1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2021 Google LLC 4 * Author: Fuad Tabba <tabba@google.com> 5 */ 6 7 #include <linux/irqchip/arm-gic-v3.h> 8 9 #include <asm/kvm_asm.h> 10 #include <asm/kvm_mmu.h> 11 12 #include <hyp/adjust_pc.h> 13 14 #include <nvhe/pkvm.h> 15 16 #include "../../sys_regs.h" 17 18 /* 19 * Copies of the host's CPU features registers holding sanitized values at hyp. 20 */ 21 u64 id_aa64pfr0_el1_sys_val; 22 u64 id_aa64pfr1_el1_sys_val; 23 u64 id_aa64isar0_el1_sys_val; 24 u64 id_aa64isar1_el1_sys_val; 25 u64 id_aa64isar2_el1_sys_val; 26 u64 id_aa64mmfr0_el1_sys_val; 27 u64 id_aa64mmfr1_el1_sys_val; 28 u64 id_aa64mmfr2_el1_sys_val; 29 u64 id_aa64smfr0_el1_sys_val; 30 31 struct pvm_ftr_bits { 32 bool sign; 33 u8 shift; 34 u8 width; 35 u8 max_val; 36 bool (*vm_supported)(const struct kvm *kvm); 37 }; 38 39 #define __MAX_FEAT_FUNC(id, fld, max, func, sgn) \ 40 { \ 41 .sign = sgn, \ 42 .shift = id##_##fld##_SHIFT, \ 43 .width = id##_##fld##_WIDTH, \ 44 .max_val = id##_##fld##_##max, \ 45 .vm_supported = func, \ 46 } 47 48 #define MAX_FEAT_FUNC(id, fld, max, func) \ 49 __MAX_FEAT_FUNC(id, fld, max, func, id##_##fld##_SIGNED) 50 51 #define MAX_FEAT(id, fld, max) \ 52 MAX_FEAT_FUNC(id, fld, max, NULL) 53 54 #define MAX_FEAT_ENUM(id, fld, max) \ 55 __MAX_FEAT_FUNC(id, fld, max, NULL, false) 56 57 #define FEAT_END { .width = 0, } 58 59 static bool vm_has_ptrauth(const struct kvm *kvm) 60 { 61 if (!IS_ENABLED(CONFIG_ARM64_PTR_AUTH)) 62 return false; 63 64 return (cpus_have_final_cap(ARM64_HAS_ADDRESS_AUTH) || 65 cpus_have_final_cap(ARM64_HAS_GENERIC_AUTH)) && 66 kvm_vcpu_has_feature(kvm, KVM_ARM_VCPU_PTRAUTH_GENERIC); 67 } 68 69 static bool vm_has_sve(const struct kvm *kvm) 70 { 71 return system_supports_sve() && kvm_vcpu_has_feature(kvm, KVM_ARM_VCPU_SVE); 72 } 73 74 /* 75 * Definitions for features to be allowed or restricted for protected guests. 76 * 77 * Each field in the masks represents the highest supported value for the 78 * feature. If a feature field is not present, it is not supported. Moreover, 79 * these are used to generate the guest's view of the feature registers. 80 * 81 * The approach for protected VMs is to at least support features that are: 82 * - Needed by common Linux distributions (e.g., floating point) 83 * - Trivial to support, e.g., supporting the feature does not introduce or 84 * require tracking of additional state in KVM 85 * - Cannot be trapped or prevent the guest from using anyway 86 */ 87 88 static const struct pvm_ftr_bits pvmid_aa64pfr0[] = { 89 MAX_FEAT(ID_AA64PFR0_EL1, EL0, IMP), 90 MAX_FEAT(ID_AA64PFR0_EL1, EL1, IMP), 91 MAX_FEAT(ID_AA64PFR0_EL1, EL2, IMP), 92 MAX_FEAT(ID_AA64PFR0_EL1, EL3, IMP), 93 MAX_FEAT(ID_AA64PFR0_EL1, FP, FP16), 94 MAX_FEAT(ID_AA64PFR0_EL1, AdvSIMD, FP16), 95 MAX_FEAT(ID_AA64PFR0_EL1, GIC, IMP), 96 MAX_FEAT_FUNC(ID_AA64PFR0_EL1, SVE, IMP, vm_has_sve), 97 MAX_FEAT(ID_AA64PFR0_EL1, RAS, IMP), 98 MAX_FEAT(ID_AA64PFR0_EL1, DIT, IMP), 99 MAX_FEAT(ID_AA64PFR0_EL1, CSV2, IMP), 100 MAX_FEAT(ID_AA64PFR0_EL1, CSV3, IMP), 101 FEAT_END 102 }; 103 104 static const struct pvm_ftr_bits pvmid_aa64pfr1[] = { 105 MAX_FEAT(ID_AA64PFR1_EL1, BT, IMP), 106 MAX_FEAT(ID_AA64PFR1_EL1, SSBS, SSBS2), 107 MAX_FEAT_ENUM(ID_AA64PFR1_EL1, MTE_frac, NI), 108 FEAT_END 109 }; 110 111 static const struct pvm_ftr_bits pvmid_aa64mmfr0[] = { 112 MAX_FEAT_ENUM(ID_AA64MMFR0_EL1, PARANGE, 40), 113 MAX_FEAT_ENUM(ID_AA64MMFR0_EL1, ASIDBITS, 16), 114 MAX_FEAT(ID_AA64MMFR0_EL1, BIGEND, IMP), 115 MAX_FEAT(ID_AA64MMFR0_EL1, SNSMEM, IMP), 116 MAX_FEAT(ID_AA64MMFR0_EL1, BIGENDEL0, IMP), 117 MAX_FEAT(ID_AA64MMFR0_EL1, EXS, IMP), 118 FEAT_END 119 }; 120 121 static const struct pvm_ftr_bits pvmid_aa64mmfr1[] = { 122 MAX_FEAT(ID_AA64MMFR1_EL1, HAFDBS, DBM), 123 MAX_FEAT_ENUM(ID_AA64MMFR1_EL1, VMIDBits, 16), 124 MAX_FEAT(ID_AA64MMFR1_EL1, HPDS, HPDS2), 125 MAX_FEAT(ID_AA64MMFR1_EL1, PAN, PAN3), 126 MAX_FEAT(ID_AA64MMFR1_EL1, SpecSEI, IMP), 127 MAX_FEAT(ID_AA64MMFR1_EL1, ETS, IMP), 128 MAX_FEAT(ID_AA64MMFR1_EL1, CMOW, IMP), 129 FEAT_END 130 }; 131 132 static const struct pvm_ftr_bits pvmid_aa64mmfr2[] = { 133 MAX_FEAT(ID_AA64MMFR2_EL1, CnP, IMP), 134 MAX_FEAT(ID_AA64MMFR2_EL1, UAO, IMP), 135 MAX_FEAT(ID_AA64MMFR2_EL1, IESB, IMP), 136 MAX_FEAT(ID_AA64MMFR2_EL1, AT, IMP), 137 MAX_FEAT_ENUM(ID_AA64MMFR2_EL1, IDS, 0x18), 138 MAX_FEAT(ID_AA64MMFR2_EL1, TTL, IMP), 139 MAX_FEAT(ID_AA64MMFR2_EL1, BBM, 2), 140 MAX_FEAT(ID_AA64MMFR2_EL1, E0PD, IMP), 141 FEAT_END 142 }; 143 144 static const struct pvm_ftr_bits pvmid_aa64isar1[] = { 145 MAX_FEAT(ID_AA64ISAR1_EL1, DPB, DPB2), 146 MAX_FEAT_FUNC(ID_AA64ISAR1_EL1, APA, PAuth, vm_has_ptrauth), 147 MAX_FEAT_FUNC(ID_AA64ISAR1_EL1, API, PAuth, vm_has_ptrauth), 148 MAX_FEAT(ID_AA64ISAR1_EL1, JSCVT, IMP), 149 MAX_FEAT(ID_AA64ISAR1_EL1, FCMA, IMP), 150 MAX_FEAT(ID_AA64ISAR1_EL1, LRCPC, LRCPC3), 151 MAX_FEAT(ID_AA64ISAR1_EL1, GPA, IMP), 152 MAX_FEAT(ID_AA64ISAR1_EL1, GPI, IMP), 153 MAX_FEAT(ID_AA64ISAR1_EL1, FRINTTS, IMP), 154 MAX_FEAT(ID_AA64ISAR1_EL1, SB, IMP), 155 MAX_FEAT(ID_AA64ISAR1_EL1, SPECRES, COSP_RCTX), 156 MAX_FEAT(ID_AA64ISAR1_EL1, BF16, EBF16), 157 MAX_FEAT(ID_AA64ISAR1_EL1, DGH, IMP), 158 MAX_FEAT(ID_AA64ISAR1_EL1, I8MM, IMP), 159 FEAT_END 160 }; 161 162 static const struct pvm_ftr_bits pvmid_aa64isar2[] = { 163 MAX_FEAT_FUNC(ID_AA64ISAR2_EL1, GPA3, IMP, vm_has_ptrauth), 164 MAX_FEAT_FUNC(ID_AA64ISAR2_EL1, APA3, PAuth, vm_has_ptrauth), 165 MAX_FEAT(ID_AA64ISAR2_EL1, ATS1A, IMP), 166 FEAT_END 167 }; 168 169 /* 170 * None of the features in ID_AA64DFR0_EL1 nor ID_AA64MMFR4_EL1 are supported. 171 * However, both have Not-Implemented values that are non-zero. Define them 172 * so they can be used when getting the value of these registers. 173 */ 174 #define ID_AA64DFR0_EL1_NONZERO_NI \ 175 ( \ 176 SYS_FIELD_PREP_ENUM(ID_AA64DFR0_EL1, DoubleLock, NI) | \ 177 SYS_FIELD_PREP_ENUM(ID_AA64DFR0_EL1, MTPMU, NI) \ 178 ) 179 180 #define ID_AA64MMFR4_EL1_NONZERO_NI \ 181 SYS_FIELD_PREP_ENUM(ID_AA64MMFR4_EL1, E2H0, NI) 182 183 /* 184 * Returns the value of the feature registers based on the system register 185 * value, the vcpu support for the revelant features, and the additional 186 * restrictions for protected VMs. 187 */ 188 static u64 get_restricted_features(const struct kvm_vcpu *vcpu, 189 u64 sys_reg_val, 190 const struct pvm_ftr_bits restrictions[]) 191 { 192 u64 val = 0UL; 193 int i; 194 195 for (i = 0; restrictions[i].width != 0; i++) { 196 bool (*vm_supported)(const struct kvm *) = restrictions[i].vm_supported; 197 bool sign = restrictions[i].sign; 198 int shift = restrictions[i].shift; 199 int width = restrictions[i].width; 200 u64 min_signed = (1UL << width) - 1UL; 201 u64 sign_bit = 1UL << (width - 1); 202 u64 mask = GENMASK_ULL(width + shift - 1, shift); 203 u64 sys_val = (sys_reg_val & mask) >> shift; 204 u64 pvm_max = restrictions[i].max_val; 205 206 if (vm_supported && !vm_supported(vcpu->kvm)) 207 val |= (sign ? min_signed : 0) << shift; 208 else if (sign && (sys_val >= sign_bit || pvm_max >= sign_bit)) 209 val |= max(sys_val, pvm_max) << shift; 210 else 211 val |= min(sys_val, pvm_max) << shift; 212 } 213 214 return val; 215 } 216 217 static u64 pvm_calc_id_reg(const struct kvm_vcpu *vcpu, u32 id) 218 { 219 switch (id) { 220 case SYS_ID_AA64PFR0_EL1: 221 return get_restricted_features(vcpu, id_aa64pfr0_el1_sys_val, pvmid_aa64pfr0); 222 case SYS_ID_AA64PFR1_EL1: 223 return get_restricted_features(vcpu, id_aa64pfr1_el1_sys_val, pvmid_aa64pfr1); 224 case SYS_ID_AA64ISAR0_EL1: 225 return id_aa64isar0_el1_sys_val; 226 case SYS_ID_AA64ISAR1_EL1: 227 return get_restricted_features(vcpu, id_aa64isar1_el1_sys_val, pvmid_aa64isar1); 228 case SYS_ID_AA64ISAR2_EL1: 229 return get_restricted_features(vcpu, id_aa64isar2_el1_sys_val, pvmid_aa64isar2); 230 case SYS_ID_AA64MMFR0_EL1: 231 return get_restricted_features(vcpu, id_aa64mmfr0_el1_sys_val, pvmid_aa64mmfr0); 232 case SYS_ID_AA64MMFR1_EL1: 233 return get_restricted_features(vcpu, id_aa64mmfr1_el1_sys_val, pvmid_aa64mmfr1); 234 case SYS_ID_AA64MMFR2_EL1: 235 return get_restricted_features(vcpu, id_aa64mmfr2_el1_sys_val, pvmid_aa64mmfr2); 236 case SYS_ID_AA64DFR0_EL1: 237 return ID_AA64DFR0_EL1_NONZERO_NI; 238 case SYS_ID_AA64MMFR4_EL1: 239 return ID_AA64MMFR4_EL1_NONZERO_NI; 240 default: 241 /* Unhandled ID register, RAZ */ 242 return 0; 243 } 244 } 245 246 /* 247 * Inject an unknown/undefined exception to an AArch64 guest while most of its 248 * sysregs are live. 249 */ 250 static void inject_undef64(struct kvm_vcpu *vcpu) 251 { 252 u64 esr = (ESR_ELx_EC_UNKNOWN << ESR_ELx_EC_SHIFT); 253 254 *vcpu_pc(vcpu) = read_sysreg_el2(SYS_ELR); 255 *vcpu_cpsr(vcpu) = read_sysreg_el2(SYS_SPSR); 256 __vcpu_assign_sys_reg(vcpu, VBAR_EL1, read_sysreg_el1(SYS_VBAR)); 257 258 kvm_pend_exception(vcpu, EXCEPT_AA64_EL1_SYNC); 259 260 __kvm_adjust_pc(vcpu); 261 262 write_sysreg_el1(esr, SYS_ESR); 263 write_sysreg_el1(read_sysreg_el2(SYS_ELR), SYS_ELR); 264 write_sysreg_el2(*vcpu_pc(vcpu), SYS_ELR); 265 write_sysreg_el2(*vcpu_cpsr(vcpu), SYS_SPSR); 266 } 267 268 static u64 read_id_reg(const struct kvm_vcpu *vcpu, 269 struct sys_reg_desc const *r) 270 { 271 struct kvm *kvm = vcpu->kvm; 272 u32 reg = reg_to_encoding(r); 273 274 if (WARN_ON_ONCE(!test_bit(KVM_ARCH_FLAG_ID_REGS_INITIALIZED, &kvm->arch.flags))) 275 return 0; 276 277 if (reg >= sys_reg(3, 0, 0, 1, 0) && reg <= sys_reg(3, 0, 0, 7, 7)) 278 return kvm->arch.id_regs[IDREG_IDX(reg)]; 279 280 return 0; 281 } 282 283 /* Handler to RAZ/WI sysregs */ 284 static bool pvm_access_raz_wi(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 285 const struct sys_reg_desc *r) 286 { 287 if (!p->is_write) 288 p->regval = 0; 289 290 return true; 291 } 292 293 /* 294 * Accessor for AArch32 feature id registers. 295 * 296 * The value of these registers is "unknown" according to the spec if AArch32 297 * isn't supported. 298 */ 299 static bool pvm_access_id_aarch32(struct kvm_vcpu *vcpu, 300 struct sys_reg_params *p, 301 const struct sys_reg_desc *r) 302 { 303 if (p->is_write) { 304 inject_undef64(vcpu); 305 return false; 306 } 307 308 return pvm_access_raz_wi(vcpu, p, r); 309 } 310 311 /* 312 * Accessor for AArch64 feature id registers. 313 * 314 * If access is allowed, set the regval to the protected VM's view of the 315 * register and return true. 316 * Otherwise, inject an undefined exception and return false. 317 */ 318 static bool pvm_access_id_aarch64(struct kvm_vcpu *vcpu, 319 struct sys_reg_params *p, 320 const struct sys_reg_desc *r) 321 { 322 if (p->is_write) { 323 inject_undef64(vcpu); 324 return false; 325 } 326 327 p->regval = read_id_reg(vcpu, r); 328 return true; 329 } 330 331 static bool pvm_gic_read_sre(struct kvm_vcpu *vcpu, 332 struct sys_reg_params *p, 333 const struct sys_reg_desc *r) 334 { 335 /* pVMs only support GICv3. 'nuf said. */ 336 if (!p->is_write) 337 p->regval = ICC_SRE_EL1_DIB | ICC_SRE_EL1_DFB | ICC_SRE_EL1_SRE; 338 339 return true; 340 } 341 342 /* Mark the specified system register as an AArch32 feature id register. */ 343 #define AARCH32(REG) { SYS_DESC(REG), .access = pvm_access_id_aarch32 } 344 345 /* Mark the specified system register as an AArch64 feature id register. */ 346 #define AARCH64(REG) { SYS_DESC(REG), .access = pvm_access_id_aarch64 } 347 348 /* 349 * sys_reg_desc initialiser for architecturally unallocated cpufeature ID 350 * register with encoding Op0=3, Op1=0, CRn=0, CRm=crm, Op2=op2 351 * (1 <= crm < 8, 0 <= Op2 < 8). 352 */ 353 #define ID_UNALLOCATED(crm, op2) { \ 354 Op0(3), Op1(0), CRn(0), CRm(crm), Op2(op2), \ 355 .access = pvm_access_id_aarch64, \ 356 } 357 358 /* Mark the specified system register as Read-As-Zero/Write-Ignored */ 359 #define RAZ_WI(REG) { SYS_DESC(REG), .access = pvm_access_raz_wi } 360 361 /* Mark the specified system register as not being handled in hyp. */ 362 #define HOST_HANDLED(REG) { SYS_DESC(REG), .access = NULL } 363 364 /* 365 * Architected system registers. 366 * Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2 367 * 368 * NOTE: Anything not explicitly listed here is *restricted by default*, i.e., 369 * it will lead to injecting an exception into the guest. 370 */ 371 static const struct sys_reg_desc pvm_sys_reg_descs[] = { 372 /* Cache maintenance by set/way operations are restricted. */ 373 374 /* Debug and Trace Registers are restricted. */ 375 376 /* Group 1 ID registers */ 377 HOST_HANDLED(SYS_REVIDR_EL1), 378 379 /* AArch64 mappings of the AArch32 ID registers */ 380 /* CRm=1 */ 381 AARCH32(SYS_ID_PFR0_EL1), 382 AARCH32(SYS_ID_PFR1_EL1), 383 AARCH32(SYS_ID_DFR0_EL1), 384 AARCH32(SYS_ID_AFR0_EL1), 385 AARCH32(SYS_ID_MMFR0_EL1), 386 AARCH32(SYS_ID_MMFR1_EL1), 387 AARCH32(SYS_ID_MMFR2_EL1), 388 AARCH32(SYS_ID_MMFR3_EL1), 389 390 /* CRm=2 */ 391 AARCH32(SYS_ID_ISAR0_EL1), 392 AARCH32(SYS_ID_ISAR1_EL1), 393 AARCH32(SYS_ID_ISAR2_EL1), 394 AARCH32(SYS_ID_ISAR3_EL1), 395 AARCH32(SYS_ID_ISAR4_EL1), 396 AARCH32(SYS_ID_ISAR5_EL1), 397 AARCH32(SYS_ID_MMFR4_EL1), 398 AARCH32(SYS_ID_ISAR6_EL1), 399 400 /* CRm=3 */ 401 AARCH32(SYS_MVFR0_EL1), 402 AARCH32(SYS_MVFR1_EL1), 403 AARCH32(SYS_MVFR2_EL1), 404 ID_UNALLOCATED(3,3), 405 AARCH32(SYS_ID_PFR2_EL1), 406 AARCH32(SYS_ID_DFR1_EL1), 407 AARCH32(SYS_ID_MMFR5_EL1), 408 ID_UNALLOCATED(3,7), 409 410 /* AArch64 ID registers */ 411 /* CRm=4 */ 412 AARCH64(SYS_ID_AA64PFR0_EL1), 413 AARCH64(SYS_ID_AA64PFR1_EL1), 414 ID_UNALLOCATED(4,2), 415 ID_UNALLOCATED(4,3), 416 AARCH64(SYS_ID_AA64ZFR0_EL1), 417 ID_UNALLOCATED(4,5), 418 ID_UNALLOCATED(4,6), 419 ID_UNALLOCATED(4,7), 420 AARCH64(SYS_ID_AA64DFR0_EL1), 421 AARCH64(SYS_ID_AA64DFR1_EL1), 422 ID_UNALLOCATED(5,2), 423 ID_UNALLOCATED(5,3), 424 AARCH64(SYS_ID_AA64AFR0_EL1), 425 AARCH64(SYS_ID_AA64AFR1_EL1), 426 ID_UNALLOCATED(5,6), 427 ID_UNALLOCATED(5,7), 428 AARCH64(SYS_ID_AA64ISAR0_EL1), 429 AARCH64(SYS_ID_AA64ISAR1_EL1), 430 AARCH64(SYS_ID_AA64ISAR2_EL1), 431 ID_UNALLOCATED(6,3), 432 ID_UNALLOCATED(6,4), 433 ID_UNALLOCATED(6,5), 434 ID_UNALLOCATED(6,6), 435 ID_UNALLOCATED(6,7), 436 AARCH64(SYS_ID_AA64MMFR0_EL1), 437 AARCH64(SYS_ID_AA64MMFR1_EL1), 438 AARCH64(SYS_ID_AA64MMFR2_EL1), 439 ID_UNALLOCATED(7,3), 440 ID_UNALLOCATED(7,4), 441 ID_UNALLOCATED(7,5), 442 ID_UNALLOCATED(7,6), 443 ID_UNALLOCATED(7,7), 444 445 /* Scalable Vector Registers are restricted. */ 446 447 RAZ_WI(SYS_ERRIDR_EL1), 448 RAZ_WI(SYS_ERRSELR_EL1), 449 RAZ_WI(SYS_ERXFR_EL1), 450 RAZ_WI(SYS_ERXCTLR_EL1), 451 RAZ_WI(SYS_ERXSTATUS_EL1), 452 RAZ_WI(SYS_ERXADDR_EL1), 453 RAZ_WI(SYS_ERXMISC0_EL1), 454 RAZ_WI(SYS_ERXMISC1_EL1), 455 456 /* Performance Monitoring Registers are restricted. */ 457 458 /* Limited Ordering Regions Registers are restricted. */ 459 460 HOST_HANDLED(SYS_ICC_SGI1R_EL1), 461 HOST_HANDLED(SYS_ICC_ASGI1R_EL1), 462 HOST_HANDLED(SYS_ICC_SGI0R_EL1), 463 { SYS_DESC(SYS_ICC_SRE_EL1), .access = pvm_gic_read_sre, }, 464 465 HOST_HANDLED(SYS_CCSIDR_EL1), 466 HOST_HANDLED(SYS_CLIDR_EL1), 467 HOST_HANDLED(SYS_AIDR_EL1), 468 HOST_HANDLED(SYS_CSSELR_EL1), 469 HOST_HANDLED(SYS_CTR_EL0), 470 471 /* Performance Monitoring Registers are restricted. */ 472 473 /* Activity Monitoring Registers are restricted. */ 474 475 HOST_HANDLED(SYS_CNTP_TVAL_EL0), 476 HOST_HANDLED(SYS_CNTP_CTL_EL0), 477 HOST_HANDLED(SYS_CNTP_CVAL_EL0), 478 479 /* Performance Monitoring Registers are restricted. */ 480 }; 481 482 /* 483 * Initializes feature registers for protected vms. 484 */ 485 void kvm_init_pvm_id_regs(struct kvm_vcpu *vcpu) 486 { 487 struct kvm *kvm = vcpu->kvm; 488 struct kvm_arch *ka = &kvm->arch; 489 u32 r; 490 491 hyp_assert_lock_held(&vm_table_lock); 492 493 if (test_bit(KVM_ARCH_FLAG_ID_REGS_INITIALIZED, &kvm->arch.flags)) 494 return; 495 496 /* 497 * Initialize only AArch64 id registers since AArch32 isn't supported 498 * for protected VMs. 499 */ 500 for (r = sys_reg(3, 0, 0, 4, 0); r <= sys_reg(3, 0, 0, 7, 7); r += sys_reg(0, 0, 0, 0, 1)) 501 ka->id_regs[IDREG_IDX(r)] = pvm_calc_id_reg(vcpu, r); 502 503 set_bit(KVM_ARCH_FLAG_ID_REGS_INITIALIZED, &kvm->arch.flags); 504 } 505 506 /* 507 * Checks that the sysreg table is unique and in-order. 508 * 509 * Returns 0 if the table is consistent, or 1 otherwise. 510 */ 511 int kvm_check_pvm_sysreg_table(void) 512 { 513 unsigned int i; 514 515 for (i = 1; i < ARRAY_SIZE(pvm_sys_reg_descs); i++) { 516 if (cmp_sys_reg(&pvm_sys_reg_descs[i-1], &pvm_sys_reg_descs[i]) >= 0) 517 return 1; 518 } 519 520 return 0; 521 } 522 523 /* 524 * Handler for protected VM MSR, MRS or System instruction execution. 525 * 526 * Returns true if the hypervisor has handled the exit, and control should go 527 * back to the guest, or false if it hasn't, to be handled by the host. 528 */ 529 bool kvm_handle_pvm_sysreg(struct kvm_vcpu *vcpu, u64 *exit_code) 530 { 531 const struct sys_reg_desc *r; 532 struct sys_reg_params params; 533 unsigned long esr = kvm_vcpu_get_esr(vcpu); 534 int Rt = kvm_vcpu_sys_get_rt(vcpu); 535 536 params = esr_sys64_to_params(esr); 537 params.regval = vcpu_get_reg(vcpu, Rt); 538 539 r = find_reg(¶ms, pvm_sys_reg_descs, ARRAY_SIZE(pvm_sys_reg_descs)); 540 541 /* Undefined (RESTRICTED). */ 542 if (r == NULL) { 543 inject_undef64(vcpu); 544 return true; 545 } 546 547 /* Handled by the host (HOST_HANDLED) */ 548 if (r->access == NULL) 549 return false; 550 551 /* Handled by hyp: skip instruction if instructed to do so. */ 552 if (r->access(vcpu, ¶ms, r)) 553 __kvm_skip_instr(vcpu); 554 555 if (!params.is_write) 556 vcpu_set_reg(vcpu, Rt, params.regval); 557 558 return true; 559 } 560 561 /* 562 * Handler for protected VM restricted exceptions. 563 * 564 * Inject an undefined exception into the guest and return true to indicate that 565 * the hypervisor has handled the exit, and control should go back to the guest. 566 */ 567 bool kvm_handle_pvm_restricted(struct kvm_vcpu *vcpu, u64 *exit_code) 568 { 569 inject_undef64(vcpu); 570 return true; 571 } 572