qmp.c

   1 /*
   2  * QEMU Management Protocol
   3  *
   4  * Copyright IBM, Corp. 2011
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  * Contributions after 2012-01-13 are licensed under the terms of the
  13  * GNU GPL, version 2 or (at your option) any later version.
  14  */
  15
  16 #include "qemu-common.h"
  17 #include "monitor/monitor.h"
  18 #include "sysemu/sysemu.h"
  19 #include "qmp-commands.h"
  20 #include "sysemu/char.h"
  21 #include "ui/qemu-spice.h"
  22 #include "ui/vnc.h"
  23 #include "sysemu/kvm.h"
  24 #include "sysemu/arch_init.h"
  25 #include "hw/qdev.h"
  26 #include "sysemu/blockdev.h"
  27 #include "sysemu/block-backend.h"
  28 #include "qom/qom-qobject.h"
  29 #include "qapi/qmp/qerror.h"
  30 #include "qapi/qmp/qobject.h"
  31 #include "qapi/qmp-input-visitor.h"
  32 #include "hw/boards.h"
  33 #include "qom/object_interfaces.h"
  34 #include "hw/mem/pc-dimm.h"
  35 #include "hw/acpi/acpi_dev_interface.h"
  36
  37 NameInfo *qmp_query_name(Error **errp)
  38 {
  39     NameInfo *info = g_malloc0(sizeof(*info));
  40
  41     if (qemu_name) {
  42         info->has_name = true;
  43         info->name = g_strdup(qemu_name);
  44     }
  45
  46     return info;
  47 }
  48
  49 VersionInfo *qmp_query_version(Error **errp)
  50 {
  51     VersionInfo *info = g_new0(VersionInfo, 1);
  52     const char *version = QEMU_VERSION;
  53     const char *tmp;
  54     int err;
  55
  56     info->qemu = g_new0(VersionTriple, 1);
  57     err = qemu_strtoll(version, &tmp, 10, &info->qemu->major);
  58     assert(err == 0);
  59     tmp++;
  60
  61     err = qemu_strtoll(tmp, &tmp, 10, &info->qemu->minor);
  62     assert(err == 0);
  63     tmp++;
  64
  65     err = qemu_strtoll(tmp, &tmp, 10, &info->qemu->micro);
  66     assert(err == 0);
  67     info->package = g_strdup(QEMU_PKGVERSION);
  68
  69     return info;
  70 }
  71
  72 KvmInfo *qmp_query_kvm(Error **errp)
  73 {
  74     KvmInfo *info = g_malloc0(sizeof(*info));
  75
  76     info->enabled = kvm_enabled();
  77     info->present = kvm_available();
  78
  79     return info;
  80 }
  81
  82 UuidInfo *qmp_query_uuid(Error **errp)
  83 {
  84     UuidInfo *info = g_malloc0(sizeof(*info));
  85     char uuid[64];
  86
  87     snprintf(uuid, sizeof(uuid), UUID_FMT, qemu_uuid[0], qemu_uuid[1],
  88                    qemu_uuid[2], qemu_uuid[3], qemu_uuid[4], qemu_uuid[5],
  89                    qemu_uuid[6], qemu_uuid[7], qemu_uuid[8], qemu_uuid[9],
  90                    qemu_uuid[10], qemu_uuid[11], qemu_uuid[12], qemu_uuid[13],
  91                    qemu_uuid[14], qemu_uuid[15]);
  92
  93     info->UUID = g_strdup(uuid);
  94     return info;
  95 }
  96
  97 void qmp_quit(Error **errp)
  98 {
  99     no_shutdown = 0;
 100     qemu_system_shutdown_request();
 101 }
 102
 103 void qmp_stop(Error **errp)
 104 {
 105     if (runstate_check(RUN_STATE_INMIGRATE)) {
 106         autostart = 0;
 107     } else {
 108         vm_stop(RUN_STATE_PAUSED);
 109     }
 110 }
 111
 112 void qmp_system_reset(Error **errp)
 113 {
 114     qemu_system_reset_request();
 115 }
 116
 117 void qmp_system_powerdown(Error **erp)
 118 {
 119     qemu_system_powerdown_request();
 120 }
 121
 122 void qmp_cpu(int64_t index, Error **errp)
 123 {
 124     /* Just do nothing */
 125 }
 126
 127 void qmp_cpu_add(int64_t id, Error **errp)
 128 {
 129     MachineClass *mc;
 130
 131     mc = MACHINE_GET_CLASS(current_machine);
 132     if (mc->hot_add_cpu) {
 133         mc->hot_add_cpu(id, errp);
 134     } else {
 135         error_setg(errp, "Not supported");
 136     }
 137 }
 138
 139 #ifndef CONFIG_VNC
 140 /* If VNC support is enabled, the "true" query-vnc command is
 141    defined in the VNC subsystem */
 142 VncInfo *qmp_query_vnc(Error **errp)
 143 {
 144     error_setg(errp, QERR_FEATURE_DISABLED, "vnc");
 145     return NULL;
 146 };
 147
 148 VncInfo2List *qmp_query_vnc_servers(Error **errp)
 149 {
 150     error_setg(errp, QERR_FEATURE_DISABLED, "vnc");
 151     return NULL;
 152 };
 153 #endif
 154
 155 #ifndef CONFIG_SPICE
 156 /*
 157  * qmp-commands.hx ensures that QMP command query-spice exists only
 158  * #ifdef CONFIG_SPICE.  Necessary for an accurate query-commands
 159  * result.  However, the QAPI schema is blissfully unaware of that,
 160  * and the QAPI code generator happily generates a dead
 161  * qmp_marshal_query_spice() that calls qmp_query_spice().  Provide it
 162  * one, or else linking fails.  FIXME Educate the QAPI schema on
 163  * CONFIG_SPICE.
 164  */
 165 SpiceInfo *qmp_query_spice(Error **errp)
 166 {
 167     abort();
 168 };
 169 #endif
 170
 171 void qmp_cont(Error **errp)
 172 {
 173     Error *local_err = NULL;
 174     BlockBackend *blk;
 175     BlockDriverState *bs;
 176
 177     if (runstate_needs_reset()) {
 178         error_setg(errp, "Resetting the Virtual Machine is required");
 179         return;
 180     } else if (runstate_check(RUN_STATE_SUSPENDED)) {
 181         return;
 182     }
 183
 184     for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
 185         blk_iostatus_reset(blk);
 186     }
 187     for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
 188         bdrv_add_key(bs, NULL, &local_err);
 189         if (local_err) {
 190             error_propagate(errp, local_err);
 191             return;
 192         }
 193     }
 194
 195     if (runstate_check(RUN_STATE_INMIGRATE)) {
 196         autostart = 1;
 197     } else {
 198         vm_start();
 199     }
 200 }
 201
 202 void qmp_system_wakeup(Error **errp)
 203 {
 204     qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
 205 }
 206
 207 ObjectPropertyInfoList *qmp_qom_list(const char *path, Error **errp)
 208 {
 209     Object *obj;
 210     bool ambiguous = false;
 211     ObjectPropertyInfoList *props = NULL;
 212     ObjectProperty *prop;
 213
 214     obj = object_resolve_path(path, &ambiguous);
 215     if (obj == NULL) {
 216         if (ambiguous) {
 217             error_setg(errp, "Path '%s' is ambiguous", path);
 218         } else {
 219             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 220                       "Device '%s' not found", path);
 221         }
 222         return NULL;
 223     }
 224
 225     QTAILQ_FOREACH(prop, &obj->properties, node) {
 226         ObjectPropertyInfoList *entry = g_malloc0(sizeof(*entry));
 227
 228         entry->value = g_malloc0(sizeof(ObjectPropertyInfo));
 229         entry->next = props;
 230         props = entry;
 231
 232         entry->value->name = g_strdup(prop->name);
 233         entry->value->type = g_strdup(prop->type);
 234     }
 235
 236     return props;
 237 }
 238
 239 void qmp_qom_set(const char *path, const char *property, QObject *value,
 240                  Error **errp)
 241 {
 242     Object *obj;
 243
 244     obj = object_resolve_path(path, NULL);
 245     if (!obj) {
 246         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 247                   "Device '%s' not found", path);
 248         return;
 249     }
 250
 251     object_property_set_qobject(obj, value, property, errp);
 252 }
 253
 254 QObject *qmp_qom_get(const char *path, const char *property, Error **errp)
 255 {
 256     Object *obj;
 257
 258     obj = object_resolve_path(path, NULL);
 259     if (!obj) {
 260         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 261                   "Device '%s' not found", path);
 262         return NULL;
 263     }
 264
 265     return object_property_get_qobject(obj, property, errp);
 266 }
 267
 268 void qmp_set_password(const char *protocol, const char *password,
 269                       bool has_connected, const char *connected, Error **errp)
 270 {
 271     int disconnect_if_connected = 0;
 272     int fail_if_connected = 0;
 273     int rc;
 274
 275     if (has_connected) {
 276         if (strcmp(connected, "fail") == 0) {
 277             fail_if_connected = 1;
 278         } else if (strcmp(connected, "disconnect") == 0) {
 279             disconnect_if_connected = 1;
 280         } else if (strcmp(connected, "keep") == 0) {
 281             /* nothing */
 282         } else {
 283             error_setg(errp, QERR_INVALID_PARAMETER, "connected");
 284             return;
 285         }
 286     }
 287
 288     if (strcmp(protocol, "spice") == 0) {
 289         if (!qemu_using_spice(errp)) {
 290             return;
 291         }
 292         rc = qemu_spice_set_passwd(password, fail_if_connected,
 293                                    disconnect_if_connected);
 294         if (rc != 0) {
 295             error_setg(errp, QERR_SET_PASSWD_FAILED);
 296         }
 297         return;
 298     }
 299
 300     if (strcmp(protocol, "vnc") == 0) {
 301         if (fail_if_connected || disconnect_if_connected) {
 302             /* vnc supports "connected=keep" only */
 303             error_setg(errp, QERR_INVALID_PARAMETER, "connected");
 304             return;
 305         }
 306         /* Note that setting an empty password will not disable login through
 307          * this interface. */
 308         rc = vnc_display_password(NULL, password);
 309         if (rc < 0) {
 310             error_setg(errp, QERR_SET_PASSWD_FAILED);
 311         }
 312         return;
 313     }
 314
 315     error_setg(errp, QERR_INVALID_PARAMETER, "protocol");
 316 }
 317
 318 void qmp_expire_password(const char *protocol, const char *whenstr,
 319                          Error **errp)
 320 {
 321     time_t when;
 322     int rc;
 323
 324     if (strcmp(whenstr, "now") == 0) {
 325         when = 0;
 326     } else if (strcmp(whenstr, "never") == 0) {
 327         when = TIME_MAX;
 328     } else if (whenstr[0] == '+') {
 329         when = time(NULL) + strtoull(whenstr+1, NULL, 10);
 330     } else {
 331         when = strtoull(whenstr, NULL, 10);
 332     }
 333
 334     if (strcmp(protocol, "spice") == 0) {
 335         if (!qemu_using_spice(errp)) {
 336             return;
 337         }
 338         rc = qemu_spice_set_pw_expire(when);
 339         if (rc != 0) {
 340             error_setg(errp, QERR_SET_PASSWD_FAILED);
 341         }
 342         return;
 343     }
 344
 345     if (strcmp(protocol, "vnc") == 0) {
 346         rc = vnc_display_pw_expire(NULL, when);
 347         if (rc != 0) {
 348             error_setg(errp, QERR_SET_PASSWD_FAILED);
 349         }
 350         return;
 351     }
 352
 353     error_setg(errp, QERR_INVALID_PARAMETER, "protocol");
 354 }
 355
 356 #ifdef CONFIG_VNC
 357 void qmp_change_vnc_password(const char *password, Error **errp)
 358 {
 359     if (vnc_display_password(NULL, password) < 0) {
 360         error_setg(errp, QERR_SET_PASSWD_FAILED);
 361     }
 362 }
 363
 364 static void qmp_change_vnc_listen(const char *target, Error **errp)
 365 {
 366     QemuOptsList *olist = qemu_find_opts("vnc");
 367     QemuOpts *opts;
 368
 369     if (strstr(target, "id=")) {
 370         error_setg(errp, "id not supported");
 371         return;
 372     }
 373
 374     opts = qemu_opts_find(olist, "default");
 375     if (opts) {
 376         qemu_opts_del(opts);
 377     }
 378     opts = vnc_parse(target, errp);
 379     if (!opts) {
 380         return;
 381     }
 382
 383     vnc_display_open("default", errp);
 384 }
 385
 386 static void qmp_change_vnc(const char *target, bool has_arg, const char *arg,
 387                            Error **errp)
 388 {
 389     if (strcmp(target, "passwd") == 0 || strcmp(target, "password") == 0) {
 390         if (!has_arg) {
 391             error_setg(errp, QERR_MISSING_PARAMETER, "password");
 392         } else {
 393             qmp_change_vnc_password(arg, errp);
 394         }
 395     } else {
 396         qmp_change_vnc_listen(target, errp);
 397     }
 398 }
 399 #else
 400 void qmp_change_vnc_password(const char *password, Error **errp)
 401 {
 402     error_setg(errp, QERR_FEATURE_DISABLED, "vnc");
 403 }
 404 static void qmp_change_vnc(const char *target, bool has_arg, const char *arg,
 405                            Error **errp)
 406 {
 407     error_setg(errp, QERR_FEATURE_DISABLED, "vnc");
 408 }
 409 #endif /* !CONFIG_VNC */
 410
 411 void qmp_change(const char *device, const char *target,
 412                 bool has_arg, const char *arg, Error **errp)
 413 {
 414     if (strcmp(device, "vnc") == 0) {
 415         qmp_change_vnc(target, has_arg, arg, errp);
 416     } else {
 417         qmp_blockdev_change_medium(device, target, has_arg, arg, false, 0,
 418                                    errp);
 419     }
 420 }
 421
 422 static void qom_list_types_tramp(ObjectClass *klass, void *data)
 423 {
 424     ObjectTypeInfoList *e, **pret = data;
 425     ObjectTypeInfo *info;
 426
 427     info = g_malloc0(sizeof(*info));
 428     info->name = g_strdup(object_class_get_name(klass));
 429
 430     e = g_malloc0(sizeof(*e));
 431     e->value = info;
 432     e->next = *pret;
 433     *pret = e;
 434 }
 435
 436 ObjectTypeInfoList *qmp_qom_list_types(bool has_implements,
 437                                        const char *implements,
 438                                        bool has_abstract,
 439                                        bool abstract,
 440                                        Error **errp)
 441 {
 442     ObjectTypeInfoList *ret = NULL;
 443
 444     object_class_foreach(qom_list_types_tramp, implements, abstract, &ret);
 445
 446     return ret;
 447 }
 448
 449 /* Return a DevicePropertyInfo for a qdev property.
 450  *
 451  * If a qdev property with the given name does not exist, use the given default
 452  * type.  If the qdev property info should not be shown, return NULL.
 453  *
 454  * The caller must free the return value.
 455  */
 456 static DevicePropertyInfo *make_device_property_info(ObjectClass *klass,
 457                                                      const char *name,
 458                                                      const char *default_type,
 459                                                      const char *description)
 460 {
 461     DevicePropertyInfo *info;
 462     Property *prop;
 463
 464     do {
 465         for (prop = DEVICE_CLASS(klass)->props; prop && prop->name; prop++) {
 466             if (strcmp(name, prop->name) != 0) {
 467                 continue;
 468             }
 469
 470             /*
 471              * TODO Properties without a parser are just for dirty hacks.
 472              * qdev_prop_ptr is the only such PropertyInfo.  It's marked
 473              * for removal.  This conditional should be removed along with
 474              * it.
 475              */
 476             if (!prop->info->set) {
 477                 return NULL;           /* no way to set it, don't show */
 478             }
 479
 480             info = g_malloc0(sizeof(*info));
 481             info->name = g_strdup(prop->name);
 482             info->type = g_strdup(prop->info->name);
 483             info->has_description = !!prop->info->description;
 484             info->description = g_strdup(prop->info->description);
 485             return info;
 486         }
 487         klass = object_class_get_parent(klass);
 488     } while (klass != object_class_by_name(TYPE_DEVICE));
 489
 490     /* Not a qdev property, use the default type */
 491     info = g_malloc0(sizeof(*info));
 492     info->name = g_strdup(name);
 493     info->type = g_strdup(default_type);
 494     info->has_description = !!description;
 495     info->description = g_strdup(description);
 496
 497     return info;
 498 }
 499
 500 DevicePropertyInfoList *qmp_device_list_properties(const char *typename,
 501                                                    Error **errp)
 502 {
 503     ObjectClass *klass;
 504     Object *obj;
 505     ObjectProperty *prop;
 506     DevicePropertyInfoList *prop_list = NULL;
 507
 508     klass = object_class_by_name(typename);
 509     if (klass == NULL) {
 510         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 511                   "Device '%s' not found", typename);
 512         return NULL;
 513     }
 514
 515     klass = object_class_dynamic_cast(klass, TYPE_DEVICE);
 516     if (klass == NULL) {
 517         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "name", TYPE_DEVICE);
 518         return NULL;
 519     }
 520
 521     if (object_class_is_abstract(klass)) {
 522         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "name",
 523                    "non-abstract device type");
 524         return NULL;
 525     }
 526
 527     if (DEVICE_CLASS(klass)->cannot_destroy_with_object_finalize_yet) {
 528         error_setg(errp, "Can't list properties of device '%s'", typename);
 529         return NULL;
 530     }
 531
 532     obj = object_new(typename);
 533
 534     QTAILQ_FOREACH(prop, &obj->properties, node) {
 535         DevicePropertyInfo *info;
 536         DevicePropertyInfoList *entry;
 537
 538         /* Skip Object and DeviceState properties */
 539         if (strcmp(prop->name, "type") == 0 ||
 540             strcmp(prop->name, "realized") == 0 ||
 541             strcmp(prop->name, "hotpluggable") == 0 ||
 542             strcmp(prop->name, "hotplugged") == 0 ||
 543             strcmp(prop->name, "parent_bus") == 0) {
 544             continue;
 545         }
 546
 547         /* Skip legacy properties since they are just string versions of
 548          * properties that we already list.
 549          */
 550         if (strstart(prop->name, "legacy-", NULL)) {
 551             continue;
 552         }
 553
 554         info = make_device_property_info(klass, prop->name, prop->type,
 555                                          prop->description);
 556         if (!info) {
 557             continue;
 558         }
 559
 560         entry = g_malloc0(sizeof(*entry));
 561         entry->value = info;
 562         entry->next = prop_list;
 563         prop_list = entry;
 564     }
 565
 566     object_unref(obj);
 567
 568     return prop_list;
 569 }
 570
 571 CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
 572 {
 573     return arch_query_cpu_definitions(errp);
 574 }
 575
 576 void qmp_add_client(const char *protocol, const char *fdname,
 577                     bool has_skipauth, bool skipauth, bool has_tls, bool tls,
 578                     Error **errp)
 579 {
 580     CharDriverState *s;
 581     int fd;
 582
 583     fd = monitor_get_fd(cur_mon, fdname, errp);
 584     if (fd < 0) {
 585         return;
 586     }
 587
 588     if (strcmp(protocol, "spice") == 0) {
 589         if (!qemu_using_spice(errp)) {
 590             close(fd);
 591             return;
 592         }
 593         skipauth = has_skipauth ? skipauth : false;
 594         tls = has_tls ? tls : false;
 595         if (qemu_spice_display_add_client(fd, skipauth, tls) < 0) {
 596             error_setg(errp, "spice failed to add client");
 597             close(fd);
 598         }
 599         return;
 600 #ifdef CONFIG_VNC
 601     } else if (strcmp(protocol, "vnc") == 0) {
 602         skipauth = has_skipauth ? skipauth : false;
 603         vnc_display_add_client(NULL, fd, skipauth);
 604         return;
 605 #endif
 606     } else if ((s = qemu_chr_find(protocol)) != NULL) {
 607         if (qemu_chr_add_client(s, fd) < 0) {
 608             error_setg(errp, "failed to add client");
 609             close(fd);
 610             return;
 611         }
 612         return;
 613     }
 614
 615     error_setg(errp, "protocol '%s' is invalid", protocol);
 616     close(fd);
 617 }
 618
 619 void object_add(const char *type, const char *id, const QDict *qdict,
 620                 Visitor *v, Error **errp)
 621 {
 622     Object *obj;
 623     ObjectClass *klass;
 624     const QDictEntry *e;
 625     Error *local_err = NULL;
 626
 627     klass = object_class_by_name(type);
 628     if (!klass) {
 629         error_setg(errp, "invalid object type: %s", type);
 630         return;
 631     }
 632
 633     if (!object_class_dynamic_cast(klass, TYPE_USER_CREATABLE)) {
 634         error_setg(errp, "object type '%s' isn't supported by object-add",
 635                    type);
 636         return;
 637     }
 638
 639     if (object_class_is_abstract(klass)) {
 640         error_setg(errp, "object type '%s' is abstract", type);
 641         return;
 642     }
 643
 644     obj = object_new(type);
 645     if (qdict) {
 646         for (e = qdict_first(qdict); e; e = qdict_next(qdict, e)) {
 647             object_property_set(obj, v, e->key, &local_err);
 648             if (local_err) {
 649                 goto out;
 650             }
 651         }
 652     }
 653
 654     object_property_add_child(object_get_objects_root(),
 655                               id, obj, &local_err);
 656     if (local_err) {
 657         goto out;
 658     }
 659
 660     user_creatable_complete(obj, &local_err);
 661     if (local_err) {
 662         object_property_del(object_get_objects_root(),
 663                             id, &error_abort);
 664         goto out;
 665     }
 666 out:
 667     if (local_err) {
 668         error_propagate(errp, local_err);
 669     }
 670     object_unref(obj);
 671 }
 672
 673 void qmp_object_add(const char *type, const char *id,
 674                     bool has_props, QObject *props, Error **errp)
 675 {
 676     const QDict *pdict = NULL;
 677     QmpInputVisitor *qiv;
 678
 679     if (props) {
 680         pdict = qobject_to_qdict(props);
 681         if (!pdict) {
 682             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, "props", "dict");
 683             return;
 684         }
 685     }
 686
 687     qiv = qmp_input_visitor_new(props);
 688     object_add(type, id, pdict, qmp_input_get_visitor(qiv), errp);
 689     qmp_input_visitor_cleanup(qiv);
 690 }
 691
 692 void qmp_object_del(const char *id, Error **errp)
 693 {
 694     Object *container;
 695     Object *obj;
 696
 697     container = object_get_objects_root();
 698     obj = object_resolve_path_component(container, id);
 699     if (!obj) {
 700         error_setg(errp, "object id not found");
 701         return;
 702     }
 703
 704     if (!user_creatable_can_be_deleted(USER_CREATABLE(obj), errp)) {
 705         error_setg(errp, "%s is in use, can not be deleted", id);
 706         return;
 707     }
 708     object_unparent(obj);
 709 }
 710
 711 MemoryDeviceInfoList *qmp_query_memory_devices(Error **errp)
 712 {
 713     MemoryDeviceInfoList *head = NULL;
 714     MemoryDeviceInfoList **prev = &head;
 715
 716     qmp_pc_dimm_device_list(qdev_get_machine(), &prev);
 717
 718     return head;
 719 }
 720
 721 ACPIOSTInfoList *qmp_query_acpi_ospm_status(Error **errp)
 722 {
 723     bool ambig;
 724     ACPIOSTInfoList *head = NULL;
 725     ACPIOSTInfoList **prev = &head;
 726     Object *obj = object_resolve_path_type("", TYPE_ACPI_DEVICE_IF, &ambig);
 727
 728     if (obj) {
 729         AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_GET_CLASS(obj);
 730         AcpiDeviceIf *adev = ACPI_DEVICE_IF(obj);
 731
 732         adevc->ospm_status(adev, &prev);
 733     } else {
 734         error_setg(errp, "command is not supported, missing ACPI device");
 735     }
 736
 737     return head;
 738 }