2 * Copyright (c) 2018 Citrix Systems Inc.
4 * This work is licensed under the terms of the GNU GPL, version 2 or later.
5 * See the COPYING file in the top-level directory.
8 #include "qemu/osdep.h"
9 #include "qemu/cutils.h"
10 #include "qemu/option.h"
11 #include "qapi/error.h"
12 #include "qapi/qapi-commands-block-core.h"
13 #include "qapi/qapi-commands-misc.h"
14 #include "qapi/qapi-visit-block-core.h"
15 #include "qapi/qobject-input-visitor.h"
16 #include "qapi/visitor.h"
17 #include "qapi/qmp/qdict.h"
18 #include "qapi/qmp/qstring.h"
20 #include "hw/xen/xen_common.h"
21 #include "hw/block/xen_blkif.h"
22 #include "hw/xen/xen-block.h"
23 #include "hw/xen/xen-backend.h"
24 #include "sysemu/blockdev.h"
25 #include "sysemu/block-backend.h"
26 #include "sysemu/iothread.h"
27 #include "dataplane/xen-block.h"
30 static char *xen_block_get_name(XenDevice
*xendev
, Error
**errp
)
32 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
33 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
35 return g_strdup_printf("%lu", vdev
->number
);
38 static void xen_block_disconnect(XenDevice
*xendev
, Error
**errp
)
40 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
41 const char *type
= object_get_typename(OBJECT(blockdev
));
42 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
44 trace_xen_block_disconnect(type
, vdev
->disk
, vdev
->partition
);
46 xen_block_dataplane_stop(blockdev
->dataplane
);
49 static void xen_block_connect(XenDevice
*xendev
, Error
**errp
)
51 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
52 const char *type
= object_get_typename(OBJECT(blockdev
));
53 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
54 unsigned int order
, nr_ring_ref
, *ring_ref
, event_channel
, protocol
;
57 trace_xen_block_connect(type
, vdev
->disk
, vdev
->partition
);
59 if (xen_device_frontend_scanf(xendev
, "ring-page-order", "%u",
62 ring_ref
= g_new(unsigned int, nr_ring_ref
);
64 if (xen_device_frontend_scanf(xendev
, "ring-ref", "%u",
66 error_setg(errp
, "failed to read ring-ref");
70 } else if (order
<= blockdev
->props
.max_ring_page_order
) {
73 nr_ring_ref
= 1 << order
;
74 ring_ref
= g_new(unsigned int, nr_ring_ref
);
76 for (i
= 0; i
< nr_ring_ref
; i
++) {
77 const char *key
= g_strdup_printf("ring-ref%u", i
);
79 if (xen_device_frontend_scanf(xendev
, key
, "%u",
81 error_setg(errp
, "failed to read %s", key
);
82 g_free((gpointer
)key
);
87 g_free((gpointer
)key
);
90 error_setg(errp
, "invalid ring-page-order (%d)", order
);
94 if (xen_device_frontend_scanf(xendev
, "event-channel", "%u",
95 &event_channel
) != 1) {
96 error_setg(errp
, "failed to read event-channel");
101 if (xen_device_frontend_scanf(xendev
, "protocol", "%ms",
103 protocol
= BLKIF_PROTOCOL_NATIVE
;
105 if (strcmp(str
, XEN_IO_PROTO_ABI_X86_32
) == 0) {
106 protocol
= BLKIF_PROTOCOL_X86_32
;
107 } else if (strcmp(str
, XEN_IO_PROTO_ABI_X86_64
) == 0) {
108 protocol
= BLKIF_PROTOCOL_X86_64
;
110 protocol
= BLKIF_PROTOCOL_NATIVE
;
116 xen_block_dataplane_start(blockdev
->dataplane
, ring_ref
, nr_ring_ref
,
117 event_channel
, protocol
, errp
);
122 static void xen_block_unrealize(XenDevice
*xendev
, Error
**errp
)
124 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
125 XenBlockDeviceClass
*blockdev_class
=
126 XEN_BLOCK_DEVICE_GET_CLASS(xendev
);
127 const char *type
= object_get_typename(OBJECT(blockdev
));
128 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
130 if (vdev
->type
== XEN_BLOCK_VDEV_TYPE_INVALID
) {
134 trace_xen_block_unrealize(type
, vdev
->disk
, vdev
->partition
);
136 /* Disconnect from the frontend in case this has not already happened */
137 xen_block_disconnect(xendev
, NULL
);
139 xen_block_dataplane_destroy(blockdev
->dataplane
);
140 blockdev
->dataplane
= NULL
;
142 if (blockdev_class
->unrealize
) {
143 blockdev_class
->unrealize(blockdev
, errp
);
147 static void xen_block_set_size(XenBlockDevice
*blockdev
)
149 const char *type
= object_get_typename(OBJECT(blockdev
));
150 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
151 BlockConf
*conf
= &blockdev
->props
.conf
;
152 int64_t sectors
= blk_getlength(conf
->blk
) / conf
->logical_block_size
;
153 XenDevice
*xendev
= XEN_DEVICE(blockdev
);
155 trace_xen_block_size(type
, vdev
->disk
, vdev
->partition
, sectors
);
157 xen_device_backend_printf(xendev
, "sectors", "%"PRIi64
, sectors
);
160 static void xen_block_resize_cb(void *opaque
)
162 XenBlockDevice
*blockdev
= opaque
;
163 XenDevice
*xendev
= XEN_DEVICE(blockdev
);
164 enum xenbus_state state
= xen_device_backend_get_state(xendev
);
166 xen_block_set_size(blockdev
);
169 * Mimic the behaviour of Linux xen-blkback and re-write the state
170 * to trigger the frontend watch.
172 xen_device_backend_printf(xendev
, "state", "%u", state
);
175 static const BlockDevOps xen_block_dev_ops
= {
176 .resize_cb
= xen_block_resize_cb
,
179 static void xen_block_realize(XenDevice
*xendev
, Error
**errp
)
181 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
182 XenBlockDeviceClass
*blockdev_class
=
183 XEN_BLOCK_DEVICE_GET_CLASS(xendev
);
184 const char *type
= object_get_typename(OBJECT(blockdev
));
185 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
186 BlockConf
*conf
= &blockdev
->props
.conf
;
187 Error
*local_err
= NULL
;
189 if (vdev
->type
== XEN_BLOCK_VDEV_TYPE_INVALID
) {
190 error_setg(errp
, "vdev property not set");
194 trace_xen_block_realize(type
, vdev
->disk
, vdev
->partition
);
196 if (blockdev_class
->realize
) {
197 blockdev_class
->realize(blockdev
, &local_err
);
199 error_propagate(errp
, local_err
);
205 * The blkif protocol does not deal with removable media, so it must
206 * always be present, even for CDRom devices.
209 if (!blk_is_inserted(conf
->blk
)) {
210 error_setg(errp
, "device needs media, but drive is empty");
214 if (!blkconf_apply_backend_options(conf
, blockdev
->info
& VDISK_READONLY
,
219 if (!(blockdev
->info
& VDISK_CDROM
) &&
220 !blkconf_geometry(conf
, NULL
, 65535, 255, 255, errp
)) {
224 blkconf_blocksizes(conf
);
226 if (conf
->logical_block_size
> conf
->physical_block_size
) {
228 errp
, "logical_block_size > physical_block_size not supported");
232 blk_set_dev_ops(conf
->blk
, &xen_block_dev_ops
, blockdev
);
233 blk_set_guest_block_size(conf
->blk
, conf
->logical_block_size
);
235 if (conf
->discard_granularity
> 0) {
236 xen_device_backend_printf(xendev
, "feature-discard", "%u", 1);
239 xen_device_backend_printf(xendev
, "feature-flush-cache", "%u", 1);
240 xen_device_backend_printf(xendev
, "max-ring-page-order", "%u",
241 blockdev
->props
.max_ring_page_order
);
242 xen_device_backend_printf(xendev
, "info", "%u", blockdev
->info
);
244 xen_device_frontend_printf(xendev
, "virtual-device", "%lu",
246 xen_device_frontend_printf(xendev
, "device-type", "%s",
247 blockdev
->device_type
);
249 xen_device_backend_printf(xendev
, "sector-size", "%u",
250 conf
->logical_block_size
);
252 xen_block_set_size(blockdev
);
254 blockdev
->dataplane
=
255 xen_block_dataplane_create(xendev
, conf
, blockdev
->props
.iothread
);
258 static void xen_block_frontend_changed(XenDevice
*xendev
,
259 enum xenbus_state frontend_state
,
262 enum xenbus_state backend_state
= xen_device_backend_get_state(xendev
);
263 Error
*local_err
= NULL
;
265 switch (frontend_state
) {
266 case XenbusStateInitialised
:
267 case XenbusStateConnected
:
268 if (backend_state
== XenbusStateConnected
) {
272 xen_block_disconnect(xendev
, &local_err
);
274 error_propagate(errp
, local_err
);
278 xen_block_connect(xendev
, &local_err
);
280 error_propagate(errp
, local_err
);
284 xen_device_backend_set_state(xendev
, XenbusStateConnected
);
287 case XenbusStateClosing
:
288 xen_device_backend_set_state(xendev
, XenbusStateClosing
);
291 case XenbusStateClosed
:
292 xen_block_disconnect(xendev
, &local_err
);
294 error_propagate(errp
, local_err
);
298 xen_device_backend_set_state(xendev
, XenbusStateClosed
);
306 static char *disk_to_vbd_name(unsigned int disk
)
308 char *name
, *prefix
= (disk
>= 26) ?
309 disk_to_vbd_name((disk
/ 26) - 1) : g_strdup("");
311 name
= g_strdup_printf("%s%c", prefix
, 'a' + disk
% 26);
317 static void xen_block_get_vdev(Object
*obj
, Visitor
*v
, const char *name
,
318 void *opaque
, Error
**errp
)
320 DeviceState
*dev
= DEVICE(obj
);
321 Property
*prop
= opaque
;
322 XenBlockVdev
*vdev
= qdev_get_prop_ptr(dev
, prop
);
325 switch (vdev
->type
) {
326 case XEN_BLOCK_VDEV_TYPE_DP
:
327 str
= g_strdup_printf("d%lup%lu", vdev
->disk
, vdev
->partition
);
330 case XEN_BLOCK_VDEV_TYPE_XVD
:
331 case XEN_BLOCK_VDEV_TYPE_HD
:
332 case XEN_BLOCK_VDEV_TYPE_SD
: {
333 char *name
= disk_to_vbd_name(vdev
->disk
);
335 str
= g_strdup_printf("%s%s%lu",
336 (vdev
->type
== XEN_BLOCK_VDEV_TYPE_XVD
) ?
338 (vdev
->type
== XEN_BLOCK_VDEV_TYPE_HD
) ?
341 name
, vdev
->partition
);
346 error_setg(errp
, "invalid vdev type");
350 visit_type_str(v
, name
, &str
, errp
);
354 static int vbd_name_to_disk(const char *name
, const char **endp
,
359 while (*name
!= '\0') {
360 if (!g_ascii_isalpha(*name
) || !g_ascii_islower(*name
)) {
365 n
+= *name
++ - 'a' + 1;
378 static void xen_block_set_vdev(Object
*obj
, Visitor
*v
, const char *name
,
379 void *opaque
, Error
**errp
)
381 DeviceState
*dev
= DEVICE(obj
);
382 Property
*prop
= opaque
;
383 XenBlockVdev
*vdev
= qdev_get_prop_ptr(dev
, prop
);
384 Error
*local_err
= NULL
;
389 qdev_prop_set_after_realize(dev
, name
, errp
);
393 visit_type_str(v
, name
, &str
, &local_err
);
395 error_propagate(errp
, local_err
);
399 p
= strchr(str
, 'd');
406 vdev
->type
= XEN_BLOCK_VDEV_TYPE_DP
;
407 } else if (strcmp(str
, "xv") == 0) {
408 vdev
->type
= XEN_BLOCK_VDEV_TYPE_XVD
;
409 } else if (strcmp(str
, "h") == 0) {
410 vdev
->type
= XEN_BLOCK_VDEV_TYPE_HD
;
411 } else if (strcmp(str
, "s") == 0) {
412 vdev
->type
= XEN_BLOCK_VDEV_TYPE_SD
;
417 if (vdev
->type
== XEN_BLOCK_VDEV_TYPE_DP
) {
418 if (qemu_strtoul(p
, &end
, 10, &vdev
->disk
)) {
423 if (*(++end
) == '\0') {
428 if (vbd_name_to_disk(p
, &end
, &vdev
->disk
)) {
436 if (qemu_strtoul(p
, &end
, 10, &vdev
->partition
)) {
447 switch (vdev
->type
) {
448 case XEN_BLOCK_VDEV_TYPE_DP
:
449 case XEN_BLOCK_VDEV_TYPE_XVD
:
450 if (vdev
->disk
< (1 << 4) && vdev
->partition
< (1 << 4)) {
451 vdev
->number
= (202 << 8) | (vdev
->disk
<< 4) |
453 } else if (vdev
->disk
< (1 << 20) && vdev
->partition
< (1 << 8)) {
454 vdev
->number
= (1 << 28) | (vdev
->disk
<< 8) |
461 case XEN_BLOCK_VDEV_TYPE_HD
:
462 if ((vdev
->disk
== 0 || vdev
->disk
== 1) &&
463 vdev
->partition
< (1 << 6)) {
464 vdev
->number
= (3 << 8) | (vdev
->disk
<< 6) | vdev
->partition
;
465 } else if ((vdev
->disk
== 2 || vdev
->disk
== 3) &&
466 vdev
->partition
< (1 << 6)) {
467 vdev
->number
= (22 << 8) | ((vdev
->disk
- 2) << 6) |
474 case XEN_BLOCK_VDEV_TYPE_SD
:
475 if (vdev
->disk
< (1 << 4) && vdev
->partition
< (1 << 4)) {
476 vdev
->number
= (8 << 8) | (vdev
->disk
<< 4) | vdev
->partition
;
490 error_setg(errp
, "invalid virtual disk specifier");
492 vdev
->type
= XEN_BLOCK_VDEV_TYPE_INVALID
;
497 * This property deals with 'vdev' names adhering to the Xen VBD naming
498 * scheme described in:
500 * https://xenbits.xen.org/docs/unstable/man/xen-vbd-interface.7.html
502 const PropertyInfo xen_block_prop_vdev
= {
504 .description
= "Virtual Disk specifier: d*p*/xvd*/hd*/sd*",
505 .get
= xen_block_get_vdev
,
506 .set
= xen_block_set_vdev
,
509 static Property xen_block_props
[] = {
510 DEFINE_PROP("vdev", XenBlockDevice
, props
.vdev
,
511 xen_block_prop_vdev
, XenBlockVdev
),
512 DEFINE_BLOCK_PROPERTIES(XenBlockDevice
, props
.conf
),
513 DEFINE_PROP_UINT32("max-ring-page-order", XenBlockDevice
,
514 props
.max_ring_page_order
, 4),
515 DEFINE_PROP_LINK("iothread", XenBlockDevice
, props
.iothread
,
516 TYPE_IOTHREAD
, IOThread
*),
517 DEFINE_PROP_END_OF_LIST()
520 static void xen_block_class_init(ObjectClass
*class, void *data
)
522 DeviceClass
*dev_class
= DEVICE_CLASS(class);
523 XenDeviceClass
*xendev_class
= XEN_DEVICE_CLASS(class);
525 xendev_class
->backend
= "qdisk";
526 xendev_class
->device
= "vbd";
527 xendev_class
->get_name
= xen_block_get_name
;
528 xendev_class
->realize
= xen_block_realize
;
529 xendev_class
->frontend_changed
= xen_block_frontend_changed
;
530 xendev_class
->unrealize
= xen_block_unrealize
;
532 dev_class
->props
= xen_block_props
;
535 static const TypeInfo xen_block_type_info
= {
536 .name
= TYPE_XEN_BLOCK_DEVICE
,
537 .parent
= TYPE_XEN_DEVICE
,
538 .instance_size
= sizeof(XenBlockDevice
),
540 .class_size
= sizeof(XenBlockDeviceClass
),
541 .class_init
= xen_block_class_init
,
544 static void xen_disk_unrealize(XenBlockDevice
*blockdev
, Error
**errp
)
546 trace_xen_disk_unrealize();
549 static void xen_disk_realize(XenBlockDevice
*blockdev
, Error
**errp
)
551 BlockConf
*conf
= &blockdev
->props
.conf
;
553 trace_xen_disk_realize();
555 blockdev
->device_type
= "disk";
558 error_setg(errp
, "drive property not set");
562 blockdev
->info
= blk_is_read_only(conf
->blk
) ? VDISK_READONLY
: 0;
565 static void xen_disk_class_init(ObjectClass
*class, void *data
)
567 DeviceClass
*dev_class
= DEVICE_CLASS(class);
568 XenBlockDeviceClass
*blockdev_class
= XEN_BLOCK_DEVICE_CLASS(class);
570 blockdev_class
->realize
= xen_disk_realize
;
571 blockdev_class
->unrealize
= xen_disk_unrealize
;
573 dev_class
->desc
= "Xen Disk Device";
576 static const TypeInfo xen_disk_type_info
= {
577 .name
= TYPE_XEN_DISK_DEVICE
,
578 .parent
= TYPE_XEN_BLOCK_DEVICE
,
579 .instance_size
= sizeof(XenDiskDevice
),
580 .class_init
= xen_disk_class_init
,
583 static void xen_cdrom_unrealize(XenBlockDevice
*blockdev
, Error
**errp
)
585 trace_xen_cdrom_unrealize();
588 static void xen_cdrom_realize(XenBlockDevice
*blockdev
, Error
**errp
)
590 BlockConf
*conf
= &blockdev
->props
.conf
;
592 trace_xen_cdrom_realize();
594 blockdev
->device_type
= "cdrom";
599 /* Set up an empty drive */
600 conf
->blk
= blk_new(0, BLK_PERM_ALL
);
602 rc
= blk_attach_dev(conf
->blk
, DEVICE(blockdev
));
604 error_setg_errno(errp
, -rc
, "failed to create drive");
609 blockdev
->info
= VDISK_READONLY
| VDISK_CDROM
;
612 static void xen_cdrom_class_init(ObjectClass
*class, void *data
)
614 DeviceClass
*dev_class
= DEVICE_CLASS(class);
615 XenBlockDeviceClass
*blockdev_class
= XEN_BLOCK_DEVICE_CLASS(class);
617 blockdev_class
->realize
= xen_cdrom_realize
;
618 blockdev_class
->unrealize
= xen_cdrom_unrealize
;
620 dev_class
->desc
= "Xen CD-ROM Device";
623 static const TypeInfo xen_cdrom_type_info
= {
624 .name
= TYPE_XEN_CDROM_DEVICE
,
625 .parent
= TYPE_XEN_BLOCK_DEVICE
,
626 .instance_size
= sizeof(XenCDRomDevice
),
627 .class_init
= xen_cdrom_class_init
,
630 static void xen_block_register_types(void)
632 type_register_static(&xen_block_type_info
);
633 type_register_static(&xen_disk_type_info
);
634 type_register_static(&xen_cdrom_type_info
);
637 type_init(xen_block_register_types
)
639 static void xen_block_blockdev_del(const char *node_name
, Error
**errp
)
641 trace_xen_block_blockdev_del(node_name
);
643 qmp_blockdev_del(node_name
, errp
);
646 static char *xen_block_blockdev_add(const char *id
, QDict
*qdict
,
649 const char *driver
= qdict_get_try_str(qdict
, "driver");
650 BlockdevOptions
*options
= NULL
;
651 Error
*local_err
= NULL
;
656 error_setg(errp
, "no 'driver' parameter");
660 node_name
= g_strdup_printf("%s-%s", id
, driver
);
661 qdict_put_str(qdict
, "node-name", node_name
);
663 trace_xen_block_blockdev_add(node_name
);
665 v
= qobject_input_visitor_new(QOBJECT(qdict
));
666 visit_type_BlockdevOptions(v
, NULL
, &options
, &local_err
);
670 error_propagate(errp
, local_err
);
674 qmp_blockdev_add(options
, &local_err
);
677 error_propagate(errp
, local_err
);
681 qapi_free_BlockdevOptions(options
);
687 qapi_free_BlockdevOptions(options
);
694 static void xen_block_drive_destroy(XenBlockDrive
*drive
, Error
**errp
)
696 char *node_name
= drive
->node_name
;
699 Error
*local_err
= NULL
;
701 xen_block_blockdev_del(node_name
, &local_err
);
703 error_propagate(errp
, local_err
);
707 drive
->node_name
= NULL
;
713 static XenBlockDrive
*xen_block_drive_create(const char *id
,
714 const char *device_type
,
715 QDict
*opts
, Error
**errp
)
717 const char *params
= qdict_get_try_str(opts
, "params");
718 const char *mode
= qdict_get_try_str(opts
, "mode");
719 const char *direct_io_safe
= qdict_get_try_str(opts
, "direct-io-safe");
720 const char *discard_enable
= qdict_get_try_str(opts
, "discard-enable");
722 char *filename
= NULL
;
723 XenBlockDrive
*drive
= NULL
;
724 Error
*local_err
= NULL
;
729 char **v
= g_strsplit(params
, ":", 2);
732 filename
= g_strdup(v
[0]);
733 driver
= g_strdup("raw");
735 if (strcmp(v
[0], "aio") == 0) {
736 driver
= g_strdup("raw");
737 } else if (strcmp(v
[0], "vhd") == 0) {
738 driver
= g_strdup("vpc");
740 driver
= g_strdup(v
[0]);
742 filename
= g_strdup(v
[1]);
747 error_setg(errp
, "no params");
754 drive
= g_new0(XenBlockDrive
, 1);
755 drive
->id
= g_strdup(id
);
757 file_layer
= qdict_new();
759 qdict_put_str(file_layer
, "driver", "file");
760 qdict_put_str(file_layer
, "filename", filename
);
763 if (mode
&& *mode
!= 'w') {
764 qdict_put_bool(file_layer
, "read-only", true);
767 if (direct_io_safe
) {
770 if (!qemu_strtoul(direct_io_safe
, NULL
, 2, &value
) && !!value
) {
771 QDict
*cache_qdict
= qdict_new();
773 qdict_put_bool(cache_qdict
, "direct", true);
774 qdict_put_obj(file_layer
, "cache", QOBJECT(cache_qdict
));
776 qdict_put_str(file_layer
, "aio", "native");
780 if (discard_enable
) {
783 if (!qemu_strtoul(discard_enable
, NULL
, 2, &value
) && !!value
) {
784 qdict_put_str(file_layer
, "discard", "unmap");
789 * It is necessary to turn file locking off as an emulated device
790 * may have already opened the same image file.
792 qdict_put_str(file_layer
, "locking", "off");
794 driver_layer
= qdict_new();
796 qdict_put_str(driver_layer
, "driver", driver
);
799 qdict_put_obj(driver_layer
, "file", QOBJECT(file_layer
));
801 g_assert(!drive
->node_name
);
802 drive
->node_name
= xen_block_blockdev_add(drive
->id
, driver_layer
,
805 qobject_unref(driver_layer
);
809 error_propagate(errp
, local_err
);
810 xen_block_drive_destroy(drive
, NULL
);
817 static const char *xen_block_drive_get_node_name(XenBlockDrive
*drive
)
819 return drive
->node_name
? drive
->node_name
: "";
822 static void xen_block_iothread_destroy(XenBlockIOThread
*iothread
,
825 qmp_object_del(iothread
->id
, errp
);
827 g_free(iothread
->id
);
831 static XenBlockIOThread
*xen_block_iothread_create(const char *id
,
834 XenBlockIOThread
*iothread
= g_new(XenBlockIOThread
, 1);
835 Error
*local_err
= NULL
;
837 iothread
->id
= g_strdup(id
);
839 qmp_object_add(TYPE_IOTHREAD
, id
, false, NULL
, &local_err
);
841 error_propagate(errp
, local_err
);
843 g_free(iothread
->id
);
851 static void xen_block_device_create(XenBackendInstance
*backend
,
852 QDict
*opts
, Error
**errp
)
854 XenBus
*xenbus
= xen_backend_get_bus(backend
);
855 const char *name
= xen_backend_get_name(backend
);
856 unsigned long number
;
857 const char *vdev
, *device_type
;
858 XenBlockDrive
*drive
= NULL
;
859 XenBlockIOThread
*iothread
= NULL
;
860 XenDevice
*xendev
= NULL
;
861 Error
*local_err
= NULL
;
863 XenBlockDevice
*blockdev
;
865 if (qemu_strtoul(name
, NULL
, 10, &number
)) {
866 error_setg(errp
, "failed to parse name '%s'", name
);
870 trace_xen_block_device_create(number
);
872 vdev
= qdict_get_try_str(opts
, "dev");
874 error_setg(errp
, "no dev parameter");
878 device_type
= qdict_get_try_str(opts
, "device-type");
880 error_setg(errp
, "no device-type parameter");
884 if (!strcmp(device_type
, "disk")) {
885 type
= TYPE_XEN_DISK_DEVICE
;
886 } else if (!strcmp(device_type
, "cdrom")) {
887 type
= TYPE_XEN_CDROM_DEVICE
;
889 error_setg(errp
, "invalid device-type parameter '%s'", device_type
);
893 drive
= xen_block_drive_create(vdev
, device_type
, opts
, &local_err
);
895 error_propagate_prepend(errp
, local_err
, "failed to create drive: ");
899 iothread
= xen_block_iothread_create(vdev
, &local_err
);
901 error_propagate_prepend(errp
, local_err
,
902 "failed to create iothread: ");
906 xendev
= XEN_DEVICE(qdev_create(BUS(xenbus
), type
));
907 blockdev
= XEN_BLOCK_DEVICE(xendev
);
909 object_property_set_str(OBJECT(xendev
), vdev
, "vdev", &local_err
);
911 error_propagate_prepend(errp
, local_err
, "failed to set 'vdev': ");
915 object_property_set_str(OBJECT(xendev
),
916 xen_block_drive_get_node_name(drive
), "drive",
919 error_propagate_prepend(errp
, local_err
, "failed to set 'drive': ");
923 object_property_set_str(OBJECT(xendev
), iothread
->id
, "iothread",
926 error_propagate_prepend(errp
, local_err
,
927 "failed to set 'iothread': ");
931 blockdev
->iothread
= iothread
;
932 blockdev
->drive
= drive
;
934 object_property_set_bool(OBJECT(xendev
), true, "realized", &local_err
);
936 error_propagate_prepend(errp
, local_err
,
937 "realization of device %s failed: ",
942 xen_backend_set_device(backend
, xendev
);
947 object_unparent(OBJECT(xendev
));
951 xen_block_iothread_destroy(iothread
, NULL
);
955 xen_block_drive_destroy(drive
, NULL
);
959 static void xen_block_device_destroy(XenBackendInstance
*backend
,
962 XenDevice
*xendev
= xen_backend_get_device(backend
);
963 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
964 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
965 XenBlockDrive
*drive
= blockdev
->drive
;
966 XenBlockIOThread
*iothread
= blockdev
->iothread
;
968 trace_xen_block_device_destroy(vdev
->number
);
970 object_unparent(OBJECT(xendev
));
973 Error
*local_err
= NULL
;
975 xen_block_iothread_destroy(iothread
, &local_err
);
977 error_propagate_prepend(errp
, local_err
,
978 "failed to destroy iothread: ");
984 Error
*local_err
= NULL
;
986 xen_block_drive_destroy(drive
, &local_err
);
988 error_propagate_prepend(errp
, local_err
,
989 "failed to destroy drive: ");
994 static const XenBackendInfo xen_block_backend_info
= {
996 .create
= xen_block_device_create
,
997 .destroy
= xen_block_device_destroy
,
1000 static void xen_block_register_backend(void)
1002 xen_backend_register(&xen_block_backend_info
);
1005 xen_backend_init(xen_block_register_backend
);