system/qdev-monitor.c

   1 /*
   2  *  Dynamic device configuration and creation.
   3  *
   4  *  Copyright (c) 2009 CodeSourcery
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "hw/sysbus.h"
  22 #include "monitor/hmp.h"
  23 #include "monitor/monitor.h"
  24 #include "monitor/qdev.h"
  25 #include "sysemu/arch_init.h"
  26 #include "qapi/error.h"
  27 #include "qapi/qapi-commands-qdev.h"
  28 #include "qapi/qmp/dispatch.h"
  29 #include "qapi/qmp/qdict.h"
  30 #include "qapi/qmp/qerror.h"
  31 #include "qapi/qmp/qstring.h"
  32 #include "qapi/qobject-input-visitor.h"
  33 #include "qemu/config-file.h"
  34 #include "qemu/error-report.h"
  35 #include "qemu/help_option.h"
  36 #include "qemu/option.h"
  37 #include "qemu/qemu-print.h"
  38 #include "qemu/option_int.h"
  39 #include "sysemu/block-backend.h"
  40 #include "migration/misc.h"
  41 #include "qemu/cutils.h"
  42 #include "hw/qdev-properties.h"
  43 #include "hw/clock.h"
  44 #include "hw/boards.h"
  45
  46 /*
  47  * Aliases were a bad idea from the start.  Let's keep them
  48  * from spreading further.
  49  */
  50 typedef struct QDevAlias
  51 {
  52     const char *typename;
  53     const char *alias;
  54     uint32_t arch_mask;
  55 } QDevAlias;
  56
  57 /* default virtio transport per architecture */
  58 #define QEMU_ARCH_VIRTIO_PCI (QEMU_ARCH_ALPHA | QEMU_ARCH_ARM | \
  59                               QEMU_ARCH_HPPA | QEMU_ARCH_I386 | \
  60                               QEMU_ARCH_MIPS | QEMU_ARCH_PPC |  \
  61                               QEMU_ARCH_RISCV | QEMU_ARCH_SH4 | \
  62                               QEMU_ARCH_SPARC | QEMU_ARCH_XTENSA | \
  63                               QEMU_ARCH_LOONGARCH)
  64 #define QEMU_ARCH_VIRTIO_CCW (QEMU_ARCH_S390X)
  65 #define QEMU_ARCH_VIRTIO_MMIO (QEMU_ARCH_M68K)
  66
  67 /* Please keep this table sorted by typename. */
  68 static const QDevAlias qdev_alias_table[] = {
  69     { "AC97", "ac97" }, /* -soundhw name */
  70     { "e1000", "e1000-82540em" },
  71     { "ES1370", "es1370" }, /* -soundhw name */
  72     { "ich9-ahci", "ahci" },
  73     { "lsi53c895a", "lsi" },
  74     { "virtio-9p-device", "virtio-9p", QEMU_ARCH_VIRTIO_MMIO },
  75     { "virtio-9p-ccw", "virtio-9p", QEMU_ARCH_VIRTIO_CCW },
  76     { "virtio-9p-pci", "virtio-9p", QEMU_ARCH_VIRTIO_PCI },
  77     { "virtio-balloon-device", "virtio-balloon", QEMU_ARCH_VIRTIO_MMIO },
  78     { "virtio-balloon-ccw", "virtio-balloon", QEMU_ARCH_VIRTIO_CCW },
  79     { "virtio-balloon-pci", "virtio-balloon", QEMU_ARCH_VIRTIO_PCI },
  80     { "virtio-blk-device", "virtio-blk", QEMU_ARCH_VIRTIO_MMIO },
  81     { "virtio-blk-ccw", "virtio-blk", QEMU_ARCH_VIRTIO_CCW },
  82     { "virtio-blk-pci", "virtio-blk", QEMU_ARCH_VIRTIO_PCI },
  83     { "virtio-gpu-device", "virtio-gpu", QEMU_ARCH_VIRTIO_MMIO },
  84     { "virtio-gpu-ccw", "virtio-gpu", QEMU_ARCH_VIRTIO_CCW },
  85     { "virtio-gpu-pci", "virtio-gpu", QEMU_ARCH_VIRTIO_PCI },
  86     { "virtio-gpu-gl-device", "virtio-gpu-gl", QEMU_ARCH_VIRTIO_MMIO },
  87     { "virtio-gpu-gl-pci", "virtio-gpu-gl", QEMU_ARCH_VIRTIO_PCI },
  88     { "virtio-gpu-rutabaga-device", "virtio-gpu-rutabaga",
  89       QEMU_ARCH_VIRTIO_MMIO },
  90     { "virtio-gpu-rutabaga-pci", "virtio-gpu-rutabaga", QEMU_ARCH_VIRTIO_PCI },
  91     { "virtio-input-host-device", "virtio-input-host", QEMU_ARCH_VIRTIO_MMIO },
  92     { "virtio-input-host-ccw", "virtio-input-host", QEMU_ARCH_VIRTIO_CCW },
  93     { "virtio-input-host-pci", "virtio-input-host", QEMU_ARCH_VIRTIO_PCI },
  94     { "virtio-iommu-pci", "virtio-iommu", QEMU_ARCH_VIRTIO_PCI },
  95     { "virtio-keyboard-device", "virtio-keyboard", QEMU_ARCH_VIRTIO_MMIO },
  96     { "virtio-keyboard-ccw", "virtio-keyboard", QEMU_ARCH_VIRTIO_CCW },
  97     { "virtio-keyboard-pci", "virtio-keyboard", QEMU_ARCH_VIRTIO_PCI },
  98     { "virtio-mouse-device", "virtio-mouse", QEMU_ARCH_VIRTIO_MMIO },
  99     { "virtio-mouse-ccw", "virtio-mouse", QEMU_ARCH_VIRTIO_CCW },
 100     { "virtio-mouse-pci", "virtio-mouse", QEMU_ARCH_VIRTIO_PCI },
 101     { "virtio-net-device", "virtio-net", QEMU_ARCH_VIRTIO_MMIO },
 102     { "virtio-net-ccw", "virtio-net", QEMU_ARCH_VIRTIO_CCW },
 103     { "virtio-net-pci", "virtio-net", QEMU_ARCH_VIRTIO_PCI },
 104     { "virtio-rng-device", "virtio-rng", QEMU_ARCH_VIRTIO_MMIO },
 105     { "virtio-rng-ccw", "virtio-rng", QEMU_ARCH_VIRTIO_CCW },
 106     { "virtio-rng-pci", "virtio-rng", QEMU_ARCH_VIRTIO_PCI },
 107     { "virtio-scsi-device", "virtio-scsi", QEMU_ARCH_VIRTIO_MMIO },
 108     { "virtio-scsi-ccw", "virtio-scsi", QEMU_ARCH_VIRTIO_CCW },
 109     { "virtio-scsi-pci", "virtio-scsi", QEMU_ARCH_VIRTIO_PCI },
 110     { "virtio-serial-device", "virtio-serial", QEMU_ARCH_VIRTIO_MMIO },
 111     { "virtio-serial-ccw", "virtio-serial", QEMU_ARCH_VIRTIO_CCW },
 112     { "virtio-serial-pci", "virtio-serial", QEMU_ARCH_VIRTIO_PCI},
 113     { "virtio-sound-device", "virtio-sound", QEMU_ARCH_VIRTIO_MMIO },
 114     { "virtio-sound-pci", "virtio-sound", QEMU_ARCH_VIRTIO_PCI },
 115     { "virtio-tablet-device", "virtio-tablet", QEMU_ARCH_VIRTIO_MMIO },
 116     { "virtio-tablet-ccw", "virtio-tablet", QEMU_ARCH_VIRTIO_CCW },
 117     { "virtio-tablet-pci", "virtio-tablet", QEMU_ARCH_VIRTIO_PCI },
 118     { }
 119 };
 120
 121 static const char *qdev_class_get_alias(DeviceClass *dc)
 122 {
 123     const char *typename = object_class_get_name(OBJECT_CLASS(dc));
 124     int i;
 125
 126     for (i = 0; qdev_alias_table[i].typename; i++) {
 127         if (qdev_alias_table[i].arch_mask &&
 128             !(qdev_alias_table[i].arch_mask & arch_type)) {
 129             continue;
 130         }
 131
 132         if (strcmp(qdev_alias_table[i].typename, typename) == 0) {
 133             return qdev_alias_table[i].alias;
 134         }
 135     }
 136
 137     return NULL;
 138 }
 139
 140 static bool qdev_class_has_alias(DeviceClass *dc)
 141 {
 142     return (qdev_class_get_alias(dc) != NULL);
 143 }
 144
 145 static void qdev_print_devinfo(DeviceClass *dc)
 146 {
 147     qemu_printf("name \"%s\"", object_class_get_name(OBJECT_CLASS(dc)));
 148     if (dc->bus_type) {
 149         qemu_printf(", bus %s", dc->bus_type);
 150     }
 151     if (qdev_class_has_alias(dc)) {
 152         qemu_printf(", alias \"%s\"", qdev_class_get_alias(dc));
 153     }
 154     if (dc->desc) {
 155         qemu_printf(", desc \"%s\"", dc->desc);
 156     }
 157     if (!dc->user_creatable) {
 158         qemu_printf(", no-user");
 159     }
 160     qemu_printf("\n");
 161 }
 162
 163 static void qdev_print_devinfos(bool show_no_user)
 164 {
 165     static const char *cat_name[DEVICE_CATEGORY_MAX + 1] = {
 166         [DEVICE_CATEGORY_BRIDGE]  = "Controller/Bridge/Hub",
 167         [DEVICE_CATEGORY_USB]     = "USB",
 168         [DEVICE_CATEGORY_STORAGE] = "Storage",
 169         [DEVICE_CATEGORY_NETWORK] = "Network",
 170         [DEVICE_CATEGORY_INPUT]   = "Input",
 171         [DEVICE_CATEGORY_DISPLAY] = "Display",
 172         [DEVICE_CATEGORY_SOUND]   = "Sound",
 173         [DEVICE_CATEGORY_MISC]    = "Misc",
 174         [DEVICE_CATEGORY_CPU]     = "CPU",
 175         [DEVICE_CATEGORY_WATCHDOG]= "Watchdog",
 176         [DEVICE_CATEGORY_MAX]     = "Uncategorized",
 177     };
 178     GSList *list, *elt;
 179     int i;
 180     bool cat_printed;
 181
 182     module_load_qom_all();
 183     list = object_class_get_list_sorted(TYPE_DEVICE, false);
 184
 185     for (i = 0; i <= DEVICE_CATEGORY_MAX; i++) {
 186         cat_printed = false;
 187         for (elt = list; elt; elt = elt->next) {
 188             DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, elt->data,
 189                                                  TYPE_DEVICE);
 190             if ((i < DEVICE_CATEGORY_MAX
 191                  ? !test_bit(i, dc->categories)
 192                  : !bitmap_empty(dc->categories, DEVICE_CATEGORY_MAX))
 193                 || (!show_no_user
 194                     && !dc->user_creatable)) {
 195                 continue;
 196             }
 197             if (!cat_printed) {
 198                 qemu_printf("%s%s devices:\n", i ? "\n" : "", cat_name[i]);
 199                 cat_printed = true;
 200             }
 201             qdev_print_devinfo(dc);
 202         }
 203     }
 204
 205     g_slist_free(list);
 206 }
 207
 208 static const char *find_typename_by_alias(const char *alias)
 209 {
 210     int i;
 211
 212     for (i = 0; qdev_alias_table[i].alias; i++) {
 213         if (qdev_alias_table[i].arch_mask &&
 214             !(qdev_alias_table[i].arch_mask & arch_type)) {
 215             continue;
 216         }
 217
 218         if (strcmp(qdev_alias_table[i].alias, alias) == 0) {
 219             return qdev_alias_table[i].typename;
 220         }
 221     }
 222
 223     return NULL;
 224 }
 225
 226 static DeviceClass *qdev_get_device_class(const char **driver, Error **errp)
 227 {
 228     ObjectClass *oc;
 229     DeviceClass *dc;
 230     const char *original_name = *driver;
 231
 232     oc = module_object_class_by_name(*driver);
 233     if (!oc) {
 234         const char *typename = find_typename_by_alias(*driver);
 235
 236         if (typename) {
 237             *driver = typename;
 238             oc = module_object_class_by_name(*driver);
 239         }
 240     }
 241
 242     if (!object_class_dynamic_cast(oc, TYPE_DEVICE)) {
 243         if (*driver != original_name) {
 244             error_setg(errp, "'%s' (alias '%s') is not a valid device model"
 245                        " name", original_name, *driver);
 246         } else {
 247             error_setg(errp, "'%s' is not a valid device model name", *driver);
 248         }
 249         return NULL;
 250     }
 251
 252     if (object_class_is_abstract(oc)) {
 253         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
 254                    "a non-abstract device type");
 255         return NULL;
 256     }
 257
 258     dc = DEVICE_CLASS(oc);
 259     if (!dc->user_creatable ||
 260         (phase_check(PHASE_MACHINE_READY) && !dc->hotpluggable)) {
 261         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
 262                    "a pluggable device type");
 263         return NULL;
 264     }
 265
 266     if (object_class_dynamic_cast(oc, TYPE_SYS_BUS_DEVICE)) {
 267         /* sysbus devices need to be allowed by the machine */
 268         MachineClass *mc = MACHINE_CLASS(object_get_class(qdev_get_machine()));
 269         if (!device_type_is_dynamic_sysbus(mc, *driver)) {
 270             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
 271                        "a dynamic sysbus device type for the machine");
 272             return NULL;
 273         }
 274     }
 275
 276     return dc;
 277 }
 278
 279
 280 int qdev_device_help(QemuOpts *opts)
 281 {
 282     Error *local_err = NULL;
 283     const char *driver;
 284     ObjectPropertyInfoList *prop_list;
 285     ObjectPropertyInfoList *prop;
 286     GPtrArray *array;
 287     int i;
 288
 289     driver = qemu_opt_get(opts, "driver");
 290     if (driver && is_help_option(driver)) {
 291         qdev_print_devinfos(false);
 292         return 1;
 293     }
 294
 295     if (!driver || !qemu_opt_has_help_opt(opts)) {
 296         return 0;
 297     }
 298
 299     if (!object_class_by_name(driver)) {
 300         const char *typename = find_typename_by_alias(driver);
 301
 302         if (typename) {
 303             driver = typename;
 304         }
 305     }
 306
 307     prop_list = qmp_device_list_properties(driver, &local_err);
 308     if (local_err) {
 309         goto error;
 310     }
 311
 312     if (prop_list) {
 313         qemu_printf("%s options:\n", driver);
 314     } else {
 315         qemu_printf("There are no options for %s.\n", driver);
 316     }
 317     array = g_ptr_array_new();
 318     for (prop = prop_list; prop; prop = prop->next) {
 319         g_ptr_array_add(array,
 320                         object_property_help(prop->value->name,
 321                                              prop->value->type,
 322                                              prop->value->default_value,
 323                                              prop->value->description));
 324     }
 325     g_ptr_array_sort(array, (GCompareFunc)qemu_pstrcmp0);
 326     for (i = 0; i < array->len; i++) {
 327         qemu_printf("%s\n", (char *)array->pdata[i]);
 328     }
 329     g_ptr_array_set_free_func(array, g_free);
 330     g_ptr_array_free(array, true);
 331     qapi_free_ObjectPropertyInfoList(prop_list);
 332     return 1;
 333
 334 error:
 335     error_report_err(local_err);
 336     return 1;
 337 }
 338
 339 static Object *qdev_get_peripheral(void)
 340 {
 341     static Object *dev;
 342
 343     if (dev == NULL) {
 344         dev = container_get(qdev_get_machine(), "/peripheral");
 345     }
 346
 347     return dev;
 348 }
 349
 350 static Object *qdev_get_peripheral_anon(void)
 351 {
 352     static Object *dev;
 353
 354     if (dev == NULL) {
 355         dev = container_get(qdev_get_machine(), "/peripheral-anon");
 356     }
 357
 358     return dev;
 359 }
 360
 361 static void qbus_error_append_bus_list_hint(DeviceState *dev,
 362                                             Error *const *errp)
 363 {
 364     BusState *child;
 365     const char *sep = " ";
 366
 367     error_append_hint(errp, "child buses at \"%s\":",
 368                       dev->id ? dev->id : object_get_typename(OBJECT(dev)));
 369     QLIST_FOREACH(child, &dev->child_bus, sibling) {
 370         error_append_hint(errp, "%s\"%s\"", sep, child->name);
 371         sep = ", ";
 372     }
 373     error_append_hint(errp, "\n");
 374 }
 375
 376 static void qbus_error_append_dev_list_hint(BusState *bus,
 377                                             Error *const *errp)
 378 {
 379     BusChild *kid;
 380     const char *sep = " ";
 381
 382     error_append_hint(errp, "devices at \"%s\":", bus->name);
 383     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 384         DeviceState *dev = kid->child;
 385         error_append_hint(errp, "%s\"%s\"", sep,
 386                           object_get_typename(OBJECT(dev)));
 387         if (dev->id) {
 388             error_append_hint(errp, "/\"%s\"", dev->id);
 389         }
 390         sep = ", ";
 391     }
 392     error_append_hint(errp, "\n");
 393 }
 394
 395 static BusState *qbus_find_bus(DeviceState *dev, char *elem)
 396 {
 397     BusState *child;
 398
 399     QLIST_FOREACH(child, &dev->child_bus, sibling) {
 400         if (strcmp(child->name, elem) == 0) {
 401             return child;
 402         }
 403     }
 404     return NULL;
 405 }
 406
 407 static DeviceState *qbus_find_dev(BusState *bus, char *elem)
 408 {
 409     BusChild *kid;
 410
 411     /*
 412      * try to match in order:
 413      *   (1) instance id, if present
 414      *   (2) driver name
 415      *   (3) driver alias, if present
 416      */
 417     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 418         DeviceState *dev = kid->child;
 419         if (dev->id  &&  strcmp(dev->id, elem) == 0) {
 420             return dev;
 421         }
 422     }
 423     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 424         DeviceState *dev = kid->child;
 425         if (strcmp(object_get_typename(OBJECT(dev)), elem) == 0) {
 426             return dev;
 427         }
 428     }
 429     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 430         DeviceState *dev = kid->child;
 431         DeviceClass *dc = DEVICE_GET_CLASS(dev);
 432
 433         if (qdev_class_has_alias(dc) &&
 434             strcmp(qdev_class_get_alias(dc), elem) == 0) {
 435             return dev;
 436         }
 437     }
 438     return NULL;
 439 }
 440
 441 static inline bool qbus_is_full(BusState *bus)
 442 {
 443     BusClass *bus_class;
 444
 445     if (bus->full) {
 446         return true;
 447     }
 448     bus_class = BUS_GET_CLASS(bus);
 449     return bus_class->max_dev && bus->num_children >= bus_class->max_dev;
 450 }
 451
 452 /*
 453  * Search the tree rooted at @bus for a bus.
 454  * If @name, search for a bus with that name.  Note that bus names
 455  * need not be unique.  Yes, that's screwed up.
 456  * Else search for a bus that is a subtype of @bus_typename.
 457  * If more than one exists, prefer one that can take another device.
 458  * Return the bus if found, else %NULL.
 459  */
 460 static BusState *qbus_find_recursive(BusState *bus, const char *name,
 461                                      const char *bus_typename)
 462 {
 463     BusChild *kid;
 464     BusState *pick, *child, *ret;
 465     bool match;
 466
 467     assert(name || bus_typename);
 468     if (name) {
 469         match = !strcmp(bus->name, name);
 470     } else {
 471         match = !!object_dynamic_cast(OBJECT(bus), bus_typename);
 472     }
 473
 474     if (match && !qbus_is_full(bus)) {
 475         return bus;             /* root matches and isn't full */
 476     }
 477
 478     pick = match ? bus : NULL;
 479
 480     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 481         DeviceState *dev = kid->child;
 482         QLIST_FOREACH(child, &dev->child_bus, sibling) {
 483             ret = qbus_find_recursive(child, name, bus_typename);
 484             if (ret && !qbus_is_full(ret)) {
 485                 return ret;     /* a descendant matches and isn't full */
 486             }
 487             if (ret && !pick) {
 488                 pick = ret;
 489             }
 490         }
 491     }
 492
 493     /* root or a descendant matches, but is full */
 494     return pick;
 495 }
 496
 497 static BusState *qbus_find(const char *path, Error **errp)
 498 {
 499     DeviceState *dev;
 500     BusState *bus;
 501     char elem[128];
 502     int pos, len;
 503
 504     /* find start element */
 505     if (path[0] == '/') {
 506         bus = sysbus_get_default();
 507         pos = 0;
 508     } else {
 509         if (sscanf(path, "%127[^/]%n", elem, &len) != 1) {
 510             assert(!path[0]);
 511             elem[0] = len = 0;
 512         }
 513         bus = qbus_find_recursive(sysbus_get_default(), elem, NULL);
 514         if (!bus) {
 515             error_setg(errp, "Bus '%s' not found", elem);
 516             return NULL;
 517         }
 518         pos = len;
 519     }
 520
 521     for (;;) {
 522         assert(path[pos] == '/' || !path[pos]);
 523         while (path[pos] == '/') {
 524             pos++;
 525         }
 526         if (path[pos] == '\0') {
 527             break;
 528         }
 529
 530         /* find device */
 531         if (sscanf(path+pos, "%127[^/]%n", elem, &len) != 1) {
 532             g_assert_not_reached();
 533             elem[0] = len = 0;
 534         }
 535         pos += len;
 536         dev = qbus_find_dev(bus, elem);
 537         if (!dev) {
 538             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 539                       "Device '%s' not found", elem);
 540             qbus_error_append_dev_list_hint(bus, errp);
 541             return NULL;
 542         }
 543
 544         assert(path[pos] == '/' || !path[pos]);
 545         while (path[pos] == '/') {
 546             pos++;
 547         }
 548         if (path[pos] == '\0') {
 549             /* last specified element is a device.  If it has exactly
 550              * one child bus accept it nevertheless */
 551             if (dev->num_child_bus == 1) {
 552                 bus = QLIST_FIRST(&dev->child_bus);
 553                 break;
 554             }
 555             if (dev->num_child_bus) {
 556                 error_setg(errp, "Device '%s' has multiple child buses",
 557                            elem);
 558                 qbus_error_append_bus_list_hint(dev, errp);
 559             } else {
 560                 error_setg(errp, "Device '%s' has no child bus", elem);
 561             }
 562             return NULL;
 563         }
 564
 565         /* find bus */
 566         if (sscanf(path+pos, "%127[^/]%n", elem, &len) != 1) {
 567             g_assert_not_reached();
 568             elem[0] = len = 0;
 569         }
 570         pos += len;
 571         bus = qbus_find_bus(dev, elem);
 572         if (!bus) {
 573             error_setg(errp, "Bus '%s' not found", elem);
 574             qbus_error_append_bus_list_hint(dev, errp);
 575             return NULL;
 576         }
 577     }
 578
 579     if (qbus_is_full(bus)) {
 580         error_setg(errp, "Bus '%s' is full", path);
 581         return NULL;
 582     }
 583     return bus;
 584 }
 585
 586 /* Takes ownership of @id, will be freed when deleting the device */
 587 const char *qdev_set_id(DeviceState *dev, char *id, Error **errp)
 588 {
 589     ObjectProperty *prop;
 590
 591     assert(!dev->id && !dev->realized);
 592
 593     /*
 594      * object_property_[try_]add_child() below will assert the device
 595      * has no parent
 596      */
 597     if (id) {
 598         prop = object_property_try_add_child(qdev_get_peripheral(), id,
 599                                              OBJECT(dev), NULL);
 600         if (prop) {
 601             dev->id = id;
 602         } else {
 603             error_setg(errp, "Duplicate device ID '%s'", id);
 604             g_free(id);
 605             return NULL;
 606         }
 607     } else {
 608         static int anon_count;
 609         gchar *name = g_strdup_printf("device[%d]", anon_count++);
 610         prop = object_property_add_child(qdev_get_peripheral_anon(), name,
 611                                          OBJECT(dev));
 612         g_free(name);
 613     }
 614
 615     return prop->name;
 616 }
 617
 618 DeviceState *qdev_device_add_from_qdict(const QDict *opts,
 619                                         bool from_json, Error **errp)
 620 {
 621     ERRP_GUARD();
 622     DeviceClass *dc;
 623     const char *driver, *path;
 624     char *id;
 625     DeviceState *dev = NULL;
 626     BusState *bus = NULL;
 627
 628     driver = qdict_get_try_str(opts, "driver");
 629     if (!driver) {
 630         error_setg(errp, QERR_MISSING_PARAMETER, "driver");
 631         return NULL;
 632     }
 633
 634     /* find driver */
 635     dc = qdev_get_device_class(&driver, errp);
 636     if (!dc) {
 637         return NULL;
 638     }
 639
 640     /* find bus */
 641     path = qdict_get_try_str(opts, "bus");
 642     if (path != NULL) {
 643         bus = qbus_find(path, errp);
 644         if (!bus) {
 645             return NULL;
 646         }
 647         if (!object_dynamic_cast(OBJECT(bus), dc->bus_type)) {
 648             error_setg(errp, "Device '%s' can't go on %s bus",
 649                        driver, object_get_typename(OBJECT(bus)));
 650             return NULL;
 651         }
 652     } else if (dc->bus_type != NULL) {
 653         bus = qbus_find_recursive(sysbus_get_default(), NULL, dc->bus_type);
 654         if (!bus || qbus_is_full(bus)) {
 655             error_setg(errp, "No '%s' bus found for device '%s'",
 656                        dc->bus_type, driver);
 657             return NULL;
 658         }
 659     }
 660
 661     if (qdev_should_hide_device(opts, from_json, errp)) {
 662         if (bus && !qbus_is_hotpluggable(bus)) {
 663             error_setg(errp, QERR_BUS_NO_HOTPLUG, bus->name);
 664         }
 665         return NULL;
 666     } else if (*errp) {
 667         return NULL;
 668     }
 669
 670     if (phase_check(PHASE_MACHINE_READY) && bus && !qbus_is_hotpluggable(bus)) {
 671         error_setg(errp, QERR_BUS_NO_HOTPLUG, bus->name);
 672         return NULL;
 673     }
 674
 675     if (!migration_is_idle()) {
 676         error_setg(errp, "device_add not allowed while migrating");
 677         return NULL;
 678     }
 679
 680     /* create device */
 681     dev = qdev_new(driver);
 682
 683     /* Check whether the hotplug is allowed by the machine */
 684     if (phase_check(PHASE_MACHINE_READY)) {
 685         if (!qdev_hotplug_allowed(dev, errp)) {
 686             goto err_del_dev;
 687         }
 688
 689         if (!bus && !qdev_get_machine_hotplug_handler(dev)) {
 690             /* No bus, no machine hotplug handler --> device is not hotpluggable */
 691             error_setg(errp, "Device '%s' can not be hotplugged on this machine",
 692                        driver);
 693             goto err_del_dev;
 694         }
 695     }
 696
 697     /*
 698      * set dev's parent and register its id.
 699      * If it fails it means the id is already taken.
 700      */
 701     id = g_strdup(qdict_get_try_str(opts, "id"));
 702     if (!qdev_set_id(dev, id, errp)) {
 703         goto err_del_dev;
 704     }
 705
 706     /* set properties */
 707     dev->opts = qdict_clone_shallow(opts);
 708     qdict_del(dev->opts, "driver");
 709     qdict_del(dev->opts, "bus");
 710     qdict_del(dev->opts, "id");
 711
 712     object_set_properties_from_keyval(&dev->parent_obj, dev->opts, from_json,
 713                                       errp);
 714     if (*errp) {
 715         goto err_del_dev;
 716     }
 717
 718     if (!qdev_realize(dev, bus, errp)) {
 719         goto err_del_dev;
 720     }
 721     return dev;
 722
 723 err_del_dev:
 724     if (dev) {
 725         object_unparent(OBJECT(dev));
 726         object_unref(OBJECT(dev));
 727     }
 728     return NULL;
 729 }
 730
 731 /* Takes ownership of @opts on success */
 732 DeviceState *qdev_device_add(QemuOpts *opts, Error **errp)
 733 {
 734     QDict *qdict = qemu_opts_to_qdict(opts, NULL);
 735     DeviceState *ret;
 736
 737     ret = qdev_device_add_from_qdict(qdict, false, errp);
 738     if (ret) {
 739         qemu_opts_del(opts);
 740     }
 741     qobject_unref(qdict);
 742     return ret;
 743 }
 744
 745 #define qdev_printf(fmt, ...) monitor_printf(mon, "%*s" fmt, indent, "", ## __VA_ARGS__)
 746
 747 static void qdev_print_props(Monitor *mon, DeviceState *dev, Property *props,
 748                              int indent)
 749 {
 750     if (!props)
 751         return;
 752     for (; props->name; props++) {
 753         char *value;
 754         char *legacy_name = g_strdup_printf("legacy-%s", props->name);
 755
 756         if (object_property_get_type(OBJECT(dev), legacy_name, NULL)) {
 757             value = object_property_get_str(OBJECT(dev), legacy_name, NULL);
 758         } else {
 759             value = object_property_print(OBJECT(dev), props->name, true,
 760                                           NULL);
 761         }
 762         g_free(legacy_name);
 763
 764         if (!value) {
 765             continue;
 766         }
 767         qdev_printf("%s = %s\n", props->name,
 768                     *value ? value : "<null>");
 769         g_free(value);
 770     }
 771 }
 772
 773 static void bus_print_dev(BusState *bus, Monitor *mon, DeviceState *dev, int indent)
 774 {
 775     BusClass *bc = BUS_GET_CLASS(bus);
 776
 777     if (bc->print_dev) {
 778         bc->print_dev(mon, dev, indent);
 779     }
 780 }
 781
 782 static void qdev_print(Monitor *mon, DeviceState *dev, int indent)
 783 {
 784     ObjectClass *class;
 785     NamedGPIOList *ngl;
 786     NamedClockList *ncl;
 787
 788     QLIST_FOREACH(ngl, &dev->gpios, node) {
 789         if (ngl->num_in) {
 790             qdev_printf("gpio-in \"%s\" %d\n", ngl->name ? ngl->name : "",
 791                         ngl->num_in);
 792         }
 793         if (ngl->num_out) {
 794             qdev_printf("gpio-out \"%s\" %d\n", ngl->name ? ngl->name : "",
 795                         ngl->num_out);
 796         }
 797     }
 798     QLIST_FOREACH(ncl, &dev->clocks, node) {
 799         g_autofree char *freq_str = clock_display_freq(ncl->clock);
 800         qdev_printf("clock-%s%s \"%s\" freq_hz=%s\n",
 801                     ncl->output ? "out" : "in",
 802                     ncl->alias ? " (alias)" : "",
 803                     ncl->name, freq_str);
 804     }
 805     class = object_get_class(OBJECT(dev));
 806     do {
 807         qdev_print_props(mon, dev, DEVICE_CLASS(class)->props_, indent);
 808         class = object_class_get_parent(class);
 809     } while (class != object_class_by_name(TYPE_DEVICE));
 810     bus_print_dev(dev->parent_bus, mon, dev, indent);
 811 }
 812
 813 static void qbus_print(Monitor *mon, BusState *bus, int indent, bool details)
 814 {
 815     BusChild *kid;
 816
 817     qdev_printf("bus: %s\n", bus->name);
 818     indent += 2;
 819     qdev_printf("type %s\n", object_get_typename(OBJECT(bus)));
 820     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 821         BusState *child_bus;
 822         DeviceState *dev = kid->child;
 823         qdev_printf("dev: %s, id \"%s\"\n", object_get_typename(OBJECT(dev)),
 824                     dev->id ? dev->id : "");
 825         if (details) {
 826             qdev_print(mon, dev, indent + 2);
 827         }
 828         QLIST_FOREACH(child_bus, &dev->child_bus, sibling) {
 829             qbus_print(mon, child_bus, indent + 2, details);
 830         }
 831     }
 832 }
 833 #undef qdev_printf
 834
 835 void hmp_info_qtree(Monitor *mon, const QDict *qdict)
 836 {
 837     bool details = !qdict_get_try_bool(qdict, "brief", false);
 838
 839     if (sysbus_get_default()) {
 840         qbus_print(mon, sysbus_get_default(), 0, details);
 841     }
 842 }
 843
 844 void hmp_info_qdm(Monitor *mon, const QDict *qdict)
 845 {
 846     qdev_print_devinfos(true);
 847 }
 848
 849 void qmp_device_add(QDict *qdict, QObject **ret_data, Error **errp)
 850 {
 851     QemuOpts *opts;
 852     DeviceState *dev;
 853
 854     opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict, errp);
 855     if (!opts) {
 856         return;
 857     }
 858     if (!monitor_cur_is_qmp() && qdev_device_help(opts)) {
 859         qemu_opts_del(opts);
 860         return;
 861     }
 862     dev = qdev_device_add(opts, errp);
 863     if (!dev) {
 864         /*
 865          * Drain all pending RCU callbacks. This is done because
 866          * some bus related operations can delay a device removal
 867          * (in this case this can happen if device is added and then
 868          * removed due to a configuration error)
 869          * to a RCU callback, but user might expect that this interface
 870          * will finish its job completely once qmp command returns result
 871          * to the user
 872          */
 873         drain_call_rcu();
 874
 875         qemu_opts_del(opts);
 876         return;
 877     }
 878     object_unref(OBJECT(dev));
 879 }
 880
 881 static DeviceState *find_device_state(const char *id, Error **errp)
 882 {
 883     Object *obj = object_resolve_path_at(qdev_get_peripheral(), id);
 884     DeviceState *dev;
 885
 886     if (!obj) {
 887         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 888                   "Device '%s' not found", id);
 889         return NULL;
 890     }
 891
 892     dev = (DeviceState *)object_dynamic_cast(obj, TYPE_DEVICE);
 893     if (!dev) {
 894         error_setg(errp, "%s is not a hotpluggable device", id);
 895         return NULL;
 896     }
 897
 898     return dev;
 899 }
 900
 901 void qdev_unplug(DeviceState *dev, Error **errp)
 902 {
 903     DeviceClass *dc = DEVICE_GET_CLASS(dev);
 904     HotplugHandler *hotplug_ctrl;
 905     HotplugHandlerClass *hdc;
 906     Error *local_err = NULL;
 907
 908     if (qdev_unplug_blocked(dev, errp)) {
 909         return;
 910     }
 911
 912     if (dev->parent_bus && !qbus_is_hotpluggable(dev->parent_bus)) {
 913         error_setg(errp, QERR_BUS_NO_HOTPLUG, dev->parent_bus->name);
 914         return;
 915     }
 916
 917     if (!dc->hotpluggable) {
 918         error_setg(errp, QERR_DEVICE_NO_HOTPLUG,
 919                    object_get_typename(OBJECT(dev)));
 920         return;
 921     }
 922
 923     if (!migration_is_idle() && !dev->allow_unplug_during_migration) {
 924         error_setg(errp, "device_del not allowed while migrating");
 925         return;
 926     }
 927
 928     qdev_hot_removed = true;
 929
 930     hotplug_ctrl = qdev_get_hotplug_handler(dev);
 931     /* hotpluggable device MUST have HotplugHandler, if it doesn't
 932      * then something is very wrong with it */
 933     g_assert(hotplug_ctrl);
 934
 935     /* If device supports async unplug just request it to be done,
 936      * otherwise just remove it synchronously */
 937     hdc = HOTPLUG_HANDLER_GET_CLASS(hotplug_ctrl);
 938     if (hdc->unplug_request) {
 939         hotplug_handler_unplug_request(hotplug_ctrl, dev, &local_err);
 940     } else {
 941         hotplug_handler_unplug(hotplug_ctrl, dev, &local_err);
 942         if (!local_err) {
 943             object_unparent(OBJECT(dev));
 944         }
 945     }
 946     error_propagate(errp, local_err);
 947 }
 948
 949 void qmp_device_del(const char *id, Error **errp)
 950 {
 951     DeviceState *dev = find_device_state(id, errp);
 952     if (dev != NULL) {
 953         if (dev->pending_deleted_event &&
 954             (dev->pending_deleted_expires_ms == 0 ||
 955              dev->pending_deleted_expires_ms > qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL))) {
 956             error_setg(errp, "Device %s is already in the "
 957                              "process of unplug", id);
 958             return;
 959         }
 960
 961         qdev_unplug(dev, errp);
 962     }
 963 }
 964
 965 void hmp_device_add(Monitor *mon, const QDict *qdict)
 966 {
 967     Error *err = NULL;
 968
 969     qmp_device_add((QDict *)qdict, NULL, &err);
 970     hmp_handle_error(mon, err);
 971 }
 972
 973 void hmp_device_del(Monitor *mon, const QDict *qdict)
 974 {
 975     const char *id = qdict_get_str(qdict, "id");
 976     Error *err = NULL;
 977
 978     qmp_device_del(id, &err);
 979     hmp_handle_error(mon, err);
 980 }
 981
 982 void device_add_completion(ReadLineState *rs, int nb_args, const char *str)
 983 {
 984     GSList *list, *elt;
 985     size_t len;
 986
 987     if (nb_args != 2) {
 988         return;
 989     }
 990
 991     len = strlen(str);
 992     readline_set_completion_index(rs, len);
 993     list = elt = object_class_get_list(TYPE_DEVICE, false);
 994     while (elt) {
 995         DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, elt->data,
 996                                              TYPE_DEVICE);
 997
 998         if (dc->user_creatable) {
 999             readline_add_completion_of(rs, str,
1000                                 object_class_get_name(OBJECT_CLASS(dc)));
1001         }
1002         elt = elt->next;
1003     }
1004     g_slist_free(list);
1005 }
1006
1007 static int qdev_add_hotpluggable_device(Object *obj, void *opaque)
1008 {
1009     GSList **list = opaque;
1010     DeviceState *dev = (DeviceState *)object_dynamic_cast(obj, TYPE_DEVICE);
1011
1012     if (dev == NULL) {
1013         return 0;
1014     }
1015
1016     if (dev->realized && object_property_get_bool(obj, "hotpluggable", NULL)) {
1017         *list = g_slist_append(*list, dev);
1018     }
1019
1020     return 0;
1021 }
1022
1023 static GSList *qdev_build_hotpluggable_device_list(Object *peripheral)
1024 {
1025     GSList *list = NULL;
1026
1027     object_child_foreach(peripheral, qdev_add_hotpluggable_device, &list);
1028
1029     return list;
1030 }
1031
1032 static void peripheral_device_del_completion(ReadLineState *rs,
1033                                              const char *str)
1034 {
1035     Object *peripheral = container_get(qdev_get_machine(), "/peripheral");
1036     GSList *list, *item;
1037
1038     list = qdev_build_hotpluggable_device_list(peripheral);
1039     if (!list) {
1040         return;
1041     }
1042
1043     for (item = list; item; item = g_slist_next(item)) {
1044         DeviceState *dev = item->data;
1045
1046         if (dev->id) {
1047             readline_add_completion_of(rs, str, dev->id);
1048         }
1049     }
1050
1051     g_slist_free(list);
1052 }
1053
1054 void device_del_completion(ReadLineState *rs, int nb_args, const char *str)
1055 {
1056     if (nb_args != 2) {
1057         return;
1058     }
1059
1060     readline_set_completion_index(rs, strlen(str));
1061     peripheral_device_del_completion(rs, str);
1062 }
1063
1064 BlockBackend *blk_by_qdev_id(const char *id, Error **errp)
1065 {
1066     DeviceState *dev;
1067     BlockBackend *blk;
1068
1069     GLOBAL_STATE_CODE();
1070
1071     dev = find_device_state(id, errp);
1072     if (dev == NULL) {
1073         return NULL;
1074     }
1075
1076     blk = blk_by_dev(dev);
1077     if (!blk) {
1078         error_setg(errp, "Device does not have a block device backend");
1079     }
1080     return blk;
1081 }
1082
1083 QemuOptsList qemu_device_opts = {
1084     .name = "device",
1085     .implied_opt_name = "driver",
1086     .head = QTAILQ_HEAD_INITIALIZER(qemu_device_opts.head),
1087     .desc = {
1088         /*
1089          * no elements => accept any
1090          * sanity checking will happen later
1091          * when setting device properties
1092          */
1093         { /* end of list */ }
1094     },
1095 };
1096
1097 QemuOptsList qemu_global_opts = {
1098     .name = "global",
1099     .head = QTAILQ_HEAD_INITIALIZER(qemu_global_opts.head),
1100     .desc = {
1101         {
1102             .name = "driver",
1103             .type = QEMU_OPT_STRING,
1104         },{
1105             .name = "property",
1106             .type = QEMU_OPT_STRING,
1107         },{
1108             .name = "value",
1109             .type = QEMU_OPT_STRING,
1110         },
1111         { /* end of list */ }
1112     },
1113 };
1114
1115 int qemu_global_option(const char *str)
1116 {
1117     char driver[64], property[64];
1118     QemuOpts *opts;
1119     int rc, offset;
1120
1121     rc = sscanf(str, "%63[^.=].%63[^=]%n", driver, property, &offset);
1122     if (rc == 2 && str[offset] == '=') {
1123         opts = qemu_opts_create(&qemu_global_opts, NULL, 0, &error_abort);
1124         qemu_opt_set(opts, "driver", driver, &error_abort);
1125         qemu_opt_set(opts, "property", property, &error_abort);
1126         qemu_opt_set(opts, "value", str + offset + 1, &error_abort);
1127         return 0;
1128     }
1129
1130     opts = qemu_opts_parse_noisily(&qemu_global_opts, str, false);
1131     if (!opts) {
1132         return -1;
1133     }
1134     if (!qemu_opt_get(opts, "driver")
1135         || !qemu_opt_get(opts, "property")
1136         || !qemu_opt_get(opts, "value")) {
1137         error_report("options 'driver', 'property', and 'value'"
1138                      " are required");
1139         return -1;
1140     }
1141
1142     return 0;
1143 }
1144
1145 bool qmp_command_available(const QmpCommand *cmd, Error **errp)
1146 {
1147     if (!phase_check(PHASE_MACHINE_READY) &&
1148         !(cmd->options & QCO_ALLOW_PRECONFIG)) {
1149         error_setg(errp, "The command '%s' is permitted only after machine initialization has completed",
1150                    cmd->name);
1151         return false;
1152     }
1153     return true;
1154 }