1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2016 Flavius Anton 5 * Copyright (c) 2016 Mihai Tiganus 6 * Copyright (c) 2016-2019 Mihai Carabas 7 * Copyright (c) 2017-2019 Darius Mihai 8 * Copyright (c) 2017-2019 Elena Mihailescu 9 * Copyright (c) 2018-2019 Sergiu Weisz 10 * All rights reserved. 11 * The bhyve-snapshot feature was developed under sponsorships 12 * from Matthew Grooms. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 23 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include <sys/types.h> 40 #ifndef WITHOUT_CAPSICUM 41 #include <sys/capsicum.h> 42 #endif 43 #include <sys/mman.h> 44 #include <sys/socket.h> 45 #include <sys/stat.h> 46 #include <sys/time.h> 47 #include <sys/un.h> 48 49 #include <machine/atomic.h> 50 #include <machine/segments.h> 51 52 #ifndef WITHOUT_CAPSICUM 53 #include <capsicum_helpers.h> 54 #endif 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <err.h> 59 #include <errno.h> 60 #include <fcntl.h> 61 #include <libgen.h> 62 #include <signal.h> 63 #include <unistd.h> 64 #include <assert.h> 65 #include <errno.h> 66 #include <pthread.h> 67 #include <pthread_np.h> 68 #include <sysexits.h> 69 #include <stdbool.h> 70 #include <sys/ioctl.h> 71 72 #include <machine/vmm.h> 73 #ifndef WITHOUT_CAPSICUM 74 #include <machine/vmm_dev.h> 75 #endif 76 #include <machine/vmm_snapshot.h> 77 #include <vmmapi.h> 78 79 #include "bhyverun.h" 80 #include "acpi.h" 81 #include "atkbdc.h" 82 #include "debug.h" 83 #include "inout.h" 84 #include "ipc.h" 85 #include "fwctl.h" 86 #include "ioapic.h" 87 #include "mem.h" 88 #include "mevent.h" 89 #include "mptbl.h" 90 #include "pci_emul.h" 91 #include "pci_irq.h" 92 #include "pci_lpc.h" 93 #include "smbiostbl.h" 94 #include "snapshot.h" 95 #include "xmsr.h" 96 #include "spinup_ap.h" 97 #include "rtc.h" 98 99 #include <libxo/xo.h> 100 #include <ucl.h> 101 102 struct spinner_info { 103 const size_t *crtval; 104 const size_t maxval; 105 const size_t total; 106 }; 107 108 extern int guest_ncpus; 109 110 static struct winsize winsize; 111 static sig_t old_winch_handler; 112 113 #define KB (1024UL) 114 #define MB (1024UL * KB) 115 #define GB (1024UL * MB) 116 117 #define SNAPSHOT_CHUNK (4 * MB) 118 #define PROG_BUF_SZ (8192) 119 120 #define SNAPSHOT_BUFFER_SIZE (20 * MB) 121 122 #define JSON_STRUCT_ARR_KEY "structs" 123 #define JSON_DEV_ARR_KEY "devices" 124 #define JSON_BASIC_METADATA_KEY "basic metadata" 125 #define JSON_SNAPSHOT_REQ_KEY "snapshot_req" 126 #define JSON_SIZE_KEY "size" 127 #define JSON_FILE_OFFSET_KEY "file_offset" 128 129 #define JSON_NCPUS_KEY "ncpus" 130 #define JSON_VMNAME_KEY "vmname" 131 #define JSON_MEMSIZE_KEY "memsize" 132 #define JSON_MEMFLAGS_KEY "memflags" 133 134 #define min(a,b) \ 135 ({ \ 136 __typeof__ (a) _a = (a); \ 137 __typeof__ (b) _b = (b); \ 138 _a < _b ? _a : _b; \ 139 }) 140 141 static const struct vm_snapshot_dev_info snapshot_devs[] = { 142 { "atkbdc", atkbdc_snapshot, NULL, NULL }, 143 { "virtio-net", pci_snapshot, pci_pause, pci_resume }, 144 { "virtio-blk", pci_snapshot, pci_pause, pci_resume }, 145 { "virtio-rnd", pci_snapshot, NULL, NULL }, 146 { "lpc", pci_snapshot, NULL, NULL }, 147 { "fbuf", pci_snapshot, NULL, NULL }, 148 { "xhci", pci_snapshot, NULL, NULL }, 149 { "e1000", pci_snapshot, NULL, NULL }, 150 { "ahci", pci_snapshot, pci_pause, pci_resume }, 151 { "ahci-hd", pci_snapshot, pci_pause, pci_resume }, 152 { "ahci-cd", pci_snapshot, pci_pause, pci_resume }, 153 }; 154 155 static const struct vm_snapshot_kern_info snapshot_kern_structs[] = { 156 { "vhpet", STRUCT_VHPET }, 157 { "vm", STRUCT_VM }, 158 { "vioapic", STRUCT_VIOAPIC }, 159 { "vlapic", STRUCT_VLAPIC }, 160 { "vmcx", STRUCT_VMCX }, 161 { "vatpit", STRUCT_VATPIT }, 162 { "vatpic", STRUCT_VATPIC }, 163 { "vpmtmr", STRUCT_VPMTMR }, 164 { "vrtc", STRUCT_VRTC }, 165 }; 166 167 static cpuset_t vcpus_active, vcpus_suspended; 168 static pthread_mutex_t vcpu_lock; 169 static pthread_cond_t vcpus_idle, vcpus_can_run; 170 static bool checkpoint_active; 171 172 /* 173 * TODO: Harden this function and all of its callers since 'base_str' is a user 174 * provided string. 175 */ 176 static char * 177 strcat_extension(const char *base_str, const char *ext) 178 { 179 char *res; 180 size_t base_len, ext_len; 181 182 base_len = strnlen(base_str, NAME_MAX); 183 ext_len = strnlen(ext, NAME_MAX); 184 185 if (base_len + ext_len > NAME_MAX) { 186 fprintf(stderr, "Filename exceeds maximum length.\n"); 187 return (NULL); 188 } 189 190 res = malloc(base_len + ext_len + 1); 191 if (res == NULL) { 192 perror("Failed to allocate memory."); 193 return (NULL); 194 } 195 196 memcpy(res, base_str, base_len); 197 memcpy(res + base_len, ext, ext_len); 198 res[base_len + ext_len] = 0; 199 200 return (res); 201 } 202 203 void 204 destroy_restore_state(struct restore_state *rstate) 205 { 206 if (rstate == NULL) { 207 fprintf(stderr, "Attempting to destroy NULL restore struct.\n"); 208 return; 209 } 210 211 if (rstate->kdata_map != MAP_FAILED) 212 munmap(rstate->kdata_map, rstate->kdata_len); 213 214 if (rstate->kdata_fd > 0) 215 close(rstate->kdata_fd); 216 if (rstate->vmmem_fd > 0) 217 close(rstate->vmmem_fd); 218 219 if (rstate->meta_root_obj != NULL) 220 ucl_object_unref(rstate->meta_root_obj); 221 if (rstate->meta_parser != NULL) 222 ucl_parser_free(rstate->meta_parser); 223 } 224 225 static int 226 load_vmmem_file(const char *filename, struct restore_state *rstate) 227 { 228 struct stat sb; 229 int err; 230 231 rstate->vmmem_fd = open(filename, O_RDONLY); 232 if (rstate->vmmem_fd < 0) { 233 perror("Failed to open restore file"); 234 return (-1); 235 } 236 237 err = fstat(rstate->vmmem_fd, &sb); 238 if (err < 0) { 239 perror("Failed to stat restore file"); 240 goto err_load_vmmem; 241 } 242 243 if (sb.st_size == 0) { 244 fprintf(stderr, "Restore file is empty.\n"); 245 goto err_load_vmmem; 246 } 247 248 rstate->vmmem_len = sb.st_size; 249 250 return (0); 251 252 err_load_vmmem: 253 if (rstate->vmmem_fd > 0) 254 close(rstate->vmmem_fd); 255 return (-1); 256 } 257 258 static int 259 load_kdata_file(const char *filename, struct restore_state *rstate) 260 { 261 struct stat sb; 262 int err; 263 264 rstate->kdata_fd = open(filename, O_RDONLY); 265 if (rstate->kdata_fd < 0) { 266 perror("Failed to open kernel data file"); 267 return (-1); 268 } 269 270 err = fstat(rstate->kdata_fd, &sb); 271 if (err < 0) { 272 perror("Failed to stat kernel data file"); 273 goto err_load_kdata; 274 } 275 276 if (sb.st_size == 0) { 277 fprintf(stderr, "Kernel data file is empty.\n"); 278 goto err_load_kdata; 279 } 280 281 rstate->kdata_len = sb.st_size; 282 rstate->kdata_map = mmap(NULL, rstate->kdata_len, PROT_READ, 283 MAP_SHARED, rstate->kdata_fd, 0); 284 if (rstate->kdata_map == MAP_FAILED) { 285 perror("Failed to map restore file"); 286 goto err_load_kdata; 287 } 288 289 return (0); 290 291 err_load_kdata: 292 if (rstate->kdata_fd > 0) 293 close(rstate->kdata_fd); 294 return (-1); 295 } 296 297 static int 298 load_metadata_file(const char *filename, struct restore_state *rstate) 299 { 300 ucl_object_t *obj; 301 struct ucl_parser *parser; 302 int err; 303 304 parser = ucl_parser_new(UCL_PARSER_DEFAULT); 305 if (parser == NULL) { 306 fprintf(stderr, "Failed to initialize UCL parser.\n"); 307 err = -1; 308 goto err_load_metadata; 309 } 310 311 err = ucl_parser_add_file(parser, filename); 312 if (err == 0) { 313 fprintf(stderr, "Failed to parse metadata file: '%s'\n", 314 filename); 315 err = -1; 316 goto err_load_metadata; 317 } 318 319 obj = ucl_parser_get_object(parser); 320 if (obj == NULL) { 321 fprintf(stderr, "Failed to parse object.\n"); 322 err = -1; 323 goto err_load_metadata; 324 } 325 326 rstate->meta_parser = parser; 327 rstate->meta_root_obj = (ucl_object_t *)obj; 328 329 return (0); 330 331 err_load_metadata: 332 if (parser != NULL) 333 ucl_parser_free(parser); 334 return (err); 335 } 336 337 int 338 load_restore_file(const char *filename, struct restore_state *rstate) 339 { 340 int err = 0; 341 char *kdata_filename = NULL, *meta_filename = NULL; 342 343 assert(filename != NULL); 344 assert(rstate != NULL); 345 346 memset(rstate, 0, sizeof(*rstate)); 347 rstate->kdata_map = MAP_FAILED; 348 349 err = load_vmmem_file(filename, rstate); 350 if (err != 0) { 351 fprintf(stderr, "Failed to load guest RAM file.\n"); 352 goto err_restore; 353 } 354 355 kdata_filename = strcat_extension(filename, ".kern"); 356 if (kdata_filename == NULL) { 357 fprintf(stderr, "Failed to construct kernel data filename.\n"); 358 goto err_restore; 359 } 360 361 err = load_kdata_file(kdata_filename, rstate); 362 if (err != 0) { 363 fprintf(stderr, "Failed to load guest kernel data file.\n"); 364 goto err_restore; 365 } 366 367 meta_filename = strcat_extension(filename, ".meta"); 368 if (meta_filename == NULL) { 369 fprintf(stderr, "Failed to construct kernel metadata filename.\n"); 370 goto err_restore; 371 } 372 373 err = load_metadata_file(meta_filename, rstate); 374 if (err != 0) { 375 fprintf(stderr, "Failed to load guest metadata file.\n"); 376 goto err_restore; 377 } 378 379 return (0); 380 381 err_restore: 382 destroy_restore_state(rstate); 383 if (kdata_filename != NULL) 384 free(kdata_filename); 385 if (meta_filename != NULL) 386 free(meta_filename); 387 return (-1); 388 } 389 390 #define JSON_GET_INT_OR_RETURN(key, obj, result_ptr, ret) \ 391 do { \ 392 const ucl_object_t *obj__; \ 393 obj__ = ucl_object_lookup(obj, key); \ 394 if (obj__ == NULL) { \ 395 fprintf(stderr, "Missing key: '%s'", key); \ 396 return (ret); \ 397 } \ 398 if (!ucl_object_toint_safe(obj__, result_ptr)) { \ 399 fprintf(stderr, "Cannot convert '%s' value to int.", key); \ 400 return (ret); \ 401 } \ 402 } while(0) 403 404 #define JSON_GET_STRING_OR_RETURN(key, obj, result_ptr, ret) \ 405 do { \ 406 const ucl_object_t *obj__; \ 407 obj__ = ucl_object_lookup(obj, key); \ 408 if (obj__ == NULL) { \ 409 fprintf(stderr, "Missing key: '%s'", key); \ 410 return (ret); \ 411 } \ 412 if (!ucl_object_tostring_safe(obj__, result_ptr)) { \ 413 fprintf(stderr, "Cannot convert '%s' value to string.", key); \ 414 return (ret); \ 415 } \ 416 } while(0) 417 418 static void * 419 lookup_struct(enum snapshot_req struct_id, struct restore_state *rstate, 420 size_t *struct_size) 421 { 422 const ucl_object_t *structs = NULL, *obj = NULL; 423 ucl_object_iter_t it = NULL; 424 int64_t snapshot_req, size, file_offset; 425 426 structs = ucl_object_lookup(rstate->meta_root_obj, JSON_STRUCT_ARR_KEY); 427 if (structs == NULL) { 428 fprintf(stderr, "Failed to find '%s' object.\n", 429 JSON_STRUCT_ARR_KEY); 430 return (NULL); 431 } 432 433 if (ucl_object_type(structs) != UCL_ARRAY) { 434 fprintf(stderr, "Object '%s' is not an array.\n", 435 JSON_STRUCT_ARR_KEY); 436 return (NULL); 437 } 438 439 while ((obj = ucl_object_iterate(structs, &it, true)) != NULL) { 440 snapshot_req = -1; 441 JSON_GET_INT_OR_RETURN(JSON_SNAPSHOT_REQ_KEY, obj, 442 &snapshot_req, NULL); 443 assert(snapshot_req >= 0); 444 if ((enum snapshot_req) snapshot_req == struct_id) { 445 JSON_GET_INT_OR_RETURN(JSON_SIZE_KEY, obj, 446 &size, NULL); 447 assert(size >= 0); 448 449 JSON_GET_INT_OR_RETURN(JSON_FILE_OFFSET_KEY, obj, 450 &file_offset, NULL); 451 assert(file_offset >= 0); 452 assert((uint64_t)file_offset + size <= 453 rstate->kdata_len); 454 455 *struct_size = (size_t)size; 456 return ((uint8_t *)rstate->kdata_map + file_offset); 457 } 458 } 459 460 return (NULL); 461 } 462 463 static void * 464 lookup_check_dev(const char *dev_name, struct restore_state *rstate, 465 const ucl_object_t *obj, size_t *data_size) 466 { 467 const char *snapshot_req; 468 int64_t size, file_offset; 469 470 snapshot_req = NULL; 471 JSON_GET_STRING_OR_RETURN(JSON_SNAPSHOT_REQ_KEY, obj, 472 &snapshot_req, NULL); 473 assert(snapshot_req != NULL); 474 if (!strcmp(snapshot_req, dev_name)) { 475 JSON_GET_INT_OR_RETURN(JSON_SIZE_KEY, obj, 476 &size, NULL); 477 assert(size >= 0); 478 479 JSON_GET_INT_OR_RETURN(JSON_FILE_OFFSET_KEY, obj, 480 &file_offset, NULL); 481 assert(file_offset >= 0); 482 assert((uint64_t)file_offset + size <= rstate->kdata_len); 483 484 *data_size = (size_t)size; 485 return ((uint8_t *)rstate->kdata_map + file_offset); 486 } 487 488 return (NULL); 489 } 490 491 static void* 492 lookup_dev(const char *dev_name, struct restore_state *rstate, 493 size_t *data_size) 494 { 495 const ucl_object_t *devs = NULL, *obj = NULL; 496 ucl_object_iter_t it = NULL; 497 void *ret; 498 499 devs = ucl_object_lookup(rstate->meta_root_obj, JSON_DEV_ARR_KEY); 500 if (devs == NULL) { 501 fprintf(stderr, "Failed to find '%s' object.\n", 502 JSON_DEV_ARR_KEY); 503 return (NULL); 504 } 505 506 if (ucl_object_type(devs) != UCL_ARRAY) { 507 fprintf(stderr, "Object '%s' is not an array.\n", 508 JSON_DEV_ARR_KEY); 509 return (NULL); 510 } 511 512 while ((obj = ucl_object_iterate(devs, &it, true)) != NULL) { 513 ret = lookup_check_dev(dev_name, rstate, obj, data_size); 514 if (ret != NULL) 515 return (ret); 516 } 517 518 return (NULL); 519 } 520 521 static const ucl_object_t * 522 lookup_basic_metadata_object(struct restore_state *rstate) 523 { 524 const ucl_object_t *basic_meta_obj = NULL; 525 526 basic_meta_obj = ucl_object_lookup(rstate->meta_root_obj, 527 JSON_BASIC_METADATA_KEY); 528 if (basic_meta_obj == NULL) { 529 fprintf(stderr, "Failed to find '%s' object.\n", 530 JSON_BASIC_METADATA_KEY); 531 return (NULL); 532 } 533 534 if (ucl_object_type(basic_meta_obj) != UCL_OBJECT) { 535 fprintf(stderr, "Object '%s' is not a JSON object.\n", 536 JSON_BASIC_METADATA_KEY); 537 return (NULL); 538 } 539 540 return (basic_meta_obj); 541 } 542 543 const char * 544 lookup_vmname(struct restore_state *rstate) 545 { 546 const char *vmname; 547 const ucl_object_t *obj; 548 549 obj = lookup_basic_metadata_object(rstate); 550 if (obj == NULL) 551 return (NULL); 552 553 JSON_GET_STRING_OR_RETURN(JSON_VMNAME_KEY, obj, &vmname, NULL); 554 return (vmname); 555 } 556 557 int 558 lookup_memflags(struct restore_state *rstate) 559 { 560 int64_t memflags; 561 const ucl_object_t *obj; 562 563 obj = lookup_basic_metadata_object(rstate); 564 if (obj == NULL) 565 return (0); 566 567 JSON_GET_INT_OR_RETURN(JSON_MEMFLAGS_KEY, obj, &memflags, 0); 568 569 return ((int)memflags); 570 } 571 572 size_t 573 lookup_memsize(struct restore_state *rstate) 574 { 575 int64_t memsize; 576 const ucl_object_t *obj; 577 578 obj = lookup_basic_metadata_object(rstate); 579 if (obj == NULL) 580 return (0); 581 582 JSON_GET_INT_OR_RETURN(JSON_MEMSIZE_KEY, obj, &memsize, 0); 583 if (memsize < 0) 584 memsize = 0; 585 586 return ((size_t)memsize); 587 } 588 589 590 int 591 lookup_guest_ncpus(struct restore_state *rstate) 592 { 593 int64_t ncpus; 594 const ucl_object_t *obj; 595 596 obj = lookup_basic_metadata_object(rstate); 597 if (obj == NULL) 598 return (0); 599 600 JSON_GET_INT_OR_RETURN(JSON_NCPUS_KEY, obj, &ncpus, 0); 601 return ((int)ncpus); 602 } 603 604 static void 605 winch_handler(int signal __unused) 606 { 607 #ifdef TIOCGWINSZ 608 ioctl(STDOUT_FILENO, TIOCGWINSZ, &winsize); 609 #endif /* TIOCGWINSZ */ 610 } 611 612 static int 613 print_progress(size_t crtval, const size_t maxval) 614 { 615 size_t rc; 616 double crtval_gb, maxval_gb; 617 size_t i, win_width, prog_start, prog_done, prog_end; 618 int mval_len; 619 620 static char prog_buf[PROG_BUF_SZ]; 621 static const size_t len = sizeof(prog_buf); 622 623 static size_t div; 624 static const char *div_str; 625 626 static char wip_bar[] = { '/', '-', '\\', '|' }; 627 static int wip_idx = 0; 628 629 if (maxval == 0) { 630 printf("[0B / 0B]\r\n"); 631 return (0); 632 } 633 634 if (crtval > maxval) 635 crtval = maxval; 636 637 if (maxval > 10 * GB) { 638 div = GB; 639 div_str = "GiB"; 640 } else if (maxval > 10 * MB) { 641 div = MB; 642 div_str = "MiB"; 643 } else { 644 div = KB; 645 div_str = "KiB"; 646 } 647 648 crtval_gb = (double) crtval / div; 649 maxval_gb = (double) maxval / div; 650 651 rc = snprintf(prog_buf, len, "%.03lf", maxval_gb); 652 if (rc == len) { 653 fprintf(stderr, "Maxval too big\n"); 654 return (-1); 655 } 656 mval_len = rc; 657 658 rc = snprintf(prog_buf, len, "\r[%*.03lf%s / %.03lf%s] |", 659 mval_len, crtval_gb, div_str, maxval_gb, div_str); 660 661 if (rc == len) { 662 fprintf(stderr, "Buffer too small to print progress\n"); 663 return (-1); 664 } 665 666 win_width = min(winsize.ws_col, len); 667 prog_start = rc; 668 669 if (prog_start < (win_width - 2)) { 670 prog_end = win_width - prog_start - 2; 671 prog_done = prog_end * (crtval_gb / maxval_gb); 672 673 for (i = prog_start; i < prog_start + prog_done; i++) 674 prog_buf[i] = '#'; 675 676 if (crtval != maxval) { 677 prog_buf[i] = wip_bar[wip_idx]; 678 wip_idx = (wip_idx + 1) % sizeof(wip_bar); 679 i++; 680 } else { 681 prog_buf[i++] = '#'; 682 } 683 684 for (; i < win_width - 2; i++) 685 prog_buf[i] = '_'; 686 687 prog_buf[win_width - 2] = '|'; 688 } 689 690 prog_buf[win_width - 1] = '\0'; 691 write(STDOUT_FILENO, prog_buf, win_width); 692 693 return (0); 694 } 695 696 static void * 697 snapshot_spinner_cb(void *arg) 698 { 699 int rc; 700 size_t crtval, maxval, total; 701 struct spinner_info *si; 702 struct timespec ts; 703 704 si = arg; 705 if (si == NULL) 706 pthread_exit(NULL); 707 708 ts.tv_sec = 0; 709 ts.tv_nsec = 50 * 1000 * 1000; /* 50 ms sleep time */ 710 711 do { 712 crtval = *si->crtval; 713 maxval = si->maxval; 714 total = si->total; 715 716 rc = print_progress(crtval, total); 717 if (rc < 0) { 718 fprintf(stderr, "Failed to parse progress\n"); 719 break; 720 } 721 722 nanosleep(&ts, NULL); 723 } while (crtval < maxval); 724 725 pthread_exit(NULL); 726 return NULL; 727 } 728 729 static int 730 vm_snapshot_mem_part(const int snapfd, const size_t foff, void *src, 731 const size_t len, const size_t totalmem, const bool op_wr) 732 { 733 int rc; 734 size_t part_done, todo, rem; 735 ssize_t done; 736 bool show_progress; 737 pthread_t spinner_th; 738 struct spinner_info *si; 739 740 if (lseek(snapfd, foff, SEEK_SET) < 0) { 741 perror("Failed to change file offset"); 742 return (-1); 743 } 744 745 show_progress = false; 746 if (isatty(STDIN_FILENO) && (winsize.ws_col != 0)) 747 show_progress = true; 748 749 part_done = foff; 750 rem = len; 751 752 if (show_progress) { 753 si = &(struct spinner_info) { 754 .crtval = &part_done, 755 .maxval = foff + len, 756 .total = totalmem 757 }; 758 759 rc = pthread_create(&spinner_th, 0, snapshot_spinner_cb, si); 760 if (rc) { 761 perror("Unable to create spinner thread"); 762 show_progress = false; 763 } 764 } 765 766 while (rem > 0) { 767 if (show_progress) 768 todo = min(SNAPSHOT_CHUNK, rem); 769 else 770 todo = rem; 771 772 if (op_wr) 773 done = write(snapfd, src, todo); 774 else 775 done = read(snapfd, src, todo); 776 if (done < 0) { 777 perror("Failed to write in file"); 778 return (-1); 779 } 780 781 src = (uint8_t *)src + done; 782 part_done += done; 783 rem -= done; 784 } 785 786 if (show_progress) { 787 rc = pthread_join(spinner_th, NULL); 788 if (rc) 789 perror("Unable to end spinner thread"); 790 } 791 792 return (0); 793 } 794 795 static size_t 796 vm_snapshot_mem(struct vmctx *ctx, int snapfd, size_t memsz, const bool op_wr) 797 { 798 int ret; 799 size_t lowmem, highmem, totalmem; 800 char *baseaddr; 801 802 ret = vm_get_guestmem_from_ctx(ctx, &baseaddr, &lowmem, &highmem); 803 if (ret) { 804 fprintf(stderr, "%s: unable to retrieve guest memory size\r\n", 805 __func__); 806 return (0); 807 } 808 totalmem = lowmem + highmem; 809 810 if ((op_wr == false) && (totalmem != memsz)) { 811 fprintf(stderr, "%s: mem size mismatch: %ld vs %ld\r\n", 812 __func__, totalmem, memsz); 813 return (0); 814 } 815 816 winsize.ws_col = 80; 817 #ifdef TIOCGWINSZ 818 ioctl(STDOUT_FILENO, TIOCGWINSZ, &winsize); 819 #endif /* TIOCGWINSZ */ 820 old_winch_handler = signal(SIGWINCH, winch_handler); 821 822 ret = vm_snapshot_mem_part(snapfd, 0, baseaddr, lowmem, 823 totalmem, op_wr); 824 if (ret) { 825 fprintf(stderr, "%s: Could not %s lowmem\r\n", 826 __func__, op_wr ? "write" : "read"); 827 totalmem = 0; 828 goto done; 829 } 830 831 if (highmem == 0) 832 goto done; 833 834 ret = vm_snapshot_mem_part(snapfd, lowmem, baseaddr + 4*GB, 835 highmem, totalmem, op_wr); 836 if (ret) { 837 fprintf(stderr, "%s: Could not %s highmem\r\n", 838 __func__, op_wr ? "write" : "read"); 839 totalmem = 0; 840 goto done; 841 } 842 843 done: 844 printf("\r\n"); 845 signal(SIGWINCH, old_winch_handler); 846 847 return (totalmem); 848 } 849 850 int 851 restore_vm_mem(struct vmctx *ctx, struct restore_state *rstate) 852 { 853 size_t restored; 854 855 restored = vm_snapshot_mem(ctx, rstate->vmmem_fd, rstate->vmmem_len, 856 false); 857 858 if (restored != rstate->vmmem_len) 859 return (-1); 860 861 return (0); 862 } 863 864 static int 865 vm_restore_kern_struct(struct vmctx *ctx, struct restore_state *rstate, 866 const struct vm_snapshot_kern_info *info) 867 { 868 void *struct_ptr; 869 size_t struct_size; 870 int ret; 871 struct vm_snapshot_meta *meta; 872 873 struct_ptr = lookup_struct(info->req, rstate, &struct_size); 874 if (struct_ptr == NULL) { 875 fprintf(stderr, "%s: Failed to lookup struct %s\r\n", 876 __func__, info->struct_name); 877 ret = -1; 878 goto done; 879 } 880 881 if (struct_size == 0) { 882 fprintf(stderr, "%s: Kernel struct size was 0 for: %s\r\n", 883 __func__, info->struct_name); 884 ret = -1; 885 goto done; 886 } 887 888 meta = &(struct vm_snapshot_meta) { 889 .dev_name = info->struct_name, 890 .dev_req = info->req, 891 892 .buffer.buf_start = struct_ptr, 893 .buffer.buf_size = struct_size, 894 895 .buffer.buf = struct_ptr, 896 .buffer.buf_rem = struct_size, 897 898 .op = VM_SNAPSHOT_RESTORE, 899 }; 900 901 ret = vm_snapshot_req(ctx, meta); 902 if (ret != 0) { 903 fprintf(stderr, "%s: Failed to restore struct: %s\r\n", 904 __func__, info->struct_name); 905 goto done; 906 } 907 908 done: 909 return (ret); 910 } 911 912 int 913 vm_restore_kern_structs(struct vmctx *ctx, struct restore_state *rstate) 914 { 915 size_t i; 916 int ret; 917 918 for (i = 0; i < nitems(snapshot_kern_structs); i++) { 919 ret = vm_restore_kern_struct(ctx, rstate, 920 &snapshot_kern_structs[i]); 921 if (ret != 0) 922 return (ret); 923 } 924 925 return (0); 926 } 927 928 static int 929 vm_restore_user_dev(struct restore_state *rstate, 930 const struct vm_snapshot_dev_info *info) 931 { 932 void *dev_ptr; 933 size_t dev_size; 934 int ret; 935 struct vm_snapshot_meta *meta; 936 937 dev_ptr = lookup_dev(info->dev_name, rstate, &dev_size); 938 if (dev_ptr == NULL) { 939 fprintf(stderr, "Failed to lookup dev: %s\r\n", info->dev_name); 940 fprintf(stderr, "Continuing the restore/migration process\r\n"); 941 return (0); 942 } 943 944 if (dev_size == 0) { 945 fprintf(stderr, "%s: Device size is 0. " 946 "Assuming %s is not used\r\n", 947 __func__, info->dev_name); 948 return (0); 949 } 950 951 meta = &(struct vm_snapshot_meta) { 952 .dev_name = info->dev_name, 953 954 .buffer.buf_start = dev_ptr, 955 .buffer.buf_size = dev_size, 956 957 .buffer.buf = dev_ptr, 958 .buffer.buf_rem = dev_size, 959 960 .op = VM_SNAPSHOT_RESTORE, 961 }; 962 963 ret = (*info->snapshot_cb)(meta); 964 if (ret != 0) { 965 fprintf(stderr, "Failed to restore dev: %s\r\n", 966 info->dev_name); 967 return (-1); 968 } 969 970 return (0); 971 } 972 973 974 int 975 vm_restore_user_devs(struct restore_state *rstate) 976 { 977 size_t i; 978 int ret; 979 980 for (i = 0; i < nitems(snapshot_devs); i++) { 981 ret = vm_restore_user_dev(rstate, &snapshot_devs[i]); 982 if (ret != 0) 983 return (ret); 984 } 985 986 return 0; 987 } 988 989 int 990 vm_pause_user_devs(void) 991 { 992 const struct vm_snapshot_dev_info *info; 993 size_t i; 994 int ret; 995 996 for (i = 0; i < nitems(snapshot_devs); i++) { 997 info = &snapshot_devs[i]; 998 if (info->pause_cb == NULL) 999 continue; 1000 1001 ret = info->pause_cb(info->dev_name); 1002 if (ret != 0) 1003 return (ret); 1004 } 1005 1006 return (0); 1007 } 1008 1009 int 1010 vm_resume_user_devs(void) 1011 { 1012 const struct vm_snapshot_dev_info *info; 1013 size_t i; 1014 int ret; 1015 1016 for (i = 0; i < nitems(snapshot_devs); i++) { 1017 info = &snapshot_devs[i]; 1018 if (info->resume_cb == NULL) 1019 continue; 1020 1021 ret = info->resume_cb(info->dev_name); 1022 if (ret != 0) 1023 return (ret); 1024 } 1025 1026 return (0); 1027 } 1028 1029 static int 1030 vm_snapshot_kern_struct(struct vmctx *ctx, int data_fd, xo_handle_t *xop, 1031 const char *array_key, struct vm_snapshot_meta *meta, off_t *offset) 1032 { 1033 int ret; 1034 size_t data_size; 1035 ssize_t write_cnt; 1036 1037 ret = vm_snapshot_req(ctx, meta); 1038 if (ret != 0) { 1039 fprintf(stderr, "%s: Failed to snapshot struct %s\r\n", 1040 __func__, meta->dev_name); 1041 ret = -1; 1042 goto done; 1043 } 1044 1045 data_size = vm_get_snapshot_size(meta); 1046 1047 /* XXX-MJ no handling for short writes. */ 1048 write_cnt = write(data_fd, meta->buffer.buf_start, data_size); 1049 if (write_cnt < 0 || (size_t)write_cnt != data_size) { 1050 perror("Failed to write all snapshotted data."); 1051 ret = -1; 1052 goto done; 1053 } 1054 1055 /* Write metadata. */ 1056 xo_open_instance_h(xop, array_key); 1057 xo_emit_h(xop, "{:debug_name/%s}\n", meta->dev_name); 1058 xo_emit_h(xop, "{:" JSON_SNAPSHOT_REQ_KEY "/%d}\n", 1059 meta->dev_req); 1060 xo_emit_h(xop, "{:" JSON_SIZE_KEY "/%lu}\n", data_size); 1061 xo_emit_h(xop, "{:" JSON_FILE_OFFSET_KEY "/%lu}\n", *offset); 1062 xo_close_instance_h(xop, JSON_STRUCT_ARR_KEY); 1063 1064 *offset += data_size; 1065 1066 done: 1067 return (ret); 1068 } 1069 1070 static int 1071 vm_snapshot_kern_structs(struct vmctx *ctx, int data_fd, xo_handle_t *xop) 1072 { 1073 int ret, error; 1074 size_t buf_size, i, offset; 1075 char *buffer; 1076 struct vm_snapshot_meta *meta; 1077 1078 error = 0; 1079 offset = 0; 1080 buf_size = SNAPSHOT_BUFFER_SIZE; 1081 1082 buffer = malloc(SNAPSHOT_BUFFER_SIZE * sizeof(char)); 1083 if (buffer == NULL) { 1084 error = ENOMEM; 1085 perror("Failed to allocate memory for snapshot buffer"); 1086 goto err_vm_snapshot_kern_data; 1087 } 1088 1089 meta = &(struct vm_snapshot_meta) { 1090 .buffer.buf_start = buffer, 1091 .buffer.buf_size = buf_size, 1092 1093 .op = VM_SNAPSHOT_SAVE, 1094 }; 1095 1096 xo_open_list_h(xop, JSON_STRUCT_ARR_KEY); 1097 for (i = 0; i < nitems(snapshot_kern_structs); i++) { 1098 meta->dev_name = snapshot_kern_structs[i].struct_name; 1099 meta->dev_req = snapshot_kern_structs[i].req; 1100 1101 memset(meta->buffer.buf_start, 0, meta->buffer.buf_size); 1102 meta->buffer.buf = meta->buffer.buf_start; 1103 meta->buffer.buf_rem = meta->buffer.buf_size; 1104 1105 ret = vm_snapshot_kern_struct(ctx, data_fd, xop, 1106 JSON_DEV_ARR_KEY, meta, &offset); 1107 if (ret != 0) { 1108 error = -1; 1109 goto err_vm_snapshot_kern_data; 1110 } 1111 } 1112 xo_close_list_h(xop, JSON_STRUCT_ARR_KEY); 1113 1114 err_vm_snapshot_kern_data: 1115 if (buffer != NULL) 1116 free(buffer); 1117 return (error); 1118 } 1119 1120 static int 1121 vm_snapshot_basic_metadata(struct vmctx *ctx, xo_handle_t *xop, size_t memsz) 1122 { 1123 1124 xo_open_container_h(xop, JSON_BASIC_METADATA_KEY); 1125 xo_emit_h(xop, "{:" JSON_NCPUS_KEY "/%ld}\n", guest_ncpus); 1126 xo_emit_h(xop, "{:" JSON_VMNAME_KEY "/%s}\n", vm_get_name(ctx)); 1127 xo_emit_h(xop, "{:" JSON_MEMSIZE_KEY "/%lu}\n", memsz); 1128 xo_emit_h(xop, "{:" JSON_MEMFLAGS_KEY "/%d}\n", vm_get_memflags(ctx)); 1129 xo_close_container_h(xop, JSON_BASIC_METADATA_KEY); 1130 1131 return (0); 1132 } 1133 1134 static int 1135 vm_snapshot_dev_write_data(int data_fd, xo_handle_t *xop, const char *array_key, 1136 struct vm_snapshot_meta *meta, off_t *offset) 1137 { 1138 ssize_t ret; 1139 size_t data_size; 1140 1141 data_size = vm_get_snapshot_size(meta); 1142 1143 /* XXX-MJ no handling for short writes. */ 1144 ret = write(data_fd, meta->buffer.buf_start, data_size); 1145 if (ret < 0 || (size_t)ret != data_size) { 1146 perror("Failed to write all snapshotted data."); 1147 return (-1); 1148 } 1149 1150 /* Write metadata. */ 1151 xo_open_instance_h(xop, array_key); 1152 xo_emit_h(xop, "{:" JSON_SNAPSHOT_REQ_KEY "/%s}\n", meta->dev_name); 1153 xo_emit_h(xop, "{:" JSON_SIZE_KEY "/%lu}\n", data_size); 1154 xo_emit_h(xop, "{:" JSON_FILE_OFFSET_KEY "/%lu}\n", *offset); 1155 xo_close_instance_h(xop, array_key); 1156 1157 *offset += data_size; 1158 1159 return (0); 1160 } 1161 1162 static int 1163 vm_snapshot_user_dev(const struct vm_snapshot_dev_info *info, 1164 int data_fd, xo_handle_t *xop, 1165 struct vm_snapshot_meta *meta, off_t *offset) 1166 { 1167 int ret; 1168 1169 ret = (*info->snapshot_cb)(meta); 1170 if (ret != 0) { 1171 fprintf(stderr, "Failed to snapshot %s; ret=%d\r\n", 1172 meta->dev_name, ret); 1173 return (ret); 1174 } 1175 1176 ret = vm_snapshot_dev_write_data(data_fd, xop, JSON_DEV_ARR_KEY, meta, 1177 offset); 1178 if (ret != 0) 1179 return (ret); 1180 1181 return (0); 1182 } 1183 1184 static int 1185 vm_snapshot_user_devs(int data_fd, xo_handle_t *xop) 1186 { 1187 int ret; 1188 off_t offset; 1189 void *buffer; 1190 size_t buf_size, i; 1191 struct vm_snapshot_meta *meta; 1192 1193 buf_size = SNAPSHOT_BUFFER_SIZE; 1194 1195 offset = lseek(data_fd, 0, SEEK_CUR); 1196 if (offset < 0) { 1197 perror("Failed to get data file current offset."); 1198 return (-1); 1199 } 1200 1201 buffer = malloc(buf_size); 1202 if (buffer == NULL) { 1203 perror("Failed to allocate memory for snapshot buffer"); 1204 ret = ENOSPC; 1205 goto snapshot_err; 1206 } 1207 1208 meta = &(struct vm_snapshot_meta) { 1209 .buffer.buf_start = buffer, 1210 .buffer.buf_size = buf_size, 1211 1212 .op = VM_SNAPSHOT_SAVE, 1213 }; 1214 1215 xo_open_list_h(xop, JSON_DEV_ARR_KEY); 1216 1217 /* Restore other devices that support this feature */ 1218 for (i = 0; i < nitems(snapshot_devs); i++) { 1219 meta->dev_name = snapshot_devs[i].dev_name; 1220 1221 memset(meta->buffer.buf_start, 0, meta->buffer.buf_size); 1222 meta->buffer.buf = meta->buffer.buf_start; 1223 meta->buffer.buf_rem = meta->buffer.buf_size; 1224 1225 ret = vm_snapshot_user_dev(&snapshot_devs[i], data_fd, xop, 1226 meta, &offset); 1227 if (ret != 0) 1228 goto snapshot_err; 1229 } 1230 1231 xo_close_list_h(xop, JSON_DEV_ARR_KEY); 1232 1233 snapshot_err: 1234 if (buffer != NULL) 1235 free(buffer); 1236 return (ret); 1237 } 1238 1239 void 1240 checkpoint_cpu_add(int vcpu) 1241 { 1242 1243 pthread_mutex_lock(&vcpu_lock); 1244 CPU_SET(vcpu, &vcpus_active); 1245 1246 if (checkpoint_active) { 1247 CPU_SET(vcpu, &vcpus_suspended); 1248 while (checkpoint_active) 1249 pthread_cond_wait(&vcpus_can_run, &vcpu_lock); 1250 CPU_CLR(vcpu, &vcpus_suspended); 1251 } 1252 pthread_mutex_unlock(&vcpu_lock); 1253 } 1254 1255 /* 1256 * When a vCPU is suspended for any reason, it calls 1257 * checkpoint_cpu_suspend(). This records that the vCPU is idle. 1258 * Before returning from suspension, checkpoint_cpu_resume() is 1259 * called. In suspend we note that the vCPU is idle. In resume we 1260 * pause the vCPU thread until the checkpoint is complete. The reason 1261 * for the two-step process is that vCPUs might already be stopped in 1262 * the debug server when a checkpoint is requested. This approach 1263 * allows us to account for and handle those vCPUs. 1264 */ 1265 void 1266 checkpoint_cpu_suspend(int vcpu) 1267 { 1268 1269 pthread_mutex_lock(&vcpu_lock); 1270 CPU_SET(vcpu, &vcpus_suspended); 1271 if (checkpoint_active && CPU_CMP(&vcpus_active, &vcpus_suspended) == 0) 1272 pthread_cond_signal(&vcpus_idle); 1273 pthread_mutex_unlock(&vcpu_lock); 1274 } 1275 1276 void 1277 checkpoint_cpu_resume(int vcpu) 1278 { 1279 1280 pthread_mutex_lock(&vcpu_lock); 1281 while (checkpoint_active) 1282 pthread_cond_wait(&vcpus_can_run, &vcpu_lock); 1283 CPU_CLR(vcpu, &vcpus_suspended); 1284 pthread_mutex_unlock(&vcpu_lock); 1285 } 1286 1287 static void 1288 vm_vcpu_pause(struct vmctx *ctx) 1289 { 1290 1291 pthread_mutex_lock(&vcpu_lock); 1292 checkpoint_active = true; 1293 vm_suspend_all_cpus(ctx); 1294 while (CPU_CMP(&vcpus_active, &vcpus_suspended) != 0) 1295 pthread_cond_wait(&vcpus_idle, &vcpu_lock); 1296 pthread_mutex_unlock(&vcpu_lock); 1297 } 1298 1299 static void 1300 vm_vcpu_resume(struct vmctx *ctx) 1301 { 1302 1303 pthread_mutex_lock(&vcpu_lock); 1304 checkpoint_active = false; 1305 pthread_mutex_unlock(&vcpu_lock); 1306 vm_resume_all_cpus(ctx); 1307 pthread_cond_broadcast(&vcpus_can_run); 1308 } 1309 1310 static int 1311 vm_checkpoint(struct vmctx *ctx, const char *checkpoint_file, bool stop_vm) 1312 { 1313 int fd_checkpoint = 0, kdata_fd = 0; 1314 int ret = 0; 1315 int error = 0; 1316 size_t memsz; 1317 xo_handle_t *xop = NULL; 1318 char *meta_filename = NULL; 1319 char *kdata_filename = NULL; 1320 FILE *meta_file = NULL; 1321 1322 kdata_filename = strcat_extension(checkpoint_file, ".kern"); 1323 if (kdata_filename == NULL) { 1324 fprintf(stderr, "Failed to construct kernel data filename.\n"); 1325 return (-1); 1326 } 1327 1328 kdata_fd = open(kdata_filename, O_WRONLY | O_CREAT | O_TRUNC, 0700); 1329 if (kdata_fd < 0) { 1330 perror("Failed to open kernel data snapshot file."); 1331 error = -1; 1332 goto done; 1333 } 1334 1335 fd_checkpoint = open(checkpoint_file, O_RDWR | O_CREAT | O_TRUNC, 0700); 1336 1337 if (fd_checkpoint < 0) { 1338 perror("Failed to create checkpoint file"); 1339 error = -1; 1340 goto done; 1341 } 1342 1343 meta_filename = strcat_extension(checkpoint_file, ".meta"); 1344 if (meta_filename == NULL) { 1345 fprintf(stderr, "Failed to construct vm metadata filename.\n"); 1346 goto done; 1347 } 1348 1349 meta_file = fopen(meta_filename, "w"); 1350 if (meta_file == NULL) { 1351 perror("Failed to open vm metadata snapshot file."); 1352 goto done; 1353 } 1354 1355 xop = xo_create_to_file(meta_file, XO_STYLE_JSON, XOF_PRETTY); 1356 if (xop == NULL) { 1357 perror("Failed to get libxo handle on metadata file."); 1358 goto done; 1359 } 1360 1361 vm_vcpu_pause(ctx); 1362 1363 ret = vm_pause_user_devs(); 1364 if (ret != 0) { 1365 fprintf(stderr, "Could not pause devices\r\n"); 1366 error = ret; 1367 goto done; 1368 } 1369 1370 memsz = vm_snapshot_mem(ctx, fd_checkpoint, 0, true); 1371 if (memsz == 0) { 1372 perror("Could not write guest memory to file"); 1373 error = -1; 1374 goto done; 1375 } 1376 1377 ret = vm_snapshot_basic_metadata(ctx, xop, memsz); 1378 if (ret != 0) { 1379 fprintf(stderr, "Failed to snapshot vm basic metadata.\n"); 1380 error = -1; 1381 goto done; 1382 } 1383 1384 1385 ret = vm_snapshot_kern_structs(ctx, kdata_fd, xop); 1386 if (ret != 0) { 1387 fprintf(stderr, "Failed to snapshot vm kernel data.\n"); 1388 error = -1; 1389 goto done; 1390 } 1391 1392 ret = vm_snapshot_user_devs(kdata_fd, xop); 1393 if (ret != 0) { 1394 fprintf(stderr, "Failed to snapshot device state.\n"); 1395 error = -1; 1396 goto done; 1397 } 1398 1399 xo_finish_h(xop); 1400 1401 if (stop_vm) { 1402 vm_destroy(ctx); 1403 exit(0); 1404 } 1405 1406 done: 1407 ret = vm_resume_user_devs(); 1408 if (ret != 0) 1409 fprintf(stderr, "Could not resume devices\r\n"); 1410 vm_vcpu_resume(ctx); 1411 if (fd_checkpoint > 0) 1412 close(fd_checkpoint); 1413 if (meta_filename != NULL) 1414 free(meta_filename); 1415 if (kdata_filename != NULL) 1416 free(kdata_filename); 1417 if (xop != NULL) 1418 xo_destroy(xop); 1419 if (meta_file != NULL) 1420 fclose(meta_file); 1421 if (kdata_fd > 0) 1422 close(kdata_fd); 1423 return (error); 1424 } 1425 1426 static int 1427 handle_message(struct vmctx *ctx, nvlist_t *nvl) 1428 { 1429 const char *cmd; 1430 struct ipc_command **ipc_cmd; 1431 1432 if (!nvlist_exists_string(nvl, "cmd")) 1433 return (EINVAL); 1434 1435 cmd = nvlist_get_string(nvl, "cmd"); 1436 IPC_COMMAND_FOREACH(ipc_cmd, ipc_cmd_set) { 1437 if (strcmp(cmd, (*ipc_cmd)->name) == 0) 1438 return ((*ipc_cmd)->handler(ctx, nvl)); 1439 } 1440 1441 return (EOPNOTSUPP); 1442 } 1443 1444 /* 1445 * Listen for commands from bhyvectl 1446 */ 1447 void * 1448 checkpoint_thread(void *param) 1449 { 1450 int fd; 1451 struct checkpoint_thread_info *thread_info; 1452 nvlist_t *nvl; 1453 1454 pthread_set_name_np(pthread_self(), "checkpoint thread"); 1455 thread_info = (struct checkpoint_thread_info *)param; 1456 1457 while ((fd = accept(thread_info->socket_fd, NULL, NULL)) != -1) { 1458 nvl = nvlist_recv(fd, 0); 1459 if (nvl != NULL) 1460 handle_message(thread_info->ctx, nvl); 1461 else 1462 EPRINTLN("nvlist_recv() failed: %s", strerror(errno)); 1463 1464 close(fd); 1465 nvlist_destroy(nvl); 1466 } 1467 1468 return (NULL); 1469 } 1470 1471 static int 1472 vm_do_checkpoint(struct vmctx *ctx, const nvlist_t *nvl) 1473 { 1474 int error; 1475 1476 if (!nvlist_exists_string(nvl, "filename") || 1477 !nvlist_exists_bool(nvl, "suspend")) 1478 error = EINVAL; 1479 else 1480 error = vm_checkpoint(ctx, nvlist_get_string(nvl, "filename"), 1481 nvlist_get_bool(nvl, "suspend")); 1482 1483 return (error); 1484 } 1485 IPC_COMMAND(ipc_cmd_set, checkpoint, vm_do_checkpoint); 1486 1487 void 1488 init_snapshot(void) 1489 { 1490 int err; 1491 1492 err = pthread_mutex_init(&vcpu_lock, NULL); 1493 if (err != 0) 1494 errc(1, err, "checkpoint mutex init"); 1495 err = pthread_cond_init(&vcpus_idle, NULL); 1496 if (err != 0) 1497 errc(1, err, "checkpoint cv init (vcpus_idle)"); 1498 err = pthread_cond_init(&vcpus_can_run, NULL); 1499 if (err != 0) 1500 errc(1, err, "checkpoint cv init (vcpus_can_run)"); 1501 } 1502 1503 /* 1504 * Create the listening socket for IPC with bhyvectl 1505 */ 1506 int 1507 init_checkpoint_thread(struct vmctx *ctx) 1508 { 1509 struct checkpoint_thread_info *checkpoint_info = NULL; 1510 struct sockaddr_un addr; 1511 int socket_fd; 1512 pthread_t checkpoint_pthread; 1513 int err; 1514 #ifndef WITHOUT_CAPSICUM 1515 cap_rights_t rights; 1516 #endif 1517 1518 memset(&addr, 0, sizeof(addr)); 1519 1520 socket_fd = socket(PF_UNIX, SOCK_STREAM, 0); 1521 if (socket_fd < 0) { 1522 EPRINTLN("Socket creation failed: %s", strerror(errno)); 1523 err = -1; 1524 goto fail; 1525 } 1526 1527 addr.sun_family = AF_UNIX; 1528 1529 snprintf(addr.sun_path, sizeof(addr.sun_path), "%s%s", 1530 BHYVE_RUN_DIR, vm_get_name(ctx)); 1531 addr.sun_len = SUN_LEN(&addr); 1532 unlink(addr.sun_path); 1533 1534 if (bind(socket_fd, (struct sockaddr *)&addr, addr.sun_len) != 0) { 1535 EPRINTLN("Failed to bind socket \"%s\": %s\n", 1536 addr.sun_path, strerror(errno)); 1537 err = -1; 1538 goto fail; 1539 } 1540 1541 if (listen(socket_fd, 10) < 0) { 1542 EPRINTLN("ipc socket listen: %s\n", strerror(errno)); 1543 err = errno; 1544 goto fail; 1545 } 1546 1547 #ifndef WITHOUT_CAPSICUM 1548 cap_rights_init(&rights, CAP_ACCEPT, CAP_READ, CAP_RECV, CAP_WRITE, 1549 CAP_SEND, CAP_GETSOCKOPT); 1550 1551 if (caph_rights_limit(socket_fd, &rights) == -1) 1552 errx(EX_OSERR, "Unable to apply rights for sandbox"); 1553 #endif 1554 checkpoint_info = calloc(1, sizeof(*checkpoint_info)); 1555 checkpoint_info->ctx = ctx; 1556 checkpoint_info->socket_fd = socket_fd; 1557 1558 err = pthread_create(&checkpoint_pthread, NULL, checkpoint_thread, 1559 checkpoint_info); 1560 if (err != 0) 1561 goto fail; 1562 1563 return (0); 1564 fail: 1565 free(checkpoint_info); 1566 if (socket_fd > 0) 1567 close(socket_fd); 1568 unlink(addr.sun_path); 1569 1570 return (err); 1571 } 1572 1573 void 1574 vm_snapshot_buf_err(const char *bufname, const enum vm_snapshot_op op) 1575 { 1576 const char *__op; 1577 1578 if (op == VM_SNAPSHOT_SAVE) 1579 __op = "save"; 1580 else if (op == VM_SNAPSHOT_RESTORE) 1581 __op = "restore"; 1582 else 1583 __op = "unknown"; 1584 1585 fprintf(stderr, "%s: snapshot-%s failed for %s\r\n", 1586 __func__, __op, bufname); 1587 } 1588 1589 int 1590 vm_snapshot_buf(void *data, size_t data_size, struct vm_snapshot_meta *meta) 1591 { 1592 struct vm_snapshot_buffer *buffer; 1593 int op; 1594 1595 buffer = &meta->buffer; 1596 op = meta->op; 1597 1598 if (buffer->buf_rem < data_size) { 1599 fprintf(stderr, "%s: buffer too small\r\n", __func__); 1600 return (E2BIG); 1601 } 1602 1603 if (op == VM_SNAPSHOT_SAVE) 1604 memcpy(buffer->buf, data, data_size); 1605 else if (op == VM_SNAPSHOT_RESTORE) 1606 memcpy(data, buffer->buf, data_size); 1607 else 1608 return (EINVAL); 1609 1610 buffer->buf += data_size; 1611 buffer->buf_rem -= data_size; 1612 1613 return (0); 1614 } 1615 1616 size_t 1617 vm_get_snapshot_size(struct vm_snapshot_meta *meta) 1618 { 1619 size_t length; 1620 struct vm_snapshot_buffer *buffer; 1621 1622 buffer = &meta->buffer; 1623 1624 if (buffer->buf_size < buffer->buf_rem) { 1625 fprintf(stderr, "%s: Invalid buffer: size = %zu, rem = %zu\r\n", 1626 __func__, buffer->buf_size, buffer->buf_rem); 1627 length = 0; 1628 } else { 1629 length = buffer->buf_size - buffer->buf_rem; 1630 } 1631 1632 return (length); 1633 } 1634 1635 int 1636 vm_snapshot_guest2host_addr(struct vmctx *ctx, void **addrp, size_t len, 1637 bool restore_null, struct vm_snapshot_meta *meta) 1638 { 1639 int ret; 1640 vm_paddr_t gaddr; 1641 1642 if (meta->op == VM_SNAPSHOT_SAVE) { 1643 gaddr = paddr_host2guest(ctx, *addrp); 1644 if (gaddr == (vm_paddr_t) -1) { 1645 if (!restore_null || 1646 (restore_null && (*addrp != NULL))) { 1647 ret = EFAULT; 1648 goto done; 1649 } 1650 } 1651 1652 SNAPSHOT_VAR_OR_LEAVE(gaddr, meta, ret, done); 1653 } else if (meta->op == VM_SNAPSHOT_RESTORE) { 1654 SNAPSHOT_VAR_OR_LEAVE(gaddr, meta, ret, done); 1655 if (gaddr == (vm_paddr_t) -1) { 1656 if (!restore_null) { 1657 ret = EFAULT; 1658 goto done; 1659 } 1660 } 1661 1662 *addrp = paddr_guest2host(ctx, gaddr, len); 1663 } else { 1664 ret = EINVAL; 1665 } 1666 1667 done: 1668 return (ret); 1669 } 1670 1671 int 1672 vm_snapshot_buf_cmp(void *data, size_t data_size, struct vm_snapshot_meta *meta) 1673 { 1674 struct vm_snapshot_buffer *buffer; 1675 int op; 1676 int ret; 1677 1678 buffer = &meta->buffer; 1679 op = meta->op; 1680 1681 if (buffer->buf_rem < data_size) { 1682 fprintf(stderr, "%s: buffer too small\r\n", __func__); 1683 ret = E2BIG; 1684 goto done; 1685 } 1686 1687 if (op == VM_SNAPSHOT_SAVE) { 1688 ret = 0; 1689 memcpy(buffer->buf, data, data_size); 1690 } else if (op == VM_SNAPSHOT_RESTORE) { 1691 ret = memcmp(data, buffer->buf, data_size); 1692 } else { 1693 ret = EINVAL; 1694 goto done; 1695 } 1696 1697 buffer->buf += data_size; 1698 buffer->buf_rem -= data_size; 1699 1700 done: 1701 return (ret); 1702 } 1703