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 static DeviceClass *qdev_get_device_class(const char **driver, Error **errp)
 184 {
 185     ObjectClass *oc;
 186     DeviceClass *dc;
 187
 188     oc = object_class_by_name(*driver);
 189     if (!oc) {
 190         const char *typename = find_typename_by_alias(*driver);
 191
 192         if (typename) {
 193             *driver = typename;
 194             oc = object_class_by_name(*driver);
 195         }
 196     }
 197
 198     if (!object_class_dynamic_cast(oc, TYPE_DEVICE)) {
 199         error_setg(errp, "'%s' is not a valid device model name", *driver);
 200         return NULL;
 201     }
 202
 203     if (object_class_is_abstract(oc)) {
 204         error_set(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
 205                   "non-abstract device type");
 206         return NULL;
 207     }
 208
 209     dc = DEVICE_CLASS(oc);
 210     if (dc->cannot_instantiate_with_device_add_yet ||
 211         (qdev_hotplug && !dc->hotpluggable)) {
 212         error_set(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
 213                   "pluggable device type");
 214         return NULL;
 215     }
 216
 217     return dc;
 218 }
 219
 220
 221 int qdev_device_help(QemuOpts *opts)
 222 {
 223     Error *local_err = NULL;
 224     const char *driver;
 225     DevicePropertyInfoList *prop_list;
 226     DevicePropertyInfoList *prop;
 227
 228     driver = qemu_opt_get(opts, "driver");
 229     if (driver && is_help_option(driver)) {
 230         qdev_print_devinfos(false);
 231         return 1;
 232     }
 233
 234     if (!driver || !qemu_opt_has_help_opt(opts)) {
 235         return 0;
 236     }
 237
 238     qdev_get_device_class(&driver, &local_err);
 239     if (local_err) {
 240         goto error;
 241     }
 242
 243     prop_list = qmp_device_list_properties(driver, &local_err);
 244     if (local_err) {
 245         goto error;
 246     }
 247
 248     for (prop = prop_list; prop; prop = prop->next) {
 249         error_printf("%s.%s=%s", driver,
 250                      prop->value->name,
 251                      prop->value->type);
 252         if (prop->value->has_description) {
 253             error_printf(" (%s)\n", prop->value->description);
 254         } else {
 255             error_printf("\n");
 256         }
 257     }
 258
 259     qapi_free_DevicePropertyInfoList(prop_list);
 260     return 1;
 261
 262 error:
 263     error_printf("%s\n", error_get_pretty(local_err));
 264     error_free(local_err);
 265     return 1;
 266 }
 267
 268 static Object *qdev_get_peripheral(void)
 269 {
 270     static Object *dev;
 271
 272     if (dev == NULL) {
 273         dev = container_get(qdev_get_machine(), "/peripheral");
 274     }
 275
 276     return dev;
 277 }
 278
 279 static Object *qdev_get_peripheral_anon(void)
 280 {
 281     static Object *dev;
 282
 283     if (dev == NULL) {
 284         dev = container_get(qdev_get_machine(), "/peripheral-anon");
 285     }
 286
 287     return dev;
 288 }
 289
 290 static void qbus_list_bus(DeviceState *dev)
 291 {
 292     BusState *child;
 293     const char *sep = " ";
 294
 295     error_printf("child busses at \"%s\":",
 296                  dev->id ? dev->id : object_get_typename(OBJECT(dev)));
 297     QLIST_FOREACH(child, &dev->child_bus, sibling) {
 298         error_printf("%s\"%s\"", sep, child->name);
 299         sep = ", ";
 300     }
 301     error_printf("\n");
 302 }
 303
 304 static void qbus_list_dev(BusState *bus)
 305 {
 306     BusChild *kid;
 307     const char *sep = " ";
 308
 309     error_printf("devices at \"%s\":", bus->name);
 310     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 311         DeviceState *dev = kid->child;
 312         error_printf("%s\"%s\"", sep, object_get_typename(OBJECT(dev)));
 313         if (dev->id)
 314             error_printf("/\"%s\"", dev->id);
 315         sep = ", ";
 316     }
 317     error_printf("\n");
 318 }
 319
 320 static BusState *qbus_find_bus(DeviceState *dev, char *elem)
 321 {
 322     BusState *child;
 323
 324     QLIST_FOREACH(child, &dev->child_bus, sibling) {
 325         if (strcmp(child->name, elem) == 0) {
 326             return child;
 327         }
 328     }
 329     return NULL;
 330 }
 331
 332 static DeviceState *qbus_find_dev(BusState *bus, char *elem)
 333 {
 334     BusChild *kid;
 335
 336     /*
 337      * try to match in order:
 338      *   (1) instance id, if present
 339      *   (2) driver name
 340      *   (3) driver alias, if present
 341      */
 342     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 343         DeviceState *dev = kid->child;
 344         if (dev->id  &&  strcmp(dev->id, elem) == 0) {
 345             return dev;
 346         }
 347     }
 348     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 349         DeviceState *dev = kid->child;
 350         if (strcmp(object_get_typename(OBJECT(dev)), elem) == 0) {
 351             return dev;
 352         }
 353     }
 354     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 355         DeviceState *dev = kid->child;
 356         DeviceClass *dc = DEVICE_GET_CLASS(dev);
 357
 358         if (qdev_class_has_alias(dc) &&
 359             strcmp(qdev_class_get_alias(dc), elem) == 0) {
 360             return dev;
 361         }
 362     }
 363     return NULL;
 364 }
 365
 366 static BusState *qbus_find_recursive(BusState *bus, const char *name,
 367                                      const char *bus_typename)
 368 {
 369     BusClass *bus_class = BUS_GET_CLASS(bus);
 370     BusChild *kid;
 371     BusState *child, *ret;
 372     int match = 1;
 373
 374     if (name && (strcmp(bus->name, name) != 0)) {
 375         match = 0;
 376     } else if (bus_typename && !object_dynamic_cast(OBJECT(bus), bus_typename)) {
 377         match = 0;
 378     } else if ((bus_class->max_dev != 0) && (bus_class->max_dev <= bus->max_index)) {
 379         if (name != NULL) {
 380             /* bus was explicitly specified: return an error. */
 381             qerror_report(ERROR_CLASS_GENERIC_ERROR, "Bus '%s' is full",
 382                           bus->name);
 383             return NULL;
 384         } else {
 385             /* bus was not specified: try to find another one. */
 386             match = 0;
 387         }
 388     }
 389     if (match) {
 390         return bus;
 391     }
 392
 393     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 394         DeviceState *dev = kid->child;
 395         QLIST_FOREACH(child, &dev->child_bus, sibling) {
 396             ret = qbus_find_recursive(child, name, bus_typename);
 397             if (ret) {
 398                 return ret;
 399             }
 400         }
 401     }
 402     return NULL;
 403 }
 404
 405 static BusState *qbus_find(const char *path)
 406 {
 407     DeviceState *dev;
 408     BusState *bus;
 409     char elem[128];
 410     int pos, len;
 411
 412     /* find start element */
 413     if (path[0] == '/') {
 414         bus = sysbus_get_default();
 415         pos = 0;
 416     } else {
 417         if (sscanf(path, "%127[^/]%n", elem, &len) != 1) {
 418             assert(!path[0]);
 419             elem[0] = len = 0;
 420         }
 421         bus = qbus_find_recursive(sysbus_get_default(), elem, NULL);
 422         if (!bus) {
 423             qerror_report(QERR_BUS_NOT_FOUND, elem);
 424             return NULL;
 425         }
 426         pos = len;
 427     }
 428
 429     for (;;) {
 430         assert(path[pos] == '/' || !path[pos]);
 431         while (path[pos] == '/') {
 432             pos++;
 433         }
 434         if (path[pos] == '\0') {
 435             return bus;
 436         }
 437
 438         /* find device */
 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         dev = qbus_find_dev(bus, elem);
 445         if (!dev) {
 446             qerror_report(QERR_DEVICE_NOT_FOUND, elem);
 447             if (!monitor_cur_is_qmp()) {
 448                 qbus_list_dev(bus);
 449             }
 450             return NULL;
 451         }
 452
 453         assert(path[pos] == '/' || !path[pos]);
 454         while (path[pos] == '/') {
 455             pos++;
 456         }
 457         if (path[pos] == '\0') {
 458             /* last specified element is a device.  If it has exactly
 459              * one child bus accept it nevertheless */
 460             switch (dev->num_child_bus) {
 461             case 0:
 462                 qerror_report(ERROR_CLASS_GENERIC_ERROR,
 463                               "Device '%s' has no child bus", elem);
 464                 return NULL;
 465             case 1:
 466                 return QLIST_FIRST(&dev->child_bus);
 467             default:
 468                 qerror_report(ERROR_CLASS_GENERIC_ERROR,
 469                               "Device '%s' has multiple child busses", elem);
 470                 if (!monitor_cur_is_qmp()) {
 471                     qbus_list_bus(dev);
 472                 }
 473                 return NULL;
 474             }
 475         }
 476
 477         /* find bus */
 478         if (sscanf(path+pos, "%127[^/]%n", elem, &len) != 1) {
 479             g_assert_not_reached();
 480             elem[0] = len = 0;
 481         }
 482         pos += len;
 483         bus = qbus_find_bus(dev, elem);
 484         if (!bus) {
 485             qerror_report(QERR_BUS_NOT_FOUND, elem);
 486             if (!monitor_cur_is_qmp()) {
 487                 qbus_list_bus(dev);
 488             }
 489             return NULL;
 490         }
 491     }
 492 }
 493
 494 DeviceState *qdev_device_add(QemuOpts *opts)
 495 {
 496     DeviceClass *dc;
 497     const char *driver, *path, *id;
 498     DeviceState *dev;
 499     BusState *bus = NULL;
 500     Error *err = NULL;
 501
 502     driver = qemu_opt_get(opts, "driver");
 503     if (!driver) {
 504         qerror_report(QERR_MISSING_PARAMETER, "driver");
 505         return NULL;
 506     }
 507
 508     /* find driver */
 509     dc = qdev_get_device_class(&driver, &err);
 510     if (err) {
 511         qerror_report_err(err);
 512         error_free(err);
 513         return NULL;
 514     }
 515
 516     /* find bus */
 517     path = qemu_opt_get(opts, "bus");
 518     if (path != NULL) {
 519         bus = qbus_find(path);
 520         if (!bus) {
 521             return NULL;
 522         }
 523         if (!object_dynamic_cast(OBJECT(bus), dc->bus_type)) {
 524             qerror_report(ERROR_CLASS_GENERIC_ERROR,
 525                           "Device '%s' can't go on a %s bus",
 526                           driver, object_get_typename(OBJECT(bus)));
 527             return NULL;
 528         }
 529     } else if (dc->bus_type != NULL) {
 530         bus = qbus_find_recursive(sysbus_get_default(), NULL, dc->bus_type);
 531         if (!bus) {
 532             qerror_report(ERROR_CLASS_GENERIC_ERROR,
 533                           "No '%s' bus found for device '%s'",
 534                           dc->bus_type, driver);
 535             return NULL;
 536         }
 537     }
 538     if (qdev_hotplug && bus && !qbus_is_hotpluggable(bus)) {
 539         qerror_report(QERR_BUS_NO_HOTPLUG, bus->name);
 540         return NULL;
 541     }
 542
 543     /* create device */
 544     dev = DEVICE(object_new(driver));
 545
 546     if (bus) {
 547         qdev_set_parent_bus(dev, bus);
 548     }
 549
 550     id = qemu_opts_id(opts);
 551     if (id) {
 552         dev->id = id;
 553     }
 554
 555     if (dev->id) {
 556         object_property_add_child(qdev_get_peripheral(), dev->id,
 557                                   OBJECT(dev), NULL);
 558     } else {
 559         static int anon_count;
 560         gchar *name = g_strdup_printf("device[%d]", anon_count++);
 561         object_property_add_child(qdev_get_peripheral_anon(), name,
 562                                   OBJECT(dev), NULL);
 563         g_free(name);
 564     }
 565
 566     /* set properties */
 567     if (qemu_opt_foreach(opts, set_property, dev, 1) != 0) {
 568         object_unparent(OBJECT(dev));
 569         object_unref(OBJECT(dev));
 570         return NULL;
 571     }
 572
 573     dev->opts = opts;
 574     object_property_set_bool(OBJECT(dev), true, "realized", &err);
 575     if (err != NULL) {
 576         qerror_report_err(err);
 577         error_free(err);
 578         dev->opts = NULL;
 579         object_unparent(OBJECT(dev));
 580         object_unref(OBJECT(dev));
 581         qerror_report(QERR_DEVICE_INIT_FAILED, driver);
 582         return NULL;
 583     }
 584     return dev;
 585 }
 586
 587
 588 #define qdev_printf(fmt, ...) monitor_printf(mon, "%*s" fmt, indent, "", ## __VA_ARGS__)
 589 static void qbus_print(Monitor *mon, BusState *bus, int indent);
 590
 591 static void qdev_print_props(Monitor *mon, DeviceState *dev, Property *props,
 592                              int indent)
 593 {
 594     if (!props)
 595         return;
 596     for (; props->name; props++) {
 597         Error *err = NULL;
 598         char *value;
 599         char *legacy_name = g_strdup_printf("legacy-%s", props->name);
 600         if (object_property_get_type(OBJECT(dev), legacy_name, NULL)) {
 601             value = object_property_get_str(OBJECT(dev), legacy_name, &err);
 602         } else {
 603             value = object_property_print(OBJECT(dev), props->name, true, &err);
 604         }
 605         g_free(legacy_name);
 606
 607         if (err) {
 608             error_free(err);
 609             continue;
 610         }
 611         qdev_printf("%s = %s\n", props->name,
 612                     value && *value ? value : "<null>");
 613         g_free(value);
 614     }
 615 }
 616
 617 static void bus_print_dev(BusState *bus, Monitor *mon, DeviceState *dev, int indent)
 618 {
 619     BusClass *bc = BUS_GET_CLASS(bus);
 620
 621     if (bc->print_dev) {
 622         bc->print_dev(mon, dev, indent);
 623     }
 624 }
 625
 626 static void qdev_print(Monitor *mon, DeviceState *dev, int indent)
 627 {
 628     ObjectClass *class;
 629     BusState *child;
 630     NamedGPIOList *ngl;
 631
 632     qdev_printf("dev: %s, id \"%s\"\n", object_get_typename(OBJECT(dev)),
 633                 dev->id ? dev->id : "");
 634     indent += 2;
 635     QLIST_FOREACH(ngl, &dev->gpios, node) {
 636         if (ngl->num_in) {
 637             qdev_printf("gpio-in \"%s\" %d\n", ngl->name ? ngl->name : "",
 638                         ngl->num_in);
 639         }
 640         if (ngl->num_out) {
 641             qdev_printf("gpio-out \"%s\" %d\n", ngl->name ? ngl->name : "",
 642                         ngl->num_out);
 643         }
 644     }
 645     class = object_get_class(OBJECT(dev));
 646     do {
 647         qdev_print_props(mon, dev, DEVICE_CLASS(class)->props, indent);
 648         class = object_class_get_parent(class);
 649     } while (class != object_class_by_name(TYPE_DEVICE));
 650     bus_print_dev(dev->parent_bus, mon, dev, indent);
 651     QLIST_FOREACH(child, &dev->child_bus, sibling) {
 652         qbus_print(mon, child, indent);
 653     }
 654 }
 655
 656 static void qbus_print(Monitor *mon, BusState *bus, int indent)
 657 {
 658     BusChild *kid;
 659
 660     qdev_printf("bus: %s\n", bus->name);
 661     indent += 2;
 662     qdev_printf("type %s\n", object_get_typename(OBJECT(bus)));
 663     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 664         DeviceState *dev = kid->child;
 665         qdev_print(mon, dev, indent);
 666     }
 667 }
 668 #undef qdev_printf
 669
 670 void do_info_qtree(Monitor *mon, const QDict *qdict)
 671 {
 672     if (sysbus_get_default())
 673         qbus_print(mon, sysbus_get_default(), 0);
 674 }
 675
 676 void do_info_qdm(Monitor *mon, const QDict *qdict)
 677 {
 678     qdev_print_devinfos(true);
 679 }
 680
 681 int do_device_add(Monitor *mon, const QDict *qdict, QObject **ret_data)
 682 {
 683     Error *local_err = NULL;
 684     QemuOpts *opts;
 685     DeviceState *dev;
 686
 687     opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict, &local_err);
 688     if (local_err) {
 689         qerror_report_err(local_err);
 690         error_free(local_err);
 691         return -1;
 692     }
 693     if (!monitor_cur_is_qmp() && qdev_device_help(opts)) {
 694         qemu_opts_del(opts);
 695         return 0;
 696     }
 697     dev = qdev_device_add(opts);
 698     if (!dev) {
 699         qemu_opts_del(opts);
 700         return -1;
 701     }
 702     object_unref(OBJECT(dev));
 703     return 0;
 704 }
 705
 706 void qmp_device_del(const char *id, Error **errp)
 707 {
 708     Object *obj;
 709     char *root_path = object_get_canonical_path(qdev_get_peripheral());
 710     char *path = g_strdup_printf("%s/%s", root_path, id);
 711
 712     g_free(root_path);
 713     obj = object_resolve_path_type(path, TYPE_DEVICE, NULL);
 714     g_free(path);
 715
 716     if (!obj) {
 717         error_set(errp, QERR_DEVICE_NOT_FOUND, id);
 718         return;
 719     }
 720
 721     qdev_unplug(DEVICE(obj), errp);
 722 }
 723
 724 void qdev_machine_init(void)
 725 {
 726     qdev_get_peripheral_anon();
 727     qdev_get_peripheral();
 728 }
 729
 730 QemuOptsList qemu_device_opts = {
 731     .name = "device",
 732     .implied_opt_name = "driver",
 733     .head = QTAILQ_HEAD_INITIALIZER(qemu_device_opts.head),
 734     .desc = {
 735         /*
 736          * no elements => accept any
 737          * sanity checking will happen later
 738          * when setting device properties
 739          */
 740         { /* end of list */ }
 741     },
 742 };
 743
 744 QemuOptsList qemu_global_opts = {
 745     .name = "global",
 746     .head = QTAILQ_HEAD_INITIALIZER(qemu_global_opts.head),
 747     .desc = {
 748         {
 749             .name = "driver",
 750             .type = QEMU_OPT_STRING,
 751         },{
 752             .name = "property",
 753             .type = QEMU_OPT_STRING,
 754         },{
 755             .name = "value",
 756             .type = QEMU_OPT_STRING,
 757         },
 758         { /* end of list */ }
 759     },
 760 };
 761
 762 int qemu_global_option(const char *str)
 763 {
 764     char driver[64], property[64];
 765     QemuOpts *opts;
 766     int rc, offset;
 767
 768     rc = sscanf(str, "%63[^.].%63[^=]%n", driver, property, &offset);
 769     if (rc < 2 || str[offset] != '=') {
 770         error_report("can't parse: \"%s\"", str);
 771         return -1;
 772     }
 773
 774     opts = qemu_opts_create(&qemu_global_opts, NULL, 0, &error_abort);
 775     qemu_opt_set(opts, "driver", driver);
 776     qemu_opt_set(opts, "property", property);
 777     qemu_opt_set(opts, "value", str+offset+1);
 778     return 0;
 779 }