Commit | Line | Data |
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433fc58e AH |
1 | /* |
2 | * vhost transport for vsock | |
3 | * | |
4 | * Copyright (C) 2013-2015 Red Hat, Inc. | |
5 | * Author: Asias He <asias@redhat.com> | |
6 | * Stefan Hajnoczi <stefanha@redhat.com> | |
7 | * | |
8 | * This work is licensed under the terms of the GNU GPL, version 2. | |
9 | */ | |
10 | #include <linux/miscdevice.h> | |
11 | #include <linux/atomic.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/mutex.h> | |
14 | #include <linux/vmalloc.h> | |
15 | #include <net/sock.h> | |
16 | #include <linux/virtio_vsock.h> | |
17 | #include <linux/vhost.h> | |
18 | ||
19 | #include <net/af_vsock.h> | |
20 | #include "vhost.h" | |
21 | ||
22 | #define VHOST_VSOCK_DEFAULT_HOST_CID 2 | |
23 | ||
24 | enum { | |
25 | VHOST_VSOCK_FEATURES = VHOST_FEATURES, | |
26 | }; | |
27 | ||
28 | /* Used to track all the vhost_vsock instances on the system. */ | |
29 | static DEFINE_SPINLOCK(vhost_vsock_lock); | |
30 | static LIST_HEAD(vhost_vsock_list); | |
31 | ||
32 | struct vhost_vsock { | |
33 | struct vhost_dev dev; | |
34 | struct vhost_virtqueue vqs[2]; | |
35 | ||
36 | /* Link to global vhost_vsock_list, protected by vhost_vsock_lock */ | |
37 | struct list_head list; | |
38 | ||
39 | struct vhost_work send_pkt_work; | |
40 | spinlock_t send_pkt_list_lock; | |
41 | struct list_head send_pkt_list; /* host->guest pending packets */ | |
42 | ||
43 | atomic_t queued_replies; | |
44 | ||
45 | u32 guest_cid; | |
46 | }; | |
47 | ||
48 | static u32 vhost_transport_get_local_cid(void) | |
49 | { | |
50 | return VHOST_VSOCK_DEFAULT_HOST_CID; | |
51 | } | |
52 | ||
53 | static struct vhost_vsock *vhost_vsock_get(u32 guest_cid) | |
54 | { | |
55 | struct vhost_vsock *vsock; | |
56 | ||
57 | spin_lock_bh(&vhost_vsock_lock); | |
58 | list_for_each_entry(vsock, &vhost_vsock_list, list) { | |
59 | u32 other_cid = vsock->guest_cid; | |
60 | ||
61 | /* Skip instances that have no CID yet */ | |
62 | if (other_cid == 0) | |
63 | continue; | |
64 | ||
65 | if (other_cid == guest_cid) { | |
66 | spin_unlock_bh(&vhost_vsock_lock); | |
67 | return vsock; | |
68 | } | |
69 | } | |
70 | spin_unlock_bh(&vhost_vsock_lock); | |
71 | ||
72 | return NULL; | |
73 | } | |
74 | ||
75 | static void | |
76 | vhost_transport_do_send_pkt(struct vhost_vsock *vsock, | |
77 | struct vhost_virtqueue *vq) | |
78 | { | |
79 | struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX]; | |
80 | bool added = false; | |
81 | bool restart_tx = false; | |
82 | ||
83 | mutex_lock(&vq->mutex); | |
84 | ||
85 | if (!vq->private_data) | |
86 | goto out; | |
87 | ||
88 | /* Avoid further vmexits, we're already processing the virtqueue */ | |
89 | vhost_disable_notify(&vsock->dev, vq); | |
90 | ||
91 | for (;;) { | |
92 | struct virtio_vsock_pkt *pkt; | |
93 | struct iov_iter iov_iter; | |
94 | unsigned out, in; | |
95 | size_t nbytes; | |
96 | size_t len; | |
97 | int head; | |
98 | ||
99 | spin_lock_bh(&vsock->send_pkt_list_lock); | |
100 | if (list_empty(&vsock->send_pkt_list)) { | |
101 | spin_unlock_bh(&vsock->send_pkt_list_lock); | |
102 | vhost_enable_notify(&vsock->dev, vq); | |
103 | break; | |
104 | } | |
105 | ||
106 | pkt = list_first_entry(&vsock->send_pkt_list, | |
107 | struct virtio_vsock_pkt, list); | |
108 | list_del_init(&pkt->list); | |
109 | spin_unlock_bh(&vsock->send_pkt_list_lock); | |
110 | ||
111 | head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), | |
112 | &out, &in, NULL, NULL); | |
113 | if (head < 0) { | |
114 | spin_lock_bh(&vsock->send_pkt_list_lock); | |
115 | list_add(&pkt->list, &vsock->send_pkt_list); | |
116 | spin_unlock_bh(&vsock->send_pkt_list_lock); | |
117 | break; | |
118 | } | |
119 | ||
120 | if (head == vq->num) { | |
121 | spin_lock_bh(&vsock->send_pkt_list_lock); | |
122 | list_add(&pkt->list, &vsock->send_pkt_list); | |
123 | spin_unlock_bh(&vsock->send_pkt_list_lock); | |
124 | ||
125 | /* We cannot finish yet if more buffers snuck in while | |
126 | * re-enabling notify. | |
127 | */ | |
128 | if (unlikely(vhost_enable_notify(&vsock->dev, vq))) { | |
129 | vhost_disable_notify(&vsock->dev, vq); | |
130 | continue; | |
131 | } | |
132 | break; | |
133 | } | |
134 | ||
135 | if (out) { | |
136 | virtio_transport_free_pkt(pkt); | |
137 | vq_err(vq, "Expected 0 output buffers, got %u\n", out); | |
138 | break; | |
139 | } | |
140 | ||
141 | len = iov_length(&vq->iov[out], in); | |
142 | iov_iter_init(&iov_iter, READ, &vq->iov[out], in, len); | |
143 | ||
144 | nbytes = copy_to_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter); | |
145 | if (nbytes != sizeof(pkt->hdr)) { | |
146 | virtio_transport_free_pkt(pkt); | |
147 | vq_err(vq, "Faulted on copying pkt hdr\n"); | |
148 | break; | |
149 | } | |
150 | ||
151 | nbytes = copy_to_iter(pkt->buf, pkt->len, &iov_iter); | |
152 | if (nbytes != pkt->len) { | |
153 | virtio_transport_free_pkt(pkt); | |
154 | vq_err(vq, "Faulted on copying pkt buf\n"); | |
155 | break; | |
156 | } | |
157 | ||
158 | vhost_add_used(vq, head, sizeof(pkt->hdr) + pkt->len); | |
159 | added = true; | |
160 | ||
161 | if (pkt->reply) { | |
162 | int val; | |
163 | ||
164 | val = atomic_dec_return(&vsock->queued_replies); | |
165 | ||
166 | /* Do we have resources to resume tx processing? */ | |
167 | if (val + 1 == tx_vq->num) | |
168 | restart_tx = true; | |
169 | } | |
170 | ||
171 | virtio_transport_free_pkt(pkt); | |
172 | } | |
173 | if (added) | |
174 | vhost_signal(&vsock->dev, vq); | |
175 | ||
176 | out: | |
177 | mutex_unlock(&vq->mutex); | |
178 | ||
179 | if (restart_tx) | |
180 | vhost_poll_queue(&tx_vq->poll); | |
181 | } | |
182 | ||
183 | static void vhost_transport_send_pkt_work(struct vhost_work *work) | |
184 | { | |
185 | struct vhost_virtqueue *vq; | |
186 | struct vhost_vsock *vsock; | |
187 | ||
188 | vsock = container_of(work, struct vhost_vsock, send_pkt_work); | |
189 | vq = &vsock->vqs[VSOCK_VQ_RX]; | |
190 | ||
191 | vhost_transport_do_send_pkt(vsock, vq); | |
192 | } | |
193 | ||
194 | static int | |
195 | vhost_transport_send_pkt(struct virtio_vsock_pkt *pkt) | |
196 | { | |
197 | struct vhost_vsock *vsock; | |
198 | struct vhost_virtqueue *vq; | |
199 | int len = pkt->len; | |
200 | ||
201 | /* Find the vhost_vsock according to guest context id */ | |
202 | vsock = vhost_vsock_get(le64_to_cpu(pkt->hdr.dst_cid)); | |
203 | if (!vsock) { | |
204 | virtio_transport_free_pkt(pkt); | |
205 | return -ENODEV; | |
206 | } | |
207 | ||
208 | vq = &vsock->vqs[VSOCK_VQ_RX]; | |
209 | ||
210 | if (pkt->reply) | |
211 | atomic_inc(&vsock->queued_replies); | |
212 | ||
213 | spin_lock_bh(&vsock->send_pkt_list_lock); | |
214 | list_add_tail(&pkt->list, &vsock->send_pkt_list); | |
215 | spin_unlock_bh(&vsock->send_pkt_list_lock); | |
216 | ||
217 | vhost_work_queue(&vsock->dev, &vsock->send_pkt_work); | |
218 | return len; | |
219 | } | |
220 | ||
221 | static struct virtio_vsock_pkt * | |
222 | vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq, | |
223 | unsigned int out, unsigned int in) | |
224 | { | |
225 | struct virtio_vsock_pkt *pkt; | |
226 | struct iov_iter iov_iter; | |
227 | size_t nbytes; | |
228 | size_t len; | |
229 | ||
230 | if (in != 0) { | |
231 | vq_err(vq, "Expected 0 input buffers, got %u\n", in); | |
232 | return NULL; | |
233 | } | |
234 | ||
235 | pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); | |
236 | if (!pkt) | |
237 | return NULL; | |
238 | ||
239 | len = iov_length(vq->iov, out); | |
240 | iov_iter_init(&iov_iter, WRITE, vq->iov, out, len); | |
241 | ||
242 | nbytes = copy_from_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter); | |
243 | if (nbytes != sizeof(pkt->hdr)) { | |
244 | vq_err(vq, "Expected %zu bytes for pkt->hdr, got %zu bytes\n", | |
245 | sizeof(pkt->hdr), nbytes); | |
246 | kfree(pkt); | |
247 | return NULL; | |
248 | } | |
249 | ||
250 | if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_STREAM) | |
251 | pkt->len = le32_to_cpu(pkt->hdr.len); | |
252 | ||
253 | /* No payload */ | |
254 | if (!pkt->len) | |
255 | return pkt; | |
256 | ||
257 | /* The pkt is too big */ | |
258 | if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) { | |
259 | kfree(pkt); | |
260 | return NULL; | |
261 | } | |
262 | ||
263 | pkt->buf = kmalloc(pkt->len, GFP_KERNEL); | |
264 | if (!pkt->buf) { | |
265 | kfree(pkt); | |
266 | return NULL; | |
267 | } | |
268 | ||
269 | nbytes = copy_from_iter(pkt->buf, pkt->len, &iov_iter); | |
270 | if (nbytes != pkt->len) { | |
271 | vq_err(vq, "Expected %u byte payload, got %zu bytes\n", | |
272 | pkt->len, nbytes); | |
273 | virtio_transport_free_pkt(pkt); | |
274 | return NULL; | |
275 | } | |
276 | ||
277 | return pkt; | |
278 | } | |
279 | ||
280 | /* Is there space left for replies to rx packets? */ | |
281 | static bool vhost_vsock_more_replies(struct vhost_vsock *vsock) | |
282 | { | |
283 | struct vhost_virtqueue *vq = &vsock->vqs[VSOCK_VQ_TX]; | |
284 | int val; | |
285 | ||
286 | smp_rmb(); /* paired with atomic_inc() and atomic_dec_return() */ | |
287 | val = atomic_read(&vsock->queued_replies); | |
288 | ||
289 | return val < vq->num; | |
290 | } | |
291 | ||
292 | static void vhost_vsock_handle_tx_kick(struct vhost_work *work) | |
293 | { | |
294 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
295 | poll.work); | |
296 | struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, | |
297 | dev); | |
298 | struct virtio_vsock_pkt *pkt; | |
299 | int head; | |
300 | unsigned int out, in; | |
301 | bool added = false; | |
302 | ||
303 | mutex_lock(&vq->mutex); | |
304 | ||
305 | if (!vq->private_data) | |
306 | goto out; | |
307 | ||
308 | vhost_disable_notify(&vsock->dev, vq); | |
309 | for (;;) { | |
310 | if (!vhost_vsock_more_replies(vsock)) { | |
311 | /* Stop tx until the device processes already | |
312 | * pending replies. Leave tx virtqueue | |
313 | * callbacks disabled. | |
314 | */ | |
315 | goto no_more_replies; | |
316 | } | |
317 | ||
318 | head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), | |
319 | &out, &in, NULL, NULL); | |
320 | if (head < 0) | |
321 | break; | |
322 | ||
323 | if (head == vq->num) { | |
324 | if (unlikely(vhost_enable_notify(&vsock->dev, vq))) { | |
325 | vhost_disable_notify(&vsock->dev, vq); | |
326 | continue; | |
327 | } | |
328 | break; | |
329 | } | |
330 | ||
331 | pkt = vhost_vsock_alloc_pkt(vq, out, in); | |
332 | if (!pkt) { | |
333 | vq_err(vq, "Faulted on pkt\n"); | |
334 | continue; | |
335 | } | |
336 | ||
337 | /* Only accept correctly addressed packets */ | |
338 | if (le64_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid) | |
339 | virtio_transport_recv_pkt(pkt); | |
340 | else | |
341 | virtio_transport_free_pkt(pkt); | |
342 | ||
343 | vhost_add_used(vq, head, sizeof(pkt->hdr) + pkt->len); | |
344 | added = true; | |
345 | } | |
346 | ||
347 | no_more_replies: | |
348 | if (added) | |
349 | vhost_signal(&vsock->dev, vq); | |
350 | ||
351 | out: | |
352 | mutex_unlock(&vq->mutex); | |
353 | } | |
354 | ||
355 | static void vhost_vsock_handle_rx_kick(struct vhost_work *work) | |
356 | { | |
357 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
358 | poll.work); | |
359 | struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, | |
360 | dev); | |
361 | ||
362 | vhost_transport_do_send_pkt(vsock, vq); | |
363 | } | |
364 | ||
365 | static int vhost_vsock_start(struct vhost_vsock *vsock) | |
366 | { | |
367 | size_t i; | |
368 | int ret; | |
369 | ||
370 | mutex_lock(&vsock->dev.mutex); | |
371 | ||
372 | ret = vhost_dev_check_owner(&vsock->dev); | |
373 | if (ret) | |
374 | goto err; | |
375 | ||
376 | for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { | |
377 | struct vhost_virtqueue *vq = &vsock->vqs[i]; | |
378 | ||
379 | mutex_lock(&vq->mutex); | |
380 | ||
381 | if (!vhost_vq_access_ok(vq)) { | |
382 | ret = -EFAULT; | |
383 | mutex_unlock(&vq->mutex); | |
384 | goto err_vq; | |
385 | } | |
386 | ||
387 | if (!vq->private_data) { | |
388 | vq->private_data = vsock; | |
389 | vhost_vq_init_access(vq); | |
390 | } | |
391 | ||
392 | mutex_unlock(&vq->mutex); | |
393 | } | |
394 | ||
395 | mutex_unlock(&vsock->dev.mutex); | |
396 | return 0; | |
397 | ||
398 | err_vq: | |
399 | for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { | |
400 | struct vhost_virtqueue *vq = &vsock->vqs[i]; | |
401 | ||
402 | mutex_lock(&vq->mutex); | |
403 | vq->private_data = NULL; | |
404 | mutex_unlock(&vq->mutex); | |
405 | } | |
406 | err: | |
407 | mutex_unlock(&vsock->dev.mutex); | |
408 | return ret; | |
409 | } | |
410 | ||
411 | static int vhost_vsock_stop(struct vhost_vsock *vsock) | |
412 | { | |
413 | size_t i; | |
414 | int ret; | |
415 | ||
416 | mutex_lock(&vsock->dev.mutex); | |
417 | ||
418 | ret = vhost_dev_check_owner(&vsock->dev); | |
419 | if (ret) | |
420 | goto err; | |
421 | ||
422 | for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { | |
423 | struct vhost_virtqueue *vq = &vsock->vqs[i]; | |
424 | ||
425 | mutex_lock(&vq->mutex); | |
426 | vq->private_data = NULL; | |
427 | mutex_unlock(&vq->mutex); | |
428 | } | |
429 | ||
430 | err: | |
431 | mutex_unlock(&vsock->dev.mutex); | |
432 | return ret; | |
433 | } | |
434 | ||
435 | static void vhost_vsock_free(struct vhost_vsock *vsock) | |
436 | { | |
b226acab | 437 | kvfree(vsock); |
433fc58e AH |
438 | } |
439 | ||
440 | static int vhost_vsock_dev_open(struct inode *inode, struct file *file) | |
441 | { | |
442 | struct vhost_virtqueue **vqs; | |
443 | struct vhost_vsock *vsock; | |
444 | int ret; | |
445 | ||
446 | /* This struct is large and allocation could fail, fall back to vmalloc | |
447 | * if there is no other way. | |
448 | */ | |
449 | vsock = kzalloc(sizeof(*vsock), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); | |
450 | if (!vsock) { | |
451 | vsock = vmalloc(sizeof(*vsock)); | |
452 | if (!vsock) | |
453 | return -ENOMEM; | |
454 | } | |
455 | ||
456 | vqs = kmalloc_array(ARRAY_SIZE(vsock->vqs), sizeof(*vqs), GFP_KERNEL); | |
457 | if (!vqs) { | |
458 | ret = -ENOMEM; | |
459 | goto out; | |
460 | } | |
461 | ||
462 | atomic_set(&vsock->queued_replies, 0); | |
463 | ||
464 | vqs[VSOCK_VQ_TX] = &vsock->vqs[VSOCK_VQ_TX]; | |
465 | vqs[VSOCK_VQ_RX] = &vsock->vqs[VSOCK_VQ_RX]; | |
466 | vsock->vqs[VSOCK_VQ_TX].handle_kick = vhost_vsock_handle_tx_kick; | |
467 | vsock->vqs[VSOCK_VQ_RX].handle_kick = vhost_vsock_handle_rx_kick; | |
468 | ||
469 | vhost_dev_init(&vsock->dev, vqs, ARRAY_SIZE(vsock->vqs)); | |
470 | ||
471 | file->private_data = vsock; | |
472 | spin_lock_init(&vsock->send_pkt_list_lock); | |
473 | INIT_LIST_HEAD(&vsock->send_pkt_list); | |
474 | vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work); | |
475 | ||
476 | spin_lock_bh(&vhost_vsock_lock); | |
477 | list_add_tail(&vsock->list, &vhost_vsock_list); | |
478 | spin_unlock_bh(&vhost_vsock_lock); | |
479 | return 0; | |
480 | ||
481 | out: | |
482 | vhost_vsock_free(vsock); | |
483 | return ret; | |
484 | } | |
485 | ||
486 | static void vhost_vsock_flush(struct vhost_vsock *vsock) | |
487 | { | |
488 | int i; | |
489 | ||
490 | for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) | |
491 | if (vsock->vqs[i].handle_kick) | |
492 | vhost_poll_flush(&vsock->vqs[i].poll); | |
493 | vhost_work_flush(&vsock->dev, &vsock->send_pkt_work); | |
494 | } | |
495 | ||
496 | static void vhost_vsock_reset_orphans(struct sock *sk) | |
497 | { | |
498 | struct vsock_sock *vsk = vsock_sk(sk); | |
499 | ||
500 | /* vmci_transport.c doesn't take sk_lock here either. At least we're | |
501 | * under vsock_table_lock so the sock cannot disappear while we're | |
502 | * executing. | |
503 | */ | |
504 | ||
505 | if (!vhost_vsock_get(vsk->local_addr.svm_cid)) { | |
506 | sock_set_flag(sk, SOCK_DONE); | |
507 | vsk->peer_shutdown = SHUTDOWN_MASK; | |
508 | sk->sk_state = SS_UNCONNECTED; | |
509 | sk->sk_err = ECONNRESET; | |
510 | sk->sk_error_report(sk); | |
511 | } | |
512 | } | |
513 | ||
514 | static int vhost_vsock_dev_release(struct inode *inode, struct file *file) | |
515 | { | |
516 | struct vhost_vsock *vsock = file->private_data; | |
517 | ||
518 | spin_lock_bh(&vhost_vsock_lock); | |
519 | list_del(&vsock->list); | |
520 | spin_unlock_bh(&vhost_vsock_lock); | |
521 | ||
522 | /* Iterating over all connections for all CIDs to find orphans is | |
523 | * inefficient. Room for improvement here. */ | |
524 | vsock_for_each_connected_socket(vhost_vsock_reset_orphans); | |
525 | ||
526 | vhost_vsock_stop(vsock); | |
527 | vhost_vsock_flush(vsock); | |
528 | vhost_dev_stop(&vsock->dev); | |
529 | ||
530 | spin_lock_bh(&vsock->send_pkt_list_lock); | |
531 | while (!list_empty(&vsock->send_pkt_list)) { | |
532 | struct virtio_vsock_pkt *pkt; | |
533 | ||
534 | pkt = list_first_entry(&vsock->send_pkt_list, | |
535 | struct virtio_vsock_pkt, list); | |
536 | list_del_init(&pkt->list); | |
537 | virtio_transport_free_pkt(pkt); | |
538 | } | |
539 | spin_unlock_bh(&vsock->send_pkt_list_lock); | |
540 | ||
541 | vhost_dev_cleanup(&vsock->dev, false); | |
542 | kfree(vsock->dev.vqs); | |
543 | vhost_vsock_free(vsock); | |
544 | return 0; | |
545 | } | |
546 | ||
547 | static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid) | |
548 | { | |
549 | struct vhost_vsock *other; | |
550 | ||
551 | /* Refuse reserved CIDs */ | |
552 | if (guest_cid <= VMADDR_CID_HOST || | |
553 | guest_cid == U32_MAX) | |
554 | return -EINVAL; | |
555 | ||
556 | /* 64-bit CIDs are not yet supported */ | |
557 | if (guest_cid > U32_MAX) | |
558 | return -EINVAL; | |
559 | ||
560 | /* Refuse if CID is already in use */ | |
561 | other = vhost_vsock_get(guest_cid); | |
562 | if (other && other != vsock) | |
563 | return -EADDRINUSE; | |
564 | ||
565 | spin_lock_bh(&vhost_vsock_lock); | |
566 | vsock->guest_cid = guest_cid; | |
567 | spin_unlock_bh(&vhost_vsock_lock); | |
568 | ||
569 | return 0; | |
570 | } | |
571 | ||
572 | static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features) | |
573 | { | |
574 | struct vhost_virtqueue *vq; | |
575 | int i; | |
576 | ||
577 | if (features & ~VHOST_VSOCK_FEATURES) | |
578 | return -EOPNOTSUPP; | |
579 | ||
580 | mutex_lock(&vsock->dev.mutex); | |
581 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
582 | !vhost_log_access_ok(&vsock->dev)) { | |
583 | mutex_unlock(&vsock->dev.mutex); | |
584 | return -EFAULT; | |
585 | } | |
586 | ||
587 | for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { | |
588 | vq = &vsock->vqs[i]; | |
589 | mutex_lock(&vq->mutex); | |
590 | vq->acked_features = features; | |
591 | mutex_unlock(&vq->mutex); | |
592 | } | |
593 | mutex_unlock(&vsock->dev.mutex); | |
594 | return 0; | |
595 | } | |
596 | ||
597 | static long vhost_vsock_dev_ioctl(struct file *f, unsigned int ioctl, | |
598 | unsigned long arg) | |
599 | { | |
600 | struct vhost_vsock *vsock = f->private_data; | |
601 | void __user *argp = (void __user *)arg; | |
602 | u64 guest_cid; | |
603 | u64 features; | |
604 | int start; | |
605 | int r; | |
606 | ||
607 | switch (ioctl) { | |
608 | case VHOST_VSOCK_SET_GUEST_CID: | |
609 | if (copy_from_user(&guest_cid, argp, sizeof(guest_cid))) | |
610 | return -EFAULT; | |
611 | return vhost_vsock_set_cid(vsock, guest_cid); | |
612 | case VHOST_VSOCK_SET_RUNNING: | |
613 | if (copy_from_user(&start, argp, sizeof(start))) | |
614 | return -EFAULT; | |
615 | if (start) | |
616 | return vhost_vsock_start(vsock); | |
617 | else | |
618 | return vhost_vsock_stop(vsock); | |
619 | case VHOST_GET_FEATURES: | |
620 | features = VHOST_VSOCK_FEATURES; | |
621 | if (copy_to_user(argp, &features, sizeof(features))) | |
622 | return -EFAULT; | |
623 | return 0; | |
624 | case VHOST_SET_FEATURES: | |
625 | if (copy_from_user(&features, argp, sizeof(features))) | |
626 | return -EFAULT; | |
627 | return vhost_vsock_set_features(vsock, features); | |
628 | default: | |
629 | mutex_lock(&vsock->dev.mutex); | |
630 | r = vhost_dev_ioctl(&vsock->dev, ioctl, argp); | |
631 | if (r == -ENOIOCTLCMD) | |
632 | r = vhost_vring_ioctl(&vsock->dev, ioctl, argp); | |
633 | else | |
634 | vhost_vsock_flush(vsock); | |
635 | mutex_unlock(&vsock->dev.mutex); | |
636 | return r; | |
637 | } | |
638 | } | |
639 | ||
640 | static const struct file_operations vhost_vsock_fops = { | |
641 | .owner = THIS_MODULE, | |
642 | .open = vhost_vsock_dev_open, | |
643 | .release = vhost_vsock_dev_release, | |
644 | .llseek = noop_llseek, | |
645 | .unlocked_ioctl = vhost_vsock_dev_ioctl, | |
646 | }; | |
647 | ||
648 | static struct miscdevice vhost_vsock_misc = { | |
649 | .minor = MISC_DYNAMIC_MINOR, | |
650 | .name = "vhost-vsock", | |
651 | .fops = &vhost_vsock_fops, | |
652 | }; | |
653 | ||
654 | static struct virtio_transport vhost_transport = { | |
655 | .transport = { | |
656 | .get_local_cid = vhost_transport_get_local_cid, | |
657 | ||
658 | .init = virtio_transport_do_socket_init, | |
659 | .destruct = virtio_transport_destruct, | |
660 | .release = virtio_transport_release, | |
661 | .connect = virtio_transport_connect, | |
662 | .shutdown = virtio_transport_shutdown, | |
663 | ||
664 | .dgram_enqueue = virtio_transport_dgram_enqueue, | |
665 | .dgram_dequeue = virtio_transport_dgram_dequeue, | |
666 | .dgram_bind = virtio_transport_dgram_bind, | |
667 | .dgram_allow = virtio_transport_dgram_allow, | |
668 | ||
669 | .stream_enqueue = virtio_transport_stream_enqueue, | |
670 | .stream_dequeue = virtio_transport_stream_dequeue, | |
671 | .stream_has_data = virtio_transport_stream_has_data, | |
672 | .stream_has_space = virtio_transport_stream_has_space, | |
673 | .stream_rcvhiwat = virtio_transport_stream_rcvhiwat, | |
674 | .stream_is_active = virtio_transport_stream_is_active, | |
675 | .stream_allow = virtio_transport_stream_allow, | |
676 | ||
677 | .notify_poll_in = virtio_transport_notify_poll_in, | |
678 | .notify_poll_out = virtio_transport_notify_poll_out, | |
679 | .notify_recv_init = virtio_transport_notify_recv_init, | |
680 | .notify_recv_pre_block = virtio_transport_notify_recv_pre_block, | |
681 | .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue, | |
682 | .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue, | |
683 | .notify_send_init = virtio_transport_notify_send_init, | |
684 | .notify_send_pre_block = virtio_transport_notify_send_pre_block, | |
685 | .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue, | |
686 | .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue, | |
687 | ||
688 | .set_buffer_size = virtio_transport_set_buffer_size, | |
689 | .set_min_buffer_size = virtio_transport_set_min_buffer_size, | |
690 | .set_max_buffer_size = virtio_transport_set_max_buffer_size, | |
691 | .get_buffer_size = virtio_transport_get_buffer_size, | |
692 | .get_min_buffer_size = virtio_transport_get_min_buffer_size, | |
693 | .get_max_buffer_size = virtio_transport_get_max_buffer_size, | |
694 | }, | |
695 | ||
696 | .send_pkt = vhost_transport_send_pkt, | |
697 | }; | |
698 | ||
699 | static int __init vhost_vsock_init(void) | |
700 | { | |
701 | int ret; | |
702 | ||
703 | ret = vsock_core_init(&vhost_transport.transport); | |
704 | if (ret < 0) | |
705 | return ret; | |
706 | return misc_register(&vhost_vsock_misc); | |
707 | }; | |
708 | ||
709 | static void __exit vhost_vsock_exit(void) | |
710 | { | |
711 | misc_deregister(&vhost_vsock_misc); | |
712 | vsock_core_exit(); | |
713 | }; | |
714 | ||
715 | module_init(vhost_vsock_init); | |
716 | module_exit(vhost_vsock_exit); | |
717 | MODULE_LICENSE("GPL v2"); | |
718 | MODULE_AUTHOR("Asias He"); | |
719 | MODULE_DESCRIPTION("vhost transport for vsock "); |