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/debugfs.h> 16 #include <linux/kvm_host.h> 17 #include <linux/mm.h> 18 #include <linux/printk.h> 19 #include <linux/uaccess.h> 20 21 #include <asm/cacheflush.h> 22 #include <asm/cputype.h> 23 #include <asm/debug-monitors.h> 24 #include <asm/esr.h> 25 #include <asm/kvm_arm.h> 26 #include <asm/kvm_emulate.h> 27 #include <asm/kvm_hyp.h> 28 #include <asm/kvm_mmu.h> 29 #include <asm/kvm_nested.h> 30 #include <asm/perf_event.h> 31 #include <asm/sysreg.h> 32 33 #include <trace/events/kvm.h> 34 35 #include "sys_regs.h" 36 #include "vgic/vgic.h" 37 38 #include "trace.h" 39 40 /* 41 * For AArch32, we only take care of what is being trapped. Anything 42 * that has to do with init and userspace access has to go via the 43 * 64bit interface. 44 */ 45 46 static u64 sys_reg_to_index(const struct sys_reg_desc *reg); 47 static int set_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 48 u64 val); 49 50 static bool bad_trap(struct kvm_vcpu *vcpu, 51 struct sys_reg_params *params, 52 const struct sys_reg_desc *r, 53 const char *msg) 54 { 55 WARN_ONCE(1, "Unexpected %s\n", msg); 56 print_sys_reg_instr(params); 57 kvm_inject_undefined(vcpu); 58 return false; 59 } 60 61 static bool read_from_write_only(struct kvm_vcpu *vcpu, 62 struct sys_reg_params *params, 63 const struct sys_reg_desc *r) 64 { 65 return bad_trap(vcpu, params, r, 66 "sys_reg read to write-only register"); 67 } 68 69 static bool write_to_read_only(struct kvm_vcpu *vcpu, 70 struct sys_reg_params *params, 71 const struct sys_reg_desc *r) 72 { 73 return bad_trap(vcpu, params, r, 74 "sys_reg write to read-only register"); 75 } 76 77 #define PURE_EL2_SYSREG(el2) \ 78 case el2: { \ 79 *el1r = el2; \ 80 return true; \ 81 } 82 83 #define MAPPED_EL2_SYSREG(el2, el1, fn) \ 84 case el2: { \ 85 *xlate = fn; \ 86 *el1r = el1; \ 87 return true; \ 88 } 89 90 static bool get_el2_to_el1_mapping(unsigned int reg, 91 unsigned int *el1r, u64 (**xlate)(u64)) 92 { 93 switch (reg) { 94 PURE_EL2_SYSREG( VPIDR_EL2 ); 95 PURE_EL2_SYSREG( VMPIDR_EL2 ); 96 PURE_EL2_SYSREG( ACTLR_EL2 ); 97 PURE_EL2_SYSREG( HCR_EL2 ); 98 PURE_EL2_SYSREG( MDCR_EL2 ); 99 PURE_EL2_SYSREG( HSTR_EL2 ); 100 PURE_EL2_SYSREG( HACR_EL2 ); 101 PURE_EL2_SYSREG( VTTBR_EL2 ); 102 PURE_EL2_SYSREG( VTCR_EL2 ); 103 PURE_EL2_SYSREG( RVBAR_EL2 ); 104 PURE_EL2_SYSREG( TPIDR_EL2 ); 105 PURE_EL2_SYSREG( HPFAR_EL2 ); 106 PURE_EL2_SYSREG( CNTHCTL_EL2 ); 107 MAPPED_EL2_SYSREG(SCTLR_EL2, SCTLR_EL1, 108 translate_sctlr_el2_to_sctlr_el1 ); 109 MAPPED_EL2_SYSREG(CPTR_EL2, CPACR_EL1, 110 translate_cptr_el2_to_cpacr_el1 ); 111 MAPPED_EL2_SYSREG(TTBR0_EL2, TTBR0_EL1, 112 translate_ttbr0_el2_to_ttbr0_el1 ); 113 MAPPED_EL2_SYSREG(TTBR1_EL2, TTBR1_EL1, NULL ); 114 MAPPED_EL2_SYSREG(TCR_EL2, TCR_EL1, 115 translate_tcr_el2_to_tcr_el1 ); 116 MAPPED_EL2_SYSREG(VBAR_EL2, VBAR_EL1, NULL ); 117 MAPPED_EL2_SYSREG(AFSR0_EL2, AFSR0_EL1, NULL ); 118 MAPPED_EL2_SYSREG(AFSR1_EL2, AFSR1_EL1, NULL ); 119 MAPPED_EL2_SYSREG(ESR_EL2, ESR_EL1, NULL ); 120 MAPPED_EL2_SYSREG(FAR_EL2, FAR_EL1, NULL ); 121 MAPPED_EL2_SYSREG(MAIR_EL2, MAIR_EL1, NULL ); 122 MAPPED_EL2_SYSREG(AMAIR_EL2, AMAIR_EL1, NULL ); 123 MAPPED_EL2_SYSREG(ELR_EL2, ELR_EL1, NULL ); 124 MAPPED_EL2_SYSREG(SPSR_EL2, SPSR_EL1, NULL ); 125 MAPPED_EL2_SYSREG(ZCR_EL2, ZCR_EL1, NULL ); 126 default: 127 return false; 128 } 129 } 130 131 u64 vcpu_read_sys_reg(const struct kvm_vcpu *vcpu, int reg) 132 { 133 u64 val = 0x8badf00d8badf00d; 134 u64 (*xlate)(u64) = NULL; 135 unsigned int el1r; 136 137 if (!vcpu_get_flag(vcpu, SYSREGS_ON_CPU)) 138 goto memory_read; 139 140 if (unlikely(get_el2_to_el1_mapping(reg, &el1r, &xlate))) { 141 if (!is_hyp_ctxt(vcpu)) 142 goto memory_read; 143 144 /* 145 * If this register does not have an EL1 counterpart, 146 * then read the stored EL2 version. 147 */ 148 if (reg == el1r) 149 goto memory_read; 150 151 /* 152 * If we have a non-VHE guest and that the sysreg 153 * requires translation to be used at EL1, use the 154 * in-memory copy instead. 155 */ 156 if (!vcpu_el2_e2h_is_set(vcpu) && xlate) 157 goto memory_read; 158 159 /* Get the current version of the EL1 counterpart. */ 160 WARN_ON(!__vcpu_read_sys_reg_from_cpu(el1r, &val)); 161 return val; 162 } 163 164 /* EL1 register can't be on the CPU if the guest is in vEL2. */ 165 if (unlikely(is_hyp_ctxt(vcpu))) 166 goto memory_read; 167 168 if (__vcpu_read_sys_reg_from_cpu(reg, &val)) 169 return val; 170 171 memory_read: 172 return __vcpu_sys_reg(vcpu, reg); 173 } 174 175 void vcpu_write_sys_reg(struct kvm_vcpu *vcpu, u64 val, int reg) 176 { 177 u64 (*xlate)(u64) = NULL; 178 unsigned int el1r; 179 180 if (!vcpu_get_flag(vcpu, SYSREGS_ON_CPU)) 181 goto memory_write; 182 183 if (unlikely(get_el2_to_el1_mapping(reg, &el1r, &xlate))) { 184 if (!is_hyp_ctxt(vcpu)) 185 goto memory_write; 186 187 /* 188 * Always store a copy of the write to memory to avoid having 189 * to reverse-translate virtual EL2 system registers for a 190 * non-VHE guest hypervisor. 191 */ 192 __vcpu_sys_reg(vcpu, reg) = val; 193 194 /* No EL1 counterpart? We're done here.? */ 195 if (reg == el1r) 196 return; 197 198 if (!vcpu_el2_e2h_is_set(vcpu) && xlate) 199 val = xlate(val); 200 201 /* Redirect this to the EL1 version of the register. */ 202 WARN_ON(!__vcpu_write_sys_reg_to_cpu(val, el1r)); 203 return; 204 } 205 206 /* EL1 register can't be on the CPU if the guest is in vEL2. */ 207 if (unlikely(is_hyp_ctxt(vcpu))) 208 goto memory_write; 209 210 if (__vcpu_write_sys_reg_to_cpu(val, reg)) 211 return; 212 213 memory_write: 214 __vcpu_sys_reg(vcpu, reg) = val; 215 } 216 217 /* CSSELR values; used to index KVM_REG_ARM_DEMUX_ID_CCSIDR */ 218 #define CSSELR_MAX 14 219 220 /* 221 * Returns the minimum line size for the selected cache, expressed as 222 * Log2(bytes). 223 */ 224 static u8 get_min_cache_line_size(bool icache) 225 { 226 u64 ctr = read_sanitised_ftr_reg(SYS_CTR_EL0); 227 u8 field; 228 229 if (icache) 230 field = SYS_FIELD_GET(CTR_EL0, IminLine, ctr); 231 else 232 field = SYS_FIELD_GET(CTR_EL0, DminLine, ctr); 233 234 /* 235 * Cache line size is represented as Log2(words) in CTR_EL0. 236 * Log2(bytes) can be derived with the following: 237 * 238 * Log2(words) + 2 = Log2(bytes / 4) + 2 239 * = Log2(bytes) - 2 + 2 240 * = Log2(bytes) 241 */ 242 return field + 2; 243 } 244 245 /* Which cache CCSIDR represents depends on CSSELR value. */ 246 static u32 get_ccsidr(struct kvm_vcpu *vcpu, u32 csselr) 247 { 248 u8 line_size; 249 250 if (vcpu->arch.ccsidr) 251 return vcpu->arch.ccsidr[csselr]; 252 253 line_size = get_min_cache_line_size(csselr & CSSELR_EL1_InD); 254 255 /* 256 * Fabricate a CCSIDR value as the overriding value does not exist. 257 * The real CCSIDR value will not be used as it can vary by the 258 * physical CPU which the vcpu currently resides in. 259 * 260 * The line size is determined with get_min_cache_line_size(), which 261 * should be valid for all CPUs even if they have different cache 262 * configuration. 263 * 264 * The associativity bits are cleared, meaning the geometry of all data 265 * and unified caches (which are guaranteed to be PIPT and thus 266 * non-aliasing) are 1 set and 1 way. 267 * Guests should not be doing cache operations by set/way at all, and 268 * for this reason, we trap them and attempt to infer the intent, so 269 * that we can flush the entire guest's address space at the appropriate 270 * time. The exposed geometry minimizes the number of the traps. 271 * [If guests should attempt to infer aliasing properties from the 272 * geometry (which is not permitted by the architecture), they would 273 * only do so for virtually indexed caches.] 274 * 275 * We don't check if the cache level exists as it is allowed to return 276 * an UNKNOWN value if not. 277 */ 278 return SYS_FIELD_PREP(CCSIDR_EL1, LineSize, line_size - 4); 279 } 280 281 static int set_ccsidr(struct kvm_vcpu *vcpu, u32 csselr, u32 val) 282 { 283 u8 line_size = FIELD_GET(CCSIDR_EL1_LineSize, val) + 4; 284 u32 *ccsidr = vcpu->arch.ccsidr; 285 u32 i; 286 287 if ((val & CCSIDR_EL1_RES0) || 288 line_size < get_min_cache_line_size(csselr & CSSELR_EL1_InD)) 289 return -EINVAL; 290 291 if (!ccsidr) { 292 if (val == get_ccsidr(vcpu, csselr)) 293 return 0; 294 295 ccsidr = kmalloc_array(CSSELR_MAX, sizeof(u32), GFP_KERNEL_ACCOUNT); 296 if (!ccsidr) 297 return -ENOMEM; 298 299 for (i = 0; i < CSSELR_MAX; i++) 300 ccsidr[i] = get_ccsidr(vcpu, i); 301 302 vcpu->arch.ccsidr = ccsidr; 303 } 304 305 ccsidr[csselr] = val; 306 307 return 0; 308 } 309 310 static bool access_rw(struct kvm_vcpu *vcpu, 311 struct sys_reg_params *p, 312 const struct sys_reg_desc *r) 313 { 314 if (p->is_write) 315 vcpu_write_sys_reg(vcpu, p->regval, r->reg); 316 else 317 p->regval = vcpu_read_sys_reg(vcpu, r->reg); 318 319 return true; 320 } 321 322 /* 323 * See note at ARMv7 ARM B1.14.4 (TL;DR: S/W ops are not easily virtualized). 324 */ 325 static bool access_dcsw(struct kvm_vcpu *vcpu, 326 struct sys_reg_params *p, 327 const struct sys_reg_desc *r) 328 { 329 if (!p->is_write) 330 return read_from_write_only(vcpu, p, r); 331 332 /* 333 * Only track S/W ops if we don't have FWB. It still indicates 334 * that the guest is a bit broken (S/W operations should only 335 * be done by firmware, knowing that there is only a single 336 * CPU left in the system, and certainly not from non-secure 337 * software). 338 */ 339 if (!cpus_have_final_cap(ARM64_HAS_STAGE2_FWB)) 340 kvm_set_way_flush(vcpu); 341 342 return true; 343 } 344 345 static bool access_dcgsw(struct kvm_vcpu *vcpu, 346 struct sys_reg_params *p, 347 const struct sys_reg_desc *r) 348 { 349 if (!kvm_has_mte(vcpu->kvm)) { 350 kvm_inject_undefined(vcpu); 351 return false; 352 } 353 354 /* Treat MTE S/W ops as we treat the classic ones: with contempt */ 355 return access_dcsw(vcpu, p, r); 356 } 357 358 static void get_access_mask(const struct sys_reg_desc *r, u64 *mask, u64 *shift) 359 { 360 switch (r->aarch32_map) { 361 case AA32_LO: 362 *mask = GENMASK_ULL(31, 0); 363 *shift = 0; 364 break; 365 case AA32_HI: 366 *mask = GENMASK_ULL(63, 32); 367 *shift = 32; 368 break; 369 default: 370 *mask = GENMASK_ULL(63, 0); 371 *shift = 0; 372 break; 373 } 374 } 375 376 /* 377 * Generic accessor for VM registers. Only called as long as HCR_TVM 378 * is set. If the guest enables the MMU, we stop trapping the VM 379 * sys_regs and leave it in complete control of the caches. 380 */ 381 static bool access_vm_reg(struct kvm_vcpu *vcpu, 382 struct sys_reg_params *p, 383 const struct sys_reg_desc *r) 384 { 385 bool was_enabled = vcpu_has_cache_enabled(vcpu); 386 u64 val, mask, shift; 387 388 if (reg_to_encoding(r) == SYS_TCR2_EL1 && 389 !kvm_has_feat(vcpu->kvm, ID_AA64MMFR3_EL1, TCRX, IMP)) { 390 kvm_inject_undefined(vcpu); 391 return false; 392 } 393 394 BUG_ON(!p->is_write); 395 396 get_access_mask(r, &mask, &shift); 397 398 if (~mask) { 399 val = vcpu_read_sys_reg(vcpu, r->reg); 400 val &= ~mask; 401 } else { 402 val = 0; 403 } 404 405 val |= (p->regval & (mask >> shift)) << shift; 406 vcpu_write_sys_reg(vcpu, val, r->reg); 407 408 kvm_toggle_cache(vcpu, was_enabled); 409 return true; 410 } 411 412 static bool access_actlr(struct kvm_vcpu *vcpu, 413 struct sys_reg_params *p, 414 const struct sys_reg_desc *r) 415 { 416 u64 mask, shift; 417 418 if (p->is_write) 419 return ignore_write(vcpu, p); 420 421 get_access_mask(r, &mask, &shift); 422 p->regval = (vcpu_read_sys_reg(vcpu, r->reg) & mask) >> shift; 423 424 return true; 425 } 426 427 /* 428 * Trap handler for the GICv3 SGI generation system register. 429 * Forward the request to the VGIC emulation. 430 * The cp15_64 code makes sure this automatically works 431 * for both AArch64 and AArch32 accesses. 432 */ 433 static bool access_gic_sgi(struct kvm_vcpu *vcpu, 434 struct sys_reg_params *p, 435 const struct sys_reg_desc *r) 436 { 437 bool g1; 438 439 if (!kvm_has_gicv3(vcpu->kvm)) { 440 kvm_inject_undefined(vcpu); 441 return false; 442 } 443 444 if (!p->is_write) 445 return read_from_write_only(vcpu, p, r); 446 447 /* 448 * In a system where GICD_CTLR.DS=1, a ICC_SGI0R_EL1 access generates 449 * Group0 SGIs only, while ICC_SGI1R_EL1 can generate either group, 450 * depending on the SGI configuration. ICC_ASGI1R_EL1 is effectively 451 * equivalent to ICC_SGI0R_EL1, as there is no "alternative" secure 452 * group. 453 */ 454 if (p->Op0 == 0) { /* AArch32 */ 455 switch (p->Op1) { 456 default: /* Keep GCC quiet */ 457 case 0: /* ICC_SGI1R */ 458 g1 = true; 459 break; 460 case 1: /* ICC_ASGI1R */ 461 case 2: /* ICC_SGI0R */ 462 g1 = false; 463 break; 464 } 465 } else { /* AArch64 */ 466 switch (p->Op2) { 467 default: /* Keep GCC quiet */ 468 case 5: /* ICC_SGI1R_EL1 */ 469 g1 = true; 470 break; 471 case 6: /* ICC_ASGI1R_EL1 */ 472 case 7: /* ICC_SGI0R_EL1 */ 473 g1 = false; 474 break; 475 } 476 } 477 478 vgic_v3_dispatch_sgi(vcpu, p->regval, g1); 479 480 return true; 481 } 482 483 static bool access_gic_sre(struct kvm_vcpu *vcpu, 484 struct sys_reg_params *p, 485 const struct sys_reg_desc *r) 486 { 487 if (p->is_write) 488 return ignore_write(vcpu, p); 489 490 p->regval = vcpu->arch.vgic_cpu.vgic_v3.vgic_sre; 491 return true; 492 } 493 494 static bool trap_raz_wi(struct kvm_vcpu *vcpu, 495 struct sys_reg_params *p, 496 const struct sys_reg_desc *r) 497 { 498 if (p->is_write) 499 return ignore_write(vcpu, p); 500 else 501 return read_zero(vcpu, p); 502 } 503 504 static bool trap_undef(struct kvm_vcpu *vcpu, 505 struct sys_reg_params *p, 506 const struct sys_reg_desc *r) 507 { 508 kvm_inject_undefined(vcpu); 509 return false; 510 } 511 512 /* 513 * ARMv8.1 mandates at least a trivial LORegion implementation, where all the 514 * RW registers are RES0 (which we can implement as RAZ/WI). On an ARMv8.0 515 * system, these registers should UNDEF. LORID_EL1 being a RO register, we 516 * treat it separately. 517 */ 518 static bool trap_loregion(struct kvm_vcpu *vcpu, 519 struct sys_reg_params *p, 520 const struct sys_reg_desc *r) 521 { 522 u32 sr = reg_to_encoding(r); 523 524 if (!kvm_has_feat(vcpu->kvm, ID_AA64MMFR1_EL1, LO, IMP)) { 525 kvm_inject_undefined(vcpu); 526 return false; 527 } 528 529 if (p->is_write && sr == SYS_LORID_EL1) 530 return write_to_read_only(vcpu, p, r); 531 532 return trap_raz_wi(vcpu, p, r); 533 } 534 535 static bool trap_oslar_el1(struct kvm_vcpu *vcpu, 536 struct sys_reg_params *p, 537 const struct sys_reg_desc *r) 538 { 539 u64 oslsr; 540 541 if (!p->is_write) 542 return read_from_write_only(vcpu, p, r); 543 544 /* Forward the OSLK bit to OSLSR */ 545 oslsr = __vcpu_sys_reg(vcpu, OSLSR_EL1) & ~OSLSR_EL1_OSLK; 546 if (p->regval & OSLAR_EL1_OSLK) 547 oslsr |= OSLSR_EL1_OSLK; 548 549 __vcpu_sys_reg(vcpu, OSLSR_EL1) = oslsr; 550 return true; 551 } 552 553 static bool trap_oslsr_el1(struct kvm_vcpu *vcpu, 554 struct sys_reg_params *p, 555 const struct sys_reg_desc *r) 556 { 557 if (p->is_write) 558 return write_to_read_only(vcpu, p, r); 559 560 p->regval = __vcpu_sys_reg(vcpu, r->reg); 561 return true; 562 } 563 564 static int set_oslsr_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 565 u64 val) 566 { 567 /* 568 * The only modifiable bit is the OSLK bit. Refuse the write if 569 * userspace attempts to change any other bit in the register. 570 */ 571 if ((val ^ rd->val) & ~OSLSR_EL1_OSLK) 572 return -EINVAL; 573 574 __vcpu_sys_reg(vcpu, rd->reg) = val; 575 return 0; 576 } 577 578 static bool trap_dbgauthstatus_el1(struct kvm_vcpu *vcpu, 579 struct sys_reg_params *p, 580 const struct sys_reg_desc *r) 581 { 582 if (p->is_write) { 583 return ignore_write(vcpu, p); 584 } else { 585 p->regval = read_sysreg(dbgauthstatus_el1); 586 return true; 587 } 588 } 589 590 /* 591 * We want to avoid world-switching all the DBG registers all the 592 * time: 593 * 594 * - If we've touched any debug register, it is likely that we're 595 * going to touch more of them. It then makes sense to disable the 596 * traps and start doing the save/restore dance 597 * - If debug is active (DBG_MDSCR_KDE or DBG_MDSCR_MDE set), it is 598 * then mandatory to save/restore the registers, as the guest 599 * depends on them. 600 * 601 * For this, we use a DIRTY bit, indicating the guest has modified the 602 * debug registers, used as follow: 603 * 604 * On guest entry: 605 * - If the dirty bit is set (because we're coming back from trapping), 606 * disable the traps, save host registers, restore guest registers. 607 * - If debug is actively in use (DBG_MDSCR_KDE or DBG_MDSCR_MDE set), 608 * set the dirty bit, disable the traps, save host registers, 609 * restore guest registers. 610 * - Otherwise, enable the traps 611 * 612 * On guest exit: 613 * - If the dirty bit is set, save guest registers, restore host 614 * registers and clear the dirty bit. This ensure that the host can 615 * now use the debug registers. 616 */ 617 static bool trap_debug_regs(struct kvm_vcpu *vcpu, 618 struct sys_reg_params *p, 619 const struct sys_reg_desc *r) 620 { 621 access_rw(vcpu, p, r); 622 if (p->is_write) 623 vcpu_set_flag(vcpu, DEBUG_DIRTY); 624 625 trace_trap_reg(__func__, r->reg, p->is_write, p->regval); 626 627 return true; 628 } 629 630 /* 631 * reg_to_dbg/dbg_to_reg 632 * 633 * A 32 bit write to a debug register leave top bits alone 634 * A 32 bit read from a debug register only returns the bottom bits 635 * 636 * All writes will set the DEBUG_DIRTY flag to ensure the hyp code 637 * switches between host and guest values in future. 638 */ 639 static void reg_to_dbg(struct kvm_vcpu *vcpu, 640 struct sys_reg_params *p, 641 const struct sys_reg_desc *rd, 642 u64 *dbg_reg) 643 { 644 u64 mask, shift, val; 645 646 get_access_mask(rd, &mask, &shift); 647 648 val = *dbg_reg; 649 val &= ~mask; 650 val |= (p->regval & (mask >> shift)) << shift; 651 *dbg_reg = val; 652 653 vcpu_set_flag(vcpu, DEBUG_DIRTY); 654 } 655 656 static void dbg_to_reg(struct kvm_vcpu *vcpu, 657 struct sys_reg_params *p, 658 const struct sys_reg_desc *rd, 659 u64 *dbg_reg) 660 { 661 u64 mask, shift; 662 663 get_access_mask(rd, &mask, &shift); 664 p->regval = (*dbg_reg & mask) >> shift; 665 } 666 667 static bool trap_bvr(struct kvm_vcpu *vcpu, 668 struct sys_reg_params *p, 669 const struct sys_reg_desc *rd) 670 { 671 u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->CRm]; 672 673 if (p->is_write) 674 reg_to_dbg(vcpu, p, rd, dbg_reg); 675 else 676 dbg_to_reg(vcpu, p, rd, dbg_reg); 677 678 trace_trap_reg(__func__, rd->CRm, p->is_write, *dbg_reg); 679 680 return true; 681 } 682 683 static int set_bvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 684 u64 val) 685 { 686 vcpu->arch.vcpu_debug_state.dbg_bvr[rd->CRm] = val; 687 return 0; 688 } 689 690 static int get_bvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 691 u64 *val) 692 { 693 *val = vcpu->arch.vcpu_debug_state.dbg_bvr[rd->CRm]; 694 return 0; 695 } 696 697 static u64 reset_bvr(struct kvm_vcpu *vcpu, 698 const struct sys_reg_desc *rd) 699 { 700 vcpu->arch.vcpu_debug_state.dbg_bvr[rd->CRm] = rd->val; 701 return rd->val; 702 } 703 704 static bool trap_bcr(struct kvm_vcpu *vcpu, 705 struct sys_reg_params *p, 706 const struct sys_reg_desc *rd) 707 { 708 u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bcr[rd->CRm]; 709 710 if (p->is_write) 711 reg_to_dbg(vcpu, p, rd, dbg_reg); 712 else 713 dbg_to_reg(vcpu, p, rd, dbg_reg); 714 715 trace_trap_reg(__func__, rd->CRm, p->is_write, *dbg_reg); 716 717 return true; 718 } 719 720 static int set_bcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 721 u64 val) 722 { 723 vcpu->arch.vcpu_debug_state.dbg_bcr[rd->CRm] = val; 724 return 0; 725 } 726 727 static int get_bcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 728 u64 *val) 729 { 730 *val = vcpu->arch.vcpu_debug_state.dbg_bcr[rd->CRm]; 731 return 0; 732 } 733 734 static u64 reset_bcr(struct kvm_vcpu *vcpu, 735 const struct sys_reg_desc *rd) 736 { 737 vcpu->arch.vcpu_debug_state.dbg_bcr[rd->CRm] = rd->val; 738 return rd->val; 739 } 740 741 static bool trap_wvr(struct kvm_vcpu *vcpu, 742 struct sys_reg_params *p, 743 const struct sys_reg_desc *rd) 744 { 745 u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm]; 746 747 if (p->is_write) 748 reg_to_dbg(vcpu, p, rd, dbg_reg); 749 else 750 dbg_to_reg(vcpu, p, rd, dbg_reg); 751 752 trace_trap_reg(__func__, rd->CRm, p->is_write, 753 vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm]); 754 755 return true; 756 } 757 758 static int set_wvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 759 u64 val) 760 { 761 vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm] = val; 762 return 0; 763 } 764 765 static int get_wvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 766 u64 *val) 767 { 768 *val = vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm]; 769 return 0; 770 } 771 772 static u64 reset_wvr(struct kvm_vcpu *vcpu, 773 const struct sys_reg_desc *rd) 774 { 775 vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm] = rd->val; 776 return rd->val; 777 } 778 779 static bool trap_wcr(struct kvm_vcpu *vcpu, 780 struct sys_reg_params *p, 781 const struct sys_reg_desc *rd) 782 { 783 u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_wcr[rd->CRm]; 784 785 if (p->is_write) 786 reg_to_dbg(vcpu, p, rd, dbg_reg); 787 else 788 dbg_to_reg(vcpu, p, rd, dbg_reg); 789 790 trace_trap_reg(__func__, rd->CRm, p->is_write, *dbg_reg); 791 792 return true; 793 } 794 795 static int set_wcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 796 u64 val) 797 { 798 vcpu->arch.vcpu_debug_state.dbg_wcr[rd->CRm] = val; 799 return 0; 800 } 801 802 static int get_wcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 803 u64 *val) 804 { 805 *val = vcpu->arch.vcpu_debug_state.dbg_wcr[rd->CRm]; 806 return 0; 807 } 808 809 static u64 reset_wcr(struct kvm_vcpu *vcpu, 810 const struct sys_reg_desc *rd) 811 { 812 vcpu->arch.vcpu_debug_state.dbg_wcr[rd->CRm] = rd->val; 813 return rd->val; 814 } 815 816 static u64 reset_amair_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 817 { 818 u64 amair = read_sysreg(amair_el1); 819 vcpu_write_sys_reg(vcpu, amair, AMAIR_EL1); 820 return amair; 821 } 822 823 static u64 reset_actlr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 824 { 825 u64 actlr = read_sysreg(actlr_el1); 826 vcpu_write_sys_reg(vcpu, actlr, ACTLR_EL1); 827 return actlr; 828 } 829 830 static u64 reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 831 { 832 u64 mpidr; 833 834 /* 835 * Map the vcpu_id into the first three affinity level fields of 836 * the MPIDR. We limit the number of VCPUs in level 0 due to a 837 * limitation to 16 CPUs in that level in the ICC_SGIxR registers 838 * of the GICv3 to be able to address each CPU directly when 839 * sending IPIs. 840 */ 841 mpidr = (vcpu->vcpu_id & 0x0f) << MPIDR_LEVEL_SHIFT(0); 842 mpidr |= ((vcpu->vcpu_id >> 4) & 0xff) << MPIDR_LEVEL_SHIFT(1); 843 mpidr |= ((vcpu->vcpu_id >> 12) & 0xff) << MPIDR_LEVEL_SHIFT(2); 844 mpidr |= (1ULL << 31); 845 vcpu_write_sys_reg(vcpu, mpidr, MPIDR_EL1); 846 847 return mpidr; 848 } 849 850 static unsigned int pmu_visibility(const struct kvm_vcpu *vcpu, 851 const struct sys_reg_desc *r) 852 { 853 if (kvm_vcpu_has_pmu(vcpu)) 854 return 0; 855 856 return REG_HIDDEN; 857 } 858 859 static u64 reset_pmu_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 860 { 861 u64 mask = BIT(ARMV8_PMU_CYCLE_IDX); 862 u8 n = vcpu->kvm->arch.pmcr_n; 863 864 if (n) 865 mask |= GENMASK(n - 1, 0); 866 867 reset_unknown(vcpu, r); 868 __vcpu_sys_reg(vcpu, r->reg) &= mask; 869 870 return __vcpu_sys_reg(vcpu, r->reg); 871 } 872 873 static u64 reset_pmevcntr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 874 { 875 reset_unknown(vcpu, r); 876 __vcpu_sys_reg(vcpu, r->reg) &= GENMASK(31, 0); 877 878 return __vcpu_sys_reg(vcpu, r->reg); 879 } 880 881 static u64 reset_pmevtyper(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 882 { 883 /* This thing will UNDEF, who cares about the reset value? */ 884 if (!kvm_vcpu_has_pmu(vcpu)) 885 return 0; 886 887 reset_unknown(vcpu, r); 888 __vcpu_sys_reg(vcpu, r->reg) &= kvm_pmu_evtyper_mask(vcpu->kvm); 889 890 return __vcpu_sys_reg(vcpu, r->reg); 891 } 892 893 static u64 reset_pmselr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 894 { 895 reset_unknown(vcpu, r); 896 __vcpu_sys_reg(vcpu, r->reg) &= ARMV8_PMU_COUNTER_MASK; 897 898 return __vcpu_sys_reg(vcpu, r->reg); 899 } 900 901 static u64 reset_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 902 { 903 u64 pmcr = 0; 904 905 if (!kvm_supports_32bit_el0()) 906 pmcr |= ARMV8_PMU_PMCR_LC; 907 908 /* 909 * The value of PMCR.N field is included when the 910 * vCPU register is read via kvm_vcpu_read_pmcr(). 911 */ 912 __vcpu_sys_reg(vcpu, r->reg) = pmcr; 913 914 return __vcpu_sys_reg(vcpu, r->reg); 915 } 916 917 static bool check_pmu_access_disabled(struct kvm_vcpu *vcpu, u64 flags) 918 { 919 u64 reg = __vcpu_sys_reg(vcpu, PMUSERENR_EL0); 920 bool enabled = (reg & flags) || vcpu_mode_priv(vcpu); 921 922 if (!enabled) 923 kvm_inject_undefined(vcpu); 924 925 return !enabled; 926 } 927 928 static bool pmu_access_el0_disabled(struct kvm_vcpu *vcpu) 929 { 930 return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_EN); 931 } 932 933 static bool pmu_write_swinc_el0_disabled(struct kvm_vcpu *vcpu) 934 { 935 return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_SW | ARMV8_PMU_USERENR_EN); 936 } 937 938 static bool pmu_access_cycle_counter_el0_disabled(struct kvm_vcpu *vcpu) 939 { 940 return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_CR | ARMV8_PMU_USERENR_EN); 941 } 942 943 static bool pmu_access_event_counter_el0_disabled(struct kvm_vcpu *vcpu) 944 { 945 return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_ER | ARMV8_PMU_USERENR_EN); 946 } 947 948 static bool access_pmcr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 949 const struct sys_reg_desc *r) 950 { 951 u64 val; 952 953 if (pmu_access_el0_disabled(vcpu)) 954 return false; 955 956 if (p->is_write) { 957 /* 958 * Only update writeable bits of PMCR (continuing into 959 * kvm_pmu_handle_pmcr() as well) 960 */ 961 val = kvm_vcpu_read_pmcr(vcpu); 962 val &= ~ARMV8_PMU_PMCR_MASK; 963 val |= p->regval & ARMV8_PMU_PMCR_MASK; 964 if (!kvm_supports_32bit_el0()) 965 val |= ARMV8_PMU_PMCR_LC; 966 kvm_pmu_handle_pmcr(vcpu, val); 967 } else { 968 /* PMCR.P & PMCR.C are RAZ */ 969 val = kvm_vcpu_read_pmcr(vcpu) 970 & ~(ARMV8_PMU_PMCR_P | ARMV8_PMU_PMCR_C); 971 p->regval = val; 972 } 973 974 return true; 975 } 976 977 static bool access_pmselr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 978 const struct sys_reg_desc *r) 979 { 980 if (pmu_access_event_counter_el0_disabled(vcpu)) 981 return false; 982 983 if (p->is_write) 984 __vcpu_sys_reg(vcpu, PMSELR_EL0) = p->regval; 985 else 986 /* return PMSELR.SEL field */ 987 p->regval = __vcpu_sys_reg(vcpu, PMSELR_EL0) 988 & ARMV8_PMU_COUNTER_MASK; 989 990 return true; 991 } 992 993 static bool access_pmceid(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 994 const struct sys_reg_desc *r) 995 { 996 u64 pmceid, mask, shift; 997 998 BUG_ON(p->is_write); 999 1000 if (pmu_access_el0_disabled(vcpu)) 1001 return false; 1002 1003 get_access_mask(r, &mask, &shift); 1004 1005 pmceid = kvm_pmu_get_pmceid(vcpu, (p->Op2 & 1)); 1006 pmceid &= mask; 1007 pmceid >>= shift; 1008 1009 p->regval = pmceid; 1010 1011 return true; 1012 } 1013 1014 static bool pmu_counter_idx_valid(struct kvm_vcpu *vcpu, u64 idx) 1015 { 1016 u64 pmcr, val; 1017 1018 pmcr = kvm_vcpu_read_pmcr(vcpu); 1019 val = FIELD_GET(ARMV8_PMU_PMCR_N, pmcr); 1020 if (idx >= val && idx != ARMV8_PMU_CYCLE_IDX) { 1021 kvm_inject_undefined(vcpu); 1022 return false; 1023 } 1024 1025 return true; 1026 } 1027 1028 static int get_pmu_evcntr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r, 1029 u64 *val) 1030 { 1031 u64 idx; 1032 1033 if (r->CRn == 9 && r->CRm == 13 && r->Op2 == 0) 1034 /* PMCCNTR_EL0 */ 1035 idx = ARMV8_PMU_CYCLE_IDX; 1036 else 1037 /* PMEVCNTRn_EL0 */ 1038 idx = ((r->CRm & 3) << 3) | (r->Op2 & 7); 1039 1040 *val = kvm_pmu_get_counter_value(vcpu, idx); 1041 return 0; 1042 } 1043 1044 static bool access_pmu_evcntr(struct kvm_vcpu *vcpu, 1045 struct sys_reg_params *p, 1046 const struct sys_reg_desc *r) 1047 { 1048 u64 idx = ~0UL; 1049 1050 if (r->CRn == 9 && r->CRm == 13) { 1051 if (r->Op2 == 2) { 1052 /* PMXEVCNTR_EL0 */ 1053 if (pmu_access_event_counter_el0_disabled(vcpu)) 1054 return false; 1055 1056 idx = __vcpu_sys_reg(vcpu, PMSELR_EL0) 1057 & ARMV8_PMU_COUNTER_MASK; 1058 } else if (r->Op2 == 0) { 1059 /* PMCCNTR_EL0 */ 1060 if (pmu_access_cycle_counter_el0_disabled(vcpu)) 1061 return false; 1062 1063 idx = ARMV8_PMU_CYCLE_IDX; 1064 } 1065 } else if (r->CRn == 0 && r->CRm == 9) { 1066 /* PMCCNTR */ 1067 if (pmu_access_event_counter_el0_disabled(vcpu)) 1068 return false; 1069 1070 idx = ARMV8_PMU_CYCLE_IDX; 1071 } else if (r->CRn == 14 && (r->CRm & 12) == 8) { 1072 /* PMEVCNTRn_EL0 */ 1073 if (pmu_access_event_counter_el0_disabled(vcpu)) 1074 return false; 1075 1076 idx = ((r->CRm & 3) << 3) | (r->Op2 & 7); 1077 } 1078 1079 /* Catch any decoding mistake */ 1080 WARN_ON(idx == ~0UL); 1081 1082 if (!pmu_counter_idx_valid(vcpu, idx)) 1083 return false; 1084 1085 if (p->is_write) { 1086 if (pmu_access_el0_disabled(vcpu)) 1087 return false; 1088 1089 kvm_pmu_set_counter_value(vcpu, idx, p->regval); 1090 } else { 1091 p->regval = kvm_pmu_get_counter_value(vcpu, idx); 1092 } 1093 1094 return true; 1095 } 1096 1097 static bool access_pmu_evtyper(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1098 const struct sys_reg_desc *r) 1099 { 1100 u64 idx, reg; 1101 1102 if (pmu_access_el0_disabled(vcpu)) 1103 return false; 1104 1105 if (r->CRn == 9 && r->CRm == 13 && r->Op2 == 1) { 1106 /* PMXEVTYPER_EL0 */ 1107 idx = __vcpu_sys_reg(vcpu, PMSELR_EL0) & ARMV8_PMU_COUNTER_MASK; 1108 reg = PMEVTYPER0_EL0 + idx; 1109 } else if (r->CRn == 14 && (r->CRm & 12) == 12) { 1110 idx = ((r->CRm & 3) << 3) | (r->Op2 & 7); 1111 if (idx == ARMV8_PMU_CYCLE_IDX) 1112 reg = PMCCFILTR_EL0; 1113 else 1114 /* PMEVTYPERn_EL0 */ 1115 reg = PMEVTYPER0_EL0 + idx; 1116 } else { 1117 BUG(); 1118 } 1119 1120 if (!pmu_counter_idx_valid(vcpu, idx)) 1121 return false; 1122 1123 if (p->is_write) { 1124 kvm_pmu_set_counter_event_type(vcpu, p->regval, idx); 1125 kvm_vcpu_pmu_restore_guest(vcpu); 1126 } else { 1127 p->regval = __vcpu_sys_reg(vcpu, reg); 1128 } 1129 1130 return true; 1131 } 1132 1133 static int set_pmreg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r, u64 val) 1134 { 1135 bool set; 1136 1137 val &= kvm_pmu_valid_counter_mask(vcpu); 1138 1139 switch (r->reg) { 1140 case PMOVSSET_EL0: 1141 /* CRm[1] being set indicates a SET register, and CLR otherwise */ 1142 set = r->CRm & 2; 1143 break; 1144 default: 1145 /* Op2[0] being set indicates a SET register, and CLR otherwise */ 1146 set = r->Op2 & 1; 1147 break; 1148 } 1149 1150 if (set) 1151 __vcpu_sys_reg(vcpu, r->reg) |= val; 1152 else 1153 __vcpu_sys_reg(vcpu, r->reg) &= ~val; 1154 1155 return 0; 1156 } 1157 1158 static int get_pmreg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r, u64 *val) 1159 { 1160 u64 mask = kvm_pmu_valid_counter_mask(vcpu); 1161 1162 *val = __vcpu_sys_reg(vcpu, r->reg) & mask; 1163 return 0; 1164 } 1165 1166 static bool access_pmcnten(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1167 const struct sys_reg_desc *r) 1168 { 1169 u64 val, mask; 1170 1171 if (pmu_access_el0_disabled(vcpu)) 1172 return false; 1173 1174 mask = kvm_pmu_valid_counter_mask(vcpu); 1175 if (p->is_write) { 1176 val = p->regval & mask; 1177 if (r->Op2 & 0x1) { 1178 /* accessing PMCNTENSET_EL0 */ 1179 __vcpu_sys_reg(vcpu, PMCNTENSET_EL0) |= val; 1180 kvm_pmu_enable_counter_mask(vcpu, val); 1181 kvm_vcpu_pmu_restore_guest(vcpu); 1182 } else { 1183 /* accessing PMCNTENCLR_EL0 */ 1184 __vcpu_sys_reg(vcpu, PMCNTENSET_EL0) &= ~val; 1185 kvm_pmu_disable_counter_mask(vcpu, val); 1186 } 1187 } else { 1188 p->regval = __vcpu_sys_reg(vcpu, PMCNTENSET_EL0); 1189 } 1190 1191 return true; 1192 } 1193 1194 static bool access_pminten(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1195 const struct sys_reg_desc *r) 1196 { 1197 u64 mask = kvm_pmu_valid_counter_mask(vcpu); 1198 1199 if (check_pmu_access_disabled(vcpu, 0)) 1200 return false; 1201 1202 if (p->is_write) { 1203 u64 val = p->regval & mask; 1204 1205 if (r->Op2 & 0x1) 1206 /* accessing PMINTENSET_EL1 */ 1207 __vcpu_sys_reg(vcpu, PMINTENSET_EL1) |= val; 1208 else 1209 /* accessing PMINTENCLR_EL1 */ 1210 __vcpu_sys_reg(vcpu, PMINTENSET_EL1) &= ~val; 1211 } else { 1212 p->regval = __vcpu_sys_reg(vcpu, PMINTENSET_EL1); 1213 } 1214 1215 return true; 1216 } 1217 1218 static bool access_pmovs(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1219 const struct sys_reg_desc *r) 1220 { 1221 u64 mask = kvm_pmu_valid_counter_mask(vcpu); 1222 1223 if (pmu_access_el0_disabled(vcpu)) 1224 return false; 1225 1226 if (p->is_write) { 1227 if (r->CRm & 0x2) 1228 /* accessing PMOVSSET_EL0 */ 1229 __vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= (p->regval & mask); 1230 else 1231 /* accessing PMOVSCLR_EL0 */ 1232 __vcpu_sys_reg(vcpu, PMOVSSET_EL0) &= ~(p->regval & mask); 1233 } else { 1234 p->regval = __vcpu_sys_reg(vcpu, PMOVSSET_EL0); 1235 } 1236 1237 return true; 1238 } 1239 1240 static bool access_pmswinc(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1241 const struct sys_reg_desc *r) 1242 { 1243 u64 mask; 1244 1245 if (!p->is_write) 1246 return read_from_write_only(vcpu, p, r); 1247 1248 if (pmu_write_swinc_el0_disabled(vcpu)) 1249 return false; 1250 1251 mask = kvm_pmu_valid_counter_mask(vcpu); 1252 kvm_pmu_software_increment(vcpu, p->regval & mask); 1253 return true; 1254 } 1255 1256 static bool access_pmuserenr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1257 const struct sys_reg_desc *r) 1258 { 1259 if (p->is_write) { 1260 if (!vcpu_mode_priv(vcpu)) { 1261 kvm_inject_undefined(vcpu); 1262 return false; 1263 } 1264 1265 __vcpu_sys_reg(vcpu, PMUSERENR_EL0) = 1266 p->regval & ARMV8_PMU_USERENR_MASK; 1267 } else { 1268 p->regval = __vcpu_sys_reg(vcpu, PMUSERENR_EL0) 1269 & ARMV8_PMU_USERENR_MASK; 1270 } 1271 1272 return true; 1273 } 1274 1275 static int get_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r, 1276 u64 *val) 1277 { 1278 *val = kvm_vcpu_read_pmcr(vcpu); 1279 return 0; 1280 } 1281 1282 static int set_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r, 1283 u64 val) 1284 { 1285 u8 new_n = FIELD_GET(ARMV8_PMU_PMCR_N, val); 1286 struct kvm *kvm = vcpu->kvm; 1287 1288 mutex_lock(&kvm->arch.config_lock); 1289 1290 /* 1291 * The vCPU can't have more counters than the PMU hardware 1292 * implements. Ignore this error to maintain compatibility 1293 * with the existing KVM behavior. 1294 */ 1295 if (!kvm_vm_has_ran_once(kvm) && 1296 new_n <= kvm_arm_pmu_get_max_counters(kvm)) 1297 kvm->arch.pmcr_n = new_n; 1298 1299 mutex_unlock(&kvm->arch.config_lock); 1300 1301 /* 1302 * Ignore writes to RES0 bits, read only bits that are cleared on 1303 * vCPU reset, and writable bits that KVM doesn't support yet. 1304 * (i.e. only PMCR.N and bits [7:0] are mutable from userspace) 1305 * The LP bit is RES0 when FEAT_PMUv3p5 is not supported on the vCPU. 1306 * But, we leave the bit as it is here, as the vCPU's PMUver might 1307 * be changed later (NOTE: the bit will be cleared on first vCPU run 1308 * if necessary). 1309 */ 1310 val &= ARMV8_PMU_PMCR_MASK; 1311 1312 /* The LC bit is RES1 when AArch32 is not supported */ 1313 if (!kvm_supports_32bit_el0()) 1314 val |= ARMV8_PMU_PMCR_LC; 1315 1316 __vcpu_sys_reg(vcpu, r->reg) = val; 1317 return 0; 1318 } 1319 1320 /* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go */ 1321 #define DBG_BCR_BVR_WCR_WVR_EL1(n) \ 1322 { SYS_DESC(SYS_DBGBVRn_EL1(n)), \ 1323 trap_bvr, reset_bvr, 0, 0, get_bvr, set_bvr }, \ 1324 { SYS_DESC(SYS_DBGBCRn_EL1(n)), \ 1325 trap_bcr, reset_bcr, 0, 0, get_bcr, set_bcr }, \ 1326 { SYS_DESC(SYS_DBGWVRn_EL1(n)), \ 1327 trap_wvr, reset_wvr, 0, 0, get_wvr, set_wvr }, \ 1328 { SYS_DESC(SYS_DBGWCRn_EL1(n)), \ 1329 trap_wcr, reset_wcr, 0, 0, get_wcr, set_wcr } 1330 1331 #define PMU_SYS_REG(name) \ 1332 SYS_DESC(SYS_##name), .reset = reset_pmu_reg, \ 1333 .visibility = pmu_visibility 1334 1335 /* Macro to expand the PMEVCNTRn_EL0 register */ 1336 #define PMU_PMEVCNTR_EL0(n) \ 1337 { PMU_SYS_REG(PMEVCNTRn_EL0(n)), \ 1338 .reset = reset_pmevcntr, .get_user = get_pmu_evcntr, \ 1339 .access = access_pmu_evcntr, .reg = (PMEVCNTR0_EL0 + n), } 1340 1341 /* Macro to expand the PMEVTYPERn_EL0 register */ 1342 #define PMU_PMEVTYPER_EL0(n) \ 1343 { PMU_SYS_REG(PMEVTYPERn_EL0(n)), \ 1344 .reset = reset_pmevtyper, \ 1345 .access = access_pmu_evtyper, .reg = (PMEVTYPER0_EL0 + n), } 1346 1347 static bool undef_access(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1348 const struct sys_reg_desc *r) 1349 { 1350 kvm_inject_undefined(vcpu); 1351 1352 return false; 1353 } 1354 1355 /* Macro to expand the AMU counter and type registers*/ 1356 #define AMU_AMEVCNTR0_EL0(n) { SYS_DESC(SYS_AMEVCNTR0_EL0(n)), undef_access } 1357 #define AMU_AMEVTYPER0_EL0(n) { SYS_DESC(SYS_AMEVTYPER0_EL0(n)), undef_access } 1358 #define AMU_AMEVCNTR1_EL0(n) { SYS_DESC(SYS_AMEVCNTR1_EL0(n)), undef_access } 1359 #define AMU_AMEVTYPER1_EL0(n) { SYS_DESC(SYS_AMEVTYPER1_EL0(n)), undef_access } 1360 1361 static unsigned int ptrauth_visibility(const struct kvm_vcpu *vcpu, 1362 const struct sys_reg_desc *rd) 1363 { 1364 return vcpu_has_ptrauth(vcpu) ? 0 : REG_HIDDEN; 1365 } 1366 1367 /* 1368 * If we land here on a PtrAuth access, that is because we didn't 1369 * fixup the access on exit by allowing the PtrAuth sysregs. The only 1370 * way this happens is when the guest does not have PtrAuth support 1371 * enabled. 1372 */ 1373 #define __PTRAUTH_KEY(k) \ 1374 { SYS_DESC(SYS_## k), undef_access, reset_unknown, k, \ 1375 .visibility = ptrauth_visibility} 1376 1377 #define PTRAUTH_KEY(k) \ 1378 __PTRAUTH_KEY(k ## KEYLO_EL1), \ 1379 __PTRAUTH_KEY(k ## KEYHI_EL1) 1380 1381 static bool access_arch_timer(struct kvm_vcpu *vcpu, 1382 struct sys_reg_params *p, 1383 const struct sys_reg_desc *r) 1384 { 1385 enum kvm_arch_timers tmr; 1386 enum kvm_arch_timer_regs treg; 1387 u64 reg = reg_to_encoding(r); 1388 1389 switch (reg) { 1390 case SYS_CNTP_TVAL_EL0: 1391 case SYS_AARCH32_CNTP_TVAL: 1392 tmr = TIMER_PTIMER; 1393 treg = TIMER_REG_TVAL; 1394 break; 1395 case SYS_CNTP_CTL_EL0: 1396 case SYS_AARCH32_CNTP_CTL: 1397 tmr = TIMER_PTIMER; 1398 treg = TIMER_REG_CTL; 1399 break; 1400 case SYS_CNTP_CVAL_EL0: 1401 case SYS_AARCH32_CNTP_CVAL: 1402 tmr = TIMER_PTIMER; 1403 treg = TIMER_REG_CVAL; 1404 break; 1405 case SYS_CNTPCT_EL0: 1406 case SYS_CNTPCTSS_EL0: 1407 case SYS_AARCH32_CNTPCT: 1408 tmr = TIMER_PTIMER; 1409 treg = TIMER_REG_CNT; 1410 break; 1411 default: 1412 print_sys_reg_msg(p, "%s", "Unhandled trapped timer register"); 1413 kvm_inject_undefined(vcpu); 1414 return false; 1415 } 1416 1417 if (p->is_write) 1418 kvm_arm_timer_write_sysreg(vcpu, tmr, treg, p->regval); 1419 else 1420 p->regval = kvm_arm_timer_read_sysreg(vcpu, tmr, treg); 1421 1422 return true; 1423 } 1424 1425 static s64 kvm_arm64_ftr_safe_value(u32 id, const struct arm64_ftr_bits *ftrp, 1426 s64 new, s64 cur) 1427 { 1428 struct arm64_ftr_bits kvm_ftr = *ftrp; 1429 1430 /* Some features have different safe value type in KVM than host features */ 1431 switch (id) { 1432 case SYS_ID_AA64DFR0_EL1: 1433 switch (kvm_ftr.shift) { 1434 case ID_AA64DFR0_EL1_PMUVer_SHIFT: 1435 kvm_ftr.type = FTR_LOWER_SAFE; 1436 break; 1437 case ID_AA64DFR0_EL1_DebugVer_SHIFT: 1438 kvm_ftr.type = FTR_LOWER_SAFE; 1439 break; 1440 } 1441 break; 1442 case SYS_ID_DFR0_EL1: 1443 if (kvm_ftr.shift == ID_DFR0_EL1_PerfMon_SHIFT) 1444 kvm_ftr.type = FTR_LOWER_SAFE; 1445 break; 1446 } 1447 1448 return arm64_ftr_safe_value(&kvm_ftr, new, cur); 1449 } 1450 1451 /* 1452 * arm64_check_features() - Check if a feature register value constitutes 1453 * a subset of features indicated by the idreg's KVM sanitised limit. 1454 * 1455 * This function will check if each feature field of @val is the "safe" value 1456 * against idreg's KVM sanitised limit return from reset() callback. 1457 * If a field value in @val is the same as the one in limit, it is always 1458 * considered the safe value regardless For register fields that are not in 1459 * writable, only the value in limit is considered the safe value. 1460 * 1461 * Return: 0 if all the fields are safe. Otherwise, return negative errno. 1462 */ 1463 static int arm64_check_features(struct kvm_vcpu *vcpu, 1464 const struct sys_reg_desc *rd, 1465 u64 val) 1466 { 1467 const struct arm64_ftr_reg *ftr_reg; 1468 const struct arm64_ftr_bits *ftrp = NULL; 1469 u32 id = reg_to_encoding(rd); 1470 u64 writable_mask = rd->val; 1471 u64 limit = rd->reset(vcpu, rd); 1472 u64 mask = 0; 1473 1474 /* 1475 * Hidden and unallocated ID registers may not have a corresponding 1476 * struct arm64_ftr_reg. Of course, if the register is RAZ we know the 1477 * only safe value is 0. 1478 */ 1479 if (sysreg_visible_as_raz(vcpu, rd)) 1480 return val ? -E2BIG : 0; 1481 1482 ftr_reg = get_arm64_ftr_reg(id); 1483 if (!ftr_reg) 1484 return -EINVAL; 1485 1486 ftrp = ftr_reg->ftr_bits; 1487 1488 for (; ftrp && ftrp->width; ftrp++) { 1489 s64 f_val, f_lim, safe_val; 1490 u64 ftr_mask; 1491 1492 ftr_mask = arm64_ftr_mask(ftrp); 1493 if ((ftr_mask & writable_mask) != ftr_mask) 1494 continue; 1495 1496 f_val = arm64_ftr_value(ftrp, val); 1497 f_lim = arm64_ftr_value(ftrp, limit); 1498 mask |= ftr_mask; 1499 1500 if (f_val == f_lim) 1501 safe_val = f_val; 1502 else 1503 safe_val = kvm_arm64_ftr_safe_value(id, ftrp, f_val, f_lim); 1504 1505 if (safe_val != f_val) 1506 return -E2BIG; 1507 } 1508 1509 /* For fields that are not writable, values in limit are the safe values. */ 1510 if ((val & ~mask) != (limit & ~mask)) 1511 return -E2BIG; 1512 1513 return 0; 1514 } 1515 1516 static u8 pmuver_to_perfmon(u8 pmuver) 1517 { 1518 switch (pmuver) { 1519 case ID_AA64DFR0_EL1_PMUVer_IMP: 1520 return ID_DFR0_EL1_PerfMon_PMUv3; 1521 case ID_AA64DFR0_EL1_PMUVer_IMP_DEF: 1522 return ID_DFR0_EL1_PerfMon_IMPDEF; 1523 default: 1524 /* Anything ARMv8.1+ and NI have the same value. For now. */ 1525 return pmuver; 1526 } 1527 } 1528 1529 /* Read a sanitised cpufeature ID register by sys_reg_desc */ 1530 static u64 __kvm_read_sanitised_id_reg(const struct kvm_vcpu *vcpu, 1531 const struct sys_reg_desc *r) 1532 { 1533 u32 id = reg_to_encoding(r); 1534 u64 val; 1535 1536 if (sysreg_visible_as_raz(vcpu, r)) 1537 return 0; 1538 1539 val = read_sanitised_ftr_reg(id); 1540 1541 switch (id) { 1542 case SYS_ID_AA64PFR1_EL1: 1543 if (!kvm_has_mte(vcpu->kvm)) 1544 val &= ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_MTE); 1545 1546 val &= ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_SME); 1547 break; 1548 case SYS_ID_AA64PFR2_EL1: 1549 /* We only expose FPMR */ 1550 val &= ID_AA64PFR2_EL1_FPMR; 1551 break; 1552 case SYS_ID_AA64ISAR1_EL1: 1553 if (!vcpu_has_ptrauth(vcpu)) 1554 val &= ~(ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_APA) | 1555 ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_API) | 1556 ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_GPA) | 1557 ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_GPI)); 1558 break; 1559 case SYS_ID_AA64ISAR2_EL1: 1560 if (!vcpu_has_ptrauth(vcpu)) 1561 val &= ~(ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_APA3) | 1562 ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_GPA3)); 1563 if (!cpus_have_final_cap(ARM64_HAS_WFXT)) 1564 val &= ~ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_WFxT); 1565 break; 1566 case SYS_ID_AA64MMFR2_EL1: 1567 val &= ~ID_AA64MMFR2_EL1_CCIDX_MASK; 1568 break; 1569 case SYS_ID_MMFR4_EL1: 1570 val &= ~ARM64_FEATURE_MASK(ID_MMFR4_EL1_CCIDX); 1571 break; 1572 } 1573 1574 return val; 1575 } 1576 1577 static u64 kvm_read_sanitised_id_reg(struct kvm_vcpu *vcpu, 1578 const struct sys_reg_desc *r) 1579 { 1580 return __kvm_read_sanitised_id_reg(vcpu, r); 1581 } 1582 1583 static u64 read_id_reg(const struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 1584 { 1585 return kvm_read_vm_id_reg(vcpu->kvm, reg_to_encoding(r)); 1586 } 1587 1588 static bool is_feature_id_reg(u32 encoding) 1589 { 1590 return (sys_reg_Op0(encoding) == 3 && 1591 (sys_reg_Op1(encoding) < 2 || sys_reg_Op1(encoding) == 3) && 1592 sys_reg_CRn(encoding) == 0 && 1593 sys_reg_CRm(encoding) <= 7); 1594 } 1595 1596 /* 1597 * Return true if the register's (Op0, Op1, CRn, CRm, Op2) is 1598 * (3, 0, 0, crm, op2), where 1<=crm<8, 0<=op2<8, which is the range of ID 1599 * registers KVM maintains on a per-VM basis. 1600 */ 1601 static inline bool is_vm_ftr_id_reg(u32 id) 1602 { 1603 if (id == SYS_CTR_EL0) 1604 return true; 1605 1606 return (sys_reg_Op0(id) == 3 && sys_reg_Op1(id) == 0 && 1607 sys_reg_CRn(id) == 0 && sys_reg_CRm(id) >= 1 && 1608 sys_reg_CRm(id) < 8); 1609 } 1610 1611 static inline bool is_vcpu_ftr_id_reg(u32 id) 1612 { 1613 return is_feature_id_reg(id) && !is_vm_ftr_id_reg(id); 1614 } 1615 1616 static inline bool is_aa32_id_reg(u32 id) 1617 { 1618 return (sys_reg_Op0(id) == 3 && sys_reg_Op1(id) == 0 && 1619 sys_reg_CRn(id) == 0 && sys_reg_CRm(id) >= 1 && 1620 sys_reg_CRm(id) <= 3); 1621 } 1622 1623 static unsigned int id_visibility(const struct kvm_vcpu *vcpu, 1624 const struct sys_reg_desc *r) 1625 { 1626 u32 id = reg_to_encoding(r); 1627 1628 switch (id) { 1629 case SYS_ID_AA64ZFR0_EL1: 1630 if (!vcpu_has_sve(vcpu)) 1631 return REG_RAZ; 1632 break; 1633 } 1634 1635 return 0; 1636 } 1637 1638 static unsigned int aa32_id_visibility(const struct kvm_vcpu *vcpu, 1639 const struct sys_reg_desc *r) 1640 { 1641 /* 1642 * AArch32 ID registers are UNKNOWN if AArch32 isn't implemented at any 1643 * EL. Promote to RAZ/WI in order to guarantee consistency between 1644 * systems. 1645 */ 1646 if (!kvm_supports_32bit_el0()) 1647 return REG_RAZ | REG_USER_WI; 1648 1649 return id_visibility(vcpu, r); 1650 } 1651 1652 static unsigned int raz_visibility(const struct kvm_vcpu *vcpu, 1653 const struct sys_reg_desc *r) 1654 { 1655 return REG_RAZ; 1656 } 1657 1658 /* cpufeature ID register access trap handlers */ 1659 1660 static bool access_id_reg(struct kvm_vcpu *vcpu, 1661 struct sys_reg_params *p, 1662 const struct sys_reg_desc *r) 1663 { 1664 if (p->is_write) 1665 return write_to_read_only(vcpu, p, r); 1666 1667 p->regval = read_id_reg(vcpu, r); 1668 1669 return true; 1670 } 1671 1672 /* Visibility overrides for SVE-specific control registers */ 1673 static unsigned int sve_visibility(const struct kvm_vcpu *vcpu, 1674 const struct sys_reg_desc *rd) 1675 { 1676 if (vcpu_has_sve(vcpu)) 1677 return 0; 1678 1679 return REG_HIDDEN; 1680 } 1681 1682 static unsigned int sme_visibility(const struct kvm_vcpu *vcpu, 1683 const struct sys_reg_desc *rd) 1684 { 1685 if (kvm_has_feat(vcpu->kvm, ID_AA64PFR1_EL1, SME, IMP)) 1686 return 0; 1687 1688 return REG_HIDDEN; 1689 } 1690 1691 static unsigned int fp8_visibility(const struct kvm_vcpu *vcpu, 1692 const struct sys_reg_desc *rd) 1693 { 1694 if (kvm_has_fpmr(vcpu->kvm)) 1695 return 0; 1696 1697 return REG_HIDDEN; 1698 } 1699 1700 static u64 read_sanitised_id_aa64pfr0_el1(struct kvm_vcpu *vcpu, 1701 const struct sys_reg_desc *rd) 1702 { 1703 u64 val = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1); 1704 1705 if (!vcpu_has_sve(vcpu)) 1706 val &= ~ID_AA64PFR0_EL1_SVE_MASK; 1707 1708 /* 1709 * The default is to expose CSV2 == 1 if the HW isn't affected. 1710 * Although this is a per-CPU feature, we make it global because 1711 * asymmetric systems are just a nuisance. 1712 * 1713 * Userspace can override this as long as it doesn't promise 1714 * the impossible. 1715 */ 1716 if (arm64_get_spectre_v2_state() == SPECTRE_UNAFFECTED) { 1717 val &= ~ID_AA64PFR0_EL1_CSV2_MASK; 1718 val |= SYS_FIELD_PREP_ENUM(ID_AA64PFR0_EL1, CSV2, IMP); 1719 } 1720 if (arm64_get_meltdown_state() == SPECTRE_UNAFFECTED) { 1721 val &= ~ID_AA64PFR0_EL1_CSV3_MASK; 1722 val |= SYS_FIELD_PREP_ENUM(ID_AA64PFR0_EL1, CSV3, IMP); 1723 } 1724 1725 if (kvm_vgic_global_state.type == VGIC_V3) { 1726 val &= ~ID_AA64PFR0_EL1_GIC_MASK; 1727 val |= SYS_FIELD_PREP_ENUM(ID_AA64PFR0_EL1, GIC, IMP); 1728 } 1729 1730 val &= ~ID_AA64PFR0_EL1_AMU_MASK; 1731 1732 return val; 1733 } 1734 1735 #define ID_REG_LIMIT_FIELD_ENUM(val, reg, field, limit) \ 1736 ({ \ 1737 u64 __f_val = FIELD_GET(reg##_##field##_MASK, val); \ 1738 (val) &= ~reg##_##field##_MASK; \ 1739 (val) |= FIELD_PREP(reg##_##field##_MASK, \ 1740 min(__f_val, \ 1741 (u64)SYS_FIELD_VALUE(reg, field, limit))); \ 1742 (val); \ 1743 }) 1744 1745 static u64 read_sanitised_id_aa64dfr0_el1(struct kvm_vcpu *vcpu, 1746 const struct sys_reg_desc *rd) 1747 { 1748 u64 val = read_sanitised_ftr_reg(SYS_ID_AA64DFR0_EL1); 1749 1750 val = ID_REG_LIMIT_FIELD_ENUM(val, ID_AA64DFR0_EL1, DebugVer, V8P8); 1751 1752 /* 1753 * Only initialize the PMU version if the vCPU was configured with one. 1754 */ 1755 val &= ~ID_AA64DFR0_EL1_PMUVer_MASK; 1756 if (kvm_vcpu_has_pmu(vcpu)) 1757 val |= SYS_FIELD_PREP(ID_AA64DFR0_EL1, PMUVer, 1758 kvm_arm_pmu_get_pmuver_limit()); 1759 1760 /* Hide SPE from guests */ 1761 val &= ~ID_AA64DFR0_EL1_PMSVer_MASK; 1762 1763 return val; 1764 } 1765 1766 static int set_id_aa64dfr0_el1(struct kvm_vcpu *vcpu, 1767 const struct sys_reg_desc *rd, 1768 u64 val) 1769 { 1770 u8 debugver = SYS_FIELD_GET(ID_AA64DFR0_EL1, DebugVer, val); 1771 u8 pmuver = SYS_FIELD_GET(ID_AA64DFR0_EL1, PMUVer, val); 1772 1773 /* 1774 * Prior to commit 3d0dba5764b9 ("KVM: arm64: PMU: Move the 1775 * ID_AA64DFR0_EL1.PMUver limit to VM creation"), KVM erroneously 1776 * exposed an IMP_DEF PMU to userspace and the guest on systems w/ 1777 * non-architectural PMUs. Of course, PMUv3 is the only game in town for 1778 * PMU virtualization, so the IMP_DEF value was rather user-hostile. 1779 * 1780 * At minimum, we're on the hook to allow values that were given to 1781 * userspace by KVM. Cover our tracks here and replace the IMP_DEF value 1782 * with a more sensible NI. The value of an ID register changing under 1783 * the nose of the guest is unfortunate, but is certainly no more 1784 * surprising than an ill-guided PMU driver poking at impdef system 1785 * registers that end in an UNDEF... 1786 */ 1787 if (pmuver == ID_AA64DFR0_EL1_PMUVer_IMP_DEF) 1788 val &= ~ID_AA64DFR0_EL1_PMUVer_MASK; 1789 1790 /* 1791 * ID_AA64DFR0_EL1.DebugVer is one of those awkward fields with a 1792 * nonzero minimum safe value. 1793 */ 1794 if (debugver < ID_AA64DFR0_EL1_DebugVer_IMP) 1795 return -EINVAL; 1796 1797 return set_id_reg(vcpu, rd, val); 1798 } 1799 1800 static u64 read_sanitised_id_dfr0_el1(struct kvm_vcpu *vcpu, 1801 const struct sys_reg_desc *rd) 1802 { 1803 u8 perfmon = pmuver_to_perfmon(kvm_arm_pmu_get_pmuver_limit()); 1804 u64 val = read_sanitised_ftr_reg(SYS_ID_DFR0_EL1); 1805 1806 val &= ~ID_DFR0_EL1_PerfMon_MASK; 1807 if (kvm_vcpu_has_pmu(vcpu)) 1808 val |= SYS_FIELD_PREP(ID_DFR0_EL1, PerfMon, perfmon); 1809 1810 val = ID_REG_LIMIT_FIELD_ENUM(val, ID_DFR0_EL1, CopDbg, Debugv8p8); 1811 1812 return val; 1813 } 1814 1815 static int set_id_dfr0_el1(struct kvm_vcpu *vcpu, 1816 const struct sys_reg_desc *rd, 1817 u64 val) 1818 { 1819 u8 perfmon = SYS_FIELD_GET(ID_DFR0_EL1, PerfMon, val); 1820 u8 copdbg = SYS_FIELD_GET(ID_DFR0_EL1, CopDbg, val); 1821 1822 if (perfmon == ID_DFR0_EL1_PerfMon_IMPDEF) { 1823 val &= ~ID_DFR0_EL1_PerfMon_MASK; 1824 perfmon = 0; 1825 } 1826 1827 /* 1828 * Allow DFR0_EL1.PerfMon to be set from userspace as long as 1829 * it doesn't promise more than what the HW gives us on the 1830 * AArch64 side (as everything is emulated with that), and 1831 * that this is a PMUv3. 1832 */ 1833 if (perfmon != 0 && perfmon < ID_DFR0_EL1_PerfMon_PMUv3) 1834 return -EINVAL; 1835 1836 if (copdbg < ID_DFR0_EL1_CopDbg_Armv8) 1837 return -EINVAL; 1838 1839 return set_id_reg(vcpu, rd, val); 1840 } 1841 1842 /* 1843 * cpufeature ID register user accessors 1844 * 1845 * For now, these registers are immutable for userspace, so no values 1846 * are stored, and for set_id_reg() we don't allow the effective value 1847 * to be changed. 1848 */ 1849 static int get_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 1850 u64 *val) 1851 { 1852 /* 1853 * Avoid locking if the VM has already started, as the ID registers are 1854 * guaranteed to be invariant at that point. 1855 */ 1856 if (kvm_vm_has_ran_once(vcpu->kvm)) { 1857 *val = read_id_reg(vcpu, rd); 1858 return 0; 1859 } 1860 1861 mutex_lock(&vcpu->kvm->arch.config_lock); 1862 *val = read_id_reg(vcpu, rd); 1863 mutex_unlock(&vcpu->kvm->arch.config_lock); 1864 1865 return 0; 1866 } 1867 1868 static int set_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 1869 u64 val) 1870 { 1871 u32 id = reg_to_encoding(rd); 1872 int ret; 1873 1874 mutex_lock(&vcpu->kvm->arch.config_lock); 1875 1876 /* 1877 * Once the VM has started the ID registers are immutable. Reject any 1878 * write that does not match the final register value. 1879 */ 1880 if (kvm_vm_has_ran_once(vcpu->kvm)) { 1881 if (val != read_id_reg(vcpu, rd)) 1882 ret = -EBUSY; 1883 else 1884 ret = 0; 1885 1886 mutex_unlock(&vcpu->kvm->arch.config_lock); 1887 return ret; 1888 } 1889 1890 ret = arm64_check_features(vcpu, rd, val); 1891 if (!ret) 1892 kvm_set_vm_id_reg(vcpu->kvm, id, val); 1893 1894 mutex_unlock(&vcpu->kvm->arch.config_lock); 1895 1896 /* 1897 * arm64_check_features() returns -E2BIG to indicate the register's 1898 * feature set is a superset of the maximally-allowed register value. 1899 * While it would be nice to precisely describe this to userspace, the 1900 * existing UAPI for KVM_SET_ONE_REG has it that invalid register 1901 * writes return -EINVAL. 1902 */ 1903 if (ret == -E2BIG) 1904 ret = -EINVAL; 1905 return ret; 1906 } 1907 1908 void kvm_set_vm_id_reg(struct kvm *kvm, u32 reg, u64 val) 1909 { 1910 u64 *p = __vm_id_reg(&kvm->arch, reg); 1911 1912 lockdep_assert_held(&kvm->arch.config_lock); 1913 1914 if (KVM_BUG_ON(kvm_vm_has_ran_once(kvm) || !p, kvm)) 1915 return; 1916 1917 *p = val; 1918 } 1919 1920 static int get_raz_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 1921 u64 *val) 1922 { 1923 *val = 0; 1924 return 0; 1925 } 1926 1927 static int set_wi_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 1928 u64 val) 1929 { 1930 return 0; 1931 } 1932 1933 static bool access_ctr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1934 const struct sys_reg_desc *r) 1935 { 1936 if (p->is_write) 1937 return write_to_read_only(vcpu, p, r); 1938 1939 p->regval = kvm_read_vm_id_reg(vcpu->kvm, SYS_CTR_EL0); 1940 return true; 1941 } 1942 1943 static bool access_clidr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1944 const struct sys_reg_desc *r) 1945 { 1946 if (p->is_write) 1947 return write_to_read_only(vcpu, p, r); 1948 1949 p->regval = __vcpu_sys_reg(vcpu, r->reg); 1950 return true; 1951 } 1952 1953 /* 1954 * Fabricate a CLIDR_EL1 value instead of using the real value, which can vary 1955 * by the physical CPU which the vcpu currently resides in. 1956 */ 1957 static u64 reset_clidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 1958 { 1959 u64 ctr_el0 = read_sanitised_ftr_reg(SYS_CTR_EL0); 1960 u64 clidr; 1961 u8 loc; 1962 1963 if ((ctr_el0 & CTR_EL0_IDC)) { 1964 /* 1965 * Data cache clean to the PoU is not required so LoUU and LoUIS 1966 * will not be set and a unified cache, which will be marked as 1967 * LoC, will be added. 1968 * 1969 * If not DIC, let the unified cache L2 so that an instruction 1970 * cache can be added as L1 later. 1971 */ 1972 loc = (ctr_el0 & CTR_EL0_DIC) ? 1 : 2; 1973 clidr = CACHE_TYPE_UNIFIED << CLIDR_CTYPE_SHIFT(loc); 1974 } else { 1975 /* 1976 * Data cache clean to the PoU is required so let L1 have a data 1977 * cache and mark it as LoUU and LoUIS. As L1 has a data cache, 1978 * it can be marked as LoC too. 1979 */ 1980 loc = 1; 1981 clidr = 1 << CLIDR_LOUU_SHIFT; 1982 clidr |= 1 << CLIDR_LOUIS_SHIFT; 1983 clidr |= CACHE_TYPE_DATA << CLIDR_CTYPE_SHIFT(1); 1984 } 1985 1986 /* 1987 * Instruction cache invalidation to the PoU is required so let L1 have 1988 * an instruction cache. If L1 already has a data cache, it will be 1989 * CACHE_TYPE_SEPARATE. 1990 */ 1991 if (!(ctr_el0 & CTR_EL0_DIC)) 1992 clidr |= CACHE_TYPE_INST << CLIDR_CTYPE_SHIFT(1); 1993 1994 clidr |= loc << CLIDR_LOC_SHIFT; 1995 1996 /* 1997 * Add tag cache unified to data cache. Allocation tags and data are 1998 * unified in a cache line so that it looks valid even if there is only 1999 * one cache line. 2000 */ 2001 if (kvm_has_mte(vcpu->kvm)) 2002 clidr |= 2 << CLIDR_TTYPE_SHIFT(loc); 2003 2004 __vcpu_sys_reg(vcpu, r->reg) = clidr; 2005 2006 return __vcpu_sys_reg(vcpu, r->reg); 2007 } 2008 2009 static int set_clidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 2010 u64 val) 2011 { 2012 u64 ctr_el0 = read_sanitised_ftr_reg(SYS_CTR_EL0); 2013 u64 idc = !CLIDR_LOC(val) || (!CLIDR_LOUIS(val) && !CLIDR_LOUU(val)); 2014 2015 if ((val & CLIDR_EL1_RES0) || (!(ctr_el0 & CTR_EL0_IDC) && idc)) 2016 return -EINVAL; 2017 2018 __vcpu_sys_reg(vcpu, rd->reg) = val; 2019 2020 return 0; 2021 } 2022 2023 static bool access_csselr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 2024 const struct sys_reg_desc *r) 2025 { 2026 int reg = r->reg; 2027 2028 if (p->is_write) 2029 vcpu_write_sys_reg(vcpu, p->regval, reg); 2030 else 2031 p->regval = vcpu_read_sys_reg(vcpu, reg); 2032 return true; 2033 } 2034 2035 static bool access_ccsidr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 2036 const struct sys_reg_desc *r) 2037 { 2038 u32 csselr; 2039 2040 if (p->is_write) 2041 return write_to_read_only(vcpu, p, r); 2042 2043 csselr = vcpu_read_sys_reg(vcpu, CSSELR_EL1); 2044 csselr &= CSSELR_EL1_Level | CSSELR_EL1_InD; 2045 if (csselr < CSSELR_MAX) 2046 p->regval = get_ccsidr(vcpu, csselr); 2047 2048 return true; 2049 } 2050 2051 static unsigned int mte_visibility(const struct kvm_vcpu *vcpu, 2052 const struct sys_reg_desc *rd) 2053 { 2054 if (kvm_has_mte(vcpu->kvm)) 2055 return 0; 2056 2057 return REG_HIDDEN; 2058 } 2059 2060 #define MTE_REG(name) { \ 2061 SYS_DESC(SYS_##name), \ 2062 .access = undef_access, \ 2063 .reset = reset_unknown, \ 2064 .reg = name, \ 2065 .visibility = mte_visibility, \ 2066 } 2067 2068 static unsigned int el2_visibility(const struct kvm_vcpu *vcpu, 2069 const struct sys_reg_desc *rd) 2070 { 2071 if (vcpu_has_nv(vcpu)) 2072 return 0; 2073 2074 return REG_HIDDEN; 2075 } 2076 2077 static bool bad_vncr_trap(struct kvm_vcpu *vcpu, 2078 struct sys_reg_params *p, 2079 const struct sys_reg_desc *r) 2080 { 2081 /* 2082 * We really shouldn't be here, and this is likely the result 2083 * of a misconfigured trap, as this register should target the 2084 * VNCR page, and nothing else. 2085 */ 2086 return bad_trap(vcpu, p, r, 2087 "trap of VNCR-backed register"); 2088 } 2089 2090 static bool bad_redir_trap(struct kvm_vcpu *vcpu, 2091 struct sys_reg_params *p, 2092 const struct sys_reg_desc *r) 2093 { 2094 /* 2095 * We really shouldn't be here, and this is likely the result 2096 * of a misconfigured trap, as this register should target the 2097 * corresponding EL1, and nothing else. 2098 */ 2099 return bad_trap(vcpu, p, r, 2100 "trap of EL2 register redirected to EL1"); 2101 } 2102 2103 #define EL2_REG(name, acc, rst, v) { \ 2104 SYS_DESC(SYS_##name), \ 2105 .access = acc, \ 2106 .reset = rst, \ 2107 .reg = name, \ 2108 .visibility = el2_visibility, \ 2109 .val = v, \ 2110 } 2111 2112 #define EL2_REG_VNCR(name, rst, v) EL2_REG(name, bad_vncr_trap, rst, v) 2113 #define EL2_REG_REDIR(name, rst, v) EL2_REG(name, bad_redir_trap, rst, v) 2114 2115 /* 2116 * EL{0,1}2 registers are the EL2 view on an EL0 or EL1 register when 2117 * HCR_EL2.E2H==1, and only in the sysreg table for convenience of 2118 * handling traps. Given that, they are always hidden from userspace. 2119 */ 2120 static unsigned int hidden_user_visibility(const struct kvm_vcpu *vcpu, 2121 const struct sys_reg_desc *rd) 2122 { 2123 return REG_HIDDEN_USER; 2124 } 2125 2126 #define EL12_REG(name, acc, rst, v) { \ 2127 SYS_DESC(SYS_##name##_EL12), \ 2128 .access = acc, \ 2129 .reset = rst, \ 2130 .reg = name##_EL1, \ 2131 .val = v, \ 2132 .visibility = hidden_user_visibility, \ 2133 } 2134 2135 /* 2136 * Since reset() callback and field val are not used for idregs, they will be 2137 * used for specific purposes for idregs. 2138 * The reset() would return KVM sanitised register value. The value would be the 2139 * same as the host kernel sanitised value if there is no KVM sanitisation. 2140 * The val would be used as a mask indicating writable fields for the idreg. 2141 * Only bits with 1 are writable from userspace. This mask might not be 2142 * necessary in the future whenever all ID registers are enabled as writable 2143 * from userspace. 2144 */ 2145 2146 #define ID_DESC(name) \ 2147 SYS_DESC(SYS_##name), \ 2148 .access = access_id_reg, \ 2149 .get_user = get_id_reg \ 2150 2151 /* sys_reg_desc initialiser for known cpufeature ID registers */ 2152 #define ID_SANITISED(name) { \ 2153 ID_DESC(name), \ 2154 .set_user = set_id_reg, \ 2155 .visibility = id_visibility, \ 2156 .reset = kvm_read_sanitised_id_reg, \ 2157 .val = 0, \ 2158 } 2159 2160 /* sys_reg_desc initialiser for known cpufeature ID registers */ 2161 #define AA32_ID_SANITISED(name) { \ 2162 ID_DESC(name), \ 2163 .set_user = set_id_reg, \ 2164 .visibility = aa32_id_visibility, \ 2165 .reset = kvm_read_sanitised_id_reg, \ 2166 .val = 0, \ 2167 } 2168 2169 /* sys_reg_desc initialiser for writable ID registers */ 2170 #define ID_WRITABLE(name, mask) { \ 2171 ID_DESC(name), \ 2172 .set_user = set_id_reg, \ 2173 .visibility = id_visibility, \ 2174 .reset = kvm_read_sanitised_id_reg, \ 2175 .val = mask, \ 2176 } 2177 2178 /* 2179 * sys_reg_desc initialiser for architecturally unallocated cpufeature ID 2180 * register with encoding Op0=3, Op1=0, CRn=0, CRm=crm, Op2=op2 2181 * (1 <= crm < 8, 0 <= Op2 < 8). 2182 */ 2183 #define ID_UNALLOCATED(crm, op2) { \ 2184 Op0(3), Op1(0), CRn(0), CRm(crm), Op2(op2), \ 2185 .access = access_id_reg, \ 2186 .get_user = get_id_reg, \ 2187 .set_user = set_id_reg, \ 2188 .visibility = raz_visibility, \ 2189 .reset = kvm_read_sanitised_id_reg, \ 2190 .val = 0, \ 2191 } 2192 2193 /* 2194 * sys_reg_desc initialiser for known ID registers that we hide from guests. 2195 * For now, these are exposed just like unallocated ID regs: they appear 2196 * RAZ for the guest. 2197 */ 2198 #define ID_HIDDEN(name) { \ 2199 ID_DESC(name), \ 2200 .set_user = set_id_reg, \ 2201 .visibility = raz_visibility, \ 2202 .reset = kvm_read_sanitised_id_reg, \ 2203 .val = 0, \ 2204 } 2205 2206 static bool access_sp_el1(struct kvm_vcpu *vcpu, 2207 struct sys_reg_params *p, 2208 const struct sys_reg_desc *r) 2209 { 2210 if (p->is_write) 2211 __vcpu_sys_reg(vcpu, SP_EL1) = p->regval; 2212 else 2213 p->regval = __vcpu_sys_reg(vcpu, SP_EL1); 2214 2215 return true; 2216 } 2217 2218 static bool access_elr(struct kvm_vcpu *vcpu, 2219 struct sys_reg_params *p, 2220 const struct sys_reg_desc *r) 2221 { 2222 if (p->is_write) 2223 vcpu_write_sys_reg(vcpu, p->regval, ELR_EL1); 2224 else 2225 p->regval = vcpu_read_sys_reg(vcpu, ELR_EL1); 2226 2227 return true; 2228 } 2229 2230 static bool access_spsr(struct kvm_vcpu *vcpu, 2231 struct sys_reg_params *p, 2232 const struct sys_reg_desc *r) 2233 { 2234 if (p->is_write) 2235 __vcpu_sys_reg(vcpu, SPSR_EL1) = p->regval; 2236 else 2237 p->regval = __vcpu_sys_reg(vcpu, SPSR_EL1); 2238 2239 return true; 2240 } 2241 2242 static u64 reset_hcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 2243 { 2244 u64 val = r->val; 2245 2246 if (!cpus_have_final_cap(ARM64_HAS_HCR_NV1)) 2247 val |= HCR_E2H; 2248 2249 return __vcpu_sys_reg(vcpu, r->reg) = val; 2250 } 2251 2252 static unsigned int sve_el2_visibility(const struct kvm_vcpu *vcpu, 2253 const struct sys_reg_desc *rd) 2254 { 2255 unsigned int r; 2256 2257 r = el2_visibility(vcpu, rd); 2258 if (r) 2259 return r; 2260 2261 return sve_visibility(vcpu, rd); 2262 } 2263 2264 static bool access_zcr_el2(struct kvm_vcpu *vcpu, 2265 struct sys_reg_params *p, 2266 const struct sys_reg_desc *r) 2267 { 2268 unsigned int vq; 2269 2270 if (guest_hyp_sve_traps_enabled(vcpu)) { 2271 kvm_inject_nested_sve_trap(vcpu); 2272 return true; 2273 } 2274 2275 if (!p->is_write) { 2276 p->regval = vcpu_read_sys_reg(vcpu, ZCR_EL2); 2277 return true; 2278 } 2279 2280 vq = SYS_FIELD_GET(ZCR_ELx, LEN, p->regval) + 1; 2281 vq = min(vq, vcpu_sve_max_vq(vcpu)); 2282 vcpu_write_sys_reg(vcpu, vq - 1, ZCR_EL2); 2283 return true; 2284 } 2285 2286 /* 2287 * Architected system registers. 2288 * Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2 2289 * 2290 * Debug handling: We do trap most, if not all debug related system 2291 * registers. The implementation is good enough to ensure that a guest 2292 * can use these with minimal performance degradation. The drawback is 2293 * that we don't implement any of the external debug architecture. 2294 * This should be revisited if we ever encounter a more demanding 2295 * guest... 2296 */ 2297 static const struct sys_reg_desc sys_reg_descs[] = { 2298 DBG_BCR_BVR_WCR_WVR_EL1(0), 2299 DBG_BCR_BVR_WCR_WVR_EL1(1), 2300 { SYS_DESC(SYS_MDCCINT_EL1), trap_debug_regs, reset_val, MDCCINT_EL1, 0 }, 2301 { SYS_DESC(SYS_MDSCR_EL1), trap_debug_regs, reset_val, MDSCR_EL1, 0 }, 2302 DBG_BCR_BVR_WCR_WVR_EL1(2), 2303 DBG_BCR_BVR_WCR_WVR_EL1(3), 2304 DBG_BCR_BVR_WCR_WVR_EL1(4), 2305 DBG_BCR_BVR_WCR_WVR_EL1(5), 2306 DBG_BCR_BVR_WCR_WVR_EL1(6), 2307 DBG_BCR_BVR_WCR_WVR_EL1(7), 2308 DBG_BCR_BVR_WCR_WVR_EL1(8), 2309 DBG_BCR_BVR_WCR_WVR_EL1(9), 2310 DBG_BCR_BVR_WCR_WVR_EL1(10), 2311 DBG_BCR_BVR_WCR_WVR_EL1(11), 2312 DBG_BCR_BVR_WCR_WVR_EL1(12), 2313 DBG_BCR_BVR_WCR_WVR_EL1(13), 2314 DBG_BCR_BVR_WCR_WVR_EL1(14), 2315 DBG_BCR_BVR_WCR_WVR_EL1(15), 2316 2317 { SYS_DESC(SYS_MDRAR_EL1), trap_raz_wi }, 2318 { SYS_DESC(SYS_OSLAR_EL1), trap_oslar_el1 }, 2319 { SYS_DESC(SYS_OSLSR_EL1), trap_oslsr_el1, reset_val, OSLSR_EL1, 2320 OSLSR_EL1_OSLM_IMPLEMENTED, .set_user = set_oslsr_el1, }, 2321 { SYS_DESC(SYS_OSDLR_EL1), trap_raz_wi }, 2322 { SYS_DESC(SYS_DBGPRCR_EL1), trap_raz_wi }, 2323 { SYS_DESC(SYS_DBGCLAIMSET_EL1), trap_raz_wi }, 2324 { SYS_DESC(SYS_DBGCLAIMCLR_EL1), trap_raz_wi }, 2325 { SYS_DESC(SYS_DBGAUTHSTATUS_EL1), trap_dbgauthstatus_el1 }, 2326 2327 { SYS_DESC(SYS_MDCCSR_EL0), trap_raz_wi }, 2328 { SYS_DESC(SYS_DBGDTR_EL0), trap_raz_wi }, 2329 // DBGDTR[TR]X_EL0 share the same encoding 2330 { SYS_DESC(SYS_DBGDTRTX_EL0), trap_raz_wi }, 2331 2332 { SYS_DESC(SYS_DBGVCR32_EL2), trap_undef, reset_val, DBGVCR32_EL2, 0 }, 2333 2334 { SYS_DESC(SYS_MPIDR_EL1), NULL, reset_mpidr, MPIDR_EL1 }, 2335 2336 /* 2337 * ID regs: all ID_SANITISED() entries here must have corresponding 2338 * entries in arm64_ftr_regs[]. 2339 */ 2340 2341 /* AArch64 mappings of the AArch32 ID registers */ 2342 /* CRm=1 */ 2343 AA32_ID_SANITISED(ID_PFR0_EL1), 2344 AA32_ID_SANITISED(ID_PFR1_EL1), 2345 { SYS_DESC(SYS_ID_DFR0_EL1), 2346 .access = access_id_reg, 2347 .get_user = get_id_reg, 2348 .set_user = set_id_dfr0_el1, 2349 .visibility = aa32_id_visibility, 2350 .reset = read_sanitised_id_dfr0_el1, 2351 .val = ID_DFR0_EL1_PerfMon_MASK | 2352 ID_DFR0_EL1_CopDbg_MASK, }, 2353 ID_HIDDEN(ID_AFR0_EL1), 2354 AA32_ID_SANITISED(ID_MMFR0_EL1), 2355 AA32_ID_SANITISED(ID_MMFR1_EL1), 2356 AA32_ID_SANITISED(ID_MMFR2_EL1), 2357 AA32_ID_SANITISED(ID_MMFR3_EL1), 2358 2359 /* CRm=2 */ 2360 AA32_ID_SANITISED(ID_ISAR0_EL1), 2361 AA32_ID_SANITISED(ID_ISAR1_EL1), 2362 AA32_ID_SANITISED(ID_ISAR2_EL1), 2363 AA32_ID_SANITISED(ID_ISAR3_EL1), 2364 AA32_ID_SANITISED(ID_ISAR4_EL1), 2365 AA32_ID_SANITISED(ID_ISAR5_EL1), 2366 AA32_ID_SANITISED(ID_MMFR4_EL1), 2367 AA32_ID_SANITISED(ID_ISAR6_EL1), 2368 2369 /* CRm=3 */ 2370 AA32_ID_SANITISED(MVFR0_EL1), 2371 AA32_ID_SANITISED(MVFR1_EL1), 2372 AA32_ID_SANITISED(MVFR2_EL1), 2373 ID_UNALLOCATED(3,3), 2374 AA32_ID_SANITISED(ID_PFR2_EL1), 2375 ID_HIDDEN(ID_DFR1_EL1), 2376 AA32_ID_SANITISED(ID_MMFR5_EL1), 2377 ID_UNALLOCATED(3,7), 2378 2379 /* AArch64 ID registers */ 2380 /* CRm=4 */ 2381 { SYS_DESC(SYS_ID_AA64PFR0_EL1), 2382 .access = access_id_reg, 2383 .get_user = get_id_reg, 2384 .set_user = set_id_reg, 2385 .reset = read_sanitised_id_aa64pfr0_el1, 2386 .val = ~(ID_AA64PFR0_EL1_AMU | 2387 ID_AA64PFR0_EL1_MPAM | 2388 ID_AA64PFR0_EL1_SVE | 2389 ID_AA64PFR0_EL1_RAS | 2390 ID_AA64PFR0_EL1_GIC | 2391 ID_AA64PFR0_EL1_AdvSIMD | 2392 ID_AA64PFR0_EL1_FP), }, 2393 ID_SANITISED(ID_AA64PFR1_EL1), 2394 ID_WRITABLE(ID_AA64PFR2_EL1, ID_AA64PFR2_EL1_FPMR), 2395 ID_UNALLOCATED(4,3), 2396 ID_WRITABLE(ID_AA64ZFR0_EL1, ~ID_AA64ZFR0_EL1_RES0), 2397 ID_HIDDEN(ID_AA64SMFR0_EL1), 2398 ID_UNALLOCATED(4,6), 2399 ID_WRITABLE(ID_AA64FPFR0_EL1, ~ID_AA64FPFR0_EL1_RES0), 2400 2401 /* CRm=5 */ 2402 { SYS_DESC(SYS_ID_AA64DFR0_EL1), 2403 .access = access_id_reg, 2404 .get_user = get_id_reg, 2405 .set_user = set_id_aa64dfr0_el1, 2406 .reset = read_sanitised_id_aa64dfr0_el1, 2407 .val = ID_AA64DFR0_EL1_PMUVer_MASK | 2408 ID_AA64DFR0_EL1_DebugVer_MASK, }, 2409 ID_SANITISED(ID_AA64DFR1_EL1), 2410 ID_UNALLOCATED(5,2), 2411 ID_UNALLOCATED(5,3), 2412 ID_HIDDEN(ID_AA64AFR0_EL1), 2413 ID_HIDDEN(ID_AA64AFR1_EL1), 2414 ID_UNALLOCATED(5,6), 2415 ID_UNALLOCATED(5,7), 2416 2417 /* CRm=6 */ 2418 ID_WRITABLE(ID_AA64ISAR0_EL1, ~ID_AA64ISAR0_EL1_RES0), 2419 ID_WRITABLE(ID_AA64ISAR1_EL1, ~(ID_AA64ISAR1_EL1_GPI | 2420 ID_AA64ISAR1_EL1_GPA | 2421 ID_AA64ISAR1_EL1_API | 2422 ID_AA64ISAR1_EL1_APA)), 2423 ID_WRITABLE(ID_AA64ISAR2_EL1, ~(ID_AA64ISAR2_EL1_RES0 | 2424 ID_AA64ISAR2_EL1_APA3 | 2425 ID_AA64ISAR2_EL1_GPA3)), 2426 ID_UNALLOCATED(6,3), 2427 ID_UNALLOCATED(6,4), 2428 ID_UNALLOCATED(6,5), 2429 ID_UNALLOCATED(6,6), 2430 ID_UNALLOCATED(6,7), 2431 2432 /* CRm=7 */ 2433 ID_WRITABLE(ID_AA64MMFR0_EL1, ~(ID_AA64MMFR0_EL1_RES0 | 2434 ID_AA64MMFR0_EL1_TGRAN4_2 | 2435 ID_AA64MMFR0_EL1_TGRAN64_2 | 2436 ID_AA64MMFR0_EL1_TGRAN16_2)), 2437 ID_WRITABLE(ID_AA64MMFR1_EL1, ~(ID_AA64MMFR1_EL1_RES0 | 2438 ID_AA64MMFR1_EL1_HCX | 2439 ID_AA64MMFR1_EL1_TWED | 2440 ID_AA64MMFR1_EL1_XNX | 2441 ID_AA64MMFR1_EL1_VH | 2442 ID_AA64MMFR1_EL1_VMIDBits)), 2443 ID_WRITABLE(ID_AA64MMFR2_EL1, ~(ID_AA64MMFR2_EL1_RES0 | 2444 ID_AA64MMFR2_EL1_EVT | 2445 ID_AA64MMFR2_EL1_FWB | 2446 ID_AA64MMFR2_EL1_IDS | 2447 ID_AA64MMFR2_EL1_NV | 2448 ID_AA64MMFR2_EL1_CCIDX)), 2449 ID_SANITISED(ID_AA64MMFR3_EL1), 2450 ID_SANITISED(ID_AA64MMFR4_EL1), 2451 ID_UNALLOCATED(7,5), 2452 ID_UNALLOCATED(7,6), 2453 ID_UNALLOCATED(7,7), 2454 2455 { SYS_DESC(SYS_SCTLR_EL1), access_vm_reg, reset_val, SCTLR_EL1, 0x00C50078 }, 2456 { SYS_DESC(SYS_ACTLR_EL1), access_actlr, reset_actlr, ACTLR_EL1 }, 2457 { SYS_DESC(SYS_CPACR_EL1), NULL, reset_val, CPACR_EL1, 0 }, 2458 2459 MTE_REG(RGSR_EL1), 2460 MTE_REG(GCR_EL1), 2461 2462 { SYS_DESC(SYS_ZCR_EL1), NULL, reset_val, ZCR_EL1, 0, .visibility = sve_visibility }, 2463 { SYS_DESC(SYS_TRFCR_EL1), undef_access }, 2464 { SYS_DESC(SYS_SMPRI_EL1), undef_access }, 2465 { SYS_DESC(SYS_SMCR_EL1), undef_access }, 2466 { SYS_DESC(SYS_TTBR0_EL1), access_vm_reg, reset_unknown, TTBR0_EL1 }, 2467 { SYS_DESC(SYS_TTBR1_EL1), access_vm_reg, reset_unknown, TTBR1_EL1 }, 2468 { SYS_DESC(SYS_TCR_EL1), access_vm_reg, reset_val, TCR_EL1, 0 }, 2469 { SYS_DESC(SYS_TCR2_EL1), access_vm_reg, reset_val, TCR2_EL1, 0 }, 2470 2471 PTRAUTH_KEY(APIA), 2472 PTRAUTH_KEY(APIB), 2473 PTRAUTH_KEY(APDA), 2474 PTRAUTH_KEY(APDB), 2475 PTRAUTH_KEY(APGA), 2476 2477 { SYS_DESC(SYS_SPSR_EL1), access_spsr}, 2478 { SYS_DESC(SYS_ELR_EL1), access_elr}, 2479 2480 { SYS_DESC(SYS_AFSR0_EL1), access_vm_reg, reset_unknown, AFSR0_EL1 }, 2481 { SYS_DESC(SYS_AFSR1_EL1), access_vm_reg, reset_unknown, AFSR1_EL1 }, 2482 { SYS_DESC(SYS_ESR_EL1), access_vm_reg, reset_unknown, ESR_EL1 }, 2483 2484 { SYS_DESC(SYS_ERRIDR_EL1), trap_raz_wi }, 2485 { SYS_DESC(SYS_ERRSELR_EL1), trap_raz_wi }, 2486 { SYS_DESC(SYS_ERXFR_EL1), trap_raz_wi }, 2487 { SYS_DESC(SYS_ERXCTLR_EL1), trap_raz_wi }, 2488 { SYS_DESC(SYS_ERXSTATUS_EL1), trap_raz_wi }, 2489 { SYS_DESC(SYS_ERXADDR_EL1), trap_raz_wi }, 2490 { SYS_DESC(SYS_ERXMISC0_EL1), trap_raz_wi }, 2491 { SYS_DESC(SYS_ERXMISC1_EL1), trap_raz_wi }, 2492 2493 MTE_REG(TFSR_EL1), 2494 MTE_REG(TFSRE0_EL1), 2495 2496 { SYS_DESC(SYS_FAR_EL1), access_vm_reg, reset_unknown, FAR_EL1 }, 2497 { SYS_DESC(SYS_PAR_EL1), NULL, reset_unknown, PAR_EL1 }, 2498 2499 { SYS_DESC(SYS_PMSCR_EL1), undef_access }, 2500 { SYS_DESC(SYS_PMSNEVFR_EL1), undef_access }, 2501 { SYS_DESC(SYS_PMSICR_EL1), undef_access }, 2502 { SYS_DESC(SYS_PMSIRR_EL1), undef_access }, 2503 { SYS_DESC(SYS_PMSFCR_EL1), undef_access }, 2504 { SYS_DESC(SYS_PMSEVFR_EL1), undef_access }, 2505 { SYS_DESC(SYS_PMSLATFR_EL1), undef_access }, 2506 { SYS_DESC(SYS_PMSIDR_EL1), undef_access }, 2507 { SYS_DESC(SYS_PMBLIMITR_EL1), undef_access }, 2508 { SYS_DESC(SYS_PMBPTR_EL1), undef_access }, 2509 { SYS_DESC(SYS_PMBSR_EL1), undef_access }, 2510 /* PMBIDR_EL1 is not trapped */ 2511 2512 { PMU_SYS_REG(PMINTENSET_EL1), 2513 .access = access_pminten, .reg = PMINTENSET_EL1, 2514 .get_user = get_pmreg, .set_user = set_pmreg }, 2515 { PMU_SYS_REG(PMINTENCLR_EL1), 2516 .access = access_pminten, .reg = PMINTENSET_EL1, 2517 .get_user = get_pmreg, .set_user = set_pmreg }, 2518 { SYS_DESC(SYS_PMMIR_EL1), trap_raz_wi }, 2519 2520 { SYS_DESC(SYS_MAIR_EL1), access_vm_reg, reset_unknown, MAIR_EL1 }, 2521 { SYS_DESC(SYS_PIRE0_EL1), NULL, reset_unknown, PIRE0_EL1 }, 2522 { SYS_DESC(SYS_PIR_EL1), NULL, reset_unknown, PIR_EL1 }, 2523 { SYS_DESC(SYS_AMAIR_EL1), access_vm_reg, reset_amair_el1, AMAIR_EL1 }, 2524 2525 { SYS_DESC(SYS_LORSA_EL1), trap_loregion }, 2526 { SYS_DESC(SYS_LOREA_EL1), trap_loregion }, 2527 { SYS_DESC(SYS_LORN_EL1), trap_loregion }, 2528 { SYS_DESC(SYS_LORC_EL1), trap_loregion }, 2529 { SYS_DESC(SYS_LORID_EL1), trap_loregion }, 2530 2531 { SYS_DESC(SYS_VBAR_EL1), access_rw, reset_val, VBAR_EL1, 0 }, 2532 { SYS_DESC(SYS_DISR_EL1), NULL, reset_val, DISR_EL1, 0 }, 2533 2534 { SYS_DESC(SYS_ICC_IAR0_EL1), write_to_read_only }, 2535 { SYS_DESC(SYS_ICC_EOIR0_EL1), read_from_write_only }, 2536 { SYS_DESC(SYS_ICC_HPPIR0_EL1), write_to_read_only }, 2537 { SYS_DESC(SYS_ICC_DIR_EL1), read_from_write_only }, 2538 { SYS_DESC(SYS_ICC_RPR_EL1), write_to_read_only }, 2539 { SYS_DESC(SYS_ICC_SGI1R_EL1), access_gic_sgi }, 2540 { SYS_DESC(SYS_ICC_ASGI1R_EL1), access_gic_sgi }, 2541 { SYS_DESC(SYS_ICC_SGI0R_EL1), access_gic_sgi }, 2542 { SYS_DESC(SYS_ICC_IAR1_EL1), write_to_read_only }, 2543 { SYS_DESC(SYS_ICC_EOIR1_EL1), read_from_write_only }, 2544 { SYS_DESC(SYS_ICC_HPPIR1_EL1), write_to_read_only }, 2545 { SYS_DESC(SYS_ICC_SRE_EL1), access_gic_sre }, 2546 2547 { SYS_DESC(SYS_CONTEXTIDR_EL1), access_vm_reg, reset_val, CONTEXTIDR_EL1, 0 }, 2548 { SYS_DESC(SYS_TPIDR_EL1), NULL, reset_unknown, TPIDR_EL1 }, 2549 2550 { SYS_DESC(SYS_ACCDATA_EL1), undef_access }, 2551 2552 { SYS_DESC(SYS_SCXTNUM_EL1), undef_access }, 2553 2554 { SYS_DESC(SYS_CNTKCTL_EL1), NULL, reset_val, CNTKCTL_EL1, 0}, 2555 2556 { SYS_DESC(SYS_CCSIDR_EL1), access_ccsidr }, 2557 { SYS_DESC(SYS_CLIDR_EL1), access_clidr, reset_clidr, CLIDR_EL1, 2558 .set_user = set_clidr, .val = ~CLIDR_EL1_RES0 }, 2559 { SYS_DESC(SYS_CCSIDR2_EL1), undef_access }, 2560 { SYS_DESC(SYS_SMIDR_EL1), undef_access }, 2561 { SYS_DESC(SYS_CSSELR_EL1), access_csselr, reset_unknown, CSSELR_EL1 }, 2562 ID_WRITABLE(CTR_EL0, CTR_EL0_DIC_MASK | 2563 CTR_EL0_IDC_MASK | 2564 CTR_EL0_DminLine_MASK | 2565 CTR_EL0_IminLine_MASK), 2566 { SYS_DESC(SYS_SVCR), undef_access, reset_val, SVCR, 0, .visibility = sme_visibility }, 2567 { SYS_DESC(SYS_FPMR), undef_access, reset_val, FPMR, 0, .visibility = fp8_visibility }, 2568 2569 { PMU_SYS_REG(PMCR_EL0), .access = access_pmcr, .reset = reset_pmcr, 2570 .reg = PMCR_EL0, .get_user = get_pmcr, .set_user = set_pmcr }, 2571 { PMU_SYS_REG(PMCNTENSET_EL0), 2572 .access = access_pmcnten, .reg = PMCNTENSET_EL0, 2573 .get_user = get_pmreg, .set_user = set_pmreg }, 2574 { PMU_SYS_REG(PMCNTENCLR_EL0), 2575 .access = access_pmcnten, .reg = PMCNTENSET_EL0, 2576 .get_user = get_pmreg, .set_user = set_pmreg }, 2577 { PMU_SYS_REG(PMOVSCLR_EL0), 2578 .access = access_pmovs, .reg = PMOVSSET_EL0, 2579 .get_user = get_pmreg, .set_user = set_pmreg }, 2580 /* 2581 * PM_SWINC_EL0 is exposed to userspace as RAZ/WI, as it was 2582 * previously (and pointlessly) advertised in the past... 2583 */ 2584 { PMU_SYS_REG(PMSWINC_EL0), 2585 .get_user = get_raz_reg, .set_user = set_wi_reg, 2586 .access = access_pmswinc, .reset = NULL }, 2587 { PMU_SYS_REG(PMSELR_EL0), 2588 .access = access_pmselr, .reset = reset_pmselr, .reg = PMSELR_EL0 }, 2589 { PMU_SYS_REG(PMCEID0_EL0), 2590 .access = access_pmceid, .reset = NULL }, 2591 { PMU_SYS_REG(PMCEID1_EL0), 2592 .access = access_pmceid, .reset = NULL }, 2593 { PMU_SYS_REG(PMCCNTR_EL0), 2594 .access = access_pmu_evcntr, .reset = reset_unknown, 2595 .reg = PMCCNTR_EL0, .get_user = get_pmu_evcntr}, 2596 { PMU_SYS_REG(PMXEVTYPER_EL0), 2597 .access = access_pmu_evtyper, .reset = NULL }, 2598 { PMU_SYS_REG(PMXEVCNTR_EL0), 2599 .access = access_pmu_evcntr, .reset = NULL }, 2600 /* 2601 * PMUSERENR_EL0 resets as unknown in 64bit mode while it resets as zero 2602 * in 32bit mode. Here we choose to reset it as zero for consistency. 2603 */ 2604 { PMU_SYS_REG(PMUSERENR_EL0), .access = access_pmuserenr, 2605 .reset = reset_val, .reg = PMUSERENR_EL0, .val = 0 }, 2606 { PMU_SYS_REG(PMOVSSET_EL0), 2607 .access = access_pmovs, .reg = PMOVSSET_EL0, 2608 .get_user = get_pmreg, .set_user = set_pmreg }, 2609 2610 { SYS_DESC(SYS_TPIDR_EL0), NULL, reset_unknown, TPIDR_EL0 }, 2611 { SYS_DESC(SYS_TPIDRRO_EL0), NULL, reset_unknown, TPIDRRO_EL0 }, 2612 { SYS_DESC(SYS_TPIDR2_EL0), undef_access }, 2613 2614 { SYS_DESC(SYS_SCXTNUM_EL0), undef_access }, 2615 2616 { SYS_DESC(SYS_AMCR_EL0), undef_access }, 2617 { SYS_DESC(SYS_AMCFGR_EL0), undef_access }, 2618 { SYS_DESC(SYS_AMCGCR_EL0), undef_access }, 2619 { SYS_DESC(SYS_AMUSERENR_EL0), undef_access }, 2620 { SYS_DESC(SYS_AMCNTENCLR0_EL0), undef_access }, 2621 { SYS_DESC(SYS_AMCNTENSET0_EL0), undef_access }, 2622 { SYS_DESC(SYS_AMCNTENCLR1_EL0), undef_access }, 2623 { SYS_DESC(SYS_AMCNTENSET1_EL0), undef_access }, 2624 AMU_AMEVCNTR0_EL0(0), 2625 AMU_AMEVCNTR0_EL0(1), 2626 AMU_AMEVCNTR0_EL0(2), 2627 AMU_AMEVCNTR0_EL0(3), 2628 AMU_AMEVCNTR0_EL0(4), 2629 AMU_AMEVCNTR0_EL0(5), 2630 AMU_AMEVCNTR0_EL0(6), 2631 AMU_AMEVCNTR0_EL0(7), 2632 AMU_AMEVCNTR0_EL0(8), 2633 AMU_AMEVCNTR0_EL0(9), 2634 AMU_AMEVCNTR0_EL0(10), 2635 AMU_AMEVCNTR0_EL0(11), 2636 AMU_AMEVCNTR0_EL0(12), 2637 AMU_AMEVCNTR0_EL0(13), 2638 AMU_AMEVCNTR0_EL0(14), 2639 AMU_AMEVCNTR0_EL0(15), 2640 AMU_AMEVTYPER0_EL0(0), 2641 AMU_AMEVTYPER0_EL0(1), 2642 AMU_AMEVTYPER0_EL0(2), 2643 AMU_AMEVTYPER0_EL0(3), 2644 AMU_AMEVTYPER0_EL0(4), 2645 AMU_AMEVTYPER0_EL0(5), 2646 AMU_AMEVTYPER0_EL0(6), 2647 AMU_AMEVTYPER0_EL0(7), 2648 AMU_AMEVTYPER0_EL0(8), 2649 AMU_AMEVTYPER0_EL0(9), 2650 AMU_AMEVTYPER0_EL0(10), 2651 AMU_AMEVTYPER0_EL0(11), 2652 AMU_AMEVTYPER0_EL0(12), 2653 AMU_AMEVTYPER0_EL0(13), 2654 AMU_AMEVTYPER0_EL0(14), 2655 AMU_AMEVTYPER0_EL0(15), 2656 AMU_AMEVCNTR1_EL0(0), 2657 AMU_AMEVCNTR1_EL0(1), 2658 AMU_AMEVCNTR1_EL0(2), 2659 AMU_AMEVCNTR1_EL0(3), 2660 AMU_AMEVCNTR1_EL0(4), 2661 AMU_AMEVCNTR1_EL0(5), 2662 AMU_AMEVCNTR1_EL0(6), 2663 AMU_AMEVCNTR1_EL0(7), 2664 AMU_AMEVCNTR1_EL0(8), 2665 AMU_AMEVCNTR1_EL0(9), 2666 AMU_AMEVCNTR1_EL0(10), 2667 AMU_AMEVCNTR1_EL0(11), 2668 AMU_AMEVCNTR1_EL0(12), 2669 AMU_AMEVCNTR1_EL0(13), 2670 AMU_AMEVCNTR1_EL0(14), 2671 AMU_AMEVCNTR1_EL0(15), 2672 AMU_AMEVTYPER1_EL0(0), 2673 AMU_AMEVTYPER1_EL0(1), 2674 AMU_AMEVTYPER1_EL0(2), 2675 AMU_AMEVTYPER1_EL0(3), 2676 AMU_AMEVTYPER1_EL0(4), 2677 AMU_AMEVTYPER1_EL0(5), 2678 AMU_AMEVTYPER1_EL0(6), 2679 AMU_AMEVTYPER1_EL0(7), 2680 AMU_AMEVTYPER1_EL0(8), 2681 AMU_AMEVTYPER1_EL0(9), 2682 AMU_AMEVTYPER1_EL0(10), 2683 AMU_AMEVTYPER1_EL0(11), 2684 AMU_AMEVTYPER1_EL0(12), 2685 AMU_AMEVTYPER1_EL0(13), 2686 AMU_AMEVTYPER1_EL0(14), 2687 AMU_AMEVTYPER1_EL0(15), 2688 2689 { SYS_DESC(SYS_CNTPCT_EL0), access_arch_timer }, 2690 { SYS_DESC(SYS_CNTPCTSS_EL0), access_arch_timer }, 2691 { SYS_DESC(SYS_CNTP_TVAL_EL0), access_arch_timer }, 2692 { SYS_DESC(SYS_CNTP_CTL_EL0), access_arch_timer }, 2693 { SYS_DESC(SYS_CNTP_CVAL_EL0), access_arch_timer }, 2694 2695 /* PMEVCNTRn_EL0 */ 2696 PMU_PMEVCNTR_EL0(0), 2697 PMU_PMEVCNTR_EL0(1), 2698 PMU_PMEVCNTR_EL0(2), 2699 PMU_PMEVCNTR_EL0(3), 2700 PMU_PMEVCNTR_EL0(4), 2701 PMU_PMEVCNTR_EL0(5), 2702 PMU_PMEVCNTR_EL0(6), 2703 PMU_PMEVCNTR_EL0(7), 2704 PMU_PMEVCNTR_EL0(8), 2705 PMU_PMEVCNTR_EL0(9), 2706 PMU_PMEVCNTR_EL0(10), 2707 PMU_PMEVCNTR_EL0(11), 2708 PMU_PMEVCNTR_EL0(12), 2709 PMU_PMEVCNTR_EL0(13), 2710 PMU_PMEVCNTR_EL0(14), 2711 PMU_PMEVCNTR_EL0(15), 2712 PMU_PMEVCNTR_EL0(16), 2713 PMU_PMEVCNTR_EL0(17), 2714 PMU_PMEVCNTR_EL0(18), 2715 PMU_PMEVCNTR_EL0(19), 2716 PMU_PMEVCNTR_EL0(20), 2717 PMU_PMEVCNTR_EL0(21), 2718 PMU_PMEVCNTR_EL0(22), 2719 PMU_PMEVCNTR_EL0(23), 2720 PMU_PMEVCNTR_EL0(24), 2721 PMU_PMEVCNTR_EL0(25), 2722 PMU_PMEVCNTR_EL0(26), 2723 PMU_PMEVCNTR_EL0(27), 2724 PMU_PMEVCNTR_EL0(28), 2725 PMU_PMEVCNTR_EL0(29), 2726 PMU_PMEVCNTR_EL0(30), 2727 /* PMEVTYPERn_EL0 */ 2728 PMU_PMEVTYPER_EL0(0), 2729 PMU_PMEVTYPER_EL0(1), 2730 PMU_PMEVTYPER_EL0(2), 2731 PMU_PMEVTYPER_EL0(3), 2732 PMU_PMEVTYPER_EL0(4), 2733 PMU_PMEVTYPER_EL0(5), 2734 PMU_PMEVTYPER_EL0(6), 2735 PMU_PMEVTYPER_EL0(7), 2736 PMU_PMEVTYPER_EL0(8), 2737 PMU_PMEVTYPER_EL0(9), 2738 PMU_PMEVTYPER_EL0(10), 2739 PMU_PMEVTYPER_EL0(11), 2740 PMU_PMEVTYPER_EL0(12), 2741 PMU_PMEVTYPER_EL0(13), 2742 PMU_PMEVTYPER_EL0(14), 2743 PMU_PMEVTYPER_EL0(15), 2744 PMU_PMEVTYPER_EL0(16), 2745 PMU_PMEVTYPER_EL0(17), 2746 PMU_PMEVTYPER_EL0(18), 2747 PMU_PMEVTYPER_EL0(19), 2748 PMU_PMEVTYPER_EL0(20), 2749 PMU_PMEVTYPER_EL0(21), 2750 PMU_PMEVTYPER_EL0(22), 2751 PMU_PMEVTYPER_EL0(23), 2752 PMU_PMEVTYPER_EL0(24), 2753 PMU_PMEVTYPER_EL0(25), 2754 PMU_PMEVTYPER_EL0(26), 2755 PMU_PMEVTYPER_EL0(27), 2756 PMU_PMEVTYPER_EL0(28), 2757 PMU_PMEVTYPER_EL0(29), 2758 PMU_PMEVTYPER_EL0(30), 2759 /* 2760 * PMCCFILTR_EL0 resets as unknown in 64bit mode while it resets as zero 2761 * in 32bit mode. Here we choose to reset it as zero for consistency. 2762 */ 2763 { PMU_SYS_REG(PMCCFILTR_EL0), .access = access_pmu_evtyper, 2764 .reset = reset_val, .reg = PMCCFILTR_EL0, .val = 0 }, 2765 2766 EL2_REG_VNCR(VPIDR_EL2, reset_unknown, 0), 2767 EL2_REG_VNCR(VMPIDR_EL2, reset_unknown, 0), 2768 EL2_REG(SCTLR_EL2, access_rw, reset_val, SCTLR_EL2_RES1), 2769 EL2_REG(ACTLR_EL2, access_rw, reset_val, 0), 2770 EL2_REG_VNCR(HCR_EL2, reset_hcr, 0), 2771 EL2_REG(MDCR_EL2, access_rw, reset_val, 0), 2772 EL2_REG(CPTR_EL2, access_rw, reset_val, CPTR_NVHE_EL2_RES1), 2773 EL2_REG_VNCR(HSTR_EL2, reset_val, 0), 2774 EL2_REG_VNCR(HFGRTR_EL2, reset_val, 0), 2775 EL2_REG_VNCR(HFGWTR_EL2, reset_val, 0), 2776 EL2_REG_VNCR(HFGITR_EL2, reset_val, 0), 2777 EL2_REG_VNCR(HACR_EL2, reset_val, 0), 2778 2779 { SYS_DESC(SYS_ZCR_EL2), .access = access_zcr_el2, .reset = reset_val, 2780 .visibility = sve_el2_visibility, .reg = ZCR_EL2 }, 2781 2782 EL2_REG_VNCR(HCRX_EL2, reset_val, 0), 2783 2784 EL2_REG(TTBR0_EL2, access_rw, reset_val, 0), 2785 EL2_REG(TTBR1_EL2, access_rw, reset_val, 0), 2786 EL2_REG(TCR_EL2, access_rw, reset_val, TCR_EL2_RES1), 2787 EL2_REG_VNCR(VTTBR_EL2, reset_val, 0), 2788 EL2_REG_VNCR(VTCR_EL2, reset_val, 0), 2789 2790 { SYS_DESC(SYS_DACR32_EL2), trap_undef, reset_unknown, DACR32_EL2 }, 2791 EL2_REG_VNCR(HDFGRTR_EL2, reset_val, 0), 2792 EL2_REG_VNCR(HDFGWTR_EL2, reset_val, 0), 2793 EL2_REG_VNCR(HAFGRTR_EL2, reset_val, 0), 2794 EL2_REG_REDIR(SPSR_EL2, reset_val, 0), 2795 EL2_REG_REDIR(ELR_EL2, reset_val, 0), 2796 { SYS_DESC(SYS_SP_EL1), access_sp_el1}, 2797 2798 /* AArch32 SPSR_* are RES0 if trapped from a NV guest */ 2799 { SYS_DESC(SYS_SPSR_irq), .access = trap_raz_wi, 2800 .visibility = hidden_user_visibility }, 2801 { SYS_DESC(SYS_SPSR_abt), .access = trap_raz_wi, 2802 .visibility = hidden_user_visibility }, 2803 { SYS_DESC(SYS_SPSR_und), .access = trap_raz_wi, 2804 .visibility = hidden_user_visibility }, 2805 { SYS_DESC(SYS_SPSR_fiq), .access = trap_raz_wi, 2806 .visibility = hidden_user_visibility }, 2807 2808 { SYS_DESC(SYS_IFSR32_EL2), trap_undef, reset_unknown, IFSR32_EL2 }, 2809 EL2_REG(AFSR0_EL2, access_rw, reset_val, 0), 2810 EL2_REG(AFSR1_EL2, access_rw, reset_val, 0), 2811 EL2_REG_REDIR(ESR_EL2, reset_val, 0), 2812 { SYS_DESC(SYS_FPEXC32_EL2), trap_undef, reset_val, FPEXC32_EL2, 0x700 }, 2813 2814 EL2_REG_REDIR(FAR_EL2, reset_val, 0), 2815 EL2_REG(HPFAR_EL2, access_rw, reset_val, 0), 2816 2817 EL2_REG(MAIR_EL2, access_rw, reset_val, 0), 2818 EL2_REG(AMAIR_EL2, access_rw, reset_val, 0), 2819 2820 EL2_REG(VBAR_EL2, access_rw, reset_val, 0), 2821 EL2_REG(RVBAR_EL2, access_rw, reset_val, 0), 2822 { SYS_DESC(SYS_RMR_EL2), trap_undef }, 2823 2824 EL2_REG(CONTEXTIDR_EL2, access_rw, reset_val, 0), 2825 EL2_REG(TPIDR_EL2, access_rw, reset_val, 0), 2826 2827 EL2_REG_VNCR(CNTVOFF_EL2, reset_val, 0), 2828 EL2_REG(CNTHCTL_EL2, access_rw, reset_val, 0), 2829 2830 EL12_REG(CNTKCTL, access_rw, reset_val, 0), 2831 2832 EL2_REG(SP_EL2, NULL, reset_unknown, 0), 2833 }; 2834 2835 static bool kvm_supported_tlbi_s12_op(struct kvm_vcpu *vpcu, u32 instr) 2836 { 2837 struct kvm *kvm = vpcu->kvm; 2838 u8 CRm = sys_reg_CRm(instr); 2839 2840 if (sys_reg_CRn(instr) == TLBI_CRn_nXS && 2841 !kvm_has_feat(kvm, ID_AA64ISAR1_EL1, XS, IMP)) 2842 return false; 2843 2844 if (CRm == TLBI_CRm_nROS && 2845 !kvm_has_feat(kvm, ID_AA64ISAR0_EL1, TLB, OS)) 2846 return false; 2847 2848 return true; 2849 } 2850 2851 static bool handle_alle1is(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 2852 const struct sys_reg_desc *r) 2853 { 2854 u32 sys_encoding = sys_insn(p->Op0, p->Op1, p->CRn, p->CRm, p->Op2); 2855 2856 if (!kvm_supported_tlbi_s12_op(vcpu, sys_encoding)) { 2857 kvm_inject_undefined(vcpu); 2858 return false; 2859 } 2860 2861 write_lock(&vcpu->kvm->mmu_lock); 2862 2863 /* 2864 * Drop all shadow S2s, resulting in S1/S2 TLBIs for each of the 2865 * corresponding VMIDs. 2866 */ 2867 kvm_nested_s2_unmap(vcpu->kvm); 2868 2869 write_unlock(&vcpu->kvm->mmu_lock); 2870 2871 return true; 2872 } 2873 2874 static bool kvm_supported_tlbi_ipas2_op(struct kvm_vcpu *vpcu, u32 instr) 2875 { 2876 struct kvm *kvm = vpcu->kvm; 2877 u8 CRm = sys_reg_CRm(instr); 2878 u8 Op2 = sys_reg_Op2(instr); 2879 2880 if (sys_reg_CRn(instr) == TLBI_CRn_nXS && 2881 !kvm_has_feat(kvm, ID_AA64ISAR1_EL1, XS, IMP)) 2882 return false; 2883 2884 if (CRm == TLBI_CRm_IPAIS && (Op2 == 2 || Op2 == 6) && 2885 !kvm_has_feat(kvm, ID_AA64ISAR0_EL1, TLB, RANGE)) 2886 return false; 2887 2888 if (CRm == TLBI_CRm_IPAONS && (Op2 == 0 || Op2 == 4) && 2889 !kvm_has_feat(kvm, ID_AA64ISAR0_EL1, TLB, OS)) 2890 return false; 2891 2892 if (CRm == TLBI_CRm_IPAONS && (Op2 == 3 || Op2 == 7) && 2893 !kvm_has_feat(kvm, ID_AA64ISAR0_EL1, TLB, RANGE)) 2894 return false; 2895 2896 return true; 2897 } 2898 2899 /* Only defined here as this is an internal "abstraction" */ 2900 union tlbi_info { 2901 struct { 2902 u64 start; 2903 u64 size; 2904 } range; 2905 2906 struct { 2907 u64 addr; 2908 } ipa; 2909 2910 struct { 2911 u64 addr; 2912 u32 encoding; 2913 } va; 2914 }; 2915 2916 static void s2_mmu_unmap_range(struct kvm_s2_mmu *mmu, 2917 const union tlbi_info *info) 2918 { 2919 kvm_stage2_unmap_range(mmu, info->range.start, info->range.size); 2920 } 2921 2922 static bool handle_vmalls12e1is(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 2923 const struct sys_reg_desc *r) 2924 { 2925 u32 sys_encoding = sys_insn(p->Op0, p->Op1, p->CRn, p->CRm, p->Op2); 2926 u64 limit, vttbr; 2927 2928 if (!kvm_supported_tlbi_s12_op(vcpu, sys_encoding)) { 2929 kvm_inject_undefined(vcpu); 2930 return false; 2931 } 2932 2933 vttbr = vcpu_read_sys_reg(vcpu, VTTBR_EL2); 2934 limit = BIT_ULL(kvm_get_pa_bits(vcpu->kvm)); 2935 2936 kvm_s2_mmu_iterate_by_vmid(vcpu->kvm, get_vmid(vttbr), 2937 &(union tlbi_info) { 2938 .range = { 2939 .start = 0, 2940 .size = limit, 2941 }, 2942 }, 2943 s2_mmu_unmap_range); 2944 2945 return true; 2946 } 2947 2948 static bool handle_ripas2e1is(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 2949 const struct sys_reg_desc *r) 2950 { 2951 u32 sys_encoding = sys_insn(p->Op0, p->Op1, p->CRn, p->CRm, p->Op2); 2952 u64 vttbr = vcpu_read_sys_reg(vcpu, VTTBR_EL2); 2953 u64 base, range, tg, num, scale; 2954 int shift; 2955 2956 if (!kvm_supported_tlbi_ipas2_op(vcpu, sys_encoding)) { 2957 kvm_inject_undefined(vcpu); 2958 return false; 2959 } 2960 2961 /* 2962 * Because the shadow S2 structure doesn't necessarily reflect that 2963 * of the guest's S2 (different base granule size, for example), we 2964 * decide to ignore TTL and only use the described range. 2965 */ 2966 tg = FIELD_GET(GENMASK(47, 46), p->regval); 2967 scale = FIELD_GET(GENMASK(45, 44), p->regval); 2968 num = FIELD_GET(GENMASK(43, 39), p->regval); 2969 base = p->regval & GENMASK(36, 0); 2970 2971 switch(tg) { 2972 case 1: 2973 shift = 12; 2974 break; 2975 case 2: 2976 shift = 14; 2977 break; 2978 case 3: 2979 default: /* IMPDEF: handle tg==0 as 64k */ 2980 shift = 16; 2981 break; 2982 } 2983 2984 base <<= shift; 2985 range = __TLBI_RANGE_PAGES(num, scale) << shift; 2986 2987 kvm_s2_mmu_iterate_by_vmid(vcpu->kvm, get_vmid(vttbr), 2988 &(union tlbi_info) { 2989 .range = { 2990 .start = base, 2991 .size = range, 2992 }, 2993 }, 2994 s2_mmu_unmap_range); 2995 2996 return true; 2997 } 2998 2999 static void s2_mmu_unmap_ipa(struct kvm_s2_mmu *mmu, 3000 const union tlbi_info *info) 3001 { 3002 unsigned long max_size; 3003 u64 base_addr; 3004 3005 /* 3006 * We drop a number of things from the supplied value: 3007 * 3008 * - NS bit: we're non-secure only. 3009 * 3010 * - IPA[51:48]: We don't support 52bit IPA just yet... 3011 * 3012 * And of course, adjust the IPA to be on an actual address. 3013 */ 3014 base_addr = (info->ipa.addr & GENMASK_ULL(35, 0)) << 12; 3015 max_size = compute_tlb_inval_range(mmu, info->ipa.addr); 3016 base_addr &= ~(max_size - 1); 3017 3018 kvm_stage2_unmap_range(mmu, base_addr, max_size); 3019 } 3020 3021 static bool handle_ipas2e1is(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 3022 const struct sys_reg_desc *r) 3023 { 3024 u32 sys_encoding = sys_insn(p->Op0, p->Op1, p->CRn, p->CRm, p->Op2); 3025 u64 vttbr = vcpu_read_sys_reg(vcpu, VTTBR_EL2); 3026 3027 if (!kvm_supported_tlbi_ipas2_op(vcpu, sys_encoding)) { 3028 kvm_inject_undefined(vcpu); 3029 return false; 3030 } 3031 3032 kvm_s2_mmu_iterate_by_vmid(vcpu->kvm, get_vmid(vttbr), 3033 &(union tlbi_info) { 3034 .ipa = { 3035 .addr = p->regval, 3036 }, 3037 }, 3038 s2_mmu_unmap_ipa); 3039 3040 return true; 3041 } 3042 3043 static void s2_mmu_tlbi_s1e1(struct kvm_s2_mmu *mmu, 3044 const union tlbi_info *info) 3045 { 3046 WARN_ON(__kvm_tlbi_s1e2(mmu, info->va.addr, info->va.encoding)); 3047 } 3048 3049 static bool handle_tlbi_el1(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 3050 const struct sys_reg_desc *r) 3051 { 3052 u32 sys_encoding = sys_insn(p->Op0, p->Op1, p->CRn, p->CRm, p->Op2); 3053 u64 vttbr = vcpu_read_sys_reg(vcpu, VTTBR_EL2); 3054 3055 /* 3056 * If we're here, this is because we've trapped on a EL1 TLBI 3057 * instruction that affects the EL1 translation regime while 3058 * we're running in a context that doesn't allow us to let the 3059 * HW do its thing (aka vEL2): 3060 * 3061 * - HCR_EL2.E2H == 0 : a non-VHE guest 3062 * - HCR_EL2.{E2H,TGE} == { 1, 0 } : a VHE guest in guest mode 3063 * 3064 * We don't expect these helpers to ever be called when running 3065 * in a vEL1 context. 3066 */ 3067 3068 WARN_ON(!vcpu_is_el2(vcpu)); 3069 3070 if (!kvm_supported_tlbi_s1e1_op(vcpu, sys_encoding)) { 3071 kvm_inject_undefined(vcpu); 3072 return false; 3073 } 3074 3075 kvm_s2_mmu_iterate_by_vmid(vcpu->kvm, get_vmid(vttbr), 3076 &(union tlbi_info) { 3077 .va = { 3078 .addr = p->regval, 3079 .encoding = sys_encoding, 3080 }, 3081 }, 3082 s2_mmu_tlbi_s1e1); 3083 3084 return true; 3085 } 3086 3087 #define SYS_INSN(insn, access_fn) \ 3088 { \ 3089 SYS_DESC(OP_##insn), \ 3090 .access = (access_fn), \ 3091 } 3092 3093 static struct sys_reg_desc sys_insn_descs[] = { 3094 { SYS_DESC(SYS_DC_ISW), access_dcsw }, 3095 { SYS_DESC(SYS_DC_IGSW), access_dcgsw }, 3096 { SYS_DESC(SYS_DC_IGDSW), access_dcgsw }, 3097 { SYS_DESC(SYS_DC_CSW), access_dcsw }, 3098 { SYS_DESC(SYS_DC_CGSW), access_dcgsw }, 3099 { SYS_DESC(SYS_DC_CGDSW), access_dcgsw }, 3100 { SYS_DESC(SYS_DC_CISW), access_dcsw }, 3101 { SYS_DESC(SYS_DC_CIGSW), access_dcgsw }, 3102 { SYS_DESC(SYS_DC_CIGDSW), access_dcgsw }, 3103 3104 SYS_INSN(TLBI_VMALLE1OS, handle_tlbi_el1), 3105 SYS_INSN(TLBI_VAE1OS, handle_tlbi_el1), 3106 SYS_INSN(TLBI_ASIDE1OS, handle_tlbi_el1), 3107 SYS_INSN(TLBI_VAAE1OS, handle_tlbi_el1), 3108 SYS_INSN(TLBI_VALE1OS, handle_tlbi_el1), 3109 SYS_INSN(TLBI_VAALE1OS, handle_tlbi_el1), 3110 3111 SYS_INSN(TLBI_RVAE1IS, handle_tlbi_el1), 3112 SYS_INSN(TLBI_RVAAE1IS, handle_tlbi_el1), 3113 SYS_INSN(TLBI_RVALE1IS, handle_tlbi_el1), 3114 SYS_INSN(TLBI_RVAALE1IS, handle_tlbi_el1), 3115 3116 SYS_INSN(TLBI_VMALLE1IS, handle_tlbi_el1), 3117 SYS_INSN(TLBI_VAE1IS, handle_tlbi_el1), 3118 SYS_INSN(TLBI_ASIDE1IS, handle_tlbi_el1), 3119 SYS_INSN(TLBI_VAAE1IS, handle_tlbi_el1), 3120 SYS_INSN(TLBI_VALE1IS, handle_tlbi_el1), 3121 SYS_INSN(TLBI_VAALE1IS, handle_tlbi_el1), 3122 3123 SYS_INSN(TLBI_RVAE1OS, handle_tlbi_el1), 3124 SYS_INSN(TLBI_RVAAE1OS, handle_tlbi_el1), 3125 SYS_INSN(TLBI_RVALE1OS, handle_tlbi_el1), 3126 SYS_INSN(TLBI_RVAALE1OS, handle_tlbi_el1), 3127 3128 SYS_INSN(TLBI_RVAE1, handle_tlbi_el1), 3129 SYS_INSN(TLBI_RVAAE1, handle_tlbi_el1), 3130 SYS_INSN(TLBI_RVALE1, handle_tlbi_el1), 3131 SYS_INSN(TLBI_RVAALE1, handle_tlbi_el1), 3132 3133 SYS_INSN(TLBI_VMALLE1, handle_tlbi_el1), 3134 SYS_INSN(TLBI_VAE1, handle_tlbi_el1), 3135 SYS_INSN(TLBI_ASIDE1, handle_tlbi_el1), 3136 SYS_INSN(TLBI_VAAE1, handle_tlbi_el1), 3137 SYS_INSN(TLBI_VALE1, handle_tlbi_el1), 3138 SYS_INSN(TLBI_VAALE1, handle_tlbi_el1), 3139 3140 SYS_INSN(TLBI_VMALLE1OSNXS, handle_tlbi_el1), 3141 SYS_INSN(TLBI_VAE1OSNXS, handle_tlbi_el1), 3142 SYS_INSN(TLBI_ASIDE1OSNXS, handle_tlbi_el1), 3143 SYS_INSN(TLBI_VAAE1OSNXS, handle_tlbi_el1), 3144 SYS_INSN(TLBI_VALE1OSNXS, handle_tlbi_el1), 3145 SYS_INSN(TLBI_VAALE1OSNXS, handle_tlbi_el1), 3146 3147 SYS_INSN(TLBI_RVAE1ISNXS, handle_tlbi_el1), 3148 SYS_INSN(TLBI_RVAAE1ISNXS, handle_tlbi_el1), 3149 SYS_INSN(TLBI_RVALE1ISNXS, handle_tlbi_el1), 3150 SYS_INSN(TLBI_RVAALE1ISNXS, handle_tlbi_el1), 3151 3152 SYS_INSN(TLBI_VMALLE1ISNXS, handle_tlbi_el1), 3153 SYS_INSN(TLBI_VAE1ISNXS, handle_tlbi_el1), 3154 SYS_INSN(TLBI_ASIDE1ISNXS, handle_tlbi_el1), 3155 SYS_INSN(TLBI_VAAE1ISNXS, handle_tlbi_el1), 3156 SYS_INSN(TLBI_VALE1ISNXS, handle_tlbi_el1), 3157 SYS_INSN(TLBI_VAALE1ISNXS, handle_tlbi_el1), 3158 3159 SYS_INSN(TLBI_RVAE1OSNXS, handle_tlbi_el1), 3160 SYS_INSN(TLBI_RVAAE1OSNXS, handle_tlbi_el1), 3161 SYS_INSN(TLBI_RVALE1OSNXS, handle_tlbi_el1), 3162 SYS_INSN(TLBI_RVAALE1OSNXS, handle_tlbi_el1), 3163 3164 SYS_INSN(TLBI_RVAE1NXS, handle_tlbi_el1), 3165 SYS_INSN(TLBI_RVAAE1NXS, handle_tlbi_el1), 3166 SYS_INSN(TLBI_RVALE1NXS, handle_tlbi_el1), 3167 SYS_INSN(TLBI_RVAALE1NXS, handle_tlbi_el1), 3168 3169 SYS_INSN(TLBI_VMALLE1NXS, handle_tlbi_el1), 3170 SYS_INSN(TLBI_VAE1NXS, handle_tlbi_el1), 3171 SYS_INSN(TLBI_ASIDE1NXS, handle_tlbi_el1), 3172 SYS_INSN(TLBI_VAAE1NXS, handle_tlbi_el1), 3173 SYS_INSN(TLBI_VALE1NXS, handle_tlbi_el1), 3174 SYS_INSN(TLBI_VAALE1NXS, handle_tlbi_el1), 3175 3176 SYS_INSN(TLBI_IPAS2E1IS, handle_ipas2e1is), 3177 SYS_INSN(TLBI_RIPAS2E1IS, handle_ripas2e1is), 3178 SYS_INSN(TLBI_IPAS2LE1IS, handle_ipas2e1is), 3179 SYS_INSN(TLBI_RIPAS2LE1IS, handle_ripas2e1is), 3180 3181 SYS_INSN(TLBI_ALLE2OS, trap_undef), 3182 SYS_INSN(TLBI_VAE2OS, trap_undef), 3183 SYS_INSN(TLBI_ALLE1OS, handle_alle1is), 3184 SYS_INSN(TLBI_VALE2OS, trap_undef), 3185 SYS_INSN(TLBI_VMALLS12E1OS, handle_vmalls12e1is), 3186 3187 SYS_INSN(TLBI_RVAE2IS, trap_undef), 3188 SYS_INSN(TLBI_RVALE2IS, trap_undef), 3189 3190 SYS_INSN(TLBI_ALLE1IS, handle_alle1is), 3191 SYS_INSN(TLBI_VMALLS12E1IS, handle_vmalls12e1is), 3192 SYS_INSN(TLBI_IPAS2E1OS, handle_ipas2e1is), 3193 SYS_INSN(TLBI_IPAS2E1, handle_ipas2e1is), 3194 SYS_INSN(TLBI_RIPAS2E1, handle_ripas2e1is), 3195 SYS_INSN(TLBI_RIPAS2E1OS, handle_ripas2e1is), 3196 SYS_INSN(TLBI_IPAS2LE1OS, handle_ipas2e1is), 3197 SYS_INSN(TLBI_IPAS2LE1, handle_ipas2e1is), 3198 SYS_INSN(TLBI_RIPAS2LE1, handle_ripas2e1is), 3199 SYS_INSN(TLBI_RIPAS2LE1OS, handle_ripas2e1is), 3200 SYS_INSN(TLBI_RVAE2OS, trap_undef), 3201 SYS_INSN(TLBI_RVALE2OS, trap_undef), 3202 SYS_INSN(TLBI_RVAE2, trap_undef), 3203 SYS_INSN(TLBI_RVALE2, trap_undef), 3204 SYS_INSN(TLBI_ALLE1, handle_alle1is), 3205 SYS_INSN(TLBI_VMALLS12E1, handle_vmalls12e1is), 3206 3207 SYS_INSN(TLBI_IPAS2E1ISNXS, handle_ipas2e1is), 3208 SYS_INSN(TLBI_RIPAS2E1ISNXS, handle_ripas2e1is), 3209 SYS_INSN(TLBI_IPAS2LE1ISNXS, handle_ipas2e1is), 3210 SYS_INSN(TLBI_RIPAS2LE1ISNXS, handle_ripas2e1is), 3211 3212 SYS_INSN(TLBI_ALLE2OSNXS, trap_undef), 3213 SYS_INSN(TLBI_VAE2OSNXS, trap_undef), 3214 SYS_INSN(TLBI_ALLE1OSNXS, handle_alle1is), 3215 SYS_INSN(TLBI_VALE2OSNXS, trap_undef), 3216 SYS_INSN(TLBI_VMALLS12E1OSNXS, handle_vmalls12e1is), 3217 3218 SYS_INSN(TLBI_RVAE2ISNXS, trap_undef), 3219 SYS_INSN(TLBI_RVALE2ISNXS, trap_undef), 3220 SYS_INSN(TLBI_ALLE2ISNXS, trap_undef), 3221 SYS_INSN(TLBI_VAE2ISNXS, trap_undef), 3222 3223 SYS_INSN(TLBI_ALLE1ISNXS, handle_alle1is), 3224 SYS_INSN(TLBI_VALE2ISNXS, trap_undef), 3225 SYS_INSN(TLBI_VMALLS12E1ISNXS, handle_vmalls12e1is), 3226 SYS_INSN(TLBI_IPAS2E1OSNXS, handle_ipas2e1is), 3227 SYS_INSN(TLBI_IPAS2E1NXS, handle_ipas2e1is), 3228 SYS_INSN(TLBI_RIPAS2E1NXS, handle_ripas2e1is), 3229 SYS_INSN(TLBI_RIPAS2E1OSNXS, handle_ripas2e1is), 3230 SYS_INSN(TLBI_IPAS2LE1OSNXS, handle_ipas2e1is), 3231 SYS_INSN(TLBI_IPAS2LE1NXS, handle_ipas2e1is), 3232 SYS_INSN(TLBI_RIPAS2LE1NXS, handle_ripas2e1is), 3233 SYS_INSN(TLBI_RIPAS2LE1OSNXS, handle_ripas2e1is), 3234 SYS_INSN(TLBI_RVAE2OSNXS, trap_undef), 3235 SYS_INSN(TLBI_RVALE2OSNXS, trap_undef), 3236 SYS_INSN(TLBI_RVAE2NXS, trap_undef), 3237 SYS_INSN(TLBI_RVALE2NXS, trap_undef), 3238 SYS_INSN(TLBI_ALLE2NXS, trap_undef), 3239 SYS_INSN(TLBI_VAE2NXS, trap_undef), 3240 SYS_INSN(TLBI_ALLE1NXS, handle_alle1is), 3241 SYS_INSN(TLBI_VALE2NXS, trap_undef), 3242 SYS_INSN(TLBI_VMALLS12E1NXS, handle_vmalls12e1is), 3243 }; 3244 3245 static bool trap_dbgdidr(struct kvm_vcpu *vcpu, 3246 struct sys_reg_params *p, 3247 const struct sys_reg_desc *r) 3248 { 3249 if (p->is_write) { 3250 return ignore_write(vcpu, p); 3251 } else { 3252 u64 dfr = kvm_read_vm_id_reg(vcpu->kvm, SYS_ID_AA64DFR0_EL1); 3253 u32 el3 = kvm_has_feat(vcpu->kvm, ID_AA64PFR0_EL1, EL3, IMP); 3254 3255 p->regval = ((SYS_FIELD_GET(ID_AA64DFR0_EL1, WRPs, dfr) << 28) | 3256 (SYS_FIELD_GET(ID_AA64DFR0_EL1, BRPs, dfr) << 24) | 3257 (SYS_FIELD_GET(ID_AA64DFR0_EL1, CTX_CMPs, dfr) << 20) | 3258 (SYS_FIELD_GET(ID_AA64DFR0_EL1, DebugVer, dfr) << 16) | 3259 (1 << 15) | (el3 << 14) | (el3 << 12)); 3260 return true; 3261 } 3262 } 3263 3264 /* 3265 * AArch32 debug register mappings 3266 * 3267 * AArch32 DBGBVRn is mapped to DBGBVRn_EL1[31:0] 3268 * AArch32 DBGBXVRn is mapped to DBGBVRn_EL1[63:32] 3269 * 3270 * None of the other registers share their location, so treat them as 3271 * if they were 64bit. 3272 */ 3273 #define DBG_BCR_BVR_WCR_WVR(n) \ 3274 /* DBGBVRn */ \ 3275 { AA32(LO), Op1( 0), CRn( 0), CRm((n)), Op2( 4), trap_bvr, NULL, n }, \ 3276 /* DBGBCRn */ \ 3277 { Op1( 0), CRn( 0), CRm((n)), Op2( 5), trap_bcr, NULL, n }, \ 3278 /* DBGWVRn */ \ 3279 { Op1( 0), CRn( 0), CRm((n)), Op2( 6), trap_wvr, NULL, n }, \ 3280 /* DBGWCRn */ \ 3281 { Op1( 0), CRn( 0), CRm((n)), Op2( 7), trap_wcr, NULL, n } 3282 3283 #define DBGBXVR(n) \ 3284 { AA32(HI), Op1( 0), CRn( 1), CRm((n)), Op2( 1), trap_bvr, NULL, n } 3285 3286 /* 3287 * Trapped cp14 registers. We generally ignore most of the external 3288 * debug, on the principle that they don't really make sense to a 3289 * guest. Revisit this one day, would this principle change. 3290 */ 3291 static const struct sys_reg_desc cp14_regs[] = { 3292 /* DBGDIDR */ 3293 { Op1( 0), CRn( 0), CRm( 0), Op2( 0), trap_dbgdidr }, 3294 /* DBGDTRRXext */ 3295 { Op1( 0), CRn( 0), CRm( 0), Op2( 2), trap_raz_wi }, 3296 3297 DBG_BCR_BVR_WCR_WVR(0), 3298 /* DBGDSCRint */ 3299 { Op1( 0), CRn( 0), CRm( 1), Op2( 0), trap_raz_wi }, 3300 DBG_BCR_BVR_WCR_WVR(1), 3301 /* DBGDCCINT */ 3302 { Op1( 0), CRn( 0), CRm( 2), Op2( 0), trap_debug_regs, NULL, MDCCINT_EL1 }, 3303 /* DBGDSCRext */ 3304 { Op1( 0), CRn( 0), CRm( 2), Op2( 2), trap_debug_regs, NULL, MDSCR_EL1 }, 3305 DBG_BCR_BVR_WCR_WVR(2), 3306 /* DBGDTR[RT]Xint */ 3307 { Op1( 0), CRn( 0), CRm( 3), Op2( 0), trap_raz_wi }, 3308 /* DBGDTR[RT]Xext */ 3309 { Op1( 0), CRn( 0), CRm( 3), Op2( 2), trap_raz_wi }, 3310 DBG_BCR_BVR_WCR_WVR(3), 3311 DBG_BCR_BVR_WCR_WVR(4), 3312 DBG_BCR_BVR_WCR_WVR(5), 3313 /* DBGWFAR */ 3314 { Op1( 0), CRn( 0), CRm( 6), Op2( 0), trap_raz_wi }, 3315 /* DBGOSECCR */ 3316 { Op1( 0), CRn( 0), CRm( 6), Op2( 2), trap_raz_wi }, 3317 DBG_BCR_BVR_WCR_WVR(6), 3318 /* DBGVCR */ 3319 { Op1( 0), CRn( 0), CRm( 7), Op2( 0), trap_debug_regs, NULL, DBGVCR32_EL2 }, 3320 DBG_BCR_BVR_WCR_WVR(7), 3321 DBG_BCR_BVR_WCR_WVR(8), 3322 DBG_BCR_BVR_WCR_WVR(9), 3323 DBG_BCR_BVR_WCR_WVR(10), 3324 DBG_BCR_BVR_WCR_WVR(11), 3325 DBG_BCR_BVR_WCR_WVR(12), 3326 DBG_BCR_BVR_WCR_WVR(13), 3327 DBG_BCR_BVR_WCR_WVR(14), 3328 DBG_BCR_BVR_WCR_WVR(15), 3329 3330 /* DBGDRAR (32bit) */ 3331 { Op1( 0), CRn( 1), CRm( 0), Op2( 0), trap_raz_wi }, 3332 3333 DBGBXVR(0), 3334 /* DBGOSLAR */ 3335 { Op1( 0), CRn( 1), CRm( 0), Op2( 4), trap_oslar_el1 }, 3336 DBGBXVR(1), 3337 /* DBGOSLSR */ 3338 { Op1( 0), CRn( 1), CRm( 1), Op2( 4), trap_oslsr_el1, NULL, OSLSR_EL1 }, 3339 DBGBXVR(2), 3340 DBGBXVR(3), 3341 /* DBGOSDLR */ 3342 { Op1( 0), CRn( 1), CRm( 3), Op2( 4), trap_raz_wi }, 3343 DBGBXVR(4), 3344 /* DBGPRCR */ 3345 { Op1( 0), CRn( 1), CRm( 4), Op2( 4), trap_raz_wi }, 3346 DBGBXVR(5), 3347 DBGBXVR(6), 3348 DBGBXVR(7), 3349 DBGBXVR(8), 3350 DBGBXVR(9), 3351 DBGBXVR(10), 3352 DBGBXVR(11), 3353 DBGBXVR(12), 3354 DBGBXVR(13), 3355 DBGBXVR(14), 3356 DBGBXVR(15), 3357 3358 /* DBGDSAR (32bit) */ 3359 { Op1( 0), CRn( 2), CRm( 0), Op2( 0), trap_raz_wi }, 3360 3361 /* DBGDEVID2 */ 3362 { Op1( 0), CRn( 7), CRm( 0), Op2( 7), trap_raz_wi }, 3363 /* DBGDEVID1 */ 3364 { Op1( 0), CRn( 7), CRm( 1), Op2( 7), trap_raz_wi }, 3365 /* DBGDEVID */ 3366 { Op1( 0), CRn( 7), CRm( 2), Op2( 7), trap_raz_wi }, 3367 /* DBGCLAIMSET */ 3368 { Op1( 0), CRn( 7), CRm( 8), Op2( 6), trap_raz_wi }, 3369 /* DBGCLAIMCLR */ 3370 { Op1( 0), CRn( 7), CRm( 9), Op2( 6), trap_raz_wi }, 3371 /* DBGAUTHSTATUS */ 3372 { Op1( 0), CRn( 7), CRm(14), Op2( 6), trap_dbgauthstatus_el1 }, 3373 }; 3374 3375 /* Trapped cp14 64bit registers */ 3376 static const struct sys_reg_desc cp14_64_regs[] = { 3377 /* DBGDRAR (64bit) */ 3378 { Op1( 0), CRm( 1), .access = trap_raz_wi }, 3379 3380 /* DBGDSAR (64bit) */ 3381 { Op1( 0), CRm( 2), .access = trap_raz_wi }, 3382 }; 3383 3384 #define CP15_PMU_SYS_REG(_map, _Op1, _CRn, _CRm, _Op2) \ 3385 AA32(_map), \ 3386 Op1(_Op1), CRn(_CRn), CRm(_CRm), Op2(_Op2), \ 3387 .visibility = pmu_visibility 3388 3389 /* Macro to expand the PMEVCNTRn register */ 3390 #define PMU_PMEVCNTR(n) \ 3391 { CP15_PMU_SYS_REG(DIRECT, 0, 0b1110, \ 3392 (0b1000 | (((n) >> 3) & 0x3)), ((n) & 0x7)), \ 3393 .access = access_pmu_evcntr } 3394 3395 /* Macro to expand the PMEVTYPERn register */ 3396 #define PMU_PMEVTYPER(n) \ 3397 { CP15_PMU_SYS_REG(DIRECT, 0, 0b1110, \ 3398 (0b1100 | (((n) >> 3) & 0x3)), ((n) & 0x7)), \ 3399 .access = access_pmu_evtyper } 3400 /* 3401 * Trapped cp15 registers. TTBR0/TTBR1 get a double encoding, 3402 * depending on the way they are accessed (as a 32bit or a 64bit 3403 * register). 3404 */ 3405 static const struct sys_reg_desc cp15_regs[] = { 3406 { Op1( 0), CRn( 0), CRm( 0), Op2( 1), access_ctr }, 3407 { Op1( 0), CRn( 1), CRm( 0), Op2( 0), access_vm_reg, NULL, SCTLR_EL1 }, 3408 /* ACTLR */ 3409 { AA32(LO), Op1( 0), CRn( 1), CRm( 0), Op2( 1), access_actlr, NULL, ACTLR_EL1 }, 3410 /* ACTLR2 */ 3411 { AA32(HI), Op1( 0), CRn( 1), CRm( 0), Op2( 3), access_actlr, NULL, ACTLR_EL1 }, 3412 { Op1( 0), CRn( 2), CRm( 0), Op2( 0), access_vm_reg, NULL, TTBR0_EL1 }, 3413 { Op1( 0), CRn( 2), CRm( 0), Op2( 1), access_vm_reg, NULL, TTBR1_EL1 }, 3414 /* TTBCR */ 3415 { AA32(LO), Op1( 0), CRn( 2), CRm( 0), Op2( 2), access_vm_reg, NULL, TCR_EL1 }, 3416 /* TTBCR2 */ 3417 { AA32(HI), Op1( 0), CRn( 2), CRm( 0), Op2( 3), access_vm_reg, NULL, TCR_EL1 }, 3418 { Op1( 0), CRn( 3), CRm( 0), Op2( 0), access_vm_reg, NULL, DACR32_EL2 }, 3419 /* DFSR */ 3420 { Op1( 0), CRn( 5), CRm( 0), Op2( 0), access_vm_reg, NULL, ESR_EL1 }, 3421 { Op1( 0), CRn( 5), CRm( 0), Op2( 1), access_vm_reg, NULL, IFSR32_EL2 }, 3422 /* ADFSR */ 3423 { Op1( 0), CRn( 5), CRm( 1), Op2( 0), access_vm_reg, NULL, AFSR0_EL1 }, 3424 /* AIFSR */ 3425 { Op1( 0), CRn( 5), CRm( 1), Op2( 1), access_vm_reg, NULL, AFSR1_EL1 }, 3426 /* DFAR */ 3427 { AA32(LO), Op1( 0), CRn( 6), CRm( 0), Op2( 0), access_vm_reg, NULL, FAR_EL1 }, 3428 /* IFAR */ 3429 { AA32(HI), Op1( 0), CRn( 6), CRm( 0), Op2( 2), access_vm_reg, NULL, FAR_EL1 }, 3430 3431 /* 3432 * DC{C,I,CI}SW operations: 3433 */ 3434 { Op1( 0), CRn( 7), CRm( 6), Op2( 2), access_dcsw }, 3435 { Op1( 0), CRn( 7), CRm(10), Op2( 2), access_dcsw }, 3436 { Op1( 0), CRn( 7), CRm(14), Op2( 2), access_dcsw }, 3437 3438 /* PMU */ 3439 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 0), .access = access_pmcr }, 3440 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 1), .access = access_pmcnten }, 3441 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 2), .access = access_pmcnten }, 3442 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 3), .access = access_pmovs }, 3443 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 4), .access = access_pmswinc }, 3444 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 5), .access = access_pmselr }, 3445 { CP15_PMU_SYS_REG(LO, 0, 9, 12, 6), .access = access_pmceid }, 3446 { CP15_PMU_SYS_REG(LO, 0, 9, 12, 7), .access = access_pmceid }, 3447 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 13, 0), .access = access_pmu_evcntr }, 3448 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 13, 1), .access = access_pmu_evtyper }, 3449 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 13, 2), .access = access_pmu_evcntr }, 3450 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 0), .access = access_pmuserenr }, 3451 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 1), .access = access_pminten }, 3452 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 2), .access = access_pminten }, 3453 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 3), .access = access_pmovs }, 3454 { CP15_PMU_SYS_REG(HI, 0, 9, 14, 4), .access = access_pmceid }, 3455 { CP15_PMU_SYS_REG(HI, 0, 9, 14, 5), .access = access_pmceid }, 3456 /* PMMIR */ 3457 { CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 6), .access = trap_raz_wi }, 3458 3459 /* PRRR/MAIR0 */ 3460 { AA32(LO), Op1( 0), CRn(10), CRm( 2), Op2( 0), access_vm_reg, NULL, MAIR_EL1 }, 3461 /* NMRR/MAIR1 */ 3462 { AA32(HI), Op1( 0), CRn(10), CRm( 2), Op2( 1), access_vm_reg, NULL, MAIR_EL1 }, 3463 /* AMAIR0 */ 3464 { AA32(LO), Op1( 0), CRn(10), CRm( 3), Op2( 0), access_vm_reg, NULL, AMAIR_EL1 }, 3465 /* AMAIR1 */ 3466 { AA32(HI), Op1( 0), CRn(10), CRm( 3), Op2( 1), access_vm_reg, NULL, AMAIR_EL1 }, 3467 3468 /* ICC_SRE */ 3469 { Op1( 0), CRn(12), CRm(12), Op2( 5), access_gic_sre }, 3470 3471 { Op1( 0), CRn(13), CRm( 0), Op2( 1), access_vm_reg, NULL, CONTEXTIDR_EL1 }, 3472 3473 /* Arch Tmers */ 3474 { SYS_DESC(SYS_AARCH32_CNTP_TVAL), access_arch_timer }, 3475 { SYS_DESC(SYS_AARCH32_CNTP_CTL), access_arch_timer }, 3476 3477 /* PMEVCNTRn */ 3478 PMU_PMEVCNTR(0), 3479 PMU_PMEVCNTR(1), 3480 PMU_PMEVCNTR(2), 3481 PMU_PMEVCNTR(3), 3482 PMU_PMEVCNTR(4), 3483 PMU_PMEVCNTR(5), 3484 PMU_PMEVCNTR(6), 3485 PMU_PMEVCNTR(7), 3486 PMU_PMEVCNTR(8), 3487 PMU_PMEVCNTR(9), 3488 PMU_PMEVCNTR(10), 3489 PMU_PMEVCNTR(11), 3490 PMU_PMEVCNTR(12), 3491 PMU_PMEVCNTR(13), 3492 PMU_PMEVCNTR(14), 3493 PMU_PMEVCNTR(15), 3494 PMU_PMEVCNTR(16), 3495 PMU_PMEVCNTR(17), 3496 PMU_PMEVCNTR(18), 3497 PMU_PMEVCNTR(19), 3498 PMU_PMEVCNTR(20), 3499 PMU_PMEVCNTR(21), 3500 PMU_PMEVCNTR(22), 3501 PMU_PMEVCNTR(23), 3502 PMU_PMEVCNTR(24), 3503 PMU_PMEVCNTR(25), 3504 PMU_PMEVCNTR(26), 3505 PMU_PMEVCNTR(27), 3506 PMU_PMEVCNTR(28), 3507 PMU_PMEVCNTR(29), 3508 PMU_PMEVCNTR(30), 3509 /* PMEVTYPERn */ 3510 PMU_PMEVTYPER(0), 3511 PMU_PMEVTYPER(1), 3512 PMU_PMEVTYPER(2), 3513 PMU_PMEVTYPER(3), 3514 PMU_PMEVTYPER(4), 3515 PMU_PMEVTYPER(5), 3516 PMU_PMEVTYPER(6), 3517 PMU_PMEVTYPER(7), 3518 PMU_PMEVTYPER(8), 3519 PMU_PMEVTYPER(9), 3520 PMU_PMEVTYPER(10), 3521 PMU_PMEVTYPER(11), 3522 PMU_PMEVTYPER(12), 3523 PMU_PMEVTYPER(13), 3524 PMU_PMEVTYPER(14), 3525 PMU_PMEVTYPER(15), 3526 PMU_PMEVTYPER(16), 3527 PMU_PMEVTYPER(17), 3528 PMU_PMEVTYPER(18), 3529 PMU_PMEVTYPER(19), 3530 PMU_PMEVTYPER(20), 3531 PMU_PMEVTYPER(21), 3532 PMU_PMEVTYPER(22), 3533 PMU_PMEVTYPER(23), 3534 PMU_PMEVTYPER(24), 3535 PMU_PMEVTYPER(25), 3536 PMU_PMEVTYPER(26), 3537 PMU_PMEVTYPER(27), 3538 PMU_PMEVTYPER(28), 3539 PMU_PMEVTYPER(29), 3540 PMU_PMEVTYPER(30), 3541 /* PMCCFILTR */ 3542 { CP15_PMU_SYS_REG(DIRECT, 0, 14, 15, 7), .access = access_pmu_evtyper }, 3543 3544 { Op1(1), CRn( 0), CRm( 0), Op2(0), access_ccsidr }, 3545 { Op1(1), CRn( 0), CRm( 0), Op2(1), access_clidr }, 3546 3547 /* CCSIDR2 */ 3548 { Op1(1), CRn( 0), CRm( 0), Op2(2), undef_access }, 3549 3550 { Op1(2), CRn( 0), CRm( 0), Op2(0), access_csselr, NULL, CSSELR_EL1 }, 3551 }; 3552 3553 static const struct sys_reg_desc cp15_64_regs[] = { 3554 { Op1( 0), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, TTBR0_EL1 }, 3555 { CP15_PMU_SYS_REG(DIRECT, 0, 0, 9, 0), .access = access_pmu_evcntr }, 3556 { Op1( 0), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_SGI1R */ 3557 { SYS_DESC(SYS_AARCH32_CNTPCT), access_arch_timer }, 3558 { Op1( 1), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, TTBR1_EL1 }, 3559 { Op1( 1), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_ASGI1R */ 3560 { Op1( 2), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_SGI0R */ 3561 { SYS_DESC(SYS_AARCH32_CNTP_CVAL), access_arch_timer }, 3562 { SYS_DESC(SYS_AARCH32_CNTPCTSS), access_arch_timer }, 3563 }; 3564 3565 static bool check_sysreg_table(const struct sys_reg_desc *table, unsigned int n, 3566 bool is_32) 3567 { 3568 unsigned int i; 3569 3570 for (i = 0; i < n; i++) { 3571 if (!is_32 && table[i].reg && !table[i].reset) { 3572 kvm_err("sys_reg table %pS entry %d (%s) lacks reset\n", 3573 &table[i], i, table[i].name); 3574 return false; 3575 } 3576 3577 if (i && cmp_sys_reg(&table[i-1], &table[i]) >= 0) { 3578 kvm_err("sys_reg table %pS entry %d (%s -> %s) out of order\n", 3579 &table[i], i, table[i - 1].name, table[i].name); 3580 return false; 3581 } 3582 } 3583 3584 return true; 3585 } 3586 3587 int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu) 3588 { 3589 kvm_inject_undefined(vcpu); 3590 return 1; 3591 } 3592 3593 static void perform_access(struct kvm_vcpu *vcpu, 3594 struct sys_reg_params *params, 3595 const struct sys_reg_desc *r) 3596 { 3597 trace_kvm_sys_access(*vcpu_pc(vcpu), params, r); 3598 3599 /* Check for regs disabled by runtime config */ 3600 if (sysreg_hidden(vcpu, r)) { 3601 kvm_inject_undefined(vcpu); 3602 return; 3603 } 3604 3605 /* 3606 * Not having an accessor means that we have configured a trap 3607 * that we don't know how to handle. This certainly qualifies 3608 * as a gross bug that should be fixed right away. 3609 */ 3610 BUG_ON(!r->access); 3611 3612 /* Skip instruction if instructed so */ 3613 if (likely(r->access(vcpu, params, r))) 3614 kvm_incr_pc(vcpu); 3615 } 3616 3617 /* 3618 * emulate_cp -- tries to match a sys_reg access in a handling table, and 3619 * call the corresponding trap handler. 3620 * 3621 * @params: pointer to the descriptor of the access 3622 * @table: array of trap descriptors 3623 * @num: size of the trap descriptor array 3624 * 3625 * Return true if the access has been handled, false if not. 3626 */ 3627 static bool emulate_cp(struct kvm_vcpu *vcpu, 3628 struct sys_reg_params *params, 3629 const struct sys_reg_desc *table, 3630 size_t num) 3631 { 3632 const struct sys_reg_desc *r; 3633 3634 if (!table) 3635 return false; /* Not handled */ 3636 3637 r = find_reg(params, table, num); 3638 3639 if (r) { 3640 perform_access(vcpu, params, r); 3641 return true; 3642 } 3643 3644 /* Not handled */ 3645 return false; 3646 } 3647 3648 static void unhandled_cp_access(struct kvm_vcpu *vcpu, 3649 struct sys_reg_params *params) 3650 { 3651 u8 esr_ec = kvm_vcpu_trap_get_class(vcpu); 3652 int cp = -1; 3653 3654 switch (esr_ec) { 3655 case ESR_ELx_EC_CP15_32: 3656 case ESR_ELx_EC_CP15_64: 3657 cp = 15; 3658 break; 3659 case ESR_ELx_EC_CP14_MR: 3660 case ESR_ELx_EC_CP14_64: 3661 cp = 14; 3662 break; 3663 default: 3664 WARN_ON(1); 3665 } 3666 3667 print_sys_reg_msg(params, 3668 "Unsupported guest CP%d access at: %08lx [%08lx]\n", 3669 cp, *vcpu_pc(vcpu), *vcpu_cpsr(vcpu)); 3670 kvm_inject_undefined(vcpu); 3671 } 3672 3673 /** 3674 * kvm_handle_cp_64 -- handles a mrrc/mcrr trap on a guest CP14/CP15 access 3675 * @vcpu: The VCPU pointer 3676 * @global: &struct sys_reg_desc 3677 * @nr_global: size of the @global array 3678 */ 3679 static int kvm_handle_cp_64(struct kvm_vcpu *vcpu, 3680 const struct sys_reg_desc *global, 3681 size_t nr_global) 3682 { 3683 struct sys_reg_params params; 3684 u64 esr = kvm_vcpu_get_esr(vcpu); 3685 int Rt = kvm_vcpu_sys_get_rt(vcpu); 3686 int Rt2 = (esr >> 10) & 0x1f; 3687 3688 params.CRm = (esr >> 1) & 0xf; 3689 params.is_write = ((esr & 1) == 0); 3690 3691 params.Op0 = 0; 3692 params.Op1 = (esr >> 16) & 0xf; 3693 params.Op2 = 0; 3694 params.CRn = 0; 3695 3696 /* 3697 * Make a 64-bit value out of Rt and Rt2. As we use the same trap 3698 * backends between AArch32 and AArch64, we get away with it. 3699 */ 3700 if (params.is_write) { 3701 params.regval = vcpu_get_reg(vcpu, Rt) & 0xffffffff; 3702 params.regval |= vcpu_get_reg(vcpu, Rt2) << 32; 3703 } 3704 3705 /* 3706 * If the table contains a handler, handle the 3707 * potential register operation in the case of a read and return 3708 * with success. 3709 */ 3710 if (emulate_cp(vcpu, ¶ms, global, nr_global)) { 3711 /* Split up the value between registers for the read side */ 3712 if (!params.is_write) { 3713 vcpu_set_reg(vcpu, Rt, lower_32_bits(params.regval)); 3714 vcpu_set_reg(vcpu, Rt2, upper_32_bits(params.regval)); 3715 } 3716 3717 return 1; 3718 } 3719 3720 unhandled_cp_access(vcpu, ¶ms); 3721 return 1; 3722 } 3723 3724 static bool emulate_sys_reg(struct kvm_vcpu *vcpu, struct sys_reg_params *params); 3725 3726 /* 3727 * The CP10 ID registers are architecturally mapped to AArch64 feature 3728 * registers. Abuse that fact so we can rely on the AArch64 handler for accesses 3729 * from AArch32. 3730 */ 3731 static bool kvm_esr_cp10_id_to_sys64(u64 esr, struct sys_reg_params *params) 3732 { 3733 u8 reg_id = (esr >> 10) & 0xf; 3734 bool valid; 3735 3736 params->is_write = ((esr & 1) == 0); 3737 params->Op0 = 3; 3738 params->Op1 = 0; 3739 params->CRn = 0; 3740 params->CRm = 3; 3741 3742 /* CP10 ID registers are read-only */ 3743 valid = !params->is_write; 3744 3745 switch (reg_id) { 3746 /* MVFR0 */ 3747 case 0b0111: 3748 params->Op2 = 0; 3749 break; 3750 /* MVFR1 */ 3751 case 0b0110: 3752 params->Op2 = 1; 3753 break; 3754 /* MVFR2 */ 3755 case 0b0101: 3756 params->Op2 = 2; 3757 break; 3758 default: 3759 valid = false; 3760 } 3761 3762 if (valid) 3763 return true; 3764 3765 kvm_pr_unimpl("Unhandled cp10 register %s: %u\n", 3766 params->is_write ? "write" : "read", reg_id); 3767 return false; 3768 } 3769 3770 /** 3771 * kvm_handle_cp10_id() - Handles a VMRS trap on guest access to a 'Media and 3772 * VFP Register' from AArch32. 3773 * @vcpu: The vCPU pointer 3774 * 3775 * MVFR{0-2} are architecturally mapped to the AArch64 MVFR{0-2}_EL1 registers. 3776 * Work out the correct AArch64 system register encoding and reroute to the 3777 * AArch64 system register emulation. 3778 */ 3779 int kvm_handle_cp10_id(struct kvm_vcpu *vcpu) 3780 { 3781 int Rt = kvm_vcpu_sys_get_rt(vcpu); 3782 u64 esr = kvm_vcpu_get_esr(vcpu); 3783 struct sys_reg_params params; 3784 3785 /* UNDEF on any unhandled register access */ 3786 if (!kvm_esr_cp10_id_to_sys64(esr, ¶ms)) { 3787 kvm_inject_undefined(vcpu); 3788 return 1; 3789 } 3790 3791 if (emulate_sys_reg(vcpu, ¶ms)) 3792 vcpu_set_reg(vcpu, Rt, params.regval); 3793 3794 return 1; 3795 } 3796 3797 /** 3798 * kvm_emulate_cp15_id_reg() - Handles an MRC trap on a guest CP15 access where 3799 * CRn=0, which corresponds to the AArch32 feature 3800 * registers. 3801 * @vcpu: the vCPU pointer 3802 * @params: the system register access parameters. 3803 * 3804 * Our cp15 system register tables do not enumerate the AArch32 feature 3805 * registers. Conveniently, our AArch64 table does, and the AArch32 system 3806 * register encoding can be trivially remapped into the AArch64 for the feature 3807 * registers: Append op0=3, leaving op1, CRn, CRm, and op2 the same. 3808 * 3809 * According to DDI0487G.b G7.3.1, paragraph "Behavior of VMSAv8-32 32-bit 3810 * System registers with (coproc=0b1111, CRn==c0)", read accesses from this 3811 * range are either UNKNOWN or RES0. Rerouting remains architectural as we 3812 * treat undefined registers in this range as RAZ. 3813 */ 3814 static int kvm_emulate_cp15_id_reg(struct kvm_vcpu *vcpu, 3815 struct sys_reg_params *params) 3816 { 3817 int Rt = kvm_vcpu_sys_get_rt(vcpu); 3818 3819 /* Treat impossible writes to RO registers as UNDEFINED */ 3820 if (params->is_write) { 3821 unhandled_cp_access(vcpu, params); 3822 return 1; 3823 } 3824 3825 params->Op0 = 3; 3826 3827 /* 3828 * All registers where CRm > 3 are known to be UNKNOWN/RAZ from AArch32. 3829 * Avoid conflicting with future expansion of AArch64 feature registers 3830 * and simply treat them as RAZ here. 3831 */ 3832 if (params->CRm > 3) 3833 params->regval = 0; 3834 else if (!emulate_sys_reg(vcpu, params)) 3835 return 1; 3836 3837 vcpu_set_reg(vcpu, Rt, params->regval); 3838 return 1; 3839 } 3840 3841 /** 3842 * kvm_handle_cp_32 -- handles a mrc/mcr trap on a guest CP14/CP15 access 3843 * @vcpu: The VCPU pointer 3844 * @params: &struct sys_reg_params 3845 * @global: &struct sys_reg_desc 3846 * @nr_global: size of the @global array 3847 */ 3848 static int kvm_handle_cp_32(struct kvm_vcpu *vcpu, 3849 struct sys_reg_params *params, 3850 const struct sys_reg_desc *global, 3851 size_t nr_global) 3852 { 3853 int Rt = kvm_vcpu_sys_get_rt(vcpu); 3854 3855 params->regval = vcpu_get_reg(vcpu, Rt); 3856 3857 if (emulate_cp(vcpu, params, global, nr_global)) { 3858 if (!params->is_write) 3859 vcpu_set_reg(vcpu, Rt, params->regval); 3860 return 1; 3861 } 3862 3863 unhandled_cp_access(vcpu, params); 3864 return 1; 3865 } 3866 3867 int kvm_handle_cp15_64(struct kvm_vcpu *vcpu) 3868 { 3869 return kvm_handle_cp_64(vcpu, cp15_64_regs, ARRAY_SIZE(cp15_64_regs)); 3870 } 3871 3872 int kvm_handle_cp15_32(struct kvm_vcpu *vcpu) 3873 { 3874 struct sys_reg_params params; 3875 3876 params = esr_cp1x_32_to_params(kvm_vcpu_get_esr(vcpu)); 3877 3878 /* 3879 * Certain AArch32 ID registers are handled by rerouting to the AArch64 3880 * system register table. Registers in the ID range where CRm=0 are 3881 * excluded from this scheme as they do not trivially map into AArch64 3882 * system register encodings. 3883 */ 3884 if (params.Op1 == 0 && params.CRn == 0 && params.CRm) 3885 return kvm_emulate_cp15_id_reg(vcpu, ¶ms); 3886 3887 return kvm_handle_cp_32(vcpu, ¶ms, cp15_regs, ARRAY_SIZE(cp15_regs)); 3888 } 3889 3890 int kvm_handle_cp14_64(struct kvm_vcpu *vcpu) 3891 { 3892 return kvm_handle_cp_64(vcpu, cp14_64_regs, ARRAY_SIZE(cp14_64_regs)); 3893 } 3894 3895 int kvm_handle_cp14_32(struct kvm_vcpu *vcpu) 3896 { 3897 struct sys_reg_params params; 3898 3899 params = esr_cp1x_32_to_params(kvm_vcpu_get_esr(vcpu)); 3900 3901 return kvm_handle_cp_32(vcpu, ¶ms, cp14_regs, ARRAY_SIZE(cp14_regs)); 3902 } 3903 3904 /** 3905 * emulate_sys_reg - Emulate a guest access to an AArch64 system register 3906 * @vcpu: The VCPU pointer 3907 * @params: Decoded system register parameters 3908 * 3909 * Return: true if the system register access was successful, false otherwise. 3910 */ 3911 static bool emulate_sys_reg(struct kvm_vcpu *vcpu, 3912 struct sys_reg_params *params) 3913 { 3914 const struct sys_reg_desc *r; 3915 3916 r = find_reg(params, sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); 3917 if (likely(r)) { 3918 perform_access(vcpu, params, r); 3919 return true; 3920 } 3921 3922 print_sys_reg_msg(params, 3923 "Unsupported guest sys_reg access at: %lx [%08lx]\n", 3924 *vcpu_pc(vcpu), *vcpu_cpsr(vcpu)); 3925 kvm_inject_undefined(vcpu); 3926 3927 return false; 3928 } 3929 3930 static const struct sys_reg_desc *idregs_debug_find(struct kvm *kvm, u8 pos) 3931 { 3932 unsigned long i, idreg_idx = 0; 3933 3934 for (i = 0; i < ARRAY_SIZE(sys_reg_descs); i++) { 3935 const struct sys_reg_desc *r = &sys_reg_descs[i]; 3936 3937 if (!is_vm_ftr_id_reg(reg_to_encoding(r))) 3938 continue; 3939 3940 if (idreg_idx == pos) 3941 return r; 3942 3943 idreg_idx++; 3944 } 3945 3946 return NULL; 3947 } 3948 3949 static void *idregs_debug_start(struct seq_file *s, loff_t *pos) 3950 { 3951 struct kvm *kvm = s->private; 3952 u8 *iter; 3953 3954 mutex_lock(&kvm->arch.config_lock); 3955 3956 iter = &kvm->arch.idreg_debugfs_iter; 3957 if (test_bit(KVM_ARCH_FLAG_ID_REGS_INITIALIZED, &kvm->arch.flags) && 3958 *iter == (u8)~0) { 3959 *iter = *pos; 3960 if (!idregs_debug_find(kvm, *iter)) 3961 iter = NULL; 3962 } else { 3963 iter = ERR_PTR(-EBUSY); 3964 } 3965 3966 mutex_unlock(&kvm->arch.config_lock); 3967 3968 return iter; 3969 } 3970 3971 static void *idregs_debug_next(struct seq_file *s, void *v, loff_t *pos) 3972 { 3973 struct kvm *kvm = s->private; 3974 3975 (*pos)++; 3976 3977 if (idregs_debug_find(kvm, kvm->arch.idreg_debugfs_iter + 1)) { 3978 kvm->arch.idreg_debugfs_iter++; 3979 3980 return &kvm->arch.idreg_debugfs_iter; 3981 } 3982 3983 return NULL; 3984 } 3985 3986 static void idregs_debug_stop(struct seq_file *s, void *v) 3987 { 3988 struct kvm *kvm = s->private; 3989 3990 if (IS_ERR(v)) 3991 return; 3992 3993 mutex_lock(&kvm->arch.config_lock); 3994 3995 kvm->arch.idreg_debugfs_iter = ~0; 3996 3997 mutex_unlock(&kvm->arch.config_lock); 3998 } 3999 4000 static int idregs_debug_show(struct seq_file *s, void *v) 4001 { 4002 const struct sys_reg_desc *desc; 4003 struct kvm *kvm = s->private; 4004 4005 desc = idregs_debug_find(kvm, kvm->arch.idreg_debugfs_iter); 4006 4007 if (!desc->name) 4008 return 0; 4009 4010 seq_printf(s, "%20s:\t%016llx\n", 4011 desc->name, kvm_read_vm_id_reg(kvm, reg_to_encoding(desc))); 4012 4013 return 0; 4014 } 4015 4016 static const struct seq_operations idregs_debug_sops = { 4017 .start = idregs_debug_start, 4018 .next = idregs_debug_next, 4019 .stop = idregs_debug_stop, 4020 .show = idregs_debug_show, 4021 }; 4022 4023 DEFINE_SEQ_ATTRIBUTE(idregs_debug); 4024 4025 void kvm_sys_regs_create_debugfs(struct kvm *kvm) 4026 { 4027 kvm->arch.idreg_debugfs_iter = ~0; 4028 4029 debugfs_create_file("idregs", 0444, kvm->debugfs_dentry, kvm, 4030 &idregs_debug_fops); 4031 } 4032 4033 static void reset_vm_ftr_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *reg) 4034 { 4035 u32 id = reg_to_encoding(reg); 4036 struct kvm *kvm = vcpu->kvm; 4037 4038 if (test_bit(KVM_ARCH_FLAG_ID_REGS_INITIALIZED, &kvm->arch.flags)) 4039 return; 4040 4041 kvm_set_vm_id_reg(kvm, id, reg->reset(vcpu, reg)); 4042 } 4043 4044 static void reset_vcpu_ftr_id_reg(struct kvm_vcpu *vcpu, 4045 const struct sys_reg_desc *reg) 4046 { 4047 if (kvm_vcpu_initialized(vcpu)) 4048 return; 4049 4050 reg->reset(vcpu, reg); 4051 } 4052 4053 /** 4054 * kvm_reset_sys_regs - sets system registers to reset value 4055 * @vcpu: The VCPU pointer 4056 * 4057 * This function finds the right table above and sets the registers on the 4058 * virtual CPU struct to their architecturally defined reset values. 4059 */ 4060 void kvm_reset_sys_regs(struct kvm_vcpu *vcpu) 4061 { 4062 struct kvm *kvm = vcpu->kvm; 4063 unsigned long i; 4064 4065 for (i = 0; i < ARRAY_SIZE(sys_reg_descs); i++) { 4066 const struct sys_reg_desc *r = &sys_reg_descs[i]; 4067 4068 if (!r->reset) 4069 continue; 4070 4071 if (is_vm_ftr_id_reg(reg_to_encoding(r))) 4072 reset_vm_ftr_id_reg(vcpu, r); 4073 else if (is_vcpu_ftr_id_reg(reg_to_encoding(r))) 4074 reset_vcpu_ftr_id_reg(vcpu, r); 4075 else 4076 r->reset(vcpu, r); 4077 } 4078 4079 set_bit(KVM_ARCH_FLAG_ID_REGS_INITIALIZED, &kvm->arch.flags); 4080 } 4081 4082 /** 4083 * kvm_handle_sys_reg -- handles a system instruction or mrs/msr instruction 4084 * trap on a guest execution 4085 * @vcpu: The VCPU pointer 4086 */ 4087 int kvm_handle_sys_reg(struct kvm_vcpu *vcpu) 4088 { 4089 const struct sys_reg_desc *desc = NULL; 4090 struct sys_reg_params params; 4091 unsigned long esr = kvm_vcpu_get_esr(vcpu); 4092 int Rt = kvm_vcpu_sys_get_rt(vcpu); 4093 int sr_idx; 4094 4095 trace_kvm_handle_sys_reg(esr); 4096 4097 if (triage_sysreg_trap(vcpu, &sr_idx)) 4098 return 1; 4099 4100 params = esr_sys64_to_params(esr); 4101 params.regval = vcpu_get_reg(vcpu, Rt); 4102 4103 /* System registers have Op0=={2,3}, as per DDI487 J.a C5.1.2 */ 4104 if (params.Op0 == 2 || params.Op0 == 3) 4105 desc = &sys_reg_descs[sr_idx]; 4106 else 4107 desc = &sys_insn_descs[sr_idx]; 4108 4109 perform_access(vcpu, ¶ms, desc); 4110 4111 /* Read from system register? */ 4112 if (!params.is_write && 4113 (params.Op0 == 2 || params.Op0 == 3)) 4114 vcpu_set_reg(vcpu, Rt, params.regval); 4115 4116 return 1; 4117 } 4118 4119 /****************************************************************************** 4120 * Userspace API 4121 *****************************************************************************/ 4122 4123 static bool index_to_params(u64 id, struct sys_reg_params *params) 4124 { 4125 switch (id & KVM_REG_SIZE_MASK) { 4126 case KVM_REG_SIZE_U64: 4127 /* Any unused index bits means it's not valid. */ 4128 if (id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK 4129 | KVM_REG_ARM_COPROC_MASK 4130 | KVM_REG_ARM64_SYSREG_OP0_MASK 4131 | KVM_REG_ARM64_SYSREG_OP1_MASK 4132 | KVM_REG_ARM64_SYSREG_CRN_MASK 4133 | KVM_REG_ARM64_SYSREG_CRM_MASK 4134 | KVM_REG_ARM64_SYSREG_OP2_MASK)) 4135 return false; 4136 params->Op0 = ((id & KVM_REG_ARM64_SYSREG_OP0_MASK) 4137 >> KVM_REG_ARM64_SYSREG_OP0_SHIFT); 4138 params->Op1 = ((id & KVM_REG_ARM64_SYSREG_OP1_MASK) 4139 >> KVM_REG_ARM64_SYSREG_OP1_SHIFT); 4140 params->CRn = ((id & KVM_REG_ARM64_SYSREG_CRN_MASK) 4141 >> KVM_REG_ARM64_SYSREG_CRN_SHIFT); 4142 params->CRm = ((id & KVM_REG_ARM64_SYSREG_CRM_MASK) 4143 >> KVM_REG_ARM64_SYSREG_CRM_SHIFT); 4144 params->Op2 = ((id & KVM_REG_ARM64_SYSREG_OP2_MASK) 4145 >> KVM_REG_ARM64_SYSREG_OP2_SHIFT); 4146 return true; 4147 default: 4148 return false; 4149 } 4150 } 4151 4152 const struct sys_reg_desc *get_reg_by_id(u64 id, 4153 const struct sys_reg_desc table[], 4154 unsigned int num) 4155 { 4156 struct sys_reg_params params; 4157 4158 if (!index_to_params(id, ¶ms)) 4159 return NULL; 4160 4161 return find_reg(¶ms, table, num); 4162 } 4163 4164 /* Decode an index value, and find the sys_reg_desc entry. */ 4165 static const struct sys_reg_desc * 4166 id_to_sys_reg_desc(struct kvm_vcpu *vcpu, u64 id, 4167 const struct sys_reg_desc table[], unsigned int num) 4168 4169 { 4170 const struct sys_reg_desc *r; 4171 4172 /* We only do sys_reg for now. */ 4173 if ((id & KVM_REG_ARM_COPROC_MASK) != KVM_REG_ARM64_SYSREG) 4174 return NULL; 4175 4176 r = get_reg_by_id(id, table, num); 4177 4178 /* Not saved in the sys_reg array and not otherwise accessible? */ 4179 if (r && (!(r->reg || r->get_user) || sysreg_hidden(vcpu, r))) 4180 r = NULL; 4181 4182 return r; 4183 } 4184 4185 /* 4186 * These are the invariant sys_reg registers: we let the guest see the 4187 * host versions of these, so they're part of the guest state. 4188 * 4189 * A future CPU may provide a mechanism to present different values to 4190 * the guest, or a future kvm may trap them. 4191 */ 4192 4193 #define FUNCTION_INVARIANT(reg) \ 4194 static u64 reset_##reg(struct kvm_vcpu *v, \ 4195 const struct sys_reg_desc *r) \ 4196 { \ 4197 ((struct sys_reg_desc *)r)->val = read_sysreg(reg); \ 4198 return ((struct sys_reg_desc *)r)->val; \ 4199 } 4200 4201 FUNCTION_INVARIANT(midr_el1) 4202 FUNCTION_INVARIANT(revidr_el1) 4203 FUNCTION_INVARIANT(aidr_el1) 4204 4205 /* ->val is filled in by kvm_sys_reg_table_init() */ 4206 static struct sys_reg_desc invariant_sys_regs[] __ro_after_init = { 4207 { SYS_DESC(SYS_MIDR_EL1), NULL, reset_midr_el1 }, 4208 { SYS_DESC(SYS_REVIDR_EL1), NULL, reset_revidr_el1 }, 4209 { SYS_DESC(SYS_AIDR_EL1), NULL, reset_aidr_el1 }, 4210 }; 4211 4212 static int get_invariant_sys_reg(u64 id, u64 __user *uaddr) 4213 { 4214 const struct sys_reg_desc *r; 4215 4216 r = get_reg_by_id(id, invariant_sys_regs, 4217 ARRAY_SIZE(invariant_sys_regs)); 4218 if (!r) 4219 return -ENOENT; 4220 4221 return put_user(r->val, uaddr); 4222 } 4223 4224 static int set_invariant_sys_reg(u64 id, u64 __user *uaddr) 4225 { 4226 const struct sys_reg_desc *r; 4227 u64 val; 4228 4229 r = get_reg_by_id(id, invariant_sys_regs, 4230 ARRAY_SIZE(invariant_sys_regs)); 4231 if (!r) 4232 return -ENOENT; 4233 4234 if (get_user(val, uaddr)) 4235 return -EFAULT; 4236 4237 /* This is what we mean by invariant: you can't change it. */ 4238 if (r->val != val) 4239 return -EINVAL; 4240 4241 return 0; 4242 } 4243 4244 static int demux_c15_get(struct kvm_vcpu *vcpu, u64 id, void __user *uaddr) 4245 { 4246 u32 val; 4247 u32 __user *uval = uaddr; 4248 4249 /* Fail if we have unknown bits set. */ 4250 if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK 4251 | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1))) 4252 return -ENOENT; 4253 4254 switch (id & KVM_REG_ARM_DEMUX_ID_MASK) { 4255 case KVM_REG_ARM_DEMUX_ID_CCSIDR: 4256 if (KVM_REG_SIZE(id) != 4) 4257 return -ENOENT; 4258 val = (id & KVM_REG_ARM_DEMUX_VAL_MASK) 4259 >> KVM_REG_ARM_DEMUX_VAL_SHIFT; 4260 if (val >= CSSELR_MAX) 4261 return -ENOENT; 4262 4263 return put_user(get_ccsidr(vcpu, val), uval); 4264 default: 4265 return -ENOENT; 4266 } 4267 } 4268 4269 static int demux_c15_set(struct kvm_vcpu *vcpu, u64 id, void __user *uaddr) 4270 { 4271 u32 val, newval; 4272 u32 __user *uval = uaddr; 4273 4274 /* Fail if we have unknown bits set. */ 4275 if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK 4276 | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1))) 4277 return -ENOENT; 4278 4279 switch (id & KVM_REG_ARM_DEMUX_ID_MASK) { 4280 case KVM_REG_ARM_DEMUX_ID_CCSIDR: 4281 if (KVM_REG_SIZE(id) != 4) 4282 return -ENOENT; 4283 val = (id & KVM_REG_ARM_DEMUX_VAL_MASK) 4284 >> KVM_REG_ARM_DEMUX_VAL_SHIFT; 4285 if (val >= CSSELR_MAX) 4286 return -ENOENT; 4287 4288 if (get_user(newval, uval)) 4289 return -EFAULT; 4290 4291 return set_ccsidr(vcpu, val, newval); 4292 default: 4293 return -ENOENT; 4294 } 4295 } 4296 4297 int kvm_sys_reg_get_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg, 4298 const struct sys_reg_desc table[], unsigned int num) 4299 { 4300 u64 __user *uaddr = (u64 __user *)(unsigned long)reg->addr; 4301 const struct sys_reg_desc *r; 4302 u64 val; 4303 int ret; 4304 4305 r = id_to_sys_reg_desc(vcpu, reg->id, table, num); 4306 if (!r || sysreg_hidden_user(vcpu, r)) 4307 return -ENOENT; 4308 4309 if (r->get_user) { 4310 ret = (r->get_user)(vcpu, r, &val); 4311 } else { 4312 val = __vcpu_sys_reg(vcpu, r->reg); 4313 ret = 0; 4314 } 4315 4316 if (!ret) 4317 ret = put_user(val, uaddr); 4318 4319 return ret; 4320 } 4321 4322 int kvm_arm_sys_reg_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) 4323 { 4324 void __user *uaddr = (void __user *)(unsigned long)reg->addr; 4325 int err; 4326 4327 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX) 4328 return demux_c15_get(vcpu, reg->id, uaddr); 4329 4330 err = get_invariant_sys_reg(reg->id, uaddr); 4331 if (err != -ENOENT) 4332 return err; 4333 4334 return kvm_sys_reg_get_user(vcpu, reg, 4335 sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); 4336 } 4337 4338 int kvm_sys_reg_set_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg, 4339 const struct sys_reg_desc table[], unsigned int num) 4340 { 4341 u64 __user *uaddr = (u64 __user *)(unsigned long)reg->addr; 4342 const struct sys_reg_desc *r; 4343 u64 val; 4344 int ret; 4345 4346 if (get_user(val, uaddr)) 4347 return -EFAULT; 4348 4349 r = id_to_sys_reg_desc(vcpu, reg->id, table, num); 4350 if (!r || sysreg_hidden_user(vcpu, r)) 4351 return -ENOENT; 4352 4353 if (sysreg_user_write_ignore(vcpu, r)) 4354 return 0; 4355 4356 if (r->set_user) { 4357 ret = (r->set_user)(vcpu, r, val); 4358 } else { 4359 __vcpu_sys_reg(vcpu, r->reg) = val; 4360 ret = 0; 4361 } 4362 4363 return ret; 4364 } 4365 4366 int kvm_arm_sys_reg_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) 4367 { 4368 void __user *uaddr = (void __user *)(unsigned long)reg->addr; 4369 int err; 4370 4371 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX) 4372 return demux_c15_set(vcpu, reg->id, uaddr); 4373 4374 err = set_invariant_sys_reg(reg->id, uaddr); 4375 if (err != -ENOENT) 4376 return err; 4377 4378 return kvm_sys_reg_set_user(vcpu, reg, 4379 sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); 4380 } 4381 4382 static unsigned int num_demux_regs(void) 4383 { 4384 return CSSELR_MAX; 4385 } 4386 4387 static int write_demux_regids(u64 __user *uindices) 4388 { 4389 u64 val = KVM_REG_ARM64 | KVM_REG_SIZE_U32 | KVM_REG_ARM_DEMUX; 4390 unsigned int i; 4391 4392 val |= KVM_REG_ARM_DEMUX_ID_CCSIDR; 4393 for (i = 0; i < CSSELR_MAX; i++) { 4394 if (put_user(val | i, uindices)) 4395 return -EFAULT; 4396 uindices++; 4397 } 4398 return 0; 4399 } 4400 4401 static u64 sys_reg_to_index(const struct sys_reg_desc *reg) 4402 { 4403 return (KVM_REG_ARM64 | KVM_REG_SIZE_U64 | 4404 KVM_REG_ARM64_SYSREG | 4405 (reg->Op0 << KVM_REG_ARM64_SYSREG_OP0_SHIFT) | 4406 (reg->Op1 << KVM_REG_ARM64_SYSREG_OP1_SHIFT) | 4407 (reg->CRn << KVM_REG_ARM64_SYSREG_CRN_SHIFT) | 4408 (reg->CRm << KVM_REG_ARM64_SYSREG_CRM_SHIFT) | 4409 (reg->Op2 << KVM_REG_ARM64_SYSREG_OP2_SHIFT)); 4410 } 4411 4412 static bool copy_reg_to_user(const struct sys_reg_desc *reg, u64 __user **uind) 4413 { 4414 if (!*uind) 4415 return true; 4416 4417 if (put_user(sys_reg_to_index(reg), *uind)) 4418 return false; 4419 4420 (*uind)++; 4421 return true; 4422 } 4423 4424 static int walk_one_sys_reg(const struct kvm_vcpu *vcpu, 4425 const struct sys_reg_desc *rd, 4426 u64 __user **uind, 4427 unsigned int *total) 4428 { 4429 /* 4430 * Ignore registers we trap but don't save, 4431 * and for which no custom user accessor is provided. 4432 */ 4433 if (!(rd->reg || rd->get_user)) 4434 return 0; 4435 4436 if (sysreg_hidden_user(vcpu, rd)) 4437 return 0; 4438 4439 if (!copy_reg_to_user(rd, uind)) 4440 return -EFAULT; 4441 4442 (*total)++; 4443 return 0; 4444 } 4445 4446 /* Assumed ordered tables, see kvm_sys_reg_table_init. */ 4447 static int walk_sys_regs(struct kvm_vcpu *vcpu, u64 __user *uind) 4448 { 4449 const struct sys_reg_desc *i2, *end2; 4450 unsigned int total = 0; 4451 int err; 4452 4453 i2 = sys_reg_descs; 4454 end2 = sys_reg_descs + ARRAY_SIZE(sys_reg_descs); 4455 4456 while (i2 != end2) { 4457 err = walk_one_sys_reg(vcpu, i2++, &uind, &total); 4458 if (err) 4459 return err; 4460 } 4461 return total; 4462 } 4463 4464 unsigned long kvm_arm_num_sys_reg_descs(struct kvm_vcpu *vcpu) 4465 { 4466 return ARRAY_SIZE(invariant_sys_regs) 4467 + num_demux_regs() 4468 + walk_sys_regs(vcpu, (u64 __user *)NULL); 4469 } 4470 4471 int kvm_arm_copy_sys_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices) 4472 { 4473 unsigned int i; 4474 int err; 4475 4476 /* Then give them all the invariant registers' indices. */ 4477 for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++) { 4478 if (put_user(sys_reg_to_index(&invariant_sys_regs[i]), uindices)) 4479 return -EFAULT; 4480 uindices++; 4481 } 4482 4483 err = walk_sys_regs(vcpu, uindices); 4484 if (err < 0) 4485 return err; 4486 uindices += err; 4487 4488 return write_demux_regids(uindices); 4489 } 4490 4491 #define KVM_ARM_FEATURE_ID_RANGE_INDEX(r) \ 4492 KVM_ARM_FEATURE_ID_RANGE_IDX(sys_reg_Op0(r), \ 4493 sys_reg_Op1(r), \ 4494 sys_reg_CRn(r), \ 4495 sys_reg_CRm(r), \ 4496 sys_reg_Op2(r)) 4497 4498 int kvm_vm_ioctl_get_reg_writable_masks(struct kvm *kvm, struct reg_mask_range *range) 4499 { 4500 const void *zero_page = page_to_virt(ZERO_PAGE(0)); 4501 u64 __user *masks = (u64 __user *)range->addr; 4502 4503 /* Only feature id range is supported, reserved[13] must be zero. */ 4504 if (range->range || 4505 memcmp(range->reserved, zero_page, sizeof(range->reserved))) 4506 return -EINVAL; 4507 4508 /* Wipe the whole thing first */ 4509 if (clear_user(masks, KVM_ARM_FEATURE_ID_RANGE_SIZE * sizeof(__u64))) 4510 return -EFAULT; 4511 4512 for (int i = 0; i < ARRAY_SIZE(sys_reg_descs); i++) { 4513 const struct sys_reg_desc *reg = &sys_reg_descs[i]; 4514 u32 encoding = reg_to_encoding(reg); 4515 u64 val; 4516 4517 if (!is_feature_id_reg(encoding) || !reg->set_user) 4518 continue; 4519 4520 if (!reg->val || 4521 (is_aa32_id_reg(encoding) && !kvm_supports_32bit_el0())) { 4522 continue; 4523 } 4524 val = reg->val; 4525 4526 if (put_user(val, (masks + KVM_ARM_FEATURE_ID_RANGE_INDEX(encoding)))) 4527 return -EFAULT; 4528 } 4529 4530 return 0; 4531 } 4532 4533 static void vcpu_set_hcr(struct kvm_vcpu *vcpu) 4534 { 4535 struct kvm *kvm = vcpu->kvm; 4536 4537 if (has_vhe() || has_hvhe()) 4538 vcpu->arch.hcr_el2 |= HCR_E2H; 4539 if (cpus_have_final_cap(ARM64_HAS_RAS_EXTN)) { 4540 /* route synchronous external abort exceptions to EL2 */ 4541 vcpu->arch.hcr_el2 |= HCR_TEA; 4542 /* trap error record accesses */ 4543 vcpu->arch.hcr_el2 |= HCR_TERR; 4544 } 4545 4546 if (cpus_have_final_cap(ARM64_HAS_STAGE2_FWB)) 4547 vcpu->arch.hcr_el2 |= HCR_FWB; 4548 4549 if (cpus_have_final_cap(ARM64_HAS_EVT) && 4550 !cpus_have_final_cap(ARM64_MISMATCHED_CACHE_TYPE) && 4551 kvm_read_vm_id_reg(kvm, SYS_CTR_EL0) == read_sanitised_ftr_reg(SYS_CTR_EL0)) 4552 vcpu->arch.hcr_el2 |= HCR_TID4; 4553 else 4554 vcpu->arch.hcr_el2 |= HCR_TID2; 4555 4556 if (vcpu_el1_is_32bit(vcpu)) 4557 vcpu->arch.hcr_el2 &= ~HCR_RW; 4558 4559 if (kvm_has_mte(vcpu->kvm)) 4560 vcpu->arch.hcr_el2 |= HCR_ATA; 4561 4562 /* 4563 * In the absence of FGT, we cannot independently trap TLBI 4564 * Range instructions. This isn't great, but trapping all 4565 * TLBIs would be far worse. Live with it... 4566 */ 4567 if (!kvm_has_feat(kvm, ID_AA64ISAR0_EL1, TLB, OS)) 4568 vcpu->arch.hcr_el2 |= HCR_TTLBOS; 4569 } 4570 4571 void kvm_calculate_traps(struct kvm_vcpu *vcpu) 4572 { 4573 struct kvm *kvm = vcpu->kvm; 4574 4575 mutex_lock(&kvm->arch.config_lock); 4576 vcpu_set_hcr(vcpu); 4577 4578 if (cpus_have_final_cap(ARM64_HAS_HCX)) { 4579 /* 4580 * In general, all HCRX_EL2 bits are gated by a feature. 4581 * The only reason we can set SMPME without checking any 4582 * feature is that its effects are not directly observable 4583 * from the guest. 4584 */ 4585 vcpu->arch.hcrx_el2 = HCRX_EL2_SMPME; 4586 4587 if (kvm_has_feat(kvm, ID_AA64ISAR2_EL1, MOPS, IMP)) 4588 vcpu->arch.hcrx_el2 |= (HCRX_EL2_MSCEn | HCRX_EL2_MCE2); 4589 4590 if (kvm_has_feat(kvm, ID_AA64MMFR3_EL1, TCRX, IMP)) 4591 vcpu->arch.hcrx_el2 |= HCRX_EL2_TCR2En; 4592 4593 if (kvm_has_fpmr(kvm)) 4594 vcpu->arch.hcrx_el2 |= HCRX_EL2_EnFPM; 4595 } 4596 4597 if (test_bit(KVM_ARCH_FLAG_FGU_INITIALIZED, &kvm->arch.flags)) 4598 goto out; 4599 4600 kvm->arch.fgu[HFGxTR_GROUP] = (HFGxTR_EL2_nAMAIR2_EL1 | 4601 HFGxTR_EL2_nMAIR2_EL1 | 4602 HFGxTR_EL2_nS2POR_EL1 | 4603 HFGxTR_EL2_nPOR_EL1 | 4604 HFGxTR_EL2_nPOR_EL0 | 4605 HFGxTR_EL2_nACCDATA_EL1 | 4606 HFGxTR_EL2_nSMPRI_EL1_MASK | 4607 HFGxTR_EL2_nTPIDR2_EL0_MASK); 4608 4609 if (!kvm_has_feat(kvm, ID_AA64ISAR0_EL1, TLB, OS)) 4610 kvm->arch.fgu[HFGITR_GROUP] |= (HFGITR_EL2_TLBIRVAALE1OS| 4611 HFGITR_EL2_TLBIRVALE1OS | 4612 HFGITR_EL2_TLBIRVAAE1OS | 4613 HFGITR_EL2_TLBIRVAE1OS | 4614 HFGITR_EL2_TLBIVAALE1OS | 4615 HFGITR_EL2_TLBIVALE1OS | 4616 HFGITR_EL2_TLBIVAAE1OS | 4617 HFGITR_EL2_TLBIASIDE1OS | 4618 HFGITR_EL2_TLBIVAE1OS | 4619 HFGITR_EL2_TLBIVMALLE1OS); 4620 4621 if (!kvm_has_feat(kvm, ID_AA64ISAR0_EL1, TLB, RANGE)) 4622 kvm->arch.fgu[HFGITR_GROUP] |= (HFGITR_EL2_TLBIRVAALE1 | 4623 HFGITR_EL2_TLBIRVALE1 | 4624 HFGITR_EL2_TLBIRVAAE1 | 4625 HFGITR_EL2_TLBIRVAE1 | 4626 HFGITR_EL2_TLBIRVAALE1IS| 4627 HFGITR_EL2_TLBIRVALE1IS | 4628 HFGITR_EL2_TLBIRVAAE1IS | 4629 HFGITR_EL2_TLBIRVAE1IS | 4630 HFGITR_EL2_TLBIRVAALE1OS| 4631 HFGITR_EL2_TLBIRVALE1OS | 4632 HFGITR_EL2_TLBIRVAAE1OS | 4633 HFGITR_EL2_TLBIRVAE1OS); 4634 4635 if (!kvm_has_feat(kvm, ID_AA64MMFR3_EL1, S1PIE, IMP)) 4636 kvm->arch.fgu[HFGxTR_GROUP] |= (HFGxTR_EL2_nPIRE0_EL1 | 4637 HFGxTR_EL2_nPIR_EL1); 4638 4639 if (!kvm_has_feat(kvm, ID_AA64PFR0_EL1, AMU, IMP)) 4640 kvm->arch.fgu[HAFGRTR_GROUP] |= ~(HAFGRTR_EL2_RES0 | 4641 HAFGRTR_EL2_RES1); 4642 4643 set_bit(KVM_ARCH_FLAG_FGU_INITIALIZED, &kvm->arch.flags); 4644 out: 4645 mutex_unlock(&kvm->arch.config_lock); 4646 } 4647 4648 int __init kvm_sys_reg_table_init(void) 4649 { 4650 bool valid = true; 4651 unsigned int i; 4652 int ret = 0; 4653 4654 /* Make sure tables are unique and in order. */ 4655 valid &= check_sysreg_table(sys_reg_descs, ARRAY_SIZE(sys_reg_descs), false); 4656 valid &= check_sysreg_table(cp14_regs, ARRAY_SIZE(cp14_regs), true); 4657 valid &= check_sysreg_table(cp14_64_regs, ARRAY_SIZE(cp14_64_regs), true); 4658 valid &= check_sysreg_table(cp15_regs, ARRAY_SIZE(cp15_regs), true); 4659 valid &= check_sysreg_table(cp15_64_regs, ARRAY_SIZE(cp15_64_regs), true); 4660 valid &= check_sysreg_table(invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs), false); 4661 valid &= check_sysreg_table(sys_insn_descs, ARRAY_SIZE(sys_insn_descs), false); 4662 4663 if (!valid) 4664 return -EINVAL; 4665 4666 /* We abuse the reset function to overwrite the table itself. */ 4667 for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++) 4668 invariant_sys_regs[i].reset(NULL, &invariant_sys_regs[i]); 4669 4670 ret = populate_nv_trap_config(); 4671 4672 for (i = 0; !ret && i < ARRAY_SIZE(sys_reg_descs); i++) 4673 ret = populate_sysreg_config(sys_reg_descs + i, i); 4674 4675 for (i = 0; !ret && i < ARRAY_SIZE(sys_insn_descs); i++) 4676 ret = populate_sysreg_config(sys_insn_descs + i, i); 4677 4678 return ret; 4679 } 4680