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