qemu-config.c

   1 #include "qemu-common.h"
   2 #include "qemu-error.h"
   3 #include "qemu-option.h"
   4 #include "qemu-config.h"
   5 #include "hw/qdev.h"
   6
   7 static QemuOptsList qemu_drive_opts = {
   8     .name = "drive",
   9     .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
  10     .desc = {
  11         {
  12             .name = "bus",
  13             .type = QEMU_OPT_NUMBER,
  14             .help = "bus number",
  15         },{
  16             .name = "unit",
  17             .type = QEMU_OPT_NUMBER,
  18             .help = "unit number (i.e. lun for scsi)",
  19         },{
  20             .name = "if",
  21             .type = QEMU_OPT_STRING,
  22             .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
  23         },{
  24             .name = "index",
  25             .type = QEMU_OPT_NUMBER,
  26             .help = "index number",
  27         },{
  28             .name = "cyls",
  29             .type = QEMU_OPT_NUMBER,
  30             .help = "number of cylinders (ide disk geometry)",
  31         },{
  32             .name = "heads",
  33             .type = QEMU_OPT_NUMBER,
  34             .help = "number of heads (ide disk geometry)",
  35         },{
  36             .name = "secs",
  37             .type = QEMU_OPT_NUMBER,
  38             .help = "number of sectors (ide disk geometry)",
  39         },{
  40             .name = "trans",
  41             .type = QEMU_OPT_STRING,
  42             .help = "chs translation (auto, lba. none)",
  43         },{
  44             .name = "media",
  45             .type = QEMU_OPT_STRING,
  46             .help = "media type (disk, cdrom)",
  47         },{
  48             .name = "snapshot",
  49             .type = QEMU_OPT_BOOL,
  50             .help = "enable/disable snapshot mode",
  51         },{
  52             .name = "file",
  53             .type = QEMU_OPT_STRING,
  54             .help = "disk image",
  55         },{
  56             .name = "cache",
  57             .type = QEMU_OPT_STRING,
  58             .help = "host cache usage (none, writeback, writethrough, "
  59                     "directsync, unsafe)",
  60         },{
  61             .name = "aio",
  62             .type = QEMU_OPT_STRING,
  63             .help = "host AIO implementation (threads, native)",
  64         },{
  65             .name = "format",
  66             .type = QEMU_OPT_STRING,
  67             .help = "disk format (raw, qcow2, ...)",
  68         },{
  69             .name = "serial",
  70             .type = QEMU_OPT_STRING,
  71             .help = "disk serial number",
  72         },{
  73             .name = "rerror",
  74             .type = QEMU_OPT_STRING,
  75             .help = "read error action",
  76         },{
  77             .name = "werror",
  78             .type = QEMU_OPT_STRING,
  79             .help = "write error action",
  80         },{
  81             .name = "addr",
  82             .type = QEMU_OPT_STRING,
  83             .help = "pci address (virtio only)",
  84         },{
  85             .name = "readonly",
  86             .type = QEMU_OPT_BOOL,
  87             .help = "open drive file as read-only",
  88         },{
  89             .name = "iops",
  90             .type = QEMU_OPT_NUMBER,
  91             .help = "limit total I/O operations per second",
  92         },{
  93             .name = "iops_rd",
  94             .type = QEMU_OPT_NUMBER,
  95             .help = "limit read operations per second",
  96         },{
  97             .name = "iops_wr",
  98             .type = QEMU_OPT_NUMBER,
  99             .help = "limit write operations per second",
 100         },{
 101             .name = "bps",
 102             .type = QEMU_OPT_NUMBER,
 103             .help = "limit total bytes per second",
 104         },{
 105             .name = "bps_rd",
 106             .type = QEMU_OPT_NUMBER,
 107             .help = "limit read bytes per second",
 108         },{
 109             .name = "bps_wr",
 110             .type = QEMU_OPT_NUMBER,
 111             .help = "limit write bytes per second",
 112         },{
 113             .name = "copy-on-read",
 114             .type = QEMU_OPT_BOOL,
 115             .help = "copy read data from backing file into image file",
 116         },{
 117             .name = "boot",
 118             .type = QEMU_OPT_BOOL,
 119             .help = "(deprecated, ignored)",
 120         },
 121         { /* end of list */ }
 122     },
 123 };
 124
 125 static QemuOptsList qemu_chardev_opts = {
 126     .name = "chardev",
 127     .implied_opt_name = "backend",
 128     .head = QTAILQ_HEAD_INITIALIZER(qemu_chardev_opts.head),
 129     .desc = {
 130         {
 131             .name = "backend",
 132             .type = QEMU_OPT_STRING,
 133         },{
 134             .name = "path",
 135             .type = QEMU_OPT_STRING,
 136         },{
 137             .name = "host",
 138             .type = QEMU_OPT_STRING,
 139         },{
 140             .name = "port",
 141             .type = QEMU_OPT_STRING,
 142         },{
 143             .name = "localaddr",
 144             .type = QEMU_OPT_STRING,
 145         },{
 146             .name = "localport",
 147             .type = QEMU_OPT_STRING,
 148         },{
 149             .name = "to",
 150             .type = QEMU_OPT_NUMBER,
 151         },{
 152             .name = "ipv4",
 153             .type = QEMU_OPT_BOOL,
 154         },{
 155             .name = "ipv6",
 156             .type = QEMU_OPT_BOOL,
 157         },{
 158             .name = "wait",
 159             .type = QEMU_OPT_BOOL,
 160         },{
 161             .name = "server",
 162             .type = QEMU_OPT_BOOL,
 163         },{
 164             .name = "delay",
 165             .type = QEMU_OPT_BOOL,
 166         },{
 167             .name = "telnet",
 168             .type = QEMU_OPT_BOOL,
 169         },{
 170             .name = "width",
 171             .type = QEMU_OPT_NUMBER,
 172         },{
 173             .name = "height",
 174             .type = QEMU_OPT_NUMBER,
 175         },{
 176             .name = "cols",
 177             .type = QEMU_OPT_NUMBER,
 178         },{
 179             .name = "rows",
 180             .type = QEMU_OPT_NUMBER,
 181         },{
 182             .name = "mux",
 183             .type = QEMU_OPT_BOOL,
 184         },{
 185             .name = "signal",
 186             .type = QEMU_OPT_BOOL,
 187         },{
 188             .name = "name",
 189             .type = QEMU_OPT_STRING,
 190         },{
 191             .name = "debug",
 192             .type = QEMU_OPT_NUMBER,
 193         },
 194         { /* end of list */ }
 195     },
 196 };
 197
 198 QemuOptsList qemu_fsdev_opts = {
 199     .name = "fsdev",
 200     .implied_opt_name = "fsdriver",
 201     .head = QTAILQ_HEAD_INITIALIZER(qemu_fsdev_opts.head),
 202     .desc = {
 203         {
 204             .name = "fsdriver",
 205             .type = QEMU_OPT_STRING,
 206         }, {
 207             .name = "path",
 208             .type = QEMU_OPT_STRING,
 209         }, {
 210             .name = "security_model",
 211             .type = QEMU_OPT_STRING,
 212         }, {
 213             .name = "writeout",
 214             .type = QEMU_OPT_STRING,
 215         }, {
 216             .name = "readonly",
 217             .type = QEMU_OPT_BOOL,
 218
 219         }, {
 220             .name = "socket",
 221             .type = QEMU_OPT_STRING,
 222         }, {
 223             .name = "sock_fd",
 224             .type = QEMU_OPT_NUMBER,
 225         },
 226
 227         { /*End of list */ }
 228     },
 229 };
 230
 231 QemuOptsList qemu_virtfs_opts = {
 232     .name = "virtfs",
 233     .implied_opt_name = "fsdriver",
 234     .head = QTAILQ_HEAD_INITIALIZER(qemu_virtfs_opts.head),
 235     .desc = {
 236         {
 237             .name = "fsdriver",
 238             .type = QEMU_OPT_STRING,
 239         }, {
 240             .name = "path",
 241             .type = QEMU_OPT_STRING,
 242         }, {
 243             .name = "mount_tag",
 244             .type = QEMU_OPT_STRING,
 245         }, {
 246             .name = "security_model",
 247             .type = QEMU_OPT_STRING,
 248         }, {
 249             .name = "writeout",
 250             .type = QEMU_OPT_STRING,
 251         }, {
 252             .name = "readonly",
 253             .type = QEMU_OPT_BOOL,
 254         }, {
 255             .name = "socket",
 256             .type = QEMU_OPT_STRING,
 257         }, {
 258             .name = "sock_fd",
 259             .type = QEMU_OPT_NUMBER,
 260         },
 261
 262         { /*End of list */ }
 263     },
 264 };
 265
 266 static QemuOptsList qemu_device_opts = {
 267     .name = "device",
 268     .implied_opt_name = "driver",
 269     .head = QTAILQ_HEAD_INITIALIZER(qemu_device_opts.head),
 270     .desc = {
 271         /*
 272          * no elements => accept any
 273          * sanity checking will happen later
 274          * when setting device properties
 275          */
 276         { /* end of list */ }
 277     },
 278 };
 279
 280 static QemuOptsList qemu_netdev_opts = {
 281     .name = "netdev",
 282     .implied_opt_name = "type",
 283     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
 284     .desc = {
 285         /*
 286          * no elements => accept any params
 287          * validation will happen later
 288          */
 289         { /* end of list */ }
 290     },
 291 };
 292
 293 static QemuOptsList qemu_net_opts = {
 294     .name = "net",
 295     .implied_opt_name = "type",
 296     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
 297     .desc = {
 298         /*
 299          * no elements => accept any params
 300          * validation will happen later
 301          */
 302         { /* end of list */ }
 303     },
 304 };
 305
 306 static QemuOptsList qemu_rtc_opts = {
 307     .name = "rtc",
 308     .head = QTAILQ_HEAD_INITIALIZER(qemu_rtc_opts.head),
 309     .desc = {
 310         {
 311             .name = "base",
 312             .type = QEMU_OPT_STRING,
 313         },{
 314             .name = "clock",
 315             .type = QEMU_OPT_STRING,
 316         },{
 317             .name = "driftfix",
 318             .type = QEMU_OPT_STRING,
 319         },
 320         { /* end of list */ }
 321     },
 322 };
 323
 324 static QemuOptsList qemu_global_opts = {
 325     .name = "global",
 326     .head = QTAILQ_HEAD_INITIALIZER(qemu_global_opts.head),
 327     .desc = {
 328         {
 329             .name = "driver",
 330             .type = QEMU_OPT_STRING,
 331         },{
 332             .name = "property",
 333             .type = QEMU_OPT_STRING,
 334         },{
 335             .name = "value",
 336             .type = QEMU_OPT_STRING,
 337         },
 338         { /* end of list */ }
 339     },
 340 };
 341
 342 static QemuOptsList qemu_mon_opts = {
 343     .name = "mon",
 344     .implied_opt_name = "chardev",
 345     .head = QTAILQ_HEAD_INITIALIZER(qemu_mon_opts.head),
 346     .desc = {
 347         {
 348             .name = "mode",
 349             .type = QEMU_OPT_STRING,
 350         },{
 351             .name = "chardev",
 352             .type = QEMU_OPT_STRING,
 353         },{
 354             .name = "default",
 355             .type = QEMU_OPT_BOOL,
 356         },{
 357             .name = "pretty",
 358             .type = QEMU_OPT_BOOL,
 359         },
 360         { /* end of list */ }
 361     },
 362 };
 363
 364 static QemuOptsList qemu_trace_opts = {
 365     .name = "trace",
 366     .implied_opt_name = "trace",
 367     .head = QTAILQ_HEAD_INITIALIZER(qemu_trace_opts.head),
 368     .desc = {
 369         {
 370             .name = "events",
 371             .type = QEMU_OPT_STRING,
 372         },{
 373             .name = "file",
 374             .type = QEMU_OPT_STRING,
 375         },
 376         { /* end of list */ }
 377     },
 378 };
 379
 380 static QemuOptsList qemu_cpudef_opts = {
 381     .name = "cpudef",
 382     .head = QTAILQ_HEAD_INITIALIZER(qemu_cpudef_opts.head),
 383     .desc = {
 384         {
 385             .name = "name",
 386             .type = QEMU_OPT_STRING,
 387         },{
 388             .name = "level",
 389             .type = QEMU_OPT_NUMBER,
 390         },{
 391             .name = "vendor",
 392             .type = QEMU_OPT_STRING,
 393         },{
 394             .name = "family",
 395             .type = QEMU_OPT_NUMBER,
 396         },{
 397             .name = "model",
 398             .type = QEMU_OPT_NUMBER,
 399         },{
 400             .name = "stepping",
 401             .type = QEMU_OPT_NUMBER,
 402         },{
 403             .name = "feature_edx",      /* cpuid 0000_0001.edx */
 404             .type = QEMU_OPT_STRING,
 405         },{
 406             .name = "feature_ecx",      /* cpuid 0000_0001.ecx */
 407             .type = QEMU_OPT_STRING,
 408         },{
 409             .name = "extfeature_edx",   /* cpuid 8000_0001.edx */
 410             .type = QEMU_OPT_STRING,
 411         },{
 412             .name = "extfeature_ecx",   /* cpuid 8000_0001.ecx */
 413             .type = QEMU_OPT_STRING,
 414         },{
 415             .name = "xlevel",
 416             .type = QEMU_OPT_NUMBER,
 417         },{
 418             .name = "model_id",
 419             .type = QEMU_OPT_STRING,
 420         },{
 421             .name = "vendor_override",
 422             .type = QEMU_OPT_NUMBER,
 423         },
 424         { /* end of list */ }
 425     },
 426 };
 427
 428 QemuOptsList qemu_spice_opts = {
 429     .name = "spice",
 430     .head = QTAILQ_HEAD_INITIALIZER(qemu_spice_opts.head),
 431     .desc = {
 432         {
 433             .name = "port",
 434             .type = QEMU_OPT_NUMBER,
 435         },{
 436             .name = "tls-port",
 437             .type = QEMU_OPT_NUMBER,
 438         },{
 439             .name = "addr",
 440             .type = QEMU_OPT_STRING,
 441         },{
 442             .name = "ipv4",
 443             .type = QEMU_OPT_BOOL,
 444         },{
 445             .name = "ipv6",
 446             .type = QEMU_OPT_BOOL,
 447         },{
 448             .name = "password",
 449             .type = QEMU_OPT_STRING,
 450         },{
 451             .name = "disable-ticketing",
 452             .type = QEMU_OPT_BOOL,
 453         },{
 454             .name = "disable-copy-paste",
 455             .type = QEMU_OPT_BOOL,
 456         },{
 457             .name = "sasl",
 458             .type = QEMU_OPT_BOOL,
 459         },{
 460             .name = "x509-dir",
 461             .type = QEMU_OPT_STRING,
 462         },{
 463             .name = "x509-key-file",
 464             .type = QEMU_OPT_STRING,
 465         },{
 466             .name = "x509-key-password",
 467             .type = QEMU_OPT_STRING,
 468         },{
 469             .name = "x509-cert-file",
 470             .type = QEMU_OPT_STRING,
 471         },{
 472             .name = "x509-cacert-file",
 473             .type = QEMU_OPT_STRING,
 474         },{
 475             .name = "x509-dh-key-file",
 476             .type = QEMU_OPT_STRING,
 477         },{
 478             .name = "tls-ciphers",
 479             .type = QEMU_OPT_STRING,
 480         },{
 481             .name = "tls-channel",
 482             .type = QEMU_OPT_STRING,
 483         },{
 484             .name = "plaintext-channel",
 485             .type = QEMU_OPT_STRING,
 486         },{
 487             .name = "image-compression",
 488             .type = QEMU_OPT_STRING,
 489         },{
 490             .name = "jpeg-wan-compression",
 491             .type = QEMU_OPT_STRING,
 492         },{
 493             .name = "zlib-glz-wan-compression",
 494             .type = QEMU_OPT_STRING,
 495         },{
 496             .name = "streaming-video",
 497             .type = QEMU_OPT_STRING,
 498         },{
 499             .name = "agent-mouse",
 500             .type = QEMU_OPT_BOOL,
 501         },{
 502             .name = "playback-compression",
 503             .type = QEMU_OPT_BOOL,
 504         },
 505         { /* end of list */ }
 506     },
 507 };
 508
 509 QemuOptsList qemu_option_rom_opts = {
 510     .name = "option-rom",
 511     .implied_opt_name = "romfile",
 512     .head = QTAILQ_HEAD_INITIALIZER(qemu_option_rom_opts.head),
 513     .desc = {
 514         {
 515             .name = "bootindex",
 516             .type = QEMU_OPT_NUMBER,
 517         }, {
 518             .name = "romfile",
 519             .type = QEMU_OPT_STRING,
 520         },
 521         { /* end of list */ }
 522     },
 523 };
 524
 525 static QemuOptsList qemu_machine_opts = {
 526     .name = "machine",
 527     .implied_opt_name = "type",
 528     .head = QTAILQ_HEAD_INITIALIZER(qemu_machine_opts.head),
 529     .desc = {
 530         {
 531             .name = "type",
 532             .type = QEMU_OPT_STRING,
 533             .help = "emulated machine"
 534         }, {
 535             .name = "accel",
 536             .type = QEMU_OPT_STRING,
 537             .help = "accelerator list",
 538         }, {
 539             .name = "kernel_irqchip",
 540             .type = QEMU_OPT_BOOL,
 541             .help = "use KVM in-kernel irqchip",
 542         },
 543         { /* End of list */ }
 544     },
 545 };
 546
 547 QemuOptsList qemu_boot_opts = {
 548     .name = "boot-opts",
 549     .head = QTAILQ_HEAD_INITIALIZER(qemu_boot_opts.head),
 550     .desc = {
 551         /* the three names below are not used now */
 552         {
 553             .name = "order",
 554             .type = QEMU_OPT_STRING,
 555         }, {
 556             .name = "once",
 557             .type = QEMU_OPT_STRING,
 558         }, {
 559             .name = "menu",
 560             .type = QEMU_OPT_STRING,
 561         /* following are really used */
 562         }, {
 563             .name = "splash",
 564             .type = QEMU_OPT_STRING,
 565         }, {
 566             .name = "splash-time",
 567             .type = QEMU_OPT_STRING,
 568         },
 569         { /*End of list */ }
 570     },
 571 };
 572
 573 static QemuOptsList *vm_config_groups[32] = {
 574     &qemu_drive_opts,
 575     &qemu_chardev_opts,
 576     &qemu_device_opts,
 577     &qemu_netdev_opts,
 578     &qemu_net_opts,
 579     &qemu_rtc_opts,
 580     &qemu_global_opts,
 581     &qemu_mon_opts,
 582     &qemu_cpudef_opts,
 583     &qemu_trace_opts,
 584     &qemu_option_rom_opts,
 585     &qemu_machine_opts,
 586     &qemu_boot_opts,
 587     NULL,
 588 };
 589
 590 static QemuOptsList *find_list(QemuOptsList **lists, const char *group)
 591 {
 592     int i;
 593
 594     for (i = 0; lists[i] != NULL; i++) {
 595         if (strcmp(lists[i]->name, group) == 0)
 596             break;
 597     }
 598     if (lists[i] == NULL) {
 599         error_report("there is no option group \"%s\"", group);
 600     }
 601     return lists[i];
 602 }
 603
 604 QemuOptsList *qemu_find_opts(const char *group)
 605 {
 606     return find_list(vm_config_groups, group);
 607 }
 608
 609 void qemu_add_opts(QemuOptsList *list)
 610 {
 611     int entries, i;
 612
 613     entries = ARRAY_SIZE(vm_config_groups);
 614     entries--; /* keep list NULL terminated */
 615     for (i = 0; i < entries; i++) {
 616         if (vm_config_groups[i] == NULL) {
 617             vm_config_groups[i] = list;
 618             return;
 619         }
 620     }
 621     fprintf(stderr, "ran out of space in vm_config_groups");
 622     abort();
 623 }
 624
 625 int qemu_set_option(const char *str)
 626 {
 627     char group[64], id[64], arg[64];
 628     QemuOptsList *list;
 629     QemuOpts *opts;
 630     int rc, offset;
 631
 632     rc = sscanf(str, "%63[^.].%63[^.].%63[^=]%n", group, id, arg, &offset);
 633     if (rc < 3 || str[offset] != '=') {
 634         error_report("can't parse: \"%s\"", str);
 635         return -1;
 636     }
 637
 638     list = qemu_find_opts(group);
 639     if (list == NULL) {
 640         return -1;
 641     }
 642
 643     opts = qemu_opts_find(list, id);
 644     if (!opts) {
 645         error_report("there is no %s \"%s\" defined",
 646                      list->name, id);
 647         return -1;
 648     }
 649
 650     if (qemu_opt_set(opts, arg, str+offset+1) == -1) {
 651         return -1;
 652     }
 653     return 0;
 654 }
 655
 656 int qemu_global_option(const char *str)
 657 {
 658     char driver[64], property[64];
 659     QemuOpts *opts;
 660     int rc, offset;
 661
 662     rc = sscanf(str, "%63[^.].%63[^=]%n", driver, property, &offset);
 663     if (rc < 2 || str[offset] != '=') {
 664         error_report("can't parse: \"%s\"", str);
 665         return -1;
 666     }
 667
 668     opts = qemu_opts_create(&qemu_global_opts, NULL, 0);
 669     qemu_opt_set(opts, "driver", driver);
 670     qemu_opt_set(opts, "property", property);
 671     qemu_opt_set(opts, "value", str+offset+1);
 672     return 0;
 673 }
 674
 675 struct ConfigWriteData {
 676     QemuOptsList *list;
 677     FILE *fp;
 678 };
 679
 680 static int config_write_opt(const char *name, const char *value, void *opaque)
 681 {
 682     struct ConfigWriteData *data = opaque;
 683
 684     fprintf(data->fp, "  %s = \"%s\"\n", name, value);
 685     return 0;
 686 }
 687
 688 static int config_write_opts(QemuOpts *opts, void *opaque)
 689 {
 690     struct ConfigWriteData *data = opaque;
 691     const char *id = qemu_opts_id(opts);
 692
 693     if (id) {
 694         fprintf(data->fp, "[%s \"%s\"]\n", data->list->name, id);
 695     } else {
 696         fprintf(data->fp, "[%s]\n", data->list->name);
 697     }
 698     qemu_opt_foreach(opts, config_write_opt, data, 0);
 699     fprintf(data->fp, "\n");
 700     return 0;
 701 }
 702
 703 void qemu_config_write(FILE *fp)
 704 {
 705     struct ConfigWriteData data = { .fp = fp };
 706     QemuOptsList **lists = vm_config_groups;
 707     int i;
 708
 709     fprintf(fp, "# qemu config file\n\n");
 710     for (i = 0; lists[i] != NULL; i++) {
 711         data.list = lists[i];
 712         qemu_opts_foreach(data.list, config_write_opts, &data, 0);
 713     }
 714 }
 715
 716 int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
 717 {
 718     char line[1024], group[64], id[64], arg[64], value[1024];
 719     Location loc;
 720     QemuOptsList *list = NULL;
 721     QemuOpts *opts = NULL;
 722     int res = -1, lno = 0;
 723
 724     loc_push_none(&loc);
 725     while (fgets(line, sizeof(line), fp) != NULL) {
 726         loc_set_file(fname, ++lno);
 727         if (line[0] == '\n') {
 728             /* skip empty lines */
 729             continue;
 730         }
 731         if (line[0] == '#') {
 732             /* comment */
 733             continue;
 734         }
 735         if (sscanf(line, "[%63s \"%63[^\"]\"]", group, id) == 2) {
 736             /* group with id */
 737             list = find_list(lists, group);
 738             if (list == NULL)
 739                 goto out;
 740             opts = qemu_opts_create(list, id, 1);
 741             continue;
 742         }
 743         if (sscanf(line, "[%63[^]]]", group) == 1) {
 744             /* group without id */
 745             list = find_list(lists, group);
 746             if (list == NULL)
 747                 goto out;
 748             opts = qemu_opts_create(list, NULL, 0);
 749             continue;
 750         }
 751         if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2) {
 752             /* arg = value */
 753             if (opts == NULL) {
 754                 error_report("no group defined");
 755                 goto out;
 756             }
 757             if (qemu_opt_set(opts, arg, value) != 0) {
 758                 goto out;
 759             }
 760             continue;
 761         }
 762         error_report("parse error");
 763         goto out;
 764     }
 765     if (ferror(fp)) {
 766         error_report("error reading file");
 767         goto out;
 768     }
 769     res = 0;
 770 out:
 771     loc_pop(&loc);
 772     return res;
 773 }
 774
 775 int qemu_read_config_file(const char *filename)
 776 {
 777     FILE *f = fopen(filename, "r");
 778     int ret;
 779
 780     if (f == NULL) {
 781         return -errno;
 782     }
 783
 784     ret = qemu_config_parse(f, vm_config_groups, filename);
 785     fclose(f);
 786
 787     if (ret == 0) {
 788         return 0;
 789     } else {
 790         return -EINVAL;
 791     }
 792 }