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 "qemu/osdep.h"
  21 #include "hw/sysbus.h"
  22 #include "monitor/hmp.h"
  23 #include "monitor/monitor.h"
  24 #include "monitor/qdev.h"
  25 #include "sysemu/arch_init.h"
  26 #include "qapi/error.h"
  27 #include "qapi/qapi-commands-qdev.h"
  28 #include "qapi/qmp/qdict.h"
  29 #include "qapi/qmp/qerror.h"
  30 #include "qemu/config-file.h"
  31 #include "qemu/error-report.h"
  32 #include "qemu/help_option.h"
  33 #include "qemu/option.h"
  34 #include "qemu/qemu-print.h"
  35 #include "qemu/option_int.h"
  36 #include "sysemu/block-backend.h"
  37 #include "sysemu/sysemu.h"
  38 #include "migration/misc.h"
  39 #include "migration/migration.h"
  40 #include "qemu/cutils.h"
  41 #include "hw/clock.h"
  42
  43 /*
  44  * Aliases were a bad idea from the start.  Let's keep them
  45  * from spreading further.
  46  */
  47 typedef struct QDevAlias
  48 {
  49     const char *typename;
  50     const char *alias;
  51     uint32_t arch_mask;
  52 } QDevAlias;
  53
  54 /* Please keep this table sorted by typename. */
  55 static const QDevAlias qdev_alias_table[] = {
  56     { "AC97", "ac97" }, /* -soundhw name */
  57     { "e1000", "e1000-82540em" },
  58     { "ES1370", "es1370" }, /* -soundhw name */
  59     { "ich9-ahci", "ahci" },
  60     { "lsi53c895a", "lsi" },
  61     { "virtio-9p-ccw", "virtio-9p", QEMU_ARCH_S390X },
  62     { "virtio-9p-pci", "virtio-9p", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  63     { "virtio-balloon-ccw", "virtio-balloon", QEMU_ARCH_S390X },
  64     { "virtio-balloon-pci", "virtio-balloon",
  65             QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  66     { "virtio-blk-ccw", "virtio-blk", QEMU_ARCH_S390X },
  67     { "virtio-blk-pci", "virtio-blk", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  68     { "virtio-gpu-ccw", "virtio-gpu", QEMU_ARCH_S390X },
  69     { "virtio-gpu-pci", "virtio-gpu", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  70     { "virtio-input-host-ccw", "virtio-input-host", QEMU_ARCH_S390X },
  71     { "virtio-input-host-pci", "virtio-input-host",
  72             QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  73     { "virtio-iommu-pci", "virtio-iommu", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  74     { "virtio-keyboard-ccw", "virtio-keyboard", QEMU_ARCH_S390X },
  75     { "virtio-keyboard-pci", "virtio-keyboard",
  76             QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  77     { "virtio-mouse-ccw", "virtio-mouse", QEMU_ARCH_S390X },
  78     { "virtio-mouse-pci", "virtio-mouse", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  79     { "virtio-net-ccw", "virtio-net", QEMU_ARCH_S390X },
  80     { "virtio-net-pci", "virtio-net", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  81     { "virtio-rng-ccw", "virtio-rng", QEMU_ARCH_S390X },
  82     { "virtio-rng-pci", "virtio-rng", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  83     { "virtio-scsi-ccw", "virtio-scsi", QEMU_ARCH_S390X },
  84     { "virtio-scsi-pci", "virtio-scsi", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  85     { "virtio-serial-ccw", "virtio-serial", QEMU_ARCH_S390X },
  86     { "virtio-serial-pci", "virtio-serial", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  87     { "virtio-tablet-ccw", "virtio-tablet", QEMU_ARCH_S390X },
  88     { "virtio-tablet-pci", "virtio-tablet", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  89     { }
  90 };
  91
  92 static const char *qdev_class_get_alias(DeviceClass *dc)
  93 {
  94     const char *typename = object_class_get_name(OBJECT_CLASS(dc));
  95     int i;
  96
  97     for (i = 0; qdev_alias_table[i].typename; i++) {
  98         if (qdev_alias_table[i].arch_mask &&
  99             !(qdev_alias_table[i].arch_mask & arch_type)) {
 100             continue;
 101         }
 102
 103         if (strcmp(qdev_alias_table[i].typename, typename) == 0) {
 104             return qdev_alias_table[i].alias;
 105         }
 106     }
 107
 108     return NULL;
 109 }
 110
 111 static bool qdev_class_has_alias(DeviceClass *dc)
 112 {
 113     return (qdev_class_get_alias(dc) != NULL);
 114 }
 115
 116 static void qdev_print_devinfo(DeviceClass *dc)
 117 {
 118     qemu_printf("name \"%s\"", object_class_get_name(OBJECT_CLASS(dc)));
 119     if (dc->bus_type) {
 120         qemu_printf(", bus %s", dc->bus_type);
 121     }
 122     if (qdev_class_has_alias(dc)) {
 123         qemu_printf(", alias \"%s\"", qdev_class_get_alias(dc));
 124     }
 125     if (dc->desc) {
 126         qemu_printf(", desc \"%s\"", dc->desc);
 127     }
 128     if (!dc->user_creatable) {
 129         qemu_printf(", no-user");
 130     }
 131     qemu_printf("\n");
 132 }
 133
 134 static void qdev_print_devinfos(bool show_no_user)
 135 {
 136     static const char *cat_name[DEVICE_CATEGORY_MAX + 1] = {
 137         [DEVICE_CATEGORY_BRIDGE]  = "Controller/Bridge/Hub",
 138         [DEVICE_CATEGORY_USB]     = "USB",
 139         [DEVICE_CATEGORY_STORAGE] = "Storage",
 140         [DEVICE_CATEGORY_NETWORK] = "Network",
 141         [DEVICE_CATEGORY_INPUT]   = "Input",
 142         [DEVICE_CATEGORY_DISPLAY] = "Display",
 143         [DEVICE_CATEGORY_SOUND]   = "Sound",
 144         [DEVICE_CATEGORY_MISC]    = "Misc",
 145         [DEVICE_CATEGORY_CPU]     = "CPU",
 146         [DEVICE_CATEGORY_MAX]     = "Uncategorized",
 147     };
 148     GSList *list, *elt;
 149     int i;
 150     bool cat_printed;
 151
 152     module_load_qom_all();
 153     list = object_class_get_list_sorted(TYPE_DEVICE, false);
 154
 155     for (i = 0; i <= DEVICE_CATEGORY_MAX; i++) {
 156         cat_printed = false;
 157         for (elt = list; elt; elt = elt->next) {
 158             DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, elt->data,
 159                                                  TYPE_DEVICE);
 160             if ((i < DEVICE_CATEGORY_MAX
 161                  ? !test_bit(i, dc->categories)
 162                  : !bitmap_empty(dc->categories, DEVICE_CATEGORY_MAX))
 163                 || (!show_no_user
 164                     && !dc->user_creatable)) {
 165                 continue;
 166             }
 167             if (!cat_printed) {
 168                 qemu_printf("%s%s devices:\n", i ? "\n" : "", cat_name[i]);
 169                 cat_printed = true;
 170             }
 171             qdev_print_devinfo(dc);
 172         }
 173     }
 174
 175     g_slist_free(list);
 176 }
 177
 178 static int set_property(void *opaque, const char *name, const char *value,
 179                         Error **errp)
 180 {
 181     Object *obj = opaque;
 182     Error *err = NULL;
 183
 184     if (strcmp(name, "driver") == 0)
 185         return 0;
 186     if (strcmp(name, "bus") == 0)
 187         return 0;
 188
 189     object_property_parse(obj, value, name, &err);
 190     if (err != NULL) {
 191         error_propagate(errp, err);
 192         return -1;
 193     }
 194     return 0;
 195 }
 196
 197 static const char *find_typename_by_alias(const char *alias)
 198 {
 199     int i;
 200
 201     for (i = 0; qdev_alias_table[i].alias; i++) {
 202         if (qdev_alias_table[i].arch_mask &&
 203             !(qdev_alias_table[i].arch_mask & arch_type)) {
 204             continue;
 205         }
 206
 207         if (strcmp(qdev_alias_table[i].alias, alias) == 0) {
 208             return qdev_alias_table[i].typename;
 209         }
 210     }
 211
 212     return NULL;
 213 }
 214
 215 static DeviceClass *qdev_get_device_class(const char **driver, Error **errp)
 216 {
 217     ObjectClass *oc;
 218     DeviceClass *dc;
 219     const char *original_name = *driver;
 220
 221     oc = module_object_class_by_name(*driver);
 222     if (!oc) {
 223         const char *typename = find_typename_by_alias(*driver);
 224
 225         if (typename) {
 226             *driver = typename;
 227             oc = module_object_class_by_name(*driver);
 228         }
 229     }
 230
 231     if (!object_class_dynamic_cast(oc, TYPE_DEVICE)) {
 232         if (*driver != original_name) {
 233             error_setg(errp, "'%s' (alias '%s') is not a valid device model"
 234                        " name", original_name, *driver);
 235         } else {
 236             error_setg(errp, "'%s' is not a valid device model name", *driver);
 237         }
 238         return NULL;
 239     }
 240
 241     if (object_class_is_abstract(oc)) {
 242         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
 243                    "non-abstract device type");
 244         return NULL;
 245     }
 246
 247     dc = DEVICE_CLASS(oc);
 248     if (!dc->user_creatable ||
 249         (qdev_hotplug && !dc->hotpluggable)) {
 250         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
 251                    "pluggable device type");
 252         return NULL;
 253     }
 254
 255     return dc;
 256 }
 257
 258
 259 int qdev_device_help(QemuOpts *opts)
 260 {
 261     Error *local_err = NULL;
 262     const char *driver;
 263     ObjectPropertyInfoList *prop_list;
 264     ObjectPropertyInfoList *prop;
 265     GPtrArray *array;
 266     int i;
 267
 268     driver = qemu_opt_get(opts, "driver");
 269     if (driver && is_help_option(driver)) {
 270         qdev_print_devinfos(false);
 271         return 1;
 272     }
 273
 274     if (!driver || !qemu_opt_has_help_opt(opts)) {
 275         return 0;
 276     }
 277
 278     if (!object_class_by_name(driver)) {
 279         const char *typename = find_typename_by_alias(driver);
 280
 281         if (typename) {
 282             driver = typename;
 283         }
 284     }
 285
 286     prop_list = qmp_device_list_properties(driver, &local_err);
 287     if (local_err) {
 288         goto error;
 289     }
 290
 291     if (prop_list) {
 292         qemu_printf("%s options:\n", driver);
 293     } else {
 294         qemu_printf("There are no options for %s.\n", driver);
 295     }
 296     array = g_ptr_array_new();
 297     for (prop = prop_list; prop; prop = prop->next) {
 298         g_ptr_array_add(array,
 299                         object_property_help(prop->value->name,
 300                                              prop->value->type,
 301                                              prop->value->default_value,
 302                                              prop->value->description));
 303     }
 304     g_ptr_array_sort(array, (GCompareFunc)qemu_pstrcmp0);
 305     for (i = 0; i < array->len; i++) {
 306         printf("%s\n", (char *)array->pdata[i]);
 307     }
 308     g_ptr_array_set_free_func(array, g_free);
 309     g_ptr_array_free(array, true);
 310     qapi_free_ObjectPropertyInfoList(prop_list);
 311     return 1;
 312
 313 error:
 314     error_report_err(local_err);
 315     return 1;
 316 }
 317
 318 static Object *qdev_get_peripheral(void)
 319 {
 320     static Object *dev;
 321
 322     if (dev == NULL) {
 323         dev = container_get(qdev_get_machine(), "/peripheral");
 324     }
 325
 326     return dev;
 327 }
 328
 329 static Object *qdev_get_peripheral_anon(void)
 330 {
 331     static Object *dev;
 332
 333     if (dev == NULL) {
 334         dev = container_get(qdev_get_machine(), "/peripheral-anon");
 335     }
 336
 337     return dev;
 338 }
 339
 340 static void qbus_error_append_bus_list_hint(DeviceState *dev,
 341                                             Error *const *errp)
 342 {
 343     BusState *child;
 344     const char *sep = " ";
 345
 346     error_append_hint(errp, "child buses at \"%s\":",
 347                       dev->id ? dev->id : object_get_typename(OBJECT(dev)));
 348     QLIST_FOREACH(child, &dev->child_bus, sibling) {
 349         error_append_hint(errp, "%s\"%s\"", sep, child->name);
 350         sep = ", ";
 351     }
 352     error_append_hint(errp, "\n");
 353 }
 354
 355 static void qbus_error_append_dev_list_hint(BusState *bus,
 356                                             Error *const *errp)
 357 {
 358     BusChild *kid;
 359     const char *sep = " ";
 360
 361     error_append_hint(errp, "devices at \"%s\":", bus->name);
 362     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 363         DeviceState *dev = kid->child;
 364         error_append_hint(errp, "%s\"%s\"", sep,
 365                           object_get_typename(OBJECT(dev)));
 366         if (dev->id) {
 367             error_append_hint(errp, "/\"%s\"", dev->id);
 368         }
 369         sep = ", ";
 370     }
 371     error_append_hint(errp, "\n");
 372 }
 373
 374 static BusState *qbus_find_bus(DeviceState *dev, char *elem)
 375 {
 376     BusState *child;
 377
 378     QLIST_FOREACH(child, &dev->child_bus, sibling) {
 379         if (strcmp(child->name, elem) == 0) {
 380             return child;
 381         }
 382     }
 383     return NULL;
 384 }
 385
 386 static DeviceState *qbus_find_dev(BusState *bus, char *elem)
 387 {
 388     BusChild *kid;
 389
 390     /*
 391      * try to match in order:
 392      *   (1) instance id, if present
 393      *   (2) driver name
 394      *   (3) driver alias, if present
 395      */
 396     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 397         DeviceState *dev = kid->child;
 398         if (dev->id  &&  strcmp(dev->id, elem) == 0) {
 399             return dev;
 400         }
 401     }
 402     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 403         DeviceState *dev = kid->child;
 404         if (strcmp(object_get_typename(OBJECT(dev)), elem) == 0) {
 405             return dev;
 406         }
 407     }
 408     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 409         DeviceState *dev = kid->child;
 410         DeviceClass *dc = DEVICE_GET_CLASS(dev);
 411
 412         if (qdev_class_has_alias(dc) &&
 413             strcmp(qdev_class_get_alias(dc), elem) == 0) {
 414             return dev;
 415         }
 416     }
 417     return NULL;
 418 }
 419
 420 static inline bool qbus_is_full(BusState *bus)
 421 {
 422     BusClass *bus_class = BUS_GET_CLASS(bus);
 423     return bus_class->max_dev && bus->num_children >= bus_class->max_dev;
 424 }
 425
 426 /*
 427  * Search the tree rooted at @bus for a bus.
 428  * If @name, search for a bus with that name.  Note that bus names
 429  * need not be unique.  Yes, that's screwed up.
 430  * Else search for a bus that is a subtype of @bus_typename.
 431  * If more than one exists, prefer one that can take another device.
 432  * Return the bus if found, else %NULL.
 433  */
 434 static BusState *qbus_find_recursive(BusState *bus, const char *name,
 435                                      const char *bus_typename)
 436 {
 437     BusChild *kid;
 438     BusState *pick, *child, *ret;
 439     bool match;
 440
 441     assert(name || bus_typename);
 442     if (name) {
 443         match = !strcmp(bus->name, name);
 444     } else {
 445         match = !!object_dynamic_cast(OBJECT(bus), bus_typename);
 446     }
 447
 448     if (match && !qbus_is_full(bus)) {
 449         return bus;             /* root matches and isn't full */
 450     }
 451
 452     pick = match ? bus : NULL;
 453
 454     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 455         DeviceState *dev = kid->child;
 456         QLIST_FOREACH(child, &dev->child_bus, sibling) {
 457             ret = qbus_find_recursive(child, name, bus_typename);
 458             if (ret && !qbus_is_full(ret)) {
 459                 return ret;     /* a descendant matches and isn't full */
 460             }
 461             if (ret && !pick) {
 462                 pick = ret;
 463             }
 464         }
 465     }
 466
 467     /* root or a descendant matches, but is full */
 468     return pick;
 469 }
 470
 471 static BusState *qbus_find(const char *path, Error **errp)
 472 {
 473     DeviceState *dev;
 474     BusState *bus;
 475     char elem[128];
 476     int pos, len;
 477
 478     /* find start element */
 479     if (path[0] == '/') {
 480         bus = sysbus_get_default();
 481         pos = 0;
 482     } else {
 483         if (sscanf(path, "%127[^/]%n", elem, &len) != 1) {
 484             assert(!path[0]);
 485             elem[0] = len = 0;
 486         }
 487         bus = qbus_find_recursive(sysbus_get_default(), elem, NULL);
 488         if (!bus) {
 489             error_setg(errp, "Bus '%s' not found", elem);
 490             return NULL;
 491         }
 492         pos = len;
 493     }
 494
 495     for (;;) {
 496         assert(path[pos] == '/' || !path[pos]);
 497         while (path[pos] == '/') {
 498             pos++;
 499         }
 500         if (path[pos] == '\0') {
 501             break;
 502         }
 503
 504         /* find device */
 505         if (sscanf(path+pos, "%127[^/]%n", elem, &len) != 1) {
 506             g_assert_not_reached();
 507             elem[0] = len = 0;
 508         }
 509         pos += len;
 510         dev = qbus_find_dev(bus, elem);
 511         if (!dev) {
 512             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 513                       "Device '%s' not found", elem);
 514             qbus_error_append_dev_list_hint(bus, errp);
 515             return NULL;
 516         }
 517
 518         assert(path[pos] == '/' || !path[pos]);
 519         while (path[pos] == '/') {
 520             pos++;
 521         }
 522         if (path[pos] == '\0') {
 523             /* last specified element is a device.  If it has exactly
 524              * one child bus accept it nevertheless */
 525             if (dev->num_child_bus == 1) {
 526                 bus = QLIST_FIRST(&dev->child_bus);
 527                 break;
 528             }
 529             if (dev->num_child_bus) {
 530                 error_setg(errp, "Device '%s' has multiple child buses",
 531                            elem);
 532                 qbus_error_append_bus_list_hint(dev, errp);
 533             } else {
 534                 error_setg(errp, "Device '%s' has no child bus", elem);
 535             }
 536             return NULL;
 537         }
 538
 539         /* find bus */
 540         if (sscanf(path+pos, "%127[^/]%n", elem, &len) != 1) {
 541             g_assert_not_reached();
 542             elem[0] = len = 0;
 543         }
 544         pos += len;
 545         bus = qbus_find_bus(dev, elem);
 546         if (!bus) {
 547             error_setg(errp, "Bus '%s' not found", elem);
 548             qbus_error_append_bus_list_hint(dev, errp);
 549             return NULL;
 550         }
 551     }
 552
 553     if (qbus_is_full(bus)) {
 554         error_setg(errp, "Bus '%s' is full", path);
 555         return NULL;
 556     }
 557     return bus;
 558 }
 559
 560 void qdev_set_id(DeviceState *dev, const char *id)
 561 {
 562     if (id) {
 563         dev->id = id;
 564     }
 565
 566     if (dev->id) {
 567         object_property_add_child(qdev_get_peripheral(), dev->id,
 568                                   OBJECT(dev));
 569     } else {
 570         static int anon_count;
 571         gchar *name = g_strdup_printf("device[%d]", anon_count++);
 572         object_property_add_child(qdev_get_peripheral_anon(), name,
 573                                   OBJECT(dev));
 574         g_free(name);
 575     }
 576 }
 577
 578 static int is_failover_device(void *opaque, const char *name, const char *value,
 579                         Error **errp)
 580 {
 581     if (strcmp(name, "failover_pair_id") == 0) {
 582         QemuOpts *opts = (QemuOpts *)opaque;
 583
 584         if (qdev_should_hide_device(opts)) {
 585             return 1;
 586         }
 587     }
 588
 589     return 0;
 590 }
 591
 592 static bool should_hide_device(QemuOpts *opts)
 593 {
 594     if (qemu_opt_foreach(opts, is_failover_device, opts, NULL) == 0) {
 595         return false;
 596     }
 597     return true;
 598 }
 599
 600 DeviceState *qdev_device_add(QemuOpts *opts, Error **errp)
 601 {
 602     DeviceClass *dc;
 603     const char *driver, *path;
 604     DeviceState *dev = NULL;
 605     BusState *bus = NULL;
 606     Error *err = NULL;
 607     bool hide;
 608
 609     driver = qemu_opt_get(opts, "driver");
 610     if (!driver) {
 611         error_setg(errp, QERR_MISSING_PARAMETER, "driver");
 612         return NULL;
 613     }
 614
 615     /* find driver */
 616     dc = qdev_get_device_class(&driver, errp);
 617     if (!dc) {
 618         return NULL;
 619     }
 620
 621     /* find bus */
 622     path = qemu_opt_get(opts, "bus");
 623     if (path != NULL) {
 624         bus = qbus_find(path, errp);
 625         if (!bus) {
 626             return NULL;
 627         }
 628         if (!object_dynamic_cast(OBJECT(bus), dc->bus_type)) {
 629             error_setg(errp, "Device '%s' can't go on %s bus",
 630                        driver, object_get_typename(OBJECT(bus)));
 631             return NULL;
 632         }
 633     } else if (dc->bus_type != NULL) {
 634         bus = qbus_find_recursive(sysbus_get_default(), NULL, dc->bus_type);
 635         if (!bus || qbus_is_full(bus)) {
 636             error_setg(errp, "No '%s' bus found for device '%s'",
 637                        dc->bus_type, driver);
 638             return NULL;
 639         }
 640     }
 641     hide = should_hide_device(opts);
 642
 643     if ((hide || qdev_hotplug) && bus && !qbus_is_hotpluggable(bus)) {
 644         error_setg(errp, QERR_BUS_NO_HOTPLUG, bus->name);
 645         return NULL;
 646     }
 647
 648     if (hide) {
 649         return NULL;
 650     }
 651
 652     if (!migration_is_idle()) {
 653         error_setg(errp, "device_add not allowed while migrating");
 654         return NULL;
 655     }
 656
 657     /* create device */
 658     dev = qdev_new(driver);
 659
 660     /* Check whether the hotplug is allowed by the machine */
 661     if (qdev_hotplug && !qdev_hotplug_allowed(dev, &err)) {
 662         /* Error must be set in the machine hook */
 663         assert(err);
 664         goto err_del_dev;
 665     }
 666
 667     if (!bus && qdev_hotplug && !qdev_get_machine_hotplug_handler(dev)) {
 668         /* No bus, no machine hotplug handler --> device is not hotpluggable */
 669         error_setg(&err, "Device '%s' can not be hotplugged on this machine",
 670                    driver);
 671         goto err_del_dev;
 672     }
 673
 674     qdev_set_id(dev, qemu_opts_id(opts));
 675
 676     /* set properties */
 677     if (qemu_opt_foreach(opts, set_property, dev, &err)) {
 678         goto err_del_dev;
 679     }
 680
 681     dev->opts = opts;
 682     qdev_realize(DEVICE(dev), bus, &err);
 683     if (err != NULL) {
 684         dev->opts = NULL;
 685         goto err_del_dev;
 686     }
 687     return dev;
 688
 689 err_del_dev:
 690     error_propagate(errp, err);
 691     if (dev) {
 692         object_unparent(OBJECT(dev));
 693         object_unref(OBJECT(dev));
 694     }
 695     return NULL;
 696 }
 697
 698
 699 #define qdev_printf(fmt, ...) monitor_printf(mon, "%*s" fmt, indent, "", ## __VA_ARGS__)
 700 static void qbus_print(Monitor *mon, BusState *bus, int indent);
 701
 702 static void qdev_print_props(Monitor *mon, DeviceState *dev, Property *props,
 703                              int indent)
 704 {
 705     if (!props)
 706         return;
 707     for (; props->name; props++) {
 708         Error *err = NULL;
 709         char *value;
 710         char *legacy_name = g_strdup_printf("legacy-%s", props->name);
 711         if (object_property_get_type(OBJECT(dev), legacy_name, NULL)) {
 712             value = object_property_get_str(OBJECT(dev), legacy_name, &err);
 713         } else {
 714             value = object_property_print(OBJECT(dev), props->name, true, &err);
 715         }
 716         g_free(legacy_name);
 717
 718         if (err) {
 719             error_free(err);
 720             continue;
 721         }
 722         qdev_printf("%s = %s\n", props->name,
 723                     value && *value ? value : "<null>");
 724         g_free(value);
 725     }
 726 }
 727
 728 static void bus_print_dev(BusState *bus, Monitor *mon, DeviceState *dev, int indent)
 729 {
 730     BusClass *bc = BUS_GET_CLASS(bus);
 731
 732     if (bc->print_dev) {
 733         bc->print_dev(mon, dev, indent);
 734     }
 735 }
 736
 737 static void qdev_print(Monitor *mon, DeviceState *dev, int indent)
 738 {
 739     ObjectClass *class;
 740     BusState *child;
 741     NamedGPIOList *ngl;
 742     NamedClockList *ncl;
 743
 744     qdev_printf("dev: %s, id \"%s\"\n", object_get_typename(OBJECT(dev)),
 745                 dev->id ? dev->id : "");
 746     indent += 2;
 747     QLIST_FOREACH(ngl, &dev->gpios, node) {
 748         if (ngl->num_in) {
 749             qdev_printf("gpio-in \"%s\" %d\n", ngl->name ? ngl->name : "",
 750                         ngl->num_in);
 751         }
 752         if (ngl->num_out) {
 753             qdev_printf("gpio-out \"%s\" %d\n", ngl->name ? ngl->name : "",
 754                         ngl->num_out);
 755         }
 756     }
 757     QLIST_FOREACH(ncl, &dev->clocks, node) {
 758         qdev_printf("clock-%s%s \"%s\" freq_hz=%e\n",
 759                     ncl->output ? "out" : "in",
 760                     ncl->alias ? " (alias)" : "",
 761                     ncl->name,
 762                     CLOCK_PERIOD_TO_HZ(1.0 * clock_get(ncl->clock)));
 763     }
 764     class = object_get_class(OBJECT(dev));
 765     do {
 766         qdev_print_props(mon, dev, DEVICE_CLASS(class)->props_, indent);
 767         class = object_class_get_parent(class);
 768     } while (class != object_class_by_name(TYPE_DEVICE));
 769     bus_print_dev(dev->parent_bus, mon, dev, indent);
 770     QLIST_FOREACH(child, &dev->child_bus, sibling) {
 771         qbus_print(mon, child, indent);
 772     }
 773 }
 774
 775 static void qbus_print(Monitor *mon, BusState *bus, int indent)
 776 {
 777     BusChild *kid;
 778
 779     qdev_printf("bus: %s\n", bus->name);
 780     indent += 2;
 781     qdev_printf("type %s\n", object_get_typename(OBJECT(bus)));
 782     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 783         DeviceState *dev = kid->child;
 784         qdev_print(mon, dev, indent);
 785     }
 786 }
 787 #undef qdev_printf
 788
 789 void hmp_info_qtree(Monitor *mon, const QDict *qdict)
 790 {
 791     if (sysbus_get_default())
 792         qbus_print(mon, sysbus_get_default(), 0);
 793 }
 794
 795 void hmp_info_qdm(Monitor *mon, const QDict *qdict)
 796 {
 797     qdev_print_devinfos(true);
 798 }
 799
 800 void qmp_device_add(QDict *qdict, QObject **ret_data, Error **errp)
 801 {
 802     Error *local_err = NULL;
 803     QemuOpts *opts;
 804     DeviceState *dev;
 805
 806     opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict, &local_err);
 807     if (local_err) {
 808         error_propagate(errp, local_err);
 809         return;
 810     }
 811     if (!monitor_cur_is_qmp() && qdev_device_help(opts)) {
 812         qemu_opts_del(opts);
 813         return;
 814     }
 815     dev = qdev_device_add(opts, &local_err);
 816     if (!dev) {
 817         error_propagate(errp, local_err);
 818         qemu_opts_del(opts);
 819         return;
 820     }
 821     object_unref(OBJECT(dev));
 822 }
 823
 824 static DeviceState *find_device_state(const char *id, Error **errp)
 825 {
 826     Object *obj;
 827
 828     if (id[0] == '/') {
 829         obj = object_resolve_path(id, NULL);
 830     } else {
 831         char *root_path = object_get_canonical_path(qdev_get_peripheral());
 832         char *path = g_strdup_printf("%s/%s", root_path, id);
 833
 834         g_free(root_path);
 835         obj = object_resolve_path_type(path, TYPE_DEVICE, NULL);
 836         g_free(path);
 837     }
 838
 839     if (!obj) {
 840         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 841                   "Device '%s' not found", id);
 842         return NULL;
 843     }
 844
 845     if (!object_dynamic_cast(obj, TYPE_DEVICE)) {
 846         error_setg(errp, "%s is not a hotpluggable device", id);
 847         return NULL;
 848     }
 849
 850     return DEVICE(obj);
 851 }
 852
 853 void qdev_unplug(DeviceState *dev, Error **errp)
 854 {
 855     DeviceClass *dc = DEVICE_GET_CLASS(dev);
 856     HotplugHandler *hotplug_ctrl;
 857     HotplugHandlerClass *hdc;
 858     Error *local_err = NULL;
 859
 860     if (dev->parent_bus && !qbus_is_hotpluggable(dev->parent_bus)) {
 861         error_setg(errp, QERR_BUS_NO_HOTPLUG, dev->parent_bus->name);
 862         return;
 863     }
 864
 865     if (!dc->hotpluggable) {
 866         error_setg(errp, QERR_DEVICE_NO_HOTPLUG,
 867                    object_get_typename(OBJECT(dev)));
 868         return;
 869     }
 870
 871     if (!migration_is_idle() && !dev->allow_unplug_during_migration) {
 872         error_setg(errp, "device_del not allowed while migrating");
 873         return;
 874     }
 875
 876     qdev_hot_removed = true;
 877
 878     hotplug_ctrl = qdev_get_hotplug_handler(dev);
 879     /* hotpluggable device MUST have HotplugHandler, if it doesn't
 880      * then something is very wrong with it */
 881     g_assert(hotplug_ctrl);
 882
 883     /* If device supports async unplug just request it to be done,
 884      * otherwise just remove it synchronously */
 885     hdc = HOTPLUG_HANDLER_GET_CLASS(hotplug_ctrl);
 886     if (hdc->unplug_request) {
 887         hotplug_handler_unplug_request(hotplug_ctrl, dev, &local_err);
 888     } else {
 889         hotplug_handler_unplug(hotplug_ctrl, dev, &local_err);
 890         if (!local_err) {
 891             object_unparent(OBJECT(dev));
 892         }
 893     }
 894     error_propagate(errp, local_err);
 895 }
 896
 897 void qmp_device_del(const char *id, Error **errp)
 898 {
 899     DeviceState *dev = find_device_state(id, errp);
 900     if (dev != NULL) {
 901         if (dev->pending_deleted_event) {
 902             error_setg(errp, "Device %s is already in the "
 903                              "process of unplug", id);
 904             return;
 905         }
 906
 907         qdev_unplug(dev, errp);
 908     }
 909 }
 910
 911 void hmp_device_add(Monitor *mon, const QDict *qdict)
 912 {
 913     Error *err = NULL;
 914
 915     qmp_device_add((QDict *)qdict, NULL, &err);
 916     hmp_handle_error(mon, err);
 917 }
 918
 919 void hmp_device_del(Monitor *mon, const QDict *qdict)
 920 {
 921     const char *id = qdict_get_str(qdict, "id");
 922     Error *err = NULL;
 923
 924     qmp_device_del(id, &err);
 925     hmp_handle_error(mon, err);
 926 }
 927
 928 BlockBackend *blk_by_qdev_id(const char *id, Error **errp)
 929 {
 930     DeviceState *dev;
 931     BlockBackend *blk;
 932
 933     dev = find_device_state(id, errp);
 934     if (dev == NULL) {
 935         return NULL;
 936     }
 937
 938     blk = blk_by_dev(dev);
 939     if (!blk) {
 940         error_setg(errp, "Device does not have a block device backend");
 941     }
 942     return blk;
 943 }
 944
 945 void qdev_machine_init(void)
 946 {
 947     qdev_get_peripheral_anon();
 948     qdev_get_peripheral();
 949 }
 950
 951 QemuOptsList qemu_device_opts = {
 952     .name = "device",
 953     .implied_opt_name = "driver",
 954     .head = QTAILQ_HEAD_INITIALIZER(qemu_device_opts.head),
 955     .desc = {
 956         /*
 957          * no elements => accept any
 958          * sanity checking will happen later
 959          * when setting device properties
 960          */
 961         { /* end of list */ }
 962     },
 963 };
 964
 965 QemuOptsList qemu_global_opts = {
 966     .name = "global",
 967     .head = QTAILQ_HEAD_INITIALIZER(qemu_global_opts.head),
 968     .desc = {
 969         {
 970             .name = "driver",
 971             .type = QEMU_OPT_STRING,
 972         },{
 973             .name = "property",
 974             .type = QEMU_OPT_STRING,
 975         },{
 976             .name = "value",
 977             .type = QEMU_OPT_STRING,
 978         },
 979         { /* end of list */ }
 980     },
 981 };
 982
 983 int qemu_global_option(const char *str)
 984 {
 985     char driver[64], property[64];
 986     QemuOpts *opts;
 987     int rc, offset;
 988
 989     rc = sscanf(str, "%63[^.=].%63[^=]%n", driver, property, &offset);
 990     if (rc == 2 && str[offset] == '=') {
 991         opts = qemu_opts_create(&qemu_global_opts, NULL, 0, &error_abort);
 992         qemu_opt_set(opts, "driver", driver, &error_abort);
 993         qemu_opt_set(opts, "property", property, &error_abort);
 994         qemu_opt_set(opts, "value", str + offset + 1, &error_abort);
 995         return 0;
 996     }
 997
 998     opts = qemu_opts_parse_noisily(&qemu_global_opts, str, false);
 999     if (!opts) {
1000         return -1;
1001     }
1002
1003     return 0;
1004 }