aboutsummaryrefslogtreecommitdiff
path: root/hw/qdev.c
blob: 8dd995f1a1b9b607e5c97db75b1648a2aad663b9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
/*
 *  Dynamic device configuration and creation.
 *
 *  Copyright (c) 2009 CodeSourcery
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */

/* The theory here is that it should be possible to create a machine without
   knowledge of specific devices.  Historically board init routines have
   passed a bunch of arguments to each device, requiring the board know
   exactly which device it is dealing with.  This file provides an abstract
   API for device configuration and initialization.  Devices will generally
   inherit from a particular bus (e.g. PCI or I2C) rather than
   this API directly.  */

#include "net.h"
#include "qdev.h"
#include "sysemu.h"
#include "monitor.h"
#include "qerror.h"

static int qdev_hotplug = 0;

/* This is a nasty hack to allow passing a NULL bus to qdev_create.  */
static BusState *main_system_bus;

DeviceInfo *device_info_list;

static BusState *qbus_find_recursive(BusState *bus, const char *name,
                                     const BusInfo *info);
static BusState *qbus_find(const char *path);

/* Register a new device type.  */
void qdev_register(DeviceInfo *info)
{
    assert(info->size >= sizeof(DeviceState));
    assert(!info->next);

    info->next = device_info_list;
    device_info_list = info;
}

static DeviceInfo *qdev_find_info(BusInfo *bus_info, const char *name)
{
    DeviceInfo *info;

    /* first check device names */
    for (info = device_info_list; info != NULL; info = info->next) {
        if (bus_info && info->bus_info != bus_info)
            continue;
        if (strcmp(info->name, name) != 0)
            continue;
        return info;
    }

    /* failing that check the aliases */
    for (info = device_info_list; info != NULL; info = info->next) {
        if (bus_info && info->bus_info != bus_info)
            continue;
        if (!info->alias)
            continue;
        if (strcmp(info->alias, name) != 0)
            continue;
        return info;
    }
    return NULL;
}

/* Create a new device.  This only initializes the device state structure
   and allows properties to be set.  qdev_init should be called to
   initialize the actual device emulation.  */
DeviceState *qdev_create(BusState *bus, const char *name)
{
    DeviceInfo *info;
    DeviceState *dev;

    if (!bus) {
        if (!main_system_bus) {
            main_system_bus = qbus_create(&system_bus_info, NULL, "main-system-bus");
        }
        bus = main_system_bus;
    }

    info = qdev_find_info(bus->info, name);
    if (!info) {
        hw_error("Unknown device '%s' for bus '%s'\n", name, bus->info->name);
    }

    dev = qemu_mallocz(info->size);
    dev->info = info;
    dev->parent_bus = bus;
    qdev_prop_set_defaults(dev, dev->info->props);
    qdev_prop_set_defaults(dev, dev->parent_bus->info->props);
    qdev_prop_set_globals(dev);
    QLIST_INSERT_HEAD(&bus->children, dev, sibling);
    if (qdev_hotplug) {
        assert(bus->allow_hotplug);
        dev->hotplugged = 1;
    }
    dev->state = DEV_STATE_CREATED;
    return dev;
}

static void qdev_print_devinfo(DeviceInfo *info)
{
    error_printf("name \"%s\", bus %s",
                 info->name, info->bus_info->name);
    if (info->alias) {
        error_printf(", alias \"%s\"", info->alias);
    }
    if (info->desc) {
        error_printf(", desc \"%s\"", info->desc);
    }
    if (info->no_user) {
        error_printf(", no-user");
    }
    error_printf("\n");
}

static int set_property(const char *name, const char *value, void *opaque)
{
    DeviceState *dev = opaque;

    if (strcmp(name, "driver") == 0)
        return 0;
    if (strcmp(name, "bus") == 0)
        return 0;

    if (qdev_prop_parse(dev, name, value) == -1) {
        qemu_error("can't set property \"%s\" to \"%s\" for \"%s\"\n",
                   name, value, dev->info->name);
        return -1;
    }
    return 0;
}

int qdev_device_help(QemuOpts *opts)
{
    const char *driver;
    DeviceInfo *info;
    Property *prop;

    driver = qemu_opt_get(opts, "driver");
    if (driver && !strcmp(driver, "?")) {
        for (info = device_info_list; info != NULL; info = info->next) {
            qdev_print_devinfo(info);
        }
        return 1;
    }

    if (!qemu_opt_get(opts, "?")) {
        return 0;
    }

    info = qdev_find_info(NULL, driver);
    if (!info) {
        return 0;
    }

    for (prop = info->props; prop && prop->name; prop++) {
        error_printf("%s.%s=%s\n", info->name, prop->name, prop->info->name);
    }
    return 1;
}

DeviceState *qdev_device_add(QemuOpts *opts)
{
    const char *driver, *path, *id;
    DeviceInfo *info;
    DeviceState *qdev;
    BusState *bus;

    driver = qemu_opt_get(opts, "driver");
    if (!driver) {
        qemu_error("-device: no driver specified\n");
        return NULL;
    }

    /* find driver */
    info = qdev_find_info(NULL, driver);
    if (!info) {
        qemu_error_new(QERR_DEVICE_NOT_FOUND, driver);
        return NULL;
    }
    if (info->no_user) {
        qemu_error("device \"%s\" can't be added via command line\n",
                   info->name);
        return NULL;
    }

    /* find bus */
    path = qemu_opt_get(opts, "bus");
    if (path != NULL) {
        bus = qbus_find(path);
    } else {
        bus = qbus_find_recursive(main_system_bus, NULL, info->bus_info);
    }
    if (!bus) {
        qemu_error("Did not find %s bus for %s\n",
                   path ? path : info->bus_info->name, info->name);
        return NULL;
    }
    if (qdev_hotplug && !bus->allow_hotplug) {
        qemu_error("Bus %s does not support hotplugging\n",
                   bus->name);
        return NULL;
    }

    /* create device, set properties */
    qdev = qdev_create(bus, driver);
    id = qemu_opts_id(opts);
    if (id) {
        qdev->id = id;
    }
    if (qemu_opt_foreach(opts, set_property, qdev, 1) != 0) {
        qdev_free(qdev);
        return NULL;
    }
    if (qdev_init(qdev) < 0) {
        qemu_error("Error initializing device %s\n", driver);
        return NULL;
    }
    qdev->opts = opts;
    return qdev;
}

static void qdev_reset(void *opaque)
{
    DeviceState *dev = opaque;
    if (dev->info->reset)
        dev->info->reset(dev);
}

/* Initialize a device.  Device properties should be set before calling
   this function.  IRQs and MMIO regions should be connected/mapped after
   calling this function.
   On failure, destroy the device and return negative value.
   Return 0 on success.  */
int qdev_init(DeviceState *dev)
{
    int rc;

    assert(dev->state == DEV_STATE_CREATED);
    rc = dev->info->init(dev, dev->info);
    if (rc < 0) {
        qdev_free(dev);
        return rc;
    }
    qemu_register_reset(qdev_reset, dev);
    if (dev->info->vmsd)
        vmstate_register(-1, dev->info->vmsd, dev);
    dev->state = DEV_STATE_INITIALIZED;
    return 0;
}

int qdev_unplug(DeviceState *dev)
{
    if (!dev->parent_bus->allow_hotplug) {
        qemu_error("Bus %s does not support hotplugging\n",
                   dev->parent_bus->name);
        return -1;
    }
    assert(dev->info->unplug != NULL);

    return dev->info->unplug(dev);
}

/* can be used as ->unplug() callback for the simple cases */
int qdev_simple_unplug_cb(DeviceState *dev)
{
    /* just zap it */
    qdev_free(dev);
    return 0;
}

/* Like qdev_init(), but terminate program via hw_error() instead of
   returning an error value.  This is okay during machine creation.
   Don't use for hotplug, because there callers need to recover from
   failure.  Exception: if you know the device's init() callback can't
   fail, then qdev_init_nofail() can't fail either, and is therefore
   usable even then.  But relying on the device implementation that
   way is somewhat unclean, and best avoided.  */
void qdev_init_nofail(DeviceState *dev)
{
    DeviceInfo *info = dev->info;

    if (qdev_init(dev) < 0)
        hw_error("Initialization of device %s failed\n", info->name);
}

/* Unlink device from bus and free the structure.  */
void qdev_free(DeviceState *dev)
{
    BusState *bus;

    if (dev->state == DEV_STATE_INITIALIZED) {
        while (dev->num_child_bus) {
            bus = QLIST_FIRST(&dev->child_bus);
            qbus_free(bus);
        }
        if (dev->info->vmsd)
            vmstate_unregister(dev->info->vmsd, dev);
        if (dev->info->exit)
            dev->info->exit(dev);
        if (dev->opts)
            qemu_opts_del(dev->opts);
    }
    qemu_unregister_reset(qdev_reset, dev);
    QLIST_REMOVE(dev, sibling);
    qemu_free(dev);
}

void qdev_machine_creation_done(void)
{
    /*
     * ok, initial machine setup is done, starting from now we can
     * only create hotpluggable devices
     */
    qdev_hotplug = 1;
}

/* Get a character (serial) device interface.  */
CharDriverState *qdev_init_chardev(DeviceState *dev)
{
    static int next_serial;

    /* FIXME: This function needs to go away: use chardev properties!  */
    return serial_hds[next_serial++];
}

BusState *qdev_get_parent_bus(DeviceState *dev)
{
    return dev->parent_bus;
}

void qdev_init_gpio_in(DeviceState *dev, qemu_irq_handler handler, int n)
{
    assert(dev->num_gpio_in == 0);
    dev->num_gpio_in = n;
    dev->gpio_in = qemu_allocate_irqs(handler, dev, n);
}

void qdev_init_gpio_out(DeviceState *dev, qemu_irq *pins, int n)
{
    assert(dev->num_gpio_out == 0);
    dev->num_gpio_out = n;
    dev->gpio_out = pins;
}

qemu_irq qdev_get_gpio_in(DeviceState *dev, int n)
{
    assert(n >= 0 && n < dev->num_gpio_in);
    return dev->gpio_in[n];
}

void qdev_connect_gpio_out(DeviceState * dev, int n, qemu_irq pin)
{
    assert(n >= 0 && n < dev->num_gpio_out);
    dev->gpio_out[n] = pin;
}

void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd)
{
    qdev_prop_set_macaddr(dev, "mac", nd->macaddr);
    if (nd->vlan)
        qdev_prop_set_vlan(dev, "vlan", nd->vlan);
    if (nd->netdev)
        qdev_prop_set_netdev(dev, "netdev", nd->netdev);
    if (nd->nvectors != DEV_NVECTORS_UNSPECIFIED &&
        qdev_prop_exists(dev, "vectors")) {
        qdev_prop_set_uint32(dev, "vectors", nd->nvectors);
    }
}

static int next_block_unit[IF_COUNT];

/* Get a block device.  This should only be used for single-drive devices
   (e.g. SD/Floppy/MTD).  Multi-disk devices (scsi/ide) should use the
   appropriate bus.  */
BlockDriverState *qdev_init_bdrv(DeviceState *dev, BlockInterfaceType type)
{
    int unit = next_block_unit[type]++;
    DriveInfo *dinfo;

    dinfo = drive_get(type, 0, unit);
    return dinfo ? dinfo->bdrv : NULL;
}

BusState *qdev_get_child_bus(DeviceState *dev, const char *name)
{
    BusState *bus;

    QLIST_FOREACH(bus, &dev->child_bus, sibling) {
        if (strcmp(name, bus->name) == 0) {
            return bus;
        }
    }
    return NULL;
}

static BusState *qbus_find_recursive(BusState *bus, const char *name,
                                     const BusInfo *info)
{
    DeviceState *dev;
    BusState *child, *ret;
    int match = 1;

    if (name && (strcmp(bus->name, name) != 0)) {
        match = 0;
    }
    if (info && (bus->info != info)) {
        match = 0;
    }
    if (match) {
        return bus;
    }

    QLIST_FOREACH(dev, &bus->children, sibling) {
        QLIST_FOREACH(child, &dev->child_bus, sibling) {
            ret = qbus_find_recursive(child, name, info);
            if (ret) {
                return ret;
            }
        }
    }
    return NULL;
}

static DeviceState *qdev_find_recursive(BusState *bus, const char *id)
{
    DeviceState *dev, *ret;
    BusState *child;

    QLIST_FOREACH(dev, &bus->children, sibling) {
        if (dev->id && strcmp(dev->id, id) == 0)
            return dev;
        QLIST_FOREACH(child, &dev->child_bus, sibling) {
            ret = qdev_find_recursive(child, id);
            if (ret) {
                return ret;
            }
        }
    }
    return NULL;
}

static void qbus_list_bus(DeviceState *dev)
{
    BusState *child;
    const char *sep = " ";

    error_printf("child busses at \"%s\":",
                 dev->id ? dev->id : dev->info->name);
    QLIST_FOREACH(child, &dev->child_bus, sibling) {
        error_printf("%s\"%s\"", sep, child->name);
        sep = ", ";
    }
    error_printf("\n");
}

static void qbus_list_dev(BusState *bus)
{
    DeviceState *dev;
    const char *sep = " ";

    error_printf("devices at \"%s\":", bus->name);
    QLIST_FOREACH(dev, &bus->children, sibling) {
        error_printf("%s\"%s\"", sep, dev->info->name);
        if (dev->id)
            error_printf("/\"%s\"", dev->id);
        sep = ", ";
    }
    error_printf("\n");
}

static BusState *qbus_find_bus(DeviceState *dev, char *elem)
{
    BusState *child;

    QLIST_FOREACH(child, &dev->child_bus, sibling) {
        if (strcmp(child->name, elem) == 0) {
            return child;
        }
    }
    return NULL;
}

static DeviceState *qbus_find_dev(BusState *bus, char *elem)
{
    DeviceState *dev;

    /*
     * try to match in order:
     *   (1) instance id, if present
     *   (2) driver name
     *   (3) driver alias, if present
     */
    QLIST_FOREACH(dev, &bus->children, sibling) {
        if (dev->id  &&  strcmp(dev->id, elem) == 0) {
            return dev;
        }
    }
    QLIST_FOREACH(dev, &bus->children, sibling) {
        if (strcmp(dev->info->name, elem) == 0) {
            return dev;
        }
    }
    QLIST_FOREACH(dev, &bus->children, sibling) {
        if (dev->info->alias && strcmp(dev->info->alias, elem) == 0) {
            return dev;
        }
    }
    return NULL;
}

static BusState *qbus_find(const char *path)
{
    DeviceState *dev;
    BusState *bus;
    char elem[128];
    int pos, len;

    /* find start element */
    if (path[0] == '/') {
        bus = main_system_bus;
        pos = 0;
    } else {
        if (sscanf(path, "%127[^/]%n", elem, &len) != 1) {
            qemu_error("path parse error (\"%s\")\n", path);
            return NULL;
        }
        bus = qbus_find_recursive(main_system_bus, elem, NULL);
        if (!bus) {
            qemu_error("bus \"%s\" not found\n", elem);
            return NULL;
        }
        pos = len;
    }

    for (;;) {
        if (path[pos] == '\0') {
            /* we are done */
            return bus;
        }

        /* find device */
        if (sscanf(path+pos, "/%127[^/]%n", elem, &len) != 1) {
            qemu_error("path parse error (\"%s\" pos %d)\n", path, pos);
            return NULL;
        }
        pos += len;
        dev = qbus_find_dev(bus, elem);
        if (!dev) {
            qemu_error("device \"%s\" not found\n", elem);
            qbus_list_dev(bus);
            return NULL;
        }
        if (path[pos] == '\0') {
            /* last specified element is a device.  If it has exactly
             * one child bus accept it nevertheless */
            switch (dev->num_child_bus) {
            case 0:
                qemu_error("device has no child bus (%s)\n", path);
                return NULL;
            case 1:
                return QLIST_FIRST(&dev->child_bus);
            default:
                qemu_error("device has multiple child busses (%s)\n", path);
                qbus_list_bus(dev);
                return NULL;
            }
        }

        /* find bus */
        if (sscanf(path+pos, "/%127[^/]%n", elem, &len) != 1) {
            qemu_error("path parse error (\"%s\" pos %d)\n", path, pos);
            return NULL;
        }
        pos += len;
        bus = qbus_find_bus(dev, elem);
        if (!bus) {
            qemu_error("child bus \"%s\" not found\n", elem);
            qbus_list_bus(dev);
            return NULL;
        }
    }
}

void qbus_create_inplace(BusState *bus, BusInfo *info,
                         DeviceState *parent, const char *name)
{
    char *buf;
    int i,len;

    bus->info = info;
    bus->parent = parent;

    if (name) {
        /* use supplied name */
        bus->name = qemu_strdup(name);
    } else if (parent && parent->id) {
        /* parent device has id -> use it for bus name */
        len = strlen(parent->id) + 16;
        buf = qemu_malloc(len);
        snprintf(buf, len, "%s.%d", parent->id, parent->num_child_bus);
        bus->name = buf;
    } else {
        /* no id -> use lowercase bus type for bus name */
        len = strlen(info->name) + 16;
        buf = qemu_malloc(len);
        len = snprintf(buf, len, "%s.%d", info->name,
                       parent ? parent->num_child_bus : 0);
        for (i = 0; i < len; i++)
            buf[i] = qemu_tolower(buf[i]);
        bus->name = buf;
    }

    QLIST_INIT(&bus->children);
    if (parent) {
        QLIST_INSERT_HEAD(&parent->child_bus, bus, sibling);
        parent->num_child_bus++;
    }

}

BusState *qbus_create(BusInfo *info, DeviceState *parent, const char *name)
{
    BusState *bus;

    bus = qemu_mallocz(info->size);
    bus->qdev_allocated = 1;
    qbus_create_inplace(bus, info, parent, name);
    return bus;
}

void qbus_free(BusState *bus)
{
    DeviceState *dev;

    while ((dev = QLIST_FIRST(&bus->children)) != NULL) {
        qdev_free(dev);
    }
    if (bus->parent) {
        QLIST_REMOVE(bus, sibling);
        bus->parent->num_child_bus--;
    }
    if (bus->qdev_allocated) {
        qemu_free(bus);
    }
}

#define qdev_printf(fmt, ...) monitor_printf(mon, "%*s" fmt, indent, "", ## __VA_ARGS__)
static void qbus_print(Monitor *mon, BusState *bus, int indent);

static void qdev_print_props(Monitor *mon, DeviceState *dev, Property *props,
                             const char *prefix, int indent)
{
    char buf[64];

    if (!props)
        return;
    while (props->name) {
        if (props->info->print) {
            props->info->print(dev, props, buf, sizeof(buf));
            qdev_printf("%s-prop: %s = %s\n", prefix, props->name, buf);
        }
        props++;
    }
}

static void qdev_print(Monitor *mon, DeviceState *dev, int indent)
{
    BusState *child;
    qdev_printf("dev: %s, id \"%s\"\n", dev->info->name,
                dev->id ? dev->id : "");
    indent += 2;
    if (dev->num_gpio_in) {
        qdev_printf("gpio-in %d\n", dev->num_gpio_in);
    }
    if (dev->num_gpio_out) {
        qdev_printf("gpio-out %d\n", dev->num_gpio_out);
    }
    qdev_print_props(mon, dev, dev->info->props, "dev", indent);
    qdev_print_props(mon, dev, dev->parent_bus->info->props, "bus", indent);
    if (dev->parent_bus->info->print_dev)
        dev->parent_bus->info->print_dev(mon, dev, indent);
    QLIST_FOREACH(child, &dev->child_bus, sibling) {
        qbus_print(mon, child, indent);
    }
}

static void qbus_print(Monitor *mon, BusState *bus, int indent)
{
    struct DeviceState *dev;

    qdev_printf("bus: %s\n", bus->name);
    indent += 2;
    qdev_printf("type %s\n", bus->info->name);
    QLIST_FOREACH(dev, &bus->children, sibling) {
        qdev_print(mon, dev, indent);
    }
}
#undef qdev_printf

void do_info_qtree(Monitor *mon)
{
    if (main_system_bus)
        qbus_print(mon, main_system_bus, 0);
}

void do_info_qdm(Monitor *mon)
{
    DeviceInfo *info;

    for (info = device_info_list; info != NULL; info = info->next) {
        qdev_print_devinfo(info);
    }
}

void do_device_add(Monitor *mon, const QDict *qdict)
{
    QemuOpts *opts;

    opts = qemu_opts_parse(&qemu_device_opts,
                           qdict_get_str(qdict, "config"), "driver");
    if (opts) {
        if (qdev_device_help(opts) || qdev_device_add(opts) == NULL) {
            qemu_opts_del(opts);
        }
    }
}

void do_device_del(Monitor *mon, const QDict *qdict)
{
    const char *id = qdict_get_str(qdict, "id");
    DeviceState *dev;

    dev = qdev_find_recursive(main_system_bus, id);
    if (NULL == dev) {
        qemu_error("Device '%s' not found\n", id);
        return;
    }
    qdev_unplug(dev);
}