1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2020-2023 Loongson Technology Corporation Limited 4 */ 5 6 #include <linux/err.h> 7 #include <linux/errno.h> 8 #include <linux/kvm_host.h> 9 #include <linux/module.h> 10 #include <linux/preempt.h> 11 #include <linux/vmalloc.h> 12 #include <trace/events/kvm.h> 13 #include <asm/fpu.h> 14 #include <asm/inst.h> 15 #include <asm/loongarch.h> 16 #include <asm/mmzone.h> 17 #include <asm/numa.h> 18 #include <asm/time.h> 19 #include <asm/tlb.h> 20 #include <asm/kvm_csr.h> 21 #include <asm/kvm_vcpu.h> 22 #include "trace.h" 23 24 static int kvm_emu_cpucfg(struct kvm_vcpu *vcpu, larch_inst inst) 25 { 26 int rd, rj; 27 unsigned int index, ret; 28 29 if (inst.reg2_format.opcode != cpucfg_op) 30 return EMULATE_FAIL; 31 32 rd = inst.reg2_format.rd; 33 rj = inst.reg2_format.rj; 34 ++vcpu->stat.cpucfg_exits; 35 index = vcpu->arch.gprs[rj]; 36 37 /* 38 * By LoongArch Reference Manual 2.2.10.5 39 * Return value is 0 for undefined CPUCFG index 40 * 41 * Disable preemption since hw gcsr is accessed 42 */ 43 preempt_disable(); 44 switch (index) { 45 case 0 ... (KVM_MAX_CPUCFG_REGS - 1): 46 vcpu->arch.gprs[rd] = vcpu->arch.cpucfg[index]; 47 break; 48 case CPUCFG_KVM_SIG: 49 /* CPUCFG emulation between 0x40000000 -- 0x400000ff */ 50 vcpu->arch.gprs[rd] = *(unsigned int *)KVM_SIGNATURE; 51 break; 52 case CPUCFG_KVM_FEATURE: 53 ret = vcpu->kvm->arch.pv_features & LOONGARCH_PV_FEAT_MASK; 54 vcpu->arch.gprs[rd] = ret; 55 break; 56 default: 57 vcpu->arch.gprs[rd] = 0; 58 break; 59 } 60 preempt_enable(); 61 62 return EMULATE_DONE; 63 } 64 65 static unsigned long kvm_emu_read_csr(struct kvm_vcpu *vcpu, int csrid) 66 { 67 unsigned long val = 0; 68 struct loongarch_csrs *csr = vcpu->arch.csr; 69 70 /* 71 * From LoongArch Reference Manual Volume 1 Chapter 4.2.1 72 * For undefined CSR id, return value is 0 73 */ 74 if (get_gcsr_flag(csrid) & SW_GCSR) 75 val = kvm_read_sw_gcsr(csr, csrid); 76 else 77 pr_warn_once("Unsupported csrrd 0x%x with pc %lx\n", csrid, vcpu->arch.pc); 78 79 return val; 80 } 81 82 static unsigned long kvm_emu_write_csr(struct kvm_vcpu *vcpu, int csrid, unsigned long val) 83 { 84 unsigned long old = 0; 85 struct loongarch_csrs *csr = vcpu->arch.csr; 86 87 if (get_gcsr_flag(csrid) & SW_GCSR) { 88 old = kvm_read_sw_gcsr(csr, csrid); 89 kvm_write_sw_gcsr(csr, csrid, val); 90 } else 91 pr_warn_once("Unsupported csrwr 0x%x with pc %lx\n", csrid, vcpu->arch.pc); 92 93 return old; 94 } 95 96 static unsigned long kvm_emu_xchg_csr(struct kvm_vcpu *vcpu, int csrid, 97 unsigned long csr_mask, unsigned long val) 98 { 99 unsigned long old = 0; 100 struct loongarch_csrs *csr = vcpu->arch.csr; 101 102 if (get_gcsr_flag(csrid) & SW_GCSR) { 103 old = kvm_read_sw_gcsr(csr, csrid); 104 val = (old & ~csr_mask) | (val & csr_mask); 105 kvm_write_sw_gcsr(csr, csrid, val); 106 old = old & csr_mask; 107 } else 108 pr_warn_once("Unsupported csrxchg 0x%x with pc %lx\n", csrid, vcpu->arch.pc); 109 110 return old; 111 } 112 113 static int kvm_handle_csr(struct kvm_vcpu *vcpu, larch_inst inst) 114 { 115 unsigned int rd, rj, csrid; 116 unsigned long csr_mask, val = 0; 117 118 /* 119 * CSR value mask imm 120 * rj = 0 means csrrd 121 * rj = 1 means csrwr 122 * rj != 0,1 means csrxchg 123 */ 124 rd = inst.reg2csr_format.rd; 125 rj = inst.reg2csr_format.rj; 126 csrid = inst.reg2csr_format.csr; 127 128 if (csrid >= LOONGARCH_CSR_PERFCTRL0 && csrid <= vcpu->arch.max_pmu_csrid) { 129 if (kvm_guest_has_pmu(&vcpu->arch)) { 130 vcpu->arch.pc -= 4; 131 kvm_make_request(KVM_REQ_PMU, vcpu); 132 return EMULATE_DONE; 133 } 134 } 135 136 /* Process CSR ops */ 137 switch (rj) { 138 case 0: /* process csrrd */ 139 val = kvm_emu_read_csr(vcpu, csrid); 140 vcpu->arch.gprs[rd] = val; 141 break; 142 case 1: /* process csrwr */ 143 val = vcpu->arch.gprs[rd]; 144 val = kvm_emu_write_csr(vcpu, csrid, val); 145 vcpu->arch.gprs[rd] = val; 146 break; 147 default: /* process csrxchg */ 148 val = vcpu->arch.gprs[rd]; 149 csr_mask = vcpu->arch.gprs[rj]; 150 val = kvm_emu_xchg_csr(vcpu, csrid, csr_mask, val); 151 vcpu->arch.gprs[rd] = val; 152 } 153 154 return EMULATE_DONE; 155 } 156 157 int kvm_emu_iocsr(larch_inst inst, struct kvm_run *run, struct kvm_vcpu *vcpu) 158 { 159 int idx, ret; 160 unsigned long *val; 161 u32 addr, rd, rj, opcode; 162 163 /* 164 * Each IOCSR with different opcode 165 */ 166 rd = inst.reg2_format.rd; 167 rj = inst.reg2_format.rj; 168 opcode = inst.reg2_format.opcode; 169 addr = vcpu->arch.gprs[rj]; 170 run->iocsr_io.phys_addr = addr; 171 run->iocsr_io.is_write = 0; 172 val = &vcpu->arch.gprs[rd]; 173 174 /* LoongArch is Little endian */ 175 switch (opcode) { 176 case iocsrrdb_op: 177 run->iocsr_io.len = 1; 178 break; 179 case iocsrrdh_op: 180 run->iocsr_io.len = 2; 181 break; 182 case iocsrrdw_op: 183 run->iocsr_io.len = 4; 184 break; 185 case iocsrrdd_op: 186 run->iocsr_io.len = 8; 187 break; 188 case iocsrwrb_op: 189 run->iocsr_io.len = 1; 190 run->iocsr_io.is_write = 1; 191 break; 192 case iocsrwrh_op: 193 run->iocsr_io.len = 2; 194 run->iocsr_io.is_write = 1; 195 break; 196 case iocsrwrw_op: 197 run->iocsr_io.len = 4; 198 run->iocsr_io.is_write = 1; 199 break; 200 case iocsrwrd_op: 201 run->iocsr_io.len = 8; 202 run->iocsr_io.is_write = 1; 203 break; 204 default: 205 return EMULATE_FAIL; 206 } 207 208 if (run->iocsr_io.is_write) { 209 idx = srcu_read_lock(&vcpu->kvm->srcu); 210 ret = kvm_io_bus_write(vcpu, KVM_IOCSR_BUS, addr, run->iocsr_io.len, val); 211 srcu_read_unlock(&vcpu->kvm->srcu, idx); 212 if (ret == 0) 213 ret = EMULATE_DONE; 214 else { 215 ret = EMULATE_DO_IOCSR; 216 /* Save data and let user space to write it */ 217 memcpy(run->iocsr_io.data, val, run->iocsr_io.len); 218 } 219 trace_kvm_iocsr(KVM_TRACE_IOCSR_WRITE, run->iocsr_io.len, addr, val); 220 } else { 221 idx = srcu_read_lock(&vcpu->kvm->srcu); 222 ret = kvm_io_bus_read(vcpu, KVM_IOCSR_BUS, addr, run->iocsr_io.len, val); 223 srcu_read_unlock(&vcpu->kvm->srcu, idx); 224 if (ret == 0) 225 ret = EMULATE_DONE; 226 else { 227 ret = EMULATE_DO_IOCSR; 228 /* Save register id for iocsr read completion */ 229 vcpu->arch.io_gpr = rd; 230 } 231 trace_kvm_iocsr(KVM_TRACE_IOCSR_READ, run->iocsr_io.len, addr, NULL); 232 } 233 234 return ret; 235 } 236 237 int kvm_complete_iocsr_read(struct kvm_vcpu *vcpu, struct kvm_run *run) 238 { 239 enum emulation_result er = EMULATE_DONE; 240 unsigned long *gpr = &vcpu->arch.gprs[vcpu->arch.io_gpr]; 241 242 switch (run->iocsr_io.len) { 243 case 1: 244 *gpr = *(s8 *)run->iocsr_io.data; 245 break; 246 case 2: 247 *gpr = *(s16 *)run->iocsr_io.data; 248 break; 249 case 4: 250 *gpr = *(s32 *)run->iocsr_io.data; 251 break; 252 case 8: 253 *gpr = *(s64 *)run->iocsr_io.data; 254 break; 255 default: 256 kvm_err("Bad IOCSR length: %d, addr is 0x%lx\n", 257 run->iocsr_io.len, vcpu->arch.badv); 258 er = EMULATE_FAIL; 259 break; 260 } 261 262 return er; 263 } 264 265 int kvm_emu_idle(struct kvm_vcpu *vcpu) 266 { 267 ++vcpu->stat.idle_exits; 268 trace_kvm_exit_idle(vcpu, KVM_TRACE_EXIT_IDLE); 269 270 if (!kvm_arch_vcpu_runnable(vcpu)) 271 kvm_vcpu_halt(vcpu); 272 273 return EMULATE_DONE; 274 } 275 276 static int kvm_trap_handle_gspr(struct kvm_vcpu *vcpu) 277 { 278 unsigned long curr_pc; 279 larch_inst inst; 280 enum emulation_result er = EMULATE_DONE; 281 struct kvm_run *run = vcpu->run; 282 283 /* Fetch the instruction */ 284 inst.word = vcpu->arch.badi; 285 curr_pc = vcpu->arch.pc; 286 update_pc(&vcpu->arch); 287 288 trace_kvm_exit_gspr(vcpu, inst.word); 289 er = EMULATE_FAIL; 290 switch (((inst.word >> 24) & 0xff)) { 291 case 0x0: /* CPUCFG GSPR */ 292 trace_kvm_exit_cpucfg(vcpu, KVM_TRACE_EXIT_CPUCFG); 293 er = kvm_emu_cpucfg(vcpu, inst); 294 break; 295 case 0x4: /* CSR{RD,WR,XCHG} GSPR */ 296 trace_kvm_exit_csr(vcpu, KVM_TRACE_EXIT_CSR); 297 er = kvm_handle_csr(vcpu, inst); 298 break; 299 case 0x6: /* Cache, Idle and IOCSR GSPR */ 300 switch (((inst.word >> 22) & 0x3ff)) { 301 case 0x18: /* Cache GSPR */ 302 er = EMULATE_DONE; 303 trace_kvm_exit_cache(vcpu, KVM_TRACE_EXIT_CACHE); 304 break; 305 case 0x19: /* Idle/IOCSR GSPR */ 306 switch (((inst.word >> 15) & 0x1ffff)) { 307 case 0xc90: /* IOCSR GSPR */ 308 er = kvm_emu_iocsr(inst, run, vcpu); 309 break; 310 case 0xc91: /* Idle GSPR */ 311 er = kvm_emu_idle(vcpu); 312 break; 313 default: 314 er = EMULATE_FAIL; 315 break; 316 } 317 break; 318 default: 319 er = EMULATE_FAIL; 320 break; 321 } 322 break; 323 default: 324 er = EMULATE_FAIL; 325 break; 326 } 327 328 /* Rollback PC only if emulation was unsuccessful */ 329 if (er == EMULATE_FAIL) { 330 kvm_err("[%#lx]%s: unsupported gspr instruction 0x%08x\n", 331 curr_pc, __func__, inst.word); 332 333 kvm_arch_vcpu_dump_regs(vcpu); 334 vcpu->arch.pc = curr_pc; 335 } 336 337 return er; 338 } 339 340 /* 341 * Trigger GSPR: 342 * 1) Execute CPUCFG instruction; 343 * 2) Execute CACOP/IDLE instructions; 344 * 3) Access to unimplemented CSRs/IOCSRs. 345 */ 346 static int kvm_handle_gspr(struct kvm_vcpu *vcpu, int ecode) 347 { 348 int ret = RESUME_GUEST; 349 enum emulation_result er = EMULATE_DONE; 350 351 er = kvm_trap_handle_gspr(vcpu); 352 353 if (er == EMULATE_DONE) { 354 ret = RESUME_GUEST; 355 } else if (er == EMULATE_DO_MMIO) { 356 vcpu->run->exit_reason = KVM_EXIT_MMIO; 357 ret = RESUME_HOST; 358 } else if (er == EMULATE_DO_IOCSR) { 359 vcpu->run->exit_reason = KVM_EXIT_LOONGARCH_IOCSR; 360 ret = RESUME_HOST; 361 } else { 362 kvm_queue_exception(vcpu, EXCCODE_INE, 0); 363 ret = RESUME_GUEST; 364 } 365 366 return ret; 367 } 368 369 int kvm_emu_mmio_read(struct kvm_vcpu *vcpu, larch_inst inst) 370 { 371 int idx, ret; 372 unsigned int op8, opcode, rd; 373 struct kvm_run *run = vcpu->run; 374 375 run->mmio.phys_addr = vcpu->arch.badv; 376 vcpu->mmio_needed = 2; /* signed */ 377 op8 = (inst.word >> 24) & 0xff; 378 ret = EMULATE_DO_MMIO; 379 380 switch (op8) { 381 case 0x24 ... 0x27: /* ldptr.w/d process */ 382 rd = inst.reg2i14_format.rd; 383 opcode = inst.reg2i14_format.opcode; 384 385 switch (opcode) { 386 case ldptrw_op: 387 run->mmio.len = 4; 388 break; 389 case ldptrd_op: 390 run->mmio.len = 8; 391 break; 392 default: 393 break; 394 } 395 break; 396 case 0x28 ... 0x2e: /* ld.b/h/w/d, ld.bu/hu/wu process */ 397 rd = inst.reg2i12_format.rd; 398 opcode = inst.reg2i12_format.opcode; 399 400 switch (opcode) { 401 case ldb_op: 402 run->mmio.len = 1; 403 break; 404 case ldbu_op: 405 vcpu->mmio_needed = 1; /* unsigned */ 406 run->mmio.len = 1; 407 break; 408 case ldh_op: 409 run->mmio.len = 2; 410 break; 411 case ldhu_op: 412 vcpu->mmio_needed = 1; /* unsigned */ 413 run->mmio.len = 2; 414 break; 415 case ldw_op: 416 run->mmio.len = 4; 417 break; 418 case ldwu_op: 419 vcpu->mmio_needed = 1; /* unsigned */ 420 run->mmio.len = 4; 421 break; 422 case ldd_op: 423 run->mmio.len = 8; 424 break; 425 default: 426 ret = EMULATE_FAIL; 427 break; 428 } 429 break; 430 case 0x38: /* ldx.b/h/w/d, ldx.bu/hu/wu process */ 431 rd = inst.reg3_format.rd; 432 opcode = inst.reg3_format.opcode; 433 434 switch (opcode) { 435 case ldxb_op: 436 run->mmio.len = 1; 437 break; 438 case ldxbu_op: 439 run->mmio.len = 1; 440 vcpu->mmio_needed = 1; /* unsigned */ 441 break; 442 case ldxh_op: 443 run->mmio.len = 2; 444 break; 445 case ldxhu_op: 446 run->mmio.len = 2; 447 vcpu->mmio_needed = 1; /* unsigned */ 448 break; 449 case ldxw_op: 450 run->mmio.len = 4; 451 break; 452 case ldxwu_op: 453 run->mmio.len = 4; 454 vcpu->mmio_needed = 1; /* unsigned */ 455 break; 456 case ldxd_op: 457 run->mmio.len = 8; 458 break; 459 default: 460 ret = EMULATE_FAIL; 461 break; 462 } 463 break; 464 default: 465 ret = EMULATE_FAIL; 466 } 467 468 if (ret == EMULATE_DO_MMIO) { 469 trace_kvm_mmio(KVM_TRACE_MMIO_READ, run->mmio.len, run->mmio.phys_addr, NULL); 470 471 /* 472 * If mmio device such as PCH-PIC is emulated in KVM, 473 * it need not return to user space to handle the mmio 474 * exception. 475 */ 476 idx = srcu_read_lock(&vcpu->kvm->srcu); 477 ret = kvm_io_bus_read(vcpu, KVM_MMIO_BUS, vcpu->arch.badv, 478 run->mmio.len, &vcpu->arch.gprs[rd]); 479 srcu_read_unlock(&vcpu->kvm->srcu, idx); 480 if (!ret) { 481 update_pc(&vcpu->arch); 482 vcpu->mmio_needed = 0; 483 return EMULATE_DONE; 484 } 485 486 /* Set for kvm_complete_mmio_read() use */ 487 vcpu->arch.io_gpr = rd; 488 run->mmio.is_write = 0; 489 vcpu->mmio_is_write = 0; 490 return EMULATE_DO_MMIO; 491 } 492 493 kvm_err("Read not supported Inst=0x%08x @%lx BadVaddr:%#lx\n", 494 inst.word, vcpu->arch.pc, vcpu->arch.badv); 495 kvm_arch_vcpu_dump_regs(vcpu); 496 vcpu->mmio_needed = 0; 497 498 return ret; 499 } 500 501 int kvm_complete_mmio_read(struct kvm_vcpu *vcpu, struct kvm_run *run) 502 { 503 enum emulation_result er = EMULATE_DONE; 504 unsigned long *gpr = &vcpu->arch.gprs[vcpu->arch.io_gpr]; 505 506 /* Update with new PC */ 507 update_pc(&vcpu->arch); 508 switch (run->mmio.len) { 509 case 1: 510 if (vcpu->mmio_needed == 2) 511 *gpr = *(s8 *)run->mmio.data; 512 else 513 *gpr = *(u8 *)run->mmio.data; 514 break; 515 case 2: 516 if (vcpu->mmio_needed == 2) 517 *gpr = *(s16 *)run->mmio.data; 518 else 519 *gpr = *(u16 *)run->mmio.data; 520 break; 521 case 4: 522 if (vcpu->mmio_needed == 2) 523 *gpr = *(s32 *)run->mmio.data; 524 else 525 *gpr = *(u32 *)run->mmio.data; 526 break; 527 case 8: 528 *gpr = *(s64 *)run->mmio.data; 529 break; 530 default: 531 kvm_err("Bad MMIO length: %d, addr is 0x%lx\n", 532 run->mmio.len, vcpu->arch.badv); 533 er = EMULATE_FAIL; 534 break; 535 } 536 537 trace_kvm_mmio(KVM_TRACE_MMIO_READ, run->mmio.len, 538 run->mmio.phys_addr, run->mmio.data); 539 540 return er; 541 } 542 543 int kvm_emu_mmio_write(struct kvm_vcpu *vcpu, larch_inst inst) 544 { 545 int idx, ret; 546 unsigned int rd, op8, opcode; 547 unsigned long curr_pc, rd_val = 0; 548 struct kvm_run *run = vcpu->run; 549 void *data = run->mmio.data; 550 551 /* 552 * Update PC and hold onto current PC in case there is 553 * an error and we want to rollback the PC 554 */ 555 curr_pc = vcpu->arch.pc; 556 update_pc(&vcpu->arch); 557 558 op8 = (inst.word >> 24) & 0xff; 559 run->mmio.phys_addr = vcpu->arch.badv; 560 ret = EMULATE_DO_MMIO; 561 switch (op8) { 562 case 0x24 ... 0x27: /* stptr.w/d process */ 563 rd = inst.reg2i14_format.rd; 564 opcode = inst.reg2i14_format.opcode; 565 566 switch (opcode) { 567 case stptrw_op: 568 run->mmio.len = 4; 569 *(unsigned int *)data = vcpu->arch.gprs[rd]; 570 break; 571 case stptrd_op: 572 run->mmio.len = 8; 573 *(unsigned long *)data = vcpu->arch.gprs[rd]; 574 break; 575 default: 576 ret = EMULATE_FAIL; 577 break; 578 } 579 break; 580 case 0x28 ... 0x2e: /* st.b/h/w/d process */ 581 rd = inst.reg2i12_format.rd; 582 opcode = inst.reg2i12_format.opcode; 583 rd_val = vcpu->arch.gprs[rd]; 584 585 switch (opcode) { 586 case stb_op: 587 run->mmio.len = 1; 588 *(unsigned char *)data = rd_val; 589 break; 590 case sth_op: 591 run->mmio.len = 2; 592 *(unsigned short *)data = rd_val; 593 break; 594 case stw_op: 595 run->mmio.len = 4; 596 *(unsigned int *)data = rd_val; 597 break; 598 case std_op: 599 run->mmio.len = 8; 600 *(unsigned long *)data = rd_val; 601 break; 602 default: 603 ret = EMULATE_FAIL; 604 break; 605 } 606 break; 607 case 0x38: /* stx.b/h/w/d process */ 608 rd = inst.reg3_format.rd; 609 opcode = inst.reg3_format.opcode; 610 611 switch (opcode) { 612 case stxb_op: 613 run->mmio.len = 1; 614 *(unsigned char *)data = vcpu->arch.gprs[rd]; 615 break; 616 case stxh_op: 617 run->mmio.len = 2; 618 *(unsigned short *)data = vcpu->arch.gprs[rd]; 619 break; 620 case stxw_op: 621 run->mmio.len = 4; 622 *(unsigned int *)data = vcpu->arch.gprs[rd]; 623 break; 624 case stxd_op: 625 run->mmio.len = 8; 626 *(unsigned long *)data = vcpu->arch.gprs[rd]; 627 break; 628 default: 629 ret = EMULATE_FAIL; 630 break; 631 } 632 break; 633 default: 634 ret = EMULATE_FAIL; 635 } 636 637 if (ret == EMULATE_DO_MMIO) { 638 trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, run->mmio.len, run->mmio.phys_addr, data); 639 640 /* 641 * If mmio device such as PCH-PIC is emulated in KVM, 642 * it need not return to user space to handle the mmio 643 * exception. 644 */ 645 idx = srcu_read_lock(&vcpu->kvm->srcu); 646 ret = kvm_io_bus_write(vcpu, KVM_MMIO_BUS, vcpu->arch.badv, run->mmio.len, data); 647 srcu_read_unlock(&vcpu->kvm->srcu, idx); 648 if (!ret) 649 return EMULATE_DONE; 650 651 run->mmio.is_write = 1; 652 vcpu->mmio_needed = 1; 653 vcpu->mmio_is_write = 1; 654 return EMULATE_DO_MMIO; 655 } 656 657 vcpu->arch.pc = curr_pc; 658 kvm_err("Write not supported Inst=0x%08x @%lx BadVaddr:%#lx\n", 659 inst.word, vcpu->arch.pc, vcpu->arch.badv); 660 kvm_arch_vcpu_dump_regs(vcpu); 661 /* Rollback PC if emulation was unsuccessful */ 662 663 return ret; 664 } 665 666 static int kvm_handle_rdwr_fault(struct kvm_vcpu *vcpu, bool write, int ecode) 667 { 668 int ret; 669 larch_inst inst; 670 enum emulation_result er = EMULATE_DONE; 671 struct kvm_run *run = vcpu->run; 672 unsigned long badv = vcpu->arch.badv; 673 674 /* Inject ADE exception if exceed max GPA size */ 675 if (unlikely(badv >= vcpu->kvm->arch.gpa_size)) { 676 kvm_queue_exception(vcpu, EXCCODE_ADE, EXSUBCODE_ADEM); 677 return RESUME_GUEST; 678 } 679 680 ret = kvm_handle_mm_fault(vcpu, badv, write, ecode); 681 if (ret) { 682 /* Treat as MMIO */ 683 inst.word = vcpu->arch.badi; 684 if (write) { 685 er = kvm_emu_mmio_write(vcpu, inst); 686 } else { 687 /* A code fetch fault doesn't count as an MMIO */ 688 if (kvm_is_ifetch_fault(&vcpu->arch)) { 689 kvm_queue_exception(vcpu, EXCCODE_ADE, EXSUBCODE_ADEF); 690 return RESUME_GUEST; 691 } 692 693 er = kvm_emu_mmio_read(vcpu, inst); 694 } 695 } 696 697 if (er == EMULATE_DONE) { 698 ret = RESUME_GUEST; 699 } else if (er == EMULATE_DO_MMIO) { 700 run->exit_reason = KVM_EXIT_MMIO; 701 ret = RESUME_HOST; 702 } else { 703 kvm_queue_exception(vcpu, EXCCODE_ADE, EXSUBCODE_ADEM); 704 ret = RESUME_GUEST; 705 } 706 707 return ret; 708 } 709 710 static int kvm_handle_read_fault(struct kvm_vcpu *vcpu, int ecode) 711 { 712 return kvm_handle_rdwr_fault(vcpu, false, ecode); 713 } 714 715 static int kvm_handle_write_fault(struct kvm_vcpu *vcpu, int ecode) 716 { 717 return kvm_handle_rdwr_fault(vcpu, true, ecode); 718 } 719 720 int kvm_complete_user_service(struct kvm_vcpu *vcpu, struct kvm_run *run) 721 { 722 update_pc(&vcpu->arch); 723 kvm_write_reg(vcpu, LOONGARCH_GPR_A0, run->hypercall.ret); 724 725 return 0; 726 } 727 728 /** 729 * kvm_handle_fpu_disabled() - Guest used fpu however it is disabled at host 730 * @vcpu: Virtual CPU context. 731 * @ecode: Exception code. 732 * 733 * Handle when the guest attempts to use fpu which hasn't been allowed 734 * by the root context. 735 */ 736 static int kvm_handle_fpu_disabled(struct kvm_vcpu *vcpu, int ecode) 737 { 738 struct kvm_run *run = vcpu->run; 739 740 if (!kvm_guest_has_fpu(&vcpu->arch)) { 741 kvm_queue_exception(vcpu, EXCCODE_INE, 0); 742 return RESUME_GUEST; 743 } 744 745 /* 746 * If guest FPU not present, the FPU operation should have been 747 * treated as a reserved instruction! 748 * If FPU already in use, we shouldn't get this at all. 749 */ 750 if (WARN_ON(vcpu->arch.aux_inuse & KVM_LARCH_FPU)) { 751 kvm_err("%s internal error\n", __func__); 752 run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 753 return RESUME_HOST; 754 } 755 756 kvm_own_fpu(vcpu); 757 758 return RESUME_GUEST; 759 } 760 761 static long kvm_save_notify(struct kvm_vcpu *vcpu) 762 { 763 unsigned long id, data; 764 765 id = kvm_read_reg(vcpu, LOONGARCH_GPR_A1); 766 data = kvm_read_reg(vcpu, LOONGARCH_GPR_A2); 767 switch (id) { 768 case BIT(KVM_FEATURE_STEAL_TIME): 769 if (data & ~(KVM_STEAL_PHYS_MASK | KVM_STEAL_PHYS_VALID)) 770 return KVM_HCALL_INVALID_PARAMETER; 771 772 vcpu->arch.st.guest_addr = data; 773 if (!(data & KVM_STEAL_PHYS_VALID)) 774 return 0; 775 776 vcpu->arch.st.last_steal = current->sched_info.run_delay; 777 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu); 778 return 0; 779 default: 780 return KVM_HCALL_INVALID_CODE; 781 }; 782 783 return KVM_HCALL_INVALID_CODE; 784 }; 785 786 /* 787 * kvm_handle_lsx_disabled() - Guest used LSX while disabled in root. 788 * @vcpu: Virtual CPU context. 789 * @ecode: Exception code. 790 * 791 * Handle when the guest attempts to use LSX when it is disabled in the root 792 * context. 793 */ 794 static int kvm_handle_lsx_disabled(struct kvm_vcpu *vcpu, int ecode) 795 { 796 if (kvm_own_lsx(vcpu)) 797 kvm_queue_exception(vcpu, EXCCODE_INE, 0); 798 799 return RESUME_GUEST; 800 } 801 802 /* 803 * kvm_handle_lasx_disabled() - Guest used LASX while disabled in root. 804 * @vcpu: Virtual CPU context. 805 * @ecode: Exception code. 806 * 807 * Handle when the guest attempts to use LASX when it is disabled in the root 808 * context. 809 */ 810 static int kvm_handle_lasx_disabled(struct kvm_vcpu *vcpu, int ecode) 811 { 812 if (kvm_own_lasx(vcpu)) 813 kvm_queue_exception(vcpu, EXCCODE_INE, 0); 814 815 return RESUME_GUEST; 816 } 817 818 static int kvm_handle_lbt_disabled(struct kvm_vcpu *vcpu, int ecode) 819 { 820 if (kvm_own_lbt(vcpu)) 821 kvm_queue_exception(vcpu, EXCCODE_INE, 0); 822 823 return RESUME_GUEST; 824 } 825 826 static void kvm_send_pv_ipi(struct kvm_vcpu *vcpu) 827 { 828 unsigned int min, cpu; 829 struct kvm_vcpu *dest; 830 DECLARE_BITMAP(ipi_bitmap, BITS_PER_LONG * 2) = { 831 kvm_read_reg(vcpu, LOONGARCH_GPR_A1), 832 kvm_read_reg(vcpu, LOONGARCH_GPR_A2) 833 }; 834 835 min = kvm_read_reg(vcpu, LOONGARCH_GPR_A3); 836 for_each_set_bit(cpu, ipi_bitmap, BITS_PER_LONG * 2) { 837 dest = kvm_get_vcpu_by_cpuid(vcpu->kvm, cpu + min); 838 if (!dest) 839 continue; 840 841 /* Send SWI0 to dest vcpu to emulate IPI interrupt */ 842 kvm_queue_irq(dest, INT_SWI0); 843 kvm_vcpu_kick(dest); 844 } 845 } 846 847 /* 848 * Hypercall emulation always return to guest, Caller should check retval. 849 */ 850 static void kvm_handle_service(struct kvm_vcpu *vcpu) 851 { 852 long ret = KVM_HCALL_INVALID_CODE; 853 unsigned long func = kvm_read_reg(vcpu, LOONGARCH_GPR_A0); 854 855 switch (func) { 856 case KVM_HCALL_FUNC_IPI: 857 if (kvm_guest_has_pv_feature(vcpu, KVM_FEATURE_IPI)) { 858 kvm_send_pv_ipi(vcpu); 859 ret = KVM_HCALL_SUCCESS; 860 } 861 break; 862 case KVM_HCALL_FUNC_NOTIFY: 863 if (kvm_guest_has_pv_feature(vcpu, KVM_FEATURE_STEAL_TIME)) 864 ret = kvm_save_notify(vcpu); 865 break; 866 default: 867 break; 868 } 869 870 kvm_write_reg(vcpu, LOONGARCH_GPR_A0, ret); 871 } 872 873 static int kvm_handle_hypercall(struct kvm_vcpu *vcpu, int ecode) 874 { 875 int ret; 876 larch_inst inst; 877 unsigned int code; 878 879 inst.word = vcpu->arch.badi; 880 code = inst.reg0i15_format.immediate; 881 ret = RESUME_GUEST; 882 883 switch (code) { 884 case KVM_HCALL_SERVICE: 885 vcpu->stat.hypercall_exits++; 886 kvm_handle_service(vcpu); 887 break; 888 case KVM_HCALL_USER_SERVICE: 889 if (!kvm_guest_has_pv_feature(vcpu, KVM_FEATURE_USER_HCALL)) { 890 kvm_write_reg(vcpu, LOONGARCH_GPR_A0, KVM_HCALL_INVALID_CODE); 891 break; 892 } 893 894 vcpu->stat.hypercall_exits++; 895 vcpu->run->exit_reason = KVM_EXIT_HYPERCALL; 896 vcpu->run->hypercall.nr = KVM_HCALL_USER_SERVICE; 897 vcpu->run->hypercall.args[0] = kvm_read_reg(vcpu, LOONGARCH_GPR_A0); 898 vcpu->run->hypercall.args[1] = kvm_read_reg(vcpu, LOONGARCH_GPR_A1); 899 vcpu->run->hypercall.args[2] = kvm_read_reg(vcpu, LOONGARCH_GPR_A2); 900 vcpu->run->hypercall.args[3] = kvm_read_reg(vcpu, LOONGARCH_GPR_A3); 901 vcpu->run->hypercall.args[4] = kvm_read_reg(vcpu, LOONGARCH_GPR_A4); 902 vcpu->run->hypercall.args[5] = kvm_read_reg(vcpu, LOONGARCH_GPR_A5); 903 vcpu->run->hypercall.flags = 0; 904 /* 905 * Set invalid return value by default, let user-mode VMM modify it. 906 */ 907 vcpu->run->hypercall.ret = KVM_HCALL_INVALID_CODE; 908 ret = RESUME_HOST; 909 break; 910 case KVM_HCALL_SWDBG: 911 /* KVM_HCALL_SWDBG only in effective when SW_BP is enabled */ 912 if (vcpu->guest_debug & KVM_GUESTDBG_SW_BP_MASK) { 913 vcpu->run->exit_reason = KVM_EXIT_DEBUG; 914 ret = RESUME_HOST; 915 break; 916 } 917 fallthrough; 918 default: 919 /* Treat it as noop intruction, only set return value */ 920 kvm_write_reg(vcpu, LOONGARCH_GPR_A0, KVM_HCALL_INVALID_CODE); 921 break; 922 } 923 924 if (ret == RESUME_GUEST) 925 update_pc(&vcpu->arch); 926 927 return ret; 928 } 929 930 /* 931 * LoongArch KVM callback handling for unimplemented guest exiting 932 */ 933 static int kvm_fault_ni(struct kvm_vcpu *vcpu, int ecode) 934 { 935 unsigned int inst; 936 unsigned long badv; 937 938 /* Fetch the instruction */ 939 inst = vcpu->arch.badi; 940 badv = vcpu->arch.badv; 941 kvm_err("ECode: %d PC=%#lx Inst=0x%08x BadVaddr=%#lx ESTAT=%#lx\n", 942 ecode, vcpu->arch.pc, inst, badv, read_gcsr_estat()); 943 kvm_arch_vcpu_dump_regs(vcpu); 944 kvm_queue_exception(vcpu, EXCCODE_INE, 0); 945 946 return RESUME_GUEST; 947 } 948 949 static exit_handle_fn kvm_fault_tables[EXCCODE_INT_START] = { 950 [0 ... EXCCODE_INT_START - 1] = kvm_fault_ni, 951 [EXCCODE_TLBI] = kvm_handle_read_fault, 952 [EXCCODE_TLBL] = kvm_handle_read_fault, 953 [EXCCODE_TLBS] = kvm_handle_write_fault, 954 [EXCCODE_TLBM] = kvm_handle_write_fault, 955 [EXCCODE_FPDIS] = kvm_handle_fpu_disabled, 956 [EXCCODE_LSXDIS] = kvm_handle_lsx_disabled, 957 [EXCCODE_LASXDIS] = kvm_handle_lasx_disabled, 958 [EXCCODE_BTDIS] = kvm_handle_lbt_disabled, 959 [EXCCODE_GSPR] = kvm_handle_gspr, 960 [EXCCODE_HVC] = kvm_handle_hypercall, 961 }; 962 963 int kvm_handle_fault(struct kvm_vcpu *vcpu, int fault) 964 { 965 return kvm_fault_tables[fault](vcpu, fault); 966 } 967