hw/arm/bcm2836: Only provide "enabled-cpus" property to multicore SoCs
[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
27 #include "hw/sysbus.h"
28 #include "hw/boards.h"
29 #include "hw/qdev-properties.h"
30 #include "qemu/log.h"
31 #include "qemu/main-loop.h"
32 #include "qapi/error.h"
33 #include "hw/xen/xen-legacy-backend.h"
34 #include "hw/xen/xen_pvdev.h"
35 #include "monitor/qdev.h"
36
37 DeviceState *xen_sysdev;
38 BusState *xen_sysbus;
39
40 /* ------------------------------------------------------------- */
41
42 /* public */
43 struct xs_handle *xenstore;
44 const char *xen_protocol;
45
46 /* private */
47 static bool xen_feature_grant_copy;
48 static int debug;
49
50 int xenstore_write_be_str(struct XenLegacyDevice *xendev, const char *node,
51 const char *val)
52 {
53 return xenstore_write_str(xendev->be, node, val);
54 }
55
56 int xenstore_write_be_int(struct XenLegacyDevice *xendev, const char *node,
57 int ival)
58 {
59 return xenstore_write_int(xendev->be, node, ival);
60 }
61
62 int xenstore_write_be_int64(struct XenLegacyDevice *xendev, const char *node,
63 int64_t ival)
64 {
65 return xenstore_write_int64(xendev->be, node, ival);
66 }
67
68 char *xenstore_read_be_str(struct XenLegacyDevice *xendev, const char *node)
69 {
70 return xenstore_read_str(xendev->be, node);
71 }
72
73 int xenstore_read_be_int(struct XenLegacyDevice *xendev, const char *node,
74 int *ival)
75 {
76 return xenstore_read_int(xendev->be, node, ival);
77 }
78
79 char *xenstore_read_fe_str(struct XenLegacyDevice *xendev, const char *node)
80 {
81 return xenstore_read_str(xendev->fe, node);
82 }
83
84 int xenstore_read_fe_int(struct XenLegacyDevice *xendev, const char *node,
85 int *ival)
86 {
87 return xenstore_read_int(xendev->fe, node, ival);
88 }
89
90 int xenstore_read_fe_uint64(struct XenLegacyDevice *xendev, const char *node,
91 uint64_t *uval)
92 {
93 return xenstore_read_uint64(xendev->fe, node, uval);
94 }
95
96 /* ------------------------------------------------------------- */
97
98 int xen_be_set_state(struct XenLegacyDevice *xendev, enum xenbus_state state)
99 {
100 int rc;
101
102 rc = xenstore_write_be_int(xendev, "state", state);
103 if (rc < 0) {
104 return rc;
105 }
106 xen_pv_printf(xendev, 1, "backend state: %s -> %s\n",
107 xenbus_strstate(xendev->be_state), xenbus_strstate(state));
108 xendev->be_state = state;
109 return 0;
110 }
111
112 void xen_be_set_max_grant_refs(struct XenLegacyDevice *xendev,
113 unsigned int nr_refs)
114 {
115 assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV);
116
117 if (xengnttab_set_max_grants(xendev->gnttabdev, nr_refs)) {
118 xen_pv_printf(xendev, 0, "xengnttab_set_max_grants failed: %s\n",
119 strerror(errno));
120 }
121 }
122
123 void *xen_be_map_grant_refs(struct XenLegacyDevice *xendev, uint32_t *refs,
124 unsigned int nr_refs, int prot)
125 {
126 void *ptr;
127
128 assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV);
129
130 ptr = xengnttab_map_domain_grant_refs(xendev->gnttabdev, nr_refs,
131 xen_domid, refs, prot);
132 if (!ptr) {
133 xen_pv_printf(xendev, 0,
134 "xengnttab_map_domain_grant_refs failed: %s\n",
135 strerror(errno));
136 }
137
138 return ptr;
139 }
140
141 void xen_be_unmap_grant_refs(struct XenLegacyDevice *xendev, void *ptr,
142 unsigned int nr_refs)
143 {
144 assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV);
145
146 if (xengnttab_unmap(xendev->gnttabdev, ptr, nr_refs)) {
147 xen_pv_printf(xendev, 0, "xengnttab_unmap failed: %s\n",
148 strerror(errno));
149 }
150 }
151
152 static int compat_copy_grant_refs(struct XenLegacyDevice *xendev,
153 bool to_domain,
154 XenGrantCopySegment segs[],
155 unsigned int nr_segs)
156 {
157 uint32_t *refs = g_new(uint32_t, nr_segs);
158 int prot = to_domain ? PROT_WRITE : PROT_READ;
159 void *pages;
160 unsigned int i;
161
162 for (i = 0; i < nr_segs; i++) {
163 XenGrantCopySegment *seg = &segs[i];
164
165 refs[i] = to_domain ?
166 seg->dest.foreign.ref : seg->source.foreign.ref;
167 }
168
169 pages = xengnttab_map_domain_grant_refs(xendev->gnttabdev, nr_segs,
170 xen_domid, refs, prot);
171 if (!pages) {
172 xen_pv_printf(xendev, 0,
173 "xengnttab_map_domain_grant_refs failed: %s\n",
174 strerror(errno));
175 g_free(refs);
176 return -1;
177 }
178
179 for (i = 0; i < nr_segs; i++) {
180 XenGrantCopySegment *seg = &segs[i];
181 void *page = pages + (i * XC_PAGE_SIZE);
182
183 if (to_domain) {
184 memcpy(page + seg->dest.foreign.offset, seg->source.virt,
185 seg->len);
186 } else {
187 memcpy(seg->dest.virt, page + seg->source.foreign.offset,
188 seg->len);
189 }
190 }
191
192 if (xengnttab_unmap(xendev->gnttabdev, pages, nr_segs)) {
193 xen_pv_printf(xendev, 0, "xengnttab_unmap failed: %s\n",
194 strerror(errno));
195 }
196
197 g_free(refs);
198 return 0;
199 }
200
201 int xen_be_copy_grant_refs(struct XenLegacyDevice *xendev,
202 bool to_domain,
203 XenGrantCopySegment segs[],
204 unsigned int nr_segs)
205 {
206 xengnttab_grant_copy_segment_t *xengnttab_segs;
207 unsigned int i;
208 int rc;
209
210 assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV);
211
212 if (!xen_feature_grant_copy) {
213 return compat_copy_grant_refs(xendev, to_domain, segs, nr_segs);
214 }
215
216 xengnttab_segs = g_new0(xengnttab_grant_copy_segment_t, nr_segs);
217
218 for (i = 0; i < nr_segs; i++) {
219 XenGrantCopySegment *seg = &segs[i];
220 xengnttab_grant_copy_segment_t *xengnttab_seg = &xengnttab_segs[i];
221
222 if (to_domain) {
223 xengnttab_seg->flags = GNTCOPY_dest_gref;
224 xengnttab_seg->dest.foreign.domid = xen_domid;
225 xengnttab_seg->dest.foreign.ref = seg->dest.foreign.ref;
226 xengnttab_seg->dest.foreign.offset = seg->dest.foreign.offset;
227 xengnttab_seg->source.virt = seg->source.virt;
228 } else {
229 xengnttab_seg->flags = GNTCOPY_source_gref;
230 xengnttab_seg->source.foreign.domid = xen_domid;
231 xengnttab_seg->source.foreign.ref = seg->source.foreign.ref;
232 xengnttab_seg->source.foreign.offset =
233 seg->source.foreign.offset;
234 xengnttab_seg->dest.virt = seg->dest.virt;
235 }
236
237 xengnttab_seg->len = seg->len;
238 }
239
240 rc = xengnttab_grant_copy(xendev->gnttabdev, nr_segs, xengnttab_segs);
241
242 if (rc) {
243 xen_pv_printf(xendev, 0, "xengnttab_copy failed: %s\n",
244 strerror(errno));
245 }
246
247 for (i = 0; i < nr_segs; i++) {
248 xengnttab_grant_copy_segment_t *xengnttab_seg =
249 &xengnttab_segs[i];
250
251 if (xengnttab_seg->status != GNTST_okay) {
252 xen_pv_printf(xendev, 0, "segment[%u] status: %d\n", i,
253 xengnttab_seg->status);
254 rc = -1;
255 }
256 }
257
258 g_free(xengnttab_segs);
259 return rc;
260 }
261
262 /*
263 * get xen backend device, allocate a new one if it doesn't exist.
264 */
265 static struct XenLegacyDevice *xen_be_get_xendev(const char *type, int dom,
266 int dev,
267 struct XenDevOps *ops)
268 {
269 struct XenLegacyDevice *xendev;
270
271 xendev = xen_pv_find_xendev(type, dom, dev);
272 if (xendev) {
273 return xendev;
274 }
275
276 /* init new xendev */
277 xendev = g_malloc0(ops->size);
278 object_initialize(&xendev->qdev, ops->size, TYPE_XENBACKEND);
279 OBJECT(xendev)->free = g_free;
280 qdev_set_id(DEVICE(xendev), g_strdup_printf("xen-%s-%d", type, dev));
281 qdev_realize(DEVICE(xendev), xen_sysbus, &error_fatal);
282 object_unref(OBJECT(xendev));
283
284 xendev->type = type;
285 xendev->dom = dom;
286 xendev->dev = dev;
287 xendev->ops = ops;
288
289 snprintf(xendev->be, sizeof(xendev->be), "backend/%s/%d/%d",
290 xendev->type, xendev->dom, xendev->dev);
291 snprintf(xendev->name, sizeof(xendev->name), "%s-%d",
292 xendev->type, xendev->dev);
293
294 xendev->debug = debug;
295 xendev->local_port = -1;
296
297 xendev->evtchndev = xenevtchn_open(NULL, 0);
298 if (xendev->evtchndev == NULL) {
299 xen_pv_printf(NULL, 0, "can't open evtchn device\n");
300 qdev_unplug(DEVICE(xendev), NULL);
301 return NULL;
302 }
303 qemu_set_cloexec(xenevtchn_fd(xendev->evtchndev));
304
305 xen_pv_insert_xendev(xendev);
306
307 if (xendev->ops->alloc) {
308 xendev->ops->alloc(xendev);
309 }
310
311 return xendev;
312 }
313
314
315 /*
316 * Sync internal data structures on xenstore updates.
317 * Node specifies the changed field. node = NULL means
318 * update all fields (used for initialization).
319 */
320 static void xen_be_backend_changed(struct XenLegacyDevice *xendev,
321 const char *node)
322 {
323 if (node == NULL || strcmp(node, "online") == 0) {
324 if (xenstore_read_be_int(xendev, "online", &xendev->online) == -1) {
325 xendev->online = 0;
326 }
327 }
328
329 if (node) {
330 xen_pv_printf(xendev, 2, "backend update: %s\n", node);
331 if (xendev->ops->backend_changed) {
332 xendev->ops->backend_changed(xendev, node);
333 }
334 }
335 }
336
337 static void xen_be_frontend_changed(struct XenLegacyDevice *xendev,
338 const char *node)
339 {
340 int fe_state;
341
342 if (node == NULL || strcmp(node, "state") == 0) {
343 if (xenstore_read_fe_int(xendev, "state", &fe_state) == -1) {
344 fe_state = XenbusStateUnknown;
345 }
346 if (xendev->fe_state != fe_state) {
347 xen_pv_printf(xendev, 1, "frontend state: %s -> %s\n",
348 xenbus_strstate(xendev->fe_state),
349 xenbus_strstate(fe_state));
350 }
351 xendev->fe_state = fe_state;
352 }
353 if (node == NULL || strcmp(node, "protocol") == 0) {
354 g_free(xendev->protocol);
355 xendev->protocol = xenstore_read_fe_str(xendev, "protocol");
356 if (xendev->protocol) {
357 xen_pv_printf(xendev, 1, "frontend protocol: %s\n",
358 xendev->protocol);
359 }
360 }
361
362 if (node) {
363 xen_pv_printf(xendev, 2, "frontend update: %s\n", node);
364 if (xendev->ops->frontend_changed) {
365 xendev->ops->frontend_changed(xendev, node);
366 }
367 }
368 }
369
370 /* ------------------------------------------------------------- */
371 /* Check for possible state transitions and perform them. */
372
373 /*
374 * Initial xendev setup. Read frontend path, register watch for it.
375 * Should succeed once xend finished setting up the backend device.
376 *
377 * Also sets initial state (-> Initializing) when done. Which
378 * only affects the xendev->be_state variable as xenbus should
379 * already be put into that state by xend.
380 */
381 static int xen_be_try_setup(struct XenLegacyDevice *xendev)
382 {
383 char token[XEN_BUFSIZE];
384 int be_state;
385
386 if (xenstore_read_be_int(xendev, "state", &be_state) == -1) {
387 xen_pv_printf(xendev, 0, "reading backend state failed\n");
388 return -1;
389 }
390
391 if (be_state != XenbusStateInitialising) {
392 xen_pv_printf(xendev, 0, "initial backend state is wrong (%s)\n",
393 xenbus_strstate(be_state));
394 return -1;
395 }
396
397 xendev->fe = xenstore_read_be_str(xendev, "frontend");
398 if (xendev->fe == NULL) {
399 xen_pv_printf(xendev, 0, "reading frontend path failed\n");
400 return -1;
401 }
402
403 /* setup frontend watch */
404 snprintf(token, sizeof(token), "fe:%p", xendev);
405 if (!xs_watch(xenstore, xendev->fe, token)) {
406 xen_pv_printf(xendev, 0, "watching frontend path (%s) failed\n",
407 xendev->fe);
408 return -1;
409 }
410 xen_be_set_state(xendev, XenbusStateInitialising);
411
412 xen_be_backend_changed(xendev, NULL);
413 xen_be_frontend_changed(xendev, NULL);
414 return 0;
415 }
416
417 /*
418 * Try initialize xendev. Prepare everything the backend can do
419 * without synchronizing with the frontend. Fakes hotplug-status. No
420 * hotplug involved here because this is about userspace drivers, thus
421 * there are kernel backend devices which could invoke hotplug.
422 *
423 * Goes to InitWait on success.
424 */
425 static int xen_be_try_init(struct XenLegacyDevice *xendev)
426 {
427 int rc = 0;
428
429 if (!xendev->online) {
430 xen_pv_printf(xendev, 1, "not online\n");
431 return -1;
432 }
433
434 if (xendev->ops->init) {
435 rc = xendev->ops->init(xendev);
436 }
437 if (rc != 0) {
438 xen_pv_printf(xendev, 1, "init() failed\n");
439 return rc;
440 }
441
442 xenstore_write_be_str(xendev, "hotplug-status", "connected");
443 xen_be_set_state(xendev, XenbusStateInitWait);
444 return 0;
445 }
446
447 /*
448 * Try to initialise xendev. Depends on the frontend being ready
449 * for it (shared ring and evtchn info in xenstore, state being
450 * Initialised or Connected).
451 *
452 * Goes to Connected on success.
453 */
454 static int xen_be_try_initialise(struct XenLegacyDevice *xendev)
455 {
456 int rc = 0;
457
458 if (xendev->fe_state != XenbusStateInitialised &&
459 xendev->fe_state != XenbusStateConnected) {
460 if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) {
461 xen_pv_printf(xendev, 2, "frontend not ready, ignoring\n");
462 } else {
463 xen_pv_printf(xendev, 2, "frontend not ready (yet)\n");
464 return -1;
465 }
466 }
467
468 if (xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV) {
469 xendev->gnttabdev = xengnttab_open(NULL, 0);
470 if (xendev->gnttabdev == NULL) {
471 xen_pv_printf(NULL, 0, "can't open gnttab device\n");
472 return -1;
473 }
474 } else {
475 xendev->gnttabdev = NULL;
476 }
477
478 if (xendev->ops->initialise) {
479 rc = xendev->ops->initialise(xendev);
480 }
481 if (rc != 0) {
482 xen_pv_printf(xendev, 0, "initialise() failed\n");
483 return rc;
484 }
485
486 xen_be_set_state(xendev, XenbusStateConnected);
487 return 0;
488 }
489
490 /*
491 * Try to let xendev know that it is connected. Depends on the
492 * frontend being Connected. Note that this may be called more
493 * than once since the backend state is not modified.
494 */
495 static void xen_be_try_connected(struct XenLegacyDevice *xendev)
496 {
497 if (!xendev->ops->connected) {
498 return;
499 }
500
501 if (xendev->fe_state != XenbusStateConnected) {
502 if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) {
503 xen_pv_printf(xendev, 2, "frontend not ready, ignoring\n");
504 } else {
505 xen_pv_printf(xendev, 2, "frontend not ready (yet)\n");
506 return;
507 }
508 }
509
510 xendev->ops->connected(xendev);
511 }
512
513 /*
514 * Teardown connection.
515 *
516 * Goes to Closed when done.
517 */
518 static void xen_be_disconnect(struct XenLegacyDevice *xendev,
519 enum xenbus_state state)
520 {
521 if (xendev->be_state != XenbusStateClosing &&
522 xendev->be_state != XenbusStateClosed &&
523 xendev->ops->disconnect) {
524 xendev->ops->disconnect(xendev);
525 }
526 if (xendev->gnttabdev) {
527 xengnttab_close(xendev->gnttabdev);
528 xendev->gnttabdev = NULL;
529 }
530 if (xendev->be_state != state) {
531 xen_be_set_state(xendev, state);
532 }
533 }
534
535 /*
536 * Try to reset xendev, for reconnection by another frontend instance.
537 */
538 static int xen_be_try_reset(struct XenLegacyDevice *xendev)
539 {
540 if (xendev->fe_state != XenbusStateInitialising) {
541 return -1;
542 }
543
544 xen_pv_printf(xendev, 1, "device reset (for re-connect)\n");
545 xen_be_set_state(xendev, XenbusStateInitialising);
546 return 0;
547 }
548
549 /*
550 * state change dispatcher function
551 */
552 void xen_be_check_state(struct XenLegacyDevice *xendev)
553 {
554 int rc = 0;
555
556 /* frontend may request shutdown from almost anywhere */
557 if (xendev->fe_state == XenbusStateClosing ||
558 xendev->fe_state == XenbusStateClosed) {
559 xen_be_disconnect(xendev, xendev->fe_state);
560 return;
561 }
562
563 /* check for possible backend state transitions */
564 for (;;) {
565 switch (xendev->be_state) {
566 case XenbusStateUnknown:
567 rc = xen_be_try_setup(xendev);
568 break;
569 case XenbusStateInitialising:
570 rc = xen_be_try_init(xendev);
571 break;
572 case XenbusStateInitWait:
573 rc = xen_be_try_initialise(xendev);
574 break;
575 case XenbusStateConnected:
576 /* xendev->be_state doesn't change */
577 xen_be_try_connected(xendev);
578 rc = -1;
579 break;
580 case XenbusStateClosed:
581 rc = xen_be_try_reset(xendev);
582 break;
583 default:
584 rc = -1;
585 }
586 if (rc != 0) {
587 break;
588 }
589 }
590 }
591
592 /* ------------------------------------------------------------- */
593
594 static int xenstore_scan(const char *type, int dom, struct XenDevOps *ops)
595 {
596 struct XenLegacyDevice *xendev;
597 char path[XEN_BUFSIZE], token[XEN_BUFSIZE];
598 char **dev = NULL;
599 unsigned int cdev, j;
600
601 /* setup watch */
602 snprintf(token, sizeof(token), "be:%p:%d:%p", type, dom, ops);
603 snprintf(path, sizeof(path), "backend/%s/%d", type, dom);
604 if (!xs_watch(xenstore, path, token)) {
605 xen_pv_printf(NULL, 0, "xen be: watching backend path (%s) failed\n",
606 path);
607 return -1;
608 }
609
610 /* look for backends */
611 dev = xs_directory(xenstore, 0, path, &cdev);
612 if (!dev) {
613 return 0;
614 }
615 for (j = 0; j < cdev; j++) {
616 xendev = xen_be_get_xendev(type, dom, atoi(dev[j]), ops);
617 if (xendev == NULL) {
618 continue;
619 }
620 xen_be_check_state(xendev);
621 }
622 free(dev);
623 return 0;
624 }
625
626 void xenstore_update_be(char *watch, char *type, int dom,
627 struct XenDevOps *ops)
628 {
629 struct XenLegacyDevice *xendev;
630 char path[XEN_BUFSIZE], *bepath;
631 unsigned int len, dev;
632
633 len = snprintf(path, sizeof(path), "backend/%s/%d", type, dom);
634 if (strncmp(path, watch, len) != 0) {
635 return;
636 }
637 if (sscanf(watch + len, "/%u/%255s", &dev, path) != 2) {
638 strcpy(path, "");
639 if (sscanf(watch + len, "/%u", &dev) != 1) {
640 dev = -1;
641 }
642 }
643 if (dev == -1) {
644 return;
645 }
646
647 xendev = xen_be_get_xendev(type, dom, dev, ops);
648 if (xendev != NULL) {
649 bepath = xs_read(xenstore, 0, xendev->be, &len);
650 if (bepath == NULL) {
651 xen_pv_del_xendev(xendev);
652 } else {
653 free(bepath);
654 xen_be_backend_changed(xendev, path);
655 xen_be_check_state(xendev);
656 }
657 }
658 }
659
660 void xenstore_update_fe(char *watch, struct XenLegacyDevice *xendev)
661 {
662 char *node;
663 unsigned int len;
664
665 len = strlen(xendev->fe);
666 if (strncmp(xendev->fe, watch, len) != 0) {
667 return;
668 }
669 if (watch[len] != '/') {
670 return;
671 }
672 node = watch + len + 1;
673
674 xen_be_frontend_changed(xendev, node);
675 xen_be_check_state(xendev);
676 }
677 /* -------------------------------------------------------------------- */
678
679 int xen_be_init(void)
680 {
681 xengnttab_handle *gnttabdev;
682
683 xenstore = xs_daemon_open();
684 if (!xenstore) {
685 xen_pv_printf(NULL, 0, "can't connect to xenstored\n");
686 return -1;
687 }
688
689 qemu_set_fd_handler(xs_fileno(xenstore), xenstore_update, NULL, NULL);
690
691 if (xen_xc == NULL || xen_fmem == NULL) {
692 /* Check if xen_init() have been called */
693 goto err;
694 }
695
696 gnttabdev = xengnttab_open(NULL, 0);
697 if (gnttabdev != NULL) {
698 if (xengnttab_grant_copy(gnttabdev, 0, NULL) == 0) {
699 xen_feature_grant_copy = true;
700 }
701 xengnttab_close(gnttabdev);
702 }
703
704 xen_sysdev = qdev_new(TYPE_XENSYSDEV);
705 sysbus_realize_and_unref(SYS_BUS_DEVICE(xen_sysdev), &error_fatal);
706 xen_sysbus = qbus_create(TYPE_XENSYSBUS, xen_sysdev, "xen-sysbus");
707 qbus_set_bus_hotplug_handler(xen_sysbus);
708
709 return 0;
710
711 err:
712 qemu_set_fd_handler(xs_fileno(xenstore), NULL, NULL, NULL);
713 xs_daemon_close(xenstore);
714 xenstore = NULL;
715
716 return -1;
717 }
718
719 static void xen_set_dynamic_sysbus(void)
720 {
721 Object *machine = qdev_get_machine();
722 ObjectClass *oc = object_get_class(machine);
723 MachineClass *mc = MACHINE_CLASS(oc);
724
725 machine_class_allow_dynamic_sysbus_dev(mc, TYPE_XENSYSDEV);
726 }
727
728 int xen_be_register(const char *type, struct XenDevOps *ops)
729 {
730 char path[50];
731 int rc;
732
733 if (ops->backend_register) {
734 rc = ops->backend_register();
735 if (rc) {
736 return rc;
737 }
738 }
739
740 snprintf(path, sizeof(path), "device-model/%u/backends/%s", xen_domid,
741 type);
742 xenstore_mkdir(path, XS_PERM_NONE);
743
744 return xenstore_scan(type, xen_domid, ops);
745 }
746
747 void xen_be_register_common(void)
748 {
749 xen_set_dynamic_sysbus();
750
751 xen_be_register("console", &xen_console_ops);
752 xen_be_register("vkbd", &xen_kbdmouse_ops);
753 #ifdef CONFIG_VIRTFS
754 xen_be_register("9pfs", &xen_9pfs_ops);
755 #endif
756 #ifdef CONFIG_USB_LIBUSB
757 xen_be_register("qusb", &xen_usb_ops);
758 #endif
759 }
760
761 int xen_be_bind_evtchn(struct XenLegacyDevice *xendev)
762 {
763 if (xendev->local_port != -1) {
764 return 0;
765 }
766 xendev->local_port = xenevtchn_bind_interdomain
767 (xendev->evtchndev, xendev->dom, xendev->remote_port);
768 if (xendev->local_port == -1) {
769 xen_pv_printf(xendev, 0, "xenevtchn_bind_interdomain failed\n");
770 return -1;
771 }
772 xen_pv_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port);
773 qemu_set_fd_handler(xenevtchn_fd(xendev->evtchndev),
774 xen_pv_evtchn_event, NULL, xendev);
775 return 0;
776 }
777
778
779 static Property xendev_properties[] = {
780 DEFINE_PROP_END_OF_LIST(),
781 };
782
783 static void xendev_class_init(ObjectClass *klass, void *data)
784 {
785 DeviceClass *dc = DEVICE_CLASS(klass);
786
787 device_class_set_props(dc, xendev_properties);
788 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
789 /* xen-backend devices can be plugged/unplugged dynamically */
790 dc->user_creatable = true;
791 dc->bus_type = TYPE_XENSYSBUS;
792 }
793
794 static const TypeInfo xendev_type_info = {
795 .name = TYPE_XENBACKEND,
796 .parent = TYPE_DEVICE,
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 }
828
829 static const TypeInfo xensysdev_info = {
830 .name = TYPE_XENSYSDEV,
831 .parent = TYPE_SYS_BUS_DEVICE,
832 .instance_size = sizeof(SysBusDevice),
833 .class_init = xen_sysdev_class_init,
834 };
835
836 static void xenbe_register_types(void)
837 {
838 type_register_static(&xensysbus_info);
839 type_register_static(&xensysdev_info);
840 type_register_static(&xendev_type_info);
841 }
842
843 type_init(xenbe_register_types)