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/bitfield.h> 13 #include <linux/bsearch.h> 14 #include <linux/cacheinfo.h> 15 #include <linux/kvm_host.h> 16 #include <linux/mm.h> 17 #include <linux/printk.h> 18 #include <linux/uaccess.h> 19 20 #include <asm/cacheflush.h> 21 #include <asm/cputype.h> 22 #include <asm/debug-monitors.h> 23 #include <asm/esr.h> 24 #include <asm/kvm_arm.h> 25 #include <asm/kvm_emulate.h> 26 #include <asm/kvm_hyp.h> 27 #include <asm/kvm_mmu.h> 28 #include <asm/kvm_nested.h> 29 #include <asm/perf_event.h> 30 #include <asm/sysreg.h> 31 32 #include <trace/events/kvm.h> 33 34 #include "sys_regs.h" 35 36 #include "trace.h" 37 38 /* 39 * For AArch32, we only take care of what is being trapped. Anything 40 * that has to do with init and userspace access has to go via the 41 * 64bit interface. 42 */ 43 44 static u64 sys_reg_to_index(const struct sys_reg_desc *reg); 45 static int set_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 46 u64 val); 47 48 static bool read_from_write_only(struct kvm_vcpu *vcpu, 49 struct sys_reg_params *params, 50 const struct sys_reg_desc *r) 51 { 52 WARN_ONCE(1, "Unexpected sys_reg read to write-only register\n"); 53 print_sys_reg_instr(params); 54 kvm_inject_undefined(vcpu); 55 return false; 56 } 57 58 static bool write_to_read_only(struct kvm_vcpu *vcpu, 59 struct sys_reg_params *params, 60 const struct sys_reg_desc *r) 61 { 62 WARN_ONCE(1, "Unexpected sys_reg write to read-only register\n"); 63 print_sys_reg_instr(params); 64 kvm_inject_undefined(vcpu); 65 return false; 66 } 67 68 u64 vcpu_read_sys_reg(const struct kvm_vcpu *vcpu, int reg) 69 { 70 u64 val = 0x8badf00d8badf00d; 71 72 if (vcpu_get_flag(vcpu, SYSREGS_ON_CPU) && 73 __vcpu_read_sys_reg_from_cpu(reg, &val)) 74 return val; 75 76 return __vcpu_sys_reg(vcpu, reg); 77 } 78 79 void vcpu_write_sys_reg(struct kvm_vcpu *vcpu, u64 val, int reg) 80 { 81 if (vcpu_get_flag(vcpu, SYSREGS_ON_CPU) && 82 __vcpu_write_sys_reg_to_cpu(val, reg)) 83 return; 84 85 __vcpu_sys_reg(vcpu, reg) = val; 86 } 87 88 /* CSSELR values; used to index KVM_REG_ARM_DEMUX_ID_CCSIDR */ 89 #define CSSELR_MAX 14 90 91 /* 92 * Returns the minimum line size for the selected cache, expressed as 93 * Log2(bytes). 94 */ 95 static u8 get_min_cache_line_size(bool icache) 96 { 97 u64 ctr = read_sanitised_ftr_reg(SYS_CTR_EL0); 98 u8 field; 99 100 if (icache) 101 field = SYS_FIELD_GET(CTR_EL0, IminLine, ctr); 102 else 103 field = SYS_FIELD_GET(CTR_EL0, DminLine, ctr); 104 105 /* 106 * Cache line size is represented as Log2(words) in CTR_EL0. 107 * Log2(bytes) can be derived with the following: 108 * 109 * Log2(words) + 2 = Log2(bytes / 4) + 2 110 * = Log2(bytes) - 2 + 2 111 * = Log2(bytes) 112 */ 113 return field + 2; 114 } 115 116 /* Which cache CCSIDR represents depends on CSSELR value. */ 117 static u32 get_ccsidr(struct kvm_vcpu *vcpu, u32 csselr) 118 { 119 u8 line_size; 120 121 if (vcpu->arch.ccsidr) 122 return vcpu->arch.ccsidr[csselr]; 123 124 line_size = get_min_cache_line_size(csselr & CSSELR_EL1_InD); 125 126 /* 127 * Fabricate a CCSIDR value as the overriding value does not exist. 128 * The real CCSIDR value will not be used as it can vary by the 129 * physical CPU which the vcpu currently resides in. 130 * 131 * The line size is determined with get_min_cache_line_size(), which 132 * should be valid for all CPUs even if they have different cache 133 * configuration. 134 * 135 * The associativity bits are cleared, meaning the geometry of all data 136 * and unified caches (which are guaranteed to be PIPT and thus 137 * non-aliasing) are 1 set and 1 way. 138 * Guests should not be doing cache operations by set/way at all, and 139 * for this reason, we trap them and attempt to infer the intent, so 140 * that we can flush the entire guest's address space at the appropriate 141 * time. The exposed geometry minimizes the number of the traps. 142 * [If guests should attempt to infer aliasing properties from the 143 * geometry (which is not permitted by the architecture), they would 144 * only do so for virtually indexed caches.] 145 * 146 * We don't check if the cache level exists as it is allowed to return 147 * an UNKNOWN value if not. 148 */ 149 return SYS_FIELD_PREP(CCSIDR_EL1, LineSize, line_size - 4); 150 } 151 152 static int set_ccsidr(struct kvm_vcpu *vcpu, u32 csselr, u32 val) 153 { 154 u8 line_size = FIELD_GET(CCSIDR_EL1_LineSize, val) + 4; 155 u32 *ccsidr = vcpu->arch.ccsidr; 156 u32 i; 157 158 if ((val & CCSIDR_EL1_RES0) || 159 line_size < get_min_cache_line_size(csselr & CSSELR_EL1_InD)) 160 return -EINVAL; 161 162 if (!ccsidr) { 163 if (val == get_ccsidr(vcpu, csselr)) 164 return 0; 165 166 ccsidr = kmalloc_array(CSSELR_MAX, sizeof(u32), GFP_KERNEL_ACCOUNT); 167 if (!ccsidr) 168 return -ENOMEM; 169 170 for (i = 0; i < CSSELR_MAX; i++) 171 ccsidr[i] = get_ccsidr(vcpu, i); 172 173 vcpu->arch.ccsidr = ccsidr; 174 } 175 176 ccsidr[csselr] = val; 177 178 return 0; 179 } 180 181 static bool access_rw(struct kvm_vcpu *vcpu, 182 struct sys_reg_params *p, 183 const struct sys_reg_desc *r) 184 { 185 if (p->is_write) 186 vcpu_write_sys_reg(vcpu, p->regval, r->reg); 187 else 188 p->regval = vcpu_read_sys_reg(vcpu, r->reg); 189 190 return true; 191 } 192 193 /* 194 * See note at ARMv7 ARM B1.14.4 (TL;DR: S/W ops are not easily virtualized). 195 */ 196 static bool access_dcsw(struct kvm_vcpu *vcpu, 197 struct sys_reg_params *p, 198 const struct sys_reg_desc *r) 199 { 200 if (!p->is_write) 201 return read_from_write_only(vcpu, p, r); 202 203 /* 204 * Only track S/W ops if we don't have FWB. It still indicates 205 * that the guest is a bit broken (S/W operations should only 206 * be done by firmware, knowing that there is only a single 207 * CPU left in the system, and certainly not from non-secure 208 * software). 209 */ 210 if (!cpus_have_const_cap(ARM64_HAS_STAGE2_FWB)) 211 kvm_set_way_flush(vcpu); 212 213 return true; 214 } 215 216 static bool access_dcgsw(struct kvm_vcpu *vcpu, 217 struct sys_reg_params *p, 218 const struct sys_reg_desc *r) 219 { 220 if (!kvm_has_mte(vcpu->kvm)) { 221 kvm_inject_undefined(vcpu); 222 return false; 223 } 224 225 /* Treat MTE S/W ops as we treat the classic ones: with contempt */ 226 return access_dcsw(vcpu, p, r); 227 } 228 229 static void get_access_mask(const struct sys_reg_desc *r, u64 *mask, u64 *shift) 230 { 231 switch (r->aarch32_map) { 232 case AA32_LO: 233 *mask = GENMASK_ULL(31, 0); 234 *shift = 0; 235 break; 236 case AA32_HI: 237 *mask = GENMASK_ULL(63, 32); 238 *shift = 32; 239 break; 240 default: 241 *mask = GENMASK_ULL(63, 0); 242 *shift = 0; 243 break; 244 } 245 } 246 247 /* 248 * Generic accessor for VM registers. Only called as long as HCR_TVM 249 * is set. If the guest enables the MMU, we stop trapping the VM 250 * sys_regs and leave it in complete control of the caches. 251 */ 252 static bool access_vm_reg(struct kvm_vcpu *vcpu, 253 struct sys_reg_params *p, 254 const struct sys_reg_desc *r) 255 { 256 bool was_enabled = vcpu_has_cache_enabled(vcpu); 257 u64 val, mask, shift; 258 259 BUG_ON(!p->is_write); 260 261 get_access_mask(r, &mask, &shift); 262 263 if (~mask) { 264 val = vcpu_read_sys_reg(vcpu, r->reg); 265 val &= ~mask; 266 } else { 267 val = 0; 268 } 269 270 val |= (p->regval & (mask >> shift)) << shift; 271 vcpu_write_sys_reg(vcpu, val, r->reg); 272 273 kvm_toggle_cache(vcpu, was_enabled); 274 return true; 275 } 276 277 static bool access_actlr(struct kvm_vcpu *vcpu, 278 struct sys_reg_params *p, 279 const struct sys_reg_desc *r) 280 { 281 u64 mask, shift; 282 283 if (p->is_write) 284 return ignore_write(vcpu, p); 285 286 get_access_mask(r, &mask, &shift); 287 p->regval = (vcpu_read_sys_reg(vcpu, r->reg) & mask) >> shift; 288 289 return true; 290 } 291 292 /* 293 * Trap handler for the GICv3 SGI generation system register. 294 * Forward the request to the VGIC emulation. 295 * The cp15_64 code makes sure this automatically works 296 * for both AArch64 and AArch32 accesses. 297 */ 298 static bool access_gic_sgi(struct kvm_vcpu *vcpu, 299 struct sys_reg_params *p, 300 const struct sys_reg_desc *r) 301 { 302 bool g1; 303 304 if (!p->is_write) 305 return read_from_write_only(vcpu, p, r); 306 307 /* 308 * In a system where GICD_CTLR.DS=1, a ICC_SGI0R_EL1 access generates 309 * Group0 SGIs only, while ICC_SGI1R_EL1 can generate either group, 310 * depending on the SGI configuration. ICC_ASGI1R_EL1 is effectively 311 * equivalent to ICC_SGI0R_EL1, as there is no "alternative" secure 312 * group. 313 */ 314 if (p->Op0 == 0) { /* AArch32 */ 315 switch (p->Op1) { 316 default: /* Keep GCC quiet */ 317 case 0: /* ICC_SGI1R */ 318 g1 = true; 319 break; 320 case 1: /* ICC_ASGI1R */ 321 case 2: /* ICC_SGI0R */ 322 g1 = false; 323 break; 324 } 325 } else { /* AArch64 */ 326 switch (p->Op2) { 327 default: /* Keep GCC quiet */ 328 case 5: /* ICC_SGI1R_EL1 */ 329 g1 = true; 330 break; 331 case 6: /* ICC_ASGI1R_EL1 */ 332 case 7: /* ICC_SGI0R_EL1 */ 333 g1 = false; 334 break; 335 } 336 } 337 338 vgic_v3_dispatch_sgi(vcpu, p->regval, g1); 339 340 return true; 341 } 342 343 static bool access_gic_sre(struct kvm_vcpu *vcpu, 344 struct sys_reg_params *p, 345 const struct sys_reg_desc *r) 346 { 347 if (p->is_write) 348 return ignore_write(vcpu, p); 349 350 p->regval = vcpu->arch.vgic_cpu.vgic_v3.vgic_sre; 351 return true; 352 } 353 354 static bool trap_raz_wi(struct kvm_vcpu *vcpu, 355 struct sys_reg_params *p, 356 const struct sys_reg_desc *r) 357 { 358 if (p->is_write) 359 return ignore_write(vcpu, p); 360 else 361 return read_zero(vcpu, p); 362 } 363 364 static bool trap_undef(struct kvm_vcpu *vcpu, 365 struct sys_reg_params *p, 366 const struct sys_reg_desc *r) 367 { 368 kvm_inject_undefined(vcpu); 369 return false; 370 } 371 372 /* 373 * ARMv8.1 mandates at least a trivial LORegion implementation, where all the 374 * RW registers are RES0 (which we can implement as RAZ/WI). On an ARMv8.0 375 * system, these registers should UNDEF. LORID_EL1 being a RO register, we 376 * treat it separately. 377 */ 378 static bool trap_loregion(struct kvm_vcpu *vcpu, 379 struct sys_reg_params *p, 380 const struct sys_reg_desc *r) 381 { 382 u64 val = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1); 383 u32 sr = reg_to_encoding(r); 384 385 if (!(val & (0xfUL << ID_AA64MMFR1_EL1_LO_SHIFT))) { 386 kvm_inject_undefined(vcpu); 387 return false; 388 } 389 390 if (p->is_write && sr == SYS_LORID_EL1) 391 return write_to_read_only(vcpu, p, r); 392 393 return trap_raz_wi(vcpu, p, r); 394 } 395 396 static bool trap_oslar_el1(struct kvm_vcpu *vcpu, 397 struct sys_reg_params *p, 398 const struct sys_reg_desc *r) 399 { 400 u64 oslsr; 401 402 if (!p->is_write) 403 return read_from_write_only(vcpu, p, r); 404 405 /* Forward the OSLK bit to OSLSR */ 406 oslsr = __vcpu_sys_reg(vcpu, OSLSR_EL1) & ~OSLSR_EL1_OSLK; 407 if (p->regval & OSLAR_EL1_OSLK) 408 oslsr |= OSLSR_EL1_OSLK; 409 410 __vcpu_sys_reg(vcpu, OSLSR_EL1) = oslsr; 411 return true; 412 } 413 414 static bool trap_oslsr_el1(struct kvm_vcpu *vcpu, 415 struct sys_reg_params *p, 416 const struct sys_reg_desc *r) 417 { 418 if (p->is_write) 419 return write_to_read_only(vcpu, p, r); 420 421 p->regval = __vcpu_sys_reg(vcpu, r->reg); 422 return true; 423 } 424 425 static int set_oslsr_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 426 u64 val) 427 { 428 /* 429 * The only modifiable bit is the OSLK bit. Refuse the write if 430 * userspace attempts to change any other bit in the register. 431 */ 432 if ((val ^ rd->val) & ~OSLSR_EL1_OSLK) 433 return -EINVAL; 434 435 __vcpu_sys_reg(vcpu, rd->reg) = val; 436 return 0; 437 } 438 439 static bool trap_dbgauthstatus_el1(struct kvm_vcpu *vcpu, 440 struct sys_reg_params *p, 441 const struct sys_reg_desc *r) 442 { 443 if (p->is_write) { 444 return ignore_write(vcpu, p); 445 } else { 446 p->regval = read_sysreg(dbgauthstatus_el1); 447 return true; 448 } 449 } 450 451 /* 452 * We want to avoid world-switching all the DBG registers all the 453 * time: 454 * 455 * - If we've touched any debug register, it is likely that we're 456 * going to touch more of them. It then makes sense to disable the 457 * traps and start doing the save/restore dance 458 * - If debug is active (DBG_MDSCR_KDE or DBG_MDSCR_MDE set), it is 459 * then mandatory to save/restore the registers, as the guest 460 * depends on them. 461 * 462 * For this, we use a DIRTY bit, indicating the guest has modified the 463 * debug registers, used as follow: 464 * 465 * On guest entry: 466 * - If the dirty bit is set (because we're coming back from trapping), 467 * disable the traps, save host registers, restore guest registers. 468 * - If debug is actively in use (DBG_MDSCR_KDE or DBG_MDSCR_MDE set), 469 * set the dirty bit, disable the traps, save host registers, 470 * restore guest registers. 471 * - Otherwise, enable the traps 472 * 473 * On guest exit: 474 * - If the dirty bit is set, save guest registers, restore host 475 * registers and clear the dirty bit. This ensure that the host can 476 * now use the debug registers. 477 */ 478 static bool trap_debug_regs(struct kvm_vcpu *vcpu, 479 struct sys_reg_params *p, 480 const struct sys_reg_desc *r) 481 { 482 access_rw(vcpu, p, r); 483 if (p->is_write) 484 vcpu_set_flag(vcpu, DEBUG_DIRTY); 485 486 trace_trap_reg(__func__, r->reg, p->is_write, p->regval); 487 488 return true; 489 } 490 491 /* 492 * reg_to_dbg/dbg_to_reg 493 * 494 * A 32 bit write to a debug register leave top bits alone 495 * A 32 bit read from a debug register only returns the bottom bits 496 * 497 * All writes will set the DEBUG_DIRTY flag to ensure the hyp code 498 * switches between host and guest values in future. 499 */ 500 static void reg_to_dbg(struct kvm_vcpu *vcpu, 501 struct sys_reg_params *p, 502 const struct sys_reg_desc *rd, 503 u64 *dbg_reg) 504 { 505 u64 mask, shift, val; 506 507 get_access_mask(rd, &mask, &shift); 508 509 val = *dbg_reg; 510 val &= ~mask; 511 val |= (p->regval & (mask >> shift)) << shift; 512 *dbg_reg = val; 513 514 vcpu_set_flag(vcpu, DEBUG_DIRTY); 515 } 516 517 static void dbg_to_reg(struct kvm_vcpu *vcpu, 518 struct sys_reg_params *p, 519 const struct sys_reg_desc *rd, 520 u64 *dbg_reg) 521 { 522 u64 mask, shift; 523 524 get_access_mask(rd, &mask, &shift); 525 p->regval = (*dbg_reg & mask) >> shift; 526 } 527 528 static bool trap_bvr(struct kvm_vcpu *vcpu, 529 struct sys_reg_params *p, 530 const struct sys_reg_desc *rd) 531 { 532 u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->CRm]; 533 534 if (p->is_write) 535 reg_to_dbg(vcpu, p, rd, dbg_reg); 536 else 537 dbg_to_reg(vcpu, p, rd, dbg_reg); 538 539 trace_trap_reg(__func__, rd->CRm, p->is_write, *dbg_reg); 540 541 return true; 542 } 543 544 static int set_bvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 545 u64 val) 546 { 547 vcpu->arch.vcpu_debug_state.dbg_bvr[rd->CRm] = val; 548 return 0; 549 } 550 551 static int get_bvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 552 u64 *val) 553 { 554 *val = vcpu->arch.vcpu_debug_state.dbg_bvr[rd->CRm]; 555 return 0; 556 } 557 558 static u64 reset_bvr(struct kvm_vcpu *vcpu, 559 const struct sys_reg_desc *rd) 560 { 561 vcpu->arch.vcpu_debug_state.dbg_bvr[rd->CRm] = rd->val; 562 return rd->val; 563 } 564 565 static bool trap_bcr(struct kvm_vcpu *vcpu, 566 struct sys_reg_params *p, 567 const struct sys_reg_desc *rd) 568 { 569 u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bcr[rd->CRm]; 570 571 if (p->is_write) 572 reg_to_dbg(vcpu, p, rd, dbg_reg); 573 else 574 dbg_to_reg(vcpu, p, rd, dbg_reg); 575 576 trace_trap_reg(__func__, rd->CRm, p->is_write, *dbg_reg); 577 578 return true; 579 } 580 581 static int set_bcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 582 u64 val) 583 { 584 vcpu->arch.vcpu_debug_state.dbg_bcr[rd->CRm] = val; 585 return 0; 586 } 587 588 static int get_bcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 589 u64 *val) 590 { 591 *val = vcpu->arch.vcpu_debug_state.dbg_bcr[rd->CRm]; 592 return 0; 593 } 594 595 static u64 reset_bcr(struct kvm_vcpu *vcpu, 596 const struct sys_reg_desc *rd) 597 { 598 vcpu->arch.vcpu_debug_state.dbg_bcr[rd->CRm] = rd->val; 599 return rd->val; 600 } 601 602 static bool trap_wvr(struct kvm_vcpu *vcpu, 603 struct sys_reg_params *p, 604 const struct sys_reg_desc *rd) 605 { 606 u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm]; 607 608 if (p->is_write) 609 reg_to_dbg(vcpu, p, rd, dbg_reg); 610 else 611 dbg_to_reg(vcpu, p, rd, dbg_reg); 612 613 trace_trap_reg(__func__, rd->CRm, p->is_write, 614 vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm]); 615 616 return true; 617 } 618 619 static int set_wvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 620 u64 val) 621 { 622 vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm] = val; 623 return 0; 624 } 625 626 static int get_wvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 627 u64 *val) 628 { 629 *val = vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm]; 630 return 0; 631 } 632 633 static u64 reset_wvr(struct kvm_vcpu *vcpu, 634 const struct sys_reg_desc *rd) 635 { 636 vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm] = rd->val; 637 return rd->val; 638 } 639 640 static bool trap_wcr(struct kvm_vcpu *vcpu, 641 struct sys_reg_params *p, 642 const struct sys_reg_desc *rd) 643 { 644 u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_wcr[rd->CRm]; 645 646 if (p->is_write) 647 reg_to_dbg(vcpu, p, rd, dbg_reg); 648 else 649 dbg_to_reg(vcpu, p, rd, dbg_reg); 650 651 trace_trap_reg(__func__, rd->CRm, p->is_write, *dbg_reg); 652 653 return true; 654 } 655 656 static int set_wcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 657 u64 val) 658 { 659 vcpu->arch.vcpu_debug_state.dbg_wcr[rd->CRm] = val; 660 return 0; 661 } 662 663 static int get_wcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 664 u64 *val) 665 { 666 *val = vcpu->arch.vcpu_debug_state.dbg_wcr[rd->CRm]; 667 return 0; 668 } 669 670 static u64 reset_wcr(struct kvm_vcpu *vcpu, 671 const struct sys_reg_desc *rd) 672 { 673 vcpu->arch.vcpu_debug_state.dbg_wcr[rd->CRm] = rd->val; 674 return rd->val; 675 } 676 677 static u64 reset_amair_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 678 { 679 u64 amair = read_sysreg(amair_el1); 680 vcpu_write_sys_reg(vcpu, amair, AMAIR_EL1); 681 return amair; 682 } 683 684 static u64 reset_actlr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 685 { 686 u64 actlr = read_sysreg(actlr_el1); 687 vcpu_write_sys_reg(vcpu, actlr, ACTLR_EL1); 688 return actlr; 689 } 690 691 static u64 reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 692 { 693 u64 mpidr; 694 695 /* 696 * Map the vcpu_id into the first three affinity level fields of 697 * the MPIDR. We limit the number of VCPUs in level 0 due to a 698 * limitation to 16 CPUs in that level in the ICC_SGIxR registers 699 * of the GICv3 to be able to address each CPU directly when 700 * sending IPIs. 701 */ 702 mpidr = (vcpu->vcpu_id & 0x0f) << MPIDR_LEVEL_SHIFT(0); 703 mpidr |= ((vcpu->vcpu_id >> 4) & 0xff) << MPIDR_LEVEL_SHIFT(1); 704 mpidr |= ((vcpu->vcpu_id >> 12) & 0xff) << MPIDR_LEVEL_SHIFT(2); 705 mpidr |= (1ULL << 31); 706 vcpu_write_sys_reg(vcpu, mpidr, MPIDR_EL1); 707 708 return mpidr; 709 } 710 711 static unsigned int pmu_visibility(const struct kvm_vcpu *vcpu, 712 const struct sys_reg_desc *r) 713 { 714 if (kvm_vcpu_has_pmu(vcpu)) 715 return 0; 716 717 return REG_HIDDEN; 718 } 719 720 static u64 reset_pmu_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 721 { 722 u64 n, mask = BIT(ARMV8_PMU_CYCLE_IDX); 723 724 /* No PMU available, any PMU reg may UNDEF... */ 725 if (!kvm_arm_support_pmu_v3()) 726 return 0; 727 728 n = read_sysreg(pmcr_el0) >> ARMV8_PMU_PMCR_N_SHIFT; 729 n &= ARMV8_PMU_PMCR_N_MASK; 730 if (n) 731 mask |= GENMASK(n - 1, 0); 732 733 reset_unknown(vcpu, r); 734 __vcpu_sys_reg(vcpu, r->reg) &= mask; 735 736 return __vcpu_sys_reg(vcpu, r->reg); 737 } 738 739 static u64 reset_pmevcntr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 740 { 741 reset_unknown(vcpu, r); 742 __vcpu_sys_reg(vcpu, r->reg) &= GENMASK(31, 0); 743 744 return __vcpu_sys_reg(vcpu, r->reg); 745 } 746 747 static u64 reset_pmevtyper(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 748 { 749 reset_unknown(vcpu, r); 750 __vcpu_sys_reg(vcpu, r->reg) &= ARMV8_PMU_EVTYPE_MASK; 751 752 return __vcpu_sys_reg(vcpu, r->reg); 753 } 754 755 static u64 reset_pmselr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 756 { 757 reset_unknown(vcpu, r); 758 __vcpu_sys_reg(vcpu, r->reg) &= ARMV8_PMU_COUNTER_MASK; 759 760 return __vcpu_sys_reg(vcpu, r->reg); 761 } 762 763 static u64 reset_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 764 { 765 u64 pmcr; 766 767 /* No PMU available, PMCR_EL0 may UNDEF... */ 768 if (!kvm_arm_support_pmu_v3()) 769 return 0; 770 771 /* Only preserve PMCR_EL0.N, and reset the rest to 0 */ 772 pmcr = read_sysreg(pmcr_el0) & (ARMV8_PMU_PMCR_N_MASK << ARMV8_PMU_PMCR_N_SHIFT); 773 if (!kvm_supports_32bit_el0()) 774 pmcr |= ARMV8_PMU_PMCR_LC; 775 776 __vcpu_sys_reg(vcpu, r->reg) = pmcr; 777 778 return __vcpu_sys_reg(vcpu, r->reg); 779 } 780 781 static bool check_pmu_access_disabled(struct kvm_vcpu *vcpu, u64 flags) 782 { 783 u64 reg = __vcpu_sys_reg(vcpu, PMUSERENR_EL0); 784 bool enabled = (reg & flags) || vcpu_mode_priv(vcpu); 785 786 if (!enabled) 787 kvm_inject_undefined(vcpu); 788 789 return !enabled; 790 } 791 792 static bool pmu_access_el0_disabled(struct kvm_vcpu *vcpu) 793 { 794 return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_EN); 795 } 796 797 static bool pmu_write_swinc_el0_disabled(struct kvm_vcpu *vcpu) 798 { 799 return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_SW | ARMV8_PMU_USERENR_EN); 800 } 801 802 static bool pmu_access_cycle_counter_el0_disabled(struct kvm_vcpu *vcpu) 803 { 804 return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_CR | ARMV8_PMU_USERENR_EN); 805 } 806 807 static bool pmu_access_event_counter_el0_disabled(struct kvm_vcpu *vcpu) 808 { 809 return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_ER | ARMV8_PMU_USERENR_EN); 810 } 811 812 static bool access_pmcr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 813 const struct sys_reg_desc *r) 814 { 815 u64 val; 816 817 if (pmu_access_el0_disabled(vcpu)) 818 return false; 819 820 if (p->is_write) { 821 /* 822 * Only update writeable bits of PMCR (continuing into 823 * kvm_pmu_handle_pmcr() as well) 824 */ 825 val = __vcpu_sys_reg(vcpu, PMCR_EL0); 826 val &= ~ARMV8_PMU_PMCR_MASK; 827 val |= p->regval & ARMV8_PMU_PMCR_MASK; 828 if (!kvm_supports_32bit_el0()) 829 val |= ARMV8_PMU_PMCR_LC; 830 kvm_pmu_handle_pmcr(vcpu, val); 831 } else { 832 /* PMCR.P & PMCR.C are RAZ */ 833 val = __vcpu_sys_reg(vcpu, PMCR_EL0) 834 & ~(ARMV8_PMU_PMCR_P | ARMV8_PMU_PMCR_C); 835 p->regval = val; 836 } 837 838 return true; 839 } 840 841 static bool access_pmselr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 842 const struct sys_reg_desc *r) 843 { 844 if (pmu_access_event_counter_el0_disabled(vcpu)) 845 return false; 846 847 if (p->is_write) 848 __vcpu_sys_reg(vcpu, PMSELR_EL0) = p->regval; 849 else 850 /* return PMSELR.SEL field */ 851 p->regval = __vcpu_sys_reg(vcpu, PMSELR_EL0) 852 & ARMV8_PMU_COUNTER_MASK; 853 854 return true; 855 } 856 857 static bool access_pmceid(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 858 const struct sys_reg_desc *r) 859 { 860 u64 pmceid, mask, shift; 861 862 BUG_ON(p->is_write); 863 864 if (pmu_access_el0_disabled(vcpu)) 865 return false; 866 867 get_access_mask(r, &mask, &shift); 868 869 pmceid = kvm_pmu_get_pmceid(vcpu, (p->Op2 & 1)); 870 pmceid &= mask; 871 pmceid >>= shift; 872 873 p->regval = pmceid; 874 875 return true; 876 } 877 878 static bool pmu_counter_idx_valid(struct kvm_vcpu *vcpu, u64 idx) 879 { 880 u64 pmcr, val; 881 882 pmcr = __vcpu_sys_reg(vcpu, PMCR_EL0); 883 val = (pmcr >> ARMV8_PMU_PMCR_N_SHIFT) & ARMV8_PMU_PMCR_N_MASK; 884 if (idx >= val && idx != ARMV8_PMU_CYCLE_IDX) { 885 kvm_inject_undefined(vcpu); 886 return false; 887 } 888 889 return true; 890 } 891 892 static int get_pmu_evcntr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r, 893 u64 *val) 894 { 895 u64 idx; 896 897 if (r->CRn == 9 && r->CRm == 13 && r->Op2 == 0) 898 /* PMCCNTR_EL0 */ 899 idx = ARMV8_PMU_CYCLE_IDX; 900 else 901 /* PMEVCNTRn_EL0 */ 902 idx = ((r->CRm & 3) << 3) | (r->Op2 & 7); 903 904 *val = kvm_pmu_get_counter_value(vcpu, idx); 905 return 0; 906 } 907 908 static bool access_pmu_evcntr(struct kvm_vcpu *vcpu, 909 struct sys_reg_params *p, 910 const struct sys_reg_desc *r) 911 { 912 u64 idx = ~0UL; 913 914 if (r->CRn == 9 && r->CRm == 13) { 915 if (r->Op2 == 2) { 916 /* PMXEVCNTR_EL0 */ 917 if (pmu_access_event_counter_el0_disabled(vcpu)) 918 return false; 919 920 idx = __vcpu_sys_reg(vcpu, PMSELR_EL0) 921 & ARMV8_PMU_COUNTER_MASK; 922 } else if (r->Op2 == 0) { 923 /* PMCCNTR_EL0 */ 924 if (pmu_access_cycle_counter_el0_disabled(vcpu)) 925 return false; 926 927 idx = ARMV8_PMU_CYCLE_IDX; 928 } 929 } else if (r->CRn == 0 && r->CRm == 9) { 930 /* PMCCNTR */ 931 if (pmu_access_event_counter_el0_disabled(vcpu)) 932 return false; 933 934 idx = ARMV8_PMU_CYCLE_IDX; 935 } else if (r->CRn == 14 && (r->CRm & 12) == 8) { 936 /* PMEVCNTRn_EL0 */ 937 if (pmu_access_event_counter_el0_disabled(vcpu)) 938 return false; 939 940 idx = ((r->CRm & 3) << 3) | (r->Op2 & 7); 941 } 942 943 /* Catch any decoding mistake */ 944 WARN_ON(idx == ~0UL); 945 946 if (!pmu_counter_idx_valid(vcpu, idx)) 947 return false; 948 949 if (p->is_write) { 950 if (pmu_access_el0_disabled(vcpu)) 951 return false; 952 953 kvm_pmu_set_counter_value(vcpu, idx, p->regval); 954 } else { 955 p->regval = kvm_pmu_get_counter_value(vcpu, idx); 956 } 957 958 return true; 959 } 960 961 static bool access_pmu_evtyper(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 962 const struct sys_reg_desc *r) 963 { 964 u64 idx, reg; 965 966 if (pmu_access_el0_disabled(vcpu)) 967 return false; 968 969 if (r->CRn == 9 && r->CRm == 13 && r->Op2 == 1) { 970 /* PMXEVTYPER_EL0 */ 971 idx = __vcpu_sys_reg(vcpu, PMSELR_EL0) & ARMV8_PMU_COUNTER_MASK; 972 reg = PMEVTYPER0_EL0 + idx; 973 } else if (r->CRn == 14 && (r->CRm & 12) == 12) { 974 idx = ((r->CRm & 3) << 3) | (r->Op2 & 7); 975 if (idx == ARMV8_PMU_CYCLE_IDX) 976 reg = PMCCFILTR_EL0; 977 else 978 /* PMEVTYPERn_EL0 */ 979 reg = PMEVTYPER0_EL0 + idx; 980 } else { 981 BUG(); 982 } 983 984 if (!pmu_counter_idx_valid(vcpu, idx)) 985 return false; 986 987 if (p->is_write) { 988 kvm_pmu_set_counter_event_type(vcpu, p->regval, idx); 989 kvm_vcpu_pmu_restore_guest(vcpu); 990 } else { 991 p->regval = __vcpu_sys_reg(vcpu, reg) & ARMV8_PMU_EVTYPE_MASK; 992 } 993 994 return true; 995 } 996 997 static bool access_pmcnten(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 998 const struct sys_reg_desc *r) 999 { 1000 u64 val, mask; 1001 1002 if (pmu_access_el0_disabled(vcpu)) 1003 return false; 1004 1005 mask = kvm_pmu_valid_counter_mask(vcpu); 1006 if (p->is_write) { 1007 val = p->regval & mask; 1008 if (r->Op2 & 0x1) { 1009 /* accessing PMCNTENSET_EL0 */ 1010 __vcpu_sys_reg(vcpu, PMCNTENSET_EL0) |= val; 1011 kvm_pmu_enable_counter_mask(vcpu, val); 1012 kvm_vcpu_pmu_restore_guest(vcpu); 1013 } else { 1014 /* accessing PMCNTENCLR_EL0 */ 1015 __vcpu_sys_reg(vcpu, PMCNTENSET_EL0) &= ~val; 1016 kvm_pmu_disable_counter_mask(vcpu, val); 1017 } 1018 } else { 1019 p->regval = __vcpu_sys_reg(vcpu, PMCNTENSET_EL0); 1020 } 1021 1022 return true; 1023 } 1024 1025 static bool access_pminten(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1026 const struct sys_reg_desc *r) 1027 { 1028 u64 mask = kvm_pmu_valid_counter_mask(vcpu); 1029 1030 if (check_pmu_access_disabled(vcpu, 0)) 1031 return false; 1032 1033 if (p->is_write) { 1034 u64 val = p->regval & mask; 1035 1036 if (r->Op2 & 0x1) 1037 /* accessing PMINTENSET_EL1 */ 1038 __vcpu_sys_reg(vcpu, PMINTENSET_EL1) |= val; 1039 else 1040 /* accessing PMINTENCLR_EL1 */ 1041 __vcpu_sys_reg(vcpu, PMINTENSET_EL1) &= ~val; 1042 } else { 1043 p->regval = __vcpu_sys_reg(vcpu, PMINTENSET_EL1); 1044 } 1045 1046 return true; 1047 } 1048 1049 static bool access_pmovs(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1050 const struct sys_reg_desc *r) 1051 { 1052 u64 mask = kvm_pmu_valid_counter_mask(vcpu); 1053 1054 if (pmu_access_el0_disabled(vcpu)) 1055 return false; 1056 1057 if (p->is_write) { 1058 if (r->CRm & 0x2) 1059 /* accessing PMOVSSET_EL0 */ 1060 __vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= (p->regval & mask); 1061 else 1062 /* accessing PMOVSCLR_EL0 */ 1063 __vcpu_sys_reg(vcpu, PMOVSSET_EL0) &= ~(p->regval & mask); 1064 } else { 1065 p->regval = __vcpu_sys_reg(vcpu, PMOVSSET_EL0); 1066 } 1067 1068 return true; 1069 } 1070 1071 static bool access_pmswinc(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1072 const struct sys_reg_desc *r) 1073 { 1074 u64 mask; 1075 1076 if (!p->is_write) 1077 return read_from_write_only(vcpu, p, r); 1078 1079 if (pmu_write_swinc_el0_disabled(vcpu)) 1080 return false; 1081 1082 mask = kvm_pmu_valid_counter_mask(vcpu); 1083 kvm_pmu_software_increment(vcpu, p->regval & mask); 1084 return true; 1085 } 1086 1087 static bool access_pmuserenr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1088 const struct sys_reg_desc *r) 1089 { 1090 if (p->is_write) { 1091 if (!vcpu_mode_priv(vcpu)) { 1092 kvm_inject_undefined(vcpu); 1093 return false; 1094 } 1095 1096 __vcpu_sys_reg(vcpu, PMUSERENR_EL0) = 1097 p->regval & ARMV8_PMU_USERENR_MASK; 1098 } else { 1099 p->regval = __vcpu_sys_reg(vcpu, PMUSERENR_EL0) 1100 & ARMV8_PMU_USERENR_MASK; 1101 } 1102 1103 return true; 1104 } 1105 1106 /* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go */ 1107 #define DBG_BCR_BVR_WCR_WVR_EL1(n) \ 1108 { SYS_DESC(SYS_DBGBVRn_EL1(n)), \ 1109 trap_bvr, reset_bvr, 0, 0, get_bvr, set_bvr }, \ 1110 { SYS_DESC(SYS_DBGBCRn_EL1(n)), \ 1111 trap_bcr, reset_bcr, 0, 0, get_bcr, set_bcr }, \ 1112 { SYS_DESC(SYS_DBGWVRn_EL1(n)), \ 1113 trap_wvr, reset_wvr, 0, 0, get_wvr, set_wvr }, \ 1114 { SYS_DESC(SYS_DBGWCRn_EL1(n)), \ 1115 trap_wcr, reset_wcr, 0, 0, get_wcr, set_wcr } 1116 1117 #define PMU_SYS_REG(name) \ 1118 SYS_DESC(SYS_##name), .reset = reset_pmu_reg, \ 1119 .visibility = pmu_visibility 1120 1121 /* Macro to expand the PMEVCNTRn_EL0 register */ 1122 #define PMU_PMEVCNTR_EL0(n) \ 1123 { PMU_SYS_REG(PMEVCNTRn_EL0(n)), \ 1124 .reset = reset_pmevcntr, .get_user = get_pmu_evcntr, \ 1125 .access = access_pmu_evcntr, .reg = (PMEVCNTR0_EL0 + n), } 1126 1127 /* Macro to expand the PMEVTYPERn_EL0 register */ 1128 #define PMU_PMEVTYPER_EL0(n) \ 1129 { PMU_SYS_REG(PMEVTYPERn_EL0(n)), \ 1130 .reset = reset_pmevtyper, \ 1131 .access = access_pmu_evtyper, .reg = (PMEVTYPER0_EL0 + n), } 1132 1133 static bool undef_access(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1134 const struct sys_reg_desc *r) 1135 { 1136 kvm_inject_undefined(vcpu); 1137 1138 return false; 1139 } 1140 1141 /* Macro to expand the AMU counter and type registers*/ 1142 #define AMU_AMEVCNTR0_EL0(n) { SYS_DESC(SYS_AMEVCNTR0_EL0(n)), undef_access } 1143 #define AMU_AMEVTYPER0_EL0(n) { SYS_DESC(SYS_AMEVTYPER0_EL0(n)), undef_access } 1144 #define AMU_AMEVCNTR1_EL0(n) { SYS_DESC(SYS_AMEVCNTR1_EL0(n)), undef_access } 1145 #define AMU_AMEVTYPER1_EL0(n) { SYS_DESC(SYS_AMEVTYPER1_EL0(n)), undef_access } 1146 1147 static unsigned int ptrauth_visibility(const struct kvm_vcpu *vcpu, 1148 const struct sys_reg_desc *rd) 1149 { 1150 return vcpu_has_ptrauth(vcpu) ? 0 : REG_HIDDEN; 1151 } 1152 1153 /* 1154 * If we land here on a PtrAuth access, that is because we didn't 1155 * fixup the access on exit by allowing the PtrAuth sysregs. The only 1156 * way this happens is when the guest does not have PtrAuth support 1157 * enabled. 1158 */ 1159 #define __PTRAUTH_KEY(k) \ 1160 { SYS_DESC(SYS_## k), undef_access, reset_unknown, k, \ 1161 .visibility = ptrauth_visibility} 1162 1163 #define PTRAUTH_KEY(k) \ 1164 __PTRAUTH_KEY(k ## KEYLO_EL1), \ 1165 __PTRAUTH_KEY(k ## KEYHI_EL1) 1166 1167 static bool access_arch_timer(struct kvm_vcpu *vcpu, 1168 struct sys_reg_params *p, 1169 const struct sys_reg_desc *r) 1170 { 1171 enum kvm_arch_timers tmr; 1172 enum kvm_arch_timer_regs treg; 1173 u64 reg = reg_to_encoding(r); 1174 1175 switch (reg) { 1176 case SYS_CNTP_TVAL_EL0: 1177 case SYS_AARCH32_CNTP_TVAL: 1178 tmr = TIMER_PTIMER; 1179 treg = TIMER_REG_TVAL; 1180 break; 1181 case SYS_CNTP_CTL_EL0: 1182 case SYS_AARCH32_CNTP_CTL: 1183 tmr = TIMER_PTIMER; 1184 treg = TIMER_REG_CTL; 1185 break; 1186 case SYS_CNTP_CVAL_EL0: 1187 case SYS_AARCH32_CNTP_CVAL: 1188 tmr = TIMER_PTIMER; 1189 treg = TIMER_REG_CVAL; 1190 break; 1191 case SYS_CNTPCT_EL0: 1192 case SYS_CNTPCTSS_EL0: 1193 case SYS_AARCH32_CNTPCT: 1194 tmr = TIMER_PTIMER; 1195 treg = TIMER_REG_CNT; 1196 break; 1197 default: 1198 print_sys_reg_msg(p, "%s", "Unhandled trapped timer register"); 1199 kvm_inject_undefined(vcpu); 1200 return false; 1201 } 1202 1203 if (p->is_write) 1204 kvm_arm_timer_write_sysreg(vcpu, tmr, treg, p->regval); 1205 else 1206 p->regval = kvm_arm_timer_read_sysreg(vcpu, tmr, treg); 1207 1208 return true; 1209 } 1210 1211 static s64 kvm_arm64_ftr_safe_value(u32 id, const struct arm64_ftr_bits *ftrp, 1212 s64 new, s64 cur) 1213 { 1214 struct arm64_ftr_bits kvm_ftr = *ftrp; 1215 1216 /* Some features have different safe value type in KVM than host features */ 1217 switch (id) { 1218 case SYS_ID_AA64DFR0_EL1: 1219 if (kvm_ftr.shift == ID_AA64DFR0_EL1_PMUVer_SHIFT) 1220 kvm_ftr.type = FTR_LOWER_SAFE; 1221 break; 1222 case SYS_ID_DFR0_EL1: 1223 if (kvm_ftr.shift == ID_DFR0_EL1_PerfMon_SHIFT) 1224 kvm_ftr.type = FTR_LOWER_SAFE; 1225 break; 1226 } 1227 1228 return arm64_ftr_safe_value(&kvm_ftr, new, cur); 1229 } 1230 1231 /** 1232 * arm64_check_features() - Check if a feature register value constitutes 1233 * a subset of features indicated by the idreg's KVM sanitised limit. 1234 * 1235 * This function will check if each feature field of @val is the "safe" value 1236 * against idreg's KVM sanitised limit return from reset() callback. 1237 * If a field value in @val is the same as the one in limit, it is always 1238 * considered the safe value regardless For register fields that are not in 1239 * writable, only the value in limit is considered the safe value. 1240 * 1241 * Return: 0 if all the fields are safe. Otherwise, return negative errno. 1242 */ 1243 static int arm64_check_features(struct kvm_vcpu *vcpu, 1244 const struct sys_reg_desc *rd, 1245 u64 val) 1246 { 1247 const struct arm64_ftr_reg *ftr_reg; 1248 const struct arm64_ftr_bits *ftrp = NULL; 1249 u32 id = reg_to_encoding(rd); 1250 u64 writable_mask = rd->val; 1251 u64 limit = rd->reset(vcpu, rd); 1252 u64 mask = 0; 1253 1254 /* 1255 * Hidden and unallocated ID registers may not have a corresponding 1256 * struct arm64_ftr_reg. Of course, if the register is RAZ we know the 1257 * only safe value is 0. 1258 */ 1259 if (sysreg_visible_as_raz(vcpu, rd)) 1260 return val ? -E2BIG : 0; 1261 1262 ftr_reg = get_arm64_ftr_reg(id); 1263 if (!ftr_reg) 1264 return -EINVAL; 1265 1266 ftrp = ftr_reg->ftr_bits; 1267 1268 for (; ftrp && ftrp->width; ftrp++) { 1269 s64 f_val, f_lim, safe_val; 1270 u64 ftr_mask; 1271 1272 ftr_mask = arm64_ftr_mask(ftrp); 1273 if ((ftr_mask & writable_mask) != ftr_mask) 1274 continue; 1275 1276 f_val = arm64_ftr_value(ftrp, val); 1277 f_lim = arm64_ftr_value(ftrp, limit); 1278 mask |= ftr_mask; 1279 1280 if (f_val == f_lim) 1281 safe_val = f_val; 1282 else 1283 safe_val = kvm_arm64_ftr_safe_value(id, ftrp, f_val, f_lim); 1284 1285 if (safe_val != f_val) 1286 return -E2BIG; 1287 } 1288 1289 /* For fields that are not writable, values in limit are the safe values. */ 1290 if ((val & ~mask) != (limit & ~mask)) 1291 return -E2BIG; 1292 1293 return 0; 1294 } 1295 1296 static u8 pmuver_to_perfmon(u8 pmuver) 1297 { 1298 switch (pmuver) { 1299 case ID_AA64DFR0_EL1_PMUVer_IMP: 1300 return ID_DFR0_EL1_PerfMon_PMUv3; 1301 case ID_AA64DFR0_EL1_PMUVer_IMP_DEF: 1302 return ID_DFR0_EL1_PerfMon_IMPDEF; 1303 default: 1304 /* Anything ARMv8.1+ and NI have the same value. For now. */ 1305 return pmuver; 1306 } 1307 } 1308 1309 /* Read a sanitised cpufeature ID register by sys_reg_desc */ 1310 static u64 __kvm_read_sanitised_id_reg(const struct kvm_vcpu *vcpu, 1311 const struct sys_reg_desc *r) 1312 { 1313 u32 id = reg_to_encoding(r); 1314 u64 val; 1315 1316 if (sysreg_visible_as_raz(vcpu, r)) 1317 return 0; 1318 1319 val = read_sanitised_ftr_reg(id); 1320 1321 switch (id) { 1322 case SYS_ID_AA64PFR1_EL1: 1323 if (!kvm_has_mte(vcpu->kvm)) 1324 val &= ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_MTE); 1325 1326 val &= ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_SME); 1327 break; 1328 case SYS_ID_AA64ISAR1_EL1: 1329 if (!vcpu_has_ptrauth(vcpu)) 1330 val &= ~(ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_APA) | 1331 ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_API) | 1332 ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_GPA) | 1333 ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_GPI)); 1334 break; 1335 case SYS_ID_AA64ISAR2_EL1: 1336 if (!vcpu_has_ptrauth(vcpu)) 1337 val &= ~(ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_APA3) | 1338 ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_GPA3)); 1339 if (!cpus_have_final_cap(ARM64_HAS_WFXT)) 1340 val &= ~ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_WFxT); 1341 val &= ~ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_MOPS); 1342 break; 1343 case SYS_ID_AA64MMFR2_EL1: 1344 val &= ~ID_AA64MMFR2_EL1_CCIDX_MASK; 1345 break; 1346 case SYS_ID_MMFR4_EL1: 1347 val &= ~ARM64_FEATURE_MASK(ID_MMFR4_EL1_CCIDX); 1348 break; 1349 } 1350 1351 return val; 1352 } 1353 1354 static u64 kvm_read_sanitised_id_reg(struct kvm_vcpu *vcpu, 1355 const struct sys_reg_desc *r) 1356 { 1357 return __kvm_read_sanitised_id_reg(vcpu, r); 1358 } 1359 1360 static u64 read_id_reg(const struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 1361 { 1362 return IDREG(vcpu->kvm, reg_to_encoding(r)); 1363 } 1364 1365 /* 1366 * Return true if the register's (Op0, Op1, CRn, CRm, Op2) is 1367 * (3, 0, 0, crm, op2), where 1<=crm<8, 0<=op2<8. 1368 */ 1369 static inline bool is_id_reg(u32 id) 1370 { 1371 return (sys_reg_Op0(id) == 3 && sys_reg_Op1(id) == 0 && 1372 sys_reg_CRn(id) == 0 && sys_reg_CRm(id) >= 1 && 1373 sys_reg_CRm(id) < 8); 1374 } 1375 1376 static unsigned int id_visibility(const struct kvm_vcpu *vcpu, 1377 const struct sys_reg_desc *r) 1378 { 1379 u32 id = reg_to_encoding(r); 1380 1381 switch (id) { 1382 case SYS_ID_AA64ZFR0_EL1: 1383 if (!vcpu_has_sve(vcpu)) 1384 return REG_RAZ; 1385 break; 1386 } 1387 1388 return 0; 1389 } 1390 1391 static unsigned int aa32_id_visibility(const struct kvm_vcpu *vcpu, 1392 const struct sys_reg_desc *r) 1393 { 1394 /* 1395 * AArch32 ID registers are UNKNOWN if AArch32 isn't implemented at any 1396 * EL. Promote to RAZ/WI in order to guarantee consistency between 1397 * systems. 1398 */ 1399 if (!kvm_supports_32bit_el0()) 1400 return REG_RAZ | REG_USER_WI; 1401 1402 return id_visibility(vcpu, r); 1403 } 1404 1405 static unsigned int raz_visibility(const struct kvm_vcpu *vcpu, 1406 const struct sys_reg_desc *r) 1407 { 1408 return REG_RAZ; 1409 } 1410 1411 /* cpufeature ID register access trap handlers */ 1412 1413 static bool access_id_reg(struct kvm_vcpu *vcpu, 1414 struct sys_reg_params *p, 1415 const struct sys_reg_desc *r) 1416 { 1417 if (p->is_write) 1418 return write_to_read_only(vcpu, p, r); 1419 1420 p->regval = read_id_reg(vcpu, r); 1421 if (vcpu_has_nv(vcpu)) 1422 access_nested_id_reg(vcpu, p, r); 1423 1424 return true; 1425 } 1426 1427 /* Visibility overrides for SVE-specific control registers */ 1428 static unsigned int sve_visibility(const struct kvm_vcpu *vcpu, 1429 const struct sys_reg_desc *rd) 1430 { 1431 if (vcpu_has_sve(vcpu)) 1432 return 0; 1433 1434 return REG_HIDDEN; 1435 } 1436 1437 static u64 read_sanitised_id_aa64pfr0_el1(struct kvm_vcpu *vcpu, 1438 const struct sys_reg_desc *rd) 1439 { 1440 u64 val = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1); 1441 1442 if (!vcpu_has_sve(vcpu)) 1443 val &= ~ID_AA64PFR0_EL1_SVE_MASK; 1444 1445 /* 1446 * The default is to expose CSV2 == 1 if the HW isn't affected. 1447 * Although this is a per-CPU feature, we make it global because 1448 * asymmetric systems are just a nuisance. 1449 * 1450 * Userspace can override this as long as it doesn't promise 1451 * the impossible. 1452 */ 1453 if (arm64_get_spectre_v2_state() == SPECTRE_UNAFFECTED) { 1454 val &= ~ID_AA64PFR0_EL1_CSV2_MASK; 1455 val |= SYS_FIELD_PREP_ENUM(ID_AA64PFR0_EL1, CSV2, IMP); 1456 } 1457 if (arm64_get_meltdown_state() == SPECTRE_UNAFFECTED) { 1458 val &= ~ID_AA64PFR0_EL1_CSV3_MASK; 1459 val |= SYS_FIELD_PREP_ENUM(ID_AA64PFR0_EL1, CSV3, IMP); 1460 } 1461 1462 if (kvm_vgic_global_state.type == VGIC_V3) { 1463 val &= ~ID_AA64PFR0_EL1_GIC_MASK; 1464 val |= SYS_FIELD_PREP_ENUM(ID_AA64PFR0_EL1, GIC, IMP); 1465 } 1466 1467 val &= ~ID_AA64PFR0_EL1_AMU_MASK; 1468 1469 return val; 1470 } 1471 1472 static u64 read_sanitised_id_aa64dfr0_el1(struct kvm_vcpu *vcpu, 1473 const struct sys_reg_desc *rd) 1474 { 1475 u64 val = read_sanitised_ftr_reg(SYS_ID_AA64DFR0_EL1); 1476 1477 /* Limit debug to ARMv8.0 */ 1478 val &= ~ID_AA64DFR0_EL1_DebugVer_MASK; 1479 val |= SYS_FIELD_PREP_ENUM(ID_AA64DFR0_EL1, DebugVer, IMP); 1480 1481 /* 1482 * Only initialize the PMU version if the vCPU was configured with one. 1483 */ 1484 val &= ~ID_AA64DFR0_EL1_PMUVer_MASK; 1485 if (kvm_vcpu_has_pmu(vcpu)) 1486 val |= SYS_FIELD_PREP(ID_AA64DFR0_EL1, PMUVer, 1487 kvm_arm_pmu_get_pmuver_limit()); 1488 1489 /* Hide SPE from guests */ 1490 val &= ~ID_AA64DFR0_EL1_PMSVer_MASK; 1491 1492 return val; 1493 } 1494 1495 static int set_id_aa64dfr0_el1(struct kvm_vcpu *vcpu, 1496 const struct sys_reg_desc *rd, 1497 u64 val) 1498 { 1499 u8 pmuver = SYS_FIELD_GET(ID_AA64DFR0_EL1, PMUVer, val); 1500 1501 /* 1502 * Prior to commit 3d0dba5764b9 ("KVM: arm64: PMU: Move the 1503 * ID_AA64DFR0_EL1.PMUver limit to VM creation"), KVM erroneously 1504 * exposed an IMP_DEF PMU to userspace and the guest on systems w/ 1505 * non-architectural PMUs. Of course, PMUv3 is the only game in town for 1506 * PMU virtualization, so the IMP_DEF value was rather user-hostile. 1507 * 1508 * At minimum, we're on the hook to allow values that were given to 1509 * userspace by KVM. Cover our tracks here and replace the IMP_DEF value 1510 * with a more sensible NI. The value of an ID register changing under 1511 * the nose of the guest is unfortunate, but is certainly no more 1512 * surprising than an ill-guided PMU driver poking at impdef system 1513 * registers that end in an UNDEF... 1514 */ 1515 if (pmuver == ID_AA64DFR0_EL1_PMUVer_IMP_DEF) 1516 val &= ~ID_AA64DFR0_EL1_PMUVer_MASK; 1517 1518 return set_id_reg(vcpu, rd, val); 1519 } 1520 1521 static u64 read_sanitised_id_dfr0_el1(struct kvm_vcpu *vcpu, 1522 const struct sys_reg_desc *rd) 1523 { 1524 u8 perfmon = pmuver_to_perfmon(kvm_arm_pmu_get_pmuver_limit()); 1525 u64 val = read_sanitised_ftr_reg(SYS_ID_DFR0_EL1); 1526 1527 val &= ~ID_DFR0_EL1_PerfMon_MASK; 1528 if (kvm_vcpu_has_pmu(vcpu)) 1529 val |= SYS_FIELD_PREP(ID_DFR0_EL1, PerfMon, perfmon); 1530 1531 return val; 1532 } 1533 1534 static int set_id_dfr0_el1(struct kvm_vcpu *vcpu, 1535 const struct sys_reg_desc *rd, 1536 u64 val) 1537 { 1538 u8 perfmon = SYS_FIELD_GET(ID_DFR0_EL1, PerfMon, val); 1539 1540 if (perfmon == ID_DFR0_EL1_PerfMon_IMPDEF) { 1541 val &= ~ID_DFR0_EL1_PerfMon_MASK; 1542 perfmon = 0; 1543 } 1544 1545 /* 1546 * Allow DFR0_EL1.PerfMon to be set from userspace as long as 1547 * it doesn't promise more than what the HW gives us on the 1548 * AArch64 side (as everything is emulated with that), and 1549 * that this is a PMUv3. 1550 */ 1551 if (perfmon != 0 && perfmon < ID_DFR0_EL1_PerfMon_PMUv3) 1552 return -EINVAL; 1553 1554 return set_id_reg(vcpu, rd, val); 1555 } 1556 1557 /* 1558 * cpufeature ID register user accessors 1559 * 1560 * For now, these registers are immutable for userspace, so no values 1561 * are stored, and for set_id_reg() we don't allow the effective value 1562 * to be changed. 1563 */ 1564 static int get_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 1565 u64 *val) 1566 { 1567 /* 1568 * Avoid locking if the VM has already started, as the ID registers are 1569 * guaranteed to be invariant at that point. 1570 */ 1571 if (kvm_vm_has_ran_once(vcpu->kvm)) { 1572 *val = read_id_reg(vcpu, rd); 1573 return 0; 1574 } 1575 1576 mutex_lock(&vcpu->kvm->arch.config_lock); 1577 *val = read_id_reg(vcpu, rd); 1578 mutex_unlock(&vcpu->kvm->arch.config_lock); 1579 1580 return 0; 1581 } 1582 1583 static int set_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 1584 u64 val) 1585 { 1586 u32 id = reg_to_encoding(rd); 1587 int ret; 1588 1589 mutex_lock(&vcpu->kvm->arch.config_lock); 1590 1591 /* 1592 * Once the VM has started the ID registers are immutable. Reject any 1593 * write that does not match the final register value. 1594 */ 1595 if (kvm_vm_has_ran_once(vcpu->kvm)) { 1596 if (val != read_id_reg(vcpu, rd)) 1597 ret = -EBUSY; 1598 else 1599 ret = 0; 1600 1601 mutex_unlock(&vcpu->kvm->arch.config_lock); 1602 return ret; 1603 } 1604 1605 ret = arm64_check_features(vcpu, rd, val); 1606 if (!ret) 1607 IDREG(vcpu->kvm, id) = val; 1608 1609 mutex_unlock(&vcpu->kvm->arch.config_lock); 1610 1611 /* 1612 * arm64_check_features() returns -E2BIG to indicate the register's 1613 * feature set is a superset of the maximally-allowed register value. 1614 * While it would be nice to precisely describe this to userspace, the 1615 * existing UAPI for KVM_SET_ONE_REG has it that invalid register 1616 * writes return -EINVAL. 1617 */ 1618 if (ret == -E2BIG) 1619 ret = -EINVAL; 1620 return ret; 1621 } 1622 1623 static int get_raz_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 1624 u64 *val) 1625 { 1626 *val = 0; 1627 return 0; 1628 } 1629 1630 static int set_wi_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 1631 u64 val) 1632 { 1633 return 0; 1634 } 1635 1636 static bool access_ctr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1637 const struct sys_reg_desc *r) 1638 { 1639 if (p->is_write) 1640 return write_to_read_only(vcpu, p, r); 1641 1642 p->regval = read_sanitised_ftr_reg(SYS_CTR_EL0); 1643 return true; 1644 } 1645 1646 static bool access_clidr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1647 const struct sys_reg_desc *r) 1648 { 1649 if (p->is_write) 1650 return write_to_read_only(vcpu, p, r); 1651 1652 p->regval = __vcpu_sys_reg(vcpu, r->reg); 1653 return true; 1654 } 1655 1656 /* 1657 * Fabricate a CLIDR_EL1 value instead of using the real value, which can vary 1658 * by the physical CPU which the vcpu currently resides in. 1659 */ 1660 static u64 reset_clidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 1661 { 1662 u64 ctr_el0 = read_sanitised_ftr_reg(SYS_CTR_EL0); 1663 u64 clidr; 1664 u8 loc; 1665 1666 if ((ctr_el0 & CTR_EL0_IDC)) { 1667 /* 1668 * Data cache clean to the PoU is not required so LoUU and LoUIS 1669 * will not be set and a unified cache, which will be marked as 1670 * LoC, will be added. 1671 * 1672 * If not DIC, let the unified cache L2 so that an instruction 1673 * cache can be added as L1 later. 1674 */ 1675 loc = (ctr_el0 & CTR_EL0_DIC) ? 1 : 2; 1676 clidr = CACHE_TYPE_UNIFIED << CLIDR_CTYPE_SHIFT(loc); 1677 } else { 1678 /* 1679 * Data cache clean to the PoU is required so let L1 have a data 1680 * cache and mark it as LoUU and LoUIS. As L1 has a data cache, 1681 * it can be marked as LoC too. 1682 */ 1683 loc = 1; 1684 clidr = 1 << CLIDR_LOUU_SHIFT; 1685 clidr |= 1 << CLIDR_LOUIS_SHIFT; 1686 clidr |= CACHE_TYPE_DATA << CLIDR_CTYPE_SHIFT(1); 1687 } 1688 1689 /* 1690 * Instruction cache invalidation to the PoU is required so let L1 have 1691 * an instruction cache. If L1 already has a data cache, it will be 1692 * CACHE_TYPE_SEPARATE. 1693 */ 1694 if (!(ctr_el0 & CTR_EL0_DIC)) 1695 clidr |= CACHE_TYPE_INST << CLIDR_CTYPE_SHIFT(1); 1696 1697 clidr |= loc << CLIDR_LOC_SHIFT; 1698 1699 /* 1700 * Add tag cache unified to data cache. Allocation tags and data are 1701 * unified in a cache line so that it looks valid even if there is only 1702 * one cache line. 1703 */ 1704 if (kvm_has_mte(vcpu->kvm)) 1705 clidr |= 2 << CLIDR_TTYPE_SHIFT(loc); 1706 1707 __vcpu_sys_reg(vcpu, r->reg) = clidr; 1708 1709 return __vcpu_sys_reg(vcpu, r->reg); 1710 } 1711 1712 static int set_clidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 1713 u64 val) 1714 { 1715 u64 ctr_el0 = read_sanitised_ftr_reg(SYS_CTR_EL0); 1716 u64 idc = !CLIDR_LOC(val) || (!CLIDR_LOUIS(val) && !CLIDR_LOUU(val)); 1717 1718 if ((val & CLIDR_EL1_RES0) || (!(ctr_el0 & CTR_EL0_IDC) && idc)) 1719 return -EINVAL; 1720 1721 __vcpu_sys_reg(vcpu, rd->reg) = val; 1722 1723 return 0; 1724 } 1725 1726 static bool access_csselr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1727 const struct sys_reg_desc *r) 1728 { 1729 int reg = r->reg; 1730 1731 if (p->is_write) 1732 vcpu_write_sys_reg(vcpu, p->regval, reg); 1733 else 1734 p->regval = vcpu_read_sys_reg(vcpu, reg); 1735 return true; 1736 } 1737 1738 static bool access_ccsidr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1739 const struct sys_reg_desc *r) 1740 { 1741 u32 csselr; 1742 1743 if (p->is_write) 1744 return write_to_read_only(vcpu, p, r); 1745 1746 csselr = vcpu_read_sys_reg(vcpu, CSSELR_EL1); 1747 csselr &= CSSELR_EL1_Level | CSSELR_EL1_InD; 1748 if (csselr < CSSELR_MAX) 1749 p->regval = get_ccsidr(vcpu, csselr); 1750 1751 return true; 1752 } 1753 1754 static unsigned int mte_visibility(const struct kvm_vcpu *vcpu, 1755 const struct sys_reg_desc *rd) 1756 { 1757 if (kvm_has_mte(vcpu->kvm)) 1758 return 0; 1759 1760 return REG_HIDDEN; 1761 } 1762 1763 #define MTE_REG(name) { \ 1764 SYS_DESC(SYS_##name), \ 1765 .access = undef_access, \ 1766 .reset = reset_unknown, \ 1767 .reg = name, \ 1768 .visibility = mte_visibility, \ 1769 } 1770 1771 static unsigned int el2_visibility(const struct kvm_vcpu *vcpu, 1772 const struct sys_reg_desc *rd) 1773 { 1774 if (vcpu_has_nv(vcpu)) 1775 return 0; 1776 1777 return REG_HIDDEN; 1778 } 1779 1780 #define EL2_REG(name, acc, rst, v) { \ 1781 SYS_DESC(SYS_##name), \ 1782 .access = acc, \ 1783 .reset = rst, \ 1784 .reg = name, \ 1785 .visibility = el2_visibility, \ 1786 .val = v, \ 1787 } 1788 1789 /* 1790 * EL{0,1}2 registers are the EL2 view on an EL0 or EL1 register when 1791 * HCR_EL2.E2H==1, and only in the sysreg table for convenience of 1792 * handling traps. Given that, they are always hidden from userspace. 1793 */ 1794 static unsigned int elx2_visibility(const struct kvm_vcpu *vcpu, 1795 const struct sys_reg_desc *rd) 1796 { 1797 return REG_HIDDEN_USER; 1798 } 1799 1800 #define EL12_REG(name, acc, rst, v) { \ 1801 SYS_DESC(SYS_##name##_EL12), \ 1802 .access = acc, \ 1803 .reset = rst, \ 1804 .reg = name##_EL1, \ 1805 .val = v, \ 1806 .visibility = elx2_visibility, \ 1807 } 1808 1809 /* 1810 * Since reset() callback and field val are not used for idregs, they will be 1811 * used for specific purposes for idregs. 1812 * The reset() would return KVM sanitised register value. The value would be the 1813 * same as the host kernel sanitised value if there is no KVM sanitisation. 1814 * The val would be used as a mask indicating writable fields for the idreg. 1815 * Only bits with 1 are writable from userspace. This mask might not be 1816 * necessary in the future whenever all ID registers are enabled as writable 1817 * from userspace. 1818 */ 1819 1820 /* sys_reg_desc initialiser for known cpufeature ID registers */ 1821 #define ID_SANITISED(name) { \ 1822 SYS_DESC(SYS_##name), \ 1823 .access = access_id_reg, \ 1824 .get_user = get_id_reg, \ 1825 .set_user = set_id_reg, \ 1826 .visibility = id_visibility, \ 1827 .reset = kvm_read_sanitised_id_reg, \ 1828 .val = 0, \ 1829 } 1830 1831 /* sys_reg_desc initialiser for known cpufeature ID registers */ 1832 #define AA32_ID_SANITISED(name) { \ 1833 SYS_DESC(SYS_##name), \ 1834 .access = access_id_reg, \ 1835 .get_user = get_id_reg, \ 1836 .set_user = set_id_reg, \ 1837 .visibility = aa32_id_visibility, \ 1838 .reset = kvm_read_sanitised_id_reg, \ 1839 .val = 0, \ 1840 } 1841 1842 /* 1843 * sys_reg_desc initialiser for architecturally unallocated cpufeature ID 1844 * register with encoding Op0=3, Op1=0, CRn=0, CRm=crm, Op2=op2 1845 * (1 <= crm < 8, 0 <= Op2 < 8). 1846 */ 1847 #define ID_UNALLOCATED(crm, op2) { \ 1848 Op0(3), Op1(0), CRn(0), CRm(crm), Op2(op2), \ 1849 .access = access_id_reg, \ 1850 .get_user = get_id_reg, \ 1851 .set_user = set_id_reg, \ 1852 .visibility = raz_visibility, \ 1853 .reset = kvm_read_sanitised_id_reg, \ 1854 .val = 0, \ 1855 } 1856 1857 /* 1858 * sys_reg_desc initialiser for known ID registers that we hide from guests. 1859 * For now, these are exposed just like unallocated ID regs: they appear 1860 * RAZ for the guest. 1861 */ 1862 #define ID_HIDDEN(name) { \ 1863 SYS_DESC(SYS_##name), \ 1864 .access = access_id_reg, \ 1865 .get_user = get_id_reg, \ 1866 .set_user = set_id_reg, \ 1867 .visibility = raz_visibility, \ 1868 .reset = kvm_read_sanitised_id_reg, \ 1869 .val = 0, \ 1870 } 1871 1872 static bool access_sp_el1(struct kvm_vcpu *vcpu, 1873 struct sys_reg_params *p, 1874 const struct sys_reg_desc *r) 1875 { 1876 if (p->is_write) 1877 __vcpu_sys_reg(vcpu, SP_EL1) = p->regval; 1878 else 1879 p->regval = __vcpu_sys_reg(vcpu, SP_EL1); 1880 1881 return true; 1882 } 1883 1884 static bool access_elr(struct kvm_vcpu *vcpu, 1885 struct sys_reg_params *p, 1886 const struct sys_reg_desc *r) 1887 { 1888 if (p->is_write) 1889 vcpu_write_sys_reg(vcpu, p->regval, ELR_EL1); 1890 else 1891 p->regval = vcpu_read_sys_reg(vcpu, ELR_EL1); 1892 1893 return true; 1894 } 1895 1896 static bool access_spsr(struct kvm_vcpu *vcpu, 1897 struct sys_reg_params *p, 1898 const struct sys_reg_desc *r) 1899 { 1900 if (p->is_write) 1901 __vcpu_sys_reg(vcpu, SPSR_EL1) = p->regval; 1902 else 1903 p->regval = __vcpu_sys_reg(vcpu, SPSR_EL1); 1904 1905 return true; 1906 } 1907 1908 /* 1909 * Architected system registers. 1910 * Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2 1911 * 1912 * Debug handling: We do trap most, if not all debug related system 1913 * registers. The implementation is good enough to ensure that a guest 1914 * can use these with minimal performance degradation. The drawback is 1915 * that we don't implement any of the external debug architecture. 1916 * This should be revisited if we ever encounter a more demanding 1917 * guest... 1918 */ 1919 static const struct sys_reg_desc sys_reg_descs[] = { 1920 { SYS_DESC(SYS_DC_ISW), access_dcsw }, 1921 { SYS_DESC(SYS_DC_IGSW), access_dcgsw }, 1922 { SYS_DESC(SYS_DC_IGDSW), access_dcgsw }, 1923 { SYS_DESC(SYS_DC_CSW), access_dcsw }, 1924 { SYS_DESC(SYS_DC_CGSW), access_dcgsw }, 1925 { SYS_DESC(SYS_DC_CGDSW), access_dcgsw }, 1926 { SYS_DESC(SYS_DC_CISW), access_dcsw }, 1927 { SYS_DESC(SYS_DC_CIGSW), access_dcgsw }, 1928 { SYS_DESC(SYS_DC_CIGDSW), access_dcgsw }, 1929 1930 DBG_BCR_BVR_WCR_WVR_EL1(0), 1931 DBG_BCR_BVR_WCR_WVR_EL1(1), 1932 { SYS_DESC(SYS_MDCCINT_EL1), trap_debug_regs, reset_val, MDCCINT_EL1, 0 }, 1933 { SYS_DESC(SYS_MDSCR_EL1), trap_debug_regs, reset_val, MDSCR_EL1, 0 }, 1934 DBG_BCR_BVR_WCR_WVR_EL1(2), 1935 DBG_BCR_BVR_WCR_WVR_EL1(3), 1936 DBG_BCR_BVR_WCR_WVR_EL1(4), 1937 DBG_BCR_BVR_WCR_WVR_EL1(5), 1938 DBG_BCR_BVR_WCR_WVR_EL1(6), 1939 DBG_BCR_BVR_WCR_WVR_EL1(7), 1940 DBG_BCR_BVR_WCR_WVR_EL1(8), 1941 DBG_BCR_BVR_WCR_WVR_EL1(9), 1942 DBG_BCR_BVR_WCR_WVR_EL1(10), 1943 DBG_BCR_BVR_WCR_WVR_EL1(11), 1944 DBG_BCR_BVR_WCR_WVR_EL1(12), 1945 DBG_BCR_BVR_WCR_WVR_EL1(13), 1946 DBG_BCR_BVR_WCR_WVR_EL1(14), 1947 DBG_BCR_BVR_WCR_WVR_EL1(15), 1948 1949 { SYS_DESC(SYS_MDRAR_EL1), trap_raz_wi }, 1950 { SYS_DESC(SYS_OSLAR_EL1), trap_oslar_el1 }, 1951 { SYS_DESC(SYS_OSLSR_EL1), trap_oslsr_el1, reset_val, OSLSR_EL1, 1952 OSLSR_EL1_OSLM_IMPLEMENTED, .set_user = set_oslsr_el1, }, 1953 { SYS_DESC(SYS_OSDLR_EL1), trap_raz_wi }, 1954 { SYS_DESC(SYS_DBGPRCR_EL1), trap_raz_wi }, 1955 { SYS_DESC(SYS_DBGCLAIMSET_EL1), trap_raz_wi }, 1956 { SYS_DESC(SYS_DBGCLAIMCLR_EL1), trap_raz_wi }, 1957 { SYS_DESC(SYS_DBGAUTHSTATUS_EL1), trap_dbgauthstatus_el1 }, 1958 1959 { SYS_DESC(SYS_MDCCSR_EL0), trap_raz_wi }, 1960 { SYS_DESC(SYS_DBGDTR_EL0), trap_raz_wi }, 1961 // DBGDTR[TR]X_EL0 share the same encoding 1962 { SYS_DESC(SYS_DBGDTRTX_EL0), trap_raz_wi }, 1963 1964 { SYS_DESC(SYS_DBGVCR32_EL2), NULL, reset_val, DBGVCR32_EL2, 0 }, 1965 1966 { SYS_DESC(SYS_MPIDR_EL1), NULL, reset_mpidr, MPIDR_EL1 }, 1967 1968 /* 1969 * ID regs: all ID_SANITISED() entries here must have corresponding 1970 * entries in arm64_ftr_regs[]. 1971 */ 1972 1973 /* AArch64 mappings of the AArch32 ID registers */ 1974 /* CRm=1 */ 1975 AA32_ID_SANITISED(ID_PFR0_EL1), 1976 AA32_ID_SANITISED(ID_PFR1_EL1), 1977 { SYS_DESC(SYS_ID_DFR0_EL1), 1978 .access = access_id_reg, 1979 .get_user = get_id_reg, 1980 .set_user = set_id_dfr0_el1, 1981 .visibility = aa32_id_visibility, 1982 .reset = read_sanitised_id_dfr0_el1, 1983 .val = ID_DFR0_EL1_PerfMon_MASK, }, 1984 ID_HIDDEN(ID_AFR0_EL1), 1985 AA32_ID_SANITISED(ID_MMFR0_EL1), 1986 AA32_ID_SANITISED(ID_MMFR1_EL1), 1987 AA32_ID_SANITISED(ID_MMFR2_EL1), 1988 AA32_ID_SANITISED(ID_MMFR3_EL1), 1989 1990 /* CRm=2 */ 1991 AA32_ID_SANITISED(ID_ISAR0_EL1), 1992 AA32_ID_SANITISED(ID_ISAR1_EL1), 1993 AA32_ID_SANITISED(ID_ISAR2_EL1), 1994 AA32_ID_SANITISED(ID_ISAR3_EL1), 1995 AA32_ID_SANITISED(ID_ISAR4_EL1), 1996 AA32_ID_SANITISED(ID_ISAR5_EL1), 1997 AA32_ID_SANITISED(ID_MMFR4_EL1), 1998 AA32_ID_SANITISED(ID_ISAR6_EL1), 1999 2000 /* CRm=3 */ 2001 AA32_ID_SANITISED(MVFR0_EL1), 2002 AA32_ID_SANITISED(MVFR1_EL1), 2003 AA32_ID_SANITISED(MVFR2_EL1), 2004 ID_UNALLOCATED(3,3), 2005 AA32_ID_SANITISED(ID_PFR2_EL1), 2006 ID_HIDDEN(ID_DFR1_EL1), 2007 AA32_ID_SANITISED(ID_MMFR5_EL1), 2008 ID_UNALLOCATED(3,7), 2009 2010 /* AArch64 ID registers */ 2011 /* CRm=4 */ 2012 { SYS_DESC(SYS_ID_AA64PFR0_EL1), 2013 .access = access_id_reg, 2014 .get_user = get_id_reg, 2015 .set_user = set_id_reg, 2016 .reset = read_sanitised_id_aa64pfr0_el1, 2017 .val = ID_AA64PFR0_EL1_CSV2_MASK | ID_AA64PFR0_EL1_CSV3_MASK, }, 2018 ID_SANITISED(ID_AA64PFR1_EL1), 2019 ID_UNALLOCATED(4,2), 2020 ID_UNALLOCATED(4,3), 2021 ID_SANITISED(ID_AA64ZFR0_EL1), 2022 ID_HIDDEN(ID_AA64SMFR0_EL1), 2023 ID_UNALLOCATED(4,6), 2024 ID_UNALLOCATED(4,7), 2025 2026 /* CRm=5 */ 2027 { SYS_DESC(SYS_ID_AA64DFR0_EL1), 2028 .access = access_id_reg, 2029 .get_user = get_id_reg, 2030 .set_user = set_id_aa64dfr0_el1, 2031 .reset = read_sanitised_id_aa64dfr0_el1, 2032 .val = ID_AA64DFR0_EL1_PMUVer_MASK, }, 2033 ID_SANITISED(ID_AA64DFR1_EL1), 2034 ID_UNALLOCATED(5,2), 2035 ID_UNALLOCATED(5,3), 2036 ID_HIDDEN(ID_AA64AFR0_EL1), 2037 ID_HIDDEN(ID_AA64AFR1_EL1), 2038 ID_UNALLOCATED(5,6), 2039 ID_UNALLOCATED(5,7), 2040 2041 /* CRm=6 */ 2042 ID_SANITISED(ID_AA64ISAR0_EL1), 2043 ID_SANITISED(ID_AA64ISAR1_EL1), 2044 ID_SANITISED(ID_AA64ISAR2_EL1), 2045 ID_UNALLOCATED(6,3), 2046 ID_UNALLOCATED(6,4), 2047 ID_UNALLOCATED(6,5), 2048 ID_UNALLOCATED(6,6), 2049 ID_UNALLOCATED(6,7), 2050 2051 /* CRm=7 */ 2052 ID_SANITISED(ID_AA64MMFR0_EL1), 2053 ID_SANITISED(ID_AA64MMFR1_EL1), 2054 ID_SANITISED(ID_AA64MMFR2_EL1), 2055 ID_SANITISED(ID_AA64MMFR3_EL1), 2056 ID_UNALLOCATED(7,4), 2057 ID_UNALLOCATED(7,5), 2058 ID_UNALLOCATED(7,6), 2059 ID_UNALLOCATED(7,7), 2060 2061 { SYS_DESC(SYS_SCTLR_EL1), access_vm_reg, reset_val, SCTLR_EL1, 0x00C50078 }, 2062 { SYS_DESC(SYS_ACTLR_EL1), access_actlr, reset_actlr, ACTLR_EL1 }, 2063 { SYS_DESC(SYS_CPACR_EL1), NULL, reset_val, CPACR_EL1, 0 }, 2064 2065 MTE_REG(RGSR_EL1), 2066 MTE_REG(GCR_EL1), 2067 2068 { SYS_DESC(SYS_ZCR_EL1), NULL, reset_val, ZCR_EL1, 0, .visibility = sve_visibility }, 2069 { SYS_DESC(SYS_TRFCR_EL1), undef_access }, 2070 { SYS_DESC(SYS_SMPRI_EL1), undef_access }, 2071 { SYS_DESC(SYS_SMCR_EL1), undef_access }, 2072 { SYS_DESC(SYS_TTBR0_EL1), access_vm_reg, reset_unknown, TTBR0_EL1 }, 2073 { SYS_DESC(SYS_TTBR1_EL1), access_vm_reg, reset_unknown, TTBR1_EL1 }, 2074 { SYS_DESC(SYS_TCR_EL1), access_vm_reg, reset_val, TCR_EL1, 0 }, 2075 { SYS_DESC(SYS_TCR2_EL1), access_vm_reg, reset_val, TCR2_EL1, 0 }, 2076 2077 PTRAUTH_KEY(APIA), 2078 PTRAUTH_KEY(APIB), 2079 PTRAUTH_KEY(APDA), 2080 PTRAUTH_KEY(APDB), 2081 PTRAUTH_KEY(APGA), 2082 2083 { SYS_DESC(SYS_SPSR_EL1), access_spsr}, 2084 { SYS_DESC(SYS_ELR_EL1), access_elr}, 2085 2086 { SYS_DESC(SYS_AFSR0_EL1), access_vm_reg, reset_unknown, AFSR0_EL1 }, 2087 { SYS_DESC(SYS_AFSR1_EL1), access_vm_reg, reset_unknown, AFSR1_EL1 }, 2088 { SYS_DESC(SYS_ESR_EL1), access_vm_reg, reset_unknown, ESR_EL1 }, 2089 2090 { SYS_DESC(SYS_ERRIDR_EL1), trap_raz_wi }, 2091 { SYS_DESC(SYS_ERRSELR_EL1), trap_raz_wi }, 2092 { SYS_DESC(SYS_ERXFR_EL1), trap_raz_wi }, 2093 { SYS_DESC(SYS_ERXCTLR_EL1), trap_raz_wi }, 2094 { SYS_DESC(SYS_ERXSTATUS_EL1), trap_raz_wi }, 2095 { SYS_DESC(SYS_ERXADDR_EL1), trap_raz_wi }, 2096 { SYS_DESC(SYS_ERXMISC0_EL1), trap_raz_wi }, 2097 { SYS_DESC(SYS_ERXMISC1_EL1), trap_raz_wi }, 2098 2099 MTE_REG(TFSR_EL1), 2100 MTE_REG(TFSRE0_EL1), 2101 2102 { SYS_DESC(SYS_FAR_EL1), access_vm_reg, reset_unknown, FAR_EL1 }, 2103 { SYS_DESC(SYS_PAR_EL1), NULL, reset_unknown, PAR_EL1 }, 2104 2105 { SYS_DESC(SYS_PMSCR_EL1), undef_access }, 2106 { SYS_DESC(SYS_PMSNEVFR_EL1), undef_access }, 2107 { SYS_DESC(SYS_PMSICR_EL1), undef_access }, 2108 { SYS_DESC(SYS_PMSIRR_EL1), undef_access }, 2109 { SYS_DESC(SYS_PMSFCR_EL1), undef_access }, 2110 { SYS_DESC(SYS_PMSEVFR_EL1), undef_access }, 2111 { SYS_DESC(SYS_PMSLATFR_EL1), undef_access }, 2112 { SYS_DESC(SYS_PMSIDR_EL1), undef_access }, 2113 { SYS_DESC(SYS_PMBLIMITR_EL1), undef_access }, 2114 { SYS_DESC(SYS_PMBPTR_EL1), undef_access }, 2115 { SYS_DESC(SYS_PMBSR_EL1), undef_access }, 2116 /* PMBIDR_EL1 is not trapped */ 2117 2118 { PMU_SYS_REG(PMINTENSET_EL1), 2119 .access = access_pminten, .reg = PMINTENSET_EL1 }, 2120 { PMU_SYS_REG(PMINTENCLR_EL1), 2121 .access = access_pminten, .reg = PMINTENSET_EL1 }, 2122 { SYS_DESC(SYS_PMMIR_EL1), trap_raz_wi }, 2123 2124 { SYS_DESC(SYS_MAIR_EL1), access_vm_reg, reset_unknown, MAIR_EL1 }, 2125 { SYS_DESC(SYS_PIRE0_EL1), access_vm_reg, reset_unknown, PIRE0_EL1 }, 2126 { SYS_DESC(SYS_PIR_EL1), access_vm_reg, reset_unknown, PIR_EL1 }, 2127 { SYS_DESC(SYS_AMAIR_EL1), access_vm_reg, reset_amair_el1, AMAIR_EL1 }, 2128 2129 { SYS_DESC(SYS_LORSA_EL1), trap_loregion }, 2130 { SYS_DESC(SYS_LOREA_EL1), trap_loregion }, 2131 { SYS_DESC(SYS_LORN_EL1), trap_loregion }, 2132 { SYS_DESC(SYS_LORC_EL1), trap_loregion }, 2133 { SYS_DESC(SYS_LORID_EL1), trap_loregion }, 2134 2135 { SYS_DESC(SYS_VBAR_EL1), access_rw, reset_val, VBAR_EL1, 0 }, 2136 { SYS_DESC(SYS_DISR_EL1), NULL, reset_val, DISR_EL1, 0 }, 2137 2138 { SYS_DESC(SYS_ICC_IAR0_EL1), write_to_read_only }, 2139 { SYS_DESC(SYS_ICC_EOIR0_EL1), read_from_write_only }, 2140 { SYS_DESC(SYS_ICC_HPPIR0_EL1), write_to_read_only }, 2141 { SYS_DESC(SYS_ICC_DIR_EL1), read_from_write_only }, 2142 { SYS_DESC(SYS_ICC_RPR_EL1), write_to_read_only }, 2143 { SYS_DESC(SYS_ICC_SGI1R_EL1), access_gic_sgi }, 2144 { SYS_DESC(SYS_ICC_ASGI1R_EL1), access_gic_sgi }, 2145 { SYS_DESC(SYS_ICC_SGI0R_EL1), access_gic_sgi }, 2146 { SYS_DESC(SYS_ICC_IAR1_EL1), write_to_read_only }, 2147 { SYS_DESC(SYS_ICC_EOIR1_EL1), read_from_write_only }, 2148 { SYS_DESC(SYS_ICC_HPPIR1_EL1), write_to_read_only }, 2149 { SYS_DESC(SYS_ICC_SRE_EL1), access_gic_sre }, 2150 2151 { SYS_DESC(SYS_CONTEXTIDR_EL1), access_vm_reg, reset_val, CONTEXTIDR_EL1, 0 }, 2152 { SYS_DESC(SYS_TPIDR_EL1), NULL, reset_unknown, TPIDR_EL1 }, 2153 2154 { SYS_DESC(SYS_SCXTNUM_EL1), undef_access }, 2155 2156 { SYS_DESC(SYS_CNTKCTL_EL1), NULL, reset_val, CNTKCTL_EL1, 0}, 2157 2158 { SYS_DESC(SYS_CCSIDR_EL1), access_ccsidr }, 2159 { SYS_DESC(SYS_CLIDR_EL1), access_clidr, reset_clidr, CLIDR_EL1, 2160 .set_user = set_clidr }, 2161 { SYS_DESC(SYS_CCSIDR2_EL1), undef_access }, 2162 { SYS_DESC(SYS_SMIDR_EL1), undef_access }, 2163 { SYS_DESC(SYS_CSSELR_EL1), access_csselr, reset_unknown, CSSELR_EL1 }, 2164 { SYS_DESC(SYS_CTR_EL0), access_ctr }, 2165 { SYS_DESC(SYS_SVCR), undef_access }, 2166 2167 { PMU_SYS_REG(PMCR_EL0), .access = access_pmcr, 2168 .reset = reset_pmcr, .reg = PMCR_EL0 }, 2169 { PMU_SYS_REG(PMCNTENSET_EL0), 2170 .access = access_pmcnten, .reg = PMCNTENSET_EL0 }, 2171 { PMU_SYS_REG(PMCNTENCLR_EL0), 2172 .access = access_pmcnten, .reg = PMCNTENSET_EL0 }, 2173 { PMU_SYS_REG(PMOVSCLR_EL0), 2174 .access = access_pmovs, .reg = PMOVSSET_EL0 }, 2175 /* 2176 * PM_SWINC_EL0 is exposed to userspace as RAZ/WI, as it was 2177 * previously (and pointlessly) advertised in the past... 2178 */ 2179 { PMU_SYS_REG(PMSWINC_EL0), 2180 .get_user = get_raz_reg, .set_user = set_wi_reg, 2181 .access = access_pmswinc, .reset = NULL }, 2182 { PMU_SYS_REG(PMSELR_EL0), 2183 .access = access_pmselr, .reset = reset_pmselr, .reg = PMSELR_EL0 }, 2184 { PMU_SYS_REG(PMCEID0_EL0), 2185 .access = access_pmceid, .reset = NULL }, 2186 { PMU_SYS_REG(PMCEID1_EL0), 2187 .access = access_pmceid, .reset = NULL }, 2188 { PMU_SYS_REG(PMCCNTR_EL0), 2189 .access = access_pmu_evcntr, .reset = reset_unknown, 2190 .reg = PMCCNTR_EL0, .get_user = get_pmu_evcntr}, 2191 { PMU_SYS_REG(PMXEVTYPER_EL0), 2192 .access = access_pmu_evtyper, .reset = NULL }, 2193 { PMU_SYS_REG(PMXEVCNTR_EL0), 2194 .access = access_pmu_evcntr, .reset = NULL }, 2195 /* 2196 * PMUSERENR_EL0 resets as unknown in 64bit mode while it resets as zero 2197 * in 32bit mode. Here we choose to reset it as zero for consistency. 2198 */ 2199 { PMU_SYS_REG(PMUSERENR_EL0), .access = access_pmuserenr, 2200 .reset = reset_val, .reg = PMUSERENR_EL0, .val = 0 }, 2201 { PMU_SYS_REG(PMOVSSET_EL0), 2202 .access = access_pmovs, .reg = PMOVSSET_EL0 }, 2203 2204 { SYS_DESC(SYS_TPIDR_EL0), NULL, reset_unknown, TPIDR_EL0 }, 2205 { SYS_DESC(SYS_TPIDRRO_EL0), NULL, reset_unknown, TPIDRRO_EL0 }, 2206 { SYS_DESC(SYS_TPIDR2_EL0), undef_access }, 2207 2208 { SYS_DESC(SYS_SCXTNUM_EL0), undef_access }, 2209 2210 { SYS_DESC(SYS_AMCR_EL0), undef_access }, 2211 { SYS_DESC(SYS_AMCFGR_EL0), undef_access }, 2212 { SYS_DESC(SYS_AMCGCR_EL0), undef_access }, 2213 { SYS_DESC(SYS_AMUSERENR_EL0), undef_access }, 2214 { SYS_DESC(SYS_AMCNTENCLR0_EL0), undef_access }, 2215 { SYS_DESC(SYS_AMCNTENSET0_EL0), undef_access }, 2216 { SYS_DESC(SYS_AMCNTENCLR1_EL0), undef_access }, 2217 { SYS_DESC(SYS_AMCNTENSET1_EL0), undef_access }, 2218 AMU_AMEVCNTR0_EL0(0), 2219 AMU_AMEVCNTR0_EL0(1), 2220 AMU_AMEVCNTR0_EL0(2), 2221 AMU_AMEVCNTR0_EL0(3), 2222 AMU_AMEVCNTR0_EL0(4), 2223 AMU_AMEVCNTR0_EL0(5), 2224 AMU_AMEVCNTR0_EL0(6), 2225 AMU_AMEVCNTR0_EL0(7), 2226 AMU_AMEVCNTR0_EL0(8), 2227 AMU_AMEVCNTR0_EL0(9), 2228 AMU_AMEVCNTR0_EL0(10), 2229 AMU_AMEVCNTR0_EL0(11), 2230 AMU_AMEVCNTR0_EL0(12), 2231 AMU_AMEVCNTR0_EL0(13), 2232 AMU_AMEVCNTR0_EL0(14), 2233 AMU_AMEVCNTR0_EL0(15), 2234 AMU_AMEVTYPER0_EL0(0), 2235 AMU_AMEVTYPER0_EL0(1), 2236 AMU_AMEVTYPER0_EL0(2), 2237 AMU_AMEVTYPER0_EL0(3), 2238 AMU_AMEVTYPER0_EL0(4), 2239 AMU_AMEVTYPER0_EL0(5), 2240 AMU_AMEVTYPER0_EL0(6), 2241 AMU_AMEVTYPER0_EL0(7), 2242 AMU_AMEVTYPER0_EL0(8), 2243 AMU_AMEVTYPER0_EL0(9), 2244 AMU_AMEVTYPER0_EL0(10), 2245 AMU_AMEVTYPER0_EL0(11), 2246 AMU_AMEVTYPER0_EL0(12), 2247 AMU_AMEVTYPER0_EL0(13), 2248 AMU_AMEVTYPER0_EL0(14), 2249 AMU_AMEVTYPER0_EL0(15), 2250 AMU_AMEVCNTR1_EL0(0), 2251 AMU_AMEVCNTR1_EL0(1), 2252 AMU_AMEVCNTR1_EL0(2), 2253 AMU_AMEVCNTR1_EL0(3), 2254 AMU_AMEVCNTR1_EL0(4), 2255 AMU_AMEVCNTR1_EL0(5), 2256 AMU_AMEVCNTR1_EL0(6), 2257 AMU_AMEVCNTR1_EL0(7), 2258 AMU_AMEVCNTR1_EL0(8), 2259 AMU_AMEVCNTR1_EL0(9), 2260 AMU_AMEVCNTR1_EL0(10), 2261 AMU_AMEVCNTR1_EL0(11), 2262 AMU_AMEVCNTR1_EL0(12), 2263 AMU_AMEVCNTR1_EL0(13), 2264 AMU_AMEVCNTR1_EL0(14), 2265 AMU_AMEVCNTR1_EL0(15), 2266 AMU_AMEVTYPER1_EL0(0), 2267 AMU_AMEVTYPER1_EL0(1), 2268 AMU_AMEVTYPER1_EL0(2), 2269 AMU_AMEVTYPER1_EL0(3), 2270 AMU_AMEVTYPER1_EL0(4), 2271 AMU_AMEVTYPER1_EL0(5), 2272 AMU_AMEVTYPER1_EL0(6), 2273 AMU_AMEVTYPER1_EL0(7), 2274 AMU_AMEVTYPER1_EL0(8), 2275 AMU_AMEVTYPER1_EL0(9), 2276 AMU_AMEVTYPER1_EL0(10), 2277 AMU_AMEVTYPER1_EL0(11), 2278 AMU_AMEVTYPER1_EL0(12), 2279 AMU_AMEVTYPER1_EL0(13), 2280 AMU_AMEVTYPER1_EL0(14), 2281 AMU_AMEVTYPER1_EL0(15), 2282 2283 { SYS_DESC(SYS_CNTPCT_EL0), access_arch_timer }, 2284 { SYS_DESC(SYS_CNTPCTSS_EL0), access_arch_timer }, 2285 { SYS_DESC(SYS_CNTP_TVAL_EL0), access_arch_timer }, 2286 { SYS_DESC(SYS_CNTP_CTL_EL0), access_arch_timer }, 2287 { SYS_DESC(SYS_CNTP_CVAL_EL0), access_arch_timer }, 2288 2289 /* PMEVCNTRn_EL0 */ 2290 PMU_PMEVCNTR_EL0(0), 2291 PMU_PMEVCNTR_EL0(1), 2292 PMU_PMEVCNTR_EL0(2), 2293 PMU_PMEVCNTR_EL0(3), 2294 PMU_PMEVCNTR_EL0(4), 2295 PMU_PMEVCNTR_EL0(5), 2296 PMU_PMEVCNTR_EL0(6), 2297 PMU_PMEVCNTR_EL0(7), 2298 PMU_PMEVCNTR_EL0(8), 2299 PMU_PMEVCNTR_EL0(9), 2300 PMU_PMEVCNTR_EL0(10), 2301 PMU_PMEVCNTR_EL0(11), 2302 PMU_PMEVCNTR_EL0(12), 2303 PMU_PMEVCNTR_EL0(13), 2304 PMU_PMEVCNTR_EL0(14), 2305 PMU_PMEVCNTR_EL0(15), 2306 PMU_PMEVCNTR_EL0(16), 2307 PMU_PMEVCNTR_EL0(17), 2308 PMU_PMEVCNTR_EL0(18), 2309 PMU_PMEVCNTR_EL0(19), 2310 PMU_PMEVCNTR_EL0(20), 2311 PMU_PMEVCNTR_EL0(21), 2312 PMU_PMEVCNTR_EL0(22), 2313 PMU_PMEVCNTR_EL0(23), 2314 PMU_PMEVCNTR_EL0(24), 2315 PMU_PMEVCNTR_EL0(25), 2316 PMU_PMEVCNTR_EL0(26), 2317 PMU_PMEVCNTR_EL0(27), 2318 PMU_PMEVCNTR_EL0(28), 2319 PMU_PMEVCNTR_EL0(29), 2320 PMU_PMEVCNTR_EL0(30), 2321 /* PMEVTYPERn_EL0 */ 2322 PMU_PMEVTYPER_EL0(0), 2323 PMU_PMEVTYPER_EL0(1), 2324 PMU_PMEVTYPER_EL0(2), 2325 PMU_PMEVTYPER_EL0(3), 2326 PMU_PMEVTYPER_EL0(4), 2327 PMU_PMEVTYPER_EL0(5), 2328 PMU_PMEVTYPER_EL0(6), 2329 PMU_PMEVTYPER_EL0(7), 2330 PMU_PMEVTYPER_EL0(8), 2331 PMU_PMEVTYPER_EL0(9), 2332 PMU_PMEVTYPER_EL0(10), 2333 PMU_PMEVTYPER_EL0(11), 2334 PMU_PMEVTYPER_EL0(12), 2335 PMU_PMEVTYPER_EL0(13), 2336 PMU_PMEVTYPER_EL0(14), 2337 PMU_PMEVTYPER_EL0(15), 2338 PMU_PMEVTYPER_EL0(16), 2339 PMU_PMEVTYPER_EL0(17), 2340 PMU_PMEVTYPER_EL0(18), 2341 PMU_PMEVTYPER_EL0(19), 2342 PMU_PMEVTYPER_EL0(20), 2343 PMU_PMEVTYPER_EL0(21), 2344 PMU_PMEVTYPER_EL0(22), 2345 PMU_PMEVTYPER_EL0(23), 2346 PMU_PMEVTYPER_EL0(24), 2347 PMU_PMEVTYPER_EL0(25), 2348 PMU_PMEVTYPER_EL0(26), 2349 PMU_PMEVTYPER_EL0(27), 2350 PMU_PMEVTYPER_EL0(28), 2351 PMU_PMEVTYPER_EL0(29), 2352 PMU_PMEVTYPER_EL0(30), 2353 /* 2354 * PMCCFILTR_EL0 resets as unknown in 64bit mode while it resets as zero 2355 * in 32bit mode. Here we choose to reset it as zero for consistency. 2356 */ 2357 { PMU_SYS_REG(PMCCFILTR_EL0), .access = access_pmu_evtyper, 2358 .reset = reset_val, .reg = PMCCFILTR_EL0, .val = 0 }, 2359 2360 EL2_REG(VPIDR_EL2, access_rw, reset_unknown, 0), 2361 EL2_REG(VMPIDR_EL2, access_rw, reset_unknown, 0), 2362 EL2_REG(SCTLR_EL2, access_rw, reset_val, SCTLR_EL2_RES1), 2363 EL2_REG(ACTLR_EL2, access_rw, reset_val, 0), 2364 EL2_REG(HCR_EL2, access_rw, reset_val, 0), 2365 EL2_REG(MDCR_EL2, access_rw, reset_val, 0), 2366 EL2_REG(CPTR_EL2, access_rw, reset_val, CPTR_NVHE_EL2_RES1), 2367 EL2_REG(HSTR_EL2, access_rw, reset_val, 0), 2368 EL2_REG(HACR_EL2, access_rw, reset_val, 0), 2369 2370 EL2_REG(TTBR0_EL2, access_rw, reset_val, 0), 2371 EL2_REG(TTBR1_EL2, access_rw, reset_val, 0), 2372 EL2_REG(TCR_EL2, access_rw, reset_val, TCR_EL2_RES1), 2373 EL2_REG(VTTBR_EL2, access_rw, reset_val, 0), 2374 EL2_REG(VTCR_EL2, access_rw, reset_val, 0), 2375 2376 { SYS_DESC(SYS_DACR32_EL2), NULL, reset_unknown, DACR32_EL2 }, 2377 EL2_REG(SPSR_EL2, access_rw, reset_val, 0), 2378 EL2_REG(ELR_EL2, access_rw, reset_val, 0), 2379 { SYS_DESC(SYS_SP_EL1), access_sp_el1}, 2380 2381 { SYS_DESC(SYS_IFSR32_EL2), NULL, reset_unknown, IFSR32_EL2 }, 2382 EL2_REG(AFSR0_EL2, access_rw, reset_val, 0), 2383 EL2_REG(AFSR1_EL2, access_rw, reset_val, 0), 2384 EL2_REG(ESR_EL2, access_rw, reset_val, 0), 2385 { SYS_DESC(SYS_FPEXC32_EL2), NULL, reset_val, FPEXC32_EL2, 0x700 }, 2386 2387 EL2_REG(FAR_EL2, access_rw, reset_val, 0), 2388 EL2_REG(HPFAR_EL2, access_rw, reset_val, 0), 2389 2390 EL2_REG(MAIR_EL2, access_rw, reset_val, 0), 2391 EL2_REG(AMAIR_EL2, access_rw, reset_val, 0), 2392 2393 EL2_REG(VBAR_EL2, access_rw, reset_val, 0), 2394 EL2_REG(RVBAR_EL2, access_rw, reset_val, 0), 2395 { SYS_DESC(SYS_RMR_EL2), trap_undef }, 2396 2397 EL2_REG(CONTEXTIDR_EL2, access_rw, reset_val, 0), 2398 EL2_REG(TPIDR_EL2, access_rw, reset_val, 0), 2399 2400 EL2_REG(CNTVOFF_EL2, access_rw, reset_val, 0), 2401 EL2_REG(CNTHCTL_EL2, access_rw, reset_val, 0), 2402 2403 EL12_REG(SCTLR, access_vm_reg, reset_val, 0x00C50078), 2404 EL12_REG(CPACR, access_rw, reset_val, 0), 2405 EL12_REG(TTBR0, access_vm_reg, reset_unknown, 0), 2406 EL12_REG(TTBR1, access_vm_reg, reset_unknown, 0), 2407 EL12_REG(TCR, access_vm_reg, reset_val, 0), 2408 { SYS_DESC(SYS_SPSR_EL12), access_spsr}, 2409 { SYS_DESC(SYS_ELR_EL12), access_elr}, 2410 EL12_REG(AFSR0, access_vm_reg, reset_unknown, 0), 2411 EL12_REG(AFSR1, access_vm_reg, reset_unknown, 0), 2412 EL12_REG(ESR, access_vm_reg, reset_unknown, 0), 2413 EL12_REG(FAR, access_vm_reg, reset_unknown, 0), 2414 EL12_REG(MAIR, access_vm_reg, reset_unknown, 0), 2415 EL12_REG(AMAIR, access_vm_reg, reset_amair_el1, 0), 2416 EL12_REG(VBAR, access_rw, reset_val, 0), 2417 EL12_REG(CONTEXTIDR, access_vm_reg, reset_val, 0), 2418 EL12_REG(CNTKCTL, access_rw, reset_val, 0), 2419 2420 EL2_REG(SP_EL2, NULL, reset_unknown, 0), 2421 }; 2422 2423 static const struct sys_reg_desc *first_idreg; 2424 2425 static bool trap_dbgdidr(struct kvm_vcpu *vcpu, 2426 struct sys_reg_params *p, 2427 const struct sys_reg_desc *r) 2428 { 2429 if (p->is_write) { 2430 return ignore_write(vcpu, p); 2431 } else { 2432 u64 dfr = read_sanitised_ftr_reg(SYS_ID_AA64DFR0_EL1); 2433 u64 pfr = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1); 2434 u32 el3 = !!cpuid_feature_extract_unsigned_field(pfr, ID_AA64PFR0_EL1_EL3_SHIFT); 2435 2436 p->regval = ((((dfr >> ID_AA64DFR0_EL1_WRPs_SHIFT) & 0xf) << 28) | 2437 (((dfr >> ID_AA64DFR0_EL1_BRPs_SHIFT) & 0xf) << 24) | 2438 (((dfr >> ID_AA64DFR0_EL1_CTX_CMPs_SHIFT) & 0xf) << 20) 2439 | (6 << 16) | (1 << 15) | (el3 << 14) | (el3 << 12)); 2440 return true; 2441 } 2442 } 2443 2444 /* 2445 * AArch32 debug register mappings 2446 * 2447 * AArch32 DBGBVRn is mapped to DBGBVRn_EL1[31:0] 2448 * AArch32 DBGBXVRn is mapped to DBGBVRn_EL1[63:32] 2449 * 2450 * None of the other registers share their location, so treat them as 2451 * if they were 64bit. 2452 */ 2453 #define DBG_BCR_BVR_WCR_WVR(n) \ 2454 /* DBGBVRn */ \ 2455 { AA32(LO), Op1( 0), CRn( 0), CRm((n)), Op2( 4), trap_bvr, NULL, n }, \ 2456 /* DBGBCRn */ \ 2457 { Op1( 0), CRn( 0), CRm((n)), Op2( 5), trap_bcr, NULL, n }, \ 2458 /* DBGWVRn */ \ 2459 { Op1( 0), CRn( 0), CRm((n)), Op2( 6), trap_wvr, NULL, n }, \ 2460 /* DBGWCRn */ \ 2461 { Op1( 0), CRn( 0), CRm((n)), Op2( 7), trap_wcr, NULL, n } 2462 2463 #define DBGBXVR(n) \ 2464 { AA32(HI), Op1( 0), CRn( 1), CRm((n)), Op2( 1), trap_bvr, NULL, n } 2465 2466 /* 2467 * Trapped cp14 registers. We generally ignore most of the external 2468 * debug, on the principle that they don't really make sense to a 2469 * guest. Revisit this one day, would this principle change. 2470 */ 2471 static const struct sys_reg_desc cp14_regs[] = { 2472 /* DBGDIDR */ 2473 { Op1( 0), CRn( 0), CRm( 0), Op2( 0), trap_dbgdidr }, 2474 /* DBGDTRRXext */ 2475 { Op1( 0), CRn( 0), CRm( 0), Op2( 2), trap_raz_wi }, 2476 2477 DBG_BCR_BVR_WCR_WVR(0), 2478 /* DBGDSCRint */ 2479 { Op1( 0), CRn( 0), CRm( 1), Op2( 0), trap_raz_wi }, 2480 DBG_BCR_BVR_WCR_WVR(1), 2481 /* DBGDCCINT */ 2482 { Op1( 0), CRn( 0), CRm( 2), Op2( 0), trap_debug_regs, NULL, MDCCINT_EL1 }, 2483 /* DBGDSCRext */ 2484 { Op1( 0), CRn( 0), CRm( 2), Op2( 2), trap_debug_regs, NULL, MDSCR_EL1 }, 2485 DBG_BCR_BVR_WCR_WVR(2), 2486 /* DBGDTR[RT]Xint */ 2487 { Op1( 0), CRn( 0), CRm( 3), Op2( 0), trap_raz_wi }, 2488 /* DBGDTR[RT]Xext */ 2489 { Op1( 0), CRn( 0), CRm( 3), Op2( 2), trap_raz_wi }, 2490 DBG_BCR_BVR_WCR_WVR(3), 2491 DBG_BCR_BVR_WCR_WVR(4), 2492 DBG_BCR_BVR_WCR_WVR(5), 2493 /* DBGWFAR */ 2494 { Op1( 0), CRn( 0), CRm( 6), Op2( 0), trap_raz_wi }, 2495 /* DBGOSECCR */ 2496 { Op1( 0), CRn( 0), CRm( 6), Op2( 2), trap_raz_wi }, 2497 DBG_BCR_BVR_WCR_WVR(6), 2498 /* DBGVCR */ 2499 { Op1( 0), CRn( 0), CRm( 7), Op2( 0), trap_debug_regs, NULL, DBGVCR32_EL2 }, 2500 DBG_BCR_BVR_WCR_WVR(7), 2501 DBG_BCR_BVR_WCR_WVR(8), 2502 DBG_BCR_BVR_WCR_WVR(9), 2503 DBG_BCR_BVR_WCR_WVR(10), 2504 DBG_BCR_BVR_WCR_WVR(11), 2505 DBG_BCR_BVR_WCR_WVR(12), 2506 DBG_BCR_BVR_WCR_WVR(13), 2507 DBG_BCR_BVR_WCR_WVR(14), 2508 DBG_BCR_BVR_WCR_WVR(15), 2509 2510 /* DBGDRAR (32bit) */ 2511 { Op1( 0), CRn( 1), CRm( 0), Op2( 0), trap_raz_wi }, 2512 2513 DBGBXVR(0), 2514 /* DBGOSLAR */ 2515 { Op1( 0), CRn( 1), CRm( 0), Op2( 4), trap_oslar_el1 }, 2516 DBGBXVR(1), 2517 /* DBGOSLSR */ 2518 { Op1( 0), CRn( 1), CRm( 1), Op2( 4), trap_oslsr_el1, NULL, OSLSR_EL1 }, 2519 DBGBXVR(2), 2520 DBGBXVR(3), 2521 /* DBGOSDLR */ 2522 { Op1( 0), CRn( 1), CRm( 3), Op2( 4), trap_raz_wi }, 2523 DBGBXVR(4), 2524 /* DBGPRCR */ 2525 { Op1( 0), CRn( 1), CRm( 4), Op2( 4), trap_raz_wi }, 2526 DBGBXVR(5), 2527 DBGBXVR(6), 2528 DBGBXVR(7), 2529 DBGBXVR(8), 2530 DBGBXVR(9), 2531 DBGBXVR(10), 2532 DBGBXVR(11), 2533 DBGBXVR(12), 2534 DBGBXVR(13), 2535 DBGBXVR(14), 2536 DBGBXVR(15), 2537 2538 /* DBGDSAR (32bit) */ 2539 { Op1( 0), CRn( 2), CRm( 0), Op2( 0), trap_raz_wi }, 2540 2541 /* DBGDEVID2 */ 2542 { Op1( 0), CRn( 7), CRm( 0), Op2( 7), trap_raz_wi }, 2543 /* DBGDEVID1 */ 2544 { Op1( 0), CRn( 7), CRm( 1), Op2( 7), trap_raz_wi }, 2545 /* DBGDEVID */ 2546 { Op1( 0), CRn( 7), CRm( 2), Op2( 7), trap_raz_wi }, 2547 /* DBGCLAIMSET */ 2548 { Op1( 0), CRn( 7), CRm( 8), Op2( 6), trap_raz_wi }, 2549 /* DBGCLAIMCLR */ 2550 { Op1( 0), CRn( 7), CRm( 9), Op2( 6), trap_raz_wi }, 2551 /* DBGAUTHSTATUS */ 2552 { Op1( 0), CRn( 7), CRm(14), Op2( 6), trap_dbgauthstatus_el1 }, 2553 }; 2554 2555 /* Trapped cp14 64bit registers */ 2556 static const struct sys_reg_desc cp14_64_regs[] = { 2557 /* DBGDRAR (64bit) */ 2558 { Op1( 0), CRm( 1), .access = trap_raz_wi }, 2559 2560 /* DBGDSAR (64bit) */ 2561 { Op1( 0), CRm( 2), .access = trap_raz_wi }, 2562 }; 2563 2564 #define CP15_PMU_SYS_REG(_map, _Op1, _CRn, _CRm, _Op2) \ 2565 AA32(_map), \ 2566 Op1(_Op1), CRn(_CRn), CRm(_CRm), Op2(_Op2), \ 2567 .visibility = pmu_visibility 2568 2569 /* Macro to expand the PMEVCNTRn register */ 2570 #define PMU_PMEVCNTR(n) \ 2571 { CP15_PMU_SYS_REG(DIRECT, 0, 0b1110, \ 2572 (0b1000 | (((n) >> 3) & 0x3)), ((n) & 0x7)), \ 2573 .access = access_pmu_evcntr } 2574 2575 /* Macro to expand the PMEVTYPERn register */ 2576 #define PMU_PMEVTYPER(n) \ 2577 { CP15_PMU_SYS_REG(DIRECT, 0, 0b1110, \ 2578 (0b1100 | (((n) >> 3) & 0x3)), ((n) & 0x7)), \ 2579 .access = access_pmu_evtyper } 2580 /* 2581 * Trapped cp15 registers. TTBR0/TTBR1 get a double encoding, 2582 * depending on the way they are accessed (as a 32bit or a 64bit 2583 * register). 2584 */ 2585 static const struct sys_reg_desc cp15_regs[] = { 2586 { Op1( 0), CRn( 0), CRm( 0), Op2( 1), access_ctr }, 2587 { Op1( 0), CRn( 1), CRm( 0), Op2( 0), access_vm_reg, NULL, SCTLR_EL1 }, 2588 /* ACTLR */ 2589 { AA32(LO), Op1( 0), CRn( 1), CRm( 0), Op2( 1), access_actlr, NULL, ACTLR_EL1 }, 2590 /* ACTLR2 */ 2591 { AA32(HI), Op1( 0), CRn( 1), CRm( 0), Op2( 3), access_actlr, NULL, ACTLR_EL1 }, 2592 { Op1( 0), CRn( 2), CRm( 0), Op2( 0), access_vm_reg, NULL, TTBR0_EL1 }, 2593 { Op1( 0), CRn( 2), CRm( 0), Op2( 1), access_vm_reg, NULL, TTBR1_EL1 }, 2594 /* TTBCR */ 2595 { AA32(LO), Op1( 0), CRn( 2), CRm( 0), Op2( 2), access_vm_reg, NULL, TCR_EL1 }, 2596 /* TTBCR2 */ 2597 { AA32(HI), Op1( 0), CRn( 2), CRm( 0), Op2( 3), access_vm_reg, NULL, TCR_EL1 }, 2598 { Op1( 0), CRn( 3), CRm( 0), Op2( 0), access_vm_reg, NULL, DACR32_EL2 }, 2599 /* DFSR */ 2600 { Op1( 0), CRn( 5), CRm( 0), Op2( 0), access_vm_reg, NULL, ESR_EL1 }, 2601 { Op1( 0), CRn( 5), CRm( 0), Op2( 1), access_vm_reg, NULL, IFSR32_EL2 }, 2602 /* ADFSR */ 2603 { Op1( 0), CRn( 5), CRm( 1), Op2( 0), access_vm_reg, NULL, AFSR0_EL1 }, 2604 /* AIFSR */ 2605 { Op1( 0), CRn( 5), CRm( 1), Op2( 1), access_vm_reg, NULL, AFSR1_EL1 }, 2606 /* DFAR */ 2607 { AA32(LO), Op1( 0), CRn( 6), CRm( 0), Op2( 0), access_vm_reg, NULL, FAR_EL1 }, 2608 /* IFAR */ 2609 { AA32(HI), Op1( 0), CRn( 6), CRm( 0), Op2( 2), access_vm_reg, NULL, FAR_EL1 }, 2610 2611 /* 2612 * DC{C,I,CI}SW operations: 2613 */ 2614 { Op1( 0), CRn( 7), CRm( 6), Op2( 2), access_dcsw }, 2615 { Op1( 0), CRn( 7), CRm(10), Op2( 2), access_dcsw }, 2616 { Op1( 0), CRn( 7), CRm(14), Op2( 2), access_dcsw }, 2617 2618 /* PMU */ 2619 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 0), .access = access_pmcr }, 2620 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 1), .access = access_pmcnten }, 2621 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 2), .access = access_pmcnten }, 2622 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 3), .access = access_pmovs }, 2623 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 4), .access = access_pmswinc }, 2624 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 5), .access = access_pmselr }, 2625 { CP15_PMU_SYS_REG(LO, 0, 9, 12, 6), .access = access_pmceid }, 2626 { CP15_PMU_SYS_REG(LO, 0, 9, 12, 7), .access = access_pmceid }, 2627 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 13, 0), .access = access_pmu_evcntr }, 2628 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 13, 1), .access = access_pmu_evtyper }, 2629 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 13, 2), .access = access_pmu_evcntr }, 2630 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 0), .access = access_pmuserenr }, 2631 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 1), .access = access_pminten }, 2632 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 2), .access = access_pminten }, 2633 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 3), .access = access_pmovs }, 2634 { CP15_PMU_SYS_REG(HI, 0, 9, 14, 4), .access = access_pmceid }, 2635 { CP15_PMU_SYS_REG(HI, 0, 9, 14, 5), .access = access_pmceid }, 2636 /* PMMIR */ 2637 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 6), .access = trap_raz_wi }, 2638 2639 /* PRRR/MAIR0 */ 2640 { AA32(LO), Op1( 0), CRn(10), CRm( 2), Op2( 0), access_vm_reg, NULL, MAIR_EL1 }, 2641 /* NMRR/MAIR1 */ 2642 { AA32(HI), Op1( 0), CRn(10), CRm( 2), Op2( 1), access_vm_reg, NULL, MAIR_EL1 }, 2643 /* AMAIR0 */ 2644 { AA32(LO), Op1( 0), CRn(10), CRm( 3), Op2( 0), access_vm_reg, NULL, AMAIR_EL1 }, 2645 /* AMAIR1 */ 2646 { AA32(HI), Op1( 0), CRn(10), CRm( 3), Op2( 1), access_vm_reg, NULL, AMAIR_EL1 }, 2647 2648 /* ICC_SRE */ 2649 { Op1( 0), CRn(12), CRm(12), Op2( 5), access_gic_sre }, 2650 2651 { Op1( 0), CRn(13), CRm( 0), Op2( 1), access_vm_reg, NULL, CONTEXTIDR_EL1 }, 2652 2653 /* Arch Tmers */ 2654 { SYS_DESC(SYS_AARCH32_CNTP_TVAL), access_arch_timer }, 2655 { SYS_DESC(SYS_AARCH32_CNTP_CTL), access_arch_timer }, 2656 2657 /* PMEVCNTRn */ 2658 PMU_PMEVCNTR(0), 2659 PMU_PMEVCNTR(1), 2660 PMU_PMEVCNTR(2), 2661 PMU_PMEVCNTR(3), 2662 PMU_PMEVCNTR(4), 2663 PMU_PMEVCNTR(5), 2664 PMU_PMEVCNTR(6), 2665 PMU_PMEVCNTR(7), 2666 PMU_PMEVCNTR(8), 2667 PMU_PMEVCNTR(9), 2668 PMU_PMEVCNTR(10), 2669 PMU_PMEVCNTR(11), 2670 PMU_PMEVCNTR(12), 2671 PMU_PMEVCNTR(13), 2672 PMU_PMEVCNTR(14), 2673 PMU_PMEVCNTR(15), 2674 PMU_PMEVCNTR(16), 2675 PMU_PMEVCNTR(17), 2676 PMU_PMEVCNTR(18), 2677 PMU_PMEVCNTR(19), 2678 PMU_PMEVCNTR(20), 2679 PMU_PMEVCNTR(21), 2680 PMU_PMEVCNTR(22), 2681 PMU_PMEVCNTR(23), 2682 PMU_PMEVCNTR(24), 2683 PMU_PMEVCNTR(25), 2684 PMU_PMEVCNTR(26), 2685 PMU_PMEVCNTR(27), 2686 PMU_PMEVCNTR(28), 2687 PMU_PMEVCNTR(29), 2688 PMU_PMEVCNTR(30), 2689 /* PMEVTYPERn */ 2690 PMU_PMEVTYPER(0), 2691 PMU_PMEVTYPER(1), 2692 PMU_PMEVTYPER(2), 2693 PMU_PMEVTYPER(3), 2694 PMU_PMEVTYPER(4), 2695 PMU_PMEVTYPER(5), 2696 PMU_PMEVTYPER(6), 2697 PMU_PMEVTYPER(7), 2698 PMU_PMEVTYPER(8), 2699 PMU_PMEVTYPER(9), 2700 PMU_PMEVTYPER(10), 2701 PMU_PMEVTYPER(11), 2702 PMU_PMEVTYPER(12), 2703 PMU_PMEVTYPER(13), 2704 PMU_PMEVTYPER(14), 2705 PMU_PMEVTYPER(15), 2706 PMU_PMEVTYPER(16), 2707 PMU_PMEVTYPER(17), 2708 PMU_PMEVTYPER(18), 2709 PMU_PMEVTYPER(19), 2710 PMU_PMEVTYPER(20), 2711 PMU_PMEVTYPER(21), 2712 PMU_PMEVTYPER(22), 2713 PMU_PMEVTYPER(23), 2714 PMU_PMEVTYPER(24), 2715 PMU_PMEVTYPER(25), 2716 PMU_PMEVTYPER(26), 2717 PMU_PMEVTYPER(27), 2718 PMU_PMEVTYPER(28), 2719 PMU_PMEVTYPER(29), 2720 PMU_PMEVTYPER(30), 2721 /* PMCCFILTR */ 2722 { CP15_PMU_SYS_REG(DIRECT, 0, 14, 15, 7), .access = access_pmu_evtyper }, 2723 2724 { Op1(1), CRn( 0), CRm( 0), Op2(0), access_ccsidr }, 2725 { Op1(1), CRn( 0), CRm( 0), Op2(1), access_clidr }, 2726 2727 /* CCSIDR2 */ 2728 { Op1(1), CRn( 0), CRm( 0), Op2(2), undef_access }, 2729 2730 { Op1(2), CRn( 0), CRm( 0), Op2(0), access_csselr, NULL, CSSELR_EL1 }, 2731 }; 2732 2733 static const struct sys_reg_desc cp15_64_regs[] = { 2734 { Op1( 0), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, TTBR0_EL1 }, 2735 { CP15_PMU_SYS_REG(DIRECT, 0, 0, 9, 0), .access = access_pmu_evcntr }, 2736 { Op1( 0), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_SGI1R */ 2737 { SYS_DESC(SYS_AARCH32_CNTPCT), access_arch_timer }, 2738 { Op1( 1), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, TTBR1_EL1 }, 2739 { Op1( 1), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_ASGI1R */ 2740 { Op1( 2), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_SGI0R */ 2741 { SYS_DESC(SYS_AARCH32_CNTP_CVAL), access_arch_timer }, 2742 { SYS_DESC(SYS_AARCH32_CNTPCTSS), access_arch_timer }, 2743 }; 2744 2745 static bool check_sysreg_table(const struct sys_reg_desc *table, unsigned int n, 2746 bool is_32) 2747 { 2748 unsigned int i; 2749 2750 for (i = 0; i < n; i++) { 2751 if (!is_32 && table[i].reg && !table[i].reset) { 2752 kvm_err("sys_reg table %pS entry %d lacks reset\n", &table[i], i); 2753 return false; 2754 } 2755 2756 if (i && cmp_sys_reg(&table[i-1], &table[i]) >= 0) { 2757 kvm_err("sys_reg table %pS entry %d out of order\n", &table[i - 1], i - 1); 2758 return false; 2759 } 2760 } 2761 2762 return true; 2763 } 2764 2765 int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu) 2766 { 2767 kvm_inject_undefined(vcpu); 2768 return 1; 2769 } 2770 2771 static void perform_access(struct kvm_vcpu *vcpu, 2772 struct sys_reg_params *params, 2773 const struct sys_reg_desc *r) 2774 { 2775 trace_kvm_sys_access(*vcpu_pc(vcpu), params, r); 2776 2777 /* Check for regs disabled by runtime config */ 2778 if (sysreg_hidden(vcpu, r)) { 2779 kvm_inject_undefined(vcpu); 2780 return; 2781 } 2782 2783 /* 2784 * Not having an accessor means that we have configured a trap 2785 * that we don't know how to handle. This certainly qualifies 2786 * as a gross bug that should be fixed right away. 2787 */ 2788 BUG_ON(!r->access); 2789 2790 /* Skip instruction if instructed so */ 2791 if (likely(r->access(vcpu, params, r))) 2792 kvm_incr_pc(vcpu); 2793 } 2794 2795 /* 2796 * emulate_cp -- tries to match a sys_reg access in a handling table, and 2797 * call the corresponding trap handler. 2798 * 2799 * @params: pointer to the descriptor of the access 2800 * @table: array of trap descriptors 2801 * @num: size of the trap descriptor array 2802 * 2803 * Return true if the access has been handled, false if not. 2804 */ 2805 static bool emulate_cp(struct kvm_vcpu *vcpu, 2806 struct sys_reg_params *params, 2807 const struct sys_reg_desc *table, 2808 size_t num) 2809 { 2810 const struct sys_reg_desc *r; 2811 2812 if (!table) 2813 return false; /* Not handled */ 2814 2815 r = find_reg(params, table, num); 2816 2817 if (r) { 2818 perform_access(vcpu, params, r); 2819 return true; 2820 } 2821 2822 /* Not handled */ 2823 return false; 2824 } 2825 2826 static void unhandled_cp_access(struct kvm_vcpu *vcpu, 2827 struct sys_reg_params *params) 2828 { 2829 u8 esr_ec = kvm_vcpu_trap_get_class(vcpu); 2830 int cp = -1; 2831 2832 switch (esr_ec) { 2833 case ESR_ELx_EC_CP15_32: 2834 case ESR_ELx_EC_CP15_64: 2835 cp = 15; 2836 break; 2837 case ESR_ELx_EC_CP14_MR: 2838 case ESR_ELx_EC_CP14_64: 2839 cp = 14; 2840 break; 2841 default: 2842 WARN_ON(1); 2843 } 2844 2845 print_sys_reg_msg(params, 2846 "Unsupported guest CP%d access at: %08lx [%08lx]\n", 2847 cp, *vcpu_pc(vcpu), *vcpu_cpsr(vcpu)); 2848 kvm_inject_undefined(vcpu); 2849 } 2850 2851 /** 2852 * kvm_handle_cp_64 -- handles a mrrc/mcrr trap on a guest CP14/CP15 access 2853 * @vcpu: The VCPU pointer 2854 * @run: The kvm_run struct 2855 */ 2856 static int kvm_handle_cp_64(struct kvm_vcpu *vcpu, 2857 const struct sys_reg_desc *global, 2858 size_t nr_global) 2859 { 2860 struct sys_reg_params params; 2861 u64 esr = kvm_vcpu_get_esr(vcpu); 2862 int Rt = kvm_vcpu_sys_get_rt(vcpu); 2863 int Rt2 = (esr >> 10) & 0x1f; 2864 2865 params.CRm = (esr >> 1) & 0xf; 2866 params.is_write = ((esr & 1) == 0); 2867 2868 params.Op0 = 0; 2869 params.Op1 = (esr >> 16) & 0xf; 2870 params.Op2 = 0; 2871 params.CRn = 0; 2872 2873 /* 2874 * Make a 64-bit value out of Rt and Rt2. As we use the same trap 2875 * backends between AArch32 and AArch64, we get away with it. 2876 */ 2877 if (params.is_write) { 2878 params.regval = vcpu_get_reg(vcpu, Rt) & 0xffffffff; 2879 params.regval |= vcpu_get_reg(vcpu, Rt2) << 32; 2880 } 2881 2882 /* 2883 * If the table contains a handler, handle the 2884 * potential register operation in the case of a read and return 2885 * with success. 2886 */ 2887 if (emulate_cp(vcpu, ¶ms, global, nr_global)) { 2888 /* Split up the value between registers for the read side */ 2889 if (!params.is_write) { 2890 vcpu_set_reg(vcpu, Rt, lower_32_bits(params.regval)); 2891 vcpu_set_reg(vcpu, Rt2, upper_32_bits(params.regval)); 2892 } 2893 2894 return 1; 2895 } 2896 2897 unhandled_cp_access(vcpu, ¶ms); 2898 return 1; 2899 } 2900 2901 static bool emulate_sys_reg(struct kvm_vcpu *vcpu, struct sys_reg_params *params); 2902 2903 /* 2904 * The CP10 ID registers are architecturally mapped to AArch64 feature 2905 * registers. Abuse that fact so we can rely on the AArch64 handler for accesses 2906 * from AArch32. 2907 */ 2908 static bool kvm_esr_cp10_id_to_sys64(u64 esr, struct sys_reg_params *params) 2909 { 2910 u8 reg_id = (esr >> 10) & 0xf; 2911 bool valid; 2912 2913 params->is_write = ((esr & 1) == 0); 2914 params->Op0 = 3; 2915 params->Op1 = 0; 2916 params->CRn = 0; 2917 params->CRm = 3; 2918 2919 /* CP10 ID registers are read-only */ 2920 valid = !params->is_write; 2921 2922 switch (reg_id) { 2923 /* MVFR0 */ 2924 case 0b0111: 2925 params->Op2 = 0; 2926 break; 2927 /* MVFR1 */ 2928 case 0b0110: 2929 params->Op2 = 1; 2930 break; 2931 /* MVFR2 */ 2932 case 0b0101: 2933 params->Op2 = 2; 2934 break; 2935 default: 2936 valid = false; 2937 } 2938 2939 if (valid) 2940 return true; 2941 2942 kvm_pr_unimpl("Unhandled cp10 register %s: %u\n", 2943 params->is_write ? "write" : "read", reg_id); 2944 return false; 2945 } 2946 2947 /** 2948 * kvm_handle_cp10_id() - Handles a VMRS trap on guest access to a 'Media and 2949 * VFP Register' from AArch32. 2950 * @vcpu: The vCPU pointer 2951 * 2952 * MVFR{0-2} are architecturally mapped to the AArch64 MVFR{0-2}_EL1 registers. 2953 * Work out the correct AArch64 system register encoding and reroute to the 2954 * AArch64 system register emulation. 2955 */ 2956 int kvm_handle_cp10_id(struct kvm_vcpu *vcpu) 2957 { 2958 int Rt = kvm_vcpu_sys_get_rt(vcpu); 2959 u64 esr = kvm_vcpu_get_esr(vcpu); 2960 struct sys_reg_params params; 2961 2962 /* UNDEF on any unhandled register access */ 2963 if (!kvm_esr_cp10_id_to_sys64(esr, ¶ms)) { 2964 kvm_inject_undefined(vcpu); 2965 return 1; 2966 } 2967 2968 if (emulate_sys_reg(vcpu, ¶ms)) 2969 vcpu_set_reg(vcpu, Rt, params.regval); 2970 2971 return 1; 2972 } 2973 2974 /** 2975 * kvm_emulate_cp15_id_reg() - Handles an MRC trap on a guest CP15 access where 2976 * CRn=0, which corresponds to the AArch32 feature 2977 * registers. 2978 * @vcpu: the vCPU pointer 2979 * @params: the system register access parameters. 2980 * 2981 * Our cp15 system register tables do not enumerate the AArch32 feature 2982 * registers. Conveniently, our AArch64 table does, and the AArch32 system 2983 * register encoding can be trivially remapped into the AArch64 for the feature 2984 * registers: Append op0=3, leaving op1, CRn, CRm, and op2 the same. 2985 * 2986 * According to DDI0487G.b G7.3.1, paragraph "Behavior of VMSAv8-32 32-bit 2987 * System registers with (coproc=0b1111, CRn==c0)", read accesses from this 2988 * range are either UNKNOWN or RES0. Rerouting remains architectural as we 2989 * treat undefined registers in this range as RAZ. 2990 */ 2991 static int kvm_emulate_cp15_id_reg(struct kvm_vcpu *vcpu, 2992 struct sys_reg_params *params) 2993 { 2994 int Rt = kvm_vcpu_sys_get_rt(vcpu); 2995 2996 /* Treat impossible writes to RO registers as UNDEFINED */ 2997 if (params->is_write) { 2998 unhandled_cp_access(vcpu, params); 2999 return 1; 3000 } 3001 3002 params->Op0 = 3; 3003 3004 /* 3005 * All registers where CRm > 3 are known to be UNKNOWN/RAZ from AArch32. 3006 * Avoid conflicting with future expansion of AArch64 feature registers 3007 * and simply treat them as RAZ here. 3008 */ 3009 if (params->CRm > 3) 3010 params->regval = 0; 3011 else if (!emulate_sys_reg(vcpu, params)) 3012 return 1; 3013 3014 vcpu_set_reg(vcpu, Rt, params->regval); 3015 return 1; 3016 } 3017 3018 /** 3019 * kvm_handle_cp_32 -- handles a mrc/mcr trap on a guest CP14/CP15 access 3020 * @vcpu: The VCPU pointer 3021 * @run: The kvm_run struct 3022 */ 3023 static int kvm_handle_cp_32(struct kvm_vcpu *vcpu, 3024 struct sys_reg_params *params, 3025 const struct sys_reg_desc *global, 3026 size_t nr_global) 3027 { 3028 int Rt = kvm_vcpu_sys_get_rt(vcpu); 3029 3030 params->regval = vcpu_get_reg(vcpu, Rt); 3031 3032 if (emulate_cp(vcpu, params, global, nr_global)) { 3033 if (!params->is_write) 3034 vcpu_set_reg(vcpu, Rt, params->regval); 3035 return 1; 3036 } 3037 3038 unhandled_cp_access(vcpu, params); 3039 return 1; 3040 } 3041 3042 int kvm_handle_cp15_64(struct kvm_vcpu *vcpu) 3043 { 3044 return kvm_handle_cp_64(vcpu, cp15_64_regs, ARRAY_SIZE(cp15_64_regs)); 3045 } 3046 3047 int kvm_handle_cp15_32(struct kvm_vcpu *vcpu) 3048 { 3049 struct sys_reg_params params; 3050 3051 params = esr_cp1x_32_to_params(kvm_vcpu_get_esr(vcpu)); 3052 3053 /* 3054 * Certain AArch32 ID registers are handled by rerouting to the AArch64 3055 * system register table. Registers in the ID range where CRm=0 are 3056 * excluded from this scheme as they do not trivially map into AArch64 3057 * system register encodings. 3058 */ 3059 if (params.Op1 == 0 && params.CRn == 0 && params.CRm) 3060 return kvm_emulate_cp15_id_reg(vcpu, ¶ms); 3061 3062 return kvm_handle_cp_32(vcpu, ¶ms, cp15_regs, ARRAY_SIZE(cp15_regs)); 3063 } 3064 3065 int kvm_handle_cp14_64(struct kvm_vcpu *vcpu) 3066 { 3067 return kvm_handle_cp_64(vcpu, cp14_64_regs, ARRAY_SIZE(cp14_64_regs)); 3068 } 3069 3070 int kvm_handle_cp14_32(struct kvm_vcpu *vcpu) 3071 { 3072 struct sys_reg_params params; 3073 3074 params = esr_cp1x_32_to_params(kvm_vcpu_get_esr(vcpu)); 3075 3076 return kvm_handle_cp_32(vcpu, ¶ms, cp14_regs, ARRAY_SIZE(cp14_regs)); 3077 } 3078 3079 static bool is_imp_def_sys_reg(struct sys_reg_params *params) 3080 { 3081 // See ARM DDI 0487E.a, section D12.3.2 3082 return params->Op0 == 3 && (params->CRn & 0b1011) == 0b1011; 3083 } 3084 3085 /** 3086 * emulate_sys_reg - Emulate a guest access to an AArch64 system register 3087 * @vcpu: The VCPU pointer 3088 * @params: Decoded system register parameters 3089 * 3090 * Return: true if the system register access was successful, false otherwise. 3091 */ 3092 static bool emulate_sys_reg(struct kvm_vcpu *vcpu, 3093 struct sys_reg_params *params) 3094 { 3095 const struct sys_reg_desc *r; 3096 3097 r = find_reg(params, sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); 3098 3099 if (likely(r)) { 3100 perform_access(vcpu, params, r); 3101 return true; 3102 } 3103 3104 if (is_imp_def_sys_reg(params)) { 3105 kvm_inject_undefined(vcpu); 3106 } else { 3107 print_sys_reg_msg(params, 3108 "Unsupported guest sys_reg access at: %lx [%08lx]\n", 3109 *vcpu_pc(vcpu), *vcpu_cpsr(vcpu)); 3110 kvm_inject_undefined(vcpu); 3111 } 3112 return false; 3113 } 3114 3115 static void kvm_reset_id_regs(struct kvm_vcpu *vcpu) 3116 { 3117 const struct sys_reg_desc *idreg = first_idreg; 3118 u32 id = reg_to_encoding(idreg); 3119 struct kvm *kvm = vcpu->kvm; 3120 3121 if (test_bit(KVM_ARCH_FLAG_ID_REGS_INITIALIZED, &kvm->arch.flags)) 3122 return; 3123 3124 lockdep_assert_held(&kvm->arch.config_lock); 3125 3126 /* Initialize all idregs */ 3127 while (is_id_reg(id)) { 3128 IDREG(kvm, id) = idreg->reset(vcpu, idreg); 3129 3130 idreg++; 3131 id = reg_to_encoding(idreg); 3132 } 3133 3134 set_bit(KVM_ARCH_FLAG_ID_REGS_INITIALIZED, &kvm->arch.flags); 3135 } 3136 3137 /** 3138 * kvm_reset_sys_regs - sets system registers to reset value 3139 * @vcpu: The VCPU pointer 3140 * 3141 * This function finds the right table above and sets the registers on the 3142 * virtual CPU struct to their architecturally defined reset values. 3143 */ 3144 void kvm_reset_sys_regs(struct kvm_vcpu *vcpu) 3145 { 3146 unsigned long i; 3147 3148 kvm_reset_id_regs(vcpu); 3149 3150 for (i = 0; i < ARRAY_SIZE(sys_reg_descs); i++) { 3151 const struct sys_reg_desc *r = &sys_reg_descs[i]; 3152 3153 if (is_id_reg(reg_to_encoding(r))) 3154 continue; 3155 3156 if (r->reset) 3157 r->reset(vcpu, r); 3158 } 3159 } 3160 3161 /** 3162 * kvm_handle_sys_reg -- handles a mrs/msr trap on a guest sys_reg access 3163 * @vcpu: The VCPU pointer 3164 */ 3165 int kvm_handle_sys_reg(struct kvm_vcpu *vcpu) 3166 { 3167 struct sys_reg_params params; 3168 unsigned long esr = kvm_vcpu_get_esr(vcpu); 3169 int Rt = kvm_vcpu_sys_get_rt(vcpu); 3170 3171 trace_kvm_handle_sys_reg(esr); 3172 3173 params = esr_sys64_to_params(esr); 3174 params.regval = vcpu_get_reg(vcpu, Rt); 3175 3176 if (!emulate_sys_reg(vcpu, ¶ms)) 3177 return 1; 3178 3179 if (!params.is_write) 3180 vcpu_set_reg(vcpu, Rt, params.regval); 3181 return 1; 3182 } 3183 3184 /****************************************************************************** 3185 * Userspace API 3186 *****************************************************************************/ 3187 3188 static bool index_to_params(u64 id, struct sys_reg_params *params) 3189 { 3190 switch (id & KVM_REG_SIZE_MASK) { 3191 case KVM_REG_SIZE_U64: 3192 /* Any unused index bits means it's not valid. */ 3193 if (id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK 3194 | KVM_REG_ARM_COPROC_MASK 3195 | KVM_REG_ARM64_SYSREG_OP0_MASK 3196 | KVM_REG_ARM64_SYSREG_OP1_MASK 3197 | KVM_REG_ARM64_SYSREG_CRN_MASK 3198 | KVM_REG_ARM64_SYSREG_CRM_MASK 3199 | KVM_REG_ARM64_SYSREG_OP2_MASK)) 3200 return false; 3201 params->Op0 = ((id & KVM_REG_ARM64_SYSREG_OP0_MASK) 3202 >> KVM_REG_ARM64_SYSREG_OP0_SHIFT); 3203 params->Op1 = ((id & KVM_REG_ARM64_SYSREG_OP1_MASK) 3204 >> KVM_REG_ARM64_SYSREG_OP1_SHIFT); 3205 params->CRn = ((id & KVM_REG_ARM64_SYSREG_CRN_MASK) 3206 >> KVM_REG_ARM64_SYSREG_CRN_SHIFT); 3207 params->CRm = ((id & KVM_REG_ARM64_SYSREG_CRM_MASK) 3208 >> KVM_REG_ARM64_SYSREG_CRM_SHIFT); 3209 params->Op2 = ((id & KVM_REG_ARM64_SYSREG_OP2_MASK) 3210 >> KVM_REG_ARM64_SYSREG_OP2_SHIFT); 3211 return true; 3212 default: 3213 return false; 3214 } 3215 } 3216 3217 const struct sys_reg_desc *get_reg_by_id(u64 id, 3218 const struct sys_reg_desc table[], 3219 unsigned int num) 3220 { 3221 struct sys_reg_params params; 3222 3223 if (!index_to_params(id, ¶ms)) 3224 return NULL; 3225 3226 return find_reg(¶ms, table, num); 3227 } 3228 3229 /* Decode an index value, and find the sys_reg_desc entry. */ 3230 static const struct sys_reg_desc * 3231 id_to_sys_reg_desc(struct kvm_vcpu *vcpu, u64 id, 3232 const struct sys_reg_desc table[], unsigned int num) 3233 3234 { 3235 const struct sys_reg_desc *r; 3236 3237 /* We only do sys_reg for now. */ 3238 if ((id & KVM_REG_ARM_COPROC_MASK) != KVM_REG_ARM64_SYSREG) 3239 return NULL; 3240 3241 r = get_reg_by_id(id, table, num); 3242 3243 /* Not saved in the sys_reg array and not otherwise accessible? */ 3244 if (r && (!(r->reg || r->get_user) || sysreg_hidden(vcpu, r))) 3245 r = NULL; 3246 3247 return r; 3248 } 3249 3250 /* 3251 * These are the invariant sys_reg registers: we let the guest see the 3252 * host versions of these, so they're part of the guest state. 3253 * 3254 * A future CPU may provide a mechanism to present different values to 3255 * the guest, or a future kvm may trap them. 3256 */ 3257 3258 #define FUNCTION_INVARIANT(reg) \ 3259 static u64 get_##reg(struct kvm_vcpu *v, \ 3260 const struct sys_reg_desc *r) \ 3261 { \ 3262 ((struct sys_reg_desc *)r)->val = read_sysreg(reg); \ 3263 return ((struct sys_reg_desc *)r)->val; \ 3264 } 3265 3266 FUNCTION_INVARIANT(midr_el1) 3267 FUNCTION_INVARIANT(revidr_el1) 3268 FUNCTION_INVARIANT(aidr_el1) 3269 3270 static u64 get_ctr_el0(struct kvm_vcpu *v, const struct sys_reg_desc *r) 3271 { 3272 ((struct sys_reg_desc *)r)->val = read_sanitised_ftr_reg(SYS_CTR_EL0); 3273 return ((struct sys_reg_desc *)r)->val; 3274 } 3275 3276 /* ->val is filled in by kvm_sys_reg_table_init() */ 3277 static struct sys_reg_desc invariant_sys_regs[] __ro_after_init = { 3278 { SYS_DESC(SYS_MIDR_EL1), NULL, get_midr_el1 }, 3279 { SYS_DESC(SYS_REVIDR_EL1), NULL, get_revidr_el1 }, 3280 { SYS_DESC(SYS_AIDR_EL1), NULL, get_aidr_el1 }, 3281 { SYS_DESC(SYS_CTR_EL0), NULL, get_ctr_el0 }, 3282 }; 3283 3284 static int get_invariant_sys_reg(u64 id, u64 __user *uaddr) 3285 { 3286 const struct sys_reg_desc *r; 3287 3288 r = get_reg_by_id(id, invariant_sys_regs, 3289 ARRAY_SIZE(invariant_sys_regs)); 3290 if (!r) 3291 return -ENOENT; 3292 3293 return put_user(r->val, uaddr); 3294 } 3295 3296 static int set_invariant_sys_reg(u64 id, u64 __user *uaddr) 3297 { 3298 const struct sys_reg_desc *r; 3299 u64 val; 3300 3301 r = get_reg_by_id(id, invariant_sys_regs, 3302 ARRAY_SIZE(invariant_sys_regs)); 3303 if (!r) 3304 return -ENOENT; 3305 3306 if (get_user(val, uaddr)) 3307 return -EFAULT; 3308 3309 /* This is what we mean by invariant: you can't change it. */ 3310 if (r->val != val) 3311 return -EINVAL; 3312 3313 return 0; 3314 } 3315 3316 static int demux_c15_get(struct kvm_vcpu *vcpu, u64 id, void __user *uaddr) 3317 { 3318 u32 val; 3319 u32 __user *uval = uaddr; 3320 3321 /* Fail if we have unknown bits set. */ 3322 if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK 3323 | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1))) 3324 return -ENOENT; 3325 3326 switch (id & KVM_REG_ARM_DEMUX_ID_MASK) { 3327 case KVM_REG_ARM_DEMUX_ID_CCSIDR: 3328 if (KVM_REG_SIZE(id) != 4) 3329 return -ENOENT; 3330 val = (id & KVM_REG_ARM_DEMUX_VAL_MASK) 3331 >> KVM_REG_ARM_DEMUX_VAL_SHIFT; 3332 if (val >= CSSELR_MAX) 3333 return -ENOENT; 3334 3335 return put_user(get_ccsidr(vcpu, val), uval); 3336 default: 3337 return -ENOENT; 3338 } 3339 } 3340 3341 static int demux_c15_set(struct kvm_vcpu *vcpu, u64 id, void __user *uaddr) 3342 { 3343 u32 val, newval; 3344 u32 __user *uval = uaddr; 3345 3346 /* Fail if we have unknown bits set. */ 3347 if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK 3348 | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1))) 3349 return -ENOENT; 3350 3351 switch (id & KVM_REG_ARM_DEMUX_ID_MASK) { 3352 case KVM_REG_ARM_DEMUX_ID_CCSIDR: 3353 if (KVM_REG_SIZE(id) != 4) 3354 return -ENOENT; 3355 val = (id & KVM_REG_ARM_DEMUX_VAL_MASK) 3356 >> KVM_REG_ARM_DEMUX_VAL_SHIFT; 3357 if (val >= CSSELR_MAX) 3358 return -ENOENT; 3359 3360 if (get_user(newval, uval)) 3361 return -EFAULT; 3362 3363 return set_ccsidr(vcpu, val, newval); 3364 default: 3365 return -ENOENT; 3366 } 3367 } 3368 3369 int kvm_sys_reg_get_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg, 3370 const struct sys_reg_desc table[], unsigned int num) 3371 { 3372 u64 __user *uaddr = (u64 __user *)(unsigned long)reg->addr; 3373 const struct sys_reg_desc *r; 3374 u64 val; 3375 int ret; 3376 3377 r = id_to_sys_reg_desc(vcpu, reg->id, table, num); 3378 if (!r || sysreg_hidden_user(vcpu, r)) 3379 return -ENOENT; 3380 3381 if (r->get_user) { 3382 ret = (r->get_user)(vcpu, r, &val); 3383 } else { 3384 val = __vcpu_sys_reg(vcpu, r->reg); 3385 ret = 0; 3386 } 3387 3388 if (!ret) 3389 ret = put_user(val, uaddr); 3390 3391 return ret; 3392 } 3393 3394 int kvm_arm_sys_reg_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) 3395 { 3396 void __user *uaddr = (void __user *)(unsigned long)reg->addr; 3397 int err; 3398 3399 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX) 3400 return demux_c15_get(vcpu, reg->id, uaddr); 3401 3402 err = get_invariant_sys_reg(reg->id, uaddr); 3403 if (err != -ENOENT) 3404 return err; 3405 3406 return kvm_sys_reg_get_user(vcpu, reg, 3407 sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); 3408 } 3409 3410 int kvm_sys_reg_set_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg, 3411 const struct sys_reg_desc table[], unsigned int num) 3412 { 3413 u64 __user *uaddr = (u64 __user *)(unsigned long)reg->addr; 3414 const struct sys_reg_desc *r; 3415 u64 val; 3416 int ret; 3417 3418 if (get_user(val, uaddr)) 3419 return -EFAULT; 3420 3421 r = id_to_sys_reg_desc(vcpu, reg->id, table, num); 3422 if (!r || sysreg_hidden_user(vcpu, r)) 3423 return -ENOENT; 3424 3425 if (sysreg_user_write_ignore(vcpu, r)) 3426 return 0; 3427 3428 if (r->set_user) { 3429 ret = (r->set_user)(vcpu, r, val); 3430 } else { 3431 __vcpu_sys_reg(vcpu, r->reg) = val; 3432 ret = 0; 3433 } 3434 3435 return ret; 3436 } 3437 3438 int kvm_arm_sys_reg_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) 3439 { 3440 void __user *uaddr = (void __user *)(unsigned long)reg->addr; 3441 int err; 3442 3443 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX) 3444 return demux_c15_set(vcpu, reg->id, uaddr); 3445 3446 err = set_invariant_sys_reg(reg->id, uaddr); 3447 if (err != -ENOENT) 3448 return err; 3449 3450 return kvm_sys_reg_set_user(vcpu, reg, 3451 sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); 3452 } 3453 3454 static unsigned int num_demux_regs(void) 3455 { 3456 return CSSELR_MAX; 3457 } 3458 3459 static int write_demux_regids(u64 __user *uindices) 3460 { 3461 u64 val = KVM_REG_ARM64 | KVM_REG_SIZE_U32 | KVM_REG_ARM_DEMUX; 3462 unsigned int i; 3463 3464 val |= KVM_REG_ARM_DEMUX_ID_CCSIDR; 3465 for (i = 0; i < CSSELR_MAX; i++) { 3466 if (put_user(val | i, uindices)) 3467 return -EFAULT; 3468 uindices++; 3469 } 3470 return 0; 3471 } 3472 3473 static u64 sys_reg_to_index(const struct sys_reg_desc *reg) 3474 { 3475 return (KVM_REG_ARM64 | KVM_REG_SIZE_U64 | 3476 KVM_REG_ARM64_SYSREG | 3477 (reg->Op0 << KVM_REG_ARM64_SYSREG_OP0_SHIFT) | 3478 (reg->Op1 << KVM_REG_ARM64_SYSREG_OP1_SHIFT) | 3479 (reg->CRn << KVM_REG_ARM64_SYSREG_CRN_SHIFT) | 3480 (reg->CRm << KVM_REG_ARM64_SYSREG_CRM_SHIFT) | 3481 (reg->Op2 << KVM_REG_ARM64_SYSREG_OP2_SHIFT)); 3482 } 3483 3484 static bool copy_reg_to_user(const struct sys_reg_desc *reg, u64 __user **uind) 3485 { 3486 if (!*uind) 3487 return true; 3488 3489 if (put_user(sys_reg_to_index(reg), *uind)) 3490 return false; 3491 3492 (*uind)++; 3493 return true; 3494 } 3495 3496 static int walk_one_sys_reg(const struct kvm_vcpu *vcpu, 3497 const struct sys_reg_desc *rd, 3498 u64 __user **uind, 3499 unsigned int *total) 3500 { 3501 /* 3502 * Ignore registers we trap but don't save, 3503 * and for which no custom user accessor is provided. 3504 */ 3505 if (!(rd->reg || rd->get_user)) 3506 return 0; 3507 3508 if (sysreg_hidden_user(vcpu, rd)) 3509 return 0; 3510 3511 if (!copy_reg_to_user(rd, uind)) 3512 return -EFAULT; 3513 3514 (*total)++; 3515 return 0; 3516 } 3517 3518 /* Assumed ordered tables, see kvm_sys_reg_table_init. */ 3519 static int walk_sys_regs(struct kvm_vcpu *vcpu, u64 __user *uind) 3520 { 3521 const struct sys_reg_desc *i2, *end2; 3522 unsigned int total = 0; 3523 int err; 3524 3525 i2 = sys_reg_descs; 3526 end2 = sys_reg_descs + ARRAY_SIZE(sys_reg_descs); 3527 3528 while (i2 != end2) { 3529 err = walk_one_sys_reg(vcpu, i2++, &uind, &total); 3530 if (err) 3531 return err; 3532 } 3533 return total; 3534 } 3535 3536 unsigned long kvm_arm_num_sys_reg_descs(struct kvm_vcpu *vcpu) 3537 { 3538 return ARRAY_SIZE(invariant_sys_regs) 3539 + num_demux_regs() 3540 + walk_sys_regs(vcpu, (u64 __user *)NULL); 3541 } 3542 3543 int kvm_arm_copy_sys_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices) 3544 { 3545 unsigned int i; 3546 int err; 3547 3548 /* Then give them all the invariant registers' indices. */ 3549 for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++) { 3550 if (put_user(sys_reg_to_index(&invariant_sys_regs[i]), uindices)) 3551 return -EFAULT; 3552 uindices++; 3553 } 3554 3555 err = walk_sys_regs(vcpu, uindices); 3556 if (err < 0) 3557 return err; 3558 uindices += err; 3559 3560 return write_demux_regids(uindices); 3561 } 3562 3563 int __init kvm_sys_reg_table_init(void) 3564 { 3565 struct sys_reg_params params; 3566 bool valid = true; 3567 unsigned int i; 3568 3569 /* Make sure tables are unique and in order. */ 3570 valid &= check_sysreg_table(sys_reg_descs, ARRAY_SIZE(sys_reg_descs), false); 3571 valid &= check_sysreg_table(cp14_regs, ARRAY_SIZE(cp14_regs), true); 3572 valid &= check_sysreg_table(cp14_64_regs, ARRAY_SIZE(cp14_64_regs), true); 3573 valid &= check_sysreg_table(cp15_regs, ARRAY_SIZE(cp15_regs), true); 3574 valid &= check_sysreg_table(cp15_64_regs, ARRAY_SIZE(cp15_64_regs), true); 3575 valid &= check_sysreg_table(invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs), false); 3576 3577 if (!valid) 3578 return -EINVAL; 3579 3580 /* We abuse the reset function to overwrite the table itself. */ 3581 for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++) 3582 invariant_sys_regs[i].reset(NULL, &invariant_sys_regs[i]); 3583 3584 /* Find the first idreg (SYS_ID_PFR0_EL1) in sys_reg_descs. */ 3585 params = encoding_to_params(SYS_ID_PFR0_EL1); 3586 first_idreg = find_reg(¶ms, sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); 3587 if (!first_idreg) 3588 return -EINVAL; 3589 3590 return 0; 3591 } 3592