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/main-loop.h"
11 #include "qemu/module.h"
12 #include "qemu/option.h"
13 #include "qapi/error.h"
14 #include "qapi/qapi-commands-block-core.h"
15 #include "qapi/qapi-commands-qom.h"
16 #include "qapi/qapi-visit-block-core.h"
17 #include "qapi/qobject-input-visitor.h"
18 #include "qapi/visitor.h"
19 #include "qapi/qmp/qdict.h"
20 #include "qapi/qmp/qstring.h"
21 #include "hw/xen/xen_common.h"
22 #include "hw/block/xen_blkif.h"
23 #include "hw/qdev-properties.h"
24 #include "hw/xen/xen-block.h"
25 #include "hw/xen/xen-backend.h"
26 #include "sysemu/blockdev.h"
27 #include "sysemu/block-backend.h"
28 #include "sysemu/iothread.h"
29 #include "dataplane/xen-block.h"
32 static char *xen_block_get_name(XenDevice
*xendev
, Error
**errp
)
34 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
35 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
37 return g_strdup_printf("%lu", vdev
->number
);
40 static void xen_block_disconnect(XenDevice
*xendev
, Error
**errp
)
42 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
43 const char *type
= object_get_typename(OBJECT(blockdev
));
44 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
46 trace_xen_block_disconnect(type
, vdev
->disk
, vdev
->partition
);
48 xen_block_dataplane_stop(blockdev
->dataplane
);
51 static void xen_block_connect(XenDevice
*xendev
, Error
**errp
)
53 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
54 const char *type
= object_get_typename(OBJECT(blockdev
));
55 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
56 BlockConf
*conf
= &blockdev
->props
.conf
;
57 unsigned int feature_large_sector_size
;
58 unsigned int order
, nr_ring_ref
, *ring_ref
, event_channel
, protocol
;
61 trace_xen_block_connect(type
, vdev
->disk
, vdev
->partition
);
63 if (xen_device_frontend_scanf(xendev
, "feature-large-sector-size", "%u",
64 &feature_large_sector_size
) != 1) {
65 feature_large_sector_size
= 0;
68 if (feature_large_sector_size
!= 1 &&
69 conf
->logical_block_size
!= XEN_BLKIF_SECTOR_SIZE
) {
70 error_setg(errp
, "logical_block_size != %u not supported by frontend",
71 XEN_BLKIF_SECTOR_SIZE
);
75 if (xen_device_frontend_scanf(xendev
, "ring-page-order", "%u",
78 ring_ref
= g_new(unsigned int, nr_ring_ref
);
80 if (xen_device_frontend_scanf(xendev
, "ring-ref", "%u",
82 error_setg(errp
, "failed to read ring-ref");
86 } else if (order
<= blockdev
->props
.max_ring_page_order
) {
89 nr_ring_ref
= 1 << order
;
90 ring_ref
= g_new(unsigned int, nr_ring_ref
);
92 for (i
= 0; i
< nr_ring_ref
; i
++) {
93 const char *key
= g_strdup_printf("ring-ref%u", i
);
95 if (xen_device_frontend_scanf(xendev
, key
, "%u",
97 error_setg(errp
, "failed to read %s", key
);
98 g_free((gpointer
)key
);
103 g_free((gpointer
)key
);
106 error_setg(errp
, "invalid ring-page-order (%d)", order
);
110 if (xen_device_frontend_scanf(xendev
, "event-channel", "%u",
111 &event_channel
) != 1) {
112 error_setg(errp
, "failed to read event-channel");
117 if (xen_device_frontend_scanf(xendev
, "protocol", "%ms",
119 protocol
= BLKIF_PROTOCOL_NATIVE
;
121 if (strcmp(str
, XEN_IO_PROTO_ABI_X86_32
) == 0) {
122 protocol
= BLKIF_PROTOCOL_X86_32
;
123 } else if (strcmp(str
, XEN_IO_PROTO_ABI_X86_64
) == 0) {
124 protocol
= BLKIF_PROTOCOL_X86_64
;
126 protocol
= BLKIF_PROTOCOL_NATIVE
;
132 xen_block_dataplane_start(blockdev
->dataplane
, ring_ref
, nr_ring_ref
,
133 event_channel
, protocol
, errp
);
138 static void xen_block_unrealize(XenDevice
*xendev
, Error
**errp
)
140 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
141 XenBlockDeviceClass
*blockdev_class
=
142 XEN_BLOCK_DEVICE_GET_CLASS(xendev
);
143 const char *type
= object_get_typename(OBJECT(blockdev
));
144 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
146 if (vdev
->type
== XEN_BLOCK_VDEV_TYPE_INVALID
) {
150 trace_xen_block_unrealize(type
, vdev
->disk
, vdev
->partition
);
152 /* Disconnect from the frontend in case this has not already happened */
153 xen_block_disconnect(xendev
, NULL
);
155 xen_block_dataplane_destroy(blockdev
->dataplane
);
156 blockdev
->dataplane
= NULL
;
158 if (blockdev_class
->unrealize
) {
159 blockdev_class
->unrealize(blockdev
, errp
);
163 static void xen_block_set_size(XenBlockDevice
*blockdev
)
165 const char *type
= object_get_typename(OBJECT(blockdev
));
166 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
167 BlockConf
*conf
= &blockdev
->props
.conf
;
168 int64_t sectors
= blk_getlength(conf
->blk
) / conf
->logical_block_size
;
169 XenDevice
*xendev
= XEN_DEVICE(blockdev
);
171 trace_xen_block_size(type
, vdev
->disk
, vdev
->partition
, sectors
);
173 xen_device_backend_printf(xendev
, "sectors", "%"PRIi64
, sectors
);
176 static void xen_block_resize_cb(void *opaque
)
178 XenBlockDevice
*blockdev
= opaque
;
179 XenDevice
*xendev
= XEN_DEVICE(blockdev
);
180 enum xenbus_state state
= xen_device_backend_get_state(xendev
);
182 xen_block_set_size(blockdev
);
185 * Mimic the behaviour of Linux xen-blkback and re-write the state
186 * to trigger the frontend watch.
188 xen_device_backend_printf(xendev
, "state", "%u", state
);
191 static const BlockDevOps xen_block_dev_ops
= {
192 .resize_cb
= xen_block_resize_cb
,
195 static void xen_block_realize(XenDevice
*xendev
, Error
**errp
)
197 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
198 XenBlockDeviceClass
*blockdev_class
=
199 XEN_BLOCK_DEVICE_GET_CLASS(xendev
);
200 const char *type
= object_get_typename(OBJECT(blockdev
));
201 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
202 BlockConf
*conf
= &blockdev
->props
.conf
;
203 BlockBackend
*blk
= conf
->blk
;
204 Error
*local_err
= NULL
;
206 if (vdev
->type
== XEN_BLOCK_VDEV_TYPE_INVALID
) {
207 error_setg(errp
, "vdev property not set");
211 trace_xen_block_realize(type
, vdev
->disk
, vdev
->partition
);
213 if (blockdev_class
->realize
) {
214 blockdev_class
->realize(blockdev
, &local_err
);
216 error_propagate(errp
, local_err
);
222 * The blkif protocol does not deal with removable media, so it must
223 * always be present, even for CDRom devices.
226 if (!blk_is_inserted(blk
)) {
227 error_setg(errp
, "device needs media, but drive is empty");
231 if (!blkconf_apply_backend_options(conf
, blockdev
->info
& VDISK_READONLY
,
236 if (!(blockdev
->info
& VDISK_CDROM
) &&
237 !blkconf_geometry(conf
, NULL
, 65535, 255, 255, errp
)) {
241 blkconf_blocksizes(conf
);
243 if (conf
->logical_block_size
> conf
->physical_block_size
) {
245 errp
, "logical_block_size > physical_block_size not supported");
249 blk_set_dev_ops(blk
, &xen_block_dev_ops
, blockdev
);
250 blk_set_guest_block_size(blk
, conf
->logical_block_size
);
252 if (conf
->discard_granularity
== -1) {
253 conf
->discard_granularity
= conf
->physical_block_size
;
256 if (blk_get_flags(blk
) & BDRV_O_UNMAP
) {
257 xen_device_backend_printf(xendev
, "feature-discard", "%u", 1);
258 xen_device_backend_printf(xendev
, "discard-granularity", "%u",
259 conf
->discard_granularity
);
262 xen_device_backend_printf(xendev
, "feature-flush-cache", "%u", 1);
263 xen_device_backend_printf(xendev
, "max-ring-page-order", "%u",
264 blockdev
->props
.max_ring_page_order
);
265 xen_device_backend_printf(xendev
, "info", "%u", blockdev
->info
);
267 xen_device_frontend_printf(xendev
, "virtual-device", "%lu",
269 xen_device_frontend_printf(xendev
, "device-type", "%s",
270 blockdev
->device_type
);
272 xen_device_backend_printf(xendev
, "sector-size", "%u",
273 conf
->logical_block_size
);
275 xen_block_set_size(blockdev
);
277 blockdev
->dataplane
=
278 xen_block_dataplane_create(xendev
, blk
, conf
->logical_block_size
,
279 blockdev
->props
.iothread
);
282 static void xen_block_frontend_changed(XenDevice
*xendev
,
283 enum xenbus_state frontend_state
,
286 enum xenbus_state backend_state
= xen_device_backend_get_state(xendev
);
287 Error
*local_err
= NULL
;
289 switch (frontend_state
) {
290 case XenbusStateInitialised
:
291 case XenbusStateConnected
:
292 if (backend_state
== XenbusStateConnected
) {
296 xen_block_disconnect(xendev
, &local_err
);
298 error_propagate(errp
, local_err
);
302 xen_block_connect(xendev
, &local_err
);
304 error_propagate(errp
, local_err
);
308 xen_device_backend_set_state(xendev
, XenbusStateConnected
);
311 case XenbusStateClosing
:
312 xen_device_backend_set_state(xendev
, XenbusStateClosing
);
315 case XenbusStateClosed
:
316 case XenbusStateUnknown
:
317 xen_block_disconnect(xendev
, &local_err
);
319 error_propagate(errp
, local_err
);
323 xen_device_backend_set_state(xendev
, XenbusStateClosed
);
331 static char *disk_to_vbd_name(unsigned int disk
)
333 char *name
, *prefix
= (disk
>= 26) ?
334 disk_to_vbd_name((disk
/ 26) - 1) : g_strdup("");
336 name
= g_strdup_printf("%s%c", prefix
, 'a' + disk
% 26);
342 static void xen_block_get_vdev(Object
*obj
, Visitor
*v
, const char *name
,
343 void *opaque
, Error
**errp
)
345 DeviceState
*dev
= DEVICE(obj
);
346 Property
*prop
= opaque
;
347 XenBlockVdev
*vdev
= qdev_get_prop_ptr(dev
, prop
);
350 switch (vdev
->type
) {
351 case XEN_BLOCK_VDEV_TYPE_DP
:
352 str
= g_strdup_printf("d%lup%lu", vdev
->disk
, vdev
->partition
);
355 case XEN_BLOCK_VDEV_TYPE_XVD
:
356 case XEN_BLOCK_VDEV_TYPE_HD
:
357 case XEN_BLOCK_VDEV_TYPE_SD
: {
358 char *name
= disk_to_vbd_name(vdev
->disk
);
360 str
= g_strdup_printf("%s%s%lu",
361 (vdev
->type
== XEN_BLOCK_VDEV_TYPE_XVD
) ?
363 (vdev
->type
== XEN_BLOCK_VDEV_TYPE_HD
) ?
366 name
, vdev
->partition
);
371 error_setg(errp
, "invalid vdev type");
375 visit_type_str(v
, name
, &str
, errp
);
379 static int vbd_name_to_disk(const char *name
, const char **endp
,
384 while (*name
!= '\0') {
385 if (!g_ascii_isalpha(*name
) || !g_ascii_islower(*name
)) {
390 n
+= *name
++ - 'a' + 1;
403 static void xen_block_set_vdev(Object
*obj
, Visitor
*v
, const char *name
,
404 void *opaque
, Error
**errp
)
406 DeviceState
*dev
= DEVICE(obj
);
407 Property
*prop
= opaque
;
408 XenBlockVdev
*vdev
= qdev_get_prop_ptr(dev
, prop
);
409 Error
*local_err
= NULL
;
414 qdev_prop_set_after_realize(dev
, name
, errp
);
418 visit_type_str(v
, name
, &str
, &local_err
);
420 error_propagate(errp
, local_err
);
424 p
= strchr(str
, 'd');
431 vdev
->type
= XEN_BLOCK_VDEV_TYPE_DP
;
432 } else if (strcmp(str
, "xv") == 0) {
433 vdev
->type
= XEN_BLOCK_VDEV_TYPE_XVD
;
434 } else if (strcmp(str
, "h") == 0) {
435 vdev
->type
= XEN_BLOCK_VDEV_TYPE_HD
;
436 } else if (strcmp(str
, "s") == 0) {
437 vdev
->type
= XEN_BLOCK_VDEV_TYPE_SD
;
442 if (vdev
->type
== XEN_BLOCK_VDEV_TYPE_DP
) {
443 if (qemu_strtoul(p
, &end
, 10, &vdev
->disk
)) {
448 if (*(++end
) == '\0') {
453 if (vbd_name_to_disk(p
, &end
, &vdev
->disk
)) {
461 if (qemu_strtoul(p
, &end
, 10, &vdev
->partition
)) {
472 switch (vdev
->type
) {
473 case XEN_BLOCK_VDEV_TYPE_DP
:
474 case XEN_BLOCK_VDEV_TYPE_XVD
:
475 if (vdev
->disk
< (1 << 4) && vdev
->partition
< (1 << 4)) {
476 vdev
->number
= (202 << 8) | (vdev
->disk
<< 4) |
478 } else if (vdev
->disk
< (1 << 20) && vdev
->partition
< (1 << 8)) {
479 vdev
->number
= (1 << 28) | (vdev
->disk
<< 8) |
486 case XEN_BLOCK_VDEV_TYPE_HD
:
487 if ((vdev
->disk
== 0 || vdev
->disk
== 1) &&
488 vdev
->partition
< (1 << 6)) {
489 vdev
->number
= (3 << 8) | (vdev
->disk
<< 6) | vdev
->partition
;
490 } else if ((vdev
->disk
== 2 || vdev
->disk
== 3) &&
491 vdev
->partition
< (1 << 6)) {
492 vdev
->number
= (22 << 8) | ((vdev
->disk
- 2) << 6) |
499 case XEN_BLOCK_VDEV_TYPE_SD
:
500 if (vdev
->disk
< (1 << 4) && vdev
->partition
< (1 << 4)) {
501 vdev
->number
= (8 << 8) | (vdev
->disk
<< 4) | vdev
->partition
;
515 error_setg(errp
, "invalid virtual disk specifier");
517 vdev
->type
= XEN_BLOCK_VDEV_TYPE_INVALID
;
522 * This property deals with 'vdev' names adhering to the Xen VBD naming
523 * scheme described in:
525 * https://xenbits.xen.org/docs/unstable/man/xen-vbd-interface.7.html
527 const PropertyInfo xen_block_prop_vdev
= {
529 .description
= "Virtual Disk specifier: d*p*/xvd*/hd*/sd*",
530 .get
= xen_block_get_vdev
,
531 .set
= xen_block_set_vdev
,
534 static Property xen_block_props
[] = {
535 DEFINE_PROP("vdev", XenBlockDevice
, props
.vdev
,
536 xen_block_prop_vdev
, XenBlockVdev
),
537 DEFINE_BLOCK_PROPERTIES(XenBlockDevice
, props
.conf
),
538 DEFINE_PROP_UINT32("max-ring-page-order", XenBlockDevice
,
539 props
.max_ring_page_order
, 4),
540 DEFINE_PROP_LINK("iothread", XenBlockDevice
, props
.iothread
,
541 TYPE_IOTHREAD
, IOThread
*),
542 DEFINE_PROP_END_OF_LIST()
545 static void xen_block_class_init(ObjectClass
*class, void *data
)
547 DeviceClass
*dev_class
= DEVICE_CLASS(class);
548 XenDeviceClass
*xendev_class
= XEN_DEVICE_CLASS(class);
550 xendev_class
->backend
= "qdisk";
551 xendev_class
->device
= "vbd";
552 xendev_class
->get_name
= xen_block_get_name
;
553 xendev_class
->realize
= xen_block_realize
;
554 xendev_class
->frontend_changed
= xen_block_frontend_changed
;
555 xendev_class
->unrealize
= xen_block_unrealize
;
557 dev_class
->props
= xen_block_props
;
560 static const TypeInfo xen_block_type_info
= {
561 .name
= TYPE_XEN_BLOCK_DEVICE
,
562 .parent
= TYPE_XEN_DEVICE
,
563 .instance_size
= sizeof(XenBlockDevice
),
565 .class_size
= sizeof(XenBlockDeviceClass
),
566 .class_init
= xen_block_class_init
,
569 static void xen_disk_unrealize(XenBlockDevice
*blockdev
, Error
**errp
)
571 trace_xen_disk_unrealize();
574 static void xen_disk_realize(XenBlockDevice
*blockdev
, Error
**errp
)
576 BlockConf
*conf
= &blockdev
->props
.conf
;
578 trace_xen_disk_realize();
580 blockdev
->device_type
= "disk";
583 error_setg(errp
, "drive property not set");
587 blockdev
->info
= blk_is_read_only(conf
->blk
) ? VDISK_READONLY
: 0;
590 static void xen_disk_class_init(ObjectClass
*class, void *data
)
592 DeviceClass
*dev_class
= DEVICE_CLASS(class);
593 XenBlockDeviceClass
*blockdev_class
= XEN_BLOCK_DEVICE_CLASS(class);
595 blockdev_class
->realize
= xen_disk_realize
;
596 blockdev_class
->unrealize
= xen_disk_unrealize
;
598 dev_class
->desc
= "Xen Disk Device";
601 static const TypeInfo xen_disk_type_info
= {
602 .name
= TYPE_XEN_DISK_DEVICE
,
603 .parent
= TYPE_XEN_BLOCK_DEVICE
,
604 .instance_size
= sizeof(XenDiskDevice
),
605 .class_init
= xen_disk_class_init
,
608 static void xen_cdrom_unrealize(XenBlockDevice
*blockdev
, Error
**errp
)
610 trace_xen_cdrom_unrealize();
613 static void xen_cdrom_realize(XenBlockDevice
*blockdev
, Error
**errp
)
615 BlockConf
*conf
= &blockdev
->props
.conf
;
617 trace_xen_cdrom_realize();
619 blockdev
->device_type
= "cdrom";
624 /* Set up an empty drive */
625 conf
->blk
= blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL
);
627 rc
= blk_attach_dev(conf
->blk
, DEVICE(blockdev
));
629 error_setg_errno(errp
, -rc
, "failed to create drive");
634 blockdev
->info
= VDISK_READONLY
| VDISK_CDROM
;
637 static void xen_cdrom_class_init(ObjectClass
*class, void *data
)
639 DeviceClass
*dev_class
= DEVICE_CLASS(class);
640 XenBlockDeviceClass
*blockdev_class
= XEN_BLOCK_DEVICE_CLASS(class);
642 blockdev_class
->realize
= xen_cdrom_realize
;
643 blockdev_class
->unrealize
= xen_cdrom_unrealize
;
645 dev_class
->desc
= "Xen CD-ROM Device";
648 static const TypeInfo xen_cdrom_type_info
= {
649 .name
= TYPE_XEN_CDROM_DEVICE
,
650 .parent
= TYPE_XEN_BLOCK_DEVICE
,
651 .instance_size
= sizeof(XenCDRomDevice
),
652 .class_init
= xen_cdrom_class_init
,
655 static void xen_block_register_types(void)
657 type_register_static(&xen_block_type_info
);
658 type_register_static(&xen_disk_type_info
);
659 type_register_static(&xen_cdrom_type_info
);
662 type_init(xen_block_register_types
)
664 static void xen_block_blockdev_del(const char *node_name
, Error
**errp
)
666 trace_xen_block_blockdev_del(node_name
);
668 qmp_blockdev_del(node_name
, errp
);
671 static char *xen_block_blockdev_add(const char *id
, QDict
*qdict
,
674 const char *driver
= qdict_get_try_str(qdict
, "driver");
675 BlockdevOptions
*options
= NULL
;
676 Error
*local_err
= NULL
;
681 error_setg(errp
, "no 'driver' parameter");
685 node_name
= g_strdup_printf("%s-%s", id
, driver
);
686 qdict_put_str(qdict
, "node-name", node_name
);
688 trace_xen_block_blockdev_add(node_name
);
690 v
= qobject_input_visitor_new(QOBJECT(qdict
));
691 visit_type_BlockdevOptions(v
, NULL
, &options
, &local_err
);
695 error_propagate(errp
, local_err
);
699 qmp_blockdev_add(options
, &local_err
);
702 error_propagate(errp
, local_err
);
706 qapi_free_BlockdevOptions(options
);
712 qapi_free_BlockdevOptions(options
);
719 static void xen_block_drive_destroy(XenBlockDrive
*drive
, Error
**errp
)
721 char *node_name
= drive
->node_name
;
724 Error
*local_err
= NULL
;
726 xen_block_blockdev_del(node_name
, &local_err
);
728 error_propagate(errp
, local_err
);
732 drive
->node_name
= NULL
;
738 static XenBlockDrive
*xen_block_drive_create(const char *id
,
739 const char *device_type
,
740 QDict
*opts
, Error
**errp
)
742 const char *params
= qdict_get_try_str(opts
, "params");
743 const char *mode
= qdict_get_try_str(opts
, "mode");
744 const char *direct_io_safe
= qdict_get_try_str(opts
, "direct-io-safe");
745 const char *discard_enable
= qdict_get_try_str(opts
, "discard-enable");
747 char *filename
= NULL
;
748 XenBlockDrive
*drive
= NULL
;
749 Error
*local_err
= NULL
;
754 char **v
= g_strsplit(params
, ":", 2);
757 filename
= g_strdup(v
[0]);
758 driver
= g_strdup("raw");
760 if (strcmp(v
[0], "aio") == 0) {
761 driver
= g_strdup("raw");
762 } else if (strcmp(v
[0], "vhd") == 0) {
763 driver
= g_strdup("vpc");
765 driver
= g_strdup(v
[0]);
767 filename
= g_strdup(v
[1]);
772 error_setg(errp
, "no params");
779 drive
= g_new0(XenBlockDrive
, 1);
780 drive
->id
= g_strdup(id
);
782 file_layer
= qdict_new();
783 driver_layer
= qdict_new();
785 qdict_put_str(file_layer
, "driver", "file");
786 qdict_put_str(file_layer
, "filename", filename
);
789 if (mode
&& *mode
!= 'w') {
790 qdict_put_bool(file_layer
, "read-only", true);
793 if (direct_io_safe
) {
796 if (!qemu_strtoul(direct_io_safe
, NULL
, 2, &value
) && !!value
) {
797 QDict
*cache_qdict
= qdict_new();
799 qdict_put_bool(cache_qdict
, "direct", true);
800 qdict_put(file_layer
, "cache", cache_qdict
);
802 qdict_put_str(file_layer
, "aio", "native");
806 if (discard_enable
) {
809 if (!qemu_strtoul(discard_enable
, NULL
, 2, &value
) && !!value
) {
810 qdict_put_str(file_layer
, "discard", "unmap");
811 qdict_put_str(driver_layer
, "discard", "unmap");
816 * It is necessary to turn file locking off as an emulated device
817 * may have already opened the same image file.
819 qdict_put_str(file_layer
, "locking", "off");
821 qdict_put_str(driver_layer
, "driver", driver
);
824 qdict_put(driver_layer
, "file", file_layer
);
826 g_assert(!drive
->node_name
);
827 drive
->node_name
= xen_block_blockdev_add(drive
->id
, driver_layer
,
830 qobject_unref(driver_layer
);
834 error_propagate(errp
, local_err
);
835 xen_block_drive_destroy(drive
, NULL
);
842 static const char *xen_block_drive_get_node_name(XenBlockDrive
*drive
)
844 return drive
->node_name
? drive
->node_name
: "";
847 static void xen_block_iothread_destroy(XenBlockIOThread
*iothread
,
850 qmp_object_del(iothread
->id
, errp
);
852 g_free(iothread
->id
);
856 static XenBlockIOThread
*xen_block_iothread_create(const char *id
,
859 XenBlockIOThread
*iothread
= g_new(XenBlockIOThread
, 1);
860 Error
*local_err
= NULL
;
862 iothread
->id
= g_strdup(id
);
864 qmp_object_add(TYPE_IOTHREAD
, id
, false, NULL
, &local_err
);
866 error_propagate(errp
, local_err
);
868 g_free(iothread
->id
);
876 static void xen_block_device_create(XenBackendInstance
*backend
,
877 QDict
*opts
, Error
**errp
)
879 XenBus
*xenbus
= xen_backend_get_bus(backend
);
880 const char *name
= xen_backend_get_name(backend
);
881 unsigned long number
;
882 const char *vdev
, *device_type
;
883 XenBlockDrive
*drive
= NULL
;
884 XenBlockIOThread
*iothread
= NULL
;
885 XenDevice
*xendev
= NULL
;
886 Error
*local_err
= NULL
;
888 XenBlockDevice
*blockdev
;
890 if (qemu_strtoul(name
, NULL
, 10, &number
)) {
891 error_setg(errp
, "failed to parse name '%s'", name
);
895 trace_xen_block_device_create(number
);
897 vdev
= qdict_get_try_str(opts
, "dev");
899 error_setg(errp
, "no dev parameter");
903 device_type
= qdict_get_try_str(opts
, "device-type");
905 error_setg(errp
, "no device-type parameter");
909 if (!strcmp(device_type
, "disk")) {
910 type
= TYPE_XEN_DISK_DEVICE
;
911 } else if (!strcmp(device_type
, "cdrom")) {
912 type
= TYPE_XEN_CDROM_DEVICE
;
914 error_setg(errp
, "invalid device-type parameter '%s'", device_type
);
918 drive
= xen_block_drive_create(vdev
, device_type
, opts
, &local_err
);
920 error_propagate_prepend(errp
, local_err
, "failed to create drive: ");
924 iothread
= xen_block_iothread_create(vdev
, &local_err
);
926 error_propagate_prepend(errp
, local_err
,
927 "failed to create iothread: ");
931 xendev
= XEN_DEVICE(qdev_create(BUS(xenbus
), type
));
932 blockdev
= XEN_BLOCK_DEVICE(xendev
);
934 object_property_set_str(OBJECT(xendev
), vdev
, "vdev", &local_err
);
936 error_propagate_prepend(errp
, local_err
, "failed to set 'vdev': ");
940 object_property_set_str(OBJECT(xendev
),
941 xen_block_drive_get_node_name(drive
), "drive",
944 error_propagate_prepend(errp
, local_err
, "failed to set 'drive': ");
948 object_property_set_str(OBJECT(xendev
), iothread
->id
, "iothread",
951 error_propagate_prepend(errp
, local_err
,
952 "failed to set 'iothread': ");
956 blockdev
->iothread
= iothread
;
957 blockdev
->drive
= drive
;
959 object_property_set_bool(OBJECT(xendev
), true, "realized", &local_err
);
961 error_propagate_prepend(errp
, local_err
,
962 "realization of device %s failed: ",
967 xen_backend_set_device(backend
, xendev
);
972 object_unparent(OBJECT(xendev
));
976 xen_block_iothread_destroy(iothread
, NULL
);
980 xen_block_drive_destroy(drive
, NULL
);
984 static void xen_block_device_destroy(XenBackendInstance
*backend
,
987 XenDevice
*xendev
= xen_backend_get_device(backend
);
988 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
989 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
990 XenBlockDrive
*drive
= blockdev
->drive
;
991 XenBlockIOThread
*iothread
= blockdev
->iothread
;
993 trace_xen_block_device_destroy(vdev
->number
);
995 object_unparent(OBJECT(xendev
));
998 Error
*local_err
= NULL
;
1000 xen_block_iothread_destroy(iothread
, &local_err
);
1002 error_propagate_prepend(errp
, local_err
,
1003 "failed to destroy iothread: ");
1009 Error
*local_err
= NULL
;
1011 xen_block_drive_destroy(drive
, &local_err
);
1013 error_propagate_prepend(errp
, local_err
,
1014 "failed to destroy drive: ");
1019 static const XenBackendInfo xen_block_backend_info
= {
1021 .create
= xen_block_device_create
,
1022 .destroy
= xen_block_device_destroy
,
1025 static void xen_block_register_backend(void)
1027 xen_backend_register(&xen_block_backend_info
);
1030 xen_backend_init(xen_block_register_backend
);