nvmm.c revision 1.26
1 /* $NetBSD: nvmm.c,v 1.26 2020/04/26 19:31:36 maxv Exp $ */ 2 3 /* 4 * Copyright (c) 2018-2019 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Maxime Villard. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: nvmm.c,v 1.26 2020/04/26 19:31:36 maxv Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 39 #include <sys/cpu.h> 40 #include <sys/conf.h> 41 #include <sys/kmem.h> 42 #include <sys/module.h> 43 #include <sys/proc.h> 44 #include <sys/mman.h> 45 #include <sys/file.h> 46 #include <sys/filedesc.h> 47 #include <sys/kauth.h> 48 49 #include <uvm/uvm.h> 50 #include <uvm/uvm_page.h> 51 52 #include "ioconf.h" 53 54 #include <dev/nvmm/nvmm.h> 55 #include <dev/nvmm/nvmm_internal.h> 56 #include <dev/nvmm/nvmm_ioctl.h> 57 58 static struct nvmm_machine machines[NVMM_MAX_MACHINES]; 59 static volatile unsigned int nmachines __cacheline_aligned; 60 61 static const struct nvmm_impl *nvmm_impl_list[] = { 62 &nvmm_x86_svm, /* x86 AMD SVM */ 63 &nvmm_x86_vmx /* x86 Intel VMX */ 64 }; 65 66 static const struct nvmm_impl *nvmm_impl = NULL; 67 68 static struct nvmm_owner root_owner; 69 70 /* -------------------------------------------------------------------------- */ 71 72 static int 73 nvmm_machine_alloc(struct nvmm_machine **ret) 74 { 75 struct nvmm_machine *mach; 76 size_t i; 77 78 for (i = 0; i < NVMM_MAX_MACHINES; i++) { 79 mach = &machines[i]; 80 81 rw_enter(&mach->lock, RW_WRITER); 82 if (mach->present) { 83 rw_exit(&mach->lock); 84 continue; 85 } 86 87 mach->present = true; 88 mach->time = time_second; 89 *ret = mach; 90 atomic_inc_uint(&nmachines); 91 return 0; 92 } 93 94 return ENOBUFS; 95 } 96 97 static void 98 nvmm_machine_free(struct nvmm_machine *mach) 99 { 100 KASSERT(rw_write_held(&mach->lock)); 101 KASSERT(mach->present); 102 mach->present = false; 103 atomic_dec_uint(&nmachines); 104 } 105 106 static int 107 nvmm_machine_get(struct nvmm_owner *owner, nvmm_machid_t machid, 108 struct nvmm_machine **ret, bool writer) 109 { 110 struct nvmm_machine *mach; 111 krw_t op = writer ? RW_WRITER : RW_READER; 112 113 if (machid >= NVMM_MAX_MACHINES) { 114 return EINVAL; 115 } 116 mach = &machines[machid]; 117 118 rw_enter(&mach->lock, op); 119 if (!mach->present) { 120 rw_exit(&mach->lock); 121 return ENOENT; 122 } 123 if (owner != &root_owner && mach->owner != owner) { 124 rw_exit(&mach->lock); 125 return EPERM; 126 } 127 *ret = mach; 128 129 return 0; 130 } 131 132 static void 133 nvmm_machine_put(struct nvmm_machine *mach) 134 { 135 rw_exit(&mach->lock); 136 } 137 138 /* -------------------------------------------------------------------------- */ 139 140 static int 141 nvmm_vcpu_alloc(struct nvmm_machine *mach, nvmm_cpuid_t cpuid, 142 struct nvmm_cpu **ret) 143 { 144 struct nvmm_cpu *vcpu; 145 146 if (cpuid >= NVMM_MAX_VCPUS) { 147 return EINVAL; 148 } 149 vcpu = &mach->cpus[cpuid]; 150 151 mutex_enter(&vcpu->lock); 152 if (vcpu->present) { 153 mutex_exit(&vcpu->lock); 154 return EBUSY; 155 } 156 157 vcpu->present = true; 158 vcpu->comm = NULL; 159 vcpu->hcpu_last = -1; 160 *ret = vcpu; 161 return 0; 162 } 163 164 static void 165 nvmm_vcpu_free(struct nvmm_machine *mach, struct nvmm_cpu *vcpu) 166 { 167 KASSERT(mutex_owned(&vcpu->lock)); 168 vcpu->present = false; 169 if (vcpu->comm != NULL) { 170 uvm_deallocate(kernel_map, (vaddr_t)vcpu->comm, PAGE_SIZE); 171 } 172 } 173 174 static int 175 nvmm_vcpu_get(struct nvmm_machine *mach, nvmm_cpuid_t cpuid, 176 struct nvmm_cpu **ret) 177 { 178 struct nvmm_cpu *vcpu; 179 180 if (cpuid >= NVMM_MAX_VCPUS) { 181 return EINVAL; 182 } 183 vcpu = &mach->cpus[cpuid]; 184 185 mutex_enter(&vcpu->lock); 186 if (!vcpu->present) { 187 mutex_exit(&vcpu->lock); 188 return ENOENT; 189 } 190 *ret = vcpu; 191 192 return 0; 193 } 194 195 static void 196 nvmm_vcpu_put(struct nvmm_cpu *vcpu) 197 { 198 mutex_exit(&vcpu->lock); 199 } 200 201 /* -------------------------------------------------------------------------- */ 202 203 static void 204 nvmm_kill_machines(struct nvmm_owner *owner) 205 { 206 struct nvmm_machine *mach; 207 struct nvmm_cpu *vcpu; 208 size_t i, j; 209 int error; 210 211 for (i = 0; i < NVMM_MAX_MACHINES; i++) { 212 mach = &machines[i]; 213 214 rw_enter(&mach->lock, RW_WRITER); 215 if (!mach->present || mach->owner != owner) { 216 rw_exit(&mach->lock); 217 continue; 218 } 219 220 /* Kill it. */ 221 for (j = 0; j < NVMM_MAX_VCPUS; j++) { 222 error = nvmm_vcpu_get(mach, j, &vcpu); 223 if (error) 224 continue; 225 (*nvmm_impl->vcpu_destroy)(mach, vcpu); 226 nvmm_vcpu_free(mach, vcpu); 227 nvmm_vcpu_put(vcpu); 228 } 229 (*nvmm_impl->machine_destroy)(mach); 230 uvmspace_free(mach->vm); 231 232 /* Drop the kernel UOBJ refs. */ 233 for (j = 0; j < NVMM_MAX_HMAPPINGS; j++) { 234 if (!mach->hmap[j].present) 235 continue; 236 uao_detach(mach->hmap[j].uobj); 237 } 238 239 nvmm_machine_free(mach); 240 241 rw_exit(&mach->lock); 242 } 243 } 244 245 /* -------------------------------------------------------------------------- */ 246 247 static int 248 nvmm_capability(struct nvmm_owner *owner, struct nvmm_ioc_capability *args) 249 { 250 args->cap.version = NVMM_KERN_VERSION; 251 args->cap.state_size = nvmm_impl->state_size; 252 args->cap.max_machines = NVMM_MAX_MACHINES; 253 args->cap.max_vcpus = NVMM_MAX_VCPUS; 254 args->cap.max_ram = NVMM_MAX_RAM; 255 256 (*nvmm_impl->capability)(&args->cap); 257 258 return 0; 259 } 260 261 static int 262 nvmm_machine_create(struct nvmm_owner *owner, 263 struct nvmm_ioc_machine_create *args) 264 { 265 struct nvmm_machine *mach; 266 int error; 267 268 error = nvmm_machine_alloc(&mach); 269 if (error) 270 return error; 271 272 /* Curproc owns the machine. */ 273 mach->owner = owner; 274 275 /* Zero out the host mappings. */ 276 memset(&mach->hmap, 0, sizeof(mach->hmap)); 277 278 /* Create the machine vmspace. */ 279 mach->gpa_begin = 0; 280 mach->gpa_end = NVMM_MAX_RAM; 281 mach->vm = uvmspace_alloc(0, mach->gpa_end - mach->gpa_begin, false); 282 283 /* Create the comm uobj. */ 284 mach->commuobj = uao_create(NVMM_MAX_VCPUS * PAGE_SIZE, 0); 285 286 (*nvmm_impl->machine_create)(mach); 287 288 args->machid = mach->machid; 289 nvmm_machine_put(mach); 290 291 return 0; 292 } 293 294 static int 295 nvmm_machine_destroy(struct nvmm_owner *owner, 296 struct nvmm_ioc_machine_destroy *args) 297 { 298 struct nvmm_machine *mach; 299 struct nvmm_cpu *vcpu; 300 int error; 301 size_t i; 302 303 error = nvmm_machine_get(owner, args->machid, &mach, true); 304 if (error) 305 return error; 306 307 for (i = 0; i < NVMM_MAX_VCPUS; i++) { 308 error = nvmm_vcpu_get(mach, i, &vcpu); 309 if (error) 310 continue; 311 312 (*nvmm_impl->vcpu_destroy)(mach, vcpu); 313 nvmm_vcpu_free(mach, vcpu); 314 nvmm_vcpu_put(vcpu); 315 } 316 317 (*nvmm_impl->machine_destroy)(mach); 318 319 /* Free the machine vmspace. */ 320 uvmspace_free(mach->vm); 321 322 /* Drop the kernel UOBJ refs. */ 323 for (i = 0; i < NVMM_MAX_HMAPPINGS; i++) { 324 if (!mach->hmap[i].present) 325 continue; 326 uao_detach(mach->hmap[i].uobj); 327 } 328 329 nvmm_machine_free(mach); 330 nvmm_machine_put(mach); 331 332 return 0; 333 } 334 335 static int 336 nvmm_machine_configure(struct nvmm_owner *owner, 337 struct nvmm_ioc_machine_configure *args) 338 { 339 struct nvmm_machine *mach; 340 size_t allocsz; 341 uint64_t op; 342 void *data; 343 int error; 344 345 op = NVMM_MACH_CONF_MD(args->op); 346 if (__predict_false(op >= nvmm_impl->mach_conf_max)) { 347 return EINVAL; 348 } 349 350 allocsz = nvmm_impl->mach_conf_sizes[op]; 351 data = kmem_alloc(allocsz, KM_SLEEP); 352 353 error = nvmm_machine_get(owner, args->machid, &mach, true); 354 if (error) { 355 kmem_free(data, allocsz); 356 return error; 357 } 358 359 error = copyin(args->conf, data, allocsz); 360 if (error) { 361 goto out; 362 } 363 364 error = (*nvmm_impl->machine_configure)(mach, op, data); 365 366 out: 367 nvmm_machine_put(mach); 368 kmem_free(data, allocsz); 369 return error; 370 } 371 372 static int 373 nvmm_vcpu_create(struct nvmm_owner *owner, struct nvmm_ioc_vcpu_create *args) 374 { 375 struct nvmm_machine *mach; 376 struct nvmm_cpu *vcpu; 377 int error; 378 379 error = nvmm_machine_get(owner, args->machid, &mach, false); 380 if (error) 381 return error; 382 383 error = nvmm_vcpu_alloc(mach, args->cpuid, &vcpu); 384 if (error) 385 goto out; 386 387 /* Allocate the comm page. */ 388 uao_reference(mach->commuobj); 389 error = uvm_map(kernel_map, (vaddr_t *)&vcpu->comm, PAGE_SIZE, 390 mach->commuobj, args->cpuid * PAGE_SIZE, 0, UVM_MAPFLAG(UVM_PROT_RW, 391 UVM_PROT_RW, UVM_INH_SHARE, UVM_ADV_RANDOM, 0)); 392 if (error) { 393 uao_detach(mach->commuobj); 394 nvmm_vcpu_free(mach, vcpu); 395 nvmm_vcpu_put(vcpu); 396 goto out; 397 } 398 error = uvm_map_pageable(kernel_map, (vaddr_t)vcpu->comm, 399 (vaddr_t)vcpu->comm + PAGE_SIZE, false, 0); 400 if (error) { 401 nvmm_vcpu_free(mach, vcpu); 402 nvmm_vcpu_put(vcpu); 403 goto out; 404 } 405 memset(vcpu->comm, 0, PAGE_SIZE); 406 407 error = (*nvmm_impl->vcpu_create)(mach, vcpu); 408 if (error) { 409 nvmm_vcpu_free(mach, vcpu); 410 nvmm_vcpu_put(vcpu); 411 goto out; 412 } 413 414 nvmm_vcpu_put(vcpu); 415 416 out: 417 nvmm_machine_put(mach); 418 return error; 419 } 420 421 static int 422 nvmm_vcpu_destroy(struct nvmm_owner *owner, struct nvmm_ioc_vcpu_destroy *args) 423 { 424 struct nvmm_machine *mach; 425 struct nvmm_cpu *vcpu; 426 int error; 427 428 error = nvmm_machine_get(owner, args->machid, &mach, false); 429 if (error) 430 return error; 431 432 error = nvmm_vcpu_get(mach, args->cpuid, &vcpu); 433 if (error) 434 goto out; 435 436 (*nvmm_impl->vcpu_destroy)(mach, vcpu); 437 nvmm_vcpu_free(mach, vcpu); 438 nvmm_vcpu_put(vcpu); 439 440 out: 441 nvmm_machine_put(mach); 442 return error; 443 } 444 445 static int 446 nvmm_vcpu_configure(struct nvmm_owner *owner, 447 struct nvmm_ioc_vcpu_configure *args) 448 { 449 struct nvmm_machine *mach; 450 struct nvmm_cpu *vcpu; 451 size_t allocsz; 452 uint64_t op; 453 void *data; 454 int error; 455 456 op = NVMM_VCPU_CONF_MD(args->op); 457 if (__predict_false(op >= nvmm_impl->vcpu_conf_max)) 458 return EINVAL; 459 460 allocsz = nvmm_impl->vcpu_conf_sizes[op]; 461 data = kmem_alloc(allocsz, KM_SLEEP); 462 463 error = nvmm_machine_get(owner, args->machid, &mach, false); 464 if (error) { 465 kmem_free(data, allocsz); 466 return error; 467 } 468 469 error = nvmm_vcpu_get(mach, args->cpuid, &vcpu); 470 if (error) { 471 nvmm_machine_put(mach); 472 kmem_free(data, allocsz); 473 return error; 474 } 475 476 error = copyin(args->conf, data, allocsz); 477 if (error) { 478 goto out; 479 } 480 481 error = (*nvmm_impl->vcpu_configure)(vcpu, op, data); 482 483 out: 484 nvmm_vcpu_put(vcpu); 485 nvmm_machine_put(mach); 486 kmem_free(data, allocsz); 487 return error; 488 } 489 490 static int 491 nvmm_vcpu_setstate(struct nvmm_owner *owner, 492 struct nvmm_ioc_vcpu_setstate *args) 493 { 494 struct nvmm_machine *mach; 495 struct nvmm_cpu *vcpu; 496 int error; 497 498 error = nvmm_machine_get(owner, args->machid, &mach, false); 499 if (error) 500 return error; 501 502 error = nvmm_vcpu_get(mach, args->cpuid, &vcpu); 503 if (error) 504 goto out; 505 506 (*nvmm_impl->vcpu_setstate)(vcpu); 507 nvmm_vcpu_put(vcpu); 508 509 out: 510 nvmm_machine_put(mach); 511 return error; 512 } 513 514 static int 515 nvmm_vcpu_getstate(struct nvmm_owner *owner, 516 struct nvmm_ioc_vcpu_getstate *args) 517 { 518 struct nvmm_machine *mach; 519 struct nvmm_cpu *vcpu; 520 int error; 521 522 error = nvmm_machine_get(owner, args->machid, &mach, false); 523 if (error) 524 return error; 525 526 error = nvmm_vcpu_get(mach, args->cpuid, &vcpu); 527 if (error) 528 goto out; 529 530 (*nvmm_impl->vcpu_getstate)(vcpu); 531 nvmm_vcpu_put(vcpu); 532 533 out: 534 nvmm_machine_put(mach); 535 return error; 536 } 537 538 static int 539 nvmm_vcpu_inject(struct nvmm_owner *owner, struct nvmm_ioc_vcpu_inject *args) 540 { 541 struct nvmm_machine *mach; 542 struct nvmm_cpu *vcpu; 543 int error; 544 545 error = nvmm_machine_get(owner, args->machid, &mach, false); 546 if (error) 547 return error; 548 549 error = nvmm_vcpu_get(mach, args->cpuid, &vcpu); 550 if (error) 551 goto out; 552 553 error = (*nvmm_impl->vcpu_inject)(vcpu); 554 nvmm_vcpu_put(vcpu); 555 556 out: 557 nvmm_machine_put(mach); 558 return error; 559 } 560 561 static int 562 nvmm_do_vcpu_run(struct nvmm_machine *mach, struct nvmm_cpu *vcpu, 563 struct nvmm_vcpu_exit *exit) 564 { 565 struct vmspace *vm = mach->vm; 566 int ret; 567 568 while (1) { 569 ret = (*nvmm_impl->vcpu_run)(mach, vcpu, exit); 570 if (__predict_false(ret != 0)) { 571 return ret; 572 } 573 574 if (__predict_true(exit->reason != NVMM_VCPU_EXIT_MEMORY)) { 575 break; 576 } 577 if (exit->u.mem.gpa >= mach->gpa_end) { 578 break; 579 } 580 if (uvm_fault(&vm->vm_map, exit->u.mem.gpa, exit->u.mem.prot)) { 581 break; 582 } 583 } 584 585 return 0; 586 } 587 588 static int 589 nvmm_vcpu_run(struct nvmm_owner *owner, struct nvmm_ioc_vcpu_run *args) 590 { 591 struct nvmm_machine *mach; 592 struct nvmm_cpu *vcpu; 593 int error; 594 595 error = nvmm_machine_get(owner, args->machid, &mach, false); 596 if (error) 597 return error; 598 599 error = nvmm_vcpu_get(mach, args->cpuid, &vcpu); 600 if (error) 601 goto out; 602 603 error = nvmm_do_vcpu_run(mach, vcpu, &args->exit); 604 nvmm_vcpu_put(vcpu); 605 606 out: 607 nvmm_machine_put(mach); 608 return error; 609 } 610 611 /* -------------------------------------------------------------------------- */ 612 613 static struct uvm_object * 614 nvmm_hmapping_getuobj(struct nvmm_machine *mach, uintptr_t hva, size_t size, 615 size_t *off) 616 { 617 struct nvmm_hmapping *hmapping; 618 size_t i; 619 620 for (i = 0; i < NVMM_MAX_HMAPPINGS; i++) { 621 hmapping = &mach->hmap[i]; 622 if (!hmapping->present) { 623 continue; 624 } 625 if (hva >= hmapping->hva && 626 hva + size <= hmapping->hva + hmapping->size) { 627 *off = hva - hmapping->hva; 628 return hmapping->uobj; 629 } 630 } 631 632 return NULL; 633 } 634 635 static int 636 nvmm_hmapping_validate(struct nvmm_machine *mach, uintptr_t hva, size_t size) 637 { 638 struct nvmm_hmapping *hmapping; 639 size_t i; 640 641 if ((hva % PAGE_SIZE) != 0 || (size % PAGE_SIZE) != 0) { 642 return EINVAL; 643 } 644 if (hva == 0) { 645 return EINVAL; 646 } 647 648 for (i = 0; i < NVMM_MAX_HMAPPINGS; i++) { 649 hmapping = &mach->hmap[i]; 650 if (!hmapping->present) { 651 continue; 652 } 653 654 if (hva >= hmapping->hva && 655 hva + size <= hmapping->hva + hmapping->size) { 656 break; 657 } 658 659 if (hva >= hmapping->hva && 660 hva < hmapping->hva + hmapping->size) { 661 return EEXIST; 662 } 663 if (hva + size > hmapping->hva && 664 hva + size <= hmapping->hva + hmapping->size) { 665 return EEXIST; 666 } 667 if (hva <= hmapping->hva && 668 hva + size >= hmapping->hva + hmapping->size) { 669 return EEXIST; 670 } 671 } 672 673 return 0; 674 } 675 676 static struct nvmm_hmapping * 677 nvmm_hmapping_alloc(struct nvmm_machine *mach) 678 { 679 struct nvmm_hmapping *hmapping; 680 size_t i; 681 682 for (i = 0; i < NVMM_MAX_HMAPPINGS; i++) { 683 hmapping = &mach->hmap[i]; 684 if (!hmapping->present) { 685 hmapping->present = true; 686 return hmapping; 687 } 688 } 689 690 return NULL; 691 } 692 693 static int 694 nvmm_hmapping_free(struct nvmm_machine *mach, uintptr_t hva, size_t size) 695 { 696 struct vmspace *vmspace = curproc->p_vmspace; 697 struct nvmm_hmapping *hmapping; 698 size_t i; 699 700 for (i = 0; i < NVMM_MAX_HMAPPINGS; i++) { 701 hmapping = &mach->hmap[i]; 702 if (!hmapping->present || hmapping->hva != hva || 703 hmapping->size != size) { 704 continue; 705 } 706 707 uvm_unmap(&vmspace->vm_map, hmapping->hva, 708 hmapping->hva + hmapping->size); 709 uao_detach(hmapping->uobj); 710 711 hmapping->uobj = NULL; 712 hmapping->present = false; 713 714 return 0; 715 } 716 717 return ENOENT; 718 } 719 720 static int 721 nvmm_hva_map(struct nvmm_owner *owner, struct nvmm_ioc_hva_map *args) 722 { 723 struct vmspace *vmspace = curproc->p_vmspace; 724 struct nvmm_machine *mach; 725 struct nvmm_hmapping *hmapping; 726 vaddr_t uva; 727 int error; 728 729 error = nvmm_machine_get(owner, args->machid, &mach, true); 730 if (error) 731 return error; 732 733 error = nvmm_hmapping_validate(mach, args->hva, args->size); 734 if (error) 735 goto out; 736 737 hmapping = nvmm_hmapping_alloc(mach); 738 if (hmapping == NULL) { 739 error = ENOBUFS; 740 goto out; 741 } 742 743 hmapping->hva = args->hva; 744 hmapping->size = args->size; 745 hmapping->uobj = uao_create(hmapping->size, 0); 746 uva = hmapping->hva; 747 748 /* Take a reference for the user. */ 749 uao_reference(hmapping->uobj); 750 751 /* Map the uobj into the user address space, as pageable. */ 752 error = uvm_map(&vmspace->vm_map, &uva, hmapping->size, hmapping->uobj, 753 0, 0, UVM_MAPFLAG(UVM_PROT_RW, UVM_PROT_RW, UVM_INH_SHARE, 754 UVM_ADV_RANDOM, UVM_FLAG_FIXED|UVM_FLAG_UNMAP)); 755 if (error) { 756 uao_detach(hmapping->uobj); 757 } 758 759 out: 760 nvmm_machine_put(mach); 761 return error; 762 } 763 764 static int 765 nvmm_hva_unmap(struct nvmm_owner *owner, struct nvmm_ioc_hva_unmap *args) 766 { 767 struct nvmm_machine *mach; 768 int error; 769 770 error = nvmm_machine_get(owner, args->machid, &mach, true); 771 if (error) 772 return error; 773 774 error = nvmm_hmapping_free(mach, args->hva, args->size); 775 776 nvmm_machine_put(mach); 777 return error; 778 } 779 780 /* -------------------------------------------------------------------------- */ 781 782 static int 783 nvmm_gpa_map(struct nvmm_owner *owner, struct nvmm_ioc_gpa_map *args) 784 { 785 struct nvmm_machine *mach; 786 struct uvm_object *uobj; 787 gpaddr_t gpa; 788 size_t off; 789 int error; 790 791 error = nvmm_machine_get(owner, args->machid, &mach, false); 792 if (error) 793 return error; 794 795 if ((args->prot & ~(PROT_READ|PROT_WRITE|PROT_EXEC)) != 0) { 796 error = EINVAL; 797 goto out; 798 } 799 800 if ((args->gpa % PAGE_SIZE) != 0 || (args->size % PAGE_SIZE) != 0 || 801 (args->hva % PAGE_SIZE) != 0) { 802 error = EINVAL; 803 goto out; 804 } 805 if (args->hva == 0) { 806 error = EINVAL; 807 goto out; 808 } 809 if (args->gpa < mach->gpa_begin || args->gpa >= mach->gpa_end) { 810 error = EINVAL; 811 goto out; 812 } 813 if (args->gpa + args->size <= args->gpa) { 814 error = EINVAL; 815 goto out; 816 } 817 if (args->gpa + args->size > mach->gpa_end) { 818 error = EINVAL; 819 goto out; 820 } 821 gpa = args->gpa; 822 823 uobj = nvmm_hmapping_getuobj(mach, args->hva, args->size, &off); 824 if (uobj == NULL) { 825 error = EINVAL; 826 goto out; 827 } 828 829 /* Take a reference for the machine. */ 830 uao_reference(uobj); 831 832 /* Map the uobj into the machine address space, as pageable. */ 833 error = uvm_map(&mach->vm->vm_map, &gpa, args->size, uobj, off, 0, 834 UVM_MAPFLAG(args->prot, UVM_PROT_RWX, UVM_INH_NONE, 835 UVM_ADV_RANDOM, UVM_FLAG_FIXED|UVM_FLAG_UNMAP)); 836 if (error) { 837 uao_detach(uobj); 838 goto out; 839 } 840 if (gpa != args->gpa) { 841 uao_detach(uobj); 842 printf("[!] uvm_map problem\n"); 843 error = EINVAL; 844 goto out; 845 } 846 847 out: 848 nvmm_machine_put(mach); 849 return error; 850 } 851 852 static int 853 nvmm_gpa_unmap(struct nvmm_owner *owner, struct nvmm_ioc_gpa_unmap *args) 854 { 855 struct nvmm_machine *mach; 856 gpaddr_t gpa; 857 int error; 858 859 error = nvmm_machine_get(owner, args->machid, &mach, false); 860 if (error) 861 return error; 862 863 if ((args->gpa % PAGE_SIZE) != 0 || (args->size % PAGE_SIZE) != 0) { 864 error = EINVAL; 865 goto out; 866 } 867 if (args->gpa < mach->gpa_begin || args->gpa >= mach->gpa_end) { 868 error = EINVAL; 869 goto out; 870 } 871 if (args->gpa + args->size <= args->gpa) { 872 error = EINVAL; 873 goto out; 874 } 875 if (args->gpa + args->size >= mach->gpa_end) { 876 error = EINVAL; 877 goto out; 878 } 879 gpa = args->gpa; 880 881 /* Unmap the memory from the machine. */ 882 uvm_unmap(&mach->vm->vm_map, gpa, gpa + args->size); 883 884 out: 885 nvmm_machine_put(mach); 886 return error; 887 } 888 889 /* -------------------------------------------------------------------------- */ 890 891 static int 892 nvmm_ctl_mach_info(struct nvmm_owner *owner, struct nvmm_ioc_ctl *args) 893 { 894 struct nvmm_ctl_mach_info ctl; 895 struct nvmm_machine *mach; 896 struct nvmm_cpu *vcpu; 897 int error; 898 size_t i; 899 900 if (args->size != sizeof(ctl)) 901 return EINVAL; 902 error = copyin(args->data, &ctl, sizeof(ctl)); 903 if (error) 904 return error; 905 906 error = nvmm_machine_get(owner, ctl.machid, &mach, true); 907 if (error) 908 return error; 909 910 ctl.nvcpus = 0; 911 for (i = 0; i < NVMM_MAX_VCPUS; i++) { 912 error = nvmm_vcpu_get(mach, i, &vcpu); 913 if (error) 914 continue; 915 ctl.nvcpus++; 916 nvmm_vcpu_put(vcpu); 917 } 918 919 ctl.nram = 0; 920 for (i = 0; i < NVMM_MAX_HMAPPINGS; i++) { 921 if (!mach->hmap[i].present) 922 continue; 923 ctl.nram += mach->hmap[i].size; 924 } 925 926 ctl.pid = mach->owner->pid; 927 ctl.time = mach->time; 928 929 nvmm_machine_put(mach); 930 931 error = copyout(&ctl, args->data, sizeof(ctl)); 932 if (error) 933 return error; 934 935 return 0; 936 } 937 938 static int 939 nvmm_ctl(struct nvmm_owner *owner, struct nvmm_ioc_ctl *args) 940 { 941 switch (args->op) { 942 case NVMM_CTL_MACH_INFO: 943 return nvmm_ctl_mach_info(owner, args); 944 default: 945 return EINVAL; 946 } 947 } 948 949 /* -------------------------------------------------------------------------- */ 950 951 static int 952 nvmm_init(void) 953 { 954 size_t i, n; 955 956 for (i = 0; i < __arraycount(nvmm_impl_list); i++) { 957 if (!(*nvmm_impl_list[i]->ident)()) { 958 continue; 959 } 960 nvmm_impl = nvmm_impl_list[i]; 961 break; 962 } 963 if (nvmm_impl == NULL) { 964 printf("[!] No implementation found\n"); 965 return ENOTSUP; 966 } 967 968 for (i = 0; i < NVMM_MAX_MACHINES; i++) { 969 machines[i].machid = i; 970 rw_init(&machines[i].lock); 971 for (n = 0; n < NVMM_MAX_VCPUS; n++) { 972 machines[i].cpus[n].present = false; 973 machines[i].cpus[n].cpuid = n; 974 mutex_init(&machines[i].cpus[n].lock, MUTEX_DEFAULT, 975 IPL_NONE); 976 } 977 } 978 979 (*nvmm_impl->init)(); 980 981 return 0; 982 } 983 984 static void 985 nvmm_fini(void) 986 { 987 size_t i, n; 988 989 for (i = 0; i < NVMM_MAX_MACHINES; i++) { 990 rw_destroy(&machines[i].lock); 991 for (n = 0; n < NVMM_MAX_VCPUS; n++) { 992 mutex_destroy(&machines[i].cpus[n].lock); 993 } 994 } 995 996 (*nvmm_impl->fini)(); 997 } 998 999 /* -------------------------------------------------------------------------- */ 1000 1001 static dev_type_open(nvmm_open); 1002 1003 const struct cdevsw nvmm_cdevsw = { 1004 .d_open = nvmm_open, 1005 .d_close = noclose, 1006 .d_read = noread, 1007 .d_write = nowrite, 1008 .d_ioctl = noioctl, 1009 .d_stop = nostop, 1010 .d_tty = notty, 1011 .d_poll = nopoll, 1012 .d_mmap = nommap, 1013 .d_kqfilter = nokqfilter, 1014 .d_discard = nodiscard, 1015 .d_flag = D_OTHER | D_MPSAFE 1016 }; 1017 1018 static int nvmm_ioctl(file_t *, u_long, void *); 1019 static int nvmm_close(file_t *); 1020 static int nvmm_mmap(file_t *, off_t *, size_t, int, int *, int *, 1021 struct uvm_object **, int *); 1022 1023 const struct fileops nvmm_fileops = { 1024 .fo_read = fbadop_read, 1025 .fo_write = fbadop_write, 1026 .fo_ioctl = nvmm_ioctl, 1027 .fo_fcntl = fnullop_fcntl, 1028 .fo_poll = fnullop_poll, 1029 .fo_stat = fbadop_stat, 1030 .fo_close = nvmm_close, 1031 .fo_kqfilter = fnullop_kqfilter, 1032 .fo_restart = fnullop_restart, 1033 .fo_mmap = nvmm_mmap, 1034 }; 1035 1036 static int 1037 nvmm_open(dev_t dev, int flags, int type, struct lwp *l) 1038 { 1039 struct nvmm_owner *owner; 1040 struct file *fp; 1041 int error, fd; 1042 1043 if (__predict_false(nvmm_impl == NULL)) 1044 return ENXIO; 1045 if (minor(dev) != 0) 1046 return EXDEV; 1047 if (!(flags & O_CLOEXEC)) 1048 return EINVAL; 1049 error = fd_allocfile(&fp, &fd); 1050 if (error) 1051 return error; 1052 1053 if (OFLAGS(flags) & O_WRONLY) { 1054 owner = &root_owner; 1055 } else { 1056 owner = kmem_alloc(sizeof(*owner), KM_SLEEP); 1057 owner->pid = l->l_proc->p_pid; 1058 } 1059 1060 return fd_clone(fp, fd, flags, &nvmm_fileops, owner); 1061 } 1062 1063 static int 1064 nvmm_close(file_t *fp) 1065 { 1066 struct nvmm_owner *owner = fp->f_data; 1067 1068 KASSERT(owner != NULL); 1069 nvmm_kill_machines(owner); 1070 if (owner != &root_owner) { 1071 kmem_free(owner, sizeof(*owner)); 1072 } 1073 fp->f_data = NULL; 1074 1075 return 0; 1076 } 1077 1078 static int 1079 nvmm_mmap(file_t *fp, off_t *offp, size_t size, int prot, int *flagsp, 1080 int *advicep, struct uvm_object **uobjp, int *maxprotp) 1081 { 1082 struct nvmm_owner *owner = fp->f_data; 1083 struct nvmm_machine *mach; 1084 nvmm_machid_t machid; 1085 nvmm_cpuid_t cpuid; 1086 int error; 1087 1088 if (prot & PROT_EXEC) 1089 return EACCES; 1090 if (size != PAGE_SIZE) 1091 return EINVAL; 1092 1093 cpuid = NVMM_COMM_CPUID(*offp); 1094 if (__predict_false(cpuid >= NVMM_MAX_VCPUS)) 1095 return EINVAL; 1096 1097 machid = NVMM_COMM_MACHID(*offp); 1098 error = nvmm_machine_get(owner, machid, &mach, false); 1099 if (error) 1100 return error; 1101 1102 uao_reference(mach->commuobj); 1103 *uobjp = mach->commuobj; 1104 *offp = cpuid * PAGE_SIZE; 1105 *maxprotp = prot; 1106 *advicep = UVM_ADV_RANDOM; 1107 1108 nvmm_machine_put(mach); 1109 return 0; 1110 } 1111 1112 static int 1113 nvmm_ioctl(file_t *fp, u_long cmd, void *data) 1114 { 1115 struct nvmm_owner *owner = fp->f_data; 1116 1117 KASSERT(owner != NULL); 1118 1119 switch (cmd) { 1120 case NVMM_IOC_CAPABILITY: 1121 return nvmm_capability(owner, data); 1122 case NVMM_IOC_MACHINE_CREATE: 1123 return nvmm_machine_create(owner, data); 1124 case NVMM_IOC_MACHINE_DESTROY: 1125 return nvmm_machine_destroy(owner, data); 1126 case NVMM_IOC_MACHINE_CONFIGURE: 1127 return nvmm_machine_configure(owner, data); 1128 case NVMM_IOC_VCPU_CREATE: 1129 return nvmm_vcpu_create(owner, data); 1130 case NVMM_IOC_VCPU_DESTROY: 1131 return nvmm_vcpu_destroy(owner, data); 1132 case NVMM_IOC_VCPU_CONFIGURE: 1133 return nvmm_vcpu_configure(owner, data); 1134 case NVMM_IOC_VCPU_SETSTATE: 1135 return nvmm_vcpu_setstate(owner, data); 1136 case NVMM_IOC_VCPU_GETSTATE: 1137 return nvmm_vcpu_getstate(owner, data); 1138 case NVMM_IOC_VCPU_INJECT: 1139 return nvmm_vcpu_inject(owner, data); 1140 case NVMM_IOC_VCPU_RUN: 1141 return nvmm_vcpu_run(owner, data); 1142 case NVMM_IOC_GPA_MAP: 1143 return nvmm_gpa_map(owner, data); 1144 case NVMM_IOC_GPA_UNMAP: 1145 return nvmm_gpa_unmap(owner, data); 1146 case NVMM_IOC_HVA_MAP: 1147 return nvmm_hva_map(owner, data); 1148 case NVMM_IOC_HVA_UNMAP: 1149 return nvmm_hva_unmap(owner, data); 1150 case NVMM_IOC_CTL: 1151 return nvmm_ctl(owner, data); 1152 default: 1153 return EINVAL; 1154 } 1155 } 1156 1157 /* -------------------------------------------------------------------------- */ 1158 1159 void 1160 nvmmattach(int nunits) 1161 { 1162 /* nothing */ 1163 } 1164 1165 MODULE(MODULE_CLASS_MISC, nvmm, NULL); 1166 1167 static int 1168 nvmm_modcmd(modcmd_t cmd, void *arg) 1169 { 1170 int error; 1171 1172 switch (cmd) { 1173 case MODULE_CMD_INIT: 1174 error = nvmm_init(); 1175 if (error) 1176 return error; 1177 1178 #if defined(_MODULE) 1179 { 1180 devmajor_t bmajor = NODEVMAJOR; 1181 devmajor_t cmajor = 345; 1182 1183 /* mknod /dev/nvmm c 345 0 */ 1184 error = devsw_attach("nvmm", NULL, &bmajor, 1185 &nvmm_cdevsw, &cmajor); 1186 if (error) { 1187 nvmm_fini(); 1188 return error; 1189 } 1190 } 1191 #endif 1192 return 0; 1193 1194 case MODULE_CMD_FINI: 1195 if (nmachines > 0) { 1196 return EBUSY; 1197 } 1198 #if defined(_MODULE) 1199 { 1200 error = devsw_detach(NULL, &nvmm_cdevsw); 1201 if (error) { 1202 return error; 1203 } 1204 } 1205 #endif 1206 nvmm_fini(); 1207 return 0; 1208 1209 case MODULE_CMD_AUTOUNLOAD: 1210 return EBUSY; 1211 1212 default: 1213 return ENOTTY; 1214 } 1215 } 1216
Indexes created Mon Sep 29 21:09:56 GMT 2025