arch/arm64/include/asm/kvm_emulate.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2012,2013 - ARM Ltd
   4  * Author: Marc Zyngier <marc.zyngier@arm.com>
   5  *
   6  * Derived from arch/arm/include/kvm_emulate.h
   7  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   8  * Author: Christoffer Dall <c.dall@virtualopensystems.com>
   9  */
  10
  11 #ifndef __ARM64_KVM_EMULATE_H__
  12 #define __ARM64_KVM_EMULATE_H__
  13
  14 #include <linux/kvm_host.h>
  15
  16 #include <asm/debug-monitors.h>
  17 #include <asm/esr.h>
  18 #include <asm/kvm_arm.h>
  19 #include <asm/kvm_hyp.h>
  20 #include <asm/ptrace.h>
  21 #include <asm/cputype.h>
  22 #include <asm/virt.h>
  23
  24 #define CURRENT_EL_SP_EL0_VECTOR        0x0
  25 #define CURRENT_EL_SP_ELx_VECTOR        0x200
  26 #define LOWER_EL_AArch64_VECTOR         0x400
  27 #define LOWER_EL_AArch32_VECTOR         0x600
  28
  29 enum exception_type {
  30         except_type_sync        = 0,
  31         except_type_irq         = 0x80,
  32         except_type_fiq         = 0x100,
  33         except_type_serror      = 0x180,
  34 };
  35
  36 bool kvm_condition_valid32(const struct kvm_vcpu *vcpu);
  37 void kvm_skip_instr32(struct kvm_vcpu *vcpu);
  38
  39 void kvm_inject_undefined(struct kvm_vcpu *vcpu);
  40 void kvm_inject_vabt(struct kvm_vcpu *vcpu);
  41 void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr);
  42 void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
  43
  44 static __always_inline bool vcpu_el1_is_32bit(struct kvm_vcpu *vcpu)
  45 {
  46         return !(vcpu->arch.hcr_el2 & HCR_RW);
  47 }
  48
  49 static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu)
  50 {
  51         vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS;
  52         if (is_kernel_in_hyp_mode())
  53                 vcpu->arch.hcr_el2 |= HCR_E2H;
  54         if (cpus_have_const_cap(ARM64_HAS_RAS_EXTN)) {
  55                 /* route synchronous external abort exceptions to EL2 */
  56                 vcpu->arch.hcr_el2 |= HCR_TEA;
  57                 /* trap error record accesses */
  58                 vcpu->arch.hcr_el2 |= HCR_TERR;
  59         }
  60
  61         if (cpus_have_const_cap(ARM64_HAS_STAGE2_FWB)) {
  62                 vcpu->arch.hcr_el2 |= HCR_FWB;
  63         } else {
  64                 /*
  65                  * For non-FWB CPUs, we trap VM ops (HCR_EL2.TVM) until M+C
  66                  * get set in SCTLR_EL1 such that we can detect when the guest
  67                  * MMU gets turned on and do the necessary cache maintenance
  68                  * then.
  69                  */
  70                 vcpu->arch.hcr_el2 |= HCR_TVM;
  71         }
  72
  73         if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features))
  74                 vcpu->arch.hcr_el2 &= ~HCR_RW;
  75
  76         /*
  77          * TID3: trap feature register accesses that we virtualise.
  78          * For now this is conditional, since no AArch32 feature regs
  79          * are currently virtualised.
  80          */
  81         if (!vcpu_el1_is_32bit(vcpu))
  82                 vcpu->arch.hcr_el2 |= HCR_TID3;
  83
  84         if (cpus_have_const_cap(ARM64_MISMATCHED_CACHE_TYPE) ||
  85             vcpu_el1_is_32bit(vcpu))
  86                 vcpu->arch.hcr_el2 |= HCR_TID2;
  87 }
  88
  89 static inline unsigned long *vcpu_hcr(struct kvm_vcpu *vcpu)
  90 {
  91         return (unsigned long *)&vcpu->arch.hcr_el2;
  92 }
  93
  94 static inline void vcpu_clear_wfx_traps(struct kvm_vcpu *vcpu)
  95 {
  96         vcpu->arch.hcr_el2 &= ~HCR_TWE;
  97         if (atomic_read(&vcpu->arch.vgic_cpu.vgic_v3.its_vpe.vlpi_count) ||
  98             vcpu->kvm->arch.vgic.nassgireq)
  99                 vcpu->arch.hcr_el2 &= ~HCR_TWI;
 100         else
 101                 vcpu->arch.hcr_el2 |= HCR_TWI;
 102 }
 103
 104 static inline void vcpu_set_wfx_traps(struct kvm_vcpu *vcpu)
 105 {
 106         vcpu->arch.hcr_el2 |= HCR_TWE;
 107         vcpu->arch.hcr_el2 |= HCR_TWI;
 108 }
 109
 110 static inline void vcpu_ptrauth_enable(struct kvm_vcpu *vcpu)
 111 {
 112         vcpu->arch.hcr_el2 |= (HCR_API | HCR_APK);
 113 }
 114
 115 static inline void vcpu_ptrauth_disable(struct kvm_vcpu *vcpu)
 116 {
 117         vcpu->arch.hcr_el2 &= ~(HCR_API | HCR_APK);
 118 }
 119
 120 static inline unsigned long vcpu_get_vsesr(struct kvm_vcpu *vcpu)
 121 {
 122         return vcpu->arch.vsesr_el2;
 123 }
 124
 125 static inline void vcpu_set_vsesr(struct kvm_vcpu *vcpu, u64 vsesr)
 126 {
 127         vcpu->arch.vsesr_el2 = vsesr;
 128 }
 129
 130 static __always_inline unsigned long *vcpu_pc(const struct kvm_vcpu *vcpu)
 131 {
 132         return (unsigned long *)&vcpu_gp_regs(vcpu)->pc;
 133 }
 134
 135 static __always_inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu)
 136 {
 137         return (unsigned long *)&vcpu_gp_regs(vcpu)->pstate;
 138 }
 139
 140 static __always_inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu)
 141 {
 142         return !!(*vcpu_cpsr(vcpu) & PSR_MODE32_BIT);
 143 }
 144
 145 static __always_inline bool kvm_condition_valid(const struct kvm_vcpu *vcpu)
 146 {
 147         if (vcpu_mode_is_32bit(vcpu))
 148                 return kvm_condition_valid32(vcpu);
 149
 150         return true;
 151 }
 152
 153 static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu)
 154 {
 155         *vcpu_cpsr(vcpu) |= PSR_AA32_T_BIT;
 156 }
 157
 158 /*
 159  * vcpu_get_reg and vcpu_set_reg should always be passed a register number
 160  * coming from a read of ESR_EL2. Otherwise, it may give the wrong result on
 161  * AArch32 with banked registers.
 162  */
 163 static __always_inline unsigned long vcpu_get_reg(const struct kvm_vcpu *vcpu,
 164                                          u8 reg_num)
 165 {
 166         return (reg_num == 31) ? 0 : vcpu_gp_regs(vcpu)->regs[reg_num];
 167 }
 168
 169 static __always_inline void vcpu_set_reg(struct kvm_vcpu *vcpu, u8 reg_num,
 170                                 unsigned long val)
 171 {
 172         if (reg_num != 31)
 173                 vcpu_gp_regs(vcpu)->regs[reg_num] = val;
 174 }
 175
 176 /*
 177  * The layout of SPSR for an AArch32 state is different when observed from an
 178  * AArch64 SPSR_ELx or an AArch32 SPSR_*. This function generates the AArch32
 179  * view given an AArch64 view.
 180  *
 181  * In ARM DDI 0487E.a see:
 182  *
 183  * - The AArch64 view (SPSR_EL2) in section C5.2.18, page C5-426
 184  * - The AArch32 view (SPSR_abt) in section G8.2.126, page G8-6256
 185  * - The AArch32 view (SPSR_und) in section G8.2.132, page G8-6280
 186  *
 187  * Which show the following differences:
 188  *
 189  * | Bit | AA64 | AA32 | Notes                       |
 190  * +-----+------+------+-----------------------------|
 191  * | 24  | DIT  | J    | J is RES0 in ARMv8          |
 192  * | 21  | SS   | DIT  | SS doesn't exist in AArch32 |
 193  *
 194  * ... and all other bits are (currently) common.
 195  */
 196 static inline unsigned long host_spsr_to_spsr32(unsigned long spsr)
 197 {
 198         const unsigned long overlap = BIT(24) | BIT(21);
 199         unsigned long dit = !!(spsr & PSR_AA32_DIT_BIT);
 200
 201         spsr &= ~overlap;
 202
 203         spsr |= dit << 21;
 204
 205         return spsr;
 206 }
 207
 208 static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu)
 209 {
 210         u32 mode;
 211
 212         if (vcpu_mode_is_32bit(vcpu)) {
 213                 mode = *vcpu_cpsr(vcpu) & PSR_AA32_MODE_MASK;
 214                 return mode > PSR_AA32_MODE_USR;
 215         }
 216
 217         mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK;
 218
 219         return mode != PSR_MODE_EL0t;
 220 }
 221
 222 static __always_inline u32 kvm_vcpu_get_esr(const struct kvm_vcpu *vcpu)
 223 {
 224         return vcpu->arch.fault.esr_el2;
 225 }
 226
 227 static __always_inline int kvm_vcpu_get_condition(const struct kvm_vcpu *vcpu)
 228 {
 229         u32 esr = kvm_vcpu_get_esr(vcpu);
 230
 231         if (esr & ESR_ELx_CV)
 232                 return (esr & ESR_ELx_COND_MASK) >> ESR_ELx_COND_SHIFT;
 233
 234         return -1;
 235 }
 236
 237 static __always_inline unsigned long kvm_vcpu_get_hfar(const struct kvm_vcpu *vcpu)
 238 {
 239         return vcpu->arch.fault.far_el2;
 240 }
 241
 242 static __always_inline phys_addr_t kvm_vcpu_get_fault_ipa(const struct kvm_vcpu *vcpu)
 243 {
 244         return ((phys_addr_t)vcpu->arch.fault.hpfar_el2 & HPFAR_MASK) << 8;
 245 }
 246
 247 static inline u64 kvm_vcpu_get_disr(const struct kvm_vcpu *vcpu)
 248 {
 249         return vcpu->arch.fault.disr_el1;
 250 }
 251
 252 static inline u32 kvm_vcpu_hvc_get_imm(const struct kvm_vcpu *vcpu)
 253 {
 254         return kvm_vcpu_get_esr(vcpu) & ESR_ELx_xVC_IMM_MASK;
 255 }
 256
 257 static __always_inline bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu)
 258 {
 259         return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_ISV);
 260 }
 261
 262 static inline unsigned long kvm_vcpu_dabt_iss_nisv_sanitized(const struct kvm_vcpu *vcpu)
 263 {
 264         return kvm_vcpu_get_esr(vcpu) & (ESR_ELx_CM | ESR_ELx_WNR | ESR_ELx_FSC);
 265 }
 266
 267 static inline bool kvm_vcpu_dabt_issext(const struct kvm_vcpu *vcpu)
 268 {
 269         return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_SSE);
 270 }
 271
 272 static inline bool kvm_vcpu_dabt_issf(const struct kvm_vcpu *vcpu)
 273 {
 274         return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_SF);
 275 }
 276
 277 static __always_inline int kvm_vcpu_dabt_get_rd(const struct kvm_vcpu *vcpu)
 278 {
 279         return (kvm_vcpu_get_esr(vcpu) & ESR_ELx_SRT_MASK) >> ESR_ELx_SRT_SHIFT;
 280 }
 281
 282 static __always_inline bool kvm_vcpu_abt_iss1tw(const struct kvm_vcpu *vcpu)
 283 {
 284         return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_S1PTW);
 285 }
 286
 287 /* Always check for S1PTW *before* using this. */
 288 static __always_inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu)
 289 {
 290         return kvm_vcpu_get_esr(vcpu) & ESR_ELx_WNR;
 291 }
 292
 293 static inline bool kvm_vcpu_dabt_is_cm(const struct kvm_vcpu *vcpu)
 294 {
 295         return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_CM);
 296 }
 297
 298 static __always_inline unsigned int kvm_vcpu_dabt_get_as(const struct kvm_vcpu *vcpu)
 299 {
 300         return 1 << ((kvm_vcpu_get_esr(vcpu) & ESR_ELx_SAS) >> ESR_ELx_SAS_SHIFT);
 301 }
 302
 303 /* This one is not specific to Data Abort */
 304 static __always_inline bool kvm_vcpu_trap_il_is32bit(const struct kvm_vcpu *vcpu)
 305 {
 306         return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_IL);
 307 }
 308
 309 static __always_inline u8 kvm_vcpu_trap_get_class(const struct kvm_vcpu *vcpu)
 310 {
 311         return ESR_ELx_EC(kvm_vcpu_get_esr(vcpu));
 312 }
 313
 314 static inline bool kvm_vcpu_trap_is_iabt(const struct kvm_vcpu *vcpu)
 315 {
 316         return kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_IABT_LOW;
 317 }
 318
 319 static inline bool kvm_vcpu_trap_is_exec_fault(const struct kvm_vcpu *vcpu)
 320 {
 321         return kvm_vcpu_trap_is_iabt(vcpu) && !kvm_vcpu_abt_iss1tw(vcpu);
 322 }
 323
 324 static __always_inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu)
 325 {
 326         return kvm_vcpu_get_esr(vcpu) & ESR_ELx_FSC;
 327 }
 328
 329 static __always_inline u8 kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu *vcpu)
 330 {
 331         return kvm_vcpu_get_esr(vcpu) & ESR_ELx_FSC_TYPE;
 332 }
 333
 334 static __always_inline u8 kvm_vcpu_trap_get_fault_level(const struct kvm_vcpu *vcpu)
 335 {
 336         return kvm_vcpu_get_esr(vcpu) & ESR_ELx_FSC_LEVEL;
 337 }
 338
 339 static __always_inline bool kvm_vcpu_abt_issea(const struct kvm_vcpu *vcpu)
 340 {
 341         switch (kvm_vcpu_trap_get_fault(vcpu)) {
 342         case FSC_SEA:
 343         case FSC_SEA_TTW0:
 344         case FSC_SEA_TTW1:
 345         case FSC_SEA_TTW2:
 346         case FSC_SEA_TTW3:
 347         case FSC_SECC:
 348         case FSC_SECC_TTW0:
 349         case FSC_SECC_TTW1:
 350         case FSC_SECC_TTW2:
 351         case FSC_SECC_TTW3:
 352                 return true;
 353         default:
 354                 return false;
 355         }
 356 }
 357
 358 static __always_inline int kvm_vcpu_sys_get_rt(struct kvm_vcpu *vcpu)
 359 {
 360         u32 esr = kvm_vcpu_get_esr(vcpu);
 361         return ESR_ELx_SYS64_ISS_RT(esr);
 362 }
 363
 364 static inline bool kvm_is_write_fault(struct kvm_vcpu *vcpu)
 365 {
 366         if (kvm_vcpu_abt_iss1tw(vcpu))
 367                 return true;
 368
 369         if (kvm_vcpu_trap_is_iabt(vcpu))
 370                 return false;
 371
 372         return kvm_vcpu_dabt_iswrite(vcpu);
 373 }
 374
 375 static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu)
 376 {
 377         return vcpu_read_sys_reg(vcpu, MPIDR_EL1) & MPIDR_HWID_BITMASK;
 378 }
 379
 380 static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu)
 381 {
 382         if (vcpu_mode_is_32bit(vcpu)) {
 383                 *vcpu_cpsr(vcpu) |= PSR_AA32_E_BIT;
 384         } else {
 385                 u64 sctlr = vcpu_read_sys_reg(vcpu, SCTLR_EL1);
 386                 sctlr |= (1 << 25);
 387                 vcpu_write_sys_reg(vcpu, sctlr, SCTLR_EL1);
 388         }
 389 }
 390
 391 static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu)
 392 {
 393         if (vcpu_mode_is_32bit(vcpu))
 394                 return !!(*vcpu_cpsr(vcpu) & PSR_AA32_E_BIT);
 395
 396         return !!(vcpu_read_sys_reg(vcpu, SCTLR_EL1) & (1 << 25));
 397 }
 398
 399 static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu,
 400                                                     unsigned long data,
 401                                                     unsigned int len)
 402 {
 403         if (kvm_vcpu_is_be(vcpu)) {
 404                 switch (len) {
 405                 case 1:
 406                         return data & 0xff;
 407                 case 2:
 408                         return be16_to_cpu(data & 0xffff);
 409                 case 4:
 410                         return be32_to_cpu(data & 0xffffffff);
 411                 default:
 412                         return be64_to_cpu(data);
 413                 }
 414         } else {
 415                 switch (len) {
 416                 case 1:
 417                         return data & 0xff;
 418                 case 2:
 419                         return le16_to_cpu(data & 0xffff);
 420                 case 4:
 421                         return le32_to_cpu(data & 0xffffffff);
 422                 default:
 423                         return le64_to_cpu(data);
 424                 }
 425         }
 426
 427         return data;            /* Leave LE untouched */
 428 }
 429
 430 static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
 431                                                     unsigned long data,
 432                                                     unsigned int len)
 433 {
 434         if (kvm_vcpu_is_be(vcpu)) {
 435                 switch (len) {
 436                 case 1:
 437                         return data & 0xff;
 438                 case 2:
 439                         return cpu_to_be16(data & 0xffff);
 440                 case 4:
 441                         return cpu_to_be32(data & 0xffffffff);
 442                 default:
 443                         return cpu_to_be64(data);
 444                 }
 445         } else {
 446                 switch (len) {
 447                 case 1:
 448                         return data & 0xff;
 449                 case 2:
 450                         return cpu_to_le16(data & 0xffff);
 451                 case 4:
 452                         return cpu_to_le32(data & 0xffffffff);
 453                 default:
 454                         return cpu_to_le64(data);
 455                 }
 456         }
 457
 458         return data;            /* Leave LE untouched */
 459 }
 460
 461 static __always_inline void kvm_incr_pc(struct kvm_vcpu *vcpu)
 462 {
 463         vcpu->arch.flags |= KVM_ARM64_INCREMENT_PC;
 464 }
 465
 466 #endif /* __ARM64_KVM_EMULATE_H__ */