]>
Commit | Line | Data |
---|---|---|
1a72d9ae PD |
1 | /* |
2 | * Copyright (c) 2018 Citrix Systems Inc. | |
3 | * | |
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. | |
6 | */ | |
7 | ||
8 | #include "qemu/osdep.h" | |
9 | #include "qemu/cutils.h" | |
db9ff46e | 10 | #include "qemu/option.h" |
1a72d9ae | 11 | #include "qapi/error.h" |
db9ff46e PD |
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" | |
1a72d9ae | 16 | #include "qapi/visitor.h" |
db9ff46e PD |
17 | #include "qapi/qmp/qdict.h" |
18 | #include "qapi/qmp/qstring.h" | |
1a72d9ae | 19 | #include "hw/hw.h" |
b6af8926 PD |
20 | #include "hw/xen/xen_common.h" |
21 | #include "hw/block/xen_blkif.h" | |
1a72d9ae | 22 | #include "hw/xen/xen-block.h" |
db9ff46e | 23 | #include "hw/xen/xen-backend.h" |
b6af8926 PD |
24 | #include "sysemu/blockdev.h" |
25 | #include "sysemu/block-backend.h" | |
26 | #include "sysemu/iothread.h" | |
27 | #include "dataplane/xen-block.h" | |
1a72d9ae PD |
28 | #include "trace.h" |
29 | ||
094a2239 PD |
30 | static char *xen_block_get_name(XenDevice *xendev, Error **errp) |
31 | { | |
32 | XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev); | |
33 | XenBlockVdev *vdev = &blockdev->props.vdev; | |
34 | ||
35 | return g_strdup_printf("%lu", vdev->number); | |
36 | } | |
37 | ||
82a29e30 PD |
38 | static void xen_block_disconnect(XenDevice *xendev, Error **errp) |
39 | { | |
40 | XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev); | |
41 | const char *type = object_get_typename(OBJECT(blockdev)); | |
42 | XenBlockVdev *vdev = &blockdev->props.vdev; | |
43 | ||
44 | trace_xen_block_disconnect(type, vdev->disk, vdev->partition); | |
b6af8926 PD |
45 | |
46 | xen_block_dataplane_stop(blockdev->dataplane); | |
82a29e30 PD |
47 | } |
48 | ||
49 | static void xen_block_connect(XenDevice *xendev, Error **errp) | |
50 | { | |
51 | XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev); | |
52 | const char *type = object_get_typename(OBJECT(blockdev)); | |
53 | XenBlockVdev *vdev = &blockdev->props.vdev; | |
b6af8926 PD |
54 | unsigned int order, nr_ring_ref, *ring_ref, event_channel, protocol; |
55 | char *str; | |
82a29e30 PD |
56 | |
57 | trace_xen_block_connect(type, vdev->disk, vdev->partition); | |
b6af8926 PD |
58 | |
59 | if (xen_device_frontend_scanf(xendev, "ring-page-order", "%u", | |
60 | &order) != 1) { | |
61 | nr_ring_ref = 1; | |
62 | ring_ref = g_new(unsigned int, nr_ring_ref); | |
63 | ||
64 | if (xen_device_frontend_scanf(xendev, "ring-ref", "%u", | |
65 | &ring_ref[0]) != 1) { | |
66 | error_setg(errp, "failed to read ring-ref"); | |
67 | g_free(ring_ref); | |
68 | return; | |
69 | } | |
70 | } else if (order <= blockdev->props.max_ring_page_order) { | |
71 | unsigned int i; | |
72 | ||
73 | nr_ring_ref = 1 << order; | |
74 | ring_ref = g_new(unsigned int, nr_ring_ref); | |
75 | ||
76 | for (i = 0; i < nr_ring_ref; i++) { | |
77 | const char *key = g_strdup_printf("ring-ref%u", i); | |
78 | ||
79 | if (xen_device_frontend_scanf(xendev, key, "%u", | |
80 | &ring_ref[i]) != 1) { | |
81 | error_setg(errp, "failed to read %s", key); | |
82 | g_free((gpointer)key); | |
83 | g_free(ring_ref); | |
84 | return; | |
85 | } | |
86 | ||
87 | g_free((gpointer)key); | |
88 | } | |
89 | } else { | |
90 | error_setg(errp, "invalid ring-page-order (%d)", order); | |
91 | return; | |
92 | } | |
93 | ||
94 | if (xen_device_frontend_scanf(xendev, "event-channel", "%u", | |
95 | &event_channel) != 1) { | |
96 | error_setg(errp, "failed to read event-channel"); | |
97 | g_free(ring_ref); | |
98 | return; | |
99 | } | |
100 | ||
101 | if (xen_device_frontend_scanf(xendev, "protocol", "%ms", | |
102 | &str) != 1) { | |
103 | protocol = BLKIF_PROTOCOL_NATIVE; | |
104 | } else { | |
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; | |
109 | } else { | |
110 | protocol = BLKIF_PROTOCOL_NATIVE; | |
111 | } | |
112 | ||
113 | free(str); | |
114 | } | |
115 | ||
116 | xen_block_dataplane_start(blockdev->dataplane, ring_ref, nr_ring_ref, | |
117 | event_channel, protocol, errp); | |
118 | ||
119 | g_free(ring_ref); | |
82a29e30 PD |
120 | } |
121 | ||
1a72d9ae PD |
122 | static void xen_block_unrealize(XenDevice *xendev, Error **errp) |
123 | { | |
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; | |
129 | ||
130 | if (vdev->type == XEN_BLOCK_VDEV_TYPE_INVALID) { | |
131 | return; | |
132 | } | |
133 | ||
134 | trace_xen_block_unrealize(type, vdev->disk, vdev->partition); | |
135 | ||
82a29e30 PD |
136 | /* Disconnect from the frontend in case this has not already happened */ |
137 | xen_block_disconnect(xendev, NULL); | |
138 | ||
b6af8926 PD |
139 | xen_block_dataplane_destroy(blockdev->dataplane); |
140 | blockdev->dataplane = NULL; | |
141 | ||
1a72d9ae PD |
142 | if (blockdev_class->unrealize) { |
143 | blockdev_class->unrealize(blockdev, errp); | |
144 | } | |
145 | } | |
146 | ||
3149f183 PD |
147 | static void xen_block_set_size(XenBlockDevice *blockdev) |
148 | { | |
149 | const char *type = object_get_typename(OBJECT(blockdev)); | |
150 | XenBlockVdev *vdev = &blockdev->props.vdev; | |
151 | BlockConf *conf = &blockdev->props.conf; | |
2bcd05cf | 152 | int64_t sectors = blk_getlength(conf->blk) / XEN_BLKIF_SECTOR_SIZE; |
3149f183 PD |
153 | XenDevice *xendev = XEN_DEVICE(blockdev); |
154 | ||
155 | trace_xen_block_size(type, vdev->disk, vdev->partition, sectors); | |
156 | ||
157 | xen_device_backend_printf(xendev, "sectors", "%"PRIi64, sectors); | |
158 | } | |
159 | ||
160 | static void xen_block_resize_cb(void *opaque) | |
161 | { | |
162 | XenBlockDevice *blockdev = opaque; | |
163 | XenDevice *xendev = XEN_DEVICE(blockdev); | |
164 | enum xenbus_state state = xen_device_backend_get_state(xendev); | |
165 | ||
166 | xen_block_set_size(blockdev); | |
167 | ||
168 | /* | |
169 | * Mimic the behaviour of Linux xen-blkback and re-write the state | |
170 | * to trigger the frontend watch. | |
171 | */ | |
172 | xen_device_backend_printf(xendev, "state", "%u", state); | |
173 | } | |
174 | ||
175 | static const BlockDevOps xen_block_dev_ops = { | |
176 | .resize_cb = xen_block_resize_cb, | |
177 | }; | |
178 | ||
1a72d9ae PD |
179 | static void xen_block_realize(XenDevice *xendev, Error **errp) |
180 | { | |
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; | |
b6af8926 | 186 | BlockConf *conf = &blockdev->props.conf; |
1a72d9ae PD |
187 | Error *local_err = NULL; |
188 | ||
189 | if (vdev->type == XEN_BLOCK_VDEV_TYPE_INVALID) { | |
190 | error_setg(errp, "vdev property not set"); | |
191 | return; | |
192 | } | |
193 | ||
194 | trace_xen_block_realize(type, vdev->disk, vdev->partition); | |
195 | ||
196 | if (blockdev_class->realize) { | |
197 | blockdev_class->realize(blockdev, &local_err); | |
198 | if (local_err) { | |
199 | error_propagate(errp, local_err); | |
b6af8926 | 200 | return; |
1a72d9ae PD |
201 | } |
202 | } | |
b6af8926 PD |
203 | |
204 | /* | |
205 | * The blkif protocol does not deal with removable media, so it must | |
206 | * always be present, even for CDRom devices. | |
207 | */ | |
208 | assert(conf->blk); | |
209 | if (!blk_is_inserted(conf->blk)) { | |
210 | error_setg(errp, "device needs media, but drive is empty"); | |
211 | return; | |
212 | } | |
213 | ||
214 | if (!blkconf_apply_backend_options(conf, blockdev->info & VDISK_READONLY, | |
3149f183 | 215 | true, errp)) { |
b6af8926 PD |
216 | return; |
217 | } | |
218 | ||
219 | if (!(blockdev->info & VDISK_CDROM) && | |
220 | !blkconf_geometry(conf, NULL, 65535, 255, 255, errp)) { | |
221 | return; | |
222 | } | |
223 | ||
224 | blkconf_blocksizes(conf); | |
225 | ||
2bcd05cf PD |
226 | if (conf->logical_block_size != XEN_BLKIF_SECTOR_SIZE) { |
227 | error_setg(errp, "logical_block_size != %u not supported", | |
228 | XEN_BLKIF_SECTOR_SIZE); | |
229 | return; | |
230 | } | |
231 | ||
b6af8926 PD |
232 | if (conf->logical_block_size > conf->physical_block_size) { |
233 | error_setg( | |
234 | errp, "logical_block_size > physical_block_size not supported"); | |
235 | return; | |
236 | } | |
237 | ||
3149f183 | 238 | blk_set_dev_ops(conf->blk, &xen_block_dev_ops, blockdev); |
b6af8926 PD |
239 | blk_set_guest_block_size(conf->blk, conf->logical_block_size); |
240 | ||
15f08450 PD |
241 | if (conf->discard_granularity == -1) { |
242 | conf->discard_granularity = conf->physical_block_size; | |
243 | } | |
244 | ||
245 | if (blk_get_flags(conf->blk) & BDRV_O_UNMAP) { | |
b6af8926 | 246 | xen_device_backend_printf(xendev, "feature-discard", "%u", 1); |
15f08450 PD |
247 | xen_device_backend_printf(xendev, "discard-granularity", "%u", |
248 | conf->discard_granularity); | |
b6af8926 PD |
249 | } |
250 | ||
251 | xen_device_backend_printf(xendev, "feature-flush-cache", "%u", 1); | |
252 | xen_device_backend_printf(xendev, "max-ring-page-order", "%u", | |
253 | blockdev->props.max_ring_page_order); | |
254 | xen_device_backend_printf(xendev, "info", "%u", blockdev->info); | |
255 | ||
256 | xen_device_frontend_printf(xendev, "virtual-device", "%lu", | |
257 | vdev->number); | |
258 | xen_device_frontend_printf(xendev, "device-type", "%s", | |
259 | blockdev->device_type); | |
260 | ||
261 | xen_device_backend_printf(xendev, "sector-size", "%u", | |
2bcd05cf | 262 | XEN_BLKIF_SECTOR_SIZE); |
3149f183 PD |
263 | |
264 | xen_block_set_size(blockdev); | |
b6af8926 PD |
265 | |
266 | blockdev->dataplane = | |
267 | xen_block_dataplane_create(xendev, conf, blockdev->props.iothread); | |
1a72d9ae PD |
268 | } |
269 | ||
82a29e30 PD |
270 | static void xen_block_frontend_changed(XenDevice *xendev, |
271 | enum xenbus_state frontend_state, | |
272 | Error **errp) | |
273 | { | |
274 | enum xenbus_state backend_state = xen_device_backend_get_state(xendev); | |
275 | Error *local_err = NULL; | |
276 | ||
277 | switch (frontend_state) { | |
278 | case XenbusStateInitialised: | |
279 | case XenbusStateConnected: | |
280 | if (backend_state == XenbusStateConnected) { | |
281 | break; | |
282 | } | |
283 | ||
284 | xen_block_disconnect(xendev, &local_err); | |
285 | if (local_err) { | |
286 | error_propagate(errp, local_err); | |
287 | break; | |
288 | } | |
289 | ||
290 | xen_block_connect(xendev, &local_err); | |
291 | if (local_err) { | |
292 | error_propagate(errp, local_err); | |
293 | break; | |
294 | } | |
295 | ||
296 | xen_device_backend_set_state(xendev, XenbusStateConnected); | |
297 | break; | |
298 | ||
299 | case XenbusStateClosing: | |
300 | xen_device_backend_set_state(xendev, XenbusStateClosing); | |
301 | break; | |
302 | ||
303 | case XenbusStateClosed: | |
304 | xen_block_disconnect(xendev, &local_err); | |
305 | if (local_err) { | |
306 | error_propagate(errp, local_err); | |
307 | break; | |
308 | } | |
309 | ||
310 | xen_device_backend_set_state(xendev, XenbusStateClosed); | |
311 | break; | |
312 | ||
313 | default: | |
314 | break; | |
315 | } | |
316 | } | |
317 | ||
1a72d9ae PD |
318 | static char *disk_to_vbd_name(unsigned int disk) |
319 | { | |
320 | char *name, *prefix = (disk >= 26) ? | |
321 | disk_to_vbd_name((disk / 26) - 1) : g_strdup(""); | |
322 | ||
323 | name = g_strdup_printf("%s%c", prefix, 'a' + disk % 26); | |
324 | g_free(prefix); | |
325 | ||
326 | return name; | |
327 | } | |
328 | ||
329 | static void xen_block_get_vdev(Object *obj, Visitor *v, const char *name, | |
330 | void *opaque, Error **errp) | |
331 | { | |
332 | DeviceState *dev = DEVICE(obj); | |
333 | Property *prop = opaque; | |
334 | XenBlockVdev *vdev = qdev_get_prop_ptr(dev, prop); | |
335 | char *str; | |
336 | ||
337 | switch (vdev->type) { | |
338 | case XEN_BLOCK_VDEV_TYPE_DP: | |
339 | str = g_strdup_printf("d%lup%lu", vdev->disk, vdev->partition); | |
340 | break; | |
341 | ||
342 | case XEN_BLOCK_VDEV_TYPE_XVD: | |
343 | case XEN_BLOCK_VDEV_TYPE_HD: | |
344 | case XEN_BLOCK_VDEV_TYPE_SD: { | |
345 | char *name = disk_to_vbd_name(vdev->disk); | |
346 | ||
347 | str = g_strdup_printf("%s%s%lu", | |
348 | (vdev->type == XEN_BLOCK_VDEV_TYPE_XVD) ? | |
349 | "xvd" : | |
350 | (vdev->type == XEN_BLOCK_VDEV_TYPE_HD) ? | |
351 | "hd" : | |
352 | "sd", | |
353 | name, vdev->partition); | |
354 | g_free(name); | |
355 | break; | |
356 | } | |
357 | default: | |
358 | error_setg(errp, "invalid vdev type"); | |
359 | return; | |
360 | } | |
361 | ||
362 | visit_type_str(v, name, &str, errp); | |
363 | g_free(str); | |
364 | } | |
365 | ||
2ae23f0e PD |
366 | static int vbd_name_to_disk(const char *name, const char **endp, |
367 | unsigned long *disk) | |
1a72d9ae | 368 | { |
2ae23f0e | 369 | unsigned int n = 0; |
1a72d9ae PD |
370 | |
371 | while (*name != '\0') { | |
372 | if (!g_ascii_isalpha(*name) || !g_ascii_islower(*name)) { | |
373 | break; | |
374 | } | |
375 | ||
2ae23f0e PD |
376 | n *= 26; |
377 | n += *name++ - 'a' + 1; | |
1a72d9ae PD |
378 | } |
379 | *endp = name; | |
380 | ||
2ae23f0e PD |
381 | if (!n) { |
382 | return -1; | |
383 | } | |
384 | ||
385 | *disk = n - 1; | |
386 | ||
387 | return 0; | |
1a72d9ae PD |
388 | } |
389 | ||
390 | static void xen_block_set_vdev(Object *obj, Visitor *v, const char *name, | |
391 | void *opaque, Error **errp) | |
392 | { | |
393 | DeviceState *dev = DEVICE(obj); | |
394 | Property *prop = opaque; | |
395 | XenBlockVdev *vdev = qdev_get_prop_ptr(dev, prop); | |
396 | Error *local_err = NULL; | |
397 | char *str, *p; | |
398 | const char *end; | |
399 | ||
400 | if (dev->realized) { | |
401 | qdev_prop_set_after_realize(dev, name, errp); | |
402 | return; | |
403 | } | |
404 | ||
405 | visit_type_str(v, name, &str, &local_err); | |
406 | if (local_err) { | |
407 | error_propagate(errp, local_err); | |
408 | return; | |
409 | } | |
410 | ||
411 | p = strchr(str, 'd'); | |
412 | if (!p) { | |
413 | goto invalid; | |
414 | } | |
415 | ||
416 | *p++ = '\0'; | |
417 | if (*str == '\0') { | |
418 | vdev->type = XEN_BLOCK_VDEV_TYPE_DP; | |
419 | } else if (strcmp(str, "xv") == 0) { | |
420 | vdev->type = XEN_BLOCK_VDEV_TYPE_XVD; | |
421 | } else if (strcmp(str, "h") == 0) { | |
422 | vdev->type = XEN_BLOCK_VDEV_TYPE_HD; | |
423 | } else if (strcmp(str, "s") == 0) { | |
424 | vdev->type = XEN_BLOCK_VDEV_TYPE_SD; | |
425 | } else { | |
426 | goto invalid; | |
427 | } | |
428 | ||
429 | if (vdev->type == XEN_BLOCK_VDEV_TYPE_DP) { | |
430 | if (qemu_strtoul(p, &end, 10, &vdev->disk)) { | |
431 | goto invalid; | |
432 | } | |
433 | ||
434 | if (*end == 'p') { | |
210b9776 | 435 | if (*(++end) == '\0') { |
1a72d9ae PD |
436 | goto invalid; |
437 | } | |
438 | } | |
439 | } else { | |
2ae23f0e PD |
440 | if (vbd_name_to_disk(p, &end, &vdev->disk)) { |
441 | goto invalid; | |
442 | } | |
1a72d9ae PD |
443 | } |
444 | ||
445 | if (*end != '\0') { | |
446 | p = (char *)end; | |
447 | ||
448 | if (qemu_strtoul(p, &end, 10, &vdev->partition)) { | |
449 | goto invalid; | |
450 | } | |
451 | ||
452 | if (*end != '\0') { | |
453 | goto invalid; | |
454 | } | |
455 | } else { | |
456 | vdev->partition = 0; | |
457 | } | |
458 | ||
459 | switch (vdev->type) { | |
460 | case XEN_BLOCK_VDEV_TYPE_DP: | |
461 | case XEN_BLOCK_VDEV_TYPE_XVD: | |
462 | if (vdev->disk < (1 << 4) && vdev->partition < (1 << 4)) { | |
463 | vdev->number = (202 << 8) | (vdev->disk << 4) | | |
464 | vdev->partition; | |
465 | } else if (vdev->disk < (1 << 20) && vdev->partition < (1 << 8)) { | |
466 | vdev->number = (1 << 28) | (vdev->disk << 8) | | |
467 | vdev->partition; | |
468 | } else { | |
469 | goto invalid; | |
470 | } | |
471 | break; | |
472 | ||
473 | case XEN_BLOCK_VDEV_TYPE_HD: | |
474 | if ((vdev->disk == 0 || vdev->disk == 1) && | |
475 | vdev->partition < (1 << 6)) { | |
476 | vdev->number = (3 << 8) | (vdev->disk << 6) | vdev->partition; | |
477 | } else if ((vdev->disk == 2 || vdev->disk == 3) && | |
478 | vdev->partition < (1 << 6)) { | |
479 | vdev->number = (22 << 8) | ((vdev->disk - 2) << 6) | | |
480 | vdev->partition; | |
481 | } else { | |
482 | goto invalid; | |
483 | } | |
484 | break; | |
485 | ||
486 | case XEN_BLOCK_VDEV_TYPE_SD: | |
487 | if (vdev->disk < (1 << 4) && vdev->partition < (1 << 4)) { | |
488 | vdev->number = (8 << 8) | (vdev->disk << 4) | vdev->partition; | |
489 | } else { | |
490 | goto invalid; | |
491 | } | |
492 | break; | |
493 | ||
494 | default: | |
495 | goto invalid; | |
496 | } | |
497 | ||
498 | g_free(str); | |
499 | return; | |
500 | ||
501 | invalid: | |
502 | error_setg(errp, "invalid virtual disk specifier"); | |
503 | ||
504 | vdev->type = XEN_BLOCK_VDEV_TYPE_INVALID; | |
505 | g_free(str); | |
506 | } | |
507 | ||
508 | /* | |
509 | * This property deals with 'vdev' names adhering to the Xen VBD naming | |
510 | * scheme described in: | |
511 | * | |
512 | * https://xenbits.xen.org/docs/unstable/man/xen-vbd-interface.7.html | |
513 | */ | |
514 | const PropertyInfo xen_block_prop_vdev = { | |
515 | .name = "str", | |
516 | .description = "Virtual Disk specifier: d*p*/xvd*/hd*/sd*", | |
517 | .get = xen_block_get_vdev, | |
518 | .set = xen_block_set_vdev, | |
519 | }; | |
520 | ||
521 | static Property xen_block_props[] = { | |
522 | DEFINE_PROP("vdev", XenBlockDevice, props.vdev, | |
523 | xen_block_prop_vdev, XenBlockVdev), | |
b6af8926 PD |
524 | DEFINE_BLOCK_PROPERTIES(XenBlockDevice, props.conf), |
525 | DEFINE_PROP_UINT32("max-ring-page-order", XenBlockDevice, | |
526 | props.max_ring_page_order, 4), | |
527 | DEFINE_PROP_LINK("iothread", XenBlockDevice, props.iothread, | |
528 | TYPE_IOTHREAD, IOThread *), | |
1a72d9ae PD |
529 | DEFINE_PROP_END_OF_LIST() |
530 | }; | |
531 | ||
532 | static void xen_block_class_init(ObjectClass *class, void *data) | |
533 | { | |
534 | DeviceClass *dev_class = DEVICE_CLASS(class); | |
535 | XenDeviceClass *xendev_class = XEN_DEVICE_CLASS(class); | |
536 | ||
db9ff46e | 537 | xendev_class->backend = "qdisk"; |
b6af8926 | 538 | xendev_class->device = "vbd"; |
094a2239 | 539 | xendev_class->get_name = xen_block_get_name; |
1a72d9ae | 540 | xendev_class->realize = xen_block_realize; |
82a29e30 | 541 | xendev_class->frontend_changed = xen_block_frontend_changed; |
1a72d9ae PD |
542 | xendev_class->unrealize = xen_block_unrealize; |
543 | ||
544 | dev_class->props = xen_block_props; | |
545 | } | |
546 | ||
547 | static const TypeInfo xen_block_type_info = { | |
548 | .name = TYPE_XEN_BLOCK_DEVICE, | |
549 | .parent = TYPE_XEN_DEVICE, | |
550 | .instance_size = sizeof(XenBlockDevice), | |
551 | .abstract = true, | |
552 | .class_size = sizeof(XenBlockDeviceClass), | |
553 | .class_init = xen_block_class_init, | |
554 | }; | |
555 | ||
556 | static void xen_disk_unrealize(XenBlockDevice *blockdev, Error **errp) | |
557 | { | |
558 | trace_xen_disk_unrealize(); | |
559 | } | |
560 | ||
561 | static void xen_disk_realize(XenBlockDevice *blockdev, Error **errp) | |
562 | { | |
b6af8926 PD |
563 | BlockConf *conf = &blockdev->props.conf; |
564 | ||
1a72d9ae | 565 | trace_xen_disk_realize(); |
b6af8926 PD |
566 | |
567 | blockdev->device_type = "disk"; | |
568 | ||
569 | if (!conf->blk) { | |
570 | error_setg(errp, "drive property not set"); | |
571 | return; | |
572 | } | |
573 | ||
574 | blockdev->info = blk_is_read_only(conf->blk) ? VDISK_READONLY : 0; | |
1a72d9ae PD |
575 | } |
576 | ||
577 | static void xen_disk_class_init(ObjectClass *class, void *data) | |
578 | { | |
579 | DeviceClass *dev_class = DEVICE_CLASS(class); | |
580 | XenBlockDeviceClass *blockdev_class = XEN_BLOCK_DEVICE_CLASS(class); | |
581 | ||
582 | blockdev_class->realize = xen_disk_realize; | |
583 | blockdev_class->unrealize = xen_disk_unrealize; | |
584 | ||
585 | dev_class->desc = "Xen Disk Device"; | |
586 | } | |
587 | ||
588 | static const TypeInfo xen_disk_type_info = { | |
589 | .name = TYPE_XEN_DISK_DEVICE, | |
590 | .parent = TYPE_XEN_BLOCK_DEVICE, | |
591 | .instance_size = sizeof(XenDiskDevice), | |
592 | .class_init = xen_disk_class_init, | |
593 | }; | |
594 | ||
595 | static void xen_cdrom_unrealize(XenBlockDevice *blockdev, Error **errp) | |
596 | { | |
597 | trace_xen_cdrom_unrealize(); | |
598 | } | |
599 | ||
600 | static void xen_cdrom_realize(XenBlockDevice *blockdev, Error **errp) | |
601 | { | |
b6af8926 PD |
602 | BlockConf *conf = &blockdev->props.conf; |
603 | ||
1a72d9ae | 604 | trace_xen_cdrom_realize(); |
b6af8926 PD |
605 | |
606 | blockdev->device_type = "cdrom"; | |
607 | ||
608 | if (!conf->blk) { | |
609 | int rc; | |
610 | ||
611 | /* Set up an empty drive */ | |
612 | conf->blk = blk_new(0, BLK_PERM_ALL); | |
613 | ||
614 | rc = blk_attach_dev(conf->blk, DEVICE(blockdev)); | |
615 | if (!rc) { | |
616 | error_setg_errno(errp, -rc, "failed to create drive"); | |
617 | return; | |
618 | } | |
619 | } | |
620 | ||
621 | blockdev->info = VDISK_READONLY | VDISK_CDROM; | |
1a72d9ae PD |
622 | } |
623 | ||
624 | static void xen_cdrom_class_init(ObjectClass *class, void *data) | |
625 | { | |
626 | DeviceClass *dev_class = DEVICE_CLASS(class); | |
627 | XenBlockDeviceClass *blockdev_class = XEN_BLOCK_DEVICE_CLASS(class); | |
628 | ||
629 | blockdev_class->realize = xen_cdrom_realize; | |
630 | blockdev_class->unrealize = xen_cdrom_unrealize; | |
631 | ||
632 | dev_class->desc = "Xen CD-ROM Device"; | |
633 | } | |
634 | ||
635 | static const TypeInfo xen_cdrom_type_info = { | |
636 | .name = TYPE_XEN_CDROM_DEVICE, | |
637 | .parent = TYPE_XEN_BLOCK_DEVICE, | |
638 | .instance_size = sizeof(XenCDRomDevice), | |
639 | .class_init = xen_cdrom_class_init, | |
640 | }; | |
641 | ||
642 | static void xen_block_register_types(void) | |
643 | { | |
644 | type_register_static(&xen_block_type_info); | |
645 | type_register_static(&xen_disk_type_info); | |
646 | type_register_static(&xen_cdrom_type_info); | |
647 | } | |
648 | ||
649 | type_init(xen_block_register_types) | |
db9ff46e PD |
650 | |
651 | static void xen_block_blockdev_del(const char *node_name, Error **errp) | |
652 | { | |
653 | trace_xen_block_blockdev_del(node_name); | |
654 | ||
655 | qmp_blockdev_del(node_name, errp); | |
656 | } | |
657 | ||
658 | static char *xen_block_blockdev_add(const char *id, QDict *qdict, | |
659 | Error **errp) | |
660 | { | |
661 | const char *driver = qdict_get_try_str(qdict, "driver"); | |
662 | BlockdevOptions *options = NULL; | |
663 | Error *local_err = NULL; | |
664 | char *node_name; | |
665 | Visitor *v; | |
666 | ||
667 | if (!driver) { | |
668 | error_setg(errp, "no 'driver' parameter"); | |
669 | return NULL; | |
670 | } | |
671 | ||
672 | node_name = g_strdup_printf("%s-%s", id, driver); | |
673 | qdict_put_str(qdict, "node-name", node_name); | |
674 | ||
675 | trace_xen_block_blockdev_add(node_name); | |
676 | ||
677 | v = qobject_input_visitor_new(QOBJECT(qdict)); | |
678 | visit_type_BlockdevOptions(v, NULL, &options, &local_err); | |
679 | visit_free(v); | |
680 | ||
681 | if (local_err) { | |
682 | error_propagate(errp, local_err); | |
683 | goto fail; | |
684 | } | |
685 | ||
686 | qmp_blockdev_add(options, &local_err); | |
687 | ||
688 | if (local_err) { | |
689 | error_propagate(errp, local_err); | |
690 | goto fail; | |
691 | } | |
692 | ||
693 | qapi_free_BlockdevOptions(options); | |
694 | ||
695 | return node_name; | |
696 | ||
697 | fail: | |
698 | if (options) { | |
699 | qapi_free_BlockdevOptions(options); | |
700 | } | |
701 | g_free(node_name); | |
702 | ||
703 | return NULL; | |
704 | } | |
705 | ||
706 | static void xen_block_drive_destroy(XenBlockDrive *drive, Error **errp) | |
707 | { | |
708 | char *node_name = drive->node_name; | |
709 | ||
710 | if (node_name) { | |
711 | Error *local_err = NULL; | |
712 | ||
713 | xen_block_blockdev_del(node_name, &local_err); | |
714 | if (local_err) { | |
715 | error_propagate(errp, local_err); | |
716 | return; | |
717 | } | |
718 | g_free(node_name); | |
719 | drive->node_name = NULL; | |
720 | } | |
721 | g_free(drive->id); | |
722 | g_free(drive); | |
723 | } | |
724 | ||
725 | static XenBlockDrive *xen_block_drive_create(const char *id, | |
726 | const char *device_type, | |
727 | QDict *opts, Error **errp) | |
728 | { | |
729 | const char *params = qdict_get_try_str(opts, "params"); | |
730 | const char *mode = qdict_get_try_str(opts, "mode"); | |
731 | const char *direct_io_safe = qdict_get_try_str(opts, "direct-io-safe"); | |
732 | const char *discard_enable = qdict_get_try_str(opts, "discard-enable"); | |
733 | char *driver = NULL; | |
734 | char *filename = NULL; | |
735 | XenBlockDrive *drive = NULL; | |
736 | Error *local_err = NULL; | |
737 | QDict *file_layer; | |
738 | QDict *driver_layer; | |
739 | ||
740 | if (params) { | |
741 | char **v = g_strsplit(params, ":", 2); | |
742 | ||
743 | if (v[1] == NULL) { | |
744 | filename = g_strdup(v[0]); | |
745 | driver = g_strdup("raw"); | |
746 | } else { | |
747 | if (strcmp(v[0], "aio") == 0) { | |
748 | driver = g_strdup("raw"); | |
749 | } else if (strcmp(v[0], "vhd") == 0) { | |
750 | driver = g_strdup("vpc"); | |
751 | } else { | |
752 | driver = g_strdup(v[0]); | |
753 | } | |
754 | filename = g_strdup(v[1]); | |
755 | } | |
756 | ||
757 | g_strfreev(v); | |
156ac944 PD |
758 | } else { |
759 | error_setg(errp, "no params"); | |
db9ff46e PD |
760 | goto done; |
761 | } | |
156ac944 PD |
762 | |
763 | assert(filename); | |
db9ff46e PD |
764 | assert(driver); |
765 | ||
766 | drive = g_new0(XenBlockDrive, 1); | |
767 | drive->id = g_strdup(id); | |
768 | ||
769 | file_layer = qdict_new(); | |
15f08450 | 770 | driver_layer = qdict_new(); |
db9ff46e PD |
771 | |
772 | qdict_put_str(file_layer, "driver", "file"); | |
773 | qdict_put_str(file_layer, "filename", filename); | |
156ac944 | 774 | g_free(filename); |
db9ff46e PD |
775 | |
776 | if (mode && *mode != 'w') { | |
777 | qdict_put_bool(file_layer, "read-only", true); | |
778 | } | |
779 | ||
780 | if (direct_io_safe) { | |
781 | unsigned long value; | |
782 | ||
783 | if (!qemu_strtoul(direct_io_safe, NULL, 2, &value) && !!value) { | |
784 | QDict *cache_qdict = qdict_new(); | |
785 | ||
786 | qdict_put_bool(cache_qdict, "direct", true); | |
ad85b0b4 | 787 | qdict_put(file_layer, "cache", cache_qdict); |
db9ff46e PD |
788 | |
789 | qdict_put_str(file_layer, "aio", "native"); | |
790 | } | |
791 | } | |
792 | ||
793 | if (discard_enable) { | |
794 | unsigned long value; | |
795 | ||
796 | if (!qemu_strtoul(discard_enable, NULL, 2, &value) && !!value) { | |
797 | qdict_put_str(file_layer, "discard", "unmap"); | |
15f08450 | 798 | qdict_put_str(driver_layer, "discard", "unmap"); |
db9ff46e PD |
799 | } |
800 | } | |
801 | ||
802 | /* | |
803 | * It is necessary to turn file locking off as an emulated device | |
804 | * may have already opened the same image file. | |
805 | */ | |
806 | qdict_put_str(file_layer, "locking", "off"); | |
807 | ||
db9ff46e | 808 | qdict_put_str(driver_layer, "driver", driver); |
156ac944 PD |
809 | g_free(driver); |
810 | ||
ad85b0b4 | 811 | qdict_put(driver_layer, "file", file_layer); |
db9ff46e PD |
812 | |
813 | g_assert(!drive->node_name); | |
814 | drive->node_name = xen_block_blockdev_add(drive->id, driver_layer, | |
815 | &local_err); | |
816 | ||
156ac944 | 817 | qobject_unref(driver_layer); |
db9ff46e | 818 | |
156ac944 | 819 | done: |
db9ff46e PD |
820 | if (local_err) { |
821 | error_propagate(errp, local_err); | |
822 | xen_block_drive_destroy(drive, NULL); | |
823 | return NULL; | |
824 | } | |
825 | ||
826 | return drive; | |
827 | } | |
828 | ||
829 | static const char *xen_block_drive_get_node_name(XenBlockDrive *drive) | |
830 | { | |
831 | return drive->node_name ? drive->node_name : ""; | |
832 | } | |
833 | ||
834 | static void xen_block_iothread_destroy(XenBlockIOThread *iothread, | |
835 | Error **errp) | |
836 | { | |
837 | qmp_object_del(iothread->id, errp); | |
838 | ||
839 | g_free(iothread->id); | |
840 | g_free(iothread); | |
841 | } | |
842 | ||
843 | static XenBlockIOThread *xen_block_iothread_create(const char *id, | |
844 | Error **errp) | |
845 | { | |
846 | XenBlockIOThread *iothread = g_new(XenBlockIOThread, 1); | |
847 | Error *local_err = NULL; | |
848 | ||
849 | iothread->id = g_strdup(id); | |
850 | ||
851 | qmp_object_add(TYPE_IOTHREAD, id, false, NULL, &local_err); | |
852 | if (local_err) { | |
853 | error_propagate(errp, local_err); | |
854 | ||
855 | g_free(iothread->id); | |
856 | g_free(iothread); | |
857 | return NULL; | |
858 | } | |
859 | ||
860 | return iothread; | |
861 | } | |
862 | ||
863 | static void xen_block_device_create(XenBackendInstance *backend, | |
864 | QDict *opts, Error **errp) | |
865 | { | |
866 | XenBus *xenbus = xen_backend_get_bus(backend); | |
867 | const char *name = xen_backend_get_name(backend); | |
868 | unsigned long number; | |
869 | const char *vdev, *device_type; | |
870 | XenBlockDrive *drive = NULL; | |
871 | XenBlockIOThread *iothread = NULL; | |
872 | XenDevice *xendev = NULL; | |
873 | Error *local_err = NULL; | |
874 | const char *type; | |
875 | XenBlockDevice *blockdev; | |
876 | ||
877 | if (qemu_strtoul(name, NULL, 10, &number)) { | |
878 | error_setg(errp, "failed to parse name '%s'", name); | |
879 | goto fail; | |
880 | } | |
881 | ||
882 | trace_xen_block_device_create(number); | |
883 | ||
884 | vdev = qdict_get_try_str(opts, "dev"); | |
885 | if (!vdev) { | |
886 | error_setg(errp, "no dev parameter"); | |
887 | goto fail; | |
888 | } | |
889 | ||
890 | device_type = qdict_get_try_str(opts, "device-type"); | |
891 | if (!device_type) { | |
892 | error_setg(errp, "no device-type parameter"); | |
893 | goto fail; | |
894 | } | |
895 | ||
896 | if (!strcmp(device_type, "disk")) { | |
897 | type = TYPE_XEN_DISK_DEVICE; | |
898 | } else if (!strcmp(device_type, "cdrom")) { | |
899 | type = TYPE_XEN_CDROM_DEVICE; | |
900 | } else { | |
901 | error_setg(errp, "invalid device-type parameter '%s'", device_type); | |
902 | goto fail; | |
903 | } | |
904 | ||
905 | drive = xen_block_drive_create(vdev, device_type, opts, &local_err); | |
906 | if (!drive) { | |
907 | error_propagate_prepend(errp, local_err, "failed to create drive: "); | |
908 | goto fail; | |
909 | } | |
910 | ||
911 | iothread = xen_block_iothread_create(vdev, &local_err); | |
912 | if (local_err) { | |
913 | error_propagate_prepend(errp, local_err, | |
914 | "failed to create iothread: "); | |
915 | goto fail; | |
916 | } | |
917 | ||
918 | xendev = XEN_DEVICE(qdev_create(BUS(xenbus), type)); | |
919 | blockdev = XEN_BLOCK_DEVICE(xendev); | |
920 | ||
921 | object_property_set_str(OBJECT(xendev), vdev, "vdev", &local_err); | |
922 | if (local_err) { | |
923 | error_propagate_prepend(errp, local_err, "failed to set 'vdev': "); | |
924 | goto fail; | |
925 | } | |
926 | ||
927 | object_property_set_str(OBJECT(xendev), | |
928 | xen_block_drive_get_node_name(drive), "drive", | |
929 | &local_err); | |
930 | if (local_err) { | |
931 | error_propagate_prepend(errp, local_err, "failed to set 'drive': "); | |
932 | goto fail; | |
933 | } | |
934 | ||
935 | object_property_set_str(OBJECT(xendev), iothread->id, "iothread", | |
936 | &local_err); | |
937 | if (local_err) { | |
938 | error_propagate_prepend(errp, local_err, | |
939 | "failed to set 'iothread': "); | |
940 | goto fail; | |
941 | } | |
942 | ||
943 | blockdev->iothread = iothread; | |
944 | blockdev->drive = drive; | |
945 | ||
946 | object_property_set_bool(OBJECT(xendev), true, "realized", &local_err); | |
947 | if (local_err) { | |
948 | error_propagate_prepend(errp, local_err, | |
949 | "realization of device %s failed: ", | |
950 | type); | |
951 | goto fail; | |
952 | } | |
953 | ||
954 | xen_backend_set_device(backend, xendev); | |
955 | return; | |
956 | ||
957 | fail: | |
958 | if (xendev) { | |
959 | object_unparent(OBJECT(xendev)); | |
960 | } | |
961 | ||
962 | if (iothread) { | |
963 | xen_block_iothread_destroy(iothread, NULL); | |
964 | } | |
965 | ||
966 | if (drive) { | |
967 | xen_block_drive_destroy(drive, NULL); | |
968 | } | |
969 | } | |
970 | ||
971 | static void xen_block_device_destroy(XenBackendInstance *backend, | |
972 | Error **errp) | |
973 | { | |
974 | XenDevice *xendev = xen_backend_get_device(backend); | |
975 | XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev); | |
976 | XenBlockVdev *vdev = &blockdev->props.vdev; | |
977 | XenBlockDrive *drive = blockdev->drive; | |
978 | XenBlockIOThread *iothread = blockdev->iothread; | |
979 | ||
980 | trace_xen_block_device_destroy(vdev->number); | |
981 | ||
982 | object_unparent(OBJECT(xendev)); | |
983 | ||
984 | if (iothread) { | |
985 | Error *local_err = NULL; | |
986 | ||
987 | xen_block_iothread_destroy(iothread, &local_err); | |
988 | if (local_err) { | |
989 | error_propagate_prepend(errp, local_err, | |
990 | "failed to destroy iothread: "); | |
991 | return; | |
992 | } | |
993 | } | |
994 | ||
995 | if (drive) { | |
996 | Error *local_err = NULL; | |
997 | ||
998 | xen_block_drive_destroy(drive, &local_err); | |
999 | if (local_err) { | |
1000 | error_propagate_prepend(errp, local_err, | |
1001 | "failed to destroy drive: "); | |
1002 | } | |
1003 | } | |
1004 | } | |
1005 | ||
1006 | static const XenBackendInfo xen_block_backend_info = { | |
1007 | .type = "qdisk", | |
1008 | .create = xen_block_device_create, | |
1009 | .destroy = xen_block_device_destroy, | |
1010 | }; | |
1011 | ||
1012 | static void xen_block_register_backend(void) | |
1013 | { | |
1014 | xen_backend_register(&xen_block_backend_info); | |
1015 | } | |
1016 | ||
1017 | xen_backend_init(xen_block_register_backend); |