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 static QemuOptsList qemu_mon_opts = {
 366     .name = "mon",
 367     .implied_opt_name = "chardev",
 368     .head = QTAILQ_HEAD_INITIALIZER(qemu_mon_opts.head),
 369     .desc = {
 370         {
 371             .name = "mode",
 372             .type = QEMU_OPT_STRING,
 373         },{
 374             .name = "chardev",
 375             .type = QEMU_OPT_STRING,
 376         },{
 377             .name = "default",
 378             .type = QEMU_OPT_BOOL,
 379         },{
 380             .name = "pretty",
 381             .type = QEMU_OPT_BOOL,
 382         },
 383         { /* end of list */ }
 384     },
 385 };
 386
 387 static QemuOptsList qemu_trace_opts = {
 388     .name = "trace",
 389     .implied_opt_name = "trace",
 390     .head = QTAILQ_HEAD_INITIALIZER(qemu_trace_opts.head),
 391     .desc = {
 392         {
 393             .name = "events",
 394             .type = QEMU_OPT_STRING,
 395         },{
 396             .name = "file",
 397             .type = QEMU_OPT_STRING,
 398         },
 399         { /* end of list */ }
 400     },
 401 };
 402
 403 static QemuOptsList qemu_cpudef_opts = {
 404     .name = "cpudef",
 405     .head = QTAILQ_HEAD_INITIALIZER(qemu_cpudef_opts.head),
 406     .desc = {
 407         {
 408             .name = "name",
 409             .type = QEMU_OPT_STRING,
 410         },{
 411             .name = "level",
 412             .type = QEMU_OPT_NUMBER,
 413         },{
 414             .name = "vendor",
 415             .type = QEMU_OPT_STRING,
 416         },{
 417             .name = "family",
 418             .type = QEMU_OPT_NUMBER,
 419         },{
 420             .name = "model",
 421             .type = QEMU_OPT_NUMBER,
 422         },{
 423             .name = "stepping",
 424             .type = QEMU_OPT_NUMBER,
 425         },{
 426             .name = "feature_edx",      /* cpuid 0000_0001.edx */
 427             .type = QEMU_OPT_STRING,
 428         },{
 429             .name = "feature_ecx",      /* cpuid 0000_0001.ecx */
 430             .type = QEMU_OPT_STRING,
 431         },{
 432             .name = "extfeature_edx",   /* cpuid 8000_0001.edx */
 433             .type = QEMU_OPT_STRING,
 434         },{
 435             .name = "extfeature_ecx",   /* cpuid 8000_0001.ecx */
 436             .type = QEMU_OPT_STRING,
 437         },{
 438             .name = "xlevel",
 439             .type = QEMU_OPT_NUMBER,
 440         },{
 441             .name = "model_id",
 442             .type = QEMU_OPT_STRING,
 443         },{
 444             .name = "vendor_override",
 445             .type = QEMU_OPT_NUMBER,
 446         },
 447         { /* end of list */ }
 448     },
 449 };
 450
 451 QemuOptsList qemu_spice_opts = {
 452     .name = "spice",
 453     .head = QTAILQ_HEAD_INITIALIZER(qemu_spice_opts.head),
 454     .desc = {
 455         {
 456             .name = "port",
 457             .type = QEMU_OPT_NUMBER,
 458         },{
 459             .name = "tls-port",
 460             .type = QEMU_OPT_NUMBER,
 461         },{
 462             .name = "addr",
 463             .type = QEMU_OPT_STRING,
 464         },{
 465             .name = "ipv4",
 466             .type = QEMU_OPT_BOOL,
 467         },{
 468             .name = "ipv6",
 469             .type = QEMU_OPT_BOOL,
 470         },{
 471             .name = "password",
 472             .type = QEMU_OPT_STRING,
 473         },{
 474             .name = "disable-ticketing",
 475             .type = QEMU_OPT_BOOL,
 476         },{
 477             .name = "disable-copy-paste",
 478             .type = QEMU_OPT_BOOL,
 479         },{
 480             .name = "sasl",
 481             .type = QEMU_OPT_BOOL,
 482         },{
 483             .name = "x509-dir",
 484             .type = QEMU_OPT_STRING,
 485         },{
 486             .name = "x509-key-file",
 487             .type = QEMU_OPT_STRING,
 488         },{
 489             .name = "x509-key-password",
 490             .type = QEMU_OPT_STRING,
 491         },{
 492             .name = "x509-cert-file",
 493             .type = QEMU_OPT_STRING,
 494         },{
 495             .name = "x509-cacert-file",
 496             .type = QEMU_OPT_STRING,
 497         },{
 498             .name = "x509-dh-key-file",
 499             .type = QEMU_OPT_STRING,
 500         },{
 501             .name = "tls-ciphers",
 502             .type = QEMU_OPT_STRING,
 503         },{
 504             .name = "tls-channel",
 505             .type = QEMU_OPT_STRING,
 506         },{
 507             .name = "plaintext-channel",
 508             .type = QEMU_OPT_STRING,
 509         },{
 510             .name = "image-compression",
 511             .type = QEMU_OPT_STRING,
 512         },{
 513             .name = "jpeg-wan-compression",
 514             .type = QEMU_OPT_STRING,
 515         },{
 516             .name = "zlib-glz-wan-compression",
 517             .type = QEMU_OPT_STRING,
 518         },{
 519             .name = "streaming-video",
 520             .type = QEMU_OPT_STRING,
 521         },{
 522             .name = "agent-mouse",
 523             .type = QEMU_OPT_BOOL,
 524         },{
 525             .name = "playback-compression",
 526             .type = QEMU_OPT_BOOL,
 527         },
 528         { /* end of list */ }
 529     },
 530 };
 531
 532 QemuOptsList qemu_option_rom_opts = {
 533     .name = "option-rom",
 534     .implied_opt_name = "romfile",
 535     .head = QTAILQ_HEAD_INITIALIZER(qemu_option_rom_opts.head),
 536     .desc = {
 537         {
 538             .name = "bootindex",
 539             .type = QEMU_OPT_NUMBER,
 540         }, {
 541             .name = "romfile",
 542             .type = QEMU_OPT_STRING,
 543         },
 544         { /* end of list */ }
 545     },
 546 };
 547
 548 static QemuOptsList qemu_machine_opts = {
 549     .name = "machine",
 550     .implied_opt_name = "type",
 551     .merge_lists = true,
 552     .head = QTAILQ_HEAD_INITIALIZER(qemu_machine_opts.head),
 553     .desc = {
 554         {
 555             .name = "type",
 556             .type = QEMU_OPT_STRING,
 557             .help = "emulated machine"
 558         }, {
 559             .name = "accel",
 560             .type = QEMU_OPT_STRING,
 561             .help = "accelerator list",
 562         }, {
 563             .name = "kernel_irqchip",
 564             .type = QEMU_OPT_BOOL,
 565             .help = "use KVM in-kernel irqchip",
 566         }, {
 567             .name = "kvm_shadow_mem",
 568             .type = QEMU_OPT_SIZE,
 569             .help = "KVM shadow MMU size",
 570         }, {
 571             .name = "kernel",
 572             .type = QEMU_OPT_STRING,
 573             .help = "Linux kernel image file",
 574         }, {
 575             .name = "initrd",
 576             .type = QEMU_OPT_STRING,
 577             .help = "Linux initial ramdisk file",
 578         }, {
 579             .name = "append",
 580             .type = QEMU_OPT_STRING,
 581             .help = "Linux kernel command line",
 582         }, {
 583             .name = "dtb",
 584             .type = QEMU_OPT_STRING,
 585             .help = "Linux kernel device tree file",
 586         }, {
 587             .name = "dumpdtb",
 588             .type = QEMU_OPT_STRING,
 589             .help = "Dump current dtb to a file and quit",
 590         }, {
 591             .name = "phandle_start",
 592             .type = QEMU_OPT_STRING,
 593             .help = "The first phandle ID we may generate dynamically",
 594         }, {
 595             .name = "dt_compatible",
 596             .type = QEMU_OPT_STRING,
 597             .help = "Overrides the \"compatible\" property of the dt root node",
 598         },
 599         { /* End of list */ }
 600     },
 601 };
 602
 603 QemuOptsList qemu_boot_opts = {
 604     .name = "boot-opts",
 605     .head = QTAILQ_HEAD_INITIALIZER(qemu_boot_opts.head),
 606     .desc = {
 607         /* the three names below are not used now */
 608         {
 609             .name = "order",
 610             .type = QEMU_OPT_STRING,
 611         }, {
 612             .name = "once",
 613             .type = QEMU_OPT_STRING,
 614         }, {
 615             .name = "menu",
 616             .type = QEMU_OPT_STRING,
 617         /* following are really used */
 618         }, {
 619             .name = "splash",
 620             .type = QEMU_OPT_STRING,
 621         }, {
 622             .name = "splash-time",
 623             .type = QEMU_OPT_STRING,
 624         },
 625         { /*End of list */ }
 626     },
 627 };
 628
 629 static QemuOptsList *vm_config_groups[32] = {
 630     &qemu_drive_opts,
 631     &qemu_chardev_opts,
 632     &qemu_device_opts,
 633     &qemu_netdev_opts,
 634     &qemu_net_opts,
 635     &qemu_rtc_opts,
 636     &qemu_global_opts,
 637     &qemu_mon_opts,
 638     &qemu_cpudef_opts,
 639     &qemu_trace_opts,
 640     &qemu_option_rom_opts,
 641     &qemu_machine_opts,
 642     &qemu_boot_opts,
 643     &qemu_iscsi_opts,
 644     NULL,
 645 };
 646
 647 static QemuOptsList *find_list(QemuOptsList **lists, const char *group,
 648                                Error **errp)
 649 {
 650     int i;
 651
 652     for (i = 0; lists[i] != NULL; i++) {
 653         if (strcmp(lists[i]->name, group) == 0)
 654             break;
 655     }
 656     if (lists[i] == NULL) {
 657         error_set(errp, QERR_INVALID_OPTION_GROUP, group);
 658     }
 659     return lists[i];
 660 }
 661
 662 QemuOptsList *qemu_find_opts(const char *group)
 663 {
 664     QemuOptsList *ret;
 665     Error *local_err = NULL;
 666
 667     ret = find_list(vm_config_groups, group, &local_err);
 668     if (error_is_set(&local_err)) {
 669         error_report("%s\n", error_get_pretty(local_err));
 670         error_free(local_err);
 671     }
 672
 673     return ret;
 674 }
 675
 676 QemuOptsList *qemu_find_opts_err(const char *group, Error **errp)
 677 {
 678     return find_list(vm_config_groups, group, errp);
 679 }
 680
 681 void qemu_add_opts(QemuOptsList *list)
 682 {
 683     int entries, i;
 684
 685     entries = ARRAY_SIZE(vm_config_groups);
 686     entries--; /* keep list NULL terminated */
 687     for (i = 0; i < entries; i++) {
 688         if (vm_config_groups[i] == NULL) {
 689             vm_config_groups[i] = list;
 690             return;
 691         }
 692     }
 693     fprintf(stderr, "ran out of space in vm_config_groups");
 694     abort();
 695 }
 696
 697 int qemu_set_option(const char *str)
 698 {
 699     char group[64], id[64], arg[64];
 700     QemuOptsList *list;
 701     QemuOpts *opts;
 702     int rc, offset;
 703
 704     rc = sscanf(str, "%63[^.].%63[^.].%63[^=]%n", group, id, arg, &offset);
 705     if (rc < 3 || str[offset] != '=') {
 706         error_report("can't parse: \"%s\"", str);
 707         return -1;
 708     }
 709
 710     list = qemu_find_opts(group);
 711     if (list == NULL) {
 712         return -1;
 713     }
 714
 715     opts = qemu_opts_find(list, id);
 716     if (!opts) {
 717         error_report("there is no %s \"%s\" defined",
 718                      list->name, id);
 719         return -1;
 720     }
 721
 722     if (qemu_opt_set(opts, arg, str+offset+1) == -1) {
 723         return -1;
 724     }
 725     return 0;
 726 }
 727
 728 int qemu_global_option(const char *str)
 729 {
 730     char driver[64], property[64];
 731     QemuOpts *opts;
 732     int rc, offset;
 733
 734     rc = sscanf(str, "%63[^.].%63[^=]%n", driver, property, &offset);
 735     if (rc < 2 || str[offset] != '=') {
 736         error_report("can't parse: \"%s\"", str);
 737         return -1;
 738     }
 739
 740     opts = qemu_opts_create(&qemu_global_opts, NULL, 0, NULL);
 741     qemu_opt_set(opts, "driver", driver);
 742     qemu_opt_set(opts, "property", property);
 743     qemu_opt_set(opts, "value", str+offset+1);
 744     return 0;
 745 }
 746
 747 struct ConfigWriteData {
 748     QemuOptsList *list;
 749     FILE *fp;
 750 };
 751
 752 static int config_write_opt(const char *name, const char *value, void *opaque)
 753 {
 754     struct ConfigWriteData *data = opaque;
 755
 756     fprintf(data->fp, "  %s = \"%s\"\n", name, value);
 757     return 0;
 758 }
 759
 760 static int config_write_opts(QemuOpts *opts, void *opaque)
 761 {
 762     struct ConfigWriteData *data = opaque;
 763     const char *id = qemu_opts_id(opts);
 764
 765     if (id) {
 766         fprintf(data->fp, "[%s \"%s\"]\n", data->list->name, id);
 767     } else {
 768         fprintf(data->fp, "[%s]\n", data->list->name);
 769     }
 770     qemu_opt_foreach(opts, config_write_opt, data, 0);
 771     fprintf(data->fp, "\n");
 772     return 0;
 773 }
 774
 775 void qemu_config_write(FILE *fp)
 776 {
 777     struct ConfigWriteData data = { .fp = fp };
 778     QemuOptsList **lists = vm_config_groups;
 779     int i;
 780
 781     fprintf(fp, "# qemu config file\n\n");
 782     for (i = 0; lists[i] != NULL; i++) {
 783         data.list = lists[i];
 784         qemu_opts_foreach(data.list, config_write_opts, &data, 0);
 785     }
 786 }
 787
 788 int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
 789 {
 790     char line[1024], group[64], id[64], arg[64], value[1024];
 791     Location loc;
 792     QemuOptsList *list = NULL;
 793     Error *local_err = NULL;
 794     QemuOpts *opts = NULL;
 795     int res = -1, lno = 0;
 796
 797     loc_push_none(&loc);
 798     while (fgets(line, sizeof(line), fp) != NULL) {
 799         loc_set_file(fname, ++lno);
 800         if (line[0] == '\n') {
 801             /* skip empty lines */
 802             continue;
 803         }
 804         if (line[0] == '#') {
 805             /* comment */
 806             continue;
 807         }
 808         if (sscanf(line, "[%63s \"%63[^\"]\"]", group, id) == 2) {
 809             /* group with id */
 810             list = find_list(lists, group, &local_err);
 811             if (error_is_set(&local_err)) {
 812                 error_report("%s\n", error_get_pretty(local_err));
 813                 error_free(local_err);
 814                 goto out;
 815             }
 816             opts = qemu_opts_create(list, id, 1, NULL);
 817             continue;
 818         }
 819         if (sscanf(line, "[%63[^]]]", group) == 1) {
 820             /* group without id */
 821             list = find_list(lists, group, &local_err);
 822             if (error_is_set(&local_err)) {
 823                 error_report("%s\n", error_get_pretty(local_err));
 824                 error_free(local_err);
 825                 goto out;
 826             }
 827             opts = qemu_opts_create(list, NULL, 0, NULL);
 828             continue;
 829         }
 830         if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2) {
 831             /* arg = value */
 832             if (opts == NULL) {
 833                 error_report("no group defined");
 834                 goto out;
 835             }
 836             if (qemu_opt_set(opts, arg, value) != 0) {
 837                 goto out;
 838             }
 839             continue;
 840         }
 841         error_report("parse error");
 842         goto out;
 843     }
 844     if (ferror(fp)) {
 845         error_report("error reading file");
 846         goto out;
 847     }
 848     res = 0;
 849 out:
 850     loc_pop(&loc);
 851     return res;
 852 }
 853
 854 int qemu_read_config_file(const char *filename)
 855 {
 856     FILE *f = fopen(filename, "r");
 857     int ret;
 858
 859     if (f == NULL) {
 860         return -errno;
 861     }
 862
 863     ret = qemu_config_parse(f, vm_config_groups, filename);
 864     fclose(f);
 865
 866     if (ret == 0) {
 867         return 0;
 868     } else {
 869         return -EINVAL;
 870     }
 871 }