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/kvm_mmio.h>
  21 #include <asm/ptrace.h>
  22 #include <asm/cputype.h>
  23 #include <asm/virt.h>
  24
  25 unsigned long *vcpu_reg32(const struct kvm_vcpu *vcpu, u8 reg_num);
  26 unsigned long vcpu_read_spsr32(const struct kvm_vcpu *vcpu);
  27 void vcpu_write_spsr32(struct kvm_vcpu *vcpu, unsigned long v);
  28
  29 bool kvm_condition_valid32(const struct kvm_vcpu *vcpu);
  30 void kvm_skip_instr32(struct kvm_vcpu *vcpu, bool is_wide_instr);
  31
  32 void kvm_inject_undefined(struct kvm_vcpu *vcpu);
  33 void kvm_inject_vabt(struct kvm_vcpu *vcpu);
  34 void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr);
  35 void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
  36 void kvm_inject_undef32(struct kvm_vcpu *vcpu);
  37 void kvm_inject_dabt32(struct kvm_vcpu *vcpu, unsigned long addr);
  38 void kvm_inject_pabt32(struct kvm_vcpu *vcpu, unsigned long addr);
  39
  40 static inline bool vcpu_el1_is_32bit(struct kvm_vcpu *vcpu)
  41 {
  42         return !(vcpu->arch.hcr_el2 & HCR_RW);
  43 }
  44
  45 static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu)
  46 {
  47         vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS;
  48         if (is_kernel_in_hyp_mode())
  49                 vcpu->arch.hcr_el2 |= HCR_E2H;
  50         if (cpus_have_const_cap(ARM64_HAS_RAS_EXTN)) {
  51                 /* route synchronous external abort exceptions to EL2 */
  52                 vcpu->arch.hcr_el2 |= HCR_TEA;
  53                 /* trap error record accesses */
  54                 vcpu->arch.hcr_el2 |= HCR_TERR;
  55         }
  56         if (cpus_have_const_cap(ARM64_HAS_STAGE2_FWB))
  57                 vcpu->arch.hcr_el2 |= HCR_FWB;
  58
  59         if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features))
  60                 vcpu->arch.hcr_el2 &= ~HCR_RW;
  61
  62         /*
  63          * TID3: trap feature register accesses that we virtualise.
  64          * For now this is conditional, since no AArch32 feature regs
  65          * are currently virtualised.
  66          */
  67         if (!vcpu_el1_is_32bit(vcpu))
  68                 vcpu->arch.hcr_el2 |= HCR_TID3;
  69
  70         if (cpus_have_const_cap(ARM64_MISMATCHED_CACHE_TYPE) ||
  71             vcpu_el1_is_32bit(vcpu))
  72                 vcpu->arch.hcr_el2 |= HCR_TID2;
  73 }
  74
  75 static inline unsigned long *vcpu_hcr(struct kvm_vcpu *vcpu)
  76 {
  77         return (unsigned long *)&vcpu->arch.hcr_el2;
  78 }
  79
  80 static inline void vcpu_clear_wfe_traps(struct kvm_vcpu *vcpu)
  81 {
  82         vcpu->arch.hcr_el2 &= ~HCR_TWE;
  83 }
  84
  85 static inline void vcpu_set_wfe_traps(struct kvm_vcpu *vcpu)
  86 {
  87         vcpu->arch.hcr_el2 |= HCR_TWE;
  88 }
  89
  90 static inline void vcpu_ptrauth_enable(struct kvm_vcpu *vcpu)
  91 {
  92         vcpu->arch.hcr_el2 |= (HCR_API | HCR_APK);
  93 }
  94
  95 static inline void vcpu_ptrauth_disable(struct kvm_vcpu *vcpu)
  96 {
  97         vcpu->arch.hcr_el2 &= ~(HCR_API | HCR_APK);
  98 }
  99
 100 static inline void vcpu_ptrauth_setup_lazy(struct kvm_vcpu *vcpu)
 101 {
 102         if (vcpu_has_ptrauth(vcpu))
 103                 vcpu_ptrauth_disable(vcpu);
 104 }
 105
 106 static inline unsigned long vcpu_get_vsesr(struct kvm_vcpu *vcpu)
 107 {
 108         return vcpu->arch.vsesr_el2;
 109 }
 110
 111 static inline void vcpu_set_vsesr(struct kvm_vcpu *vcpu, u64 vsesr)
 112 {
 113         vcpu->arch.vsesr_el2 = vsesr;
 114 }
 115
 116 static inline unsigned long *vcpu_pc(const struct kvm_vcpu *vcpu)
 117 {
 118         return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pc;
 119 }
 120
 121 static inline unsigned long *__vcpu_elr_el1(const struct kvm_vcpu *vcpu)
 122 {
 123         return (unsigned long *)&vcpu_gp_regs(vcpu)->elr_el1;
 124 }
 125
 126 static inline unsigned long vcpu_read_elr_el1(const struct kvm_vcpu *vcpu)
 127 {
 128         if (vcpu->arch.sysregs_loaded_on_cpu)
 129                 return read_sysreg_el1(SYS_ELR);
 130         else
 131                 return *__vcpu_elr_el1(vcpu);
 132 }
 133
 134 static inline void vcpu_write_elr_el1(const struct kvm_vcpu *vcpu, unsigned long v)
 135 {
 136         if (vcpu->arch.sysregs_loaded_on_cpu)
 137                 write_sysreg_el1(v, SYS_ELR);
 138         else
 139                 *__vcpu_elr_el1(vcpu) = v;
 140 }
 141
 142 static inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu)
 143 {
 144         return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pstate;
 145 }
 146
 147 static inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu)
 148 {
 149         return !!(*vcpu_cpsr(vcpu) & PSR_MODE32_BIT);
 150 }
 151
 152 static inline bool kvm_condition_valid(const struct kvm_vcpu *vcpu)
 153 {
 154         if (vcpu_mode_is_32bit(vcpu))
 155                 return kvm_condition_valid32(vcpu);
 156
 157         return true;
 158 }
 159
 160 static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu)
 161 {
 162         *vcpu_cpsr(vcpu) |= PSR_AA32_T_BIT;
 163 }
 164
 165 /*
 166  * vcpu_get_reg and vcpu_set_reg should always be passed a register number
 167  * coming from a read of ESR_EL2. Otherwise, it may give the wrong result on
 168  * AArch32 with banked registers.
 169  */
 170 static inline unsigned long vcpu_get_reg(const struct kvm_vcpu *vcpu,
 171                                          u8 reg_num)
 172 {
 173         return (reg_num == 31) ? 0 : vcpu_gp_regs(vcpu)->regs.regs[reg_num];
 174 }
 175
 176 static inline void vcpu_set_reg(struct kvm_vcpu *vcpu, u8 reg_num,
 177                                 unsigned long val)
 178 {
 179         if (reg_num != 31)
 180                 vcpu_gp_regs(vcpu)->regs.regs[reg_num] = val;
 181 }
 182
 183 static inline unsigned long vcpu_read_spsr(const struct kvm_vcpu *vcpu)
 184 {
 185         if (vcpu_mode_is_32bit(vcpu))
 186                 return vcpu_read_spsr32(vcpu);
 187
 188         if (vcpu->arch.sysregs_loaded_on_cpu)
 189                 return read_sysreg_el1(SYS_SPSR);
 190         else
 191                 return vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1];
 192 }
 193
 194 static inline void vcpu_write_spsr(struct kvm_vcpu *vcpu, unsigned long v)
 195 {
 196         if (vcpu_mode_is_32bit(vcpu)) {
 197                 vcpu_write_spsr32(vcpu, v);
 198                 return;
 199         }
 200
 201         if (vcpu->arch.sysregs_loaded_on_cpu)
 202                 write_sysreg_el1(v, SYS_SPSR);
 203         else
 204                 vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1] = v;
 205 }
 206
 207 static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu)
 208 {
 209         u32 mode;
 210
 211         if (vcpu_mode_is_32bit(vcpu)) {
 212                 mode = *vcpu_cpsr(vcpu) & PSR_AA32_MODE_MASK;
 213                 return mode > PSR_AA32_MODE_USR;
 214         }
 215
 216         mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK;
 217
 218         return mode != PSR_MODE_EL0t;
 219 }
 220
 221 static inline u32 kvm_vcpu_get_hsr(const struct kvm_vcpu *vcpu)
 222 {
 223         return vcpu->arch.fault.esr_el2;
 224 }
 225
 226 static inline int kvm_vcpu_get_condition(const struct kvm_vcpu *vcpu)
 227 {
 228         u32 esr = kvm_vcpu_get_hsr(vcpu);
 229
 230         if (esr & ESR_ELx_CV)
 231                 return (esr & ESR_ELx_COND_MASK) >> ESR_ELx_COND_SHIFT;
 232
 233         return -1;
 234 }
 235
 236 static inline unsigned long kvm_vcpu_get_hfar(const struct kvm_vcpu *vcpu)
 237 {
 238         return vcpu->arch.fault.far_el2;
 239 }
 240
 241 static inline phys_addr_t kvm_vcpu_get_fault_ipa(const struct kvm_vcpu *vcpu)
 242 {
 243         return ((phys_addr_t)vcpu->arch.fault.hpfar_el2 & HPFAR_MASK) << 8;
 244 }
 245
 246 static inline u64 kvm_vcpu_get_disr(const struct kvm_vcpu *vcpu)
 247 {
 248         return vcpu->arch.fault.disr_el1;
 249 }
 250
 251 static inline u32 kvm_vcpu_hvc_get_imm(const struct kvm_vcpu *vcpu)
 252 {
 253         return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_xVC_IMM_MASK;
 254 }
 255
 256 static inline bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu)
 257 {
 258         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_ISV);
 259 }
 260
 261 static inline bool kvm_vcpu_dabt_issext(const struct kvm_vcpu *vcpu)
 262 {
 263         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SSE);
 264 }
 265
 266 static inline int kvm_vcpu_dabt_get_rd(const struct kvm_vcpu *vcpu)
 267 {
 268         return (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SRT_MASK) >> ESR_ELx_SRT_SHIFT;
 269 }
 270
 271 static inline bool kvm_vcpu_dabt_iss1tw(const struct kvm_vcpu *vcpu)
 272 {
 273         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_S1PTW);
 274 }
 275
 276 static inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu)
 277 {
 278         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_WNR) ||
 279                 kvm_vcpu_dabt_iss1tw(vcpu); /* AF/DBM update */
 280 }
 281
 282 static inline bool kvm_vcpu_dabt_is_cm(const struct kvm_vcpu *vcpu)
 283 {
 284         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_CM);
 285 }
 286
 287 static inline int kvm_vcpu_dabt_get_as(const struct kvm_vcpu *vcpu)
 288 {
 289         return 1 << ((kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SAS) >> ESR_ELx_SAS_SHIFT);
 290 }
 291
 292 /* This one is not specific to Data Abort */
 293 static inline bool kvm_vcpu_trap_il_is32bit(const struct kvm_vcpu *vcpu)
 294 {
 295         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_IL);
 296 }
 297
 298 static inline u8 kvm_vcpu_trap_get_class(const struct kvm_vcpu *vcpu)
 299 {
 300         return ESR_ELx_EC(kvm_vcpu_get_hsr(vcpu));
 301 }
 302
 303 static inline bool kvm_vcpu_trap_is_iabt(const struct kvm_vcpu *vcpu)
 304 {
 305         return kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_IABT_LOW;
 306 }
 307
 308 static inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu)
 309 {
 310         return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC;
 311 }
 312
 313 static inline u8 kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu *vcpu)
 314 {
 315         return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC_TYPE;
 316 }
 317
 318 static inline bool kvm_vcpu_dabt_isextabt(const struct kvm_vcpu *vcpu)
 319 {
 320         switch (kvm_vcpu_trap_get_fault(vcpu)) {
 321         case FSC_SEA:
 322         case FSC_SEA_TTW0:
 323         case FSC_SEA_TTW1:
 324         case FSC_SEA_TTW2:
 325         case FSC_SEA_TTW3:
 326         case FSC_SECC:
 327         case FSC_SECC_TTW0:
 328         case FSC_SECC_TTW1:
 329         case FSC_SECC_TTW2:
 330         case FSC_SECC_TTW3:
 331                 return true;
 332         default:
 333                 return false;
 334         }
 335 }
 336
 337 static inline int kvm_vcpu_sys_get_rt(struct kvm_vcpu *vcpu)
 338 {
 339         u32 esr = kvm_vcpu_get_hsr(vcpu);
 340         return ESR_ELx_SYS64_ISS_RT(esr);
 341 }
 342
 343 static inline bool kvm_is_write_fault(struct kvm_vcpu *vcpu)
 344 {
 345         if (kvm_vcpu_trap_is_iabt(vcpu))
 346                 return false;
 347
 348         return kvm_vcpu_dabt_iswrite(vcpu);
 349 }
 350
 351 static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu)
 352 {
 353         return vcpu_read_sys_reg(vcpu, MPIDR_EL1) & MPIDR_HWID_BITMASK;
 354 }
 355
 356 static inline bool kvm_arm_get_vcpu_workaround_2_flag(struct kvm_vcpu *vcpu)
 357 {
 358         return vcpu->arch.workaround_flags & VCPU_WORKAROUND_2_FLAG;
 359 }
 360
 361 static inline void kvm_arm_set_vcpu_workaround_2_flag(struct kvm_vcpu *vcpu,
 362                                                       bool flag)
 363 {
 364         if (flag)
 365                 vcpu->arch.workaround_flags |= VCPU_WORKAROUND_2_FLAG;
 366         else
 367                 vcpu->arch.workaround_flags &= ~VCPU_WORKAROUND_2_FLAG;
 368 }
 369
 370 static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu)
 371 {
 372         if (vcpu_mode_is_32bit(vcpu)) {
 373                 *vcpu_cpsr(vcpu) |= PSR_AA32_E_BIT;
 374         } else {
 375                 u64 sctlr = vcpu_read_sys_reg(vcpu, SCTLR_EL1);
 376                 sctlr |= (1 << 25);
 377                 vcpu_write_sys_reg(vcpu, sctlr, SCTLR_EL1);
 378         }
 379 }
 380
 381 static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu)
 382 {
 383         if (vcpu_mode_is_32bit(vcpu))
 384                 return !!(*vcpu_cpsr(vcpu) & PSR_AA32_E_BIT);
 385
 386         return !!(vcpu_read_sys_reg(vcpu, SCTLR_EL1) & (1 << 25));
 387 }
 388
 389 static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu,
 390                                                     unsigned long data,
 391                                                     unsigned int len)
 392 {
 393         if (kvm_vcpu_is_be(vcpu)) {
 394                 switch (len) {
 395                 case 1:
 396                         return data & 0xff;
 397                 case 2:
 398                         return be16_to_cpu(data & 0xffff);
 399                 case 4:
 400                         return be32_to_cpu(data & 0xffffffff);
 401                 default:
 402                         return be64_to_cpu(data);
 403                 }
 404         } else {
 405                 switch (len) {
 406                 case 1:
 407                         return data & 0xff;
 408                 case 2:
 409                         return le16_to_cpu(data & 0xffff);
 410                 case 4:
 411                         return le32_to_cpu(data & 0xffffffff);
 412                 default:
 413                         return le64_to_cpu(data);
 414                 }
 415         }
 416
 417         return data;            /* Leave LE untouched */
 418 }
 419
 420 static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
 421                                                     unsigned long data,
 422                                                     unsigned int len)
 423 {
 424         if (kvm_vcpu_is_be(vcpu)) {
 425                 switch (len) {
 426                 case 1:
 427                         return data & 0xff;
 428                 case 2:
 429                         return cpu_to_be16(data & 0xffff);
 430                 case 4:
 431                         return cpu_to_be32(data & 0xffffffff);
 432                 default:
 433                         return cpu_to_be64(data);
 434                 }
 435         } else {
 436                 switch (len) {
 437                 case 1:
 438                         return data & 0xff;
 439                 case 2:
 440                         return cpu_to_le16(data & 0xffff);
 441                 case 4:
 442                         return cpu_to_le32(data & 0xffffffff);
 443                 default:
 444                         return cpu_to_le64(data);
 445                 }
 446         }
 447
 448         return data;            /* Leave LE untouched */
 449 }
 450
 451 static inline void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr)
 452 {
 453         if (vcpu_mode_is_32bit(vcpu))
 454                 kvm_skip_instr32(vcpu, is_wide_instr);
 455         else
 456                 *vcpu_pc(vcpu) += 4;
 457
 458         /* advance the singlestep state machine */
 459         *vcpu_cpsr(vcpu) &= ~DBG_SPSR_SS;
 460 }
 461
 462 /*
 463  * Skip an instruction which has been emulated at hyp while most guest sysregs
 464  * are live.
 465  */
 466 static inline void __hyp_text __kvm_skip_instr(struct kvm_vcpu *vcpu)
 467 {
 468         *vcpu_pc(vcpu) = read_sysreg_el2(SYS_ELR);
 469         vcpu->arch.ctxt.gp_regs.regs.pstate = read_sysreg_el2(SYS_SPSR);
 470
 471         kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
 472
 473         write_sysreg_el2(vcpu->arch.ctxt.gp_regs.regs.pstate, SYS_SPSR);
 474         write_sysreg_el2(*vcpu_pc(vcpu), SYS_ELR);
 475 }
 476
 477 #endif /* __ARM64_KVM_EMULATE_H__ */