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     const char *tmp;
  53     int err;
  54
  55     info->qemu = g_new0(VersionTriple, 1);
  56     err = qemu_strtoll(version, &tmp, 10, &info->qemu->major);
  57     assert(err == 0);
  58     tmp++;
  59
  60     err = qemu_strtoll(tmp, &tmp, 10, &info->qemu->minor);
  61     assert(err == 0);
  62     tmp++;
  63
  64     err = qemu_strtoll(tmp, &tmp, 10, &info->qemu->micro);
  65     assert(err == 0);
  66     info->package = g_strdup(QEMU_PKGVERSION);
  67
  68     return info;
  69 }
  70
  71 KvmInfo *qmp_query_kvm(Error **errp)
  72 {
  73     KvmInfo *info = g_malloc0(sizeof(*info));
  74
  75     info->enabled = kvm_enabled();
  76     info->present = kvm_available();
  77
  78     return info;
  79 }
  80
  81 UuidInfo *qmp_query_uuid(Error **errp)
  82 {
  83     UuidInfo *info = g_malloc0(sizeof(*info));
  84     char uuid[64];
  85
  86     snprintf(uuid, sizeof(uuid), UUID_FMT, qemu_uuid[0], qemu_uuid[1],
  87                    qemu_uuid[2], qemu_uuid[3], qemu_uuid[4], qemu_uuid[5],
  88                    qemu_uuid[6], qemu_uuid[7], qemu_uuid[8], qemu_uuid[9],
  89                    qemu_uuid[10], qemu_uuid[11], qemu_uuid[12], qemu_uuid[13],
  90                    qemu_uuid[14], qemu_uuid[15]);
  91
  92     info->UUID = g_strdup(uuid);
  93     return info;
  94 }
  95
  96 void qmp_quit(Error **errp)
  97 {
  98     no_shutdown = 0;
  99     qemu_system_shutdown_request();
 100 }
 101
 102 void qmp_stop(Error **errp)
 103 {
 104     if (runstate_check(RUN_STATE_INMIGRATE)) {
 105         autostart = 0;
 106     } else {
 107         vm_stop(RUN_STATE_PAUSED);
 108     }
 109 }
 110
 111 void qmp_system_reset(Error **errp)
 112 {
 113     qemu_system_reset_request();
 114 }
 115
 116 void qmp_system_powerdown(Error **erp)
 117 {
 118     qemu_system_powerdown_request();
 119 }
 120
 121 void qmp_cpu(int64_t index, Error **errp)
 122 {
 123     /* Just do nothing */
 124 }
 125
 126 void qmp_cpu_add(int64_t id, Error **errp)
 127 {
 128     MachineClass *mc;
 129
 130     mc = MACHINE_GET_CLASS(current_machine);
 131     if (mc->hot_add_cpu) {
 132         mc->hot_add_cpu(id, errp);
 133     } else {
 134         error_setg(errp, "Not supported");
 135     }
 136 }
 137
 138 #ifndef CONFIG_VNC
 139 /* If VNC support is enabled, the "true" query-vnc command is
 140    defined in the VNC subsystem */
 141 VncInfo *qmp_query_vnc(Error **errp)
 142 {
 143     error_setg(errp, QERR_FEATURE_DISABLED, "vnc");
 144     return NULL;
 145 };
 146
 147 VncInfo2List *qmp_query_vnc_servers(Error **errp)
 148 {
 149     error_setg(errp, QERR_FEATURE_DISABLED, "vnc");
 150     return NULL;
 151 };
 152 #endif
 153
 154 #ifndef CONFIG_SPICE
 155 /*
 156  * qmp-commands.hx ensures that QMP command query-spice exists only
 157  * #ifdef CONFIG_SPICE.  Necessary for an accurate query-commands
 158  * result.  However, the QAPI schema is blissfully unaware of that,
 159  * and the QAPI code generator happily generates a dead
 160  * qmp_marshal_input_query_spice() that calls qmp_query_spice().
 161  * Provide it one, or else linking fails.
 162  * FIXME Educate the QAPI schema on CONFIG_SPICE.
 163  */
 164 SpiceInfo *qmp_query_spice(Error **errp)
 165 {
 166     abort();
 167 };
 168 #endif
 169
 170 void qmp_cont(Error **errp)
 171 {
 172     Error *local_err = NULL;
 173     BlockDriverState *bs;
 174
 175     if (runstate_needs_reset()) {
 176         error_setg(errp, "Resetting the Virtual Machine is required");
 177         return;
 178     } else if (runstate_check(RUN_STATE_SUSPENDED)) {
 179         return;
 180     }
 181
 182     for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
 183         bdrv_iostatus_reset(bs);
 184     }
 185     for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
 186         bdrv_add_key(bs, NULL, &local_err);
 187         if (local_err) {
 188             error_propagate(errp, local_err);
 189             return;
 190         }
 191     }
 192
 193     if (runstate_check(RUN_STATE_INMIGRATE)) {
 194         autostart = 1;
 195     } else {
 196         vm_start();
 197     }
 198 }
 199
 200 void qmp_system_wakeup(Error **errp)
 201 {
 202     qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
 203 }
 204
 205 ObjectPropertyInfoList *qmp_qom_list(const char *path, Error **errp)
 206 {
 207     Object *obj;
 208     bool ambiguous = false;
 209     ObjectPropertyInfoList *props = NULL;
 210     ObjectProperty *prop;
 211
 212     obj = object_resolve_path(path, &ambiguous);
 213     if (obj == NULL) {
 214         if (ambiguous) {
 215             error_setg(errp, "Path '%s' is ambiguous", path);
 216         } else {
 217             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 218                       "Device '%s' not found", path);
 219         }
 220         return NULL;
 221     }
 222
 223     QTAILQ_FOREACH(prop, &obj->properties, node) {
 224         ObjectPropertyInfoList *entry = g_malloc0(sizeof(*entry));
 225
 226         entry->value = g_malloc0(sizeof(ObjectPropertyInfo));
 227         entry->next = props;
 228         props = entry;
 229
 230         entry->value->name = g_strdup(prop->name);
 231         entry->value->type = g_strdup(prop->type);
 232     }
 233
 234     return props;
 235 }
 236
 237 /* FIXME: teach qapi about how to pass through Visitors */
 238 void qmp_qom_set(QDict *qdict, QObject **ret, Error **errp)
 239 {
 240     const char *path = qdict_get_str(qdict, "path");
 241     const char *property = qdict_get_str(qdict, "property");
 242     QObject *value = qdict_get(qdict, "value");
 243     Object *obj;
 244
 245     obj = object_resolve_path(path, NULL);
 246     if (!obj) {
 247         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 248                   "Device '%s' not found", path);
 249         return;
 250     }
 251
 252     object_property_set_qobject(obj, value, property, errp);
 253 }
 254
 255 void qmp_qom_get(QDict *qdict, QObject **ret, Error **errp)
 256 {
 257     const char *path = qdict_get_str(qdict, "path");
 258     const char *property = qdict_get_str(qdict, "property");
 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;
 266     }
 267
 268     *ret = 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_change_blockdev(device, target, arg, errp);
 421     }
 422 }
 423
 424 static void qom_list_types_tramp(ObjectClass *klass, void *data)
 425 {
 426     ObjectTypeInfoList *e, **pret = data;
 427     ObjectTypeInfo *info;
 428
 429     info = g_malloc0(sizeof(*info));
 430     info->name = g_strdup(object_class_get_name(klass));
 431
 432     e = g_malloc0(sizeof(*e));
 433     e->value = info;
 434     e->next = *pret;
 435     *pret = e;
 436 }
 437
 438 ObjectTypeInfoList *qmp_qom_list_types(bool has_implements,
 439                                        const char *implements,
 440                                        bool has_abstract,
 441                                        bool abstract,
 442                                        Error **errp)
 443 {
 444     ObjectTypeInfoList *ret = NULL;
 445
 446     object_class_foreach(qom_list_types_tramp, implements, abstract, &ret);
 447
 448     return ret;
 449 }
 450
 451 /* Return a DevicePropertyInfo for a qdev property.
 452  *
 453  * If a qdev property with the given name does not exist, use the given default
 454  * type.  If the qdev property info should not be shown, return NULL.
 455  *
 456  * The caller must free the return value.
 457  */
 458 static DevicePropertyInfo *make_device_property_info(ObjectClass *klass,
 459                                                      const char *name,
 460                                                      const char *default_type,
 461                                                      const char *description)
 462 {
 463     DevicePropertyInfo *info;
 464     Property *prop;
 465
 466     do {
 467         for (prop = DEVICE_CLASS(klass)->props; prop && prop->name; prop++) {
 468             if (strcmp(name, prop->name) != 0) {
 469                 continue;
 470             }
 471
 472             /*
 473              * TODO Properties without a parser are just for dirty hacks.
 474              * qdev_prop_ptr is the only such PropertyInfo.  It's marked
 475              * for removal.  This conditional should be removed along with
 476              * it.
 477              */
 478             if (!prop->info->set) {
 479                 return NULL;           /* no way to set it, don't show */
 480             }
 481
 482             info = g_malloc0(sizeof(*info));
 483             info->name = g_strdup(prop->name);
 484             info->type = g_strdup(prop->info->name);
 485             info->has_description = !!prop->info->description;
 486             info->description = g_strdup(prop->info->description);
 487             return info;
 488         }
 489         klass = object_class_get_parent(klass);
 490     } while (klass != object_class_by_name(TYPE_DEVICE));
 491
 492     /* Not a qdev property, use the default type */
 493     info = g_malloc0(sizeof(*info));
 494     info->name = g_strdup(name);
 495     info->type = g_strdup(default_type);
 496     info->has_description = !!description;
 497     info->description = g_strdup(description);
 498
 499     return info;
 500 }
 501
 502 DevicePropertyInfoList *qmp_device_list_properties(const char *typename,
 503                                                    Error **errp)
 504 {
 505     ObjectClass *klass;
 506     Object *obj;
 507     ObjectProperty *prop;
 508     DevicePropertyInfoList *prop_list = NULL;
 509
 510     klass = object_class_by_name(typename);
 511     if (klass == NULL) {
 512         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 513                   "Device '%s' not found", typename);
 514         return NULL;
 515     }
 516
 517     klass = object_class_dynamic_cast(klass, TYPE_DEVICE);
 518     if (klass == NULL) {
 519         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "name", TYPE_DEVICE);
 520         return NULL;
 521     }
 522
 523     obj = object_new(typename);
 524
 525     QTAILQ_FOREACH(prop, &obj->properties, node) {
 526         DevicePropertyInfo *info;
 527         DevicePropertyInfoList *entry;
 528
 529         /* Skip Object and DeviceState properties */
 530         if (strcmp(prop->name, "type") == 0 ||
 531             strcmp(prop->name, "realized") == 0 ||
 532             strcmp(prop->name, "hotpluggable") == 0 ||
 533             strcmp(prop->name, "hotplugged") == 0 ||
 534             strcmp(prop->name, "parent_bus") == 0) {
 535             continue;
 536         }
 537
 538         /* Skip legacy properties since they are just string versions of
 539          * properties that we already list.
 540          */
 541         if (strstart(prop->name, "legacy-", NULL)) {
 542             continue;
 543         }
 544
 545         info = make_device_property_info(klass, prop->name, prop->type,
 546                                          prop->description);
 547         if (!info) {
 548             continue;
 549         }
 550
 551         entry = g_malloc0(sizeof(*entry));
 552         entry->value = info;
 553         entry->next = prop_list;
 554         prop_list = entry;
 555     }
 556
 557     object_unref(obj);
 558
 559     return prop_list;
 560 }
 561
 562 CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
 563 {
 564     return arch_query_cpu_definitions(errp);
 565 }
 566
 567 void qmp_add_client(const char *protocol, const char *fdname,
 568                     bool has_skipauth, bool skipauth, bool has_tls, bool tls,
 569                     Error **errp)
 570 {
 571     CharDriverState *s;
 572     int fd;
 573
 574     fd = monitor_get_fd(cur_mon, fdname, errp);
 575     if (fd < 0) {
 576         return;
 577     }
 578
 579     if (strcmp(protocol, "spice") == 0) {
 580         if (!qemu_using_spice(errp)) {
 581             close(fd);
 582             return;
 583         }
 584         skipauth = has_skipauth ? skipauth : false;
 585         tls = has_tls ? tls : false;
 586         if (qemu_spice_display_add_client(fd, skipauth, tls) < 0) {
 587             error_setg(errp, "spice failed to add client");
 588             close(fd);
 589         }
 590         return;
 591 #ifdef CONFIG_VNC
 592     } else if (strcmp(protocol, "vnc") == 0) {
 593         skipauth = has_skipauth ? skipauth : false;
 594         vnc_display_add_client(NULL, fd, skipauth);
 595         return;
 596 #endif
 597     } else if ((s = qemu_chr_find(protocol)) != NULL) {
 598         if (qemu_chr_add_client(s, fd) < 0) {
 599             error_setg(errp, "failed to add client");
 600             close(fd);
 601             return;
 602         }
 603         return;
 604     }
 605
 606     error_setg(errp, "protocol '%s' is invalid", protocol);
 607     close(fd);
 608 }
 609
 610 void object_add(const char *type, const char *id, const QDict *qdict,
 611                 Visitor *v, Error **errp)
 612 {
 613     Object *obj;
 614     ObjectClass *klass;
 615     const QDictEntry *e;
 616     Error *local_err = NULL;
 617
 618     klass = object_class_by_name(type);
 619     if (!klass) {
 620         error_setg(errp, "invalid object type: %s", type);
 621         return;
 622     }
 623
 624     if (!object_class_dynamic_cast(klass, TYPE_USER_CREATABLE)) {
 625         error_setg(errp, "object type '%s' isn't supported by object-add",
 626                    type);
 627         return;
 628     }
 629
 630     if (object_class_is_abstract(klass)) {
 631         error_setg(errp, "object type '%s' is abstract", type);
 632         return;
 633     }
 634
 635     obj = object_new(type);
 636     if (qdict) {
 637         for (e = qdict_first(qdict); e; e = qdict_next(qdict, e)) {
 638             object_property_set(obj, v, e->key, &local_err);
 639             if (local_err) {
 640                 goto out;
 641             }
 642         }
 643     }
 644
 645     object_property_add_child(object_get_objects_root(),
 646                               id, obj, &local_err);
 647     if (local_err) {
 648         goto out;
 649     }
 650
 651     user_creatable_complete(obj, &local_err);
 652     if (local_err) {
 653         object_property_del(object_get_objects_root(),
 654                             id, &error_abort);
 655         goto out;
 656     }
 657 out:
 658     if (local_err) {
 659         error_propagate(errp, local_err);
 660     }
 661     object_unref(obj);
 662 }
 663
 664 void qmp_object_add(QDict *qdict, QObject **ret, Error **errp)
 665 {
 666     const char *type = qdict_get_str(qdict, "qom-type");
 667     const char *id = qdict_get_str(qdict, "id");
 668     QObject *props = qdict_get(qdict, "props");
 669     const QDict *pdict = NULL;
 670     QmpInputVisitor *qiv;
 671
 672     if (props) {
 673         pdict = qobject_to_qdict(props);
 674         if (!pdict) {
 675             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, "props", "dict");
 676             return;
 677         }
 678     }
 679
 680     qiv = qmp_input_visitor_new(props);
 681     object_add(type, id, pdict, qmp_input_get_visitor(qiv), errp);
 682     qmp_input_visitor_cleanup(qiv);
 683 }
 684
 685 void qmp_object_del(const char *id, Error **errp)
 686 {
 687     Object *container;
 688     Object *obj;
 689
 690     container = object_get_objects_root();
 691     obj = object_resolve_path_component(container, id);
 692     if (!obj) {
 693         error_setg(errp, "object id not found");
 694         return;
 695     }
 696
 697     if (!user_creatable_can_be_deleted(USER_CREATABLE(obj), errp)) {
 698         error_setg(errp, "%s is in use, can not be deleted", id);
 699         return;
 700     }
 701     object_unparent(obj);
 702 }
 703
 704 MemoryDeviceInfoList *qmp_query_memory_devices(Error **errp)
 705 {
 706     MemoryDeviceInfoList *head = NULL;
 707     MemoryDeviceInfoList **prev = &head;
 708
 709     qmp_pc_dimm_device_list(qdev_get_machine(), &prev);
 710
 711     return head;
 712 }
 713
 714 ACPIOSTInfoList *qmp_query_acpi_ospm_status(Error **errp)
 715 {
 716     bool ambig;
 717     ACPIOSTInfoList *head = NULL;
 718     ACPIOSTInfoList **prev = &head;
 719     Object *obj = object_resolve_path_type("", TYPE_ACPI_DEVICE_IF, &ambig);
 720
 721     if (obj) {
 722         AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_GET_CLASS(obj);
 723         AcpiDeviceIf *adev = ACPI_DEVICE_IF(obj);
 724
 725         adevc->ospm_status(adev, &prev);
 726     } else {
 727         error_setg(errp, "command is not supported, missing ACPI device");
 728     }
 729
 730     return head;
 731 }