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 "qemu/config-file.h"
  32 #include "qemu/error-report.h"
  33 #include "qemu/help_option.h"
  34 #include "qemu/option.h"
  35 #include "qemu/qemu-print.h"
  36 #include "qemu/option_int.h"
  37 #include "sysemu/block-backend.h"
  38 #include "migration/misc.h"
  39 #include "migration/migration.h"
  40 #include "qemu/cutils.h"
  41 #include "hw/qdev-properties.h"
  42 #include "hw/clock.h"
  43
  44 /*
  45  * Aliases were a bad idea from the start.  Let's keep them
  46  * from spreading further.
  47  */
  48 typedef struct QDevAlias
  49 {
  50     const char *typename;
  51     const char *alias;
  52     uint32_t arch_mask;
  53 } QDevAlias;
  54
  55 /* Please keep this table sorted by typename. */
  56 static const QDevAlias qdev_alias_table[] = {
  57     { "AC97", "ac97" }, /* -soundhw name */
  58     { "e1000", "e1000-82540em" },
  59     { "ES1370", "es1370" }, /* -soundhw name */
  60     { "ich9-ahci", "ahci" },
  61     { "lsi53c895a", "lsi" },
  62     { "virtio-9p-device", "virtio-9p", QEMU_ARCH_VIRTIO_MMIO },
  63     { "virtio-9p-ccw", "virtio-9p", QEMU_ARCH_VIRTIO_CCW },
  64     { "virtio-9p-pci", "virtio-9p", QEMU_ARCH_VIRTIO_PCI },
  65     { "virtio-balloon-device", "virtio-balloon", QEMU_ARCH_VIRTIO_MMIO },
  66     { "virtio-balloon-ccw", "virtio-balloon", QEMU_ARCH_VIRTIO_CCW },
  67     { "virtio-balloon-pci", "virtio-balloon", QEMU_ARCH_VIRTIO_PCI },
  68     { "virtio-blk-device", "virtio-blk", QEMU_ARCH_VIRTIO_MMIO },
  69     { "virtio-blk-ccw", "virtio-blk", QEMU_ARCH_VIRTIO_CCW },
  70     { "virtio-blk-pci", "virtio-blk", QEMU_ARCH_VIRTIO_PCI },
  71     { "virtio-gpu-device", "virtio-gpu", QEMU_ARCH_VIRTIO_MMIO },
  72     { "virtio-gpu-ccw", "virtio-gpu", QEMU_ARCH_VIRTIO_CCW },
  73     { "virtio-gpu-pci", "virtio-gpu", QEMU_ARCH_VIRTIO_PCI },
  74     { "virtio-input-host-device", "virtio-input-host", QEMU_ARCH_VIRTIO_MMIO },
  75     { "virtio-input-host-ccw", "virtio-input-host", QEMU_ARCH_VIRTIO_CCW },
  76     { "virtio-input-host-pci", "virtio-input-host", QEMU_ARCH_VIRTIO_PCI },
  77     { "virtio-iommu-pci", "virtio-iommu", QEMU_ARCH_VIRTIO_PCI },
  78     { "virtio-keyboard-device", "virtio-keyboard", QEMU_ARCH_VIRTIO_MMIO },
  79     { "virtio-keyboard-ccw", "virtio-keyboard", QEMU_ARCH_VIRTIO_CCW },
  80     { "virtio-keyboard-pci", "virtio-keyboard", QEMU_ARCH_VIRTIO_PCI },
  81     { "virtio-mouse-device", "virtio-mouse", QEMU_ARCH_VIRTIO_MMIO },
  82     { "virtio-mouse-ccw", "virtio-mouse", QEMU_ARCH_VIRTIO_CCW },
  83     { "virtio-mouse-pci", "virtio-mouse", QEMU_ARCH_VIRTIO_PCI },
  84     { "virtio-net-device", "virtio-net", QEMU_ARCH_VIRTIO_MMIO },
  85     { "virtio-net-ccw", "virtio-net", QEMU_ARCH_VIRTIO_CCW },
  86     { "virtio-net-pci", "virtio-net", QEMU_ARCH_VIRTIO_PCI },
  87     { "virtio-rng-device", "virtio-rng", QEMU_ARCH_VIRTIO_MMIO },
  88     { "virtio-rng-ccw", "virtio-rng", QEMU_ARCH_VIRTIO_CCW },
  89     { "virtio-rng-pci", "virtio-rng", QEMU_ARCH_VIRTIO_PCI },
  90     { "virtio-scsi-device", "virtio-scsi", QEMU_ARCH_VIRTIO_MMIO },
  91     { "virtio-scsi-ccw", "virtio-scsi", QEMU_ARCH_VIRTIO_CCW },
  92     { "virtio-scsi-pci", "virtio-scsi", QEMU_ARCH_VIRTIO_PCI },
  93     { "virtio-serial-device", "virtio-serial", QEMU_ARCH_VIRTIO_MMIO },
  94     { "virtio-serial-ccw", "virtio-serial", QEMU_ARCH_VIRTIO_CCW },
  95     { "virtio-serial-pci", "virtio-serial", QEMU_ARCH_VIRTIO_PCI},
  96     { "virtio-tablet-device", "virtio-tablet", QEMU_ARCH_VIRTIO_MMIO },
  97     { "virtio-tablet-ccw", "virtio-tablet", QEMU_ARCH_VIRTIO_CCW },
  98     { "virtio-tablet-pci", "virtio-tablet", QEMU_ARCH_VIRTIO_PCI },
  99     { }
 100 };
 101
 102 static const char *qdev_class_get_alias(DeviceClass *dc)
 103 {
 104     const char *typename = object_class_get_name(OBJECT_CLASS(dc));
 105     int i;
 106
 107     for (i = 0; qdev_alias_table[i].typename; i++) {
 108         if (qdev_alias_table[i].arch_mask &&
 109             !(qdev_alias_table[i].arch_mask & arch_type)) {
 110             continue;
 111         }
 112
 113         if (strcmp(qdev_alias_table[i].typename, typename) == 0) {
 114             return qdev_alias_table[i].alias;
 115         }
 116     }
 117
 118     return NULL;
 119 }
 120
 121 static bool qdev_class_has_alias(DeviceClass *dc)
 122 {
 123     return (qdev_class_get_alias(dc) != NULL);
 124 }
 125
 126 static void qdev_print_devinfo(DeviceClass *dc)
 127 {
 128     qemu_printf("name \"%s\"", object_class_get_name(OBJECT_CLASS(dc)));
 129     if (dc->bus_type) {
 130         qemu_printf(", bus %s", dc->bus_type);
 131     }
 132     if (qdev_class_has_alias(dc)) {
 133         qemu_printf(", alias \"%s\"", qdev_class_get_alias(dc));
 134     }
 135     if (dc->desc) {
 136         qemu_printf(", desc \"%s\"", dc->desc);
 137     }
 138     if (!dc->user_creatable) {
 139         qemu_printf(", no-user");
 140     }
 141     qemu_printf("\n");
 142 }
 143
 144 static void qdev_print_devinfos(bool show_no_user)
 145 {
 146     static const char *cat_name[DEVICE_CATEGORY_MAX + 1] = {
 147         [DEVICE_CATEGORY_BRIDGE]  = "Controller/Bridge/Hub",
 148         [DEVICE_CATEGORY_USB]     = "USB",
 149         [DEVICE_CATEGORY_STORAGE] = "Storage",
 150         [DEVICE_CATEGORY_NETWORK] = "Network",
 151         [DEVICE_CATEGORY_INPUT]   = "Input",
 152         [DEVICE_CATEGORY_DISPLAY] = "Display",
 153         [DEVICE_CATEGORY_SOUND]   = "Sound",
 154         [DEVICE_CATEGORY_MISC]    = "Misc",
 155         [DEVICE_CATEGORY_CPU]     = "CPU",
 156         [DEVICE_CATEGORY_MAX]     = "Uncategorized",
 157     };
 158     GSList *list, *elt;
 159     int i;
 160     bool cat_printed;
 161
 162     module_load_qom_all();
 163     list = object_class_get_list_sorted(TYPE_DEVICE, false);
 164
 165     for (i = 0; i <= DEVICE_CATEGORY_MAX; i++) {
 166         cat_printed = false;
 167         for (elt = list; elt; elt = elt->next) {
 168             DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, elt->data,
 169                                                  TYPE_DEVICE);
 170             if ((i < DEVICE_CATEGORY_MAX
 171                  ? !test_bit(i, dc->categories)
 172                  : !bitmap_empty(dc->categories, DEVICE_CATEGORY_MAX))
 173                 || (!show_no_user
 174                     && !dc->user_creatable)) {
 175                 continue;
 176             }
 177             if (!cat_printed) {
 178                 qemu_printf("%s%s devices:\n", i ? "\n" : "", cat_name[i]);
 179                 cat_printed = true;
 180             }
 181             qdev_print_devinfo(dc);
 182         }
 183     }
 184
 185     g_slist_free(list);
 186 }
 187
 188 static int set_property(void *opaque, const char *name, const char *value,
 189                         Error **errp)
 190 {
 191     Object *obj = opaque;
 192
 193     if (strcmp(name, "driver") == 0)
 194         return 0;
 195     if (strcmp(name, "bus") == 0)
 196         return 0;
 197
 198     if (!object_property_parse(obj, name, value, errp)) {
 199         return -1;
 200     }
 201     return 0;
 202 }
 203
 204 static const char *find_typename_by_alias(const char *alias)
 205 {
 206     int i;
 207
 208     for (i = 0; qdev_alias_table[i].alias; i++) {
 209         if (qdev_alias_table[i].arch_mask &&
 210             !(qdev_alias_table[i].arch_mask & arch_type)) {
 211             continue;
 212         }
 213
 214         if (strcmp(qdev_alias_table[i].alias, alias) == 0) {
 215             return qdev_alias_table[i].typename;
 216         }
 217     }
 218
 219     return NULL;
 220 }
 221
 222 static DeviceClass *qdev_get_device_class(const char **driver, Error **errp)
 223 {
 224     ObjectClass *oc;
 225     DeviceClass *dc;
 226     const char *original_name = *driver;
 227
 228     oc = module_object_class_by_name(*driver);
 229     if (!oc) {
 230         const char *typename = find_typename_by_alias(*driver);
 231
 232         if (typename) {
 233             *driver = typename;
 234             oc = module_object_class_by_name(*driver);
 235         }
 236     }
 237
 238     if (!object_class_dynamic_cast(oc, TYPE_DEVICE)) {
 239         if (*driver != original_name) {
 240             error_setg(errp, "'%s' (alias '%s') is not a valid device model"
 241                        " name", original_name, *driver);
 242         } else {
 243             error_setg(errp, "'%s' is not a valid device model name", *driver);
 244         }
 245         return NULL;
 246     }
 247
 248     if (object_class_is_abstract(oc)) {
 249         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
 250                    "a non-abstract device type");
 251         return NULL;
 252     }
 253
 254     dc = DEVICE_CLASS(oc);
 255     if (!dc->user_creatable ||
 256         (phase_check(PHASE_MACHINE_READY) && !dc->hotpluggable)) {
 257         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
 258                    "a pluggable device type");
 259         return NULL;
 260     }
 261
 262     return dc;
 263 }
 264
 265
 266 int qdev_device_help(QemuOpts *opts)
 267 {
 268     Error *local_err = NULL;
 269     const char *driver;
 270     ObjectPropertyInfoList *prop_list;
 271     ObjectPropertyInfoList *prop;
 272     GPtrArray *array;
 273     int i;
 274
 275     driver = qemu_opt_get(opts, "driver");
 276     if (driver && is_help_option(driver)) {
 277         qdev_print_devinfos(false);
 278         return 1;
 279     }
 280
 281     if (!driver || !qemu_opt_has_help_opt(opts)) {
 282         return 0;
 283     }
 284
 285     if (!object_class_by_name(driver)) {
 286         const char *typename = find_typename_by_alias(driver);
 287
 288         if (typename) {
 289             driver = typename;
 290         }
 291     }
 292
 293     prop_list = qmp_device_list_properties(driver, &local_err);
 294     if (local_err) {
 295         goto error;
 296     }
 297
 298     if (prop_list) {
 299         qemu_printf("%s options:\n", driver);
 300     } else {
 301         qemu_printf("There are no options for %s.\n", driver);
 302     }
 303     array = g_ptr_array_new();
 304     for (prop = prop_list; prop; prop = prop->next) {
 305         g_ptr_array_add(array,
 306                         object_property_help(prop->value->name,
 307                                              prop->value->type,
 308                                              prop->value->default_value,
 309                                              prop->value->description));
 310     }
 311     g_ptr_array_sort(array, (GCompareFunc)qemu_pstrcmp0);
 312     for (i = 0; i < array->len; i++) {
 313         qemu_printf("%s\n", (char *)array->pdata[i]);
 314     }
 315     g_ptr_array_set_free_func(array, g_free);
 316     g_ptr_array_free(array, true);
 317     qapi_free_ObjectPropertyInfoList(prop_list);
 318     return 1;
 319
 320 error:
 321     error_report_err(local_err);
 322     return 1;
 323 }
 324
 325 static Object *qdev_get_peripheral(void)
 326 {
 327     static Object *dev;
 328
 329     if (dev == NULL) {
 330         dev = container_get(qdev_get_machine(), "/peripheral");
 331     }
 332
 333     return dev;
 334 }
 335
 336 static Object *qdev_get_peripheral_anon(void)
 337 {
 338     static Object *dev;
 339
 340     if (dev == NULL) {
 341         dev = container_get(qdev_get_machine(), "/peripheral-anon");
 342     }
 343
 344     return dev;
 345 }
 346
 347 static void qbus_error_append_bus_list_hint(DeviceState *dev,
 348                                             Error *const *errp)
 349 {
 350     BusState *child;
 351     const char *sep = " ";
 352
 353     error_append_hint(errp, "child buses at \"%s\":",
 354                       dev->id ? dev->id : object_get_typename(OBJECT(dev)));
 355     QLIST_FOREACH(child, &dev->child_bus, sibling) {
 356         error_append_hint(errp, "%s\"%s\"", sep, child->name);
 357         sep = ", ";
 358     }
 359     error_append_hint(errp, "\n");
 360 }
 361
 362 static void qbus_error_append_dev_list_hint(BusState *bus,
 363                                             Error *const *errp)
 364 {
 365     BusChild *kid;
 366     const char *sep = " ";
 367
 368     error_append_hint(errp, "devices at \"%s\":", bus->name);
 369     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 370         DeviceState *dev = kid->child;
 371         error_append_hint(errp, "%s\"%s\"", sep,
 372                           object_get_typename(OBJECT(dev)));
 373         if (dev->id) {
 374             error_append_hint(errp, "/\"%s\"", dev->id);
 375         }
 376         sep = ", ";
 377     }
 378     error_append_hint(errp, "\n");
 379 }
 380
 381 static BusState *qbus_find_bus(DeviceState *dev, char *elem)
 382 {
 383     BusState *child;
 384
 385     QLIST_FOREACH(child, &dev->child_bus, sibling) {
 386         if (strcmp(child->name, elem) == 0) {
 387             return child;
 388         }
 389     }
 390     return NULL;
 391 }
 392
 393 static DeviceState *qbus_find_dev(BusState *bus, char *elem)
 394 {
 395     BusChild *kid;
 396
 397     /*
 398      * try to match in order:
 399      *   (1) instance id, if present
 400      *   (2) driver name
 401      *   (3) driver alias, if present
 402      */
 403     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 404         DeviceState *dev = kid->child;
 405         if (dev->id  &&  strcmp(dev->id, elem) == 0) {
 406             return dev;
 407         }
 408     }
 409     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 410         DeviceState *dev = kid->child;
 411         if (strcmp(object_get_typename(OBJECT(dev)), elem) == 0) {
 412             return dev;
 413         }
 414     }
 415     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 416         DeviceState *dev = kid->child;
 417         DeviceClass *dc = DEVICE_GET_CLASS(dev);
 418
 419         if (qdev_class_has_alias(dc) &&
 420             strcmp(qdev_class_get_alias(dc), elem) == 0) {
 421             return dev;
 422         }
 423     }
 424     return NULL;
 425 }
 426
 427 static inline bool qbus_is_full(BusState *bus)
 428 {
 429     BusClass *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 void qdev_set_id(DeviceState *dev, const char *id)
 568 {
 569     if (id) {
 570         dev->id = id;
 571     }
 572
 573     if (dev->id) {
 574         object_property_add_child(qdev_get_peripheral(), dev->id,
 575                                   OBJECT(dev));
 576     } else {
 577         static int anon_count;
 578         gchar *name = g_strdup_printf("device[%d]", anon_count++);
 579         object_property_add_child(qdev_get_peripheral_anon(), name,
 580                                   OBJECT(dev));
 581         g_free(name);
 582     }
 583 }
 584
 585 DeviceState *qdev_device_add(QemuOpts *opts, Error **errp)
 586 {
 587     DeviceClass *dc;
 588     const char *driver, *path;
 589     DeviceState *dev = NULL;
 590     BusState *bus = NULL;
 591
 592     driver = qemu_opt_get(opts, "driver");
 593     if (!driver) {
 594         error_setg(errp, QERR_MISSING_PARAMETER, "driver");
 595         return NULL;
 596     }
 597
 598     /* find driver */
 599     dc = qdev_get_device_class(&driver, errp);
 600     if (!dc) {
 601         return NULL;
 602     }
 603
 604     /* find bus */
 605     path = qemu_opt_get(opts, "bus");
 606     if (path != NULL) {
 607         bus = qbus_find(path, errp);
 608         if (!bus) {
 609             return NULL;
 610         }
 611         if (!object_dynamic_cast(OBJECT(bus), dc->bus_type)) {
 612             error_setg(errp, "Device '%s' can't go on %s bus",
 613                        driver, object_get_typename(OBJECT(bus)));
 614             return NULL;
 615         }
 616     } else if (dc->bus_type != NULL) {
 617         bus = qbus_find_recursive(sysbus_get_default(), NULL, dc->bus_type);
 618         if (!bus || qbus_is_full(bus)) {
 619             error_setg(errp, "No '%s' bus found for device '%s'",
 620                        dc->bus_type, driver);
 621             return NULL;
 622         }
 623     }
 624
 625     if (qemu_opt_get(opts, "failover_pair_id")) {
 626         if (!opts->id) {
 627             error_setg(errp, "Device with failover_pair_id don't have id");
 628             return NULL;
 629         }
 630         if (qdev_should_hide_device(opts)) {
 631             if (bus && !qbus_is_hotpluggable(bus)) {
 632                 error_setg(errp, QERR_BUS_NO_HOTPLUG, bus->name);
 633             }
 634             return NULL;
 635         }
 636     }
 637
 638     if (phase_check(PHASE_MACHINE_READY) && bus && !qbus_is_hotpluggable(bus)) {
 639         error_setg(errp, QERR_BUS_NO_HOTPLUG, bus->name);
 640         return NULL;
 641     }
 642
 643     if (!migration_is_idle()) {
 644         error_setg(errp, "device_add not allowed while migrating");
 645         return NULL;
 646     }
 647
 648     /* create device */
 649     dev = qdev_new(driver);
 650
 651     /* Check whether the hotplug is allowed by the machine */
 652     if (phase_check(PHASE_MACHINE_READY)) {
 653         if (!qdev_hotplug_allowed(dev, errp)) {
 654             goto err_del_dev;
 655         }
 656
 657         if (!bus && !qdev_get_machine_hotplug_handler(dev)) {
 658             /* No bus, no machine hotplug handler --> device is not hotpluggable */
 659             error_setg(errp, "Device '%s' can not be hotplugged on this machine",
 660                        driver);
 661             goto err_del_dev;
 662         }
 663     }
 664
 665     qdev_set_id(dev, qemu_opts_id(opts));
 666
 667     /* set properties */
 668     if (qemu_opt_foreach(opts, set_property, dev, errp)) {
 669         goto err_del_dev;
 670     }
 671
 672     dev->opts = opts;
 673     if (!qdev_realize(DEVICE(dev), bus, errp)) {
 674         dev->opts = NULL;
 675         goto err_del_dev;
 676     }
 677     return dev;
 678
 679 err_del_dev:
 680     if (dev) {
 681         object_unparent(OBJECT(dev));
 682         object_unref(OBJECT(dev));
 683     }
 684     return NULL;
 685 }
 686
 687
 688 #define qdev_printf(fmt, ...) monitor_printf(mon, "%*s" fmt, indent, "", ## __VA_ARGS__)
 689 static void qbus_print(Monitor *mon, BusState *bus, int indent);
 690
 691 static void qdev_print_props(Monitor *mon, DeviceState *dev, Property *props,
 692                              int indent)
 693 {
 694     if (!props)
 695         return;
 696     for (; props->name; props++) {
 697         char *value;
 698         char *legacy_name = g_strdup_printf("legacy-%s", props->name);
 699
 700         if (object_property_get_type(OBJECT(dev), legacy_name, NULL)) {
 701             value = object_property_get_str(OBJECT(dev), legacy_name, NULL);
 702         } else {
 703             value = object_property_print(OBJECT(dev), props->name, true,
 704                                           NULL);
 705         }
 706         g_free(legacy_name);
 707
 708         if (!value) {
 709             continue;
 710         }
 711         qdev_printf("%s = %s\n", props->name,
 712                     *value ? value : "<null>");
 713         g_free(value);
 714     }
 715 }
 716
 717 static void bus_print_dev(BusState *bus, Monitor *mon, DeviceState *dev, int indent)
 718 {
 719     BusClass *bc = BUS_GET_CLASS(bus);
 720
 721     if (bc->print_dev) {
 722         bc->print_dev(mon, dev, indent);
 723     }
 724 }
 725
 726 static void qdev_print(Monitor *mon, DeviceState *dev, int indent)
 727 {
 728     ObjectClass *class;
 729     BusState *child;
 730     NamedGPIOList *ngl;
 731     NamedClockList *ncl;
 732
 733     qdev_printf("dev: %s, id \"%s\"\n", object_get_typename(OBJECT(dev)),
 734                 dev->id ? dev->id : "");
 735     indent += 2;
 736     QLIST_FOREACH(ngl, &dev->gpios, node) {
 737         if (ngl->num_in) {
 738             qdev_printf("gpio-in \"%s\" %d\n", ngl->name ? ngl->name : "",
 739                         ngl->num_in);
 740         }
 741         if (ngl->num_out) {
 742             qdev_printf("gpio-out \"%s\" %d\n", ngl->name ? ngl->name : "",
 743                         ngl->num_out);
 744         }
 745     }
 746     QLIST_FOREACH(ncl, &dev->clocks, node) {
 747         g_autofree char *freq_str = clock_display_freq(ncl->clock);
 748         qdev_printf("clock-%s%s \"%s\" freq_hz=%s\n",
 749                     ncl->output ? "out" : "in",
 750                     ncl->alias ? " (alias)" : "",
 751                     ncl->name, freq_str);
 752     }
 753     class = object_get_class(OBJECT(dev));
 754     do {
 755         qdev_print_props(mon, dev, DEVICE_CLASS(class)->props_, indent);
 756         class = object_class_get_parent(class);
 757     } while (class != object_class_by_name(TYPE_DEVICE));
 758     bus_print_dev(dev->parent_bus, mon, dev, indent);
 759     QLIST_FOREACH(child, &dev->child_bus, sibling) {
 760         qbus_print(mon, child, indent);
 761     }
 762 }
 763
 764 static void qbus_print(Monitor *mon, BusState *bus, int indent)
 765 {
 766     BusChild *kid;
 767
 768     qdev_printf("bus: %s\n", bus->name);
 769     indent += 2;
 770     qdev_printf("type %s\n", object_get_typename(OBJECT(bus)));
 771     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 772         DeviceState *dev = kid->child;
 773         qdev_print(mon, dev, indent);
 774     }
 775 }
 776 #undef qdev_printf
 777
 778 void hmp_info_qtree(Monitor *mon, const QDict *qdict)
 779 {
 780     if (sysbus_get_default())
 781         qbus_print(mon, sysbus_get_default(), 0);
 782 }
 783
 784 void hmp_info_qdm(Monitor *mon, const QDict *qdict)
 785 {
 786     qdev_print_devinfos(true);
 787 }
 788
 789 void qmp_device_add(QDict *qdict, QObject **ret_data, Error **errp)
 790 {
 791     QemuOpts *opts;
 792     DeviceState *dev;
 793
 794     opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict, errp);
 795     if (!opts) {
 796         return;
 797     }
 798     if (!monitor_cur_is_qmp() && qdev_device_help(opts)) {
 799         qemu_opts_del(opts);
 800         return;
 801     }
 802     dev = qdev_device_add(opts, errp);
 803
 804     /*
 805      * Drain all pending RCU callbacks. This is done because
 806      * some bus related operations can delay a device removal
 807      * (in this case this can happen if device is added and then
 808      * removed due to a configuration error)
 809      * to a RCU callback, but user might expect that this interface
 810      * will finish its job completely once qmp command returns result
 811      * to the user
 812      */
 813     drain_call_rcu();
 814
 815     if (!dev) {
 816         qemu_opts_del(opts);
 817         return;
 818     }
 819     object_unref(OBJECT(dev));
 820 }
 821
 822 static DeviceState *find_device_state(const char *id, Error **errp)
 823 {
 824     Object *obj;
 825
 826     if (id[0] == '/') {
 827         obj = object_resolve_path(id, NULL);
 828     } else {
 829         char *root_path = object_get_canonical_path(qdev_get_peripheral());
 830         char *path = g_strdup_printf("%s/%s", root_path, id);
 831
 832         g_free(root_path);
 833         obj = object_resolve_path_type(path, TYPE_DEVICE, NULL);
 834         g_free(path);
 835     }
 836
 837     if (!obj) {
 838         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 839                   "Device '%s' not found", id);
 840         return NULL;
 841     }
 842
 843     if (!object_dynamic_cast(obj, TYPE_DEVICE)) {
 844         error_setg(errp, "%s is not a hotpluggable device", id);
 845         return NULL;
 846     }
 847
 848     return DEVICE(obj);
 849 }
 850
 851 void qdev_unplug(DeviceState *dev, Error **errp)
 852 {
 853     DeviceClass *dc = DEVICE_GET_CLASS(dev);
 854     HotplugHandler *hotplug_ctrl;
 855     HotplugHandlerClass *hdc;
 856     Error *local_err = NULL;
 857
 858     if (dev->parent_bus && !qbus_is_hotpluggable(dev->parent_bus)) {
 859         error_setg(errp, QERR_BUS_NO_HOTPLUG, dev->parent_bus->name);
 860         return;
 861     }
 862
 863     if (!dc->hotpluggable) {
 864         error_setg(errp, QERR_DEVICE_NO_HOTPLUG,
 865                    object_get_typename(OBJECT(dev)));
 866         return;
 867     }
 868
 869     if (!migration_is_idle() && !dev->allow_unplug_during_migration) {
 870         error_setg(errp, "device_del not allowed while migrating");
 871         return;
 872     }
 873
 874     qdev_hot_removed = true;
 875
 876     hotplug_ctrl = qdev_get_hotplug_handler(dev);
 877     /* hotpluggable device MUST have HotplugHandler, if it doesn't
 878      * then something is very wrong with it */
 879     g_assert(hotplug_ctrl);
 880
 881     /* If device supports async unplug just request it to be done,
 882      * otherwise just remove it synchronously */
 883     hdc = HOTPLUG_HANDLER_GET_CLASS(hotplug_ctrl);
 884     if (hdc->unplug_request) {
 885         hotplug_handler_unplug_request(hotplug_ctrl, dev, &local_err);
 886     } else {
 887         hotplug_handler_unplug(hotplug_ctrl, dev, &local_err);
 888         if (!local_err) {
 889             object_unparent(OBJECT(dev));
 890         }
 891     }
 892     error_propagate(errp, local_err);
 893 }
 894
 895 void qmp_device_del(const char *id, Error **errp)
 896 {
 897     DeviceState *dev = find_device_state(id, errp);
 898     if (dev != NULL) {
 899         if (dev->pending_deleted_event) {
 900             error_setg(errp, "Device %s is already in the "
 901                              "process of unplug", id);
 902             return;
 903         }
 904
 905         qdev_unplug(dev, errp);
 906     }
 907 }
 908
 909 void hmp_device_add(Monitor *mon, const QDict *qdict)
 910 {
 911     Error *err = NULL;
 912
 913     qmp_device_add((QDict *)qdict, NULL, &err);
 914     hmp_handle_error(mon, err);
 915 }
 916
 917 void hmp_device_del(Monitor *mon, const QDict *qdict)
 918 {
 919     const char *id = qdict_get_str(qdict, "id");
 920     Error *err = NULL;
 921
 922     qmp_device_del(id, &err);
 923     hmp_handle_error(mon, err);
 924 }
 925
 926 BlockBackend *blk_by_qdev_id(const char *id, Error **errp)
 927 {
 928     DeviceState *dev;
 929     BlockBackend *blk;
 930
 931     dev = find_device_state(id, errp);
 932     if (dev == NULL) {
 933         return NULL;
 934     }
 935
 936     blk = blk_by_dev(dev);
 937     if (!blk) {
 938         error_setg(errp, "Device does not have a block device backend");
 939     }
 940     return blk;
 941 }
 942
 943 QemuOptsList qemu_device_opts = {
 944     .name = "device",
 945     .implied_opt_name = "driver",
 946     .head = QTAILQ_HEAD_INITIALIZER(qemu_device_opts.head),
 947     .desc = {
 948         /*
 949          * no elements => accept any
 950          * sanity checking will happen later
 951          * when setting device properties
 952          */
 953         { /* end of list */ }
 954     },
 955 };
 956
 957 QemuOptsList qemu_global_opts = {
 958     .name = "global",
 959     .head = QTAILQ_HEAD_INITIALIZER(qemu_global_opts.head),
 960     .desc = {
 961         {
 962             .name = "driver",
 963             .type = QEMU_OPT_STRING,
 964         },{
 965             .name = "property",
 966             .type = QEMU_OPT_STRING,
 967         },{
 968             .name = "value",
 969             .type = QEMU_OPT_STRING,
 970         },
 971         { /* end of list */ }
 972     },
 973 };
 974
 975 int qemu_global_option(const char *str)
 976 {
 977     char driver[64], property[64];
 978     QemuOpts *opts;
 979     int rc, offset;
 980
 981     rc = sscanf(str, "%63[^.=].%63[^=]%n", driver, property, &offset);
 982     if (rc == 2 && str[offset] == '=') {
 983         opts = qemu_opts_create(&qemu_global_opts, NULL, 0, &error_abort);
 984         qemu_opt_set(opts, "driver", driver, &error_abort);
 985         qemu_opt_set(opts, "property", property, &error_abort);
 986         qemu_opt_set(opts, "value", str + offset + 1, &error_abort);
 987         return 0;
 988     }
 989
 990     opts = qemu_opts_parse_noisily(&qemu_global_opts, str, false);
 991     if (!opts) {
 992         return -1;
 993     }
 994
 995     return 0;
 996 }
 997
 998 bool qmp_command_available(const QmpCommand *cmd, Error **errp)
 999 {
1000     if (!phase_check(PHASE_MACHINE_READY) &&
1001         !(cmd->options & QCO_ALLOW_PRECONFIG)) {
1002         error_setg(errp, "The command '%s' is permitted only after machine initialization has completed",
1003                    cmd->name);
1004         return false;
1005     }
1006     return true;
1007 }