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             .name = "usb",
 624             .type = QEMU_OPT_BOOL,
 625             .help = "Set on/off to enable/disable usb",
 626         },
 627         { /* End of list */ }
 628     },
 629 };
 630
 631 QemuOptsList qemu_boot_opts = {
 632     .name = "boot-opts",
 633     .head = QTAILQ_HEAD_INITIALIZER(qemu_boot_opts.head),
 634     .desc = {
 635         /* the three names below are not used now */
 636         {
 637             .name = "order",
 638             .type = QEMU_OPT_STRING,
 639         }, {
 640             .name = "once",
 641             .type = QEMU_OPT_STRING,
 642         }, {
 643             .name = "menu",
 644             .type = QEMU_OPT_STRING,
 645         /* following are really used */
 646         }, {
 647             .name = "splash",
 648             .type = QEMU_OPT_STRING,
 649         }, {
 650             .name = "splash-time",
 651             .type = QEMU_OPT_STRING,
 652         }, {
 653             .name = "reboot-timeout",
 654             .type = QEMU_OPT_STRING,
 655         },
 656         { /*End of list */ }
 657     },
 658 };
 659
 660 static QemuOptsList qemu_add_fd_opts = {
 661     .name = "add-fd",
 662     .head = QTAILQ_HEAD_INITIALIZER(qemu_add_fd_opts.head),
 663     .desc = {
 664         {
 665             .name = "fd",
 666             .type = QEMU_OPT_NUMBER,
 667             .help = "file descriptor of which a duplicate is added to fd set",
 668         },{
 669             .name = "set",
 670             .type = QEMU_OPT_NUMBER,
 671             .help = "ID of the fd set to add fd to",
 672         },{
 673             .name = "opaque",
 674             .type = QEMU_OPT_STRING,
 675             .help = "free-form string used to describe fd",
 676         },
 677         { /* end of list */ }
 678     },
 679 };
 680
 681 static QemuOptsList *vm_config_groups[32] = {
 682     &qemu_drive_opts,
 683     &qemu_chardev_opts,
 684     &qemu_device_opts,
 685     &qemu_netdev_opts,
 686     &qemu_net_opts,
 687     &qemu_rtc_opts,
 688     &qemu_global_opts,
 689     &qemu_mon_opts,
 690     &qemu_cpudef_opts,
 691     &qemu_trace_opts,
 692     &qemu_option_rom_opts,
 693     &qemu_machine_opts,
 694     &qemu_boot_opts,
 695     &qemu_iscsi_opts,
 696     &qemu_sandbox_opts,
 697     &qemu_add_fd_opts,
 698     NULL,
 699 };
 700
 701 static QemuOptsList *find_list(QemuOptsList **lists, const char *group,
 702                                Error **errp)
 703 {
 704     int i;
 705
 706     for (i = 0; lists[i] != NULL; i++) {
 707         if (strcmp(lists[i]->name, group) == 0)
 708             break;
 709     }
 710     if (lists[i] == NULL) {
 711         error_set(errp, QERR_INVALID_OPTION_GROUP, group);
 712     }
 713     return lists[i];
 714 }
 715
 716 QemuOptsList *qemu_find_opts(const char *group)
 717 {
 718     QemuOptsList *ret;
 719     Error *local_err = NULL;
 720
 721     ret = find_list(vm_config_groups, group, &local_err);
 722     if (error_is_set(&local_err)) {
 723         error_report("%s\n", error_get_pretty(local_err));
 724         error_free(local_err);
 725     }
 726
 727     return ret;
 728 }
 729
 730 QemuOptsList *qemu_find_opts_err(const char *group, Error **errp)
 731 {
 732     return find_list(vm_config_groups, group, errp);
 733 }
 734
 735 void qemu_add_opts(QemuOptsList *list)
 736 {
 737     int entries, i;
 738
 739     entries = ARRAY_SIZE(vm_config_groups);
 740     entries--; /* keep list NULL terminated */
 741     for (i = 0; i < entries; i++) {
 742         if (vm_config_groups[i] == NULL) {
 743             vm_config_groups[i] = list;
 744             return;
 745         }
 746     }
 747     fprintf(stderr, "ran out of space in vm_config_groups");
 748     abort();
 749 }
 750
 751 int qemu_set_option(const char *str)
 752 {
 753     char group[64], id[64], arg[64];
 754     QemuOptsList *list;
 755     QemuOpts *opts;
 756     int rc, offset;
 757
 758     rc = sscanf(str, "%63[^.].%63[^.].%63[^=]%n", group, id, arg, &offset);
 759     if (rc < 3 || str[offset] != '=') {
 760         error_report("can't parse: \"%s\"", str);
 761         return -1;
 762     }
 763
 764     list = qemu_find_opts(group);
 765     if (list == NULL) {
 766         return -1;
 767     }
 768
 769     opts = qemu_opts_find(list, id);
 770     if (!opts) {
 771         error_report("there is no %s \"%s\" defined",
 772                      list->name, id);
 773         return -1;
 774     }
 775
 776     if (qemu_opt_set(opts, arg, str+offset+1) == -1) {
 777         return -1;
 778     }
 779     return 0;
 780 }
 781
 782 int qemu_global_option(const char *str)
 783 {
 784     char driver[64], property[64];
 785     QemuOpts *opts;
 786     int rc, offset;
 787
 788     rc = sscanf(str, "%63[^.].%63[^=]%n", driver, property, &offset);
 789     if (rc < 2 || str[offset] != '=') {
 790         error_report("can't parse: \"%s\"", str);
 791         return -1;
 792     }
 793
 794     opts = qemu_opts_create(&qemu_global_opts, NULL, 0, NULL);
 795     qemu_opt_set(opts, "driver", driver);
 796     qemu_opt_set(opts, "property", property);
 797     qemu_opt_set(opts, "value", str+offset+1);
 798     return 0;
 799 }
 800
 801 struct ConfigWriteData {
 802     QemuOptsList *list;
 803     FILE *fp;
 804 };
 805
 806 static int config_write_opt(const char *name, const char *value, void *opaque)
 807 {
 808     struct ConfigWriteData *data = opaque;
 809
 810     fprintf(data->fp, "  %s = \"%s\"\n", name, value);
 811     return 0;
 812 }
 813
 814 static int config_write_opts(QemuOpts *opts, void *opaque)
 815 {
 816     struct ConfigWriteData *data = opaque;
 817     const char *id = qemu_opts_id(opts);
 818
 819     if (id) {
 820         fprintf(data->fp, "[%s \"%s\"]\n", data->list->name, id);
 821     } else {
 822         fprintf(data->fp, "[%s]\n", data->list->name);
 823     }
 824     qemu_opt_foreach(opts, config_write_opt, data, 0);
 825     fprintf(data->fp, "\n");
 826     return 0;
 827 }
 828
 829 void qemu_config_write(FILE *fp)
 830 {
 831     struct ConfigWriteData data = { .fp = fp };
 832     QemuOptsList **lists = vm_config_groups;
 833     int i;
 834
 835     fprintf(fp, "# qemu config file\n\n");
 836     for (i = 0; lists[i] != NULL; i++) {
 837         data.list = lists[i];
 838         qemu_opts_foreach(data.list, config_write_opts, &data, 0);
 839     }
 840 }
 841
 842 int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
 843 {
 844     char line[1024], group[64], id[64], arg[64], value[1024];
 845     Location loc;
 846     QemuOptsList *list = NULL;
 847     Error *local_err = NULL;
 848     QemuOpts *opts = NULL;
 849     int res = -1, lno = 0;
 850
 851     loc_push_none(&loc);
 852     while (fgets(line, sizeof(line), fp) != NULL) {
 853         loc_set_file(fname, ++lno);
 854         if (line[0] == '\n') {
 855             /* skip empty lines */
 856             continue;
 857         }
 858         if (line[0] == '#') {
 859             /* comment */
 860             continue;
 861         }
 862         if (sscanf(line, "[%63s \"%63[^\"]\"]", group, id) == 2) {
 863             /* group with id */
 864             list = find_list(lists, group, &local_err);
 865             if (error_is_set(&local_err)) {
 866                 error_report("%s\n", error_get_pretty(local_err));
 867                 error_free(local_err);
 868                 goto out;
 869             }
 870             opts = qemu_opts_create(list, id, 1, NULL);
 871             continue;
 872         }
 873         if (sscanf(line, "[%63[^]]]", group) == 1) {
 874             /* group without id */
 875             list = find_list(lists, group, &local_err);
 876             if (error_is_set(&local_err)) {
 877                 error_report("%s\n", error_get_pretty(local_err));
 878                 error_free(local_err);
 879                 goto out;
 880             }
 881             opts = qemu_opts_create(list, NULL, 0, NULL);
 882             continue;
 883         }
 884         if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2) {
 885             /* arg = value */
 886             if (opts == NULL) {
 887                 error_report("no group defined");
 888                 goto out;
 889             }
 890             if (qemu_opt_set(opts, arg, value) != 0) {
 891                 goto out;
 892             }
 893             continue;
 894         }
 895         error_report("parse error");
 896         goto out;
 897     }
 898     if (ferror(fp)) {
 899         error_report("error reading file");
 900         goto out;
 901     }
 902     res = 0;
 903 out:
 904     loc_pop(&loc);
 905     return res;
 906 }
 907
 908 int qemu_read_config_file(const char *filename)
 909 {
 910     FILE *f = fopen(filename, "r");
 911     int ret;
 912
 913     if (f == NULL) {
 914         return -errno;
 915     }
 916
 917     ret = qemu_config_parse(f, vm_config_groups, filename);
 918     fclose(f);
 919
 920     if (ret == 0) {
 921         return 0;
 922     } else {
 923         return -EINVAL;
 924     }
 925 }