arch/arm64/kvm/sys_regs.c

   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/kvm/coproc.c:
   7  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   8  * Authors: Rusty Russell <rusty@rustcorp.com.au>
   9  *          Christoffer Dall <c.dall@virtualopensystems.com>
  10  */
  11
  12 #include <linux/bsearch.h>
  13 #include <linux/kvm_host.h>
  14 #include <linux/mm.h>
  15 #include <linux/printk.h>
  16 #include <linux/uaccess.h>
  17
  18 #include <asm/cacheflush.h>
  19 #include <asm/cputype.h>
  20 #include <asm/debug-monitors.h>
  21 #include <asm/esr.h>
  22 #include <asm/kvm_arm.h>
  23 #include <asm/kvm_coproc.h>
  24 #include <asm/kvm_emulate.h>
  25 #include <asm/kvm_hyp.h>
  26 #include <asm/kvm_mmu.h>
  27 #include <asm/perf_event.h>
  28 #include <asm/sysreg.h>
  29
  30 #include <trace/events/kvm.h>
  31
  32 #include "sys_regs.h"
  33
  34 #include "trace.h"
  35
  36 /*
  37  * All of this file is extremely similar to the ARM coproc.c, but the
  38  * types are different. My gut feeling is that it should be pretty
  39  * easy to merge, but that would be an ABI breakage -- again. VFP
  40  * would also need to be abstracted.
  41  *
  42  * For AArch32, we only take care of what is being trapped. Anything
  43  * that has to do with init and userspace access has to go via the
  44  * 64bit interface.
  45  */
  46
  47 static bool read_from_write_only(struct kvm_vcpu *vcpu,
  48                                  struct sys_reg_params *params,
  49                                  const struct sys_reg_desc *r)
  50 {
  51         WARN_ONCE(1, "Unexpected sys_reg read to write-only register\n");
  52         print_sys_reg_instr(params);
  53         kvm_inject_undefined(vcpu);
  54         return false;
  55 }
  56
  57 static bool write_to_read_only(struct kvm_vcpu *vcpu,
  58                                struct sys_reg_params *params,
  59                                const struct sys_reg_desc *r)
  60 {
  61         WARN_ONCE(1, "Unexpected sys_reg write to read-only register\n");
  62         print_sys_reg_instr(params);
  63         kvm_inject_undefined(vcpu);
  64         return false;
  65 }
  66
  67 static bool __vcpu_read_sys_reg_from_cpu(int reg, u64 *val)
  68 {
  69         /*
  70          * System registers listed in the switch are not saved on every
  71          * exit from the guest but are only saved on vcpu_put.
  72          *
  73          * Note that MPIDR_EL1 for the guest is set by KVM via VMPIDR_EL2 but
  74          * should never be listed below, because the guest cannot modify its
  75          * own MPIDR_EL1 and MPIDR_EL1 is accessed for VCPU A from VCPU B's
  76          * thread when emulating cross-VCPU communication.
  77          */
  78         switch (reg) {
  79         case CSSELR_EL1:        *val = read_sysreg_s(SYS_CSSELR_EL1);   break;
  80         case SCTLR_EL1:         *val = read_sysreg_s(SYS_SCTLR_EL12);   break;
  81         case CPACR_EL1:         *val = read_sysreg_s(SYS_CPACR_EL12);   break;
  82         case TTBR0_EL1:         *val = read_sysreg_s(SYS_TTBR0_EL12);   break;
  83         case TTBR1_EL1:         *val = read_sysreg_s(SYS_TTBR1_EL12);   break;
  84         case TCR_EL1:           *val = read_sysreg_s(SYS_TCR_EL12);     break;
  85         case ESR_EL1:           *val = read_sysreg_s(SYS_ESR_EL12);     break;
  86         case AFSR0_EL1:         *val = read_sysreg_s(SYS_AFSR0_EL12);   break;
  87         case AFSR1_EL1:         *val = read_sysreg_s(SYS_AFSR1_EL12);   break;
  88         case FAR_EL1:           *val = read_sysreg_s(SYS_FAR_EL12);     break;
  89         case MAIR_EL1:          *val = read_sysreg_s(SYS_MAIR_EL12);    break;
  90         case VBAR_EL1:          *val = read_sysreg_s(SYS_VBAR_EL12);    break;
  91         case CONTEXTIDR_EL1:    *val = read_sysreg_s(SYS_CONTEXTIDR_EL12);break;
  92         case TPIDR_EL0:         *val = read_sysreg_s(SYS_TPIDR_EL0);    break;
  93         case TPIDRRO_EL0:       *val = read_sysreg_s(SYS_TPIDRRO_EL0);  break;
  94         case TPIDR_EL1:         *val = read_sysreg_s(SYS_TPIDR_EL1);    break;
  95         case AMAIR_EL1:         *val = read_sysreg_s(SYS_AMAIR_EL12);   break;
  96         case CNTKCTL_EL1:       *val = read_sysreg_s(SYS_CNTKCTL_EL12); break;
  97         case ELR_EL1:           *val = read_sysreg_s(SYS_ELR_EL12);     break;
  98         case PAR_EL1:           *val = read_sysreg_s(SYS_PAR_EL1);      break;
  99         case DACR32_EL2:        *val = read_sysreg_s(SYS_DACR32_EL2);   break;
 100         case IFSR32_EL2:        *val = read_sysreg_s(SYS_IFSR32_EL2);   break;
 101         case DBGVCR32_EL2:      *val = read_sysreg_s(SYS_DBGVCR32_EL2); break;
 102         default:                return false;
 103         }
 104
 105         return true;
 106 }
 107
 108 static bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
 109 {
 110         /*
 111          * System registers listed in the switch are not restored on every
 112          * entry to the guest but are only restored on vcpu_load.
 113          *
 114          * Note that MPIDR_EL1 for the guest is set by KVM via VMPIDR_EL2 but
 115          * should never be listed below, because the MPIDR should only be set
 116          * once, before running the VCPU, and never changed later.
 117          */
 118         switch (reg) {
 119         case CSSELR_EL1:        write_sysreg_s(val, SYS_CSSELR_EL1);    break;
 120         case SCTLR_EL1:         write_sysreg_s(val, SYS_SCTLR_EL12);    break;
 121         case CPACR_EL1:         write_sysreg_s(val, SYS_CPACR_EL12);    break;
 122         case TTBR0_EL1:         write_sysreg_s(val, SYS_TTBR0_EL12);    break;
 123         case TTBR1_EL1:         write_sysreg_s(val, SYS_TTBR1_EL12);    break;
 124         case TCR_EL1:           write_sysreg_s(val, SYS_TCR_EL12);      break;
 125         case ESR_EL1:           write_sysreg_s(val, SYS_ESR_EL12);      break;
 126         case AFSR0_EL1:         write_sysreg_s(val, SYS_AFSR0_EL12);    break;
 127         case AFSR1_EL1:         write_sysreg_s(val, SYS_AFSR1_EL12);    break;
 128         case FAR_EL1:           write_sysreg_s(val, SYS_FAR_EL12);      break;
 129         case MAIR_EL1:          write_sysreg_s(val, SYS_MAIR_EL12);     break;
 130         case VBAR_EL1:          write_sysreg_s(val, SYS_VBAR_EL12);     break;
 131         case CONTEXTIDR_EL1:    write_sysreg_s(val, SYS_CONTEXTIDR_EL12);break;
 132         case TPIDR_EL0:         write_sysreg_s(val, SYS_TPIDR_EL0);     break;
 133         case TPIDRRO_EL0:       write_sysreg_s(val, SYS_TPIDRRO_EL0);   break;
 134         case TPIDR_EL1:         write_sysreg_s(val, SYS_TPIDR_EL1);     break;
 135         case AMAIR_EL1:         write_sysreg_s(val, SYS_AMAIR_EL12);    break;
 136         case CNTKCTL_EL1:       write_sysreg_s(val, SYS_CNTKCTL_EL12);  break;
 137         case ELR_EL1:           write_sysreg_s(val, SYS_ELR_EL12);      break;
 138         case PAR_EL1:           write_sysreg_s(val, SYS_PAR_EL1);       break;
 139         case DACR32_EL2:        write_sysreg_s(val, SYS_DACR32_EL2);    break;
 140         case IFSR32_EL2:        write_sysreg_s(val, SYS_IFSR32_EL2);    break;
 141         case DBGVCR32_EL2:      write_sysreg_s(val, SYS_DBGVCR32_EL2);  break;
 142         default:                return false;
 143         }
 144
 145         return true;
 146 }
 147
 148 u64 vcpu_read_sys_reg(const struct kvm_vcpu *vcpu, int reg)
 149 {
 150         u64 val = 0x8badf00d8badf00d;
 151
 152         if (vcpu->arch.sysregs_loaded_on_cpu &&
 153             __vcpu_read_sys_reg_from_cpu(reg, &val))
 154                 return val;
 155
 156         return __vcpu_sys_reg(vcpu, reg);
 157 }
 158
 159 void vcpu_write_sys_reg(struct kvm_vcpu *vcpu, u64 val, int reg)
 160 {
 161         if (vcpu->arch.sysregs_loaded_on_cpu &&
 162             __vcpu_write_sys_reg_to_cpu(val, reg))
 163                 return;
 164
 165          __vcpu_sys_reg(vcpu, reg) = val;
 166 }
 167
 168 /* 3 bits per cache level, as per CLIDR, but non-existent caches always 0 */
 169 static u32 cache_levels;
 170
 171 /* CSSELR values; used to index KVM_REG_ARM_DEMUX_ID_CCSIDR */
 172 #define CSSELR_MAX 12
 173
 174 /* Which cache CCSIDR represents depends on CSSELR value. */
 175 static u32 get_ccsidr(u32 csselr)
 176 {
 177         u32 ccsidr;
 178
 179         /* Make sure noone else changes CSSELR during this! */
 180         local_irq_disable();
 181         write_sysreg(csselr, csselr_el1);
 182         isb();
 183         ccsidr = read_sysreg(ccsidr_el1);
 184         local_irq_enable();
 185
 186         return ccsidr;
 187 }
 188
 189 /*
 190  * See note at ARMv7 ARM B1.14.4 (TL;DR: S/W ops are not easily virtualized).
 191  */
 192 static bool access_dcsw(struct kvm_vcpu *vcpu,
 193                         struct sys_reg_params *p,
 194                         const struct sys_reg_desc *r)
 195 {
 196         if (!p->is_write)
 197                 return read_from_write_only(vcpu, p, r);
 198
 199         /*
 200          * Only track S/W ops if we don't have FWB. It still indicates
 201          * that the guest is a bit broken (S/W operations should only
 202          * be done by firmware, knowing that there is only a single
 203          * CPU left in the system, and certainly not from non-secure
 204          * software).
 205          */
 206         if (!cpus_have_const_cap(ARM64_HAS_STAGE2_FWB))
 207                 kvm_set_way_flush(vcpu);
 208
 209         return true;
 210 }
 211
 212 /*
 213  * Generic accessor for VM registers. Only called as long as HCR_TVM
 214  * is set. If the guest enables the MMU, we stop trapping the VM
 215  * sys_regs and leave it in complete control of the caches.
 216  */
 217 static bool access_vm_reg(struct kvm_vcpu *vcpu,
 218                           struct sys_reg_params *p,
 219                           const struct sys_reg_desc *r)
 220 {
 221         bool was_enabled = vcpu_has_cache_enabled(vcpu);
 222         u64 val;
 223         int reg = r->reg;
 224
 225         BUG_ON(!p->is_write);
 226
 227         /* See the 32bit mapping in kvm_host.h */
 228         if (p->is_aarch32)
 229                 reg = r->reg / 2;
 230
 231         if (!p->is_aarch32 || !p->is_32bit) {
 232                 val = p->regval;
 233         } else {
 234                 val = vcpu_read_sys_reg(vcpu, reg);
 235                 if (r->reg % 2)
 236                         val = (p->regval << 32) | (u64)lower_32_bits(val);
 237                 else
 238                         val = ((u64)upper_32_bits(val) << 32) |
 239                                 lower_32_bits(p->regval);
 240         }
 241         vcpu_write_sys_reg(vcpu, val, reg);
 242
 243         kvm_toggle_cache(vcpu, was_enabled);
 244         return true;
 245 }
 246
 247 static bool access_actlr(struct kvm_vcpu *vcpu,
 248                          struct sys_reg_params *p,
 249                          const struct sys_reg_desc *r)
 250 {
 251         if (p->is_write)
 252                 return ignore_write(vcpu, p);
 253
 254         p->regval = vcpu_read_sys_reg(vcpu, ACTLR_EL1);
 255
 256         if (p->is_aarch32) {
 257                 if (r->Op2 & 2)
 258                         p->regval = upper_32_bits(p->regval);
 259                 else
 260                         p->regval = lower_32_bits(p->regval);
 261         }
 262
 263         return true;
 264 }
 265
 266 /*
 267  * Trap handler for the GICv3 SGI generation system register.
 268  * Forward the request to the VGIC emulation.
 269  * The cp15_64 code makes sure this automatically works
 270  * for both AArch64 and AArch32 accesses.
 271  */
 272 static bool access_gic_sgi(struct kvm_vcpu *vcpu,
 273                            struct sys_reg_params *p,
 274                            const struct sys_reg_desc *r)
 275 {
 276         bool g1;
 277
 278         if (!p->is_write)
 279                 return read_from_write_only(vcpu, p, r);
 280
 281         /*
 282          * In a system where GICD_CTLR.DS=1, a ICC_SGI0R_EL1 access generates
 283          * Group0 SGIs only, while ICC_SGI1R_EL1 can generate either group,
 284          * depending on the SGI configuration. ICC_ASGI1R_EL1 is effectively
 285          * equivalent to ICC_SGI0R_EL1, as there is no "alternative" secure
 286          * group.
 287          */
 288         if (p->is_aarch32) {
 289                 switch (p->Op1) {
 290                 default:                /* Keep GCC quiet */
 291                 case 0:                 /* ICC_SGI1R */
 292                         g1 = true;
 293                         break;
 294                 case 1:                 /* ICC_ASGI1R */
 295                 case 2:                 /* ICC_SGI0R */
 296                         g1 = false;
 297                         break;
 298                 }
 299         } else {
 300                 switch (p->Op2) {
 301                 default:                /* Keep GCC quiet */
 302                 case 5:                 /* ICC_SGI1R_EL1 */
 303                         g1 = true;
 304                         break;
 305                 case 6:                 /* ICC_ASGI1R_EL1 */
 306                 case 7:                 /* ICC_SGI0R_EL1 */
 307                         g1 = false;
 308                         break;
 309                 }
 310         }
 311
 312         vgic_v3_dispatch_sgi(vcpu, p->regval, g1);
 313
 314         return true;
 315 }
 316
 317 static bool access_gic_sre(struct kvm_vcpu *vcpu,
 318                            struct sys_reg_params *p,
 319                            const struct sys_reg_desc *r)
 320 {
 321         if (p->is_write)
 322                 return ignore_write(vcpu, p);
 323
 324         p->regval = vcpu->arch.vgic_cpu.vgic_v3.vgic_sre;
 325         return true;
 326 }
 327
 328 static bool trap_raz_wi(struct kvm_vcpu *vcpu,
 329                         struct sys_reg_params *p,
 330                         const struct sys_reg_desc *r)
 331 {
 332         if (p->is_write)
 333                 return ignore_write(vcpu, p);
 334         else
 335                 return read_zero(vcpu, p);
 336 }
 337
 338 /*
 339  * ARMv8.1 mandates at least a trivial LORegion implementation, where all the
 340  * RW registers are RES0 (which we can implement as RAZ/WI). On an ARMv8.0
 341  * system, these registers should UNDEF. LORID_EL1 being a RO register, we
 342  * treat it separately.
 343  */
 344 static bool trap_loregion(struct kvm_vcpu *vcpu,
 345                           struct sys_reg_params *p,
 346                           const struct sys_reg_desc *r)
 347 {
 348         u64 val = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1);
 349         u32 sr = sys_reg((u32)r->Op0, (u32)r->Op1,
 350                          (u32)r->CRn, (u32)r->CRm, (u32)r->Op2);
 351
 352         if (!(val & (0xfUL << ID_AA64MMFR1_LOR_SHIFT))) {
 353                 kvm_inject_undefined(vcpu);
 354                 return false;
 355         }
 356
 357         if (p->is_write && sr == SYS_LORID_EL1)
 358                 return write_to_read_only(vcpu, p, r);
 359
 360         return trap_raz_wi(vcpu, p, r);
 361 }
 362
 363 static bool trap_oslsr_el1(struct kvm_vcpu *vcpu,
 364                            struct sys_reg_params *p,
 365                            const struct sys_reg_desc *r)
 366 {
 367         if (p->is_write) {
 368                 return ignore_write(vcpu, p);
 369         } else {
 370                 p->regval = (1 << 3);
 371                 return true;
 372         }
 373 }
 374
 375 static bool trap_dbgauthstatus_el1(struct kvm_vcpu *vcpu,
 376                                    struct sys_reg_params *p,
 377                                    const struct sys_reg_desc *r)
 378 {
 379         if (p->is_write) {
 380                 return ignore_write(vcpu, p);
 381         } else {
 382                 p->regval = read_sysreg(dbgauthstatus_el1);
 383                 return true;
 384         }
 385 }
 386
 387 /*
 388  * We want to avoid world-switching all the DBG registers all the
 389  * time:
 390  *
 391  * - If we've touched any debug register, it is likely that we're
 392  *   going to touch more of them. It then makes sense to disable the
 393  *   traps and start doing the save/restore dance
 394  * - If debug is active (DBG_MDSCR_KDE or DBG_MDSCR_MDE set), it is
 395  *   then mandatory to save/restore the registers, as the guest
 396  *   depends on them.
 397  *
 398  * For this, we use a DIRTY bit, indicating the guest has modified the
 399  * debug registers, used as follow:
 400  *
 401  * On guest entry:
 402  * - If the dirty bit is set (because we're coming back from trapping),
 403  *   disable the traps, save host registers, restore guest registers.
 404  * - If debug is actively in use (DBG_MDSCR_KDE or DBG_MDSCR_MDE set),
 405  *   set the dirty bit, disable the traps, save host registers,
 406  *   restore guest registers.
 407  * - Otherwise, enable the traps
 408  *
 409  * On guest exit:
 410  * - If the dirty bit is set, save guest registers, restore host
 411  *   registers and clear the dirty bit. This ensure that the host can
 412  *   now use the debug registers.
 413  */
 414 static bool trap_debug_regs(struct kvm_vcpu *vcpu,
 415                             struct sys_reg_params *p,
 416                             const struct sys_reg_desc *r)
 417 {
 418         if (p->is_write) {
 419                 vcpu_write_sys_reg(vcpu, p->regval, r->reg);
 420                 vcpu->arch.flags |= KVM_ARM64_DEBUG_DIRTY;
 421         } else {
 422                 p->regval = vcpu_read_sys_reg(vcpu, r->reg);
 423         }
 424
 425         trace_trap_reg(__func__, r->reg, p->is_write, p->regval);
 426
 427         return true;
 428 }
 429
 430 /*
 431  * reg_to_dbg/dbg_to_reg
 432  *
 433  * A 32 bit write to a debug register leave top bits alone
 434  * A 32 bit read from a debug register only returns the bottom bits
 435  *
 436  * All writes will set the KVM_ARM64_DEBUG_DIRTY flag to ensure the
 437  * hyp.S code switches between host and guest values in future.
 438  */
 439 static void reg_to_dbg(struct kvm_vcpu *vcpu,
 440                        struct sys_reg_params *p,
 441                        u64 *dbg_reg)
 442 {
 443         u64 val = p->regval;
 444
 445         if (p->is_32bit) {
 446                 val &= 0xffffffffUL;
 447                 val |= ((*dbg_reg >> 32) << 32);
 448         }
 449
 450         *dbg_reg = val;
 451         vcpu->arch.flags |= KVM_ARM64_DEBUG_DIRTY;
 452 }
 453
 454 static void dbg_to_reg(struct kvm_vcpu *vcpu,
 455                        struct sys_reg_params *p,
 456                        u64 *dbg_reg)
 457 {
 458         p->regval = *dbg_reg;
 459         if (p->is_32bit)
 460                 p->regval &= 0xffffffffUL;
 461 }
 462
 463 static bool trap_bvr(struct kvm_vcpu *vcpu,
 464                      struct sys_reg_params *p,
 465                      const struct sys_reg_desc *rd)
 466 {
 467         u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg];
 468
 469         if (p->is_write)
 470                 reg_to_dbg(vcpu, p, dbg_reg);
 471         else
 472                 dbg_to_reg(vcpu, p, dbg_reg);
 473
 474         trace_trap_reg(__func__, rd->reg, p->is_write, *dbg_reg);
 475
 476         return true;
 477 }
 478
 479 static int set_bvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
 480                 const struct kvm_one_reg *reg, void __user *uaddr)
 481 {
 482         __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg];
 483
 484         if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0)
 485                 return -EFAULT;
 486         return 0;
 487 }
 488
 489 static int get_bvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
 490         const struct kvm_one_reg *reg, void __user *uaddr)
 491 {
 492         __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg];
 493
 494         if (copy_to_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0)
 495                 return -EFAULT;
 496         return 0;
 497 }
 498
 499 static void reset_bvr(struct kvm_vcpu *vcpu,
 500                       const struct sys_reg_desc *rd)
 501 {
 502         vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg] = rd->val;
 503 }
 504
 505 static bool trap_bcr(struct kvm_vcpu *vcpu,
 506                      struct sys_reg_params *p,
 507                      const struct sys_reg_desc *rd)
 508 {
 509         u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg];
 510
 511         if (p->is_write)
 512                 reg_to_dbg(vcpu, p, dbg_reg);
 513         else
 514                 dbg_to_reg(vcpu, p, dbg_reg);
 515
 516         trace_trap_reg(__func__, rd->reg, p->is_write, *dbg_reg);
 517
 518         return true;
 519 }
 520
 521 static int set_bcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
 522                 const struct kvm_one_reg *reg, void __user *uaddr)
 523 {
 524         __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg];
 525
 526         if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0)
 527                 return -EFAULT;
 528
 529         return 0;
 530 }
 531
 532 static int get_bcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
 533         const struct kvm_one_reg *reg, void __user *uaddr)
 534 {
 535         __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg];
 536
 537         if (copy_to_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0)
 538                 return -EFAULT;
 539         return 0;
 540 }
 541
 542 static void reset_bcr(struct kvm_vcpu *vcpu,
 543                       const struct sys_reg_desc *rd)
 544 {
 545         vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg] = rd->val;
 546 }
 547
 548 static bool trap_wvr(struct kvm_vcpu *vcpu,
 549                      struct sys_reg_params *p,
 550                      const struct sys_reg_desc *rd)
 551 {
 552         u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg];
 553
 554         if (p->is_write)
 555                 reg_to_dbg(vcpu, p, dbg_reg);
 556         else
 557                 dbg_to_reg(vcpu, p, dbg_reg);
 558
 559         trace_trap_reg(__func__, rd->reg, p->is_write,
 560                 vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg]);
 561
 562         return true;
 563 }
 564
 565 static int set_wvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
 566                 const struct kvm_one_reg *reg, void __user *uaddr)
 567 {
 568         __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg];
 569
 570         if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0)
 571                 return -EFAULT;
 572         return 0;
 573 }
 574
 575 static int get_wvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
 576         const struct kvm_one_reg *reg, void __user *uaddr)
 577 {
 578         __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg];
 579
 580         if (copy_to_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0)
 581                 return -EFAULT;
 582         return 0;
 583 }
 584
 585 static void reset_wvr(struct kvm_vcpu *vcpu,
 586                       const struct sys_reg_desc *rd)
 587 {
 588         vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg] = rd->val;
 589 }
 590
 591 static bool trap_wcr(struct kvm_vcpu *vcpu,
 592                      struct sys_reg_params *p,
 593                      const struct sys_reg_desc *rd)
 594 {
 595         u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg];
 596
 597         if (p->is_write)
 598                 reg_to_dbg(vcpu, p, dbg_reg);
 599         else
 600                 dbg_to_reg(vcpu, p, dbg_reg);
 601
 602         trace_trap_reg(__func__, rd->reg, p->is_write, *dbg_reg);
 603
 604         return true;
 605 }
 606
 607 static int set_wcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
 608                 const struct kvm_one_reg *reg, void __user *uaddr)
 609 {
 610         __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg];
 611
 612         if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0)
 613                 return -EFAULT;
 614         return 0;
 615 }
 616
 617 static int get_wcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
 618         const struct kvm_one_reg *reg, void __user *uaddr)
 619 {
 620         __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg];
 621
 622         if (copy_to_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0)
 623                 return -EFAULT;
 624         return 0;
 625 }
 626
 627 static void reset_wcr(struct kvm_vcpu *vcpu,
 628                       const struct sys_reg_desc *rd)
 629 {
 630         vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg] = rd->val;
 631 }
 632
 633 static void reset_amair_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
 634 {
 635         u64 amair = read_sysreg(amair_el1);
 636         vcpu_write_sys_reg(vcpu, amair, AMAIR_EL1);
 637 }
 638
 639 static void reset_actlr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
 640 {
 641         u64 actlr = read_sysreg(actlr_el1);
 642         vcpu_write_sys_reg(vcpu, actlr, ACTLR_EL1);
 643 }
 644
 645 static void reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
 646 {
 647         u64 mpidr;
 648
 649         /*
 650          * Map the vcpu_id into the first three affinity level fields of
 651          * the MPIDR. We limit the number of VCPUs in level 0 due to a
 652          * limitation to 16 CPUs in that level in the ICC_SGIxR registers
 653          * of the GICv3 to be able to address each CPU directly when
 654          * sending IPIs.
 655          */
 656         mpidr = (vcpu->vcpu_id & 0x0f) << MPIDR_LEVEL_SHIFT(0);
 657         mpidr |= ((vcpu->vcpu_id >> 4) & 0xff) << MPIDR_LEVEL_SHIFT(1);
 658         mpidr |= ((vcpu->vcpu_id >> 12) & 0xff) << MPIDR_LEVEL_SHIFT(2);
 659         vcpu_write_sys_reg(vcpu, (1ULL << 31) | mpidr, MPIDR_EL1);
 660 }
 661
 662 static void reset_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
 663 {
 664         u64 pmcr, val;
 665
 666         pmcr = read_sysreg(pmcr_el0);
 667         /*
 668          * Writable bits of PMCR_EL0 (ARMV8_PMU_PMCR_MASK) are reset to UNKNOWN
 669          * except PMCR.E resetting to zero.
 670          */
 671         val = ((pmcr & ~ARMV8_PMU_PMCR_MASK)
 672                | (ARMV8_PMU_PMCR_MASK & 0xdecafbad)) & (~ARMV8_PMU_PMCR_E);
 673         if (!system_supports_32bit_el0())
 674                 val |= ARMV8_PMU_PMCR_LC;
 675         __vcpu_sys_reg(vcpu, r->reg) = val;
 676 }
 677
 678 static bool check_pmu_access_disabled(struct kvm_vcpu *vcpu, u64 flags)
 679 {
 680         u64 reg = __vcpu_sys_reg(vcpu, PMUSERENR_EL0);
 681         bool enabled = (reg & flags) || vcpu_mode_priv(vcpu);
 682
 683         if (!enabled)
 684                 kvm_inject_undefined(vcpu);
 685
 686         return !enabled;
 687 }
 688
 689 static bool pmu_access_el0_disabled(struct kvm_vcpu *vcpu)
 690 {
 691         return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_EN);
 692 }
 693
 694 static bool pmu_write_swinc_el0_disabled(struct kvm_vcpu *vcpu)
 695 {
 696         return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_SW | ARMV8_PMU_USERENR_EN);
 697 }
 698
 699 static bool pmu_access_cycle_counter_el0_disabled(struct kvm_vcpu *vcpu)
 700 {
 701         return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_CR | ARMV8_PMU_USERENR_EN);
 702 }
 703
 704 static bool pmu_access_event_counter_el0_disabled(struct kvm_vcpu *vcpu)
 705 {
 706         return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_ER | ARMV8_PMU_USERENR_EN);
 707 }
 708
 709 static bool access_pmcr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 710                         const struct sys_reg_desc *r)
 711 {
 712         u64 val;
 713
 714         if (!kvm_arm_pmu_v3_ready(vcpu))
 715                 return trap_raz_wi(vcpu, p, r);
 716
 717         if (pmu_access_el0_disabled(vcpu))
 718                 return false;
 719
 720         if (p->is_write) {
 721                 /* Only update writeable bits of PMCR */
 722                 val = __vcpu_sys_reg(vcpu, PMCR_EL0);
 723                 val &= ~ARMV8_PMU_PMCR_MASK;
 724                 val |= p->regval & ARMV8_PMU_PMCR_MASK;
 725                 if (!system_supports_32bit_el0())
 726                         val |= ARMV8_PMU_PMCR_LC;
 727                 __vcpu_sys_reg(vcpu, PMCR_EL0) = val;
 728                 kvm_pmu_handle_pmcr(vcpu, val);
 729                 kvm_vcpu_pmu_restore_guest(vcpu);
 730         } else {
 731                 /* PMCR.P & PMCR.C are RAZ */
 732                 val = __vcpu_sys_reg(vcpu, PMCR_EL0)
 733                       & ~(ARMV8_PMU_PMCR_P | ARMV8_PMU_PMCR_C);
 734                 p->regval = val;
 735         }
 736
 737         return true;
 738 }
 739
 740 static bool access_pmselr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 741                           const struct sys_reg_desc *r)
 742 {
 743         if (!kvm_arm_pmu_v3_ready(vcpu))
 744                 return trap_raz_wi(vcpu, p, r);
 745
 746         if (pmu_access_event_counter_el0_disabled(vcpu))
 747                 return false;
 748
 749         if (p->is_write)
 750                 __vcpu_sys_reg(vcpu, PMSELR_EL0) = p->regval;
 751         else
 752                 /* return PMSELR.SEL field */
 753                 p->regval = __vcpu_sys_reg(vcpu, PMSELR_EL0)
 754                             & ARMV8_PMU_COUNTER_MASK;
 755
 756         return true;
 757 }
 758
 759 static bool access_pmceid(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 760                           const struct sys_reg_desc *r)
 761 {
 762         u64 pmceid;
 763
 764         if (!kvm_arm_pmu_v3_ready(vcpu))
 765                 return trap_raz_wi(vcpu, p, r);
 766
 767         BUG_ON(p->is_write);
 768
 769         if (pmu_access_el0_disabled(vcpu))
 770                 return false;
 771
 772         pmceid = kvm_pmu_get_pmceid(vcpu, (p->Op2 & 1));
 773
 774         p->regval = pmceid;
 775
 776         return true;
 777 }
 778
 779 static bool pmu_counter_idx_valid(struct kvm_vcpu *vcpu, u64 idx)
 780 {
 781         u64 pmcr, val;
 782
 783         pmcr = __vcpu_sys_reg(vcpu, PMCR_EL0);
 784         val = (pmcr >> ARMV8_PMU_PMCR_N_SHIFT) & ARMV8_PMU_PMCR_N_MASK;
 785         if (idx >= val && idx != ARMV8_PMU_CYCLE_IDX) {
 786                 kvm_inject_undefined(vcpu);
 787                 return false;
 788         }
 789
 790         return true;
 791 }
 792
 793 static bool access_pmu_evcntr(struct kvm_vcpu *vcpu,
 794                               struct sys_reg_params *p,
 795                               const struct sys_reg_desc *r)
 796 {
 797         u64 idx;
 798
 799         if (!kvm_arm_pmu_v3_ready(vcpu))
 800                 return trap_raz_wi(vcpu, p, r);
 801
 802         if (r->CRn == 9 && r->CRm == 13) {
 803                 if (r->Op2 == 2) {
 804                         /* PMXEVCNTR_EL0 */
 805                         if (pmu_access_event_counter_el0_disabled(vcpu))
 806                                 return false;
 807
 808                         idx = __vcpu_sys_reg(vcpu, PMSELR_EL0)
 809                               & ARMV8_PMU_COUNTER_MASK;
 810                 } else if (r->Op2 == 0) {
 811                         /* PMCCNTR_EL0 */
 812                         if (pmu_access_cycle_counter_el0_disabled(vcpu))
 813                                 return false;
 814
 815                         idx = ARMV8_PMU_CYCLE_IDX;
 816                 } else {
 817                         return false;
 818                 }
 819         } else if (r->CRn == 0 && r->CRm == 9) {
 820                 /* PMCCNTR */
 821                 if (pmu_access_event_counter_el0_disabled(vcpu))
 822                         return false;
 823
 824                 idx = ARMV8_PMU_CYCLE_IDX;
 825         } else if (r->CRn == 14 && (r->CRm & 12) == 8) {
 826                 /* PMEVCNTRn_EL0 */
 827                 if (pmu_access_event_counter_el0_disabled(vcpu))
 828                         return false;
 829
 830                 idx = ((r->CRm & 3) << 3) | (r->Op2 & 7);
 831         } else {
 832                 return false;
 833         }
 834
 835         if (!pmu_counter_idx_valid(vcpu, idx))
 836                 return false;
 837
 838         if (p->is_write) {
 839                 if (pmu_access_el0_disabled(vcpu))
 840                         return false;
 841
 842                 kvm_pmu_set_counter_value(vcpu, idx, p->regval);
 843         } else {
 844                 p->regval = kvm_pmu_get_counter_value(vcpu, idx);
 845         }
 846
 847         return true;
 848 }
 849
 850 static bool access_pmu_evtyper(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 851                                const struct sys_reg_desc *r)
 852 {
 853         u64 idx, reg;
 854
 855         if (!kvm_arm_pmu_v3_ready(vcpu))
 856                 return trap_raz_wi(vcpu, p, r);
 857
 858         if (pmu_access_el0_disabled(vcpu))
 859                 return false;
 860
 861         if (r->CRn == 9 && r->CRm == 13 && r->Op2 == 1) {
 862                 /* PMXEVTYPER_EL0 */
 863                 idx = __vcpu_sys_reg(vcpu, PMSELR_EL0) & ARMV8_PMU_COUNTER_MASK;
 864                 reg = PMEVTYPER0_EL0 + idx;
 865         } else if (r->CRn == 14 && (r->CRm & 12) == 12) {
 866                 idx = ((r->CRm & 3) << 3) | (r->Op2 & 7);
 867                 if (idx == ARMV8_PMU_CYCLE_IDX)
 868                         reg = PMCCFILTR_EL0;
 869                 else
 870                         /* PMEVTYPERn_EL0 */
 871                         reg = PMEVTYPER0_EL0 + idx;
 872         } else {
 873                 BUG();
 874         }
 875
 876         if (!pmu_counter_idx_valid(vcpu, idx))
 877                 return false;
 878
 879         if (p->is_write) {
 880                 kvm_pmu_set_counter_event_type(vcpu, p->regval, idx);
 881                 __vcpu_sys_reg(vcpu, reg) = p->regval & ARMV8_PMU_EVTYPE_MASK;
 882                 kvm_vcpu_pmu_restore_guest(vcpu);
 883         } else {
 884                 p->regval = __vcpu_sys_reg(vcpu, reg) & ARMV8_PMU_EVTYPE_MASK;
 885         }
 886
 887         return true;
 888 }
 889
 890 static bool access_pmcnten(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 891                            const struct sys_reg_desc *r)
 892 {
 893         u64 val, mask;
 894
 895         if (!kvm_arm_pmu_v3_ready(vcpu))
 896                 return trap_raz_wi(vcpu, p, r);
 897
 898         if (pmu_access_el0_disabled(vcpu))
 899                 return false;
 900
 901         mask = kvm_pmu_valid_counter_mask(vcpu);
 902         if (p->is_write) {
 903                 val = p->regval & mask;
 904                 if (r->Op2 & 0x1) {
 905                         /* accessing PMCNTENSET_EL0 */
 906                         __vcpu_sys_reg(vcpu, PMCNTENSET_EL0) |= val;
 907                         kvm_pmu_enable_counter_mask(vcpu, val);
 908                         kvm_vcpu_pmu_restore_guest(vcpu);
 909                 } else {
 910                         /* accessing PMCNTENCLR_EL0 */
 911                         __vcpu_sys_reg(vcpu, PMCNTENSET_EL0) &= ~val;
 912                         kvm_pmu_disable_counter_mask(vcpu, val);
 913                 }
 914         } else {
 915                 p->regval = __vcpu_sys_reg(vcpu, PMCNTENSET_EL0) & mask;
 916         }
 917
 918         return true;
 919 }
 920
 921 static bool access_pminten(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 922                            const struct sys_reg_desc *r)
 923 {
 924         u64 mask = kvm_pmu_valid_counter_mask(vcpu);
 925
 926         if (!kvm_arm_pmu_v3_ready(vcpu))
 927                 return trap_raz_wi(vcpu, p, r);
 928
 929         if (!vcpu_mode_priv(vcpu)) {
 930                 kvm_inject_undefined(vcpu);
 931                 return false;
 932         }
 933
 934         if (p->is_write) {
 935                 u64 val = p->regval & mask;
 936
 937                 if (r->Op2 & 0x1)
 938                         /* accessing PMINTENSET_EL1 */
 939                         __vcpu_sys_reg(vcpu, PMINTENSET_EL1) |= val;
 940                 else
 941                         /* accessing PMINTENCLR_EL1 */
 942                         __vcpu_sys_reg(vcpu, PMINTENSET_EL1) &= ~val;
 943         } else {
 944                 p->regval = __vcpu_sys_reg(vcpu, PMINTENSET_EL1) & mask;
 945         }
 946
 947         return true;
 948 }
 949
 950 static bool access_pmovs(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 951                          const struct sys_reg_desc *r)
 952 {
 953         u64 mask = kvm_pmu_valid_counter_mask(vcpu);
 954
 955         if (!kvm_arm_pmu_v3_ready(vcpu))
 956                 return trap_raz_wi(vcpu, p, r);
 957
 958         if (pmu_access_el0_disabled(vcpu))
 959                 return false;
 960
 961         if (p->is_write) {
 962                 if (r->CRm & 0x2)
 963                         /* accessing PMOVSSET_EL0 */
 964                         __vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= (p->regval & mask);
 965                 else
 966                         /* accessing PMOVSCLR_EL0 */
 967                         __vcpu_sys_reg(vcpu, PMOVSSET_EL0) &= ~(p->regval & mask);
 968         } else {
 969                 p->regval = __vcpu_sys_reg(vcpu, PMOVSSET_EL0) & mask;
 970         }
 971
 972         return true;
 973 }
 974
 975 static bool access_pmswinc(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 976                            const struct sys_reg_desc *r)
 977 {
 978         u64 mask;
 979
 980         if (!kvm_arm_pmu_v3_ready(vcpu))
 981                 return trap_raz_wi(vcpu, p, r);
 982
 983         if (!p->is_write)
 984                 return read_from_write_only(vcpu, p, r);
 985
 986         if (pmu_write_swinc_el0_disabled(vcpu))
 987                 return false;
 988
 989         mask = kvm_pmu_valid_counter_mask(vcpu);
 990         kvm_pmu_software_increment(vcpu, p->regval & mask);
 991         return true;
 992 }
 993
 994 static bool access_pmuserenr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 995                              const struct sys_reg_desc *r)
 996 {
 997         if (!kvm_arm_pmu_v3_ready(vcpu))
 998                 return trap_raz_wi(vcpu, p, r);
 999
1000         if (p->is_write) {
1001                 if (!vcpu_mode_priv(vcpu)) {
1002                         kvm_inject_undefined(vcpu);
1003                         return false;
1004                 }
1005
1006                 __vcpu_sys_reg(vcpu, PMUSERENR_EL0) =
1007                                p->regval & ARMV8_PMU_USERENR_MASK;
1008         } else {
1009                 p->regval = __vcpu_sys_reg(vcpu, PMUSERENR_EL0)
1010                             & ARMV8_PMU_USERENR_MASK;
1011         }
1012
1013         return true;
1014 }
1015
1016 #define reg_to_encoding(x)                                              \
1017         sys_reg((u32)(x)->Op0, (u32)(x)->Op1,                           \
1018                 (u32)(x)->CRn, (u32)(x)->CRm, (u32)(x)->Op2);
1019
1020 /* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go */
1021 #define DBG_BCR_BVR_WCR_WVR_EL1(n)                                      \
1022         { SYS_DESC(SYS_DBGBVRn_EL1(n)),                                 \
1023           trap_bvr, reset_bvr, 0, 0, get_bvr, set_bvr },                \
1024         { SYS_DESC(SYS_DBGBCRn_EL1(n)),                                 \
1025           trap_bcr, reset_bcr, 0, 0, get_bcr, set_bcr },                \
1026         { SYS_DESC(SYS_DBGWVRn_EL1(n)),                                 \
1027           trap_wvr, reset_wvr, 0, 0,  get_wvr, set_wvr },               \
1028         { SYS_DESC(SYS_DBGWCRn_EL1(n)),                                 \
1029           trap_wcr, reset_wcr, 0, 0,  get_wcr, set_wcr }
1030
1031 /* Macro to expand the PMEVCNTRn_EL0 register */
1032 #define PMU_PMEVCNTR_EL0(n)                                             \
1033         { SYS_DESC(SYS_PMEVCNTRn_EL0(n)),                                       \
1034           access_pmu_evcntr, reset_unknown, (PMEVCNTR0_EL0 + n), }
1035
1036 /* Macro to expand the PMEVTYPERn_EL0 register */
1037 #define PMU_PMEVTYPER_EL0(n)                                            \
1038         { SYS_DESC(SYS_PMEVTYPERn_EL0(n)),                                      \
1039           access_pmu_evtyper, reset_unknown, (PMEVTYPER0_EL0 + n), }
1040
1041 static bool undef_access(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
1042                          const struct sys_reg_desc *r)
1043 {
1044         kvm_inject_undefined(vcpu);
1045
1046         return false;
1047 }
1048
1049 /* Macro to expand the AMU counter and type registers*/
1050 #define AMU_AMEVCNTR0_EL0(n) { SYS_DESC(SYS_AMEVCNTR0_EL0(n)), undef_access }
1051 #define AMU_AMEVTYPER0_EL0(n) { SYS_DESC(SYS_AMEVTYPER0_EL0(n)), undef_access }
1052 #define AMU_AMEVCNTR1_EL0(n) { SYS_DESC(SYS_AMEVCNTR1_EL0(n)), undef_access }
1053 #define AMU_AMEVTYPER1_EL0(n) { SYS_DESC(SYS_AMEVTYPER1_EL0(n)), undef_access }
1054
1055 static unsigned int ptrauth_visibility(const struct kvm_vcpu *vcpu,
1056                         const struct sys_reg_desc *rd)
1057 {
1058         return vcpu_has_ptrauth(vcpu) ? 0 : REG_HIDDEN;
1059 }
1060
1061 /*
1062  * If we land here on a PtrAuth access, that is because we didn't
1063  * fixup the access on exit by allowing the PtrAuth sysregs. The only
1064  * way this happens is when the guest does not have PtrAuth support
1065  * enabled.
1066  */
1067 #define __PTRAUTH_KEY(k)                                                \
1068         { SYS_DESC(SYS_## k), undef_access, reset_unknown, k,           \
1069         .visibility = ptrauth_visibility}
1070
1071 #define PTRAUTH_KEY(k)                                                  \
1072         __PTRAUTH_KEY(k ## KEYLO_EL1),                                  \
1073         __PTRAUTH_KEY(k ## KEYHI_EL1)
1074
1075 static bool access_arch_timer(struct kvm_vcpu *vcpu,
1076                               struct sys_reg_params *p,
1077                               const struct sys_reg_desc *r)
1078 {
1079         enum kvm_arch_timers tmr;
1080         enum kvm_arch_timer_regs treg;
1081         u64 reg = reg_to_encoding(r);
1082
1083         switch (reg) {
1084         case SYS_CNTP_TVAL_EL0:
1085         case SYS_AARCH32_CNTP_TVAL:
1086                 tmr = TIMER_PTIMER;
1087                 treg = TIMER_REG_TVAL;
1088                 break;
1089         case SYS_CNTP_CTL_EL0:
1090         case SYS_AARCH32_CNTP_CTL:
1091                 tmr = TIMER_PTIMER;
1092                 treg = TIMER_REG_CTL;
1093                 break;
1094         case SYS_CNTP_CVAL_EL0:
1095         case SYS_AARCH32_CNTP_CVAL:
1096                 tmr = TIMER_PTIMER;
1097                 treg = TIMER_REG_CVAL;
1098                 break;
1099         default:
1100                 BUG();
1101         }
1102
1103         if (p->is_write)
1104                 kvm_arm_timer_write_sysreg(vcpu, tmr, treg, p->regval);
1105         else
1106                 p->regval = kvm_arm_timer_read_sysreg(vcpu, tmr, treg);
1107
1108         return true;
1109 }
1110
1111 /* Read a sanitised cpufeature ID register by sys_reg_desc */
1112 static u64 read_id_reg(const struct kvm_vcpu *vcpu,
1113                 struct sys_reg_desc const *r, bool raz)
1114 {
1115         u32 id = sys_reg((u32)r->Op0, (u32)r->Op1,
1116                          (u32)r->CRn, (u32)r->CRm, (u32)r->Op2);
1117         u64 val = raz ? 0 : read_sanitised_ftr_reg(id);
1118
1119         if (id == SYS_ID_AA64PFR0_EL1) {
1120                 if (!vcpu_has_sve(vcpu))
1121                         val &= ~(0xfUL << ID_AA64PFR0_SVE_SHIFT);
1122                 val &= ~(0xfUL << ID_AA64PFR0_AMU_SHIFT);
1123                 val &= ~(0xfUL << ID_AA64PFR0_CSV2_SHIFT);
1124                 val |= ((u64)vcpu->kvm->arch.pfr0_csv2 << ID_AA64PFR0_CSV2_SHIFT);
1125         } else if (id == SYS_ID_AA64PFR1_EL1) {
1126                 val &= ~(0xfUL << ID_AA64PFR1_MTE_SHIFT);
1127         } else if (id == SYS_ID_AA64ISAR1_EL1 && !vcpu_has_ptrauth(vcpu)) {
1128                 val &= ~((0xfUL << ID_AA64ISAR1_APA_SHIFT) |
1129                          (0xfUL << ID_AA64ISAR1_API_SHIFT) |
1130                          (0xfUL << ID_AA64ISAR1_GPA_SHIFT) |
1131                          (0xfUL << ID_AA64ISAR1_GPI_SHIFT));
1132         } else if (id == SYS_ID_AA64DFR0_EL1) {
1133                 /* Limit guests to PMUv3 for ARMv8.1 */
1134                 val = cpuid_feature_cap_perfmon_field(val,
1135                                                 ID_AA64DFR0_PMUVER_SHIFT,
1136                                                 ID_AA64DFR0_PMUVER_8_1);
1137         } else if (id == SYS_ID_DFR0_EL1) {
1138                 /* Limit guests to PMUv3 for ARMv8.1 */
1139                 val = cpuid_feature_cap_perfmon_field(val,
1140                                                 ID_DFR0_PERFMON_SHIFT,
1141                                                 ID_DFR0_PERFMON_8_1);
1142         }
1143
1144         return val;
1145 }
1146
1147 static unsigned int id_visibility(const struct kvm_vcpu *vcpu,
1148                                   const struct sys_reg_desc *r)
1149 {
1150         u32 id = sys_reg((u32)r->Op0, (u32)r->Op1,
1151                          (u32)r->CRn, (u32)r->CRm, (u32)r->Op2);
1152
1153         switch (id) {
1154         case SYS_ID_AA64ZFR0_EL1:
1155                 if (!vcpu_has_sve(vcpu))
1156                         return REG_RAZ;
1157                 break;
1158         }
1159
1160         return 0;
1161 }
1162
1163 /* cpufeature ID register access trap handlers */
1164
1165 static bool __access_id_reg(struct kvm_vcpu *vcpu,
1166                             struct sys_reg_params *p,
1167                             const struct sys_reg_desc *r,
1168                             bool raz)
1169 {
1170         if (p->is_write)
1171                 return write_to_read_only(vcpu, p, r);
1172
1173         p->regval = read_id_reg(vcpu, r, raz);
1174         return true;
1175 }
1176
1177 static bool access_id_reg(struct kvm_vcpu *vcpu,
1178                           struct sys_reg_params *p,
1179                           const struct sys_reg_desc *r)
1180 {
1181         bool raz = sysreg_visible_as_raz(vcpu, r);
1182
1183         return __access_id_reg(vcpu, p, r, raz);
1184 }
1185
1186 static bool access_raz_id_reg(struct kvm_vcpu *vcpu,
1187                               struct sys_reg_params *p,
1188                               const struct sys_reg_desc *r)
1189 {
1190         return __access_id_reg(vcpu, p, r, true);
1191 }
1192
1193 static int reg_from_user(u64 *val, const void __user *uaddr, u64 id);
1194 static int reg_to_user(void __user *uaddr, const u64 *val, u64 id);
1195 static u64 sys_reg_to_index(const struct sys_reg_desc *reg);
1196
1197 /* Visibility overrides for SVE-specific control registers */
1198 static unsigned int sve_visibility(const struct kvm_vcpu *vcpu,
1199                                    const struct sys_reg_desc *rd)
1200 {
1201         if (vcpu_has_sve(vcpu))
1202                 return 0;
1203
1204         return REG_HIDDEN;
1205 }
1206
1207 static int set_id_aa64pfr0_el1(struct kvm_vcpu *vcpu,
1208                                const struct sys_reg_desc *rd,
1209                                const struct kvm_one_reg *reg, void __user *uaddr)
1210 {
1211         const u64 id = sys_reg_to_index(rd);
1212         int err;
1213         u64 val;
1214         u8 csv2;
1215
1216         err = reg_from_user(&val, uaddr, id);
1217         if (err)
1218                 return err;
1219
1220         /*
1221          * Allow AA64PFR0_EL1.CSV2 to be set from userspace as long as
1222          * it doesn't promise more than what is actually provided (the
1223          * guest could otherwise be covered in ectoplasmic residue).
1224          */
1225         csv2 = cpuid_feature_extract_unsigned_field(val, ID_AA64PFR0_CSV2_SHIFT);
1226         if (csv2 > 1 ||
1227             (csv2 && arm64_get_spectre_v2_state() != SPECTRE_UNAFFECTED))
1228                 return -EINVAL;
1229
1230         /* We can only differ with CSV2, and anything else is an error */
1231         val ^= read_id_reg(vcpu, rd, false);
1232         val &= ~(0xFUL << ID_AA64PFR0_CSV2_SHIFT);
1233         if (val)
1234                 return -EINVAL;
1235
1236         vcpu->kvm->arch.pfr0_csv2 = csv2;
1237
1238         return 0;
1239 }
1240
1241 /*
1242  * cpufeature ID register user accessors
1243  *
1244  * For now, these registers are immutable for userspace, so no values
1245  * are stored, and for set_id_reg() we don't allow the effective value
1246  * to be changed.
1247  */
1248 static int __get_id_reg(const struct kvm_vcpu *vcpu,
1249                         const struct sys_reg_desc *rd, void __user *uaddr,
1250                         bool raz)
1251 {
1252         const u64 id = sys_reg_to_index(rd);
1253         const u64 val = read_id_reg(vcpu, rd, raz);
1254
1255         return reg_to_user(uaddr, &val, id);
1256 }
1257
1258 static int __set_id_reg(const struct kvm_vcpu *vcpu,
1259                         const struct sys_reg_desc *rd, void __user *uaddr,
1260                         bool raz)
1261 {
1262         const u64 id = sys_reg_to_index(rd);
1263         int err;
1264         u64 val;
1265
1266         err = reg_from_user(&val, uaddr, id);
1267         if (err)
1268                 return err;
1269
1270         /* This is what we mean by invariant: you can't change it. */
1271         if (val != read_id_reg(vcpu, rd, raz))
1272                 return -EINVAL;
1273
1274         return 0;
1275 }
1276
1277 static int get_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
1278                       const struct kvm_one_reg *reg, void __user *uaddr)
1279 {
1280         bool raz = sysreg_visible_as_raz(vcpu, rd);
1281
1282         return __get_id_reg(vcpu, rd, uaddr, raz);
1283 }
1284
1285 static int set_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
1286                       const struct kvm_one_reg *reg, void __user *uaddr)
1287 {
1288         bool raz = sysreg_visible_as_raz(vcpu, rd);
1289
1290         return __set_id_reg(vcpu, rd, uaddr, raz);
1291 }
1292
1293 static int get_raz_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
1294                           const struct kvm_one_reg *reg, void __user *uaddr)
1295 {
1296         return __get_id_reg(vcpu, rd, uaddr, true);
1297 }
1298
1299 static int set_raz_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
1300                           const struct kvm_one_reg *reg, void __user *uaddr)
1301 {
1302         return __set_id_reg(vcpu, rd, uaddr, true);
1303 }
1304
1305 static bool access_ctr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
1306                        const struct sys_reg_desc *r)
1307 {
1308         if (p->is_write)
1309                 return write_to_read_only(vcpu, p, r);
1310
1311         p->regval = read_sanitised_ftr_reg(SYS_CTR_EL0);
1312         return true;
1313 }
1314
1315 static bool access_clidr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
1316                          const struct sys_reg_desc *r)
1317 {
1318         if (p->is_write)
1319                 return write_to_read_only(vcpu, p, r);
1320
1321         p->regval = read_sysreg(clidr_el1);
1322         return true;
1323 }
1324
1325 static bool access_csselr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
1326                           const struct sys_reg_desc *r)
1327 {
1328         int reg = r->reg;
1329
1330         /* See the 32bit mapping in kvm_host.h */
1331         if (p->is_aarch32)
1332                 reg = r->reg / 2;
1333
1334         if (p->is_write)
1335                 vcpu_write_sys_reg(vcpu, p->regval, reg);
1336         else
1337                 p->regval = vcpu_read_sys_reg(vcpu, reg);
1338         return true;
1339 }
1340
1341 static bool access_ccsidr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
1342                           const struct sys_reg_desc *r)
1343 {
1344         u32 csselr;
1345
1346         if (p->is_write)
1347                 return write_to_read_only(vcpu, p, r);
1348
1349         csselr = vcpu_read_sys_reg(vcpu, CSSELR_EL1);
1350         p->regval = get_ccsidr(csselr);
1351
1352         /*
1353          * Guests should not be doing cache operations by set/way at all, and
1354          * for this reason, we trap them and attempt to infer the intent, so
1355          * that we can flush the entire guest's address space at the appropriate
1356          * time.
1357          * To prevent this trapping from causing performance problems, let's
1358          * expose the geometry of all data and unified caches (which are
1359          * guaranteed to be PIPT and thus non-aliasing) as 1 set and 1 way.
1360          * [If guests should attempt to infer aliasing properties from the
1361          * geometry (which is not permitted by the architecture), they would
1362          * only do so for virtually indexed caches.]
1363          */
1364         if (!(csselr & 1)) // data or unified cache
1365                 p->regval &= ~GENMASK(27, 3);
1366         return true;
1367 }
1368
1369 /* sys_reg_desc initialiser for known cpufeature ID registers */
1370 #define ID_SANITISED(name) {                    \
1371         SYS_DESC(SYS_##name),                   \
1372         .access = access_id_reg,                \
1373         .get_user = get_id_reg,                 \
1374         .set_user = set_id_reg,                 \
1375         .visibility = id_visibility,            \
1376 }
1377
1378 /*
1379  * sys_reg_desc initialiser for architecturally unallocated cpufeature ID
1380  * register with encoding Op0=3, Op1=0, CRn=0, CRm=crm, Op2=op2
1381  * (1 <= crm < 8, 0 <= Op2 < 8).
1382  */
1383 #define ID_UNALLOCATED(crm, op2) {                      \
1384         Op0(3), Op1(0), CRn(0), CRm(crm), Op2(op2),     \
1385         .access = access_raz_id_reg,                    \
1386         .get_user = get_raz_id_reg,                     \
1387         .set_user = set_raz_id_reg,                     \
1388 }
1389
1390 /*
1391  * sys_reg_desc initialiser for known ID registers that we hide from guests.
1392  * For now, these are exposed just like unallocated ID regs: they appear
1393  * RAZ for the guest.
1394  */
1395 #define ID_HIDDEN(name) {                       \
1396         SYS_DESC(SYS_##name),                   \
1397         .access = access_raz_id_reg,            \
1398         .get_user = get_raz_id_reg,             \
1399         .set_user = set_raz_id_reg,             \
1400 }
1401
1402 /*
1403  * Architected system registers.
1404  * Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2
1405  *
1406  * Debug handling: We do trap most, if not all debug related system
1407  * registers. The implementation is good enough to ensure that a guest
1408  * can use these with minimal performance degradation. The drawback is
1409  * that we don't implement any of the external debug, none of the
1410  * OSlock protocol. This should be revisited if we ever encounter a
1411  * more demanding guest...
1412  */
1413 static const struct sys_reg_desc sys_reg_descs[] = {
1414         { SYS_DESC(SYS_DC_ISW), access_dcsw },
1415         { SYS_DESC(SYS_DC_CSW), access_dcsw },
1416         { SYS_DESC(SYS_DC_CISW), access_dcsw },
1417
1418         DBG_BCR_BVR_WCR_WVR_EL1(0),
1419         DBG_BCR_BVR_WCR_WVR_EL1(1),
1420         { SYS_DESC(SYS_MDCCINT_EL1), trap_debug_regs, reset_val, MDCCINT_EL1, 0 },
1421         { SYS_DESC(SYS_MDSCR_EL1), trap_debug_regs, reset_val, MDSCR_EL1, 0 },
1422         DBG_BCR_BVR_WCR_WVR_EL1(2),
1423         DBG_BCR_BVR_WCR_WVR_EL1(3),
1424         DBG_BCR_BVR_WCR_WVR_EL1(4),
1425         DBG_BCR_BVR_WCR_WVR_EL1(5),
1426         DBG_BCR_BVR_WCR_WVR_EL1(6),
1427         DBG_BCR_BVR_WCR_WVR_EL1(7),
1428         DBG_BCR_BVR_WCR_WVR_EL1(8),
1429         DBG_BCR_BVR_WCR_WVR_EL1(9),
1430         DBG_BCR_BVR_WCR_WVR_EL1(10),
1431         DBG_BCR_BVR_WCR_WVR_EL1(11),
1432         DBG_BCR_BVR_WCR_WVR_EL1(12),
1433         DBG_BCR_BVR_WCR_WVR_EL1(13),
1434         DBG_BCR_BVR_WCR_WVR_EL1(14),
1435         DBG_BCR_BVR_WCR_WVR_EL1(15),
1436
1437         { SYS_DESC(SYS_MDRAR_EL1), trap_raz_wi },
1438         { SYS_DESC(SYS_OSLAR_EL1), trap_raz_wi },
1439         { SYS_DESC(SYS_OSLSR_EL1), trap_oslsr_el1 },
1440         { SYS_DESC(SYS_OSDLR_EL1), trap_raz_wi },
1441         { SYS_DESC(SYS_DBGPRCR_EL1), trap_raz_wi },
1442         { SYS_DESC(SYS_DBGCLAIMSET_EL1), trap_raz_wi },
1443         { SYS_DESC(SYS_DBGCLAIMCLR_EL1), trap_raz_wi },
1444         { SYS_DESC(SYS_DBGAUTHSTATUS_EL1), trap_dbgauthstatus_el1 },
1445
1446         { SYS_DESC(SYS_MDCCSR_EL0), trap_raz_wi },
1447         { SYS_DESC(SYS_DBGDTR_EL0), trap_raz_wi },
1448         // DBGDTR[TR]X_EL0 share the same encoding
1449         { SYS_DESC(SYS_DBGDTRTX_EL0), trap_raz_wi },
1450
1451         { SYS_DESC(SYS_DBGVCR32_EL2), NULL, reset_val, DBGVCR32_EL2, 0 },
1452
1453         { SYS_DESC(SYS_MPIDR_EL1), NULL, reset_mpidr, MPIDR_EL1 },
1454
1455         /*
1456          * ID regs: all ID_SANITISED() entries here must have corresponding
1457          * entries in arm64_ftr_regs[].
1458          */
1459
1460         /* AArch64 mappings of the AArch32 ID registers */
1461         /* CRm=1 */
1462         ID_SANITISED(ID_PFR0_EL1),
1463         ID_SANITISED(ID_PFR1_EL1),
1464         ID_SANITISED(ID_DFR0_EL1),
1465         ID_HIDDEN(ID_AFR0_EL1),
1466         ID_SANITISED(ID_MMFR0_EL1),
1467         ID_SANITISED(ID_MMFR1_EL1),
1468         ID_SANITISED(ID_MMFR2_EL1),
1469         ID_SANITISED(ID_MMFR3_EL1),
1470
1471         /* CRm=2 */
1472         ID_SANITISED(ID_ISAR0_EL1),
1473         ID_SANITISED(ID_ISAR1_EL1),
1474         ID_SANITISED(ID_ISAR2_EL1),
1475         ID_SANITISED(ID_ISAR3_EL1),
1476         ID_SANITISED(ID_ISAR4_EL1),
1477         ID_SANITISED(ID_ISAR5_EL1),
1478         ID_SANITISED(ID_MMFR4_EL1),
1479         ID_SANITISED(ID_ISAR6_EL1),
1480
1481         /* CRm=3 */
1482         ID_SANITISED(MVFR0_EL1),
1483         ID_SANITISED(MVFR1_EL1),
1484         ID_SANITISED(MVFR2_EL1),
1485         ID_UNALLOCATED(3,3),
1486         ID_SANITISED(ID_PFR2_EL1),
1487         ID_HIDDEN(ID_DFR1_EL1),
1488         ID_SANITISED(ID_MMFR5_EL1),
1489         ID_UNALLOCATED(3,7),
1490
1491         /* AArch64 ID registers */
1492         /* CRm=4 */
1493         { SYS_DESC(SYS_ID_AA64PFR0_EL1), .access = access_id_reg,
1494           .get_user = get_id_reg, .set_user = set_id_aa64pfr0_el1, },
1495         ID_SANITISED(ID_AA64PFR1_EL1),
1496         ID_UNALLOCATED(4,2),
1497         ID_UNALLOCATED(4,3),
1498         ID_SANITISED(ID_AA64ZFR0_EL1),
1499         ID_UNALLOCATED(4,5),
1500         ID_UNALLOCATED(4,6),
1501         ID_UNALLOCATED(4,7),
1502
1503         /* CRm=5 */
1504         ID_SANITISED(ID_AA64DFR0_EL1),
1505         ID_SANITISED(ID_AA64DFR1_EL1),
1506         ID_UNALLOCATED(5,2),
1507         ID_UNALLOCATED(5,3),
1508         ID_HIDDEN(ID_AA64AFR0_EL1),
1509         ID_HIDDEN(ID_AA64AFR1_EL1),
1510         ID_UNALLOCATED(5,6),
1511         ID_UNALLOCATED(5,7),
1512
1513         /* CRm=6 */
1514         ID_SANITISED(ID_AA64ISAR0_EL1),
1515         ID_SANITISED(ID_AA64ISAR1_EL1),
1516         ID_UNALLOCATED(6,2),
1517         ID_UNALLOCATED(6,3),
1518         ID_UNALLOCATED(6,4),
1519         ID_UNALLOCATED(6,5),
1520         ID_UNALLOCATED(6,6),
1521         ID_UNALLOCATED(6,7),
1522
1523         /* CRm=7 */
1524         ID_SANITISED(ID_AA64MMFR0_EL1),
1525         ID_SANITISED(ID_AA64MMFR1_EL1),
1526         ID_SANITISED(ID_AA64MMFR2_EL1),
1527         ID_UNALLOCATED(7,3),
1528         ID_UNALLOCATED(7,4),
1529         ID_UNALLOCATED(7,5),
1530         ID_UNALLOCATED(7,6),
1531         ID_UNALLOCATED(7,7),
1532
1533         { SYS_DESC(SYS_SCTLR_EL1), access_vm_reg, reset_val, SCTLR_EL1, 0x00C50078 },
1534         { SYS_DESC(SYS_ACTLR_EL1), access_actlr, reset_actlr, ACTLR_EL1 },
1535         { SYS_DESC(SYS_CPACR_EL1), NULL, reset_val, CPACR_EL1, 0 },
1536
1537         { SYS_DESC(SYS_RGSR_EL1), undef_access },
1538         { SYS_DESC(SYS_GCR_EL1), undef_access },
1539
1540         { SYS_DESC(SYS_ZCR_EL1), NULL, reset_val, ZCR_EL1, 0, .visibility = sve_visibility },
1541         { SYS_DESC(SYS_TTBR0_EL1), access_vm_reg, reset_unknown, TTBR0_EL1 },
1542         { SYS_DESC(SYS_TTBR1_EL1), access_vm_reg, reset_unknown, TTBR1_EL1 },
1543         { SYS_DESC(SYS_TCR_EL1), access_vm_reg, reset_val, TCR_EL1, 0 },
1544
1545         PTRAUTH_KEY(APIA),
1546         PTRAUTH_KEY(APIB),
1547         PTRAUTH_KEY(APDA),
1548         PTRAUTH_KEY(APDB),
1549         PTRAUTH_KEY(APGA),
1550
1551         { SYS_DESC(SYS_AFSR0_EL1), access_vm_reg, reset_unknown, AFSR0_EL1 },
1552         { SYS_DESC(SYS_AFSR1_EL1), access_vm_reg, reset_unknown, AFSR1_EL1 },
1553         { SYS_DESC(SYS_ESR_EL1), access_vm_reg, reset_unknown, ESR_EL1 },
1554
1555         { SYS_DESC(SYS_ERRIDR_EL1), trap_raz_wi },
1556         { SYS_DESC(SYS_ERRSELR_EL1), trap_raz_wi },
1557         { SYS_DESC(SYS_ERXFR_EL1), trap_raz_wi },
1558         { SYS_DESC(SYS_ERXCTLR_EL1), trap_raz_wi },
1559         { SYS_DESC(SYS_ERXSTATUS_EL1), trap_raz_wi },
1560         { SYS_DESC(SYS_ERXADDR_EL1), trap_raz_wi },
1561         { SYS_DESC(SYS_ERXMISC0_EL1), trap_raz_wi },
1562         { SYS_DESC(SYS_ERXMISC1_EL1), trap_raz_wi },
1563
1564         { SYS_DESC(SYS_TFSR_EL1), undef_access },
1565         { SYS_DESC(SYS_TFSRE0_EL1), undef_access },
1566
1567         { SYS_DESC(SYS_FAR_EL1), access_vm_reg, reset_unknown, FAR_EL1 },
1568         { SYS_DESC(SYS_PAR_EL1), NULL, reset_unknown, PAR_EL1 },
1569
1570         { SYS_DESC(SYS_PMINTENSET_EL1), access_pminten, reset_unknown, PMINTENSET_EL1 },
1571         { SYS_DESC(SYS_PMINTENCLR_EL1), access_pminten, reset_unknown, PMINTENSET_EL1 },
1572
1573         { SYS_DESC(SYS_MAIR_EL1), access_vm_reg, reset_unknown, MAIR_EL1 },
1574         { SYS_DESC(SYS_AMAIR_EL1), access_vm_reg, reset_amair_el1, AMAIR_EL1 },
1575
1576         { SYS_DESC(SYS_LORSA_EL1), trap_loregion },
1577         { SYS_DESC(SYS_LOREA_EL1), trap_loregion },
1578         { SYS_DESC(SYS_LORN_EL1), trap_loregion },
1579         { SYS_DESC(SYS_LORC_EL1), trap_loregion },
1580         { SYS_DESC(SYS_LORID_EL1), trap_loregion },
1581
1582         { SYS_DESC(SYS_VBAR_EL1), NULL, reset_val, VBAR_EL1, 0 },
1583         { SYS_DESC(SYS_DISR_EL1), NULL, reset_val, DISR_EL1, 0 },
1584
1585         { SYS_DESC(SYS_ICC_IAR0_EL1), write_to_read_only },
1586         { SYS_DESC(SYS_ICC_EOIR0_EL1), read_from_write_only },
1587         { SYS_DESC(SYS_ICC_HPPIR0_EL1), write_to_read_only },
1588         { SYS_DESC(SYS_ICC_DIR_EL1), read_from_write_only },
1589         { SYS_DESC(SYS_ICC_RPR_EL1), write_to_read_only },
1590         { SYS_DESC(SYS_ICC_SGI1R_EL1), access_gic_sgi },
1591         { SYS_DESC(SYS_ICC_ASGI1R_EL1), access_gic_sgi },
1592         { SYS_DESC(SYS_ICC_SGI0R_EL1), access_gic_sgi },
1593         { SYS_DESC(SYS_ICC_IAR1_EL1), write_to_read_only },
1594         { SYS_DESC(SYS_ICC_EOIR1_EL1), read_from_write_only },
1595         { SYS_DESC(SYS_ICC_HPPIR1_EL1), write_to_read_only },
1596         { SYS_DESC(SYS_ICC_SRE_EL1), access_gic_sre },
1597
1598         { SYS_DESC(SYS_CONTEXTIDR_EL1), access_vm_reg, reset_val, CONTEXTIDR_EL1, 0 },
1599         { SYS_DESC(SYS_TPIDR_EL1), NULL, reset_unknown, TPIDR_EL1 },
1600
1601         { SYS_DESC(SYS_SCXTNUM_EL1), undef_access },
1602
1603         { SYS_DESC(SYS_CNTKCTL_EL1), NULL, reset_val, CNTKCTL_EL1, 0},
1604
1605         { SYS_DESC(SYS_CCSIDR_EL1), access_ccsidr },
1606         { SYS_DESC(SYS_CLIDR_EL1), access_clidr },
1607         { SYS_DESC(SYS_CSSELR_EL1), access_csselr, reset_unknown, CSSELR_EL1 },
1608         { SYS_DESC(SYS_CTR_EL0), access_ctr },
1609
1610         { SYS_DESC(SYS_PMCR_EL0), access_pmcr, reset_pmcr, PMCR_EL0 },
1611         { SYS_DESC(SYS_PMCNTENSET_EL0), access_pmcnten, reset_unknown, PMCNTENSET_EL0 },
1612         { SYS_DESC(SYS_PMCNTENCLR_EL0), access_pmcnten, reset_unknown, PMCNTENSET_EL0 },
1613         { SYS_DESC(SYS_PMOVSCLR_EL0), access_pmovs, reset_unknown, PMOVSSET_EL0 },
1614         { SYS_DESC(SYS_PMSWINC_EL0), access_pmswinc, reset_unknown, PMSWINC_EL0 },
1615         { SYS_DESC(SYS_PMSELR_EL0), access_pmselr, reset_unknown, PMSELR_EL0 },
1616         { SYS_DESC(SYS_PMCEID0_EL0), access_pmceid },
1617         { SYS_DESC(SYS_PMCEID1_EL0), access_pmceid },
1618         { SYS_DESC(SYS_PMCCNTR_EL0), access_pmu_evcntr, reset_unknown, PMCCNTR_EL0 },
1619         { SYS_DESC(SYS_PMXEVTYPER_EL0), access_pmu_evtyper },
1620         { SYS_DESC(SYS_PMXEVCNTR_EL0), access_pmu_evcntr },
1621         /*
1622          * PMUSERENR_EL0 resets as unknown in 64bit mode while it resets as zero
1623          * in 32bit mode. Here we choose to reset it as zero for consistency.
1624          */
1625         { SYS_DESC(SYS_PMUSERENR_EL0), access_pmuserenr, reset_val, PMUSERENR_EL0, 0 },
1626         { SYS_DESC(SYS_PMOVSSET_EL0), access_pmovs, reset_unknown, PMOVSSET_EL0 },
1627
1628         { SYS_DESC(SYS_TPIDR_EL0), NULL, reset_unknown, TPIDR_EL0 },
1629         { SYS_DESC(SYS_TPIDRRO_EL0), NULL, reset_unknown, TPIDRRO_EL0 },
1630
1631         { SYS_DESC(SYS_SCXTNUM_EL0), undef_access },
1632
1633         { SYS_DESC(SYS_AMCR_EL0), undef_access },
1634         { SYS_DESC(SYS_AMCFGR_EL0), undef_access },
1635         { SYS_DESC(SYS_AMCGCR_EL0), undef_access },
1636         { SYS_DESC(SYS_AMUSERENR_EL0), undef_access },
1637         { SYS_DESC(SYS_AMCNTENCLR0_EL0), undef_access },
1638         { SYS_DESC(SYS_AMCNTENSET0_EL0), undef_access },
1639         { SYS_DESC(SYS_AMCNTENCLR1_EL0), undef_access },
1640         { SYS_DESC(SYS_AMCNTENSET1_EL0), undef_access },
1641         AMU_AMEVCNTR0_EL0(0),
1642         AMU_AMEVCNTR0_EL0(1),
1643         AMU_AMEVCNTR0_EL0(2),
1644         AMU_AMEVCNTR0_EL0(3),
1645         AMU_AMEVCNTR0_EL0(4),
1646         AMU_AMEVCNTR0_EL0(5),
1647         AMU_AMEVCNTR0_EL0(6),
1648         AMU_AMEVCNTR0_EL0(7),
1649         AMU_AMEVCNTR0_EL0(8),
1650         AMU_AMEVCNTR0_EL0(9),
1651         AMU_AMEVCNTR0_EL0(10),
1652         AMU_AMEVCNTR0_EL0(11),
1653         AMU_AMEVCNTR0_EL0(12),
1654         AMU_AMEVCNTR0_EL0(13),
1655         AMU_AMEVCNTR0_EL0(14),
1656         AMU_AMEVCNTR0_EL0(15),
1657         AMU_AMEVTYPER0_EL0(0),
1658         AMU_AMEVTYPER0_EL0(1),
1659         AMU_AMEVTYPER0_EL0(2),
1660         AMU_AMEVTYPER0_EL0(3),
1661         AMU_AMEVTYPER0_EL0(4),
1662         AMU_AMEVTYPER0_EL0(5),
1663         AMU_AMEVTYPER0_EL0(6),
1664         AMU_AMEVTYPER0_EL0(7),
1665         AMU_AMEVTYPER0_EL0(8),
1666         AMU_AMEVTYPER0_EL0(9),
1667         AMU_AMEVTYPER0_EL0(10),
1668         AMU_AMEVTYPER0_EL0(11),
1669         AMU_AMEVTYPER0_EL0(12),
1670         AMU_AMEVTYPER0_EL0(13),
1671         AMU_AMEVTYPER0_EL0(14),
1672         AMU_AMEVTYPER0_EL0(15),
1673         AMU_AMEVCNTR1_EL0(0),
1674         AMU_AMEVCNTR1_EL0(1),
1675         AMU_AMEVCNTR1_EL0(2),
1676         AMU_AMEVCNTR1_EL0(3),
1677         AMU_AMEVCNTR1_EL0(4),
1678         AMU_AMEVCNTR1_EL0(5),
1679         AMU_AMEVCNTR1_EL0(6),
1680         AMU_AMEVCNTR1_EL0(7),
1681         AMU_AMEVCNTR1_EL0(8),
1682         AMU_AMEVCNTR1_EL0(9),
1683         AMU_AMEVCNTR1_EL0(10),
1684         AMU_AMEVCNTR1_EL0(11),
1685         AMU_AMEVCNTR1_EL0(12),
1686         AMU_AMEVCNTR1_EL0(13),
1687         AMU_AMEVCNTR1_EL0(14),
1688         AMU_AMEVCNTR1_EL0(15),
1689         AMU_AMEVTYPER1_EL0(0),
1690         AMU_AMEVTYPER1_EL0(1),
1691         AMU_AMEVTYPER1_EL0(2),
1692         AMU_AMEVTYPER1_EL0(3),
1693         AMU_AMEVTYPER1_EL0(4),
1694         AMU_AMEVTYPER1_EL0(5),
1695         AMU_AMEVTYPER1_EL0(6),
1696         AMU_AMEVTYPER1_EL0(7),
1697         AMU_AMEVTYPER1_EL0(8),
1698         AMU_AMEVTYPER1_EL0(9),
1699         AMU_AMEVTYPER1_EL0(10),
1700         AMU_AMEVTYPER1_EL0(11),
1701         AMU_AMEVTYPER1_EL0(12),
1702         AMU_AMEVTYPER1_EL0(13),
1703         AMU_AMEVTYPER1_EL0(14),
1704         AMU_AMEVTYPER1_EL0(15),
1705
1706         { SYS_DESC(SYS_CNTP_TVAL_EL0), access_arch_timer },
1707         { SYS_DESC(SYS_CNTP_CTL_EL0), access_arch_timer },
1708         { SYS_DESC(SYS_CNTP_CVAL_EL0), access_arch_timer },
1709
1710         /* PMEVCNTRn_EL0 */
1711         PMU_PMEVCNTR_EL0(0),
1712         PMU_PMEVCNTR_EL0(1),
1713         PMU_PMEVCNTR_EL0(2),
1714         PMU_PMEVCNTR_EL0(3),
1715         PMU_PMEVCNTR_EL0(4),
1716         PMU_PMEVCNTR_EL0(5),
1717         PMU_PMEVCNTR_EL0(6),
1718         PMU_PMEVCNTR_EL0(7),
1719         PMU_PMEVCNTR_EL0(8),
1720         PMU_PMEVCNTR_EL0(9),
1721         PMU_PMEVCNTR_EL0(10),
1722         PMU_PMEVCNTR_EL0(11),
1723         PMU_PMEVCNTR_EL0(12),
1724         PMU_PMEVCNTR_EL0(13),
1725         PMU_PMEVCNTR_EL0(14),
1726         PMU_PMEVCNTR_EL0(15),
1727         PMU_PMEVCNTR_EL0(16),
1728         PMU_PMEVCNTR_EL0(17),
1729         PMU_PMEVCNTR_EL0(18),
1730         PMU_PMEVCNTR_EL0(19),
1731         PMU_PMEVCNTR_EL0(20),
1732         PMU_PMEVCNTR_EL0(21),
1733         PMU_PMEVCNTR_EL0(22),
1734         PMU_PMEVCNTR_EL0(23),
1735         PMU_PMEVCNTR_EL0(24),
1736         PMU_PMEVCNTR_EL0(25),
1737         PMU_PMEVCNTR_EL0(26),
1738         PMU_PMEVCNTR_EL0(27),
1739         PMU_PMEVCNTR_EL0(28),
1740         PMU_PMEVCNTR_EL0(29),
1741         PMU_PMEVCNTR_EL0(30),
1742         /* PMEVTYPERn_EL0 */
1743         PMU_PMEVTYPER_EL0(0),
1744         PMU_PMEVTYPER_EL0(1),
1745         PMU_PMEVTYPER_EL0(2),
1746         PMU_PMEVTYPER_EL0(3),
1747         PMU_PMEVTYPER_EL0(4),
1748         PMU_PMEVTYPER_EL0(5),
1749         PMU_PMEVTYPER_EL0(6),
1750         PMU_PMEVTYPER_EL0(7),
1751         PMU_PMEVTYPER_EL0(8),
1752         PMU_PMEVTYPER_EL0(9),
1753         PMU_PMEVTYPER_EL0(10),
1754         PMU_PMEVTYPER_EL0(11),
1755         PMU_PMEVTYPER_EL0(12),
1756         PMU_PMEVTYPER_EL0(13),
1757         PMU_PMEVTYPER_EL0(14),
1758         PMU_PMEVTYPER_EL0(15),
1759         PMU_PMEVTYPER_EL0(16),
1760         PMU_PMEVTYPER_EL0(17),
1761         PMU_PMEVTYPER_EL0(18),
1762         PMU_PMEVTYPER_EL0(19),
1763         PMU_PMEVTYPER_EL0(20),
1764         PMU_PMEVTYPER_EL0(21),
1765         PMU_PMEVTYPER_EL0(22),
1766         PMU_PMEVTYPER_EL0(23),
1767         PMU_PMEVTYPER_EL0(24),
1768         PMU_PMEVTYPER_EL0(25),
1769         PMU_PMEVTYPER_EL0(26),
1770         PMU_PMEVTYPER_EL0(27),
1771         PMU_PMEVTYPER_EL0(28),
1772         PMU_PMEVTYPER_EL0(29),
1773         PMU_PMEVTYPER_EL0(30),
1774         /*
1775          * PMCCFILTR_EL0 resets as unknown in 64bit mode while it resets as zero
1776          * in 32bit mode. Here we choose to reset it as zero for consistency.
1777          */
1778         { SYS_DESC(SYS_PMCCFILTR_EL0), access_pmu_evtyper, reset_val, PMCCFILTR_EL0, 0 },
1779
1780         { SYS_DESC(SYS_DACR32_EL2), NULL, reset_unknown, DACR32_EL2 },
1781         { SYS_DESC(SYS_IFSR32_EL2), NULL, reset_unknown, IFSR32_EL2 },
1782         { SYS_DESC(SYS_FPEXC32_EL2), NULL, reset_val, FPEXC32_EL2, 0x700 },
1783 };
1784
1785 static bool trap_dbgidr(struct kvm_vcpu *vcpu,
1786                         struct sys_reg_params *p,
1787                         const struct sys_reg_desc *r)
1788 {
1789         if (p->is_write) {
1790                 return ignore_write(vcpu, p);
1791         } else {
1792                 u64 dfr = read_sanitised_ftr_reg(SYS_ID_AA64DFR0_EL1);
1793                 u64 pfr = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1);
1794                 u32 el3 = !!cpuid_feature_extract_unsigned_field(pfr, ID_AA64PFR0_EL3_SHIFT);
1795
1796                 p->regval = ((((dfr >> ID_AA64DFR0_WRPS_SHIFT) & 0xf) << 28) |
1797                              (((dfr >> ID_AA64DFR0_BRPS_SHIFT) & 0xf) << 24) |
1798                              (((dfr >> ID_AA64DFR0_CTX_CMPS_SHIFT) & 0xf) << 20)
1799                              | (6 << 16) | (el3 << 14) | (el3 << 12));
1800                 return true;
1801         }
1802 }
1803
1804 static bool trap_debug32(struct kvm_vcpu *vcpu,
1805                          struct sys_reg_params *p,
1806                          const struct sys_reg_desc *r)
1807 {
1808         if (p->is_write) {
1809                 vcpu_cp14(vcpu, r->reg) = p->regval;
1810                 vcpu->arch.flags |= KVM_ARM64_DEBUG_DIRTY;
1811         } else {
1812                 p->regval = vcpu_cp14(vcpu, r->reg);
1813         }
1814
1815         return true;
1816 }
1817
1818 /* AArch32 debug register mappings
1819  *
1820  * AArch32 DBGBVRn is mapped to DBGBVRn_EL1[31:0]
1821  * AArch32 DBGBXVRn is mapped to DBGBVRn_EL1[63:32]
1822  *
1823  * All control registers and watchpoint value registers are mapped to
1824  * the lower 32 bits of their AArch64 equivalents. We share the trap
1825  * handlers with the above AArch64 code which checks what mode the
1826  * system is in.
1827  */
1828
1829 static bool trap_xvr(struct kvm_vcpu *vcpu,
1830                      struct sys_reg_params *p,
1831                      const struct sys_reg_desc *rd)
1832 {
1833         u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg];
1834
1835         if (p->is_write) {
1836                 u64 val = *dbg_reg;
1837
1838                 val &= 0xffffffffUL;
1839                 val |= p->regval << 32;
1840                 *dbg_reg = val;
1841
1842                 vcpu->arch.flags |= KVM_ARM64_DEBUG_DIRTY;
1843         } else {
1844                 p->regval = *dbg_reg >> 32;
1845         }
1846
1847         trace_trap_reg(__func__, rd->reg, p->is_write, *dbg_reg);
1848
1849         return true;
1850 }
1851
1852 #define DBG_BCR_BVR_WCR_WVR(n)                                          \
1853         /* DBGBVRn */                                                   \
1854         { Op1( 0), CRn( 0), CRm((n)), Op2( 4), trap_bvr, NULL, n },     \
1855         /* DBGBCRn */                                                   \
1856         { Op1( 0), CRn( 0), CRm((n)), Op2( 5), trap_bcr, NULL, n },     \
1857         /* DBGWVRn */                                                   \
1858         { Op1( 0), CRn( 0), CRm((n)), Op2( 6), trap_wvr, NULL, n },     \
1859         /* DBGWCRn */                                                   \
1860         { Op1( 0), CRn( 0), CRm((n)), Op2( 7), trap_wcr, NULL, n }
1861
1862 #define DBGBXVR(n)                                                      \
1863         { Op1( 0), CRn( 1), CRm((n)), Op2( 1), trap_xvr, NULL, n }
1864
1865 /*
1866  * Trapped cp14 registers. We generally ignore most of the external
1867  * debug, on the principle that they don't really make sense to a
1868  * guest. Revisit this one day, would this principle change.
1869  */
1870 static const struct sys_reg_desc cp14_regs[] = {
1871         /* DBGIDR */
1872         { Op1( 0), CRn( 0), CRm( 0), Op2( 0), trap_dbgidr },
1873         /* DBGDTRRXext */
1874         { Op1( 0), CRn( 0), CRm( 0), Op2( 2), trap_raz_wi },
1875
1876         DBG_BCR_BVR_WCR_WVR(0),
1877         /* DBGDSCRint */
1878         { Op1( 0), CRn( 0), CRm( 1), Op2( 0), trap_raz_wi },
1879         DBG_BCR_BVR_WCR_WVR(1),
1880         /* DBGDCCINT */
1881         { Op1( 0), CRn( 0), CRm( 2), Op2( 0), trap_debug32, NULL, cp14_DBGDCCINT },
1882         /* DBGDSCRext */
1883         { Op1( 0), CRn( 0), CRm( 2), Op2( 2), trap_debug32, NULL, cp14_DBGDSCRext },
1884         DBG_BCR_BVR_WCR_WVR(2),
1885         /* DBGDTR[RT]Xint */
1886         { Op1( 0), CRn( 0), CRm( 3), Op2( 0), trap_raz_wi },
1887         /* DBGDTR[RT]Xext */
1888         { Op1( 0), CRn( 0), CRm( 3), Op2( 2), trap_raz_wi },
1889         DBG_BCR_BVR_WCR_WVR(3),
1890         DBG_BCR_BVR_WCR_WVR(4),
1891         DBG_BCR_BVR_WCR_WVR(5),
1892         /* DBGWFAR */
1893         { Op1( 0), CRn( 0), CRm( 6), Op2( 0), trap_raz_wi },
1894         /* DBGOSECCR */
1895         { Op1( 0), CRn( 0), CRm( 6), Op2( 2), trap_raz_wi },
1896         DBG_BCR_BVR_WCR_WVR(6),
1897         /* DBGVCR */
1898         { Op1( 0), CRn( 0), CRm( 7), Op2( 0), trap_debug32, NULL, cp14_DBGVCR },
1899         DBG_BCR_BVR_WCR_WVR(7),
1900         DBG_BCR_BVR_WCR_WVR(8),
1901         DBG_BCR_BVR_WCR_WVR(9),
1902         DBG_BCR_BVR_WCR_WVR(10),
1903         DBG_BCR_BVR_WCR_WVR(11),
1904         DBG_BCR_BVR_WCR_WVR(12),
1905         DBG_BCR_BVR_WCR_WVR(13),
1906         DBG_BCR_BVR_WCR_WVR(14),
1907         DBG_BCR_BVR_WCR_WVR(15),
1908
1909         /* DBGDRAR (32bit) */
1910         { Op1( 0), CRn( 1), CRm( 0), Op2( 0), trap_raz_wi },
1911
1912         DBGBXVR(0),
1913         /* DBGOSLAR */
1914         { Op1( 0), CRn( 1), CRm( 0), Op2( 4), trap_raz_wi },
1915         DBGBXVR(1),
1916         /* DBGOSLSR */
1917         { Op1( 0), CRn( 1), CRm( 1), Op2( 4), trap_oslsr_el1 },
1918         DBGBXVR(2),
1919         DBGBXVR(3),
1920         /* DBGOSDLR */
1921         { Op1( 0), CRn( 1), CRm( 3), Op2( 4), trap_raz_wi },
1922         DBGBXVR(4),
1923         /* DBGPRCR */
1924         { Op1( 0), CRn( 1), CRm( 4), Op2( 4), trap_raz_wi },
1925         DBGBXVR(5),
1926         DBGBXVR(6),
1927         DBGBXVR(7),
1928         DBGBXVR(8),
1929         DBGBXVR(9),
1930         DBGBXVR(10),
1931         DBGBXVR(11),
1932         DBGBXVR(12),
1933         DBGBXVR(13),
1934         DBGBXVR(14),
1935         DBGBXVR(15),
1936
1937         /* DBGDSAR (32bit) */
1938         { Op1( 0), CRn( 2), CRm( 0), Op2( 0), trap_raz_wi },
1939
1940         /* DBGDEVID2 */
1941         { Op1( 0), CRn( 7), CRm( 0), Op2( 7), trap_raz_wi },
1942         /* DBGDEVID1 */
1943         { Op1( 0), CRn( 7), CRm( 1), Op2( 7), trap_raz_wi },
1944         /* DBGDEVID */
1945         { Op1( 0), CRn( 7), CRm( 2), Op2( 7), trap_raz_wi },
1946         /* DBGCLAIMSET */
1947         { Op1( 0), CRn( 7), CRm( 8), Op2( 6), trap_raz_wi },
1948         /* DBGCLAIMCLR */
1949         { Op1( 0), CRn( 7), CRm( 9), Op2( 6), trap_raz_wi },
1950         /* DBGAUTHSTATUS */
1951         { Op1( 0), CRn( 7), CRm(14), Op2( 6), trap_dbgauthstatus_el1 },
1952 };
1953
1954 /* Trapped cp14 64bit registers */
1955 static const struct sys_reg_desc cp14_64_regs[] = {
1956         /* DBGDRAR (64bit) */
1957         { Op1( 0), CRm( 1), .access = trap_raz_wi },
1958
1959         /* DBGDSAR (64bit) */
1960         { Op1( 0), CRm( 2), .access = trap_raz_wi },
1961 };
1962
1963 /* Macro to expand the PMEVCNTRn register */
1964 #define PMU_PMEVCNTR(n)                                                 \
1965         /* PMEVCNTRn */                                                 \
1966         { Op1(0), CRn(0b1110),                                          \
1967           CRm((0b1000 | (((n) >> 3) & 0x3))), Op2(((n) & 0x7)),         \
1968           access_pmu_evcntr }
1969
1970 /* Macro to expand the PMEVTYPERn register */
1971 #define PMU_PMEVTYPER(n)                                                \
1972         /* PMEVTYPERn */                                                \
1973         { Op1(0), CRn(0b1110),                                          \
1974           CRm((0b1100 | (((n) >> 3) & 0x3))), Op2(((n) & 0x7)),         \
1975           access_pmu_evtyper }
1976
1977 /*
1978  * Trapped cp15 registers. TTBR0/TTBR1 get a double encoding,
1979  * depending on the way they are accessed (as a 32bit or a 64bit
1980  * register).
1981  */
1982 static const struct sys_reg_desc cp15_regs[] = {
1983         { Op1( 0), CRn( 0), CRm( 0), Op2( 1), access_ctr },
1984         { Op1( 0), CRn( 1), CRm( 0), Op2( 0), access_vm_reg, NULL, c1_SCTLR },
1985         { Op1( 0), CRn( 1), CRm( 0), Op2( 1), access_actlr },
1986         { Op1( 0), CRn( 1), CRm( 0), Op2( 3), access_actlr },
1987         { Op1( 0), CRn( 2), CRm( 0), Op2( 0), access_vm_reg, NULL, c2_TTBR0 },
1988         { Op1( 0), CRn( 2), CRm( 0), Op2( 1), access_vm_reg, NULL, c2_TTBR1 },
1989         { Op1( 0), CRn( 2), CRm( 0), Op2( 2), access_vm_reg, NULL, c2_TTBCR },
1990         { Op1( 0), CRn( 3), CRm( 0), Op2( 0), access_vm_reg, NULL, c3_DACR },
1991         { Op1( 0), CRn( 5), CRm( 0), Op2( 0), access_vm_reg, NULL, c5_DFSR },
1992         { Op1( 0), CRn( 5), CRm( 0), Op2( 1), access_vm_reg, NULL, c5_IFSR },
1993         { Op1( 0), CRn( 5), CRm( 1), Op2( 0), access_vm_reg, NULL, c5_ADFSR },
1994         { Op1( 0), CRn( 5), CRm( 1), Op2( 1), access_vm_reg, NULL, c5_AIFSR },
1995         { Op1( 0), CRn( 6), CRm( 0), Op2( 0), access_vm_reg, NULL, c6_DFAR },
1996         { Op1( 0), CRn( 6), CRm( 0), Op2( 2), access_vm_reg, NULL, c6_IFAR },
1997
1998         /*
1999          * DC{C,I,CI}SW operations:
2000          */
2001         { Op1( 0), CRn( 7), CRm( 6), Op2( 2), access_dcsw },
2002         { Op1( 0), CRn( 7), CRm(10), Op2( 2), access_dcsw },
2003         { Op1( 0), CRn( 7), CRm(14), Op2( 2), access_dcsw },
2004
2005         /* PMU */
2006         { Op1( 0), CRn( 9), CRm(12), Op2( 0), access_pmcr },
2007         { Op1( 0), CRn( 9), CRm(12), Op2( 1), access_pmcnten },
2008         { Op1( 0), CRn( 9), CRm(12), Op2( 2), access_pmcnten },
2009         { Op1( 0), CRn( 9), CRm(12), Op2( 3), access_pmovs },
2010         { Op1( 0), CRn( 9), CRm(12), Op2( 4), access_pmswinc },
2011         { Op1( 0), CRn( 9), CRm(12), Op2( 5), access_pmselr },
2012         { Op1( 0), CRn( 9), CRm(12), Op2( 6), access_pmceid },
2013         { Op1( 0), CRn( 9), CRm(12), Op2( 7), access_pmceid },
2014         { Op1( 0), CRn( 9), CRm(13), Op2( 0), access_pmu_evcntr },
2015         { Op1( 0), CRn( 9), CRm(13), Op2( 1), access_pmu_evtyper },
2016         { Op1( 0), CRn( 9), CRm(13), Op2( 2), access_pmu_evcntr },
2017         { Op1( 0), CRn( 9), CRm(14), Op2( 0), access_pmuserenr },
2018         { Op1( 0), CRn( 9), CRm(14), Op2( 1), access_pminten },
2019         { Op1( 0), CRn( 9), CRm(14), Op2( 2), access_pminten },
2020         { Op1( 0), CRn( 9), CRm(14), Op2( 3), access_pmovs },
2021
2022         { Op1( 0), CRn(10), CRm( 2), Op2( 0), access_vm_reg, NULL, c10_PRRR },
2023         { Op1( 0), CRn(10), CRm( 2), Op2( 1), access_vm_reg, NULL, c10_NMRR },
2024         { Op1( 0), CRn(10), CRm( 3), Op2( 0), access_vm_reg, NULL, c10_AMAIR0 },
2025         { Op1( 0), CRn(10), CRm( 3), Op2( 1), access_vm_reg, NULL, c10_AMAIR1 },
2026
2027         /* ICC_SRE */
2028         { Op1( 0), CRn(12), CRm(12), Op2( 5), access_gic_sre },
2029
2030         { Op1( 0), CRn(13), CRm( 0), Op2( 1), access_vm_reg, NULL, c13_CID },
2031
2032         /* Arch Tmers */
2033         { SYS_DESC(SYS_AARCH32_CNTP_TVAL), access_arch_timer },
2034         { SYS_DESC(SYS_AARCH32_CNTP_CTL), access_arch_timer },
2035
2036         /* PMEVCNTRn */
2037         PMU_PMEVCNTR(0),
2038         PMU_PMEVCNTR(1),
2039         PMU_PMEVCNTR(2),
2040         PMU_PMEVCNTR(3),
2041         PMU_PMEVCNTR(4),
2042         PMU_PMEVCNTR(5),
2043         PMU_PMEVCNTR(6),
2044         PMU_PMEVCNTR(7),
2045         PMU_PMEVCNTR(8),
2046         PMU_PMEVCNTR(9),
2047         PMU_PMEVCNTR(10),
2048         PMU_PMEVCNTR(11),
2049         PMU_PMEVCNTR(12),
2050         PMU_PMEVCNTR(13),
2051         PMU_PMEVCNTR(14),
2052         PMU_PMEVCNTR(15),
2053         PMU_PMEVCNTR(16),
2054         PMU_PMEVCNTR(17),
2055         PMU_PMEVCNTR(18),
2056         PMU_PMEVCNTR(19),
2057         PMU_PMEVCNTR(20),
2058         PMU_PMEVCNTR(21),
2059         PMU_PMEVCNTR(22),
2060         PMU_PMEVCNTR(23),
2061         PMU_PMEVCNTR(24),
2062         PMU_PMEVCNTR(25),
2063         PMU_PMEVCNTR(26),
2064         PMU_PMEVCNTR(27),
2065         PMU_PMEVCNTR(28),
2066         PMU_PMEVCNTR(29),
2067         PMU_PMEVCNTR(30),
2068         /* PMEVTYPERn */
2069         PMU_PMEVTYPER(0),
2070         PMU_PMEVTYPER(1),
2071         PMU_PMEVTYPER(2),
2072         PMU_PMEVTYPER(3),
2073         PMU_PMEVTYPER(4),
2074         PMU_PMEVTYPER(5),
2075         PMU_PMEVTYPER(6),
2076         PMU_PMEVTYPER(7),
2077         PMU_PMEVTYPER(8),
2078         PMU_PMEVTYPER(9),
2079         PMU_PMEVTYPER(10),
2080         PMU_PMEVTYPER(11),
2081         PMU_PMEVTYPER(12),
2082         PMU_PMEVTYPER(13),
2083         PMU_PMEVTYPER(14),
2084         PMU_PMEVTYPER(15),
2085         PMU_PMEVTYPER(16),
2086         PMU_PMEVTYPER(17),
2087         PMU_PMEVTYPER(18),
2088         PMU_PMEVTYPER(19),
2089         PMU_PMEVTYPER(20),
2090         PMU_PMEVTYPER(21),
2091         PMU_PMEVTYPER(22),
2092         PMU_PMEVTYPER(23),
2093         PMU_PMEVTYPER(24),
2094         PMU_PMEVTYPER(25),
2095         PMU_PMEVTYPER(26),
2096         PMU_PMEVTYPER(27),
2097         PMU_PMEVTYPER(28),
2098         PMU_PMEVTYPER(29),
2099         PMU_PMEVTYPER(30),
2100         /* PMCCFILTR */
2101         { Op1(0), CRn(14), CRm(15), Op2(7), access_pmu_evtyper },
2102
2103         { Op1(1), CRn( 0), CRm( 0), Op2(0), access_ccsidr },
2104         { Op1(1), CRn( 0), CRm( 0), Op2(1), access_clidr },
2105         { Op1(2), CRn( 0), CRm( 0), Op2(0), access_csselr, NULL, c0_CSSELR },
2106 };
2107
2108 static const struct sys_reg_desc cp15_64_regs[] = {
2109         { Op1( 0), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, c2_TTBR0 },
2110         { Op1( 0), CRn( 0), CRm( 9), Op2( 0), access_pmu_evcntr },
2111         { Op1( 0), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_SGI1R */
2112         { Op1( 1), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, c2_TTBR1 },
2113         { Op1( 1), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_ASGI1R */
2114         { Op1( 2), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_SGI0R */
2115         { SYS_DESC(SYS_AARCH32_CNTP_CVAL),    access_arch_timer },
2116 };
2117
2118 static int check_sysreg_table(const struct sys_reg_desc *table, unsigned int n,
2119                               bool is_32)
2120 {
2121         unsigned int i;
2122
2123         for (i = 0; i < n; i++) {
2124                 if (!is_32 && table[i].reg && !table[i].reset) {
2125                         kvm_err("sys_reg table %p entry %d has lacks reset\n",
2126                                 table, i);
2127                         return 1;
2128                 }
2129
2130                 if (i && cmp_sys_reg(&table[i-1], &table[i]) >= 0) {
2131                         kvm_err("sys_reg table %p out of order (%d)\n", table, i - 1);
2132                         return 1;
2133                 }
2134         }
2135
2136         return 0;
2137 }
2138
2139 static int match_sys_reg(const void *key, const void *elt)
2140 {
2141         const unsigned long pval = (unsigned long)key;
2142         const struct sys_reg_desc *r = elt;
2143
2144         return pval - reg_to_encoding(r);
2145 }
2146
2147 static const struct sys_reg_desc *find_reg(const struct sys_reg_params *params,
2148                                          const struct sys_reg_desc table[],
2149                                          unsigned int num)
2150 {
2151         unsigned long pval = reg_to_encoding(params);
2152
2153         return bsearch((void *)pval, table, num, sizeof(table[0]), match_sys_reg);
2154 }
2155
2156 int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu)
2157 {
2158         kvm_inject_undefined(vcpu);
2159         return 1;
2160 }
2161
2162 static void perform_access(struct kvm_vcpu *vcpu,
2163                            struct sys_reg_params *params,
2164                            const struct sys_reg_desc *r)
2165 {
2166         trace_kvm_sys_access(*vcpu_pc(vcpu), params, r);
2167
2168         /* Check for regs disabled by runtime config */
2169         if (sysreg_hidden(vcpu, r)) {
2170                 kvm_inject_undefined(vcpu);
2171                 return;
2172         }
2173
2174         /*
2175          * Not having an accessor means that we have configured a trap
2176          * that we don't know how to handle. This certainly qualifies
2177          * as a gross bug that should be fixed right away.
2178          */
2179         BUG_ON(!r->access);
2180
2181         /* Skip instruction if instructed so */
2182         if (likely(r->access(vcpu, params, r)))
2183                 kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
2184 }
2185
2186 /*
2187  * emulate_cp --  tries to match a sys_reg access in a handling table, and
2188  *                call the corresponding trap handler.
2189  *
2190  * @params: pointer to the descriptor of the access
2191  * @table: array of trap descriptors
2192  * @num: size of the trap descriptor array
2193  *
2194  * Return 0 if the access has been handled, and -1 if not.
2195  */
2196 static int emulate_cp(struct kvm_vcpu *vcpu,
2197                       struct sys_reg_params *params,
2198                       const struct sys_reg_desc *table,
2199                       size_t num)
2200 {
2201         const struct sys_reg_desc *r;
2202
2203         if (!table)
2204                 return -1;      /* Not handled */
2205
2206         r = find_reg(params, table, num);
2207
2208         if (r) {
2209                 perform_access(vcpu, params, r);
2210                 return 0;
2211         }
2212
2213         /* Not handled */
2214         return -1;
2215 }
2216
2217 static void unhandled_cp_access(struct kvm_vcpu *vcpu,
2218                                 struct sys_reg_params *params)
2219 {
2220         u8 esr_ec = kvm_vcpu_trap_get_class(vcpu);
2221         int cp = -1;
2222
2223         switch (esr_ec) {
2224         case ESR_ELx_EC_CP15_32:
2225         case ESR_ELx_EC_CP15_64:
2226                 cp = 15;
2227                 break;
2228         case ESR_ELx_EC_CP14_MR:
2229         case ESR_ELx_EC_CP14_64:
2230                 cp = 14;
2231                 break;
2232         default:
2233                 WARN_ON(1);
2234         }
2235
2236         print_sys_reg_msg(params,
2237                           "Unsupported guest CP%d access at: %08lx [%08lx]\n",
2238                           cp, *vcpu_pc(vcpu), *vcpu_cpsr(vcpu));
2239         kvm_inject_undefined(vcpu);
2240 }
2241
2242 /**
2243  * kvm_handle_cp_64 -- handles a mrrc/mcrr trap on a guest CP14/CP15 access
2244  * @vcpu: The VCPU pointer
2245  * @run:  The kvm_run struct
2246  */
2247 static int kvm_handle_cp_64(struct kvm_vcpu *vcpu,
2248                             const struct sys_reg_desc *global,
2249                             size_t nr_global)
2250 {
2251         struct sys_reg_params params;
2252         u32 esr = kvm_vcpu_get_esr(vcpu);
2253         int Rt = kvm_vcpu_sys_get_rt(vcpu);
2254         int Rt2 = (esr >> 10) & 0x1f;
2255
2256         params.is_aarch32 = true;
2257         params.is_32bit = false;
2258         params.CRm = (esr >> 1) & 0xf;
2259         params.is_write = ((esr & 1) == 0);
2260
2261         params.Op0 = 0;
2262         params.Op1 = (esr >> 16) & 0xf;
2263         params.Op2 = 0;
2264         params.CRn = 0;
2265
2266         /*
2267          * Make a 64-bit value out of Rt and Rt2. As we use the same trap
2268          * backends between AArch32 and AArch64, we get away with it.
2269          */
2270         if (params.is_write) {
2271                 params.regval = vcpu_get_reg(vcpu, Rt) & 0xffffffff;
2272                 params.regval |= vcpu_get_reg(vcpu, Rt2) << 32;
2273         }
2274
2275         /*
2276          * If the table contains a handler, handle the
2277          * potential register operation in the case of a read and return
2278          * with success.
2279          */
2280         if (!emulate_cp(vcpu, &params, global, nr_global)) {
2281                 /* Split up the value between registers for the read side */
2282                 if (!params.is_write) {
2283                         vcpu_set_reg(vcpu, Rt, lower_32_bits(params.regval));
2284                         vcpu_set_reg(vcpu, Rt2, upper_32_bits(params.regval));
2285                 }
2286
2287                 return 1;
2288         }
2289
2290         unhandled_cp_access(vcpu, &params);
2291         return 1;
2292 }
2293
2294 /**
2295  * kvm_handle_cp_32 -- handles a mrc/mcr trap on a guest CP14/CP15 access
2296  * @vcpu: The VCPU pointer
2297  * @run:  The kvm_run struct
2298  */
2299 static int kvm_handle_cp_32(struct kvm_vcpu *vcpu,
2300                             const struct sys_reg_desc *global,
2301                             size_t nr_global)
2302 {
2303         struct sys_reg_params params;
2304         u32 esr = kvm_vcpu_get_esr(vcpu);
2305         int Rt  = kvm_vcpu_sys_get_rt(vcpu);
2306
2307         params.is_aarch32 = true;
2308         params.is_32bit = true;
2309         params.CRm = (esr >> 1) & 0xf;
2310         params.regval = vcpu_get_reg(vcpu, Rt);
2311         params.is_write = ((esr & 1) == 0);
2312         params.CRn = (esr >> 10) & 0xf;
2313         params.Op0 = 0;
2314         params.Op1 = (esr >> 14) & 0x7;
2315         params.Op2 = (esr >> 17) & 0x7;
2316
2317         if (!emulate_cp(vcpu, &params, global, nr_global)) {
2318                 if (!params.is_write)
2319                         vcpu_set_reg(vcpu, Rt, params.regval);
2320                 return 1;
2321         }
2322
2323         unhandled_cp_access(vcpu, &params);
2324         return 1;
2325 }
2326
2327 int kvm_handle_cp15_64(struct kvm_vcpu *vcpu)
2328 {
2329         return kvm_handle_cp_64(vcpu, cp15_64_regs, ARRAY_SIZE(cp15_64_regs));
2330 }
2331
2332 int kvm_handle_cp15_32(struct kvm_vcpu *vcpu)
2333 {
2334         return kvm_handle_cp_32(vcpu, cp15_regs, ARRAY_SIZE(cp15_regs));
2335 }
2336
2337 int kvm_handle_cp14_64(struct kvm_vcpu *vcpu)
2338 {
2339         return kvm_handle_cp_64(vcpu, cp14_64_regs, ARRAY_SIZE(cp14_64_regs));
2340 }
2341
2342 int kvm_handle_cp14_32(struct kvm_vcpu *vcpu)
2343 {
2344         return kvm_handle_cp_32(vcpu, cp14_regs, ARRAY_SIZE(cp14_regs));
2345 }
2346
2347 static bool is_imp_def_sys_reg(struct sys_reg_params *params)
2348 {
2349         // See ARM DDI 0487E.a, section D12.3.2
2350         return params->Op0 == 3 && (params->CRn & 0b1011) == 0b1011;
2351 }
2352
2353 static int emulate_sys_reg(struct kvm_vcpu *vcpu,
2354                            struct sys_reg_params *params)
2355 {
2356         const struct sys_reg_desc *r;
2357
2358         r = find_reg(params, sys_reg_descs, ARRAY_SIZE(sys_reg_descs));
2359
2360         if (likely(r)) {
2361                 perform_access(vcpu, params, r);
2362         } else if (is_imp_def_sys_reg(params)) {
2363                 kvm_inject_undefined(vcpu);
2364         } else {
2365                 print_sys_reg_msg(params,
2366                                   "Unsupported guest sys_reg access at: %lx [%08lx]\n",
2367                                   *vcpu_pc(vcpu), *vcpu_cpsr(vcpu));
2368                 kvm_inject_undefined(vcpu);
2369         }
2370         return 1;
2371 }
2372
2373 /**
2374  * kvm_reset_sys_regs - sets system registers to reset value
2375  * @vcpu: The VCPU pointer
2376  *
2377  * This function finds the right table above and sets the registers on the
2378  * virtual CPU struct to their architecturally defined reset values.
2379  */
2380 void kvm_reset_sys_regs(struct kvm_vcpu *vcpu)
2381 {
2382         unsigned long i;
2383
2384         for (i = 0; i < ARRAY_SIZE(sys_reg_descs); i++)
2385                 if (sys_reg_descs[i].reset)
2386                         sys_reg_descs[i].reset(vcpu, &sys_reg_descs[i]);
2387 }
2388
2389 /**
2390  * kvm_handle_sys_reg -- handles a mrs/msr trap on a guest sys_reg access
2391  * @vcpu: The VCPU pointer
2392  */
2393 int kvm_handle_sys_reg(struct kvm_vcpu *vcpu)
2394 {
2395         struct sys_reg_params params;
2396         unsigned long esr = kvm_vcpu_get_esr(vcpu);
2397         int Rt = kvm_vcpu_sys_get_rt(vcpu);
2398         int ret;
2399
2400         trace_kvm_handle_sys_reg(esr);
2401
2402         params.is_aarch32 = false;
2403         params.is_32bit = false;
2404         params.Op0 = (esr >> 20) & 3;
2405         params.Op1 = (esr >> 14) & 0x7;
2406         params.CRn = (esr >> 10) & 0xf;
2407         params.CRm = (esr >> 1) & 0xf;
2408         params.Op2 = (esr >> 17) & 0x7;
2409         params.regval = vcpu_get_reg(vcpu, Rt);
2410         params.is_write = !(esr & 1);
2411
2412         ret = emulate_sys_reg(vcpu, &params);
2413
2414         if (!params.is_write)
2415                 vcpu_set_reg(vcpu, Rt, params.regval);
2416         return ret;
2417 }
2418
2419 /******************************************************************************
2420  * Userspace API
2421  *****************************************************************************/
2422
2423 static bool index_to_params(u64 id, struct sys_reg_params *params)
2424 {
2425         switch (id & KVM_REG_SIZE_MASK) {
2426         case KVM_REG_SIZE_U64:
2427                 /* Any unused index bits means it's not valid. */
2428                 if (id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK
2429                               | KVM_REG_ARM_COPROC_MASK
2430                               | KVM_REG_ARM64_SYSREG_OP0_MASK
2431                               | KVM_REG_ARM64_SYSREG_OP1_MASK
2432                               | KVM_REG_ARM64_SYSREG_CRN_MASK
2433                               | KVM_REG_ARM64_SYSREG_CRM_MASK
2434                               | KVM_REG_ARM64_SYSREG_OP2_MASK))
2435                         return false;
2436                 params->Op0 = ((id & KVM_REG_ARM64_SYSREG_OP0_MASK)
2437                                >> KVM_REG_ARM64_SYSREG_OP0_SHIFT);
2438                 params->Op1 = ((id & KVM_REG_ARM64_SYSREG_OP1_MASK)
2439                                >> KVM_REG_ARM64_SYSREG_OP1_SHIFT);
2440                 params->CRn = ((id & KVM_REG_ARM64_SYSREG_CRN_MASK)
2441                                >> KVM_REG_ARM64_SYSREG_CRN_SHIFT);
2442                 params->CRm = ((id & KVM_REG_ARM64_SYSREG_CRM_MASK)
2443                                >> KVM_REG_ARM64_SYSREG_CRM_SHIFT);
2444                 params->Op2 = ((id & KVM_REG_ARM64_SYSREG_OP2_MASK)
2445                                >> KVM_REG_ARM64_SYSREG_OP2_SHIFT);
2446                 return true;
2447         default:
2448                 return false;
2449         }
2450 }
2451
2452 const struct sys_reg_desc *find_reg_by_id(u64 id,
2453                                           struct sys_reg_params *params,
2454                                           const struct sys_reg_desc table[],
2455                                           unsigned int num)
2456 {
2457         if (!index_to_params(id, params))
2458                 return NULL;
2459
2460         return find_reg(params, table, num);
2461 }
2462
2463 /* Decode an index value, and find the sys_reg_desc entry. */
2464 static const struct sys_reg_desc *index_to_sys_reg_desc(struct kvm_vcpu *vcpu,
2465                                                     u64 id)
2466 {
2467         const struct sys_reg_desc *r;
2468         struct sys_reg_params params;
2469
2470         /* We only do sys_reg for now. */
2471         if ((id & KVM_REG_ARM_COPROC_MASK) != KVM_REG_ARM64_SYSREG)
2472                 return NULL;
2473
2474         if (!index_to_params(id, &params))
2475                 return NULL;
2476
2477         r = find_reg(&params, sys_reg_descs, ARRAY_SIZE(sys_reg_descs));
2478
2479         /* Not saved in the sys_reg array and not otherwise accessible? */
2480         if (r && !(r->reg || r->get_user))
2481                 r = NULL;
2482
2483         return r;
2484 }
2485
2486 /*
2487  * These are the invariant sys_reg registers: we let the guest see the
2488  * host versions of these, so they're part of the guest state.
2489  *
2490  * A future CPU may provide a mechanism to present different values to
2491  * the guest, or a future kvm may trap them.
2492  */
2493
2494 #define FUNCTION_INVARIANT(reg)                                         \
2495         static void get_##reg(struct kvm_vcpu *v,                       \
2496                               const struct sys_reg_desc *r)             \
2497         {                                                               \
2498                 ((struct sys_reg_desc *)r)->val = read_sysreg(reg);     \
2499         }
2500
2501 FUNCTION_INVARIANT(midr_el1)
2502 FUNCTION_INVARIANT(revidr_el1)
2503 FUNCTION_INVARIANT(clidr_el1)
2504 FUNCTION_INVARIANT(aidr_el1)
2505
2506 static void get_ctr_el0(struct kvm_vcpu *v, const struct sys_reg_desc *r)
2507 {
2508         ((struct sys_reg_desc *)r)->val = read_sanitised_ftr_reg(SYS_CTR_EL0);
2509 }
2510
2511 /* ->val is filled in by kvm_sys_reg_table_init() */
2512 static struct sys_reg_desc invariant_sys_regs[] = {
2513         { SYS_DESC(SYS_MIDR_EL1), NULL, get_midr_el1 },
2514         { SYS_DESC(SYS_REVIDR_EL1), NULL, get_revidr_el1 },
2515         { SYS_DESC(SYS_CLIDR_EL1), NULL, get_clidr_el1 },
2516         { SYS_DESC(SYS_AIDR_EL1), NULL, get_aidr_el1 },
2517         { SYS_DESC(SYS_CTR_EL0), NULL, get_ctr_el0 },
2518 };
2519
2520 static int reg_from_user(u64 *val, const void __user *uaddr, u64 id)
2521 {
2522         if (copy_from_user(val, uaddr, KVM_REG_SIZE(id)) != 0)
2523                 return -EFAULT;
2524         return 0;
2525 }
2526
2527 static int reg_to_user(void __user *uaddr, const u64 *val, u64 id)
2528 {
2529         if (copy_to_user(uaddr, val, KVM_REG_SIZE(id)) != 0)
2530                 return -EFAULT;
2531         return 0;
2532 }
2533
2534 static int get_invariant_sys_reg(u64 id, void __user *uaddr)
2535 {
2536         struct sys_reg_params params;
2537         const struct sys_reg_desc *r;
2538
2539         r = find_reg_by_id(id, &params, invariant_sys_regs,
2540                            ARRAY_SIZE(invariant_sys_regs));
2541         if (!r)
2542                 return -ENOENT;
2543
2544         return reg_to_user(uaddr, &r->val, id);
2545 }
2546
2547 static int set_invariant_sys_reg(u64 id, void __user *uaddr)
2548 {
2549         struct sys_reg_params params;
2550         const struct sys_reg_desc *r;
2551         int err;
2552         u64 val = 0; /* Make sure high bits are 0 for 32-bit regs */
2553
2554         r = find_reg_by_id(id, &params, invariant_sys_regs,
2555                            ARRAY_SIZE(invariant_sys_regs));
2556         if (!r)
2557                 return -ENOENT;
2558
2559         err = reg_from_user(&val, uaddr, id);
2560         if (err)
2561                 return err;
2562
2563         /* This is what we mean by invariant: you can't change it. */
2564         if (r->val != val)
2565                 return -EINVAL;
2566
2567         return 0;
2568 }
2569
2570 static bool is_valid_cache(u32 val)
2571 {
2572         u32 level, ctype;
2573
2574         if (val >= CSSELR_MAX)
2575                 return false;
2576
2577         /* Bottom bit is Instruction or Data bit.  Next 3 bits are level. */
2578         level = (val >> 1);
2579         ctype = (cache_levels >> (level * 3)) & 7;
2580
2581         switch (ctype) {
2582         case 0: /* No cache */
2583                 return false;
2584         case 1: /* Instruction cache only */
2585                 return (val & 1);
2586         case 2: /* Data cache only */
2587         case 4: /* Unified cache */
2588                 return !(val & 1);
2589         case 3: /* Separate instruction and data caches */
2590                 return true;
2591         default: /* Reserved: we can't know instruction or data. */
2592                 return false;
2593         }
2594 }
2595
2596 static int demux_c15_get(u64 id, void __user *uaddr)
2597 {
2598         u32 val;
2599         u32 __user *uval = uaddr;
2600
2601         /* Fail if we have unknown bits set. */
2602         if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK
2603                    | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1)))
2604                 return -ENOENT;
2605
2606         switch (id & KVM_REG_ARM_DEMUX_ID_MASK) {
2607         case KVM_REG_ARM_DEMUX_ID_CCSIDR:
2608                 if (KVM_REG_SIZE(id) != 4)
2609                         return -ENOENT;
2610                 val = (id & KVM_REG_ARM_DEMUX_VAL_MASK)
2611                         >> KVM_REG_ARM_DEMUX_VAL_SHIFT;
2612                 if (!is_valid_cache(val))
2613                         return -ENOENT;
2614
2615                 return put_user(get_ccsidr(val), uval);
2616         default:
2617                 return -ENOENT;
2618         }
2619 }
2620
2621 static int demux_c15_set(u64 id, void __user *uaddr)
2622 {
2623         u32 val, newval;
2624         u32 __user *uval = uaddr;
2625
2626         /* Fail if we have unknown bits set. */
2627         if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK
2628                    | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1)))
2629                 return -ENOENT;
2630
2631         switch (id & KVM_REG_ARM_DEMUX_ID_MASK) {
2632         case KVM_REG_ARM_DEMUX_ID_CCSIDR:
2633                 if (KVM_REG_SIZE(id) != 4)
2634                         return -ENOENT;
2635                 val = (id & KVM_REG_ARM_DEMUX_VAL_MASK)
2636                         >> KVM_REG_ARM_DEMUX_VAL_SHIFT;
2637                 if (!is_valid_cache(val))
2638                         return -ENOENT;
2639
2640                 if (get_user(newval, uval))
2641                         return -EFAULT;
2642
2643                 /* This is also invariant: you can't change it. */
2644                 if (newval != get_ccsidr(val))
2645                         return -EINVAL;
2646                 return 0;
2647         default:
2648                 return -ENOENT;
2649         }
2650 }
2651
2652 int kvm_arm_sys_reg_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
2653 {
2654         const struct sys_reg_desc *r;
2655         void __user *uaddr = (void __user *)(unsigned long)reg->addr;
2656
2657         if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX)
2658                 return demux_c15_get(reg->id, uaddr);
2659
2660         if (KVM_REG_SIZE(reg->id) != sizeof(__u64))
2661                 return -ENOENT;
2662
2663         r = index_to_sys_reg_desc(vcpu, reg->id);
2664         if (!r)
2665                 return get_invariant_sys_reg(reg->id, uaddr);
2666
2667         /* Check for regs disabled by runtime config */
2668         if (sysreg_hidden(vcpu, r))
2669                 return -ENOENT;
2670
2671         if (r->get_user)
2672                 return (r->get_user)(vcpu, r, reg, uaddr);
2673
2674         return reg_to_user(uaddr, &__vcpu_sys_reg(vcpu, r->reg), reg->id);
2675 }
2676
2677 int kvm_arm_sys_reg_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
2678 {
2679         const struct sys_reg_desc *r;
2680         void __user *uaddr = (void __user *)(unsigned long)reg->addr;
2681
2682         if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX)
2683                 return demux_c15_set(reg->id, uaddr);
2684
2685         if (KVM_REG_SIZE(reg->id) != sizeof(__u64))
2686                 return -ENOENT;
2687
2688         r = index_to_sys_reg_desc(vcpu, reg->id);
2689         if (!r)
2690                 return set_invariant_sys_reg(reg->id, uaddr);
2691
2692         /* Check for regs disabled by runtime config */
2693         if (sysreg_hidden(vcpu, r))
2694                 return -ENOENT;
2695
2696         if (r->set_user)
2697                 return (r->set_user)(vcpu, r, reg, uaddr);
2698
2699         return reg_from_user(&__vcpu_sys_reg(vcpu, r->reg), uaddr, reg->id);
2700 }
2701
2702 static unsigned int num_demux_regs(void)
2703 {
2704         unsigned int i, count = 0;
2705
2706         for (i = 0; i < CSSELR_MAX; i++)
2707                 if (is_valid_cache(i))
2708                         count++;
2709
2710         return count;
2711 }
2712
2713 static int write_demux_regids(u64 __user *uindices)
2714 {
2715         u64 val = KVM_REG_ARM64 | KVM_REG_SIZE_U32 | KVM_REG_ARM_DEMUX;
2716         unsigned int i;
2717
2718         val |= KVM_REG_ARM_DEMUX_ID_CCSIDR;
2719         for (i = 0; i < CSSELR_MAX; i++) {
2720                 if (!is_valid_cache(i))
2721                         continue;
2722                 if (put_user(val | i, uindices))
2723                         return -EFAULT;
2724                 uindices++;
2725         }
2726         return 0;
2727 }
2728
2729 static u64 sys_reg_to_index(const struct sys_reg_desc *reg)
2730 {
2731         return (KVM_REG_ARM64 | KVM_REG_SIZE_U64 |
2732                 KVM_REG_ARM64_SYSREG |
2733                 (reg->Op0 << KVM_REG_ARM64_SYSREG_OP0_SHIFT) |
2734                 (reg->Op1 << KVM_REG_ARM64_SYSREG_OP1_SHIFT) |
2735                 (reg->CRn << KVM_REG_ARM64_SYSREG_CRN_SHIFT) |
2736                 (reg->CRm << KVM_REG_ARM64_SYSREG_CRM_SHIFT) |
2737                 (reg->Op2 << KVM_REG_ARM64_SYSREG_OP2_SHIFT));
2738 }
2739
2740 static bool copy_reg_to_user(const struct sys_reg_desc *reg, u64 __user **uind)
2741 {
2742         if (!*uind)
2743                 return true;
2744
2745         if (put_user(sys_reg_to_index(reg), *uind))
2746                 return false;
2747
2748         (*uind)++;
2749         return true;
2750 }
2751
2752 static int walk_one_sys_reg(const struct kvm_vcpu *vcpu,
2753                             const struct sys_reg_desc *rd,
2754                             u64 __user **uind,
2755                             unsigned int *total)
2756 {
2757         /*
2758          * Ignore registers we trap but don't save,
2759          * and for which no custom user accessor is provided.
2760          */
2761         if (!(rd->reg || rd->get_user))
2762                 return 0;
2763
2764         if (sysreg_hidden(vcpu, rd))
2765                 return 0;
2766
2767         if (!copy_reg_to_user(rd, uind))
2768                 return -EFAULT;
2769
2770         (*total)++;
2771         return 0;
2772 }
2773
2774 /* Assumed ordered tables, see kvm_sys_reg_table_init. */
2775 static int walk_sys_regs(struct kvm_vcpu *vcpu, u64 __user *uind)
2776 {
2777         const struct sys_reg_desc *i2, *end2;
2778         unsigned int total = 0;
2779         int err;
2780
2781         i2 = sys_reg_descs;
2782         end2 = sys_reg_descs + ARRAY_SIZE(sys_reg_descs);
2783
2784         while (i2 != end2) {
2785                 err = walk_one_sys_reg(vcpu, i2++, &uind, &total);
2786                 if (err)
2787                         return err;
2788         }
2789         return total;
2790 }
2791
2792 unsigned long kvm_arm_num_sys_reg_descs(struct kvm_vcpu *vcpu)
2793 {
2794         return ARRAY_SIZE(invariant_sys_regs)
2795                 + num_demux_regs()
2796                 + walk_sys_regs(vcpu, (u64 __user *)NULL);
2797 }
2798
2799 int kvm_arm_copy_sys_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
2800 {
2801         unsigned int i;
2802         int err;
2803
2804         /* Then give them all the invariant registers' indices. */
2805         for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++) {
2806                 if (put_user(sys_reg_to_index(&invariant_sys_regs[i]), uindices))
2807                         return -EFAULT;
2808                 uindices++;
2809         }
2810
2811         err = walk_sys_regs(vcpu, uindices);
2812         if (err < 0)
2813                 return err;
2814         uindices += err;
2815
2816         return write_demux_regids(uindices);
2817 }
2818
2819 void kvm_sys_reg_table_init(void)
2820 {
2821         unsigned int i;
2822         struct sys_reg_desc clidr;
2823
2824         /* Make sure tables are unique and in order. */
2825         BUG_ON(check_sysreg_table(sys_reg_descs, ARRAY_SIZE(sys_reg_descs), false));
2826         BUG_ON(check_sysreg_table(cp14_regs, ARRAY_SIZE(cp14_regs), true));
2827         BUG_ON(check_sysreg_table(cp14_64_regs, ARRAY_SIZE(cp14_64_regs), true));
2828         BUG_ON(check_sysreg_table(cp15_regs, ARRAY_SIZE(cp15_regs), true));
2829         BUG_ON(check_sysreg_table(cp15_64_regs, ARRAY_SIZE(cp15_64_regs), true));
2830         BUG_ON(check_sysreg_table(invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs), false));
2831
2832         /* We abuse the reset function to overwrite the table itself. */
2833         for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++)
2834                 invariant_sys_regs[i].reset(NULL, &invariant_sys_regs[i]);
2835
2836         /*
2837          * CLIDR format is awkward, so clean it up.  See ARM B4.1.20:
2838          *
2839          *   If software reads the Cache Type fields from Ctype1
2840          *   upwards, once it has seen a value of 0b000, no caches
2841          *   exist at further-out levels of the hierarchy. So, for
2842          *   example, if Ctype3 is the first Cache Type field with a
2843          *   value of 0b000, the values of Ctype4 to Ctype7 must be
2844          *   ignored.
2845          */
2846         get_clidr_el1(NULL, &clidr); /* Ugly... */
2847         cache_levels = clidr.val;
2848         for (i = 0; i < 7; i++)
2849                 if (((cache_levels >> (i*3)) & 7) == 0)
2850                         break;
2851         /* Clear all higher bits. */
2852         cache_levels &= (1 << (i*3))-1;
2853 }