1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2012,2013 - ARM Ltd 4 * Author: Marc Zyngier <marc.zyngier@arm.com> 5 * 6 * Derived from arch/arm/kvm/coproc.c: 7 * Copyright (C) 2012 - Virtual Open Systems and Columbia University 8 * Authors: Rusty Russell <rusty@rustcorp.com.au> 9 * Christoffer Dall <c.dall@virtualopensystems.com> 10 */ 11 12 #include <linux/bsearch.h> 13 #include <linux/kvm_host.h> 14 #include <linux/mm.h> 15 #include <linux/printk.h> 16 #include <linux/uaccess.h> 17 18 #include <asm/cacheflush.h> 19 #include <asm/cputype.h> 20 #include <asm/debug-monitors.h> 21 #include <asm/esr.h> 22 #include <asm/kvm_arm.h> 23 #include <asm/kvm_coproc.h> 24 #include <asm/kvm_emulate.h> 25 #include <asm/kvm_host.h> 26 #include <asm/kvm_hyp.h> 27 #include <asm/kvm_mmu.h> 28 #include <asm/perf_event.h> 29 #include <asm/sysreg.h> 30 31 #include <trace/events/kvm.h> 32 33 #include "sys_regs.h" 34 35 #include "trace.h" 36 37 /* 38 * All of this file is extremly similar to the ARM coproc.c, but the 39 * types are different. My gut feeling is that it should be pretty 40 * easy to merge, but that would be an ABI breakage -- again. VFP 41 * would also need to be abstracted. 42 * 43 * For AArch32, we only take care of what is being trapped. Anything 44 * that has to do with init and userspace access has to go via the 45 * 64bit interface. 46 */ 47 48 static bool read_from_write_only(struct kvm_vcpu *vcpu, 49 struct sys_reg_params *params, 50 const struct sys_reg_desc *r) 51 { 52 WARN_ONCE(1, "Unexpected sys_reg read to write-only register\n"); 53 print_sys_reg_instr(params); 54 kvm_inject_undefined(vcpu); 55 return false; 56 } 57 58 static bool write_to_read_only(struct kvm_vcpu *vcpu, 59 struct sys_reg_params *params, 60 const struct sys_reg_desc *r) 61 { 62 WARN_ONCE(1, "Unexpected sys_reg write to read-only register\n"); 63 print_sys_reg_instr(params); 64 kvm_inject_undefined(vcpu); 65 return false; 66 } 67 68 u64 vcpu_read_sys_reg(const struct kvm_vcpu *vcpu, int reg) 69 { 70 if (!vcpu->arch.sysregs_loaded_on_cpu) 71 goto immediate_read; 72 73 /* 74 * System registers listed in the switch are not saved on every 75 * exit from the guest but are only saved on vcpu_put. 76 * 77 * Note that MPIDR_EL1 for the guest is set by KVM via VMPIDR_EL2 but 78 * should never be listed below, because the guest cannot modify its 79 * own MPIDR_EL1 and MPIDR_EL1 is accessed for VCPU A from VCPU B's 80 * thread when emulating cross-VCPU communication. 81 */ 82 switch (reg) { 83 case CSSELR_EL1: return read_sysreg_s(SYS_CSSELR_EL1); 84 case SCTLR_EL1: return read_sysreg_s(SYS_SCTLR_EL12); 85 case ACTLR_EL1: return read_sysreg_s(SYS_ACTLR_EL1); 86 case CPACR_EL1: return read_sysreg_s(SYS_CPACR_EL12); 87 case TTBR0_EL1: return read_sysreg_s(SYS_TTBR0_EL12); 88 case TTBR1_EL1: return read_sysreg_s(SYS_TTBR1_EL12); 89 case TCR_EL1: return read_sysreg_s(SYS_TCR_EL12); 90 case ESR_EL1: return read_sysreg_s(SYS_ESR_EL12); 91 case AFSR0_EL1: return read_sysreg_s(SYS_AFSR0_EL12); 92 case AFSR1_EL1: return read_sysreg_s(SYS_AFSR1_EL12); 93 case FAR_EL1: return read_sysreg_s(SYS_FAR_EL12); 94 case MAIR_EL1: return read_sysreg_s(SYS_MAIR_EL12); 95 case VBAR_EL1: return read_sysreg_s(SYS_VBAR_EL12); 96 case CONTEXTIDR_EL1: return read_sysreg_s(SYS_CONTEXTIDR_EL12); 97 case TPIDR_EL0: return read_sysreg_s(SYS_TPIDR_EL0); 98 case TPIDRRO_EL0: return read_sysreg_s(SYS_TPIDRRO_EL0); 99 case TPIDR_EL1: return read_sysreg_s(SYS_TPIDR_EL1); 100 case AMAIR_EL1: return read_sysreg_s(SYS_AMAIR_EL12); 101 case CNTKCTL_EL1: return read_sysreg_s(SYS_CNTKCTL_EL12); 102 case PAR_EL1: return read_sysreg_s(SYS_PAR_EL1); 103 case DACR32_EL2: return read_sysreg_s(SYS_DACR32_EL2); 104 case IFSR32_EL2: return read_sysreg_s(SYS_IFSR32_EL2); 105 case DBGVCR32_EL2: return read_sysreg_s(SYS_DBGVCR32_EL2); 106 } 107 108 immediate_read: 109 return __vcpu_sys_reg(vcpu, reg); 110 } 111 112 void vcpu_write_sys_reg(struct kvm_vcpu *vcpu, u64 val, int reg) 113 { 114 if (!vcpu->arch.sysregs_loaded_on_cpu) 115 goto immediate_write; 116 117 /* 118 * System registers listed in the switch are not restored on every 119 * entry to the guest but are only restored on vcpu_load. 120 * 121 * Note that MPIDR_EL1 for the guest is set by KVM via VMPIDR_EL2 but 122 * should never be listed below, because the the MPIDR should only be 123 * set once, before running the VCPU, and never changed later. 124 */ 125 switch (reg) { 126 case CSSELR_EL1: write_sysreg_s(val, SYS_CSSELR_EL1); return; 127 case SCTLR_EL1: write_sysreg_s(val, SYS_SCTLR_EL12); return; 128 case ACTLR_EL1: write_sysreg_s(val, SYS_ACTLR_EL1); return; 129 case CPACR_EL1: write_sysreg_s(val, SYS_CPACR_EL12); return; 130 case TTBR0_EL1: write_sysreg_s(val, SYS_TTBR0_EL12); return; 131 case TTBR1_EL1: write_sysreg_s(val, SYS_TTBR1_EL12); return; 132 case TCR_EL1: write_sysreg_s(val, SYS_TCR_EL12); return; 133 case ESR_EL1: write_sysreg_s(val, SYS_ESR_EL12); return; 134 case AFSR0_EL1: write_sysreg_s(val, SYS_AFSR0_EL12); return; 135 case AFSR1_EL1: write_sysreg_s(val, SYS_AFSR1_EL12); return; 136 case FAR_EL1: write_sysreg_s(val, SYS_FAR_EL12); return; 137 case MAIR_EL1: write_sysreg_s(val, SYS_MAIR_EL12); return; 138 case VBAR_EL1: write_sysreg_s(val, SYS_VBAR_EL12); return; 139 case CONTEXTIDR_EL1: write_sysreg_s(val, SYS_CONTEXTIDR_EL12); return; 140 case TPIDR_EL0: write_sysreg_s(val, SYS_TPIDR_EL0); return; 141 case TPIDRRO_EL0: write_sysreg_s(val, SYS_TPIDRRO_EL0); return; 142 case TPIDR_EL1: write_sysreg_s(val, SYS_TPIDR_EL1); return; 143 case AMAIR_EL1: write_sysreg_s(val, SYS_AMAIR_EL12); return; 144 case CNTKCTL_EL1: write_sysreg_s(val, SYS_CNTKCTL_EL12); return; 145 case PAR_EL1: write_sysreg_s(val, SYS_PAR_EL1); return; 146 case DACR32_EL2: write_sysreg_s(val, SYS_DACR32_EL2); return; 147 case IFSR32_EL2: write_sysreg_s(val, SYS_IFSR32_EL2); return; 148 case DBGVCR32_EL2: write_sysreg_s(val, SYS_DBGVCR32_EL2); return; 149 } 150 151 immediate_write: 152 __vcpu_sys_reg(vcpu, reg) = val; 153 } 154 155 /* 3 bits per cache level, as per CLIDR, but non-existent caches always 0 */ 156 static u32 cache_levels; 157 158 /* CSSELR values; used to index KVM_REG_ARM_DEMUX_ID_CCSIDR */ 159 #define CSSELR_MAX 12 160 161 /* Which cache CCSIDR represents depends on CSSELR value. */ 162 static u32 get_ccsidr(u32 csselr) 163 { 164 u32 ccsidr; 165 166 /* Make sure noone else changes CSSELR during this! */ 167 local_irq_disable(); 168 write_sysreg(csselr, csselr_el1); 169 isb(); 170 ccsidr = read_sysreg(ccsidr_el1); 171 local_irq_enable(); 172 173 return ccsidr; 174 } 175 176 /* 177 * See note at ARMv7 ARM B1.14.4 (TL;DR: S/W ops are not easily virtualized). 178 */ 179 static bool access_dcsw(struct kvm_vcpu *vcpu, 180 struct sys_reg_params *p, 181 const struct sys_reg_desc *r) 182 { 183 if (!p->is_write) 184 return read_from_write_only(vcpu, p, r); 185 186 /* 187 * Only track S/W ops if we don't have FWB. It still indicates 188 * that the guest is a bit broken (S/W operations should only 189 * be done by firmware, knowing that there is only a single 190 * CPU left in the system, and certainly not from non-secure 191 * software). 192 */ 193 if (!cpus_have_const_cap(ARM64_HAS_STAGE2_FWB)) 194 kvm_set_way_flush(vcpu); 195 196 return true; 197 } 198 199 /* 200 * Generic accessor for VM registers. Only called as long as HCR_TVM 201 * is set. If the guest enables the MMU, we stop trapping the VM 202 * sys_regs and leave it in complete control of the caches. 203 */ 204 static bool access_vm_reg(struct kvm_vcpu *vcpu, 205 struct sys_reg_params *p, 206 const struct sys_reg_desc *r) 207 { 208 bool was_enabled = vcpu_has_cache_enabled(vcpu); 209 u64 val; 210 int reg = r->reg; 211 212 BUG_ON(!p->is_write); 213 214 /* See the 32bit mapping in kvm_host.h */ 215 if (p->is_aarch32) 216 reg = r->reg / 2; 217 218 if (!p->is_aarch32 || !p->is_32bit) { 219 val = p->regval; 220 } else { 221 val = vcpu_read_sys_reg(vcpu, reg); 222 if (r->reg % 2) 223 val = (p->regval << 32) | (u64)lower_32_bits(val); 224 else 225 val = ((u64)upper_32_bits(val) << 32) | 226 lower_32_bits(p->regval); 227 } 228 vcpu_write_sys_reg(vcpu, val, reg); 229 230 kvm_toggle_cache(vcpu, was_enabled); 231 return true; 232 } 233 234 /* 235 * Trap handler for the GICv3 SGI generation system register. 236 * Forward the request to the VGIC emulation. 237 * The cp15_64 code makes sure this automatically works 238 * for both AArch64 and AArch32 accesses. 239 */ 240 static bool access_gic_sgi(struct kvm_vcpu *vcpu, 241 struct sys_reg_params *p, 242 const struct sys_reg_desc *r) 243 { 244 bool g1; 245 246 if (!p->is_write) 247 return read_from_write_only(vcpu, p, r); 248 249 /* 250 * In a system where GICD_CTLR.DS=1, a ICC_SGI0R_EL1 access generates 251 * Group0 SGIs only, while ICC_SGI1R_EL1 can generate either group, 252 * depending on the SGI configuration. ICC_ASGI1R_EL1 is effectively 253 * equivalent to ICC_SGI0R_EL1, as there is no "alternative" secure 254 * group. 255 */ 256 if (p->is_aarch32) { 257 switch (p->Op1) { 258 default: /* Keep GCC quiet */ 259 case 0: /* ICC_SGI1R */ 260 g1 = true; 261 break; 262 case 1: /* ICC_ASGI1R */ 263 case 2: /* ICC_SGI0R */ 264 g1 = false; 265 break; 266 } 267 } else { 268 switch (p->Op2) { 269 default: /* Keep GCC quiet */ 270 case 5: /* ICC_SGI1R_EL1 */ 271 g1 = true; 272 break; 273 case 6: /* ICC_ASGI1R_EL1 */ 274 case 7: /* ICC_SGI0R_EL1 */ 275 g1 = false; 276 break; 277 } 278 } 279 280 vgic_v3_dispatch_sgi(vcpu, p->regval, g1); 281 282 return true; 283 } 284 285 static bool access_gic_sre(struct kvm_vcpu *vcpu, 286 struct sys_reg_params *p, 287 const struct sys_reg_desc *r) 288 { 289 if (p->is_write) 290 return ignore_write(vcpu, p); 291 292 p->regval = vcpu->arch.vgic_cpu.vgic_v3.vgic_sre; 293 return true; 294 } 295 296 static bool trap_raz_wi(struct kvm_vcpu *vcpu, 297 struct sys_reg_params *p, 298 const struct sys_reg_desc *r) 299 { 300 if (p->is_write) 301 return ignore_write(vcpu, p); 302 else 303 return read_zero(vcpu, p); 304 } 305 306 /* 307 * ARMv8.1 mandates at least a trivial LORegion implementation, where all the 308 * RW registers are RES0 (which we can implement as RAZ/WI). On an ARMv8.0 309 * system, these registers should UNDEF. LORID_EL1 being a RO register, we 310 * treat it separately. 311 */ 312 static bool trap_loregion(struct kvm_vcpu *vcpu, 313 struct sys_reg_params *p, 314 const struct sys_reg_desc *r) 315 { 316 u64 val = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1); 317 u32 sr = sys_reg((u32)r->Op0, (u32)r->Op1, 318 (u32)r->CRn, (u32)r->CRm, (u32)r->Op2); 319 320 if (!(val & (0xfUL << ID_AA64MMFR1_LOR_SHIFT))) { 321 kvm_inject_undefined(vcpu); 322 return false; 323 } 324 325 if (p->is_write && sr == SYS_LORID_EL1) 326 return write_to_read_only(vcpu, p, r); 327 328 return trap_raz_wi(vcpu, p, r); 329 } 330 331 static bool trap_oslsr_el1(struct kvm_vcpu *vcpu, 332 struct sys_reg_params *p, 333 const struct sys_reg_desc *r) 334 { 335 if (p->is_write) { 336 return ignore_write(vcpu, p); 337 } else { 338 p->regval = (1 << 3); 339 return true; 340 } 341 } 342 343 static bool trap_dbgauthstatus_el1(struct kvm_vcpu *vcpu, 344 struct sys_reg_params *p, 345 const struct sys_reg_desc *r) 346 { 347 if (p->is_write) { 348 return ignore_write(vcpu, p); 349 } else { 350 p->regval = read_sysreg(dbgauthstatus_el1); 351 return true; 352 } 353 } 354 355 /* 356 * We want to avoid world-switching all the DBG registers all the 357 * time: 358 * 359 * - If we've touched any debug register, it is likely that we're 360 * going to touch more of them. It then makes sense to disable the 361 * traps and start doing the save/restore dance 362 * - If debug is active (DBG_MDSCR_KDE or DBG_MDSCR_MDE set), it is 363 * then mandatory to save/restore the registers, as the guest 364 * depends on them. 365 * 366 * For this, we use a DIRTY bit, indicating the guest has modified the 367 * debug registers, used as follow: 368 * 369 * On guest entry: 370 * - If the dirty bit is set (because we're coming back from trapping), 371 * disable the traps, save host registers, restore guest registers. 372 * - If debug is actively in use (DBG_MDSCR_KDE or DBG_MDSCR_MDE set), 373 * set the dirty bit, disable the traps, save host registers, 374 * restore guest registers. 375 * - Otherwise, enable the traps 376 * 377 * On guest exit: 378 * - If the dirty bit is set, save guest registers, restore host 379 * registers and clear the dirty bit. This ensure that the host can 380 * now use the debug registers. 381 */ 382 static bool trap_debug_regs(struct kvm_vcpu *vcpu, 383 struct sys_reg_params *p, 384 const struct sys_reg_desc *r) 385 { 386 if (p->is_write) { 387 vcpu_write_sys_reg(vcpu, p->regval, r->reg); 388 vcpu->arch.flags |= KVM_ARM64_DEBUG_DIRTY; 389 } else { 390 p->regval = vcpu_read_sys_reg(vcpu, r->reg); 391 } 392 393 trace_trap_reg(__func__, r->reg, p->is_write, p->regval); 394 395 return true; 396 } 397 398 /* 399 * reg_to_dbg/dbg_to_reg 400 * 401 * A 32 bit write to a debug register leave top bits alone 402 * A 32 bit read from a debug register only returns the bottom bits 403 * 404 * All writes will set the KVM_ARM64_DEBUG_DIRTY flag to ensure the 405 * hyp.S code switches between host and guest values in future. 406 */ 407 static void reg_to_dbg(struct kvm_vcpu *vcpu, 408 struct sys_reg_params *p, 409 u64 *dbg_reg) 410 { 411 u64 val = p->regval; 412 413 if (p->is_32bit) { 414 val &= 0xffffffffUL; 415 val |= ((*dbg_reg >> 32) << 32); 416 } 417 418 *dbg_reg = val; 419 vcpu->arch.flags |= KVM_ARM64_DEBUG_DIRTY; 420 } 421 422 static void dbg_to_reg(struct kvm_vcpu *vcpu, 423 struct sys_reg_params *p, 424 u64 *dbg_reg) 425 { 426 p->regval = *dbg_reg; 427 if (p->is_32bit) 428 p->regval &= 0xffffffffUL; 429 } 430 431 static bool trap_bvr(struct kvm_vcpu *vcpu, 432 struct sys_reg_params *p, 433 const struct sys_reg_desc *rd) 434 { 435 u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg]; 436 437 if (p->is_write) 438 reg_to_dbg(vcpu, p, dbg_reg); 439 else 440 dbg_to_reg(vcpu, p, dbg_reg); 441 442 trace_trap_reg(__func__, rd->reg, p->is_write, *dbg_reg); 443 444 return true; 445 } 446 447 static int set_bvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 448 const struct kvm_one_reg *reg, void __user *uaddr) 449 { 450 __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg]; 451 452 if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0) 453 return -EFAULT; 454 return 0; 455 } 456 457 static int get_bvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 458 const struct kvm_one_reg *reg, void __user *uaddr) 459 { 460 __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg]; 461 462 if (copy_to_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0) 463 return -EFAULT; 464 return 0; 465 } 466 467 static void reset_bvr(struct kvm_vcpu *vcpu, 468 const struct sys_reg_desc *rd) 469 { 470 vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg] = rd->val; 471 } 472 473 static bool trap_bcr(struct kvm_vcpu *vcpu, 474 struct sys_reg_params *p, 475 const struct sys_reg_desc *rd) 476 { 477 u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg]; 478 479 if (p->is_write) 480 reg_to_dbg(vcpu, p, dbg_reg); 481 else 482 dbg_to_reg(vcpu, p, dbg_reg); 483 484 trace_trap_reg(__func__, rd->reg, p->is_write, *dbg_reg); 485 486 return true; 487 } 488 489 static int set_bcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 490 const struct kvm_one_reg *reg, void __user *uaddr) 491 { 492 __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg]; 493 494 if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0) 495 return -EFAULT; 496 497 return 0; 498 } 499 500 static int get_bcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 501 const struct kvm_one_reg *reg, void __user *uaddr) 502 { 503 __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg]; 504 505 if (copy_to_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0) 506 return -EFAULT; 507 return 0; 508 } 509 510 static void reset_bcr(struct kvm_vcpu *vcpu, 511 const struct sys_reg_desc *rd) 512 { 513 vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg] = rd->val; 514 } 515 516 static bool trap_wvr(struct kvm_vcpu *vcpu, 517 struct sys_reg_params *p, 518 const struct sys_reg_desc *rd) 519 { 520 u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg]; 521 522 if (p->is_write) 523 reg_to_dbg(vcpu, p, dbg_reg); 524 else 525 dbg_to_reg(vcpu, p, dbg_reg); 526 527 trace_trap_reg(__func__, rd->reg, p->is_write, 528 vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg]); 529 530 return true; 531 } 532 533 static int set_wvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 534 const struct kvm_one_reg *reg, void __user *uaddr) 535 { 536 __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg]; 537 538 if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0) 539 return -EFAULT; 540 return 0; 541 } 542 543 static int get_wvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 544 const struct kvm_one_reg *reg, void __user *uaddr) 545 { 546 __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg]; 547 548 if (copy_to_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0) 549 return -EFAULT; 550 return 0; 551 } 552 553 static void reset_wvr(struct kvm_vcpu *vcpu, 554 const struct sys_reg_desc *rd) 555 { 556 vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg] = rd->val; 557 } 558 559 static bool trap_wcr(struct kvm_vcpu *vcpu, 560 struct sys_reg_params *p, 561 const struct sys_reg_desc *rd) 562 { 563 u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg]; 564 565 if (p->is_write) 566 reg_to_dbg(vcpu, p, dbg_reg); 567 else 568 dbg_to_reg(vcpu, p, dbg_reg); 569 570 trace_trap_reg(__func__, rd->reg, p->is_write, *dbg_reg); 571 572 return true; 573 } 574 575 static int set_wcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 576 const struct kvm_one_reg *reg, void __user *uaddr) 577 { 578 __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg]; 579 580 if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0) 581 return -EFAULT; 582 return 0; 583 } 584 585 static int get_wcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 586 const struct kvm_one_reg *reg, void __user *uaddr) 587 { 588 __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg]; 589 590 if (copy_to_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0) 591 return -EFAULT; 592 return 0; 593 } 594 595 static void reset_wcr(struct kvm_vcpu *vcpu, 596 const struct sys_reg_desc *rd) 597 { 598 vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg] = rd->val; 599 } 600 601 static void reset_amair_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 602 { 603 u64 amair = read_sysreg(amair_el1); 604 vcpu_write_sys_reg(vcpu, amair, AMAIR_EL1); 605 } 606 607 static void reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 608 { 609 u64 mpidr; 610 611 /* 612 * Map the vcpu_id into the first three affinity level fields of 613 * the MPIDR. We limit the number of VCPUs in level 0 due to a 614 * limitation to 16 CPUs in that level in the ICC_SGIxR registers 615 * of the GICv3 to be able to address each CPU directly when 616 * sending IPIs. 617 */ 618 mpidr = (vcpu->vcpu_id & 0x0f) << MPIDR_LEVEL_SHIFT(0); 619 mpidr |= ((vcpu->vcpu_id >> 4) & 0xff) << MPIDR_LEVEL_SHIFT(1); 620 mpidr |= ((vcpu->vcpu_id >> 12) & 0xff) << MPIDR_LEVEL_SHIFT(2); 621 vcpu_write_sys_reg(vcpu, (1ULL << 31) | mpidr, MPIDR_EL1); 622 } 623 624 static void reset_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 625 { 626 u64 pmcr, val; 627 628 pmcr = read_sysreg(pmcr_el0); 629 /* 630 * Writable bits of PMCR_EL0 (ARMV8_PMU_PMCR_MASK) are reset to UNKNOWN 631 * except PMCR.E resetting to zero. 632 */ 633 val = ((pmcr & ~ARMV8_PMU_PMCR_MASK) 634 | (ARMV8_PMU_PMCR_MASK & 0xdecafbad)) & (~ARMV8_PMU_PMCR_E); 635 __vcpu_sys_reg(vcpu, r->reg) = val; 636 } 637 638 static bool check_pmu_access_disabled(struct kvm_vcpu *vcpu, u64 flags) 639 { 640 u64 reg = __vcpu_sys_reg(vcpu, PMUSERENR_EL0); 641 bool enabled = (reg & flags) || vcpu_mode_priv(vcpu); 642 643 if (!enabled) 644 kvm_inject_undefined(vcpu); 645 646 return !enabled; 647 } 648 649 static bool pmu_access_el0_disabled(struct kvm_vcpu *vcpu) 650 { 651 return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_EN); 652 } 653 654 static bool pmu_write_swinc_el0_disabled(struct kvm_vcpu *vcpu) 655 { 656 return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_SW | ARMV8_PMU_USERENR_EN); 657 } 658 659 static bool pmu_access_cycle_counter_el0_disabled(struct kvm_vcpu *vcpu) 660 { 661 return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_CR | ARMV8_PMU_USERENR_EN); 662 } 663 664 static bool pmu_access_event_counter_el0_disabled(struct kvm_vcpu *vcpu) 665 { 666 return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_ER | ARMV8_PMU_USERENR_EN); 667 } 668 669 static bool access_pmcr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 670 const struct sys_reg_desc *r) 671 { 672 u64 val; 673 674 if (!kvm_arm_pmu_v3_ready(vcpu)) 675 return trap_raz_wi(vcpu, p, r); 676 677 if (pmu_access_el0_disabled(vcpu)) 678 return false; 679 680 if (p->is_write) { 681 /* Only update writeable bits of PMCR */ 682 val = __vcpu_sys_reg(vcpu, PMCR_EL0); 683 val &= ~ARMV8_PMU_PMCR_MASK; 684 val |= p->regval & ARMV8_PMU_PMCR_MASK; 685 __vcpu_sys_reg(vcpu, PMCR_EL0) = val; 686 kvm_pmu_handle_pmcr(vcpu, val); 687 kvm_vcpu_pmu_restore_guest(vcpu); 688 } else { 689 /* PMCR.P & PMCR.C are RAZ */ 690 val = __vcpu_sys_reg(vcpu, PMCR_EL0) 691 & ~(ARMV8_PMU_PMCR_P | ARMV8_PMU_PMCR_C); 692 p->regval = val; 693 } 694 695 return true; 696 } 697 698 static bool access_pmselr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 699 const struct sys_reg_desc *r) 700 { 701 if (!kvm_arm_pmu_v3_ready(vcpu)) 702 return trap_raz_wi(vcpu, p, r); 703 704 if (pmu_access_event_counter_el0_disabled(vcpu)) 705 return false; 706 707 if (p->is_write) 708 __vcpu_sys_reg(vcpu, PMSELR_EL0) = p->regval; 709 else 710 /* return PMSELR.SEL field */ 711 p->regval = __vcpu_sys_reg(vcpu, PMSELR_EL0) 712 & ARMV8_PMU_COUNTER_MASK; 713 714 return true; 715 } 716 717 static bool access_pmceid(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 718 const struct sys_reg_desc *r) 719 { 720 u64 pmceid; 721 722 if (!kvm_arm_pmu_v3_ready(vcpu)) 723 return trap_raz_wi(vcpu, p, r); 724 725 BUG_ON(p->is_write); 726 727 if (pmu_access_el0_disabled(vcpu)) 728 return false; 729 730 if (!(p->Op2 & 1)) 731 pmceid = read_sysreg(pmceid0_el0); 732 else 733 pmceid = read_sysreg(pmceid1_el0); 734 735 p->regval = pmceid; 736 737 return true; 738 } 739 740 static bool pmu_counter_idx_valid(struct kvm_vcpu *vcpu, u64 idx) 741 { 742 u64 pmcr, val; 743 744 pmcr = __vcpu_sys_reg(vcpu, PMCR_EL0); 745 val = (pmcr >> ARMV8_PMU_PMCR_N_SHIFT) & ARMV8_PMU_PMCR_N_MASK; 746 if (idx >= val && idx != ARMV8_PMU_CYCLE_IDX) { 747 kvm_inject_undefined(vcpu); 748 return false; 749 } 750 751 return true; 752 } 753 754 static bool access_pmu_evcntr(struct kvm_vcpu *vcpu, 755 struct sys_reg_params *p, 756 const struct sys_reg_desc *r) 757 { 758 u64 idx; 759 760 if (!kvm_arm_pmu_v3_ready(vcpu)) 761 return trap_raz_wi(vcpu, p, r); 762 763 if (r->CRn == 9 && r->CRm == 13) { 764 if (r->Op2 == 2) { 765 /* PMXEVCNTR_EL0 */ 766 if (pmu_access_event_counter_el0_disabled(vcpu)) 767 return false; 768 769 idx = __vcpu_sys_reg(vcpu, PMSELR_EL0) 770 & ARMV8_PMU_COUNTER_MASK; 771 } else if (r->Op2 == 0) { 772 /* PMCCNTR_EL0 */ 773 if (pmu_access_cycle_counter_el0_disabled(vcpu)) 774 return false; 775 776 idx = ARMV8_PMU_CYCLE_IDX; 777 } else { 778 return false; 779 } 780 } else if (r->CRn == 0 && r->CRm == 9) { 781 /* PMCCNTR */ 782 if (pmu_access_event_counter_el0_disabled(vcpu)) 783 return false; 784 785 idx = ARMV8_PMU_CYCLE_IDX; 786 } else if (r->CRn == 14 && (r->CRm & 12) == 8) { 787 /* PMEVCNTRn_EL0 */ 788 if (pmu_access_event_counter_el0_disabled(vcpu)) 789 return false; 790 791 idx = ((r->CRm & 3) << 3) | (r->Op2 & 7); 792 } else { 793 return false; 794 } 795 796 if (!pmu_counter_idx_valid(vcpu, idx)) 797 return false; 798 799 if (p->is_write) { 800 if (pmu_access_el0_disabled(vcpu)) 801 return false; 802 803 kvm_pmu_set_counter_value(vcpu, idx, p->regval); 804 } else { 805 p->regval = kvm_pmu_get_counter_value(vcpu, idx); 806 } 807 808 return true; 809 } 810 811 static bool access_pmu_evtyper(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 812 const struct sys_reg_desc *r) 813 { 814 u64 idx, reg; 815 816 if (!kvm_arm_pmu_v3_ready(vcpu)) 817 return trap_raz_wi(vcpu, p, r); 818 819 if (pmu_access_el0_disabled(vcpu)) 820 return false; 821 822 if (r->CRn == 9 && r->CRm == 13 && r->Op2 == 1) { 823 /* PMXEVTYPER_EL0 */ 824 idx = __vcpu_sys_reg(vcpu, PMSELR_EL0) & ARMV8_PMU_COUNTER_MASK; 825 reg = PMEVTYPER0_EL0 + idx; 826 } else if (r->CRn == 14 && (r->CRm & 12) == 12) { 827 idx = ((r->CRm & 3) << 3) | (r->Op2 & 7); 828 if (idx == ARMV8_PMU_CYCLE_IDX) 829 reg = PMCCFILTR_EL0; 830 else 831 /* PMEVTYPERn_EL0 */ 832 reg = PMEVTYPER0_EL0 + idx; 833 } else { 834 BUG(); 835 } 836 837 if (!pmu_counter_idx_valid(vcpu, idx)) 838 return false; 839 840 if (p->is_write) { 841 kvm_pmu_set_counter_event_type(vcpu, p->regval, idx); 842 __vcpu_sys_reg(vcpu, reg) = p->regval & ARMV8_PMU_EVTYPE_MASK; 843 kvm_vcpu_pmu_restore_guest(vcpu); 844 } else { 845 p->regval = __vcpu_sys_reg(vcpu, reg) & ARMV8_PMU_EVTYPE_MASK; 846 } 847 848 return true; 849 } 850 851 static bool access_pmcnten(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 852 const struct sys_reg_desc *r) 853 { 854 u64 val, mask; 855 856 if (!kvm_arm_pmu_v3_ready(vcpu)) 857 return trap_raz_wi(vcpu, p, r); 858 859 if (pmu_access_el0_disabled(vcpu)) 860 return false; 861 862 mask = kvm_pmu_valid_counter_mask(vcpu); 863 if (p->is_write) { 864 val = p->regval & mask; 865 if (r->Op2 & 0x1) { 866 /* accessing PMCNTENSET_EL0 */ 867 __vcpu_sys_reg(vcpu, PMCNTENSET_EL0) |= val; 868 kvm_pmu_enable_counter_mask(vcpu, val); 869 kvm_vcpu_pmu_restore_guest(vcpu); 870 } else { 871 /* accessing PMCNTENCLR_EL0 */ 872 __vcpu_sys_reg(vcpu, PMCNTENSET_EL0) &= ~val; 873 kvm_pmu_disable_counter_mask(vcpu, val); 874 } 875 } else { 876 p->regval = __vcpu_sys_reg(vcpu, PMCNTENSET_EL0) & mask; 877 } 878 879 return true; 880 } 881 882 static bool access_pminten(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 883 const struct sys_reg_desc *r) 884 { 885 u64 mask = kvm_pmu_valid_counter_mask(vcpu); 886 887 if (!kvm_arm_pmu_v3_ready(vcpu)) 888 return trap_raz_wi(vcpu, p, r); 889 890 if (!vcpu_mode_priv(vcpu)) { 891 kvm_inject_undefined(vcpu); 892 return false; 893 } 894 895 if (p->is_write) { 896 u64 val = p->regval & mask; 897 898 if (r->Op2 & 0x1) 899 /* accessing PMINTENSET_EL1 */ 900 __vcpu_sys_reg(vcpu, PMINTENSET_EL1) |= val; 901 else 902 /* accessing PMINTENCLR_EL1 */ 903 __vcpu_sys_reg(vcpu, PMINTENSET_EL1) &= ~val; 904 } else { 905 p->regval = __vcpu_sys_reg(vcpu, PMINTENSET_EL1) & mask; 906 } 907 908 return true; 909 } 910 911 static bool access_pmovs(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 912 const struct sys_reg_desc *r) 913 { 914 u64 mask = kvm_pmu_valid_counter_mask(vcpu); 915 916 if (!kvm_arm_pmu_v3_ready(vcpu)) 917 return trap_raz_wi(vcpu, p, r); 918 919 if (pmu_access_el0_disabled(vcpu)) 920 return false; 921 922 if (p->is_write) { 923 if (r->CRm & 0x2) 924 /* accessing PMOVSSET_EL0 */ 925 __vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= (p->regval & mask); 926 else 927 /* accessing PMOVSCLR_EL0 */ 928 __vcpu_sys_reg(vcpu, PMOVSSET_EL0) &= ~(p->regval & mask); 929 } else { 930 p->regval = __vcpu_sys_reg(vcpu, PMOVSSET_EL0) & mask; 931 } 932 933 return true; 934 } 935 936 static bool access_pmswinc(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 937 const struct sys_reg_desc *r) 938 { 939 u64 mask; 940 941 if (!kvm_arm_pmu_v3_ready(vcpu)) 942 return trap_raz_wi(vcpu, p, r); 943 944 if (!p->is_write) 945 return read_from_write_only(vcpu, p, r); 946 947 if (pmu_write_swinc_el0_disabled(vcpu)) 948 return false; 949 950 mask = kvm_pmu_valid_counter_mask(vcpu); 951 kvm_pmu_software_increment(vcpu, p->regval & mask); 952 return true; 953 } 954 955 static bool access_pmuserenr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 956 const struct sys_reg_desc *r) 957 { 958 if (!kvm_arm_pmu_v3_ready(vcpu)) 959 return trap_raz_wi(vcpu, p, r); 960 961 if (p->is_write) { 962 if (!vcpu_mode_priv(vcpu)) { 963 kvm_inject_undefined(vcpu); 964 return false; 965 } 966 967 __vcpu_sys_reg(vcpu, PMUSERENR_EL0) = 968 p->regval & ARMV8_PMU_USERENR_MASK; 969 } else { 970 p->regval = __vcpu_sys_reg(vcpu, PMUSERENR_EL0) 971 & ARMV8_PMU_USERENR_MASK; 972 } 973 974 return true; 975 } 976 977 #define reg_to_encoding(x) \ 978 sys_reg((u32)(x)->Op0, (u32)(x)->Op1, \ 979 (u32)(x)->CRn, (u32)(x)->CRm, (u32)(x)->Op2); 980 981 /* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go */ 982 #define DBG_BCR_BVR_WCR_WVR_EL1(n) \ 983 { SYS_DESC(SYS_DBGBVRn_EL1(n)), \ 984 trap_bvr, reset_bvr, 0, 0, get_bvr, set_bvr }, \ 985 { SYS_DESC(SYS_DBGBCRn_EL1(n)), \ 986 trap_bcr, reset_bcr, 0, 0, get_bcr, set_bcr }, \ 987 { SYS_DESC(SYS_DBGWVRn_EL1(n)), \ 988 trap_wvr, reset_wvr, 0, 0, get_wvr, set_wvr }, \ 989 { SYS_DESC(SYS_DBGWCRn_EL1(n)), \ 990 trap_wcr, reset_wcr, 0, 0, get_wcr, set_wcr } 991 992 /* Macro to expand the PMEVCNTRn_EL0 register */ 993 #define PMU_PMEVCNTR_EL0(n) \ 994 { SYS_DESC(SYS_PMEVCNTRn_EL0(n)), \ 995 access_pmu_evcntr, reset_unknown, (PMEVCNTR0_EL0 + n), } 996 997 /* Macro to expand the PMEVTYPERn_EL0 register */ 998 #define PMU_PMEVTYPER_EL0(n) \ 999 { SYS_DESC(SYS_PMEVTYPERn_EL0(n)), \ 1000 access_pmu_evtyper, reset_unknown, (PMEVTYPER0_EL0 + n), } 1001 1002 static bool trap_ptrauth(struct kvm_vcpu *vcpu, 1003 struct sys_reg_params *p, 1004 const struct sys_reg_desc *rd) 1005 { 1006 kvm_arm_vcpu_ptrauth_trap(vcpu); 1007 1008 /* 1009 * Return false for both cases as we never skip the trapped 1010 * instruction: 1011 * 1012 * - Either we re-execute the same key register access instruction 1013 * after enabling ptrauth. 1014 * - Or an UNDEF is injected as ptrauth is not supported/enabled. 1015 */ 1016 return false; 1017 } 1018 1019 static unsigned int ptrauth_visibility(const struct kvm_vcpu *vcpu, 1020 const struct sys_reg_desc *rd) 1021 { 1022 return vcpu_has_ptrauth(vcpu) ? 0 : REG_HIDDEN_USER | REG_HIDDEN_GUEST; 1023 } 1024 1025 #define __PTRAUTH_KEY(k) \ 1026 { SYS_DESC(SYS_## k), trap_ptrauth, reset_unknown, k, \ 1027 .visibility = ptrauth_visibility} 1028 1029 #define PTRAUTH_KEY(k) \ 1030 __PTRAUTH_KEY(k ## KEYLO_EL1), \ 1031 __PTRAUTH_KEY(k ## KEYHI_EL1) 1032 1033 static bool access_arch_timer(struct kvm_vcpu *vcpu, 1034 struct sys_reg_params *p, 1035 const struct sys_reg_desc *r) 1036 { 1037 enum kvm_arch_timers tmr; 1038 enum kvm_arch_timer_regs treg; 1039 u64 reg = reg_to_encoding(r); 1040 1041 switch (reg) { 1042 case SYS_CNTP_TVAL_EL0: 1043 case SYS_AARCH32_CNTP_TVAL: 1044 tmr = TIMER_PTIMER; 1045 treg = TIMER_REG_TVAL; 1046 break; 1047 case SYS_CNTP_CTL_EL0: 1048 case SYS_AARCH32_CNTP_CTL: 1049 tmr = TIMER_PTIMER; 1050 treg = TIMER_REG_CTL; 1051 break; 1052 case SYS_CNTP_CVAL_EL0: 1053 case SYS_AARCH32_CNTP_CVAL: 1054 tmr = TIMER_PTIMER; 1055 treg = TIMER_REG_CVAL; 1056 break; 1057 default: 1058 BUG(); 1059 } 1060 1061 if (p->is_write) 1062 kvm_arm_timer_write_sysreg(vcpu, tmr, treg, p->regval); 1063 else 1064 p->regval = kvm_arm_timer_read_sysreg(vcpu, tmr, treg); 1065 1066 return true; 1067 } 1068 1069 /* Read a sanitised cpufeature ID register by sys_reg_desc */ 1070 static u64 read_id_reg(const struct kvm_vcpu *vcpu, 1071 struct sys_reg_desc const *r, bool raz) 1072 { 1073 u32 id = sys_reg((u32)r->Op0, (u32)r->Op1, 1074 (u32)r->CRn, (u32)r->CRm, (u32)r->Op2); 1075 u64 val = raz ? 0 : read_sanitised_ftr_reg(id); 1076 1077 if (id == SYS_ID_AA64PFR0_EL1 && !vcpu_has_sve(vcpu)) { 1078 val &= ~(0xfUL << ID_AA64PFR0_SVE_SHIFT); 1079 } else if (id == SYS_ID_AA64ISAR1_EL1 && !vcpu_has_ptrauth(vcpu)) { 1080 val &= ~((0xfUL << ID_AA64ISAR1_APA_SHIFT) | 1081 (0xfUL << ID_AA64ISAR1_API_SHIFT) | 1082 (0xfUL << ID_AA64ISAR1_GPA_SHIFT) | 1083 (0xfUL << ID_AA64ISAR1_GPI_SHIFT)); 1084 } 1085 1086 return val; 1087 } 1088 1089 /* cpufeature ID register access trap handlers */ 1090 1091 static bool __access_id_reg(struct kvm_vcpu *vcpu, 1092 struct sys_reg_params *p, 1093 const struct sys_reg_desc *r, 1094 bool raz) 1095 { 1096 if (p->is_write) 1097 return write_to_read_only(vcpu, p, r); 1098 1099 p->regval = read_id_reg(vcpu, r, raz); 1100 return true; 1101 } 1102 1103 static bool access_id_reg(struct kvm_vcpu *vcpu, 1104 struct sys_reg_params *p, 1105 const struct sys_reg_desc *r) 1106 { 1107 return __access_id_reg(vcpu, p, r, false); 1108 } 1109 1110 static bool access_raz_id_reg(struct kvm_vcpu *vcpu, 1111 struct sys_reg_params *p, 1112 const struct sys_reg_desc *r) 1113 { 1114 return __access_id_reg(vcpu, p, r, true); 1115 } 1116 1117 static int reg_from_user(u64 *val, const void __user *uaddr, u64 id); 1118 static int reg_to_user(void __user *uaddr, const u64 *val, u64 id); 1119 static u64 sys_reg_to_index(const struct sys_reg_desc *reg); 1120 1121 /* Visibility overrides for SVE-specific control registers */ 1122 static unsigned int sve_visibility(const struct kvm_vcpu *vcpu, 1123 const struct sys_reg_desc *rd) 1124 { 1125 if (vcpu_has_sve(vcpu)) 1126 return 0; 1127 1128 return REG_HIDDEN_USER | REG_HIDDEN_GUEST; 1129 } 1130 1131 /* Visibility overrides for SVE-specific ID registers */ 1132 static unsigned int sve_id_visibility(const struct kvm_vcpu *vcpu, 1133 const struct sys_reg_desc *rd) 1134 { 1135 if (vcpu_has_sve(vcpu)) 1136 return 0; 1137 1138 return REG_HIDDEN_USER; 1139 } 1140 1141 /* Generate the emulated ID_AA64ZFR0_EL1 value exposed to the guest */ 1142 static u64 guest_id_aa64zfr0_el1(const struct kvm_vcpu *vcpu) 1143 { 1144 if (!vcpu_has_sve(vcpu)) 1145 return 0; 1146 1147 return read_sanitised_ftr_reg(SYS_ID_AA64ZFR0_EL1); 1148 } 1149 1150 static bool access_id_aa64zfr0_el1(struct kvm_vcpu *vcpu, 1151 struct sys_reg_params *p, 1152 const struct sys_reg_desc *rd) 1153 { 1154 if (p->is_write) 1155 return write_to_read_only(vcpu, p, rd); 1156 1157 p->regval = guest_id_aa64zfr0_el1(vcpu); 1158 return true; 1159 } 1160 1161 static int get_id_aa64zfr0_el1(struct kvm_vcpu *vcpu, 1162 const struct sys_reg_desc *rd, 1163 const struct kvm_one_reg *reg, void __user *uaddr) 1164 { 1165 u64 val; 1166 1167 if (WARN_ON(!vcpu_has_sve(vcpu))) 1168 return -ENOENT; 1169 1170 val = guest_id_aa64zfr0_el1(vcpu); 1171 return reg_to_user(uaddr, &val, reg->id); 1172 } 1173 1174 static int set_id_aa64zfr0_el1(struct kvm_vcpu *vcpu, 1175 const struct sys_reg_desc *rd, 1176 const struct kvm_one_reg *reg, void __user *uaddr) 1177 { 1178 const u64 id = sys_reg_to_index(rd); 1179 int err; 1180 u64 val; 1181 1182 if (WARN_ON(!vcpu_has_sve(vcpu))) 1183 return -ENOENT; 1184 1185 err = reg_from_user(&val, uaddr, id); 1186 if (err) 1187 return err; 1188 1189 /* This is what we mean by invariant: you can't change it. */ 1190 if (val != guest_id_aa64zfr0_el1(vcpu)) 1191 return -EINVAL; 1192 1193 return 0; 1194 } 1195 1196 /* 1197 * cpufeature ID register user accessors 1198 * 1199 * For now, these registers are immutable for userspace, so no values 1200 * are stored, and for set_id_reg() we don't allow the effective value 1201 * to be changed. 1202 */ 1203 static int __get_id_reg(const struct kvm_vcpu *vcpu, 1204 const struct sys_reg_desc *rd, void __user *uaddr, 1205 bool raz) 1206 { 1207 const u64 id = sys_reg_to_index(rd); 1208 const u64 val = read_id_reg(vcpu, rd, raz); 1209 1210 return reg_to_user(uaddr, &val, id); 1211 } 1212 1213 static int __set_id_reg(const struct kvm_vcpu *vcpu, 1214 const struct sys_reg_desc *rd, void __user *uaddr, 1215 bool raz) 1216 { 1217 const u64 id = sys_reg_to_index(rd); 1218 int err; 1219 u64 val; 1220 1221 err = reg_from_user(&val, uaddr, id); 1222 if (err) 1223 return err; 1224 1225 /* This is what we mean by invariant: you can't change it. */ 1226 if (val != read_id_reg(vcpu, rd, raz)) 1227 return -EINVAL; 1228 1229 return 0; 1230 } 1231 1232 static int get_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 1233 const struct kvm_one_reg *reg, void __user *uaddr) 1234 { 1235 return __get_id_reg(vcpu, rd, uaddr, false); 1236 } 1237 1238 static int set_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 1239 const struct kvm_one_reg *reg, void __user *uaddr) 1240 { 1241 return __set_id_reg(vcpu, rd, uaddr, false); 1242 } 1243 1244 static int get_raz_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 1245 const struct kvm_one_reg *reg, void __user *uaddr) 1246 { 1247 return __get_id_reg(vcpu, rd, uaddr, true); 1248 } 1249 1250 static int set_raz_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 1251 const struct kvm_one_reg *reg, void __user *uaddr) 1252 { 1253 return __set_id_reg(vcpu, rd, uaddr, true); 1254 } 1255 1256 static bool access_ctr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1257 const struct sys_reg_desc *r) 1258 { 1259 if (p->is_write) 1260 return write_to_read_only(vcpu, p, r); 1261 1262 p->regval = read_sanitised_ftr_reg(SYS_CTR_EL0); 1263 return true; 1264 } 1265 1266 static bool access_clidr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1267 const struct sys_reg_desc *r) 1268 { 1269 if (p->is_write) 1270 return write_to_read_only(vcpu, p, r); 1271 1272 p->regval = read_sysreg(clidr_el1); 1273 return true; 1274 } 1275 1276 static bool access_csselr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1277 const struct sys_reg_desc *r) 1278 { 1279 if (p->is_write) 1280 vcpu_write_sys_reg(vcpu, p->regval, r->reg); 1281 else 1282 p->regval = vcpu_read_sys_reg(vcpu, r->reg); 1283 return true; 1284 } 1285 1286 static bool access_ccsidr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 1287 const struct sys_reg_desc *r) 1288 { 1289 u32 csselr; 1290 1291 if (p->is_write) 1292 return write_to_read_only(vcpu, p, r); 1293 1294 csselr = vcpu_read_sys_reg(vcpu, CSSELR_EL1); 1295 p->regval = get_ccsidr(csselr); 1296 1297 /* 1298 * Guests should not be doing cache operations by set/way at all, and 1299 * for this reason, we trap them and attempt to infer the intent, so 1300 * that we can flush the entire guest's address space at the appropriate 1301 * time. 1302 * To prevent this trapping from causing performance problems, let's 1303 * expose the geometry of all data and unified caches (which are 1304 * guaranteed to be PIPT and thus non-aliasing) as 1 set and 1 way. 1305 * [If guests should attempt to infer aliasing properties from the 1306 * geometry (which is not permitted by the architecture), they would 1307 * only do so for virtually indexed caches.] 1308 */ 1309 if (!(csselr & 1)) // data or unified cache 1310 p->regval &= ~GENMASK(27, 3); 1311 return true; 1312 } 1313 1314 /* sys_reg_desc initialiser for known cpufeature ID registers */ 1315 #define ID_SANITISED(name) { \ 1316 SYS_DESC(SYS_##name), \ 1317 .access = access_id_reg, \ 1318 .get_user = get_id_reg, \ 1319 .set_user = set_id_reg, \ 1320 } 1321 1322 /* 1323 * sys_reg_desc initialiser for architecturally unallocated cpufeature ID 1324 * register with encoding Op0=3, Op1=0, CRn=0, CRm=crm, Op2=op2 1325 * (1 <= crm < 8, 0 <= Op2 < 8). 1326 */ 1327 #define ID_UNALLOCATED(crm, op2) { \ 1328 Op0(3), Op1(0), CRn(0), CRm(crm), Op2(op2), \ 1329 .access = access_raz_id_reg, \ 1330 .get_user = get_raz_id_reg, \ 1331 .set_user = set_raz_id_reg, \ 1332 } 1333 1334 /* 1335 * sys_reg_desc initialiser for known ID registers that we hide from guests. 1336 * For now, these are exposed just like unallocated ID regs: they appear 1337 * RAZ for the guest. 1338 */ 1339 #define ID_HIDDEN(name) { \ 1340 SYS_DESC(SYS_##name), \ 1341 .access = access_raz_id_reg, \ 1342 .get_user = get_raz_id_reg, \ 1343 .set_user = set_raz_id_reg, \ 1344 } 1345 1346 /* 1347 * Architected system registers. 1348 * Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2 1349 * 1350 * Debug handling: We do trap most, if not all debug related system 1351 * registers. The implementation is good enough to ensure that a guest 1352 * can use these with minimal performance degradation. The drawback is 1353 * that we don't implement any of the external debug, none of the 1354 * OSlock protocol. This should be revisited if we ever encounter a 1355 * more demanding guest... 1356 */ 1357 static const struct sys_reg_desc sys_reg_descs[] = { 1358 { SYS_DESC(SYS_DC_ISW), access_dcsw }, 1359 { SYS_DESC(SYS_DC_CSW), access_dcsw }, 1360 { SYS_DESC(SYS_DC_CISW), access_dcsw }, 1361 1362 DBG_BCR_BVR_WCR_WVR_EL1(0), 1363 DBG_BCR_BVR_WCR_WVR_EL1(1), 1364 { SYS_DESC(SYS_MDCCINT_EL1), trap_debug_regs, reset_val, MDCCINT_EL1, 0 }, 1365 { SYS_DESC(SYS_MDSCR_EL1), trap_debug_regs, reset_val, MDSCR_EL1, 0 }, 1366 DBG_BCR_BVR_WCR_WVR_EL1(2), 1367 DBG_BCR_BVR_WCR_WVR_EL1(3), 1368 DBG_BCR_BVR_WCR_WVR_EL1(4), 1369 DBG_BCR_BVR_WCR_WVR_EL1(5), 1370 DBG_BCR_BVR_WCR_WVR_EL1(6), 1371 DBG_BCR_BVR_WCR_WVR_EL1(7), 1372 DBG_BCR_BVR_WCR_WVR_EL1(8), 1373 DBG_BCR_BVR_WCR_WVR_EL1(9), 1374 DBG_BCR_BVR_WCR_WVR_EL1(10), 1375 DBG_BCR_BVR_WCR_WVR_EL1(11), 1376 DBG_BCR_BVR_WCR_WVR_EL1(12), 1377 DBG_BCR_BVR_WCR_WVR_EL1(13), 1378 DBG_BCR_BVR_WCR_WVR_EL1(14), 1379 DBG_BCR_BVR_WCR_WVR_EL1(15), 1380 1381 { SYS_DESC(SYS_MDRAR_EL1), trap_raz_wi }, 1382 { SYS_DESC(SYS_OSLAR_EL1), trap_raz_wi }, 1383 { SYS_DESC(SYS_OSLSR_EL1), trap_oslsr_el1 }, 1384 { SYS_DESC(SYS_OSDLR_EL1), trap_raz_wi }, 1385 { SYS_DESC(SYS_DBGPRCR_EL1), trap_raz_wi }, 1386 { SYS_DESC(SYS_DBGCLAIMSET_EL1), trap_raz_wi }, 1387 { SYS_DESC(SYS_DBGCLAIMCLR_EL1), trap_raz_wi }, 1388 { SYS_DESC(SYS_DBGAUTHSTATUS_EL1), trap_dbgauthstatus_el1 }, 1389 1390 { SYS_DESC(SYS_MDCCSR_EL0), trap_raz_wi }, 1391 { SYS_DESC(SYS_DBGDTR_EL0), trap_raz_wi }, 1392 // DBGDTR[TR]X_EL0 share the same encoding 1393 { SYS_DESC(SYS_DBGDTRTX_EL0), trap_raz_wi }, 1394 1395 { SYS_DESC(SYS_DBGVCR32_EL2), NULL, reset_val, DBGVCR32_EL2, 0 }, 1396 1397 { SYS_DESC(SYS_MPIDR_EL1), NULL, reset_mpidr, MPIDR_EL1 }, 1398 1399 /* 1400 * ID regs: all ID_SANITISED() entries here must have corresponding 1401 * entries in arm64_ftr_regs[]. 1402 */ 1403 1404 /* AArch64 mappings of the AArch32 ID registers */ 1405 /* CRm=1 */ 1406 ID_SANITISED(ID_PFR0_EL1), 1407 ID_SANITISED(ID_PFR1_EL1), 1408 ID_SANITISED(ID_DFR0_EL1), 1409 ID_HIDDEN(ID_AFR0_EL1), 1410 ID_SANITISED(ID_MMFR0_EL1), 1411 ID_SANITISED(ID_MMFR1_EL1), 1412 ID_SANITISED(ID_MMFR2_EL1), 1413 ID_SANITISED(ID_MMFR3_EL1), 1414 1415 /* CRm=2 */ 1416 ID_SANITISED(ID_ISAR0_EL1), 1417 ID_SANITISED(ID_ISAR1_EL1), 1418 ID_SANITISED(ID_ISAR2_EL1), 1419 ID_SANITISED(ID_ISAR3_EL1), 1420 ID_SANITISED(ID_ISAR4_EL1), 1421 ID_SANITISED(ID_ISAR5_EL1), 1422 ID_SANITISED(ID_MMFR4_EL1), 1423 ID_UNALLOCATED(2,7), 1424 1425 /* CRm=3 */ 1426 ID_SANITISED(MVFR0_EL1), 1427 ID_SANITISED(MVFR1_EL1), 1428 ID_SANITISED(MVFR2_EL1), 1429 ID_UNALLOCATED(3,3), 1430 ID_UNALLOCATED(3,4), 1431 ID_UNALLOCATED(3,5), 1432 ID_UNALLOCATED(3,6), 1433 ID_UNALLOCATED(3,7), 1434 1435 /* AArch64 ID registers */ 1436 /* CRm=4 */ 1437 ID_SANITISED(ID_AA64PFR0_EL1), 1438 ID_SANITISED(ID_AA64PFR1_EL1), 1439 ID_UNALLOCATED(4,2), 1440 ID_UNALLOCATED(4,3), 1441 { SYS_DESC(SYS_ID_AA64ZFR0_EL1), access_id_aa64zfr0_el1, .get_user = get_id_aa64zfr0_el1, .set_user = set_id_aa64zfr0_el1, .visibility = sve_id_visibility }, 1442 ID_UNALLOCATED(4,5), 1443 ID_UNALLOCATED(4,6), 1444 ID_UNALLOCATED(4,7), 1445 1446 /* CRm=5 */ 1447 ID_SANITISED(ID_AA64DFR0_EL1), 1448 ID_SANITISED(ID_AA64DFR1_EL1), 1449 ID_UNALLOCATED(5,2), 1450 ID_UNALLOCATED(5,3), 1451 ID_HIDDEN(ID_AA64AFR0_EL1), 1452 ID_HIDDEN(ID_AA64AFR1_EL1), 1453 ID_UNALLOCATED(5,6), 1454 ID_UNALLOCATED(5,7), 1455 1456 /* CRm=6 */ 1457 ID_SANITISED(ID_AA64ISAR0_EL1), 1458 ID_SANITISED(ID_AA64ISAR1_EL1), 1459 ID_UNALLOCATED(6,2), 1460 ID_UNALLOCATED(6,3), 1461 ID_UNALLOCATED(6,4), 1462 ID_UNALLOCATED(6,5), 1463 ID_UNALLOCATED(6,6), 1464 ID_UNALLOCATED(6,7), 1465 1466 /* CRm=7 */ 1467 ID_SANITISED(ID_AA64MMFR0_EL1), 1468 ID_SANITISED(ID_AA64MMFR1_EL1), 1469 ID_SANITISED(ID_AA64MMFR2_EL1), 1470 ID_UNALLOCATED(7,3), 1471 ID_UNALLOCATED(7,4), 1472 ID_UNALLOCATED(7,5), 1473 ID_UNALLOCATED(7,6), 1474 ID_UNALLOCATED(7,7), 1475 1476 { SYS_DESC(SYS_SCTLR_EL1), access_vm_reg, reset_val, SCTLR_EL1, 0x00C50078 }, 1477 { SYS_DESC(SYS_CPACR_EL1), NULL, reset_val, CPACR_EL1, 0 }, 1478 { SYS_DESC(SYS_ZCR_EL1), NULL, reset_val, ZCR_EL1, 0, .visibility = sve_visibility }, 1479 { SYS_DESC(SYS_TTBR0_EL1), access_vm_reg, reset_unknown, TTBR0_EL1 }, 1480 { SYS_DESC(SYS_TTBR1_EL1), access_vm_reg, reset_unknown, TTBR1_EL1 }, 1481 { SYS_DESC(SYS_TCR_EL1), access_vm_reg, reset_val, TCR_EL1, 0 }, 1482 1483 PTRAUTH_KEY(APIA), 1484 PTRAUTH_KEY(APIB), 1485 PTRAUTH_KEY(APDA), 1486 PTRAUTH_KEY(APDB), 1487 PTRAUTH_KEY(APGA), 1488 1489 { SYS_DESC(SYS_AFSR0_EL1), access_vm_reg, reset_unknown, AFSR0_EL1 }, 1490 { SYS_DESC(SYS_AFSR1_EL1), access_vm_reg, reset_unknown, AFSR1_EL1 }, 1491 { SYS_DESC(SYS_ESR_EL1), access_vm_reg, reset_unknown, ESR_EL1 }, 1492 1493 { SYS_DESC(SYS_ERRIDR_EL1), trap_raz_wi }, 1494 { SYS_DESC(SYS_ERRSELR_EL1), trap_raz_wi }, 1495 { SYS_DESC(SYS_ERXFR_EL1), trap_raz_wi }, 1496 { SYS_DESC(SYS_ERXCTLR_EL1), trap_raz_wi }, 1497 { SYS_DESC(SYS_ERXSTATUS_EL1), trap_raz_wi }, 1498 { SYS_DESC(SYS_ERXADDR_EL1), trap_raz_wi }, 1499 { SYS_DESC(SYS_ERXMISC0_EL1), trap_raz_wi }, 1500 { SYS_DESC(SYS_ERXMISC1_EL1), trap_raz_wi }, 1501 1502 { SYS_DESC(SYS_FAR_EL1), access_vm_reg, reset_unknown, FAR_EL1 }, 1503 { SYS_DESC(SYS_PAR_EL1), NULL, reset_unknown, PAR_EL1 }, 1504 1505 { SYS_DESC(SYS_PMINTENSET_EL1), access_pminten, reset_unknown, PMINTENSET_EL1 }, 1506 { SYS_DESC(SYS_PMINTENCLR_EL1), access_pminten, NULL, PMINTENSET_EL1 }, 1507 1508 { SYS_DESC(SYS_MAIR_EL1), access_vm_reg, reset_unknown, MAIR_EL1 }, 1509 { SYS_DESC(SYS_AMAIR_EL1), access_vm_reg, reset_amair_el1, AMAIR_EL1 }, 1510 1511 { SYS_DESC(SYS_LORSA_EL1), trap_loregion }, 1512 { SYS_DESC(SYS_LOREA_EL1), trap_loregion }, 1513 { SYS_DESC(SYS_LORN_EL1), trap_loregion }, 1514 { SYS_DESC(SYS_LORC_EL1), trap_loregion }, 1515 { SYS_DESC(SYS_LORID_EL1), trap_loregion }, 1516 1517 { SYS_DESC(SYS_VBAR_EL1), NULL, reset_val, VBAR_EL1, 0 }, 1518 { SYS_DESC(SYS_DISR_EL1), NULL, reset_val, DISR_EL1, 0 }, 1519 1520 { SYS_DESC(SYS_ICC_IAR0_EL1), write_to_read_only }, 1521 { SYS_DESC(SYS_ICC_EOIR0_EL1), read_from_write_only }, 1522 { SYS_DESC(SYS_ICC_HPPIR0_EL1), write_to_read_only }, 1523 { SYS_DESC(SYS_ICC_DIR_EL1), read_from_write_only }, 1524 { SYS_DESC(SYS_ICC_RPR_EL1), write_to_read_only }, 1525 { SYS_DESC(SYS_ICC_SGI1R_EL1), access_gic_sgi }, 1526 { SYS_DESC(SYS_ICC_ASGI1R_EL1), access_gic_sgi }, 1527 { SYS_DESC(SYS_ICC_SGI0R_EL1), access_gic_sgi }, 1528 { SYS_DESC(SYS_ICC_IAR1_EL1), write_to_read_only }, 1529 { SYS_DESC(SYS_ICC_EOIR1_EL1), read_from_write_only }, 1530 { SYS_DESC(SYS_ICC_HPPIR1_EL1), write_to_read_only }, 1531 { SYS_DESC(SYS_ICC_SRE_EL1), access_gic_sre }, 1532 1533 { SYS_DESC(SYS_CONTEXTIDR_EL1), access_vm_reg, reset_val, CONTEXTIDR_EL1, 0 }, 1534 { SYS_DESC(SYS_TPIDR_EL1), NULL, reset_unknown, TPIDR_EL1 }, 1535 1536 { SYS_DESC(SYS_CNTKCTL_EL1), NULL, reset_val, CNTKCTL_EL1, 0}, 1537 1538 { SYS_DESC(SYS_CCSIDR_EL1), access_ccsidr }, 1539 { SYS_DESC(SYS_CLIDR_EL1), access_clidr }, 1540 { SYS_DESC(SYS_CSSELR_EL1), access_csselr, reset_unknown, CSSELR_EL1 }, 1541 { SYS_DESC(SYS_CTR_EL0), access_ctr }, 1542 1543 { SYS_DESC(SYS_PMCR_EL0), access_pmcr, reset_pmcr, PMCR_EL0 }, 1544 { SYS_DESC(SYS_PMCNTENSET_EL0), access_pmcnten, reset_unknown, PMCNTENSET_EL0 }, 1545 { SYS_DESC(SYS_PMCNTENCLR_EL0), access_pmcnten, NULL, PMCNTENSET_EL0 }, 1546 { SYS_DESC(SYS_PMOVSCLR_EL0), access_pmovs, NULL, PMOVSSET_EL0 }, 1547 { SYS_DESC(SYS_PMSWINC_EL0), access_pmswinc, reset_unknown, PMSWINC_EL0 }, 1548 { SYS_DESC(SYS_PMSELR_EL0), access_pmselr, reset_unknown, PMSELR_EL0 }, 1549 { SYS_DESC(SYS_PMCEID0_EL0), access_pmceid }, 1550 { SYS_DESC(SYS_PMCEID1_EL0), access_pmceid }, 1551 { SYS_DESC(SYS_PMCCNTR_EL0), access_pmu_evcntr, reset_unknown, PMCCNTR_EL0 }, 1552 { SYS_DESC(SYS_PMXEVTYPER_EL0), access_pmu_evtyper }, 1553 { SYS_DESC(SYS_PMXEVCNTR_EL0), access_pmu_evcntr }, 1554 /* 1555 * PMUSERENR_EL0 resets as unknown in 64bit mode while it resets as zero 1556 * in 32bit mode. Here we choose to reset it as zero for consistency. 1557 */ 1558 { SYS_DESC(SYS_PMUSERENR_EL0), access_pmuserenr, reset_val, PMUSERENR_EL0, 0 }, 1559 { SYS_DESC(SYS_PMOVSSET_EL0), access_pmovs, reset_unknown, PMOVSSET_EL0 }, 1560 1561 { SYS_DESC(SYS_TPIDR_EL0), NULL, reset_unknown, TPIDR_EL0 }, 1562 { SYS_DESC(SYS_TPIDRRO_EL0), NULL, reset_unknown, TPIDRRO_EL0 }, 1563 1564 { SYS_DESC(SYS_CNTP_TVAL_EL0), access_arch_timer }, 1565 { SYS_DESC(SYS_CNTP_CTL_EL0), access_arch_timer }, 1566 { SYS_DESC(SYS_CNTP_CVAL_EL0), access_arch_timer }, 1567 1568 /* PMEVCNTRn_EL0 */ 1569 PMU_PMEVCNTR_EL0(0), 1570 PMU_PMEVCNTR_EL0(1), 1571 PMU_PMEVCNTR_EL0(2), 1572 PMU_PMEVCNTR_EL0(3), 1573 PMU_PMEVCNTR_EL0(4), 1574 PMU_PMEVCNTR_EL0(5), 1575 PMU_PMEVCNTR_EL0(6), 1576 PMU_PMEVCNTR_EL0(7), 1577 PMU_PMEVCNTR_EL0(8), 1578 PMU_PMEVCNTR_EL0(9), 1579 PMU_PMEVCNTR_EL0(10), 1580 PMU_PMEVCNTR_EL0(11), 1581 PMU_PMEVCNTR_EL0(12), 1582 PMU_PMEVCNTR_EL0(13), 1583 PMU_PMEVCNTR_EL0(14), 1584 PMU_PMEVCNTR_EL0(15), 1585 PMU_PMEVCNTR_EL0(16), 1586 PMU_PMEVCNTR_EL0(17), 1587 PMU_PMEVCNTR_EL0(18), 1588 PMU_PMEVCNTR_EL0(19), 1589 PMU_PMEVCNTR_EL0(20), 1590 PMU_PMEVCNTR_EL0(21), 1591 PMU_PMEVCNTR_EL0(22), 1592 PMU_PMEVCNTR_EL0(23), 1593 PMU_PMEVCNTR_EL0(24), 1594 PMU_PMEVCNTR_EL0(25), 1595 PMU_PMEVCNTR_EL0(26), 1596 PMU_PMEVCNTR_EL0(27), 1597 PMU_PMEVCNTR_EL0(28), 1598 PMU_PMEVCNTR_EL0(29), 1599 PMU_PMEVCNTR_EL0(30), 1600 /* PMEVTYPERn_EL0 */ 1601 PMU_PMEVTYPER_EL0(0), 1602 PMU_PMEVTYPER_EL0(1), 1603 PMU_PMEVTYPER_EL0(2), 1604 PMU_PMEVTYPER_EL0(3), 1605 PMU_PMEVTYPER_EL0(4), 1606 PMU_PMEVTYPER_EL0(5), 1607 PMU_PMEVTYPER_EL0(6), 1608 PMU_PMEVTYPER_EL0(7), 1609 PMU_PMEVTYPER_EL0(8), 1610 PMU_PMEVTYPER_EL0(9), 1611 PMU_PMEVTYPER_EL0(10), 1612 PMU_PMEVTYPER_EL0(11), 1613 PMU_PMEVTYPER_EL0(12), 1614 PMU_PMEVTYPER_EL0(13), 1615 PMU_PMEVTYPER_EL0(14), 1616 PMU_PMEVTYPER_EL0(15), 1617 PMU_PMEVTYPER_EL0(16), 1618 PMU_PMEVTYPER_EL0(17), 1619 PMU_PMEVTYPER_EL0(18), 1620 PMU_PMEVTYPER_EL0(19), 1621 PMU_PMEVTYPER_EL0(20), 1622 PMU_PMEVTYPER_EL0(21), 1623 PMU_PMEVTYPER_EL0(22), 1624 PMU_PMEVTYPER_EL0(23), 1625 PMU_PMEVTYPER_EL0(24), 1626 PMU_PMEVTYPER_EL0(25), 1627 PMU_PMEVTYPER_EL0(26), 1628 PMU_PMEVTYPER_EL0(27), 1629 PMU_PMEVTYPER_EL0(28), 1630 PMU_PMEVTYPER_EL0(29), 1631 PMU_PMEVTYPER_EL0(30), 1632 /* 1633 * PMCCFILTR_EL0 resets as unknown in 64bit mode while it resets as zero 1634 * in 32bit mode. Here we choose to reset it as zero for consistency. 1635 */ 1636 { SYS_DESC(SYS_PMCCFILTR_EL0), access_pmu_evtyper, reset_val, PMCCFILTR_EL0, 0 }, 1637 1638 { SYS_DESC(SYS_DACR32_EL2), NULL, reset_unknown, DACR32_EL2 }, 1639 { SYS_DESC(SYS_IFSR32_EL2), NULL, reset_unknown, IFSR32_EL2 }, 1640 { SYS_DESC(SYS_FPEXC32_EL2), NULL, reset_val, FPEXC32_EL2, 0x700 }, 1641 }; 1642 1643 static bool trap_dbgidr(struct kvm_vcpu *vcpu, 1644 struct sys_reg_params *p, 1645 const struct sys_reg_desc *r) 1646 { 1647 if (p->is_write) { 1648 return ignore_write(vcpu, p); 1649 } else { 1650 u64 dfr = read_sanitised_ftr_reg(SYS_ID_AA64DFR0_EL1); 1651 u64 pfr = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1); 1652 u32 el3 = !!cpuid_feature_extract_unsigned_field(pfr, ID_AA64PFR0_EL3_SHIFT); 1653 1654 p->regval = ((((dfr >> ID_AA64DFR0_WRPS_SHIFT) & 0xf) << 28) | 1655 (((dfr >> ID_AA64DFR0_BRPS_SHIFT) & 0xf) << 24) | 1656 (((dfr >> ID_AA64DFR0_CTX_CMPS_SHIFT) & 0xf) << 20) 1657 | (6 << 16) | (el3 << 14) | (el3 << 12)); 1658 return true; 1659 } 1660 } 1661 1662 static bool trap_debug32(struct kvm_vcpu *vcpu, 1663 struct sys_reg_params *p, 1664 const struct sys_reg_desc *r) 1665 { 1666 if (p->is_write) { 1667 vcpu_cp14(vcpu, r->reg) = p->regval; 1668 vcpu->arch.flags |= KVM_ARM64_DEBUG_DIRTY; 1669 } else { 1670 p->regval = vcpu_cp14(vcpu, r->reg); 1671 } 1672 1673 return true; 1674 } 1675 1676 /* AArch32 debug register mappings 1677 * 1678 * AArch32 DBGBVRn is mapped to DBGBVRn_EL1[31:0] 1679 * AArch32 DBGBXVRn is mapped to DBGBVRn_EL1[63:32] 1680 * 1681 * All control registers and watchpoint value registers are mapped to 1682 * the lower 32 bits of their AArch64 equivalents. We share the trap 1683 * handlers with the above AArch64 code which checks what mode the 1684 * system is in. 1685 */ 1686 1687 static bool trap_xvr(struct kvm_vcpu *vcpu, 1688 struct sys_reg_params *p, 1689 const struct sys_reg_desc *rd) 1690 { 1691 u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg]; 1692 1693 if (p->is_write) { 1694 u64 val = *dbg_reg; 1695 1696 val &= 0xffffffffUL; 1697 val |= p->regval << 32; 1698 *dbg_reg = val; 1699 1700 vcpu->arch.flags |= KVM_ARM64_DEBUG_DIRTY; 1701 } else { 1702 p->regval = *dbg_reg >> 32; 1703 } 1704 1705 trace_trap_reg(__func__, rd->reg, p->is_write, *dbg_reg); 1706 1707 return true; 1708 } 1709 1710 #define DBG_BCR_BVR_WCR_WVR(n) \ 1711 /* DBGBVRn */ \ 1712 { Op1( 0), CRn( 0), CRm((n)), Op2( 4), trap_bvr, NULL, n }, \ 1713 /* DBGBCRn */ \ 1714 { Op1( 0), CRn( 0), CRm((n)), Op2( 5), trap_bcr, NULL, n }, \ 1715 /* DBGWVRn */ \ 1716 { Op1( 0), CRn( 0), CRm((n)), Op2( 6), trap_wvr, NULL, n }, \ 1717 /* DBGWCRn */ \ 1718 { Op1( 0), CRn( 0), CRm((n)), Op2( 7), trap_wcr, NULL, n } 1719 1720 #define DBGBXVR(n) \ 1721 { Op1( 0), CRn( 1), CRm((n)), Op2( 1), trap_xvr, NULL, n } 1722 1723 /* 1724 * Trapped cp14 registers. We generally ignore most of the external 1725 * debug, on the principle that they don't really make sense to a 1726 * guest. Revisit this one day, would this principle change. 1727 */ 1728 static const struct sys_reg_desc cp14_regs[] = { 1729 /* DBGIDR */ 1730 { Op1( 0), CRn( 0), CRm( 0), Op2( 0), trap_dbgidr }, 1731 /* DBGDTRRXext */ 1732 { Op1( 0), CRn( 0), CRm( 0), Op2( 2), trap_raz_wi }, 1733 1734 DBG_BCR_BVR_WCR_WVR(0), 1735 /* DBGDSCRint */ 1736 { Op1( 0), CRn( 0), CRm( 1), Op2( 0), trap_raz_wi }, 1737 DBG_BCR_BVR_WCR_WVR(1), 1738 /* DBGDCCINT */ 1739 { Op1( 0), CRn( 0), CRm( 2), Op2( 0), trap_debug32 }, 1740 /* DBGDSCRext */ 1741 { Op1( 0), CRn( 0), CRm( 2), Op2( 2), trap_debug32 }, 1742 DBG_BCR_BVR_WCR_WVR(2), 1743 /* DBGDTR[RT]Xint */ 1744 { Op1( 0), CRn( 0), CRm( 3), Op2( 0), trap_raz_wi }, 1745 /* DBGDTR[RT]Xext */ 1746 { Op1( 0), CRn( 0), CRm( 3), Op2( 2), trap_raz_wi }, 1747 DBG_BCR_BVR_WCR_WVR(3), 1748 DBG_BCR_BVR_WCR_WVR(4), 1749 DBG_BCR_BVR_WCR_WVR(5), 1750 /* DBGWFAR */ 1751 { Op1( 0), CRn( 0), CRm( 6), Op2( 0), trap_raz_wi }, 1752 /* DBGOSECCR */ 1753 { Op1( 0), CRn( 0), CRm( 6), Op2( 2), trap_raz_wi }, 1754 DBG_BCR_BVR_WCR_WVR(6), 1755 /* DBGVCR */ 1756 { Op1( 0), CRn( 0), CRm( 7), Op2( 0), trap_debug32 }, 1757 DBG_BCR_BVR_WCR_WVR(7), 1758 DBG_BCR_BVR_WCR_WVR(8), 1759 DBG_BCR_BVR_WCR_WVR(9), 1760 DBG_BCR_BVR_WCR_WVR(10), 1761 DBG_BCR_BVR_WCR_WVR(11), 1762 DBG_BCR_BVR_WCR_WVR(12), 1763 DBG_BCR_BVR_WCR_WVR(13), 1764 DBG_BCR_BVR_WCR_WVR(14), 1765 DBG_BCR_BVR_WCR_WVR(15), 1766 1767 /* DBGDRAR (32bit) */ 1768 { Op1( 0), CRn( 1), CRm( 0), Op2( 0), trap_raz_wi }, 1769 1770 DBGBXVR(0), 1771 /* DBGOSLAR */ 1772 { Op1( 0), CRn( 1), CRm( 0), Op2( 4), trap_raz_wi }, 1773 DBGBXVR(1), 1774 /* DBGOSLSR */ 1775 { Op1( 0), CRn( 1), CRm( 1), Op2( 4), trap_oslsr_el1 }, 1776 DBGBXVR(2), 1777 DBGBXVR(3), 1778 /* DBGOSDLR */ 1779 { Op1( 0), CRn( 1), CRm( 3), Op2( 4), trap_raz_wi }, 1780 DBGBXVR(4), 1781 /* DBGPRCR */ 1782 { Op1( 0), CRn( 1), CRm( 4), Op2( 4), trap_raz_wi }, 1783 DBGBXVR(5), 1784 DBGBXVR(6), 1785 DBGBXVR(7), 1786 DBGBXVR(8), 1787 DBGBXVR(9), 1788 DBGBXVR(10), 1789 DBGBXVR(11), 1790 DBGBXVR(12), 1791 DBGBXVR(13), 1792 DBGBXVR(14), 1793 DBGBXVR(15), 1794 1795 /* DBGDSAR (32bit) */ 1796 { Op1( 0), CRn( 2), CRm( 0), Op2( 0), trap_raz_wi }, 1797 1798 /* DBGDEVID2 */ 1799 { Op1( 0), CRn( 7), CRm( 0), Op2( 7), trap_raz_wi }, 1800 /* DBGDEVID1 */ 1801 { Op1( 0), CRn( 7), CRm( 1), Op2( 7), trap_raz_wi }, 1802 /* DBGDEVID */ 1803 { Op1( 0), CRn( 7), CRm( 2), Op2( 7), trap_raz_wi }, 1804 /* DBGCLAIMSET */ 1805 { Op1( 0), CRn( 7), CRm( 8), Op2( 6), trap_raz_wi }, 1806 /* DBGCLAIMCLR */ 1807 { Op1( 0), CRn( 7), CRm( 9), Op2( 6), trap_raz_wi }, 1808 /* DBGAUTHSTATUS */ 1809 { Op1( 0), CRn( 7), CRm(14), Op2( 6), trap_dbgauthstatus_el1 }, 1810 }; 1811 1812 /* Trapped cp14 64bit registers */ 1813 static const struct sys_reg_desc cp14_64_regs[] = { 1814 /* DBGDRAR (64bit) */ 1815 { Op1( 0), CRm( 1), .access = trap_raz_wi }, 1816 1817 /* DBGDSAR (64bit) */ 1818 { Op1( 0), CRm( 2), .access = trap_raz_wi }, 1819 }; 1820 1821 /* Macro to expand the PMEVCNTRn register */ 1822 #define PMU_PMEVCNTR(n) \ 1823 /* PMEVCNTRn */ \ 1824 { Op1(0), CRn(0b1110), \ 1825 CRm((0b1000 | (((n) >> 3) & 0x3))), Op2(((n) & 0x7)), \ 1826 access_pmu_evcntr } 1827 1828 /* Macro to expand the PMEVTYPERn register */ 1829 #define PMU_PMEVTYPER(n) \ 1830 /* PMEVTYPERn */ \ 1831 { Op1(0), CRn(0b1110), \ 1832 CRm((0b1100 | (((n) >> 3) & 0x3))), Op2(((n) & 0x7)), \ 1833 access_pmu_evtyper } 1834 1835 /* 1836 * Trapped cp15 registers. TTBR0/TTBR1 get a double encoding, 1837 * depending on the way they are accessed (as a 32bit or a 64bit 1838 * register). 1839 */ 1840 static const struct sys_reg_desc cp15_regs[] = { 1841 { Op1( 0), CRn( 0), CRm( 0), Op2( 1), access_ctr }, 1842 { Op1( 0), CRn( 1), CRm( 0), Op2( 0), access_vm_reg, NULL, c1_SCTLR }, 1843 { Op1( 0), CRn( 2), CRm( 0), Op2( 0), access_vm_reg, NULL, c2_TTBR0 }, 1844 { Op1( 0), CRn( 2), CRm( 0), Op2( 1), access_vm_reg, NULL, c2_TTBR1 }, 1845 { Op1( 0), CRn( 2), CRm( 0), Op2( 2), access_vm_reg, NULL, c2_TTBCR }, 1846 { Op1( 0), CRn( 3), CRm( 0), Op2( 0), access_vm_reg, NULL, c3_DACR }, 1847 { Op1( 0), CRn( 5), CRm( 0), Op2( 0), access_vm_reg, NULL, c5_DFSR }, 1848 { Op1( 0), CRn( 5), CRm( 0), Op2( 1), access_vm_reg, NULL, c5_IFSR }, 1849 { Op1( 0), CRn( 5), CRm( 1), Op2( 0), access_vm_reg, NULL, c5_ADFSR }, 1850 { Op1( 0), CRn( 5), CRm( 1), Op2( 1), access_vm_reg, NULL, c5_AIFSR }, 1851 { Op1( 0), CRn( 6), CRm( 0), Op2( 0), access_vm_reg, NULL, c6_DFAR }, 1852 { Op1( 0), CRn( 6), CRm( 0), Op2( 2), access_vm_reg, NULL, c6_IFAR }, 1853 1854 /* 1855 * DC{C,I,CI}SW operations: 1856 */ 1857 { Op1( 0), CRn( 7), CRm( 6), Op2( 2), access_dcsw }, 1858 { Op1( 0), CRn( 7), CRm(10), Op2( 2), access_dcsw }, 1859 { Op1( 0), CRn( 7), CRm(14), Op2( 2), access_dcsw }, 1860 1861 /* PMU */ 1862 { Op1( 0), CRn( 9), CRm(12), Op2( 0), access_pmcr }, 1863 { Op1( 0), CRn( 9), CRm(12), Op2( 1), access_pmcnten }, 1864 { Op1( 0), CRn( 9), CRm(12), Op2( 2), access_pmcnten }, 1865 { Op1( 0), CRn( 9), CRm(12), Op2( 3), access_pmovs }, 1866 { Op1( 0), CRn( 9), CRm(12), Op2( 4), access_pmswinc }, 1867 { Op1( 0), CRn( 9), CRm(12), Op2( 5), access_pmselr }, 1868 { Op1( 0), CRn( 9), CRm(12), Op2( 6), access_pmceid }, 1869 { Op1( 0), CRn( 9), CRm(12), Op2( 7), access_pmceid }, 1870 { Op1( 0), CRn( 9), CRm(13), Op2( 0), access_pmu_evcntr }, 1871 { Op1( 0), CRn( 9), CRm(13), Op2( 1), access_pmu_evtyper }, 1872 { Op1( 0), CRn( 9), CRm(13), Op2( 2), access_pmu_evcntr }, 1873 { Op1( 0), CRn( 9), CRm(14), Op2( 0), access_pmuserenr }, 1874 { Op1( 0), CRn( 9), CRm(14), Op2( 1), access_pminten }, 1875 { Op1( 0), CRn( 9), CRm(14), Op2( 2), access_pminten }, 1876 { Op1( 0), CRn( 9), CRm(14), Op2( 3), access_pmovs }, 1877 1878 { Op1( 0), CRn(10), CRm( 2), Op2( 0), access_vm_reg, NULL, c10_PRRR }, 1879 { Op1( 0), CRn(10), CRm( 2), Op2( 1), access_vm_reg, NULL, c10_NMRR }, 1880 { Op1( 0), CRn(10), CRm( 3), Op2( 0), access_vm_reg, NULL, c10_AMAIR0 }, 1881 { Op1( 0), CRn(10), CRm( 3), Op2( 1), access_vm_reg, NULL, c10_AMAIR1 }, 1882 1883 /* ICC_SRE */ 1884 { Op1( 0), CRn(12), CRm(12), Op2( 5), access_gic_sre }, 1885 1886 { Op1( 0), CRn(13), CRm( 0), Op2( 1), access_vm_reg, NULL, c13_CID }, 1887 1888 /* Arch Tmers */ 1889 { SYS_DESC(SYS_AARCH32_CNTP_TVAL), access_arch_timer }, 1890 { SYS_DESC(SYS_AARCH32_CNTP_CTL), access_arch_timer }, 1891 1892 /* PMEVCNTRn */ 1893 PMU_PMEVCNTR(0), 1894 PMU_PMEVCNTR(1), 1895 PMU_PMEVCNTR(2), 1896 PMU_PMEVCNTR(3), 1897 PMU_PMEVCNTR(4), 1898 PMU_PMEVCNTR(5), 1899 PMU_PMEVCNTR(6), 1900 PMU_PMEVCNTR(7), 1901 PMU_PMEVCNTR(8), 1902 PMU_PMEVCNTR(9), 1903 PMU_PMEVCNTR(10), 1904 PMU_PMEVCNTR(11), 1905 PMU_PMEVCNTR(12), 1906 PMU_PMEVCNTR(13), 1907 PMU_PMEVCNTR(14), 1908 PMU_PMEVCNTR(15), 1909 PMU_PMEVCNTR(16), 1910 PMU_PMEVCNTR(17), 1911 PMU_PMEVCNTR(18), 1912 PMU_PMEVCNTR(19), 1913 PMU_PMEVCNTR(20), 1914 PMU_PMEVCNTR(21), 1915 PMU_PMEVCNTR(22), 1916 PMU_PMEVCNTR(23), 1917 PMU_PMEVCNTR(24), 1918 PMU_PMEVCNTR(25), 1919 PMU_PMEVCNTR(26), 1920 PMU_PMEVCNTR(27), 1921 PMU_PMEVCNTR(28), 1922 PMU_PMEVCNTR(29), 1923 PMU_PMEVCNTR(30), 1924 /* PMEVTYPERn */ 1925 PMU_PMEVTYPER(0), 1926 PMU_PMEVTYPER(1), 1927 PMU_PMEVTYPER(2), 1928 PMU_PMEVTYPER(3), 1929 PMU_PMEVTYPER(4), 1930 PMU_PMEVTYPER(5), 1931 PMU_PMEVTYPER(6), 1932 PMU_PMEVTYPER(7), 1933 PMU_PMEVTYPER(8), 1934 PMU_PMEVTYPER(9), 1935 PMU_PMEVTYPER(10), 1936 PMU_PMEVTYPER(11), 1937 PMU_PMEVTYPER(12), 1938 PMU_PMEVTYPER(13), 1939 PMU_PMEVTYPER(14), 1940 PMU_PMEVTYPER(15), 1941 PMU_PMEVTYPER(16), 1942 PMU_PMEVTYPER(17), 1943 PMU_PMEVTYPER(18), 1944 PMU_PMEVTYPER(19), 1945 PMU_PMEVTYPER(20), 1946 PMU_PMEVTYPER(21), 1947 PMU_PMEVTYPER(22), 1948 PMU_PMEVTYPER(23), 1949 PMU_PMEVTYPER(24), 1950 PMU_PMEVTYPER(25), 1951 PMU_PMEVTYPER(26), 1952 PMU_PMEVTYPER(27), 1953 PMU_PMEVTYPER(28), 1954 PMU_PMEVTYPER(29), 1955 PMU_PMEVTYPER(30), 1956 /* PMCCFILTR */ 1957 { Op1(0), CRn(14), CRm(15), Op2(7), access_pmu_evtyper }, 1958 1959 { Op1(1), CRn( 0), CRm( 0), Op2(0), access_ccsidr }, 1960 { Op1(1), CRn( 0), CRm( 0), Op2(1), access_clidr }, 1961 { Op1(2), CRn( 0), CRm( 0), Op2(0), access_csselr, NULL, c0_CSSELR }, 1962 }; 1963 1964 static const struct sys_reg_desc cp15_64_regs[] = { 1965 { Op1( 0), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, c2_TTBR0 }, 1966 { Op1( 0), CRn( 0), CRm( 9), Op2( 0), access_pmu_evcntr }, 1967 { Op1( 0), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_SGI1R */ 1968 { Op1( 1), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, c2_TTBR1 }, 1969 { Op1( 1), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_ASGI1R */ 1970 { Op1( 2), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_SGI0R */ 1971 { SYS_DESC(SYS_AARCH32_CNTP_CVAL), access_arch_timer }, 1972 }; 1973 1974 /* Target specific emulation tables */ 1975 static struct kvm_sys_reg_target_table *target_tables[KVM_ARM_NUM_TARGETS]; 1976 1977 void kvm_register_target_sys_reg_table(unsigned int target, 1978 struct kvm_sys_reg_target_table *table) 1979 { 1980 target_tables[target] = table; 1981 } 1982 1983 /* Get specific register table for this target. */ 1984 static const struct sys_reg_desc *get_target_table(unsigned target, 1985 bool mode_is_64, 1986 size_t *num) 1987 { 1988 struct kvm_sys_reg_target_table *table; 1989 1990 table = target_tables[target]; 1991 if (mode_is_64) { 1992 *num = table->table64.num; 1993 return table->table64.table; 1994 } else { 1995 *num = table->table32.num; 1996 return table->table32.table; 1997 } 1998 } 1999 2000 static int match_sys_reg(const void *key, const void *elt) 2001 { 2002 const unsigned long pval = (unsigned long)key; 2003 const struct sys_reg_desc *r = elt; 2004 2005 return pval - reg_to_encoding(r); 2006 } 2007 2008 static const struct sys_reg_desc *find_reg(const struct sys_reg_params *params, 2009 const struct sys_reg_desc table[], 2010 unsigned int num) 2011 { 2012 unsigned long pval = reg_to_encoding(params); 2013 2014 return bsearch((void *)pval, table, num, sizeof(table[0]), match_sys_reg); 2015 } 2016 2017 int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu, struct kvm_run *run) 2018 { 2019 kvm_inject_undefined(vcpu); 2020 return 1; 2021 } 2022 2023 static void perform_access(struct kvm_vcpu *vcpu, 2024 struct sys_reg_params *params, 2025 const struct sys_reg_desc *r) 2026 { 2027 trace_kvm_sys_access(*vcpu_pc(vcpu), params, r); 2028 2029 /* Check for regs disabled by runtime config */ 2030 if (sysreg_hidden_from_guest(vcpu, r)) { 2031 kvm_inject_undefined(vcpu); 2032 return; 2033 } 2034 2035 /* 2036 * Not having an accessor means that we have configured a trap 2037 * that we don't know how to handle. This certainly qualifies 2038 * as a gross bug that should be fixed right away. 2039 */ 2040 BUG_ON(!r->access); 2041 2042 /* Skip instruction if instructed so */ 2043 if (likely(r->access(vcpu, params, r))) 2044 kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); 2045 } 2046 2047 /* 2048 * emulate_cp -- tries to match a sys_reg access in a handling table, and 2049 * call the corresponding trap handler. 2050 * 2051 * @params: pointer to the descriptor of the access 2052 * @table: array of trap descriptors 2053 * @num: size of the trap descriptor array 2054 * 2055 * Return 0 if the access has been handled, and -1 if not. 2056 */ 2057 static int emulate_cp(struct kvm_vcpu *vcpu, 2058 struct sys_reg_params *params, 2059 const struct sys_reg_desc *table, 2060 size_t num) 2061 { 2062 const struct sys_reg_desc *r; 2063 2064 if (!table) 2065 return -1; /* Not handled */ 2066 2067 r = find_reg(params, table, num); 2068 2069 if (r) { 2070 perform_access(vcpu, params, r); 2071 return 0; 2072 } 2073 2074 /* Not handled */ 2075 return -1; 2076 } 2077 2078 static void unhandled_cp_access(struct kvm_vcpu *vcpu, 2079 struct sys_reg_params *params) 2080 { 2081 u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu); 2082 int cp = -1; 2083 2084 switch(hsr_ec) { 2085 case ESR_ELx_EC_CP15_32: 2086 case ESR_ELx_EC_CP15_64: 2087 cp = 15; 2088 break; 2089 case ESR_ELx_EC_CP14_MR: 2090 case ESR_ELx_EC_CP14_64: 2091 cp = 14; 2092 break; 2093 default: 2094 WARN_ON(1); 2095 } 2096 2097 kvm_err("Unsupported guest CP%d access at: %08lx [%08lx]\n", 2098 cp, *vcpu_pc(vcpu), *vcpu_cpsr(vcpu)); 2099 print_sys_reg_instr(params); 2100 kvm_inject_undefined(vcpu); 2101 } 2102 2103 /** 2104 * kvm_handle_cp_64 -- handles a mrrc/mcrr trap on a guest CP14/CP15 access 2105 * @vcpu: The VCPU pointer 2106 * @run: The kvm_run struct 2107 */ 2108 static int kvm_handle_cp_64(struct kvm_vcpu *vcpu, 2109 const struct sys_reg_desc *global, 2110 size_t nr_global, 2111 const struct sys_reg_desc *target_specific, 2112 size_t nr_specific) 2113 { 2114 struct sys_reg_params params; 2115 u32 hsr = kvm_vcpu_get_hsr(vcpu); 2116 int Rt = kvm_vcpu_sys_get_rt(vcpu); 2117 int Rt2 = (hsr >> 10) & 0x1f; 2118 2119 params.is_aarch32 = true; 2120 params.is_32bit = false; 2121 params.CRm = (hsr >> 1) & 0xf; 2122 params.is_write = ((hsr & 1) == 0); 2123 2124 params.Op0 = 0; 2125 params.Op1 = (hsr >> 16) & 0xf; 2126 params.Op2 = 0; 2127 params.CRn = 0; 2128 2129 /* 2130 * Make a 64-bit value out of Rt and Rt2. As we use the same trap 2131 * backends between AArch32 and AArch64, we get away with it. 2132 */ 2133 if (params.is_write) { 2134 params.regval = vcpu_get_reg(vcpu, Rt) & 0xffffffff; 2135 params.regval |= vcpu_get_reg(vcpu, Rt2) << 32; 2136 } 2137 2138 /* 2139 * Try to emulate the coprocessor access using the target 2140 * specific table first, and using the global table afterwards. 2141 * If either of the tables contains a handler, handle the 2142 * potential register operation in the case of a read and return 2143 * with success. 2144 */ 2145 if (!emulate_cp(vcpu, ¶ms, target_specific, nr_specific) || 2146 !emulate_cp(vcpu, ¶ms, global, nr_global)) { 2147 /* Split up the value between registers for the read side */ 2148 if (!params.is_write) { 2149 vcpu_set_reg(vcpu, Rt, lower_32_bits(params.regval)); 2150 vcpu_set_reg(vcpu, Rt2, upper_32_bits(params.regval)); 2151 } 2152 2153 return 1; 2154 } 2155 2156 unhandled_cp_access(vcpu, ¶ms); 2157 return 1; 2158 } 2159 2160 /** 2161 * kvm_handle_cp_32 -- handles a mrc/mcr trap on a guest CP14/CP15 access 2162 * @vcpu: The VCPU pointer 2163 * @run: The kvm_run struct 2164 */ 2165 static int kvm_handle_cp_32(struct kvm_vcpu *vcpu, 2166 const struct sys_reg_desc *global, 2167 size_t nr_global, 2168 const struct sys_reg_desc *target_specific, 2169 size_t nr_specific) 2170 { 2171 struct sys_reg_params params; 2172 u32 hsr = kvm_vcpu_get_hsr(vcpu); 2173 int Rt = kvm_vcpu_sys_get_rt(vcpu); 2174 2175 params.is_aarch32 = true; 2176 params.is_32bit = true; 2177 params.CRm = (hsr >> 1) & 0xf; 2178 params.regval = vcpu_get_reg(vcpu, Rt); 2179 params.is_write = ((hsr & 1) == 0); 2180 params.CRn = (hsr >> 10) & 0xf; 2181 params.Op0 = 0; 2182 params.Op1 = (hsr >> 14) & 0x7; 2183 params.Op2 = (hsr >> 17) & 0x7; 2184 2185 if (!emulate_cp(vcpu, ¶ms, target_specific, nr_specific) || 2186 !emulate_cp(vcpu, ¶ms, global, nr_global)) { 2187 if (!params.is_write) 2188 vcpu_set_reg(vcpu, Rt, params.regval); 2189 return 1; 2190 } 2191 2192 unhandled_cp_access(vcpu, ¶ms); 2193 return 1; 2194 } 2195 2196 int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run) 2197 { 2198 const struct sys_reg_desc *target_specific; 2199 size_t num; 2200 2201 target_specific = get_target_table(vcpu->arch.target, false, &num); 2202 return kvm_handle_cp_64(vcpu, 2203 cp15_64_regs, ARRAY_SIZE(cp15_64_regs), 2204 target_specific, num); 2205 } 2206 2207 int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run) 2208 { 2209 const struct sys_reg_desc *target_specific; 2210 size_t num; 2211 2212 target_specific = get_target_table(vcpu->arch.target, false, &num); 2213 return kvm_handle_cp_32(vcpu, 2214 cp15_regs, ARRAY_SIZE(cp15_regs), 2215 target_specific, num); 2216 } 2217 2218 int kvm_handle_cp14_64(struct kvm_vcpu *vcpu, struct kvm_run *run) 2219 { 2220 return kvm_handle_cp_64(vcpu, 2221 cp14_64_regs, ARRAY_SIZE(cp14_64_regs), 2222 NULL, 0); 2223 } 2224 2225 int kvm_handle_cp14_32(struct kvm_vcpu *vcpu, struct kvm_run *run) 2226 { 2227 return kvm_handle_cp_32(vcpu, 2228 cp14_regs, ARRAY_SIZE(cp14_regs), 2229 NULL, 0); 2230 } 2231 2232 static int emulate_sys_reg(struct kvm_vcpu *vcpu, 2233 struct sys_reg_params *params) 2234 { 2235 size_t num; 2236 const struct sys_reg_desc *table, *r; 2237 2238 table = get_target_table(vcpu->arch.target, true, &num); 2239 2240 /* Search target-specific then generic table. */ 2241 r = find_reg(params, table, num); 2242 if (!r) 2243 r = find_reg(params, sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); 2244 2245 if (likely(r)) { 2246 perform_access(vcpu, params, r); 2247 } else { 2248 kvm_err("Unsupported guest sys_reg access at: %lx [%08lx]\n", 2249 *vcpu_pc(vcpu), *vcpu_cpsr(vcpu)); 2250 print_sys_reg_instr(params); 2251 kvm_inject_undefined(vcpu); 2252 } 2253 return 1; 2254 } 2255 2256 static void reset_sys_reg_descs(struct kvm_vcpu *vcpu, 2257 const struct sys_reg_desc *table, size_t num, 2258 unsigned long *bmap) 2259 { 2260 unsigned long i; 2261 2262 for (i = 0; i < num; i++) 2263 if (table[i].reset) { 2264 int reg = table[i].reg; 2265 2266 table[i].reset(vcpu, &table[i]); 2267 if (reg > 0 && reg < NR_SYS_REGS) 2268 set_bit(reg, bmap); 2269 } 2270 } 2271 2272 /** 2273 * kvm_handle_sys_reg -- handles a mrs/msr trap on a guest sys_reg access 2274 * @vcpu: The VCPU pointer 2275 * @run: The kvm_run struct 2276 */ 2277 int kvm_handle_sys_reg(struct kvm_vcpu *vcpu, struct kvm_run *run) 2278 { 2279 struct sys_reg_params params; 2280 unsigned long esr = kvm_vcpu_get_hsr(vcpu); 2281 int Rt = kvm_vcpu_sys_get_rt(vcpu); 2282 int ret; 2283 2284 trace_kvm_handle_sys_reg(esr); 2285 2286 params.is_aarch32 = false; 2287 params.is_32bit = false; 2288 params.Op0 = (esr >> 20) & 3; 2289 params.Op1 = (esr >> 14) & 0x7; 2290 params.CRn = (esr >> 10) & 0xf; 2291 params.CRm = (esr >> 1) & 0xf; 2292 params.Op2 = (esr >> 17) & 0x7; 2293 params.regval = vcpu_get_reg(vcpu, Rt); 2294 params.is_write = !(esr & 1); 2295 2296 ret = emulate_sys_reg(vcpu, ¶ms); 2297 2298 if (!params.is_write) 2299 vcpu_set_reg(vcpu, Rt, params.regval); 2300 return ret; 2301 } 2302 2303 /****************************************************************************** 2304 * Userspace API 2305 *****************************************************************************/ 2306 2307 static bool index_to_params(u64 id, struct sys_reg_params *params) 2308 { 2309 switch (id & KVM_REG_SIZE_MASK) { 2310 case KVM_REG_SIZE_U64: 2311 /* Any unused index bits means it's not valid. */ 2312 if (id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK 2313 | KVM_REG_ARM_COPROC_MASK 2314 | KVM_REG_ARM64_SYSREG_OP0_MASK 2315 | KVM_REG_ARM64_SYSREG_OP1_MASK 2316 | KVM_REG_ARM64_SYSREG_CRN_MASK 2317 | KVM_REG_ARM64_SYSREG_CRM_MASK 2318 | KVM_REG_ARM64_SYSREG_OP2_MASK)) 2319 return false; 2320 params->Op0 = ((id & KVM_REG_ARM64_SYSREG_OP0_MASK) 2321 >> KVM_REG_ARM64_SYSREG_OP0_SHIFT); 2322 params->Op1 = ((id & KVM_REG_ARM64_SYSREG_OP1_MASK) 2323 >> KVM_REG_ARM64_SYSREG_OP1_SHIFT); 2324 params->CRn = ((id & KVM_REG_ARM64_SYSREG_CRN_MASK) 2325 >> KVM_REG_ARM64_SYSREG_CRN_SHIFT); 2326 params->CRm = ((id & KVM_REG_ARM64_SYSREG_CRM_MASK) 2327 >> KVM_REG_ARM64_SYSREG_CRM_SHIFT); 2328 params->Op2 = ((id & KVM_REG_ARM64_SYSREG_OP2_MASK) 2329 >> KVM_REG_ARM64_SYSREG_OP2_SHIFT); 2330 return true; 2331 default: 2332 return false; 2333 } 2334 } 2335 2336 const struct sys_reg_desc *find_reg_by_id(u64 id, 2337 struct sys_reg_params *params, 2338 const struct sys_reg_desc table[], 2339 unsigned int num) 2340 { 2341 if (!index_to_params(id, params)) 2342 return NULL; 2343 2344 return find_reg(params, table, num); 2345 } 2346 2347 /* Decode an index value, and find the sys_reg_desc entry. */ 2348 static const struct sys_reg_desc *index_to_sys_reg_desc(struct kvm_vcpu *vcpu, 2349 u64 id) 2350 { 2351 size_t num; 2352 const struct sys_reg_desc *table, *r; 2353 struct sys_reg_params params; 2354 2355 /* We only do sys_reg for now. */ 2356 if ((id & KVM_REG_ARM_COPROC_MASK) != KVM_REG_ARM64_SYSREG) 2357 return NULL; 2358 2359 table = get_target_table(vcpu->arch.target, true, &num); 2360 r = find_reg_by_id(id, ¶ms, table, num); 2361 if (!r) 2362 r = find_reg(¶ms, sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); 2363 2364 /* Not saved in the sys_reg array and not otherwise accessible? */ 2365 if (r && !(r->reg || r->get_user)) 2366 r = NULL; 2367 2368 return r; 2369 } 2370 2371 /* 2372 * These are the invariant sys_reg registers: we let the guest see the 2373 * host versions of these, so they're part of the guest state. 2374 * 2375 * A future CPU may provide a mechanism to present different values to 2376 * the guest, or a future kvm may trap them. 2377 */ 2378 2379 #define FUNCTION_INVARIANT(reg) \ 2380 static void get_##reg(struct kvm_vcpu *v, \ 2381 const struct sys_reg_desc *r) \ 2382 { \ 2383 ((struct sys_reg_desc *)r)->val = read_sysreg(reg); \ 2384 } 2385 2386 FUNCTION_INVARIANT(midr_el1) 2387 FUNCTION_INVARIANT(revidr_el1) 2388 FUNCTION_INVARIANT(clidr_el1) 2389 FUNCTION_INVARIANT(aidr_el1) 2390 2391 static void get_ctr_el0(struct kvm_vcpu *v, const struct sys_reg_desc *r) 2392 { 2393 ((struct sys_reg_desc *)r)->val = read_sanitised_ftr_reg(SYS_CTR_EL0); 2394 } 2395 2396 /* ->val is filled in by kvm_sys_reg_table_init() */ 2397 static struct sys_reg_desc invariant_sys_regs[] = { 2398 { SYS_DESC(SYS_MIDR_EL1), NULL, get_midr_el1 }, 2399 { SYS_DESC(SYS_REVIDR_EL1), NULL, get_revidr_el1 }, 2400 { SYS_DESC(SYS_CLIDR_EL1), NULL, get_clidr_el1 }, 2401 { SYS_DESC(SYS_AIDR_EL1), NULL, get_aidr_el1 }, 2402 { SYS_DESC(SYS_CTR_EL0), NULL, get_ctr_el0 }, 2403 }; 2404 2405 static int reg_from_user(u64 *val, const void __user *uaddr, u64 id) 2406 { 2407 if (copy_from_user(val, uaddr, KVM_REG_SIZE(id)) != 0) 2408 return -EFAULT; 2409 return 0; 2410 } 2411 2412 static int reg_to_user(void __user *uaddr, const u64 *val, u64 id) 2413 { 2414 if (copy_to_user(uaddr, val, KVM_REG_SIZE(id)) != 0) 2415 return -EFAULT; 2416 return 0; 2417 } 2418 2419 static int get_invariant_sys_reg(u64 id, void __user *uaddr) 2420 { 2421 struct sys_reg_params params; 2422 const struct sys_reg_desc *r; 2423 2424 r = find_reg_by_id(id, ¶ms, invariant_sys_regs, 2425 ARRAY_SIZE(invariant_sys_regs)); 2426 if (!r) 2427 return -ENOENT; 2428 2429 return reg_to_user(uaddr, &r->val, id); 2430 } 2431 2432 static int set_invariant_sys_reg(u64 id, void __user *uaddr) 2433 { 2434 struct sys_reg_params params; 2435 const struct sys_reg_desc *r; 2436 int err; 2437 u64 val = 0; /* Make sure high bits are 0 for 32-bit regs */ 2438 2439 r = find_reg_by_id(id, ¶ms, invariant_sys_regs, 2440 ARRAY_SIZE(invariant_sys_regs)); 2441 if (!r) 2442 return -ENOENT; 2443 2444 err = reg_from_user(&val, uaddr, id); 2445 if (err) 2446 return err; 2447 2448 /* This is what we mean by invariant: you can't change it. */ 2449 if (r->val != val) 2450 return -EINVAL; 2451 2452 return 0; 2453 } 2454 2455 static bool is_valid_cache(u32 val) 2456 { 2457 u32 level, ctype; 2458 2459 if (val >= CSSELR_MAX) 2460 return false; 2461 2462 /* Bottom bit is Instruction or Data bit. Next 3 bits are level. */ 2463 level = (val >> 1); 2464 ctype = (cache_levels >> (level * 3)) & 7; 2465 2466 switch (ctype) { 2467 case 0: /* No cache */ 2468 return false; 2469 case 1: /* Instruction cache only */ 2470 return (val & 1); 2471 case 2: /* Data cache only */ 2472 case 4: /* Unified cache */ 2473 return !(val & 1); 2474 case 3: /* Separate instruction and data caches */ 2475 return true; 2476 default: /* Reserved: we can't know instruction or data. */ 2477 return false; 2478 } 2479 } 2480 2481 static int demux_c15_get(u64 id, void __user *uaddr) 2482 { 2483 u32 val; 2484 u32 __user *uval = uaddr; 2485 2486 /* Fail if we have unknown bits set. */ 2487 if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK 2488 | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1))) 2489 return -ENOENT; 2490 2491 switch (id & KVM_REG_ARM_DEMUX_ID_MASK) { 2492 case KVM_REG_ARM_DEMUX_ID_CCSIDR: 2493 if (KVM_REG_SIZE(id) != 4) 2494 return -ENOENT; 2495 val = (id & KVM_REG_ARM_DEMUX_VAL_MASK) 2496 >> KVM_REG_ARM_DEMUX_VAL_SHIFT; 2497 if (!is_valid_cache(val)) 2498 return -ENOENT; 2499 2500 return put_user(get_ccsidr(val), uval); 2501 default: 2502 return -ENOENT; 2503 } 2504 } 2505 2506 static int demux_c15_set(u64 id, void __user *uaddr) 2507 { 2508 u32 val, newval; 2509 u32 __user *uval = uaddr; 2510 2511 /* Fail if we have unknown bits set. */ 2512 if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK 2513 | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1))) 2514 return -ENOENT; 2515 2516 switch (id & KVM_REG_ARM_DEMUX_ID_MASK) { 2517 case KVM_REG_ARM_DEMUX_ID_CCSIDR: 2518 if (KVM_REG_SIZE(id) != 4) 2519 return -ENOENT; 2520 val = (id & KVM_REG_ARM_DEMUX_VAL_MASK) 2521 >> KVM_REG_ARM_DEMUX_VAL_SHIFT; 2522 if (!is_valid_cache(val)) 2523 return -ENOENT; 2524 2525 if (get_user(newval, uval)) 2526 return -EFAULT; 2527 2528 /* This is also invariant: you can't change it. */ 2529 if (newval != get_ccsidr(val)) 2530 return -EINVAL; 2531 return 0; 2532 default: 2533 return -ENOENT; 2534 } 2535 } 2536 2537 int kvm_arm_sys_reg_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) 2538 { 2539 const struct sys_reg_desc *r; 2540 void __user *uaddr = (void __user *)(unsigned long)reg->addr; 2541 2542 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX) 2543 return demux_c15_get(reg->id, uaddr); 2544 2545 if (KVM_REG_SIZE(reg->id) != sizeof(__u64)) 2546 return -ENOENT; 2547 2548 r = index_to_sys_reg_desc(vcpu, reg->id); 2549 if (!r) 2550 return get_invariant_sys_reg(reg->id, uaddr); 2551 2552 /* Check for regs disabled by runtime config */ 2553 if (sysreg_hidden_from_user(vcpu, r)) 2554 return -ENOENT; 2555 2556 if (r->get_user) 2557 return (r->get_user)(vcpu, r, reg, uaddr); 2558 2559 return reg_to_user(uaddr, &__vcpu_sys_reg(vcpu, r->reg), reg->id); 2560 } 2561 2562 int kvm_arm_sys_reg_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) 2563 { 2564 const struct sys_reg_desc *r; 2565 void __user *uaddr = (void __user *)(unsigned long)reg->addr; 2566 2567 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX) 2568 return demux_c15_set(reg->id, uaddr); 2569 2570 if (KVM_REG_SIZE(reg->id) != sizeof(__u64)) 2571 return -ENOENT; 2572 2573 r = index_to_sys_reg_desc(vcpu, reg->id); 2574 if (!r) 2575 return set_invariant_sys_reg(reg->id, uaddr); 2576 2577 /* Check for regs disabled by runtime config */ 2578 if (sysreg_hidden_from_user(vcpu, r)) 2579 return -ENOENT; 2580 2581 if (r->set_user) 2582 return (r->set_user)(vcpu, r, reg, uaddr); 2583 2584 return reg_from_user(&__vcpu_sys_reg(vcpu, r->reg), uaddr, reg->id); 2585 } 2586 2587 static unsigned int num_demux_regs(void) 2588 { 2589 unsigned int i, count = 0; 2590 2591 for (i = 0; i < CSSELR_MAX; i++) 2592 if (is_valid_cache(i)) 2593 count++; 2594 2595 return count; 2596 } 2597 2598 static int write_demux_regids(u64 __user *uindices) 2599 { 2600 u64 val = KVM_REG_ARM64 | KVM_REG_SIZE_U32 | KVM_REG_ARM_DEMUX; 2601 unsigned int i; 2602 2603 val |= KVM_REG_ARM_DEMUX_ID_CCSIDR; 2604 for (i = 0; i < CSSELR_MAX; i++) { 2605 if (!is_valid_cache(i)) 2606 continue; 2607 if (put_user(val | i, uindices)) 2608 return -EFAULT; 2609 uindices++; 2610 } 2611 return 0; 2612 } 2613 2614 static u64 sys_reg_to_index(const struct sys_reg_desc *reg) 2615 { 2616 return (KVM_REG_ARM64 | KVM_REG_SIZE_U64 | 2617 KVM_REG_ARM64_SYSREG | 2618 (reg->Op0 << KVM_REG_ARM64_SYSREG_OP0_SHIFT) | 2619 (reg->Op1 << KVM_REG_ARM64_SYSREG_OP1_SHIFT) | 2620 (reg->CRn << KVM_REG_ARM64_SYSREG_CRN_SHIFT) | 2621 (reg->CRm << KVM_REG_ARM64_SYSREG_CRM_SHIFT) | 2622 (reg->Op2 << KVM_REG_ARM64_SYSREG_OP2_SHIFT)); 2623 } 2624 2625 static bool copy_reg_to_user(const struct sys_reg_desc *reg, u64 __user **uind) 2626 { 2627 if (!*uind) 2628 return true; 2629 2630 if (put_user(sys_reg_to_index(reg), *uind)) 2631 return false; 2632 2633 (*uind)++; 2634 return true; 2635 } 2636 2637 static int walk_one_sys_reg(const struct kvm_vcpu *vcpu, 2638 const struct sys_reg_desc *rd, 2639 u64 __user **uind, 2640 unsigned int *total) 2641 { 2642 /* 2643 * Ignore registers we trap but don't save, 2644 * and for which no custom user accessor is provided. 2645 */ 2646 if (!(rd->reg || rd->get_user)) 2647 return 0; 2648 2649 if (sysreg_hidden_from_user(vcpu, rd)) 2650 return 0; 2651 2652 if (!copy_reg_to_user(rd, uind)) 2653 return -EFAULT; 2654 2655 (*total)++; 2656 return 0; 2657 } 2658 2659 /* Assumed ordered tables, see kvm_sys_reg_table_init. */ 2660 static int walk_sys_regs(struct kvm_vcpu *vcpu, u64 __user *uind) 2661 { 2662 const struct sys_reg_desc *i1, *i2, *end1, *end2; 2663 unsigned int total = 0; 2664 size_t num; 2665 int err; 2666 2667 /* We check for duplicates here, to allow arch-specific overrides. */ 2668 i1 = get_target_table(vcpu->arch.target, true, &num); 2669 end1 = i1 + num; 2670 i2 = sys_reg_descs; 2671 end2 = sys_reg_descs + ARRAY_SIZE(sys_reg_descs); 2672 2673 BUG_ON(i1 == end1 || i2 == end2); 2674 2675 /* Walk carefully, as both tables may refer to the same register. */ 2676 while (i1 || i2) { 2677 int cmp = cmp_sys_reg(i1, i2); 2678 /* target-specific overrides generic entry. */ 2679 if (cmp <= 0) 2680 err = walk_one_sys_reg(vcpu, i1, &uind, &total); 2681 else 2682 err = walk_one_sys_reg(vcpu, i2, &uind, &total); 2683 2684 if (err) 2685 return err; 2686 2687 if (cmp <= 0 && ++i1 == end1) 2688 i1 = NULL; 2689 if (cmp >= 0 && ++i2 == end2) 2690 i2 = NULL; 2691 } 2692 return total; 2693 } 2694 2695 unsigned long kvm_arm_num_sys_reg_descs(struct kvm_vcpu *vcpu) 2696 { 2697 return ARRAY_SIZE(invariant_sys_regs) 2698 + num_demux_regs() 2699 + walk_sys_regs(vcpu, (u64 __user *)NULL); 2700 } 2701 2702 int kvm_arm_copy_sys_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices) 2703 { 2704 unsigned int i; 2705 int err; 2706 2707 /* Then give them all the invariant registers' indices. */ 2708 for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++) { 2709 if (put_user(sys_reg_to_index(&invariant_sys_regs[i]), uindices)) 2710 return -EFAULT; 2711 uindices++; 2712 } 2713 2714 err = walk_sys_regs(vcpu, uindices); 2715 if (err < 0) 2716 return err; 2717 uindices += err; 2718 2719 return write_demux_regids(uindices); 2720 } 2721 2722 static int check_sysreg_table(const struct sys_reg_desc *table, unsigned int n) 2723 { 2724 unsigned int i; 2725 2726 for (i = 1; i < n; i++) { 2727 if (cmp_sys_reg(&table[i-1], &table[i]) >= 0) { 2728 kvm_err("sys_reg table %p out of order (%d)\n", table, i - 1); 2729 return 1; 2730 } 2731 } 2732 2733 return 0; 2734 } 2735 2736 void kvm_sys_reg_table_init(void) 2737 { 2738 unsigned int i; 2739 struct sys_reg_desc clidr; 2740 2741 /* Make sure tables are unique and in order. */ 2742 BUG_ON(check_sysreg_table(sys_reg_descs, ARRAY_SIZE(sys_reg_descs))); 2743 BUG_ON(check_sysreg_table(cp14_regs, ARRAY_SIZE(cp14_regs))); 2744 BUG_ON(check_sysreg_table(cp14_64_regs, ARRAY_SIZE(cp14_64_regs))); 2745 BUG_ON(check_sysreg_table(cp15_regs, ARRAY_SIZE(cp15_regs))); 2746 BUG_ON(check_sysreg_table(cp15_64_regs, ARRAY_SIZE(cp15_64_regs))); 2747 BUG_ON(check_sysreg_table(invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs))); 2748 2749 /* We abuse the reset function to overwrite the table itself. */ 2750 for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++) 2751 invariant_sys_regs[i].reset(NULL, &invariant_sys_regs[i]); 2752 2753 /* 2754 * CLIDR format is awkward, so clean it up. See ARM B4.1.20: 2755 * 2756 * If software reads the Cache Type fields from Ctype1 2757 * upwards, once it has seen a value of 0b000, no caches 2758 * exist at further-out levels of the hierarchy. So, for 2759 * example, if Ctype3 is the first Cache Type field with a 2760 * value of 0b000, the values of Ctype4 to Ctype7 must be 2761 * ignored. 2762 */ 2763 get_clidr_el1(NULL, &clidr); /* Ugly... */ 2764 cache_levels = clidr.val; 2765 for (i = 0; i < 7; i++) 2766 if (((cache_levels >> (i*3)) & 7) == 0) 2767 break; 2768 /* Clear all higher bits. */ 2769 cache_levels &= (1 << (i*3))-1; 2770 } 2771 2772 /** 2773 * kvm_reset_sys_regs - sets system registers to reset value 2774 * @vcpu: The VCPU pointer 2775 * 2776 * This function finds the right table above and sets the registers on the 2777 * virtual CPU struct to their architecturally defined reset values. 2778 */ 2779 void kvm_reset_sys_regs(struct kvm_vcpu *vcpu) 2780 { 2781 size_t num; 2782 const struct sys_reg_desc *table; 2783 DECLARE_BITMAP(bmap, NR_SYS_REGS) = { 0, }; 2784 2785 /* Generic chip reset first (so target could override). */ 2786 reset_sys_reg_descs(vcpu, sys_reg_descs, ARRAY_SIZE(sys_reg_descs), bmap); 2787 2788 table = get_target_table(vcpu->arch.target, true, &num); 2789 reset_sys_reg_descs(vcpu, table, num, bmap); 2790 2791 for (num = 1; num < NR_SYS_REGS; num++) { 2792 if (WARN(!test_bit(num, bmap), 2793 "Didn't reset __vcpu_sys_reg(%zi)\n", num)) 2794 break; 2795 } 2796 } 2797