]>
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" | |
db725815 | 10 | #include "qemu/main-loop.h" |
0b8fa32f | 11 | #include "qemu/module.h" |
db9ff46e | 12 | #include "qemu/option.h" |
1a72d9ae | 13 | #include "qapi/error.h" |
db9ff46e | 14 | #include "qapi/qapi-commands-block-core.h" |
c577ff62 | 15 | #include "qapi/qapi-commands-qom.h" |
db9ff46e PD |
16 | #include "qapi/qapi-visit-block-core.h" |
17 | #include "qapi/qobject-input-visitor.h" | |
1a72d9ae | 18 | #include "qapi/visitor.h" |
db9ff46e PD |
19 | #include "qapi/qmp/qdict.h" |
20 | #include "qapi/qmp/qstring.h" | |
b6af8926 PD |
21 | #include "hw/xen/xen_common.h" |
22 | #include "hw/block/xen_blkif.h" | |
a27bd6c7 | 23 | #include "hw/qdev-properties.h" |
1a72d9ae | 24 | #include "hw/xen/xen-block.h" |
db9ff46e | 25 | #include "hw/xen/xen-backend.h" |
b6af8926 PD |
26 | #include "sysemu/blockdev.h" |
27 | #include "sysemu/block-backend.h" | |
28 | #include "sysemu/iothread.h" | |
29 | #include "dataplane/xen-block.h" | |
1a72d9ae PD |
30 | #include "trace.h" |
31 | ||
094a2239 PD |
32 | static char *xen_block_get_name(XenDevice *xendev, Error **errp) |
33 | { | |
34 | XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev); | |
35 | XenBlockVdev *vdev = &blockdev->props.vdev; | |
36 | ||
37 | return g_strdup_printf("%lu", vdev->number); | |
38 | } | |
39 | ||
82a29e30 PD |
40 | static void xen_block_disconnect(XenDevice *xendev, Error **errp) |
41 | { | |
42 | XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev); | |
43 | const char *type = object_get_typename(OBJECT(blockdev)); | |
44 | XenBlockVdev *vdev = &blockdev->props.vdev; | |
45 | ||
46 | trace_xen_block_disconnect(type, vdev->disk, vdev->partition); | |
b6af8926 PD |
47 | |
48 | xen_block_dataplane_stop(blockdev->dataplane); | |
82a29e30 PD |
49 | } |
50 | ||
51 | static void xen_block_connect(XenDevice *xendev, Error **errp) | |
52 | { | |
53 | XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev); | |
54 | const char *type = object_get_typename(OBJECT(blockdev)); | |
55 | XenBlockVdev *vdev = &blockdev->props.vdev; | |
5feeb718 PD |
56 | BlockConf *conf = &blockdev->props.conf; |
57 | unsigned int feature_large_sector_size; | |
b6af8926 PD |
58 | unsigned int order, nr_ring_ref, *ring_ref, event_channel, protocol; |
59 | char *str; | |
82a29e30 PD |
60 | |
61 | trace_xen_block_connect(type, vdev->disk, vdev->partition); | |
b6af8926 | 62 | |
5feeb718 PD |
63 | if (xen_device_frontend_scanf(xendev, "feature-large-sector-size", "%u", |
64 | &feature_large_sector_size) != 1) { | |
65 | feature_large_sector_size = 0; | |
66 | } | |
67 | ||
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); | |
72 | return; | |
73 | } | |
74 | ||
b6af8926 PD |
75 | if (xen_device_frontend_scanf(xendev, "ring-page-order", "%u", |
76 | &order) != 1) { | |
77 | nr_ring_ref = 1; | |
78 | ring_ref = g_new(unsigned int, nr_ring_ref); | |
79 | ||
80 | if (xen_device_frontend_scanf(xendev, "ring-ref", "%u", | |
81 | &ring_ref[0]) != 1) { | |
82 | error_setg(errp, "failed to read ring-ref"); | |
83 | g_free(ring_ref); | |
84 | return; | |
85 | } | |
86 | } else if (order <= blockdev->props.max_ring_page_order) { | |
87 | unsigned int i; | |
88 | ||
89 | nr_ring_ref = 1 << order; | |
90 | ring_ref = g_new(unsigned int, nr_ring_ref); | |
91 | ||
92 | for (i = 0; i < nr_ring_ref; i++) { | |
93 | const char *key = g_strdup_printf("ring-ref%u", i); | |
94 | ||
95 | if (xen_device_frontend_scanf(xendev, key, "%u", | |
96 | &ring_ref[i]) != 1) { | |
97 | error_setg(errp, "failed to read %s", key); | |
98 | g_free((gpointer)key); | |
99 | g_free(ring_ref); | |
100 | return; | |
101 | } | |
102 | ||
103 | g_free((gpointer)key); | |
104 | } | |
105 | } else { | |
106 | error_setg(errp, "invalid ring-page-order (%d)", order); | |
107 | return; | |
108 | } | |
109 | ||
110 | if (xen_device_frontend_scanf(xendev, "event-channel", "%u", | |
111 | &event_channel) != 1) { | |
112 | error_setg(errp, "failed to read event-channel"); | |
113 | g_free(ring_ref); | |
114 | return; | |
115 | } | |
116 | ||
117 | if (xen_device_frontend_scanf(xendev, "protocol", "%ms", | |
118 | &str) != 1) { | |
119 | protocol = BLKIF_PROTOCOL_NATIVE; | |
120 | } else { | |
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; | |
125 | } else { | |
126 | protocol = BLKIF_PROTOCOL_NATIVE; | |
127 | } | |
128 | ||
129 | free(str); | |
130 | } | |
131 | ||
132 | xen_block_dataplane_start(blockdev->dataplane, ring_ref, nr_ring_ref, | |
133 | event_channel, protocol, errp); | |
134 | ||
135 | g_free(ring_ref); | |
82a29e30 PD |
136 | } |
137 | ||
1a72d9ae PD |
138 | static void xen_block_unrealize(XenDevice *xendev, Error **errp) |
139 | { | |
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; | |
145 | ||
146 | if (vdev->type == XEN_BLOCK_VDEV_TYPE_INVALID) { | |
147 | return; | |
148 | } | |
149 | ||
150 | trace_xen_block_unrealize(type, vdev->disk, vdev->partition); | |
151 | ||
82a29e30 PD |
152 | /* Disconnect from the frontend in case this has not already happened */ |
153 | xen_block_disconnect(xendev, NULL); | |
154 | ||
b6af8926 PD |
155 | xen_block_dataplane_destroy(blockdev->dataplane); |
156 | blockdev->dataplane = NULL; | |
157 | ||
1a72d9ae PD |
158 | if (blockdev_class->unrealize) { |
159 | blockdev_class->unrealize(blockdev, errp); | |
160 | } | |
161 | } | |
162 | ||
3149f183 PD |
163 | static void xen_block_set_size(XenBlockDevice *blockdev) |
164 | { | |
165 | const char *type = object_get_typename(OBJECT(blockdev)); | |
166 | XenBlockVdev *vdev = &blockdev->props.vdev; | |
167 | BlockConf *conf = &blockdev->props.conf; | |
5feeb718 | 168 | int64_t sectors = blk_getlength(conf->blk) / conf->logical_block_size; |
3149f183 PD |
169 | XenDevice *xendev = XEN_DEVICE(blockdev); |
170 | ||
171 | trace_xen_block_size(type, vdev->disk, vdev->partition, sectors); | |
172 | ||
173 | xen_device_backend_printf(xendev, "sectors", "%"PRIi64, sectors); | |
174 | } | |
175 | ||
176 | static void xen_block_resize_cb(void *opaque) | |
177 | { | |
178 | XenBlockDevice *blockdev = opaque; | |
179 | XenDevice *xendev = XEN_DEVICE(blockdev); | |
180 | enum xenbus_state state = xen_device_backend_get_state(xendev); | |
181 | ||
182 | xen_block_set_size(blockdev); | |
183 | ||
184 | /* | |
185 | * Mimic the behaviour of Linux xen-blkback and re-write the state | |
186 | * to trigger the frontend watch. | |
187 | */ | |
188 | xen_device_backend_printf(xendev, "state", "%u", state); | |
189 | } | |
190 | ||
191 | static const BlockDevOps xen_block_dev_ops = { | |
192 | .resize_cb = xen_block_resize_cb, | |
193 | }; | |
194 | ||
1a72d9ae PD |
195 | static void xen_block_realize(XenDevice *xendev, Error **errp) |
196 | { | |
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; | |
b6af8926 | 202 | BlockConf *conf = &blockdev->props.conf; |
5feeb718 | 203 | BlockBackend *blk = conf->blk; |
1a72d9ae PD |
204 | Error *local_err = NULL; |
205 | ||
206 | if (vdev->type == XEN_BLOCK_VDEV_TYPE_INVALID) { | |
207 | error_setg(errp, "vdev property not set"); | |
208 | return; | |
209 | } | |
210 | ||
211 | trace_xen_block_realize(type, vdev->disk, vdev->partition); | |
212 | ||
213 | if (blockdev_class->realize) { | |
214 | blockdev_class->realize(blockdev, &local_err); | |
215 | if (local_err) { | |
216 | error_propagate(errp, local_err); | |
b6af8926 | 217 | return; |
1a72d9ae PD |
218 | } |
219 | } | |
b6af8926 PD |
220 | |
221 | /* | |
222 | * The blkif protocol does not deal with removable media, so it must | |
223 | * always be present, even for CDRom devices. | |
224 | */ | |
5feeb718 PD |
225 | assert(blk); |
226 | if (!blk_is_inserted(blk)) { | |
b6af8926 PD |
227 | error_setg(errp, "device needs media, but drive is empty"); |
228 | return; | |
229 | } | |
230 | ||
231 | if (!blkconf_apply_backend_options(conf, blockdev->info & VDISK_READONLY, | |
3149f183 | 232 | true, errp)) { |
b6af8926 PD |
233 | return; |
234 | } | |
235 | ||
236 | if (!(blockdev->info & VDISK_CDROM) && | |
237 | !blkconf_geometry(conf, NULL, 65535, 255, 255, errp)) { | |
238 | return; | |
239 | } | |
240 | ||
241 | blkconf_blocksizes(conf); | |
242 | ||
243 | if (conf->logical_block_size > conf->physical_block_size) { | |
244 | error_setg( | |
245 | errp, "logical_block_size > physical_block_size not supported"); | |
246 | return; | |
247 | } | |
248 | ||
5feeb718 PD |
249 | blk_set_dev_ops(blk, &xen_block_dev_ops, blockdev); |
250 | blk_set_guest_block_size(blk, conf->logical_block_size); | |
b6af8926 | 251 | |
15f08450 PD |
252 | if (conf->discard_granularity == -1) { |
253 | conf->discard_granularity = conf->physical_block_size; | |
254 | } | |
255 | ||
5feeb718 | 256 | if (blk_get_flags(blk) & BDRV_O_UNMAP) { |
b6af8926 | 257 | xen_device_backend_printf(xendev, "feature-discard", "%u", 1); |
15f08450 PD |
258 | xen_device_backend_printf(xendev, "discard-granularity", "%u", |
259 | conf->discard_granularity); | |
b6af8926 PD |
260 | } |
261 | ||
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); | |
266 | ||
267 | xen_device_frontend_printf(xendev, "virtual-device", "%lu", | |
268 | vdev->number); | |
269 | xen_device_frontend_printf(xendev, "device-type", "%s", | |
270 | blockdev->device_type); | |
271 | ||
272 | xen_device_backend_printf(xendev, "sector-size", "%u", | |
5feeb718 | 273 | conf->logical_block_size); |
3149f183 PD |
274 | |
275 | xen_block_set_size(blockdev); | |
b6af8926 PD |
276 | |
277 | blockdev->dataplane = | |
5feeb718 PD |
278 | xen_block_dataplane_create(xendev, blk, conf->logical_block_size, |
279 | blockdev->props.iothread); | |
1a72d9ae PD |
280 | } |
281 | ||
82a29e30 PD |
282 | static void xen_block_frontend_changed(XenDevice *xendev, |
283 | enum xenbus_state frontend_state, | |
284 | Error **errp) | |
285 | { | |
286 | enum xenbus_state backend_state = xen_device_backend_get_state(xendev); | |
287 | Error *local_err = NULL; | |
288 | ||
289 | switch (frontend_state) { | |
290 | case XenbusStateInitialised: | |
291 | case XenbusStateConnected: | |
292 | if (backend_state == XenbusStateConnected) { | |
293 | break; | |
294 | } | |
295 | ||
296 | xen_block_disconnect(xendev, &local_err); | |
297 | if (local_err) { | |
298 | error_propagate(errp, local_err); | |
299 | break; | |
300 | } | |
301 | ||
302 | xen_block_connect(xendev, &local_err); | |
303 | if (local_err) { | |
304 | error_propagate(errp, local_err); | |
305 | break; | |
306 | } | |
307 | ||
308 | xen_device_backend_set_state(xendev, XenbusStateConnected); | |
309 | break; | |
310 | ||
311 | case XenbusStateClosing: | |
312 | xen_device_backend_set_state(xendev, XenbusStateClosing); | |
313 | break; | |
314 | ||
315 | case XenbusStateClosed: | |
ef916ab3 | 316 | case XenbusStateUnknown: |
82a29e30 PD |
317 | xen_block_disconnect(xendev, &local_err); |
318 | if (local_err) { | |
319 | error_propagate(errp, local_err); | |
320 | break; | |
321 | } | |
322 | ||
323 | xen_device_backend_set_state(xendev, XenbusStateClosed); | |
324 | break; | |
325 | ||
326 | default: | |
327 | break; | |
328 | } | |
329 | } | |
330 | ||
1a72d9ae PD |
331 | static char *disk_to_vbd_name(unsigned int disk) |
332 | { | |
333 | char *name, *prefix = (disk >= 26) ? | |
334 | disk_to_vbd_name((disk / 26) - 1) : g_strdup(""); | |
335 | ||
336 | name = g_strdup_printf("%s%c", prefix, 'a' + disk % 26); | |
337 | g_free(prefix); | |
338 | ||
339 | return name; | |
340 | } | |
341 | ||
342 | static void xen_block_get_vdev(Object *obj, Visitor *v, const char *name, | |
343 | void *opaque, Error **errp) | |
344 | { | |
345 | DeviceState *dev = DEVICE(obj); | |
346 | Property *prop = opaque; | |
347 | XenBlockVdev *vdev = qdev_get_prop_ptr(dev, prop); | |
348 | char *str; | |
349 | ||
350 | switch (vdev->type) { | |
351 | case XEN_BLOCK_VDEV_TYPE_DP: | |
352 | str = g_strdup_printf("d%lup%lu", vdev->disk, vdev->partition); | |
353 | break; | |
354 | ||
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); | |
359 | ||
360 | str = g_strdup_printf("%s%s%lu", | |
361 | (vdev->type == XEN_BLOCK_VDEV_TYPE_XVD) ? | |
362 | "xvd" : | |
363 | (vdev->type == XEN_BLOCK_VDEV_TYPE_HD) ? | |
364 | "hd" : | |
365 | "sd", | |
366 | name, vdev->partition); | |
367 | g_free(name); | |
368 | break; | |
369 | } | |
370 | default: | |
371 | error_setg(errp, "invalid vdev type"); | |
372 | return; | |
373 | } | |
374 | ||
375 | visit_type_str(v, name, &str, errp); | |
376 | g_free(str); | |
377 | } | |
378 | ||
2ae23f0e PD |
379 | static int vbd_name_to_disk(const char *name, const char **endp, |
380 | unsigned long *disk) | |
1a72d9ae | 381 | { |
2ae23f0e | 382 | unsigned int n = 0; |
1a72d9ae PD |
383 | |
384 | while (*name != '\0') { | |
385 | if (!g_ascii_isalpha(*name) || !g_ascii_islower(*name)) { | |
386 | break; | |
387 | } | |
388 | ||
2ae23f0e PD |
389 | n *= 26; |
390 | n += *name++ - 'a' + 1; | |
1a72d9ae PD |
391 | } |
392 | *endp = name; | |
393 | ||
2ae23f0e PD |
394 | if (!n) { |
395 | return -1; | |
396 | } | |
397 | ||
398 | *disk = n - 1; | |
399 | ||
400 | return 0; | |
1a72d9ae PD |
401 | } |
402 | ||
403 | static void xen_block_set_vdev(Object *obj, Visitor *v, const char *name, | |
404 | void *opaque, Error **errp) | |
405 | { | |
406 | DeviceState *dev = DEVICE(obj); | |
407 | Property *prop = opaque; | |
408 | XenBlockVdev *vdev = qdev_get_prop_ptr(dev, prop); | |
409 | Error *local_err = NULL; | |
410 | char *str, *p; | |
411 | const char *end; | |
412 | ||
413 | if (dev->realized) { | |
414 | qdev_prop_set_after_realize(dev, name, errp); | |
415 | return; | |
416 | } | |
417 | ||
418 | visit_type_str(v, name, &str, &local_err); | |
419 | if (local_err) { | |
420 | error_propagate(errp, local_err); | |
421 | return; | |
422 | } | |
423 | ||
424 | p = strchr(str, 'd'); | |
425 | if (!p) { | |
426 | goto invalid; | |
427 | } | |
428 | ||
429 | *p++ = '\0'; | |
430 | if (*str == '\0') { | |
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; | |
438 | } else { | |
439 | goto invalid; | |
440 | } | |
441 | ||
442 | if (vdev->type == XEN_BLOCK_VDEV_TYPE_DP) { | |
443 | if (qemu_strtoul(p, &end, 10, &vdev->disk)) { | |
444 | goto invalid; | |
445 | } | |
446 | ||
447 | if (*end == 'p') { | |
210b9776 | 448 | if (*(++end) == '\0') { |
1a72d9ae PD |
449 | goto invalid; |
450 | } | |
451 | } | |
452 | } else { | |
2ae23f0e PD |
453 | if (vbd_name_to_disk(p, &end, &vdev->disk)) { |
454 | goto invalid; | |
455 | } | |
1a72d9ae PD |
456 | } |
457 | ||
458 | if (*end != '\0') { | |
459 | p = (char *)end; | |
460 | ||
461 | if (qemu_strtoul(p, &end, 10, &vdev->partition)) { | |
462 | goto invalid; | |
463 | } | |
464 | ||
465 | if (*end != '\0') { | |
466 | goto invalid; | |
467 | } | |
468 | } else { | |
469 | vdev->partition = 0; | |
470 | } | |
471 | ||
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) | | |
477 | vdev->partition; | |
478 | } else if (vdev->disk < (1 << 20) && vdev->partition < (1 << 8)) { | |
479 | vdev->number = (1 << 28) | (vdev->disk << 8) | | |
480 | vdev->partition; | |
481 | } else { | |
482 | goto invalid; | |
483 | } | |
484 | break; | |
485 | ||
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) | | |
493 | vdev->partition; | |
494 | } else { | |
495 | goto invalid; | |
496 | } | |
497 | break; | |
498 | ||
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; | |
502 | } else { | |
503 | goto invalid; | |
504 | } | |
505 | break; | |
506 | ||
507 | default: | |
508 | goto invalid; | |
509 | } | |
510 | ||
511 | g_free(str); | |
512 | return; | |
513 | ||
514 | invalid: | |
515 | error_setg(errp, "invalid virtual disk specifier"); | |
516 | ||
517 | vdev->type = XEN_BLOCK_VDEV_TYPE_INVALID; | |
518 | g_free(str); | |
519 | } | |
520 | ||
521 | /* | |
522 | * This property deals with 'vdev' names adhering to the Xen VBD naming | |
523 | * scheme described in: | |
524 | * | |
525 | * https://xenbits.xen.org/docs/unstable/man/xen-vbd-interface.7.html | |
526 | */ | |
527 | const PropertyInfo xen_block_prop_vdev = { | |
528 | .name = "str", | |
529 | .description = "Virtual Disk specifier: d*p*/xvd*/hd*/sd*", | |
530 | .get = xen_block_get_vdev, | |
531 | .set = xen_block_set_vdev, | |
532 | }; | |
533 | ||
534 | static Property xen_block_props[] = { | |
535 | DEFINE_PROP("vdev", XenBlockDevice, props.vdev, | |
536 | xen_block_prop_vdev, XenBlockVdev), | |
b6af8926 PD |
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 *), | |
1a72d9ae PD |
542 | DEFINE_PROP_END_OF_LIST() |
543 | }; | |
544 | ||
545 | static void xen_block_class_init(ObjectClass *class, void *data) | |
546 | { | |
547 | DeviceClass *dev_class = DEVICE_CLASS(class); | |
548 | XenDeviceClass *xendev_class = XEN_DEVICE_CLASS(class); | |
549 | ||
db9ff46e | 550 | xendev_class->backend = "qdisk"; |
b6af8926 | 551 | xendev_class->device = "vbd"; |
094a2239 | 552 | xendev_class->get_name = xen_block_get_name; |
1a72d9ae | 553 | xendev_class->realize = xen_block_realize; |
82a29e30 | 554 | xendev_class->frontend_changed = xen_block_frontend_changed; |
1a72d9ae PD |
555 | xendev_class->unrealize = xen_block_unrealize; |
556 | ||
557 | dev_class->props = xen_block_props; | |
558 | } | |
559 | ||
560 | static const TypeInfo xen_block_type_info = { | |
561 | .name = TYPE_XEN_BLOCK_DEVICE, | |
562 | .parent = TYPE_XEN_DEVICE, | |
563 | .instance_size = sizeof(XenBlockDevice), | |
564 | .abstract = true, | |
565 | .class_size = sizeof(XenBlockDeviceClass), | |
566 | .class_init = xen_block_class_init, | |
567 | }; | |
568 | ||
569 | static void xen_disk_unrealize(XenBlockDevice *blockdev, Error **errp) | |
570 | { | |
571 | trace_xen_disk_unrealize(); | |
572 | } | |
573 | ||
574 | static void xen_disk_realize(XenBlockDevice *blockdev, Error **errp) | |
575 | { | |
b6af8926 PD |
576 | BlockConf *conf = &blockdev->props.conf; |
577 | ||
1a72d9ae | 578 | trace_xen_disk_realize(); |
b6af8926 PD |
579 | |
580 | blockdev->device_type = "disk"; | |
581 | ||
582 | if (!conf->blk) { | |
583 | error_setg(errp, "drive property not set"); | |
584 | return; | |
585 | } | |
586 | ||
587 | blockdev->info = blk_is_read_only(conf->blk) ? VDISK_READONLY : 0; | |
1a72d9ae PD |
588 | } |
589 | ||
590 | static void xen_disk_class_init(ObjectClass *class, void *data) | |
591 | { | |
592 | DeviceClass *dev_class = DEVICE_CLASS(class); | |
593 | XenBlockDeviceClass *blockdev_class = XEN_BLOCK_DEVICE_CLASS(class); | |
594 | ||
595 | blockdev_class->realize = xen_disk_realize; | |
596 | blockdev_class->unrealize = xen_disk_unrealize; | |
597 | ||
598 | dev_class->desc = "Xen Disk Device"; | |
599 | } | |
600 | ||
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, | |
606 | }; | |
607 | ||
608 | static void xen_cdrom_unrealize(XenBlockDevice *blockdev, Error **errp) | |
609 | { | |
610 | trace_xen_cdrom_unrealize(); | |
611 | } | |
612 | ||
613 | static void xen_cdrom_realize(XenBlockDevice *blockdev, Error **errp) | |
614 | { | |
b6af8926 PD |
615 | BlockConf *conf = &blockdev->props.conf; |
616 | ||
1a72d9ae | 617 | trace_xen_cdrom_realize(); |
b6af8926 PD |
618 | |
619 | blockdev->device_type = "cdrom"; | |
620 | ||
621 | if (!conf->blk) { | |
622 | int rc; | |
623 | ||
624 | /* Set up an empty drive */ | |
d861ab3a | 625 | conf->blk = blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL); |
b6af8926 PD |
626 | |
627 | rc = blk_attach_dev(conf->blk, DEVICE(blockdev)); | |
628 | if (!rc) { | |
629 | error_setg_errno(errp, -rc, "failed to create drive"); | |
630 | return; | |
631 | } | |
632 | } | |
633 | ||
634 | blockdev->info = VDISK_READONLY | VDISK_CDROM; | |
1a72d9ae PD |
635 | } |
636 | ||
637 | static void xen_cdrom_class_init(ObjectClass *class, void *data) | |
638 | { | |
639 | DeviceClass *dev_class = DEVICE_CLASS(class); | |
640 | XenBlockDeviceClass *blockdev_class = XEN_BLOCK_DEVICE_CLASS(class); | |
641 | ||
642 | blockdev_class->realize = xen_cdrom_realize; | |
643 | blockdev_class->unrealize = xen_cdrom_unrealize; | |
644 | ||
645 | dev_class->desc = "Xen CD-ROM Device"; | |
646 | } | |
647 | ||
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, | |
653 | }; | |
654 | ||
655 | static void xen_block_register_types(void) | |
656 | { | |
657 | type_register_static(&xen_block_type_info); | |
658 | type_register_static(&xen_disk_type_info); | |
659 | type_register_static(&xen_cdrom_type_info); | |
660 | } | |
661 | ||
662 | type_init(xen_block_register_types) | |
db9ff46e PD |
663 | |
664 | static void xen_block_blockdev_del(const char *node_name, Error **errp) | |
665 | { | |
666 | trace_xen_block_blockdev_del(node_name); | |
667 | ||
668 | qmp_blockdev_del(node_name, errp); | |
669 | } | |
670 | ||
671 | static char *xen_block_blockdev_add(const char *id, QDict *qdict, | |
672 | Error **errp) | |
673 | { | |
674 | const char *driver = qdict_get_try_str(qdict, "driver"); | |
675 | BlockdevOptions *options = NULL; | |
676 | Error *local_err = NULL; | |
677 | char *node_name; | |
678 | Visitor *v; | |
679 | ||
680 | if (!driver) { | |
681 | error_setg(errp, "no 'driver' parameter"); | |
682 | return NULL; | |
683 | } | |
684 | ||
685 | node_name = g_strdup_printf("%s-%s", id, driver); | |
686 | qdict_put_str(qdict, "node-name", node_name); | |
687 | ||
688 | trace_xen_block_blockdev_add(node_name); | |
689 | ||
690 | v = qobject_input_visitor_new(QOBJECT(qdict)); | |
691 | visit_type_BlockdevOptions(v, NULL, &options, &local_err); | |
692 | visit_free(v); | |
693 | ||
694 | if (local_err) { | |
695 | error_propagate(errp, local_err); | |
696 | goto fail; | |
697 | } | |
698 | ||
699 | qmp_blockdev_add(options, &local_err); | |
700 | ||
701 | if (local_err) { | |
702 | error_propagate(errp, local_err); | |
703 | goto fail; | |
704 | } | |
705 | ||
706 | qapi_free_BlockdevOptions(options); | |
707 | ||
708 | return node_name; | |
709 | ||
710 | fail: | |
711 | if (options) { | |
712 | qapi_free_BlockdevOptions(options); | |
713 | } | |
714 | g_free(node_name); | |
715 | ||
716 | return NULL; | |
717 | } | |
718 | ||
719 | static void xen_block_drive_destroy(XenBlockDrive *drive, Error **errp) | |
720 | { | |
721 | char *node_name = drive->node_name; | |
722 | ||
723 | if (node_name) { | |
724 | Error *local_err = NULL; | |
725 | ||
726 | xen_block_blockdev_del(node_name, &local_err); | |
727 | if (local_err) { | |
728 | error_propagate(errp, local_err); | |
729 | return; | |
730 | } | |
731 | g_free(node_name); | |
732 | drive->node_name = NULL; | |
733 | } | |
734 | g_free(drive->id); | |
735 | g_free(drive); | |
736 | } | |
737 | ||
738 | static XenBlockDrive *xen_block_drive_create(const char *id, | |
739 | const char *device_type, | |
740 | QDict *opts, Error **errp) | |
741 | { | |
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"); | |
746 | char *driver = NULL; | |
747 | char *filename = NULL; | |
748 | XenBlockDrive *drive = NULL; | |
749 | Error *local_err = NULL; | |
750 | QDict *file_layer; | |
751 | QDict *driver_layer; | |
752 | ||
753 | if (params) { | |
754 | char **v = g_strsplit(params, ":", 2); | |
755 | ||
756 | if (v[1] == NULL) { | |
757 | filename = g_strdup(v[0]); | |
758 | driver = g_strdup("raw"); | |
759 | } else { | |
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"); | |
764 | } else { | |
765 | driver = g_strdup(v[0]); | |
766 | } | |
767 | filename = g_strdup(v[1]); | |
768 | } | |
769 | ||
770 | g_strfreev(v); | |
156ac944 PD |
771 | } else { |
772 | error_setg(errp, "no params"); | |
db9ff46e PD |
773 | goto done; |
774 | } | |
156ac944 PD |
775 | |
776 | assert(filename); | |
db9ff46e PD |
777 | assert(driver); |
778 | ||
779 | drive = g_new0(XenBlockDrive, 1); | |
780 | drive->id = g_strdup(id); | |
781 | ||
782 | file_layer = qdict_new(); | |
15f08450 | 783 | driver_layer = qdict_new(); |
db9ff46e PD |
784 | |
785 | qdict_put_str(file_layer, "driver", "file"); | |
786 | qdict_put_str(file_layer, "filename", filename); | |
156ac944 | 787 | g_free(filename); |
db9ff46e PD |
788 | |
789 | if (mode && *mode != 'w') { | |
790 | qdict_put_bool(file_layer, "read-only", true); | |
791 | } | |
792 | ||
793 | if (direct_io_safe) { | |
794 | unsigned long value; | |
795 | ||
796 | if (!qemu_strtoul(direct_io_safe, NULL, 2, &value) && !!value) { | |
797 | QDict *cache_qdict = qdict_new(); | |
798 | ||
799 | qdict_put_bool(cache_qdict, "direct", true); | |
ad85b0b4 | 800 | qdict_put(file_layer, "cache", cache_qdict); |
db9ff46e PD |
801 | |
802 | qdict_put_str(file_layer, "aio", "native"); | |
803 | } | |
804 | } | |
805 | ||
806 | if (discard_enable) { | |
807 | unsigned long value; | |
808 | ||
809 | if (!qemu_strtoul(discard_enable, NULL, 2, &value) && !!value) { | |
810 | qdict_put_str(file_layer, "discard", "unmap"); | |
15f08450 | 811 | qdict_put_str(driver_layer, "discard", "unmap"); |
db9ff46e PD |
812 | } |
813 | } | |
814 | ||
815 | /* | |
816 | * It is necessary to turn file locking off as an emulated device | |
817 | * may have already opened the same image file. | |
818 | */ | |
819 | qdict_put_str(file_layer, "locking", "off"); | |
820 | ||
db9ff46e | 821 | qdict_put_str(driver_layer, "driver", driver); |
156ac944 PD |
822 | g_free(driver); |
823 | ||
ad85b0b4 | 824 | qdict_put(driver_layer, "file", file_layer); |
db9ff46e PD |
825 | |
826 | g_assert(!drive->node_name); | |
827 | drive->node_name = xen_block_blockdev_add(drive->id, driver_layer, | |
828 | &local_err); | |
829 | ||
156ac944 | 830 | qobject_unref(driver_layer); |
db9ff46e | 831 | |
156ac944 | 832 | done: |
db9ff46e PD |
833 | if (local_err) { |
834 | error_propagate(errp, local_err); | |
835 | xen_block_drive_destroy(drive, NULL); | |
836 | return NULL; | |
837 | } | |
838 | ||
839 | return drive; | |
840 | } | |
841 | ||
842 | static const char *xen_block_drive_get_node_name(XenBlockDrive *drive) | |
843 | { | |
844 | return drive->node_name ? drive->node_name : ""; | |
845 | } | |
846 | ||
847 | static void xen_block_iothread_destroy(XenBlockIOThread *iothread, | |
848 | Error **errp) | |
849 | { | |
850 | qmp_object_del(iothread->id, errp); | |
851 | ||
852 | g_free(iothread->id); | |
853 | g_free(iothread); | |
854 | } | |
855 | ||
856 | static XenBlockIOThread *xen_block_iothread_create(const char *id, | |
857 | Error **errp) | |
858 | { | |
859 | XenBlockIOThread *iothread = g_new(XenBlockIOThread, 1); | |
860 | Error *local_err = NULL; | |
861 | ||
862 | iothread->id = g_strdup(id); | |
863 | ||
864 | qmp_object_add(TYPE_IOTHREAD, id, false, NULL, &local_err); | |
865 | if (local_err) { | |
866 | error_propagate(errp, local_err); | |
867 | ||
868 | g_free(iothread->id); | |
869 | g_free(iothread); | |
870 | return NULL; | |
871 | } | |
872 | ||
873 | return iothread; | |
874 | } | |
875 | ||
876 | static void xen_block_device_create(XenBackendInstance *backend, | |
877 | QDict *opts, Error **errp) | |
878 | { | |
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; | |
887 | const char *type; | |
888 | XenBlockDevice *blockdev; | |
889 | ||
890 | if (qemu_strtoul(name, NULL, 10, &number)) { | |
891 | error_setg(errp, "failed to parse name '%s'", name); | |
892 | goto fail; | |
893 | } | |
894 | ||
895 | trace_xen_block_device_create(number); | |
896 | ||
897 | vdev = qdict_get_try_str(opts, "dev"); | |
898 | if (!vdev) { | |
899 | error_setg(errp, "no dev parameter"); | |
900 | goto fail; | |
901 | } | |
902 | ||
903 | device_type = qdict_get_try_str(opts, "device-type"); | |
904 | if (!device_type) { | |
905 | error_setg(errp, "no device-type parameter"); | |
906 | goto fail; | |
907 | } | |
908 | ||
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; | |
913 | } else { | |
914 | error_setg(errp, "invalid device-type parameter '%s'", device_type); | |
915 | goto fail; | |
916 | } | |
917 | ||
918 | drive = xen_block_drive_create(vdev, device_type, opts, &local_err); | |
919 | if (!drive) { | |
920 | error_propagate_prepend(errp, local_err, "failed to create drive: "); | |
921 | goto fail; | |
922 | } | |
923 | ||
924 | iothread = xen_block_iothread_create(vdev, &local_err); | |
925 | if (local_err) { | |
926 | error_propagate_prepend(errp, local_err, | |
927 | "failed to create iothread: "); | |
928 | goto fail; | |
929 | } | |
930 | ||
931 | xendev = XEN_DEVICE(qdev_create(BUS(xenbus), type)); | |
932 | blockdev = XEN_BLOCK_DEVICE(xendev); | |
933 | ||
934 | object_property_set_str(OBJECT(xendev), vdev, "vdev", &local_err); | |
935 | if (local_err) { | |
936 | error_propagate_prepend(errp, local_err, "failed to set 'vdev': "); | |
937 | goto fail; | |
938 | } | |
939 | ||
940 | object_property_set_str(OBJECT(xendev), | |
941 | xen_block_drive_get_node_name(drive), "drive", | |
942 | &local_err); | |
943 | if (local_err) { | |
944 | error_propagate_prepend(errp, local_err, "failed to set 'drive': "); | |
945 | goto fail; | |
946 | } | |
947 | ||
948 | object_property_set_str(OBJECT(xendev), iothread->id, "iothread", | |
949 | &local_err); | |
950 | if (local_err) { | |
951 | error_propagate_prepend(errp, local_err, | |
952 | "failed to set 'iothread': "); | |
953 | goto fail; | |
954 | } | |
955 | ||
956 | blockdev->iothread = iothread; | |
957 | blockdev->drive = drive; | |
958 | ||
959 | object_property_set_bool(OBJECT(xendev), true, "realized", &local_err); | |
960 | if (local_err) { | |
961 | error_propagate_prepend(errp, local_err, | |
962 | "realization of device %s failed: ", | |
963 | type); | |
964 | goto fail; | |
965 | } | |
966 | ||
967 | xen_backend_set_device(backend, xendev); | |
968 | return; | |
969 | ||
970 | fail: | |
971 | if (xendev) { | |
972 | object_unparent(OBJECT(xendev)); | |
973 | } | |
974 | ||
975 | if (iothread) { | |
976 | xen_block_iothread_destroy(iothread, NULL); | |
977 | } | |
978 | ||
979 | if (drive) { | |
980 | xen_block_drive_destroy(drive, NULL); | |
981 | } | |
982 | } | |
983 | ||
984 | static void xen_block_device_destroy(XenBackendInstance *backend, | |
985 | Error **errp) | |
986 | { | |
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; | |
992 | ||
993 | trace_xen_block_device_destroy(vdev->number); | |
994 | ||
995 | object_unparent(OBJECT(xendev)); | |
996 | ||
997 | if (iothread) { | |
998 | Error *local_err = NULL; | |
999 | ||
1000 | xen_block_iothread_destroy(iothread, &local_err); | |
1001 | if (local_err) { | |
1002 | error_propagate_prepend(errp, local_err, | |
1003 | "failed to destroy iothread: "); | |
1004 | return; | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | if (drive) { | |
1009 | Error *local_err = NULL; | |
1010 | ||
1011 | xen_block_drive_destroy(drive, &local_err); | |
1012 | if (local_err) { | |
1013 | error_propagate_prepend(errp, local_err, | |
1014 | "failed to destroy drive: "); | |
1015 | } | |
1016 | } | |
1017 | } | |
1018 | ||
1019 | static const XenBackendInfo xen_block_backend_info = { | |
1020 | .type = "qdisk", | |
1021 | .create = xen_block_device_create, | |
1022 | .destroy = xen_block_device_destroy, | |
1023 | }; | |
1024 | ||
1025 | static void xen_block_register_backend(void) | |
1026 | { | |
1027 | xen_backend_register(&xen_block_backend_info); | |
1028 | } | |
1029 | ||
1030 | xen_backend_init(xen_block_register_backend); |