qdev-monitor.c

   1 /*
   2  *  Dynamic device configuration and creation.
   3  *
   4  *  Copyright (c) 2009 CodeSourcery
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "hw/qdev.h"
  21 #include "hw/sysbus.h"
  22 #include "monitor/monitor.h"
  23 #include "monitor/qdev.h"
  24 #include "qmp-commands.h"
  25 #include "sysemu/arch_init.h"
  26 #include "qemu/config-file.h"
  27
  28 /*
  29  * Aliases were a bad idea from the start.  Let's keep them
  30  * from spreading further.
  31  */
  32 typedef struct QDevAlias
  33 {
  34     const char *typename;
  35     const char *alias;
  36     uint32_t arch_mask;
  37 } QDevAlias;
  38
  39 static const QDevAlias qdev_alias_table[] = {
  40     { "virtio-blk-pci", "virtio-blk", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  41     { "virtio-net-pci", "virtio-net", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  42     { "virtio-serial-pci", "virtio-serial", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  43     { "virtio-balloon-pci", "virtio-balloon",
  44             QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  45     { "virtio-blk-s390", "virtio-blk", QEMU_ARCH_S390X },
  46     { "virtio-net-s390", "virtio-net", QEMU_ARCH_S390X },
  47     { "virtio-serial-s390", "virtio-serial", QEMU_ARCH_S390X },
  48     { "lsi53c895a", "lsi" },
  49     { "ich9-ahci", "ahci" },
  50     { "kvm-pci-assign", "pci-assign" },
  51     { }
  52 };
  53
  54 static const char *qdev_class_get_alias(DeviceClass *dc)
  55 {
  56     const char *typename = object_class_get_name(OBJECT_CLASS(dc));
  57     int i;
  58
  59     for (i = 0; qdev_alias_table[i].typename; i++) {
  60         if (qdev_alias_table[i].arch_mask &&
  61             !(qdev_alias_table[i].arch_mask & arch_type)) {
  62             continue;
  63         }
  64
  65         if (strcmp(qdev_alias_table[i].typename, typename) == 0) {
  66             return qdev_alias_table[i].alias;
  67         }
  68     }
  69
  70     return NULL;
  71 }
  72
  73 static bool qdev_class_has_alias(DeviceClass *dc)
  74 {
  75     return (qdev_class_get_alias(dc) != NULL);
  76 }
  77
  78 static void qdev_print_devinfo(DeviceClass *dc)
  79 {
  80     error_printf("name \"%s\"", object_class_get_name(OBJECT_CLASS(dc)));
  81     if (dc->bus_type) {
  82         error_printf(", bus %s", dc->bus_type);
  83     }
  84     if (qdev_class_has_alias(dc)) {
  85         error_printf(", alias \"%s\"", qdev_class_get_alias(dc));
  86     }
  87     if (dc->desc) {
  88         error_printf(", desc \"%s\"", dc->desc);
  89     }
  90     if (dc->cannot_instantiate_with_device_add_yet) {
  91         error_printf(", no-user");
  92     }
  93     error_printf("\n");
  94 }
  95
  96 static gint devinfo_cmp(gconstpointer a, gconstpointer b)
  97 {
  98     return strcasecmp(object_class_get_name((ObjectClass *)a),
  99                       object_class_get_name((ObjectClass *)b));
 100 }
 101
 102 static void qdev_print_devinfos(bool show_no_user)
 103 {
 104     static const char *cat_name[DEVICE_CATEGORY_MAX + 1] = {
 105         [DEVICE_CATEGORY_BRIDGE]  = "Controller/Bridge/Hub",
 106         [DEVICE_CATEGORY_USB]     = "USB",
 107         [DEVICE_CATEGORY_STORAGE] = "Storage",
 108         [DEVICE_CATEGORY_NETWORK] = "Network",
 109         [DEVICE_CATEGORY_INPUT]   = "Input",
 110         [DEVICE_CATEGORY_DISPLAY] = "Display",
 111         [DEVICE_CATEGORY_SOUND]   = "Sound",
 112         [DEVICE_CATEGORY_MISC]    = "Misc",
 113         [DEVICE_CATEGORY_MAX]     = "Uncategorized",
 114     };
 115     GSList *list, *elt;
 116     int i;
 117     bool cat_printed;
 118
 119     list = g_slist_sort(object_class_get_list(TYPE_DEVICE, false),
 120                         devinfo_cmp);
 121
 122     for (i = 0; i <= DEVICE_CATEGORY_MAX; i++) {
 123         cat_printed = false;
 124         for (elt = list; elt; elt = elt->next) {
 125             DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, elt->data,
 126                                                  TYPE_DEVICE);
 127             if ((i < DEVICE_CATEGORY_MAX
 128                  ? !test_bit(i, dc->categories)
 129                  : !bitmap_empty(dc->categories, DEVICE_CATEGORY_MAX))
 130                 || (!show_no_user
 131                     && dc->cannot_instantiate_with_device_add_yet)) {
 132                 continue;
 133             }
 134             if (!cat_printed) {
 135                 error_printf("%s%s devices:\n", i ? "\n" : "",
 136                              cat_name[i]);
 137                 cat_printed = true;
 138             }
 139             qdev_print_devinfo(dc);
 140         }
 141     }
 142
 143     g_slist_free(list);
 144 }
 145
 146 static int set_property(const char *name, const char *value, void *opaque)
 147 {
 148     Object *obj = opaque;
 149     Error *err = NULL;
 150
 151     if (strcmp(name, "driver") == 0)
 152         return 0;
 153     if (strcmp(name, "bus") == 0)
 154         return 0;
 155
 156     object_property_parse(obj, value, name, &err);
 157     if (err != NULL) {
 158         qerror_report_err(err);
 159         error_free(err);
 160         return -1;
 161     }
 162     return 0;
 163 }
 164
 165 static const char *find_typename_by_alias(const char *alias)
 166 {
 167     int i;
 168
 169     for (i = 0; qdev_alias_table[i].alias; i++) {
 170         if (qdev_alias_table[i].arch_mask &&
 171             !(qdev_alias_table[i].arch_mask & arch_type)) {
 172             continue;
 173         }
 174
 175         if (strcmp(qdev_alias_table[i].alias, alias) == 0) {
 176             return qdev_alias_table[i].typename;
 177         }
 178     }
 179
 180     return NULL;
 181 }
 182
 183 int qdev_device_help(QemuOpts *opts)
 184 {
 185     const char *driver;
 186     Property *prop;
 187     ObjectClass *klass;
 188
 189     driver = qemu_opt_get(opts, "driver");
 190     if (driver && is_help_option(driver)) {
 191         qdev_print_devinfos(false);
 192         return 1;
 193     }
 194
 195     if (!driver || !qemu_opt_has_help_opt(opts)) {
 196         return 0;
 197     }
 198
 199     klass = object_class_by_name(driver);
 200     if (!klass) {
 201         const char *typename = find_typename_by_alias(driver);
 202
 203         if (typename) {
 204             driver = typename;
 205             klass = object_class_by_name(driver);
 206         }
 207     }
 208
 209     if (!klass) {
 210         return 0;
 211     }
 212     do {
 213         for (prop = DEVICE_CLASS(klass)->props; prop && prop->name; prop++) {
 214             /*
 215              * TODO Properties without a parser are just for dirty hacks.
 216              * qdev_prop_ptr is the only such PropertyInfo.  It's marked
 217              * for removal.  This conditional should be removed along with
 218              * it.
 219              */
 220             if (!prop->info->set) {
 221                 continue;           /* no way to set it, don't show */
 222             }
 223             error_printf("%s.%s=%s\n", driver, prop->name,
 224                          prop->info->legacy_name ?: prop->info->name);
 225         }
 226         klass = object_class_get_parent(klass);
 227     } while (klass != object_class_by_name(TYPE_DEVICE));
 228     return 1;
 229 }
 230
 231 static Object *qdev_get_peripheral(void)
 232 {
 233     static Object *dev;
 234
 235     if (dev == NULL) {
 236         dev = container_get(qdev_get_machine(), "/peripheral");
 237     }
 238
 239     return dev;
 240 }
 241
 242 static Object *qdev_get_peripheral_anon(void)
 243 {
 244     static Object *dev;
 245
 246     if (dev == NULL) {
 247         dev = container_get(qdev_get_machine(), "/peripheral-anon");
 248     }
 249
 250     return dev;
 251 }
 252
 253 static void qbus_list_bus(DeviceState *dev)
 254 {
 255     BusState *child;
 256     const char *sep = " ";
 257
 258     error_printf("child busses at \"%s\":",
 259                  dev->id ? dev->id : object_get_typename(OBJECT(dev)));
 260     QLIST_FOREACH(child, &dev->child_bus, sibling) {
 261         error_printf("%s\"%s\"", sep, child->name);
 262         sep = ", ";
 263     }
 264     error_printf("\n");
 265 }
 266
 267 static void qbus_list_dev(BusState *bus)
 268 {
 269     BusChild *kid;
 270     const char *sep = " ";
 271
 272     error_printf("devices at \"%s\":", bus->name);
 273     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 274         DeviceState *dev = kid->child;
 275         error_printf("%s\"%s\"", sep, object_get_typename(OBJECT(dev)));
 276         if (dev->id)
 277             error_printf("/\"%s\"", dev->id);
 278         sep = ", ";
 279     }
 280     error_printf("\n");
 281 }
 282
 283 static BusState *qbus_find_bus(DeviceState *dev, char *elem)
 284 {
 285     BusState *child;
 286
 287     QLIST_FOREACH(child, &dev->child_bus, sibling) {
 288         if (strcmp(child->name, elem) == 0) {
 289             return child;
 290         }
 291     }
 292     return NULL;
 293 }
 294
 295 static DeviceState *qbus_find_dev(BusState *bus, char *elem)
 296 {
 297     BusChild *kid;
 298
 299     /*
 300      * try to match in order:
 301      *   (1) instance id, if present
 302      *   (2) driver name
 303      *   (3) driver alias, if present
 304      */
 305     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 306         DeviceState *dev = kid->child;
 307         if (dev->id  &&  strcmp(dev->id, elem) == 0) {
 308             return dev;
 309         }
 310     }
 311     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 312         DeviceState *dev = kid->child;
 313         if (strcmp(object_get_typename(OBJECT(dev)), elem) == 0) {
 314             return dev;
 315         }
 316     }
 317     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 318         DeviceState *dev = kid->child;
 319         DeviceClass *dc = DEVICE_GET_CLASS(dev);
 320
 321         if (qdev_class_has_alias(dc) &&
 322             strcmp(qdev_class_get_alias(dc), elem) == 0) {
 323             return dev;
 324         }
 325     }
 326     return NULL;
 327 }
 328
 329 static BusState *qbus_find_recursive(BusState *bus, const char *name,
 330                                      const char *bus_typename)
 331 {
 332     BusClass *bus_class = BUS_GET_CLASS(bus);
 333     BusChild *kid;
 334     BusState *child, *ret;
 335     int match = 1;
 336
 337     if (name && (strcmp(bus->name, name) != 0)) {
 338         match = 0;
 339     } else if (bus_typename && !object_dynamic_cast(OBJECT(bus), bus_typename)) {
 340         match = 0;
 341     } else if ((bus_class->max_dev != 0) && (bus_class->max_dev <= bus->max_index)) {
 342         if (name != NULL) {
 343             /* bus was explicitly specified: return an error. */
 344             qerror_report(ERROR_CLASS_GENERIC_ERROR, "Bus '%s' is full",
 345                           bus->name);
 346             return NULL;
 347         } else {
 348             /* bus was not specified: try to find another one. */
 349             match = 0;
 350         }
 351     }
 352     if (match) {
 353         return bus;
 354     }
 355
 356     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 357         DeviceState *dev = kid->child;
 358         QLIST_FOREACH(child, &dev->child_bus, sibling) {
 359             ret = qbus_find_recursive(child, name, bus_typename);
 360             if (ret) {
 361                 return ret;
 362             }
 363         }
 364     }
 365     return NULL;
 366 }
 367
 368 static BusState *qbus_find(const char *path)
 369 {
 370     DeviceState *dev;
 371     BusState *bus;
 372     char elem[128];
 373     int pos, len;
 374
 375     /* find start element */
 376     if (path[0] == '/') {
 377         bus = sysbus_get_default();
 378         pos = 0;
 379     } else {
 380         if (sscanf(path, "%127[^/]%n", elem, &len) != 1) {
 381             assert(!path[0]);
 382             elem[0] = len = 0;
 383         }
 384         bus = qbus_find_recursive(sysbus_get_default(), elem, NULL);
 385         if (!bus) {
 386             qerror_report(QERR_BUS_NOT_FOUND, elem);
 387             return NULL;
 388         }
 389         pos = len;
 390     }
 391
 392     for (;;) {
 393         assert(path[pos] == '/' || !path[pos]);
 394         while (path[pos] == '/') {
 395             pos++;
 396         }
 397         if (path[pos] == '\0') {
 398             return bus;
 399         }
 400
 401         /* find device */
 402         if (sscanf(path+pos, "%127[^/]%n", elem, &len) != 1) {
 403             g_assert_not_reached();
 404             elem[0] = len = 0;
 405         }
 406         pos += len;
 407         dev = qbus_find_dev(bus, elem);
 408         if (!dev) {
 409             qerror_report(QERR_DEVICE_NOT_FOUND, elem);
 410             if (!monitor_cur_is_qmp()) {
 411                 qbus_list_dev(bus);
 412             }
 413             return NULL;
 414         }
 415
 416         assert(path[pos] == '/' || !path[pos]);
 417         while (path[pos] == '/') {
 418             pos++;
 419         }
 420         if (path[pos] == '\0') {
 421             /* last specified element is a device.  If it has exactly
 422              * one child bus accept it nevertheless */
 423             switch (dev->num_child_bus) {
 424             case 0:
 425                 qerror_report(QERR_DEVICE_NO_BUS, elem);
 426                 return NULL;
 427             case 1:
 428                 return QLIST_FIRST(&dev->child_bus);
 429             default:
 430                 qerror_report(QERR_DEVICE_MULTIPLE_BUSSES, elem);
 431                 if (!monitor_cur_is_qmp()) {
 432                     qbus_list_bus(dev);
 433                 }
 434                 return NULL;
 435             }
 436         }
 437
 438         /* find bus */
 439         if (sscanf(path+pos, "%127[^/]%n", elem, &len) != 1) {
 440             g_assert_not_reached();
 441             elem[0] = len = 0;
 442         }
 443         pos += len;
 444         bus = qbus_find_bus(dev, elem);
 445         if (!bus) {
 446             qerror_report(QERR_BUS_NOT_FOUND, elem);
 447             if (!monitor_cur_is_qmp()) {
 448                 qbus_list_bus(dev);
 449             }
 450             return NULL;
 451         }
 452     }
 453 }
 454
 455 DeviceState *qdev_device_add(QemuOpts *opts)
 456 {
 457     ObjectClass *oc;
 458     DeviceClass *dc;
 459     const char *driver, *path, *id;
 460     DeviceState *dev;
 461     BusState *bus = NULL;
 462     Error *err = NULL;
 463
 464     driver = qemu_opt_get(opts, "driver");
 465     if (!driver) {
 466         qerror_report(QERR_MISSING_PARAMETER, "driver");
 467         return NULL;
 468     }
 469
 470     /* find driver */
 471     oc = object_class_by_name(driver);
 472     if (!oc) {
 473         const char *typename = find_typename_by_alias(driver);
 474
 475         if (typename) {
 476             driver = typename;
 477             oc = object_class_by_name(driver);
 478         }
 479     }
 480
 481     if (!object_class_dynamic_cast(oc, TYPE_DEVICE)) {
 482         qerror_report(ERROR_CLASS_GENERIC_ERROR,
 483                       "'%s' is not a valid device model name", driver);
 484         return NULL;
 485     }
 486
 487     if (object_class_is_abstract(oc)) {
 488         qerror_report(QERR_INVALID_PARAMETER_VALUE, "driver",
 489                       "non-abstract device type");
 490         return NULL;
 491     }
 492
 493     dc = DEVICE_CLASS(oc);
 494     if (dc->cannot_instantiate_with_device_add_yet) {
 495         qerror_report(QERR_INVALID_PARAMETER_VALUE, "driver",
 496                       "pluggable device type");
 497         return NULL;
 498     }
 499
 500     /* find bus */
 501     path = qemu_opt_get(opts, "bus");
 502     if (path != NULL) {
 503         bus = qbus_find(path);
 504         if (!bus) {
 505             return NULL;
 506         }
 507         if (!object_dynamic_cast(OBJECT(bus), dc->bus_type)) {
 508             qerror_report(QERR_BAD_BUS_FOR_DEVICE,
 509                           driver, object_get_typename(OBJECT(bus)));
 510             return NULL;
 511         }
 512     } else if (dc->bus_type != NULL) {
 513         bus = qbus_find_recursive(sysbus_get_default(), NULL, dc->bus_type);
 514         if (!bus) {
 515             qerror_report(QERR_NO_BUS_FOR_DEVICE,
 516                           dc->bus_type, driver);
 517             return NULL;
 518         }
 519     }
 520     if (qdev_hotplug && bus && !bus->allow_hotplug) {
 521         qerror_report(QERR_BUS_NO_HOTPLUG, bus->name);
 522         return NULL;
 523     }
 524
 525     /* create device */
 526     dev = DEVICE(object_new(driver));
 527
 528     if (bus) {
 529         qdev_set_parent_bus(dev, bus);
 530     }
 531
 532     id = qemu_opts_id(opts);
 533     if (id) {
 534         dev->id = id;
 535     }
 536
 537     if (dev->id) {
 538         object_property_add_child(qdev_get_peripheral(), dev->id,
 539                                   OBJECT(dev), NULL);
 540     } else {
 541         static int anon_count;
 542         gchar *name = g_strdup_printf("device[%d]", anon_count++);
 543         object_property_add_child(qdev_get_peripheral_anon(), name,
 544                                   OBJECT(dev), NULL);
 545         g_free(name);
 546     }
 547
 548     /* set properties */
 549     if (qemu_opt_foreach(opts, set_property, dev, 1) != 0) {
 550         object_unparent(OBJECT(dev));
 551         object_unref(OBJECT(dev));
 552         return NULL;
 553     }
 554
 555     dev->opts = opts;
 556     object_property_set_bool(OBJECT(dev), true, "realized", &err);
 557     if (err != NULL) {
 558         qerror_report_err(err);
 559         error_free(err);
 560         dev->opts = NULL;
 561         object_unparent(OBJECT(dev));
 562         object_unref(OBJECT(dev));
 563         qerror_report(QERR_DEVICE_INIT_FAILED, driver);
 564         return NULL;
 565     }
 566     return dev;
 567 }
 568
 569
 570 #define qdev_printf(fmt, ...) monitor_printf(mon, "%*s" fmt, indent, "", ## __VA_ARGS__)
 571 static void qbus_print(Monitor *mon, BusState *bus, int indent);
 572
 573 static void qdev_print_props(Monitor *mon, DeviceState *dev, Property *props,
 574                              int indent)
 575 {
 576     if (!props)
 577         return;
 578     for (; props->name; props++) {
 579         Error *err = NULL;
 580         char *value;
 581         char *legacy_name = g_strdup_printf("legacy-%s", props->name);
 582         if (object_property_get_type(OBJECT(dev), legacy_name, NULL)) {
 583             value = object_property_get_str(OBJECT(dev), legacy_name, &err);
 584         } else {
 585             value = object_property_print(OBJECT(dev), props->name, true, &err);
 586         }
 587         g_free(legacy_name);
 588
 589         if (err) {
 590             error_free(err);
 591             continue;
 592         }
 593         qdev_printf("%s = %s\n", props->name,
 594                     value && *value ? value : "<null>");
 595         g_free(value);
 596     }
 597 }
 598
 599 static void bus_print_dev(BusState *bus, Monitor *mon, DeviceState *dev, int indent)
 600 {
 601     BusClass *bc = BUS_GET_CLASS(bus);
 602
 603     if (bc->print_dev) {
 604         bc->print_dev(mon, dev, indent);
 605     }
 606 }
 607
 608 static void qdev_print(Monitor *mon, DeviceState *dev, int indent)
 609 {
 610     ObjectClass *class;
 611     BusState *child;
 612     qdev_printf("dev: %s, id \"%s\"\n", object_get_typename(OBJECT(dev)),
 613                 dev->id ? dev->id : "");
 614     indent += 2;
 615     if (dev->num_gpio_in) {
 616         qdev_printf("gpio-in %d\n", dev->num_gpio_in);
 617     }
 618     if (dev->num_gpio_out) {
 619         qdev_printf("gpio-out %d\n", dev->num_gpio_out);
 620     }
 621     class = object_get_class(OBJECT(dev));
 622     do {
 623         qdev_print_props(mon, dev, DEVICE_CLASS(class)->props, indent);
 624         class = object_class_get_parent(class);
 625     } while (class != object_class_by_name(TYPE_DEVICE));
 626     bus_print_dev(dev->parent_bus, mon, dev, indent);
 627     QLIST_FOREACH(child, &dev->child_bus, sibling) {
 628         qbus_print(mon, child, indent);
 629     }
 630 }
 631
 632 static void qbus_print(Monitor *mon, BusState *bus, int indent)
 633 {
 634     BusChild *kid;
 635
 636     qdev_printf("bus: %s\n", bus->name);
 637     indent += 2;
 638     qdev_printf("type %s\n", object_get_typename(OBJECT(bus)));
 639     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 640         DeviceState *dev = kid->child;
 641         qdev_print(mon, dev, indent);
 642     }
 643 }
 644 #undef qdev_printf
 645
 646 void do_info_qtree(Monitor *mon, const QDict *qdict)
 647 {
 648     if (sysbus_get_default())
 649         qbus_print(mon, sysbus_get_default(), 0);
 650 }
 651
 652 void do_info_qdm(Monitor *mon, const QDict *qdict)
 653 {
 654     qdev_print_devinfos(true);
 655 }
 656
 657 int do_device_add(Monitor *mon, const QDict *qdict, QObject **ret_data)
 658 {
 659     Error *local_err = NULL;
 660     QemuOpts *opts;
 661     DeviceState *dev;
 662
 663     opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict, &local_err);
 664     if (local_err) {
 665         qerror_report_err(local_err);
 666         error_free(local_err);
 667         return -1;
 668     }
 669     if (!monitor_cur_is_qmp() && qdev_device_help(opts)) {
 670         qemu_opts_del(opts);
 671         return 0;
 672     }
 673     dev = qdev_device_add(opts);
 674     if (!dev) {
 675         qemu_opts_del(opts);
 676         return -1;
 677     }
 678     object_unref(OBJECT(dev));
 679     return 0;
 680 }
 681
 682 void qmp_device_del(const char *id, Error **errp)
 683 {
 684     DeviceState *dev;
 685
 686     dev = qdev_find_recursive(sysbus_get_default(), id);
 687     if (NULL == dev) {
 688         error_set(errp, QERR_DEVICE_NOT_FOUND, id);
 689         return;
 690     }
 691
 692     qdev_unplug(dev, errp);
 693 }
 694
 695 void qdev_machine_init(void)
 696 {
 697     qdev_get_peripheral_anon();
 698     qdev_get_peripheral();
 699 }
 700
 701 QemuOptsList qemu_device_opts = {
 702     .name = "device",
 703     .implied_opt_name = "driver",
 704     .head = QTAILQ_HEAD_INITIALIZER(qemu_device_opts.head),
 705     .desc = {
 706         /*
 707          * no elements => accept any
 708          * sanity checking will happen later
 709          * when setting device properties
 710          */
 711         { /* end of list */ }
 712     },
 713 };
 714
 715 QemuOptsList qemu_global_opts = {
 716     .name = "global",
 717     .head = QTAILQ_HEAD_INITIALIZER(qemu_global_opts.head),
 718     .desc = {
 719         {
 720             .name = "driver",
 721             .type = QEMU_OPT_STRING,
 722         },{
 723             .name = "property",
 724             .type = QEMU_OPT_STRING,
 725         },{
 726             .name = "value",
 727             .type = QEMU_OPT_STRING,
 728         },
 729         { /* end of list */ }
 730     },
 731 };
 732
 733 int qemu_global_option(const char *str)
 734 {
 735     char driver[64], property[64];
 736     QemuOpts *opts;
 737     int rc, offset;
 738
 739     rc = sscanf(str, "%63[^.].%63[^=]%n", driver, property, &offset);
 740     if (rc < 2 || str[offset] != '=') {
 741         error_report("can't parse: \"%s\"", str);
 742         return -1;
 743     }
 744
 745     opts = qemu_opts_create(&qemu_global_opts, NULL, 0, &error_abort);
 746     qemu_opt_set(opts, "driver", driver);
 747     qemu_opt_set(opts, "property", property);
 748     qemu_opt_set(opts, "value", str+offset+1);
 749     return 0;
 750 }