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         { /* end of list */ }
 119     },
 120 };
 121
 122 static QemuOptsList qemu_iscsi_opts = {
 123     .name = "iscsi",
 124     .head = QTAILQ_HEAD_INITIALIZER(qemu_iscsi_opts.head),
 125     .desc = {
 126         {
 127             .name = "user",
 128             .type = QEMU_OPT_STRING,
 129             .help = "username for CHAP authentication to target",
 130         },{
 131             .name = "password",
 132             .type = QEMU_OPT_STRING,
 133             .help = "password for CHAP authentication to target",
 134         },{
 135             .name = "header-digest",
 136             .type = QEMU_OPT_STRING,
 137             .help = "HeaderDigest setting. "
 138                     "{CRC32C|CRC32C-NONE|NONE-CRC32C|NONE}",
 139         },{
 140             .name = "initiator-name",
 141             .type = QEMU_OPT_STRING,
 142             .help = "Initiator iqn name to use when connecting",
 143         },
 144         { /* end of list */ }
 145     },
 146 };
 147
 148 static QemuOptsList qemu_chardev_opts = {
 149     .name = "chardev",
 150     .implied_opt_name = "backend",
 151     .head = QTAILQ_HEAD_INITIALIZER(qemu_chardev_opts.head),
 152     .desc = {
 153         {
 154             .name = "backend",
 155             .type = QEMU_OPT_STRING,
 156         },{
 157             .name = "path",
 158             .type = QEMU_OPT_STRING,
 159         },{
 160             .name = "host",
 161             .type = QEMU_OPT_STRING,
 162         },{
 163             .name = "port",
 164             .type = QEMU_OPT_STRING,
 165         },{
 166             .name = "localaddr",
 167             .type = QEMU_OPT_STRING,
 168         },{
 169             .name = "localport",
 170             .type = QEMU_OPT_STRING,
 171         },{
 172             .name = "to",
 173             .type = QEMU_OPT_NUMBER,
 174         },{
 175             .name = "ipv4",
 176             .type = QEMU_OPT_BOOL,
 177         },{
 178             .name = "ipv6",
 179             .type = QEMU_OPT_BOOL,
 180         },{
 181             .name = "wait",
 182             .type = QEMU_OPT_BOOL,
 183         },{
 184             .name = "server",
 185             .type = QEMU_OPT_BOOL,
 186         },{
 187             .name = "delay",
 188             .type = QEMU_OPT_BOOL,
 189         },{
 190             .name = "telnet",
 191             .type = QEMU_OPT_BOOL,
 192         },{
 193             .name = "width",
 194             .type = QEMU_OPT_NUMBER,
 195         },{
 196             .name = "height",
 197             .type = QEMU_OPT_NUMBER,
 198         },{
 199             .name = "cols",
 200             .type = QEMU_OPT_NUMBER,
 201         },{
 202             .name = "rows",
 203             .type = QEMU_OPT_NUMBER,
 204         },{
 205             .name = "mux",
 206             .type = QEMU_OPT_BOOL,
 207         },{
 208             .name = "signal",
 209             .type = QEMU_OPT_BOOL,
 210         },{
 211             .name = "name",
 212             .type = QEMU_OPT_STRING,
 213         },{
 214             .name = "debug",
 215             .type = QEMU_OPT_NUMBER,
 216         },
 217         { /* end of list */ }
 218     },
 219 };
 220
 221 QemuOptsList qemu_fsdev_opts = {
 222     .name = "fsdev",
 223     .implied_opt_name = "fsdriver",
 224     .head = QTAILQ_HEAD_INITIALIZER(qemu_fsdev_opts.head),
 225     .desc = {
 226         {
 227             .name = "fsdriver",
 228             .type = QEMU_OPT_STRING,
 229         }, {
 230             .name = "path",
 231             .type = QEMU_OPT_STRING,
 232         }, {
 233             .name = "security_model",
 234             .type = QEMU_OPT_STRING,
 235         }, {
 236             .name = "writeout",
 237             .type = QEMU_OPT_STRING,
 238         }, {
 239             .name = "readonly",
 240             .type = QEMU_OPT_BOOL,
 241
 242         }, {
 243             .name = "socket",
 244             .type = QEMU_OPT_STRING,
 245         }, {
 246             .name = "sock_fd",
 247             .type = QEMU_OPT_NUMBER,
 248         },
 249
 250         { /*End of list */ }
 251     },
 252 };
 253
 254 QemuOptsList qemu_virtfs_opts = {
 255     .name = "virtfs",
 256     .implied_opt_name = "fsdriver",
 257     .head = QTAILQ_HEAD_INITIALIZER(qemu_virtfs_opts.head),
 258     .desc = {
 259         {
 260             .name = "fsdriver",
 261             .type = QEMU_OPT_STRING,
 262         }, {
 263             .name = "path",
 264             .type = QEMU_OPT_STRING,
 265         }, {
 266             .name = "mount_tag",
 267             .type = QEMU_OPT_STRING,
 268         }, {
 269             .name = "security_model",
 270             .type = QEMU_OPT_STRING,
 271         }, {
 272             .name = "writeout",
 273             .type = QEMU_OPT_STRING,
 274         }, {
 275             .name = "readonly",
 276             .type = QEMU_OPT_BOOL,
 277         }, {
 278             .name = "socket",
 279             .type = QEMU_OPT_STRING,
 280         }, {
 281             .name = "sock_fd",
 282             .type = QEMU_OPT_NUMBER,
 283         },
 284
 285         { /*End of list */ }
 286     },
 287 };
 288
 289 static QemuOptsList qemu_device_opts = {
 290     .name = "device",
 291     .implied_opt_name = "driver",
 292     .head = QTAILQ_HEAD_INITIALIZER(qemu_device_opts.head),
 293     .desc = {
 294         /*
 295          * no elements => accept any
 296          * sanity checking will happen later
 297          * when setting device properties
 298          */
 299         { /* end of list */ }
 300     },
 301 };
 302
 303 static QemuOptsList qemu_netdev_opts = {
 304     .name = "netdev",
 305     .implied_opt_name = "type",
 306     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
 307     .desc = {
 308         /*
 309          * no elements => accept any params
 310          * validation will happen later
 311          */
 312         { /* end of list */ }
 313     },
 314 };
 315
 316 static QemuOptsList qemu_net_opts = {
 317     .name = "net",
 318     .implied_opt_name = "type",
 319     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
 320     .desc = {
 321         /*
 322          * no elements => accept any params
 323          * validation will happen later
 324          */
 325         { /* end of list */ }
 326     },
 327 };
 328
 329 static QemuOptsList qemu_rtc_opts = {
 330     .name = "rtc",
 331     .head = QTAILQ_HEAD_INITIALIZER(qemu_rtc_opts.head),
 332     .desc = {
 333         {
 334             .name = "base",
 335             .type = QEMU_OPT_STRING,
 336         },{
 337             .name = "clock",
 338             .type = QEMU_OPT_STRING,
 339         },{
 340             .name = "driftfix",
 341             .type = QEMU_OPT_STRING,
 342         },
 343         { /* end of list */ }
 344     },
 345 };
 346
 347 static QemuOptsList qemu_global_opts = {
 348     .name = "global",
 349     .head = QTAILQ_HEAD_INITIALIZER(qemu_global_opts.head),
 350     .desc = {
 351         {
 352             .name = "driver",
 353             .type = QEMU_OPT_STRING,
 354         },{
 355             .name = "property",
 356             .type = QEMU_OPT_STRING,
 357         },{
 358             .name = "value",
 359             .type = QEMU_OPT_STRING,
 360         },
 361         { /* end of list */ }
 362     },
 363 };
 364
 365 QemuOptsList qemu_sandbox_opts = {
 366     .name = "sandbox",
 367     .implied_opt_name = "enable",
 368     .head = QTAILQ_HEAD_INITIALIZER(qemu_sandbox_opts.head),
 369     .desc = {
 370         {
 371             .name = "enable",
 372             .type = QEMU_OPT_BOOL,
 373         },
 374         { /* end of list */ }
 375     },
 376 };
 377
 378 static QemuOptsList qemu_mon_opts = {
 379     .name = "mon",
 380     .implied_opt_name = "chardev",
 381     .head = QTAILQ_HEAD_INITIALIZER(qemu_mon_opts.head),
 382     .desc = {
 383         {
 384             .name = "mode",
 385             .type = QEMU_OPT_STRING,
 386         },{
 387             .name = "chardev",
 388             .type = QEMU_OPT_STRING,
 389         },{
 390             .name = "default",
 391             .type = QEMU_OPT_BOOL,
 392         },{
 393             .name = "pretty",
 394             .type = QEMU_OPT_BOOL,
 395         },
 396         { /* end of list */ }
 397     },
 398 };
 399
 400 static QemuOptsList qemu_trace_opts = {
 401     .name = "trace",
 402     .implied_opt_name = "trace",
 403     .head = QTAILQ_HEAD_INITIALIZER(qemu_trace_opts.head),
 404     .desc = {
 405         {
 406             .name = "events",
 407             .type = QEMU_OPT_STRING,
 408         },{
 409             .name = "file",
 410             .type = QEMU_OPT_STRING,
 411         },
 412         { /* end of list */ }
 413     },
 414 };
 415
 416 static QemuOptsList qemu_cpudef_opts = {
 417     .name = "cpudef",
 418     .head = QTAILQ_HEAD_INITIALIZER(qemu_cpudef_opts.head),
 419     .desc = {
 420         {
 421             .name = "name",
 422             .type = QEMU_OPT_STRING,
 423         },{
 424             .name = "level",
 425             .type = QEMU_OPT_NUMBER,
 426         },{
 427             .name = "vendor",
 428             .type = QEMU_OPT_STRING,
 429         },{
 430             .name = "family",
 431             .type = QEMU_OPT_NUMBER,
 432         },{
 433             .name = "model",
 434             .type = QEMU_OPT_NUMBER,
 435         },{
 436             .name = "stepping",
 437             .type = QEMU_OPT_NUMBER,
 438         },{
 439             .name = "feature_edx",      /* cpuid 0000_0001.edx */
 440             .type = QEMU_OPT_STRING,
 441         },{
 442             .name = "feature_ecx",      /* cpuid 0000_0001.ecx */
 443             .type = QEMU_OPT_STRING,
 444         },{
 445             .name = "extfeature_edx",   /* cpuid 8000_0001.edx */
 446             .type = QEMU_OPT_STRING,
 447         },{
 448             .name = "extfeature_ecx",   /* cpuid 8000_0001.ecx */
 449             .type = QEMU_OPT_STRING,
 450         },{
 451             .name = "xlevel",
 452             .type = QEMU_OPT_NUMBER,
 453         },{
 454             .name = "model_id",
 455             .type = QEMU_OPT_STRING,
 456         },{
 457             .name = "vendor_override",
 458             .type = QEMU_OPT_NUMBER,
 459         },
 460         { /* end of list */ }
 461     },
 462 };
 463
 464 QemuOptsList qemu_spice_opts = {
 465     .name = "spice",
 466     .head = QTAILQ_HEAD_INITIALIZER(qemu_spice_opts.head),
 467     .desc = {
 468         {
 469             .name = "port",
 470             .type = QEMU_OPT_NUMBER,
 471         },{
 472             .name = "tls-port",
 473             .type = QEMU_OPT_NUMBER,
 474         },{
 475             .name = "addr",
 476             .type = QEMU_OPT_STRING,
 477         },{
 478             .name = "ipv4",
 479             .type = QEMU_OPT_BOOL,
 480         },{
 481             .name = "ipv6",
 482             .type = QEMU_OPT_BOOL,
 483         },{
 484             .name = "password",
 485             .type = QEMU_OPT_STRING,
 486         },{
 487             .name = "disable-ticketing",
 488             .type = QEMU_OPT_BOOL,
 489         },{
 490             .name = "disable-copy-paste",
 491             .type = QEMU_OPT_BOOL,
 492         },{
 493             .name = "sasl",
 494             .type = QEMU_OPT_BOOL,
 495         },{
 496             .name = "x509-dir",
 497             .type = QEMU_OPT_STRING,
 498         },{
 499             .name = "x509-key-file",
 500             .type = QEMU_OPT_STRING,
 501         },{
 502             .name = "x509-key-password",
 503             .type = QEMU_OPT_STRING,
 504         },{
 505             .name = "x509-cert-file",
 506             .type = QEMU_OPT_STRING,
 507         },{
 508             .name = "x509-cacert-file",
 509             .type = QEMU_OPT_STRING,
 510         },{
 511             .name = "x509-dh-key-file",
 512             .type = QEMU_OPT_STRING,
 513         },{
 514             .name = "tls-ciphers",
 515             .type = QEMU_OPT_STRING,
 516         },{
 517             .name = "tls-channel",
 518             .type = QEMU_OPT_STRING,
 519         },{
 520             .name = "plaintext-channel",
 521             .type = QEMU_OPT_STRING,
 522         },{
 523             .name = "image-compression",
 524             .type = QEMU_OPT_STRING,
 525         },{
 526             .name = "jpeg-wan-compression",
 527             .type = QEMU_OPT_STRING,
 528         },{
 529             .name = "zlib-glz-wan-compression",
 530             .type = QEMU_OPT_STRING,
 531         },{
 532             .name = "streaming-video",
 533             .type = QEMU_OPT_STRING,
 534         },{
 535             .name = "agent-mouse",
 536             .type = QEMU_OPT_BOOL,
 537         },{
 538             .name = "playback-compression",
 539             .type = QEMU_OPT_BOOL,
 540         }, {
 541             .name = "seamless-migration",
 542             .type = QEMU_OPT_BOOL,
 543         },
 544         { /* end of list */ }
 545     },
 546 };
 547
 548 QemuOptsList qemu_option_rom_opts = {
 549     .name = "option-rom",
 550     .implied_opt_name = "romfile",
 551     .head = QTAILQ_HEAD_INITIALIZER(qemu_option_rom_opts.head),
 552     .desc = {
 553         {
 554             .name = "bootindex",
 555             .type = QEMU_OPT_NUMBER,
 556         }, {
 557             .name = "romfile",
 558             .type = QEMU_OPT_STRING,
 559         },
 560         { /* end of list */ }
 561     },
 562 };
 563
 564 static QemuOptsList qemu_machine_opts = {
 565     .name = "machine",
 566     .implied_opt_name = "type",
 567     .merge_lists = true,
 568     .head = QTAILQ_HEAD_INITIALIZER(qemu_machine_opts.head),
 569     .desc = {
 570         {
 571             .name = "type",
 572             .type = QEMU_OPT_STRING,
 573             .help = "emulated machine"
 574         }, {
 575             .name = "accel",
 576             .type = QEMU_OPT_STRING,
 577             .help = "accelerator list",
 578         }, {
 579             .name = "kernel_irqchip",
 580             .type = QEMU_OPT_BOOL,
 581             .help = "use KVM in-kernel irqchip",
 582         }, {
 583             .name = "kvm_shadow_mem",
 584             .type = QEMU_OPT_SIZE,
 585             .help = "KVM shadow MMU size",
 586         }, {
 587             .name = "kernel",
 588             .type = QEMU_OPT_STRING,
 589             .help = "Linux kernel image file",
 590         }, {
 591             .name = "initrd",
 592             .type = QEMU_OPT_STRING,
 593             .help = "Linux initial ramdisk file",
 594         }, {
 595             .name = "append",
 596             .type = QEMU_OPT_STRING,
 597             .help = "Linux kernel command line",
 598         }, {
 599             .name = "dtb",
 600             .type = QEMU_OPT_STRING,
 601             .help = "Linux kernel device tree file",
 602         }, {
 603             .name = "dumpdtb",
 604             .type = QEMU_OPT_STRING,
 605             .help = "Dump current dtb to a file and quit",
 606         }, {
 607             .name = "phandle_start",
 608             .type = QEMU_OPT_STRING,
 609             .help = "The first phandle ID we may generate dynamically",
 610         }, {
 611             .name = "dt_compatible",
 612             .type = QEMU_OPT_STRING,
 613             .help = "Overrides the \"compatible\" property of the dt root node",
 614         }, {
 615             .name = "dump-guest-core",
 616             .type = QEMU_OPT_BOOL,
 617             .help = "Include guest memory in  a core dump",
 618         }, {
 619             .name = "mem-merge",
 620             .type = QEMU_OPT_BOOL,
 621             .help = "enable/disable memory merge support",
 622         },
 623         { /* End of list */ }
 624     },
 625 };
 626
 627 QemuOptsList qemu_boot_opts = {
 628     .name = "boot-opts",
 629     .head = QTAILQ_HEAD_INITIALIZER(qemu_boot_opts.head),
 630     .desc = {
 631         /* the three names below are not used now */
 632         {
 633             .name = "order",
 634             .type = QEMU_OPT_STRING,
 635         }, {
 636             .name = "once",
 637             .type = QEMU_OPT_STRING,
 638         }, {
 639             .name = "menu",
 640             .type = QEMU_OPT_STRING,
 641         /* following are really used */
 642         }, {
 643             .name = "splash",
 644             .type = QEMU_OPT_STRING,
 645         }, {
 646             .name = "splash-time",
 647             .type = QEMU_OPT_STRING,
 648         }, {
 649             .name = "reboot-timeout",
 650             .type = QEMU_OPT_STRING,
 651         },
 652         { /*End of list */ }
 653     },
 654 };
 655
 656 static QemuOptsList *vm_config_groups[32] = {
 657     &qemu_drive_opts,
 658     &qemu_chardev_opts,
 659     &qemu_device_opts,
 660     &qemu_netdev_opts,
 661     &qemu_net_opts,
 662     &qemu_rtc_opts,
 663     &qemu_global_opts,
 664     &qemu_mon_opts,
 665     &qemu_cpudef_opts,
 666     &qemu_trace_opts,
 667     &qemu_option_rom_opts,
 668     &qemu_machine_opts,
 669     &qemu_boot_opts,
 670     &qemu_iscsi_opts,
 671     &qemu_sandbox_opts,
 672     NULL,
 673 };
 674
 675 static QemuOptsList *find_list(QemuOptsList **lists, const char *group,
 676                                Error **errp)
 677 {
 678     int i;
 679
 680     for (i = 0; lists[i] != NULL; i++) {
 681         if (strcmp(lists[i]->name, group) == 0)
 682             break;
 683     }
 684     if (lists[i] == NULL) {
 685         error_set(errp, QERR_INVALID_OPTION_GROUP, group);
 686     }
 687     return lists[i];
 688 }
 689
 690 QemuOptsList *qemu_find_opts(const char *group)
 691 {
 692     QemuOptsList *ret;
 693     Error *local_err = NULL;
 694
 695     ret = find_list(vm_config_groups, group, &local_err);
 696     if (error_is_set(&local_err)) {
 697         error_report("%s\n", error_get_pretty(local_err));
 698         error_free(local_err);
 699     }
 700
 701     return ret;
 702 }
 703
 704 QemuOptsList *qemu_find_opts_err(const char *group, Error **errp)
 705 {
 706     return find_list(vm_config_groups, group, errp);
 707 }
 708
 709 void qemu_add_opts(QemuOptsList *list)
 710 {
 711     int entries, i;
 712
 713     entries = ARRAY_SIZE(vm_config_groups);
 714     entries--; /* keep list NULL terminated */
 715     for (i = 0; i < entries; i++) {
 716         if (vm_config_groups[i] == NULL) {
 717             vm_config_groups[i] = list;
 718             return;
 719         }
 720     }
 721     fprintf(stderr, "ran out of space in vm_config_groups");
 722     abort();
 723 }
 724
 725 int qemu_set_option(const char *str)
 726 {
 727     char group[64], id[64], arg[64];
 728     QemuOptsList *list;
 729     QemuOpts *opts;
 730     int rc, offset;
 731
 732     rc = sscanf(str, "%63[^.].%63[^.].%63[^=]%n", group, id, arg, &offset);
 733     if (rc < 3 || str[offset] != '=') {
 734         error_report("can't parse: \"%s\"", str);
 735         return -1;
 736     }
 737
 738     list = qemu_find_opts(group);
 739     if (list == NULL) {
 740         return -1;
 741     }
 742
 743     opts = qemu_opts_find(list, id);
 744     if (!opts) {
 745         error_report("there is no %s \"%s\" defined",
 746                      list->name, id);
 747         return -1;
 748     }
 749
 750     if (qemu_opt_set(opts, arg, str+offset+1) == -1) {
 751         return -1;
 752     }
 753     return 0;
 754 }
 755
 756 int qemu_global_option(const char *str)
 757 {
 758     char driver[64], property[64];
 759     QemuOpts *opts;
 760     int rc, offset;
 761
 762     rc = sscanf(str, "%63[^.].%63[^=]%n", driver, property, &offset);
 763     if (rc < 2 || str[offset] != '=') {
 764         error_report("can't parse: \"%s\"", str);
 765         return -1;
 766     }
 767
 768     opts = qemu_opts_create(&qemu_global_opts, NULL, 0, NULL);
 769     qemu_opt_set(opts, "driver", driver);
 770     qemu_opt_set(opts, "property", property);
 771     qemu_opt_set(opts, "value", str+offset+1);
 772     return 0;
 773 }
 774
 775 struct ConfigWriteData {
 776     QemuOptsList *list;
 777     FILE *fp;
 778 };
 779
 780 static int config_write_opt(const char *name, const char *value, void *opaque)
 781 {
 782     struct ConfigWriteData *data = opaque;
 783
 784     fprintf(data->fp, "  %s = \"%s\"\n", name, value);
 785     return 0;
 786 }
 787
 788 static int config_write_opts(QemuOpts *opts, void *opaque)
 789 {
 790     struct ConfigWriteData *data = opaque;
 791     const char *id = qemu_opts_id(opts);
 792
 793     if (id) {
 794         fprintf(data->fp, "[%s \"%s\"]\n", data->list->name, id);
 795     } else {
 796         fprintf(data->fp, "[%s]\n", data->list->name);
 797     }
 798     qemu_opt_foreach(opts, config_write_opt, data, 0);
 799     fprintf(data->fp, "\n");
 800     return 0;
 801 }
 802
 803 void qemu_config_write(FILE *fp)
 804 {
 805     struct ConfigWriteData data = { .fp = fp };
 806     QemuOptsList **lists = vm_config_groups;
 807     int i;
 808
 809     fprintf(fp, "# qemu config file\n\n");
 810     for (i = 0; lists[i] != NULL; i++) {
 811         data.list = lists[i];
 812         qemu_opts_foreach(data.list, config_write_opts, &data, 0);
 813     }
 814 }
 815
 816 int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
 817 {
 818     char line[1024], group[64], id[64], arg[64], value[1024];
 819     Location loc;
 820     QemuOptsList *list = NULL;
 821     Error *local_err = NULL;
 822     QemuOpts *opts = NULL;
 823     int res = -1, lno = 0;
 824
 825     loc_push_none(&loc);
 826     while (fgets(line, sizeof(line), fp) != NULL) {
 827         loc_set_file(fname, ++lno);
 828         if (line[0] == '\n') {
 829             /* skip empty lines */
 830             continue;
 831         }
 832         if (line[0] == '#') {
 833             /* comment */
 834             continue;
 835         }
 836         if (sscanf(line, "[%63s \"%63[^\"]\"]", group, id) == 2) {
 837             /* group with id */
 838             list = find_list(lists, group, &local_err);
 839             if (error_is_set(&local_err)) {
 840                 error_report("%s\n", error_get_pretty(local_err));
 841                 error_free(local_err);
 842                 goto out;
 843             }
 844             opts = qemu_opts_create(list, id, 1, NULL);
 845             continue;
 846         }
 847         if (sscanf(line, "[%63[^]]]", group) == 1) {
 848             /* group without id */
 849             list = find_list(lists, group, &local_err);
 850             if (error_is_set(&local_err)) {
 851                 error_report("%s\n", error_get_pretty(local_err));
 852                 error_free(local_err);
 853                 goto out;
 854             }
 855             opts = qemu_opts_create(list, NULL, 0, NULL);
 856             continue;
 857         }
 858         if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2) {
 859             /* arg = value */
 860             if (opts == NULL) {
 861                 error_report("no group defined");
 862                 goto out;
 863             }
 864             if (qemu_opt_set(opts, arg, value) != 0) {
 865                 goto out;
 866             }
 867             continue;
 868         }
 869         error_report("parse error");
 870         goto out;
 871     }
 872     if (ferror(fp)) {
 873         error_report("error reading file");
 874         goto out;
 875     }
 876     res = 0;
 877 out:
 878     loc_pop(&loc);
 879     return res;
 880 }
 881
 882 int qemu_read_config_file(const char *filename)
 883 {
 884     FILE *f = fopen(filename, "r");
 885     int ret;
 886
 887     if (f == NULL) {
 888         return -errno;
 889     }
 890
 891     ret = qemu_config_parse(f, vm_config_groups, filename);
 892     fclose(f);
 893
 894     if (ret == 0) {
 895         return 0;
 896     } else {
 897         return -EINVAL;
 898     }
 899 }