qdev: Drop qbus_set_bus_hotplug_handler() parameter @errp
[qemu.git] / hw / xen / xen-legacy-backend.c
1 /*
2 * xen backend driver infrastructure
3 * (c) 2008 Gerd Hoffmann <kraxel@redhat.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; under version 2 of the License.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, see <http://www.gnu.org/licenses/>.
16 *
17 * Contributions after 2012-01-13 are licensed under the terms of the
18 * GNU GPL, version 2 or (at your option) any later version.
19 */
20
21 /*
22 * TODO: add some xenbus / xenstore concepts overview here.
23 */
24
25 #include "qemu/osdep.h"
26 #include <sys/signal.h>
27
28 #include "hw/sysbus.h"
29 #include "hw/boards.h"
30 #include "hw/qdev-properties.h"
31 #include "qemu/log.h"
32 #include "qemu/main-loop.h"
33 #include "qapi/error.h"
34 #include "hw/xen/xen-legacy-backend.h"
35 #include "hw/xen/xen_pvdev.h"
36 #include "monitor/qdev.h"
37
38 DeviceState *xen_sysdev;
39 BusState *xen_sysbus;
40
41 /* ------------------------------------------------------------- */
42
43 /* public */
44 struct xs_handle *xenstore;
45 const char *xen_protocol;
46
47 /* private */
48 static bool xen_feature_grant_copy;
49 static int debug;
50
51 int xenstore_write_be_str(struct XenLegacyDevice *xendev, const char *node,
52 const char *val)
53 {
54 return xenstore_write_str(xendev->be, node, val);
55 }
56
57 int xenstore_write_be_int(struct XenLegacyDevice *xendev, const char *node,
58 int ival)
59 {
60 return xenstore_write_int(xendev->be, node, ival);
61 }
62
63 int xenstore_write_be_int64(struct XenLegacyDevice *xendev, const char *node,
64 int64_t ival)
65 {
66 return xenstore_write_int64(xendev->be, node, ival);
67 }
68
69 char *xenstore_read_be_str(struct XenLegacyDevice *xendev, const char *node)
70 {
71 return xenstore_read_str(xendev->be, node);
72 }
73
74 int xenstore_read_be_int(struct XenLegacyDevice *xendev, const char *node,
75 int *ival)
76 {
77 return xenstore_read_int(xendev->be, node, ival);
78 }
79
80 char *xenstore_read_fe_str(struct XenLegacyDevice *xendev, const char *node)
81 {
82 return xenstore_read_str(xendev->fe, node);
83 }
84
85 int xenstore_read_fe_int(struct XenLegacyDevice *xendev, const char *node,
86 int *ival)
87 {
88 return xenstore_read_int(xendev->fe, node, ival);
89 }
90
91 int xenstore_read_fe_uint64(struct XenLegacyDevice *xendev, const char *node,
92 uint64_t *uval)
93 {
94 return xenstore_read_uint64(xendev->fe, node, uval);
95 }
96
97 /* ------------------------------------------------------------- */
98
99 int xen_be_set_state(struct XenLegacyDevice *xendev, enum xenbus_state state)
100 {
101 int rc;
102
103 rc = xenstore_write_be_int(xendev, "state", state);
104 if (rc < 0) {
105 return rc;
106 }
107 xen_pv_printf(xendev, 1, "backend state: %s -> %s\n",
108 xenbus_strstate(xendev->be_state), xenbus_strstate(state));
109 xendev->be_state = state;
110 return 0;
111 }
112
113 void xen_be_set_max_grant_refs(struct XenLegacyDevice *xendev,
114 unsigned int nr_refs)
115 {
116 assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV);
117
118 if (xengnttab_set_max_grants(xendev->gnttabdev, nr_refs)) {
119 xen_pv_printf(xendev, 0, "xengnttab_set_max_grants failed: %s\n",
120 strerror(errno));
121 }
122 }
123
124 void *xen_be_map_grant_refs(struct XenLegacyDevice *xendev, uint32_t *refs,
125 unsigned int nr_refs, int prot)
126 {
127 void *ptr;
128
129 assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV);
130
131 ptr = xengnttab_map_domain_grant_refs(xendev->gnttabdev, nr_refs,
132 xen_domid, refs, prot);
133 if (!ptr) {
134 xen_pv_printf(xendev, 0,
135 "xengnttab_map_domain_grant_refs failed: %s\n",
136 strerror(errno));
137 }
138
139 return ptr;
140 }
141
142 void xen_be_unmap_grant_refs(struct XenLegacyDevice *xendev, void *ptr,
143 unsigned int nr_refs)
144 {
145 assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV);
146
147 if (xengnttab_unmap(xendev->gnttabdev, ptr, nr_refs)) {
148 xen_pv_printf(xendev, 0, "xengnttab_unmap failed: %s\n",
149 strerror(errno));
150 }
151 }
152
153 static int compat_copy_grant_refs(struct XenLegacyDevice *xendev,
154 bool to_domain,
155 XenGrantCopySegment segs[],
156 unsigned int nr_segs)
157 {
158 uint32_t *refs = g_new(uint32_t, nr_segs);
159 int prot = to_domain ? PROT_WRITE : PROT_READ;
160 void *pages;
161 unsigned int i;
162
163 for (i = 0; i < nr_segs; i++) {
164 XenGrantCopySegment *seg = &segs[i];
165
166 refs[i] = to_domain ?
167 seg->dest.foreign.ref : seg->source.foreign.ref;
168 }
169
170 pages = xengnttab_map_domain_grant_refs(xendev->gnttabdev, nr_segs,
171 xen_domid, refs, prot);
172 if (!pages) {
173 xen_pv_printf(xendev, 0,
174 "xengnttab_map_domain_grant_refs failed: %s\n",
175 strerror(errno));
176 g_free(refs);
177 return -1;
178 }
179
180 for (i = 0; i < nr_segs; i++) {
181 XenGrantCopySegment *seg = &segs[i];
182 void *page = pages + (i * XC_PAGE_SIZE);
183
184 if (to_domain) {
185 memcpy(page + seg->dest.foreign.offset, seg->source.virt,
186 seg->len);
187 } else {
188 memcpy(seg->dest.virt, page + seg->source.foreign.offset,
189 seg->len);
190 }
191 }
192
193 if (xengnttab_unmap(xendev->gnttabdev, pages, nr_segs)) {
194 xen_pv_printf(xendev, 0, "xengnttab_unmap failed: %s\n",
195 strerror(errno));
196 }
197
198 g_free(refs);
199 return 0;
200 }
201
202 int xen_be_copy_grant_refs(struct XenLegacyDevice *xendev,
203 bool to_domain,
204 XenGrantCopySegment segs[],
205 unsigned int nr_segs)
206 {
207 xengnttab_grant_copy_segment_t *xengnttab_segs;
208 unsigned int i;
209 int rc;
210
211 assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV);
212
213 if (!xen_feature_grant_copy) {
214 return compat_copy_grant_refs(xendev, to_domain, segs, nr_segs);
215 }
216
217 xengnttab_segs = g_new0(xengnttab_grant_copy_segment_t, nr_segs);
218
219 for (i = 0; i < nr_segs; i++) {
220 XenGrantCopySegment *seg = &segs[i];
221 xengnttab_grant_copy_segment_t *xengnttab_seg = &xengnttab_segs[i];
222
223 if (to_domain) {
224 xengnttab_seg->flags = GNTCOPY_dest_gref;
225 xengnttab_seg->dest.foreign.domid = xen_domid;
226 xengnttab_seg->dest.foreign.ref = seg->dest.foreign.ref;
227 xengnttab_seg->dest.foreign.offset = seg->dest.foreign.offset;
228 xengnttab_seg->source.virt = seg->source.virt;
229 } else {
230 xengnttab_seg->flags = GNTCOPY_source_gref;
231 xengnttab_seg->source.foreign.domid = xen_domid;
232 xengnttab_seg->source.foreign.ref = seg->source.foreign.ref;
233 xengnttab_seg->source.foreign.offset =
234 seg->source.foreign.offset;
235 xengnttab_seg->dest.virt = seg->dest.virt;
236 }
237
238 xengnttab_seg->len = seg->len;
239 }
240
241 rc = xengnttab_grant_copy(xendev->gnttabdev, nr_segs, xengnttab_segs);
242
243 if (rc) {
244 xen_pv_printf(xendev, 0, "xengnttab_copy failed: %s\n",
245 strerror(errno));
246 }
247
248 for (i = 0; i < nr_segs; i++) {
249 xengnttab_grant_copy_segment_t *xengnttab_seg =
250 &xengnttab_segs[i];
251
252 if (xengnttab_seg->status != GNTST_okay) {
253 xen_pv_printf(xendev, 0, "segment[%u] status: %d\n", i,
254 xengnttab_seg->status);
255 rc = -1;
256 }
257 }
258
259 g_free(xengnttab_segs);
260 return rc;
261 }
262
263 /*
264 * get xen backend device, allocate a new one if it doesn't exist.
265 */
266 static struct XenLegacyDevice *xen_be_get_xendev(const char *type, int dom,
267 int dev,
268 struct XenDevOps *ops)
269 {
270 struct XenLegacyDevice *xendev;
271
272 xendev = xen_pv_find_xendev(type, dom, dev);
273 if (xendev) {
274 return xendev;
275 }
276
277 /* init new xendev */
278 xendev = g_malloc0(ops->size);
279 object_initialize(&xendev->qdev, ops->size, TYPE_XENBACKEND);
280 OBJECT(xendev)->free = g_free;
281 qdev_set_id(DEVICE(xendev), g_strdup_printf("xen-%s-%d", type, dev));
282 qdev_realize(DEVICE(xendev), xen_sysbus, &error_fatal);
283 object_unref(OBJECT(xendev));
284
285 xendev->type = type;
286 xendev->dom = dom;
287 xendev->dev = dev;
288 xendev->ops = ops;
289
290 snprintf(xendev->be, sizeof(xendev->be), "backend/%s/%d/%d",
291 xendev->type, xendev->dom, xendev->dev);
292 snprintf(xendev->name, sizeof(xendev->name), "%s-%d",
293 xendev->type, xendev->dev);
294
295 xendev->debug = debug;
296 xendev->local_port = -1;
297
298 xendev->evtchndev = xenevtchn_open(NULL, 0);
299 if (xendev->evtchndev == NULL) {
300 xen_pv_printf(NULL, 0, "can't open evtchn device\n");
301 qdev_unplug(DEVICE(xendev), NULL);
302 return NULL;
303 }
304 qemu_set_cloexec(xenevtchn_fd(xendev->evtchndev));
305
306 xen_pv_insert_xendev(xendev);
307
308 if (xendev->ops->alloc) {
309 xendev->ops->alloc(xendev);
310 }
311
312 return xendev;
313 }
314
315
316 /*
317 * Sync internal data structures on xenstore updates.
318 * Node specifies the changed field. node = NULL means
319 * update all fields (used for initialization).
320 */
321 static void xen_be_backend_changed(struct XenLegacyDevice *xendev,
322 const char *node)
323 {
324 if (node == NULL || strcmp(node, "online") == 0) {
325 if (xenstore_read_be_int(xendev, "online", &xendev->online) == -1) {
326 xendev->online = 0;
327 }
328 }
329
330 if (node) {
331 xen_pv_printf(xendev, 2, "backend update: %s\n", node);
332 if (xendev->ops->backend_changed) {
333 xendev->ops->backend_changed(xendev, node);
334 }
335 }
336 }
337
338 static void xen_be_frontend_changed(struct XenLegacyDevice *xendev,
339 const char *node)
340 {
341 int fe_state;
342
343 if (node == NULL || strcmp(node, "state") == 0) {
344 if (xenstore_read_fe_int(xendev, "state", &fe_state) == -1) {
345 fe_state = XenbusStateUnknown;
346 }
347 if (xendev->fe_state != fe_state) {
348 xen_pv_printf(xendev, 1, "frontend state: %s -> %s\n",
349 xenbus_strstate(xendev->fe_state),
350 xenbus_strstate(fe_state));
351 }
352 xendev->fe_state = fe_state;
353 }
354 if (node == NULL || strcmp(node, "protocol") == 0) {
355 g_free(xendev->protocol);
356 xendev->protocol = xenstore_read_fe_str(xendev, "protocol");
357 if (xendev->protocol) {
358 xen_pv_printf(xendev, 1, "frontend protocol: %s\n",
359 xendev->protocol);
360 }
361 }
362
363 if (node) {
364 xen_pv_printf(xendev, 2, "frontend update: %s\n", node);
365 if (xendev->ops->frontend_changed) {
366 xendev->ops->frontend_changed(xendev, node);
367 }
368 }
369 }
370
371 /* ------------------------------------------------------------- */
372 /* Check for possible state transitions and perform them. */
373
374 /*
375 * Initial xendev setup. Read frontend path, register watch for it.
376 * Should succeed once xend finished setting up the backend device.
377 *
378 * Also sets initial state (-> Initializing) when done. Which
379 * only affects the xendev->be_state variable as xenbus should
380 * already be put into that state by xend.
381 */
382 static int xen_be_try_setup(struct XenLegacyDevice *xendev)
383 {
384 char token[XEN_BUFSIZE];
385 int be_state;
386
387 if (xenstore_read_be_int(xendev, "state", &be_state) == -1) {
388 xen_pv_printf(xendev, 0, "reading backend state failed\n");
389 return -1;
390 }
391
392 if (be_state != XenbusStateInitialising) {
393 xen_pv_printf(xendev, 0, "initial backend state is wrong (%s)\n",
394 xenbus_strstate(be_state));
395 return -1;
396 }
397
398 xendev->fe = xenstore_read_be_str(xendev, "frontend");
399 if (xendev->fe == NULL) {
400 xen_pv_printf(xendev, 0, "reading frontend path failed\n");
401 return -1;
402 }
403
404 /* setup frontend watch */
405 snprintf(token, sizeof(token), "fe:%p", xendev);
406 if (!xs_watch(xenstore, xendev->fe, token)) {
407 xen_pv_printf(xendev, 0, "watching frontend path (%s) failed\n",
408 xendev->fe);
409 return -1;
410 }
411 xen_be_set_state(xendev, XenbusStateInitialising);
412
413 xen_be_backend_changed(xendev, NULL);
414 xen_be_frontend_changed(xendev, NULL);
415 return 0;
416 }
417
418 /*
419 * Try initialize xendev. Prepare everything the backend can do
420 * without synchronizing with the frontend. Fakes hotplug-status. No
421 * hotplug involved here because this is about userspace drivers, thus
422 * there are kernel backend devices which could invoke hotplug.
423 *
424 * Goes to InitWait on success.
425 */
426 static int xen_be_try_init(struct XenLegacyDevice *xendev)
427 {
428 int rc = 0;
429
430 if (!xendev->online) {
431 xen_pv_printf(xendev, 1, "not online\n");
432 return -1;
433 }
434
435 if (xendev->ops->init) {
436 rc = xendev->ops->init(xendev);
437 }
438 if (rc != 0) {
439 xen_pv_printf(xendev, 1, "init() failed\n");
440 return rc;
441 }
442
443 xenstore_write_be_str(xendev, "hotplug-status", "connected");
444 xen_be_set_state(xendev, XenbusStateInitWait);
445 return 0;
446 }
447
448 /*
449 * Try to initialise xendev. Depends on the frontend being ready
450 * for it (shared ring and evtchn info in xenstore, state being
451 * Initialised or Connected).
452 *
453 * Goes to Connected on success.
454 */
455 static int xen_be_try_initialise(struct XenLegacyDevice *xendev)
456 {
457 int rc = 0;
458
459 if (xendev->fe_state != XenbusStateInitialised &&
460 xendev->fe_state != XenbusStateConnected) {
461 if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) {
462 xen_pv_printf(xendev, 2, "frontend not ready, ignoring\n");
463 } else {
464 xen_pv_printf(xendev, 2, "frontend not ready (yet)\n");
465 return -1;
466 }
467 }
468
469 if (xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV) {
470 xendev->gnttabdev = xengnttab_open(NULL, 0);
471 if (xendev->gnttabdev == NULL) {
472 xen_pv_printf(NULL, 0, "can't open gnttab device\n");
473 return -1;
474 }
475 } else {
476 xendev->gnttabdev = NULL;
477 }
478
479 if (xendev->ops->initialise) {
480 rc = xendev->ops->initialise(xendev);
481 }
482 if (rc != 0) {
483 xen_pv_printf(xendev, 0, "initialise() failed\n");
484 return rc;
485 }
486
487 xen_be_set_state(xendev, XenbusStateConnected);
488 return 0;
489 }
490
491 /*
492 * Try to let xendev know that it is connected. Depends on the
493 * frontend being Connected. Note that this may be called more
494 * than once since the backend state is not modified.
495 */
496 static void xen_be_try_connected(struct XenLegacyDevice *xendev)
497 {
498 if (!xendev->ops->connected) {
499 return;
500 }
501
502 if (xendev->fe_state != XenbusStateConnected) {
503 if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) {
504 xen_pv_printf(xendev, 2, "frontend not ready, ignoring\n");
505 } else {
506 xen_pv_printf(xendev, 2, "frontend not ready (yet)\n");
507 return;
508 }
509 }
510
511 xendev->ops->connected(xendev);
512 }
513
514 /*
515 * Teardown connection.
516 *
517 * Goes to Closed when done.
518 */
519 static void xen_be_disconnect(struct XenLegacyDevice *xendev,
520 enum xenbus_state state)
521 {
522 if (xendev->be_state != XenbusStateClosing &&
523 xendev->be_state != XenbusStateClosed &&
524 xendev->ops->disconnect) {
525 xendev->ops->disconnect(xendev);
526 }
527 if (xendev->gnttabdev) {
528 xengnttab_close(xendev->gnttabdev);
529 xendev->gnttabdev = NULL;
530 }
531 if (xendev->be_state != state) {
532 xen_be_set_state(xendev, state);
533 }
534 }
535
536 /*
537 * Try to reset xendev, for reconnection by another frontend instance.
538 */
539 static int xen_be_try_reset(struct XenLegacyDevice *xendev)
540 {
541 if (xendev->fe_state != XenbusStateInitialising) {
542 return -1;
543 }
544
545 xen_pv_printf(xendev, 1, "device reset (for re-connect)\n");
546 xen_be_set_state(xendev, XenbusStateInitialising);
547 return 0;
548 }
549
550 /*
551 * state change dispatcher function
552 */
553 void xen_be_check_state(struct XenLegacyDevice *xendev)
554 {
555 int rc = 0;
556
557 /* frontend may request shutdown from almost anywhere */
558 if (xendev->fe_state == XenbusStateClosing ||
559 xendev->fe_state == XenbusStateClosed) {
560 xen_be_disconnect(xendev, xendev->fe_state);
561 return;
562 }
563
564 /* check for possible backend state transitions */
565 for (;;) {
566 switch (xendev->be_state) {
567 case XenbusStateUnknown:
568 rc = xen_be_try_setup(xendev);
569 break;
570 case XenbusStateInitialising:
571 rc = xen_be_try_init(xendev);
572 break;
573 case XenbusStateInitWait:
574 rc = xen_be_try_initialise(xendev);
575 break;
576 case XenbusStateConnected:
577 /* xendev->be_state doesn't change */
578 xen_be_try_connected(xendev);
579 rc = -1;
580 break;
581 case XenbusStateClosed:
582 rc = xen_be_try_reset(xendev);
583 break;
584 default:
585 rc = -1;
586 }
587 if (rc != 0) {
588 break;
589 }
590 }
591 }
592
593 /* ------------------------------------------------------------- */
594
595 static int xenstore_scan(const char *type, int dom, struct XenDevOps *ops)
596 {
597 struct XenLegacyDevice *xendev;
598 char path[XEN_BUFSIZE], token[XEN_BUFSIZE];
599 char **dev = NULL;
600 unsigned int cdev, j;
601
602 /* setup watch */
603 snprintf(token, sizeof(token), "be:%p:%d:%p", type, dom, ops);
604 snprintf(path, sizeof(path), "backend/%s/%d", type, dom);
605 if (!xs_watch(xenstore, path, token)) {
606 xen_pv_printf(NULL, 0, "xen be: watching backend path (%s) failed\n",
607 path);
608 return -1;
609 }
610
611 /* look for backends */
612 dev = xs_directory(xenstore, 0, path, &cdev);
613 if (!dev) {
614 return 0;
615 }
616 for (j = 0; j < cdev; j++) {
617 xendev = xen_be_get_xendev(type, dom, atoi(dev[j]), ops);
618 if (xendev == NULL) {
619 continue;
620 }
621 xen_be_check_state(xendev);
622 }
623 free(dev);
624 return 0;
625 }
626
627 void xenstore_update_be(char *watch, char *type, int dom,
628 struct XenDevOps *ops)
629 {
630 struct XenLegacyDevice *xendev;
631 char path[XEN_BUFSIZE], *bepath;
632 unsigned int len, dev;
633
634 len = snprintf(path, sizeof(path), "backend/%s/%d", type, dom);
635 if (strncmp(path, watch, len) != 0) {
636 return;
637 }
638 if (sscanf(watch + len, "/%u/%255s", &dev, path) != 2) {
639 strcpy(path, "");
640 if (sscanf(watch + len, "/%u", &dev) != 1) {
641 dev = -1;
642 }
643 }
644 if (dev == -1) {
645 return;
646 }
647
648 xendev = xen_be_get_xendev(type, dom, dev, ops);
649 if (xendev != NULL) {
650 bepath = xs_read(xenstore, 0, xendev->be, &len);
651 if (bepath == NULL) {
652 xen_pv_del_xendev(xendev);
653 } else {
654 free(bepath);
655 xen_be_backend_changed(xendev, path);
656 xen_be_check_state(xendev);
657 }
658 }
659 }
660
661 void xenstore_update_fe(char *watch, struct XenLegacyDevice *xendev)
662 {
663 char *node;
664 unsigned int len;
665
666 len = strlen(xendev->fe);
667 if (strncmp(xendev->fe, watch, len) != 0) {
668 return;
669 }
670 if (watch[len] != '/') {
671 return;
672 }
673 node = watch + len + 1;
674
675 xen_be_frontend_changed(xendev, node);
676 xen_be_check_state(xendev);
677 }
678 /* -------------------------------------------------------------------- */
679
680 int xen_be_init(void)
681 {
682 xengnttab_handle *gnttabdev;
683
684 xenstore = xs_daemon_open();
685 if (!xenstore) {
686 xen_pv_printf(NULL, 0, "can't connect to xenstored\n");
687 return -1;
688 }
689
690 qemu_set_fd_handler(xs_fileno(xenstore), xenstore_update, NULL, NULL);
691
692 if (xen_xc == NULL || xen_fmem == NULL) {
693 /* Check if xen_init() have been called */
694 goto err;
695 }
696
697 gnttabdev = xengnttab_open(NULL, 0);
698 if (gnttabdev != NULL) {
699 if (xengnttab_grant_copy(gnttabdev, 0, NULL) == 0) {
700 xen_feature_grant_copy = true;
701 }
702 xengnttab_close(gnttabdev);
703 }
704
705 xen_sysdev = qdev_new(TYPE_XENSYSDEV);
706 sysbus_realize_and_unref(SYS_BUS_DEVICE(xen_sysdev), &error_fatal);
707 xen_sysbus = qbus_create(TYPE_XENSYSBUS, xen_sysdev, "xen-sysbus");
708 qbus_set_bus_hotplug_handler(xen_sysbus);
709
710 return 0;
711
712 err:
713 qemu_set_fd_handler(xs_fileno(xenstore), NULL, NULL, NULL);
714 xs_daemon_close(xenstore);
715 xenstore = NULL;
716
717 return -1;
718 }
719
720 static void xen_set_dynamic_sysbus(void)
721 {
722 Object *machine = qdev_get_machine();
723 ObjectClass *oc = object_get_class(machine);
724 MachineClass *mc = MACHINE_CLASS(oc);
725
726 machine_class_allow_dynamic_sysbus_dev(mc, TYPE_XENSYSDEV);
727 }
728
729 int xen_be_register(const char *type, struct XenDevOps *ops)
730 {
731 char path[50];
732 int rc;
733
734 if (ops->backend_register) {
735 rc = ops->backend_register();
736 if (rc) {
737 return rc;
738 }
739 }
740
741 snprintf(path, sizeof(path), "device-model/%u/backends/%s", xen_domid,
742 type);
743 xenstore_mkdir(path, XS_PERM_NONE);
744
745 return xenstore_scan(type, xen_domid, ops);
746 }
747
748 void xen_be_register_common(void)
749 {
750 xen_set_dynamic_sysbus();
751
752 xen_be_register("console", &xen_console_ops);
753 xen_be_register("vkbd", &xen_kbdmouse_ops);
754 #ifdef CONFIG_VIRTFS
755 xen_be_register("9pfs", &xen_9pfs_ops);
756 #endif
757 #ifdef CONFIG_USB_LIBUSB
758 xen_be_register("qusb", &xen_usb_ops);
759 #endif
760 }
761
762 int xen_be_bind_evtchn(struct XenLegacyDevice *xendev)
763 {
764 if (xendev->local_port != -1) {
765 return 0;
766 }
767 xendev->local_port = xenevtchn_bind_interdomain
768 (xendev->evtchndev, xendev->dom, xendev->remote_port);
769 if (xendev->local_port == -1) {
770 xen_pv_printf(xendev, 0, "xenevtchn_bind_interdomain failed\n");
771 return -1;
772 }
773 xen_pv_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port);
774 qemu_set_fd_handler(xenevtchn_fd(xendev->evtchndev),
775 xen_pv_evtchn_event, NULL, xendev);
776 return 0;
777 }
778
779
780 static Property xendev_properties[] = {
781 DEFINE_PROP_END_OF_LIST(),
782 };
783
784 static void xendev_class_init(ObjectClass *klass, void *data)
785 {
786 DeviceClass *dc = DEVICE_CLASS(klass);
787
788 device_class_set_props(dc, xendev_properties);
789 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
790 /* xen-backend devices can be plugged/unplugged dynamically */
791 dc->user_creatable = true;
792 }
793
794 static const TypeInfo xendev_type_info = {
795 .name = TYPE_XENBACKEND,
796 .parent = TYPE_XENSYSDEV,
797 .class_init = xendev_class_init,
798 .instance_size = sizeof(struct XenLegacyDevice),
799 };
800
801 static void xen_sysbus_class_init(ObjectClass *klass, void *data)
802 {
803 HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
804
805 hc->unplug = qdev_simple_device_unplug_cb;
806 }
807
808 static const TypeInfo xensysbus_info = {
809 .name = TYPE_XENSYSBUS,
810 .parent = TYPE_BUS,
811 .class_init = xen_sysbus_class_init,
812 .interfaces = (InterfaceInfo[]) {
813 { TYPE_HOTPLUG_HANDLER },
814 { }
815 }
816 };
817
818 static Property xen_sysdev_properties[] = {
819 {/* end of property list */},
820 };
821
822 static void xen_sysdev_class_init(ObjectClass *klass, void *data)
823 {
824 DeviceClass *dc = DEVICE_CLASS(klass);
825
826 device_class_set_props(dc, xen_sysdev_properties);
827 dc->bus_type = TYPE_XENSYSBUS;
828 }
829
830 static const TypeInfo xensysdev_info = {
831 .name = TYPE_XENSYSDEV,
832 .parent = TYPE_SYS_BUS_DEVICE,
833 .instance_size = sizeof(SysBusDevice),
834 .class_init = xen_sysdev_class_init,
835 };
836
837 static void xenbe_register_types(void)
838 {
839 type_register_static(&xensysbus_info);
840 type_register_static(&xensysdev_info);
841 type_register_static(&xendev_type_info);
842 }
843
844 type_init(xenbe_register_types)