qemu-config.c

   1 #include "qemu-common.h"
   2 #include "qemu/error-report.h"
   3 #include "qemu/option.h"
   4 #include "qemu/config-file.h"
   5 #include "hw/qdev.h"
   6 #include "qapi/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 QemuOptsList qemu_sandbox_opts = {
 370     .name = "sandbox",
 371     .implied_opt_name = "enable",
 372     .head = QTAILQ_HEAD_INITIALIZER(qemu_sandbox_opts.head),
 373     .desc = {
 374         {
 375             .name = "enable",
 376             .type = QEMU_OPT_BOOL,
 377         },
 378         { /* end of list */ }
 379     },
 380 };
 381
 382 static QemuOptsList qemu_mon_opts = {
 383     .name = "mon",
 384     .implied_opt_name = "chardev",
 385     .head = QTAILQ_HEAD_INITIALIZER(qemu_mon_opts.head),
 386     .desc = {
 387         {
 388             .name = "mode",
 389             .type = QEMU_OPT_STRING,
 390         },{
 391             .name = "chardev",
 392             .type = QEMU_OPT_STRING,
 393         },{
 394             .name = "default",
 395             .type = QEMU_OPT_BOOL,
 396         },{
 397             .name = "pretty",
 398             .type = QEMU_OPT_BOOL,
 399         },
 400         { /* end of list */ }
 401     },
 402 };
 403
 404 static QemuOptsList qemu_trace_opts = {
 405     .name = "trace",
 406     .implied_opt_name = "trace",
 407     .head = QTAILQ_HEAD_INITIALIZER(qemu_trace_opts.head),
 408     .desc = {
 409         {
 410             .name = "events",
 411             .type = QEMU_OPT_STRING,
 412         },{
 413             .name = "file",
 414             .type = QEMU_OPT_STRING,
 415         },
 416         { /* end of list */ }
 417     },
 418 };
 419
 420 QemuOptsList qemu_spice_opts = {
 421     .name = "spice",
 422     .head = QTAILQ_HEAD_INITIALIZER(qemu_spice_opts.head),
 423     .desc = {
 424         {
 425             .name = "port",
 426             .type = QEMU_OPT_NUMBER,
 427         },{
 428             .name = "tls-port",
 429             .type = QEMU_OPT_NUMBER,
 430         },{
 431             .name = "addr",
 432             .type = QEMU_OPT_STRING,
 433         },{
 434             .name = "ipv4",
 435             .type = QEMU_OPT_BOOL,
 436         },{
 437             .name = "ipv6",
 438             .type = QEMU_OPT_BOOL,
 439         },{
 440             .name = "password",
 441             .type = QEMU_OPT_STRING,
 442         },{
 443             .name = "disable-ticketing",
 444             .type = QEMU_OPT_BOOL,
 445         },{
 446             .name = "disable-copy-paste",
 447             .type = QEMU_OPT_BOOL,
 448         },{
 449             .name = "sasl",
 450             .type = QEMU_OPT_BOOL,
 451         },{
 452             .name = "x509-dir",
 453             .type = QEMU_OPT_STRING,
 454         },{
 455             .name = "x509-key-file",
 456             .type = QEMU_OPT_STRING,
 457         },{
 458             .name = "x509-key-password",
 459             .type = QEMU_OPT_STRING,
 460         },{
 461             .name = "x509-cert-file",
 462             .type = QEMU_OPT_STRING,
 463         },{
 464             .name = "x509-cacert-file",
 465             .type = QEMU_OPT_STRING,
 466         },{
 467             .name = "x509-dh-key-file",
 468             .type = QEMU_OPT_STRING,
 469         },{
 470             .name = "tls-ciphers",
 471             .type = QEMU_OPT_STRING,
 472         },{
 473             .name = "tls-channel",
 474             .type = QEMU_OPT_STRING,
 475         },{
 476             .name = "plaintext-channel",
 477             .type = QEMU_OPT_STRING,
 478         },{
 479             .name = "image-compression",
 480             .type = QEMU_OPT_STRING,
 481         },{
 482             .name = "jpeg-wan-compression",
 483             .type = QEMU_OPT_STRING,
 484         },{
 485             .name = "zlib-glz-wan-compression",
 486             .type = QEMU_OPT_STRING,
 487         },{
 488             .name = "streaming-video",
 489             .type = QEMU_OPT_STRING,
 490         },{
 491             .name = "agent-mouse",
 492             .type = QEMU_OPT_BOOL,
 493         },{
 494             .name = "playback-compression",
 495             .type = QEMU_OPT_BOOL,
 496         }, {
 497             .name = "seamless-migration",
 498             .type = QEMU_OPT_BOOL,
 499         },
 500         { /* end of list */ }
 501     },
 502 };
 503
 504 QemuOptsList qemu_option_rom_opts = {
 505     .name = "option-rom",
 506     .implied_opt_name = "romfile",
 507     .head = QTAILQ_HEAD_INITIALIZER(qemu_option_rom_opts.head),
 508     .desc = {
 509         {
 510             .name = "bootindex",
 511             .type = QEMU_OPT_NUMBER,
 512         }, {
 513             .name = "romfile",
 514             .type = QEMU_OPT_STRING,
 515         },
 516         { /* end of list */ }
 517     },
 518 };
 519
 520 static QemuOptsList qemu_machine_opts = {
 521     .name = "machine",
 522     .implied_opt_name = "type",
 523     .merge_lists = true,
 524     .head = QTAILQ_HEAD_INITIALIZER(qemu_machine_opts.head),
 525     .desc = {
 526         {
 527             .name = "type",
 528             .type = QEMU_OPT_STRING,
 529             .help = "emulated machine"
 530         }, {
 531             .name = "accel",
 532             .type = QEMU_OPT_STRING,
 533             .help = "accelerator list",
 534         }, {
 535             .name = "kernel_irqchip",
 536             .type = QEMU_OPT_BOOL,
 537             .help = "use KVM in-kernel irqchip",
 538         }, {
 539             .name = "kvm_shadow_mem",
 540             .type = QEMU_OPT_SIZE,
 541             .help = "KVM shadow MMU size",
 542         }, {
 543             .name = "kernel",
 544             .type = QEMU_OPT_STRING,
 545             .help = "Linux kernel image file",
 546         }, {
 547             .name = "initrd",
 548             .type = QEMU_OPT_STRING,
 549             .help = "Linux initial ramdisk file",
 550         }, {
 551             .name = "append",
 552             .type = QEMU_OPT_STRING,
 553             .help = "Linux kernel command line",
 554         }, {
 555             .name = "dtb",
 556             .type = QEMU_OPT_STRING,
 557             .help = "Linux kernel device tree file",
 558         }, {
 559             .name = "dumpdtb",
 560             .type = QEMU_OPT_STRING,
 561             .help = "Dump current dtb to a file and quit",
 562         }, {
 563             .name = "phandle_start",
 564             .type = QEMU_OPT_STRING,
 565             .help = "The first phandle ID we may generate dynamically",
 566         }, {
 567             .name = "dt_compatible",
 568             .type = QEMU_OPT_STRING,
 569             .help = "Overrides the \"compatible\" property of the dt root node",
 570         }, {
 571             .name = "dump-guest-core",
 572             .type = QEMU_OPT_BOOL,
 573             .help = "Include guest memory in  a core dump",
 574         }, {
 575             .name = "mem-merge",
 576             .type = QEMU_OPT_BOOL,
 577             .help = "enable/disable memory merge support",
 578         },{
 579             .name = "usb",
 580             .type = QEMU_OPT_BOOL,
 581             .help = "Set on/off to enable/disable usb",
 582         }, {
 583             .name = "nvram",
 584             .type = QEMU_OPT_STRING,
 585             .help = "Drive backing persistent NVRAM",
 586         },
 587         { /* End of list */ }
 588     },
 589 };
 590
 591 QemuOptsList qemu_boot_opts = {
 592     .name = "boot-opts",
 593     .head = QTAILQ_HEAD_INITIALIZER(qemu_boot_opts.head),
 594     .desc = {
 595         /* the three names below are not used now */
 596         {
 597             .name = "order",
 598             .type = QEMU_OPT_STRING,
 599         }, {
 600             .name = "once",
 601             .type = QEMU_OPT_STRING,
 602         }, {
 603             .name = "menu",
 604             .type = QEMU_OPT_STRING,
 605         /* following are really used */
 606         }, {
 607             .name = "splash",
 608             .type = QEMU_OPT_STRING,
 609         }, {
 610             .name = "splash-time",
 611             .type = QEMU_OPT_STRING,
 612         }, {
 613             .name = "reboot-timeout",
 614             .type = QEMU_OPT_STRING,
 615         },
 616         { /*End of list */ }
 617     },
 618 };
 619
 620 static QemuOptsList qemu_add_fd_opts = {
 621     .name = "add-fd",
 622     .head = QTAILQ_HEAD_INITIALIZER(qemu_add_fd_opts.head),
 623     .desc = {
 624         {
 625             .name = "fd",
 626             .type = QEMU_OPT_NUMBER,
 627             .help = "file descriptor of which a duplicate is added to fd set",
 628         },{
 629             .name = "set",
 630             .type = QEMU_OPT_NUMBER,
 631             .help = "ID of the fd set to add fd to",
 632         },{
 633             .name = "opaque",
 634             .type = QEMU_OPT_STRING,
 635             .help = "free-form string used to describe fd",
 636         },
 637         { /* end of list */ }
 638     },
 639 };
 640
 641 static QemuOptsList qemu_object_opts = {
 642     .name = "object",
 643     .implied_opt_name = "qom-type",
 644     .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
 645     .desc = {
 646         { }
 647     },
 648 };
 649
 650 static QemuOptsList *vm_config_groups[32] = {
 651     &qemu_drive_opts,
 652     &qemu_chardev_opts,
 653     &qemu_device_opts,
 654     &qemu_netdev_opts,
 655     &qemu_net_opts,
 656     &qemu_rtc_opts,
 657     &qemu_global_opts,
 658     &qemu_mon_opts,
 659     &qemu_trace_opts,
 660     &qemu_option_rom_opts,
 661     &qemu_machine_opts,
 662     &qemu_boot_opts,
 663     &qemu_iscsi_opts,
 664     &qemu_sandbox_opts,
 665     &qemu_add_fd_opts,
 666     &qemu_object_opts,
 667     NULL,
 668 };
 669
 670 static QemuOptsList *find_list(QemuOptsList **lists, const char *group,
 671                                Error **errp)
 672 {
 673     int i;
 674
 675     for (i = 0; lists[i] != NULL; i++) {
 676         if (strcmp(lists[i]->name, group) == 0)
 677             break;
 678     }
 679     if (lists[i] == NULL) {
 680         error_set(errp, QERR_INVALID_OPTION_GROUP, group);
 681     }
 682     return lists[i];
 683 }
 684
 685 QemuOptsList *qemu_find_opts(const char *group)
 686 {
 687     QemuOptsList *ret;
 688     Error *local_err = NULL;
 689
 690     ret = find_list(vm_config_groups, group, &local_err);
 691     if (error_is_set(&local_err)) {
 692         error_report("%s\n", error_get_pretty(local_err));
 693         error_free(local_err);
 694     }
 695
 696     return ret;
 697 }
 698
 699 QemuOptsList *qemu_find_opts_err(const char *group, Error **errp)
 700 {
 701     return find_list(vm_config_groups, group, errp);
 702 }
 703
 704 void qemu_add_opts(QemuOptsList *list)
 705 {
 706     int entries, i;
 707
 708     entries = ARRAY_SIZE(vm_config_groups);
 709     entries--; /* keep list NULL terminated */
 710     for (i = 0; i < entries; i++) {
 711         if (vm_config_groups[i] == NULL) {
 712             vm_config_groups[i] = list;
 713             return;
 714         }
 715     }
 716     fprintf(stderr, "ran out of space in vm_config_groups");
 717     abort();
 718 }
 719
 720 int qemu_set_option(const char *str)
 721 {
 722     char group[64], id[64], arg[64];
 723     QemuOptsList *list;
 724     QemuOpts *opts;
 725     int rc, offset;
 726
 727     rc = sscanf(str, "%63[^.].%63[^.].%63[^=]%n", group, id, arg, &offset);
 728     if (rc < 3 || str[offset] != '=') {
 729         error_report("can't parse: \"%s\"", str);
 730         return -1;
 731     }
 732
 733     list = qemu_find_opts(group);
 734     if (list == NULL) {
 735         return -1;
 736     }
 737
 738     opts = qemu_opts_find(list, id);
 739     if (!opts) {
 740         error_report("there is no %s \"%s\" defined",
 741                      list->name, id);
 742         return -1;
 743     }
 744
 745     if (qemu_opt_set(opts, arg, str+offset+1) == -1) {
 746         return -1;
 747     }
 748     return 0;
 749 }
 750
 751 int qemu_global_option(const char *str)
 752 {
 753     char driver[64], property[64];
 754     QemuOpts *opts;
 755     int rc, offset;
 756
 757     rc = sscanf(str, "%63[^.].%63[^=]%n", driver, property, &offset);
 758     if (rc < 2 || str[offset] != '=') {
 759         error_report("can't parse: \"%s\"", str);
 760         return -1;
 761     }
 762
 763     opts = qemu_opts_create_nofail(&qemu_global_opts);
 764     qemu_opt_set(opts, "driver", driver);
 765     qemu_opt_set(opts, "property", property);
 766     qemu_opt_set(opts, "value", str+offset+1);
 767     return 0;
 768 }
 769
 770 struct ConfigWriteData {
 771     QemuOptsList *list;
 772     FILE *fp;
 773 };
 774
 775 static int config_write_opt(const char *name, const char *value, void *opaque)
 776 {
 777     struct ConfigWriteData *data = opaque;
 778
 779     fprintf(data->fp, "  %s = \"%s\"\n", name, value);
 780     return 0;
 781 }
 782
 783 static int config_write_opts(QemuOpts *opts, void *opaque)
 784 {
 785     struct ConfigWriteData *data = opaque;
 786     const char *id = qemu_opts_id(opts);
 787
 788     if (id) {
 789         fprintf(data->fp, "[%s \"%s\"]\n", data->list->name, id);
 790     } else {
 791         fprintf(data->fp, "[%s]\n", data->list->name);
 792     }
 793     qemu_opt_foreach(opts, config_write_opt, data, 0);
 794     fprintf(data->fp, "\n");
 795     return 0;
 796 }
 797
 798 void qemu_config_write(FILE *fp)
 799 {
 800     struct ConfigWriteData data = { .fp = fp };
 801     QemuOptsList **lists = vm_config_groups;
 802     int i;
 803
 804     fprintf(fp, "# qemu config file\n\n");
 805     for (i = 0; lists[i] != NULL; i++) {
 806         data.list = lists[i];
 807         qemu_opts_foreach(data.list, config_write_opts, &data, 0);
 808     }
 809 }
 810
 811 int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
 812 {
 813     char line[1024], group[64], id[64], arg[64], value[1024];
 814     Location loc;
 815     QemuOptsList *list = NULL;
 816     Error *local_err = NULL;
 817     QemuOpts *opts = NULL;
 818     int res = -1, lno = 0;
 819
 820     loc_push_none(&loc);
 821     while (fgets(line, sizeof(line), fp) != NULL) {
 822         loc_set_file(fname, ++lno);
 823         if (line[0] == '\n') {
 824             /* skip empty lines */
 825             continue;
 826         }
 827         if (line[0] == '#') {
 828             /* comment */
 829             continue;
 830         }
 831         if (sscanf(line, "[%63s \"%63[^\"]\"]", group, id) == 2) {
 832             /* group with id */
 833             list = find_list(lists, group, &local_err);
 834             if (error_is_set(&local_err)) {
 835                 error_report("%s\n", error_get_pretty(local_err));
 836                 error_free(local_err);
 837                 goto out;
 838             }
 839             opts = qemu_opts_create(list, id, 1, NULL);
 840             continue;
 841         }
 842         if (sscanf(line, "[%63[^]]]", group) == 1) {
 843             /* group without id */
 844             list = find_list(lists, group, &local_err);
 845             if (error_is_set(&local_err)) {
 846                 error_report("%s\n", error_get_pretty(local_err));
 847                 error_free(local_err);
 848                 goto out;
 849             }
 850             opts = qemu_opts_create_nofail(list);
 851             continue;
 852         }
 853         if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2) {
 854             /* arg = value */
 855             if (opts == NULL) {
 856                 error_report("no group defined");
 857                 goto out;
 858             }
 859             if (qemu_opt_set(opts, arg, value) != 0) {
 860                 goto out;
 861             }
 862             continue;
 863         }
 864         error_report("parse error");
 865         goto out;
 866     }
 867     if (ferror(fp)) {
 868         error_report("error reading file");
 869         goto out;
 870     }
 871     res = 0;
 872 out:
 873     loc_pop(&loc);
 874     return res;
 875 }
 876
 877 int qemu_read_config_file(const char *filename)
 878 {
 879     FILE *f = fopen(filename, "r");
 880     int ret;
 881
 882     if (f == NULL) {
 883         return -errno;
 884     }
 885
 886     ret = qemu_config_parse(f, vm_config_groups, filename);
 887     fclose(f);
 888
 889     if (ret == 0) {
 890         return 0;
 891     } else {
 892         return -EINVAL;
 893     }
 894 }