293 } 1294 1295 taint |= check_update_ftr_reg(SYS_ID_DFR0_EL1, cpu, 1296 info->reg_id_dfr0, boot->reg_id_dfr0); 1297 taint |= check_update_ftr_reg(SYS_ID_DFR1_EL1, cpu, 1298 info->reg_id_dfr1, boot->reg_id_dfr1); 1299 taint |= check_update_ftr_reg(SYS_ID_ISAR0_EL1, cpu, 1300 info->reg_id_isar0, boot->reg_id_isar0); 1301 taint |= check_update_ftr_reg(SYS_ID_ISAR1_EL1, cpu, 1302 info->reg_id_isar1, boot->reg_id_isar1); 1303 taint |= check_update_ftr_reg(SYS_ID_ISAR2_EL1, cpu, 1304 info->reg_id_isar2, boot->reg_id_isar2); 1305 taint |= check_update_ftr_reg(SYS_ID_ISAR3_EL1, cpu, 1306 info->reg_id_isar3, boot->reg_id_isar3); 1307 taint |= check_update_ftr_reg(SYS_ID_ISAR4_EL1, cpu, 1308 info->reg_id_isar4, boot->reg_id_isar4); 1309 taint |= check_update_ftr_reg(SYS_ID_ISAR5_EL1, cpu, 1310 info->reg_id_isar5, boot->reg_id_isar5); 1311 taint |= check_update_ftr_reg(SYS_ID_ISAR6_EL1, cpu, 1312 info->reg_id_isar6, boot->reg_id_isar6); 1313 1314 /* 1315 * Regardless of the value of the AuxReg field, the AIFSR, ADFSR, and 1316 * ACTLR formats could differ across CPUs and therefore would have to 1317 * be trapped for virtualization anyway. 1318 */ 1319 taint |= check_update_ftr_reg(SYS_ID_MMFR0_EL1, cpu, 1320 info->reg_id_mmfr0, boot->reg_id_mmfr0); 1321 taint |= check_update_ftr_reg(SYS_ID_MMFR1_EL1, cpu, 1322 info->reg_id_mmfr1, boot->reg_id_mmfr1); 1323 taint |= check_update_ftr_reg(SYS_ID_MMFR2_EL1, cpu, 1324 info->reg_id_mmfr2, boot->reg_id_mmfr2); 1325 taint |= check_update_ftr_reg(SYS_ID_MMFR3_EL1, cpu, 1326 info->reg_id_mmfr3, boot->reg_id_mmfr3); 1327 taint |= check_update_ftr_reg(SYS_ID_MMFR4_EL1, cpu, 1328 info->reg_id_mmfr4, boot->reg_id_mmfr4); 1329 taint |= check_update_ftr_reg(SYS_ID_MMFR5_EL1, cpu, 1330 info->reg_id_mmfr5, boot->reg_id_mmfr5); 1331 taint |= check_update_ftr_reg(SYS_ID_PFR0_EL1, cpu, 1332 info->reg_id_pfr0, boot->reg_id_pfr0); 1333 taint |= check_update_ftr_reg(SYS_ID_PFR1_EL1, cpu, 1334 info->reg_id_pfr1, boot->reg_id_pfr1); 1335 taint |= check_update_ftr_reg(SYS_ID_PFR2_EL1, cpu, 1336 info->reg_id_pfr2, boot->reg_id_pfr2); 1337 taint |= check_update_ftr_reg(SYS_MVFR0_EL1, cpu, 1338 info->reg_mvfr0, boot->reg_mvfr0); 1339 taint |= check_update_ftr_reg(SYS_MVFR1_EL1, cpu, 1340 info->reg_mvfr1, boot->reg_mvfr1); 1341 taint |= check_update_ftr_reg(SYS_MVFR2_EL1, cpu, 1342 info->reg_mvfr2, boot->reg_mvfr2); 1343 1344 return taint; 1345 } 1346 1347 /* 1348 * Update system wide CPU feature registers with the values from a 1349 * non-boot CPU. Also performs SANITY checks to make sure that there 1350 * aren't any insane variations from that of the boot CPU. 1351 */ 1352 void update_cpu_features(int cpu, 1353 struct cpuinfo_arm64 *info, 1354 struct cpuinfo_arm64 *boot) 1355 { 1356 int taint = 0; 1357 1358 /* 1359 * The kernel can handle differing I-cache policies, but otherwise 1360 * caches should look identical. Userspace JITs will make use of 1361 * *minLine. 1362 */ 1363 taint |= check_update_ftr_reg(SYS_CTR_EL0, cpu, 1364 info->reg_ctr, boot->reg_ctr); 1365 1366 /* 1367 * Userspace may perform DC ZVA instructions. Mismatched block sizes 1368 * could result in too much or too little memory being zeroed if a 1369 * process is preempted and migrated between CPUs. 1370 */ 1371 taint |= check_update_ftr_reg(SYS_DCZID_EL0, cpu, 1372 info->reg_dczid, boot->reg_dczid); 1373 1374 /* If different, timekeeping will be broken (especially with KVM) */ 1375 taint |= check_update_ftr_reg(SYS_CNTFRQ_EL0, cpu, 1376 info->reg_cntfrq, boot->reg_cntfrq); 1377 1378 /* 1379 * The kernel uses self-hosted debug features and expects CPUs to 1380 * support identical debug features. We presently need CTX_CMPs, WRPs, 1381 * and BRPs to be identical. 1382 * ID_AA64DFR1 is currently RES0. 1383 */ 1384 taint |= check_update_ftr_reg(SYS_ID_AA64DFR0_EL1, cpu, 1385 info->reg_id_aa64dfr0, boot->reg_id_aa64dfr0); 1386 taint |= check_update_ftr_reg(SYS_ID_AA64DFR1_EL1, cpu, 1387 info->reg_id_aa64dfr1, boot->reg_id_aa64dfr1); 1388 /* 1389 * Even in big.LITTLE, processors should be identical instruction-set 1390 * wise. 1391 */ 1392 taint |= check_update_ftr_reg(SYS_ID_AA64ISAR0_EL1, cpu, 1393 info->reg_id_aa64isar0, boot->reg_id_aa64isar0); 1394 taint |= check_update_ftr_reg(SYS_ID_AA64ISAR1_EL1, cpu, 1395 info->reg_id_aa64isar1, boot->reg_id_aa64isar1); 1396 taint |= check_update_ftr_reg(SYS_ID_AA64ISAR2_EL1, cpu, 1397 info->reg_id_aa64isar2, boot->reg_id_aa64isar2); 1398 taint |= check_update_ftr_reg(SYS_ID_AA64ISAR3_EL1, cpu, 1399 info->reg_id_aa64isar3, boot->reg_id_aa64isar3); 1400 1401 /* 1402 * Differing PARange support is fine as long as all peripherals and 1403 * memory are mapped within the minimum PARange of all CPUs. 1404 * Linux should not care about secure memory. 1405 */ 1406 taint |= check_update_ftr_reg(SYS_ID_AA64MMFR0_EL1, cpu, 1407 info->reg_id_aa64mmfr0, boot->reg_id_aa64mmfr0); 1408 taint |= check_update_ftr_reg(SYS_ID_AA64MMFR1_EL1, cpu, 1409 info->reg_id_aa64mmfr1, boot->reg_id_aa64mmfr1); 1410 taint |= check_update_ftr_reg(SYS_ID_AA64MMFR2_EL1, cpu, 1411 info->reg_id_aa64mmfr2, boot->reg_id_aa64mmfr2); 1412 taint |= check_update_ftr_reg(SYS_ID_AA64MMFR3_EL1, cpu, 1413 info->reg_id_aa64mmfr3, boot->reg_id_aa64mmfr3); 1414 1415 taint |= check_update_ftr_reg(SYS_ID_AA64PFR0_EL1, cpu, 1416 info->reg_id_aa64pfr0, boot->reg_id_aa64pfr0); 1417 taint |= check_update_ftr_reg(SYS_ID_AA64PFR1_EL1, cpu, 1418 info->reg_id_aa64pfr1, boot->reg_id_aa64pfr1); 1419 taint |= check_update_ftr_reg(SYS_ID_AA64PFR2_EL1, cpu, 1420 info->reg_id_aa64pfr2, boot->reg_id_aa64pfr2); 1421 1422 taint |= check_update_ftr_reg(SYS_ID_AA64ZFR0_EL1, cpu, 1423 info->reg_id_aa64zfr0, boot->reg_id_aa64zfr0); 1424 1425 taint |= check_update_ftr_reg(SYS_ID_AA64SMFR0_EL1, cpu, 1426 info->reg_id_aa64smfr0, boot->reg_id_aa64smfr0); 1427 1428 taint |= check_update_ftr_reg(SYS_ID_AA64FPFR0_EL1, cpu, 1429 info->reg_id_aa64fpfr0, boot->reg_id_aa64fpfr0); 1430 1431 /* Probe vector lengths */ 1432 if (IS_ENABLED(CONFIG_ARM64_SVE) && 1433 id_aa64pfr0_sve(read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1))) { 1434 if (!system_capabilities_finalized()) { 1435 unsigned long cpacr = cpacr_save_enable_kernel_sve(); 1436 1437 vec_update_vq_map(ARM64_VEC_SVE); 1438 1439 cpacr_restore(cpacr); 1440 } 1441 } 1442 1443 if (IS_ENABLED(CONFIG_ARM64_SME) && 1444 id_aa64pfr1_sme(read_sanitised_ftr_reg(SYS_ID_AA64PFR1_EL1))) { 1445 unsigned long cpacr = cpacr_save_enable_kernel_sme(); 1446 1447 /* Probe vector lengths */ 1448 if (!system_capabilities_finalized()) 1449 vec_update_vq_map(ARM64_VEC_SME); 1450 1451 cpacr_restore(cpacr); 1452 } 1453 1454 if (id_aa64pfr0_mpam(info->reg_id_aa64pfr0)) { 1455 taint |= check_update_ftr_reg(SYS_MPAMIDR_EL1, cpu, 1456 info->reg_mpamidr, boot->reg_mpamidr); 1457 } 1458 1459 /* 1460 * The kernel uses the LDGM/STGM instructions and the number of tags 1461 * they read/write depends on the GMID_EL1.BS field. Check that the 1462 * value is the same on all CPUs. 1463 */ 1464 if (IS_ENABLED(CONFIG_ARM64_MTE) && 1465 id_aa64pfr1_mte(info->reg_id_aa64pfr1)) { 1466 taint |= check_update_ftr_reg(SYS_GMID_EL1, cpu, 1467 info->reg_gmid, boot->reg_gmid); 1468 } 1469 1470 /* 1471 * If we don't have AArch32 at all then skip the checks entirely 1472 * as the register values may be UNKNOWN and we're not going to be 1473 * using them for anything. 1474 * 1475 * This relies on a sanitised view of the AArch64 ID registers 1476 * (e.g. SYS_ID_AA64PFR0_EL1), so we call it last. 1477 */ 1478 if (id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0)) { 1479 lazy_init_32bit_cpu_features(info, boot); 1480 taint |= update_32bit_cpu_features(cpu, &info->aarch32, 1481 &boot->aarch32); 1482 } 1483 1484 /* 1485 * Mismatched CPU features are a recipe for disaster. Don't even 1486 * pretend to support them. 1487 */ 1488 if (taint) { 1489 pr_warn_once("Unsupported CPU feature variation detected.\n"); 1490 add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_STILL_OK); 1491 } 1492 } 1493 1494 u64 read_sanitised_ftr_reg(u32 id) 1495 { 1496 struct arm64_ftr_reg *regp = get_arm64_ftr_reg(id); 1497 1498 if (!regp) 1499 return 0; 1500 return regp->sys_val; 1501 } 1502 EXPORT_SYMBOL_GPL(read_sanitised_ftr_reg); 1503 1504 #define read_sysreg_case(r) \ 1505 case r: val = read_sysreg_s(r); break; 1506 1507 /* 1508 * __read_sysreg_by_encoding() - Used by a STARTING cpu before cpuinfo is populated. 1509 * Read the system register on the current CPU 1510 */ 1511 u64 __read_sysreg_by_encoding(u32 sys_id) 1512 { 1513 struct arm64_ftr_reg *regp; 1514 u64 val; 1515 1516 switch (sys_id) { 1517 read_sysreg_case(SYS_ID_PFR0_EL1); 1518 read_sysreg_case(SYS_ID_PFR1_EL1); 1519 read_sysreg_case(SYS_ID_PFR2_EL1); 1520 read_sysreg_case(SYS_ID_DFR0_EL1); 1521 read_sysreg_case(SYS_ID_DFR1_EL1); 1522 read_sysreg_case(SYS_ID_MMFR0_EL1); 1523 read_sysreg_case(SYS_ID_MMFR1_EL1); 1524 read_sysreg_case(SYS_ID_MMFR2_EL1); 1525 read_sysreg_case(SYS_ID_MMFR3_EL1); 1526 read_sysreg_case(SYS_ID_MMFR4_EL1); 1527 read_sysreg_case(SYS_ID_MMFR5_EL1); 1528 read_sysreg_case(SYS_ID_ISAR0_EL1); 1529 read_sysreg_case(SYS_ID_ISAR1_EL1); 1530 read_sysreg_case(SYS_ID_ISAR2_EL1); 1531 read_sysreg_case(SYS_ID_ISAR3_EL1); 1532 read_sysreg_case(SYS_ID_ISAR4_EL1); 1533 read_sysreg_case(SYS_ID_ISAR5_EL1); 1534 read_sysreg_case(SYS_ID_ISAR6_EL1); 1535 read_sysreg_case(SYS_MVFR0_EL1); 1536 read_sysreg_case(SYS_MVFR1_EL1); 1537 read_sysreg_case(SYS_MVFR2_EL1); 1538 1539 read_sysreg_case(SYS_ID_AA64PFR0_EL1); 1540 read_sysreg_case(SYS_ID_AA64PFR1_EL1); 1541 read_sysreg_case(SYS_ID_AA64PFR2_EL1); 1542 read_sysreg_case(SYS_ID_AA64ZFR0_EL1); 1543 read_sysreg_case(SYS_ID_AA64SMFR0_EL1); 1544 read_sysreg_case(SYS_ID_AA64FPFR0_EL1); 1545 read_sysreg_case(SYS_ID_AA64DFR0_EL1); 1546 read_sysreg_case(SYS_ID_AA64DFR1_EL1); 1547 read_sysreg_case(SYS_ID_AA64MMFR0_EL1); 1548 read_sysreg_case(SYS_ID_AA64MMFR1_EL1); 1549 read_sysreg_case(SYS_ID_AA64MMFR2_EL1); 1550 read_sysreg_case(SYS_ID_AA64MMFR3_EL1); 1551 read_sysreg_case(SYS_ID_AA64MMFR4_EL1); 1552 read_sysreg_case(SYS_ID_AA64ISAR0_EL1); 1553 read_sysreg_case(SYS_ID_AA64ISAR1_EL1); 1554 read_sysreg_case(SYS_ID_AA64ISAR2_EL1); 1555 read_sysreg_case(SYS_ID_AA64ISAR3_EL1); 1556 1557 read_sysreg_case(SYS_CNTFRQ_EL0); 1558 read_sysreg_case(SYS_CTR_EL0); 1559 read_sysreg_case(SYS_DCZID_EL0); 1560 1561 default: 1562 BUG(); 1563 return 0; 1564 } 1565 1566 regp = get_arm64_ftr_reg(sys_id); 1567 if (regp) { 1568 val &= ~regp->override->mask; 1569 val |= (regp->override->val & regp->override->mask); 1570 } 1571 1572 return val; 1573 } 1574 1575 #include <linux/irqchip/arm-gic-v3.h> 1576 1577 static bool 1578 has_always(const struct arm64_cpu_capabilities *entry, int scope) 1579 { 1580 return true; 1581 } 1582 1583 static bool 1584 feature_matches(u64 reg, const struct arm64_cpu_capabilities *entry) 1585 { 1586 int val, min, max; 1587 u64 tmp; 1588 1589 val = cpuid_feature_extract_field_width(reg, entry->field_pos, 1590 entry->field_width, 1591 entry->sign); 1592 1593 tmp = entry->min_field_value; 1594 tmp <<= entry->field_pos; 1595 1596 min = cpuid_feature_extract_field_width(tmp, entry->field_pos, 1597 entry->field_width, 1598 entry->sign); 1599 1600 tmp = entry->max_field_value; 1601 tmp <<= entry->field_pos; 1602 1603 max = cpuid_feature_extract_field_width(tmp, entry->field_pos, 1604 entry->field_width, 1605 entry->sign); 1606 1607 return val >= min && val <= max; 1608 } 1609 1610 static u64 1611 read_scoped_sysreg(const struct arm64_cpu_capabilities *entry, int scope) 1612 { 1613 WARN_ON(scope == SCOPE_LOCAL_CPU && preemptible()); 1614 if (scope == SCOPE_SYSTEM) 1615 return read_sanitised_ftr_reg(entry->sys_reg); 1616 else 1617 return __read_sysreg_by_encoding(entry->sys_reg); 1618 } 1619 1620 static bool 1621 has_user_cpuid_feature(const struct arm64_cpu_capabilities *entry, int scope) 1622 { 1623 int mask; 1624 struct arm64_ftr_reg *regp; 1625 u64 val = read_scoped_sysreg(entry, scope); 1626 1627 regp = get_arm64_ftr_reg(entry->sys_reg); 1628 if (!regp) 1629 return false; 1630 1631 mask = cpuid_feature_extract_unsigned_field_width(regp->user_mask, 1632 entry->field_pos, 1633 entry->field_width); 1634 if (!mask) 1635 return false; 1636 1637 return feature_matches(val, entry); 1638 } 1639 1640 static bool 1641 has_cpuid_feature(const struct arm64_cpu_capabilities *entry, int scope) 1642 { 1643 u64 val = read_scoped_sysreg(entry, scope); 1644 return feature_matches(val, entry); 1645 } 1646 1647 const struct cpumask *system_32bit_el0_cpumask(void) 1648 { 1649 if (!system_supports_32bit_el0()) 1650 return cpu_none_mask; 1651 1652 if (static_branch_unlikely(&arm64_mismatched_32bit_el0)) 1653 return cpu_32bit_el0_mask; 1654 1655 return cpu_possible_mask; 1656 } 1657 1658 const struct cpumask *task_cpu_fallback_mask(struct task_struct *p) 1659 { 1660 return __task_cpu_possible_mask(p, housekeeping_cpumask(HK_TYPE_TICK)); 1661 } 1662 1663 static int __init parse_32bit_el0_param(char *str) 1664 { 1665 allow_mismatched_32bit_el0 = true; 1666 return 0; 1667 } 1668 early_param("allow_mismatched_32bit_el0", parse_32bit_el0_param); 1669 1670 static ssize_t aarch32_el0_show(struct device *dev, 1671 struct device_attribute *attr, char *buf) 1672 { 1673 const struct cpumask *mask = system_32bit_el0_cpumask(); 1674 1675 return sysfs_emit(buf, "%*pbl\n", cpumask_pr_args(mask)); 1676 } 1677 static const DEVICE_ATTR_RO(aarch32_el0); 1678 1679 static int __init aarch32_el0_sysfs_init(void) 1680 { 1681 struct device *dev_root; 1682 int ret = 0; 1683 1684 if (!allow_mismatched_32bit_el0) 1685 return 0; 1686 1687 dev_root = bus_get_dev_root(&cpu_subsys); 1688 if (dev_root) { 1689 ret = device_create_file(dev_root, &dev_attr_aarch32_el0); 1690 put_device(dev_root); 1691 } 1692 return ret; 1693 } 1694 device_initcall(aarch32_el0_sysfs_init); 1695 1696 static bool has_32bit_el0(const struct arm64_cpu_capabilities *entry, int scope) 1697 { 1698 if (!has_cpuid_feature(entry, scope)) 1699 return allow_mismatched_32bit_el0; 1700 1701 if (scope == SCOPE_SYSTEM) 1702 pr_info("detected: 32-bit EL0 Support\n"); 1703 1704 return true; 1705 } 1706 1707 static bool has_useable_gicv3_cpuif(const struct arm64_cpu_capabilities *entry, int scope) 1708 { 1709 bool has_sre; 1710 1711 if (!has_cpuid_feature(entry, scope)) 1712 return false; 1713 1714 has_sre = gic_enable_sre(); 1715 if (!has_sre) 1716 pr_warn_once("%s present but disabled by higher exception level\n", 1717 entry->desc); 1718 1719 return has_sre; 1720 } 1721 1722 static bool has_cache_idc(const struct arm64_cpu_capabilities *entry, 1723 int scope) 1724 { 1725 u64 ctr; 1726 1727 if (scope == SCOPE_SYSTEM) 1728 ctr = arm64_ftr_reg_ctrel0.sys_val; 1729 else 1730 ctr = read_cpuid_effective_cachetype(); 1731 1732 return ctr & BIT(CTR_EL0_IDC_SHIFT); 1733 } 1734 1735 static void cpu_emulate_effective_ctr(const struct arm64_cpu_capabilities *__unused) 1736 { 1737 /* 1738 * If the CPU exposes raw CTR_EL0.IDC = 0, while effectively 1739 * CTR_EL0.IDC = 1 (from CLIDR values), we need to trap accesses 1740 * to the CTR_EL0 on this CPU and emulate it with the real/safe 1741 * value. 1742 */ 1743 if (!(read_cpuid_cachetype() & BIT(CTR_EL0_IDC_SHIFT))) 1744 sysreg_clear_set(sctlr_el1, SCTLR_EL1_UCT, 0); 1745 } 1746 1747 static bool has_cache_dic(const struct arm64_cpu_capabilities *entry, 1748 int scope) 1749 { 1750 u64 ctr; 1751 1752 if (scope == SCOPE_SYSTEM) 1753 ctr = arm64_ftr_reg_ctrel0.sys_val; 1754 else 1755 ctr = read_cpuid_cachetype(); 1756 1757 return ctr & BIT(CTR_EL0_DIC_SHIFT); 1758 } 1759 1760 static bool __maybe_unused 1761 has_useable_cnp(const struct arm64_cpu_capabilities *entry, int scope) 1762 { 1763 /* 1764 * Kdump isn't guaranteed to power-off all secondary CPUs, CNP 1765 * may share TLB entries with a CPU stuck in the crashed 1766 * kernel. 1767 */ 1768 if (is_kdump_kernel()) 1769 return false; 1770 1771 if (cpus_have_cap(ARM64_WORKAROUND_NVIDIA_CARMEL_CNP)) 1772 return false; 1773 1774 return has_cpuid_feature(entry, scope); 1775 } 1776 1777 static bool __meltdown_safe = true; 1778 static int __kpti_forced; /* 0: not forced, >0: forced on, <0: forced off */ 1779 1780 static bool unmap_kernel_at_el0(const struct arm64_cpu_capabilities *entry, 1781 int scope) 1782 { 1783 /* List of CPUs that are not vulnerable and don't need KPTI */ 1784 static const struct midr_range kpti_safe_list[] = { 1785 MIDR_ALL_VERSIONS(MIDR_CAVIUM_THUNDERX2), 1786 MIDR_ALL_VERSIONS(MIDR_BRCM_VULCAN), 1787 MIDR_ALL_VERSIONS(MIDR_BRAHMA_B53), 1788 MIDR_ALL_VERSIONS(MIDR_CORTEX_A35), 1789 MIDR_ALL_VERSIONS(MIDR_CORTEX_A53), 1790 MIDR_ALL_VERSIONS(MIDR_CORTEX_A55), 1791 MIDR_ALL_VERSIONS(MIDR_CORTEX_A57), 1792 MIDR_ALL_VERSIONS(MIDR_CORTEX_A72), 1793 MIDR_ALL_VERSIONS(MIDR_CORTEX_A73), 1794 MIDR_ALL_VERSIONS(MIDR_HISI_TSV110), 1795 MIDR_ALL_VERSIONS(MIDR_NVIDIA_CARMEL), 1796 MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_2XX_GOLD), 1797 MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_2XX_SILVER), 1798 MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_3XX_SILVER), 1799 MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_4XX_SILVER), 1800 { /* sentinel */ } 1801 }; 1802 char const *str = "kpti command line option"; 1803 bool meltdown_safe; 1804 1805 meltdown_safe = is_midr_in_range_list(kpti_safe_list); 1806 1807 /* Defer to CPU feature registers */ 1808 if (has_cpuid_feature(entry, scope)) 1809 meltdown_safe = true; 1810 1811 if (!meltdown_safe) 1812 __meltdown_safe = false; 1813 1814 /* 1815 * For reasons that aren't entirely clear, enabling KPTI on Cavium 1816 * ThunderX leads to apparent I-cache corruption of kernel text, which 1817 * ends as well as you might imagine. Don't even try. We cannot rely 1818 * on the cpus_have_*cap() helpers here to detect the CPU erratum 1819 * because cpucap detection order may change. However, since we know 1820 * affected CPUs are always in a homogeneous configuration, it is 1821 * safe to rely on this_cpu_has_cap() here. 1822 */ 1823 if (this_cpu_has_cap(ARM64_WORKAROUND_CAVIUM_27456)) { 1824 str = "ARM64_WORKAROUND_CAVIUM_27456"; 1825 __kpti_forced = -1; 1826 } 1827 1828 /* Useful for KASLR robustness */ 1829 if (kaslr_enabled() && kaslr_requires_kpti()) { 1830 if (!__kpti_forced) { 1831 str = "KASLR"; 1832 __kpti_forced = 1; 1833 } 1834 } 1835 1836 if (cpu_mitigations_off() && !__kpti_forced) { 1837 str = "mitigations=off"; 1838 __kpti_forced = -1; 1839 } 1840 1841 if (!IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0)) { 1842 pr_info_once("kernel page table isolation disabled by kernel configuration\n"); 1843 return false; 1844 } 1845 1846 /* Forced? */ 1847 if (__kpti_forced) { 1848 pr_info_once("kernel page table isolation forced %s by %s\n", 1849 __kpti_forced > 0 ? "ON" : "OFF", str); 1850 return __kpti_forced > 0; 1851 } 1852 1853 return !meltdown_safe; 1854 } 1855 1856 static bool has_nv1(const struct arm64_cpu_capabilities *entry, int scope) 1857 { 1858 /* 1859 * Although the Apple M2 family appears to support NV1, the 1860 * PTW barfs on the nVHE EL2 S1 page table format. Pretend 1861 * that it doesn't support NV1 at all. 1862 */ 1863 static const struct midr_range nv1_ni_list[] = { 1864 MIDR_ALL_VERSIONS(MIDR_APPLE_M2_BLIZZARD), 1865 MIDR_ALL_VERSIONS(MIDR_APPLE_M2_AVALANCHE), 1866 MIDR_ALL_VERSIONS(MIDR_APPLE_M2_BLIZZARD_PRO), 1867 MIDR_ALL_VERSIONS(MIDR_APPLE_M2_AVALANCHE_PRO), 1868 MIDR_ALL_VERSIONS(MIDR_APPLE_M2_BLIZZARD_MAX), 1869 MIDR_ALL_VERSIONS(MIDR_APPLE_M2_AVALANCHE_MAX), 1870 {} 1871 }; 1872 1873 return (__system_matches_cap(ARM64_HAS_NESTED_VIRT) && 1874 !(has_cpuid_feature(entry, scope) || 1875 is_midr_in_range_list(nv1_ni_list))); 1876 } 1877 1878 #if defined(ID_AA64MMFR0_EL1_TGRAN_LPA2) && defined(ID_AA64MMFR0_EL1_TGRAN_2_SUPPORTED_LPA2) 1879 static bool has_lpa2_at_stage1(u64 mmfr0) 1880 { 1881 unsigned int tgran; 1882 1883 tgran = cpuid_feature_extract_unsigned_field(mmfr0, 1884 ID_AA64MMFR0_EL1_TGRAN_SHIFT); 1885 return tgran == ID_AA64MMFR0_EL1_TGRAN_LPA2; 1886 } 1887 1888 static bool has_lpa2_at_stage2(u64 mmfr0) 1889 { 1890 unsigned int tgran; 1891 1892 tgran = cpuid_feature_extract_unsigned_field(mmfr0, 1893 ID_AA64MMFR0_EL1_TGRAN_2_SHIFT); 1894 return tgran == ID_AA64MMFR0_EL1_TGRAN_2_SUPPORTED_LPA2; 1895 } 1896 1897 static bool has_lpa2(const struct arm64_cpu_capabilities *entry, int scope) 1898 { 1899 u64 mmfr0; 1900 1901 mmfr0 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1); 1902 return has_lpa2_at_stage1(mmfr0) && has_lpa2_at_stage2(mmfr0); 1903 } 1904 #else 1905 static bool has_lpa2(const struct arm64_cpu_capabilities *entry, int scope) 1906 { 1907 return false; 1908 } 1909 #endif 1910 1911 #ifdef CONFIG_HW_PERF_EVENTS 1912 static bool has_pmuv3(const struct arm64_cpu_capabilities *entry, int scope) 1913 { 1914 u64 dfr0 = read_sanitised_ftr_reg(SYS_ID_AA64DFR0_EL1); 1915 unsigned int pmuver; 1916 1917 /* 1918 * PMUVer follows the standard ID scheme for an unsigned field with the 1919 * exception of 0xF (IMP_DEF) which is treated specially and implies 1920 * FEAT_PMUv3 is not implemented. 1921 * 1922 * See DDI0487L.a D24.1.3.2 for more details. 1923 */ 1924 pmuver = cpuid_feature_extract_unsigned_field(dfr0, 1925 ID_AA64DFR0_EL1_PMUVer_SHIFT); 1926 if (pmuver == ID_AA64DFR0_EL1_PMUVer_IMP_DEF) 1927 return false; 1928 1929 return pmuver >= ID_AA64DFR0_EL1_PMUVer_IMP; 1930 } 1931 #endif 1932 1933 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 1934 #define KPTI_NG_TEMP_VA (-(1UL << PMD_SHIFT)) 1935 1936 extern 1937 void create_kpti_ng_temp_pgd(pgd_t *pgdir, phys_addr_t phys, unsigned long virt, 1938 phys_addr_t size, pgprot_t prot, 1939 phys_addr_t (*pgtable_alloc)(int), int flags); 1940 1941 static phys_addr_t __initdata kpti_ng_temp_alloc; 1942 1943 static phys_addr_t __init kpti_ng_pgd_alloc(int shift) 1944 { 1945 kpti_ng_temp_alloc -= PAGE_SIZE; 1946 return kpti_ng_temp_alloc; 1947 } 1948 1949 static int __init __kpti_install_ng_mappings(void *__unused) 1950 { 1951 typedef void (kpti_remap_fn)(int, int, phys_addr_t, unsigned long); 1952 extern kpti_remap_fn idmap_kpti_install_ng_mappings; 1953 kpti_remap_fn *remap_fn; 1954 1955 int cpu = smp_processor_id(); 1956 int levels = CONFIG_PGTABLE_LEVELS; 1957 int order = order_base_2(levels); 1958 u64 kpti_ng_temp_pgd_pa = 0; 1959 pgd_t *kpti_ng_temp_pgd; 1960 u64 alloc = 0; 1961 1962 if (levels == 5 && !pgtable_l5_enabled()) 1963 levels = 4; 1964 else if (levels == 4 && !pgtable_l4_enabled()) 1965 levels = 3; 1966 1967 remap_fn = (void *)__pa_symbol(idmap_kpti_install_ng_mappings); 1968 1969 if (!cpu) { 1970 alloc = __get_free_pages(GFP_ATOMIC | __GFP_ZERO, order); 1971 kpti_ng_temp_pgd = (pgd_t *)(alloc + (levels - 1) * PAGE_SIZE); 1972 kpti_ng_temp_alloc = kpti_ng_temp_pgd_pa = __pa(kpti_ng_temp_pgd); 1973 1974 // 1975 // Create a minimal page table hierarchy that permits us to map 1976 // the swapper page tables temporarily as we traverse them. 1977 // 1978 // The physical pages are laid out as follows: 1979 // 1980 // +--------+-/-------+-/------ +-/------ +-\\\--------+ 1981 // : PTE[] : | PMD[] : | PUD[] : | P4D[] : ||| PGD[] : 1982 // +--------+-\-------+-\------ +-\------ +-///--------+ 1983 // ^ 1984 // The first page is mapped into this hierarchy at a PMD_SHIFT 1985 // aligned virtual address, so that we can manipulate the PTE 1986 // level entries while the mapping is active. The first entry 1987 // covers the PTE[] page itself, the remaining entries are free 1988 // to be used as a ad-hoc fixmap. 1989 // 1990 create_kpti_ng_temp_pgd(kpti_ng_temp_pgd, __pa(alloc), 1991 KPTI_NG_TEMP_VA, PAGE_SIZE, PAGE_KERNEL, 1992 kpti_ng_pgd_alloc, 0); 1993 } 1994 1995 cpu_install_idmap(); 1996 remap_fn(cpu, num_online_cpus(), kpti_ng_temp_pgd_pa, KPTI_NG_TEMP_VA); 1997 cpu_uninstall_idmap(); 1998 1999 if (!cpu) { 2000 free_pages(alloc, order); 2001 arm64_use_ng_mappings = true; 2002 } 2003 2004 return 0; 2005 } 2006 2007 static void __init kpti_install_ng_mappings(void) 2008 { 2009 /* Check whether KPTI is going to be used */ 2010 if (!arm64_kernel_unmapped_at_el0()) 2011 return; 2012 2013 /* 2014 * We don't need to rewrite the page-tables if either we've done 2015 * it already or we have KASLR enabled and therefore have not 2016 * created any global mappings at all. 2017 */ 2018 if (arm64_use_ng_mappings) 2019 return; 2020 2021 stop_machine(__kpti_install_ng_mappings, NULL, cpu_online_mask); 2022 } 2023 2024 #else 2025 static inline void kpti_install_ng_mappings(void) 2026 { 2027 } 2028 #endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */ 2029 2030 static void cpu_enable_kpti(struct arm64_cpu_capabilities const *cap) 2031 { 2032 if (__this_cpu_read(this_cpu_vector) == vectors) { 2033 const char *v = arm64_get_bp_hardening_vector(EL1_VECTOR_KPTI); 2034 2035 __this_cpu_write(this_cpu_vector, v); 2036 } 2037 2038 } 2039 2040 static int __init parse_kpti(char *str) 2041 { 2042 bool enabled; 2043 int ret = kstrtobool(str, &enabled); 2044 2045 if (ret) 2046 return ret; 2047 2048 __kpti_forced = enabled ? 1 : -1; 2049 return 0; 2050 } 2051 early_param("kpti", parse_kpti); 2052 2053 #ifdef CONFIG_ARM64_HW_AFDBM 2054 static struct cpumask dbm_cpus __read_mostly; 2055 2056 static inline void __cpu_enable_hw_dbm(void) 2057 { 2058 u64 tcr = read_sysreg(tcr_el1) | TCR_HD; 2059 2060 write_sysreg(tcr, tcr_el1); 2061 isb(); 2062 local_flush_tlb_all(); 2063 } 2064 2065 static bool cpu_has_broken_dbm(void) 2066 { 2067 /* List of CPUs which have broken DBM support. */ 2068 static const struct midr_range cpus[] = { 2069 #ifdef CONFIG_ARM64_ERRATUM_1024718 2070 MIDR_ALL_VERSIONS(MIDR_CORTEX_A55), 2071 /* Kryo4xx Silver (rdpe => r1p0) */ 2072 MIDR_REV(MIDR_QCOM_KRYO_4XX_SILVER, 0xd, 0xe), 2073 #endif 2074 #ifdef CONFIG_ARM64_ERRATUM_2051678 2075 MIDR_REV_RANGE(MIDR_CORTEX_A510, 0, 0, 2), 2076 #endif 2077 {}, 2078 }; 2079 2080 return is_midr_in_range_list(cpus); 2081 } 2082 2083 static bool cpu_can_use_dbm(const struct arm64_cpu_capabilities *cap) 2084 { 2085 return has_cpuid_feature(cap, SCOPE_LOCAL_CPU) && 2086 !cpu_has_broken_dbm(); 2087 } 2088 2089 static void cpu_enable_hw_dbm(struct arm64_cpu_capabilities const *cap) 2090 { 2091 if (cpu_can_use_dbm(cap)) { 2092 __cpu_enable_hw_dbm(); 2093 cpumask_set_cpu(smp_processor_id(), &dbm_cpus); 2094 } 2095 } 2096 2097 static bool has_hw_dbm(const struct arm64_cpu_capabilities *cap, 2098 int __unused) 2099 { 2100 /* 2101 * DBM is a non-conflicting feature. i.e, the kernel can safely 2102 * run a mix of CPUs with and without the feature. So, we 2103 * unconditionally enable the capability to allow any late CPU 2104 * to use the feature. We only enable the control bits on the 2105 * CPU, if it is supported. 2106 */ 2107 2108 return true; 2109 } 2110 2111 #endif 2112 2113 #ifdef CONFIG_ARM64_AMU_EXTN 2114 2115 /* 2116 * The "amu_cpus" cpumask only signals that the CPU implementation for the 2117 * flagged CPUs supports the Activity Monitors Unit (AMU) but does not provide 2118 * information regarding all the events that it supports. When a CPU bit is 2119 * set in the cpumask, the user of this feature can only rely on the presence 2120 * of the 4 fixed counters for that CPU. But this does not guarantee that the 2121 * counters are enabled or access to these counters is enabled by code 2122 * executed at higher exception levels (firmware). 2123 */ 2124 static struct cpumask amu_cpus __read_mostly; 2125 2126 bool cpu_has_amu_feat(int cpu) 2127 { 2128 return cpumask_test_cpu(cpu, &amu_cpus); 2129 } 2130 2131 int get_cpu_with_amu_feat(void) 2132 { 2133 return cpumask_any(&amu_cpus); 2134 } 2135 2136 static void cpu_amu_enable(struct arm64_cpu_capabilities const *cap) 2137 { 2138 if (has_cpuid_feature(cap, SCOPE_LOCAL_CPU)) { 2139 cpumask_set_cpu(smp_processor_id(), &amu_cpus); 2140 2141 /* 0 reference values signal broken/disabled counters */ 2142 if (!this_cpu_has_cap(ARM64_WORKAROUND_2457168)) 2143 update_freq_counters_refs(); 2144 } 2145 } 2146 2147 static bool has_amu(const struct arm64_cpu_capabilities *cap, 2148 int __unused) 2149 { 2150 /* 2151 * The AMU extension is a non-conflicting feature: the kernel can 2152 * safely run a mix of CPUs with and without support for the 2153 * activity monitors extension. Therefore, unconditionally enable 2154 * the capability to allow any late CPU to use the feature. 2155 * 2156 * With this feature unconditionally enabled, the cpu_enable 2157 * function will be called for all CPUs that match the criteria, 2158 * including secondary and hotplugged, marking this feature as 2159 * present on that respective CPU. The enable function will also 2160 * print a detection message. 2161 */ 2162 2163 return true; 2164 } 2165 #else 2166 int get_cpu_with_amu_feat(void) 2167 { 2168 return nr_cpu_ids; 2169 } 2170 #endif 2171 2172 static bool runs_at_el2(const struct arm64_cpu_capabilities *entry, int __unused) 2173 { 2174 return is_kernel_in_hyp_mode(); 2175 } 2176 2177 static void cpu_copy_el2regs(const struct arm64_cpu_capabilities *__unused) 2178 { 2179 /* 2180 * Copy register values that aren't redirected by hardware. 2181 * 2182 * Before code patching, we only set tpidr_el1, all CPUs need to copy 2183 * this value to tpidr_el2 before we patch the code. Once we've done 2184 * that, freshly-onlined CPUs will set tpidr_el2, so we don't need to 2185 * do anything here. 2186 */ 2187 if (!alternative_is_applied(ARM64_HAS_VIRT_HOST_EXTN)) 2188 write_sysreg(read_sysreg(tpidr_el1), tpidr_el2); 2189 } 2190 2191 static bool has_nested_virt_support(const struct arm64_cpu_capabilities *cap, 2192 int scope) 2193 { 2194 if (kvm_get_mode() != KVM_MODE_NV) 2195 return false; 2196 2197 if (!cpucap_multi_entry_cap_matches(cap, scope)) { 2198 pr_warn("unavailable: %s\n", cap->desc); 2199 return false; 2200 } 2201 2202 return true; 2203 } 2204 2205 static bool hvhe_possible(const struct arm64_cpu_capabilities *entry, 2206 int __unused) 2207 { 2208 return arm64_test_sw_feature_override(ARM64_SW_FEATURE_OVERRIDE_HVHE); 2209 } 2210 2211 #ifdef CONFIG_ARM64_PAN 2212 static void cpu_enable_pan(const struct arm64_cpu_capabilities *__unused) 2213 { 2214 /* 2215 * We modify PSTATE. This won't work from irq context as the PSTATE 2216 * is discarded once we return from the exception. 2217 */ 2218 WARN_ON_ONCE(in_interrupt()); 2219 2220 sysreg_clear_set(sctlr_el1, SCTLR_EL1_SPAN, 0); 2221 set_pstate_pan(1); 2222 } 2223 #endif /* CONFIG_ARM64_PAN */ 2224 2225 #ifdef CONFIG_ARM64_RAS_EXTN 2226 static void cpu_clear_disr(const struct arm64_cpu_capabilities *__unused) 2227 { 2228 /* Firmware may have left a deferred SError in this register. */ 2229 write_sysreg_s(0, SYS_DISR_EL1); 2230 } 2231 #endif /* CONFIG_ARM64_RAS_EXTN */ 2232 2233 #ifdef CONFIG_ARM64_PTR_AUTH 2234 static bool has_address_auth_cpucap(const struct arm64_cpu_capabilities *entry, int scope) 2235 { 2236 int boot_val, sec_val; 2237 2238 /* We don't expect to be called with SCOPE_SYSTEM */ 2239 WARN_ON(scope == SCOPE_SYSTEM); 2240 /* 2241 * The ptr-auth feature levels are not intercompatible with lower 2242 * levels. Hence we must match ptr-auth feature level of the secondary 2243 * CPUs with that of the boot CPU. The level of boot cpu is fetched 2244 * from the sanitised register whereas direct register read is done for 2245 * the secondary CPUs. 2246 * The sanitised feature state is guaranteed to match that of the 2247 * boot CPU as a mismatched secondary CPU is parked before it gets 2248 * a chance to update the state, with the capability. 2249 */ 2250 boot_val = cpuid_feature_extract_field(read_sanitised_ftr_reg(entry->sys_reg), 2251 entry->field_pos, entry->sign); 2252 if (scope & SCOPE_BOOT_CPU) 2253 return boot_val >= entry->min_field_value; 2254 /* Now check for the secondary CPUs with SCOPE_LOCAL_CPU scope */ 2255 sec_val = cpuid_feature_extract_field(__read_sysreg_by_encoding(entry->sys_reg), 2256 entry->field_pos, entry->sign); 2257 return (sec_val >= entry->min_field_value) && (sec_val == boot_val); 2258 } 2259 2260 static bool has_address_auth_metacap(const struct arm64_cpu_capabilities *entry, 2261 int scope) 2262 { 2263 bool api = has_address_auth_cpucap(cpucap_ptrs[ARM64_HAS_ADDRESS_AUTH_IMP_DEF], scope); 2264 bool apa = has_address_auth_cpucap(cpucap_ptrs[ARM64_HAS_ADDRESS_AUTH_ARCH_QARMA5], scope); 2265 bool apa3 = has_address_auth_cpucap(cpucap_ptrs[ARM64_HAS_ADDRESS_AUTH_ARCH_QARMA3], scope); 2266 2267 return apa || apa3 || api; 2268 } 2269 2270 static bool has_generic_auth(const struct arm64_cpu_capabilities *entry, 2271 int __unused) 2272 { 2273 bool gpi = __system_matches_cap(ARM64_HAS_GENERIC_AUTH_IMP_DEF); 2274 bool gpa = __system_matches_cap(ARM64_HAS_GENERIC_AUTH_ARCH_QARMA5); 2275 bool gpa3 = __system_matches_cap(ARM64_HAS_GENERIC_AUTH_ARCH_QARMA3); 2276 2277 return gpa || gpa3 || gpi; 2278 } 2279 #endif /* CONFIG_ARM64_PTR_AUTH */ 2280 2281 #ifdef CONFIG_ARM64_E0PD 2282 static void cpu_enable_e0pd(struct arm64_cpu_capabilities const *cap) 2283 { 2284 if (this_cpu_has_cap(ARM64_HAS_E0PD)) 2285 sysreg_clear_set(tcr_el1, 0, TCR_E0PD1); 2286 } 2287 #endif /* CONFIG_ARM64_E0PD */ 2288 2289 #ifdef CONFIG_ARM64_PSEUDO_NMI 2290 static bool can_use_gic_priorities(const struct arm64_cpu_capabilities *entry, 2291 int scope) 2292 { 2293 /* 2294 * ARM64_HAS_GIC_CPUIF_SYSREGS has a lower index, and is a boot CPU 2295 * feature, so will be detected earlier. 2296 */ 2297 BUILD_BUG_ON(ARM64_HAS_GIC_PRIO_MASKING <= ARM64_HAS_GIC_CPUIF_SYSREGS); 2298 if (!cpus_have_cap(ARM64_HAS_GIC_CPUIF_SYSREGS)) 2299 return false; 2300 2301 return enable_pseudo_nmi; 2302 } 2303 2304 static bool has_gic_prio_relaxed_sync(const struct arm64_cpu_capabilities *entry, 2305 int scope) 2306 { 2307 /* 2308 * If we're not using priority masking then we won't be poking PMR_EL1, 2309 * and there's no need to relax synchronization of writes to it, and 2310 * ICC_CTLR_EL1 might not be accessible and we must avoid reads from 2311 * that. 2312 * 2313 * ARM64_HAS_GIC_PRIO_MASKING has a lower index, and is a boot CPU 2314 * feature, so will be detected earlier. 2315 */ 2316 BUILD_BUG_ON(ARM64_HAS_GIC_PRIO_RELAXED_SYNC <= ARM64_HAS_GIC_PRIO_MASKING); 2317 if (!cpus_have_cap(ARM64_HAS_GIC_PRIO_MASKING)) 2318 return false; 2319 2320 /* 2321 * When Priority Mask Hint Enable (PMHE) == 0b0, PMR is not used as a 2322 * hint for interrupt distribution, a DSB is not necessary when 2323 * unmasking IRQs via PMR, and we can relax the barrier to a NOP. 2324 * 2325 * Linux itself doesn't use 1:N distribution, so has no need to 2326 * set PMHE. The only reason to have it set is if EL3 requires it 2327 * (and we can't change it). 2328 */ 2329 return (gic_read_ctlr() & ICC_CTLR_EL1_PMHE_MASK) == 0; 2330 } 2331 #endif 2332 2333 #ifdef CONFIG_ARM64_BTI 2334 static void bti_enable(const struct arm64_cpu_capabilities *__unused) 2335 { 2336 /* 2337 * Use of X16/X17 for tail-calls and trampolines that jump to 2338 * function entry points using BR is a requirement for 2339 * marking binaries with GNU_PROPERTY_AARCH64_FEATURE_1_BTI. 2340 * So, be strict and forbid other BRs using other registers to 2341 * jump onto a PACIxSP instruction: 2342 */ 2343 sysreg_clear_set(sctlr_el1, 0, SCTLR_EL1_BT0 | SCTLR_EL1_BT1); 2344 isb(); 2345 } 2346 #endif /* CONFIG_ARM64_BTI */ 2347 2348 #ifdef CONFIG_ARM64_MTE 2349 static void cpu_enable_mte(struct arm64_cpu_capabilities const *cap) 2350 { 2351 sysreg_clear_set(sctlr_el1, 0, SCTLR_ELx_ATA | SCTLR_EL1_ATA0); 2352 2353 mte_cpu_setup(); 2354 2355 /* 2356 * Clear the tags in the zero page. This needs to be done via the 2357 * linear map which has the Tagged attribute. 2358 */ 2359 if (try_page_mte_tagging(ZERO_PAGE(0))) { 2360 mte_clear_page_tags(lm_alias(empty_zero_page)); 2361 set_page_mte_tagged(ZERO_PAGE(0)); 2362 } 2363 2364 kasan_init_hw_tags_cpu(); 2365 } 2366 #endif /* CONFIG_ARM64_MTE */ 2367 2368 static void user_feature_fixup(void) 2369 { 2370 if (cpus_have_cap(ARM64_WORKAROUND_2658417)) { 2371 struct arm64_ftr_reg *regp; 2372 2373 regp = get_arm64_ftr_reg(SYS_ID_AA64ISAR1_EL1); 2374 if (regp) 2375 regp->user_mask &= ~ID_AA64ISAR1_EL1_BF16_MASK; 2376 } 2377 2378 if (cpus_have_cap(ARM64_WORKAROUND_SPECULATIVE_SSBS)) { 2379 struct arm64_ftr_reg *regp; 2380 2381 regp = get_arm64_ftr_reg(SYS_ID_AA64PFR1_EL1); 2382 if (regp) 2383 regp->user_mask &= ~ID_AA64PFR1_EL1_SSBS_MASK; 2384 } 2385 } 2386 2387 static void elf_hwcap_fixup(void) 2388 { 2389 #ifdef CONFIG_COMPAT 2390 if (cpus_have_cap(ARM64_WORKAROUND_1742098)) 2391 compat_elf_hwcap2 &= ~COMPAT_HWCAP2_AES; 2392 #endif /* CONFIG_COMPAT */ 2393 } 2394 2395 #ifdef CONFIG_KVM 2396 static bool is_kvm_protected_mode(const struct arm64_cpu_capabilities *entry, int __unused) 2397 { 2398 return kvm_get_mode() == KVM_MODE_PROTECTED; 2399 } 2400 #endif /* CONFIG_KVM */ 2401 2402 static void cpu_trap_el0_impdef(const struct arm64_cpu_capabilities *__unused) 2403 { 2404 sysreg_clear_set(sctlr_el1, 0, SCTLR_EL1_TIDCP); 2405 } 2406 2407 static void cpu_enable_dit(const struct arm64_cpu_capabilities *__unused) 2408 { 2409 set_pstate_dit(1); 2410 } 2411 2412 static void cpu_enable_mops(const struct arm64_cpu_capabilities *__unused) 2413 { 2414 sysreg_clear_set(sctlr_el1, 0, SCTLR_EL1_MSCEn); 2415 } 2416 2417 #ifdef CONFIG_ARM64_POE 2418 static void cpu_enable_poe(const struct arm64_cpu_capabilities *__unused) 2419 { 2420 sysreg_clear_set(REG_TCR2_EL1, 0, TCR2_EL1_E0POE); 2421 sysreg_clear_set(CPACR_EL1, 0, CPACR_EL1_E0POE); 2422 } 2423 #endif 2424 2425 #ifdef CONFIG_ARM64_GCS 2426 static void cpu_enable_gcs(const struct arm64_cpu_capabilities *__unused) 2427 { 2428 /* GCSPR_EL0 is always readable */ 2429 write_sysreg_s(GCSCRE0_EL1_nTR, SYS_GCSCRE0_EL1); 2430 } 2431 #endif 2432 2433 /* Internal helper functions to match cpu capability type */ 2434 static bool 2435 cpucap_late_cpu_optional(const struct arm64_cpu_capabilities *cap) 2436 { 2437 return !!(cap->type & ARM64_CPUCAP_OPTIONAL_FOR_LATE_CPU); 2438 } 2439 2440 static bool 2441 cpucap_late_cpu_permitted(const struct arm64_cpu_capabilities *cap) 2442 { 2443 return !!(cap->type & ARM64_CPUCAP_PERMITTED_FOR_LATE_CPU); 2444 } 2445 2446 static bool 2447 cpucap_panic_on_conflict(const struct arm64_cpu_capabilities *cap) 2448 { 2449 return !!(cap->type & ARM64_CPUCAP_PANIC_ON_CONFLICT); 2450 } 2451 2452 static bool 2453 test_has_mpam(const struct arm64_cpu_capabilities *entry, int scope) 2454 { 2455 if (!has_cpuid_feature(entry, scope)) 2456 return false; 2457 2458 /* Check firmware actually enabled MPAM on this cpu. */ 2459 return (read_sysreg_s(SYS_MPAM1_EL1) & MPAM1_EL1_MPAMEN); 2460 } 2461 2462 static void 2463 cpu_enable_mpam(const struct arm64_cpu_capabilities *entry) 2464 { 2465 /* 2466 * Access by the kernel (at EL1) should use the reserved PARTID 2467 * which is configured unrestricted. This avoids priority-inversion 2468 * where latency sensitive tasks have to wait for a task that has 2469 * been throttled to release the lock. 2470 */ 2471 write_sysreg_s(0, SYS_MPAM1_EL1); 2472 } 2473 2474 static bool 2475 test_has_mpam_hcr(const struct arm64_cpu_capabilities *entry, int scope) 2476 { 2477 u64 idr = read_sanitised_ftr_reg(SYS_MPAMIDR_EL1); 2478 2479 return idr & MPAMIDR_EL1_HAS_HCR; 2480 } 2481 2482 static const struct arm64_cpu_capabilities arm64_features[] = { 2483 { 2484 .capability = ARM64_ALWAYS_BOOT, 2485 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 2486 .matches = has_always, 2487 }, 2488 { 2489 .capability = ARM64_ALWAYS_SYSTEM, 2490 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2491 .matches = has_always, 2492 }, 2493 { 2494 .desc = "GIC system register CPU interface", 2495 .capability = ARM64_HAS_GIC_CPUIF_SYSREGS, 2496 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, 2497 .matches = has_useable_gicv3_cpuif, 2498 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, GIC, IMP) 2499 }, 2500 { 2501 .desc = "Enhanced Counter Virtualization", 2502 .capability = ARM64_HAS_ECV, 2503 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2504 .matches = has_cpuid_feature, 2505 ARM64_CPUID_FIELDS(ID_AA64MMFR0_EL1, ECV, IMP) 2506 }, 2507 { 2508 .desc = "Enhanced Counter Virtualization (CNTPOFF)", 2509 .capability = ARM64_HAS_ECV_CNTPOFF, 2510 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2511 .matches = has_cpuid_feature, 2512 ARM64_CPUID_FIELDS(ID_AA64MMFR0_EL1, ECV, CNTPOFF) 2513 }, 2514 #ifdef CONFIG_ARM64_PAN 2515 { 2516 .desc = "Privileged Access Never", 2517 .capability = ARM64_HAS_PAN, 2518 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2519 .matches = has_cpuid_feature, 2520 .cpu_enable = cpu_enable_pan, 2521 ARM64_CPUID_FIELDS(ID_AA64MMFR1_EL1, PAN, IMP) 2522 }, 2523 #endif /* CONFIG_ARM64_PAN */ 2524 #ifdef CONFIG_ARM64_EPAN 2525 { 2526 .desc = "Enhanced Privileged Access Never", 2527 .capability = ARM64_HAS_EPAN, 2528 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2529 .matches = has_cpuid_feature, 2530 ARM64_CPUID_FIELDS(ID_AA64MMFR1_EL1, PAN, PAN3) 2531 }, 2532 #endif /* CONFIG_ARM64_EPAN */ 2533 #ifdef CONFIG_ARM64_LSE_ATOMICS 2534 { 2535 .desc = "LSE atomic instructions", 2536 .capability = ARM64_HAS_LSE_ATOMICS, 2537 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2538 .matches = has_cpuid_feature, 2539 ARM64_CPUID_FIELDS(ID_AA64ISAR0_EL1, ATOMIC, IMP) 2540 }, 2541 #endif /* CONFIG_ARM64_LSE_ATOMICS */ 2542 { 2543 .desc = "Virtualization Host Extensions", 2544 .capability = ARM64_HAS_VIRT_HOST_EXTN, 2545 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, 2546 .matches = runs_at_el2, 2547 .cpu_enable = cpu_copy_el2regs, 2548 }, 2549 { 2550 .desc = "Nested Virtualization Support", 2551 .capability = ARM64_HAS_NESTED_VIRT, 2552 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2553 .matches = has_nested_virt_support, 2554 .match_list = (const struct arm64_cpu_capabilities []){ 2555 { 2556 .matches = has_cpuid_feature, 2557 ARM64_CPUID_FIELDS(ID_AA64MMFR2_EL1, NV, NV2) 2558 }, 2559 { 2560 .matches = has_cpuid_feature, 2561 ARM64_CPUID_FIELDS(ID_AA64MMFR4_EL1, NV_frac, NV2_ONLY) 2562 }, 2563 { /* Sentinel */ } 2564 }, 2565 }, 2566 { 2567 .capability = ARM64_HAS_32BIT_EL0_DO_NOT_USE, 2568 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2569 .matches = has_32bit_el0, 2570 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, EL0, AARCH32) 2571 }, 2572 #ifdef CONFIG_KVM 2573 { 2574 .desc = "32-bit EL1 Support", 2575 .capability = ARM64_HAS_32BIT_EL1, 2576 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2577 .matches = has_cpuid_feature, 2578 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, EL1, AARCH32) 2579 }, 2580 { 2581 .desc = "Protected KVM", 2582 .capability = ARM64_KVM_PROTECTED_MODE, 2583 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2584 .matches = is_kvm_protected_mode, 2585 }, 2586 { 2587 .desc = "HCRX_EL2 register", 2588 .capability = ARM64_HAS_HCX, 2589 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, 2590 .matches = has_cpuid_feature, 2591 ARM64_CPUID_FIELDS(ID_AA64MMFR1_EL1, HCX, IMP) 2592 }, 2593 #endif 2594 { 2595 .desc = "Kernel page table isolation (KPTI)", 2596 .capability = ARM64_UNMAP_KERNEL_AT_EL0, 2597 .type = ARM64_CPUCAP_BOOT_RESTRICTED_CPU_LOCAL_FEATURE, 2598 .cpu_enable = cpu_enable_kpti, 2599 .matches = unmap_kernel_at_el0, 2600 /* 2601 * The ID feature fields below are used to indicate that 2602 * the CPU doesn't need KPTI. See unmap_kernel_at_el0 for 2603 * more details. 2604 */ 2605 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, CSV3, IMP) 2606 }, 2607 { 2608 .capability = ARM64_HAS_FPSIMD, 2609 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2610 .matches = has_cpuid_feature, 2611 .cpu_enable = cpu_enable_fpsimd, 2612 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, FP, IMP) 2613 }, 2614 #ifdef CONFIG_ARM64_PMEM 2615 { 2616 .desc = "Data cache clean to Point of Persistence", 2617 .capability = ARM64_HAS_DCPOP, 2618 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2619 .matches = has_cpuid_feature, 2620 ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, DPB, IMP) 2621 }, 2622 { 2623 .desc = "Data cache clean to Point of Deep Persistence", 2624 .capability = ARM64_HAS_DCPODP, 2625 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2626 .matches = has_cpuid_feature, 2627 ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, DPB, DPB2) 2628 }, 2629 #endif 2630 #ifdef CONFIG_ARM64_SVE 2631 { 2632 .desc = "Scalable Vector Extension", 2633 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2634 .capability = ARM64_SVE, 2635 .cpu_enable = cpu_enable_sve, 2636 .matches = has_cpuid_feature, 2637 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, SVE, IMP) 2638 }, 2639 #endif /* CONFIG_ARM64_SVE */ 2640 #ifdef CONFIG_ARM64_RAS_EXTN 2641 { 2642 .desc = "RAS Extension Support", 2643 .capability = ARM64_HAS_RAS_EXTN, 2644 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2645 .matches = has_cpuid_feature, 2646 .cpu_enable = cpu_clear_disr, 2647 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, RAS, IMP) 2648 }, 2649 #endif /* CONFIG_ARM64_RAS_EXTN */ 2650 #ifdef CONFIG_ARM64_AMU_EXTN 2651 { 2652 .desc = "Activity Monitors Unit (AMU)", 2653 .capability = ARM64_HAS_AMU_EXTN, 2654 .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE, 2655 .matches = has_amu, 2656 .cpu_enable = cpu_amu_enable, 2657 .cpus = &amu_cpus, 2658 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, AMU, IMP) 2659 }, 2660 #endif /* CONFIG_ARM64_AMU_EXTN */ 2661 { 2662 .desc = "Data cache clean to the PoU not required for I/D coherence", 2663 .capability = ARM64_HAS_CACHE_IDC, 2664 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2665 .matches = has_cache_idc, 2666 .cpu_enable = cpu_emulate_effective_ctr, 2667 }, 2668 { 2669 .desc = "Instruction cache invalidation not required for I/D coherence", 2670 .capability = ARM64_HAS_CACHE_DIC, 2671 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2672 .matches = has_cache_dic, 2673 }, 2674 { 2675 .desc = "Stage-2 Force Write-Back", 2676 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2677 .capability = ARM64_HAS_STAGE2_FWB, 2678 .matches = has_cpuid_feature, 2679 ARM64_CPUID_FIELDS(ID_AA64MMFR2_EL1, FWB, IMP) 2680 }, 2681 { 2682 .desc = "ARMv8.4 Translation Table Level", 2683 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2684 .capability = ARM64_HAS_ARMv8_4_TTL, 2685 .matches = has_cpuid_feature, 2686 ARM64_CPUID_FIELDS(ID_AA64MMFR2_EL1, TTL, IMP) 2687 }, 2688 { 2689 .desc = "TLB range maintenance instructions", 2690 .capability = ARM64_HAS_TLB_RANGE, 2691 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2692 .matches = has_cpuid_feature, 2693 ARM64_CPUID_FIELDS(ID_AA64ISAR0_EL1, TLB, RANGE) 2694 }, 2695 #ifdef CONFIG_ARM64_HW_AFDBM 2696 { 2697 .desc = "Hardware dirty bit management", 2698 .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE, 2699 .capability = ARM64_HW_DBM, 2700 .matches = has_hw_dbm, 2701 .cpu_enable = cpu_enable_hw_dbm, 2702 .cpus = &dbm_cpus, 2703 ARM64_CPUID_FIELDS(ID_AA64MMFR1_EL1, HAFDBS, DBM) 2704 }, 2705 #endif 2706 #ifdef CONFIG_ARM64_HAFT 2707 { 2708 .desc = "Hardware managed Access Flag for Table Descriptors", 2709 /* 2710 * Contrary to the page/block access flag, the table access flag 2711 * cannot be emulated in software (no access fault will occur). 2712 * Therefore this should be used only if it's supported system 2713 * wide. 2714 */ 2715 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2716 .capability = ARM64_HAFT, 2717 .matches = has_cpuid_feature, 2718 ARM64_CPUID_FIELDS(ID_AA64MMFR1_EL1, HAFDBS, HAFT) 2719 }, 2720 #endif 2721 { 2722 .desc = "CRC32 instructions", 2723 .capability = ARM64_HAS_CRC32, 2724 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2725 .matches = has_cpuid_feature, 2726 ARM64_CPUID_FIELDS(ID_AA64ISAR0_EL1, CRC32, IMP) 2727 }, 2728 { 2729 .desc = "Speculative Store Bypassing Safe (SSBS)", 2730 .capability = ARM64_SSBS, 2731 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2732 .matches = has_cpuid_feature, 2733 ARM64_CPUID_FIELDS(ID_AA64PFR1_EL1, SSBS, IMP) 2734 }, 2735 #ifdef CONFIG_ARM64_CNP 2736 { 2737 .desc = "Common not Private translations", 2738 .capability = ARM64_HAS_CNP, 2739 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2740 .matches = has_useable_cnp, 2741 .cpu_enable = cpu_enable_cnp, 2742 ARM64_CPUID_FIELDS(ID_AA64MMFR2_EL1, CnP, IMP) 2743 }, 2744 #endif 2745 { 2746 .desc = "Speculation barrier (SB)", 2747 .capability = ARM64_HAS_SB, 2748 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2749 .matches = has_cpuid_feature, 2750 ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, SB, IMP) 2751 }, 2752 #ifdef CONFIG_ARM64_PTR_AUTH 2753 { 2754 .desc = "Address authentication (architected QARMA5 algorithm)", 2755 .capability = ARM64_HAS_ADDRESS_AUTH_ARCH_QARMA5, 2756 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 2757 .matches = has_address_auth_cpucap, 2758 ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, APA, PAuth) 2759 }, 2760 { 2761 .desc = "Address authentication (architected QARMA3 algorithm)", 2762 .capability = ARM64_HAS_ADDRESS_AUTH_ARCH_QARMA3, 2763 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 2764 .matches = has_address_auth_cpucap, 2765 ARM64_CPUID_FIELDS(ID_AA64ISAR2_EL1, APA3, PAuth) 2766 }, 2767 { 2768 .desc = "Address authentication (IMP DEF algorithm)", 2769 .capability = ARM64_HAS_ADDRESS_AUTH_IMP_DEF, 2770 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 2771 .matches = has_address_auth_cpucap, 2772 ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, API, PAuth) 2773 }, 2774 { 2775 .capability = ARM64_HAS_ADDRESS_AUTH, 2776 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 2777 .matches = has_address_auth_metacap, 2778 }, 2779 { 2780 .desc = "Generic authentication (architected QARMA5 algorithm)", 2781 .capability = ARM64_HAS_GENERIC_AUTH_ARCH_QARMA5, 2782 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2783 .matches = has_cpuid_feature, 2784 ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, GPA, IMP) 2785 }, 2786 { 2787 .desc = "Generic authentication (architected QARMA3 algorithm)", 2788 .capability = ARM64_HAS_GENERIC_AUTH_ARCH_QARMA3, 2789 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2790 .matches = has_cpuid_feature, 2791 ARM64_CPUID_FIELDS(ID_AA64ISAR2_EL1, GPA3, IMP) 2792 }, 2793 { 2794 .desc = "Generic authentication (IMP DEF algorithm)", 2795 .capability = ARM64_HAS_GENERIC_AUTH_IMP_DEF, 2796 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2797 .matches = has_cpuid_feature, 2798 ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, GPI, IMP) 2799 }, 2800 { 2801 .capability = ARM64_HAS_GENERIC_AUTH, 2802 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2803 .matches = has_generic_auth, 2804 }, 2805 #endif /* CONFIG_ARM64_PTR_AUTH */ 2806 #ifdef CONFIG_ARM64_PSEUDO_NMI 2807 { 2808 /* 2809 * Depends on having GICv3 2810 */ 2811 .desc = "IRQ priority masking", 2812 .capability = ARM64_HAS_GIC_PRIO_MASKING, 2813 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, 2814 .matches = can_use_gic_priorities, 2815 }, 2816 { 2817 /* 2818 * Depends on ARM64_HAS_GIC_PRIO_MASKING 2819 */ 2820 .capability = ARM64_HAS_GIC_PRIO_RELAXED_SYNC, 2821 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, 2822 .matches = has_gic_prio_relaxed_sync, 2823 }, 2824 #endif 2825 #ifdef CONFIG_ARM64_E0PD 2826 { 2827 .desc = "E0PD", 2828 .capability = ARM64_HAS_E0PD, 2829 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2830 .cpu_enable = cpu_enable_e0pd, 2831 .matches = has_cpuid_feature, 2832 ARM64_CPUID_FIELDS(ID_AA64MMFR2_EL1, E0PD, IMP) 2833 }, 2834 #endif 2835 { 2836 .desc = "Random Number Generator", 2837 .capability = ARM64_HAS_RNG, 2838 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2839 .matches = has_cpuid_feature, 2840 ARM64_CPUID_FIELDS(ID_AA64ISAR0_EL1, RNDR, IMP) 2841 }, 2842 #ifdef CONFIG_ARM64_BTI 2843 { 2844 .desc = "Branch Target Identification", 2845 .capability = ARM64_BTI, 2846 #ifdef CONFIG_ARM64_BTI_KERNEL 2847 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, 2848 #else 2849 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2850 #endif 2851 .matches = has_cpuid_feature, 2852 .cpu_enable = bti_enable, 2853 ARM64_CPUID_FIELDS(ID_AA64PFR1_EL1, BT, IMP) 2854 }, 2855 #endif 2856 #ifdef CONFIG_ARM64_MTE 2857 { 2858 .desc = "Memory Tagging Extension", 2859 .capability = ARM64_MTE, 2860 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, 2861 .matches = has_cpuid_feature, 2862 .cpu_enable = cpu_enable_mte, 2863 ARM64_CPUID_FIELDS(ID_AA64PFR1_EL1, MTE, MTE2) 2864 }, 2865 { 2866 .desc = "Asymmetric MTE Tag Check Fault", 2867 .capability = ARM64_MTE_ASYMM, 2868 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 2869 .matches = has_cpuid_feature, 2870 ARM64_CPUID_FIELDS(ID_AA64PFR1_EL1, MTE, MTE3) 2871 }, 2872 #endif /* CONFIG_ARM64_MTE */ 2873 { 2874 .desc = "RCpc load-acquire (LDAPR)", 2875 .capability = ARM64_HAS_LDAPR, 2876 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2877 .matches = has_cpuid_feature, 2878 ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, LRCPC, IMP) 2879 }, 2880 { 2881 .desc = "Fine Grained Traps", 2882 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2883 .capability = ARM64_HAS_FGT, 2884 .matches = has_cpuid_feature, 2885 ARM64_CPUID_FIELDS(ID_AA64MMFR0_EL1, FGT, IMP) 2886 }, 2887 { 2888 .desc = "Fine Grained Traps 2", 2889 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2890 .capability = ARM64_HAS_FGT2, 2891 .matches = has_cpuid_feature, 2892 ARM64_CPUID_FIELDS(ID_AA64MMFR0_EL1, FGT, FGT2) 2893 }, 2894 #ifdef CONFIG_ARM64_SME 2895 { 2896 .desc = "Scalable Matrix Extension", 2897 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2898 .capability = ARM64_SME, 2899 .matches = has_cpuid_feature, 2900 .cpu_enable = cpu_enable_sme, 2901 ARM64_CPUID_FIELDS(ID_AA64PFR1_EL1, SME, IMP) 2902 }, 2903 /* FA64 should be sorted after the base SME capability */ 2904 { 2905 .desc = "FA64", 2906 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2907 .capability = ARM64_SME_FA64, 2908 .matches = has_cpuid_feature, 2909 .cpu_enable = cpu_enable_fa64, 2910 ARM64_CPUID_FIELDS(ID_AA64SMFR0_EL1, FA64, IMP) 2911 }, 2912 { 2913 .desc = "SME2", 2914 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2915 .capability = ARM64_SME2, 2916 .matches = has_cpuid_feature, 2917 .cpu_enable = cpu_enable_sme2, 2918 ARM64_CPUID_FIELDS(ID_AA64PFR1_EL1, SME, SME2) 2919 }, 2920 #endif /* CONFIG_ARM64_SME */ 2921 { 2922 .desc = "WFx with timeout", 2923 .capability = ARM64_HAS_WFXT, 2924 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2925 .matches = has_cpuid_feature, 2926 ARM64_CPUID_FIELDS(ID_AA64ISAR2_EL1, WFxT, IMP) 2927 }, 2928 { 2929 .desc = "Trap EL0 IMPLEMENTATION DEFINED functionality", 2930 .capability = ARM64_HAS_TIDCP1, 2931 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2932 .matches = has_cpuid_feature, 2933 .cpu_enable = cpu_trap_el0_impdef, 2934 ARM64_CPUID_FIELDS(ID_AA64MMFR1_EL1, TIDCP1, IMP) 2935 }, 2936 { 2937 .desc = "Data independent timing control (DIT)", 2938 .capability = ARM64_HAS_DIT, 2939 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2940 .matches = has_cpuid_feature, 2941 .cpu_enable = cpu_enable_dit, 2942 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, DIT, IMP) 2943 }, 2944 { 2945 .desc = "Memory Copy and Memory Set instructions", 2946 .capability = ARM64_HAS_MOPS, 2947 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2948 .matches = has_cpuid_feature, 2949 .cpu_enable = cpu_enable_mops, 2950 ARM64_CPUID_FIELDS(ID_AA64ISAR2_EL1, MOPS, IMP) 2951 }, 2952 { 2953 .capability = ARM64_HAS_TCR2, 2954 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2955 .matches = has_cpuid_feature, 2956 ARM64_CPUID_FIELDS(ID_AA64MMFR3_EL1, TCRX, IMP) 2957 }, 2958 { 2959 .desc = "Stage-1 Permission Indirection Extension (S1PIE)", 2960 .capability = ARM64_HAS_S1PIE, 2961 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 2962 .matches = has_cpuid_feature, 2963 ARM64_CPUID_FIELDS(ID_AA64MMFR3_EL1, S1PIE, IMP) 2964 }, 2965 { 2966 .desc = "VHE for hypervisor only", 2967 .capability = ARM64_KVM_HVHE, 2968 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2969 .matches = hvhe_possible, 2970 }, 2971 { 2972 .desc = "Enhanced Virtualization Traps", 2973 .capability = ARM64_HAS_EVT, 2974 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2975 .matches = has_cpuid_feature, 2976 ARM64_CPUID_FIELDS(ID_AA64MMFR2_EL1, EVT, IMP) 2977 }, 2978 { 2979 .desc = "52-bit Virtual Addressing for KVM (LPA2)", 2980 .capability = ARM64_HAS_LPA2, 2981 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2982 .matches = has_lpa2, 2983 }, 2984 { 2985 .desc = "FPMR", 2986 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2987 .capability = ARM64_HAS_FPMR, 2988 .matches = has_cpuid_feature, 2989 .cpu_enable = cpu_enable_fpmr, 2990 ARM64_CPUID_FIELDS(ID_AA64PFR2_EL1, FPMR, IMP) 2991 }, 2992 #ifdef CONFIG_ARM64_VA_BITS_52 2993 { 2994 .capability = ARM64_HAS_VA52, 2995 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 2996 .matches = has_cpuid_feature, 2997 #ifdef CONFIG_ARM64_64K_PAGES 2998 .desc = "52-bit Virtual Addressing (LVA)", 2999 ARM64_CPUID_FIELDS(ID_AA64MMFR2_EL1, VARange, 52) 3000 #else 3001 .desc = "52-bit Virtual Addressing (LPA2)", 3002 #ifdef CONFIG_ARM64_4K_PAGES 3003 ARM64_CPUID_FIELDS(ID_AA64MMFR0_EL1, TGRAN4, 52_BIT) 3004 #else 3005 ARM64_CPUID_FIELDS(ID_AA64MMFR0_EL1, TGRAN16, 52_BIT) 3006 #endif 3007 #endif 3008 }, 3009 #endif 3010 { 3011 .desc = "Memory Partitioning And Monitoring", 3012 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3013 .capability = ARM64_MPAM, 3014 .matches = test_has_mpam, 3015 .cpu_enable = cpu_enable_mpam, 3016 ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, MPAM, 1) 3017 }, 3018 { 3019 .desc = "Memory Partitioning And Monitoring Virtualisation", 3020 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3021 .capability = ARM64_MPAM_HCR, 3022 .matches = test_has_mpam_hcr, 3023 }, 3024 { 3025 .desc = "NV1", 3026 .capability = ARM64_HAS_HCR_NV1, 3027 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3028 .matches = has_nv1, 3029 ARM64_CPUID_FIELDS_NEG(ID_AA64MMFR4_EL1, E2H0, NI_NV1) 3030 }, 3031 #ifdef CONFIG_ARM64_POE 3032 { 3033 .desc = "Stage-1 Permission Overlay Extension (S1POE)", 3034 .capability = ARM64_HAS_S1POE, 3035 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 3036 .matches = has_cpuid_feature, 3037 .cpu_enable = cpu_enable_poe, 3038 ARM64_CPUID_FIELDS(ID_AA64MMFR3_EL1, S1POE, IMP) 3039 }, 3040 #endif 3041 #ifdef CONFIG_ARM64_GCS 3042 { 3043 .desc = "Guarded Control Stack (GCS)", 3044 .capability = ARM64_HAS_GCS, 3045 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3046 .cpu_enable = cpu_enable_gcs, 3047 .matches = has_cpuid_feature, 3048 ARM64_CPUID_FIELDS(ID_AA64PFR1_EL1, GCS, IMP) 3049 }, 3050 #endif 3051 #ifdef CONFIG_HW_PERF_EVENTS 3052 { 3053 .desc = "PMUv3", 3054 .capability = ARM64_HAS_PMUV3, 3055 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 3056 .matches = has_pmuv3, 3057 }, 3058 #endif 3059 {}, 3060 }; 3061 3062 #define HWCAP_CPUID_MATCH(reg, field, min_value) \ 3063 .matches = has_user_cpuid_feature, \ 3064 ARM64_CPUID_FIELDS(reg, field, min_value) 3065 3066 #define __HWCAP_CAP(name, cap_type, cap) \ 3067 .desc = name, \ 3068 .type = ARM64_CPUCAP_SYSTEM_FEATURE, \ 3069 .hwcap_type = cap_type, \ 3070 .hwcap = cap, \ 3071 3072 #define HWCAP_CAP(reg, field, min_value, cap_type, cap) \ 3073 { \ 3074 __HWCAP_CAP(#cap, cap_type, cap) \ 3075 HWCAP_CPUID_MATCH(reg, field, min_value) \ 3076 } 3077 3078 #define HWCAP_MULTI_CAP(list, cap_type, cap) \ 3079 { \ 3080 __HWCAP_CAP(#cap, cap_type, cap) \ 3081 .matches = cpucap_multi_entry_cap_matches, \ 3082 .match_list = list, \ 3083 } 3084 3085 #define HWCAP_CAP_MATCH(match, cap_type, cap) \ 3086 { \ 3087 __HWCAP_CAP(#cap, cap_type, cap) \ 3088 .matches = match, \ 3089 } 3090 3091 #define HWCAP_CAP_MATCH_ID(match, reg, field, min_value, cap_type, cap) \ 3092 { \ 3093 __HWCAP_CAP(#cap, cap_type, cap) \ 3094 HWCAP_CPUID_MATCH(reg, field, min_value) \ 3095 .matches = match, \ 3096 } 3097 3098 #ifdef CONFIG_ARM64_PTR_AUTH 3099 static const struct arm64_cpu_capabilities ptr_auth_hwcap_addr_matches[] = { 3100 { 3101 HWCAP_CPUID_MATCH(ID_AA64ISAR1_EL1, APA, PAuth) 3102 }, 3103 { 3104 HWCAP_CPUID_MATCH(ID_AA64ISAR2_EL1, APA3, PAuth) 3105 }, 3106 { 3107 HWCAP_CPUID_MATCH(ID_AA64ISAR1_EL1, API, PAuth) 3108 }, 3109 {}, 3110 }; 3111 3112 static const struct arm64_cpu_capabilities ptr_auth_hwcap_gen_matches[] = { 3113 { 3114 HWCAP_CPUID_MATCH(ID_AA64ISAR1_EL1, GPA, IMP) 3115 }, 3116 { 3117 HWCAP_CPUID_MATCH(ID_AA64ISAR2_EL1, GPA3, IMP) 3118 }, 3119 { 3120 HWCAP_CPUID_MATCH(ID_AA64ISAR1_EL1, GPI, IMP) 3121 }, 3122 {}, 3123 }; 3124 #endif 3125 3126 #ifdef CONFIG_ARM64_SVE 3127 static bool has_sve_feature(const struct arm64_cpu_capabilities *cap, int scope) 3128 { 3129 return system_supports_sve() && has_user_cpuid_feature(cap, scope); 3130 } 3131 #endif 3132 3133 static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = { 3134 HWCAP_CAP(ID_AA64ISAR0_EL1, AES, PMULL, CAP_HWCAP, KERNEL_HWCAP_PMULL), 3135 HWCAP_CAP(ID_AA64ISAR0_EL1, AES, AES, CAP_HWCAP, KERNEL_HWCAP_AES), 3136 HWCAP_CAP(ID_AA64ISAR0_EL1, SHA1, IMP, CAP_HWCAP, KERNEL_HWCAP_SHA1), 3137 HWCAP_CAP(ID_AA64ISAR0_EL1, SHA2, SHA256, CAP_HWCAP, KERNEL_HWCAP_SHA2), 3138 HWCAP_CAP(ID_AA64ISAR0_EL1, SHA2, SHA512, CAP_HWCAP, KERNEL_HWCAP_SHA512), 3139 HWCAP_CAP(ID_AA64ISAR0_EL1, CRC32, IMP, CAP_HWCAP, KERNEL_HWCAP_CRC32), 3140 HWCAP_CAP(ID_AA64ISAR0_EL1, ATOMIC, IMP, CAP_HWCAP, KERNEL_HWCAP_ATOMICS), 3141 HWCAP_CAP(ID_AA64ISAR0_EL1, ATOMIC, FEAT_LSE128, CAP_HWCAP, KERNEL_HWCAP_LSE128), 3142 HWCAP_CAP(ID_AA64ISAR0_EL1, RDM, IMP, CAP_HWCAP, KERNEL_HWCAP_ASIMDRDM), 3143 HWCAP_CAP(ID_AA64ISAR0_EL1, SHA3, IMP, CAP_HWCAP, KERNEL_HWCAP_SHA3), 3144 HWCAP_CAP(ID_AA64ISAR0_EL1, SM3, IMP, CAP_HWCAP, KERNEL_HWCAP_SM3), 3145 HWCAP_CAP(ID_AA64ISAR0_EL1, SM4, IMP, CAP_HWCAP, KERNEL_HWCAP_SM4), 3146 HWCAP_CAP(ID_AA64ISAR0_EL1, DP, IMP, CAP_HWCAP, KERNEL_HWCAP_ASIMDDP), 3147 HWCAP_CAP(ID_AA64ISAR0_EL1, FHM, IMP, CAP_HWCAP, KERNEL_HWCAP_ASIMDFHM), 3148 HWCAP_CAP(ID_AA64ISAR0_EL1, TS, FLAGM, CAP_HWCAP, KERNEL_HWCAP_FLAGM), 3149 HWCAP_CAP(ID_AA64ISAR0_EL1, TS, FLAGM2, CAP_HWCAP, KERNEL_HWCAP_FLAGM2), 3150 HWCAP_CAP(ID_AA64ISAR0_EL1, RNDR, IMP, CAP_HWCAP, KERNEL_HWCAP_RNG), 3151 HWCAP_CAP(ID_AA64ISAR3_EL1, FPRCVT, IMP, CAP_HWCAP, KERNEL_HWCAP_FPRCVT), 3152 HWCAP_CAP(ID_AA64PFR0_EL1, FP, IMP, CAP_HWCAP, KERNEL_HWCAP_FP), 3153 HWCAP_CAP(ID_AA64PFR0_EL1, FP, FP16, CAP_HWCAP, KERNEL_HWCAP_FPHP), 3154 HWCAP_CAP(ID_AA64PFR0_EL1, AdvSIMD, IMP, CAP_HWCAP, KERNEL_HWCAP_ASIMD), 3155 HWCAP_CAP(ID_AA64PFR0_EL1, AdvSIMD, FP16, CAP_HWCAP, KERNEL_HWCAP_ASIMDHP), 3156 HWCAP_CAP(ID_AA64PFR0_EL1, DIT, IMP, CAP_HWCAP, KERNEL_HWCAP_DIT), 3157 HWCAP_CAP(ID_AA64PFR2_EL1, FPMR, IMP, CAP_HWCAP, KERNEL_HWCAP_FPMR), 3158 HWCAP_CAP(ID_AA64ISAR1_EL1, DPB, IMP, CAP_HWCAP, KERNEL_HWCAP_DCPOP), 3159 HWCAP_CAP(ID_AA64ISAR1_EL1, DPB, DPB2, CAP_HWCAP, KERNEL_HWCAP_DCPODP), 3160 HWCAP_CAP(ID_AA64ISAR1_EL1, JSCVT, IMP, CAP_HWCAP, KERNEL_HWCAP_JSCVT), 3161 HWCAP_CAP(ID_AA64ISAR1_EL1, FCMA, IMP, CAP_HWCAP, KERNEL_HWCAP_FCMA), 3162 HWCAP_CAP(ID_AA64ISAR1_EL1, LRCPC, IMP, CAP_HWCAP, KERNEL_HWCAP_LRCPC), 3163 HWCAP_CAP(ID_AA64ISAR1_EL1, LRCPC, LRCPC2, CAP_HWCAP, KERNEL_HWCAP_ILRCPC), 3164 HWCAP_CAP(ID_AA64ISAR1_EL1, LRCPC, LRCPC3, CAP_HWCAP, KERNEL_HWCAP_LRCPC3), 3165 HWCAP_CAP(ID_AA64ISAR1_EL1, FRINTTS, IMP, CAP_HWCAP, KERNEL_HWCAP_FRINT), 3166 HWCAP_CAP(ID_AA64ISAR1_EL1, SB, IMP, CAP_HWCAP, KERNEL_HWCAP_SB), 3167 HWCAP_CAP(ID_AA64ISAR1_EL1, BF16, IMP, CAP_HWCAP, KERNEL_HWCAP_BF16), 3168 HWCAP_CAP(ID_AA64ISAR1_EL1, BF16, EBF16, CAP_HWCAP, KERNEL_HWCAP_EBF16), 3169 HWCAP_CAP(ID_AA64ISAR1_EL1, DGH, IMP, CAP_HWCAP, KERNEL_HWCAP_DGH), 3170 HWCAP_CAP(ID_AA64ISAR1_EL1, I8MM, IMP, CAP_HWCAP, KERNEL_HWCAP_I8MM), 3171 HWCAP_CAP(ID_AA64ISAR2_EL1, LUT, IMP, CAP_HWCAP, KERNEL_HWCAP_LUT), 3172 HWCAP_CAP(ID_AA64ISAR3_EL1, FAMINMAX, IMP, CAP_HWCAP, KERNEL_HWCAP_FAMINMAX), 3173 HWCAP_CAP(ID_AA64MMFR2_EL1, AT, IMP, CAP_HWCAP, KERNEL_HWCAP_USCAT), 3174 #ifdef CONFIG_ARM64_SVE 3175 HWCAP_CAP(ID_AA64PFR0_EL1, SVE, IMP, CAP_HWCAP, KERNEL_HWCAP_SVE), 3176 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, SVEver, SVE2p2, CAP_HWCAP, KERNEL_HWCAP_SVE2P2), 3177 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, SVEver, SVE2p1, CAP_HWCAP, KERNEL_HWCAP_SVE2P1), 3178 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, SVEver, SVE2, CAP_HWCAP, KERNEL_HWCAP_SVE2), 3179 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, AES, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEAES), 3180 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, AES, PMULL128, CAP_HWCAP, KERNEL_HWCAP_SVEPMULL), 3181 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, AES, AES2, CAP_HWCAP, KERNEL_HWCAP_SVE_AES2), 3182 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, BitPerm, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEBITPERM), 3183 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, B16B16, IMP, CAP_HWCAP, KERNEL_HWCAP_SVE_B16B16), 3184 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, B16B16, BFSCALE, CAP_HWCAP, KERNEL_HWCAP_SVE_BFSCALE), 3185 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, BF16, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEBF16), 3186 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, BF16, EBF16, CAP_HWCAP, KERNEL_HWCAP_SVE_EBF16), 3187 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, SHA3, IMP, CAP_HWCAP, KERNEL_HWCAP_SVESHA3), 3188 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, SM4, IMP, CAP_HWCAP, KERNEL_HWCAP_SVESM4), 3189 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, I8MM, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEI8MM), 3190 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, F32MM, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEF32MM), 3191 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, F64MM, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEF64MM), 3192 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, F16MM, IMP, CAP_HWCAP, KERNEL_HWCAP_SVE_F16MM), 3193 HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, EltPerm, IMP, CAP_HWCAP, KERNEL_HWCAP_SVE_ELTPERM), 3194 #endif 3195 #ifdef CONFIG_ARM64_GCS 3196 HWCAP_CAP(ID_AA64PFR1_EL1, GCS, IMP, CAP_HWCAP, KERNEL_HWCAP_GCS), 3197 #endif 3198 HWCAP_CAP(ID_AA64PFR1_EL1, SSBS, SSBS2, CAP_HWCAP, KERNEL_HWCAP_SSBS), 3199 #ifdef CONFIG_ARM64_BTI 3200 HWCAP_CAP(ID_AA64PFR1_EL1, BT, IMP, CAP_HWCAP, KERNEL_HWCAP_BTI), 3201 #endif 3202 #ifdef CONFIG_ARM64_PTR_AUTH 3203 HWCAP_MULTI_CAP(ptr_auth_hwcap_addr_matches, CAP_HWCAP, KERNEL_HWCAP_PACA), 3204 HWCAP_MULTI_CAP(ptr_auth_hwcap_gen_matches, CAP_HWCAP, KERNEL_HWCAP_PACG), 3205 #endif 3206 #ifdef CONFIG_ARM64_MTE 3207 HWCAP_CAP(ID_AA64PFR1_EL1, MTE, MTE2, CAP_HWCAP, KERNEL_HWCAP_MTE), 3208 HWCAP_CAP(ID_AA64PFR1_EL1, MTE, MTE3, CAP_HWCAP, KERNEL_HWCAP_MTE3), 3209 #endif /* CONFIG_ARM64_MTE */ 3210 HWCAP_CAP(ID_AA64MMFR0_EL1, ECV, IMP, CAP_HWCAP, KERNEL_HWCAP_ECV), 3211 HWCAP_CAP(ID_AA64MMFR1_EL1, AFP, IMP, CAP_HWCAP, KERNEL_HWCAP_AFP), 3212 HWCAP_CAP(ID_AA64ISAR2_EL1, CSSC, IMP, CAP_HWCAP, KERNEL_HWCAP_CSSC), 3213 HWCAP_CAP(ID_AA64ISAR2_EL1, CSSC, CMPBR, CAP_HWCAP, KERNEL_HWCAP_CMPBR), 3214 HWCAP_CAP(ID_AA64ISAR2_EL1, RPRFM, IMP, CAP_HWCAP, KERNEL_HWCAP_RPRFM), 3215 HWCAP_CAP(ID_AA64ISAR2_EL1, RPRES, IMP, CAP_HWCAP, KERNEL_HWCAP_RPRES), 3216 HWCAP_CAP(ID_AA64ISAR2_EL1, WFxT, IMP, CAP_HWCAP, KERNEL_HWCAP_WFXT), 3217 HWCAP_CAP(ID_AA64ISAR2_EL1, MOPS, IMP, CAP_HWCAP, KERNEL_HWCAP_MOPS), 3218 HWCAP_CAP(ID_AA64ISAR2_EL1, BC, IMP, CAP_HWCAP, KERNEL_HWCAP_HBC), 3219 #ifdef CONFIG_ARM64_SME 3220 HWCAP_CAP(ID_AA64PFR1_EL1, SME, IMP, CAP_HWCAP, KERNEL_HWCAP_SME), 3221 HWCAP_CAP(ID_AA64SMFR0_EL1, FA64, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_FA64), 3222 HWCAP_CAP(ID_AA64SMFR0_EL1, LUTv2, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_LUTV2), 3223 HWCAP_CAP(ID_AA64SMFR0_EL1, SMEver, SME2p2, CAP_HWCAP, KERNEL_HWCAP_SME2P2), 3224 HWCAP_CAP(ID_AA64SMFR0_EL1, SMEver, SME2p1, CAP_HWCAP, KERNEL_HWCAP_SME2P1), 3225 HWCAP_CAP(ID_AA64SMFR0_EL1, SMEver, SME2, CAP_HWCAP, KERNEL_HWCAP_SME2), 3226 HWCAP_CAP(ID_AA64SMFR0_EL1, I16I64, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_I16I64), 3227 HWCAP_CAP(ID_AA64SMFR0_EL1, F64F64, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_F64F64), 3228 HWCAP_CAP(ID_AA64SMFR0_EL1, I16I32, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_I16I32), 3229 HWCAP_CAP(ID_AA64SMFR0_EL1, B16B16, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_B16B16), 3230 HWCAP_CAP(ID_AA64SMFR0_EL1, F16F16, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_F16F16), 3231 HWCAP_CAP(ID_AA64SMFR0_EL1, F8F16, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_F8F16), 3232 HWCAP_CAP(ID_AA64SMFR0_EL1, F8F32, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_F8F32), 3233 HWCAP_CAP(ID_AA64SMFR0_EL1, I8I32, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_I8I32), 3234 HWCAP_CAP(ID_AA64SMFR0_EL1, F16F32, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_F16F32), 3235 HWCAP_CAP(ID_AA64SMFR0_EL1, B16F32, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_B16F32), 3236 HWCAP_CAP(ID_AA64SMFR0_EL1, BI32I32, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_BI32I32), 3237 HWCAP_CAP(ID_AA64SMFR0_EL1, F32F32, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_F32F32), 3238 HWCAP_CAP(ID_AA64SMFR0_EL1, SF8FMA, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_SF8FMA), 3239 HWCAP_CAP(ID_AA64SMFR0_EL1, SF8DP4, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_SF8DP4), 3240 HWCAP_CAP(ID_AA64SMFR0_EL1, SF8DP2, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_SF8DP2), 3241 HWCAP_CAP(ID_AA64SMFR0_EL1, SBitPerm, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_SBITPERM), 3242 HWCAP_CAP(ID_AA64SMFR0_EL1, AES, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_AES), 3243 HWCAP_CAP(ID_AA64SMFR0_EL1, SFEXPA, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_SFEXPA), 3244 HWCAP_CAP(ID_AA64SMFR0_EL1, STMOP, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_STMOP), 3245 HWCAP_CAP(ID_AA64SMFR0_EL1, SMOP4, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_SMOP4), 3246 #endif /* CONFIG_ARM64_SME */ 3247 HWCAP_CAP(ID_AA64FPFR0_EL1, F8CVT, IMP, CAP_HWCAP, KERNEL_HWCAP_F8CVT), 3248 HWCAP_CAP(ID_AA64FPFR0_EL1, F8FMA, IMP, CAP_HWCAP, KERNEL_HWCAP_F8FMA), 3249 HWCAP_CAP(ID_AA64FPFR0_EL1, F8DP4, IMP, CAP_HWCAP, KERNEL_HWCAP_F8DP4), 3250 HWCAP_CAP(ID_AA64FPFR0_EL1, F8DP2, IMP, CAP_HWCAP, KERNEL_HWCAP_F8DP2), 3251 HWCAP_CAP(ID_AA64FPFR0_EL1, F8MM8, IMP, CAP_HWCAP, KERNEL_HWCAP_F8MM8), 3252 HWCAP_CAP(ID_AA64FPFR0_EL1, F8MM4, IMP, CAP_HWCAP, KERNEL_HWCAP_F8MM4), 3253 HWCAP_CAP(ID_AA64FPFR0_EL1, F8E4M3, IMP, CAP_HWCAP, KERNEL_HWCAP_F8E4M3), 3254 HWCAP_CAP(ID_AA64FPFR0_EL1, F8E5M2, IMP, CAP_HWCAP, KERNEL_HWCAP_F8E5M2), 3255 #ifdef CONFIG_ARM64_POE 3256 HWCAP_CAP(ID_AA64MMFR3_EL1, S1POE, IMP, CAP_HWCAP, KERNEL_HWCAP_POE), 3257 #endif 3258 {}, 3259 }; 3260 3261 #ifdef CONFIG_COMPAT 3262 static bool compat_has_neon(const struct arm64_cpu_capabilities *cap, int scope) 3263 { 3264 /* 3265 * Check that all of MVFR1_EL1.{SIMDSP, SIMDInt, SIMDLS} are available, 3266 * in line with that of arm32 as in vfp_init(). We make sure that the 3267 * check is future proof, by making sure value is non-zero. 3268 */ 3269 u32 mvfr1; 3270 3271 WARN_ON(scope == SCOPE_LOCAL_CPU && preemptible()); 3272 if (scope == SCOPE_SYSTEM) 3273 mvfr1 = read_sanitised_ftr_reg(SYS_MVFR1_EL1); 3274 else 3275 mvfr1 = read_sysreg_s(SYS_MVFR1_EL1); 3276 3277 return cpuid_feature_extract_unsigned_field(mvfr1, MVFR1_EL1_SIMDSP_SHIFT) && 3278 cpuid_feature_extract_unsigned_field(mvfr1, MVFR1_EL1_SIMDInt_SHIFT) && 3279 cpuid_feature_extract_unsigned_field(mvfr1, MVFR1_EL1_SIMDLS_SHIFT); 3280 } 3281 #endif 3282 3283 static const struct arm64_cpu_capabilities compat_elf_hwcaps[] = { 3284 #ifdef CONFIG_COMPAT 3285 HWCAP_CAP_MATCH(compat_has_neon, CAP_COMPAT_HWCAP, COMPAT_HWCAP_NEON), 3286 HWCAP_CAP(MVFR1_EL1, SIMDFMAC, IMP, CAP_COMPAT_HWCAP, COMPAT_HWCAP_VFPv4), 3287 /* Arm v8 mandates MVFR0.FPDP == {0, 2}. So, piggy back on this for the presence of VFP support */ 3288 HWCAP_CAP(MVFR0_EL1, FPDP, VFPv3, CAP_COMPAT_HWCAP, COMPAT_HWCAP_VFP), 3289 HWCAP_CAP(MVFR0_EL1, FPDP, VFPv3, CAP_COMPAT_HWCAP, COMPAT_HWCAP_VFPv3), 3290 HWCAP_CAP(MVFR1_EL1, FPHP, FP16, CAP_COMPAT_HWCAP, COMPAT_HWCAP_FPHP), 3291 HWCAP_CAP(MVFR1_EL1, SIMDHP, SIMDHP_FLOAT, CAP_COMPAT_HWCAP, COMPAT_HWCAP_ASIMDHP), 3292 HWCAP_CAP(ID_ISAR5_EL1, AES, VMULL, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_PMULL), 3293 HWCAP_CAP(ID_ISAR5_EL1, AES, IMP, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_AES), 3294 HWCAP_CAP(ID_ISAR5_EL1, SHA1, IMP, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SHA1), 3295 HWCAP_CAP(ID_ISAR5_EL1, SHA2, IMP, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SHA2), 3296 HWCAP_CAP(ID_ISAR5_EL1, CRC32, IMP, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_CRC32), 3297 HWCAP_CAP(ID_ISAR6_EL1, DP, IMP, CAP_COMPAT_HWCAP, COMPAT_HWCAP_ASIMDDP), 3298 HWCAP_CAP(ID_ISAR6_EL1, FHM, IMP, CAP_COMPAT_HWCAP, COMPAT_HWCAP_ASIMDFHM), 3299 HWCAP_CAP(ID_ISAR6_EL1, SB, IMP, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SB), 3300 HWCAP_CAP(ID_ISAR6_EL1, BF16, IMP, CAP_COMPAT_HWCAP, COMPAT_HWCAP_ASIMDBF16), 3301 HWCAP_CAP(ID_ISAR6_EL1, I8MM, IMP, CAP_COMPAT_HWCAP, COMPAT_HWCAP_I8MM), 3302 HWCAP_CAP(ID_PFR2_EL1, SSBS, IMP, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SSBS), 3303 #endif 3304 {}, 3305 }; 3306 3307 static void cap_set_elf_hwcap(const struct arm64_cpu_capabilities *cap) 3308 { 3309 switch (cap->hwcap_type) { 3310 case CAP_HWCAP: 3311 cpu_set_feature(cap->hwcap); 3312 break; 3313 #ifdef CONFIG_COMPAT 3314 case CAP_COMPAT_HWCAP: 3315 compat_elf_hwcap |= (u32)cap->hwcap; 3316 break; 3317 case CAP_COMPAT_HWCAP2: 3318 compat_elf_hwcap2 |= (u32)cap->hwcap; 3319 break; 3320 #endif 3321 default: 3322 WARN_ON(1); 3323 break; 3324 } 3325 } 3326 3327 /* Check if we have a particular HWCAP enabled */ 3328 static bool cpus_have_elf_hwcap(const struct arm64_cpu_capabilities *cap) 3329 { 3330 bool rc; 3331 3332 switch (cap->hwcap_type) { 3333 case CAP_HWCAP: 3334 rc = cpu_have_feature(cap->hwcap); 3335 break; 3336 #ifdef CONFIG_COMPAT 3337 case CAP_COMPAT_HWCAP: 3338 rc = (compat_elf_hwcap & (u32)cap->hwcap) != 0; 3339 break; 3340 case CAP_COMPAT_HWCAP2: 3341 rc = (compat_elf_hwcap2 & (u32)cap->hwcap) != 0; 3342 break; 3343 #endif 3344 default: 3345 WARN_ON(1); 3346 rc = false; 3347 } 3348 3349 return rc; 3350 } 3351 3352 static void setup_elf_hwcaps(const struct arm64_cpu_capabilities *hwcaps) 3353 { 3354 /* We support emulation of accesses to CPU ID feature registers */ 3355 cpu_set_named_feature(CPUID); 3356 for (; hwcaps->matches; hwcaps++) 3357 if (hwcaps->matches(hwcaps, cpucap_default_scope(hwcaps))) 3358 cap_set_elf_hwcap(hwcaps); 3359 } 3360 3361 static void update_cpu_capabilities(u16 scope_mask) 3362 { 3363 int i; 3364 const struct arm64_cpu_capabilities *caps; 3365 3366 scope_mask &= ARM64_CPUCAP_SCOPE_MASK; 3367 for (i = 0; i < ARM64_NCAPS; i++) { 3368 caps = cpucap_ptrs[i]; 3369 if (!caps || !(caps->type & scope_mask) || 3370 cpus_have_cap(caps->capability) || 3371 !caps->matches(caps, cpucap_default_scope(caps))) 3372 continue; 3373 3374 if (caps->desc && !caps->cpus) 3375 pr_info("detected: %s\n", caps->desc); 3376 3377 __set_bit(caps->capability, system_cpucaps); 3378 3379 if ((scope_mask & SCOPE_BOOT_CPU) && (caps->type & SCOPE_BOOT_CPU)) 3380 set_bit(caps->capability, boot_cpucaps); 3381 } 3382 } 3383 3384 /* 3385 * Enable all the available capabilities on this CPU. The capabilities 3386 * with BOOT_CPU scope are handled separately and hence skipped here. 3387 */ 3388 static int cpu_enable_non_boot_scope_capabilities(void *__unused) 3389 { 3390 int i; 3391 u16 non_boot_scope = SCOPE_ALL & ~SCOPE_BOOT_CPU; 3392 3393 for_each_available_cap(i) { 3394 const struct arm64_cpu_capabilities *cap = cpucap_ptrs[i]; 3395 3396 if (WARN_ON(!cap)) 3397 continue; 3398 3399 if (!(cap->type & non_boot_scope)) 3400 continue; 3401 3402 if (cap->cpu_enable) 3403 cap->cpu_enable(cap); 3404 } 3405 return 0; 3406 } 3407 3408 /* 3409 * Run through the enabled capabilities and enable() it on all active 3410 * CPUs 3411 */ 3412 static void __init enable_cpu_capabilities(u16 scope_mask) 3413 { 3414 int i; 3415 const struct arm64_cpu_capabilities *caps; 3416 bool boot_scope; 3417 3418 scope_mask &= ARM64_CPUCAP_SCOPE_MASK; 3419 boot_scope = !!(scope_mask & SCOPE_BOOT_CPU); 3420 3421 for (i = 0; i < ARM64_NCAPS; i++) { 3422 caps = cpucap_ptrs[i]; 3423 if (!caps || !(caps->type & scope_mask) || 3424 !cpus_have_cap(caps->capability)) 3425 continue; 3426 3427 if (boot_scope && caps->cpu_enable) 3428 /* 3429 * Capabilities with SCOPE_BOOT_CPU scope are finalised 3430 * before any secondary CPU boots. Thus, each secondary 3431 * will enable the capability as appropriate via 3432 * check_local_cpu_capabilities(). The only exception is 3433 * the boot CPU, for which the capability must be 3434 * enabled here. This approach avoids costly 3435 * stop_machine() calls for this case. 3436 */ 3437 caps->cpu_enable(caps); 3438 } 3439 3440 /* 3441 * For all non-boot scope capabilities, use stop_machine() 3442 * as it schedules the work allowing us to modify PSTATE, 3443 * instead of on_each_cpu() which uses an IPI, giving us a 3444 * PSTATE that disappears when we return. 3445 */ 3446 if (!boot_scope) 3447 stop_machine(cpu_enable_non_boot_scope_capabilities, 3448 NULL, cpu_online_mask); 3449 } 3450 3451 /* 3452 * Run through the list of capabilities to check for conflicts. 3453 * If the system has already detected a capability, take necessary 3454 * action on this CPU. 3455 */ 3456 static void verify_local_cpu_caps(u16 scope_mask) 3457 { 3458 int i; 3459 bool cpu_has_cap, system_has_cap; 3460 const struct arm64_cpu_capabilities *caps; 3461 3462 scope_mask &= ARM64_CPUCAP_SCOPE_MASK; 3463 3464 for (i = 0; i < ARM64_NCAPS; i++) { 3465 caps = cpucap_ptrs[i]; 3466 if (!caps || !(caps->type & scope_mask)) 3467 continue; 3468 3469 cpu_has_cap = caps->matches(caps, SCOPE_LOCAL_CPU); 3470 system_has_cap = cpus_have_cap(caps->capability); 3471 3472 if (system_has_cap) { 3473 /* 3474 * Check if the new CPU misses an advertised feature, 3475 * which is not safe to miss. 3476 */ 3477 if (!cpu_has_cap && !cpucap_late_cpu_optional(caps)) 3478 break; 3479 /* 3480 * We have to issue cpu_enable() irrespective of 3481 * whether the CPU has it or not, as it is enabeld 3482 * system wide. It is upto the call back to take 3483 * appropriate action on this CPU. 3484 */ 3485 if (caps->cpu_enable) 3486 caps->cpu_enable(caps); 3487 } else { 3488 /* 3489 * Check if the CPU has this capability if it isn't 3490 * safe to have when the system doesn't. 3491 */ 3492 if (cpu_has_cap && !cpucap_late_cpu_permitted(caps)) 3493 break; 3494 } 3495 } 3496 3497 if (i < ARM64_NCAPS) { 3498 pr_crit("CPU%d: Detected conflict for capability %d (%s), System: %d, CPU: %d\n", 3499 smp_processor_id(), caps->capability, 3500 caps->desc, system_has_cap, cpu_has_cap); 3501 3502 if (cpucap_panic_on_conflict(caps)) 3503 cpu_panic_kernel(); 3504 else 3505 cpu_die_early(); 3506 } 3507 } 3508 3509 /* 3510 * Check for CPU features that are used in early boot 3511 * based on the Boot CPU value. 3512 */ 3513 static void check_early_cpu_features(void) 3514 { 3515 verify_cpu_asid_bits(); 3516 3517 verify_local_cpu_caps(SCOPE_BOOT_CPU); 3518 } 3519 3520 static void 3521 __verify_local_elf_hwcaps(const struct arm64_cpu_capabilities *caps) 3522 { 3523 3524 for (; caps->matches; caps++) 3525 if (cpus_have_elf_hwcap(caps) && !caps->matches(caps, SCOPE_LOCAL_CPU)) { 3526 pr_crit("CPU%d: missing HWCAP: %s\n", 3527 smp_processor_id(), caps->desc); 3528 cpu_die_early(); 3529 } 3530 } 3531 3532 static void verify_local_elf_hwcaps(void) 3533 { 3534 __verify_local_elf_hwcaps(arm64_elf_hwcaps); 3535 3536 if (id_aa64pfr0_32bit_el0(read_cpuid(ID_AA64PFR0_EL1))) 3537 __verify_local_elf_hwcaps(compat_elf_hwcaps); 3538 } 3539 3540 static void verify_sve_features(void) 3541 { 3542 unsigned long cpacr = cpacr_save_enable_kernel_sve(); 3543 3544 if (vec_verify_vq_map(ARM64_VEC_SVE)) { 3545 pr_crit("CPU%d: SVE: vector length support mismatch\n", 3546 smp_processor_id()); 3547 cpu_die_early(); 3548 } 3549 3550 cpacr_restore(cpacr); 3551 } 3552 3553 static void verify_sme_features(void) 3554 { 3555 unsigned long cpacr = cpacr_save_enable_kernel_sme(); 3556 3557 if (vec_verify_vq_map(ARM64_VEC_SME)) { 3558 pr_crit("CPU%d: SME: vector length support mismatch\n", 3559 smp_processor_id()); 3560 cpu_die_early(); 3561 } 3562 3563 cpacr_restore(cpacr); 3564 } 3565 3566 static void verify_hyp_capabilities(void) 3567 { 3568 u64 safe_mmfr1, mmfr0, mmfr1; 3569 int parange, ipa_max; 3570 unsigned int safe_vmid_bits, vmid_bits; 3571 3572 if (!IS_ENABLED(CONFIG_KVM)) 3573 return; 3574 3575 safe_mmfr1 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1); 3576 mmfr0 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1); 3577 mmfr1 = read_cpuid(ID_AA64MMFR1_EL1); 3578 3579 /* Verify VMID bits */ 3580 safe_vmid_bits = get_vmid_bits(safe_mmfr1); 3581 vmid_bits = get_vmid_bits(mmfr1); 3582 if (vmid_bits < safe_vmid_bits) { 3583 pr_crit("CPU%d: VMID width mismatch\n", smp_processor_id()); 3584 cpu_die_early(); 3585 } 3586 3587 /* Verify IPA range */ 3588 parange = cpuid_feature_extract_unsigned_field(mmfr0, 3589 ID_AA64MMFR0_EL1_PARANGE_SHIFT); 3590 ipa_max = id_aa64mmfr0_parange_to_phys_shift(parange); 3591 if (ipa_max < get_kvm_ipa_limit()) { 3592 pr_crit("CPU%d: IPA range mismatch\n", smp_processor_id()); 3593 cpu_die_early(); 3594 } 3595 } 3596 3597 static void verify_mpam_capabilities(void) 3598 { 3599 u64 cpu_idr = read_cpuid(ID_AA64PFR0_EL1); 3600 u64 sys_idr = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1); 3601 u16 cpu_partid_max, cpu_pmg_max, sys_partid_max, sys_pmg_max; 3602 3603 if (FIELD_GET(ID_AA64PFR0_EL1_MPAM_MASK, cpu_idr) != 3604 FIELD_GET(ID_AA64PFR0_EL1_MPAM_MASK, sys_idr)) { 3605 pr_crit("CPU%d: MPAM version mismatch\n", smp_processor_id()); 3606 cpu_die_early(); 3607 } 3608 3609 cpu_idr = read_cpuid(MPAMIDR_EL1); 3610 sys_idr = read_sanitised_ftr_reg(SYS_MPAMIDR_EL1); 3611 if (FIELD_GET(MPAMIDR_EL1_HAS_HCR, cpu_idr) != 3612 FIELD_GET(MPAMIDR_EL1_HAS_HCR, sys_idr)) { 3613 pr_crit("CPU%d: Missing MPAM HCR\n", smp_processor_id()); 3614 cpu_die_early(); 3615 } 3616 3617 cpu_partid_max = FIELD_GET(MPAMIDR_EL1_PARTID_MAX, cpu_idr); 3618 cpu_pmg_max = FIELD_GET(MPAMIDR_EL1_PMG_MAX, cpu_idr); 3619 sys_partid_max = FIELD_GET(MPAMIDR_EL1_PARTID_MAX, sys_idr); 3620 sys_pmg_max = FIELD_GET(MPAMIDR_EL1_PMG_MAX, sys_idr); 3621 if (cpu_partid_max < sys_partid_max || cpu_pmg_max < sys_pmg_max) { 3622 pr_crit("CPU%d: MPAM PARTID/PMG max values are mismatched\n", smp_processor_id()); 3623 cpu_die_early(); 3624 } 3625 } 3626 3627 /* 3628 * Run through the enabled system capabilities and enable() it on this CPU. 3629 * The capabilities were decided based on the available CPUs at the boot time. 3630 * Any new CPU should match the system wide status of the capability. If the 3631 * new CPU doesn't have a capability which the system now has enabled, we 3632 * cannot do anything to fix it up and could cause unexpected failures. So 3633 * we park the CPU. 3634 */ 3635 static void verify_local_cpu_capabilities(void) 3636 { 3637 /* 3638 * The capabilities with SCOPE_BOOT_CPU are checked from 3639 * check_early_cpu_features(), as they need to be verified 3640 * on all secondary CPUs. 3641 */ 3642 verify_local_cpu_caps(SCOPE_ALL & ~SCOPE_BOOT_CPU); 3643 verify_local_elf_hwcaps(); 3644 3645 if (system_supports_sve()) 3646 verify_sve_features(); 3647 3648 if (system_supports_sme()) 3649 verify_sme_features(); 3650 3651 if (is_hyp_mode_available()) 3652 verify_hyp_capabilities(); 3653 3654 if (system_supports_mpam()) 3655 verify_mpam_capabilities(); 3656 } 3657 3658 void check_local_cpu_capabilities(void) 3659 { 3660 /* 3661 * All secondary CPUs should conform to the early CPU features 3662 * in use by the kernel based on boot CPU. 3663 */ 3664 check_early_cpu_features(); 3665 3666 /* 3667 * If we haven't finalised the system capabilities, this CPU gets 3668 * a chance to update the errata work arounds and local features. 3669 * Otherwise, this CPU should verify that it has all the system 3670 * advertised capabilities. 3671 */ 3672 if (!system_capabilities_finalized()) 3673 update_cpu_capabilities(SCOPE_LOCAL_CPU); 3674 else 3675 verify_local_cpu_capabilities(); 3676 } 3677 3678 bool this_cpu_has_cap(unsigned int n) 3679 { 3680 if (!WARN_ON(preemptible()) && n < ARM64_NCAPS) { 3681 const struct arm64_cpu_capabilities *cap = cpucap_ptrs[n]; 3682 3683 if (cap) 3684 return cap->matches(cap, SCOPE_LOCAL_CPU); 3685 } 3686 3687 return false; 3688 } 3689 EXPORT_SYMBOL_GPL(this_cpu_has_cap); 3690 3691 /* 3692 * This helper function is used in a narrow window when, 3693 * - The system wide safe registers are set with all the SMP CPUs and, 3694 * - The SYSTEM_FEATURE system_cpucaps may not have been set. 3695 */ 3696 static bool __maybe_unused __system_matches_cap(unsigned int n) 3697 { 3698 if (n < ARM64_NCAPS) { 3699 const struct arm64_cpu_capabilities *cap = cpucap_ptrs[n]; 3700 3701 if (cap) 3702 return cap->matches(cap, SCOPE_SYSTEM); 3703 } 3704 return false; 3705 } 3706 3707 void cpu_set_feature(unsigned int num) 3708 { 3709 set_bit(num, elf_hwcap); 3710 } 3711 3712 bool cpu_have_feature(unsigned int num) 3713 { 3714 return test_bit(num, elf_hwcap); 3715 } 3716 EXPORT_SYMBOL_GPL(cpu_have_feature); 3717 3718 unsigned long cpu_get_elf_hwcap(void) 3719 { 3720 /* 3721 * We currently only populate the first 32 bits of AT_HWCAP. Please 3722 * note that for userspace compatibility we guarantee that bits 62 3723 * and 63 will always be returned as 0. 3724 */ 3725 return elf_hwcap[0]; 3726 } 3727 3728 unsigned long cpu_get_elf_hwcap2(void) 3729 { 3730 return elf_hwcap[1]; 3731 } 3732 3733 unsigned long cpu_get_elf_hwcap3(void) 3734 { 3735 return elf_hwcap[2]; 3736 } 3737 3738 static void __init setup_boot_cpu_capabilities(void) 3739 { 3740 kvm_arm_target_impl_cpu_init(); 3741 /* 3742 * The boot CPU's feature register values have been recorded. Detect 3743 * boot cpucaps and local cpucaps for the boot CPU, then enable and 3744 * patch alternatives for the available boot cpucaps. 3745 */ 3746 update_cpu_capabilities(SCOPE_BOOT_CPU | SCOPE_LOCAL_CPU); 3747 enable_cpu_capabilities(SCOPE_BOOT_CPU); 3748 apply_boot_alternatives(); 3749 } 3750 3751 void __init setup_boot_cpu_features(void) 3752 { 3753 /* 3754 * Initialize the indirect array of CPU capabilities pointers before we 3755 * handle the boot CPU. 3756 */ 3757 init_cpucap_indirect_list(); 3758 3759 /* 3760 * Detect broken pseudo-NMI. Must be called _before_ the call to 3761 * setup_boot_cpu_capabilities() since it interacts with 3762 * can_use_gic_priorities(). 3763 */ 3764 detect_system_supports_pseudo_nmi(); 3765 3766 setup_boot_cpu_capabilities(); 3767 } 3768 3769 static void __init setup_system_capabilities(void) 3770 { 3771 /* 3772 * The system-wide safe feature register values have been finalized. 3773 * Detect, enable, and patch alternatives for the available system 3774 * cpucaps. 3775 */ 3776 update_cpu_capabilities(SCOPE_SYSTEM); 3777 enable_cpu_capabilities(SCOPE_ALL & ~SCOPE_BOOT_CPU); 3778 apply_alternatives_all(); 3779 3780 /* 3781 * Log any cpucaps with a cpumask as these aren't logged by 3782 * update_cpu_capabilities(). 3783 */ 3784 for (int i = 0; i < ARM64_NCAPS; i++) { 3785 const struct arm64_cpu_capabilities *caps = cpucap_ptrs[i]; 3786 3787 if (caps && caps->cpus && caps->desc && 3788 cpumask_any(caps->cpus) < nr_cpu_ids) 3789 pr_info("detected: %s on CPU%*pbl\n", 3790 caps->desc, cpumask_pr_args(caps->cpus)); 3791 } 3792 3793 /* 3794 * TTBR0 PAN doesn't have its own cpucap, so log it manually. 3795 */ 3796 if (system_uses_ttbr0_pan()) 3797 pr_info("emulated: Privileged Access Never (PAN) using TTBR0_EL1 switching\n"); 3798 } 3799 3800 void __init setup_system_features(void) 3801 { 3802 setup_system_capabilities(); 3803 3804 kpti_install_ng_mappings(); 3805 3806 sve_setup(); 3807 sme_setup(); 3808 3809 /* 3810 * Check for sane CTR_EL0.CWG value. 3811 */ 3812 if (!cache_type_cwg()) 3813 pr_warn("No Cache Writeback Granule information, assuming %d\n", 3814 ARCH_DMA_MINALIGN); 3815 } 3816 3817 void __init setup_user_features(void) 3818 { 3819 user_feature_fixup(); 3820 3821 setup_elf_hwcaps(arm64_elf_hwcaps); 3822 3823 if (system_supports_32bit_el0()) { 3824 setup_elf_hwcaps(compat_elf_hwcaps); 3825 elf_hwcap_fixup(); 3826 } 3827 3828 minsigstksz_setup(); 3829 } 3830 3831 static int enable_mismatched_32bit_el0(unsigned int cpu) 3832 { 3833 /* 3834 * The first 32-bit-capable CPU we detected and so can no longer 3835 * be offlined by userspace. -1 indicates we haven't yet onlined 3836 * a 32-bit-capable CPU. 3837 */ 3838 static int lucky_winner = -1; 3839 3840 struct cpuinfo_arm64 *info = &per_cpu(cpu_data, cpu); 3841 bool cpu_32bit = false; 3842 3843 if (id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0)) { 3844 if (!housekeeping_cpu(cpu, HK_TYPE_TICK)) 3845 pr_info("Treating adaptive-ticks CPU %u as 64-bit only\n", cpu); 3846 else 3847 cpu_32bit = true; 3848 } 3849 3850 if (cpu_32bit) { 3851 cpumask_set_cpu(cpu, cpu_32bit_el0_mask); 3852 static_branch_enable_cpuslocked(&arm64_mismatched_32bit_el0); 3853 } 3854 3855 if (cpumask_test_cpu(0, cpu_32bit_el0_mask) == cpu_32bit) 3856 return 0; 3857 3858 if (lucky_winner >= 0) 3859 return 0; 3860 3861 /* 3862 * We've detected a mismatch. We need to keep one of our CPUs with 3863 * 32-bit EL0 online so that is_cpu_allowed() doesn't end up rejecting 3864 * every CPU in the system for a 32-bit task. 3865 */ 3866 lucky_winner = cpu_32bit ? cpu : cpumask_any_and(cpu_32bit_el0_mask, 3867 cpu_active_mask); 3868 get_cpu_device(lucky_winner)->offline_disabled = true; 3869 setup_elf_hwcaps(compat_elf_hwcaps); 3870 elf_hwcap_fixup(); 3871 pr_info("Asymmetric 32-bit EL0 support detected on CPU %u; CPU hot-unplug disabled on CPU %u\n", 3872 cpu, lucky_winner); 3873 return 0; 3874 } 3875 3876 static int __init init_32bit_el0_mask(void) 3877 { 3878 if (!allow_mismatched_32bit_el0) 3879 return 0; 3880 3881 if (!zalloc_cpumask_var(&cpu_32bit_el0_mask, GFP_KERNEL)) 3882 return -ENOMEM; 3883 3884 return cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, 3885 "arm64/mismatched_32bit_el0:online", 3886 enable_mismatched_32bit_el0, NULL); 3887 } 3888 subsys_initcall_sync(init_32bit_el0_mask); 3889 3890 static void __maybe_unused cpu_enable_cnp(struct arm64_cpu_capabilities const *cap) 3891 { 3892 cpu_enable_swapper_cnp(); 3893 } 3894 3895 /* 3896 * We emulate only the following system register space. 3897 * Op0 = 0x3, CRn = 0x0, Op1 = 0x0, CRm = [0, 2 - 7] 3898 * See Table C5-6 System instruction encodings for System register accesses, 3899 * ARMv8 ARM(ARM DDI 0487A.f) for more details. 3900 */ 3901 static inline bool __attribute_const__ is_emulated(u32 id) 3902 { 3903 return (sys_reg_Op0(id) == 0x3 && 3904 sys_reg_CRn(id) == 0x0 && 3905 sys_reg_Op1(id) == 0x0 && 3906 (sys_reg_CRm(id) == 0 || 3907 ((sys_reg_CRm(id) >= 2) && (sys_reg_CRm(id) <= 7)))); 3908 } 3909 3910 /* 3911 * With CRm == 0, reg should be one of : 3912 * MIDR_EL1, MPIDR_EL1 or REVIDR_EL1. 3913 */ 3914 static inline int emulate_id_reg(u32 id, u64 *valp) 3915 { 3916 switch (id) { 3917 case SYS_MIDR_EL1: 3918 *valp = read_cpuid_id(); 3919 break; 3920 case SYS_MPIDR_EL1: 3921 *valp = SYS_MPIDR_SAFE_VAL; 3922 break; 3923 case SYS_REVIDR_EL1: 3924 /* IMPLEMENTATION DEFINED values are emulated with 0 */ 3925 *valp = 0; 3926 break; 3927 default: 3928 return -EINVAL; 3929 } 3930 3931 return 0; 3932 } 3933 3934 static int emulate_sys_reg(u32 id, u64 *valp) 3935 { 3936 struct arm64_ftr_reg *regp; 3937 3938 if (!is_emulated(id)) 3939 return -EINVAL; 3940 3941 if (sys_reg_CRm(id) == 0) 3942 return emulate_id_reg(id, valp); 3943 3944 regp = get_arm64_ftr_reg_nowarn(id); 3945 if (regp) 3946 *valp = arm64_ftr_reg_user_value(regp); 3947 else 3948 /* 3949 * The untracked registers are either IMPLEMENTATION DEFINED 3950 * (e.g, ID_AFR0_EL1) or reserved RAZ. 3951 */ 3952 *valp = 0; 3953 return 0; 3954 } 3955 3956 int do_emulate_mrs(struct pt_regs *regs, u32 sys_reg, u32 rt) 3957 { 3958 int rc; 3959 u64 val; 3960 3961 rc = emulate_sys_reg(sys_reg, &val); 3962 if (!rc) { 3963 pt_regs_write_reg(regs, rt, val); 3964 arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE); 3965 } 3966 return rc; 3967 } 3968 3969 bool try_emulate_mrs(struct pt_regs *regs, u32 insn) 3970 { 3971 u32 sys_reg, rt; 3972 3973 if (compat_user_mode(regs) || !aarch64_insn_is_mrs(insn)) 3974 return false; 3975 3976 /* 3977 * sys_reg values are defined as used in mrs/msr instruction. 3978 * shift the imm value to get the encoding. 3979 */ 3980 sys_reg = (u32)aarch64_insn_decode_immediate(AARCH64_INSN_IMM_16, insn) << 5; 3981 rt = aarch64_insn_decode_register(AARCH64_INSN_REGTYPE_RT, insn); 3982 return do_emulate_mrs(regs, sys_reg, rt) == 0; 3983 } 3984 3985 enum mitigation_state arm64_get_meltdown_state(void) 3986 { 3987 if (__meltdown_safe) 3988 return SPECTRE_UNAFFECTED; 3989 3990 if (arm64_kernel_unmapped_at_el0()) 3991 return SPECTRE_MITIGATED; 3992 3993 return SPECTRE_VULNERABLE; 3994 } 3995 3996 ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, 3997 char *buf) 3998 { 3999 switch (arm64_get_meltdown_state()) { 4000 case SPECTRE_UNAFFECTED: 4001 return sprintf(buf, "Not affected\n"); 4002 4003 case SPECTRE_MITIGATED: 4004 return sprintf(buf, "Mitigation: PTI\n"); 4005 4006 default: 4007 return sprintf(buf, "Vulnerable\n"); 4008 } 4009 } 4010