softmmu/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 2.1 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/dispatch.h"
  29 #include "qapi/qmp/qdict.h"
  30 #include "qapi/qmp/qerror.h"
  31 #include "qapi/qmp/qstring.h"
  32 #include "qapi/qobject-input-visitor.h"
  33 #include "qemu/config-file.h"
  34 #include "qemu/error-report.h"
  35 #include "qemu/help_option.h"
  36 #include "qemu/option.h"
  37 #include "qemu/qemu-print.h"
  38 #include "qemu/option_int.h"
  39 #include "sysemu/block-backend.h"
  40 #include "migration/misc.h"
  41 #include "migration/migration.h"
  42 #include "qemu/cutils.h"
  43 #include "hw/qdev-properties.h"
  44 #include "hw/clock.h"
  45
  46 /*
  47  * Aliases were a bad idea from the start.  Let's keep them
  48  * from spreading further.
  49  */
  50 typedef struct QDevAlias
  51 {
  52     const char *typename;
  53     const char *alias;
  54     uint32_t arch_mask;
  55 } QDevAlias;
  56
  57 /* default virtio transport per architecture */
  58 #define QEMU_ARCH_VIRTIO_PCI (QEMU_ARCH_ALPHA | QEMU_ARCH_ARM | \
  59                               QEMU_ARCH_HPPA | QEMU_ARCH_I386 | \
  60                               QEMU_ARCH_MIPS | QEMU_ARCH_PPC |  \
  61                               QEMU_ARCH_RISCV | QEMU_ARCH_SH4 | \
  62                               QEMU_ARCH_SPARC | QEMU_ARCH_XTENSA)
  63 #define QEMU_ARCH_VIRTIO_CCW (QEMU_ARCH_S390X)
  64 #define QEMU_ARCH_VIRTIO_MMIO (QEMU_ARCH_M68K)
  65
  66 /* Please keep this table sorted by typename. */
  67 static const QDevAlias qdev_alias_table[] = {
  68     { "AC97", "ac97" }, /* -soundhw name */
  69     { "e1000", "e1000-82540em" },
  70     { "ES1370", "es1370" }, /* -soundhw name */
  71     { "ich9-ahci", "ahci" },
  72     { "lsi53c895a", "lsi" },
  73     { "virtio-9p-device", "virtio-9p", QEMU_ARCH_VIRTIO_MMIO },
  74     { "virtio-9p-ccw", "virtio-9p", QEMU_ARCH_VIRTIO_CCW },
  75     { "virtio-9p-pci", "virtio-9p", QEMU_ARCH_VIRTIO_PCI },
  76     { "virtio-balloon-device", "virtio-balloon", QEMU_ARCH_VIRTIO_MMIO },
  77     { "virtio-balloon-ccw", "virtio-balloon", QEMU_ARCH_VIRTIO_CCW },
  78     { "virtio-balloon-pci", "virtio-balloon", QEMU_ARCH_VIRTIO_PCI },
  79     { "virtio-blk-device", "virtio-blk", QEMU_ARCH_VIRTIO_MMIO },
  80     { "virtio-blk-ccw", "virtio-blk", QEMU_ARCH_VIRTIO_CCW },
  81     { "virtio-blk-pci", "virtio-blk", QEMU_ARCH_VIRTIO_PCI },
  82     { "virtio-gpu-device", "virtio-gpu", QEMU_ARCH_VIRTIO_MMIO },
  83     { "virtio-gpu-ccw", "virtio-gpu", QEMU_ARCH_VIRTIO_CCW },
  84     { "virtio-gpu-pci", "virtio-gpu", QEMU_ARCH_VIRTIO_PCI },
  85     { "virtio-input-host-device", "virtio-input-host", QEMU_ARCH_VIRTIO_MMIO },
  86     { "virtio-input-host-ccw", "virtio-input-host", QEMU_ARCH_VIRTIO_CCW },
  87     { "virtio-input-host-pci", "virtio-input-host", QEMU_ARCH_VIRTIO_PCI },
  88     { "virtio-iommu-pci", "virtio-iommu", QEMU_ARCH_VIRTIO_PCI },
  89     { "virtio-keyboard-device", "virtio-keyboard", QEMU_ARCH_VIRTIO_MMIO },
  90     { "virtio-keyboard-ccw", "virtio-keyboard", QEMU_ARCH_VIRTIO_CCW },
  91     { "virtio-keyboard-pci", "virtio-keyboard", QEMU_ARCH_VIRTIO_PCI },
  92     { "virtio-mouse-device", "virtio-mouse", QEMU_ARCH_VIRTIO_MMIO },
  93     { "virtio-mouse-ccw", "virtio-mouse", QEMU_ARCH_VIRTIO_CCW },
  94     { "virtio-mouse-pci", "virtio-mouse", QEMU_ARCH_VIRTIO_PCI },
  95     { "virtio-net-device", "virtio-net", QEMU_ARCH_VIRTIO_MMIO },
  96     { "virtio-net-ccw", "virtio-net", QEMU_ARCH_VIRTIO_CCW },
  97     { "virtio-net-pci", "virtio-net", QEMU_ARCH_VIRTIO_PCI },
  98     { "virtio-rng-device", "virtio-rng", QEMU_ARCH_VIRTIO_MMIO },
  99     { "virtio-rng-ccw", "virtio-rng", QEMU_ARCH_VIRTIO_CCW },
 100     { "virtio-rng-pci", "virtio-rng", QEMU_ARCH_VIRTIO_PCI },
 101     { "virtio-scsi-device", "virtio-scsi", QEMU_ARCH_VIRTIO_MMIO },
 102     { "virtio-scsi-ccw", "virtio-scsi", QEMU_ARCH_VIRTIO_CCW },
 103     { "virtio-scsi-pci", "virtio-scsi", QEMU_ARCH_VIRTIO_PCI },
 104     { "virtio-serial-device", "virtio-serial", QEMU_ARCH_VIRTIO_MMIO },
 105     { "virtio-serial-ccw", "virtio-serial", QEMU_ARCH_VIRTIO_CCW },
 106     { "virtio-serial-pci", "virtio-serial", QEMU_ARCH_VIRTIO_PCI},
 107     { "virtio-tablet-device", "virtio-tablet", QEMU_ARCH_VIRTIO_MMIO },
 108     { "virtio-tablet-ccw", "virtio-tablet", QEMU_ARCH_VIRTIO_CCW },
 109     { "virtio-tablet-pci", "virtio-tablet", QEMU_ARCH_VIRTIO_PCI },
 110     { }
 111 };
 112
 113 static const char *qdev_class_get_alias(DeviceClass *dc)
 114 {
 115     const char *typename = object_class_get_name(OBJECT_CLASS(dc));
 116     int i;
 117
 118     for (i = 0; qdev_alias_table[i].typename; i++) {
 119         if (qdev_alias_table[i].arch_mask &&
 120             !(qdev_alias_table[i].arch_mask & arch_type)) {
 121             continue;
 122         }
 123
 124         if (strcmp(qdev_alias_table[i].typename, typename) == 0) {
 125             return qdev_alias_table[i].alias;
 126         }
 127     }
 128
 129     return NULL;
 130 }
 131
 132 static bool qdev_class_has_alias(DeviceClass *dc)
 133 {
 134     return (qdev_class_get_alias(dc) != NULL);
 135 }
 136
 137 static void qdev_print_devinfo(DeviceClass *dc)
 138 {
 139     qemu_printf("name \"%s\"", object_class_get_name(OBJECT_CLASS(dc)));
 140     if (dc->bus_type) {
 141         qemu_printf(", bus %s", dc->bus_type);
 142     }
 143     if (qdev_class_has_alias(dc)) {
 144         qemu_printf(", alias \"%s\"", qdev_class_get_alias(dc));
 145     }
 146     if (dc->desc) {
 147         qemu_printf(", desc \"%s\"", dc->desc);
 148     }
 149     if (!dc->user_creatable) {
 150         qemu_printf(", no-user");
 151     }
 152     qemu_printf("\n");
 153 }
 154
 155 static void qdev_print_devinfos(bool show_no_user)
 156 {
 157     static const char *cat_name[DEVICE_CATEGORY_MAX + 1] = {
 158         [DEVICE_CATEGORY_BRIDGE]  = "Controller/Bridge/Hub",
 159         [DEVICE_CATEGORY_USB]     = "USB",
 160         [DEVICE_CATEGORY_STORAGE] = "Storage",
 161         [DEVICE_CATEGORY_NETWORK] = "Network",
 162         [DEVICE_CATEGORY_INPUT]   = "Input",
 163         [DEVICE_CATEGORY_DISPLAY] = "Display",
 164         [DEVICE_CATEGORY_SOUND]   = "Sound",
 165         [DEVICE_CATEGORY_MISC]    = "Misc",
 166         [DEVICE_CATEGORY_CPU]     = "CPU",
 167         [DEVICE_CATEGORY_MAX]     = "Uncategorized",
 168     };
 169     GSList *list, *elt;
 170     int i;
 171     bool cat_printed;
 172
 173     module_load_qom_all();
 174     list = object_class_get_list_sorted(TYPE_DEVICE, false);
 175
 176     for (i = 0; i <= DEVICE_CATEGORY_MAX; i++) {
 177         cat_printed = false;
 178         for (elt = list; elt; elt = elt->next) {
 179             DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, elt->data,
 180                                                  TYPE_DEVICE);
 181             if ((i < DEVICE_CATEGORY_MAX
 182                  ? !test_bit(i, dc->categories)
 183                  : !bitmap_empty(dc->categories, DEVICE_CATEGORY_MAX))
 184                 || (!show_no_user
 185                     && !dc->user_creatable)) {
 186                 continue;
 187             }
 188             if (!cat_printed) {
 189                 qemu_printf("%s%s devices:\n", i ? "\n" : "", cat_name[i]);
 190                 cat_printed = true;
 191             }
 192             qdev_print_devinfo(dc);
 193         }
 194     }
 195
 196     g_slist_free(list);
 197 }
 198
 199 static const char *find_typename_by_alias(const char *alias)
 200 {
 201     int i;
 202
 203     for (i = 0; qdev_alias_table[i].alias; i++) {
 204         if (qdev_alias_table[i].arch_mask &&
 205             !(qdev_alias_table[i].arch_mask & arch_type)) {
 206             continue;
 207         }
 208
 209         if (strcmp(qdev_alias_table[i].alias, alias) == 0) {
 210             return qdev_alias_table[i].typename;
 211         }
 212     }
 213
 214     return NULL;
 215 }
 216
 217 static DeviceClass *qdev_get_device_class(const char **driver, Error **errp)
 218 {
 219     ObjectClass *oc;
 220     DeviceClass *dc;
 221     const char *original_name = *driver;
 222
 223     oc = module_object_class_by_name(*driver);
 224     if (!oc) {
 225         const char *typename = find_typename_by_alias(*driver);
 226
 227         if (typename) {
 228             *driver = typename;
 229             oc = module_object_class_by_name(*driver);
 230         }
 231     }
 232
 233     if (!object_class_dynamic_cast(oc, TYPE_DEVICE)) {
 234         if (*driver != original_name) {
 235             error_setg(errp, "'%s' (alias '%s') is not a valid device model"
 236                        " name", original_name, *driver);
 237         } else {
 238             error_setg(errp, "'%s' is not a valid device model name", *driver);
 239         }
 240         return NULL;
 241     }
 242
 243     if (object_class_is_abstract(oc)) {
 244         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
 245                    "a non-abstract device type");
 246         return NULL;
 247     }
 248
 249     dc = DEVICE_CLASS(oc);
 250     if (!dc->user_creatable ||
 251         (phase_check(PHASE_MACHINE_READY) && !dc->hotpluggable)) {
 252         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
 253                    "a pluggable device type");
 254         return NULL;
 255     }
 256
 257     return dc;
 258 }
 259
 260
 261 int qdev_device_help(QemuOpts *opts)
 262 {
 263     Error *local_err = NULL;
 264     const char *driver;
 265     ObjectPropertyInfoList *prop_list;
 266     ObjectPropertyInfoList *prop;
 267     GPtrArray *array;
 268     int i;
 269
 270     driver = qemu_opt_get(opts, "driver");
 271     if (driver && is_help_option(driver)) {
 272         qdev_print_devinfos(false);
 273         return 1;
 274     }
 275
 276     if (!driver || !qemu_opt_has_help_opt(opts)) {
 277         return 0;
 278     }
 279
 280     if (!object_class_by_name(driver)) {
 281         const char *typename = find_typename_by_alias(driver);
 282
 283         if (typename) {
 284             driver = typename;
 285         }
 286     }
 287
 288     prop_list = qmp_device_list_properties(driver, &local_err);
 289     if (local_err) {
 290         goto error;
 291     }
 292
 293     if (prop_list) {
 294         qemu_printf("%s options:\n", driver);
 295     } else {
 296         qemu_printf("There are no options for %s.\n", driver);
 297     }
 298     array = g_ptr_array_new();
 299     for (prop = prop_list; prop; prop = prop->next) {
 300         g_ptr_array_add(array,
 301                         object_property_help(prop->value->name,
 302                                              prop->value->type,
 303                                              prop->value->default_value,
 304                                              prop->value->description));
 305     }
 306     g_ptr_array_sort(array, (GCompareFunc)qemu_pstrcmp0);
 307     for (i = 0; i < array->len; i++) {
 308         qemu_printf("%s\n", (char *)array->pdata[i]);
 309     }
 310     g_ptr_array_set_free_func(array, g_free);
 311     g_ptr_array_free(array, true);
 312     qapi_free_ObjectPropertyInfoList(prop_list);
 313     return 1;
 314
 315 error:
 316     error_report_err(local_err);
 317     return 1;
 318 }
 319
 320 static Object *qdev_get_peripheral(void)
 321 {
 322     static Object *dev;
 323
 324     if (dev == NULL) {
 325         dev = container_get(qdev_get_machine(), "/peripheral");
 326     }
 327
 328     return dev;
 329 }
 330
 331 static Object *qdev_get_peripheral_anon(void)
 332 {
 333     static Object *dev;
 334
 335     if (dev == NULL) {
 336         dev = container_get(qdev_get_machine(), "/peripheral-anon");
 337     }
 338
 339     return dev;
 340 }
 341
 342 static void qbus_error_append_bus_list_hint(DeviceState *dev,
 343                                             Error *const *errp)
 344 {
 345     BusState *child;
 346     const char *sep = " ";
 347
 348     error_append_hint(errp, "child buses at \"%s\":",
 349                       dev->id ? dev->id : object_get_typename(OBJECT(dev)));
 350     QLIST_FOREACH(child, &dev->child_bus, sibling) {
 351         error_append_hint(errp, "%s\"%s\"", sep, child->name);
 352         sep = ", ";
 353     }
 354     error_append_hint(errp, "\n");
 355 }
 356
 357 static void qbus_error_append_dev_list_hint(BusState *bus,
 358                                             Error *const *errp)
 359 {
 360     BusChild *kid;
 361     const char *sep = " ";
 362
 363     error_append_hint(errp, "devices at \"%s\":", bus->name);
 364     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 365         DeviceState *dev = kid->child;
 366         error_append_hint(errp, "%s\"%s\"", sep,
 367                           object_get_typename(OBJECT(dev)));
 368         if (dev->id) {
 369             error_append_hint(errp, "/\"%s\"", dev->id);
 370         }
 371         sep = ", ";
 372     }
 373     error_append_hint(errp, "\n");
 374 }
 375
 376 static BusState *qbus_find_bus(DeviceState *dev, char *elem)
 377 {
 378     BusState *child;
 379
 380     QLIST_FOREACH(child, &dev->child_bus, sibling) {
 381         if (strcmp(child->name, elem) == 0) {
 382             return child;
 383         }
 384     }
 385     return NULL;
 386 }
 387
 388 static DeviceState *qbus_find_dev(BusState *bus, char *elem)
 389 {
 390     BusChild *kid;
 391
 392     /*
 393      * try to match in order:
 394      *   (1) instance id, if present
 395      *   (2) driver name
 396      *   (3) driver alias, if present
 397      */
 398     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 399         DeviceState *dev = kid->child;
 400         if (dev->id  &&  strcmp(dev->id, elem) == 0) {
 401             return dev;
 402         }
 403     }
 404     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 405         DeviceState *dev = kid->child;
 406         if (strcmp(object_get_typename(OBJECT(dev)), elem) == 0) {
 407             return dev;
 408         }
 409     }
 410     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 411         DeviceState *dev = kid->child;
 412         DeviceClass *dc = DEVICE_GET_CLASS(dev);
 413
 414         if (qdev_class_has_alias(dc) &&
 415             strcmp(qdev_class_get_alias(dc), elem) == 0) {
 416             return dev;
 417         }
 418     }
 419     return NULL;
 420 }
 421
 422 static inline bool qbus_is_full(BusState *bus)
 423 {
 424     BusClass *bus_class;
 425
 426     if (bus->full) {
 427         return true;
 428     }
 429     bus_class = BUS_GET_CLASS(bus);
 430     return bus_class->max_dev && bus->num_children >= bus_class->max_dev;
 431 }
 432
 433 /*
 434  * Search the tree rooted at @bus for a bus.
 435  * If @name, search for a bus with that name.  Note that bus names
 436  * need not be unique.  Yes, that's screwed up.
 437  * Else search for a bus that is a subtype of @bus_typename.
 438  * If more than one exists, prefer one that can take another device.
 439  * Return the bus if found, else %NULL.
 440  */
 441 static BusState *qbus_find_recursive(BusState *bus, const char *name,
 442                                      const char *bus_typename)
 443 {
 444     BusChild *kid;
 445     BusState *pick, *child, *ret;
 446     bool match;
 447
 448     assert(name || bus_typename);
 449     if (name) {
 450         match = !strcmp(bus->name, name);
 451     } else {
 452         match = !!object_dynamic_cast(OBJECT(bus), bus_typename);
 453     }
 454
 455     if (match && !qbus_is_full(bus)) {
 456         return bus;             /* root matches and isn't full */
 457     }
 458
 459     pick = match ? bus : NULL;
 460
 461     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 462         DeviceState *dev = kid->child;
 463         QLIST_FOREACH(child, &dev->child_bus, sibling) {
 464             ret = qbus_find_recursive(child, name, bus_typename);
 465             if (ret && !qbus_is_full(ret)) {
 466                 return ret;     /* a descendant matches and isn't full */
 467             }
 468             if (ret && !pick) {
 469                 pick = ret;
 470             }
 471         }
 472     }
 473
 474     /* root or a descendant matches, but is full */
 475     return pick;
 476 }
 477
 478 static BusState *qbus_find(const char *path, Error **errp)
 479 {
 480     DeviceState *dev;
 481     BusState *bus;
 482     char elem[128];
 483     int pos, len;
 484
 485     /* find start element */
 486     if (path[0] == '/') {
 487         bus = sysbus_get_default();
 488         pos = 0;
 489     } else {
 490         if (sscanf(path, "%127[^/]%n", elem, &len) != 1) {
 491             assert(!path[0]);
 492             elem[0] = len = 0;
 493         }
 494         bus = qbus_find_recursive(sysbus_get_default(), elem, NULL);
 495         if (!bus) {
 496             error_setg(errp, "Bus '%s' not found", elem);
 497             return NULL;
 498         }
 499         pos = len;
 500     }
 501
 502     for (;;) {
 503         assert(path[pos] == '/' || !path[pos]);
 504         while (path[pos] == '/') {
 505             pos++;
 506         }
 507         if (path[pos] == '\0') {
 508             break;
 509         }
 510
 511         /* find device */
 512         if (sscanf(path+pos, "%127[^/]%n", elem, &len) != 1) {
 513             g_assert_not_reached();
 514             elem[0] = len = 0;
 515         }
 516         pos += len;
 517         dev = qbus_find_dev(bus, elem);
 518         if (!dev) {
 519             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 520                       "Device '%s' not found", elem);
 521             qbus_error_append_dev_list_hint(bus, errp);
 522             return NULL;
 523         }
 524
 525         assert(path[pos] == '/' || !path[pos]);
 526         while (path[pos] == '/') {
 527             pos++;
 528         }
 529         if (path[pos] == '\0') {
 530             /* last specified element is a device.  If it has exactly
 531              * one child bus accept it nevertheless */
 532             if (dev->num_child_bus == 1) {
 533                 bus = QLIST_FIRST(&dev->child_bus);
 534                 break;
 535             }
 536             if (dev->num_child_bus) {
 537                 error_setg(errp, "Device '%s' has multiple child buses",
 538                            elem);
 539                 qbus_error_append_bus_list_hint(dev, errp);
 540             } else {
 541                 error_setg(errp, "Device '%s' has no child bus", elem);
 542             }
 543             return NULL;
 544         }
 545
 546         /* find bus */
 547         if (sscanf(path+pos, "%127[^/]%n", elem, &len) != 1) {
 548             g_assert_not_reached();
 549             elem[0] = len = 0;
 550         }
 551         pos += len;
 552         bus = qbus_find_bus(dev, elem);
 553         if (!bus) {
 554             error_setg(errp, "Bus '%s' not found", elem);
 555             qbus_error_append_bus_list_hint(dev, errp);
 556             return NULL;
 557         }
 558     }
 559
 560     if (qbus_is_full(bus)) {
 561         error_setg(errp, "Bus '%s' is full", path);
 562         return NULL;
 563     }
 564     return bus;
 565 }
 566
 567 /* Takes ownership of @id, will be freed when deleting the device */
 568 const char *qdev_set_id(DeviceState *dev, char *id, Error **errp)
 569 {
 570     ObjectProperty *prop;
 571
 572     assert(!dev->id && !dev->realized);
 573
 574     /*
 575      * object_property_[try_]add_child() below will assert the device
 576      * has no parent
 577      */
 578     if (id) {
 579         prop = object_property_try_add_child(qdev_get_peripheral(), id,
 580                                              OBJECT(dev), NULL);
 581         if (prop) {
 582             dev->id = id;
 583         } else {
 584             g_free(id);
 585             error_setg(errp, "Duplicate device ID '%s'", id);
 586             return NULL;
 587         }
 588     } else {
 589         static int anon_count;
 590         gchar *name = g_strdup_printf("device[%d]", anon_count++);
 591         prop = object_property_add_child(qdev_get_peripheral_anon(), name,
 592                                          OBJECT(dev));
 593         g_free(name);
 594     }
 595
 596     return prop->name;
 597 }
 598
 599 DeviceState *qdev_device_add_from_qdict(const QDict *opts,
 600                                         bool from_json, Error **errp)
 601 {
 602     ERRP_GUARD();
 603     DeviceClass *dc;
 604     const char *driver, *path;
 605     char *id;
 606     DeviceState *dev = NULL;
 607     BusState *bus = NULL;
 608
 609     driver = qdict_get_try_str(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 = qdict_get_try_str(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
 642     if (qdev_should_hide_device(opts, from_json, errp)) {
 643         if (bus && !qbus_is_hotpluggable(bus)) {
 644             error_setg(errp, QERR_BUS_NO_HOTPLUG, bus->name);
 645         }
 646         return NULL;
 647     } else if (*errp) {
 648         return NULL;
 649     }
 650
 651     if (phase_check(PHASE_MACHINE_READY) && bus && !qbus_is_hotpluggable(bus)) {
 652         error_setg(errp, QERR_BUS_NO_HOTPLUG, bus->name);
 653         return NULL;
 654     }
 655
 656     if (!migration_is_idle()) {
 657         error_setg(errp, "device_add not allowed while migrating");
 658         return NULL;
 659     }
 660
 661     /* create device */
 662     dev = qdev_new(driver);
 663
 664     /* Check whether the hotplug is allowed by the machine */
 665     if (phase_check(PHASE_MACHINE_READY)) {
 666         if (!qdev_hotplug_allowed(dev, errp)) {
 667             goto err_del_dev;
 668         }
 669
 670         if (!bus && !qdev_get_machine_hotplug_handler(dev)) {
 671             /* No bus, no machine hotplug handler --> device is not hotpluggable */
 672             error_setg(errp, "Device '%s' can not be hotplugged on this machine",
 673                        driver);
 674             goto err_del_dev;
 675         }
 676     }
 677
 678     /*
 679      * set dev's parent and register its id.
 680      * If it fails it means the id is already taken.
 681      */
 682     id = g_strdup(qdict_get_try_str(opts, "id"));
 683     if (!qdev_set_id(dev, id, errp)) {
 684         goto err_del_dev;
 685     }
 686
 687     /* set properties */
 688     dev->opts = qdict_clone_shallow(opts);
 689     qdict_del(dev->opts, "driver");
 690     qdict_del(dev->opts, "bus");
 691     qdict_del(dev->opts, "id");
 692
 693     object_set_properties_from_keyval(&dev->parent_obj, dev->opts, from_json,
 694                                       errp);
 695     if (*errp) {
 696         goto err_del_dev;
 697     }
 698
 699     if (!qdev_realize(DEVICE(dev), bus, errp)) {
 700         goto err_del_dev;
 701     }
 702     return dev;
 703
 704 err_del_dev:
 705     if (dev) {
 706         object_unparent(OBJECT(dev));
 707         object_unref(OBJECT(dev));
 708     }
 709     return NULL;
 710 }
 711
 712 /* Takes ownership of @opts on success */
 713 DeviceState *qdev_device_add(QemuOpts *opts, Error **errp)
 714 {
 715     QDict *qdict = qemu_opts_to_qdict(opts, NULL);
 716     DeviceState *ret;
 717
 718     ret = qdev_device_add_from_qdict(qdict, false, errp);
 719     if (ret) {
 720         qemu_opts_del(opts);
 721     }
 722     qobject_unref(qdict);
 723     return ret;
 724 }
 725
 726 #define qdev_printf(fmt, ...) monitor_printf(mon, "%*s" fmt, indent, "", ## __VA_ARGS__)
 727 static void qbus_print(Monitor *mon, BusState *bus, int indent);
 728
 729 static void qdev_print_props(Monitor *mon, DeviceState *dev, Property *props,
 730                              int indent)
 731 {
 732     if (!props)
 733         return;
 734     for (; props->name; props++) {
 735         char *value;
 736         char *legacy_name = g_strdup_printf("legacy-%s", props->name);
 737
 738         if (object_property_get_type(OBJECT(dev), legacy_name, NULL)) {
 739             value = object_property_get_str(OBJECT(dev), legacy_name, NULL);
 740         } else {
 741             value = object_property_print(OBJECT(dev), props->name, true,
 742                                           NULL);
 743         }
 744         g_free(legacy_name);
 745
 746         if (!value) {
 747             continue;
 748         }
 749         qdev_printf("%s = %s\n", props->name,
 750                     *value ? value : "<null>");
 751         g_free(value);
 752     }
 753 }
 754
 755 static void bus_print_dev(BusState *bus, Monitor *mon, DeviceState *dev, int indent)
 756 {
 757     BusClass *bc = BUS_GET_CLASS(bus);
 758
 759     if (bc->print_dev) {
 760         bc->print_dev(mon, dev, indent);
 761     }
 762 }
 763
 764 static void qdev_print(Monitor *mon, DeviceState *dev, int indent)
 765 {
 766     ObjectClass *class;
 767     BusState *child;
 768     NamedGPIOList *ngl;
 769     NamedClockList *ncl;
 770
 771     qdev_printf("dev: %s, id \"%s\"\n", object_get_typename(OBJECT(dev)),
 772                 dev->id ? dev->id : "");
 773     indent += 2;
 774     QLIST_FOREACH(ngl, &dev->gpios, node) {
 775         if (ngl->num_in) {
 776             qdev_printf("gpio-in \"%s\" %d\n", ngl->name ? ngl->name : "",
 777                         ngl->num_in);
 778         }
 779         if (ngl->num_out) {
 780             qdev_printf("gpio-out \"%s\" %d\n", ngl->name ? ngl->name : "",
 781                         ngl->num_out);
 782         }
 783     }
 784     QLIST_FOREACH(ncl, &dev->clocks, node) {
 785         g_autofree char *freq_str = clock_display_freq(ncl->clock);
 786         qdev_printf("clock-%s%s \"%s\" freq_hz=%s\n",
 787                     ncl->output ? "out" : "in",
 788                     ncl->alias ? " (alias)" : "",
 789                     ncl->name, freq_str);
 790     }
 791     class = object_get_class(OBJECT(dev));
 792     do {
 793         qdev_print_props(mon, dev, DEVICE_CLASS(class)->props_, indent);
 794         class = object_class_get_parent(class);
 795     } while (class != object_class_by_name(TYPE_DEVICE));
 796     bus_print_dev(dev->parent_bus, mon, dev, indent);
 797     QLIST_FOREACH(child, &dev->child_bus, sibling) {
 798         qbus_print(mon, child, indent);
 799     }
 800 }
 801
 802 static void qbus_print(Monitor *mon, BusState *bus, int indent)
 803 {
 804     BusChild *kid;
 805
 806     qdev_printf("bus: %s\n", bus->name);
 807     indent += 2;
 808     qdev_printf("type %s\n", object_get_typename(OBJECT(bus)));
 809     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 810         DeviceState *dev = kid->child;
 811         qdev_print(mon, dev, indent);
 812     }
 813 }
 814 #undef qdev_printf
 815
 816 void hmp_info_qtree(Monitor *mon, const QDict *qdict)
 817 {
 818     if (sysbus_get_default())
 819         qbus_print(mon, sysbus_get_default(), 0);
 820 }
 821
 822 void hmp_info_qdm(Monitor *mon, const QDict *qdict)
 823 {
 824     qdev_print_devinfos(true);
 825 }
 826
 827 void qmp_device_add(QDict *qdict, QObject **ret_data, Error **errp)
 828 {
 829     QemuOpts *opts;
 830     DeviceState *dev;
 831
 832     opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict, errp);
 833     if (!opts) {
 834         return;
 835     }
 836     if (!monitor_cur_is_qmp() && qdev_device_help(opts)) {
 837         qemu_opts_del(opts);
 838         return;
 839     }
 840     dev = qdev_device_add(opts, errp);
 841
 842     /*
 843      * Drain all pending RCU callbacks. This is done because
 844      * some bus related operations can delay a device removal
 845      * (in this case this can happen if device is added and then
 846      * removed due to a configuration error)
 847      * to a RCU callback, but user might expect that this interface
 848      * will finish its job completely once qmp command returns result
 849      * to the user
 850      */
 851     drain_call_rcu();
 852
 853     if (!dev) {
 854         qemu_opts_del(opts);
 855         return;
 856     }
 857     object_unref(OBJECT(dev));
 858 }
 859
 860 static DeviceState *find_device_state(const char *id, Error **errp)
 861 {
 862     Object *obj;
 863     DeviceState *dev;
 864
 865     if (id[0] == '/') {
 866         obj = object_resolve_path(id, NULL);
 867     } else {
 868         obj = object_resolve_path_component(qdev_get_peripheral(), id);
 869     }
 870
 871     if (!obj) {
 872         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 873                   "Device '%s' not found", id);
 874         return NULL;
 875     }
 876
 877     dev = (DeviceState *)object_dynamic_cast(obj, TYPE_DEVICE);
 878     if (!dev) {
 879         error_setg(errp, "%s is not a hotpluggable device", id);
 880         return NULL;
 881     }
 882
 883     return dev;
 884 }
 885
 886 void qdev_unplug(DeviceState *dev, Error **errp)
 887 {
 888     DeviceClass *dc = DEVICE_GET_CLASS(dev);
 889     HotplugHandler *hotplug_ctrl;
 890     HotplugHandlerClass *hdc;
 891     Error *local_err = NULL;
 892
 893     if (dev->parent_bus && !qbus_is_hotpluggable(dev->parent_bus)) {
 894         error_setg(errp, QERR_BUS_NO_HOTPLUG, dev->parent_bus->name);
 895         return;
 896     }
 897
 898     if (!dc->hotpluggable) {
 899         error_setg(errp, QERR_DEVICE_NO_HOTPLUG,
 900                    object_get_typename(OBJECT(dev)));
 901         return;
 902     }
 903
 904     if (!migration_is_idle() && !dev->allow_unplug_during_migration) {
 905         error_setg(errp, "device_del not allowed while migrating");
 906         return;
 907     }
 908
 909     qdev_hot_removed = true;
 910
 911     hotplug_ctrl = qdev_get_hotplug_handler(dev);
 912     /* hotpluggable device MUST have HotplugHandler, if it doesn't
 913      * then something is very wrong with it */
 914     g_assert(hotplug_ctrl);
 915
 916     /* If device supports async unplug just request it to be done,
 917      * otherwise just remove it synchronously */
 918     hdc = HOTPLUG_HANDLER_GET_CLASS(hotplug_ctrl);
 919     if (hdc->unplug_request) {
 920         hotplug_handler_unplug_request(hotplug_ctrl, dev, &local_err);
 921     } else {
 922         hotplug_handler_unplug(hotplug_ctrl, dev, &local_err);
 923         if (!local_err) {
 924             object_unparent(OBJECT(dev));
 925         }
 926     }
 927     error_propagate(errp, local_err);
 928 }
 929
 930 void qmp_device_del(const char *id, Error **errp)
 931 {
 932     DeviceState *dev = find_device_state(id, errp);
 933     if (dev != NULL) {
 934         if (dev->pending_deleted_event) {
 935             error_setg(errp, "Device %s is already in the "
 936                              "process of unplug", id);
 937             return;
 938         }
 939
 940         qdev_unplug(dev, errp);
 941     }
 942 }
 943
 944 void hmp_device_add(Monitor *mon, const QDict *qdict)
 945 {
 946     Error *err = NULL;
 947
 948     qmp_device_add((QDict *)qdict, NULL, &err);
 949     hmp_handle_error(mon, err);
 950 }
 951
 952 void hmp_device_del(Monitor *mon, const QDict *qdict)
 953 {
 954     const char *id = qdict_get_str(qdict, "id");
 955     Error *err = NULL;
 956
 957     qmp_device_del(id, &err);
 958     hmp_handle_error(mon, err);
 959 }
 960
 961 BlockBackend *blk_by_qdev_id(const char *id, Error **errp)
 962 {
 963     DeviceState *dev;
 964     BlockBackend *blk;
 965
 966     dev = find_device_state(id, errp);
 967     if (dev == NULL) {
 968         return NULL;
 969     }
 970
 971     blk = blk_by_dev(dev);
 972     if (!blk) {
 973         error_setg(errp, "Device does not have a block device backend");
 974     }
 975     return blk;
 976 }
 977
 978 QemuOptsList qemu_device_opts = {
 979     .name = "device",
 980     .implied_opt_name = "driver",
 981     .head = QTAILQ_HEAD_INITIALIZER(qemu_device_opts.head),
 982     .desc = {
 983         /*
 984          * no elements => accept any
 985          * sanity checking will happen later
 986          * when setting device properties
 987          */
 988         { /* end of list */ }
 989     },
 990 };
 991
 992 QemuOptsList qemu_global_opts = {
 993     .name = "global",
 994     .head = QTAILQ_HEAD_INITIALIZER(qemu_global_opts.head),
 995     .desc = {
 996         {
 997             .name = "driver",
 998             .type = QEMU_OPT_STRING,
 999         },{
1000             .name = "property",
1001             .type = QEMU_OPT_STRING,
1002         },{
1003             .name = "value",
1004             .type = QEMU_OPT_STRING,
1005         },
1006         { /* end of list */ }
1007     },
1008 };
1009
1010 int qemu_global_option(const char *str)
1011 {
1012     char driver[64], property[64];
1013     QemuOpts *opts;
1014     int rc, offset;
1015
1016     rc = sscanf(str, "%63[^.=].%63[^=]%n", driver, property, &offset);
1017     if (rc == 2 && str[offset] == '=') {
1018         opts = qemu_opts_create(&qemu_global_opts, NULL, 0, &error_abort);
1019         qemu_opt_set(opts, "driver", driver, &error_abort);
1020         qemu_opt_set(opts, "property", property, &error_abort);
1021         qemu_opt_set(opts, "value", str + offset + 1, &error_abort);
1022         return 0;
1023     }
1024
1025     opts = qemu_opts_parse_noisily(&qemu_global_opts, str, false);
1026     if (!opts) {
1027         return -1;
1028     }
1029
1030     return 0;
1031 }
1032
1033 bool qmp_command_available(const QmpCommand *cmd, Error **errp)
1034 {
1035     if (!phase_check(PHASE_MACHINE_READY) &&
1036         !(cmd->options & QCO_ALLOW_PRECONFIG)) {
1037         error_setg(errp, "The command '%s' is permitted only after machine initialization has completed",
1038                    cmd->name);
1039         return false;
1040     }
1041     return true;
1042 }