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 "qom/object_interfaces.h"
22 #include "hw/xen/xen_common.h"
23 #include "hw/block/xen_blkif.h"
24 #include "hw/qdev-properties.h"
25 #include "hw/xen/xen-block.h"
26 #include "hw/xen/xen-backend.h"
27 #include "sysemu/blockdev.h"
28 #include "sysemu/block-backend.h"
29 #include "sysemu/iothread.h"
30 #include "dataplane/xen-block.h"
33 static char *xen_block_get_name(XenDevice
*xendev
, Error
**errp
)
35 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
36 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
38 return g_strdup_printf("%lu", vdev
->number
);
41 static void xen_block_disconnect(XenDevice
*xendev
, Error
**errp
)
43 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
44 const char *type
= object_get_typename(OBJECT(blockdev
));
45 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
47 trace_xen_block_disconnect(type
, vdev
->disk
, vdev
->partition
);
49 xen_block_dataplane_stop(blockdev
->dataplane
);
52 static void xen_block_connect(XenDevice
*xendev
, Error
**errp
)
54 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
55 const char *type
= object_get_typename(OBJECT(blockdev
));
56 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
57 BlockConf
*conf
= &blockdev
->props
.conf
;
58 unsigned int feature_large_sector_size
;
59 unsigned int order
, nr_ring_ref
, *ring_ref
, event_channel
, protocol
;
62 trace_xen_block_connect(type
, vdev
->disk
, vdev
->partition
);
64 if (xen_device_frontend_scanf(xendev
, "feature-large-sector-size", "%u",
65 &feature_large_sector_size
) != 1) {
66 feature_large_sector_size
= 0;
69 if (feature_large_sector_size
!= 1 &&
70 conf
->logical_block_size
!= XEN_BLKIF_SECTOR_SIZE
) {
71 error_setg(errp
, "logical_block_size != %u not supported by frontend",
72 XEN_BLKIF_SECTOR_SIZE
);
76 if (xen_device_frontend_scanf(xendev
, "ring-page-order", "%u",
79 ring_ref
= g_new(unsigned int, nr_ring_ref
);
81 if (xen_device_frontend_scanf(xendev
, "ring-ref", "%u",
83 error_setg(errp
, "failed to read ring-ref");
87 } else if (order
<= blockdev
->props
.max_ring_page_order
) {
90 nr_ring_ref
= 1 << order
;
91 ring_ref
= g_new(unsigned int, nr_ring_ref
);
93 for (i
= 0; i
< nr_ring_ref
; i
++) {
94 const char *key
= g_strdup_printf("ring-ref%u", i
);
96 if (xen_device_frontend_scanf(xendev
, key
, "%u",
98 error_setg(errp
, "failed to read %s", key
);
99 g_free((gpointer
)key
);
104 g_free((gpointer
)key
);
107 error_setg(errp
, "invalid ring-page-order (%d)", order
);
111 if (xen_device_frontend_scanf(xendev
, "event-channel", "%u",
112 &event_channel
) != 1) {
113 error_setg(errp
, "failed to read event-channel");
118 if (xen_device_frontend_scanf(xendev
, "protocol", "%ms",
120 protocol
= BLKIF_PROTOCOL_NATIVE
;
122 if (strcmp(str
, XEN_IO_PROTO_ABI_X86_32
) == 0) {
123 protocol
= BLKIF_PROTOCOL_X86_32
;
124 } else if (strcmp(str
, XEN_IO_PROTO_ABI_X86_64
) == 0) {
125 protocol
= BLKIF_PROTOCOL_X86_64
;
127 protocol
= BLKIF_PROTOCOL_NATIVE
;
133 xen_block_dataplane_start(blockdev
->dataplane
, ring_ref
, nr_ring_ref
,
134 event_channel
, protocol
, errp
);
139 static void xen_block_unrealize(XenDevice
*xendev
)
141 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
142 XenBlockDeviceClass
*blockdev_class
=
143 XEN_BLOCK_DEVICE_GET_CLASS(xendev
);
144 const char *type
= object_get_typename(OBJECT(blockdev
));
145 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
147 if (vdev
->type
== XEN_BLOCK_VDEV_TYPE_INVALID
) {
151 trace_xen_block_unrealize(type
, vdev
->disk
, vdev
->partition
);
153 /* Disconnect from the frontend in case this has not already happened */
154 xen_block_disconnect(xendev
, NULL
);
156 xen_block_dataplane_destroy(blockdev
->dataplane
);
157 blockdev
->dataplane
= NULL
;
159 if (blockdev_class
->unrealize
) {
160 blockdev_class
->unrealize(blockdev
);
164 static void xen_block_set_size(XenBlockDevice
*blockdev
)
166 const char *type
= object_get_typename(OBJECT(blockdev
));
167 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
168 BlockConf
*conf
= &blockdev
->props
.conf
;
169 int64_t sectors
= blk_getlength(conf
->blk
) / conf
->logical_block_size
;
170 XenDevice
*xendev
= XEN_DEVICE(blockdev
);
172 trace_xen_block_size(type
, vdev
->disk
, vdev
->partition
, sectors
);
174 xen_device_backend_printf(xendev
, "sectors", "%"PRIi64
, sectors
);
177 static void xen_block_resize_cb(void *opaque
)
179 XenBlockDevice
*blockdev
= opaque
;
180 XenDevice
*xendev
= XEN_DEVICE(blockdev
);
181 enum xenbus_state state
= xen_device_backend_get_state(xendev
);
183 xen_block_set_size(blockdev
);
186 * Mimic the behaviour of Linux xen-blkback and re-write the state
187 * to trigger the frontend watch.
189 xen_device_backend_printf(xendev
, "state", "%u", state
);
192 static const BlockDevOps xen_block_dev_ops
= {
193 .resize_cb
= xen_block_resize_cb
,
196 static void xen_block_realize(XenDevice
*xendev
, Error
**errp
)
198 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
199 XenBlockDeviceClass
*blockdev_class
=
200 XEN_BLOCK_DEVICE_GET_CLASS(xendev
);
201 const char *type
= object_get_typename(OBJECT(blockdev
));
202 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
203 BlockConf
*conf
= &blockdev
->props
.conf
;
204 BlockBackend
*blk
= conf
->blk
;
205 Error
*local_err
= NULL
;
207 if (vdev
->type
== XEN_BLOCK_VDEV_TYPE_INVALID
) {
208 error_setg(errp
, "vdev property not set");
212 trace_xen_block_realize(type
, vdev
->disk
, vdev
->partition
);
214 if (blockdev_class
->realize
) {
215 blockdev_class
->realize(blockdev
, &local_err
);
217 error_propagate(errp
, local_err
);
223 * The blkif protocol does not deal with removable media, so it must
224 * always be present, even for CDRom devices.
227 if (!blk_is_inserted(blk
)) {
228 error_setg(errp
, "device needs media, but drive is empty");
232 if (!blkconf_apply_backend_options(conf
, blockdev
->info
& VDISK_READONLY
,
237 if (!(blockdev
->info
& VDISK_CDROM
) &&
238 !blkconf_geometry(conf
, NULL
, 65535, 255, 255, errp
)) {
242 if (!blkconf_blocksizes(conf
, errp
)) {
246 blk_set_dev_ops(blk
, &xen_block_dev_ops
, blockdev
);
247 blk_set_guest_block_size(blk
, conf
->logical_block_size
);
249 if (conf
->discard_granularity
== -1) {
250 conf
->discard_granularity
= conf
->physical_block_size
;
253 if (blk_get_flags(blk
) & BDRV_O_UNMAP
) {
254 xen_device_backend_printf(xendev
, "feature-discard", "%u", 1);
255 xen_device_backend_printf(xendev
, "discard-granularity", "%u",
256 conf
->discard_granularity
);
259 xen_device_backend_printf(xendev
, "feature-flush-cache", "%u", 1);
260 xen_device_backend_printf(xendev
, "max-ring-page-order", "%u",
261 blockdev
->props
.max_ring_page_order
);
262 xen_device_backend_printf(xendev
, "info", "%u", blockdev
->info
);
264 xen_device_frontend_printf(xendev
, "virtual-device", "%lu",
266 xen_device_frontend_printf(xendev
, "device-type", "%s",
267 blockdev
->device_type
);
269 xen_device_backend_printf(xendev
, "sector-size", "%u",
270 conf
->logical_block_size
);
272 xen_block_set_size(blockdev
);
274 blockdev
->dataplane
=
275 xen_block_dataplane_create(xendev
, blk
, conf
->logical_block_size
,
276 blockdev
->props
.iothread
);
279 static void xen_block_frontend_changed(XenDevice
*xendev
,
280 enum xenbus_state frontend_state
,
283 enum xenbus_state backend_state
= xen_device_backend_get_state(xendev
);
284 Error
*local_err
= NULL
;
286 switch (frontend_state
) {
287 case XenbusStateInitialised
:
288 case XenbusStateConnected
:
289 if (backend_state
== XenbusStateConnected
) {
293 xen_block_disconnect(xendev
, &local_err
);
295 error_propagate(errp
, local_err
);
299 xen_block_connect(xendev
, &local_err
);
301 error_propagate(errp
, local_err
);
305 xen_device_backend_set_state(xendev
, XenbusStateConnected
);
308 case XenbusStateClosing
:
309 xen_device_backend_set_state(xendev
, XenbusStateClosing
);
312 case XenbusStateClosed
:
313 case XenbusStateUnknown
:
314 xen_block_disconnect(xendev
, &local_err
);
316 error_propagate(errp
, local_err
);
320 xen_device_backend_set_state(xendev
, XenbusStateClosed
);
328 static char *disk_to_vbd_name(unsigned int disk
)
330 char *name
, *prefix
= (disk
>= 26) ?
331 disk_to_vbd_name((disk
/ 26) - 1) : g_strdup("");
333 name
= g_strdup_printf("%s%c", prefix
, 'a' + disk
% 26);
339 static void xen_block_get_vdev(Object
*obj
, Visitor
*v
, const char *name
,
340 void *opaque
, Error
**errp
)
342 DeviceState
*dev
= DEVICE(obj
);
343 Property
*prop
= opaque
;
344 XenBlockVdev
*vdev
= qdev_get_prop_ptr(dev
, prop
);
347 switch (vdev
->type
) {
348 case XEN_BLOCK_VDEV_TYPE_DP
:
349 str
= g_strdup_printf("d%lup%lu", vdev
->disk
, vdev
->partition
);
352 case XEN_BLOCK_VDEV_TYPE_XVD
:
353 case XEN_BLOCK_VDEV_TYPE_HD
:
354 case XEN_BLOCK_VDEV_TYPE_SD
: {
355 char *name
= disk_to_vbd_name(vdev
->disk
);
357 str
= g_strdup_printf("%s%s%lu",
358 (vdev
->type
== XEN_BLOCK_VDEV_TYPE_XVD
) ?
360 (vdev
->type
== XEN_BLOCK_VDEV_TYPE_HD
) ?
363 name
, vdev
->partition
);
368 error_setg(errp
, "invalid vdev type");
372 visit_type_str(v
, name
, &str
, errp
);
376 static int vbd_name_to_disk(const char *name
, const char **endp
,
381 while (*name
!= '\0') {
382 if (!g_ascii_isalpha(*name
) || !g_ascii_islower(*name
)) {
387 n
+= *name
++ - 'a' + 1;
400 static void xen_block_set_vdev(Object
*obj
, Visitor
*v
, const char *name
,
401 void *opaque
, Error
**errp
)
403 DeviceState
*dev
= DEVICE(obj
);
404 Property
*prop
= opaque
;
405 XenBlockVdev
*vdev
= qdev_get_prop_ptr(dev
, prop
);
406 Error
*local_err
= NULL
;
411 qdev_prop_set_after_realize(dev
, name
, errp
);
415 if (!visit_type_str(v
, name
, &str
, &local_err
)) {
416 error_propagate(errp
, local_err
);
420 p
= strchr(str
, 'd');
427 vdev
->type
= XEN_BLOCK_VDEV_TYPE_DP
;
428 } else if (strcmp(str
, "xv") == 0) {
429 vdev
->type
= XEN_BLOCK_VDEV_TYPE_XVD
;
430 } else if (strcmp(str
, "h") == 0) {
431 vdev
->type
= XEN_BLOCK_VDEV_TYPE_HD
;
432 } else if (strcmp(str
, "s") == 0) {
433 vdev
->type
= XEN_BLOCK_VDEV_TYPE_SD
;
438 if (vdev
->type
== XEN_BLOCK_VDEV_TYPE_DP
) {
439 if (qemu_strtoul(p
, &end
, 10, &vdev
->disk
)) {
444 if (*(++end
) == '\0') {
449 if (vbd_name_to_disk(p
, &end
, &vdev
->disk
)) {
457 if (qemu_strtoul(p
, &end
, 10, &vdev
->partition
)) {
468 switch (vdev
->type
) {
469 case XEN_BLOCK_VDEV_TYPE_DP
:
470 case XEN_BLOCK_VDEV_TYPE_XVD
:
471 if (vdev
->disk
< (1 << 4) && vdev
->partition
< (1 << 4)) {
472 vdev
->number
= (202 << 8) | (vdev
->disk
<< 4) |
474 } else if (vdev
->disk
< (1 << 20) && vdev
->partition
< (1 << 8)) {
475 vdev
->number
= (1 << 28) | (vdev
->disk
<< 8) |
482 case XEN_BLOCK_VDEV_TYPE_HD
:
483 if ((vdev
->disk
== 0 || vdev
->disk
== 1) &&
484 vdev
->partition
< (1 << 6)) {
485 vdev
->number
= (3 << 8) | (vdev
->disk
<< 6) | vdev
->partition
;
486 } else if ((vdev
->disk
== 2 || vdev
->disk
== 3) &&
487 vdev
->partition
< (1 << 6)) {
488 vdev
->number
= (22 << 8) | ((vdev
->disk
- 2) << 6) |
495 case XEN_BLOCK_VDEV_TYPE_SD
:
496 if (vdev
->disk
< (1 << 4) && vdev
->partition
< (1 << 4)) {
497 vdev
->number
= (8 << 8) | (vdev
->disk
<< 4) | vdev
->partition
;
511 error_setg(errp
, "invalid virtual disk specifier");
513 vdev
->type
= XEN_BLOCK_VDEV_TYPE_INVALID
;
518 * This property deals with 'vdev' names adhering to the Xen VBD naming
519 * scheme described in:
521 * https://xenbits.xen.org/docs/unstable/man/xen-vbd-interface.7.html
523 const PropertyInfo xen_block_prop_vdev
= {
525 .description
= "Virtual Disk specifier: d*p*/xvd*/hd*/sd*",
526 .get
= xen_block_get_vdev
,
527 .set
= xen_block_set_vdev
,
530 static Property xen_block_props
[] = {
531 DEFINE_PROP("vdev", XenBlockDevice
, props
.vdev
,
532 xen_block_prop_vdev
, XenBlockVdev
),
533 DEFINE_BLOCK_PROPERTIES(XenBlockDevice
, props
.conf
),
534 DEFINE_PROP_UINT32("max-ring-page-order", XenBlockDevice
,
535 props
.max_ring_page_order
, 4),
536 DEFINE_PROP_LINK("iothread", XenBlockDevice
, props
.iothread
,
537 TYPE_IOTHREAD
, IOThread
*),
538 DEFINE_PROP_END_OF_LIST()
541 static void xen_block_class_init(ObjectClass
*class, void *data
)
543 DeviceClass
*dev_class
= DEVICE_CLASS(class);
544 XenDeviceClass
*xendev_class
= XEN_DEVICE_CLASS(class);
546 xendev_class
->backend
= "qdisk";
547 xendev_class
->device
= "vbd";
548 xendev_class
->get_name
= xen_block_get_name
;
549 xendev_class
->realize
= xen_block_realize
;
550 xendev_class
->frontend_changed
= xen_block_frontend_changed
;
551 xendev_class
->unrealize
= xen_block_unrealize
;
553 device_class_set_props(dev_class
, xen_block_props
);
556 static const TypeInfo xen_block_type_info
= {
557 .name
= TYPE_XEN_BLOCK_DEVICE
,
558 .parent
= TYPE_XEN_DEVICE
,
559 .instance_size
= sizeof(XenBlockDevice
),
561 .class_size
= sizeof(XenBlockDeviceClass
),
562 .class_init
= xen_block_class_init
,
565 static void xen_disk_unrealize(XenBlockDevice
*blockdev
)
567 trace_xen_disk_unrealize();
570 static void xen_disk_realize(XenBlockDevice
*blockdev
, Error
**errp
)
572 BlockConf
*conf
= &blockdev
->props
.conf
;
574 trace_xen_disk_realize();
576 blockdev
->device_type
= "disk";
579 error_setg(errp
, "drive property not set");
583 blockdev
->info
= blk_is_read_only(conf
->blk
) ? VDISK_READONLY
: 0;
586 static void xen_disk_class_init(ObjectClass
*class, void *data
)
588 DeviceClass
*dev_class
= DEVICE_CLASS(class);
589 XenBlockDeviceClass
*blockdev_class
= XEN_BLOCK_DEVICE_CLASS(class);
591 blockdev_class
->realize
= xen_disk_realize
;
592 blockdev_class
->unrealize
= xen_disk_unrealize
;
594 dev_class
->desc
= "Xen Disk Device";
597 static const TypeInfo xen_disk_type_info
= {
598 .name
= TYPE_XEN_DISK_DEVICE
,
599 .parent
= TYPE_XEN_BLOCK_DEVICE
,
600 .instance_size
= sizeof(XenDiskDevice
),
601 .class_init
= xen_disk_class_init
,
604 static void xen_cdrom_unrealize(XenBlockDevice
*blockdev
)
606 trace_xen_cdrom_unrealize();
609 static void xen_cdrom_realize(XenBlockDevice
*blockdev
, Error
**errp
)
611 BlockConf
*conf
= &blockdev
->props
.conf
;
613 trace_xen_cdrom_realize();
615 blockdev
->device_type
= "cdrom";
620 /* Set up an empty drive */
621 conf
->blk
= blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL
);
623 rc
= blk_attach_dev(conf
->blk
, DEVICE(blockdev
));
625 error_setg_errno(errp
, -rc
, "failed to create drive");
630 blockdev
->info
= VDISK_READONLY
| VDISK_CDROM
;
633 static void xen_cdrom_class_init(ObjectClass
*class, void *data
)
635 DeviceClass
*dev_class
= DEVICE_CLASS(class);
636 XenBlockDeviceClass
*blockdev_class
= XEN_BLOCK_DEVICE_CLASS(class);
638 blockdev_class
->realize
= xen_cdrom_realize
;
639 blockdev_class
->unrealize
= xen_cdrom_unrealize
;
641 dev_class
->desc
= "Xen CD-ROM Device";
644 static const TypeInfo xen_cdrom_type_info
= {
645 .name
= TYPE_XEN_CDROM_DEVICE
,
646 .parent
= TYPE_XEN_BLOCK_DEVICE
,
647 .instance_size
= sizeof(XenCDRomDevice
),
648 .class_init
= xen_cdrom_class_init
,
651 static void xen_block_register_types(void)
653 type_register_static(&xen_block_type_info
);
654 type_register_static(&xen_disk_type_info
);
655 type_register_static(&xen_cdrom_type_info
);
658 type_init(xen_block_register_types
)
660 static void xen_block_blockdev_del(const char *node_name
, Error
**errp
)
662 trace_xen_block_blockdev_del(node_name
);
664 qmp_blockdev_del(node_name
, errp
);
667 static char *xen_block_blockdev_add(const char *id
, QDict
*qdict
,
670 const char *driver
= qdict_get_try_str(qdict
, "driver");
671 BlockdevOptions
*options
= NULL
;
672 Error
*local_err
= NULL
;
677 error_setg(errp
, "no 'driver' parameter");
681 node_name
= g_strdup_printf("%s-%s", id
, driver
);
682 qdict_put_str(qdict
, "node-name", node_name
);
684 trace_xen_block_blockdev_add(node_name
);
686 v
= qobject_input_visitor_new(QOBJECT(qdict
));
687 visit_type_BlockdevOptions(v
, NULL
, &options
, &local_err
);
691 error_propagate(errp
, local_err
);
695 qmp_blockdev_add(options
, &local_err
);
698 error_propagate(errp
, local_err
);
702 qapi_free_BlockdevOptions(options
);
708 qapi_free_BlockdevOptions(options
);
715 static void xen_block_drive_destroy(XenBlockDrive
*drive
, Error
**errp
)
717 char *node_name
= drive
->node_name
;
720 Error
*local_err
= NULL
;
722 xen_block_blockdev_del(node_name
, &local_err
);
724 error_propagate(errp
, local_err
);
728 drive
->node_name
= NULL
;
734 static XenBlockDrive
*xen_block_drive_create(const char *id
,
735 const char *device_type
,
736 QDict
*opts
, Error
**errp
)
738 const char *params
= qdict_get_try_str(opts
, "params");
739 const char *mode
= qdict_get_try_str(opts
, "mode");
740 const char *direct_io_safe
= qdict_get_try_str(opts
, "direct-io-safe");
741 const char *discard_enable
= qdict_get_try_str(opts
, "discard-enable");
743 char *filename
= NULL
;
744 XenBlockDrive
*drive
= NULL
;
745 Error
*local_err
= NULL
;
750 char **v
= g_strsplit(params
, ":", 2);
753 filename
= g_strdup(v
[0]);
754 driver
= g_strdup("raw");
756 if (strcmp(v
[0], "aio") == 0) {
757 driver
= g_strdup("raw");
758 } else if (strcmp(v
[0], "vhd") == 0) {
759 driver
= g_strdup("vpc");
761 driver
= g_strdup(v
[0]);
763 filename
= g_strdup(v
[1]);
768 error_setg(errp
, "no params");
775 drive
= g_new0(XenBlockDrive
, 1);
776 drive
->id
= g_strdup(id
);
778 file_layer
= qdict_new();
779 driver_layer
= qdict_new();
781 qdict_put_str(file_layer
, "driver", "file");
782 qdict_put_str(file_layer
, "filename", filename
);
785 if (mode
&& *mode
!= 'w') {
786 qdict_put_bool(file_layer
, "read-only", true);
789 if (direct_io_safe
) {
792 if (!qemu_strtoul(direct_io_safe
, NULL
, 2, &value
) && !!value
) {
793 QDict
*cache_qdict
= qdict_new();
795 qdict_put_bool(cache_qdict
, "direct", true);
796 qdict_put(file_layer
, "cache", cache_qdict
);
798 qdict_put_str(file_layer
, "aio", "native");
802 if (discard_enable
) {
805 if (!qemu_strtoul(discard_enable
, NULL
, 2, &value
) && !!value
) {
806 qdict_put_str(file_layer
, "discard", "unmap");
807 qdict_put_str(driver_layer
, "discard", "unmap");
812 * It is necessary to turn file locking off as an emulated device
813 * may have already opened the same image file.
815 qdict_put_str(file_layer
, "locking", "off");
817 qdict_put_str(driver_layer
, "driver", driver
);
820 qdict_put(driver_layer
, "file", file_layer
);
822 g_assert(!drive
->node_name
);
823 drive
->node_name
= xen_block_blockdev_add(drive
->id
, driver_layer
,
826 qobject_unref(driver_layer
);
830 error_propagate(errp
, local_err
);
831 xen_block_drive_destroy(drive
, NULL
);
838 static const char *xen_block_drive_get_node_name(XenBlockDrive
*drive
)
840 return drive
->node_name
? drive
->node_name
: "";
843 static void xen_block_iothread_destroy(XenBlockIOThread
*iothread
,
846 qmp_object_del(iothread
->id
, errp
);
848 g_free(iothread
->id
);
852 static XenBlockIOThread
*xen_block_iothread_create(const char *id
,
855 XenBlockIOThread
*iothread
= g_new(XenBlockIOThread
, 1);
856 Error
*local_err
= NULL
;
858 QObject
*ret_data
= NULL
;
860 iothread
->id
= g_strdup(id
);
863 qdict_put_str(opts
, "qom-type", TYPE_IOTHREAD
);
864 qdict_put_str(opts
, "id", id
);
865 qmp_object_add(opts
, &ret_data
, &local_err
);
867 qobject_unref(ret_data
);
870 error_propagate(errp
, local_err
);
872 g_free(iothread
->id
);
880 static void xen_block_device_create(XenBackendInstance
*backend
,
881 QDict
*opts
, Error
**errp
)
883 XenBus
*xenbus
= xen_backend_get_bus(backend
);
884 const char *name
= xen_backend_get_name(backend
);
885 unsigned long number
;
886 const char *vdev
, *device_type
;
887 XenBlockDrive
*drive
= NULL
;
888 XenBlockIOThread
*iothread
= NULL
;
889 XenDevice
*xendev
= NULL
;
890 Error
*local_err
= NULL
;
892 XenBlockDevice
*blockdev
;
894 if (qemu_strtoul(name
, NULL
, 10, &number
)) {
895 error_setg(errp
, "failed to parse name '%s'", name
);
899 trace_xen_block_device_create(number
);
901 vdev
= qdict_get_try_str(opts
, "dev");
903 error_setg(errp
, "no dev parameter");
907 device_type
= qdict_get_try_str(opts
, "device-type");
909 error_setg(errp
, "no device-type parameter");
913 if (!strcmp(device_type
, "disk")) {
914 type
= TYPE_XEN_DISK_DEVICE
;
915 } else if (!strcmp(device_type
, "cdrom")) {
916 type
= TYPE_XEN_CDROM_DEVICE
;
918 error_setg(errp
, "invalid device-type parameter '%s'", device_type
);
922 drive
= xen_block_drive_create(vdev
, device_type
, opts
, &local_err
);
924 error_propagate_prepend(errp
, local_err
, "failed to create drive: ");
928 iothread
= xen_block_iothread_create(vdev
, &local_err
);
930 error_propagate_prepend(errp
, local_err
,
931 "failed to create iothread: ");
935 xendev
= XEN_DEVICE(qdev_new(type
));
936 blockdev
= XEN_BLOCK_DEVICE(xendev
);
938 if (!object_property_set_str(OBJECT(xendev
), "vdev", vdev
,
940 error_propagate_prepend(errp
, local_err
, "failed to set 'vdev': ");
944 if (!object_property_set_str(OBJECT(xendev
), "drive",
945 xen_block_drive_get_node_name(drive
),
947 error_propagate_prepend(errp
, local_err
, "failed to set 'drive': ");
951 if (!object_property_set_str(OBJECT(xendev
), "iothread", iothread
->id
,
953 error_propagate_prepend(errp
, local_err
,
954 "failed to set 'iothread': ");
958 blockdev
->iothread
= iothread
;
959 blockdev
->drive
= drive
;
961 if (!qdev_realize_and_unref(DEVICE(xendev
), BUS(xenbus
), &local_err
)) {
962 error_propagate_prepend(errp
, local_err
,
963 "realization of device %s failed: ",
968 xen_backend_set_device(backend
, xendev
);
973 object_unparent(OBJECT(xendev
));
977 xen_block_iothread_destroy(iothread
, NULL
);
981 xen_block_drive_destroy(drive
, NULL
);
985 static void xen_block_device_destroy(XenBackendInstance
*backend
,
988 XenDevice
*xendev
= xen_backend_get_device(backend
);
989 XenBlockDevice
*blockdev
= XEN_BLOCK_DEVICE(xendev
);
990 XenBlockVdev
*vdev
= &blockdev
->props
.vdev
;
991 XenBlockDrive
*drive
= blockdev
->drive
;
992 XenBlockIOThread
*iothread
= blockdev
->iothread
;
993 Error
*local_err
= NULL
;
995 trace_xen_block_device_destroy(vdev
->number
);
997 object_unparent(OBJECT(xendev
));
1000 xen_block_iothread_destroy(iothread
, &local_err
);
1002 error_propagate_prepend(errp
, local_err
,
1003 "failed to destroy iothread: ");
1009 xen_block_drive_destroy(drive
, &local_err
);
1011 error_propagate_prepend(errp
, local_err
,
1012 "failed to destroy drive: ");
1018 static const XenBackendInfo xen_block_backend_info
= {
1020 .create
= xen_block_device_create
,
1021 .destroy
= xen_block_device_destroy
,
1024 static void xen_block_register_backend(void)
1026 xen_backend_register(&xen_block_backend_info
);
1029 xen_backend_init(xen_block_register_backend
);