1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Virtio vhost-user driver
4 *
5 * Copyright(c) 2019 Intel Corporation
6 *
7 * This driver allows virtio devices to be used over a vhost-user socket.
8 *
9 * Guest devices can be instantiated by kernel module or command line
10 * parameters. One device will be created for each parameter. Syntax:
11 *
12 * virtio_uml.device=<socket>:<virtio_id>[:<platform_id>]
13 * where:
14 * <socket> := vhost-user socket path to connect
15 * <virtio_id> := virtio device id (as in virtio_ids.h)
16 * <platform_id> := (optional) platform device id
17 *
18 * example:
19 * virtio_uml.device=/var/uml.socket:1
20 *
21 * Based on Virtio MMIO driver by Pawel Moll, copyright 2011-2014, ARM Ltd.
22 */
23 #include <linux/module.h>
24 #include <linux/of.h>
25 #include <linux/platform_device.h>
26 #include <linux/slab.h>
27 #include <linux/virtio.h>
28 #include <linux/virtio_config.h>
29 #include <linux/virtio_ring.h>
30 #include <linux/time-internal.h>
31 #include <linux/virtio-uml.h>
32 #include <shared/as-layout.h>
33 #include <irq_kern.h>
34 #include <init.h>
35 #include <os.h>
36 #include "vhost_user.h"
37
38 #define MAX_SUPPORTED_QUEUE_SIZE 256
39
40 #define to_virtio_uml_device(_vdev) \
41 container_of(_vdev, struct virtio_uml_device, vdev)
42
43 struct virtio_uml_platform_data {
44 u32 virtio_device_id;
45 const char *socket_path;
46 struct work_struct conn_broken_wk;
47 struct platform_device *pdev;
48 };
49
50 struct virtio_uml_device {
51 struct virtio_device vdev;
52 struct platform_device *pdev;
53 struct virtio_uml_platform_data *pdata;
54
55 spinlock_t sock_lock;
56 int sock, req_fd, irq;
57 u64 features;
58 u64 protocol_features;
59 u8 status;
60 u8 registered:1;
61 u8 suspended:1;
62 u8 no_vq_suspend:1;
63
64 u8 config_changed_irq:1;
65 uint64_t vq_irq_vq_map;
66 int recv_rc;
67 };
68
69 struct virtio_uml_vq_info {
70 int kick_fd, call_fd;
71 char name[32];
72 bool suspended;
73 };
74
75 extern unsigned long long physmem_size, highmem;
76
77 #define vu_err(vu_dev, ...) dev_err(&(vu_dev)->pdev->dev, ##__VA_ARGS__)
78
79 /* Vhost-user protocol */
80
81 static int full_sendmsg_fds(int fd, const void *buf, unsigned int len,
82 const int *fds, unsigned int fds_num)
83 {
84 int rc;
85
86 do {
87 rc = os_sendmsg_fds(fd, buf, len, fds, fds_num);
88 if (rc > 0) {
89 buf += rc;
90 len -= rc;
91 fds = NULL;
92 fds_num = 0;
93 }
94 } while (len && (rc >= 0 || rc == -EINTR));
95
96 if (rc < 0)
97 return rc;
98 return 0;
99 }
100
101 static int full_read(int fd, void *buf, int len, bool abortable)
102 {
103 int rc;
104
105 if (!len)
106 return 0;
107
108 do {
109 rc = os_read_file(fd, buf, len);
110 if (rc > 0) {
111 buf += rc;
112 len -= rc;
113 }
114 } while (len && (rc > 0 || rc == -EINTR || (!abortable && rc == -EAGAIN)));
115
116 if (rc < 0)
117 return rc;
118 if (rc == 0)
119 return -ECONNRESET;
120 return 0;
121 }
122
123 static int vhost_user_recv_header(int fd, struct vhost_user_msg *msg)
124 {
125 return full_read(fd, msg, sizeof(msg->header), true);
126 }
127
128 static int vhost_user_recv(struct virtio_uml_device *vu_dev,
129 int fd, struct vhost_user_msg *msg,
130 size_t max_payload_size, bool wait)
131 {
132 size_t size;
133 int rc;
134
135 /*
136 * In virtio time-travel mode, we're handling all the vhost-user
137 * FDs by polling them whenever appropriate. However, we may get
138 * into a situation where we're sending out an interrupt message
139 * to a device (e.g. a net device) and need to handle a simulation
140 * time message while doing so, e.g. one that tells us to update
141 * our idea of how long we can run without scheduling.
142 *
143 * Thus, we need to not just read() from the given fd, but need
144 * to also handle messages for the simulation time - this function
145 * does that for us while waiting for the given fd to be readable.
146 */
147 if (wait)
148 time_travel_wait_readable(fd);
149
150 rc = vhost_user_recv_header(fd, msg);
151
152 if (rc)
153 return rc;
154 size = msg->header.size;
155 if (size > max_payload_size)
156 return -EPROTO;
157 return full_read(fd, &msg->payload, size, false);
158 }
159
160 static void vhost_user_check_reset(struct virtio_uml_device *vu_dev,
161 int rc)
162 {
163 struct virtio_uml_platform_data *pdata = vu_dev->pdata;
164
165 if (rc != -ECONNRESET)
166 return;
167
168 if (!vu_dev->registered)
169 return;
170
171 vu_dev->registered = 0;
172
173 schedule_work(&pdata->conn_broken_wk);
174 }
175
176 static int vhost_user_recv_resp(struct virtio_uml_device *vu_dev,
177 struct vhost_user_msg *msg,
178 size_t max_payload_size)
179 {
180 int rc = vhost_user_recv(vu_dev, vu_dev->sock, msg,
181 max_payload_size, true);
182
183 if (rc) {
184 vhost_user_check_reset(vu_dev, rc);
185 return rc;
186 }
187
188 if (msg->header.flags != (VHOST_USER_FLAG_REPLY | VHOST_USER_VERSION))
189 return -EPROTO;
190
191 return 0;
192 }
193
194 static int vhost_user_recv_u64(struct virtio_uml_device *vu_dev,
195 u64 *value)
196 {
197 struct vhost_user_msg msg;
198 int rc = vhost_user_recv_resp(vu_dev, &msg,
199 sizeof(msg.payload.integer));
200
201 if (rc)
202 return rc;
203 if (msg.header.size != sizeof(msg.payload.integer))
204 return -EPROTO;
205 *value = msg.payload.integer;
206 return 0;
207 }
208
209 static int vhost_user_recv_req(struct virtio_uml_device *vu_dev,
210 struct vhost_user_msg *msg,
211 size_t max_payload_size)
212 {
213 int rc = vhost_user_recv(vu_dev, vu_dev->req_fd, msg,
214 max_payload_size, false);
215
216 if (rc)
217 return rc;
218
219 if ((msg->header.flags & ~VHOST_USER_FLAG_NEED_REPLY) !=
220 VHOST_USER_VERSION)
221 return -EPROTO;
222
223 return 0;
224 }
225
226 static int vhost_user_send(struct virtio_uml_device *vu_dev,
227 bool need_response, struct vhost_user_msg *msg,
228 int *fds, size_t num_fds)
229 {
230 size_t size = sizeof(msg->header) + msg->header.size;
231 unsigned long flags;
232 bool request_ack;
233 int rc;
234
235 msg->header.flags |= VHOST_USER_VERSION;
236
237 /*
238 * The need_response flag indicates that we already need a response,
239 * e.g. to read the features. In these cases, don't request an ACK as
240 * it is meaningless. Also request an ACK only if supported.
241 */
242 request_ack = !need_response;
243 if (!(vu_dev->protocol_features &
244 BIT_ULL(VHOST_USER_PROTOCOL_F_REPLY_ACK)))
245 request_ack = false;
246
247 if (request_ack)
248 msg->header.flags |= VHOST_USER_FLAG_NEED_REPLY;
249
250 spin_lock_irqsave(&vu_dev->sock_lock, flags);
251 rc = full_sendmsg_fds(vu_dev->sock, msg, size, fds, num_fds);
252 if (rc < 0)
253 goto out;
254
255 if (request_ack) {
256 uint64_t status;
257
258 rc = vhost_user_recv_u64(vu_dev, &status);
259 if (rc)
260 goto out;
261
262 if (status) {
263 vu_err(vu_dev, "slave reports error: %llu\n", status);
264 rc = -EIO;
265 goto out;
266 }
267 }
268
269 out:
270 spin_unlock_irqrestore(&vu_dev->sock_lock, flags);
271 return rc;
272 }
273
274 static int vhost_user_send_no_payload(struct virtio_uml_device *vu_dev,
275 bool need_response, u32 request)
276 {
277 struct vhost_user_msg msg = {
278 .header.request = request,
279 };
280
281 return vhost_user_send(vu_dev, need_response, &msg, NULL, 0);
282 }
283
284 static int vhost_user_send_no_payload_fd(struct virtio_uml_device *vu_dev,
285 u32 request, int fd)
286 {
287 struct vhost_user_msg msg = {
288 .header.request = request,
289 };
290
291 return vhost_user_send(vu_dev, false, &msg, &fd, 1);
292 }
293
294 static int vhost_user_send_u64(struct virtio_uml_device *vu_dev,
295 u32 request, u64 value)
296 {
297 struct vhost_user_msg msg = {
298 .header.request = request,
299 .header.size = sizeof(msg.payload.integer),
300 .payload.integer = value,
301 };
302
303 return vhost_user_send(vu_dev, false, &msg, NULL, 0);
304 }
305
306 static int vhost_user_set_owner(struct virtio_uml_device *vu_dev)
307 {
308 return vhost_user_send_no_payload(vu_dev, false, VHOST_USER_SET_OWNER);
309 }
310
311 static int vhost_user_get_features(struct virtio_uml_device *vu_dev,
312 u64 *features)
313 {
314 int rc = vhost_user_send_no_payload(vu_dev, true,
315 VHOST_USER_GET_FEATURES);
316
317 if (rc)
318 return rc;
319 return vhost_user_recv_u64(vu_dev, features);
320 }
321
322 static int vhost_user_set_features(struct virtio_uml_device *vu_dev,
323 u64 features)
324 {
325 return vhost_user_send_u64(vu_dev, VHOST_USER_SET_FEATURES, features);
326 }
327
328 static int vhost_user_get_protocol_features(struct virtio_uml_device *vu_dev,
329 u64 *protocol_features)
330 {
331 int rc = vhost_user_send_no_payload(vu_dev, true,
332 VHOST_USER_GET_PROTOCOL_FEATURES);
333
334 if (rc)
335 return rc;
336 return vhost_user_recv_u64(vu_dev, protocol_features);
337 }
338
339 static int vhost_user_set_protocol_features(struct virtio_uml_device *vu_dev,
340 u64 protocol_features)
341 {
342 return vhost_user_send_u64(vu_dev, VHOST_USER_SET_PROTOCOL_FEATURES,
343 protocol_features);
344 }
345
346 static void vhost_user_reply(struct virtio_uml_device *vu_dev,
347 struct vhost_user_msg *msg, int response)
348 {
349 struct vhost_user_msg reply = {
350 .payload.integer = response,
351 };
352 size_t size = sizeof(reply.header) + sizeof(reply.payload.integer);
353 int rc;
354
355 reply.header = msg->header;
356 reply.header.flags &= ~VHOST_USER_FLAG_NEED_REPLY;
357 reply.header.flags |= VHOST_USER_FLAG_REPLY;
358 reply.header.size = sizeof(reply.payload.integer);
359
360 rc = full_sendmsg_fds(vu_dev->req_fd, &reply, size, NULL, 0);
361
362 if (rc)
363 vu_err(vu_dev,
364 "sending reply to slave request failed: %d (size %zu)\n",
365 rc, size);
366 }
367
368 static irqreturn_t vu_req_read_message(struct virtio_uml_device *vu_dev,
369 struct time_travel_event *ev)
370 {
371 struct virtqueue *vq;
372 int response = 1;
373 struct {
374 struct vhost_user_msg msg;
375 u8 extra_payload[512];
376 } msg;
377 int rc;
378 irqreturn_t irq_rc = IRQ_NONE;
379
380 while (1) {
381 rc = vhost_user_recv_req(vu_dev, &msg.msg,
382 sizeof(msg.msg.payload) +
383 sizeof(msg.extra_payload));
384 if (rc)
385 break;
386
387 switch (msg.msg.header.request) {
388 case VHOST_USER_SLAVE_CONFIG_CHANGE_MSG:
389 vu_dev->config_changed_irq = true;
390 response = 0;
391 break;
392 case VHOST_USER_SLAVE_VRING_CALL:
393 virtio_device_for_each_vq((&vu_dev->vdev), vq) {
394 if (vq->index == msg.msg.payload.vring_state.index) {
395 response = 0;
396 vu_dev->vq_irq_vq_map |= BIT_ULL(vq->index);
397 break;
398 }
399 }
400 break;
401 case VHOST_USER_SLAVE_IOTLB_MSG:
402 /* not supported - VIRTIO_F_ACCESS_PLATFORM */
403 case VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG:
404 /* not supported - VHOST_USER_PROTOCOL_F_HOST_NOTIFIER */
405 default:
406 vu_err(vu_dev, "unexpected slave request %d\n",
407 msg.msg.header.request);
408 }
409
410 if (ev && !vu_dev->suspended)
411 time_travel_add_irq_event(ev);
412
413 if (msg.msg.header.flags & VHOST_USER_FLAG_NEED_REPLY)
414 vhost_user_reply(vu_dev, &msg.msg, response);
415 irq_rc = IRQ_HANDLED;
416 }
417 /* mask EAGAIN as we try non-blocking read until socket is empty */
418 vu_dev->recv_rc = (rc == -EAGAIN) ? 0 : rc;
419 return irq_rc;
420 }
421
422 static irqreturn_t vu_req_interrupt(int irq, void *data)
423 {
424 struct virtio_uml_device *vu_dev = data;
425 irqreturn_t ret = IRQ_HANDLED;
426
427 if (!um_irq_timetravel_handler_used())
428 ret = vu_req_read_message(vu_dev, NULL);
429
430 if (vu_dev->recv_rc) {
431 vhost_user_check_reset(vu_dev, vu_dev->recv_rc);
432 } else if (vu_dev->vq_irq_vq_map) {
433 struct virtqueue *vq;
434
435 virtio_device_for_each_vq((&vu_dev->vdev), vq) {
436 if (vu_dev->vq_irq_vq_map & BIT_ULL(vq->index))
437 vring_interrupt(0 /* ignored */, vq);
438 }
439 vu_dev->vq_irq_vq_map = 0;
440 } else if (vu_dev->config_changed_irq) {
441 virtio_config_changed(&vu_dev->vdev);
442 vu_dev->config_changed_irq = false;
443 }
444
445 return ret;
446 }
447
448 static void vu_req_interrupt_comm_handler(int irq, int fd, void *data,
449 struct time_travel_event *ev)
450 {
451 vu_req_read_message(data, ev);
452 }
453
454 static int vhost_user_init_slave_req(struct virtio_uml_device *vu_dev)
455 {
456 int rc, req_fds[2];
457
458 /* Use a pipe for slave req fd, SIGIO is not supported for eventfd */
459 rc = os_pipe(req_fds, true, true);
460 if (rc < 0)
461 return rc;
462 vu_dev->req_fd = req_fds[0];
463
464 rc = um_request_irq_tt(UM_IRQ_ALLOC, vu_dev->req_fd, IRQ_READ,
465 vu_req_interrupt, IRQF_SHARED,
466 vu_dev->pdev->name, vu_dev,
467 vu_req_interrupt_comm_handler);
468 if (rc < 0)
469 goto err_close;
470
471 vu_dev->irq = rc;
472
473 rc = vhost_user_send_no_payload_fd(vu_dev, VHOST_USER_SET_SLAVE_REQ_FD,
474 req_fds[1]);
475 if (rc)
476 goto err_free_irq;
477
478 goto out;
479
480 err_free_irq:
481 um_free_irq(vu_dev->irq, vu_dev);
482 err_close:
483 os_close_file(req_fds[0]);
484 out:
485 /* Close unused write end of request fds */
486 os_close_file(req_fds[1]);
487 return rc;
488 }
489
490 static int vhost_user_init(struct virtio_uml_device *vu_dev)
491 {
492 int rc = vhost_user_set_owner(vu_dev);
493
494 if (rc)
495 return rc;
496 rc = vhost_user_get_features(vu_dev, &vu_dev->features);
497 if (rc)
498 return rc;
499
500 if (vu_dev->features & BIT_ULL(VHOST_USER_F_PROTOCOL_FEATURES)) {
501 rc = vhost_user_get_protocol_features(vu_dev,
502 &vu_dev->protocol_features);
503 if (rc)
504 return rc;
505 vu_dev->protocol_features &= VHOST_USER_SUPPORTED_PROTOCOL_F;
506 rc = vhost_user_set_protocol_features(vu_dev,
507 vu_dev->protocol_features);
508 if (rc)
509 return rc;
510 }
511
512 if (vu_dev->protocol_features &
513 BIT_ULL(VHOST_USER_PROTOCOL_F_SLAVE_REQ)) {
514 rc = vhost_user_init_slave_req(vu_dev);
515 if (rc)
516 return rc;
517 }
518
519 return 0;
520 }
521
522 static void vhost_user_get_config(struct virtio_uml_device *vu_dev,
523 u32 offset, void *buf, u32 len)
524 {
525 u32 cfg_size = offset + len;
526 struct vhost_user_msg *msg;
527 size_t payload_size = sizeof(msg->payload.config) + cfg_size;
528 size_t msg_size = sizeof(msg->header) + payload_size;
529 int rc;
530
531 if (!(vu_dev->protocol_features &
532 BIT_ULL(VHOST_USER_PROTOCOL_F_CONFIG)))
533 return;
534
535 msg = kzalloc(msg_size, GFP_KERNEL);
536 if (!msg)
537 return;
538 msg->header.request = VHOST_USER_GET_CONFIG;
539 msg->header.size = payload_size;
540 msg->payload.config.offset = 0;
541 msg->payload.config.size = cfg_size;
542
543 rc = vhost_user_send(vu_dev, true, msg, NULL, 0);
544 if (rc) {
545 vu_err(vu_dev, "sending VHOST_USER_GET_CONFIG failed: %d\n",
546 rc);
547 goto free;
548 }
549
550 rc = vhost_user_recv_resp(vu_dev, msg, msg_size);
551 if (rc) {
552 vu_err(vu_dev,
553 "receiving VHOST_USER_GET_CONFIG response failed: %d\n",
554 rc);
555 goto free;
556 }
557
558 if (msg->header.size != payload_size ||
559 msg->payload.config.size != cfg_size) {
560 rc = -EPROTO;
561 vu_err(vu_dev,
562 "Invalid VHOST_USER_GET_CONFIG sizes (payload %d expected %zu, config %u expected %u)\n",
563 msg->header.size, payload_size,
564 msg->payload.config.size, cfg_size);
565 goto free;
566 }
567 memcpy(buf, msg->payload.config.payload + offset, len);
568
569 free:
570 kfree(msg);
571 }
572
573 static void vhost_user_set_config(struct virtio_uml_device *vu_dev,
574 u32 offset, const void *buf, u32 len)
575 {
576 struct vhost_user_msg *msg;
577 size_t payload_size = sizeof(msg->payload.config) + len;
578 size_t msg_size = sizeof(msg->header) + payload_size;
579 int rc;
580
581 if (!(vu_dev->protocol_features &
582 BIT_ULL(VHOST_USER_PROTOCOL_F_CONFIG)))
583 return;
584
585 msg = kzalloc(msg_size, GFP_KERNEL);
586 if (!msg)
587 return;
588 msg->header.request = VHOST_USER_SET_CONFIG;
589 msg->header.size = payload_size;
590 msg->payload.config.offset = offset;
591 msg->payload.config.size = len;
592 memcpy(msg->payload.config.payload, buf, len);
593
594 rc = vhost_user_send(vu_dev, false, msg, NULL, 0);
595 if (rc)
596 vu_err(vu_dev, "sending VHOST_USER_SET_CONFIG failed: %d\n",
597 rc);
598
599 kfree(msg);
600 }
601
602 static int vhost_user_init_mem_region(u64 addr, u64 size, int *fd_out,
603 struct vhost_user_mem_region *region_out)
604 {
605 unsigned long long mem_offset;
606 int rc = phys_mapping(addr, &mem_offset);
607
608 if (WARN(rc < 0, "phys_mapping of 0x%llx returned %d\n", addr, rc))
609 return -EFAULT;
610 *fd_out = rc;
611 region_out->guest_addr = addr;
612 region_out->user_addr = addr;
613 region_out->size = size;
614 region_out->mmap_offset = mem_offset;
615
616 /* Ensure mapping is valid for the entire region */
617 rc = phys_mapping(addr + size - 1, &mem_offset);
618 if (WARN(rc != *fd_out, "phys_mapping of 0x%llx failed: %d != %d\n",
619 addr + size - 1, rc, *fd_out))
620 return -EFAULT;
621 return 0;
622 }
623
624 static int vhost_user_set_mem_table(struct virtio_uml_device *vu_dev)
625 {
626 struct vhost_user_msg msg = {
627 .header.request = VHOST_USER_SET_MEM_TABLE,
628 .header.size = sizeof(msg.payload.mem_regions),
629 .payload.mem_regions.num = 1,
630 };
631 unsigned long reserved = uml_reserved - uml_physmem;
632 int fds[2];
633 int rc;
634
635 /*
636 * This is a bit tricky, see also the comment with setup_physmem().
637 *
638 * Essentially, setup_physmem() uses a file to mmap() our physmem,
639 * but the code and data we *already* have is omitted. To us, this
640 * is no difference, since they both become part of our address
641 * space and memory consumption. To somebody looking in from the
642 * outside, however, it is different because the part of our memory
643 * consumption that's already part of the binary (code/data) is not
644 * mapped from the file, so it's not visible to another mmap from
645 * the file descriptor.
646 *
647 * Thus, don't advertise this space to the vhost-user slave. This
648 * means that the slave will likely abort or similar when we give
649 * it an address from the hidden range, since it's not marked as
650 * a valid address, but at least that way we detect the issue and
651 * don't just have the slave read an all-zeroes buffer from the
652 * shared memory file, or write something there that we can never
653 * see (depending on the direction of the virtqueue traffic.)
654 *
655 * Since we usually don't want to use .text for virtio buffers,
656 * this effectively means that you cannot use
657 * 1) global variables, which are in the .bss and not in the shm
658 * file-backed memory
659 * 2) the stack in some processes, depending on where they have
660 * their stack (or maybe only no interrupt stack?)
661 *
662 * The stack is already not typically valid for DMA, so this isn't
663 * much of a restriction, but global variables might be encountered.
664 *
665 * It might be possible to fix it by copying around the data that's
666 * between bss_start and where we map the file now, but it's not
667 * something that you typically encounter with virtio drivers, so
668 * it didn't seem worthwhile.
669 */
670 rc = vhost_user_init_mem_region(reserved, physmem_size - reserved,
671 &fds[0],
672 &msg.payload.mem_regions.regions[0]);
673
674 if (rc < 0)
675 return rc;
676 if (highmem) {
677 msg.payload.mem_regions.num++;
678 rc = vhost_user_init_mem_region(__pa(end_iomem), highmem,
679 &fds[1], &msg.payload.mem_regions.regions[1]);
680 if (rc < 0)
681 return rc;
682 }
683
684 return vhost_user_send(vu_dev, false, &msg, fds,
685 msg.payload.mem_regions.num);
686 }
687
688 static int vhost_user_set_vring_state(struct virtio_uml_device *vu_dev,
689 u32 request, u32 index, u32 num)
690 {
691 struct vhost_user_msg msg = {
692 .header.request = request,
693 .header.size = sizeof(msg.payload.vring_state),
694 .payload.vring_state.index = index,
695 .payload.vring_state.num = num,
696 };
697
698 return vhost_user_send(vu_dev, false, &msg, NULL, 0);
699 }
700
701 static int vhost_user_set_vring_num(struct virtio_uml_device *vu_dev,
702 u32 index, u32 num)
703 {
704 return vhost_user_set_vring_state(vu_dev, VHOST_USER_SET_VRING_NUM,
705 index, num);
706 }
707
708 static int vhost_user_set_vring_base(struct virtio_uml_device *vu_dev,
709 u32 index, u32 offset)
710 {
711 return vhost_user_set_vring_state(vu_dev, VHOST_USER_SET_VRING_BASE,
712 index, offset);
713 }
714
715 static int vhost_user_set_vring_addr(struct virtio_uml_device *vu_dev,
716 u32 index, u64 desc, u64 used, u64 avail,
717 u64 log)
718 {
719 struct vhost_user_msg msg = {
720 .header.request = VHOST_USER_SET_VRING_ADDR,
721 .header.size = sizeof(msg.payload.vring_addr),
722 .payload.vring_addr.index = index,
723 .payload.vring_addr.desc = desc,
724 .payload.vring_addr.used = used,
725 .payload.vring_addr.avail = avail,
726 .payload.vring_addr.log = log,
727 };
728
729 return vhost_user_send(vu_dev, false, &msg, NULL, 0);
730 }
731
732 static int vhost_user_set_vring_fd(struct virtio_uml_device *vu_dev,
733 u32 request, int index, int fd)
734 {
735 struct vhost_user_msg msg = {
736 .header.request = request,
737 .header.size = sizeof(msg.payload.integer),
738 .payload.integer = index,
739 };
740
741 if (index & ~VHOST_USER_VRING_INDEX_MASK)
742 return -EINVAL;
743 if (fd < 0) {
744 msg.payload.integer |= VHOST_USER_VRING_POLL_MASK;
745 return vhost_user_send(vu_dev, false, &msg, NULL, 0);
746 }
747 return vhost_user_send(vu_dev, false, &msg, &fd, 1);
748 }
749
750 static int vhost_user_set_vring_call(struct virtio_uml_device *vu_dev,
751 int index, int fd)
752 {
753 return vhost_user_set_vring_fd(vu_dev, VHOST_USER_SET_VRING_CALL,
754 index, fd);
755 }
756
757 static int vhost_user_set_vring_kick(struct virtio_uml_device *vu_dev,
758 int index, int fd)
759 {
760 return vhost_user_set_vring_fd(vu_dev, VHOST_USER_SET_VRING_KICK,
761 index, fd);
762 }
763
764 static int vhost_user_set_vring_enable(struct virtio_uml_device *vu_dev,
765 u32 index, bool enable)
766 {
767 if (!(vu_dev->features & BIT_ULL(VHOST_USER_F_PROTOCOL_FEATURES)))
768 return 0;
769
770 return vhost_user_set_vring_state(vu_dev, VHOST_USER_SET_VRING_ENABLE,
771 index, enable);
772 }
773
774
775 /* Virtio interface */
776
777 static bool vu_notify(struct virtqueue *vq)
778 {
779 struct virtio_uml_vq_info *info = vq->priv;
780 const uint64_t n = 1;
781 int rc;
782
783 if (info->suspended)
784 return true;
785
786 time_travel_propagate_time();
787
788 if (info->kick_fd < 0) {
789 struct virtio_uml_device *vu_dev;
790
791 vu_dev = to_virtio_uml_device(vq->vdev);
792
793 return vhost_user_set_vring_state(vu_dev, VHOST_USER_VRING_KICK,
794 vq->index, 0) == 0;
795 }
796
797 do {
798 rc = os_write_file(info->kick_fd, &n, sizeof(n));
799 } while (rc == -EINTR);
800 return !WARN(rc != sizeof(n), "write returned %d\n", rc);
801 }
802
803 static irqreturn_t vu_interrupt(int irq, void *opaque)
804 {
805 struct virtqueue *vq = opaque;
806 struct virtio_uml_vq_info *info = vq->priv;
807 uint64_t n;
808 int rc;
809 irqreturn_t ret = IRQ_NONE;
810
811 do {
812 rc = os_read_file(info->call_fd, &n, sizeof(n));
813 if (rc == sizeof(n))
814 ret |= vring_interrupt(irq, vq);
815 } while (rc == sizeof(n) || rc == -EINTR);
816 WARN(rc != -EAGAIN, "read returned %d\n", rc);
817 return ret;
818 }
819
820
821 static void vu_get(struct virtio_device *vdev, unsigned offset,
822 void *buf, unsigned len)
823 {
824 struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
825
826 vhost_user_get_config(vu_dev, offset, buf, len);
827 }
828
829 static void vu_set(struct virtio_device *vdev, unsigned offset,
830 const void *buf, unsigned len)
831 {
832 struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
833
834 vhost_user_set_config(vu_dev, offset, buf, len);
835 }
836
837 static u8 vu_get_status(struct virtio_device *vdev)
838 {
839 struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
840
841 return vu_dev->status;
842 }
843
844 static void vu_set_status(struct virtio_device *vdev, u8 status)
845 {
846 struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
847
848 vu_dev->status = status;
849 }
850
851 static void vu_reset(struct virtio_device *vdev)
852 {
853 struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
854
855 vu_dev->status = 0;
856 }
857
858 static void vu_del_vq(struct virtqueue *vq)
859 {
860 struct virtio_uml_vq_info *info = vq->priv;
861
862 if (info->call_fd >= 0) {
863 struct virtio_uml_device *vu_dev;
864
865 vu_dev = to_virtio_uml_device(vq->vdev);
866
867 um_free_irq(vu_dev->irq, vq);
868 os_close_file(info->call_fd);
869 }
870
871 if (info->kick_fd >= 0)
872 os_close_file(info->kick_fd);
873
874 vring_del_virtqueue(vq);
875 kfree(info);
876 }
877
878 static void vu_del_vqs(struct virtio_device *vdev)
879 {
880 struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
881 struct virtqueue *vq, *n;
882 u64 features;
883
884 /* Note: reverse order as a workaround to a decoding bug in snabb */
885 list_for_each_entry_reverse(vq, &vdev->vqs, list)
886 WARN_ON(vhost_user_set_vring_enable(vu_dev, vq->index, false));
887
888 /* Ensure previous messages have been processed */
889 WARN_ON(vhost_user_get_features(vu_dev, &features));
890
891 list_for_each_entry_safe(vq, n, &vdev->vqs, list)
892 vu_del_vq(vq);
893 }
894
895 static int vu_setup_vq_call_fd(struct virtio_uml_device *vu_dev,
896 struct virtqueue *vq)
897 {
898 struct virtio_uml_vq_info *info = vq->priv;
899 int call_fds[2];
900 int rc;
901
902 /* no call FD needed/desired in this case */
903 if (vu_dev->protocol_features &
904 BIT_ULL(VHOST_USER_PROTOCOL_F_INBAND_NOTIFICATIONS) &&
905 vu_dev->protocol_features &
906 BIT_ULL(VHOST_USER_PROTOCOL_F_SLAVE_REQ)) {
907 info->call_fd = -1;
908 return 0;
909 }
910
911 /* Use a pipe for call fd, since SIGIO is not supported for eventfd */
912 rc = os_pipe(call_fds, true, true);
913 if (rc < 0)
914 return rc;
915
916 info->call_fd = call_fds[0];
917 rc = um_request_irq(vu_dev->irq, info->call_fd, IRQ_READ,
918 vu_interrupt, IRQF_SHARED, info->name, vq);
919 if (rc < 0)
920 goto close_both;
921
922 rc = vhost_user_set_vring_call(vu_dev, vq->index, call_fds[1]);
923 if (rc)
924 goto release_irq;
925
926 goto out;
927
928 release_irq:
929 um_free_irq(vu_dev->irq, vq);
930 close_both:
931 os_close_file(call_fds[0]);
932 out:
933 /* Close (unused) write end of call fds */
934 os_close_file(call_fds[1]);
935
936 return rc;
937 }
938
939 static struct virtqueue *vu_setup_vq(struct virtio_device *vdev,
940 unsigned index, vq_callback_t *callback,
941 const char *name, bool ctx)
942 {
943 struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
944 struct platform_device *pdev = vu_dev->pdev;
945 struct virtio_uml_vq_info *info;
946 struct virtqueue *vq;
947 int num = MAX_SUPPORTED_QUEUE_SIZE;
948 int rc;
949
950 info = kzalloc(sizeof(*info), GFP_KERNEL);
951 if (!info) {
952 rc = -ENOMEM;
953 goto error_kzalloc;
954 }
955 snprintf(info->name, sizeof(info->name), "%s.%d-%s", pdev->name,
956 pdev->id, name);
957
958 vq = vring_create_virtqueue(index, num, PAGE_SIZE, vdev, true, true,
959 ctx, vu_notify, callback, info->name);
960 if (!vq) {
961 rc = -ENOMEM;
962 goto error_create;
963 }
964 vq->priv = info;
965 vq->num_max = num;
966 num = virtqueue_get_vring_size(vq);
967
968 if (vu_dev->protocol_features &
969 BIT_ULL(VHOST_USER_PROTOCOL_F_INBAND_NOTIFICATIONS)) {
970 info->kick_fd = -1;
971 } else {
972 rc = os_eventfd(0, 0);
973 if (rc < 0)
974 goto error_kick;
975 info->kick_fd = rc;
976 }
977
978 rc = vu_setup_vq_call_fd(vu_dev, vq);
979 if (rc)
980 goto error_call;
981
982 rc = vhost_user_set_vring_num(vu_dev, index, num);
983 if (rc)
984 goto error_setup;
985
986 rc = vhost_user_set_vring_base(vu_dev, index, 0);
987 if (rc)
988 goto error_setup;
989
990 rc = vhost_user_set_vring_addr(vu_dev, index,
991 virtqueue_get_desc_addr(vq),
992 virtqueue_get_used_addr(vq),
993 virtqueue_get_avail_addr(vq),
994 (u64) -1);
995 if (rc)
996 goto error_setup;
997
998 return vq;
999
1000 error_setup:
1001 if (info->call_fd >= 0) {
1002 um_free_irq(vu_dev->irq, vq);
1003 os_close_file(info->call_fd);
1004 }
1005 error_call:
1006 if (info->kick_fd >= 0)
1007 os_close_file(info->kick_fd);
1008 error_kick:
1009 vring_del_virtqueue(vq);
1010 error_create:
1011 kfree(info);
1012 error_kzalloc:
1013 return ERR_PTR(rc);
1014 }
1015
1016 static int vu_find_vqs(struct virtio_device *vdev, unsigned nvqs,
1017 struct virtqueue *vqs[],
1018 struct virtqueue_info vqs_info[],
1019 struct irq_affinity *desc)
1020 {
1021 struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
1022 int i, queue_idx = 0, rc;
1023 struct virtqueue *vq;
1024
1025 /* not supported for now */
1026 if (WARN_ON(nvqs > 64))
1027 return -EINVAL;
1028
1029 rc = vhost_user_set_mem_table(vu_dev);
1030 if (rc)
1031 return rc;
1032
1033 for (i = 0; i < nvqs; ++i) {
1034 struct virtqueue_info *vqi = &vqs_info[i];
1035
1036 if (!vqi->name) {
1037 vqs[i] = NULL;
1038 continue;
1039 }
1040
1041 vqs[i] = vu_setup_vq(vdev, queue_idx++, vqi->callback,
1042 vqi->name, vqi->ctx);
1043 if (IS_ERR(vqs[i])) {
1044 rc = PTR_ERR(vqs[i]);
1045 goto error_setup;
1046 }
1047 }
1048
1049 list_for_each_entry(vq, &vdev->vqs, list) {
1050 struct virtio_uml_vq_info *info = vq->priv;
1051
1052 if (info->kick_fd >= 0) {
1053 rc = vhost_user_set_vring_kick(vu_dev, vq->index,
1054 info->kick_fd);
1055 if (rc)
1056 goto error_setup;
1057 }
1058
1059 rc = vhost_user_set_vring_enable(vu_dev, vq->index, true);
1060 if (rc)
1061 goto error_setup;
1062 }
1063
1064 return 0;
1065
1066 error_setup:
1067 vu_del_vqs(vdev);
1068 return rc;
1069 }
1070
1071 static u64 vu_get_features(struct virtio_device *vdev)
1072 {
1073 struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
1074
1075 return vu_dev->features;
1076 }
1077
1078 static int vu_finalize_features(struct virtio_device *vdev)
1079 {
1080 struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
1081 u64 supported = vdev->features & VHOST_USER_SUPPORTED_F;
1082
1083 vring_transport_features(vdev);
1084 vu_dev->features = vdev->features | supported;
1085
1086 return vhost_user_set_features(vu_dev, vu_dev->features);
1087 }
1088
1089 static const char *vu_bus_name(struct virtio_device *vdev)
1090 {
1091 struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
1092
1093 return vu_dev->pdev->name;
1094 }
1095
1096 static const struct virtio_config_ops virtio_uml_config_ops = {
1097 .get = vu_get,
1098 .set = vu_set,
1099 .get_status = vu_get_status,
1100 .set_status = vu_set_status,
1101 .reset = vu_reset,
1102 .find_vqs = vu_find_vqs,
1103 .del_vqs = vu_del_vqs,
1104 .get_features = vu_get_features,
1105 .finalize_features = vu_finalize_features,
1106 .bus_name = vu_bus_name,
1107 };
1108
1109 static void virtio_uml_release_dev(struct device *d)
1110 {
1111 struct virtio_device *vdev =
1112 container_of(d, struct virtio_device, dev);
1113 struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
1114
1115 time_travel_propagate_time();
1116
1117 /* might not have been opened due to not negotiating the feature */
1118 if (vu_dev->req_fd >= 0) {
1119 um_free_irq(vu_dev->irq, vu_dev);
1120 os_close_file(vu_dev->req_fd);
1121 }
1122
1123 os_close_file(vu_dev->sock);
1124 kfree(vu_dev);
1125 }
1126
1127 void virtio_uml_set_no_vq_suspend(struct virtio_device *vdev,
1128 bool no_vq_suspend)
1129 {
1130 struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
1131
1132 if (WARN_ON(vdev->config != &virtio_uml_config_ops))
1133 return;
1134
1135 vu_dev->no_vq_suspend = no_vq_suspend;
1136 dev_info(&vdev->dev, "%sabled VQ suspend\n",
1137 no_vq_suspend ? "dis" : "en");
1138 }
1139
1140 static void vu_of_conn_broken(struct work_struct *wk)
1141 {
1142 struct virtio_uml_platform_data *pdata;
1143 struct virtio_uml_device *vu_dev;
1144
1145 pdata = container_of(wk, struct virtio_uml_platform_data, conn_broken_wk);
1146
1147 vu_dev = platform_get_drvdata(pdata->pdev);
1148
1149 virtio_break_device(&vu_dev->vdev);
1150
1151 /*
1152 * We can't remove the device from the devicetree so the only thing we
1153 * can do is warn.
1154 */
1155 WARN_ON(1);
1156 }
1157
1158 /* Platform device */
1159
1160 static struct virtio_uml_platform_data *
1161 virtio_uml_create_pdata(struct platform_device *pdev)
1162 {
1163 struct device_node *np = pdev->dev.of_node;
1164 struct virtio_uml_platform_data *pdata;
1165 int ret;
1166
1167 if (!np)
1168 return ERR_PTR(-EINVAL);
1169
1170 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
1171 if (!pdata)
1172 return ERR_PTR(-ENOMEM);
1173
1174 INIT_WORK(&pdata->conn_broken_wk, vu_of_conn_broken);
1175 pdata->pdev = pdev;
1176
1177 ret = of_property_read_string(np, "socket-path", &pdata->socket_path);
1178 if (ret)
1179 return ERR_PTR(ret);
1180
1181 ret = of_property_read_u32(np, "virtio-device-id",
1182 &pdata->virtio_device_id);
1183 if (ret)
1184 return ERR_PTR(ret);
1185
1186 return pdata;
1187 }
1188
1189 static int virtio_uml_probe(struct platform_device *pdev)
1190 {
1191 struct virtio_uml_platform_data *pdata = pdev->dev.platform_data;
1192 struct virtio_uml_device *vu_dev;
1193 int rc;
1194
1195 if (!pdata) {
1196 pdata = virtio_uml_create_pdata(pdev);
1197 if (IS_ERR(pdata))
1198 return PTR_ERR(pdata);
1199 }
1200
1201 vu_dev = kzalloc(sizeof(*vu_dev), GFP_KERNEL);
1202 if (!vu_dev)
1203 return -ENOMEM;
1204
1205 vu_dev->pdata = pdata;
1206 vu_dev->vdev.dev.parent = &pdev->dev;
1207 vu_dev->vdev.dev.release = virtio_uml_release_dev;
1208 vu_dev->vdev.config = &virtio_uml_config_ops;
1209 vu_dev->vdev.id.device = pdata->virtio_device_id;
1210 vu_dev->vdev.id.vendor = VIRTIO_DEV_ANY_ID;
1211 vu_dev->pdev = pdev;
1212 vu_dev->req_fd = -1;
1213
1214 time_travel_propagate_time();
1215
1216 do {
1217 rc = os_connect_socket(pdata->socket_path);
1218 } while (rc == -EINTR);
1219 if (rc < 0)
1220 goto error_free;
1221 vu_dev->sock = rc;
1222
1223 spin_lock_init(&vu_dev->sock_lock);
1224
1225 rc = vhost_user_init(vu_dev);
1226 if (rc)
1227 goto error_init;
1228
1229 platform_set_drvdata(pdev, vu_dev);
1230
1231 device_set_wakeup_capable(&vu_dev->vdev.dev, true);
1232
1233 rc = register_virtio_device(&vu_dev->vdev);
1234 if (rc)
1235 put_device(&vu_dev->vdev.dev);
1236 vu_dev->registered = 1;
1237 return rc;
1238
1239 error_init:
1240 os_close_file(vu_dev->sock);
1241 error_free:
1242 kfree(vu_dev);
1243 return rc;
1244 }
1245
1246 static void virtio_uml_remove(struct platform_device *pdev)
1247 {
1248 struct virtio_uml_device *vu_dev = platform_get_drvdata(pdev);
1249
1250 unregister_virtio_device(&vu_dev->vdev);
1251 }
1252
1253 /* Command line device list */
1254
1255 static void vu_cmdline_release_dev(struct device *d)
1256 {
1257 }
1258
1259 static struct device vu_cmdline_parent = {
1260 .init_name = "virtio-uml-cmdline",
1261 .release = vu_cmdline_release_dev,
1262 };
1263
1264 static bool vu_cmdline_parent_registered;
1265 static int vu_cmdline_id;
1266
1267 static int vu_unregister_cmdline_device(struct device *dev, void *data)
1268 {
1269 struct platform_device *pdev = to_platform_device(dev);
1270 struct virtio_uml_platform_data *pdata = pdev->dev.platform_data;
1271
1272 kfree(pdata->socket_path);
1273 platform_device_unregister(pdev);
1274 return 0;
1275 }
1276
1277 static void vu_conn_broken(struct work_struct *wk)
1278 {
1279 struct virtio_uml_platform_data *pdata;
1280 struct virtio_uml_device *vu_dev;
1281
1282 pdata = container_of(wk, struct virtio_uml_platform_data, conn_broken_wk);
1283
1284 vu_dev = platform_get_drvdata(pdata->pdev);
1285
1286 virtio_break_device(&vu_dev->vdev);
1287
1288 vu_unregister_cmdline_device(&pdata->pdev->dev, NULL);
1289 }
1290
1291 static int vu_cmdline_set(const char *device, const struct kernel_param *kp)
1292 {
1293 const char *ids = strchr(device, ':');
1294 unsigned int virtio_device_id;
1295 int processed, consumed, err;
1296 char *socket_path;
1297 struct virtio_uml_platform_data pdata, *ppdata;
1298 struct platform_device *pdev;
1299
1300 if (!ids || ids == device)
1301 return -EINVAL;
1302
1303 processed = sscanf(ids, ":%u%n:%d%n",
1304 &virtio_device_id, &consumed,
1305 &vu_cmdline_id, &consumed);
1306
1307 if (processed < 1 || ids[consumed])
1308 return -EINVAL;
1309
1310 if (!vu_cmdline_parent_registered) {
1311 err = device_register(&vu_cmdline_parent);
1312 if (err) {
1313 pr_err("Failed to register parent device!\n");
1314 put_device(&vu_cmdline_parent);
1315 return err;
1316 }
1317 vu_cmdline_parent_registered = true;
1318 }
1319
1320 socket_path = kmemdup_nul(device, ids - device, GFP_KERNEL);
1321 if (!socket_path)
1322 return -ENOMEM;
1323
1324 pdata.virtio_device_id = (u32) virtio_device_id;
1325 pdata.socket_path = socket_path;
1326
1327 pr_info("Registering device virtio-uml.%d id=%d at %s\n",
1328 vu_cmdline_id, virtio_device_id, socket_path);
1329
1330 pdev = platform_device_register_data(&vu_cmdline_parent, "virtio-uml",
1331 vu_cmdline_id++, &pdata,
1332 sizeof(pdata));
1333 err = PTR_ERR_OR_ZERO(pdev);
1334 if (err)
1335 goto free;
1336
1337 ppdata = pdev->dev.platform_data;
1338 ppdata->pdev = pdev;
1339 INIT_WORK(&ppdata->conn_broken_wk, vu_conn_broken);
1340
1341 return 0;
1342
1343 free:
1344 kfree(socket_path);
1345 return err;
1346 }
1347
1348 static int vu_cmdline_get_device(struct device *dev, void *data)
1349 {
1350 struct platform_device *pdev = to_platform_device(dev);
1351 struct virtio_uml_platform_data *pdata = pdev->dev.platform_data;
1352 char *buffer = data;
1353 unsigned int len = strlen(buffer);
1354
1355 snprintf(buffer + len, PAGE_SIZE - len, "%s:%d:%d\n",
1356 pdata->socket_path, pdata->virtio_device_id, pdev->id);
1357 return 0;
1358 }
1359
1360 static int vu_cmdline_get(char *buffer, const struct kernel_param *kp)
1361 {
1362 buffer[0] = '\0';
1363 if (vu_cmdline_parent_registered)
1364 device_for_each_child(&vu_cmdline_parent, buffer,
1365 vu_cmdline_get_device);
1366 return strlen(buffer) + 1;
1367 }
1368
1369 static const struct kernel_param_ops vu_cmdline_param_ops = {
1370 .set = vu_cmdline_set,
1371 .get = vu_cmdline_get,
1372 };
1373
1374 device_param_cb(device, &vu_cmdline_param_ops, NULL, S_IRUSR);
1375 __uml_help(vu_cmdline_param_ops,
1376 "virtio_uml.device=<socket>:<virtio_id>[:<platform_id>]\n"
1377 " Configure a virtio device over a vhost-user socket.\n"
1378 " See virtio_ids.h for a list of possible virtio device id values.\n"
1379 " Optionally use a specific platform_device id.\n\n"
1380 );
1381
1382
1383 static void vu_unregister_cmdline_devices(void)
1384 {
1385 if (vu_cmdline_parent_registered) {
1386 device_for_each_child(&vu_cmdline_parent, NULL,
1387 vu_unregister_cmdline_device);
1388 device_unregister(&vu_cmdline_parent);
1389 vu_cmdline_parent_registered = false;
1390 }
1391 }
1392
1393 /* Platform driver */
1394
1395 static const struct of_device_id virtio_uml_match[] = {
1396 { .compatible = "virtio,uml", },
1397 { }
1398 };
1399 MODULE_DEVICE_TABLE(of, virtio_uml_match);
1400
1401 static int virtio_uml_suspend(struct platform_device *pdev, pm_message_t state)
1402 {
1403 struct virtio_uml_device *vu_dev = platform_get_drvdata(pdev);
1404
1405 if (!vu_dev->no_vq_suspend) {
1406 struct virtqueue *vq;
1407
1408 virtio_device_for_each_vq((&vu_dev->vdev), vq) {
1409 struct virtio_uml_vq_info *info = vq->priv;
1410
1411 info->suspended = true;
1412 vhost_user_set_vring_enable(vu_dev, vq->index, false);
1413 }
1414 }
1415
1416 if (!device_may_wakeup(&vu_dev->vdev.dev)) {
1417 vu_dev->suspended = true;
1418 return 0;
1419 }
1420
1421 return irq_set_irq_wake(vu_dev->irq, 1);
1422 }
1423
1424 static int virtio_uml_resume(struct platform_device *pdev)
1425 {
1426 struct virtio_uml_device *vu_dev = platform_get_drvdata(pdev);
1427
1428 if (!vu_dev->no_vq_suspend) {
1429 struct virtqueue *vq;
1430
1431 virtio_device_for_each_vq((&vu_dev->vdev), vq) {
1432 struct virtio_uml_vq_info *info = vq->priv;
1433
1434 info->suspended = false;
1435 vhost_user_set_vring_enable(vu_dev, vq->index, true);
1436 }
1437 }
1438
1439 vu_dev->suspended = false;
1440
1441 if (!device_may_wakeup(&vu_dev->vdev.dev))
1442 return 0;
1443
1444 return irq_set_irq_wake(vu_dev->irq, 0);
1445 }
1446
1447 static struct platform_driver virtio_uml_driver = {
1448 .probe = virtio_uml_probe,
1449 .remove_new = virtio_uml_remove,
1450 .driver = {
1451 .name = "virtio-uml",
1452 .of_match_table = virtio_uml_match,
1453 },
1454 .suspend = virtio_uml_suspend,
1455 .resume = virtio_uml_resume,
1456 };
1457
1458 static int __init virtio_uml_init(void)
1459 {
1460 return platform_driver_register(&virtio_uml_driver);
1461 }
1462
1463 static void __exit virtio_uml_exit(void)
1464 {
1465 platform_driver_unregister(&virtio_uml_driver);
1466 vu_unregister_cmdline_devices();
1467 }
1468
1469 module_init(virtio_uml_init);
1470 module_exit(virtio_uml_exit);
1471 __uml_exitcall(virtio_uml_exit);
1472
1473 MODULE_DESCRIPTION("UML driver for vhost-user virtio devices");
1474 MODULE_LICENSE("GPL");
1475
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