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