Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2018-2020 Intel Corporation.
4 * Copyright (C) 2020 Red Hat, Inc.
5 *
6 * Author: Tiwei Bie <tiwei.bie@intel.com>
7 * Jason Wang <jasowang@redhat.com>
8 *
9 * Thanks Michael S. Tsirkin for the valuable comments and
10 * suggestions. And thanks to Cunming Liang and Zhihong Wang for all
11 * their supports.
12 */
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/cdev.h>
17#include <linux/device.h>
18#include <linux/mm.h>
19#include <linux/slab.h>
20#include <linux/iommu.h>
21#include <linux/uuid.h>
22#include <linux/vdpa.h>
23#include <linux/nospec.h>
24#include <linux/vhost.h>
25
26#include "vhost.h"
27
28enum {
29 VHOST_VDPA_BACKEND_FEATURES =
30 (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2) |
31 (1ULL << VHOST_BACKEND_F_IOTLB_BATCH) |
32 (1ULL << VHOST_BACKEND_F_IOTLB_ASID),
33};
34
35#define VHOST_VDPA_DEV_MAX (1U << MINORBITS)
36
37#define VHOST_VDPA_IOTLB_BUCKETS 16
38
39struct vhost_vdpa_as {
40 struct hlist_node hash_link;
41 struct vhost_iotlb iotlb;
42 u32 id;
43};
44
45struct vhost_vdpa {
46 struct vhost_dev vdev;
47 struct iommu_domain *domain;
48 struct vhost_virtqueue *vqs;
49 struct completion completion;
50 struct vdpa_device *vdpa;
51 struct hlist_head as[VHOST_VDPA_IOTLB_BUCKETS];
52 struct device dev;
53 struct cdev cdev;
54 atomic_t opened;
55 u32 nvqs;
56 int virtio_id;
57 int minor;
58 struct eventfd_ctx *config_ctx;
59 int in_batch;
60 struct vdpa_iova_range range;
61 u32 batch_asid;
62 bool suspended;
63};
64
65static DEFINE_IDA(vhost_vdpa_ida);
66
67static dev_t vhost_vdpa_major;
68
69static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v,
70 struct vhost_iotlb *iotlb, u64 start,
71 u64 last, u32 asid);
72
73static inline u32 iotlb_to_asid(struct vhost_iotlb *iotlb)
74{
75 struct vhost_vdpa_as *as = container_of(iotlb, struct
76 vhost_vdpa_as, iotlb);
77 return as->id;
78}
79
80static struct vhost_vdpa_as *asid_to_as(struct vhost_vdpa *v, u32 asid)
81{
82 struct hlist_head *head = &v->as[asid % VHOST_VDPA_IOTLB_BUCKETS];
83 struct vhost_vdpa_as *as;
84
85 hlist_for_each_entry(as, head, hash_link)
86 if (as->id == asid)
87 return as;
88
89 return NULL;
90}
91
92static struct vhost_iotlb *asid_to_iotlb(struct vhost_vdpa *v, u32 asid)
93{
94 struct vhost_vdpa_as *as = asid_to_as(v, asid);
95
96 if (!as)
97 return NULL;
98
99 return &as->iotlb;
100}
101
102static struct vhost_vdpa_as *vhost_vdpa_alloc_as(struct vhost_vdpa *v, u32 asid)
103{
104 struct hlist_head *head = &v->as[asid % VHOST_VDPA_IOTLB_BUCKETS];
105 struct vhost_vdpa_as *as;
106
107 if (asid_to_as(v, asid))
108 return NULL;
109
110 if (asid >= v->vdpa->nas)
111 return NULL;
112
113 as = kmalloc(sizeof(*as), GFP_KERNEL);
114 if (!as)
115 return NULL;
116
117 vhost_iotlb_init(&as->iotlb, 0, 0);
118 as->id = asid;
119 hlist_add_head(&as->hash_link, head);
120
121 return as;
122}
123
124static struct vhost_vdpa_as *vhost_vdpa_find_alloc_as(struct vhost_vdpa *v,
125 u32 asid)
126{
127 struct vhost_vdpa_as *as = asid_to_as(v, asid);
128
129 if (as)
130 return as;
131
132 return vhost_vdpa_alloc_as(v, asid);
133}
134
135static void vhost_vdpa_reset_map(struct vhost_vdpa *v, u32 asid)
136{
137 struct vdpa_device *vdpa = v->vdpa;
138 const struct vdpa_config_ops *ops = vdpa->config;
139
140 if (ops->reset_map)
141 ops->reset_map(vdpa, asid);
142}
143
144static int vhost_vdpa_remove_as(struct vhost_vdpa *v, u32 asid)
145{
146 struct vhost_vdpa_as *as = asid_to_as(v, asid);
147
148 if (!as)
149 return -EINVAL;
150
151 hlist_del(&as->hash_link);
152 vhost_vdpa_iotlb_unmap(v, &as->iotlb, 0ULL, 0ULL - 1, asid);
153 /*
154 * Devices with vendor specific IOMMU may need to restore
155 * iotlb to the initial or default state, which cannot be
156 * cleaned up in the all range unmap call above. Give them
157 * a chance to clean up or reset the map to the desired
158 * state.
159 */
160 vhost_vdpa_reset_map(v, asid);
161 kfree(as);
162
163 return 0;
164}
165
166static void handle_vq_kick(struct vhost_work *work)
167{
168 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
169 poll.work);
170 struct vhost_vdpa *v = container_of(vq->dev, struct vhost_vdpa, vdev);
171 const struct vdpa_config_ops *ops = v->vdpa->config;
172
173 ops->kick_vq(v->vdpa, vq - v->vqs);
174}
175
176static irqreturn_t vhost_vdpa_virtqueue_cb(void *private)
177{
178 struct vhost_virtqueue *vq = private;
179 struct eventfd_ctx *call_ctx = vq->call_ctx.ctx;
180
181 if (call_ctx)
182 eventfd_signal(call_ctx);
183
184 return IRQ_HANDLED;
185}
186
187static irqreturn_t vhost_vdpa_config_cb(void *private)
188{
189 struct vhost_vdpa *v = private;
190 struct eventfd_ctx *config_ctx = v->config_ctx;
191
192 if (config_ctx)
193 eventfd_signal(config_ctx);
194
195 return IRQ_HANDLED;
196}
197
198static void vhost_vdpa_setup_vq_irq(struct vhost_vdpa *v, u16 qid)
199{
200 struct vhost_virtqueue *vq = &v->vqs[qid];
201 const struct vdpa_config_ops *ops = v->vdpa->config;
202 struct vdpa_device *vdpa = v->vdpa;
203 int ret, irq;
204
205 if (!ops->get_vq_irq)
206 return;
207
208 irq = ops->get_vq_irq(vdpa, qid);
209 if (irq < 0)
210 return;
211
212 irq_bypass_unregister_producer(&vq->call_ctx.producer);
213 if (!vq->call_ctx.ctx)
214 return;
215
216 vq->call_ctx.producer.token = vq->call_ctx.ctx;
217 vq->call_ctx.producer.irq = irq;
218 ret = irq_bypass_register_producer(&vq->call_ctx.producer);
219 if (unlikely(ret))
220 dev_info(&v->dev, "vq %u, irq bypass producer (token %p) registration fails, ret = %d\n",
221 qid, vq->call_ctx.producer.token, ret);
222}
223
224static void vhost_vdpa_unsetup_vq_irq(struct vhost_vdpa *v, u16 qid)
225{
226 struct vhost_virtqueue *vq = &v->vqs[qid];
227
228 irq_bypass_unregister_producer(&vq->call_ctx.producer);
229}
230
231static int _compat_vdpa_reset(struct vhost_vdpa *v)
232{
233 struct vdpa_device *vdpa = v->vdpa;
234 u32 flags = 0;
235
236 v->suspended = false;
237
238 if (v->vdev.vqs) {
239 flags |= !vhost_backend_has_feature(v->vdev.vqs[0],
240 VHOST_BACKEND_F_IOTLB_PERSIST) ?
241 VDPA_RESET_F_CLEAN_MAP : 0;
242 }
243
244 return vdpa_reset(vdpa, flags);
245}
246
247static int vhost_vdpa_reset(struct vhost_vdpa *v)
248{
249 v->in_batch = 0;
250 return _compat_vdpa_reset(v);
251}
252
253static long vhost_vdpa_bind_mm(struct vhost_vdpa *v)
254{
255 struct vdpa_device *vdpa = v->vdpa;
256 const struct vdpa_config_ops *ops = vdpa->config;
257
258 if (!vdpa->use_va || !ops->bind_mm)
259 return 0;
260
261 return ops->bind_mm(vdpa, v->vdev.mm);
262}
263
264static void vhost_vdpa_unbind_mm(struct vhost_vdpa *v)
265{
266 struct vdpa_device *vdpa = v->vdpa;
267 const struct vdpa_config_ops *ops = vdpa->config;
268
269 if (!vdpa->use_va || !ops->unbind_mm)
270 return;
271
272 ops->unbind_mm(vdpa);
273}
274
275static long vhost_vdpa_get_device_id(struct vhost_vdpa *v, u8 __user *argp)
276{
277 struct vdpa_device *vdpa = v->vdpa;
278 const struct vdpa_config_ops *ops = vdpa->config;
279 u32 device_id;
280
281 device_id = ops->get_device_id(vdpa);
282
283 if (copy_to_user(argp, &device_id, sizeof(device_id)))
284 return -EFAULT;
285
286 return 0;
287}
288
289static long vhost_vdpa_get_status(struct vhost_vdpa *v, u8 __user *statusp)
290{
291 struct vdpa_device *vdpa = v->vdpa;
292 const struct vdpa_config_ops *ops = vdpa->config;
293 u8 status;
294
295 status = ops->get_status(vdpa);
296
297 if (copy_to_user(statusp, &status, sizeof(status)))
298 return -EFAULT;
299
300 return 0;
301}
302
303static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp)
304{
305 struct vdpa_device *vdpa = v->vdpa;
306 const struct vdpa_config_ops *ops = vdpa->config;
307 u8 status, status_old;
308 u32 nvqs = v->nvqs;
309 int ret;
310 u16 i;
311
312 if (copy_from_user(&status, statusp, sizeof(status)))
313 return -EFAULT;
314
315 status_old = ops->get_status(vdpa);
316
317 /*
318 * Userspace shouldn't remove status bits unless reset the
319 * status to 0.
320 */
321 if (status != 0 && (status_old & ~status) != 0)
322 return -EINVAL;
323
324 if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) && !(status & VIRTIO_CONFIG_S_DRIVER_OK))
325 for (i = 0; i < nvqs; i++)
326 vhost_vdpa_unsetup_vq_irq(v, i);
327
328 if (status == 0) {
329 ret = _compat_vdpa_reset(v);
330 if (ret)
331 return ret;
332 } else
333 vdpa_set_status(vdpa, status);
334
335 if ((status & VIRTIO_CONFIG_S_DRIVER_OK) && !(status_old & VIRTIO_CONFIG_S_DRIVER_OK))
336 for (i = 0; i < nvqs; i++)
337 vhost_vdpa_setup_vq_irq(v, i);
338
339 return 0;
340}
341
342static int vhost_vdpa_config_validate(struct vhost_vdpa *v,
343 struct vhost_vdpa_config *c)
344{
345 struct vdpa_device *vdpa = v->vdpa;
346 size_t size = vdpa->config->get_config_size(vdpa);
347
348 if (c->len == 0 || c->off > size)
349 return -EINVAL;
350
351 if (c->len > size - c->off)
352 return -E2BIG;
353
354 return 0;
355}
356
357static long vhost_vdpa_get_config(struct vhost_vdpa *v,
358 struct vhost_vdpa_config __user *c)
359{
360 struct vdpa_device *vdpa = v->vdpa;
361 struct vhost_vdpa_config config;
362 unsigned long size = offsetof(struct vhost_vdpa_config, buf);
363 u8 *buf;
364
365 if (copy_from_user(&config, c, size))
366 return -EFAULT;
367 if (vhost_vdpa_config_validate(v, &config))
368 return -EINVAL;
369 buf = kvzalloc(config.len, GFP_KERNEL);
370 if (!buf)
371 return -ENOMEM;
372
373 vdpa_get_config(vdpa, config.off, buf, config.len);
374
375 if (copy_to_user(c->buf, buf, config.len)) {
376 kvfree(buf);
377 return -EFAULT;
378 }
379
380 kvfree(buf);
381 return 0;
382}
383
384static long vhost_vdpa_set_config(struct vhost_vdpa *v,
385 struct vhost_vdpa_config __user *c)
386{
387 struct vdpa_device *vdpa = v->vdpa;
388 struct vhost_vdpa_config config;
389 unsigned long size = offsetof(struct vhost_vdpa_config, buf);
390 u8 *buf;
391
392 if (copy_from_user(&config, c, size))
393 return -EFAULT;
394 if (vhost_vdpa_config_validate(v, &config))
395 return -EINVAL;
396
397 buf = vmemdup_user(c->buf, config.len);
398 if (IS_ERR(buf))
399 return PTR_ERR(buf);
400
401 vdpa_set_config(vdpa, config.off, buf, config.len);
402
403 kvfree(buf);
404 return 0;
405}
406
407static bool vhost_vdpa_can_suspend(const struct vhost_vdpa *v)
408{
409 struct vdpa_device *vdpa = v->vdpa;
410 const struct vdpa_config_ops *ops = vdpa->config;
411
412 return ops->suspend;
413}
414
415static bool vhost_vdpa_can_resume(const struct vhost_vdpa *v)
416{
417 struct vdpa_device *vdpa = v->vdpa;
418 const struct vdpa_config_ops *ops = vdpa->config;
419
420 return ops->resume;
421}
422
423static bool vhost_vdpa_has_desc_group(const struct vhost_vdpa *v)
424{
425 struct vdpa_device *vdpa = v->vdpa;
426 const struct vdpa_config_ops *ops = vdpa->config;
427
428 return ops->get_vq_desc_group;
429}
430
431static long vhost_vdpa_get_features(struct vhost_vdpa *v, u64 __user *featurep)
432{
433 struct vdpa_device *vdpa = v->vdpa;
434 const struct vdpa_config_ops *ops = vdpa->config;
435 u64 features;
436
437 features = ops->get_device_features(vdpa);
438
439 if (copy_to_user(featurep, &features, sizeof(features)))
440 return -EFAULT;
441
442 return 0;
443}
444
445static u64 vhost_vdpa_get_backend_features(const struct vhost_vdpa *v)
446{
447 struct vdpa_device *vdpa = v->vdpa;
448 const struct vdpa_config_ops *ops = vdpa->config;
449
450 if (!ops->get_backend_features)
451 return 0;
452 else
453 return ops->get_backend_features(vdpa);
454}
455
456static bool vhost_vdpa_has_persistent_map(const struct vhost_vdpa *v)
457{
458 struct vdpa_device *vdpa = v->vdpa;
459 const struct vdpa_config_ops *ops = vdpa->config;
460
461 return (!ops->set_map && !ops->dma_map) || ops->reset_map ||
462 vhost_vdpa_get_backend_features(v) & BIT_ULL(VHOST_BACKEND_F_IOTLB_PERSIST);
463}
464
465static long vhost_vdpa_set_features(struct vhost_vdpa *v, u64 __user *featurep)
466{
467 struct vdpa_device *vdpa = v->vdpa;
468 const struct vdpa_config_ops *ops = vdpa->config;
469 struct vhost_dev *d = &v->vdev;
470 u64 actual_features;
471 u64 features;
472 int i;
473
474 /*
475 * It's not allowed to change the features after they have
476 * been negotiated.
477 */
478 if (ops->get_status(vdpa) & VIRTIO_CONFIG_S_FEATURES_OK)
479 return -EBUSY;
480
481 if (copy_from_user(&features, featurep, sizeof(features)))
482 return -EFAULT;
483
484 if (vdpa_set_features(vdpa, features))
485 return -EINVAL;
486
487 /* let the vqs know what has been configured */
488 actual_features = ops->get_driver_features(vdpa);
489 for (i = 0; i < d->nvqs; ++i) {
490 struct vhost_virtqueue *vq = d->vqs[i];
491
492 mutex_lock(&vq->mutex);
493 vq->acked_features = actual_features;
494 mutex_unlock(&vq->mutex);
495 }
496
497 return 0;
498}
499
500static long vhost_vdpa_get_vring_num(struct vhost_vdpa *v, u16 __user *argp)
501{
502 struct vdpa_device *vdpa = v->vdpa;
503 const struct vdpa_config_ops *ops = vdpa->config;
504 u16 num;
505
506 num = ops->get_vq_num_max(vdpa);
507
508 if (copy_to_user(argp, &num, sizeof(num)))
509 return -EFAULT;
510
511 return 0;
512}
513
514static void vhost_vdpa_config_put(struct vhost_vdpa *v)
515{
516 if (v->config_ctx) {
517 eventfd_ctx_put(v->config_ctx);
518 v->config_ctx = NULL;
519 }
520}
521
522static long vhost_vdpa_set_config_call(struct vhost_vdpa *v, u32 __user *argp)
523{
524 struct vdpa_callback cb;
525 int fd;
526 struct eventfd_ctx *ctx;
527
528 cb.callback = vhost_vdpa_config_cb;
529 cb.private = v;
530 if (copy_from_user(&fd, argp, sizeof(fd)))
531 return -EFAULT;
532
533 ctx = fd == VHOST_FILE_UNBIND ? NULL : eventfd_ctx_fdget(fd);
534 swap(ctx, v->config_ctx);
535
536 if (!IS_ERR_OR_NULL(ctx))
537 eventfd_ctx_put(ctx);
538
539 if (IS_ERR(v->config_ctx)) {
540 long ret = PTR_ERR(v->config_ctx);
541
542 v->config_ctx = NULL;
543 return ret;
544 }
545
546 v->vdpa->config->set_config_cb(v->vdpa, &cb);
547
548 return 0;
549}
550
551static long vhost_vdpa_get_iova_range(struct vhost_vdpa *v, u32 __user *argp)
552{
553 struct vhost_vdpa_iova_range range = {
554 .first = v->range.first,
555 .last = v->range.last,
556 };
557
558 if (copy_to_user(argp, &range, sizeof(range)))
559 return -EFAULT;
560 return 0;
561}
562
563static long vhost_vdpa_get_config_size(struct vhost_vdpa *v, u32 __user *argp)
564{
565 struct vdpa_device *vdpa = v->vdpa;
566 const struct vdpa_config_ops *ops = vdpa->config;
567 u32 size;
568
569 size = ops->get_config_size(vdpa);
570
571 if (copy_to_user(argp, &size, sizeof(size)))
572 return -EFAULT;
573
574 return 0;
575}
576
577static long vhost_vdpa_get_vqs_count(struct vhost_vdpa *v, u32 __user *argp)
578{
579 struct vdpa_device *vdpa = v->vdpa;
580
581 if (copy_to_user(argp, &vdpa->nvqs, sizeof(vdpa->nvqs)))
582 return -EFAULT;
583
584 return 0;
585}
586
587/* After a successful return of ioctl the device must not process more
588 * virtqueue descriptors. The device can answer to read or writes of config
589 * fields as if it were not suspended. In particular, writing to "queue_enable"
590 * with a value of 1 will not make the device start processing buffers.
591 */
592static long vhost_vdpa_suspend(struct vhost_vdpa *v)
593{
594 struct vdpa_device *vdpa = v->vdpa;
595 const struct vdpa_config_ops *ops = vdpa->config;
596 int ret;
597
598 if (!ops->suspend)
599 return -EOPNOTSUPP;
600
601 ret = ops->suspend(vdpa);
602 if (!ret)
603 v->suspended = true;
604
605 return ret;
606}
607
608/* After a successful return of this ioctl the device resumes processing
609 * virtqueue descriptors. The device becomes fully operational the same way it
610 * was before it was suspended.
611 */
612static long vhost_vdpa_resume(struct vhost_vdpa *v)
613{
614 struct vdpa_device *vdpa = v->vdpa;
615 const struct vdpa_config_ops *ops = vdpa->config;
616 int ret;
617
618 if (!ops->resume)
619 return -EOPNOTSUPP;
620
621 ret = ops->resume(vdpa);
622 if (!ret)
623 v->suspended = false;
624
625 return ret;
626}
627
628static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
629 void __user *argp)
630{
631 struct vdpa_device *vdpa = v->vdpa;
632 const struct vdpa_config_ops *ops = vdpa->config;
633 struct vdpa_vq_state vq_state;
634 struct vdpa_callback cb;
635 struct vhost_virtqueue *vq;
636 struct vhost_vring_state s;
637 u32 idx;
638 long r;
639
640 r = get_user(idx, (u32 __user *)argp);
641 if (r < 0)
642 return r;
643
644 if (idx >= v->nvqs)
645 return -ENOBUFS;
646
647 idx = array_index_nospec(idx, v->nvqs);
648 vq = &v->vqs[idx];
649
650 switch (cmd) {
651 case VHOST_VDPA_SET_VRING_ENABLE:
652 if (copy_from_user(&s, argp, sizeof(s)))
653 return -EFAULT;
654 ops->set_vq_ready(vdpa, idx, s.num);
655 return 0;
656 case VHOST_VDPA_GET_VRING_GROUP:
657 if (!ops->get_vq_group)
658 return -EOPNOTSUPP;
659 s.index = idx;
660 s.num = ops->get_vq_group(vdpa, idx);
661 if (s.num >= vdpa->ngroups)
662 return -EIO;
663 else if (copy_to_user(argp, &s, sizeof(s)))
664 return -EFAULT;
665 return 0;
666 case VHOST_VDPA_GET_VRING_DESC_GROUP:
667 if (!vhost_vdpa_has_desc_group(v))
668 return -EOPNOTSUPP;
669 s.index = idx;
670 s.num = ops->get_vq_desc_group(vdpa, idx);
671 if (s.num >= vdpa->ngroups)
672 return -EIO;
673 else if (copy_to_user(argp, &s, sizeof(s)))
674 return -EFAULT;
675 return 0;
676 case VHOST_VDPA_SET_GROUP_ASID:
677 if (copy_from_user(&s, argp, sizeof(s)))
678 return -EFAULT;
679 if (s.num >= vdpa->nas)
680 return -EINVAL;
681 if (!ops->set_group_asid)
682 return -EOPNOTSUPP;
683 return ops->set_group_asid(vdpa, idx, s.num);
684 case VHOST_GET_VRING_BASE:
685 r = ops->get_vq_state(v->vdpa, idx, &vq_state);
686 if (r)
687 return r;
688
689 if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED)) {
690 vq->last_avail_idx = vq_state.packed.last_avail_idx |
691 (vq_state.packed.last_avail_counter << 15);
692 vq->last_used_idx = vq_state.packed.last_used_idx |
693 (vq_state.packed.last_used_counter << 15);
694 } else {
695 vq->last_avail_idx = vq_state.split.avail_index;
696 }
697 break;
698 }
699
700 r = vhost_vring_ioctl(&v->vdev, cmd, argp);
701 if (r)
702 return r;
703
704 switch (cmd) {
705 case VHOST_SET_VRING_ADDR:
706 if ((ops->get_status(vdpa) & VIRTIO_CONFIG_S_DRIVER_OK) && !v->suspended)
707 return -EINVAL;
708
709 if (ops->set_vq_address(vdpa, idx,
710 (u64)(uintptr_t)vq->desc,
711 (u64)(uintptr_t)vq->avail,
712 (u64)(uintptr_t)vq->used))
713 r = -EINVAL;
714 break;
715
716 case VHOST_SET_VRING_BASE:
717 if ((ops->get_status(vdpa) & VIRTIO_CONFIG_S_DRIVER_OK) && !v->suspended)
718 return -EINVAL;
719
720 if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED)) {
721 vq_state.packed.last_avail_idx = vq->last_avail_idx & 0x7fff;
722 vq_state.packed.last_avail_counter = !!(vq->last_avail_idx & 0x8000);
723 vq_state.packed.last_used_idx = vq->last_used_idx & 0x7fff;
724 vq_state.packed.last_used_counter = !!(vq->last_used_idx & 0x8000);
725 } else {
726 vq_state.split.avail_index = vq->last_avail_idx;
727 }
728 r = ops->set_vq_state(vdpa, idx, &vq_state);
729 break;
730
731 case VHOST_SET_VRING_CALL:
732 if (vq->call_ctx.ctx) {
733 cb.callback = vhost_vdpa_virtqueue_cb;
734 cb.private = vq;
735 cb.trigger = vq->call_ctx.ctx;
736 } else {
737 cb.callback = NULL;
738 cb.private = NULL;
739 cb.trigger = NULL;
740 }
741 ops->set_vq_cb(vdpa, idx, &cb);
742 vhost_vdpa_setup_vq_irq(v, idx);
743 break;
744
745 case VHOST_SET_VRING_NUM:
746 ops->set_vq_num(vdpa, idx, vq->num);
747 break;
748 }
749
750 return r;
751}
752
753static long vhost_vdpa_unlocked_ioctl(struct file *filep,
754 unsigned int cmd, unsigned long arg)
755{
756 struct vhost_vdpa *v = filep->private_data;
757 struct vhost_dev *d = &v->vdev;
758 void __user *argp = (void __user *)arg;
759 u64 __user *featurep = argp;
760 u64 features;
761 long r = 0;
762
763 if (cmd == VHOST_SET_BACKEND_FEATURES) {
764 if (copy_from_user(&features, featurep, sizeof(features)))
765 return -EFAULT;
766 if (features & ~(VHOST_VDPA_BACKEND_FEATURES |
767 BIT_ULL(VHOST_BACKEND_F_DESC_ASID) |
768 BIT_ULL(VHOST_BACKEND_F_IOTLB_PERSIST) |
769 BIT_ULL(VHOST_BACKEND_F_SUSPEND) |
770 BIT_ULL(VHOST_BACKEND_F_RESUME) |
771 BIT_ULL(VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK)))
772 return -EOPNOTSUPP;
773 if ((features & BIT_ULL(VHOST_BACKEND_F_SUSPEND)) &&
774 !vhost_vdpa_can_suspend(v))
775 return -EOPNOTSUPP;
776 if ((features & BIT_ULL(VHOST_BACKEND_F_RESUME)) &&
777 !vhost_vdpa_can_resume(v))
778 return -EOPNOTSUPP;
779 if ((features & BIT_ULL(VHOST_BACKEND_F_DESC_ASID)) &&
780 !(features & BIT_ULL(VHOST_BACKEND_F_IOTLB_ASID)))
781 return -EINVAL;
782 if ((features & BIT_ULL(VHOST_BACKEND_F_DESC_ASID)) &&
783 !vhost_vdpa_has_desc_group(v))
784 return -EOPNOTSUPP;
785 if ((features & BIT_ULL(VHOST_BACKEND_F_IOTLB_PERSIST)) &&
786 !vhost_vdpa_has_persistent_map(v))
787 return -EOPNOTSUPP;
788 vhost_set_backend_features(&v->vdev, features);
789 return 0;
790 }
791
792 mutex_lock(&d->mutex);
793
794 switch (cmd) {
795 case VHOST_VDPA_GET_DEVICE_ID:
796 r = vhost_vdpa_get_device_id(v, argp);
797 break;
798 case VHOST_VDPA_GET_STATUS:
799 r = vhost_vdpa_get_status(v, argp);
800 break;
801 case VHOST_VDPA_SET_STATUS:
802 r = vhost_vdpa_set_status(v, argp);
803 break;
804 case VHOST_VDPA_GET_CONFIG:
805 r = vhost_vdpa_get_config(v, argp);
806 break;
807 case VHOST_VDPA_SET_CONFIG:
808 r = vhost_vdpa_set_config(v, argp);
809 break;
810 case VHOST_GET_FEATURES:
811 r = vhost_vdpa_get_features(v, argp);
812 break;
813 case VHOST_SET_FEATURES:
814 r = vhost_vdpa_set_features(v, argp);
815 break;
816 case VHOST_VDPA_GET_VRING_NUM:
817 r = vhost_vdpa_get_vring_num(v, argp);
818 break;
819 case VHOST_VDPA_GET_GROUP_NUM:
820 if (copy_to_user(argp, &v->vdpa->ngroups,
821 sizeof(v->vdpa->ngroups)))
822 r = -EFAULT;
823 break;
824 case VHOST_VDPA_GET_AS_NUM:
825 if (copy_to_user(argp, &v->vdpa->nas, sizeof(v->vdpa->nas)))
826 r = -EFAULT;
827 break;
828 case VHOST_SET_LOG_BASE:
829 case VHOST_SET_LOG_FD:
830 r = -ENOIOCTLCMD;
831 break;
832 case VHOST_VDPA_SET_CONFIG_CALL:
833 r = vhost_vdpa_set_config_call(v, argp);
834 break;
835 case VHOST_GET_BACKEND_FEATURES:
836 features = VHOST_VDPA_BACKEND_FEATURES;
837 if (vhost_vdpa_can_suspend(v))
838 features |= BIT_ULL(VHOST_BACKEND_F_SUSPEND);
839 if (vhost_vdpa_can_resume(v))
840 features |= BIT_ULL(VHOST_BACKEND_F_RESUME);
841 if (vhost_vdpa_has_desc_group(v))
842 features |= BIT_ULL(VHOST_BACKEND_F_DESC_ASID);
843 if (vhost_vdpa_has_persistent_map(v))
844 features |= BIT_ULL(VHOST_BACKEND_F_IOTLB_PERSIST);
845 features |= vhost_vdpa_get_backend_features(v);
846 if (copy_to_user(featurep, &features, sizeof(features)))
847 r = -EFAULT;
848 break;
849 case VHOST_VDPA_GET_IOVA_RANGE:
850 r = vhost_vdpa_get_iova_range(v, argp);
851 break;
852 case VHOST_VDPA_GET_CONFIG_SIZE:
853 r = vhost_vdpa_get_config_size(v, argp);
854 break;
855 case VHOST_VDPA_GET_VQS_COUNT:
856 r = vhost_vdpa_get_vqs_count(v, argp);
857 break;
858 case VHOST_VDPA_SUSPEND:
859 r = vhost_vdpa_suspend(v);
860 break;
861 case VHOST_VDPA_RESUME:
862 r = vhost_vdpa_resume(v);
863 break;
864 default:
865 r = vhost_dev_ioctl(&v->vdev, cmd, argp);
866 if (r == -ENOIOCTLCMD)
867 r = vhost_vdpa_vring_ioctl(v, cmd, argp);
868 break;
869 }
870
871 if (r)
872 goto out;
873
874 switch (cmd) {
875 case VHOST_SET_OWNER:
876 r = vhost_vdpa_bind_mm(v);
877 if (r)
878 vhost_dev_reset_owner(d, NULL);
879 break;
880 }
881out:
882 mutex_unlock(&d->mutex);
883 return r;
884}
885static void vhost_vdpa_general_unmap(struct vhost_vdpa *v,
886 struct vhost_iotlb_map *map, u32 asid)
887{
888 struct vdpa_device *vdpa = v->vdpa;
889 const struct vdpa_config_ops *ops = vdpa->config;
890 if (ops->dma_map) {
891 ops->dma_unmap(vdpa, asid, map->start, map->size);
892 } else if (ops->set_map == NULL) {
893 iommu_unmap(v->domain, map->start, map->size);
894 }
895}
896
897static void vhost_vdpa_pa_unmap(struct vhost_vdpa *v, struct vhost_iotlb *iotlb,
898 u64 start, u64 last, u32 asid)
899{
900 struct vhost_dev *dev = &v->vdev;
901 struct vhost_iotlb_map *map;
902 struct page *page;
903 unsigned long pfn, pinned;
904
905 while ((map = vhost_iotlb_itree_first(iotlb, start, last)) != NULL) {
906 pinned = PFN_DOWN(map->size);
907 for (pfn = PFN_DOWN(map->addr);
908 pinned > 0; pfn++, pinned--) {
909 page = pfn_to_page(pfn);
910 if (map->perm & VHOST_ACCESS_WO)
911 set_page_dirty_lock(page);
912 unpin_user_page(page);
913 }
914 atomic64_sub(PFN_DOWN(map->size), &dev->mm->pinned_vm);
915 vhost_vdpa_general_unmap(v, map, asid);
916 vhost_iotlb_map_free(iotlb, map);
917 }
918}
919
920static void vhost_vdpa_va_unmap(struct vhost_vdpa *v, struct vhost_iotlb *iotlb,
921 u64 start, u64 last, u32 asid)
922{
923 struct vhost_iotlb_map *map;
924 struct vdpa_map_file *map_file;
925
926 while ((map = vhost_iotlb_itree_first(iotlb, start, last)) != NULL) {
927 map_file = (struct vdpa_map_file *)map->opaque;
928 fput(map_file->file);
929 kfree(map_file);
930 vhost_vdpa_general_unmap(v, map, asid);
931 vhost_iotlb_map_free(iotlb, map);
932 }
933}
934
935static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v,
936 struct vhost_iotlb *iotlb, u64 start,
937 u64 last, u32 asid)
938{
939 struct vdpa_device *vdpa = v->vdpa;
940
941 if (vdpa->use_va)
942 return vhost_vdpa_va_unmap(v, iotlb, start, last, asid);
943
944 return vhost_vdpa_pa_unmap(v, iotlb, start, last, asid);
945}
946
947static int perm_to_iommu_flags(u32 perm)
948{
949 int flags = 0;
950
951 switch (perm) {
952 case VHOST_ACCESS_WO:
953 flags |= IOMMU_WRITE;
954 break;
955 case VHOST_ACCESS_RO:
956 flags |= IOMMU_READ;
957 break;
958 case VHOST_ACCESS_RW:
959 flags |= (IOMMU_WRITE | IOMMU_READ);
960 break;
961 default:
962 WARN(1, "invalidate vhost IOTLB permission\n");
963 break;
964 }
965
966 return flags | IOMMU_CACHE;
967}
968
969static int vhost_vdpa_map(struct vhost_vdpa *v, struct vhost_iotlb *iotlb,
970 u64 iova, u64 size, u64 pa, u32 perm, void *opaque)
971{
972 struct vhost_dev *dev = &v->vdev;
973 struct vdpa_device *vdpa = v->vdpa;
974 const struct vdpa_config_ops *ops = vdpa->config;
975 u32 asid = iotlb_to_asid(iotlb);
976 int r = 0;
977
978 r = vhost_iotlb_add_range_ctx(iotlb, iova, iova + size - 1,
979 pa, perm, opaque);
980 if (r)
981 return r;
982
983 if (ops->dma_map) {
984 r = ops->dma_map(vdpa, asid, iova, size, pa, perm, opaque);
985 } else if (ops->set_map) {
986 if (!v->in_batch)
987 r = ops->set_map(vdpa, asid, iotlb);
988 } else {
989 r = iommu_map(v->domain, iova, pa, size,
990 perm_to_iommu_flags(perm),
991 GFP_KERNEL_ACCOUNT);
992 }
993 if (r) {
994 vhost_iotlb_del_range(iotlb, iova, iova + size - 1);
995 return r;
996 }
997
998 if (!vdpa->use_va)
999 atomic64_add(PFN_DOWN(size), &dev->mm->pinned_vm);
1000
1001 return 0;
1002}
1003
1004static void vhost_vdpa_unmap(struct vhost_vdpa *v,
1005 struct vhost_iotlb *iotlb,
1006 u64 iova, u64 size)
1007{
1008 struct vdpa_device *vdpa = v->vdpa;
1009 const struct vdpa_config_ops *ops = vdpa->config;
1010 u32 asid = iotlb_to_asid(iotlb);
1011
1012 vhost_vdpa_iotlb_unmap(v, iotlb, iova, iova + size - 1, asid);
1013
1014 if (ops->set_map) {
1015 if (!v->in_batch)
1016 ops->set_map(vdpa, asid, iotlb);
1017 }
1018
1019}
1020
1021static int vhost_vdpa_va_map(struct vhost_vdpa *v,
1022 struct vhost_iotlb *iotlb,
1023 u64 iova, u64 size, u64 uaddr, u32 perm)
1024{
1025 struct vhost_dev *dev = &v->vdev;
1026 u64 offset, map_size, map_iova = iova;
1027 struct vdpa_map_file *map_file;
1028 struct vm_area_struct *vma;
1029 int ret = 0;
1030
1031 mmap_read_lock(dev->mm);
1032
1033 while (size) {
1034 vma = find_vma(dev->mm, uaddr);
1035 if (!vma) {
1036 ret = -EINVAL;
1037 break;
1038 }
1039 map_size = min(size, vma->vm_end - uaddr);
1040 if (!(vma->vm_file && (vma->vm_flags & VM_SHARED) &&
1041 !(vma->vm_flags & (VM_IO | VM_PFNMAP))))
1042 goto next;
1043
1044 map_file = kzalloc(sizeof(*map_file), GFP_KERNEL);
1045 if (!map_file) {
1046 ret = -ENOMEM;
1047 break;
1048 }
1049 offset = (vma->vm_pgoff << PAGE_SHIFT) + uaddr - vma->vm_start;
1050 map_file->offset = offset;
1051 map_file->file = get_file(vma->vm_file);
1052 ret = vhost_vdpa_map(v, iotlb, map_iova, map_size, uaddr,
1053 perm, map_file);
1054 if (ret) {
1055 fput(map_file->file);
1056 kfree(map_file);
1057 break;
1058 }
1059next:
1060 size -= map_size;
1061 uaddr += map_size;
1062 map_iova += map_size;
1063 }
1064 if (ret)
1065 vhost_vdpa_unmap(v, iotlb, iova, map_iova - iova);
1066
1067 mmap_read_unlock(dev->mm);
1068
1069 return ret;
1070}
1071
1072static int vhost_vdpa_pa_map(struct vhost_vdpa *v,
1073 struct vhost_iotlb *iotlb,
1074 u64 iova, u64 size, u64 uaddr, u32 perm)
1075{
1076 struct vhost_dev *dev = &v->vdev;
1077 struct page **page_list;
1078 unsigned long list_size = PAGE_SIZE / sizeof(struct page *);
1079 unsigned int gup_flags = FOLL_LONGTERM;
1080 unsigned long npages, cur_base, map_pfn, last_pfn = 0;
1081 unsigned long lock_limit, sz2pin, nchunks, i;
1082 u64 start = iova;
1083 long pinned;
1084 int ret = 0;
1085
1086 /* Limit the use of memory for bookkeeping */
1087 page_list = (struct page **) __get_free_page(GFP_KERNEL);
1088 if (!page_list)
1089 return -ENOMEM;
1090
1091 if (perm & VHOST_ACCESS_WO)
1092 gup_flags |= FOLL_WRITE;
1093
1094 npages = PFN_UP(size + (iova & ~PAGE_MASK));
1095 if (!npages) {
1096 ret = -EINVAL;
1097 goto free;
1098 }
1099
1100 mmap_read_lock(dev->mm);
1101
1102 lock_limit = PFN_DOWN(rlimit(RLIMIT_MEMLOCK));
1103 if (npages + atomic64_read(&dev->mm->pinned_vm) > lock_limit) {
1104 ret = -ENOMEM;
1105 goto unlock;
1106 }
1107
1108 cur_base = uaddr & PAGE_MASK;
1109 iova &= PAGE_MASK;
1110 nchunks = 0;
1111
1112 while (npages) {
1113 sz2pin = min_t(unsigned long, npages, list_size);
1114 pinned = pin_user_pages(cur_base, sz2pin,
1115 gup_flags, page_list);
1116 if (sz2pin != pinned) {
1117 if (pinned < 0) {
1118 ret = pinned;
1119 } else {
1120 unpin_user_pages(page_list, pinned);
1121 ret = -ENOMEM;
1122 }
1123 goto out;
1124 }
1125 nchunks++;
1126
1127 if (!last_pfn)
1128 map_pfn = page_to_pfn(page_list[0]);
1129
1130 for (i = 0; i < pinned; i++) {
1131 unsigned long this_pfn = page_to_pfn(page_list[i]);
1132 u64 csize;
1133
1134 if (last_pfn && (this_pfn != last_pfn + 1)) {
1135 /* Pin a contiguous chunk of memory */
1136 csize = PFN_PHYS(last_pfn - map_pfn + 1);
1137 ret = vhost_vdpa_map(v, iotlb, iova, csize,
1138 PFN_PHYS(map_pfn),
1139 perm, NULL);
1140 if (ret) {
1141 /*
1142 * Unpin the pages that are left unmapped
1143 * from this point on in the current
1144 * page_list. The remaining outstanding
1145 * ones which may stride across several
1146 * chunks will be covered in the common
1147 * error path subsequently.
1148 */
1149 unpin_user_pages(&page_list[i],
1150 pinned - i);
1151 goto out;
1152 }
1153
1154 map_pfn = this_pfn;
1155 iova += csize;
1156 nchunks = 0;
1157 }
1158
1159 last_pfn = this_pfn;
1160 }
1161
1162 cur_base += PFN_PHYS(pinned);
1163 npages -= pinned;
1164 }
1165
1166 /* Pin the rest chunk */
1167 ret = vhost_vdpa_map(v, iotlb, iova, PFN_PHYS(last_pfn - map_pfn + 1),
1168 PFN_PHYS(map_pfn), perm, NULL);
1169out:
1170 if (ret) {
1171 if (nchunks) {
1172 unsigned long pfn;
1173
1174 /*
1175 * Unpin the outstanding pages which are yet to be
1176 * mapped but haven't due to vdpa_map() or
1177 * pin_user_pages() failure.
1178 *
1179 * Mapped pages are accounted in vdpa_map(), hence
1180 * the corresponding unpinning will be handled by
1181 * vdpa_unmap().
1182 */
1183 WARN_ON(!last_pfn);
1184 for (pfn = map_pfn; pfn <= last_pfn; pfn++)
1185 unpin_user_page(pfn_to_page(pfn));
1186 }
1187 vhost_vdpa_unmap(v, iotlb, start, size);
1188 }
1189unlock:
1190 mmap_read_unlock(dev->mm);
1191free:
1192 free_page((unsigned long)page_list);
1193 return ret;
1194
1195}
1196
1197static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v,
1198 struct vhost_iotlb *iotlb,
1199 struct vhost_iotlb_msg *msg)
1200{
1201 struct vdpa_device *vdpa = v->vdpa;
1202
1203 if (msg->iova < v->range.first || !msg->size ||
1204 msg->iova > U64_MAX - msg->size + 1 ||
1205 msg->iova + msg->size - 1 > v->range.last)
1206 return -EINVAL;
1207
1208 if (vhost_iotlb_itree_first(iotlb, msg->iova,
1209 msg->iova + msg->size - 1))
1210 return -EEXIST;
1211
1212 if (vdpa->use_va)
1213 return vhost_vdpa_va_map(v, iotlb, msg->iova, msg->size,
1214 msg->uaddr, msg->perm);
1215
1216 return vhost_vdpa_pa_map(v, iotlb, msg->iova, msg->size, msg->uaddr,
1217 msg->perm);
1218}
1219
1220static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev, u32 asid,
1221 struct vhost_iotlb_msg *msg)
1222{
1223 struct vhost_vdpa *v = container_of(dev, struct vhost_vdpa, vdev);
1224 struct vdpa_device *vdpa = v->vdpa;
1225 const struct vdpa_config_ops *ops = vdpa->config;
1226 struct vhost_iotlb *iotlb = NULL;
1227 struct vhost_vdpa_as *as = NULL;
1228 int r = 0;
1229
1230 mutex_lock(&dev->mutex);
1231
1232 r = vhost_dev_check_owner(dev);
1233 if (r)
1234 goto unlock;
1235
1236 if (msg->type == VHOST_IOTLB_UPDATE ||
1237 msg->type == VHOST_IOTLB_BATCH_BEGIN) {
1238 as = vhost_vdpa_find_alloc_as(v, asid);
1239 if (!as) {
1240 dev_err(&v->dev, "can't find and alloc asid %d\n",
1241 asid);
1242 r = -EINVAL;
1243 goto unlock;
1244 }
1245 iotlb = &as->iotlb;
1246 } else
1247 iotlb = asid_to_iotlb(v, asid);
1248
1249 if ((v->in_batch && v->batch_asid != asid) || !iotlb) {
1250 if (v->in_batch && v->batch_asid != asid) {
1251 dev_info(&v->dev, "batch id %d asid %d\n",
1252 v->batch_asid, asid);
1253 }
1254 if (!iotlb)
1255 dev_err(&v->dev, "no iotlb for asid %d\n", asid);
1256 r = -EINVAL;
1257 goto unlock;
1258 }
1259
1260 switch (msg->type) {
1261 case VHOST_IOTLB_UPDATE:
1262 r = vhost_vdpa_process_iotlb_update(v, iotlb, msg);
1263 break;
1264 case VHOST_IOTLB_INVALIDATE:
1265 vhost_vdpa_unmap(v, iotlb, msg->iova, msg->size);
1266 break;
1267 case VHOST_IOTLB_BATCH_BEGIN:
1268 v->batch_asid = asid;
1269 v->in_batch = true;
1270 break;
1271 case VHOST_IOTLB_BATCH_END:
1272 if (v->in_batch && ops->set_map)
1273 ops->set_map(vdpa, asid, iotlb);
1274 v->in_batch = false;
1275 break;
1276 default:
1277 r = -EINVAL;
1278 break;
1279 }
1280unlock:
1281 mutex_unlock(&dev->mutex);
1282
1283 return r;
1284}
1285
1286static ssize_t vhost_vdpa_chr_write_iter(struct kiocb *iocb,
1287 struct iov_iter *from)
1288{
1289 struct file *file = iocb->ki_filp;
1290 struct vhost_vdpa *v = file->private_data;
1291 struct vhost_dev *dev = &v->vdev;
1292
1293 return vhost_chr_write_iter(dev, from);
1294}
1295
1296static int vhost_vdpa_alloc_domain(struct vhost_vdpa *v)
1297{
1298 struct vdpa_device *vdpa = v->vdpa;
1299 const struct vdpa_config_ops *ops = vdpa->config;
1300 struct device *dma_dev = vdpa_get_dma_dev(vdpa);
1301 const struct bus_type *bus;
1302 int ret;
1303
1304 /* Device want to do DMA by itself */
1305 if (ops->set_map || ops->dma_map)
1306 return 0;
1307
1308 bus = dma_dev->bus;
1309 if (!bus)
1310 return -EFAULT;
1311
1312 if (!device_iommu_capable(dma_dev, IOMMU_CAP_CACHE_COHERENCY)) {
1313 dev_warn_once(&v->dev,
1314 "Failed to allocate domain, device is not IOMMU cache coherent capable\n");
1315 return -ENOTSUPP;
1316 }
1317
1318 v->domain = iommu_domain_alloc(bus);
1319 if (!v->domain)
1320 return -EIO;
1321
1322 ret = iommu_attach_device(v->domain, dma_dev);
1323 if (ret)
1324 goto err_attach;
1325
1326 return 0;
1327
1328err_attach:
1329 iommu_domain_free(v->domain);
1330 v->domain = NULL;
1331 return ret;
1332}
1333
1334static void vhost_vdpa_free_domain(struct vhost_vdpa *v)
1335{
1336 struct vdpa_device *vdpa = v->vdpa;
1337 struct device *dma_dev = vdpa_get_dma_dev(vdpa);
1338
1339 if (v->domain) {
1340 iommu_detach_device(v->domain, dma_dev);
1341 iommu_domain_free(v->domain);
1342 }
1343
1344 v->domain = NULL;
1345}
1346
1347static void vhost_vdpa_set_iova_range(struct vhost_vdpa *v)
1348{
1349 struct vdpa_iova_range *range = &v->range;
1350 struct vdpa_device *vdpa = v->vdpa;
1351 const struct vdpa_config_ops *ops = vdpa->config;
1352
1353 if (ops->get_iova_range) {
1354 *range = ops->get_iova_range(vdpa);
1355 } else if (v->domain && v->domain->geometry.force_aperture) {
1356 range->first = v->domain->geometry.aperture_start;
1357 range->last = v->domain->geometry.aperture_end;
1358 } else {
1359 range->first = 0;
1360 range->last = ULLONG_MAX;
1361 }
1362}
1363
1364static void vhost_vdpa_cleanup(struct vhost_vdpa *v)
1365{
1366 struct vhost_vdpa_as *as;
1367 u32 asid;
1368
1369 for (asid = 0; asid < v->vdpa->nas; asid++) {
1370 as = asid_to_as(v, asid);
1371 if (as)
1372 vhost_vdpa_remove_as(v, asid);
1373 }
1374
1375 vhost_vdpa_free_domain(v);
1376 vhost_dev_cleanup(&v->vdev);
1377 kfree(v->vdev.vqs);
1378 v->vdev.vqs = NULL;
1379}
1380
1381static int vhost_vdpa_open(struct inode *inode, struct file *filep)
1382{
1383 struct vhost_vdpa *v;
1384 struct vhost_dev *dev;
1385 struct vhost_virtqueue **vqs;
1386 int r, opened;
1387 u32 i, nvqs;
1388
1389 v = container_of(inode->i_cdev, struct vhost_vdpa, cdev);
1390
1391 opened = atomic_cmpxchg(&v->opened, 0, 1);
1392 if (opened)
1393 return -EBUSY;
1394
1395 nvqs = v->nvqs;
1396 r = vhost_vdpa_reset(v);
1397 if (r)
1398 goto err;
1399
1400 vqs = kmalloc_array(nvqs, sizeof(*vqs), GFP_KERNEL);
1401 if (!vqs) {
1402 r = -ENOMEM;
1403 goto err;
1404 }
1405
1406 dev = &v->vdev;
1407 for (i = 0; i < nvqs; i++) {
1408 vqs[i] = &v->vqs[i];
1409 vqs[i]->handle_kick = handle_vq_kick;
1410 }
1411 vhost_dev_init(dev, vqs, nvqs, 0, 0, 0, false,
1412 vhost_vdpa_process_iotlb_msg);
1413
1414 r = vhost_vdpa_alloc_domain(v);
1415 if (r)
1416 goto err_alloc_domain;
1417
1418 vhost_vdpa_set_iova_range(v);
1419
1420 filep->private_data = v;
1421
1422 return 0;
1423
1424err_alloc_domain:
1425 vhost_vdpa_cleanup(v);
1426err:
1427 atomic_dec(&v->opened);
1428 return r;
1429}
1430
1431static void vhost_vdpa_clean_irq(struct vhost_vdpa *v)
1432{
1433 u32 i;
1434
1435 for (i = 0; i < v->nvqs; i++)
1436 vhost_vdpa_unsetup_vq_irq(v, i);
1437}
1438
1439static int vhost_vdpa_release(struct inode *inode, struct file *filep)
1440{
1441 struct vhost_vdpa *v = filep->private_data;
1442 struct vhost_dev *d = &v->vdev;
1443
1444 mutex_lock(&d->mutex);
1445 filep->private_data = NULL;
1446 vhost_vdpa_clean_irq(v);
1447 vhost_vdpa_reset(v);
1448 vhost_dev_stop(&v->vdev);
1449 vhost_vdpa_unbind_mm(v);
1450 vhost_vdpa_config_put(v);
1451 vhost_vdpa_cleanup(v);
1452 mutex_unlock(&d->mutex);
1453
1454 atomic_dec(&v->opened);
1455 complete(&v->completion);
1456
1457 return 0;
1458}
1459
1460#ifdef CONFIG_MMU
1461static vm_fault_t vhost_vdpa_fault(struct vm_fault *vmf)
1462{
1463 struct vhost_vdpa *v = vmf->vma->vm_file->private_data;
1464 struct vdpa_device *vdpa = v->vdpa;
1465 const struct vdpa_config_ops *ops = vdpa->config;
1466 struct vdpa_notification_area notify;
1467 struct vm_area_struct *vma = vmf->vma;
1468 u16 index = vma->vm_pgoff;
1469
1470 notify = ops->get_vq_notification(vdpa, index);
1471
1472 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1473 if (remap_pfn_range(vma, vmf->address & PAGE_MASK,
1474 PFN_DOWN(notify.addr), PAGE_SIZE,
1475 vma->vm_page_prot))
1476 return VM_FAULT_SIGBUS;
1477
1478 return VM_FAULT_NOPAGE;
1479}
1480
1481static const struct vm_operations_struct vhost_vdpa_vm_ops = {
1482 .fault = vhost_vdpa_fault,
1483};
1484
1485static int vhost_vdpa_mmap(struct file *file, struct vm_area_struct *vma)
1486{
1487 struct vhost_vdpa *v = vma->vm_file->private_data;
1488 struct vdpa_device *vdpa = v->vdpa;
1489 const struct vdpa_config_ops *ops = vdpa->config;
1490 struct vdpa_notification_area notify;
1491 unsigned long index = vma->vm_pgoff;
1492
1493 if (vma->vm_end - vma->vm_start != PAGE_SIZE)
1494 return -EINVAL;
1495 if ((vma->vm_flags & VM_SHARED) == 0)
1496 return -EINVAL;
1497 if (vma->vm_flags & VM_READ)
1498 return -EINVAL;
1499 if (index > 65535)
1500 return -EINVAL;
1501 if (!ops->get_vq_notification)
1502 return -ENOTSUPP;
1503
1504 /* To be safe and easily modelled by userspace, We only
1505 * support the doorbell which sits on the page boundary and
1506 * does not share the page with other registers.
1507 */
1508 notify = ops->get_vq_notification(vdpa, index);
1509 if (notify.addr & (PAGE_SIZE - 1))
1510 return -EINVAL;
1511 if (vma->vm_end - vma->vm_start != notify.size)
1512 return -ENOTSUPP;
1513
1514 vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);
1515 vma->vm_ops = &vhost_vdpa_vm_ops;
1516 return 0;
1517}
1518#endif /* CONFIG_MMU */
1519
1520static const struct file_operations vhost_vdpa_fops = {
1521 .owner = THIS_MODULE,
1522 .open = vhost_vdpa_open,
1523 .release = vhost_vdpa_release,
1524 .write_iter = vhost_vdpa_chr_write_iter,
1525 .unlocked_ioctl = vhost_vdpa_unlocked_ioctl,
1526#ifdef CONFIG_MMU
1527 .mmap = vhost_vdpa_mmap,
1528#endif /* CONFIG_MMU */
1529 .compat_ioctl = compat_ptr_ioctl,
1530};
1531
1532static void vhost_vdpa_release_dev(struct device *device)
1533{
1534 struct vhost_vdpa *v =
1535 container_of(device, struct vhost_vdpa, dev);
1536
1537 ida_simple_remove(&vhost_vdpa_ida, v->minor);
1538 kfree(v->vqs);
1539 kfree(v);
1540}
1541
1542static int vhost_vdpa_probe(struct vdpa_device *vdpa)
1543{
1544 const struct vdpa_config_ops *ops = vdpa->config;
1545 struct vhost_vdpa *v;
1546 int minor;
1547 int i, r;
1548
1549 /* We can't support platform IOMMU device with more than 1
1550 * group or as
1551 */
1552 if (!ops->set_map && !ops->dma_map &&
1553 (vdpa->ngroups > 1 || vdpa->nas > 1))
1554 return -EOPNOTSUPP;
1555
1556 v = kzalloc(sizeof(*v), GFP_KERNEL | __GFP_RETRY_MAYFAIL);
1557 if (!v)
1558 return -ENOMEM;
1559
1560 minor = ida_simple_get(&vhost_vdpa_ida, 0,
1561 VHOST_VDPA_DEV_MAX, GFP_KERNEL);
1562 if (minor < 0) {
1563 kfree(v);
1564 return minor;
1565 }
1566
1567 atomic_set(&v->opened, 0);
1568 v->minor = minor;
1569 v->vdpa = vdpa;
1570 v->nvqs = vdpa->nvqs;
1571 v->virtio_id = ops->get_device_id(vdpa);
1572
1573 device_initialize(&v->dev);
1574 v->dev.release = vhost_vdpa_release_dev;
1575 v->dev.parent = &vdpa->dev;
1576 v->dev.devt = MKDEV(MAJOR(vhost_vdpa_major), minor);
1577 v->vqs = kmalloc_array(v->nvqs, sizeof(struct vhost_virtqueue),
1578 GFP_KERNEL);
1579 if (!v->vqs) {
1580 r = -ENOMEM;
1581 goto err;
1582 }
1583
1584 r = dev_set_name(&v->dev, "vhost-vdpa-%u", minor);
1585 if (r)
1586 goto err;
1587
1588 cdev_init(&v->cdev, &vhost_vdpa_fops);
1589 v->cdev.owner = THIS_MODULE;
1590
1591 r = cdev_device_add(&v->cdev, &v->dev);
1592 if (r)
1593 goto err;
1594
1595 init_completion(&v->completion);
1596 vdpa_set_drvdata(vdpa, v);
1597
1598 for (i = 0; i < VHOST_VDPA_IOTLB_BUCKETS; i++)
1599 INIT_HLIST_HEAD(&v->as[i]);
1600
1601 return 0;
1602
1603err:
1604 put_device(&v->dev);
1605 return r;
1606}
1607
1608static void vhost_vdpa_remove(struct vdpa_device *vdpa)
1609{
1610 struct vhost_vdpa *v = vdpa_get_drvdata(vdpa);
1611 int opened;
1612
1613 cdev_device_del(&v->cdev, &v->dev);
1614
1615 do {
1616 opened = atomic_cmpxchg(&v->opened, 0, 1);
1617 if (!opened)
1618 break;
1619 wait_for_completion(&v->completion);
1620 } while (1);
1621
1622 put_device(&v->dev);
1623}
1624
1625static struct vdpa_driver vhost_vdpa_driver = {
1626 .driver = {
1627 .name = "vhost_vdpa",
1628 },
1629 .probe = vhost_vdpa_probe,
1630 .remove = vhost_vdpa_remove,
1631};
1632
1633static int __init vhost_vdpa_init(void)
1634{
1635 int r;
1636
1637 r = alloc_chrdev_region(&vhost_vdpa_major, 0, VHOST_VDPA_DEV_MAX,
1638 "vhost-vdpa");
1639 if (r)
1640 goto err_alloc_chrdev;
1641
1642 r = vdpa_register_driver(&vhost_vdpa_driver);
1643 if (r)
1644 goto err_vdpa_register_driver;
1645
1646 return 0;
1647
1648err_vdpa_register_driver:
1649 unregister_chrdev_region(vhost_vdpa_major, VHOST_VDPA_DEV_MAX);
1650err_alloc_chrdev:
1651 return r;
1652}
1653module_init(vhost_vdpa_init);
1654
1655static void __exit vhost_vdpa_exit(void)
1656{
1657 vdpa_unregister_driver(&vhost_vdpa_driver);
1658 unregister_chrdev_region(vhost_vdpa_major, VHOST_VDPA_DEV_MAX);
1659}
1660module_exit(vhost_vdpa_exit);
1661
1662MODULE_VERSION("0.0.1");
1663MODULE_LICENSE("GPL v2");
1664MODULE_AUTHOR("Intel Corporation");
1665MODULE_DESCRIPTION("vDPA-based vhost backend for virtio");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2018-2020 Intel Corporation.
4 * Copyright (C) 2020 Red Hat, Inc.
5 *
6 * Author: Tiwei Bie <tiwei.bie@intel.com>
7 * Jason Wang <jasowang@redhat.com>
8 *
9 * Thanks Michael S. Tsirkin for the valuable comments and
10 * suggestions. And thanks to Cunming Liang and Zhihong Wang for all
11 * their supports.
12 */
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/cdev.h>
17#include <linux/device.h>
18#include <linux/mm.h>
19#include <linux/iommu.h>
20#include <linux/uuid.h>
21#include <linux/vdpa.h>
22#include <linux/nospec.h>
23#include <linux/vhost.h>
24#include <linux/virtio_net.h>
25#include <linux/kernel.h>
26
27#include "vhost.h"
28
29enum {
30 VHOST_VDPA_BACKEND_FEATURES =
31 (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2) |
32 (1ULL << VHOST_BACKEND_F_IOTLB_BATCH),
33};
34
35#define VHOST_VDPA_DEV_MAX (1U << MINORBITS)
36
37struct vhost_vdpa {
38 struct vhost_dev vdev;
39 struct iommu_domain *domain;
40 struct vhost_virtqueue *vqs;
41 struct completion completion;
42 struct vdpa_device *vdpa;
43 struct device dev;
44 struct cdev cdev;
45 atomic_t opened;
46 int nvqs;
47 int virtio_id;
48 int minor;
49 struct eventfd_ctx *config_ctx;
50 int in_batch;
51};
52
53static DEFINE_IDA(vhost_vdpa_ida);
54
55static dev_t vhost_vdpa_major;
56
57static void handle_vq_kick(struct vhost_work *work)
58{
59 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
60 poll.work);
61 struct vhost_vdpa *v = container_of(vq->dev, struct vhost_vdpa, vdev);
62 const struct vdpa_config_ops *ops = v->vdpa->config;
63
64 ops->kick_vq(v->vdpa, vq - v->vqs);
65}
66
67static irqreturn_t vhost_vdpa_virtqueue_cb(void *private)
68{
69 struct vhost_virtqueue *vq = private;
70 struct eventfd_ctx *call_ctx = vq->call_ctx.ctx;
71
72 if (call_ctx)
73 eventfd_signal(call_ctx, 1);
74
75 return IRQ_HANDLED;
76}
77
78static irqreturn_t vhost_vdpa_config_cb(void *private)
79{
80 struct vhost_vdpa *v = private;
81 struct eventfd_ctx *config_ctx = v->config_ctx;
82
83 if (config_ctx)
84 eventfd_signal(config_ctx, 1);
85
86 return IRQ_HANDLED;
87}
88
89static void vhost_vdpa_setup_vq_irq(struct vhost_vdpa *v, u16 qid)
90{
91 struct vhost_virtqueue *vq = &v->vqs[qid];
92 const struct vdpa_config_ops *ops = v->vdpa->config;
93 struct vdpa_device *vdpa = v->vdpa;
94 int ret, irq;
95
96 if (!ops->get_vq_irq)
97 return;
98
99 irq = ops->get_vq_irq(vdpa, qid);
100 spin_lock(&vq->call_ctx.ctx_lock);
101 irq_bypass_unregister_producer(&vq->call_ctx.producer);
102 if (!vq->call_ctx.ctx || irq < 0) {
103 spin_unlock(&vq->call_ctx.ctx_lock);
104 return;
105 }
106
107 vq->call_ctx.producer.token = vq->call_ctx.ctx;
108 vq->call_ctx.producer.irq = irq;
109 ret = irq_bypass_register_producer(&vq->call_ctx.producer);
110 spin_unlock(&vq->call_ctx.ctx_lock);
111}
112
113static void vhost_vdpa_unsetup_vq_irq(struct vhost_vdpa *v, u16 qid)
114{
115 struct vhost_virtqueue *vq = &v->vqs[qid];
116
117 spin_lock(&vq->call_ctx.ctx_lock);
118 irq_bypass_unregister_producer(&vq->call_ctx.producer);
119 spin_unlock(&vq->call_ctx.ctx_lock);
120}
121
122static void vhost_vdpa_reset(struct vhost_vdpa *v)
123{
124 struct vdpa_device *vdpa = v->vdpa;
125
126 vdpa_reset(vdpa);
127 v->in_batch = 0;
128}
129
130static long vhost_vdpa_get_device_id(struct vhost_vdpa *v, u8 __user *argp)
131{
132 struct vdpa_device *vdpa = v->vdpa;
133 const struct vdpa_config_ops *ops = vdpa->config;
134 u32 device_id;
135
136 device_id = ops->get_device_id(vdpa);
137
138 if (copy_to_user(argp, &device_id, sizeof(device_id)))
139 return -EFAULT;
140
141 return 0;
142}
143
144static long vhost_vdpa_get_status(struct vhost_vdpa *v, u8 __user *statusp)
145{
146 struct vdpa_device *vdpa = v->vdpa;
147 const struct vdpa_config_ops *ops = vdpa->config;
148 u8 status;
149
150 status = ops->get_status(vdpa);
151
152 if (copy_to_user(statusp, &status, sizeof(status)))
153 return -EFAULT;
154
155 return 0;
156}
157
158static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp)
159{
160 struct vdpa_device *vdpa = v->vdpa;
161 const struct vdpa_config_ops *ops = vdpa->config;
162 u8 status, status_old;
163 int nvqs = v->nvqs;
164 u16 i;
165
166 if (copy_from_user(&status, statusp, sizeof(status)))
167 return -EFAULT;
168
169 status_old = ops->get_status(vdpa);
170
171 /*
172 * Userspace shouldn't remove status bits unless reset the
173 * status to 0.
174 */
175 if (status != 0 && (ops->get_status(vdpa) & ~status) != 0)
176 return -EINVAL;
177
178 ops->set_status(vdpa, status);
179
180 if ((status & VIRTIO_CONFIG_S_DRIVER_OK) && !(status_old & VIRTIO_CONFIG_S_DRIVER_OK))
181 for (i = 0; i < nvqs; i++)
182 vhost_vdpa_setup_vq_irq(v, i);
183
184 if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) && !(status & VIRTIO_CONFIG_S_DRIVER_OK))
185 for (i = 0; i < nvqs; i++)
186 vhost_vdpa_unsetup_vq_irq(v, i);
187
188 return 0;
189}
190
191static int vhost_vdpa_config_validate(struct vhost_vdpa *v,
192 struct vhost_vdpa_config *c)
193{
194 long size = 0;
195
196 switch (v->virtio_id) {
197 case VIRTIO_ID_NET:
198 size = sizeof(struct virtio_net_config);
199 break;
200 }
201
202 if (c->len == 0)
203 return -EINVAL;
204
205 if (c->len > size - c->off)
206 return -E2BIG;
207
208 return 0;
209}
210
211static long vhost_vdpa_get_config(struct vhost_vdpa *v,
212 struct vhost_vdpa_config __user *c)
213{
214 struct vdpa_device *vdpa = v->vdpa;
215 struct vhost_vdpa_config config;
216 unsigned long size = offsetof(struct vhost_vdpa_config, buf);
217 u8 *buf;
218
219 if (copy_from_user(&config, c, size))
220 return -EFAULT;
221 if (vhost_vdpa_config_validate(v, &config))
222 return -EINVAL;
223 buf = kvzalloc(config.len, GFP_KERNEL);
224 if (!buf)
225 return -ENOMEM;
226
227 vdpa_get_config(vdpa, config.off, buf, config.len);
228
229 if (copy_to_user(c->buf, buf, config.len)) {
230 kvfree(buf);
231 return -EFAULT;
232 }
233
234 kvfree(buf);
235 return 0;
236}
237
238static long vhost_vdpa_set_config(struct vhost_vdpa *v,
239 struct vhost_vdpa_config __user *c)
240{
241 struct vdpa_device *vdpa = v->vdpa;
242 const struct vdpa_config_ops *ops = vdpa->config;
243 struct vhost_vdpa_config config;
244 unsigned long size = offsetof(struct vhost_vdpa_config, buf);
245 u8 *buf;
246
247 if (copy_from_user(&config, c, size))
248 return -EFAULT;
249 if (vhost_vdpa_config_validate(v, &config))
250 return -EINVAL;
251 buf = kvzalloc(config.len, GFP_KERNEL);
252 if (!buf)
253 return -ENOMEM;
254
255 if (copy_from_user(buf, c->buf, config.len)) {
256 kvfree(buf);
257 return -EFAULT;
258 }
259
260 ops->set_config(vdpa, config.off, buf, config.len);
261
262 kvfree(buf);
263 return 0;
264}
265
266static long vhost_vdpa_get_features(struct vhost_vdpa *v, u64 __user *featurep)
267{
268 struct vdpa_device *vdpa = v->vdpa;
269 const struct vdpa_config_ops *ops = vdpa->config;
270 u64 features;
271
272 features = ops->get_features(vdpa);
273
274 if (copy_to_user(featurep, &features, sizeof(features)))
275 return -EFAULT;
276
277 return 0;
278}
279
280static long vhost_vdpa_set_features(struct vhost_vdpa *v, u64 __user *featurep)
281{
282 struct vdpa_device *vdpa = v->vdpa;
283 const struct vdpa_config_ops *ops = vdpa->config;
284 u64 features;
285
286 /*
287 * It's not allowed to change the features after they have
288 * been negotiated.
289 */
290 if (ops->get_status(vdpa) & VIRTIO_CONFIG_S_FEATURES_OK)
291 return -EBUSY;
292
293 if (copy_from_user(&features, featurep, sizeof(features)))
294 return -EFAULT;
295
296 if (vdpa_set_features(vdpa, features))
297 return -EINVAL;
298
299 return 0;
300}
301
302static long vhost_vdpa_get_vring_num(struct vhost_vdpa *v, u16 __user *argp)
303{
304 struct vdpa_device *vdpa = v->vdpa;
305 const struct vdpa_config_ops *ops = vdpa->config;
306 u16 num;
307
308 num = ops->get_vq_num_max(vdpa);
309
310 if (copy_to_user(argp, &num, sizeof(num)))
311 return -EFAULT;
312
313 return 0;
314}
315
316static void vhost_vdpa_config_put(struct vhost_vdpa *v)
317{
318 if (v->config_ctx)
319 eventfd_ctx_put(v->config_ctx);
320}
321
322static long vhost_vdpa_set_config_call(struct vhost_vdpa *v, u32 __user *argp)
323{
324 struct vdpa_callback cb;
325 int fd;
326 struct eventfd_ctx *ctx;
327
328 cb.callback = vhost_vdpa_config_cb;
329 cb.private = v->vdpa;
330 if (copy_from_user(&fd, argp, sizeof(fd)))
331 return -EFAULT;
332
333 ctx = fd == VHOST_FILE_UNBIND ? NULL : eventfd_ctx_fdget(fd);
334 swap(ctx, v->config_ctx);
335
336 if (!IS_ERR_OR_NULL(ctx))
337 eventfd_ctx_put(ctx);
338
339 if (IS_ERR(v->config_ctx))
340 return PTR_ERR(v->config_ctx);
341
342 v->vdpa->config->set_config_cb(v->vdpa, &cb);
343
344 return 0;
345}
346
347static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
348 void __user *argp)
349{
350 struct vdpa_device *vdpa = v->vdpa;
351 const struct vdpa_config_ops *ops = vdpa->config;
352 struct vdpa_vq_state vq_state;
353 struct vdpa_callback cb;
354 struct vhost_virtqueue *vq;
355 struct vhost_vring_state s;
356 u32 idx;
357 long r;
358
359 r = get_user(idx, (u32 __user *)argp);
360 if (r < 0)
361 return r;
362
363 if (idx >= v->nvqs)
364 return -ENOBUFS;
365
366 idx = array_index_nospec(idx, v->nvqs);
367 vq = &v->vqs[idx];
368
369 switch (cmd) {
370 case VHOST_VDPA_SET_VRING_ENABLE:
371 if (copy_from_user(&s, argp, sizeof(s)))
372 return -EFAULT;
373 ops->set_vq_ready(vdpa, idx, s.num);
374 return 0;
375 case VHOST_GET_VRING_BASE:
376 r = ops->get_vq_state(v->vdpa, idx, &vq_state);
377 if (r)
378 return r;
379
380 vq->last_avail_idx = vq_state.avail_index;
381 break;
382 }
383
384 r = vhost_vring_ioctl(&v->vdev, cmd, argp);
385 if (r)
386 return r;
387
388 switch (cmd) {
389 case VHOST_SET_VRING_ADDR:
390 if (ops->set_vq_address(vdpa, idx,
391 (u64)(uintptr_t)vq->desc,
392 (u64)(uintptr_t)vq->avail,
393 (u64)(uintptr_t)vq->used))
394 r = -EINVAL;
395 break;
396
397 case VHOST_SET_VRING_BASE:
398 vq_state.avail_index = vq->last_avail_idx;
399 if (ops->set_vq_state(vdpa, idx, &vq_state))
400 r = -EINVAL;
401 break;
402
403 case VHOST_SET_VRING_CALL:
404 if (vq->call_ctx.ctx) {
405 cb.callback = vhost_vdpa_virtqueue_cb;
406 cb.private = vq;
407 } else {
408 cb.callback = NULL;
409 cb.private = NULL;
410 }
411 ops->set_vq_cb(vdpa, idx, &cb);
412 vhost_vdpa_setup_vq_irq(v, idx);
413 break;
414
415 case VHOST_SET_VRING_NUM:
416 ops->set_vq_num(vdpa, idx, vq->num);
417 break;
418 }
419
420 return r;
421}
422
423static long vhost_vdpa_unlocked_ioctl(struct file *filep,
424 unsigned int cmd, unsigned long arg)
425{
426 struct vhost_vdpa *v = filep->private_data;
427 struct vhost_dev *d = &v->vdev;
428 void __user *argp = (void __user *)arg;
429 u64 __user *featurep = argp;
430 u64 features;
431 long r;
432
433 if (cmd == VHOST_SET_BACKEND_FEATURES) {
434 r = copy_from_user(&features, featurep, sizeof(features));
435 if (r)
436 return r;
437 if (features & ~VHOST_VDPA_BACKEND_FEATURES)
438 return -EOPNOTSUPP;
439 vhost_set_backend_features(&v->vdev, features);
440 return 0;
441 }
442
443 mutex_lock(&d->mutex);
444
445 switch (cmd) {
446 case VHOST_VDPA_GET_DEVICE_ID:
447 r = vhost_vdpa_get_device_id(v, argp);
448 break;
449 case VHOST_VDPA_GET_STATUS:
450 r = vhost_vdpa_get_status(v, argp);
451 break;
452 case VHOST_VDPA_SET_STATUS:
453 r = vhost_vdpa_set_status(v, argp);
454 break;
455 case VHOST_VDPA_GET_CONFIG:
456 r = vhost_vdpa_get_config(v, argp);
457 break;
458 case VHOST_VDPA_SET_CONFIG:
459 r = vhost_vdpa_set_config(v, argp);
460 break;
461 case VHOST_GET_FEATURES:
462 r = vhost_vdpa_get_features(v, argp);
463 break;
464 case VHOST_SET_FEATURES:
465 r = vhost_vdpa_set_features(v, argp);
466 break;
467 case VHOST_VDPA_GET_VRING_NUM:
468 r = vhost_vdpa_get_vring_num(v, argp);
469 break;
470 case VHOST_SET_LOG_BASE:
471 case VHOST_SET_LOG_FD:
472 r = -ENOIOCTLCMD;
473 break;
474 case VHOST_VDPA_SET_CONFIG_CALL:
475 r = vhost_vdpa_set_config_call(v, argp);
476 break;
477 case VHOST_GET_BACKEND_FEATURES:
478 features = VHOST_VDPA_BACKEND_FEATURES;
479 r = copy_to_user(featurep, &features, sizeof(features));
480 break;
481 default:
482 r = vhost_dev_ioctl(&v->vdev, cmd, argp);
483 if (r == -ENOIOCTLCMD)
484 r = vhost_vdpa_vring_ioctl(v, cmd, argp);
485 break;
486 }
487
488 mutex_unlock(&d->mutex);
489 return r;
490}
491
492static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v, u64 start, u64 last)
493{
494 struct vhost_dev *dev = &v->vdev;
495 struct vhost_iotlb *iotlb = dev->iotlb;
496 struct vhost_iotlb_map *map;
497 struct page *page;
498 unsigned long pfn, pinned;
499
500 while ((map = vhost_iotlb_itree_first(iotlb, start, last)) != NULL) {
501 pinned = map->size >> PAGE_SHIFT;
502 for (pfn = map->addr >> PAGE_SHIFT;
503 pinned > 0; pfn++, pinned--) {
504 page = pfn_to_page(pfn);
505 if (map->perm & VHOST_ACCESS_WO)
506 set_page_dirty_lock(page);
507 unpin_user_page(page);
508 }
509 atomic64_sub(map->size >> PAGE_SHIFT, &dev->mm->pinned_vm);
510 vhost_iotlb_map_free(iotlb, map);
511 }
512}
513
514static void vhost_vdpa_iotlb_free(struct vhost_vdpa *v)
515{
516 struct vhost_dev *dev = &v->vdev;
517
518 vhost_vdpa_iotlb_unmap(v, 0ULL, 0ULL - 1);
519 kfree(dev->iotlb);
520 dev->iotlb = NULL;
521}
522
523static int perm_to_iommu_flags(u32 perm)
524{
525 int flags = 0;
526
527 switch (perm) {
528 case VHOST_ACCESS_WO:
529 flags |= IOMMU_WRITE;
530 break;
531 case VHOST_ACCESS_RO:
532 flags |= IOMMU_READ;
533 break;
534 case VHOST_ACCESS_RW:
535 flags |= (IOMMU_WRITE | IOMMU_READ);
536 break;
537 default:
538 WARN(1, "invalidate vhost IOTLB permission\n");
539 break;
540 }
541
542 return flags | IOMMU_CACHE;
543}
544
545static int vhost_vdpa_map(struct vhost_vdpa *v,
546 u64 iova, u64 size, u64 pa, u32 perm)
547{
548 struct vhost_dev *dev = &v->vdev;
549 struct vdpa_device *vdpa = v->vdpa;
550 const struct vdpa_config_ops *ops = vdpa->config;
551 int r = 0;
552
553 r = vhost_iotlb_add_range(dev->iotlb, iova, iova + size - 1,
554 pa, perm);
555 if (r)
556 return r;
557
558 if (ops->dma_map) {
559 r = ops->dma_map(vdpa, iova, size, pa, perm);
560 } else if (ops->set_map) {
561 if (!v->in_batch)
562 r = ops->set_map(vdpa, dev->iotlb);
563 } else {
564 r = iommu_map(v->domain, iova, pa, size,
565 perm_to_iommu_flags(perm));
566 }
567
568 if (r)
569 vhost_iotlb_del_range(dev->iotlb, iova, iova + size - 1);
570
571 return r;
572}
573
574static void vhost_vdpa_unmap(struct vhost_vdpa *v, u64 iova, u64 size)
575{
576 struct vhost_dev *dev = &v->vdev;
577 struct vdpa_device *vdpa = v->vdpa;
578 const struct vdpa_config_ops *ops = vdpa->config;
579
580 vhost_vdpa_iotlb_unmap(v, iova, iova + size - 1);
581
582 if (ops->dma_map) {
583 ops->dma_unmap(vdpa, iova, size);
584 } else if (ops->set_map) {
585 if (!v->in_batch)
586 ops->set_map(vdpa, dev->iotlb);
587 } else {
588 iommu_unmap(v->domain, iova, size);
589 }
590}
591
592static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v,
593 struct vhost_iotlb_msg *msg)
594{
595 struct vhost_dev *dev = &v->vdev;
596 struct vhost_iotlb *iotlb = dev->iotlb;
597 struct page **page_list;
598 struct vm_area_struct **vmas;
599 unsigned int gup_flags = FOLL_LONGTERM;
600 unsigned long map_pfn, last_pfn = 0;
601 unsigned long npages, lock_limit;
602 unsigned long i, nmap = 0;
603 u64 iova = msg->iova;
604 long pinned;
605 int ret = 0;
606
607 if (vhost_iotlb_itree_first(iotlb, msg->iova,
608 msg->iova + msg->size - 1))
609 return -EEXIST;
610
611 if (msg->perm & VHOST_ACCESS_WO)
612 gup_flags |= FOLL_WRITE;
613
614 npages = PAGE_ALIGN(msg->size + (iova & ~PAGE_MASK)) >> PAGE_SHIFT;
615 if (!npages)
616 return -EINVAL;
617
618 page_list = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
619 vmas = kvmalloc_array(npages, sizeof(struct vm_area_struct *),
620 GFP_KERNEL);
621 if (!page_list || !vmas) {
622 ret = -ENOMEM;
623 goto free;
624 }
625
626 mmap_read_lock(dev->mm);
627
628 lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
629 if (npages + atomic64_read(&dev->mm->pinned_vm) > lock_limit) {
630 ret = -ENOMEM;
631 goto unlock;
632 }
633
634 pinned = pin_user_pages(msg->uaddr & PAGE_MASK, npages, gup_flags,
635 page_list, vmas);
636 if (npages != pinned) {
637 if (pinned < 0) {
638 ret = pinned;
639 } else {
640 unpin_user_pages(page_list, pinned);
641 ret = -ENOMEM;
642 }
643 goto unlock;
644 }
645
646 iova &= PAGE_MASK;
647 map_pfn = page_to_pfn(page_list[0]);
648
649 /* One more iteration to avoid extra vdpa_map() call out of loop. */
650 for (i = 0; i <= npages; i++) {
651 unsigned long this_pfn;
652 u64 csize;
653
654 /* The last chunk may have no valid PFN next to it */
655 this_pfn = i < npages ? page_to_pfn(page_list[i]) : -1UL;
656
657 if (last_pfn && (this_pfn == -1UL ||
658 this_pfn != last_pfn + 1)) {
659 /* Pin a contiguous chunk of memory */
660 csize = last_pfn - map_pfn + 1;
661 ret = vhost_vdpa_map(v, iova, csize << PAGE_SHIFT,
662 map_pfn << PAGE_SHIFT,
663 msg->perm);
664 if (ret) {
665 /*
666 * Unpin the rest chunks of memory on the
667 * flight with no corresponding vdpa_map()
668 * calls having been made yet. On the other
669 * hand, vdpa_unmap() in the failure path
670 * is in charge of accounting the number of
671 * pinned pages for its own.
672 * This asymmetrical pattern of accounting
673 * is for efficiency to pin all pages at
674 * once, while there is no other callsite
675 * of vdpa_map() than here above.
676 */
677 unpin_user_pages(&page_list[nmap],
678 npages - nmap);
679 goto out;
680 }
681 atomic64_add(csize, &dev->mm->pinned_vm);
682 nmap += csize;
683 iova += csize << PAGE_SHIFT;
684 map_pfn = this_pfn;
685 }
686 last_pfn = this_pfn;
687 }
688
689 WARN_ON(nmap != npages);
690out:
691 if (ret)
692 vhost_vdpa_unmap(v, msg->iova, msg->size);
693unlock:
694 mmap_read_unlock(dev->mm);
695free:
696 kvfree(vmas);
697 kvfree(page_list);
698 return ret;
699}
700
701static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev,
702 struct vhost_iotlb_msg *msg)
703{
704 struct vhost_vdpa *v = container_of(dev, struct vhost_vdpa, vdev);
705 struct vdpa_device *vdpa = v->vdpa;
706 const struct vdpa_config_ops *ops = vdpa->config;
707 int r = 0;
708
709 r = vhost_dev_check_owner(dev);
710 if (r)
711 return r;
712
713 switch (msg->type) {
714 case VHOST_IOTLB_UPDATE:
715 r = vhost_vdpa_process_iotlb_update(v, msg);
716 break;
717 case VHOST_IOTLB_INVALIDATE:
718 vhost_vdpa_unmap(v, msg->iova, msg->size);
719 break;
720 case VHOST_IOTLB_BATCH_BEGIN:
721 v->in_batch = true;
722 break;
723 case VHOST_IOTLB_BATCH_END:
724 if (v->in_batch && ops->set_map)
725 ops->set_map(vdpa, dev->iotlb);
726 v->in_batch = false;
727 break;
728 default:
729 r = -EINVAL;
730 break;
731 }
732
733 return r;
734}
735
736static ssize_t vhost_vdpa_chr_write_iter(struct kiocb *iocb,
737 struct iov_iter *from)
738{
739 struct file *file = iocb->ki_filp;
740 struct vhost_vdpa *v = file->private_data;
741 struct vhost_dev *dev = &v->vdev;
742
743 return vhost_chr_write_iter(dev, from);
744}
745
746static int vhost_vdpa_alloc_domain(struct vhost_vdpa *v)
747{
748 struct vdpa_device *vdpa = v->vdpa;
749 const struct vdpa_config_ops *ops = vdpa->config;
750 struct device *dma_dev = vdpa_get_dma_dev(vdpa);
751 struct bus_type *bus;
752 int ret;
753
754 /* Device want to do DMA by itself */
755 if (ops->set_map || ops->dma_map)
756 return 0;
757
758 bus = dma_dev->bus;
759 if (!bus)
760 return -EFAULT;
761
762 if (!iommu_capable(bus, IOMMU_CAP_CACHE_COHERENCY))
763 return -ENOTSUPP;
764
765 v->domain = iommu_domain_alloc(bus);
766 if (!v->domain)
767 return -EIO;
768
769 ret = iommu_attach_device(v->domain, dma_dev);
770 if (ret)
771 goto err_attach;
772
773 return 0;
774
775err_attach:
776 iommu_domain_free(v->domain);
777 return ret;
778}
779
780static void vhost_vdpa_free_domain(struct vhost_vdpa *v)
781{
782 struct vdpa_device *vdpa = v->vdpa;
783 struct device *dma_dev = vdpa_get_dma_dev(vdpa);
784
785 if (v->domain) {
786 iommu_detach_device(v->domain, dma_dev);
787 iommu_domain_free(v->domain);
788 }
789
790 v->domain = NULL;
791}
792
793static int vhost_vdpa_open(struct inode *inode, struct file *filep)
794{
795 struct vhost_vdpa *v;
796 struct vhost_dev *dev;
797 struct vhost_virtqueue **vqs;
798 int nvqs, i, r, opened;
799
800 v = container_of(inode->i_cdev, struct vhost_vdpa, cdev);
801
802 opened = atomic_cmpxchg(&v->opened, 0, 1);
803 if (opened)
804 return -EBUSY;
805
806 nvqs = v->nvqs;
807 vhost_vdpa_reset(v);
808
809 vqs = kmalloc_array(nvqs, sizeof(*vqs), GFP_KERNEL);
810 if (!vqs) {
811 r = -ENOMEM;
812 goto err;
813 }
814
815 dev = &v->vdev;
816 for (i = 0; i < nvqs; i++) {
817 vqs[i] = &v->vqs[i];
818 vqs[i]->handle_kick = handle_vq_kick;
819 }
820 vhost_dev_init(dev, vqs, nvqs, 0, 0, 0, false,
821 vhost_vdpa_process_iotlb_msg);
822
823 dev->iotlb = vhost_iotlb_alloc(0, 0);
824 if (!dev->iotlb) {
825 r = -ENOMEM;
826 goto err_init_iotlb;
827 }
828
829 r = vhost_vdpa_alloc_domain(v);
830 if (r)
831 goto err_init_iotlb;
832
833 filep->private_data = v;
834
835 return 0;
836
837err_init_iotlb:
838 vhost_dev_cleanup(&v->vdev);
839 kfree(vqs);
840err:
841 atomic_dec(&v->opened);
842 return r;
843}
844
845static void vhost_vdpa_clean_irq(struct vhost_vdpa *v)
846{
847 struct vhost_virtqueue *vq;
848 int i;
849
850 for (i = 0; i < v->nvqs; i++) {
851 vq = &v->vqs[i];
852 if (vq->call_ctx.producer.irq)
853 irq_bypass_unregister_producer(&vq->call_ctx.producer);
854 }
855}
856
857static int vhost_vdpa_release(struct inode *inode, struct file *filep)
858{
859 struct vhost_vdpa *v = filep->private_data;
860 struct vhost_dev *d = &v->vdev;
861
862 mutex_lock(&d->mutex);
863 filep->private_data = NULL;
864 vhost_vdpa_reset(v);
865 vhost_dev_stop(&v->vdev);
866 vhost_vdpa_iotlb_free(v);
867 vhost_vdpa_free_domain(v);
868 vhost_vdpa_config_put(v);
869 vhost_vdpa_clean_irq(v);
870 vhost_dev_cleanup(&v->vdev);
871 kfree(v->vdev.vqs);
872 mutex_unlock(&d->mutex);
873
874 atomic_dec(&v->opened);
875 complete(&v->completion);
876
877 return 0;
878}
879
880#ifdef CONFIG_MMU
881static vm_fault_t vhost_vdpa_fault(struct vm_fault *vmf)
882{
883 struct vhost_vdpa *v = vmf->vma->vm_file->private_data;
884 struct vdpa_device *vdpa = v->vdpa;
885 const struct vdpa_config_ops *ops = vdpa->config;
886 struct vdpa_notification_area notify;
887 struct vm_area_struct *vma = vmf->vma;
888 u16 index = vma->vm_pgoff;
889
890 notify = ops->get_vq_notification(vdpa, index);
891
892 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
893 if (remap_pfn_range(vma, vmf->address & PAGE_MASK,
894 notify.addr >> PAGE_SHIFT, PAGE_SIZE,
895 vma->vm_page_prot))
896 return VM_FAULT_SIGBUS;
897
898 return VM_FAULT_NOPAGE;
899}
900
901static const struct vm_operations_struct vhost_vdpa_vm_ops = {
902 .fault = vhost_vdpa_fault,
903};
904
905static int vhost_vdpa_mmap(struct file *file, struct vm_area_struct *vma)
906{
907 struct vhost_vdpa *v = vma->vm_file->private_data;
908 struct vdpa_device *vdpa = v->vdpa;
909 const struct vdpa_config_ops *ops = vdpa->config;
910 struct vdpa_notification_area notify;
911 unsigned long index = vma->vm_pgoff;
912
913 if (vma->vm_end - vma->vm_start != PAGE_SIZE)
914 return -EINVAL;
915 if ((vma->vm_flags & VM_SHARED) == 0)
916 return -EINVAL;
917 if (vma->vm_flags & VM_READ)
918 return -EINVAL;
919 if (index > 65535)
920 return -EINVAL;
921 if (!ops->get_vq_notification)
922 return -ENOTSUPP;
923
924 /* To be safe and easily modelled by userspace, We only
925 * support the doorbell which sits on the page boundary and
926 * does not share the page with other registers.
927 */
928 notify = ops->get_vq_notification(vdpa, index);
929 if (notify.addr & (PAGE_SIZE - 1))
930 return -EINVAL;
931 if (vma->vm_end - vma->vm_start != notify.size)
932 return -ENOTSUPP;
933
934 vma->vm_ops = &vhost_vdpa_vm_ops;
935 return 0;
936}
937#endif /* CONFIG_MMU */
938
939static const struct file_operations vhost_vdpa_fops = {
940 .owner = THIS_MODULE,
941 .open = vhost_vdpa_open,
942 .release = vhost_vdpa_release,
943 .write_iter = vhost_vdpa_chr_write_iter,
944 .unlocked_ioctl = vhost_vdpa_unlocked_ioctl,
945#ifdef CONFIG_MMU
946 .mmap = vhost_vdpa_mmap,
947#endif /* CONFIG_MMU */
948 .compat_ioctl = compat_ptr_ioctl,
949};
950
951static void vhost_vdpa_release_dev(struct device *device)
952{
953 struct vhost_vdpa *v =
954 container_of(device, struct vhost_vdpa, dev);
955
956 ida_simple_remove(&vhost_vdpa_ida, v->minor);
957 kfree(v->vqs);
958 kfree(v);
959}
960
961static int vhost_vdpa_probe(struct vdpa_device *vdpa)
962{
963 const struct vdpa_config_ops *ops = vdpa->config;
964 struct vhost_vdpa *v;
965 int minor;
966 int r;
967
968 /* Currently, we only accept the network devices. */
969 if (ops->get_device_id(vdpa) != VIRTIO_ID_NET)
970 return -ENOTSUPP;
971
972 v = kzalloc(sizeof(*v), GFP_KERNEL | __GFP_RETRY_MAYFAIL);
973 if (!v)
974 return -ENOMEM;
975
976 minor = ida_simple_get(&vhost_vdpa_ida, 0,
977 VHOST_VDPA_DEV_MAX, GFP_KERNEL);
978 if (minor < 0) {
979 kfree(v);
980 return minor;
981 }
982
983 atomic_set(&v->opened, 0);
984 v->minor = minor;
985 v->vdpa = vdpa;
986 v->nvqs = vdpa->nvqs;
987 v->virtio_id = ops->get_device_id(vdpa);
988
989 device_initialize(&v->dev);
990 v->dev.release = vhost_vdpa_release_dev;
991 v->dev.parent = &vdpa->dev;
992 v->dev.devt = MKDEV(MAJOR(vhost_vdpa_major), minor);
993 v->vqs = kmalloc_array(v->nvqs, sizeof(struct vhost_virtqueue),
994 GFP_KERNEL);
995 if (!v->vqs) {
996 r = -ENOMEM;
997 goto err;
998 }
999
1000 r = dev_set_name(&v->dev, "vhost-vdpa-%u", minor);
1001 if (r)
1002 goto err;
1003
1004 cdev_init(&v->cdev, &vhost_vdpa_fops);
1005 v->cdev.owner = THIS_MODULE;
1006
1007 r = cdev_device_add(&v->cdev, &v->dev);
1008 if (r)
1009 goto err;
1010
1011 init_completion(&v->completion);
1012 vdpa_set_drvdata(vdpa, v);
1013
1014 return 0;
1015
1016err:
1017 put_device(&v->dev);
1018 return r;
1019}
1020
1021static void vhost_vdpa_remove(struct vdpa_device *vdpa)
1022{
1023 struct vhost_vdpa *v = vdpa_get_drvdata(vdpa);
1024 int opened;
1025
1026 cdev_device_del(&v->cdev, &v->dev);
1027
1028 do {
1029 opened = atomic_cmpxchg(&v->opened, 0, 1);
1030 if (!opened)
1031 break;
1032 wait_for_completion(&v->completion);
1033 } while (1);
1034
1035 put_device(&v->dev);
1036}
1037
1038static struct vdpa_driver vhost_vdpa_driver = {
1039 .driver = {
1040 .name = "vhost_vdpa",
1041 },
1042 .probe = vhost_vdpa_probe,
1043 .remove = vhost_vdpa_remove,
1044};
1045
1046static int __init vhost_vdpa_init(void)
1047{
1048 int r;
1049
1050 r = alloc_chrdev_region(&vhost_vdpa_major, 0, VHOST_VDPA_DEV_MAX,
1051 "vhost-vdpa");
1052 if (r)
1053 goto err_alloc_chrdev;
1054
1055 r = vdpa_register_driver(&vhost_vdpa_driver);
1056 if (r)
1057 goto err_vdpa_register_driver;
1058
1059 return 0;
1060
1061err_vdpa_register_driver:
1062 unregister_chrdev_region(vhost_vdpa_major, VHOST_VDPA_DEV_MAX);
1063err_alloc_chrdev:
1064 return r;
1065}
1066module_init(vhost_vdpa_init);
1067
1068static void __exit vhost_vdpa_exit(void)
1069{
1070 vdpa_unregister_driver(&vhost_vdpa_driver);
1071 unregister_chrdev_region(vhost_vdpa_major, VHOST_VDPA_DEV_MAX);
1072}
1073module_exit(vhost_vdpa_exit);
1074
1075MODULE_VERSION("0.0.1");
1076MODULE_LICENSE("GPL v2");
1077MODULE_AUTHOR("Intel Corporation");
1078MODULE_DESCRIPTION("vDPA-based vhost backend for virtio");