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 { "vmx", STRUCT_VMX }, 159 { "vioapic", STRUCT_VIOAPIC }, 160 { "vlapic", STRUCT_VLAPIC }, 161 { "vmcx", STRUCT_VMCX }, 162 { "vatpit", STRUCT_VATPIT }, 163 { "vatpic", STRUCT_VATPIC }, 164 { "vpmtmr", STRUCT_VPMTMR }, 165 { "vrtc", STRUCT_VRTC }, 166 }; 167 168 static cpuset_t vcpus_active, vcpus_suspended; 169 static pthread_mutex_t vcpu_lock; 170 static pthread_cond_t vcpus_idle, vcpus_can_run; 171 static bool checkpoint_active; 172 173 /* 174 * TODO: Harden this function and all of its callers since 'base_str' is a user 175 * provided string. 176 */ 177 static char * 178 strcat_extension(const char *base_str, const char *ext) 179 { 180 char *res; 181 size_t base_len, ext_len; 182 183 base_len = strnlen(base_str, NAME_MAX); 184 ext_len = strnlen(ext, NAME_MAX); 185 186 if (base_len + ext_len > NAME_MAX) { 187 fprintf(stderr, "Filename exceeds maximum length.\n"); 188 return (NULL); 189 } 190 191 res = malloc(base_len + ext_len + 1); 192 if (res == NULL) { 193 perror("Failed to allocate memory."); 194 return (NULL); 195 } 196 197 memcpy(res, base_str, base_len); 198 memcpy(res + base_len, ext, ext_len); 199 res[base_len + ext_len] = 0; 200 201 return (res); 202 } 203 204 void 205 destroy_restore_state(struct restore_state *rstate) 206 { 207 if (rstate == NULL) { 208 fprintf(stderr, "Attempting to destroy NULL restore struct.\n"); 209 return; 210 } 211 212 if (rstate->kdata_map != MAP_FAILED) 213 munmap(rstate->kdata_map, rstate->kdata_len); 214 215 if (rstate->kdata_fd > 0) 216 close(rstate->kdata_fd); 217 if (rstate->vmmem_fd > 0) 218 close(rstate->vmmem_fd); 219 220 if (rstate->meta_root_obj != NULL) 221 ucl_object_unref(rstate->meta_root_obj); 222 if (rstate->meta_parser != NULL) 223 ucl_parser_free(rstate->meta_parser); 224 } 225 226 static int 227 load_vmmem_file(const char *filename, struct restore_state *rstate) 228 { 229 struct stat sb; 230 int err; 231 232 rstate->vmmem_fd = open(filename, O_RDONLY); 233 if (rstate->vmmem_fd < 0) { 234 perror("Failed to open restore file"); 235 return (-1); 236 } 237 238 err = fstat(rstate->vmmem_fd, &sb); 239 if (err < 0) { 240 perror("Failed to stat restore file"); 241 goto err_load_vmmem; 242 } 243 244 if (sb.st_size == 0) { 245 fprintf(stderr, "Restore file is empty.\n"); 246 goto err_load_vmmem; 247 } 248 249 rstate->vmmem_len = sb.st_size; 250 251 return (0); 252 253 err_load_vmmem: 254 if (rstate->vmmem_fd > 0) 255 close(rstate->vmmem_fd); 256 return (-1); 257 } 258 259 static int 260 load_kdata_file(const char *filename, struct restore_state *rstate) 261 { 262 struct stat sb; 263 int err; 264 265 rstate->kdata_fd = open(filename, O_RDONLY); 266 if (rstate->kdata_fd < 0) { 267 perror("Failed to open kernel data file"); 268 return (-1); 269 } 270 271 err = fstat(rstate->kdata_fd, &sb); 272 if (err < 0) { 273 perror("Failed to stat kernel data file"); 274 goto err_load_kdata; 275 } 276 277 if (sb.st_size == 0) { 278 fprintf(stderr, "Kernel data file is empty.\n"); 279 goto err_load_kdata; 280 } 281 282 rstate->kdata_len = sb.st_size; 283 rstate->kdata_map = mmap(NULL, rstate->kdata_len, PROT_READ, 284 MAP_SHARED, rstate->kdata_fd, 0); 285 if (rstate->kdata_map == MAP_FAILED) { 286 perror("Failed to map restore file"); 287 goto err_load_kdata; 288 } 289 290 return (0); 291 292 err_load_kdata: 293 if (rstate->kdata_fd > 0) 294 close(rstate->kdata_fd); 295 return (-1); 296 } 297 298 static int 299 load_metadata_file(const char *filename, struct restore_state *rstate) 300 { 301 ucl_object_t *obj; 302 struct ucl_parser *parser; 303 int err; 304 305 parser = ucl_parser_new(UCL_PARSER_DEFAULT); 306 if (parser == NULL) { 307 fprintf(stderr, "Failed to initialize UCL parser.\n"); 308 err = -1; 309 goto err_load_metadata; 310 } 311 312 err = ucl_parser_add_file(parser, filename); 313 if (err == 0) { 314 fprintf(stderr, "Failed to parse metadata file: '%s'\n", 315 filename); 316 err = -1; 317 goto err_load_metadata; 318 } 319 320 obj = ucl_parser_get_object(parser); 321 if (obj == NULL) { 322 fprintf(stderr, "Failed to parse object.\n"); 323 err = -1; 324 goto err_load_metadata; 325 } 326 327 rstate->meta_parser = parser; 328 rstate->meta_root_obj = (ucl_object_t *)obj; 329 330 return (0); 331 332 err_load_metadata: 333 if (parser != NULL) 334 ucl_parser_free(parser); 335 return (err); 336 } 337 338 int 339 load_restore_file(const char *filename, struct restore_state *rstate) 340 { 341 int err = 0; 342 char *kdata_filename = NULL, *meta_filename = NULL; 343 344 assert(filename != NULL); 345 assert(rstate != NULL); 346 347 memset(rstate, 0, sizeof(*rstate)); 348 rstate->kdata_map = MAP_FAILED; 349 350 err = load_vmmem_file(filename, rstate); 351 if (err != 0) { 352 fprintf(stderr, "Failed to load guest RAM file.\n"); 353 goto err_restore; 354 } 355 356 kdata_filename = strcat_extension(filename, ".kern"); 357 if (kdata_filename == NULL) { 358 fprintf(stderr, "Failed to construct kernel data filename.\n"); 359 goto err_restore; 360 } 361 362 err = load_kdata_file(kdata_filename, rstate); 363 if (err != 0) { 364 fprintf(stderr, "Failed to load guest kernel data file.\n"); 365 goto err_restore; 366 } 367 368 meta_filename = strcat_extension(filename, ".meta"); 369 if (meta_filename == NULL) { 370 fprintf(stderr, "Failed to construct kernel metadata filename.\n"); 371 goto err_restore; 372 } 373 374 err = load_metadata_file(meta_filename, rstate); 375 if (err != 0) { 376 fprintf(stderr, "Failed to load guest metadata file.\n"); 377 goto err_restore; 378 } 379 380 return (0); 381 382 err_restore: 383 destroy_restore_state(rstate); 384 if (kdata_filename != NULL) 385 free(kdata_filename); 386 if (meta_filename != NULL) 387 free(meta_filename); 388 return (-1); 389 } 390 391 #define JSON_GET_INT_OR_RETURN(key, obj, result_ptr, ret) \ 392 do { \ 393 const ucl_object_t *obj__; \ 394 obj__ = ucl_object_lookup(obj, key); \ 395 if (obj__ == NULL) { \ 396 fprintf(stderr, "Missing key: '%s'", key); \ 397 return (ret); \ 398 } \ 399 if (!ucl_object_toint_safe(obj__, result_ptr)) { \ 400 fprintf(stderr, "Cannot convert '%s' value to int.", key); \ 401 return (ret); \ 402 } \ 403 } while(0) 404 405 #define JSON_GET_STRING_OR_RETURN(key, obj, result_ptr, ret) \ 406 do { \ 407 const ucl_object_t *obj__; \ 408 obj__ = ucl_object_lookup(obj, key); \ 409 if (obj__ == NULL) { \ 410 fprintf(stderr, "Missing key: '%s'", key); \ 411 return (ret); \ 412 } \ 413 if (!ucl_object_tostring_safe(obj__, result_ptr)) { \ 414 fprintf(stderr, "Cannot convert '%s' value to string.", key); \ 415 return (ret); \ 416 } \ 417 } while(0) 418 419 static void * 420 lookup_struct(enum snapshot_req struct_id, struct restore_state *rstate, 421 size_t *struct_size) 422 { 423 const ucl_object_t *structs = NULL, *obj = NULL; 424 ucl_object_iter_t it = NULL; 425 int64_t snapshot_req, size, file_offset; 426 427 structs = ucl_object_lookup(rstate->meta_root_obj, JSON_STRUCT_ARR_KEY); 428 if (structs == NULL) { 429 fprintf(stderr, "Failed to find '%s' object.\n", 430 JSON_STRUCT_ARR_KEY); 431 return (NULL); 432 } 433 434 if (ucl_object_type(structs) != UCL_ARRAY) { 435 fprintf(stderr, "Object '%s' is not an array.\n", 436 JSON_STRUCT_ARR_KEY); 437 return (NULL); 438 } 439 440 while ((obj = ucl_object_iterate(structs, &it, true)) != NULL) { 441 snapshot_req = -1; 442 JSON_GET_INT_OR_RETURN(JSON_SNAPSHOT_REQ_KEY, obj, 443 &snapshot_req, NULL); 444 assert(snapshot_req >= 0); 445 if ((enum snapshot_req) snapshot_req == struct_id) { 446 JSON_GET_INT_OR_RETURN(JSON_SIZE_KEY, obj, 447 &size, NULL); 448 assert(size >= 0); 449 450 JSON_GET_INT_OR_RETURN(JSON_FILE_OFFSET_KEY, obj, 451 &file_offset, NULL); 452 assert(file_offset >= 0); 453 assert(file_offset + size <= 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(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 .ctx = ctx, 890 .dev_name = info->struct_name, 891 .dev_req = info->req, 892 893 .buffer.buf_start = struct_ptr, 894 .buffer.buf_size = struct_size, 895 896 .buffer.buf = struct_ptr, 897 .buffer.buf_rem = struct_size, 898 899 .op = VM_SNAPSHOT_RESTORE, 900 }; 901 902 ret = vm_snapshot_req(meta); 903 if (ret != 0) { 904 fprintf(stderr, "%s: Failed to restore struct: %s\r\n", 905 __func__, info->struct_name); 906 goto done; 907 } 908 909 done: 910 return (ret); 911 } 912 913 int 914 vm_restore_kern_structs(struct vmctx *ctx, struct restore_state *rstate) 915 { 916 size_t i; 917 int ret; 918 919 for (i = 0; i < nitems(snapshot_kern_structs); i++) { 920 ret = vm_restore_kern_struct(ctx, rstate, 921 &snapshot_kern_structs[i]); 922 if (ret != 0) 923 return (ret); 924 } 925 926 return (0); 927 } 928 929 static int 930 vm_restore_user_dev(struct vmctx *ctx, struct restore_state *rstate, 931 const struct vm_snapshot_dev_info *info) 932 { 933 void *dev_ptr; 934 size_t dev_size; 935 int ret; 936 struct vm_snapshot_meta *meta; 937 938 dev_ptr = lookup_dev(info->dev_name, rstate, &dev_size); 939 if (dev_ptr == NULL) { 940 fprintf(stderr, "Failed to lookup dev: %s\r\n", info->dev_name); 941 fprintf(stderr, "Continuing the restore/migration process\r\n"); 942 return (0); 943 } 944 945 if (dev_size == 0) { 946 fprintf(stderr, "%s: Device size is 0. " 947 "Assuming %s is not used\r\n", 948 __func__, info->dev_name); 949 return (0); 950 } 951 952 meta = &(struct vm_snapshot_meta) { 953 .ctx = ctx, 954 .dev_name = info->dev_name, 955 956 .buffer.buf_start = dev_ptr, 957 .buffer.buf_size = dev_size, 958 959 .buffer.buf = dev_ptr, 960 .buffer.buf_rem = dev_size, 961 962 .op = VM_SNAPSHOT_RESTORE, 963 }; 964 965 ret = (*info->snapshot_cb)(meta); 966 if (ret != 0) { 967 fprintf(stderr, "Failed to restore dev: %s\r\n", 968 info->dev_name); 969 return (-1); 970 } 971 972 return (0); 973 } 974 975 976 int 977 vm_restore_user_devs(struct vmctx *ctx, struct restore_state *rstate) 978 { 979 size_t i; 980 int ret; 981 982 for (i = 0; i < nitems(snapshot_devs); i++) { 983 ret = vm_restore_user_dev(ctx, rstate, &snapshot_devs[i]); 984 if (ret != 0) 985 return (ret); 986 } 987 988 return 0; 989 } 990 991 int 992 vm_pause_user_devs(struct vmctx *ctx) 993 { 994 const struct vm_snapshot_dev_info *info; 995 size_t i; 996 int ret; 997 998 for (i = 0; i < nitems(snapshot_devs); i++) { 999 info = &snapshot_devs[i]; 1000 if (info->pause_cb == NULL) 1001 continue; 1002 1003 ret = info->pause_cb(ctx, info->dev_name); 1004 if (ret != 0) 1005 return (ret); 1006 } 1007 1008 return (0); 1009 } 1010 1011 int 1012 vm_resume_user_devs(struct vmctx *ctx) 1013 { 1014 const struct vm_snapshot_dev_info *info; 1015 size_t i; 1016 int ret; 1017 1018 for (i = 0; i < nitems(snapshot_devs); i++) { 1019 info = &snapshot_devs[i]; 1020 if (info->resume_cb == NULL) 1021 continue; 1022 1023 ret = info->resume_cb(ctx, info->dev_name); 1024 if (ret != 0) 1025 return (ret); 1026 } 1027 1028 return (0); 1029 } 1030 1031 static int 1032 vm_snapshot_kern_struct(int data_fd, xo_handle_t *xop, const char *array_key, 1033 struct vm_snapshot_meta *meta, off_t *offset) 1034 { 1035 int ret; 1036 size_t data_size; 1037 ssize_t write_cnt; 1038 1039 ret = vm_snapshot_req(meta); 1040 if (ret != 0) { 1041 fprintf(stderr, "%s: Failed to snapshot struct %s\r\n", 1042 __func__, meta->dev_name); 1043 ret = -1; 1044 goto done; 1045 } 1046 1047 data_size = vm_get_snapshot_size(meta); 1048 1049 write_cnt = write(data_fd, meta->buffer.buf_start, data_size); 1050 if (write_cnt != data_size) { 1051 perror("Failed to write all snapshotted data."); 1052 ret = -1; 1053 goto done; 1054 } 1055 1056 /* Write metadata. */ 1057 xo_open_instance_h(xop, array_key); 1058 xo_emit_h(xop, "{:debug_name/%s}\n", meta->dev_name); 1059 xo_emit_h(xop, "{:" JSON_SNAPSHOT_REQ_KEY "/%d}\n", 1060 meta->dev_req); 1061 xo_emit_h(xop, "{:" JSON_SIZE_KEY "/%lu}\n", data_size); 1062 xo_emit_h(xop, "{:" JSON_FILE_OFFSET_KEY "/%lu}\n", *offset); 1063 xo_close_instance_h(xop, JSON_STRUCT_ARR_KEY); 1064 1065 *offset += data_size; 1066 1067 done: 1068 return (ret); 1069 } 1070 1071 static int 1072 vm_snapshot_kern_structs(struct vmctx *ctx, int data_fd, xo_handle_t *xop) 1073 { 1074 int ret, error; 1075 size_t buf_size, i, offset; 1076 char *buffer; 1077 struct vm_snapshot_meta *meta; 1078 1079 error = 0; 1080 offset = 0; 1081 buf_size = SNAPSHOT_BUFFER_SIZE; 1082 1083 buffer = malloc(SNAPSHOT_BUFFER_SIZE * sizeof(char)); 1084 if (buffer == NULL) { 1085 error = ENOMEM; 1086 perror("Failed to allocate memory for snapshot buffer"); 1087 goto err_vm_snapshot_kern_data; 1088 } 1089 1090 meta = &(struct vm_snapshot_meta) { 1091 .ctx = ctx, 1092 1093 .buffer.buf_start = buffer, 1094 .buffer.buf_size = buf_size, 1095 1096 .op = VM_SNAPSHOT_SAVE, 1097 }; 1098 1099 xo_open_list_h(xop, JSON_STRUCT_ARR_KEY); 1100 for (i = 0; i < nitems(snapshot_kern_structs); i++) { 1101 meta->dev_name = snapshot_kern_structs[i].struct_name; 1102 meta->dev_req = snapshot_kern_structs[i].req; 1103 1104 memset(meta->buffer.buf_start, 0, meta->buffer.buf_size); 1105 meta->buffer.buf = meta->buffer.buf_start; 1106 meta->buffer.buf_rem = meta->buffer.buf_size; 1107 1108 ret = vm_snapshot_kern_struct(data_fd, xop, JSON_DEV_ARR_KEY, 1109 meta, &offset); 1110 if (ret != 0) { 1111 error = -1; 1112 goto err_vm_snapshot_kern_data; 1113 } 1114 } 1115 xo_close_list_h(xop, JSON_STRUCT_ARR_KEY); 1116 1117 err_vm_snapshot_kern_data: 1118 if (buffer != NULL) 1119 free(buffer); 1120 return (error); 1121 } 1122 1123 static int 1124 vm_snapshot_basic_metadata(struct vmctx *ctx, xo_handle_t *xop, size_t memsz) 1125 { 1126 1127 xo_open_container_h(xop, JSON_BASIC_METADATA_KEY); 1128 xo_emit_h(xop, "{:" JSON_NCPUS_KEY "/%ld}\n", guest_ncpus); 1129 xo_emit_h(xop, "{:" JSON_VMNAME_KEY "/%s}\n", vm_get_name(ctx)); 1130 xo_emit_h(xop, "{:" JSON_MEMSIZE_KEY "/%lu}\n", memsz); 1131 xo_emit_h(xop, "{:" JSON_MEMFLAGS_KEY "/%d}\n", vm_get_memflags(ctx)); 1132 xo_close_container_h(xop, JSON_BASIC_METADATA_KEY); 1133 1134 return (0); 1135 } 1136 1137 static int 1138 vm_snapshot_dev_write_data(int data_fd, xo_handle_t *xop, const char *array_key, 1139 struct vm_snapshot_meta *meta, off_t *offset) 1140 { 1141 int ret; 1142 size_t data_size; 1143 1144 data_size = vm_get_snapshot_size(meta); 1145 1146 ret = write(data_fd, meta->buffer.buf_start, data_size); 1147 if (ret != data_size) { 1148 perror("Failed to write all snapshotted data."); 1149 return (-1); 1150 } 1151 1152 /* Write metadata. */ 1153 xo_open_instance_h(xop, array_key); 1154 xo_emit_h(xop, "{:" JSON_SNAPSHOT_REQ_KEY "/%s}\n", meta->dev_name); 1155 xo_emit_h(xop, "{:" JSON_SIZE_KEY "/%lu}\n", data_size); 1156 xo_emit_h(xop, "{:" JSON_FILE_OFFSET_KEY "/%lu}\n", *offset); 1157 xo_close_instance_h(xop, array_key); 1158 1159 *offset += data_size; 1160 1161 return (0); 1162 } 1163 1164 static int 1165 vm_snapshot_user_dev(const struct vm_snapshot_dev_info *info, 1166 int data_fd, xo_handle_t *xop, 1167 struct vm_snapshot_meta *meta, off_t *offset) 1168 { 1169 int ret; 1170 1171 ret = (*info->snapshot_cb)(meta); 1172 if (ret != 0) { 1173 fprintf(stderr, "Failed to snapshot %s; ret=%d\r\n", 1174 meta->dev_name, ret); 1175 return (ret); 1176 } 1177 1178 ret = vm_snapshot_dev_write_data(data_fd, xop, JSON_DEV_ARR_KEY, meta, 1179 offset); 1180 if (ret != 0) 1181 return (ret); 1182 1183 return (0); 1184 } 1185 1186 static int 1187 vm_snapshot_user_devs(struct vmctx *ctx, int data_fd, xo_handle_t *xop) 1188 { 1189 int ret; 1190 off_t offset; 1191 void *buffer; 1192 size_t buf_size, i; 1193 struct vm_snapshot_meta *meta; 1194 1195 buf_size = SNAPSHOT_BUFFER_SIZE; 1196 1197 offset = lseek(data_fd, 0, SEEK_CUR); 1198 if (offset < 0) { 1199 perror("Failed to get data file current offset."); 1200 return (-1); 1201 } 1202 1203 buffer = malloc(buf_size); 1204 if (buffer == NULL) { 1205 perror("Failed to allocate memory for snapshot buffer"); 1206 ret = ENOSPC; 1207 goto snapshot_err; 1208 } 1209 1210 meta = &(struct vm_snapshot_meta) { 1211 .ctx = ctx, 1212 1213 .buffer.buf_start = buffer, 1214 .buffer.buf_size = buf_size, 1215 1216 .op = VM_SNAPSHOT_SAVE, 1217 }; 1218 1219 xo_open_list_h(xop, JSON_DEV_ARR_KEY); 1220 1221 /* Restore other devices that support this feature */ 1222 for (i = 0; i < nitems(snapshot_devs); i++) { 1223 meta->dev_name = snapshot_devs[i].dev_name; 1224 1225 memset(meta->buffer.buf_start, 0, meta->buffer.buf_size); 1226 meta->buffer.buf = meta->buffer.buf_start; 1227 meta->buffer.buf_rem = meta->buffer.buf_size; 1228 1229 ret = vm_snapshot_user_dev(&snapshot_devs[i], data_fd, xop, 1230 meta, &offset); 1231 if (ret != 0) 1232 goto snapshot_err; 1233 } 1234 1235 xo_close_list_h(xop, JSON_DEV_ARR_KEY); 1236 1237 snapshot_err: 1238 if (buffer != NULL) 1239 free(buffer); 1240 return (ret); 1241 } 1242 1243 void 1244 checkpoint_cpu_add(int vcpu) 1245 { 1246 1247 pthread_mutex_lock(&vcpu_lock); 1248 CPU_SET(vcpu, &vcpus_active); 1249 1250 if (checkpoint_active) { 1251 CPU_SET(vcpu, &vcpus_suspended); 1252 while (checkpoint_active) 1253 pthread_cond_wait(&vcpus_can_run, &vcpu_lock); 1254 CPU_CLR(vcpu, &vcpus_suspended); 1255 } 1256 pthread_mutex_unlock(&vcpu_lock); 1257 } 1258 1259 /* 1260 * When a vCPU is suspended for any reason, it calls 1261 * checkpoint_cpu_suspend(). This records that the vCPU is idle. 1262 * Before returning from suspension, checkpoint_cpu_resume() is 1263 * called. In suspend we note that the vCPU is idle. In resume we 1264 * pause the vCPU thread until the checkpoint is complete. The reason 1265 * for the two-step process is that vCPUs might already be stopped in 1266 * the debug server when a checkpoint is requested. This approach 1267 * allows us to account for and handle those vCPUs. 1268 */ 1269 void 1270 checkpoint_cpu_suspend(int vcpu) 1271 { 1272 1273 pthread_mutex_lock(&vcpu_lock); 1274 CPU_SET(vcpu, &vcpus_suspended); 1275 if (checkpoint_active && CPU_CMP(&vcpus_active, &vcpus_suspended) == 0) 1276 pthread_cond_signal(&vcpus_idle); 1277 pthread_mutex_unlock(&vcpu_lock); 1278 } 1279 1280 void 1281 checkpoint_cpu_resume(int vcpu) 1282 { 1283 1284 pthread_mutex_lock(&vcpu_lock); 1285 while (checkpoint_active) 1286 pthread_cond_wait(&vcpus_can_run, &vcpu_lock); 1287 CPU_CLR(vcpu, &vcpus_suspended); 1288 pthread_mutex_unlock(&vcpu_lock); 1289 } 1290 1291 static void 1292 vm_vcpu_pause(struct vmctx *ctx) 1293 { 1294 1295 pthread_mutex_lock(&vcpu_lock); 1296 checkpoint_active = true; 1297 vm_suspend_cpu(ctx, -1); 1298 while (CPU_CMP(&vcpus_active, &vcpus_suspended) != 0) 1299 pthread_cond_wait(&vcpus_idle, &vcpu_lock); 1300 pthread_mutex_unlock(&vcpu_lock); 1301 } 1302 1303 static void 1304 vm_vcpu_resume(struct vmctx *ctx) 1305 { 1306 1307 pthread_mutex_lock(&vcpu_lock); 1308 checkpoint_active = false; 1309 pthread_mutex_unlock(&vcpu_lock); 1310 vm_resume_cpu(ctx, -1); 1311 pthread_cond_broadcast(&vcpus_can_run); 1312 } 1313 1314 static int 1315 vm_checkpoint(struct vmctx *ctx, const char *checkpoint_file, bool stop_vm) 1316 { 1317 int fd_checkpoint = 0, kdata_fd = 0; 1318 int ret = 0; 1319 int error = 0; 1320 size_t memsz; 1321 xo_handle_t *xop = NULL; 1322 char *meta_filename = NULL; 1323 char *kdata_filename = NULL; 1324 FILE *meta_file = NULL; 1325 1326 kdata_filename = strcat_extension(checkpoint_file, ".kern"); 1327 if (kdata_filename == NULL) { 1328 fprintf(stderr, "Failed to construct kernel data filename.\n"); 1329 return (-1); 1330 } 1331 1332 kdata_fd = open(kdata_filename, O_WRONLY | O_CREAT | O_TRUNC, 0700); 1333 if (kdata_fd < 0) { 1334 perror("Failed to open kernel data snapshot file."); 1335 error = -1; 1336 goto done; 1337 } 1338 1339 fd_checkpoint = open(checkpoint_file, O_RDWR | O_CREAT | O_TRUNC, 0700); 1340 1341 if (fd_checkpoint < 0) { 1342 perror("Failed to create checkpoint file"); 1343 error = -1; 1344 goto done; 1345 } 1346 1347 meta_filename = strcat_extension(checkpoint_file, ".meta"); 1348 if (meta_filename == NULL) { 1349 fprintf(stderr, "Failed to construct vm metadata filename.\n"); 1350 goto done; 1351 } 1352 1353 meta_file = fopen(meta_filename, "w"); 1354 if (meta_file == NULL) { 1355 perror("Failed to open vm metadata snapshot file."); 1356 goto done; 1357 } 1358 1359 xop = xo_create_to_file(meta_file, XO_STYLE_JSON, XOF_PRETTY); 1360 if (xop == NULL) { 1361 perror("Failed to get libxo handle on metadata file."); 1362 goto done; 1363 } 1364 1365 vm_vcpu_pause(ctx); 1366 1367 ret = vm_pause_user_devs(ctx); 1368 if (ret != 0) { 1369 fprintf(stderr, "Could not pause devices\r\n"); 1370 error = ret; 1371 goto done; 1372 } 1373 1374 memsz = vm_snapshot_mem(ctx, fd_checkpoint, 0, true); 1375 if (memsz == 0) { 1376 perror("Could not write guest memory to file"); 1377 error = -1; 1378 goto done; 1379 } 1380 1381 ret = vm_snapshot_basic_metadata(ctx, xop, memsz); 1382 if (ret != 0) { 1383 fprintf(stderr, "Failed to snapshot vm basic metadata.\n"); 1384 error = -1; 1385 goto done; 1386 } 1387 1388 1389 ret = vm_snapshot_kern_structs(ctx, kdata_fd, xop); 1390 if (ret != 0) { 1391 fprintf(stderr, "Failed to snapshot vm kernel data.\n"); 1392 error = -1; 1393 goto done; 1394 } 1395 1396 ret = vm_snapshot_user_devs(ctx, kdata_fd, xop); 1397 if (ret != 0) { 1398 fprintf(stderr, "Failed to snapshot device state.\n"); 1399 error = -1; 1400 goto done; 1401 } 1402 1403 xo_finish_h(xop); 1404 1405 if (stop_vm) { 1406 vm_destroy(ctx); 1407 exit(0); 1408 } 1409 1410 done: 1411 ret = vm_resume_user_devs(ctx); 1412 if (ret != 0) 1413 fprintf(stderr, "Could not resume devices\r\n"); 1414 vm_vcpu_resume(ctx); 1415 if (fd_checkpoint > 0) 1416 close(fd_checkpoint); 1417 if (meta_filename != NULL) 1418 free(meta_filename); 1419 if (kdata_filename != NULL) 1420 free(kdata_filename); 1421 if (xop != NULL) 1422 xo_destroy(xop); 1423 if (meta_file != NULL) 1424 fclose(meta_file); 1425 if (kdata_fd > 0) 1426 close(kdata_fd); 1427 return (error); 1428 } 1429 1430 static int 1431 handle_message(struct vmctx *ctx, nvlist_t *nvl) 1432 { 1433 const char *cmd; 1434 struct ipc_command **ipc_cmd; 1435 1436 if (!nvlist_exists_string(nvl, "cmd")) 1437 return (EINVAL); 1438 1439 cmd = nvlist_get_string(nvl, "cmd"); 1440 IPC_COMMAND_FOREACH(ipc_cmd, ipc_cmd_set) { 1441 if (strcmp(cmd, (*ipc_cmd)->name) == 0) 1442 return ((*ipc_cmd)->handler(ctx, nvl)); 1443 } 1444 1445 return (EOPNOTSUPP); 1446 } 1447 1448 /* 1449 * Listen for commands from bhyvectl 1450 */ 1451 void * 1452 checkpoint_thread(void *param) 1453 { 1454 int fd; 1455 struct checkpoint_thread_info *thread_info; 1456 nvlist_t *nvl; 1457 1458 pthread_set_name_np(pthread_self(), "checkpoint thread"); 1459 thread_info = (struct checkpoint_thread_info *)param; 1460 1461 while ((fd = accept(thread_info->socket_fd, NULL, NULL)) != -1) { 1462 nvl = nvlist_recv(fd, 0); 1463 if (nvl != NULL) 1464 handle_message(thread_info->ctx, nvl); 1465 else 1466 EPRINTLN("nvlist_recv() failed: %s", strerror(errno)); 1467 1468 close(fd); 1469 nvlist_destroy(nvl); 1470 } 1471 1472 return (NULL); 1473 } 1474 1475 static int 1476 vm_do_checkpoint(struct vmctx *ctx, const nvlist_t *nvl) 1477 { 1478 int error; 1479 1480 if (!nvlist_exists_string(nvl, "filename") || 1481 !nvlist_exists_bool(nvl, "suspend")) 1482 error = EINVAL; 1483 else 1484 error = vm_checkpoint(ctx, nvlist_get_string(nvl, "filename"), 1485 nvlist_get_bool(nvl, "suspend")); 1486 1487 return (error); 1488 } 1489 IPC_COMMAND(ipc_cmd_set, checkpoint, vm_do_checkpoint); 1490 1491 void 1492 init_snapshot(void) 1493 { 1494 int err; 1495 1496 err = pthread_mutex_init(&vcpu_lock, NULL); 1497 if (err != 0) 1498 errc(1, err, "checkpoint mutex init"); 1499 err = pthread_cond_init(&vcpus_idle, NULL); 1500 if (err != 0) 1501 errc(1, err, "checkpoint cv init (vcpus_idle)"); 1502 err = pthread_cond_init(&vcpus_can_run, NULL); 1503 if (err != 0) 1504 errc(1, err, "checkpoint cv init (vcpus_can_run)"); 1505 } 1506 1507 /* 1508 * Create the listening socket for IPC with bhyvectl 1509 */ 1510 int 1511 init_checkpoint_thread(struct vmctx *ctx) 1512 { 1513 struct checkpoint_thread_info *checkpoint_info = NULL; 1514 struct sockaddr_un addr; 1515 int socket_fd; 1516 pthread_t checkpoint_pthread; 1517 int err; 1518 1519 memset(&addr, 0, sizeof(addr)); 1520 1521 socket_fd = socket(PF_UNIX, SOCK_STREAM, 0); 1522 if (socket_fd < 0) { 1523 EPRINTLN("Socket creation failed: %s", strerror(errno)); 1524 err = -1; 1525 goto fail; 1526 } 1527 1528 addr.sun_family = AF_UNIX; 1529 1530 snprintf(addr.sun_path, sizeof(addr.sun_path), "%s%s", 1531 BHYVE_RUN_DIR, vm_get_name(ctx)); 1532 addr.sun_len = SUN_LEN(&addr); 1533 unlink(addr.sun_path); 1534 1535 if (bind(socket_fd, (struct sockaddr *)&addr, addr.sun_len) != 0) { 1536 EPRINTLN("Failed to bind socket \"%s\": %s\n", 1537 addr.sun_path, strerror(errno)); 1538 err = -1; 1539 goto fail; 1540 } 1541 1542 if (listen(socket_fd, 10) < 0) { 1543 EPRINTLN("ipc socket listen: %s\n", strerror(errno)); 1544 err = errno; 1545 goto fail; 1546 } 1547 1548 checkpoint_info = calloc(1, sizeof(*checkpoint_info)); 1549 checkpoint_info->ctx = ctx; 1550 checkpoint_info->socket_fd = socket_fd; 1551 1552 err = pthread_create(&checkpoint_pthread, NULL, checkpoint_thread, 1553 checkpoint_info); 1554 if (err != 0) 1555 goto fail; 1556 1557 return (0); 1558 fail: 1559 free(checkpoint_info); 1560 if (socket_fd > 0) 1561 close(socket_fd); 1562 unlink(addr.sun_path); 1563 1564 return (err); 1565 } 1566 1567 void 1568 vm_snapshot_buf_err(const char *bufname, const enum vm_snapshot_op op) 1569 { 1570 const char *__op; 1571 1572 if (op == VM_SNAPSHOT_SAVE) 1573 __op = "save"; 1574 else if (op == VM_SNAPSHOT_RESTORE) 1575 __op = "restore"; 1576 else 1577 __op = "unknown"; 1578 1579 fprintf(stderr, "%s: snapshot-%s failed for %s\r\n", 1580 __func__, __op, bufname); 1581 } 1582 1583 int 1584 vm_snapshot_buf(volatile void *data, size_t data_size, 1585 struct vm_snapshot_meta *meta) 1586 { 1587 struct vm_snapshot_buffer *buffer; 1588 int op; 1589 1590 buffer = &meta->buffer; 1591 op = meta->op; 1592 1593 if (buffer->buf_rem < data_size) { 1594 fprintf(stderr, "%s: buffer too small\r\n", __func__); 1595 return (E2BIG); 1596 } 1597 1598 if (op == VM_SNAPSHOT_SAVE) 1599 memcpy(buffer->buf, (uint8_t *) data, data_size); 1600 else if (op == VM_SNAPSHOT_RESTORE) 1601 memcpy((uint8_t *) data, buffer->buf, data_size); 1602 else 1603 return (EINVAL); 1604 1605 buffer->buf += data_size; 1606 buffer->buf_rem -= data_size; 1607 1608 return (0); 1609 } 1610 1611 size_t 1612 vm_get_snapshot_size(struct vm_snapshot_meta *meta) 1613 { 1614 size_t length; 1615 struct vm_snapshot_buffer *buffer; 1616 1617 buffer = &meta->buffer; 1618 1619 if (buffer->buf_size < buffer->buf_rem) { 1620 fprintf(stderr, "%s: Invalid buffer: size = %zu, rem = %zu\r\n", 1621 __func__, buffer->buf_size, buffer->buf_rem); 1622 length = 0; 1623 } else { 1624 length = buffer->buf_size - buffer->buf_rem; 1625 } 1626 1627 return (length); 1628 } 1629 1630 int 1631 vm_snapshot_guest2host_addr(void **addrp, size_t len, bool restore_null, 1632 struct vm_snapshot_meta *meta) 1633 { 1634 int ret; 1635 vm_paddr_t gaddr; 1636 1637 if (meta->op == VM_SNAPSHOT_SAVE) { 1638 gaddr = paddr_host2guest(meta->ctx, *addrp); 1639 if (gaddr == (vm_paddr_t) -1) { 1640 if (!restore_null || 1641 (restore_null && (*addrp != NULL))) { 1642 ret = EFAULT; 1643 goto done; 1644 } 1645 } 1646 1647 SNAPSHOT_VAR_OR_LEAVE(gaddr, meta, ret, done); 1648 } else if (meta->op == VM_SNAPSHOT_RESTORE) { 1649 SNAPSHOT_VAR_OR_LEAVE(gaddr, meta, ret, done); 1650 if (gaddr == (vm_paddr_t) -1) { 1651 if (!restore_null) { 1652 ret = EFAULT; 1653 goto done; 1654 } 1655 } 1656 1657 *addrp = paddr_guest2host(meta->ctx, gaddr, len); 1658 } else { 1659 ret = EINVAL; 1660 } 1661 1662 done: 1663 return (ret); 1664 } 1665 1666 int 1667 vm_snapshot_buf_cmp(volatile void *data, size_t data_size, 1668 struct vm_snapshot_meta *meta) 1669 { 1670 struct vm_snapshot_buffer *buffer; 1671 int op; 1672 int ret; 1673 1674 buffer = &meta->buffer; 1675 op = meta->op; 1676 1677 if (buffer->buf_rem < data_size) { 1678 fprintf(stderr, "%s: buffer too small\r\n", __func__); 1679 ret = E2BIG; 1680 goto done; 1681 } 1682 1683 if (op == VM_SNAPSHOT_SAVE) { 1684 ret = 0; 1685 memcpy(buffer->buf, (uint8_t *) data, data_size); 1686 } else if (op == VM_SNAPSHOT_RESTORE) { 1687 ret = memcmp((uint8_t *) data, buffer->buf, data_size); 1688 } else { 1689 ret = EINVAL; 1690 goto done; 1691 } 1692 1693 buffer->buf += data_size; 1694 buffer->buf_rem -= data_size; 1695 1696 done: 1697 return (ret); 1698 } 1699