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     ObjectPropertyIterator *iter;
 214
 215     obj = object_resolve_path(path, &ambiguous);
 216     if (obj == NULL) {
 217         if (ambiguous) {
 218             error_setg(errp, "Path '%s' is ambiguous", path);
 219         } else {
 220             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 221                       "Device '%s' not found", path);
 222         }
 223         return NULL;
 224     }
 225
 226     iter = object_property_iter_init(obj);
 227     while ((prop = object_property_iter_next(iter))) {
 228         ObjectPropertyInfoList *entry = g_malloc0(sizeof(*entry));
 229
 230         entry->value = g_malloc0(sizeof(ObjectPropertyInfo));
 231         entry->next = props;
 232         props = entry;
 233
 234         entry->value->name = g_strdup(prop->name);
 235         entry->value->type = g_strdup(prop->type);
 236     }
 237     object_property_iter_free(iter);
 238
 239     return props;
 240 }
 241
 242 void qmp_qom_set(const char *path, const char *property, QObject *value,
 243                  Error **errp)
 244 {
 245     Object *obj;
 246
 247     obj = object_resolve_path(path, NULL);
 248     if (!obj) {
 249         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 250                   "Device '%s' not found", path);
 251         return;
 252     }
 253
 254     object_property_set_qobject(obj, value, property, errp);
 255 }
 256
 257 QObject *qmp_qom_get(const char *path, const char *property, Error **errp)
 258 {
 259     Object *obj;
 260
 261     obj = object_resolve_path(path, NULL);
 262     if (!obj) {
 263         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 264                   "Device '%s' not found", path);
 265         return NULL;
 266     }
 267
 268     return object_property_get_qobject(obj, property, errp);
 269 }
 270
 271 void qmp_set_password(const char *protocol, const char *password,
 272                       bool has_connected, const char *connected, Error **errp)
 273 {
 274     int disconnect_if_connected = 0;
 275     int fail_if_connected = 0;
 276     int rc;
 277
 278     if (has_connected) {
 279         if (strcmp(connected, "fail") == 0) {
 280             fail_if_connected = 1;
 281         } else if (strcmp(connected, "disconnect") == 0) {
 282             disconnect_if_connected = 1;
 283         } else if (strcmp(connected, "keep") == 0) {
 284             /* nothing */
 285         } else {
 286             error_setg(errp, QERR_INVALID_PARAMETER, "connected");
 287             return;
 288         }
 289     }
 290
 291     if (strcmp(protocol, "spice") == 0) {
 292         if (!qemu_using_spice(errp)) {
 293             return;
 294         }
 295         rc = qemu_spice_set_passwd(password, fail_if_connected,
 296                                    disconnect_if_connected);
 297         if (rc != 0) {
 298             error_setg(errp, QERR_SET_PASSWD_FAILED);
 299         }
 300         return;
 301     }
 302
 303     if (strcmp(protocol, "vnc") == 0) {
 304         if (fail_if_connected || disconnect_if_connected) {
 305             /* vnc supports "connected=keep" only */
 306             error_setg(errp, QERR_INVALID_PARAMETER, "connected");
 307             return;
 308         }
 309         /* Note that setting an empty password will not disable login through
 310          * this interface. */
 311         rc = vnc_display_password(NULL, password);
 312         if (rc < 0) {
 313             error_setg(errp, QERR_SET_PASSWD_FAILED);
 314         }
 315         return;
 316     }
 317
 318     error_setg(errp, QERR_INVALID_PARAMETER, "protocol");
 319 }
 320
 321 void qmp_expire_password(const char *protocol, const char *whenstr,
 322                          Error **errp)
 323 {
 324     time_t when;
 325     int rc;
 326
 327     if (strcmp(whenstr, "now") == 0) {
 328         when = 0;
 329     } else if (strcmp(whenstr, "never") == 0) {
 330         when = TIME_MAX;
 331     } else if (whenstr[0] == '+') {
 332         when = time(NULL) + strtoull(whenstr+1, NULL, 10);
 333     } else {
 334         when = strtoull(whenstr, NULL, 10);
 335     }
 336
 337     if (strcmp(protocol, "spice") == 0) {
 338         if (!qemu_using_spice(errp)) {
 339             return;
 340         }
 341         rc = qemu_spice_set_pw_expire(when);
 342         if (rc != 0) {
 343             error_setg(errp, QERR_SET_PASSWD_FAILED);
 344         }
 345         return;
 346     }
 347
 348     if (strcmp(protocol, "vnc") == 0) {
 349         rc = vnc_display_pw_expire(NULL, when);
 350         if (rc != 0) {
 351             error_setg(errp, QERR_SET_PASSWD_FAILED);
 352         }
 353         return;
 354     }
 355
 356     error_setg(errp, QERR_INVALID_PARAMETER, "protocol");
 357 }
 358
 359 #ifdef CONFIG_VNC
 360 void qmp_change_vnc_password(const char *password, Error **errp)
 361 {
 362     if (vnc_display_password(NULL, password) < 0) {
 363         error_setg(errp, QERR_SET_PASSWD_FAILED);
 364     }
 365 }
 366
 367 static void qmp_change_vnc_listen(const char *target, Error **errp)
 368 {
 369     QemuOptsList *olist = qemu_find_opts("vnc");
 370     QemuOpts *opts;
 371
 372     if (strstr(target, "id=")) {
 373         error_setg(errp, "id not supported");
 374         return;
 375     }
 376
 377     opts = qemu_opts_find(olist, "default");
 378     if (opts) {
 379         qemu_opts_del(opts);
 380     }
 381     opts = vnc_parse(target, errp);
 382     if (!opts) {
 383         return;
 384     }
 385
 386     vnc_display_open("default", errp);
 387 }
 388
 389 static void qmp_change_vnc(const char *target, bool has_arg, const char *arg,
 390                            Error **errp)
 391 {
 392     if (strcmp(target, "passwd") == 0 || strcmp(target, "password") == 0) {
 393         if (!has_arg) {
 394             error_setg(errp, QERR_MISSING_PARAMETER, "password");
 395         } else {
 396             qmp_change_vnc_password(arg, errp);
 397         }
 398     } else {
 399         qmp_change_vnc_listen(target, errp);
 400     }
 401 }
 402 #else
 403 void qmp_change_vnc_password(const char *password, Error **errp)
 404 {
 405     error_setg(errp, QERR_FEATURE_DISABLED, "vnc");
 406 }
 407 static void qmp_change_vnc(const char *target, bool has_arg, const char *arg,
 408                            Error **errp)
 409 {
 410     error_setg(errp, QERR_FEATURE_DISABLED, "vnc");
 411 }
 412 #endif /* !CONFIG_VNC */
 413
 414 void qmp_change(const char *device, const char *target,
 415                 bool has_arg, const char *arg, Error **errp)
 416 {
 417     if (strcmp(device, "vnc") == 0) {
 418         qmp_change_vnc(target, has_arg, arg, errp);
 419     } else {
 420         qmp_blockdev_change_medium(device, target, has_arg, arg, false, 0,
 421                                    errp);
 422     }
 423 }
 424
 425 static void qom_list_types_tramp(ObjectClass *klass, void *data)
 426 {
 427     ObjectTypeInfoList *e, **pret = data;
 428     ObjectTypeInfo *info;
 429
 430     info = g_malloc0(sizeof(*info));
 431     info->name = g_strdup(object_class_get_name(klass));
 432
 433     e = g_malloc0(sizeof(*e));
 434     e->value = info;
 435     e->next = *pret;
 436     *pret = e;
 437 }
 438
 439 ObjectTypeInfoList *qmp_qom_list_types(bool has_implements,
 440                                        const char *implements,
 441                                        bool has_abstract,
 442                                        bool abstract,
 443                                        Error **errp)
 444 {
 445     ObjectTypeInfoList *ret = NULL;
 446
 447     object_class_foreach(qom_list_types_tramp, implements, abstract, &ret);
 448
 449     return ret;
 450 }
 451
 452 /* Return a DevicePropertyInfo for a qdev property.
 453  *
 454  * If a qdev property with the given name does not exist, use the given default
 455  * type.  If the qdev property info should not be shown, return NULL.
 456  *
 457  * The caller must free the return value.
 458  */
 459 static DevicePropertyInfo *make_device_property_info(ObjectClass *klass,
 460                                                      const char *name,
 461                                                      const char *default_type,
 462                                                      const char *description)
 463 {
 464     DevicePropertyInfo *info;
 465     Property *prop;
 466
 467     do {
 468         for (prop = DEVICE_CLASS(klass)->props; prop && prop->name; prop++) {
 469             if (strcmp(name, prop->name) != 0) {
 470                 continue;
 471             }
 472
 473             /*
 474              * TODO Properties without a parser are just for dirty hacks.
 475              * qdev_prop_ptr is the only such PropertyInfo.  It's marked
 476              * for removal.  This conditional should be removed along with
 477              * it.
 478              */
 479             if (!prop->info->set) {
 480                 return NULL;           /* no way to set it, don't show */
 481             }
 482
 483             info = g_malloc0(sizeof(*info));
 484             info->name = g_strdup(prop->name);
 485             info->type = g_strdup(prop->info->name);
 486             info->has_description = !!prop->info->description;
 487             info->description = g_strdup(prop->info->description);
 488             return info;
 489         }
 490         klass = object_class_get_parent(klass);
 491     } while (klass != object_class_by_name(TYPE_DEVICE));
 492
 493     /* Not a qdev property, use the default type */
 494     info = g_malloc0(sizeof(*info));
 495     info->name = g_strdup(name);
 496     info->type = g_strdup(default_type);
 497     info->has_description = !!description;
 498     info->description = g_strdup(description);
 499
 500     return info;
 501 }
 502
 503 DevicePropertyInfoList *qmp_device_list_properties(const char *typename,
 504                                                    Error **errp)
 505 {
 506     ObjectClass *klass;
 507     Object *obj;
 508     ObjectProperty *prop;
 509     ObjectPropertyIterator *iter;
 510     DevicePropertyInfoList *prop_list = NULL;
 511
 512     klass = object_class_by_name(typename);
 513     if (klass == NULL) {
 514         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 515                   "Device '%s' not found", typename);
 516         return NULL;
 517     }
 518
 519     klass = object_class_dynamic_cast(klass, TYPE_DEVICE);
 520     if (klass == NULL) {
 521         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "name", TYPE_DEVICE);
 522         return NULL;
 523     }
 524
 525     if (object_class_is_abstract(klass)) {
 526         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "name",
 527                    "non-abstract device type");
 528         return NULL;
 529     }
 530
 531     if (DEVICE_CLASS(klass)->cannot_destroy_with_object_finalize_yet) {
 532         error_setg(errp, "Can't list properties of device '%s'", typename);
 533         return NULL;
 534     }
 535
 536     obj = object_new(typename);
 537
 538     iter = object_property_iter_init(obj);
 539     while ((prop = object_property_iter_next(iter))) {
 540         DevicePropertyInfo *info;
 541         DevicePropertyInfoList *entry;
 542
 543         /* Skip Object and DeviceState properties */
 544         if (strcmp(prop->name, "type") == 0 ||
 545             strcmp(prop->name, "realized") == 0 ||
 546             strcmp(prop->name, "hotpluggable") == 0 ||
 547             strcmp(prop->name, "hotplugged") == 0 ||
 548             strcmp(prop->name, "parent_bus") == 0) {
 549             continue;
 550         }
 551
 552         /* Skip legacy properties since they are just string versions of
 553          * properties that we already list.
 554          */
 555         if (strstart(prop->name, "legacy-", NULL)) {
 556             continue;
 557         }
 558
 559         info = make_device_property_info(klass, prop->name, prop->type,
 560                                          prop->description);
 561         if (!info) {
 562             continue;
 563         }
 564
 565         entry = g_malloc0(sizeof(*entry));
 566         entry->value = info;
 567         entry->next = prop_list;
 568         prop_list = entry;
 569     }
 570     object_property_iter_free(iter);
 571
 572     object_unref(obj);
 573
 574     return prop_list;
 575 }
 576
 577 CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
 578 {
 579     return arch_query_cpu_definitions(errp);
 580 }
 581
 582 void qmp_add_client(const char *protocol, const char *fdname,
 583                     bool has_skipauth, bool skipauth, bool has_tls, bool tls,
 584                     Error **errp)
 585 {
 586     CharDriverState *s;
 587     int fd;
 588
 589     fd = monitor_get_fd(cur_mon, fdname, errp);
 590     if (fd < 0) {
 591         return;
 592     }
 593
 594     if (strcmp(protocol, "spice") == 0) {
 595         if (!qemu_using_spice(errp)) {
 596             close(fd);
 597             return;
 598         }
 599         skipauth = has_skipauth ? skipauth : false;
 600         tls = has_tls ? tls : false;
 601         if (qemu_spice_display_add_client(fd, skipauth, tls) < 0) {
 602             error_setg(errp, "spice failed to add client");
 603             close(fd);
 604         }
 605         return;
 606 #ifdef CONFIG_VNC
 607     } else if (strcmp(protocol, "vnc") == 0) {
 608         skipauth = has_skipauth ? skipauth : false;
 609         vnc_display_add_client(NULL, fd, skipauth);
 610         return;
 611 #endif
 612     } else if ((s = qemu_chr_find(protocol)) != NULL) {
 613         if (qemu_chr_add_client(s, fd) < 0) {
 614             error_setg(errp, "failed to add client");
 615             close(fd);
 616             return;
 617         }
 618         return;
 619     }
 620
 621     error_setg(errp, "protocol '%s' is invalid", protocol);
 622     close(fd);
 623 }
 624
 625 void object_add(const char *type, const char *id, const QDict *qdict,
 626                 Visitor *v, Error **errp)
 627 {
 628     Object *obj;
 629     ObjectClass *klass;
 630     const QDictEntry *e;
 631     Error *local_err = NULL;
 632
 633     klass = object_class_by_name(type);
 634     if (!klass) {
 635         error_setg(errp, "invalid object type: %s", type);
 636         return;
 637     }
 638
 639     if (!object_class_dynamic_cast(klass, TYPE_USER_CREATABLE)) {
 640         error_setg(errp, "object type '%s' isn't supported by object-add",
 641                    type);
 642         return;
 643     }
 644
 645     if (object_class_is_abstract(klass)) {
 646         error_setg(errp, "object type '%s' is abstract", type);
 647         return;
 648     }
 649
 650     obj = object_new(type);
 651     if (qdict) {
 652         for (e = qdict_first(qdict); e; e = qdict_next(qdict, e)) {
 653             object_property_set(obj, v, e->key, &local_err);
 654             if (local_err) {
 655                 goto out;
 656             }
 657         }
 658     }
 659
 660     object_property_add_child(object_get_objects_root(),
 661                               id, obj, &local_err);
 662     if (local_err) {
 663         goto out;
 664     }
 665
 666     user_creatable_complete(obj, &local_err);
 667     if (local_err) {
 668         object_property_del(object_get_objects_root(),
 669                             id, &error_abort);
 670         goto out;
 671     }
 672 out:
 673     if (local_err) {
 674         error_propagate(errp, local_err);
 675     }
 676     object_unref(obj);
 677 }
 678
 679 void qmp_object_add(const char *type, const char *id,
 680                     bool has_props, QObject *props, Error **errp)
 681 {
 682     const QDict *pdict = NULL;
 683     QmpInputVisitor *qiv;
 684
 685     if (props) {
 686         pdict = qobject_to_qdict(props);
 687         if (!pdict) {
 688             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, "props", "dict");
 689             return;
 690         }
 691     }
 692
 693     qiv = qmp_input_visitor_new(props);
 694     object_add(type, id, pdict, qmp_input_get_visitor(qiv), errp);
 695     qmp_input_visitor_cleanup(qiv);
 696 }
 697
 698 void qmp_object_del(const char *id, Error **errp)
 699 {
 700     Object *container;
 701     Object *obj;
 702
 703     container = object_get_objects_root();
 704     obj = object_resolve_path_component(container, id);
 705     if (!obj) {
 706         error_setg(errp, "object id not found");
 707         return;
 708     }
 709
 710     if (!user_creatable_can_be_deleted(USER_CREATABLE(obj), errp)) {
 711         error_setg(errp, "%s is in use, can not be deleted", id);
 712         return;
 713     }
 714     object_unparent(obj);
 715 }
 716
 717 MemoryDeviceInfoList *qmp_query_memory_devices(Error **errp)
 718 {
 719     MemoryDeviceInfoList *head = NULL;
 720     MemoryDeviceInfoList **prev = &head;
 721
 722     qmp_pc_dimm_device_list(qdev_get_machine(), &prev);
 723
 724     return head;
 725 }
 726
 727 ACPIOSTInfoList *qmp_query_acpi_ospm_status(Error **errp)
 728 {
 729     bool ambig;
 730     ACPIOSTInfoList *head = NULL;
 731     ACPIOSTInfoList **prev = &head;
 732     Object *obj = object_resolve_path_type("", TYPE_ACPI_DEVICE_IF, &ambig);
 733
 734     if (obj) {
 735         AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_GET_CLASS(obj);
 736         AcpiDeviceIf *adev = ACPI_DEVICE_IF(obj);
 737
 738         adevc->ospm_status(adev, &prev);
 739     } else {
 740         error_setg(errp, "command is not supported, missing ACPI device");
 741     }
 742
 743     return head;
 744 }