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     /* Continuing after completed migration. Images have been inactivated to
 196      * allow the destination to take control. Need to get control back now. */
 197     if (runstate_check(RUN_STATE_FINISH_MIGRATE) ||
 198         runstate_check(RUN_STATE_POSTMIGRATE))
 199     {
 200         bdrv_invalidate_cache_all(&local_err);
 201         if (local_err) {
 202             error_propagate(errp, local_err);
 203             return;
 204         }
 205     }
 206
 207     if (runstate_check(RUN_STATE_INMIGRATE)) {
 208         autostart = 1;
 209     } else {
 210         vm_start();
 211     }
 212 }
 213
 214 void qmp_system_wakeup(Error **errp)
 215 {
 216     qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
 217 }
 218
 219 ObjectPropertyInfoList *qmp_qom_list(const char *path, Error **errp)
 220 {
 221     Object *obj;
 222     bool ambiguous = false;
 223     ObjectPropertyInfoList *props = NULL;
 224     ObjectProperty *prop;
 225     ObjectPropertyIterator iter;
 226
 227     obj = object_resolve_path(path, &ambiguous);
 228     if (obj == NULL) {
 229         if (ambiguous) {
 230             error_setg(errp, "Path '%s' is ambiguous", path);
 231         } else {
 232             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 233                       "Device '%s' not found", path);
 234         }
 235         return NULL;
 236     }
 237
 238     object_property_iter_init(&iter, obj);
 239     while ((prop = object_property_iter_next(&iter))) {
 240         ObjectPropertyInfoList *entry = g_malloc0(sizeof(*entry));
 241
 242         entry->value = g_malloc0(sizeof(ObjectPropertyInfo));
 243         entry->next = props;
 244         props = entry;
 245
 246         entry->value->name = g_strdup(prop->name);
 247         entry->value->type = g_strdup(prop->type);
 248     }
 249
 250     return props;
 251 }
 252
 253 void qmp_qom_set(const char *path, const char *property, QObject *value,
 254                  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;
 263     }
 264
 265     object_property_set_qobject(obj, value, property, errp);
 266 }
 267
 268 QObject *qmp_qom_get(const char *path, const char *property, Error **errp)
 269 {
 270     Object *obj;
 271
 272     obj = object_resolve_path(path, NULL);
 273     if (!obj) {
 274         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 275                   "Device '%s' not found", path);
 276         return NULL;
 277     }
 278
 279     return object_property_get_qobject(obj, property, errp);
 280 }
 281
 282 void qmp_set_password(const char *protocol, const char *password,
 283                       bool has_connected, const char *connected, Error **errp)
 284 {
 285     int disconnect_if_connected = 0;
 286     int fail_if_connected = 0;
 287     int rc;
 288
 289     if (has_connected) {
 290         if (strcmp(connected, "fail") == 0) {
 291             fail_if_connected = 1;
 292         } else if (strcmp(connected, "disconnect") == 0) {
 293             disconnect_if_connected = 1;
 294         } else if (strcmp(connected, "keep") == 0) {
 295             /* nothing */
 296         } else {
 297             error_setg(errp, QERR_INVALID_PARAMETER, "connected");
 298             return;
 299         }
 300     }
 301
 302     if (strcmp(protocol, "spice") == 0) {
 303         if (!qemu_using_spice(errp)) {
 304             return;
 305         }
 306         rc = qemu_spice_set_passwd(password, fail_if_connected,
 307                                    disconnect_if_connected);
 308         if (rc != 0) {
 309             error_setg(errp, QERR_SET_PASSWD_FAILED);
 310         }
 311         return;
 312     }
 313
 314     if (strcmp(protocol, "vnc") == 0) {
 315         if (fail_if_connected || disconnect_if_connected) {
 316             /* vnc supports "connected=keep" only */
 317             error_setg(errp, QERR_INVALID_PARAMETER, "connected");
 318             return;
 319         }
 320         /* Note that setting an empty password will not disable login through
 321          * this interface. */
 322         rc = vnc_display_password(NULL, password);
 323         if (rc < 0) {
 324             error_setg(errp, QERR_SET_PASSWD_FAILED);
 325         }
 326         return;
 327     }
 328
 329     error_setg(errp, QERR_INVALID_PARAMETER, "protocol");
 330 }
 331
 332 void qmp_expire_password(const char *protocol, const char *whenstr,
 333                          Error **errp)
 334 {
 335     time_t when;
 336     int rc;
 337
 338     if (strcmp(whenstr, "now") == 0) {
 339         when = 0;
 340     } else if (strcmp(whenstr, "never") == 0) {
 341         when = TIME_MAX;
 342     } else if (whenstr[0] == '+') {
 343         when = time(NULL) + strtoull(whenstr+1, NULL, 10);
 344     } else {
 345         when = strtoull(whenstr, NULL, 10);
 346     }
 347
 348     if (strcmp(protocol, "spice") == 0) {
 349         if (!qemu_using_spice(errp)) {
 350             return;
 351         }
 352         rc = qemu_spice_set_pw_expire(when);
 353         if (rc != 0) {
 354             error_setg(errp, QERR_SET_PASSWD_FAILED);
 355         }
 356         return;
 357     }
 358
 359     if (strcmp(protocol, "vnc") == 0) {
 360         rc = vnc_display_pw_expire(NULL, when);
 361         if (rc != 0) {
 362             error_setg(errp, QERR_SET_PASSWD_FAILED);
 363         }
 364         return;
 365     }
 366
 367     error_setg(errp, QERR_INVALID_PARAMETER, "protocol");
 368 }
 369
 370 #ifdef CONFIG_VNC
 371 void qmp_change_vnc_password(const char *password, Error **errp)
 372 {
 373     if (vnc_display_password(NULL, password) < 0) {
 374         error_setg(errp, QERR_SET_PASSWD_FAILED);
 375     }
 376 }
 377
 378 static void qmp_change_vnc_listen(const char *target, Error **errp)
 379 {
 380     QemuOptsList *olist = qemu_find_opts("vnc");
 381     QemuOpts *opts;
 382
 383     if (strstr(target, "id=")) {
 384         error_setg(errp, "id not supported");
 385         return;
 386     }
 387
 388     opts = qemu_opts_find(olist, "default");
 389     if (opts) {
 390         qemu_opts_del(opts);
 391     }
 392     opts = vnc_parse(target, errp);
 393     if (!opts) {
 394         return;
 395     }
 396
 397     vnc_display_open("default", errp);
 398 }
 399
 400 static void qmp_change_vnc(const char *target, bool has_arg, const char *arg,
 401                            Error **errp)
 402 {
 403     if (strcmp(target, "passwd") == 0 || strcmp(target, "password") == 0) {
 404         if (!has_arg) {
 405             error_setg(errp, QERR_MISSING_PARAMETER, "password");
 406         } else {
 407             qmp_change_vnc_password(arg, errp);
 408         }
 409     } else {
 410         qmp_change_vnc_listen(target, errp);
 411     }
 412 }
 413 #else
 414 void qmp_change_vnc_password(const char *password, Error **errp)
 415 {
 416     error_setg(errp, QERR_FEATURE_DISABLED, "vnc");
 417 }
 418 static void qmp_change_vnc(const char *target, bool has_arg, const char *arg,
 419                            Error **errp)
 420 {
 421     error_setg(errp, QERR_FEATURE_DISABLED, "vnc");
 422 }
 423 #endif /* !CONFIG_VNC */
 424
 425 void qmp_change(const char *device, const char *target,
 426                 bool has_arg, const char *arg, Error **errp)
 427 {
 428     if (strcmp(device, "vnc") == 0) {
 429         qmp_change_vnc(target, has_arg, arg, errp);
 430     } else {
 431         qmp_blockdev_change_medium(device, target, has_arg, arg, false, 0,
 432                                    errp);
 433     }
 434 }
 435
 436 static void qom_list_types_tramp(ObjectClass *klass, void *data)
 437 {
 438     ObjectTypeInfoList *e, **pret = data;
 439     ObjectTypeInfo *info;
 440
 441     info = g_malloc0(sizeof(*info));
 442     info->name = g_strdup(object_class_get_name(klass));
 443
 444     e = g_malloc0(sizeof(*e));
 445     e->value = info;
 446     e->next = *pret;
 447     *pret = e;
 448 }
 449
 450 ObjectTypeInfoList *qmp_qom_list_types(bool has_implements,
 451                                        const char *implements,
 452                                        bool has_abstract,
 453                                        bool abstract,
 454                                        Error **errp)
 455 {
 456     ObjectTypeInfoList *ret = NULL;
 457
 458     object_class_foreach(qom_list_types_tramp, implements, abstract, &ret);
 459
 460     return ret;
 461 }
 462
 463 /* Return a DevicePropertyInfo for a qdev property.
 464  *
 465  * If a qdev property with the given name does not exist, use the given default
 466  * type.  If the qdev property info should not be shown, return NULL.
 467  *
 468  * The caller must free the return value.
 469  */
 470 static DevicePropertyInfo *make_device_property_info(ObjectClass *klass,
 471                                                      const char *name,
 472                                                      const char *default_type,
 473                                                      const char *description)
 474 {
 475     DevicePropertyInfo *info;
 476     Property *prop;
 477
 478     do {
 479         for (prop = DEVICE_CLASS(klass)->props; prop && prop->name; prop++) {
 480             if (strcmp(name, prop->name) != 0) {
 481                 continue;
 482             }
 483
 484             /*
 485              * TODO Properties without a parser are just for dirty hacks.
 486              * qdev_prop_ptr is the only such PropertyInfo.  It's marked
 487              * for removal.  This conditional should be removed along with
 488              * it.
 489              */
 490             if (!prop->info->set) {
 491                 return NULL;           /* no way to set it, don't show */
 492             }
 493
 494             info = g_malloc0(sizeof(*info));
 495             info->name = g_strdup(prop->name);
 496             info->type = g_strdup(prop->info->name);
 497             info->has_description = !!prop->info->description;
 498             info->description = g_strdup(prop->info->description);
 499             return info;
 500         }
 501         klass = object_class_get_parent(klass);
 502     } while (klass != object_class_by_name(TYPE_DEVICE));
 503
 504     /* Not a qdev property, use the default type */
 505     info = g_malloc0(sizeof(*info));
 506     info->name = g_strdup(name);
 507     info->type = g_strdup(default_type);
 508     info->has_description = !!description;
 509     info->description = g_strdup(description);
 510
 511     return info;
 512 }
 513
 514 DevicePropertyInfoList *qmp_device_list_properties(const char *typename,
 515                                                    Error **errp)
 516 {
 517     ObjectClass *klass;
 518     Object *obj;
 519     ObjectProperty *prop;
 520     ObjectPropertyIterator iter;
 521     DevicePropertyInfoList *prop_list = NULL;
 522
 523     klass = object_class_by_name(typename);
 524     if (klass == NULL) {
 525         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 526                   "Device '%s' not found", typename);
 527         return NULL;
 528     }
 529
 530     klass = object_class_dynamic_cast(klass, TYPE_DEVICE);
 531     if (klass == NULL) {
 532         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "name", TYPE_DEVICE);
 533         return NULL;
 534     }
 535
 536     if (object_class_is_abstract(klass)) {
 537         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "name",
 538                    "non-abstract device type");
 539         return NULL;
 540     }
 541
 542     if (DEVICE_CLASS(klass)->cannot_destroy_with_object_finalize_yet) {
 543         error_setg(errp, "Can't list properties of device '%s'", typename);
 544         return NULL;
 545     }
 546
 547     obj = object_new(typename);
 548
 549     object_property_iter_init(&iter, obj);
 550     while ((prop = object_property_iter_next(&iter))) {
 551         DevicePropertyInfo *info;
 552         DevicePropertyInfoList *entry;
 553
 554         /* Skip Object and DeviceState properties */
 555         if (strcmp(prop->name, "type") == 0 ||
 556             strcmp(prop->name, "realized") == 0 ||
 557             strcmp(prop->name, "hotpluggable") == 0 ||
 558             strcmp(prop->name, "hotplugged") == 0 ||
 559             strcmp(prop->name, "parent_bus") == 0) {
 560             continue;
 561         }
 562
 563         /* Skip legacy properties since they are just string versions of
 564          * properties that we already list.
 565          */
 566         if (strstart(prop->name, "legacy-", NULL)) {
 567             continue;
 568         }
 569
 570         info = make_device_property_info(klass, prop->name, prop->type,
 571                                          prop->description);
 572         if (!info) {
 573             continue;
 574         }
 575
 576         entry = g_malloc0(sizeof(*entry));
 577         entry->value = info;
 578         entry->next = prop_list;
 579         prop_list = entry;
 580     }
 581
 582     object_unref(obj);
 583
 584     return prop_list;
 585 }
 586
 587 CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
 588 {
 589     return arch_query_cpu_definitions(errp);
 590 }
 591
 592 void qmp_add_client(const char *protocol, const char *fdname,
 593                     bool has_skipauth, bool skipauth, bool has_tls, bool tls,
 594                     Error **errp)
 595 {
 596     CharDriverState *s;
 597     int fd;
 598
 599     fd = monitor_get_fd(cur_mon, fdname, errp);
 600     if (fd < 0) {
 601         return;
 602     }
 603
 604     if (strcmp(protocol, "spice") == 0) {
 605         if (!qemu_using_spice(errp)) {
 606             close(fd);
 607             return;
 608         }
 609         skipauth = has_skipauth ? skipauth : false;
 610         tls = has_tls ? tls : false;
 611         if (qemu_spice_display_add_client(fd, skipauth, tls) < 0) {
 612             error_setg(errp, "spice failed to add client");
 613             close(fd);
 614         }
 615         return;
 616 #ifdef CONFIG_VNC
 617     } else if (strcmp(protocol, "vnc") == 0) {
 618         skipauth = has_skipauth ? skipauth : false;
 619         vnc_display_add_client(NULL, fd, skipauth);
 620         return;
 621 #endif
 622     } else if ((s = qemu_chr_find(protocol)) != NULL) {
 623         if (qemu_chr_add_client(s, fd) < 0) {
 624             error_setg(errp, "failed to add client");
 625             close(fd);
 626             return;
 627         }
 628         return;
 629     }
 630
 631     error_setg(errp, "protocol '%s' is invalid", protocol);
 632     close(fd);
 633 }
 634
 635 void object_add(const char *type, const char *id, const QDict *qdict,
 636                 Visitor *v, Error **errp)
 637 {
 638     Object *obj;
 639     ObjectClass *klass;
 640     const QDictEntry *e;
 641     Error *local_err = NULL;
 642
 643     klass = object_class_by_name(type);
 644     if (!klass) {
 645         error_setg(errp, "invalid object type: %s", type);
 646         return;
 647     }
 648
 649     if (!object_class_dynamic_cast(klass, TYPE_USER_CREATABLE)) {
 650         error_setg(errp, "object type '%s' isn't supported by object-add",
 651                    type);
 652         return;
 653     }
 654
 655     if (object_class_is_abstract(klass)) {
 656         error_setg(errp, "object type '%s' is abstract", type);
 657         return;
 658     }
 659
 660     obj = object_new(type);
 661     if (qdict) {
 662         for (e = qdict_first(qdict); e; e = qdict_next(qdict, e)) {
 663             object_property_set(obj, v, e->key, &local_err);
 664             if (local_err) {
 665                 goto out;
 666             }
 667         }
 668     }
 669
 670     object_property_add_child(object_get_objects_root(),
 671                               id, obj, &local_err);
 672     if (local_err) {
 673         goto out;
 674     }
 675
 676     user_creatable_complete(obj, &local_err);
 677     if (local_err) {
 678         object_property_del(object_get_objects_root(),
 679                             id, &error_abort);
 680         goto out;
 681     }
 682 out:
 683     if (local_err) {
 684         error_propagate(errp, local_err);
 685     }
 686     object_unref(obj);
 687 }
 688
 689 void qmp_object_add(const char *type, const char *id,
 690                     bool has_props, QObject *props, Error **errp)
 691 {
 692     const QDict *pdict = NULL;
 693     QmpInputVisitor *qiv;
 694
 695     if (props) {
 696         pdict = qobject_to_qdict(props);
 697         if (!pdict) {
 698             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, "props", "dict");
 699             return;
 700         }
 701     }
 702
 703     qiv = qmp_input_visitor_new(props);
 704     object_add(type, id, pdict, qmp_input_get_visitor(qiv), errp);
 705     qmp_input_visitor_cleanup(qiv);
 706 }
 707
 708 void qmp_object_del(const char *id, Error **errp)
 709 {
 710     Object *container;
 711     Object *obj;
 712
 713     container = object_get_objects_root();
 714     obj = object_resolve_path_component(container, id);
 715     if (!obj) {
 716         error_setg(errp, "object id not found");
 717         return;
 718     }
 719
 720     if (!user_creatable_can_be_deleted(USER_CREATABLE(obj), errp)) {
 721         error_setg(errp, "%s is in use, can not be deleted", id);
 722         return;
 723     }
 724     object_unparent(obj);
 725 }
 726
 727 MemoryDeviceInfoList *qmp_query_memory_devices(Error **errp)
 728 {
 729     MemoryDeviceInfoList *head = NULL;
 730     MemoryDeviceInfoList **prev = &head;
 731
 732     qmp_pc_dimm_device_list(qdev_get_machine(), &prev);
 733
 734     return head;
 735 }
 736
 737 ACPIOSTInfoList *qmp_query_acpi_ospm_status(Error **errp)
 738 {
 739     bool ambig;
 740     ACPIOSTInfoList *head = NULL;
 741     ACPIOSTInfoList **prev = &head;
 742     Object *obj = object_resolve_path_type("", TYPE_ACPI_DEVICE_IF, &ambig);
 743
 744     if (obj) {
 745         AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_GET_CLASS(obj);
 746         AcpiDeviceIf *adev = ACPI_DEVICE_IF(obj);
 747
 748         adevc->ospm_status(adev, &prev);
 749     } else {
 750         error_setg(errp, "command is not supported, missing ACPI device");
 751     }
 752
 753     return head;
 754 }