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 #include "error.h"
   7
   8 static QemuOptsList qemu_drive_opts = {
   9     .name = "drive",
  10     .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
  11     .desc = {
  12         {
  13             .name = "bus",
  14             .type = QEMU_OPT_NUMBER,
  15             .help = "bus number",
  16         },{
  17             .name = "unit",
  18             .type = QEMU_OPT_NUMBER,
  19             .help = "unit number (i.e. lun for scsi)",
  20         },{
  21             .name = "if",
  22             .type = QEMU_OPT_STRING,
  23             .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
  24         },{
  25             .name = "index",
  26             .type = QEMU_OPT_NUMBER,
  27             .help = "index number",
  28         },{
  29             .name = "cyls",
  30             .type = QEMU_OPT_NUMBER,
  31             .help = "number of cylinders (ide disk geometry)",
  32         },{
  33             .name = "heads",
  34             .type = QEMU_OPT_NUMBER,
  35             .help = "number of heads (ide disk geometry)",
  36         },{
  37             .name = "secs",
  38             .type = QEMU_OPT_NUMBER,
  39             .help = "number of sectors (ide disk geometry)",
  40         },{
  41             .name = "trans",
  42             .type = QEMU_OPT_STRING,
  43             .help = "chs translation (auto, lba. none)",
  44         },{
  45             .name = "media",
  46             .type = QEMU_OPT_STRING,
  47             .help = "media type (disk, cdrom)",
  48         },{
  49             .name = "snapshot",
  50             .type = QEMU_OPT_BOOL,
  51             .help = "enable/disable snapshot mode",
  52         },{
  53             .name = "file",
  54             .type = QEMU_OPT_STRING,
  55             .help = "disk image",
  56         },{
  57             .name = "cache",
  58             .type = QEMU_OPT_STRING,
  59             .help = "host cache usage (none, writeback, writethrough, "
  60                     "directsync, unsafe)",
  61         },{
  62             .name = "aio",
  63             .type = QEMU_OPT_STRING,
  64             .help = "host AIO implementation (threads, native)",
  65         },{
  66             .name = "format",
  67             .type = QEMU_OPT_STRING,
  68             .help = "disk format (raw, qcow2, ...)",
  69         },{
  70             .name = "serial",
  71             .type = QEMU_OPT_STRING,
  72             .help = "disk serial number",
  73         },{
  74             .name = "rerror",
  75             .type = QEMU_OPT_STRING,
  76             .help = "read error action",
  77         },{
  78             .name = "werror",
  79             .type = QEMU_OPT_STRING,
  80             .help = "write error action",
  81         },{
  82             .name = "addr",
  83             .type = QEMU_OPT_STRING,
  84             .help = "pci address (virtio only)",
  85         },{
  86             .name = "readonly",
  87             .type = QEMU_OPT_BOOL,
  88             .help = "open drive file as read-only",
  89         },{
  90             .name = "iops",
  91             .type = QEMU_OPT_NUMBER,
  92             .help = "limit total I/O operations per second",
  93         },{
  94             .name = "iops_rd",
  95             .type = QEMU_OPT_NUMBER,
  96             .help = "limit read operations per second",
  97         },{
  98             .name = "iops_wr",
  99             .type = QEMU_OPT_NUMBER,
 100             .help = "limit write operations per second",
 101         },{
 102             .name = "bps",
 103             .type = QEMU_OPT_NUMBER,
 104             .help = "limit total bytes per second",
 105         },{
 106             .name = "bps_rd",
 107             .type = QEMU_OPT_NUMBER,
 108             .help = "limit read bytes per second",
 109         },{
 110             .name = "bps_wr",
 111             .type = QEMU_OPT_NUMBER,
 112             .help = "limit write bytes per second",
 113         },{
 114             .name = "copy-on-read",
 115             .type = QEMU_OPT_BOOL,
 116             .help = "copy read data from backing file into image file",
 117         },{
 118             .name = "boot",
 119             .type = QEMU_OPT_BOOL,
 120             .help = "(deprecated, ignored)",
 121         },
 122         { /* end of list */ }
 123     },
 124 };
 125
 126 static QemuOptsList qemu_iscsi_opts = {
 127     .name = "iscsi",
 128     .head = QTAILQ_HEAD_INITIALIZER(qemu_iscsi_opts.head),
 129     .desc = {
 130         {
 131             .name = "user",
 132             .type = QEMU_OPT_STRING,
 133             .help = "username for CHAP authentication to target",
 134         },{
 135             .name = "password",
 136             .type = QEMU_OPT_STRING,
 137             .help = "password for CHAP authentication to target",
 138         },{
 139             .name = "header-digest",
 140             .type = QEMU_OPT_STRING,
 141             .help = "HeaderDigest setting. "
 142                     "{CRC32C|CRC32C-NONE|NONE-CRC32C|NONE}",
 143         },{
 144             .name = "initiator-name",
 145             .type = QEMU_OPT_STRING,
 146             .help = "Initiator iqn name to use when connecting",
 147         },
 148         { /* end of list */ }
 149     },
 150 };
 151
 152 static QemuOptsList qemu_chardev_opts = {
 153     .name = "chardev",
 154     .implied_opt_name = "backend",
 155     .head = QTAILQ_HEAD_INITIALIZER(qemu_chardev_opts.head),
 156     .desc = {
 157         {
 158             .name = "backend",
 159             .type = QEMU_OPT_STRING,
 160         },{
 161             .name = "path",
 162             .type = QEMU_OPT_STRING,
 163         },{
 164             .name = "host",
 165             .type = QEMU_OPT_STRING,
 166         },{
 167             .name = "port",
 168             .type = QEMU_OPT_STRING,
 169         },{
 170             .name = "localaddr",
 171             .type = QEMU_OPT_STRING,
 172         },{
 173             .name = "localport",
 174             .type = QEMU_OPT_STRING,
 175         },{
 176             .name = "to",
 177             .type = QEMU_OPT_NUMBER,
 178         },{
 179             .name = "ipv4",
 180             .type = QEMU_OPT_BOOL,
 181         },{
 182             .name = "ipv6",
 183             .type = QEMU_OPT_BOOL,
 184         },{
 185             .name = "wait",
 186             .type = QEMU_OPT_BOOL,
 187         },{
 188             .name = "server",
 189             .type = QEMU_OPT_BOOL,
 190         },{
 191             .name = "delay",
 192             .type = QEMU_OPT_BOOL,
 193         },{
 194             .name = "telnet",
 195             .type = QEMU_OPT_BOOL,
 196         },{
 197             .name = "width",
 198             .type = QEMU_OPT_NUMBER,
 199         },{
 200             .name = "height",
 201             .type = QEMU_OPT_NUMBER,
 202         },{
 203             .name = "cols",
 204             .type = QEMU_OPT_NUMBER,
 205         },{
 206             .name = "rows",
 207             .type = QEMU_OPT_NUMBER,
 208         },{
 209             .name = "mux",
 210             .type = QEMU_OPT_BOOL,
 211         },{
 212             .name = "signal",
 213             .type = QEMU_OPT_BOOL,
 214         },{
 215             .name = "name",
 216             .type = QEMU_OPT_STRING,
 217         },{
 218             .name = "debug",
 219             .type = QEMU_OPT_NUMBER,
 220         },
 221         { /* end of list */ }
 222     },
 223 };
 224
 225 QemuOptsList qemu_fsdev_opts = {
 226     .name = "fsdev",
 227     .implied_opt_name = "fsdriver",
 228     .head = QTAILQ_HEAD_INITIALIZER(qemu_fsdev_opts.head),
 229     .desc = {
 230         {
 231             .name = "fsdriver",
 232             .type = QEMU_OPT_STRING,
 233         }, {
 234             .name = "path",
 235             .type = QEMU_OPT_STRING,
 236         }, {
 237             .name = "security_model",
 238             .type = QEMU_OPT_STRING,
 239         }, {
 240             .name = "writeout",
 241             .type = QEMU_OPT_STRING,
 242         }, {
 243             .name = "readonly",
 244             .type = QEMU_OPT_BOOL,
 245
 246         }, {
 247             .name = "socket",
 248             .type = QEMU_OPT_STRING,
 249         }, {
 250             .name = "sock_fd",
 251             .type = QEMU_OPT_NUMBER,
 252         },
 253
 254         { /*End of list */ }
 255     },
 256 };
 257
 258 QemuOptsList qemu_virtfs_opts = {
 259     .name = "virtfs",
 260     .implied_opt_name = "fsdriver",
 261     .head = QTAILQ_HEAD_INITIALIZER(qemu_virtfs_opts.head),
 262     .desc = {
 263         {
 264             .name = "fsdriver",
 265             .type = QEMU_OPT_STRING,
 266         }, {
 267             .name = "path",
 268             .type = QEMU_OPT_STRING,
 269         }, {
 270             .name = "mount_tag",
 271             .type = QEMU_OPT_STRING,
 272         }, {
 273             .name = "security_model",
 274             .type = QEMU_OPT_STRING,
 275         }, {
 276             .name = "writeout",
 277             .type = QEMU_OPT_STRING,
 278         }, {
 279             .name = "readonly",
 280             .type = QEMU_OPT_BOOL,
 281         }, {
 282             .name = "socket",
 283             .type = QEMU_OPT_STRING,
 284         }, {
 285             .name = "sock_fd",
 286             .type = QEMU_OPT_NUMBER,
 287         },
 288
 289         { /*End of list */ }
 290     },
 291 };
 292
 293 static QemuOptsList qemu_device_opts = {
 294     .name = "device",
 295     .implied_opt_name = "driver",
 296     .head = QTAILQ_HEAD_INITIALIZER(qemu_device_opts.head),
 297     .desc = {
 298         /*
 299          * no elements => accept any
 300          * sanity checking will happen later
 301          * when setting device properties
 302          */
 303         { /* end of list */ }
 304     },
 305 };
 306
 307 static QemuOptsList qemu_netdev_opts = {
 308     .name = "netdev",
 309     .implied_opt_name = "type",
 310     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
 311     .desc = {
 312         /*
 313          * no elements => accept any params
 314          * validation will happen later
 315          */
 316         { /* end of list */ }
 317     },
 318 };
 319
 320 static QemuOptsList qemu_net_opts = {
 321     .name = "net",
 322     .implied_opt_name = "type",
 323     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
 324     .desc = {
 325         /*
 326          * no elements => accept any params
 327          * validation will happen later
 328          */
 329         { /* end of list */ }
 330     },
 331 };
 332
 333 static QemuOptsList qemu_rtc_opts = {
 334     .name = "rtc",
 335     .head = QTAILQ_HEAD_INITIALIZER(qemu_rtc_opts.head),
 336     .desc = {
 337         {
 338             .name = "base",
 339             .type = QEMU_OPT_STRING,
 340         },{
 341             .name = "clock",
 342             .type = QEMU_OPT_STRING,
 343         },{
 344             .name = "driftfix",
 345             .type = QEMU_OPT_STRING,
 346         },
 347         { /* end of list */ }
 348     },
 349 };
 350
 351 static QemuOptsList qemu_global_opts = {
 352     .name = "global",
 353     .head = QTAILQ_HEAD_INITIALIZER(qemu_global_opts.head),
 354     .desc = {
 355         {
 356             .name = "driver",
 357             .type = QEMU_OPT_STRING,
 358         },{
 359             .name = "property",
 360             .type = QEMU_OPT_STRING,
 361         },{
 362             .name = "value",
 363             .type = QEMU_OPT_STRING,
 364         },
 365         { /* end of list */ }
 366     },
 367 };
 368
 369 static QemuOptsList qemu_mon_opts = {
 370     .name = "mon",
 371     .implied_opt_name = "chardev",
 372     .head = QTAILQ_HEAD_INITIALIZER(qemu_mon_opts.head),
 373     .desc = {
 374         {
 375             .name = "mode",
 376             .type = QEMU_OPT_STRING,
 377         },{
 378             .name = "chardev",
 379             .type = QEMU_OPT_STRING,
 380         },{
 381             .name = "default",
 382             .type = QEMU_OPT_BOOL,
 383         },{
 384             .name = "pretty",
 385             .type = QEMU_OPT_BOOL,
 386         },
 387         { /* end of list */ }
 388     },
 389 };
 390
 391 static QemuOptsList qemu_trace_opts = {
 392     .name = "trace",
 393     .implied_opt_name = "trace",
 394     .head = QTAILQ_HEAD_INITIALIZER(qemu_trace_opts.head),
 395     .desc = {
 396         {
 397             .name = "events",
 398             .type = QEMU_OPT_STRING,
 399         },{
 400             .name = "file",
 401             .type = QEMU_OPT_STRING,
 402         },
 403         { /* end of list */ }
 404     },
 405 };
 406
 407 static QemuOptsList qemu_cpudef_opts = {
 408     .name = "cpudef",
 409     .head = QTAILQ_HEAD_INITIALIZER(qemu_cpudef_opts.head),
 410     .desc = {
 411         {
 412             .name = "name",
 413             .type = QEMU_OPT_STRING,
 414         },{
 415             .name = "level",
 416             .type = QEMU_OPT_NUMBER,
 417         },{
 418             .name = "vendor",
 419             .type = QEMU_OPT_STRING,
 420         },{
 421             .name = "family",
 422             .type = QEMU_OPT_NUMBER,
 423         },{
 424             .name = "model",
 425             .type = QEMU_OPT_NUMBER,
 426         },{
 427             .name = "stepping",
 428             .type = QEMU_OPT_NUMBER,
 429         },{
 430             .name = "feature_edx",      /* cpuid 0000_0001.edx */
 431             .type = QEMU_OPT_STRING,
 432         },{
 433             .name = "feature_ecx",      /* cpuid 0000_0001.ecx */
 434             .type = QEMU_OPT_STRING,
 435         },{
 436             .name = "extfeature_edx",   /* cpuid 8000_0001.edx */
 437             .type = QEMU_OPT_STRING,
 438         },{
 439             .name = "extfeature_ecx",   /* cpuid 8000_0001.ecx */
 440             .type = QEMU_OPT_STRING,
 441         },{
 442             .name = "xlevel",
 443             .type = QEMU_OPT_NUMBER,
 444         },{
 445             .name = "model_id",
 446             .type = QEMU_OPT_STRING,
 447         },{
 448             .name = "vendor_override",
 449             .type = QEMU_OPT_NUMBER,
 450         },
 451         { /* end of list */ }
 452     },
 453 };
 454
 455 QemuOptsList qemu_spice_opts = {
 456     .name = "spice",
 457     .head = QTAILQ_HEAD_INITIALIZER(qemu_spice_opts.head),
 458     .desc = {
 459         {
 460             .name = "port",
 461             .type = QEMU_OPT_NUMBER,
 462         },{
 463             .name = "tls-port",
 464             .type = QEMU_OPT_NUMBER,
 465         },{
 466             .name = "addr",
 467             .type = QEMU_OPT_STRING,
 468         },{
 469             .name = "ipv4",
 470             .type = QEMU_OPT_BOOL,
 471         },{
 472             .name = "ipv6",
 473             .type = QEMU_OPT_BOOL,
 474         },{
 475             .name = "password",
 476             .type = QEMU_OPT_STRING,
 477         },{
 478             .name = "disable-ticketing",
 479             .type = QEMU_OPT_BOOL,
 480         },{
 481             .name = "disable-copy-paste",
 482             .type = QEMU_OPT_BOOL,
 483         },{
 484             .name = "sasl",
 485             .type = QEMU_OPT_BOOL,
 486         },{
 487             .name = "x509-dir",
 488             .type = QEMU_OPT_STRING,
 489         },{
 490             .name = "x509-key-file",
 491             .type = QEMU_OPT_STRING,
 492         },{
 493             .name = "x509-key-password",
 494             .type = QEMU_OPT_STRING,
 495         },{
 496             .name = "x509-cert-file",
 497             .type = QEMU_OPT_STRING,
 498         },{
 499             .name = "x509-cacert-file",
 500             .type = QEMU_OPT_STRING,
 501         },{
 502             .name = "x509-dh-key-file",
 503             .type = QEMU_OPT_STRING,
 504         },{
 505             .name = "tls-ciphers",
 506             .type = QEMU_OPT_STRING,
 507         },{
 508             .name = "tls-channel",
 509             .type = QEMU_OPT_STRING,
 510         },{
 511             .name = "plaintext-channel",
 512             .type = QEMU_OPT_STRING,
 513         },{
 514             .name = "image-compression",
 515             .type = QEMU_OPT_STRING,
 516         },{
 517             .name = "jpeg-wan-compression",
 518             .type = QEMU_OPT_STRING,
 519         },{
 520             .name = "zlib-glz-wan-compression",
 521             .type = QEMU_OPT_STRING,
 522         },{
 523             .name = "streaming-video",
 524             .type = QEMU_OPT_STRING,
 525         },{
 526             .name = "agent-mouse",
 527             .type = QEMU_OPT_BOOL,
 528         },{
 529             .name = "playback-compression",
 530             .type = QEMU_OPT_BOOL,
 531         },
 532         { /* end of list */ }
 533     },
 534 };
 535
 536 QemuOptsList qemu_option_rom_opts = {
 537     .name = "option-rom",
 538     .implied_opt_name = "romfile",
 539     .head = QTAILQ_HEAD_INITIALIZER(qemu_option_rom_opts.head),
 540     .desc = {
 541         {
 542             .name = "bootindex",
 543             .type = QEMU_OPT_NUMBER,
 544         }, {
 545             .name = "romfile",
 546             .type = QEMU_OPT_STRING,
 547         },
 548         { /* end of list */ }
 549     },
 550 };
 551
 552 static QemuOptsList qemu_machine_opts = {
 553     .name = "machine",
 554     .implied_opt_name = "type",
 555     .merge_lists = true,
 556     .head = QTAILQ_HEAD_INITIALIZER(qemu_machine_opts.head),
 557     .desc = {
 558         {
 559             .name = "type",
 560             .type = QEMU_OPT_STRING,
 561             .help = "emulated machine"
 562         }, {
 563             .name = "accel",
 564             .type = QEMU_OPT_STRING,
 565             .help = "accelerator list",
 566         }, {
 567             .name = "kernel_irqchip",
 568             .type = QEMU_OPT_BOOL,
 569             .help = "use KVM in-kernel irqchip",
 570         }, {
 571             .name = "kvm_shadow_mem",
 572             .type = QEMU_OPT_SIZE,
 573             .help = "KVM shadow MMU size",
 574         }, {
 575             .name = "kernel",
 576             .type = QEMU_OPT_STRING,
 577             .help = "Linux kernel image file",
 578         }, {
 579             .name = "initrd",
 580             .type = QEMU_OPT_STRING,
 581             .help = "Linux initial ramdisk file",
 582         }, {
 583             .name = "append",
 584             .type = QEMU_OPT_STRING,
 585             .help = "Linux kernel command line",
 586         }, {
 587             .name = "dtb",
 588             .type = QEMU_OPT_STRING,
 589             .help = "Linux kernel device tree file",
 590         }, {
 591             .name = "dumpdtb",
 592             .type = QEMU_OPT_STRING,
 593             .help = "Dump current dtb to a file and quit",
 594         }, {
 595             .name = "phandle_start",
 596             .type = QEMU_OPT_STRING,
 597             .help = "The first phandle ID we may generate dynamically",
 598         }, {
 599             .name = "dt_compatible",
 600             .type = QEMU_OPT_STRING,
 601             .help = "Overrides the \"compatible\" property of the dt root node",
 602         },
 603         { /* End of list */ }
 604     },
 605 };
 606
 607 QemuOptsList qemu_boot_opts = {
 608     .name = "boot-opts",
 609     .head = QTAILQ_HEAD_INITIALIZER(qemu_boot_opts.head),
 610     .desc = {
 611         /* the three names below are not used now */
 612         {
 613             .name = "order",
 614             .type = QEMU_OPT_STRING,
 615         }, {
 616             .name = "once",
 617             .type = QEMU_OPT_STRING,
 618         }, {
 619             .name = "menu",
 620             .type = QEMU_OPT_STRING,
 621         /* following are really used */
 622         }, {
 623             .name = "splash",
 624             .type = QEMU_OPT_STRING,
 625         }, {
 626             .name = "splash-time",
 627             .type = QEMU_OPT_STRING,
 628         },
 629         { /*End of list */ }
 630     },
 631 };
 632
 633 static QemuOptsList *vm_config_groups[32] = {
 634     &qemu_drive_opts,
 635     &qemu_chardev_opts,
 636     &qemu_device_opts,
 637     &qemu_netdev_opts,
 638     &qemu_net_opts,
 639     &qemu_rtc_opts,
 640     &qemu_global_opts,
 641     &qemu_mon_opts,
 642     &qemu_cpudef_opts,
 643     &qemu_trace_opts,
 644     &qemu_option_rom_opts,
 645     &qemu_machine_opts,
 646     &qemu_boot_opts,
 647     &qemu_iscsi_opts,
 648     NULL,
 649 };
 650
 651 static QemuOptsList *find_list(QemuOptsList **lists, const char *group,
 652                                Error **errp)
 653 {
 654     int i;
 655
 656     for (i = 0; lists[i] != NULL; i++) {
 657         if (strcmp(lists[i]->name, group) == 0)
 658             break;
 659     }
 660     if (lists[i] == NULL) {
 661         error_set(errp, QERR_INVALID_OPTION_GROUP, group);
 662     }
 663     return lists[i];
 664 }
 665
 666 QemuOptsList *qemu_find_opts(const char *group)
 667 {
 668     QemuOptsList *ret;
 669     Error *local_err = NULL;
 670
 671     ret = find_list(vm_config_groups, group, &local_err);
 672     if (error_is_set(&local_err)) {
 673         error_report("%s\n", error_get_pretty(local_err));
 674         error_free(local_err);
 675     }
 676
 677     return ret;
 678 }
 679
 680 QemuOptsList *qemu_find_opts_err(const char *group, Error **errp)
 681 {
 682     return find_list(vm_config_groups, group, errp);
 683 }
 684
 685 void qemu_add_opts(QemuOptsList *list)
 686 {
 687     int entries, i;
 688
 689     entries = ARRAY_SIZE(vm_config_groups);
 690     entries--; /* keep list NULL terminated */
 691     for (i = 0; i < entries; i++) {
 692         if (vm_config_groups[i] == NULL) {
 693             vm_config_groups[i] = list;
 694             return;
 695         }
 696     }
 697     fprintf(stderr, "ran out of space in vm_config_groups");
 698     abort();
 699 }
 700
 701 int qemu_set_option(const char *str)
 702 {
 703     char group[64], id[64], arg[64];
 704     QemuOptsList *list;
 705     QemuOpts *opts;
 706     int rc, offset;
 707
 708     rc = sscanf(str, "%63[^.].%63[^.].%63[^=]%n", group, id, arg, &offset);
 709     if (rc < 3 || str[offset] != '=') {
 710         error_report("can't parse: \"%s\"", str);
 711         return -1;
 712     }
 713
 714     list = qemu_find_opts(group);
 715     if (list == NULL) {
 716         return -1;
 717     }
 718
 719     opts = qemu_opts_find(list, id);
 720     if (!opts) {
 721         error_report("there is no %s \"%s\" defined",
 722                      list->name, id);
 723         return -1;
 724     }
 725
 726     if (qemu_opt_set(opts, arg, str+offset+1) == -1) {
 727         return -1;
 728     }
 729     return 0;
 730 }
 731
 732 int qemu_global_option(const char *str)
 733 {
 734     char driver[64], property[64];
 735     QemuOpts *opts;
 736     int rc, offset;
 737
 738     rc = sscanf(str, "%63[^.].%63[^=]%n", driver, property, &offset);
 739     if (rc < 2 || str[offset] != '=') {
 740         error_report("can't parse: \"%s\"", str);
 741         return -1;
 742     }
 743
 744     opts = qemu_opts_create(&qemu_global_opts, NULL, 0, NULL);
 745     qemu_opt_set(opts, "driver", driver);
 746     qemu_opt_set(opts, "property", property);
 747     qemu_opt_set(opts, "value", str+offset+1);
 748     return 0;
 749 }
 750
 751 struct ConfigWriteData {
 752     QemuOptsList *list;
 753     FILE *fp;
 754 };
 755
 756 static int config_write_opt(const char *name, const char *value, void *opaque)
 757 {
 758     struct ConfigWriteData *data = opaque;
 759
 760     fprintf(data->fp, "  %s = \"%s\"\n", name, value);
 761     return 0;
 762 }
 763
 764 static int config_write_opts(QemuOpts *opts, void *opaque)
 765 {
 766     struct ConfigWriteData *data = opaque;
 767     const char *id = qemu_opts_id(opts);
 768
 769     if (id) {
 770         fprintf(data->fp, "[%s \"%s\"]\n", data->list->name, id);
 771     } else {
 772         fprintf(data->fp, "[%s]\n", data->list->name);
 773     }
 774     qemu_opt_foreach(opts, config_write_opt, data, 0);
 775     fprintf(data->fp, "\n");
 776     return 0;
 777 }
 778
 779 void qemu_config_write(FILE *fp)
 780 {
 781     struct ConfigWriteData data = { .fp = fp };
 782     QemuOptsList **lists = vm_config_groups;
 783     int i;
 784
 785     fprintf(fp, "# qemu config file\n\n");
 786     for (i = 0; lists[i] != NULL; i++) {
 787         data.list = lists[i];
 788         qemu_opts_foreach(data.list, config_write_opts, &data, 0);
 789     }
 790 }
 791
 792 int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
 793 {
 794     char line[1024], group[64], id[64], arg[64], value[1024];
 795     Location loc;
 796     QemuOptsList *list = NULL;
 797     Error *local_err = NULL;
 798     QemuOpts *opts = NULL;
 799     int res = -1, lno = 0;
 800
 801     loc_push_none(&loc);
 802     while (fgets(line, sizeof(line), fp) != NULL) {
 803         loc_set_file(fname, ++lno);
 804         if (line[0] == '\n') {
 805             /* skip empty lines */
 806             continue;
 807         }
 808         if (line[0] == '#') {
 809             /* comment */
 810             continue;
 811         }
 812         if (sscanf(line, "[%63s \"%63[^\"]\"]", group, id) == 2) {
 813             /* group with id */
 814             list = find_list(lists, group, &local_err);
 815             if (error_is_set(&local_err)) {
 816                 error_report("%s\n", error_get_pretty(local_err));
 817                 error_free(local_err);
 818                 goto out;
 819             }
 820             opts = qemu_opts_create(list, id, 1, NULL);
 821             continue;
 822         }
 823         if (sscanf(line, "[%63[^]]]", group) == 1) {
 824             /* group without id */
 825             list = find_list(lists, group, &local_err);
 826             if (error_is_set(&local_err)) {
 827                 error_report("%s\n", error_get_pretty(local_err));
 828                 error_free(local_err);
 829                 goto out;
 830             }
 831             opts = qemu_opts_create(list, NULL, 0, NULL);
 832             continue;
 833         }
 834         if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2) {
 835             /* arg = value */
 836             if (opts == NULL) {
 837                 error_report("no group defined");
 838                 goto out;
 839             }
 840             if (qemu_opt_set(opts, arg, value) != 0) {
 841                 goto out;
 842             }
 843             continue;
 844         }
 845         error_report("parse error");
 846         goto out;
 847     }
 848     if (ferror(fp)) {
 849         error_report("error reading file");
 850         goto out;
 851     }
 852     res = 0;
 853 out:
 854     loc_pop(&loc);
 855     return res;
 856 }
 857
 858 int qemu_read_config_file(const char *filename)
 859 {
 860     FILE *f = fopen(filename, "r");
 861     int ret;
 862
 863     if (f == NULL) {
 864         return -errno;
 865     }
 866
 867     ret = qemu_config_parse(f, vm_config_groups, filename);
 868     fclose(f);
 869
 870     if (ret == 0) {
 871         return 0;
 872     } else {
 873         return -EINVAL;
 874     }
 875 }