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/module.h"
11 #include "qemu/option.h"
12 #include "qapi/error.h"
13 #include "qapi/qapi-commands-block-core.h"
14 #include "qapi/qapi-commands-misc.h"
15 #include "qapi/qapi-visit-block-core.h"
16 #include "qapi/qobject-input-visitor.h"
17 #include "qapi/visitor.h"
18 #include "qapi/qmp/qdict.h"
19 #include "qapi/qmp/qstring.h"
21 #include "hw/xen/xen_common.h"
22 #include "hw/block/xen_blkif.h"
23 #include "hw/xen/xen-block.h"
24 #include "hw/xen/xen-backend.h"
25 #include "sysemu/blockdev.h"
26 #include "sysemu/block-backend.h"
27 #include "sysemu/iothread.h"
28 #include "dataplane/xen-block.h"
31 static char *xen_block_get_name(XenDevice
*xendev
, Error
**errp
)
33 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
34 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
36 return g_strdup_printf("%lu", vdev
->number
);
39 static void xen_block_disconnect(XenDevice
*xendev
, Error
**errp
)
41 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
42 const char *type
= object_get_typename(OBJECT(blockdev
));
43 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
45 trace_xen_block_disconnect(type
, vdev
->disk
, vdev
->partition
);
47 xen_block_dataplane_stop(blockdev
->dataplane
);
50 static void xen_block_connect(XenDevice
*xendev
, Error
**errp
)
52 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
53 const char *type
= object_get_typename(OBJECT(blockdev
));
54 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
55 BlockConf
*conf
= &blockdev
->props
.conf
;
56 unsigned int feature_large_sector_size
;
57 unsigned int order
, nr_ring_ref
, *ring_ref
, event_channel
, protocol
;
60 trace_xen_block_connect(type
, vdev
->disk
, vdev
->partition
);
62 if (xen_device_frontend_scanf(xendev
, "feature-large-sector-size", "%u",
63 &feature_large_sector_size
) != 1) {
64 feature_large_sector_size
= 0;
67 if (feature_large_sector_size
!= 1 &&
68 conf
->logical_block_size
!= XEN_BLKIF_SECTOR_SIZE
) {
69 error_setg(errp
, "logical_block_size != %u not supported by frontend",
70 XEN_BLKIF_SECTOR_SIZE
);
74 if (xen_device_frontend_scanf(xendev
, "ring-page-order", "%u",
77 ring_ref
= g_new(unsigned int, nr_ring_ref
);
79 if (xen_device_frontend_scanf(xendev
, "ring-ref", "%u",
81 error_setg(errp
, "failed to read ring-ref");
85 } else if (order
<= blockdev
->props
.max_ring_page_order
) {
88 nr_ring_ref
= 1 << order
;
89 ring_ref
= g_new(unsigned int, nr_ring_ref
);
91 for (i
= 0; i
< nr_ring_ref
; i
++) {
92 const char *key
= g_strdup_printf("ring-ref%u", i
);
94 if (xen_device_frontend_scanf(xendev
, key
, "%u",
96 error_setg(errp
, "failed to read %s", key
);
97 g_free((gpointer
)key
);
102 g_free((gpointer
)key
);
105 error_setg(errp
, "invalid ring-page-order (%d)", order
);
109 if (xen_device_frontend_scanf(xendev
, "event-channel", "%u",
110 &event_channel
) != 1) {
111 error_setg(errp
, "failed to read event-channel");
116 if (xen_device_frontend_scanf(xendev
, "protocol", "%ms",
118 protocol
= BLKIF_PROTOCOL_NATIVE
;
120 if (strcmp(str
, XEN_IO_PROTO_ABI_X86_32
) == 0) {
121 protocol
= BLKIF_PROTOCOL_X86_32
;
122 } else if (strcmp(str
, XEN_IO_PROTO_ABI_X86_64
) == 0) {
123 protocol
= BLKIF_PROTOCOL_X86_64
;
125 protocol
= BLKIF_PROTOCOL_NATIVE
;
131 xen_block_dataplane_start(blockdev
->dataplane
, ring_ref
, nr_ring_ref
,
132 event_channel
, protocol
, errp
);
137 static void xen_block_unrealize(XenDevice
*xendev
, Error
**errp
)
139 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
140 XenBlockDeviceClass
*blockdev_class
=
141 XEN_BLOCK_DEVICE_GET_CLASS(xendev
);
142 const char *type
= object_get_typename(OBJECT(blockdev
));
143 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
145 if (vdev
->type
== XEN_BLOCK_VDEV_TYPE_INVALID
) {
149 trace_xen_block_unrealize(type
, vdev
->disk
, vdev
->partition
);
151 /* Disconnect from the frontend in case this has not already happened */
152 xen_block_disconnect(xendev
, NULL
);
154 xen_block_dataplane_destroy(blockdev
->dataplane
);
155 blockdev
->dataplane
= NULL
;
157 if (blockdev_class
->unrealize
) {
158 blockdev_class
->unrealize(blockdev
, errp
);
162 static void xen_block_set_size(XenBlockDevice
*blockdev
)
164 const char *type
= object_get_typename(OBJECT(blockdev
));
165 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
166 BlockConf
*conf
= &blockdev
->props
.conf
;
167 int64_t sectors
= blk_getlength(conf
->blk
) / conf
->logical_block_size
;
168 XenDevice
*xendev
= XEN_DEVICE(blockdev
);
170 trace_xen_block_size(type
, vdev
->disk
, vdev
->partition
, sectors
);
172 xen_device_backend_printf(xendev
, "sectors", "%"PRIi64
, sectors
);
175 static void xen_block_resize_cb(void *opaque
)
177 XenBlockDevice
*blockdev
= opaque
;
178 XenDevice
*xendev
= XEN_DEVICE(blockdev
);
179 enum xenbus_state state
= xen_device_backend_get_state(xendev
);
181 xen_block_set_size(blockdev
);
184 * Mimic the behaviour of Linux xen-blkback and re-write the state
185 * to trigger the frontend watch.
187 xen_device_backend_printf(xendev
, "state", "%u", state
);
190 static const BlockDevOps xen_block_dev_ops
= {
191 .resize_cb
= xen_block_resize_cb
,
194 static void xen_block_realize(XenDevice
*xendev
, Error
**errp
)
196 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
197 XenBlockDeviceClass
*blockdev_class
=
198 XEN_BLOCK_DEVICE_GET_CLASS(xendev
);
199 const char *type
= object_get_typename(OBJECT(blockdev
));
200 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
201 BlockConf
*conf
= &blockdev
->props
.conf
;
202 BlockBackend
*blk
= conf
->blk
;
203 Error
*local_err
= NULL
;
205 if (vdev
->type
== XEN_BLOCK_VDEV_TYPE_INVALID
) {
206 error_setg(errp
, "vdev property not set");
210 trace_xen_block_realize(type
, vdev
->disk
, vdev
->partition
);
212 if (blockdev_class
->realize
) {
213 blockdev_class
->realize(blockdev
, &local_err
);
215 error_propagate(errp
, local_err
);
221 * The blkif protocol does not deal with removable media, so it must
222 * always be present, even for CDRom devices.
225 if (!blk_is_inserted(blk
)) {
226 error_setg(errp
, "device needs media, but drive is empty");
230 if (!blkconf_apply_backend_options(conf
, blockdev
->info
& VDISK_READONLY
,
235 if (!(blockdev
->info
& VDISK_CDROM
) &&
236 !blkconf_geometry(conf
, NULL
, 65535, 255, 255, errp
)) {
240 blkconf_blocksizes(conf
);
242 if (conf
->logical_block_size
> conf
->physical_block_size
) {
244 errp
, "logical_block_size > physical_block_size not supported");
248 blk_set_dev_ops(blk
, &xen_block_dev_ops
, blockdev
);
249 blk_set_guest_block_size(blk
, conf
->logical_block_size
);
251 if (conf
->discard_granularity
== -1) {
252 conf
->discard_granularity
= conf
->physical_block_size
;
255 if (blk_get_flags(blk
) & BDRV_O_UNMAP
) {
256 xen_device_backend_printf(xendev
, "feature-discard", "%u", 1);
257 xen_device_backend_printf(xendev
, "discard-granularity", "%u",
258 conf
->discard_granularity
);
261 xen_device_backend_printf(xendev
, "feature-flush-cache", "%u", 1);
262 xen_device_backend_printf(xendev
, "max-ring-page-order", "%u",
263 blockdev
->props
.max_ring_page_order
);
264 xen_device_backend_printf(xendev
, "info", "%u", blockdev
->info
);
266 xen_device_frontend_printf(xendev
, "virtual-device", "%lu",
268 xen_device_frontend_printf(xendev
, "device-type", "%s",
269 blockdev
->device_type
);
271 xen_device_backend_printf(xendev
, "sector-size", "%u",
272 conf
->logical_block_size
);
274 xen_block_set_size(blockdev
);
276 blockdev
->dataplane
=
277 xen_block_dataplane_create(xendev
, blk
, conf
->logical_block_size
,
278 blockdev
->props
.iothread
);
281 static void xen_block_frontend_changed(XenDevice
*xendev
,
282 enum xenbus_state frontend_state
,
285 enum xenbus_state backend_state
= xen_device_backend_get_state(xendev
);
286 Error
*local_err
= NULL
;
288 switch (frontend_state
) {
289 case XenbusStateInitialised
:
290 case XenbusStateConnected
:
291 if (backend_state
== XenbusStateConnected
) {
295 xen_block_disconnect(xendev
, &local_err
);
297 error_propagate(errp
, local_err
);
301 xen_block_connect(xendev
, &local_err
);
303 error_propagate(errp
, local_err
);
307 xen_device_backend_set_state(xendev
, XenbusStateConnected
);
310 case XenbusStateClosing
:
311 xen_device_backend_set_state(xendev
, XenbusStateClosing
);
314 case XenbusStateClosed
:
315 xen_block_disconnect(xendev
, &local_err
);
317 error_propagate(errp
, local_err
);
321 xen_device_backend_set_state(xendev
, XenbusStateClosed
);
329 static char *disk_to_vbd_name(unsigned int disk
)
331 char *name
, *prefix
= (disk
>= 26) ?
332 disk_to_vbd_name((disk
/ 26) - 1) : g_strdup("");
334 name
= g_strdup_printf("%s%c", prefix
, 'a' + disk
% 26);
340 static void xen_block_get_vdev(Object
*obj
, Visitor
*v
, const char *name
,
341 void *opaque
, Error
**errp
)
343 DeviceState
*dev
= DEVICE(obj
);
344 Property
*prop
= opaque
;
345 XenBlockVdev
*vdev
= qdev_get_prop_ptr(dev
, prop
);
348 switch (vdev
->type
) {
349 case XEN_BLOCK_VDEV_TYPE_DP
:
350 str
= g_strdup_printf("d%lup%lu", vdev
->disk
, vdev
->partition
);
353 case XEN_BLOCK_VDEV_TYPE_XVD
:
354 case XEN_BLOCK_VDEV_TYPE_HD
:
355 case XEN_BLOCK_VDEV_TYPE_SD
: {
356 char *name
= disk_to_vbd_name(vdev
->disk
);
358 str
= g_strdup_printf("%s%s%lu",
359 (vdev
->type
== XEN_BLOCK_VDEV_TYPE_XVD
) ?
361 (vdev
->type
== XEN_BLOCK_VDEV_TYPE_HD
) ?
364 name
, vdev
->partition
);
369 error_setg(errp
, "invalid vdev type");
373 visit_type_str(v
, name
, &str
, errp
);
377 static int vbd_name_to_disk(const char *name
, const char **endp
,
382 while (*name
!= '\0') {
383 if (!g_ascii_isalpha(*name
) || !g_ascii_islower(*name
)) {
388 n
+= *name
++ - 'a' + 1;
401 static void xen_block_set_vdev(Object
*obj
, Visitor
*v
, const char *name
,
402 void *opaque
, Error
**errp
)
404 DeviceState
*dev
= DEVICE(obj
);
405 Property
*prop
= opaque
;
406 XenBlockVdev
*vdev
= qdev_get_prop_ptr(dev
, prop
);
407 Error
*local_err
= NULL
;
412 qdev_prop_set_after_realize(dev
, name
, errp
);
416 visit_type_str(v
, name
, &str
, &local_err
);
418 error_propagate(errp
, local_err
);
422 p
= strchr(str
, 'd');
429 vdev
->type
= XEN_BLOCK_VDEV_TYPE_DP
;
430 } else if (strcmp(str
, "xv") == 0) {
431 vdev
->type
= XEN_BLOCK_VDEV_TYPE_XVD
;
432 } else if (strcmp(str
, "h") == 0) {
433 vdev
->type
= XEN_BLOCK_VDEV_TYPE_HD
;
434 } else if (strcmp(str
, "s") == 0) {
435 vdev
->type
= XEN_BLOCK_VDEV_TYPE_SD
;
440 if (vdev
->type
== XEN_BLOCK_VDEV_TYPE_DP
) {
441 if (qemu_strtoul(p
, &end
, 10, &vdev
->disk
)) {
446 if (*(++end
) == '\0') {
451 if (vbd_name_to_disk(p
, &end
, &vdev
->disk
)) {
459 if (qemu_strtoul(p
, &end
, 10, &vdev
->partition
)) {
470 switch (vdev
->type
) {
471 case XEN_BLOCK_VDEV_TYPE_DP
:
472 case XEN_BLOCK_VDEV_TYPE_XVD
:
473 if (vdev
->disk
< (1 << 4) && vdev
->partition
< (1 << 4)) {
474 vdev
->number
= (202 << 8) | (vdev
->disk
<< 4) |
476 } else if (vdev
->disk
< (1 << 20) && vdev
->partition
< (1 << 8)) {
477 vdev
->number
= (1 << 28) | (vdev
->disk
<< 8) |
484 case XEN_BLOCK_VDEV_TYPE_HD
:
485 if ((vdev
->disk
== 0 || vdev
->disk
== 1) &&
486 vdev
->partition
< (1 << 6)) {
487 vdev
->number
= (3 << 8) | (vdev
->disk
<< 6) | vdev
->partition
;
488 } else if ((vdev
->disk
== 2 || vdev
->disk
== 3) &&
489 vdev
->partition
< (1 << 6)) {
490 vdev
->number
= (22 << 8) | ((vdev
->disk
- 2) << 6) |
497 case XEN_BLOCK_VDEV_TYPE_SD
:
498 if (vdev
->disk
< (1 << 4) && vdev
->partition
< (1 << 4)) {
499 vdev
->number
= (8 << 8) | (vdev
->disk
<< 4) | vdev
->partition
;
513 error_setg(errp
, "invalid virtual disk specifier");
515 vdev
->type
= XEN_BLOCK_VDEV_TYPE_INVALID
;
520 * This property deals with 'vdev' names adhering to the Xen VBD naming
521 * scheme described in:
523 * https://xenbits.xen.org/docs/unstable/man/xen-vbd-interface.7.html
525 const PropertyInfo xen_block_prop_vdev
= {
527 .description
= "Virtual Disk specifier: d*p*/xvd*/hd*/sd*",
528 .get
= xen_block_get_vdev
,
529 .set
= xen_block_set_vdev
,
532 static Property xen_block_props
[] = {
533 DEFINE_PROP("vdev", XenBlockDevice
, props
.vdev
,
534 xen_block_prop_vdev
, XenBlockVdev
),
535 DEFINE_BLOCK_PROPERTIES(XenBlockDevice
, props
.conf
),
536 DEFINE_PROP_UINT32("max-ring-page-order", XenBlockDevice
,
537 props
.max_ring_page_order
, 4),
538 DEFINE_PROP_LINK("iothread", XenBlockDevice
, props
.iothread
,
539 TYPE_IOTHREAD
, IOThread
*),
540 DEFINE_PROP_END_OF_LIST()
543 static void xen_block_class_init(ObjectClass
*class, void *data
)
545 DeviceClass
*dev_class
= DEVICE_CLASS(class);
546 XenDeviceClass
*xendev_class
= XEN_DEVICE_CLASS(class);
548 xendev_class
->backend
= "qdisk";
549 xendev_class
->device
= "vbd";
550 xendev_class
->get_name
= xen_block_get_name
;
551 xendev_class
->realize
= xen_block_realize
;
552 xendev_class
->frontend_changed
= xen_block_frontend_changed
;
553 xendev_class
->unrealize
= xen_block_unrealize
;
555 dev_class
->props
= xen_block_props
;
558 static const TypeInfo xen_block_type_info
= {
559 .name
= TYPE_XEN_BLOCK_DEVICE
,
560 .parent
= TYPE_XEN_DEVICE
,
561 .instance_size
= sizeof(XenBlockDevice
),
563 .class_size
= sizeof(XenBlockDeviceClass
),
564 .class_init
= xen_block_class_init
,
567 static void xen_disk_unrealize(XenBlockDevice
*blockdev
, Error
**errp
)
569 trace_xen_disk_unrealize();
572 static void xen_disk_realize(XenBlockDevice
*blockdev
, Error
**errp
)
574 BlockConf
*conf
= &blockdev
->props
.conf
;
576 trace_xen_disk_realize();
578 blockdev
->device_type
= "disk";
581 error_setg(errp
, "drive property not set");
585 blockdev
->info
= blk_is_read_only(conf
->blk
) ? VDISK_READONLY
: 0;
588 static void xen_disk_class_init(ObjectClass
*class, void *data
)
590 DeviceClass
*dev_class
= DEVICE_CLASS(class);
591 XenBlockDeviceClass
*blockdev_class
= XEN_BLOCK_DEVICE_CLASS(class);
593 blockdev_class
->realize
= xen_disk_realize
;
594 blockdev_class
->unrealize
= xen_disk_unrealize
;
596 dev_class
->desc
= "Xen Disk Device";
599 static const TypeInfo xen_disk_type_info
= {
600 .name
= TYPE_XEN_DISK_DEVICE
,
601 .parent
= TYPE_XEN_BLOCK_DEVICE
,
602 .instance_size
= sizeof(XenDiskDevice
),
603 .class_init
= xen_disk_class_init
,
606 static void xen_cdrom_unrealize(XenBlockDevice
*blockdev
, Error
**errp
)
608 trace_xen_cdrom_unrealize();
611 static void xen_cdrom_realize(XenBlockDevice
*blockdev
, Error
**errp
)
613 BlockConf
*conf
= &blockdev
->props
.conf
;
615 trace_xen_cdrom_realize();
617 blockdev
->device_type
= "cdrom";
622 /* Set up an empty drive */
623 conf
->blk
= blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL
);
625 rc
= blk_attach_dev(conf
->blk
, DEVICE(blockdev
));
627 error_setg_errno(errp
, -rc
, "failed to create drive");
632 blockdev
->info
= VDISK_READONLY
| VDISK_CDROM
;
635 static void xen_cdrom_class_init(ObjectClass
*class, void *data
)
637 DeviceClass
*dev_class
= DEVICE_CLASS(class);
638 XenBlockDeviceClass
*blockdev_class
= XEN_BLOCK_DEVICE_CLASS(class);
640 blockdev_class
->realize
= xen_cdrom_realize
;
641 blockdev_class
->unrealize
= xen_cdrom_unrealize
;
643 dev_class
->desc
= "Xen CD-ROM Device";
646 static const TypeInfo xen_cdrom_type_info
= {
647 .name
= TYPE_XEN_CDROM_DEVICE
,
648 .parent
= TYPE_XEN_BLOCK_DEVICE
,
649 .instance_size
= sizeof(XenCDRomDevice
),
650 .class_init
= xen_cdrom_class_init
,
653 static void xen_block_register_types(void)
655 type_register_static(&xen_block_type_info
);
656 type_register_static(&xen_disk_type_info
);
657 type_register_static(&xen_cdrom_type_info
);
660 type_init(xen_block_register_types
)
662 static void xen_block_blockdev_del(const char *node_name
, Error
**errp
)
664 trace_xen_block_blockdev_del(node_name
);
666 qmp_blockdev_del(node_name
, errp
);
669 static char *xen_block_blockdev_add(const char *id
, QDict
*qdict
,
672 const char *driver
= qdict_get_try_str(qdict
, "driver");
673 BlockdevOptions
*options
= NULL
;
674 Error
*local_err
= NULL
;
679 error_setg(errp
, "no 'driver' parameter");
683 node_name
= g_strdup_printf("%s-%s", id
, driver
);
684 qdict_put_str(qdict
, "node-name", node_name
);
686 trace_xen_block_blockdev_add(node_name
);
688 v
= qobject_input_visitor_new(QOBJECT(qdict
));
689 visit_type_BlockdevOptions(v
, NULL
, &options
, &local_err
);
693 error_propagate(errp
, local_err
);
697 qmp_blockdev_add(options
, &local_err
);
700 error_propagate(errp
, local_err
);
704 qapi_free_BlockdevOptions(options
);
710 qapi_free_BlockdevOptions(options
);
717 static void xen_block_drive_destroy(XenBlockDrive
*drive
, Error
**errp
)
719 char *node_name
= drive
->node_name
;
722 Error
*local_err
= NULL
;
724 xen_block_blockdev_del(node_name
, &local_err
);
726 error_propagate(errp
, local_err
);
730 drive
->node_name
= NULL
;
736 static XenBlockDrive
*xen_block_drive_create(const char *id
,
737 const char *device_type
,
738 QDict
*opts
, Error
**errp
)
740 const char *params
= qdict_get_try_str(opts
, "params");
741 const char *mode
= qdict_get_try_str(opts
, "mode");
742 const char *direct_io_safe
= qdict_get_try_str(opts
, "direct-io-safe");
743 const char *discard_enable
= qdict_get_try_str(opts
, "discard-enable");
745 char *filename
= NULL
;
746 XenBlockDrive
*drive
= NULL
;
747 Error
*local_err
= NULL
;
752 char **v
= g_strsplit(params
, ":", 2);
755 filename
= g_strdup(v
[0]);
756 driver
= g_strdup("raw");
758 if (strcmp(v
[0], "aio") == 0) {
759 driver
= g_strdup("raw");
760 } else if (strcmp(v
[0], "vhd") == 0) {
761 driver
= g_strdup("vpc");
763 driver
= g_strdup(v
[0]);
765 filename
= g_strdup(v
[1]);
770 error_setg(errp
, "no params");
777 drive
= g_new0(XenBlockDrive
, 1);
778 drive
->id
= g_strdup(id
);
780 file_layer
= qdict_new();
781 driver_layer
= qdict_new();
783 qdict_put_str(file_layer
, "driver", "file");
784 qdict_put_str(file_layer
, "filename", filename
);
787 if (mode
&& *mode
!= 'w') {
788 qdict_put_bool(file_layer
, "read-only", true);
791 if (direct_io_safe
) {
794 if (!qemu_strtoul(direct_io_safe
, NULL
, 2, &value
) && !!value
) {
795 QDict
*cache_qdict
= qdict_new();
797 qdict_put_bool(cache_qdict
, "direct", true);
798 qdict_put(file_layer
, "cache", cache_qdict
);
800 qdict_put_str(file_layer
, "aio", "native");
804 if (discard_enable
) {
807 if (!qemu_strtoul(discard_enable
, NULL
, 2, &value
) && !!value
) {
808 qdict_put_str(file_layer
, "discard", "unmap");
809 qdict_put_str(driver_layer
, "discard", "unmap");
814 * It is necessary to turn file locking off as an emulated device
815 * may have already opened the same image file.
817 qdict_put_str(file_layer
, "locking", "off");
819 qdict_put_str(driver_layer
, "driver", driver
);
822 qdict_put(driver_layer
, "file", file_layer
);
824 g_assert(!drive
->node_name
);
825 drive
->node_name
= xen_block_blockdev_add(drive
->id
, driver_layer
,
828 qobject_unref(driver_layer
);
832 error_propagate(errp
, local_err
);
833 xen_block_drive_destroy(drive
, NULL
);
840 static const char *xen_block_drive_get_node_name(XenBlockDrive
*drive
)
842 return drive
->node_name
? drive
->node_name
: "";
845 static void xen_block_iothread_destroy(XenBlockIOThread
*iothread
,
848 qmp_object_del(iothread
->id
, errp
);
850 g_free(iothread
->id
);
854 static XenBlockIOThread
*xen_block_iothread_create(const char *id
,
857 XenBlockIOThread
*iothread
= g_new(XenBlockIOThread
, 1);
858 Error
*local_err
= NULL
;
860 iothread
->id
= g_strdup(id
);
862 qmp_object_add(TYPE_IOTHREAD
, id
, false, NULL
, &local_err
);
864 error_propagate(errp
, local_err
);
866 g_free(iothread
->id
);
874 static void xen_block_device_create(XenBackendInstance
*backend
,
875 QDict
*opts
, Error
**errp
)
877 XenBus
*xenbus
= xen_backend_get_bus(backend
);
878 const char *name
= xen_backend_get_name(backend
);
879 unsigned long number
;
880 const char *vdev
, *device_type
;
881 XenBlockDrive
*drive
= NULL
;
882 XenBlockIOThread
*iothread
= NULL
;
883 XenDevice
*xendev
= NULL
;
884 Error
*local_err
= NULL
;
886 XenBlockDevice
*blockdev
;
888 if (qemu_strtoul(name
, NULL
, 10, &number
)) {
889 error_setg(errp
, "failed to parse name '%s'", name
);
893 trace_xen_block_device_create(number
);
895 vdev
= qdict_get_try_str(opts
, "dev");
897 error_setg(errp
, "no dev parameter");
901 device_type
= qdict_get_try_str(opts
, "device-type");
903 error_setg(errp
, "no device-type parameter");
907 if (!strcmp(device_type
, "disk")) {
908 type
= TYPE_XEN_DISK_DEVICE
;
909 } else if (!strcmp(device_type
, "cdrom")) {
910 type
= TYPE_XEN_CDROM_DEVICE
;
912 error_setg(errp
, "invalid device-type parameter '%s'", device_type
);
916 drive
= xen_block_drive_create(vdev
, device_type
, opts
, &local_err
);
918 error_propagate_prepend(errp
, local_err
, "failed to create drive: ");
922 iothread
= xen_block_iothread_create(vdev
, &local_err
);
924 error_propagate_prepend(errp
, local_err
,
925 "failed to create iothread: ");
929 xendev
= XEN_DEVICE(qdev_create(BUS(xenbus
), type
));
930 blockdev
= XEN_BLOCK_DEVICE(xendev
);
932 object_property_set_str(OBJECT(xendev
), vdev
, "vdev", &local_err
);
934 error_propagate_prepend(errp
, local_err
, "failed to set 'vdev': ");
938 object_property_set_str(OBJECT(xendev
),
939 xen_block_drive_get_node_name(drive
), "drive",
942 error_propagate_prepend(errp
, local_err
, "failed to set 'drive': ");
946 object_property_set_str(OBJECT(xendev
), iothread
->id
, "iothread",
949 error_propagate_prepend(errp
, local_err
,
950 "failed to set 'iothread': ");
954 blockdev
->iothread
= iothread
;
955 blockdev
->drive
= drive
;
957 object_property_set_bool(OBJECT(xendev
), true, "realized", &local_err
);
959 error_propagate_prepend(errp
, local_err
,
960 "realization of device %s failed: ",
965 xen_backend_set_device(backend
, xendev
);
970 object_unparent(OBJECT(xendev
));
974 xen_block_iothread_destroy(iothread
, NULL
);
978 xen_block_drive_destroy(drive
, NULL
);
982 static void xen_block_device_destroy(XenBackendInstance
*backend
,
985 XenDevice
*xendev
= xen_backend_get_device(backend
);
986 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
987 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
988 XenBlockDrive
*drive
= blockdev
->drive
;
989 XenBlockIOThread
*iothread
= blockdev
->iothread
;
991 trace_xen_block_device_destroy(vdev
->number
);
993 object_unparent(OBJECT(xendev
));
996 Error
*local_err
= NULL
;
998 xen_block_iothread_destroy(iothread
, &local_err
);
1000 error_propagate_prepend(errp
, local_err
,
1001 "failed to destroy iothread: ");
1007 Error
*local_err
= NULL
;
1009 xen_block_drive_destroy(drive
, &local_err
);
1011 error_propagate_prepend(errp
, local_err
,
1012 "failed to destroy drive: ");
1017 static const XenBackendInfo xen_block_backend_info
= {
1019 .create
= xen_block_device_create
,
1020 .destroy
= xen_block_device_destroy
,
1023 static void xen_block_register_backend(void)
1025 xen_backend_register(&xen_block_backend_info
);
1028 xen_backend_init(xen_block_register_backend
);