arch/arm64/kvm/sys_regs.c

   1 /*
   2  * Copyright (C) 2012,2013 - ARM Ltd
   3  * Author: Marc Zyngier <marc.zyngier@arm.com>
   4  *
   5  * Derived from arch/arm/kvm/coproc.c:
   6  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   7  * Authors: Rusty Russell <rusty@rustcorp.com.au>
   8  *          Christoffer Dall <c.dall@virtualopensystems.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License, version 2, as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #include <linux/kvm_host.h>
  24 #include <linux/mm.h>
  25 #include <linux/uaccess.h>
  26
  27 #include <asm/cacheflush.h>
  28 #include <asm/cputype.h>
  29 #include <asm/debug-monitors.h>
  30 #include <asm/esr.h>
  31 #include <asm/kvm_arm.h>
  32 #include <asm/kvm_asm.h>
  33 #include <asm/kvm_coproc.h>
  34 #include <asm/kvm_emulate.h>
  35 #include <asm/kvm_host.h>
  36 #include <asm/kvm_mmu.h>
  37
  38 #include <trace/events/kvm.h>
  39
  40 #include "sys_regs.h"
  41
  42 #include "trace.h"
  43
  44 /*
  45  * All of this file is extremly similar to the ARM coproc.c, but the
  46  * types are different. My gut feeling is that it should be pretty
  47  * easy to merge, but that would be an ABI breakage -- again. VFP
  48  * would also need to be abstracted.
  49  *
  50  * For AArch32, we only take care of what is being trapped. Anything
  51  * that has to do with init and userspace access has to go via the
  52  * 64bit interface.
  53  */
  54
  55 /* 3 bits per cache level, as per CLIDR, but non-existent caches always 0 */
  56 static u32 cache_levels;
  57
  58 /* CSSELR values; used to index KVM_REG_ARM_DEMUX_ID_CCSIDR */
  59 #define CSSELR_MAX 12
  60
  61 /* Which cache CCSIDR represents depends on CSSELR value. */
  62 static u32 get_ccsidr(u32 csselr)
  63 {
  64         u32 ccsidr;
  65
  66         /* Make sure noone else changes CSSELR during this! */
  67         local_irq_disable();
  68         /* Put value into CSSELR */
  69         asm volatile("msr csselr_el1, %x0" : : "r" (csselr));
  70         isb();
  71         /* Read result out of CCSIDR */
  72         asm volatile("mrs %0, ccsidr_el1" : "=r" (ccsidr));
  73         local_irq_enable();
  74
  75         return ccsidr;
  76 }
  77
  78 /*
  79  * See note at ARMv7 ARM B1.14.4 (TL;DR: S/W ops are not easily virtualized).
  80  */
  81 static bool access_dcsw(struct kvm_vcpu *vcpu,
  82                         struct sys_reg_params *p,
  83                         const struct sys_reg_desc *r)
  84 {
  85         if (!p->is_write)
  86                 return read_from_write_only(vcpu, p);
  87
  88         kvm_set_way_flush(vcpu);
  89         return true;
  90 }
  91
  92 /*
  93  * Generic accessor for VM registers. Only called as long as HCR_TVM
  94  * is set. If the guest enables the MMU, we stop trapping the VM
  95  * sys_regs and leave it in complete control of the caches.
  96  */
  97 static bool access_vm_reg(struct kvm_vcpu *vcpu,
  98                           struct sys_reg_params *p,
  99                           const struct sys_reg_desc *r)
 100 {
 101         bool was_enabled = vcpu_has_cache_enabled(vcpu);
 102
 103         BUG_ON(!p->is_write);
 104
 105         if (!p->is_aarch32) {
 106                 vcpu_sys_reg(vcpu, r->reg) = p->regval;
 107         } else {
 108                 if (!p->is_32bit)
 109                         vcpu_cp15_64_high(vcpu, r->reg) = upper_32_bits(p->regval);
 110                 vcpu_cp15_64_low(vcpu, r->reg) = lower_32_bits(p->regval);
 111         }
 112
 113         kvm_toggle_cache(vcpu, was_enabled);
 114         return true;
 115 }
 116
 117 /*
 118  * Trap handler for the GICv3 SGI generation system register.
 119  * Forward the request to the VGIC emulation.
 120  * The cp15_64 code makes sure this automatically works
 121  * for both AArch64 and AArch32 accesses.
 122  */
 123 static bool access_gic_sgi(struct kvm_vcpu *vcpu,
 124                            struct sys_reg_params *p,
 125                            const struct sys_reg_desc *r)
 126 {
 127         if (!p->is_write)
 128                 return read_from_write_only(vcpu, p);
 129
 130         vgic_v3_dispatch_sgi(vcpu, p->regval);
 131
 132         return true;
 133 }
 134
 135 static bool trap_raz_wi(struct kvm_vcpu *vcpu,
 136                         struct sys_reg_params *p,
 137                         const struct sys_reg_desc *r)
 138 {
 139         if (p->is_write)
 140                 return ignore_write(vcpu, p);
 141         else
 142                 return read_zero(vcpu, p);
 143 }
 144
 145 static bool trap_oslsr_el1(struct kvm_vcpu *vcpu,
 146                            struct sys_reg_params *p,
 147                            const struct sys_reg_desc *r)
 148 {
 149         if (p->is_write) {
 150                 return ignore_write(vcpu, p);
 151         } else {
 152                 p->regval = (1 << 3);
 153                 return true;
 154         }
 155 }
 156
 157 static bool trap_dbgauthstatus_el1(struct kvm_vcpu *vcpu,
 158                                    struct sys_reg_params *p,
 159                                    const struct sys_reg_desc *r)
 160 {
 161         if (p->is_write) {
 162                 return ignore_write(vcpu, p);
 163         } else {
 164                 u32 val;
 165                 asm volatile("mrs %0, dbgauthstatus_el1" : "=r" (val));
 166                 p->regval = val;
 167                 return true;
 168         }
 169 }
 170
 171 /*
 172  * We want to avoid world-switching all the DBG registers all the
 173  * time:
 174  *
 175  * - If we've touched any debug register, it is likely that we're
 176  *   going to touch more of them. It then makes sense to disable the
 177  *   traps and start doing the save/restore dance
 178  * - If debug is active (DBG_MDSCR_KDE or DBG_MDSCR_MDE set), it is
 179  *   then mandatory to save/restore the registers, as the guest
 180  *   depends on them.
 181  *
 182  * For this, we use a DIRTY bit, indicating the guest has modified the
 183  * debug registers, used as follow:
 184  *
 185  * On guest entry:
 186  * - If the dirty bit is set (because we're coming back from trapping),
 187  *   disable the traps, save host registers, restore guest registers.
 188  * - If debug is actively in use (DBG_MDSCR_KDE or DBG_MDSCR_MDE set),
 189  *   set the dirty bit, disable the traps, save host registers,
 190  *   restore guest registers.
 191  * - Otherwise, enable the traps
 192  *
 193  * On guest exit:
 194  * - If the dirty bit is set, save guest registers, restore host
 195  *   registers and clear the dirty bit. This ensure that the host can
 196  *   now use the debug registers.
 197  */
 198 static bool trap_debug_regs(struct kvm_vcpu *vcpu,
 199                             struct sys_reg_params *p,
 200                             const struct sys_reg_desc *r)
 201 {
 202         if (p->is_write) {
 203                 vcpu_sys_reg(vcpu, r->reg) = p->regval;
 204                 vcpu->arch.debug_flags |= KVM_ARM64_DEBUG_DIRTY;
 205         } else {
 206                 p->regval = vcpu_sys_reg(vcpu, r->reg);
 207         }
 208
 209         trace_trap_reg(__func__, r->reg, p->is_write, p->regval);
 210
 211         return true;
 212 }
 213
 214 /*
 215  * reg_to_dbg/dbg_to_reg
 216  *
 217  * A 32 bit write to a debug register leave top bits alone
 218  * A 32 bit read from a debug register only returns the bottom bits
 219  *
 220  * All writes will set the KVM_ARM64_DEBUG_DIRTY flag to ensure the
 221  * hyp.S code switches between host and guest values in future.
 222  */
 223 static void reg_to_dbg(struct kvm_vcpu *vcpu,
 224                        struct sys_reg_params *p,
 225                        u64 *dbg_reg)
 226 {
 227         u64 val = p->regval;
 228
 229         if (p->is_32bit) {
 230                 val &= 0xffffffffUL;
 231                 val |= ((*dbg_reg >> 32) << 32);
 232         }
 233
 234         *dbg_reg = val;
 235         vcpu->arch.debug_flags |= KVM_ARM64_DEBUG_DIRTY;
 236 }
 237
 238 static void dbg_to_reg(struct kvm_vcpu *vcpu,
 239                        struct sys_reg_params *p,
 240                        u64 *dbg_reg)
 241 {
 242         p->regval = *dbg_reg;
 243         if (p->is_32bit)
 244                 p->regval &= 0xffffffffUL;
 245 }
 246
 247 static bool trap_bvr(struct kvm_vcpu *vcpu,
 248                      struct sys_reg_params *p,
 249                      const struct sys_reg_desc *rd)
 250 {
 251         u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg];
 252
 253         if (p->is_write)
 254                 reg_to_dbg(vcpu, p, dbg_reg);
 255         else
 256                 dbg_to_reg(vcpu, p, dbg_reg);
 257
 258         trace_trap_reg(__func__, rd->reg, p->is_write, *dbg_reg);
 259
 260         return true;
 261 }
 262
 263 static int set_bvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
 264                 const struct kvm_one_reg *reg, void __user *uaddr)
 265 {
 266         __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg];
 267
 268         if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0)
 269                 return -EFAULT;
 270         return 0;
 271 }
 272
 273 static int get_bvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
 274         const struct kvm_one_reg *reg, void __user *uaddr)
 275 {
 276         __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg];
 277
 278         if (copy_to_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0)
 279                 return -EFAULT;
 280         return 0;
 281 }
 282
 283 static void reset_bvr(struct kvm_vcpu *vcpu,
 284                       const struct sys_reg_desc *rd)
 285 {
 286         vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg] = rd->val;
 287 }
 288
 289 static bool trap_bcr(struct kvm_vcpu *vcpu,
 290                      struct sys_reg_params *p,
 291                      const struct sys_reg_desc *rd)
 292 {
 293         u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg];
 294
 295         if (p->is_write)
 296                 reg_to_dbg(vcpu, p, dbg_reg);
 297         else
 298                 dbg_to_reg(vcpu, p, dbg_reg);
 299
 300         trace_trap_reg(__func__, rd->reg, p->is_write, *dbg_reg);
 301
 302         return true;
 303 }
 304
 305 static int set_bcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
 306                 const struct kvm_one_reg *reg, void __user *uaddr)
 307 {
 308         __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg];
 309
 310         if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0)
 311                 return -EFAULT;
 312
 313         return 0;
 314 }
 315
 316 static int get_bcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
 317         const struct kvm_one_reg *reg, void __user *uaddr)
 318 {
 319         __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg];
 320
 321         if (copy_to_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0)
 322                 return -EFAULT;
 323         return 0;
 324 }
 325
 326 static void reset_bcr(struct kvm_vcpu *vcpu,
 327                       const struct sys_reg_desc *rd)
 328 {
 329         vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg] = rd->val;
 330 }
 331
 332 static bool trap_wvr(struct kvm_vcpu *vcpu,
 333                      struct sys_reg_params *p,
 334                      const struct sys_reg_desc *rd)
 335 {
 336         u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg];
 337
 338         if (p->is_write)
 339                 reg_to_dbg(vcpu, p, dbg_reg);
 340         else
 341                 dbg_to_reg(vcpu, p, dbg_reg);
 342
 343         trace_trap_reg(__func__, rd->reg, p->is_write,
 344                 vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg]);
 345
 346         return true;
 347 }
 348
 349 static int set_wvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
 350                 const struct kvm_one_reg *reg, void __user *uaddr)
 351 {
 352         __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg];
 353
 354         if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0)
 355                 return -EFAULT;
 356         return 0;
 357 }
 358
 359 static int get_wvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
 360         const struct kvm_one_reg *reg, void __user *uaddr)
 361 {
 362         __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg];
 363
 364         if (copy_to_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0)
 365                 return -EFAULT;
 366         return 0;
 367 }
 368
 369 static void reset_wvr(struct kvm_vcpu *vcpu,
 370                       const struct sys_reg_desc *rd)
 371 {
 372         vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg] = rd->val;
 373 }
 374
 375 static bool trap_wcr(struct kvm_vcpu *vcpu,
 376                      struct sys_reg_params *p,
 377                      const struct sys_reg_desc *rd)
 378 {
 379         u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg];
 380
 381         if (p->is_write)
 382                 reg_to_dbg(vcpu, p, dbg_reg);
 383         else
 384                 dbg_to_reg(vcpu, p, dbg_reg);
 385
 386         trace_trap_reg(__func__, rd->reg, p->is_write, *dbg_reg);
 387
 388         return true;
 389 }
 390
 391 static int set_wcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
 392                 const struct kvm_one_reg *reg, void __user *uaddr)
 393 {
 394         __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg];
 395
 396         if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0)
 397                 return -EFAULT;
 398         return 0;
 399 }
 400
 401 static int get_wcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
 402         const struct kvm_one_reg *reg, void __user *uaddr)
 403 {
 404         __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg];
 405
 406         if (copy_to_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0)
 407                 return -EFAULT;
 408         return 0;
 409 }
 410
 411 static void reset_wcr(struct kvm_vcpu *vcpu,
 412                       const struct sys_reg_desc *rd)
 413 {
 414         vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg] = rd->val;
 415 }
 416
 417 static void reset_amair_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
 418 {
 419         u64 amair;
 420
 421         asm volatile("mrs %0, amair_el1\n" : "=r" (amair));
 422         vcpu_sys_reg(vcpu, AMAIR_EL1) = amair;
 423 }
 424
 425 static void reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
 426 {
 427         u64 mpidr;
 428
 429         /*
 430          * Map the vcpu_id into the first three affinity level fields of
 431          * the MPIDR. We limit the number of VCPUs in level 0 due to a
 432          * limitation to 16 CPUs in that level in the ICC_SGIxR registers
 433          * of the GICv3 to be able to address each CPU directly when
 434          * sending IPIs.
 435          */
 436         mpidr = (vcpu->vcpu_id & 0x0f) << MPIDR_LEVEL_SHIFT(0);
 437         mpidr |= ((vcpu->vcpu_id >> 4) & 0xff) << MPIDR_LEVEL_SHIFT(1);
 438         mpidr |= ((vcpu->vcpu_id >> 12) & 0xff) << MPIDR_LEVEL_SHIFT(2);
 439         vcpu_sys_reg(vcpu, MPIDR_EL1) = (1ULL << 31) | mpidr;
 440 }
 441
 442 /* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go */
 443 #define DBG_BCR_BVR_WCR_WVR_EL1(n)                                      \
 444         /* DBGBVRn_EL1 */                                               \
 445         { Op0(0b10), Op1(0b000), CRn(0b0000), CRm((n)), Op2(0b100),     \
 446           trap_bvr, reset_bvr, n, 0, get_bvr, set_bvr },                \
 447         /* DBGBCRn_EL1 */                                               \
 448         { Op0(0b10), Op1(0b000), CRn(0b0000), CRm((n)), Op2(0b101),     \
 449           trap_bcr, reset_bcr, n, 0, get_bcr, set_bcr },                \
 450         /* DBGWVRn_EL1 */                                               \
 451         { Op0(0b10), Op1(0b000), CRn(0b0000), CRm((n)), Op2(0b110),     \
 452           trap_wvr, reset_wvr, n, 0,  get_wvr, set_wvr },               \
 453         /* DBGWCRn_EL1 */                                               \
 454         { Op0(0b10), Op1(0b000), CRn(0b0000), CRm((n)), Op2(0b111),     \
 455           trap_wcr, reset_wcr, n, 0,  get_wcr, set_wcr }
 456
 457 /*
 458  * Architected system registers.
 459  * Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2
 460  *
 461  * We could trap ID_DFR0 and tell the guest we don't support performance
 462  * monitoring.  Unfortunately the patch to make the kernel check ID_DFR0 was
 463  * NAKed, so it will read the PMCR anyway.
 464  *
 465  * Therefore we tell the guest we have 0 counters.  Unfortunately, we
 466  * must always support PMCCNTR (the cycle counter): we just RAZ/WI for
 467  * all PM registers, which doesn't crash the guest kernel at least.
 468  *
 469  * Debug handling: We do trap most, if not all debug related system
 470  * registers. The implementation is good enough to ensure that a guest
 471  * can use these with minimal performance degradation. The drawback is
 472  * that we don't implement any of the external debug, none of the
 473  * OSlock protocol. This should be revisited if we ever encounter a
 474  * more demanding guest...
 475  */
 476 static const struct sys_reg_desc sys_reg_descs[] = {
 477         /* DC ISW */
 478         { Op0(0b01), Op1(0b000), CRn(0b0111), CRm(0b0110), Op2(0b010),
 479           access_dcsw },
 480         /* DC CSW */
 481         { Op0(0b01), Op1(0b000), CRn(0b0111), CRm(0b1010), Op2(0b010),
 482           access_dcsw },
 483         /* DC CISW */
 484         { Op0(0b01), Op1(0b000), CRn(0b0111), CRm(0b1110), Op2(0b010),
 485           access_dcsw },
 486
 487         DBG_BCR_BVR_WCR_WVR_EL1(0),
 488         DBG_BCR_BVR_WCR_WVR_EL1(1),
 489         /* MDCCINT_EL1 */
 490         { Op0(0b10), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b000),
 491           trap_debug_regs, reset_val, MDCCINT_EL1, 0 },
 492         /* MDSCR_EL1 */
 493         { Op0(0b10), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b010),
 494           trap_debug_regs, reset_val, MDSCR_EL1, 0 },
 495         DBG_BCR_BVR_WCR_WVR_EL1(2),
 496         DBG_BCR_BVR_WCR_WVR_EL1(3),
 497         DBG_BCR_BVR_WCR_WVR_EL1(4),
 498         DBG_BCR_BVR_WCR_WVR_EL1(5),
 499         DBG_BCR_BVR_WCR_WVR_EL1(6),
 500         DBG_BCR_BVR_WCR_WVR_EL1(7),
 501         DBG_BCR_BVR_WCR_WVR_EL1(8),
 502         DBG_BCR_BVR_WCR_WVR_EL1(9),
 503         DBG_BCR_BVR_WCR_WVR_EL1(10),
 504         DBG_BCR_BVR_WCR_WVR_EL1(11),
 505         DBG_BCR_BVR_WCR_WVR_EL1(12),
 506         DBG_BCR_BVR_WCR_WVR_EL1(13),
 507         DBG_BCR_BVR_WCR_WVR_EL1(14),
 508         DBG_BCR_BVR_WCR_WVR_EL1(15),
 509
 510         /* MDRAR_EL1 */
 511         { Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b000),
 512           trap_raz_wi },
 513         /* OSLAR_EL1 */
 514         { Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b100),
 515           trap_raz_wi },
 516         /* OSLSR_EL1 */
 517         { Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0001), Op2(0b100),
 518           trap_oslsr_el1 },
 519         /* OSDLR_EL1 */
 520         { Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0011), Op2(0b100),
 521           trap_raz_wi },
 522         /* DBGPRCR_EL1 */
 523         { Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0100), Op2(0b100),
 524           trap_raz_wi },
 525         /* DBGCLAIMSET_EL1 */
 526         { Op0(0b10), Op1(0b000), CRn(0b0111), CRm(0b1000), Op2(0b110),
 527           trap_raz_wi },
 528         /* DBGCLAIMCLR_EL1 */
 529         { Op0(0b10), Op1(0b000), CRn(0b0111), CRm(0b1001), Op2(0b110),
 530           trap_raz_wi },
 531         /* DBGAUTHSTATUS_EL1 */
 532         { Op0(0b10), Op1(0b000), CRn(0b0111), CRm(0b1110), Op2(0b110),
 533           trap_dbgauthstatus_el1 },
 534
 535         /* MDCCSR_EL1 */
 536         { Op0(0b10), Op1(0b011), CRn(0b0000), CRm(0b0001), Op2(0b000),
 537           trap_raz_wi },
 538         /* DBGDTR_EL0 */
 539         { Op0(0b10), Op1(0b011), CRn(0b0000), CRm(0b0100), Op2(0b000),
 540           trap_raz_wi },
 541         /* DBGDTR[TR]X_EL0 */
 542         { Op0(0b10), Op1(0b011), CRn(0b0000), CRm(0b0101), Op2(0b000),
 543           trap_raz_wi },
 544
 545         /* DBGVCR32_EL2 */
 546         { Op0(0b10), Op1(0b100), CRn(0b0000), CRm(0b0111), Op2(0b000),
 547           NULL, reset_val, DBGVCR32_EL2, 0 },
 548
 549         /* MPIDR_EL1 */
 550         { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0000), Op2(0b101),
 551           NULL, reset_mpidr, MPIDR_EL1 },
 552         /* SCTLR_EL1 */
 553         { Op0(0b11), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b000),
 554           access_vm_reg, reset_val, SCTLR_EL1, 0x00C50078 },
 555         /* CPACR_EL1 */
 556         { Op0(0b11), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b010),
 557           NULL, reset_val, CPACR_EL1, 0 },
 558         /* TTBR0_EL1 */
 559         { Op0(0b11), Op1(0b000), CRn(0b0010), CRm(0b0000), Op2(0b000),
 560           access_vm_reg, reset_unknown, TTBR0_EL1 },
 561         /* TTBR1_EL1 */
 562         { Op0(0b11), Op1(0b000), CRn(0b0010), CRm(0b0000), Op2(0b001),
 563           access_vm_reg, reset_unknown, TTBR1_EL1 },
 564         /* TCR_EL1 */
 565         { Op0(0b11), Op1(0b000), CRn(0b0010), CRm(0b0000), Op2(0b010),
 566           access_vm_reg, reset_val, TCR_EL1, 0 },
 567
 568         /* AFSR0_EL1 */
 569         { Op0(0b11), Op1(0b000), CRn(0b0101), CRm(0b0001), Op2(0b000),
 570           access_vm_reg, reset_unknown, AFSR0_EL1 },
 571         /* AFSR1_EL1 */
 572         { Op0(0b11), Op1(0b000), CRn(0b0101), CRm(0b0001), Op2(0b001),
 573           access_vm_reg, reset_unknown, AFSR1_EL1 },
 574         /* ESR_EL1 */
 575         { Op0(0b11), Op1(0b000), CRn(0b0101), CRm(0b0010), Op2(0b000),
 576           access_vm_reg, reset_unknown, ESR_EL1 },
 577         /* FAR_EL1 */
 578         { Op0(0b11), Op1(0b000), CRn(0b0110), CRm(0b0000), Op2(0b000),
 579           access_vm_reg, reset_unknown, FAR_EL1 },
 580         /* PAR_EL1 */
 581         { Op0(0b11), Op1(0b000), CRn(0b0111), CRm(0b0100), Op2(0b000),
 582           NULL, reset_unknown, PAR_EL1 },
 583
 584         /* PMINTENSET_EL1 */
 585         { Op0(0b11), Op1(0b000), CRn(0b1001), CRm(0b1110), Op2(0b001),
 586           trap_raz_wi },
 587         /* PMINTENCLR_EL1 */
 588         { Op0(0b11), Op1(0b000), CRn(0b1001), CRm(0b1110), Op2(0b010),
 589           trap_raz_wi },
 590
 591         /* MAIR_EL1 */
 592         { Op0(0b11), Op1(0b000), CRn(0b1010), CRm(0b0010), Op2(0b000),
 593           access_vm_reg, reset_unknown, MAIR_EL1 },
 594         /* AMAIR_EL1 */
 595         { Op0(0b11), Op1(0b000), CRn(0b1010), CRm(0b0011), Op2(0b000),
 596           access_vm_reg, reset_amair_el1, AMAIR_EL1 },
 597
 598         /* VBAR_EL1 */
 599         { Op0(0b11), Op1(0b000), CRn(0b1100), CRm(0b0000), Op2(0b000),
 600           NULL, reset_val, VBAR_EL1, 0 },
 601
 602         /* ICC_SGI1R_EL1 */
 603         { Op0(0b11), Op1(0b000), CRn(0b1100), CRm(0b1011), Op2(0b101),
 604           access_gic_sgi },
 605         /* ICC_SRE_EL1 */
 606         { Op0(0b11), Op1(0b000), CRn(0b1100), CRm(0b1100), Op2(0b101),
 607           trap_raz_wi },
 608
 609         /* CONTEXTIDR_EL1 */
 610         { Op0(0b11), Op1(0b000), CRn(0b1101), CRm(0b0000), Op2(0b001),
 611           access_vm_reg, reset_val, CONTEXTIDR_EL1, 0 },
 612         /* TPIDR_EL1 */
 613         { Op0(0b11), Op1(0b000), CRn(0b1101), CRm(0b0000), Op2(0b100),
 614           NULL, reset_unknown, TPIDR_EL1 },
 615
 616         /* CNTKCTL_EL1 */
 617         { Op0(0b11), Op1(0b000), CRn(0b1110), CRm(0b0001), Op2(0b000),
 618           NULL, reset_val, CNTKCTL_EL1, 0},
 619
 620         /* CSSELR_EL1 */
 621         { Op0(0b11), Op1(0b010), CRn(0b0000), CRm(0b0000), Op2(0b000),
 622           NULL, reset_unknown, CSSELR_EL1 },
 623
 624         /* PMCR_EL0 */
 625         { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b000),
 626           trap_raz_wi },
 627         /* PMCNTENSET_EL0 */
 628         { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b001),
 629           trap_raz_wi },
 630         /* PMCNTENCLR_EL0 */
 631         { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b010),
 632           trap_raz_wi },
 633         /* PMOVSCLR_EL0 */
 634         { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b011),
 635           trap_raz_wi },
 636         /* PMSWINC_EL0 */
 637         { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b100),
 638           trap_raz_wi },
 639         /* PMSELR_EL0 */
 640         { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b101),
 641           trap_raz_wi },
 642         /* PMCEID0_EL0 */
 643         { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b110),
 644           trap_raz_wi },
 645         /* PMCEID1_EL0 */
 646         { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b111),
 647           trap_raz_wi },
 648         /* PMCCNTR_EL0 */
 649         { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b000),
 650           trap_raz_wi },
 651         /* PMXEVTYPER_EL0 */
 652         { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b001),
 653           trap_raz_wi },
 654         /* PMXEVCNTR_EL0 */
 655         { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b010),
 656           trap_raz_wi },
 657         /* PMUSERENR_EL0 */
 658         { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1110), Op2(0b000),
 659           trap_raz_wi },
 660         /* PMOVSSET_EL0 */
 661         { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1110), Op2(0b011),
 662           trap_raz_wi },
 663
 664         /* TPIDR_EL0 */
 665         { Op0(0b11), Op1(0b011), CRn(0b1101), CRm(0b0000), Op2(0b010),
 666           NULL, reset_unknown, TPIDR_EL0 },
 667         /* TPIDRRO_EL0 */
 668         { Op0(0b11), Op1(0b011), CRn(0b1101), CRm(0b0000), Op2(0b011),
 669           NULL, reset_unknown, TPIDRRO_EL0 },
 670
 671         /* DACR32_EL2 */
 672         { Op0(0b11), Op1(0b100), CRn(0b0011), CRm(0b0000), Op2(0b000),
 673           NULL, reset_unknown, DACR32_EL2 },
 674         /* IFSR32_EL2 */
 675         { Op0(0b11), Op1(0b100), CRn(0b0101), CRm(0b0000), Op2(0b001),
 676           NULL, reset_unknown, IFSR32_EL2 },
 677         /* FPEXC32_EL2 */
 678         { Op0(0b11), Op1(0b100), CRn(0b0101), CRm(0b0011), Op2(0b000),
 679           NULL, reset_val, FPEXC32_EL2, 0x70 },
 680 };
 681
 682 static bool trap_dbgidr(struct kvm_vcpu *vcpu,
 683                         struct sys_reg_params *p,
 684                         const struct sys_reg_desc *r)
 685 {
 686         if (p->is_write) {
 687                 return ignore_write(vcpu, p);
 688         } else {
 689                 u64 dfr = read_system_reg(SYS_ID_AA64DFR0_EL1);
 690                 u64 pfr = read_system_reg(SYS_ID_AA64PFR0_EL1);
 691                 u32 el3 = !!cpuid_feature_extract_field(pfr, ID_AA64PFR0_EL3_SHIFT);
 692
 693                 p->regval = ((((dfr >> ID_AA64DFR0_WRPS_SHIFT) & 0xf) << 28) |
 694                              (((dfr >> ID_AA64DFR0_BRPS_SHIFT) & 0xf) << 24) |
 695                              (((dfr >> ID_AA64DFR0_CTX_CMPS_SHIFT) & 0xf) << 20)
 696                              | (6 << 16) | (el3 << 14) | (el3 << 12));
 697                 return true;
 698         }
 699 }
 700
 701 static bool trap_debug32(struct kvm_vcpu *vcpu,
 702                          struct sys_reg_params *p,
 703                          const struct sys_reg_desc *r)
 704 {
 705         if (p->is_write) {
 706                 vcpu_cp14(vcpu, r->reg) = p->regval;
 707                 vcpu->arch.debug_flags |= KVM_ARM64_DEBUG_DIRTY;
 708         } else {
 709                 p->regval = vcpu_cp14(vcpu, r->reg);
 710         }
 711
 712         return true;
 713 }
 714
 715 /* AArch32 debug register mappings
 716  *
 717  * AArch32 DBGBVRn is mapped to DBGBVRn_EL1[31:0]
 718  * AArch32 DBGBXVRn is mapped to DBGBVRn_EL1[63:32]
 719  *
 720  * All control registers and watchpoint value registers are mapped to
 721  * the lower 32 bits of their AArch64 equivalents. We share the trap
 722  * handlers with the above AArch64 code which checks what mode the
 723  * system is in.
 724  */
 725
 726 static bool trap_xvr(struct kvm_vcpu *vcpu,
 727                      struct sys_reg_params *p,
 728                      const struct sys_reg_desc *rd)
 729 {
 730         u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg];
 731
 732         if (p->is_write) {
 733                 u64 val = *dbg_reg;
 734
 735                 val &= 0xffffffffUL;
 736                 val |= p->regval << 32;
 737                 *dbg_reg = val;
 738
 739                 vcpu->arch.debug_flags |= KVM_ARM64_DEBUG_DIRTY;
 740         } else {
 741                 p->regval = *dbg_reg >> 32;
 742         }
 743
 744         trace_trap_reg(__func__, rd->reg, p->is_write, *dbg_reg);
 745
 746         return true;
 747 }
 748
 749 #define DBG_BCR_BVR_WCR_WVR(n)                                          \
 750         /* DBGBVRn */                                                   \
 751         { Op1( 0), CRn( 0), CRm((n)), Op2( 4), trap_bvr, NULL, n },     \
 752         /* DBGBCRn */                                                   \
 753         { Op1( 0), CRn( 0), CRm((n)), Op2( 5), trap_bcr, NULL, n },     \
 754         /* DBGWVRn */                                                   \
 755         { Op1( 0), CRn( 0), CRm((n)), Op2( 6), trap_wvr, NULL, n },     \
 756         /* DBGWCRn */                                                   \
 757         { Op1( 0), CRn( 0), CRm((n)), Op2( 7), trap_wcr, NULL, n }
 758
 759 #define DBGBXVR(n)                                                      \
 760         { Op1( 0), CRn( 1), CRm((n)), Op2( 1), trap_xvr, NULL, n }
 761
 762 /*
 763  * Trapped cp14 registers. We generally ignore most of the external
 764  * debug, on the principle that they don't really make sense to a
 765  * guest. Revisit this one day, would this principle change.
 766  */
 767 static const struct sys_reg_desc cp14_regs[] = {
 768         /* DBGIDR */
 769         { Op1( 0), CRn( 0), CRm( 0), Op2( 0), trap_dbgidr },
 770         /* DBGDTRRXext */
 771         { Op1( 0), CRn( 0), CRm( 0), Op2( 2), trap_raz_wi },
 772
 773         DBG_BCR_BVR_WCR_WVR(0),
 774         /* DBGDSCRint */
 775         { Op1( 0), CRn( 0), CRm( 1), Op2( 0), trap_raz_wi },
 776         DBG_BCR_BVR_WCR_WVR(1),
 777         /* DBGDCCINT */
 778         { Op1( 0), CRn( 0), CRm( 2), Op2( 0), trap_debug32 },
 779         /* DBGDSCRext */
 780         { Op1( 0), CRn( 0), CRm( 2), Op2( 2), trap_debug32 },
 781         DBG_BCR_BVR_WCR_WVR(2),
 782         /* DBGDTR[RT]Xint */
 783         { Op1( 0), CRn( 0), CRm( 3), Op2( 0), trap_raz_wi },
 784         /* DBGDTR[RT]Xext */
 785         { Op1( 0), CRn( 0), CRm( 3), Op2( 2), trap_raz_wi },
 786         DBG_BCR_BVR_WCR_WVR(3),
 787         DBG_BCR_BVR_WCR_WVR(4),
 788         DBG_BCR_BVR_WCR_WVR(5),
 789         /* DBGWFAR */
 790         { Op1( 0), CRn( 0), CRm( 6), Op2( 0), trap_raz_wi },
 791         /* DBGOSECCR */
 792         { Op1( 0), CRn( 0), CRm( 6), Op2( 2), trap_raz_wi },
 793         DBG_BCR_BVR_WCR_WVR(6),
 794         /* DBGVCR */
 795         { Op1( 0), CRn( 0), CRm( 7), Op2( 0), trap_debug32 },
 796         DBG_BCR_BVR_WCR_WVR(7),
 797         DBG_BCR_BVR_WCR_WVR(8),
 798         DBG_BCR_BVR_WCR_WVR(9),
 799         DBG_BCR_BVR_WCR_WVR(10),
 800         DBG_BCR_BVR_WCR_WVR(11),
 801         DBG_BCR_BVR_WCR_WVR(12),
 802         DBG_BCR_BVR_WCR_WVR(13),
 803         DBG_BCR_BVR_WCR_WVR(14),
 804         DBG_BCR_BVR_WCR_WVR(15),
 805
 806         /* DBGDRAR (32bit) */
 807         { Op1( 0), CRn( 1), CRm( 0), Op2( 0), trap_raz_wi },
 808
 809         DBGBXVR(0),
 810         /* DBGOSLAR */
 811         { Op1( 0), CRn( 1), CRm( 0), Op2( 4), trap_raz_wi },
 812         DBGBXVR(1),
 813         /* DBGOSLSR */
 814         { Op1( 0), CRn( 1), CRm( 1), Op2( 4), trap_oslsr_el1 },
 815         DBGBXVR(2),
 816         DBGBXVR(3),
 817         /* DBGOSDLR */
 818         { Op1( 0), CRn( 1), CRm( 3), Op2( 4), trap_raz_wi },
 819         DBGBXVR(4),
 820         /* DBGPRCR */
 821         { Op1( 0), CRn( 1), CRm( 4), Op2( 4), trap_raz_wi },
 822         DBGBXVR(5),
 823         DBGBXVR(6),
 824         DBGBXVR(7),
 825         DBGBXVR(8),
 826         DBGBXVR(9),
 827         DBGBXVR(10),
 828         DBGBXVR(11),
 829         DBGBXVR(12),
 830         DBGBXVR(13),
 831         DBGBXVR(14),
 832         DBGBXVR(15),
 833
 834         /* DBGDSAR (32bit) */
 835         { Op1( 0), CRn( 2), CRm( 0), Op2( 0), trap_raz_wi },
 836
 837         /* DBGDEVID2 */
 838         { Op1( 0), CRn( 7), CRm( 0), Op2( 7), trap_raz_wi },
 839         /* DBGDEVID1 */
 840         { Op1( 0), CRn( 7), CRm( 1), Op2( 7), trap_raz_wi },
 841         /* DBGDEVID */
 842         { Op1( 0), CRn( 7), CRm( 2), Op2( 7), trap_raz_wi },
 843         /* DBGCLAIMSET */
 844         { Op1( 0), CRn( 7), CRm( 8), Op2( 6), trap_raz_wi },
 845         /* DBGCLAIMCLR */
 846         { Op1( 0), CRn( 7), CRm( 9), Op2( 6), trap_raz_wi },
 847         /* DBGAUTHSTATUS */
 848         { Op1( 0), CRn( 7), CRm(14), Op2( 6), trap_dbgauthstatus_el1 },
 849 };
 850
 851 /* Trapped cp14 64bit registers */
 852 static const struct sys_reg_desc cp14_64_regs[] = {
 853         /* DBGDRAR (64bit) */
 854         { Op1( 0), CRm( 1), .access = trap_raz_wi },
 855
 856         /* DBGDSAR (64bit) */
 857         { Op1( 0), CRm( 2), .access = trap_raz_wi },
 858 };
 859
 860 /*
 861  * Trapped cp15 registers. TTBR0/TTBR1 get a double encoding,
 862  * depending on the way they are accessed (as a 32bit or a 64bit
 863  * register).
 864  */
 865 static const struct sys_reg_desc cp15_regs[] = {
 866         { Op1( 0), CRn( 0), CRm(12), Op2( 0), access_gic_sgi },
 867
 868         { Op1( 0), CRn( 1), CRm( 0), Op2( 0), access_vm_reg, NULL, c1_SCTLR },
 869         { Op1( 0), CRn( 2), CRm( 0), Op2( 0), access_vm_reg, NULL, c2_TTBR0 },
 870         { Op1( 0), CRn( 2), CRm( 0), Op2( 1), access_vm_reg, NULL, c2_TTBR1 },
 871         { Op1( 0), CRn( 2), CRm( 0), Op2( 2), access_vm_reg, NULL, c2_TTBCR },
 872         { Op1( 0), CRn( 3), CRm( 0), Op2( 0), access_vm_reg, NULL, c3_DACR },
 873         { Op1( 0), CRn( 5), CRm( 0), Op2( 0), access_vm_reg, NULL, c5_DFSR },
 874         { Op1( 0), CRn( 5), CRm( 0), Op2( 1), access_vm_reg, NULL, c5_IFSR },
 875         { Op1( 0), CRn( 5), CRm( 1), Op2( 0), access_vm_reg, NULL, c5_ADFSR },
 876         { Op1( 0), CRn( 5), CRm( 1), Op2( 1), access_vm_reg, NULL, c5_AIFSR },
 877         { Op1( 0), CRn( 6), CRm( 0), Op2( 0), access_vm_reg, NULL, c6_DFAR },
 878         { Op1( 0), CRn( 6), CRm( 0), Op2( 2), access_vm_reg, NULL, c6_IFAR },
 879
 880         /*
 881          * DC{C,I,CI}SW operations:
 882          */
 883         { Op1( 0), CRn( 7), CRm( 6), Op2( 2), access_dcsw },
 884         { Op1( 0), CRn( 7), CRm(10), Op2( 2), access_dcsw },
 885         { Op1( 0), CRn( 7), CRm(14), Op2( 2), access_dcsw },
 886
 887         /* PMU */
 888         { Op1( 0), CRn( 9), CRm(12), Op2( 0), trap_raz_wi },
 889         { Op1( 0), CRn( 9), CRm(12), Op2( 1), trap_raz_wi },
 890         { Op1( 0), CRn( 9), CRm(12), Op2( 2), trap_raz_wi },
 891         { Op1( 0), CRn( 9), CRm(12), Op2( 3), trap_raz_wi },
 892         { Op1( 0), CRn( 9), CRm(12), Op2( 5), trap_raz_wi },
 893         { Op1( 0), CRn( 9), CRm(12), Op2( 6), trap_raz_wi },
 894         { Op1( 0), CRn( 9), CRm(12), Op2( 7), trap_raz_wi },
 895         { Op1( 0), CRn( 9), CRm(13), Op2( 0), trap_raz_wi },
 896         { Op1( 0), CRn( 9), CRm(13), Op2( 1), trap_raz_wi },
 897         { Op1( 0), CRn( 9), CRm(13), Op2( 2), trap_raz_wi },
 898         { Op1( 0), CRn( 9), CRm(14), Op2( 0), trap_raz_wi },
 899         { Op1( 0), CRn( 9), CRm(14), Op2( 1), trap_raz_wi },
 900         { Op1( 0), CRn( 9), CRm(14), Op2( 2), trap_raz_wi },
 901
 902         { Op1( 0), CRn(10), CRm( 2), Op2( 0), access_vm_reg, NULL, c10_PRRR },
 903         { Op1( 0), CRn(10), CRm( 2), Op2( 1), access_vm_reg, NULL, c10_NMRR },
 904         { Op1( 0), CRn(10), CRm( 3), Op2( 0), access_vm_reg, NULL, c10_AMAIR0 },
 905         { Op1( 0), CRn(10), CRm( 3), Op2( 1), access_vm_reg, NULL, c10_AMAIR1 },
 906
 907         /* ICC_SRE */
 908         { Op1( 0), CRn(12), CRm(12), Op2( 5), trap_raz_wi },
 909
 910         { Op1( 0), CRn(13), CRm( 0), Op2( 1), access_vm_reg, NULL, c13_CID },
 911 };
 912
 913 static const struct sys_reg_desc cp15_64_regs[] = {
 914         { Op1( 0), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, c2_TTBR0 },
 915         { Op1( 0), CRn( 0), CRm(12), Op2( 0), access_gic_sgi },
 916         { Op1( 1), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, c2_TTBR1 },
 917 };
 918
 919 /* Target specific emulation tables */
 920 static struct kvm_sys_reg_target_table *target_tables[KVM_ARM_NUM_TARGETS];
 921
 922 void kvm_register_target_sys_reg_table(unsigned int target,
 923                                        struct kvm_sys_reg_target_table *table)
 924 {
 925         target_tables[target] = table;
 926 }
 927
 928 /* Get specific register table for this target. */
 929 static const struct sys_reg_desc *get_target_table(unsigned target,
 930                                                    bool mode_is_64,
 931                                                    size_t *num)
 932 {
 933         struct kvm_sys_reg_target_table *table;
 934
 935         table = target_tables[target];
 936         if (mode_is_64) {
 937                 *num = table->table64.num;
 938                 return table->table64.table;
 939         } else {
 940                 *num = table->table32.num;
 941                 return table->table32.table;
 942         }
 943 }
 944
 945 static const struct sys_reg_desc *find_reg(const struct sys_reg_params *params,
 946                                          const struct sys_reg_desc table[],
 947                                          unsigned int num)
 948 {
 949         unsigned int i;
 950
 951         for (i = 0; i < num; i++) {
 952                 const struct sys_reg_desc *r = &table[i];
 953
 954                 if (params->Op0 != r->Op0)
 955                         continue;
 956                 if (params->Op1 != r->Op1)
 957                         continue;
 958                 if (params->CRn != r->CRn)
 959                         continue;
 960                 if (params->CRm != r->CRm)
 961                         continue;
 962                 if (params->Op2 != r->Op2)
 963                         continue;
 964
 965                 return r;
 966         }
 967         return NULL;
 968 }
 969
 970 int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu, struct kvm_run *run)
 971 {
 972         kvm_inject_undefined(vcpu);
 973         return 1;
 974 }
 975
 976 /*
 977  * emulate_cp --  tries to match a sys_reg access in a handling table, and
 978  *                call the corresponding trap handler.
 979  *
 980  * @params: pointer to the descriptor of the access
 981  * @table: array of trap descriptors
 982  * @num: size of the trap descriptor array
 983  *
 984  * Return 0 if the access has been handled, and -1 if not.
 985  */
 986 static int emulate_cp(struct kvm_vcpu *vcpu,
 987                       struct sys_reg_params *params,
 988                       const struct sys_reg_desc *table,
 989                       size_t num)
 990 {
 991         const struct sys_reg_desc *r;
 992
 993         if (!table)
 994                 return -1;      /* Not handled */
 995
 996         r = find_reg(params, table, num);
 997
 998         if (r) {
 999                 /*
1000                  * Not having an accessor means that we have
1001                  * configured a trap that we don't know how to
1002                  * handle. This certainly qualifies as a gross bug
1003                  * that should be fixed right away.
1004                  */
1005                 BUG_ON(!r->access);
1006
1007                 if (likely(r->access(vcpu, params, r))) {
1008                         /* Skip instruction, since it was emulated */
1009                         kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
1010                         /* Handled */
1011                         return 0;
1012                 }
1013         }
1014
1015         /* Not handled */
1016         return -1;
1017 }
1018
1019 static void unhandled_cp_access(struct kvm_vcpu *vcpu,
1020                                 struct sys_reg_params *params)
1021 {
1022         u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu);
1023         int cp;
1024
1025         switch(hsr_ec) {
1026         case ESR_ELx_EC_CP15_32:
1027         case ESR_ELx_EC_CP15_64:
1028                 cp = 15;
1029                 break;
1030         case ESR_ELx_EC_CP14_MR:
1031         case ESR_ELx_EC_CP14_64:
1032                 cp = 14;
1033                 break;
1034         default:
1035                 WARN_ON((cp = -1));
1036         }
1037
1038         kvm_err("Unsupported guest CP%d access at: %08lx\n",
1039                 cp, *vcpu_pc(vcpu));
1040         print_sys_reg_instr(params);
1041         kvm_inject_undefined(vcpu);
1042 }
1043
1044 /**
1045  * kvm_handle_cp_64 -- handles a mrrc/mcrr trap on a guest CP14/CP15 access
1046  * @vcpu: The VCPU pointer
1047  * @run:  The kvm_run struct
1048  */
1049 static int kvm_handle_cp_64(struct kvm_vcpu *vcpu,
1050                             const struct sys_reg_desc *global,
1051                             size_t nr_global,
1052                             const struct sys_reg_desc *target_specific,
1053                             size_t nr_specific)
1054 {
1055         struct sys_reg_params params;
1056         u32 hsr = kvm_vcpu_get_hsr(vcpu);
1057         int Rt = (hsr >> 5) & 0xf;
1058         int Rt2 = (hsr >> 10) & 0xf;
1059
1060         params.is_aarch32 = true;
1061         params.is_32bit = false;
1062         params.CRm = (hsr >> 1) & 0xf;
1063         params.is_write = ((hsr & 1) == 0);
1064
1065         params.Op0 = 0;
1066         params.Op1 = (hsr >> 16) & 0xf;
1067         params.Op2 = 0;
1068         params.CRn = 0;
1069
1070         /*
1071          * Make a 64-bit value out of Rt and Rt2. As we use the same trap
1072          * backends between AArch32 and AArch64, we get away with it.
1073          */
1074         if (params.is_write) {
1075                 params.regval = vcpu_get_reg(vcpu, Rt) & 0xffffffff;
1076                 params.regval |= vcpu_get_reg(vcpu, Rt2) << 32;
1077         }
1078
1079         if (!emulate_cp(vcpu, &params, target_specific, nr_specific))
1080                 goto out;
1081         if (!emulate_cp(vcpu, &params, global, nr_global))
1082                 goto out;
1083
1084         unhandled_cp_access(vcpu, &params);
1085
1086 out:
1087         /* Split up the value between registers for the read side */
1088         if (!params.is_write) {
1089                 vcpu_set_reg(vcpu, Rt, lower_32_bits(params.regval));
1090                 vcpu_set_reg(vcpu, Rt2, upper_32_bits(params.regval));
1091         }
1092
1093         return 1;
1094 }
1095
1096 /**
1097  * kvm_handle_cp_32 -- handles a mrc/mcr trap on a guest CP14/CP15 access
1098  * @vcpu: The VCPU pointer
1099  * @run:  The kvm_run struct
1100  */
1101 static int kvm_handle_cp_32(struct kvm_vcpu *vcpu,
1102                             const struct sys_reg_desc *global,
1103                             size_t nr_global,
1104                             const struct sys_reg_desc *target_specific,
1105                             size_t nr_specific)
1106 {
1107         struct sys_reg_params params;
1108         u32 hsr = kvm_vcpu_get_hsr(vcpu);
1109         int Rt  = (hsr >> 5) & 0xf;
1110
1111         params.is_aarch32 = true;
1112         params.is_32bit = true;
1113         params.CRm = (hsr >> 1) & 0xf;
1114         params.regval = vcpu_get_reg(vcpu, Rt);
1115         params.is_write = ((hsr & 1) == 0);
1116         params.CRn = (hsr >> 10) & 0xf;
1117         params.Op0 = 0;
1118         params.Op1 = (hsr >> 14) & 0x7;
1119         params.Op2 = (hsr >> 17) & 0x7;
1120
1121         if (!emulate_cp(vcpu, &params, target_specific, nr_specific) ||
1122             !emulate_cp(vcpu, &params, global, nr_global)) {
1123                 if (!params.is_write)
1124                         vcpu_set_reg(vcpu, Rt, params.regval);
1125                 return 1;
1126         }
1127
1128         unhandled_cp_access(vcpu, &params);
1129         return 1;
1130 }
1131
1132 int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run)
1133 {
1134         const struct sys_reg_desc *target_specific;
1135         size_t num;
1136
1137         target_specific = get_target_table(vcpu->arch.target, false, &num);
1138         return kvm_handle_cp_64(vcpu,
1139                                 cp15_64_regs, ARRAY_SIZE(cp15_64_regs),
1140                                 target_specific, num);
1141 }
1142
1143 int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run)
1144 {
1145         const struct sys_reg_desc *target_specific;
1146         size_t num;
1147
1148         target_specific = get_target_table(vcpu->arch.target, false, &num);
1149         return kvm_handle_cp_32(vcpu,
1150                                 cp15_regs, ARRAY_SIZE(cp15_regs),
1151                                 target_specific, num);
1152 }
1153
1154 int kvm_handle_cp14_64(struct kvm_vcpu *vcpu, struct kvm_run *run)
1155 {
1156         return kvm_handle_cp_64(vcpu,
1157                                 cp14_64_regs, ARRAY_SIZE(cp14_64_regs),
1158                                 NULL, 0);
1159 }
1160
1161 int kvm_handle_cp14_32(struct kvm_vcpu *vcpu, struct kvm_run *run)
1162 {
1163         return kvm_handle_cp_32(vcpu,
1164                                 cp14_regs, ARRAY_SIZE(cp14_regs),
1165                                 NULL, 0);
1166 }
1167
1168 static int emulate_sys_reg(struct kvm_vcpu *vcpu,
1169                            struct sys_reg_params *params)
1170 {
1171         size_t num;
1172         const struct sys_reg_desc *table, *r;
1173
1174         table = get_target_table(vcpu->arch.target, true, &num);
1175
1176         /* Search target-specific then generic table. */
1177         r = find_reg(params, table, num);
1178         if (!r)
1179                 r = find_reg(params, sys_reg_descs, ARRAY_SIZE(sys_reg_descs));
1180
1181         if (likely(r)) {
1182                 /*
1183                  * Not having an accessor means that we have
1184                  * configured a trap that we don't know how to
1185                  * handle. This certainly qualifies as a gross bug
1186                  * that should be fixed right away.
1187                  */
1188                 BUG_ON(!r->access);
1189
1190                 if (likely(r->access(vcpu, params, r))) {
1191                         /* Skip instruction, since it was emulated */
1192                         kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
1193                         return 1;
1194                 }
1195                 /* If access function fails, it should complain. */
1196         } else {
1197                 kvm_err("Unsupported guest sys_reg access at: %lx\n",
1198                         *vcpu_pc(vcpu));
1199                 print_sys_reg_instr(params);
1200         }
1201         kvm_inject_undefined(vcpu);
1202         return 1;
1203 }
1204
1205 static void reset_sys_reg_descs(struct kvm_vcpu *vcpu,
1206                               const struct sys_reg_desc *table, size_t num)
1207 {
1208         unsigned long i;
1209
1210         for (i = 0; i < num; i++)
1211                 if (table[i].reset)
1212                         table[i].reset(vcpu, &table[i]);
1213 }
1214
1215 /**
1216  * kvm_handle_sys_reg -- handles a mrs/msr trap on a guest sys_reg access
1217  * @vcpu: The VCPU pointer
1218  * @run:  The kvm_run struct
1219  */
1220 int kvm_handle_sys_reg(struct kvm_vcpu *vcpu, struct kvm_run *run)
1221 {
1222         struct sys_reg_params params;
1223         unsigned long esr = kvm_vcpu_get_hsr(vcpu);
1224         int Rt = (esr >> 5) & 0x1f;
1225         int ret;
1226
1227         trace_kvm_handle_sys_reg(esr);
1228
1229         params.is_aarch32 = false;
1230         params.is_32bit = false;
1231         params.Op0 = (esr >> 20) & 3;
1232         params.Op1 = (esr >> 14) & 0x7;
1233         params.CRn = (esr >> 10) & 0xf;
1234         params.CRm = (esr >> 1) & 0xf;
1235         params.Op2 = (esr >> 17) & 0x7;
1236         params.regval = vcpu_get_reg(vcpu, Rt);
1237         params.is_write = !(esr & 1);
1238
1239         ret = emulate_sys_reg(vcpu, &params);
1240
1241         if (!params.is_write)
1242                 vcpu_set_reg(vcpu, Rt, params.regval);
1243         return ret;
1244 }
1245
1246 /******************************************************************************
1247  * Userspace API
1248  *****************************************************************************/
1249
1250 static bool index_to_params(u64 id, struct sys_reg_params *params)
1251 {
1252         switch (id & KVM_REG_SIZE_MASK) {
1253         case KVM_REG_SIZE_U64:
1254                 /* Any unused index bits means it's not valid. */
1255                 if (id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK
1256                               | KVM_REG_ARM_COPROC_MASK
1257                               | KVM_REG_ARM64_SYSREG_OP0_MASK
1258                               | KVM_REG_ARM64_SYSREG_OP1_MASK
1259                               | KVM_REG_ARM64_SYSREG_CRN_MASK
1260                               | KVM_REG_ARM64_SYSREG_CRM_MASK
1261                               | KVM_REG_ARM64_SYSREG_OP2_MASK))
1262                         return false;
1263                 params->Op0 = ((id & KVM_REG_ARM64_SYSREG_OP0_MASK)
1264                                >> KVM_REG_ARM64_SYSREG_OP0_SHIFT);
1265                 params->Op1 = ((id & KVM_REG_ARM64_SYSREG_OP1_MASK)
1266                                >> KVM_REG_ARM64_SYSREG_OP1_SHIFT);
1267                 params->CRn = ((id & KVM_REG_ARM64_SYSREG_CRN_MASK)
1268                                >> KVM_REG_ARM64_SYSREG_CRN_SHIFT);
1269                 params->CRm = ((id & KVM_REG_ARM64_SYSREG_CRM_MASK)
1270                                >> KVM_REG_ARM64_SYSREG_CRM_SHIFT);
1271                 params->Op2 = ((id & KVM_REG_ARM64_SYSREG_OP2_MASK)
1272                                >> KVM_REG_ARM64_SYSREG_OP2_SHIFT);
1273                 return true;
1274         default:
1275                 return false;
1276         }
1277 }
1278
1279 /* Decode an index value, and find the sys_reg_desc entry. */
1280 static const struct sys_reg_desc *index_to_sys_reg_desc(struct kvm_vcpu *vcpu,
1281                                                     u64 id)
1282 {
1283         size_t num;
1284         const struct sys_reg_desc *table, *r;
1285         struct sys_reg_params params;
1286
1287         /* We only do sys_reg for now. */
1288         if ((id & KVM_REG_ARM_COPROC_MASK) != KVM_REG_ARM64_SYSREG)
1289                 return NULL;
1290
1291         if (!index_to_params(id, &params))
1292                 return NULL;
1293
1294         table = get_target_table(vcpu->arch.target, true, &num);
1295         r = find_reg(&params, table, num);
1296         if (!r)
1297                 r = find_reg(&params, sys_reg_descs, ARRAY_SIZE(sys_reg_descs));
1298
1299         /* Not saved in the sys_reg array? */
1300         if (r && !r->reg)
1301                 r = NULL;
1302
1303         return r;
1304 }
1305
1306 /*
1307  * These are the invariant sys_reg registers: we let the guest see the
1308  * host versions of these, so they're part of the guest state.
1309  *
1310  * A future CPU may provide a mechanism to present different values to
1311  * the guest, or a future kvm may trap them.
1312  */
1313
1314 #define FUNCTION_INVARIANT(reg)                                         \
1315         static void get_##reg(struct kvm_vcpu *v,                       \
1316                               const struct sys_reg_desc *r)             \
1317         {                                                               \
1318                 u64 val;                                                \
1319                                                                         \
1320                 asm volatile("mrs %0, " __stringify(reg) "\n"           \
1321                              : "=r" (val));                             \
1322                 ((struct sys_reg_desc *)r)->val = val;                  \
1323         }
1324
1325 FUNCTION_INVARIANT(midr_el1)
1326 FUNCTION_INVARIANT(ctr_el0)
1327 FUNCTION_INVARIANT(revidr_el1)
1328 FUNCTION_INVARIANT(id_pfr0_el1)
1329 FUNCTION_INVARIANT(id_pfr1_el1)
1330 FUNCTION_INVARIANT(id_dfr0_el1)
1331 FUNCTION_INVARIANT(id_afr0_el1)
1332 FUNCTION_INVARIANT(id_mmfr0_el1)
1333 FUNCTION_INVARIANT(id_mmfr1_el1)
1334 FUNCTION_INVARIANT(id_mmfr2_el1)
1335 FUNCTION_INVARIANT(id_mmfr3_el1)
1336 FUNCTION_INVARIANT(id_isar0_el1)
1337 FUNCTION_INVARIANT(id_isar1_el1)
1338 FUNCTION_INVARIANT(id_isar2_el1)
1339 FUNCTION_INVARIANT(id_isar3_el1)
1340 FUNCTION_INVARIANT(id_isar4_el1)
1341 FUNCTION_INVARIANT(id_isar5_el1)
1342 FUNCTION_INVARIANT(clidr_el1)
1343 FUNCTION_INVARIANT(aidr_el1)
1344
1345 /* ->val is filled in by kvm_sys_reg_table_init() */
1346 static struct sys_reg_desc invariant_sys_regs[] = {
1347         { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0000), Op2(0b000),
1348           NULL, get_midr_el1 },
1349         { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0000), Op2(0b110),
1350           NULL, get_revidr_el1 },
1351         { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b000),
1352           NULL, get_id_pfr0_el1 },
1353         { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b001),
1354           NULL, get_id_pfr1_el1 },
1355         { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b010),
1356           NULL, get_id_dfr0_el1 },
1357         { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b011),
1358           NULL, get_id_afr0_el1 },
1359         { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b100),
1360           NULL, get_id_mmfr0_el1 },
1361         { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b101),
1362           NULL, get_id_mmfr1_el1 },
1363         { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b110),
1364           NULL, get_id_mmfr2_el1 },
1365         { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b111),
1366           NULL, get_id_mmfr3_el1 },
1367         { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b000),
1368           NULL, get_id_isar0_el1 },
1369         { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b001),
1370           NULL, get_id_isar1_el1 },
1371         { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b010),
1372           NULL, get_id_isar2_el1 },
1373         { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b011),
1374           NULL, get_id_isar3_el1 },
1375         { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b100),
1376           NULL, get_id_isar4_el1 },
1377         { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b101),
1378           NULL, get_id_isar5_el1 },
1379         { Op0(0b11), Op1(0b001), CRn(0b0000), CRm(0b0000), Op2(0b001),
1380           NULL, get_clidr_el1 },
1381         { Op0(0b11), Op1(0b001), CRn(0b0000), CRm(0b0000), Op2(0b111),
1382           NULL, get_aidr_el1 },
1383         { Op0(0b11), Op1(0b011), CRn(0b0000), CRm(0b0000), Op2(0b001),
1384           NULL, get_ctr_el0 },
1385 };
1386
1387 static int reg_from_user(u64 *val, const void __user *uaddr, u64 id)
1388 {
1389         if (copy_from_user(val, uaddr, KVM_REG_SIZE(id)) != 0)
1390                 return -EFAULT;
1391         return 0;
1392 }
1393
1394 static int reg_to_user(void __user *uaddr, const u64 *val, u64 id)
1395 {
1396         if (copy_to_user(uaddr, val, KVM_REG_SIZE(id)) != 0)
1397                 return -EFAULT;
1398         return 0;
1399 }
1400
1401 static int get_invariant_sys_reg(u64 id, void __user *uaddr)
1402 {
1403         struct sys_reg_params params;
1404         const struct sys_reg_desc *r;
1405
1406         if (!index_to_params(id, &params))
1407                 return -ENOENT;
1408
1409         r = find_reg(&params, invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs));
1410         if (!r)
1411                 return -ENOENT;
1412
1413         return reg_to_user(uaddr, &r->val, id);
1414 }
1415
1416 static int set_invariant_sys_reg(u64 id, void __user *uaddr)
1417 {
1418         struct sys_reg_params params;
1419         const struct sys_reg_desc *r;
1420         int err;
1421         u64 val = 0; /* Make sure high bits are 0 for 32-bit regs */
1422
1423         if (!index_to_params(id, &params))
1424                 return -ENOENT;
1425         r = find_reg(&params, invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs));
1426         if (!r)
1427                 return -ENOENT;
1428
1429         err = reg_from_user(&val, uaddr, id);
1430         if (err)
1431                 return err;
1432
1433         /* This is what we mean by invariant: you can't change it. */
1434         if (r->val != val)
1435                 return -EINVAL;
1436
1437         return 0;
1438 }
1439
1440 static bool is_valid_cache(u32 val)
1441 {
1442         u32 level, ctype;
1443
1444         if (val >= CSSELR_MAX)
1445                 return false;
1446
1447         /* Bottom bit is Instruction or Data bit.  Next 3 bits are level. */
1448         level = (val >> 1);
1449         ctype = (cache_levels >> (level * 3)) & 7;
1450
1451         switch (ctype) {
1452         case 0: /* No cache */
1453                 return false;
1454         case 1: /* Instruction cache only */
1455                 return (val & 1);
1456         case 2: /* Data cache only */
1457         case 4: /* Unified cache */
1458                 return !(val & 1);
1459         case 3: /* Separate instruction and data caches */
1460                 return true;
1461         default: /* Reserved: we can't know instruction or data. */
1462                 return false;
1463         }
1464 }
1465
1466 static int demux_c15_get(u64 id, void __user *uaddr)
1467 {
1468         u32 val;
1469         u32 __user *uval = uaddr;
1470
1471         /* Fail if we have unknown bits set. */
1472         if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK
1473                    | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1)))
1474                 return -ENOENT;
1475
1476         switch (id & KVM_REG_ARM_DEMUX_ID_MASK) {
1477         case KVM_REG_ARM_DEMUX_ID_CCSIDR:
1478                 if (KVM_REG_SIZE(id) != 4)
1479                         return -ENOENT;
1480                 val = (id & KVM_REG_ARM_DEMUX_VAL_MASK)
1481                         >> KVM_REG_ARM_DEMUX_VAL_SHIFT;
1482                 if (!is_valid_cache(val))
1483                         return -ENOENT;
1484
1485                 return put_user(get_ccsidr(val), uval);
1486         default:
1487                 return -ENOENT;
1488         }
1489 }
1490
1491 static int demux_c15_set(u64 id, void __user *uaddr)
1492 {
1493         u32 val, newval;
1494         u32 __user *uval = uaddr;
1495
1496         /* Fail if we have unknown bits set. */
1497         if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK
1498                    | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1)))
1499                 return -ENOENT;
1500
1501         switch (id & KVM_REG_ARM_DEMUX_ID_MASK) {
1502         case KVM_REG_ARM_DEMUX_ID_CCSIDR:
1503                 if (KVM_REG_SIZE(id) != 4)
1504                         return -ENOENT;
1505                 val = (id & KVM_REG_ARM_DEMUX_VAL_MASK)
1506                         >> KVM_REG_ARM_DEMUX_VAL_SHIFT;
1507                 if (!is_valid_cache(val))
1508                         return -ENOENT;
1509
1510                 if (get_user(newval, uval))
1511                         return -EFAULT;
1512
1513                 /* This is also invariant: you can't change it. */
1514                 if (newval != get_ccsidr(val))
1515                         return -EINVAL;
1516                 return 0;
1517         default:
1518                 return -ENOENT;
1519         }
1520 }
1521
1522 int kvm_arm_sys_reg_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
1523 {
1524         const struct sys_reg_desc *r;
1525         void __user *uaddr = (void __user *)(unsigned long)reg->addr;
1526
1527         if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX)
1528                 return demux_c15_get(reg->id, uaddr);
1529
1530         if (KVM_REG_SIZE(reg->id) != sizeof(__u64))
1531                 return -ENOENT;
1532
1533         r = index_to_sys_reg_desc(vcpu, reg->id);
1534         if (!r)
1535                 return get_invariant_sys_reg(reg->id, uaddr);
1536
1537         if (r->get_user)
1538                 return (r->get_user)(vcpu, r, reg, uaddr);
1539
1540         return reg_to_user(uaddr, &vcpu_sys_reg(vcpu, r->reg), reg->id);
1541 }
1542
1543 int kvm_arm_sys_reg_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
1544 {
1545         const struct sys_reg_desc *r;
1546         void __user *uaddr = (void __user *)(unsigned long)reg->addr;
1547
1548         if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX)
1549                 return demux_c15_set(reg->id, uaddr);
1550
1551         if (KVM_REG_SIZE(reg->id) != sizeof(__u64))
1552                 return -ENOENT;
1553
1554         r = index_to_sys_reg_desc(vcpu, reg->id);
1555         if (!r)
1556                 return set_invariant_sys_reg(reg->id, uaddr);
1557
1558         if (r->set_user)
1559                 return (r->set_user)(vcpu, r, reg, uaddr);
1560
1561         return reg_from_user(&vcpu_sys_reg(vcpu, r->reg), uaddr, reg->id);
1562 }
1563
1564 static unsigned int num_demux_regs(void)
1565 {
1566         unsigned int i, count = 0;
1567
1568         for (i = 0; i < CSSELR_MAX; i++)
1569                 if (is_valid_cache(i))
1570                         count++;
1571
1572         return count;
1573 }
1574
1575 static int write_demux_regids(u64 __user *uindices)
1576 {
1577         u64 val = KVM_REG_ARM64 | KVM_REG_SIZE_U32 | KVM_REG_ARM_DEMUX;
1578         unsigned int i;
1579
1580         val |= KVM_REG_ARM_DEMUX_ID_CCSIDR;
1581         for (i = 0; i < CSSELR_MAX; i++) {
1582                 if (!is_valid_cache(i))
1583                         continue;
1584                 if (put_user(val | i, uindices))
1585                         return -EFAULT;
1586                 uindices++;
1587         }
1588         return 0;
1589 }
1590
1591 static u64 sys_reg_to_index(const struct sys_reg_desc *reg)
1592 {
1593         return (KVM_REG_ARM64 | KVM_REG_SIZE_U64 |
1594                 KVM_REG_ARM64_SYSREG |
1595                 (reg->Op0 << KVM_REG_ARM64_SYSREG_OP0_SHIFT) |
1596                 (reg->Op1 << KVM_REG_ARM64_SYSREG_OP1_SHIFT) |
1597                 (reg->CRn << KVM_REG_ARM64_SYSREG_CRN_SHIFT) |
1598                 (reg->CRm << KVM_REG_ARM64_SYSREG_CRM_SHIFT) |
1599                 (reg->Op2 << KVM_REG_ARM64_SYSREG_OP2_SHIFT));
1600 }
1601
1602 static bool copy_reg_to_user(const struct sys_reg_desc *reg, u64 __user **uind)
1603 {
1604         if (!*uind)
1605                 return true;
1606
1607         if (put_user(sys_reg_to_index(reg), *uind))
1608                 return false;
1609
1610         (*uind)++;
1611         return true;
1612 }
1613
1614 /* Assumed ordered tables, see kvm_sys_reg_table_init. */
1615 static int walk_sys_regs(struct kvm_vcpu *vcpu, u64 __user *uind)
1616 {
1617         const struct sys_reg_desc *i1, *i2, *end1, *end2;
1618         unsigned int total = 0;
1619         size_t num;
1620
1621         /* We check for duplicates here, to allow arch-specific overrides. */
1622         i1 = get_target_table(vcpu->arch.target, true, &num);
1623         end1 = i1 + num;
1624         i2 = sys_reg_descs;
1625         end2 = sys_reg_descs + ARRAY_SIZE(sys_reg_descs);
1626
1627         BUG_ON(i1 == end1 || i2 == end2);
1628
1629         /* Walk carefully, as both tables may refer to the same register. */
1630         while (i1 || i2) {
1631                 int cmp = cmp_sys_reg(i1, i2);
1632                 /* target-specific overrides generic entry. */
1633                 if (cmp <= 0) {
1634                         /* Ignore registers we trap but don't save. */
1635                         if (i1->reg) {
1636                                 if (!copy_reg_to_user(i1, &uind))
1637                                         return -EFAULT;
1638                                 total++;
1639                         }
1640                 } else {
1641                         /* Ignore registers we trap but don't save. */
1642                         if (i2->reg) {
1643                                 if (!copy_reg_to_user(i2, &uind))
1644                                         return -EFAULT;
1645                                 total++;
1646                         }
1647                 }
1648
1649                 if (cmp <= 0 && ++i1 == end1)
1650                         i1 = NULL;
1651                 if (cmp >= 0 && ++i2 == end2)
1652                         i2 = NULL;
1653         }
1654         return total;
1655 }
1656
1657 unsigned long kvm_arm_num_sys_reg_descs(struct kvm_vcpu *vcpu)
1658 {
1659         return ARRAY_SIZE(invariant_sys_regs)
1660                 + num_demux_regs()
1661                 + walk_sys_regs(vcpu, (u64 __user *)NULL);
1662 }
1663
1664 int kvm_arm_copy_sys_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
1665 {
1666         unsigned int i;
1667         int err;
1668
1669         /* Then give them all the invariant registers' indices. */
1670         for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++) {
1671                 if (put_user(sys_reg_to_index(&invariant_sys_regs[i]), uindices))
1672                         return -EFAULT;
1673                 uindices++;
1674         }
1675
1676         err = walk_sys_regs(vcpu, uindices);
1677         if (err < 0)
1678                 return err;
1679         uindices += err;
1680
1681         return write_demux_regids(uindices);
1682 }
1683
1684 static int check_sysreg_table(const struct sys_reg_desc *table, unsigned int n)
1685 {
1686         unsigned int i;
1687
1688         for (i = 1; i < n; i++) {
1689                 if (cmp_sys_reg(&table[i-1], &table[i]) >= 0) {
1690                         kvm_err("sys_reg table %p out of order (%d)\n", table, i - 1);
1691                         return 1;
1692                 }
1693         }
1694
1695         return 0;
1696 }
1697
1698 void kvm_sys_reg_table_init(void)
1699 {
1700         unsigned int i;
1701         struct sys_reg_desc clidr;
1702
1703         /* Make sure tables are unique and in order. */
1704         BUG_ON(check_sysreg_table(sys_reg_descs, ARRAY_SIZE(sys_reg_descs)));
1705         BUG_ON(check_sysreg_table(cp14_regs, ARRAY_SIZE(cp14_regs)));
1706         BUG_ON(check_sysreg_table(cp14_64_regs, ARRAY_SIZE(cp14_64_regs)));
1707         BUG_ON(check_sysreg_table(cp15_regs, ARRAY_SIZE(cp15_regs)));
1708         BUG_ON(check_sysreg_table(cp15_64_regs, ARRAY_SIZE(cp15_64_regs)));
1709         BUG_ON(check_sysreg_table(invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs)));
1710
1711         /* We abuse the reset function to overwrite the table itself. */
1712         for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++)
1713                 invariant_sys_regs[i].reset(NULL, &invariant_sys_regs[i]);
1714
1715         /*
1716          * CLIDR format is awkward, so clean it up.  See ARM B4.1.20:
1717          *
1718          *   If software reads the Cache Type fields from Ctype1
1719          *   upwards, once it has seen a value of 0b000, no caches
1720          *   exist at further-out levels of the hierarchy. So, for
1721          *   example, if Ctype3 is the first Cache Type field with a
1722          *   value of 0b000, the values of Ctype4 to Ctype7 must be
1723          *   ignored.
1724          */
1725         get_clidr_el1(NULL, &clidr); /* Ugly... */
1726         cache_levels = clidr.val;
1727         for (i = 0; i < 7; i++)
1728                 if (((cache_levels >> (i*3)) & 7) == 0)
1729                         break;
1730         /* Clear all higher bits. */
1731         cache_levels &= (1 << (i*3))-1;
1732 }
1733
1734 /**
1735  * kvm_reset_sys_regs - sets system registers to reset value
1736  * @vcpu: The VCPU pointer
1737  *
1738  * This function finds the right table above and sets the registers on the
1739  * virtual CPU struct to their architecturally defined reset values.
1740  */
1741 void kvm_reset_sys_regs(struct kvm_vcpu *vcpu)
1742 {
1743         size_t num;
1744         const struct sys_reg_desc *table;
1745
1746         /* Catch someone adding a register without putting in reset entry. */
1747         memset(&vcpu->arch.ctxt.sys_regs, 0x42, sizeof(vcpu->arch.ctxt.sys_regs));
1748
1749         /* Generic chip reset first (so target could override). */
1750         reset_sys_reg_descs(vcpu, sys_reg_descs, ARRAY_SIZE(sys_reg_descs));
1751
1752         table = get_target_table(vcpu->arch.target, true, &num);
1753         reset_sys_reg_descs(vcpu, table, num);
1754
1755         for (num = 1; num < NR_SYS_REGS; num++)
1756                 if (vcpu_sys_reg(vcpu, num) == 0x4242424242424242)
1757                         panic("Didn't reset vcpu_sys_reg(%zi)", num);
1758 }