1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * VFIO: IOMMU DMA mapping support for Type1 IOMMU
4 *
5 * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
6 * Author: Alex Williamson <alex.williamson@redhat.com>
7 *
8 * Derived from original vfio:
9 * Copyright 2010 Cisco Systems, Inc. All rights reserved.
10 * Author: Tom Lyon, pugs@cisco.com
11 *
12 * We arbitrarily define a Type1 IOMMU as one matching the below code.
13 * It could be called the x86 IOMMU as it's designed for AMD-Vi & Intel
14 * VT-d, but that makes it harder to re-use as theoretically anyone
15 * implementing a similar IOMMU could make use of this. We expect the
16 * IOMMU to support the IOMMU API and have few to no restrictions around
17 * the IOVA range that can be mapped. The Type1 IOMMU is currently
18 * optimized for relatively static mappings of a userspace process with
19 * userspace pages pinned into memory. We also assume devices and IOMMU
20 * domains are PCI based as the IOMMU API is still centered around a
21 * device/bus interface rather than a group interface.
22 */
23
24 #include <linux/compat.h>
25 #include <linux/device.h>
26 #include <linux/fs.h>
27 #include <linux/highmem.h>
28 #include <linux/iommu.h>
29 #include <linux/module.h>
30 #include <linux/mm.h>
31 #include <linux/kthread.h>
32 #include <linux/rbtree.h>
33 #include <linux/sched/signal.h>
34 #include <linux/sched/mm.h>
35 #include <linux/slab.h>
36 #include <linux/uaccess.h>
37 #include <linux/vfio.h>
38 #include <linux/workqueue.h>
39 #include <linux/mdev.h>
40 #include <linux/notifier.h>
41 #include <linux/dma-iommu.h>
42 #include <linux/irqdomain.h>
43
44 #define DRIVER_VERSION "0.2"
45 #define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
46 #define DRIVER_DESC "Type1 IOMMU driver for VFIO"
47
48 static bool allow_unsafe_interrupts;
49 module_param_named(allow_unsafe_interrupts,
50 allow_unsafe_interrupts, bool, S_IRUGO | S_IWUSR);
51 MODULE_PARM_DESC(allow_unsafe_interrupts,
52 "Enable VFIO IOMMU support for on platforms without interrupt remapping support.");
53
54 static bool disable_hugepages;
55 module_param_named(disable_hugepages,
56 disable_hugepages, bool, S_IRUGO | S_IWUSR);
57 MODULE_PARM_DESC(disable_hugepages,
58 "Disable VFIO IOMMU support for IOMMU hugepages.");
59
60 static unsigned int dma_entry_limit __read_mostly = U16_MAX;
61 module_param_named(dma_entry_limit, dma_entry_limit, uint, 0644);
62 MODULE_PARM_DESC(dma_entry_limit,
63 "Maximum number of user DMA mappings per container (65535).");
64
65 struct vfio_iommu {
66 struct list_head domain_list;
67 struct list_head iova_list;
68 struct vfio_domain *external_domain; /* domain for external user */
69 struct mutex lock;
70 struct rb_root dma_list;
71 struct blocking_notifier_head notifier;
72 unsigned int dma_avail;
73 unsigned int vaddr_invalid_count;
74 uint64_t pgsize_bitmap;
75 uint64_t num_non_pinned_groups;
76 wait_queue_head_t vaddr_wait;
77 bool v2;
78 bool nesting;
79 bool dirty_page_tracking;
80 bool container_open;
81 };
82
83 struct vfio_domain {
84 struct iommu_domain *domain;
85 struct list_head next;
86 struct list_head group_list;
87 int prot; /* IOMMU_CACHE */
88 bool fgsp; /* Fine-grained super pages */
89 };
90
91 struct vfio_dma {
92 struct rb_node node;
93 dma_addr_t iova; /* Device address */
94 unsigned long vaddr; /* Process virtual addr */
95 size_t size; /* Map size (bytes) */
96 int prot; /* IOMMU_READ/WRITE */
97 bool iommu_mapped;
98 bool lock_cap; /* capable(CAP_IPC_LOCK) */
99 bool vaddr_invalid;
100 struct task_struct *task;
101 struct rb_root pfn_list; /* Ex-user pinned pfn list */
102 unsigned long *bitmap;
103 };
104
105 struct vfio_batch {
106 struct page **pages; /* for pin_user_pages_remote */
107 struct page *fallback_page; /* if pages alloc fails */
108 int capacity; /* length of pages array */
109 int size; /* of batch currently */
110 int offset; /* of next entry in pages */
111 };
112
113 struct vfio_group {
114 struct iommu_group *iommu_group;
115 struct list_head next;
116 bool mdev_group; /* An mdev group */
117 bool pinned_page_dirty_scope;
118 };
119
120 struct vfio_iova {
121 struct list_head list;
122 dma_addr_t start;
123 dma_addr_t end;
124 };
125
126 /*
127 * Guest RAM pinning working set or DMA target
128 */
129 struct vfio_pfn {
130 struct rb_node node;
131 dma_addr_t iova; /* Device address */
132 unsigned long pfn; /* Host pfn */
133 unsigned int ref_count;
134 };
135
136 struct vfio_regions {
137 struct list_head list;
138 dma_addr_t iova;
139 phys_addr_t phys;
140 size_t len;
141 };
142
143 #define IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu) \
144 (!list_empty(&iommu->domain_list))
145
146 #define DIRTY_BITMAP_BYTES(n) (ALIGN(n, BITS_PER_TYPE(u64)) / BITS_PER_BYTE)
147
148 /*
149 * Input argument of number of bits to bitmap_set() is unsigned integer, which
150 * further casts to signed integer for unaligned multi-bit operation,
151 * __bitmap_set().
152 * Then maximum bitmap size supported is 2^31 bits divided by 2^3 bits/byte,
153 * that is 2^28 (256 MB) which maps to 2^31 * 2^12 = 2^43 (8TB) on 4K page
154 * system.
155 */
156 #define DIRTY_BITMAP_PAGES_MAX ((u64)INT_MAX)
157 #define DIRTY_BITMAP_SIZE_MAX DIRTY_BITMAP_BYTES(DIRTY_BITMAP_PAGES_MAX)
158
159 #define WAITED 1
160
161 static int put_pfn(unsigned long pfn, int prot);
162
163 static struct vfio_group *vfio_iommu_find_iommu_group(struct vfio_iommu *iommu,
164 struct iommu_group *iommu_group);
165
166 /*
167 * This code handles mapping and unmapping of user data buffers
168 * into DMA'ble space using the IOMMU
169 */
170
vfio_find_dma(struct vfio_iommu * iommu,dma_addr_t start,size_t size)171 static struct vfio_dma *vfio_find_dma(struct vfio_iommu *iommu,
172 dma_addr_t start, size_t size)
173 {
174 struct rb_node *node = iommu->dma_list.rb_node;
175
176 while (node) {
177 struct vfio_dma *dma = rb_entry(node, struct vfio_dma, node);
178
179 if (start + size <= dma->iova)
180 node = node->rb_left;
181 else if (start >= dma->iova + dma->size)
182 node = node->rb_right;
183 else
184 return dma;
185 }
186
187 return NULL;
188 }
189
vfio_find_dma_first_node(struct vfio_iommu * iommu,dma_addr_t start,u64 size)190 static struct rb_node *vfio_find_dma_first_node(struct vfio_iommu *iommu,
191 dma_addr_t start, u64 size)
192 {
193 struct rb_node *res = NULL;
194 struct rb_node *node = iommu->dma_list.rb_node;
195 struct vfio_dma *dma_res = NULL;
196
197 while (node) {
198 struct vfio_dma *dma = rb_entry(node, struct vfio_dma, node);
199
200 if (start < dma->iova + dma->size) {
201 res = node;
202 dma_res = dma;
203 if (start >= dma->iova)
204 break;
205 node = node->rb_left;
206 } else {
207 node = node->rb_right;
208 }
209 }
210 if (res && size && dma_res->iova >= start + size)
211 res = NULL;
212 return res;
213 }
214
vfio_link_dma(struct vfio_iommu * iommu,struct vfio_dma * new)215 static void vfio_link_dma(struct vfio_iommu *iommu, struct vfio_dma *new)
216 {
217 struct rb_node **link = &iommu->dma_list.rb_node, *parent = NULL;
218 struct vfio_dma *dma;
219
220 while (*link) {
221 parent = *link;
222 dma = rb_entry(parent, struct vfio_dma, node);
223
224 if (new->iova + new->size <= dma->iova)
225 link = &(*link)->rb_left;
226 else
227 link = &(*link)->rb_right;
228 }
229
230 rb_link_node(&new->node, parent, link);
231 rb_insert_color(&new->node, &iommu->dma_list);
232 }
233
vfio_unlink_dma(struct vfio_iommu * iommu,struct vfio_dma * old)234 static void vfio_unlink_dma(struct vfio_iommu *iommu, struct vfio_dma *old)
235 {
236 rb_erase(&old->node, &iommu->dma_list);
237 }
238
239
vfio_dma_bitmap_alloc(struct vfio_dma * dma,size_t pgsize)240 static int vfio_dma_bitmap_alloc(struct vfio_dma *dma, size_t pgsize)
241 {
242 uint64_t npages = dma->size / pgsize;
243
244 if (npages > DIRTY_BITMAP_PAGES_MAX)
245 return -EINVAL;
246
247 /*
248 * Allocate extra 64 bits that are used to calculate shift required for
249 * bitmap_shift_left() to manipulate and club unaligned number of pages
250 * in adjacent vfio_dma ranges.
251 */
252 dma->bitmap = kvzalloc(DIRTY_BITMAP_BYTES(npages) + sizeof(u64),
253 GFP_KERNEL);
254 if (!dma->bitmap)
255 return -ENOMEM;
256
257 return 0;
258 }
259
vfio_dma_bitmap_free(struct vfio_dma * dma)260 static void vfio_dma_bitmap_free(struct vfio_dma *dma)
261 {
262 kfree(dma->bitmap);
263 dma->bitmap = NULL;
264 }
265
vfio_dma_populate_bitmap(struct vfio_dma * dma,size_t pgsize)266 static void vfio_dma_populate_bitmap(struct vfio_dma *dma, size_t pgsize)
267 {
268 struct rb_node *p;
269 unsigned long pgshift = __ffs(pgsize);
270
271 for (p = rb_first(&dma->pfn_list); p; p = rb_next(p)) {
272 struct vfio_pfn *vpfn = rb_entry(p, struct vfio_pfn, node);
273
274 bitmap_set(dma->bitmap, (vpfn->iova - dma->iova) >> pgshift, 1);
275 }
276 }
277
vfio_iommu_populate_bitmap_full(struct vfio_iommu * iommu)278 static void vfio_iommu_populate_bitmap_full(struct vfio_iommu *iommu)
279 {
280 struct rb_node *n;
281 unsigned long pgshift = __ffs(iommu->pgsize_bitmap);
282
283 for (n = rb_first(&iommu->dma_list); n; n = rb_next(n)) {
284 struct vfio_dma *dma = rb_entry(n, struct vfio_dma, node);
285
286 bitmap_set(dma->bitmap, 0, dma->size >> pgshift);
287 }
288 }
289
vfio_dma_bitmap_alloc_all(struct vfio_iommu * iommu,size_t pgsize)290 static int vfio_dma_bitmap_alloc_all(struct vfio_iommu *iommu, size_t pgsize)
291 {
292 struct rb_node *n;
293
294 for (n = rb_first(&iommu->dma_list); n; n = rb_next(n)) {
295 struct vfio_dma *dma = rb_entry(n, struct vfio_dma, node);
296 int ret;
297
298 ret = vfio_dma_bitmap_alloc(dma, pgsize);
299 if (ret) {
300 struct rb_node *p;
301
302 for (p = rb_prev(n); p; p = rb_prev(p)) {
303 struct vfio_dma *dma = rb_entry(n,
304 struct vfio_dma, node);
305
306 vfio_dma_bitmap_free(dma);
307 }
308 return ret;
309 }
310 vfio_dma_populate_bitmap(dma, pgsize);
311 }
312 return 0;
313 }
314
vfio_dma_bitmap_free_all(struct vfio_iommu * iommu)315 static void vfio_dma_bitmap_free_all(struct vfio_iommu *iommu)
316 {
317 struct rb_node *n;
318
319 for (n = rb_first(&iommu->dma_list); n; n = rb_next(n)) {
320 struct vfio_dma *dma = rb_entry(n, struct vfio_dma, node);
321
322 vfio_dma_bitmap_free(dma);
323 }
324 }
325
326 /*
327 * Helper Functions for host iova-pfn list
328 */
vfio_find_vpfn(struct vfio_dma * dma,dma_addr_t iova)329 static struct vfio_pfn *vfio_find_vpfn(struct vfio_dma *dma, dma_addr_t iova)
330 {
331 struct vfio_pfn *vpfn;
332 struct rb_node *node = dma->pfn_list.rb_node;
333
334 while (node) {
335 vpfn = rb_entry(node, struct vfio_pfn, node);
336
337 if (iova < vpfn->iova)
338 node = node->rb_left;
339 else if (iova > vpfn->iova)
340 node = node->rb_right;
341 else
342 return vpfn;
343 }
344 return NULL;
345 }
346
vfio_link_pfn(struct vfio_dma * dma,struct vfio_pfn * new)347 static void vfio_link_pfn(struct vfio_dma *dma,
348 struct vfio_pfn *new)
349 {
350 struct rb_node **link, *parent = NULL;
351 struct vfio_pfn *vpfn;
352
353 link = &dma->pfn_list.rb_node;
354 while (*link) {
355 parent = *link;
356 vpfn = rb_entry(parent, struct vfio_pfn, node);
357
358 if (new->iova < vpfn->iova)
359 link = &(*link)->rb_left;
360 else
361 link = &(*link)->rb_right;
362 }
363
364 rb_link_node(&new->node, parent, link);
365 rb_insert_color(&new->node, &dma->pfn_list);
366 }
367
vfio_unlink_pfn(struct vfio_dma * dma,struct vfio_pfn * old)368 static void vfio_unlink_pfn(struct vfio_dma *dma, struct vfio_pfn *old)
369 {
370 rb_erase(&old->node, &dma->pfn_list);
371 }
372
vfio_add_to_pfn_list(struct vfio_dma * dma,dma_addr_t iova,unsigned long pfn)373 static int vfio_add_to_pfn_list(struct vfio_dma *dma, dma_addr_t iova,
374 unsigned long pfn)
375 {
376 struct vfio_pfn *vpfn;
377
378 vpfn = kzalloc(sizeof(*vpfn), GFP_KERNEL);
379 if (!vpfn)
380 return -ENOMEM;
381
382 vpfn->iova = iova;
383 vpfn->pfn = pfn;
384 vpfn->ref_count = 1;
385 vfio_link_pfn(dma, vpfn);
386 return 0;
387 }
388
vfio_remove_from_pfn_list(struct vfio_dma * dma,struct vfio_pfn * vpfn)389 static void vfio_remove_from_pfn_list(struct vfio_dma *dma,
390 struct vfio_pfn *vpfn)
391 {
392 vfio_unlink_pfn(dma, vpfn);
393 kfree(vpfn);
394 }
395
vfio_iova_get_vfio_pfn(struct vfio_dma * dma,unsigned long iova)396 static struct vfio_pfn *vfio_iova_get_vfio_pfn(struct vfio_dma *dma,
397 unsigned long iova)
398 {
399 struct vfio_pfn *vpfn = vfio_find_vpfn(dma, iova);
400
401 if (vpfn)
402 vpfn->ref_count++;
403 return vpfn;
404 }
405
vfio_iova_put_vfio_pfn(struct vfio_dma * dma,struct vfio_pfn * vpfn)406 static int vfio_iova_put_vfio_pfn(struct vfio_dma *dma, struct vfio_pfn *vpfn)
407 {
408 int ret = 0;
409
410 vpfn->ref_count--;
411 if (!vpfn->ref_count) {
412 ret = put_pfn(vpfn->pfn, dma->prot);
413 vfio_remove_from_pfn_list(dma, vpfn);
414 }
415 return ret;
416 }
417
vfio_lock_acct(struct vfio_dma * dma,long npage,bool async)418 static int vfio_lock_acct(struct vfio_dma *dma, long npage, bool async)
419 {
420 struct mm_struct *mm;
421 int ret;
422
423 if (!npage)
424 return 0;
425
426 mm = async ? get_task_mm(dma->task) : dma->task->mm;
427 if (!mm)
428 return -ESRCH; /* process exited */
429
430 ret = mmap_write_lock_killable(mm);
431 if (!ret) {
432 ret = __account_locked_vm(mm, abs(npage), npage > 0, dma->task,
433 dma->lock_cap);
434 mmap_write_unlock(mm);
435 }
436
437 if (async)
438 mmput(mm);
439
440 return ret;
441 }
442
443 /*
444 * Some mappings aren't backed by a struct page, for example an mmap'd
445 * MMIO range for our own or another device. These use a different
446 * pfn conversion and shouldn't be tracked as locked pages.
447 * For compound pages, any driver that sets the reserved bit in head
448 * page needs to set the reserved bit in all subpages to be safe.
449 */
is_invalid_reserved_pfn(unsigned long pfn)450 static bool is_invalid_reserved_pfn(unsigned long pfn)
451 {
452 if (pfn_valid(pfn))
453 return PageReserved(pfn_to_page(pfn));
454
455 return true;
456 }
457
put_pfn(unsigned long pfn,int prot)458 static int put_pfn(unsigned long pfn, int prot)
459 {
460 if (!is_invalid_reserved_pfn(pfn)) {
461 struct page *page = pfn_to_page(pfn);
462
463 unpin_user_pages_dirty_lock(&page, 1, prot & IOMMU_WRITE);
464 return 1;
465 }
466 return 0;
467 }
468
469 #define VFIO_BATCH_MAX_CAPACITY (PAGE_SIZE / sizeof(struct page *))
470
vfio_batch_init(struct vfio_batch * batch)471 static void vfio_batch_init(struct vfio_batch *batch)
472 {
473 batch->size = 0;
474 batch->offset = 0;
475
476 if (unlikely(disable_hugepages))
477 goto fallback;
478
479 batch->pages = (struct page **) __get_free_page(GFP_KERNEL);
480 if (!batch->pages)
481 goto fallback;
482
483 batch->capacity = VFIO_BATCH_MAX_CAPACITY;
484 return;
485
486 fallback:
487 batch->pages = &batch->fallback_page;
488 batch->capacity = 1;
489 }
490
vfio_batch_unpin(struct vfio_batch * batch,struct vfio_dma * dma)491 static void vfio_batch_unpin(struct vfio_batch *batch, struct vfio_dma *dma)
492 {
493 while (batch->size) {
494 unsigned long pfn = page_to_pfn(batch->pages[batch->offset]);
495
496 put_pfn(pfn, dma->prot);
497 batch->offset++;
498 batch->size--;
499 }
500 }
501
vfio_batch_fini(struct vfio_batch * batch)502 static void vfio_batch_fini(struct vfio_batch *batch)
503 {
504 if (batch->capacity == VFIO_BATCH_MAX_CAPACITY)
505 free_page((unsigned long)batch->pages);
506 }
507
follow_fault_pfn(struct vm_area_struct * vma,struct mm_struct * mm,unsigned long vaddr,unsigned long * pfn,bool write_fault)508 static int follow_fault_pfn(struct vm_area_struct *vma, struct mm_struct *mm,
509 unsigned long vaddr, unsigned long *pfn,
510 bool write_fault)
511 {
512 pte_t *ptep;
513 spinlock_t *ptl;
514 int ret;
515
516 ret = follow_pte(vma->vm_mm, vaddr, &ptep, &ptl);
517 if (ret) {
518 bool unlocked = false;
519
520 ret = fixup_user_fault(mm, vaddr,
521 FAULT_FLAG_REMOTE |
522 (write_fault ? FAULT_FLAG_WRITE : 0),
523 &unlocked);
524 if (unlocked)
525 return -EAGAIN;
526
527 if (ret)
528 return ret;
529
530 ret = follow_pte(vma->vm_mm, vaddr, &ptep, &ptl);
531 if (ret)
532 return ret;
533 }
534
535 if (write_fault && !pte_write(*ptep))
536 ret = -EFAULT;
537 else
538 *pfn = pte_pfn(*ptep);
539
540 pte_unmap_unlock(ptep, ptl);
541 return ret;
542 }
543
544 /*
545 * Returns the positive number of pfns successfully obtained or a negative
546 * error code.
547 */
vaddr_get_pfns(struct mm_struct * mm,unsigned long vaddr,long npages,int prot,unsigned long * pfn,struct page ** pages)548 static int vaddr_get_pfns(struct mm_struct *mm, unsigned long vaddr,
549 long npages, int prot, unsigned long *pfn,
550 struct page **pages)
551 {
552 struct vm_area_struct *vma;
553 unsigned int flags = 0;
554 int ret;
555
556 if (prot & IOMMU_WRITE)
557 flags |= FOLL_WRITE;
558
559 mmap_read_lock(mm);
560 ret = pin_user_pages_remote(mm, vaddr, npages, flags | FOLL_LONGTERM,
561 pages, NULL, NULL);
562 if (ret > 0) {
563 *pfn = page_to_pfn(pages[0]);
564 goto done;
565 }
566
567 vaddr = untagged_addr(vaddr);
568
569 retry:
570 vma = find_vma_intersection(mm, vaddr, vaddr + 1);
571
572 if (vma && vma->vm_flags & VM_PFNMAP) {
573 ret = follow_fault_pfn(vma, mm, vaddr, pfn, prot & IOMMU_WRITE);
574 if (ret == -EAGAIN)
575 goto retry;
576
577 if (!ret) {
578 if (is_invalid_reserved_pfn(*pfn))
579 ret = 1;
580 else
581 ret = -EFAULT;
582 }
583 }
584 done:
585 mmap_read_unlock(mm);
586 return ret;
587 }
588
vfio_wait(struct vfio_iommu * iommu)589 static int vfio_wait(struct vfio_iommu *iommu)
590 {
591 DEFINE_WAIT(wait);
592
593 prepare_to_wait(&iommu->vaddr_wait, &wait, TASK_KILLABLE);
594 mutex_unlock(&iommu->lock);
595 schedule();
596 mutex_lock(&iommu->lock);
597 finish_wait(&iommu->vaddr_wait, &wait);
598 if (kthread_should_stop() || !iommu->container_open ||
599 fatal_signal_pending(current)) {
600 return -EFAULT;
601 }
602 return WAITED;
603 }
604
605 /*
606 * Find dma struct and wait for its vaddr to be valid. iommu lock is dropped
607 * if the task waits, but is re-locked on return. Return result in *dma_p.
608 * Return 0 on success with no waiting, WAITED on success if waited, and -errno
609 * on error.
610 */
vfio_find_dma_valid(struct vfio_iommu * iommu,dma_addr_t start,size_t size,struct vfio_dma ** dma_p)611 static int vfio_find_dma_valid(struct vfio_iommu *iommu, dma_addr_t start,
612 size_t size, struct vfio_dma **dma_p)
613 {
614 int ret;
615
616 do {
617 *dma_p = vfio_find_dma(iommu, start, size);
618 if (!*dma_p)
619 ret = -EINVAL;
620 else if (!(*dma_p)->vaddr_invalid)
621 ret = 0;
622 else
623 ret = vfio_wait(iommu);
624 } while (ret > 0);
625
626 return ret;
627 }
628
629 /*
630 * Wait for all vaddr in the dma_list to become valid. iommu lock is dropped
631 * if the task waits, but is re-locked on return. Return 0 on success with no
632 * waiting, WAITED on success if waited, and -errno on error.
633 */
vfio_wait_all_valid(struct vfio_iommu * iommu)634 static int vfio_wait_all_valid(struct vfio_iommu *iommu)
635 {
636 int ret = 0;
637
638 while (iommu->vaddr_invalid_count && ret >= 0)
639 ret = vfio_wait(iommu);
640
641 return ret;
642 }
643
644 /*
645 * Attempt to pin pages. We really don't want to track all the pfns and
646 * the iommu can only map chunks of consecutive pfns anyway, so get the
647 * first page and all consecutive pages with the same locking.
648 */
vfio_pin_pages_remote(struct vfio_dma * dma,unsigned long vaddr,long npage,unsigned long * pfn_base,unsigned long limit,struct vfio_batch * batch)649 static long vfio_pin_pages_remote(struct vfio_dma *dma, unsigned long vaddr,
650 long npage, unsigned long *pfn_base,
651 unsigned long limit, struct vfio_batch *batch)
652 {
653 unsigned long pfn;
654 struct mm_struct *mm = current->mm;
655 long ret, pinned = 0, lock_acct = 0;
656 bool rsvd;
657 dma_addr_t iova = vaddr - dma->vaddr + dma->iova;
658
659 /* This code path is only user initiated */
660 if (!mm)
661 return -ENODEV;
662
663 if (batch->size) {
664 /* Leftover pages in batch from an earlier call. */
665 *pfn_base = page_to_pfn(batch->pages[batch->offset]);
666 pfn = *pfn_base;
667 rsvd = is_invalid_reserved_pfn(*pfn_base);
668 } else {
669 *pfn_base = 0;
670 }
671
672 while (npage) {
673 if (!batch->size) {
674 /* Empty batch, so refill it. */
675 long req_pages = min_t(long, npage, batch->capacity);
676
677 ret = vaddr_get_pfns(mm, vaddr, req_pages, dma->prot,
678 &pfn, batch->pages);
679 if (ret < 0)
680 goto unpin_out;
681
682 batch->size = ret;
683 batch->offset = 0;
684
685 if (!*pfn_base) {
686 *pfn_base = pfn;
687 rsvd = is_invalid_reserved_pfn(*pfn_base);
688 }
689 }
690
691 /*
692 * pfn is preset for the first iteration of this inner loop and
693 * updated at the end to handle a VM_PFNMAP pfn. In that case,
694 * batch->pages isn't valid (there's no struct page), so allow
695 * batch->pages to be touched only when there's more than one
696 * pfn to check, which guarantees the pfns are from a
697 * !VM_PFNMAP vma.
698 */
699 while (true) {
700 if (pfn != *pfn_base + pinned ||
701 rsvd != is_invalid_reserved_pfn(pfn))
702 goto out;
703
704 /*
705 * Reserved pages aren't counted against the user,
706 * externally pinned pages are already counted against
707 * the user.
708 */
709 if (!rsvd && !vfio_find_vpfn(dma, iova)) {
710 if (!dma->lock_cap &&
711 mm->locked_vm + lock_acct + 1 > limit) {
712 pr_warn("%s: RLIMIT_MEMLOCK (%ld) exceeded\n",
713 __func__, limit << PAGE_SHIFT);
714 ret = -ENOMEM;
715 goto unpin_out;
716 }
717 lock_acct++;
718 }
719
720 pinned++;
721 npage--;
722 vaddr += PAGE_SIZE;
723 iova += PAGE_SIZE;
724 batch->offset++;
725 batch->size--;
726
727 if (!batch->size)
728 break;
729
730 pfn = page_to_pfn(batch->pages[batch->offset]);
731 }
732
733 if (unlikely(disable_hugepages))
734 break;
735 }
736
737 out:
738 ret = vfio_lock_acct(dma, lock_acct, false);
739
740 unpin_out:
741 if (batch->size == 1 && !batch->offset) {
742 /* May be a VM_PFNMAP pfn, which the batch can't remember. */
743 put_pfn(pfn, dma->prot);
744 batch->size = 0;
745 }
746
747 if (ret < 0) {
748 if (pinned && !rsvd) {
749 for (pfn = *pfn_base ; pinned ; pfn++, pinned--)
750 put_pfn(pfn, dma->prot);
751 }
752 vfio_batch_unpin(batch, dma);
753
754 return ret;
755 }
756
757 return pinned;
758 }
759
vfio_unpin_pages_remote(struct vfio_dma * dma,dma_addr_t iova,unsigned long pfn,long npage,bool do_accounting)760 static long vfio_unpin_pages_remote(struct vfio_dma *dma, dma_addr_t iova,
761 unsigned long pfn, long npage,
762 bool do_accounting)
763 {
764 long unlocked = 0, locked = 0;
765 long i;
766
767 for (i = 0; i < npage; i++, iova += PAGE_SIZE) {
768 if (put_pfn(pfn++, dma->prot)) {
769 unlocked++;
770 if (vfio_find_vpfn(dma, iova))
771 locked++;
772 }
773 }
774
775 if (do_accounting)
776 vfio_lock_acct(dma, locked - unlocked, true);
777
778 return unlocked;
779 }
780
vfio_pin_page_external(struct vfio_dma * dma,unsigned long vaddr,unsigned long * pfn_base,bool do_accounting)781 static int vfio_pin_page_external(struct vfio_dma *dma, unsigned long vaddr,
782 unsigned long *pfn_base, bool do_accounting)
783 {
784 struct page *pages[1];
785 struct mm_struct *mm;
786 int ret;
787
788 mm = get_task_mm(dma->task);
789 if (!mm)
790 return -ENODEV;
791
792 ret = vaddr_get_pfns(mm, vaddr, 1, dma->prot, pfn_base, pages);
793 if (ret != 1)
794 goto out;
795
796 ret = 0;
797
798 if (do_accounting && !is_invalid_reserved_pfn(*pfn_base)) {
799 ret = vfio_lock_acct(dma, 1, true);
800 if (ret) {
801 put_pfn(*pfn_base, dma->prot);
802 if (ret == -ENOMEM)
803 pr_warn("%s: Task %s (%d) RLIMIT_MEMLOCK "
804 "(%ld) exceeded\n", __func__,
805 dma->task->comm, task_pid_nr(dma->task),
806 task_rlimit(dma->task, RLIMIT_MEMLOCK));
807 }
808 }
809
810 out:
811 mmput(mm);
812 return ret;
813 }
814
vfio_unpin_page_external(struct vfio_dma * dma,dma_addr_t iova,bool do_accounting)815 static int vfio_unpin_page_external(struct vfio_dma *dma, dma_addr_t iova,
816 bool do_accounting)
817 {
818 int unlocked;
819 struct vfio_pfn *vpfn = vfio_find_vpfn(dma, iova);
820
821 if (!vpfn)
822 return 0;
823
824 unlocked = vfio_iova_put_vfio_pfn(dma, vpfn);
825
826 if (do_accounting)
827 vfio_lock_acct(dma, -unlocked, true);
828
829 return unlocked;
830 }
831
vfio_iommu_type1_pin_pages(void * iommu_data,struct iommu_group * iommu_group,unsigned long * user_pfn,int npage,int prot,unsigned long * phys_pfn)832 static int vfio_iommu_type1_pin_pages(void *iommu_data,
833 struct iommu_group *iommu_group,
834 unsigned long *user_pfn,
835 int npage, int prot,
836 unsigned long *phys_pfn)
837 {
838 struct vfio_iommu *iommu = iommu_data;
839 struct vfio_group *group;
840 int i, j, ret;
841 unsigned long remote_vaddr;
842 struct vfio_dma *dma;
843 bool do_accounting;
844 dma_addr_t iova;
845
846 if (!iommu || !user_pfn || !phys_pfn)
847 return -EINVAL;
848
849 /* Supported for v2 version only */
850 if (!iommu->v2)
851 return -EACCES;
852
853 mutex_lock(&iommu->lock);
854
855 /*
856 * Wait for all necessary vaddr's to be valid so they can be used in
857 * the main loop without dropping the lock, to avoid racing vs unmap.
858 */
859 again:
860 if (iommu->vaddr_invalid_count) {
861 for (i = 0; i < npage; i++) {
862 iova = user_pfn[i] << PAGE_SHIFT;
863 ret = vfio_find_dma_valid(iommu, iova, PAGE_SIZE, &dma);
864 if (ret < 0)
865 goto pin_done;
866 if (ret == WAITED)
867 goto again;
868 }
869 }
870
871 /* Fail if notifier list is empty */
872 if (!iommu->notifier.head) {
873 ret = -EINVAL;
874 goto pin_done;
875 }
876
877 /*
878 * If iommu capable domain exist in the container then all pages are
879 * already pinned and accounted. Accounting should be done if there is no
880 * iommu capable domain in the container.
881 */
882 do_accounting = !IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu);
883
884 for (i = 0; i < npage; i++) {
885 struct vfio_pfn *vpfn;
886
887 iova = user_pfn[i] << PAGE_SHIFT;
888 dma = vfio_find_dma(iommu, iova, PAGE_SIZE);
889 if (!dma) {
890 ret = -EINVAL;
891 goto pin_unwind;
892 }
893
894 if ((dma->prot & prot) != prot) {
895 ret = -EPERM;
896 goto pin_unwind;
897 }
898
899 vpfn = vfio_iova_get_vfio_pfn(dma, iova);
900 if (vpfn) {
901 phys_pfn[i] = vpfn->pfn;
902 continue;
903 }
904
905 remote_vaddr = dma->vaddr + (iova - dma->iova);
906 ret = vfio_pin_page_external(dma, remote_vaddr, &phys_pfn[i],
907 do_accounting);
908 if (ret)
909 goto pin_unwind;
910
911 ret = vfio_add_to_pfn_list(dma, iova, phys_pfn[i]);
912 if (ret) {
913 if (put_pfn(phys_pfn[i], dma->prot) && do_accounting)
914 vfio_lock_acct(dma, -1, true);
915 goto pin_unwind;
916 }
917
918 if (iommu->dirty_page_tracking) {
919 unsigned long pgshift = __ffs(iommu->pgsize_bitmap);
920
921 /*
922 * Bitmap populated with the smallest supported page
923 * size
924 */
925 bitmap_set(dma->bitmap,
926 (iova - dma->iova) >> pgshift, 1);
927 }
928 }
929 ret = i;
930
931 group = vfio_iommu_find_iommu_group(iommu, iommu_group);
932 if (!group->pinned_page_dirty_scope) {
933 group->pinned_page_dirty_scope = true;
934 iommu->num_non_pinned_groups--;
935 }
936
937 goto pin_done;
938
939 pin_unwind:
940 phys_pfn[i] = 0;
941 for (j = 0; j < i; j++) {
942 dma_addr_t iova;
943
944 iova = user_pfn[j] << PAGE_SHIFT;
945 dma = vfio_find_dma(iommu, iova, PAGE_SIZE);
946 vfio_unpin_page_external(dma, iova, do_accounting);
947 phys_pfn[j] = 0;
948 }
949 pin_done:
950 mutex_unlock(&iommu->lock);
951 return ret;
952 }
953
vfio_iommu_type1_unpin_pages(void * iommu_data,unsigned long * user_pfn,int npage)954 static int vfio_iommu_type1_unpin_pages(void *iommu_data,
955 unsigned long *user_pfn,
956 int npage)
957 {
958 struct vfio_iommu *iommu = iommu_data;
959 bool do_accounting;
960 int i;
961
962 if (!iommu || !user_pfn || npage <= 0)
963 return -EINVAL;
964
965 /* Supported for v2 version only */
966 if (!iommu->v2)
967 return -EACCES;
968
969 mutex_lock(&iommu->lock);
970
971 do_accounting = !IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu);
972 for (i = 0; i < npage; i++) {
973 struct vfio_dma *dma;
974 dma_addr_t iova;
975
976 iova = user_pfn[i] << PAGE_SHIFT;
977 dma = vfio_find_dma(iommu, iova, PAGE_SIZE);
978 if (!dma)
979 break;
980
981 vfio_unpin_page_external(dma, iova, do_accounting);
982 }
983
984 mutex_unlock(&iommu->lock);
985 return i > 0 ? i : -EINVAL;
986 }
987
vfio_sync_unpin(struct vfio_dma * dma,struct vfio_domain * domain,struct list_head * regions,struct iommu_iotlb_gather * iotlb_gather)988 static long vfio_sync_unpin(struct vfio_dma *dma, struct vfio_domain *domain,
989 struct list_head *regions,
990 struct iommu_iotlb_gather *iotlb_gather)
991 {
992 long unlocked = 0;
993 struct vfio_regions *entry, *next;
994
995 iommu_iotlb_sync(domain->domain, iotlb_gather);
996
997 list_for_each_entry_safe(entry, next, regions, list) {
998 unlocked += vfio_unpin_pages_remote(dma,
999 entry->iova,
1000 entry->phys >> PAGE_SHIFT,
1001 entry->len >> PAGE_SHIFT,
1002 false);
1003 list_del(&entry->list);
1004 kfree(entry);
1005 }
1006
1007 cond_resched();
1008
1009 return unlocked;
1010 }
1011
1012 /*
1013 * Generally, VFIO needs to unpin remote pages after each IOTLB flush.
1014 * Therefore, when using IOTLB flush sync interface, VFIO need to keep track
1015 * of these regions (currently using a list).
1016 *
1017 * This value specifies maximum number of regions for each IOTLB flush sync.
1018 */
1019 #define VFIO_IOMMU_TLB_SYNC_MAX 512
1020
unmap_unpin_fast(struct vfio_domain * domain,struct vfio_dma * dma,dma_addr_t * iova,size_t len,phys_addr_t phys,long * unlocked,struct list_head * unmapped_list,int * unmapped_cnt,struct iommu_iotlb_gather * iotlb_gather)1021 static size_t unmap_unpin_fast(struct vfio_domain *domain,
1022 struct vfio_dma *dma, dma_addr_t *iova,
1023 size_t len, phys_addr_t phys, long *unlocked,
1024 struct list_head *unmapped_list,
1025 int *unmapped_cnt,
1026 struct iommu_iotlb_gather *iotlb_gather)
1027 {
1028 size_t unmapped = 0;
1029 struct vfio_regions *entry = kzalloc(sizeof(*entry), GFP_KERNEL);
1030
1031 if (entry) {
1032 unmapped = iommu_unmap_fast(domain->domain, *iova, len,
1033 iotlb_gather);
1034
1035 if (!unmapped) {
1036 kfree(entry);
1037 } else {
1038 entry->iova = *iova;
1039 entry->phys = phys;
1040 entry->len = unmapped;
1041 list_add_tail(&entry->list, unmapped_list);
1042
1043 *iova += unmapped;
1044 (*unmapped_cnt)++;
1045 }
1046 }
1047
1048 /*
1049 * Sync if the number of fast-unmap regions hits the limit
1050 * or in case of errors.
1051 */
1052 if (*unmapped_cnt >= VFIO_IOMMU_TLB_SYNC_MAX || !unmapped) {
1053 *unlocked += vfio_sync_unpin(dma, domain, unmapped_list,
1054 iotlb_gather);
1055 *unmapped_cnt = 0;
1056 }
1057
1058 return unmapped;
1059 }
1060
unmap_unpin_slow(struct vfio_domain * domain,struct vfio_dma * dma,dma_addr_t * iova,size_t len,phys_addr_t phys,long * unlocked)1061 static size_t unmap_unpin_slow(struct vfio_domain *domain,
1062 struct vfio_dma *dma, dma_addr_t *iova,
1063 size_t len, phys_addr_t phys,
1064 long *unlocked)
1065 {
1066 size_t unmapped = iommu_unmap(domain->domain, *iova, len);
1067
1068 if (unmapped) {
1069 *unlocked += vfio_unpin_pages_remote(dma, *iova,
1070 phys >> PAGE_SHIFT,
1071 unmapped >> PAGE_SHIFT,
1072 false);
1073 *iova += unmapped;
1074 cond_resched();
1075 }
1076 return unmapped;
1077 }
1078
vfio_unmap_unpin(struct vfio_iommu * iommu,struct vfio_dma * dma,bool do_accounting)1079 static long vfio_unmap_unpin(struct vfio_iommu *iommu, struct vfio_dma *dma,
1080 bool do_accounting)
1081 {
1082 dma_addr_t iova = dma->iova, end = dma->iova + dma->size;
1083 struct vfio_domain *domain, *d;
1084 LIST_HEAD(unmapped_region_list);
1085 struct iommu_iotlb_gather iotlb_gather;
1086 int unmapped_region_cnt = 0;
1087 long unlocked = 0;
1088
1089 if (!dma->size)
1090 return 0;
1091
1092 if (!IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu))
1093 return 0;
1094
1095 /*
1096 * We use the IOMMU to track the physical addresses, otherwise we'd
1097 * need a much more complicated tracking system. Unfortunately that
1098 * means we need to use one of the iommu domains to figure out the
1099 * pfns to unpin. The rest need to be unmapped in advance so we have
1100 * no iommu translations remaining when the pages are unpinned.
1101 */
1102 domain = d = list_first_entry(&iommu->domain_list,
1103 struct vfio_domain, next);
1104
1105 list_for_each_entry_continue(d, &iommu->domain_list, next) {
1106 iommu_unmap(d->domain, dma->iova, dma->size);
1107 cond_resched();
1108 }
1109
1110 iommu_iotlb_gather_init(&iotlb_gather);
1111 while (iova < end) {
1112 size_t unmapped, len;
1113 phys_addr_t phys, next;
1114
1115 phys = iommu_iova_to_phys(domain->domain, iova);
1116 if (WARN_ON(!phys)) {
1117 iova += PAGE_SIZE;
1118 continue;
1119 }
1120
1121 /*
1122 * To optimize for fewer iommu_unmap() calls, each of which
1123 * may require hardware cache flushing, try to find the
1124 * largest contiguous physical memory chunk to unmap.
1125 */
1126 for (len = PAGE_SIZE;
1127 !domain->fgsp && iova + len < end; len += PAGE_SIZE) {
1128 next = iommu_iova_to_phys(domain->domain, iova + len);
1129 if (next != phys + len)
1130 break;
1131 }
1132
1133 /*
1134 * First, try to use fast unmap/unpin. In case of failure,
1135 * switch to slow unmap/unpin path.
1136 */
1137 unmapped = unmap_unpin_fast(domain, dma, &iova, len, phys,
1138 &unlocked, &unmapped_region_list,
1139 &unmapped_region_cnt,
1140 &iotlb_gather);
1141 if (!unmapped) {
1142 unmapped = unmap_unpin_slow(domain, dma, &iova, len,
1143 phys, &unlocked);
1144 if (WARN_ON(!unmapped))
1145 break;
1146 }
1147 }
1148
1149 dma->iommu_mapped = false;
1150
1151 if (unmapped_region_cnt) {
1152 unlocked += vfio_sync_unpin(dma, domain, &unmapped_region_list,
1153 &iotlb_gather);
1154 }
1155
1156 if (do_accounting) {
1157 vfio_lock_acct(dma, -unlocked, true);
1158 return 0;
1159 }
1160 return unlocked;
1161 }
1162
vfio_remove_dma(struct vfio_iommu * iommu,struct vfio_dma * dma)1163 static void vfio_remove_dma(struct vfio_iommu *iommu, struct vfio_dma *dma)
1164 {
1165 WARN_ON(!RB_EMPTY_ROOT(&dma->pfn_list));
1166 vfio_unmap_unpin(iommu, dma, true);
1167 vfio_unlink_dma(iommu, dma);
1168 put_task_struct(dma->task);
1169 vfio_dma_bitmap_free(dma);
1170 if (dma->vaddr_invalid) {
1171 iommu->vaddr_invalid_count--;
1172 wake_up_all(&iommu->vaddr_wait);
1173 }
1174 kfree(dma);
1175 iommu->dma_avail++;
1176 }
1177
vfio_update_pgsize_bitmap(struct vfio_iommu * iommu)1178 static void vfio_update_pgsize_bitmap(struct vfio_iommu *iommu)
1179 {
1180 struct vfio_domain *domain;
1181
1182 iommu->pgsize_bitmap = ULONG_MAX;
1183
1184 list_for_each_entry(domain, &iommu->domain_list, next)
1185 iommu->pgsize_bitmap &= domain->domain->pgsize_bitmap;
1186
1187 /*
1188 * In case the IOMMU supports page sizes smaller than PAGE_SIZE
1189 * we pretend PAGE_SIZE is supported and hide sub-PAGE_SIZE sizes.
1190 * That way the user will be able to map/unmap buffers whose size/
1191 * start address is aligned with PAGE_SIZE. Pinning code uses that
1192 * granularity while iommu driver can use the sub-PAGE_SIZE size
1193 * to map the buffer.
1194 */
1195 if (iommu->pgsize_bitmap & ~PAGE_MASK) {
1196 iommu->pgsize_bitmap &= PAGE_MASK;
1197 iommu->pgsize_bitmap |= PAGE_SIZE;
1198 }
1199 }
1200
update_user_bitmap(u64 __user * bitmap,struct vfio_iommu * iommu,struct vfio_dma * dma,dma_addr_t base_iova,size_t pgsize)1201 static int update_user_bitmap(u64 __user *bitmap, struct vfio_iommu *iommu,
1202 struct vfio_dma *dma, dma_addr_t base_iova,
1203 size_t pgsize)
1204 {
1205 unsigned long pgshift = __ffs(pgsize);
1206 unsigned long nbits = dma->size >> pgshift;
1207 unsigned long bit_offset = (dma->iova - base_iova) >> pgshift;
1208 unsigned long copy_offset = bit_offset / BITS_PER_LONG;
1209 unsigned long shift = bit_offset % BITS_PER_LONG;
1210 unsigned long leftover;
1211
1212 /*
1213 * mark all pages dirty if any IOMMU capable device is not able
1214 * to report dirty pages and all pages are pinned and mapped.
1215 */
1216 if (iommu->num_non_pinned_groups && dma->iommu_mapped)
1217 bitmap_set(dma->bitmap, 0, nbits);
1218
1219 if (shift) {
1220 bitmap_shift_left(dma->bitmap, dma->bitmap, shift,
1221 nbits + shift);
1222
1223 if (copy_from_user(&leftover,
1224 (void __user *)(bitmap + copy_offset),
1225 sizeof(leftover)))
1226 return -EFAULT;
1227
1228 bitmap_or(dma->bitmap, dma->bitmap, &leftover, shift);
1229 }
1230
1231 if (copy_to_user((void __user *)(bitmap + copy_offset), dma->bitmap,
1232 DIRTY_BITMAP_BYTES(nbits + shift)))
1233 return -EFAULT;
1234
1235 return 0;
1236 }
1237
vfio_iova_dirty_bitmap(u64 __user * bitmap,struct vfio_iommu * iommu,dma_addr_t iova,size_t size,size_t pgsize)1238 static int vfio_iova_dirty_bitmap(u64 __user *bitmap, struct vfio_iommu *iommu,
1239 dma_addr_t iova, size_t size, size_t pgsize)
1240 {
1241 struct vfio_dma *dma;
1242 struct rb_node *n;
1243 unsigned long pgshift = __ffs(pgsize);
1244 int ret;
1245
1246 /*
1247 * GET_BITMAP request must fully cover vfio_dma mappings. Multiple
1248 * vfio_dma mappings may be clubbed by specifying large ranges, but
1249 * there must not be any previous mappings bisected by the range.
1250 * An error will be returned if these conditions are not met.
1251 */
1252 dma = vfio_find_dma(iommu, iova, 1);
1253 if (dma && dma->iova != iova)
1254 return -EINVAL;
1255
1256 dma = vfio_find_dma(iommu, iova + size - 1, 0);
1257 if (dma && dma->iova + dma->size != iova + size)
1258 return -EINVAL;
1259
1260 for (n = rb_first(&iommu->dma_list); n; n = rb_next(n)) {
1261 struct vfio_dma *dma = rb_entry(n, struct vfio_dma, node);
1262
1263 if (dma->iova < iova)
1264 continue;
1265
1266 if (dma->iova > iova + size - 1)
1267 break;
1268
1269 ret = update_user_bitmap(bitmap, iommu, dma, iova, pgsize);
1270 if (ret)
1271 return ret;
1272
1273 /*
1274 * Re-populate bitmap to include all pinned pages which are
1275 * considered as dirty but exclude pages which are unpinned and
1276 * pages which are marked dirty by vfio_dma_rw()
1277 */
1278 bitmap_clear(dma->bitmap, 0, dma->size >> pgshift);
1279 vfio_dma_populate_bitmap(dma, pgsize);
1280 }
1281 return 0;
1282 }
1283
verify_bitmap_size(uint64_t npages,uint64_t bitmap_size)1284 static int verify_bitmap_size(uint64_t npages, uint64_t bitmap_size)
1285 {
1286 if (!npages || !bitmap_size || (bitmap_size > DIRTY_BITMAP_SIZE_MAX) ||
1287 (bitmap_size < DIRTY_BITMAP_BYTES(npages)))
1288 return -EINVAL;
1289
1290 return 0;
1291 }
1292
vfio_dma_do_unmap(struct vfio_iommu * iommu,struct vfio_iommu_type1_dma_unmap * unmap,struct vfio_bitmap * bitmap)1293 static int vfio_dma_do_unmap(struct vfio_iommu *iommu,
1294 struct vfio_iommu_type1_dma_unmap *unmap,
1295 struct vfio_bitmap *bitmap)
1296 {
1297 struct vfio_dma *dma, *dma_last = NULL;
1298 size_t unmapped = 0, pgsize;
1299 int ret = -EINVAL, retries = 0;
1300 unsigned long pgshift;
1301 dma_addr_t iova = unmap->iova;
1302 u64 size = unmap->size;
1303 bool unmap_all = unmap->flags & VFIO_DMA_UNMAP_FLAG_ALL;
1304 bool invalidate_vaddr = unmap->flags & VFIO_DMA_UNMAP_FLAG_VADDR;
1305 struct rb_node *n, *first_n;
1306
1307 mutex_lock(&iommu->lock);
1308
1309 pgshift = __ffs(iommu->pgsize_bitmap);
1310 pgsize = (size_t)1 << pgshift;
1311
1312 if (iova & (pgsize - 1))
1313 goto unlock;
1314
1315 if (unmap_all) {
1316 if (iova || size)
1317 goto unlock;
1318 size = U64_MAX;
1319 } else if (!size || size & (pgsize - 1) ||
1320 iova + size - 1 < iova || size > SIZE_MAX) {
1321 goto unlock;
1322 }
1323
1324 /* When dirty tracking is enabled, allow only min supported pgsize */
1325 if ((unmap->flags & VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP) &&
1326 (!iommu->dirty_page_tracking || (bitmap->pgsize != pgsize))) {
1327 goto unlock;
1328 }
1329
1330 WARN_ON((pgsize - 1) & PAGE_MASK);
1331 again:
1332 /*
1333 * vfio-iommu-type1 (v1) - User mappings were coalesced together to
1334 * avoid tracking individual mappings. This means that the granularity
1335 * of the original mapping was lost and the user was allowed to attempt
1336 * to unmap any range. Depending on the contiguousness of physical
1337 * memory and page sizes supported by the IOMMU, arbitrary unmaps may
1338 * or may not have worked. We only guaranteed unmap granularity
1339 * matching the original mapping; even though it was untracked here,
1340 * the original mappings are reflected in IOMMU mappings. This
1341 * resulted in a couple unusual behaviors. First, if a range is not
1342 * able to be unmapped, ex. a set of 4k pages that was mapped as a
1343 * 2M hugepage into the IOMMU, the unmap ioctl returns success but with
1344 * a zero sized unmap. Also, if an unmap request overlaps the first
1345 * address of a hugepage, the IOMMU will unmap the entire hugepage.
1346 * This also returns success and the returned unmap size reflects the
1347 * actual size unmapped.
1348 *
1349 * We attempt to maintain compatibility with this "v1" interface, but
1350 * we take control out of the hands of the IOMMU. Therefore, an unmap
1351 * request offset from the beginning of the original mapping will
1352 * return success with zero sized unmap. And an unmap request covering
1353 * the first iova of mapping will unmap the entire range.
1354 *
1355 * The v2 version of this interface intends to be more deterministic.
1356 * Unmap requests must fully cover previous mappings. Multiple
1357 * mappings may still be unmaped by specifying large ranges, but there
1358 * must not be any previous mappings bisected by the range. An error
1359 * will be returned if these conditions are not met. The v2 interface
1360 * will only return success and a size of zero if there were no
1361 * mappings within the range.
1362 */
1363 if (iommu->v2 && !unmap_all) {
1364 dma = vfio_find_dma(iommu, iova, 1);
1365 if (dma && dma->iova != iova)
1366 goto unlock;
1367
1368 dma = vfio_find_dma(iommu, iova + size - 1, 0);
1369 if (dma && dma->iova + dma->size != iova + size)
1370 goto unlock;
1371 }
1372
1373 ret = 0;
1374 n = first_n = vfio_find_dma_first_node(iommu, iova, size);
1375
1376 while (n) {
1377 dma = rb_entry(n, struct vfio_dma, node);
1378 if (dma->iova >= iova + size)
1379 break;
1380
1381 if (!iommu->v2 && iova > dma->iova)
1382 break;
1383 /*
1384 * Task with same address space who mapped this iova range is
1385 * allowed to unmap the iova range.
1386 */
1387 if (dma->task->mm != current->mm)
1388 break;
1389
1390 if (invalidate_vaddr) {
1391 if (dma->vaddr_invalid) {
1392 struct rb_node *last_n = n;
1393
1394 for (n = first_n; n != last_n; n = rb_next(n)) {
1395 dma = rb_entry(n,
1396 struct vfio_dma, node);
1397 dma->vaddr_invalid = false;
1398 iommu->vaddr_invalid_count--;
1399 }
1400 ret = -EINVAL;
1401 unmapped = 0;
1402 break;
1403 }
1404 dma->vaddr_invalid = true;
1405 iommu->vaddr_invalid_count++;
1406 unmapped += dma->size;
1407 n = rb_next(n);
1408 continue;
1409 }
1410
1411 if (!RB_EMPTY_ROOT(&dma->pfn_list)) {
1412 struct vfio_iommu_type1_dma_unmap nb_unmap;
1413
1414 if (dma_last == dma) {
1415 BUG_ON(++retries > 10);
1416 } else {
1417 dma_last = dma;
1418 retries = 0;
1419 }
1420
1421 nb_unmap.iova = dma->iova;
1422 nb_unmap.size = dma->size;
1423
1424 /*
1425 * Notify anyone (mdev vendor drivers) to invalidate and
1426 * unmap iovas within the range we're about to unmap.
1427 * Vendor drivers MUST unpin pages in response to an
1428 * invalidation.
1429 */
1430 mutex_unlock(&iommu->lock);
1431 blocking_notifier_call_chain(&iommu->notifier,
1432 VFIO_IOMMU_NOTIFY_DMA_UNMAP,
1433 &nb_unmap);
1434 mutex_lock(&iommu->lock);
1435 goto again;
1436 }
1437
1438 if (unmap->flags & VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP) {
1439 ret = update_user_bitmap(bitmap->data, iommu, dma,
1440 iova, pgsize);
1441 if (ret)
1442 break;
1443 }
1444
1445 unmapped += dma->size;
1446 n = rb_next(n);
1447 vfio_remove_dma(iommu, dma);
1448 }
1449
1450 unlock:
1451 mutex_unlock(&iommu->lock);
1452
1453 /* Report how much was unmapped */
1454 unmap->size = unmapped;
1455
1456 return ret;
1457 }
1458
vfio_iommu_map(struct vfio_iommu * iommu,dma_addr_t iova,unsigned long pfn,long npage,int prot)1459 static int vfio_iommu_map(struct vfio_iommu *iommu, dma_addr_t iova,
1460 unsigned long pfn, long npage, int prot)
1461 {
1462 struct vfio_domain *d;
1463 int ret;
1464
1465 list_for_each_entry(d, &iommu->domain_list, next) {
1466 ret = iommu_map(d->domain, iova, (phys_addr_t)pfn << PAGE_SHIFT,
1467 npage << PAGE_SHIFT, prot | d->prot);
1468 if (ret)
1469 goto unwind;
1470
1471 cond_resched();
1472 }
1473
1474 return 0;
1475
1476 unwind:
1477 list_for_each_entry_continue_reverse(d, &iommu->domain_list, next) {
1478 iommu_unmap(d->domain, iova, npage << PAGE_SHIFT);
1479 cond_resched();
1480 }
1481
1482 return ret;
1483 }
1484
vfio_pin_map_dma(struct vfio_iommu * iommu,struct vfio_dma * dma,size_t map_size)1485 static int vfio_pin_map_dma(struct vfio_iommu *iommu, struct vfio_dma *dma,
1486 size_t map_size)
1487 {
1488 dma_addr_t iova = dma->iova;
1489 unsigned long vaddr = dma->vaddr;
1490 struct vfio_batch batch;
1491 size_t size = map_size;
1492 long npage;
1493 unsigned long pfn, limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
1494 int ret = 0;
1495
1496 vfio_batch_init(&batch);
1497
1498 while (size) {
1499 /* Pin a contiguous chunk of memory */
1500 npage = vfio_pin_pages_remote(dma, vaddr + dma->size,
1501 size >> PAGE_SHIFT, &pfn, limit,
1502 &batch);
1503 if (npage <= 0) {
1504 WARN_ON(!npage);
1505 ret = (int)npage;
1506 break;
1507 }
1508
1509 /* Map it! */
1510 ret = vfio_iommu_map(iommu, iova + dma->size, pfn, npage,
1511 dma->prot);
1512 if (ret) {
1513 vfio_unpin_pages_remote(dma, iova + dma->size, pfn,
1514 npage, true);
1515 vfio_batch_unpin(&batch, dma);
1516 break;
1517 }
1518
1519 size -= npage << PAGE_SHIFT;
1520 dma->size += npage << PAGE_SHIFT;
1521 }
1522
1523 vfio_batch_fini(&batch);
1524 dma->iommu_mapped = true;
1525
1526 if (ret)
1527 vfio_remove_dma(iommu, dma);
1528
1529 return ret;
1530 }
1531
1532 /*
1533 * Check dma map request is within a valid iova range
1534 */
vfio_iommu_iova_dma_valid(struct vfio_iommu * iommu,dma_addr_t start,dma_addr_t end)1535 static bool vfio_iommu_iova_dma_valid(struct vfio_iommu *iommu,
1536 dma_addr_t start, dma_addr_t end)
1537 {
1538 struct list_head *iova = &iommu->iova_list;
1539 struct vfio_iova *node;
1540
1541 list_for_each_entry(node, iova, list) {
1542 if (start >= node->start && end <= node->end)
1543 return true;
1544 }
1545
1546 /*
1547 * Check for list_empty() as well since a container with
1548 * a single mdev device will have an empty list.
1549 */
1550 return list_empty(iova);
1551 }
1552
vfio_dma_do_map(struct vfio_iommu * iommu,struct vfio_iommu_type1_dma_map * map)1553 static int vfio_dma_do_map(struct vfio_iommu *iommu,
1554 struct vfio_iommu_type1_dma_map *map)
1555 {
1556 bool set_vaddr = map->flags & VFIO_DMA_MAP_FLAG_VADDR;
1557 dma_addr_t iova = map->iova;
1558 unsigned long vaddr = map->vaddr;
1559 size_t size = map->size;
1560 int ret = 0, prot = 0;
1561 size_t pgsize;
1562 struct vfio_dma *dma;
1563
1564 /* Verify that none of our __u64 fields overflow */
1565 if (map->size != size || map->vaddr != vaddr || map->iova != iova)
1566 return -EINVAL;
1567
1568 /* READ/WRITE from device perspective */
1569 if (map->flags & VFIO_DMA_MAP_FLAG_WRITE)
1570 prot |= IOMMU_WRITE;
1571 if (map->flags & VFIO_DMA_MAP_FLAG_READ)
1572 prot |= IOMMU_READ;
1573
1574 if ((prot && set_vaddr) || (!prot && !set_vaddr))
1575 return -EINVAL;
1576
1577 mutex_lock(&iommu->lock);
1578
1579 pgsize = (size_t)1 << __ffs(iommu->pgsize_bitmap);
1580
1581 WARN_ON((pgsize - 1) & PAGE_MASK);
1582
1583 if (!size || (size | iova | vaddr) & (pgsize - 1)) {
1584 ret = -EINVAL;
1585 goto out_unlock;
1586 }
1587
1588 /* Don't allow IOVA or virtual address wrap */
1589 if (iova + size - 1 < iova || vaddr + size - 1 < vaddr) {
1590 ret = -EINVAL;
1591 goto out_unlock;
1592 }
1593
1594 dma = vfio_find_dma(iommu, iova, size);
1595 if (set_vaddr) {
1596 if (!dma) {
1597 ret = -ENOENT;
1598 } else if (!dma->vaddr_invalid || dma->iova != iova ||
1599 dma->size != size) {
1600 ret = -EINVAL;
1601 } else {
1602 dma->vaddr = vaddr;
1603 dma->vaddr_invalid = false;
1604 iommu->vaddr_invalid_count--;
1605 wake_up_all(&iommu->vaddr_wait);
1606 }
1607 goto out_unlock;
1608 } else if (dma) {
1609 ret = -EEXIST;
1610 goto out_unlock;
1611 }
1612
1613 if (!iommu->dma_avail) {
1614 ret = -ENOSPC;
1615 goto out_unlock;
1616 }
1617
1618 if (!vfio_iommu_iova_dma_valid(iommu, iova, iova + size - 1)) {
1619 ret = -EINVAL;
1620 goto out_unlock;
1621 }
1622
1623 dma = kzalloc(sizeof(*dma), GFP_KERNEL);
1624 if (!dma) {
1625 ret = -ENOMEM;
1626 goto out_unlock;
1627 }
1628
1629 iommu->dma_avail--;
1630 dma->iova = iova;
1631 dma->vaddr = vaddr;
1632 dma->prot = prot;
1633
1634 /*
1635 * We need to be able to both add to a task's locked memory and test
1636 * against the locked memory limit and we need to be able to do both
1637 * outside of this call path as pinning can be asynchronous via the
1638 * external interfaces for mdev devices. RLIMIT_MEMLOCK requires a
1639 * task_struct and VM locked pages requires an mm_struct, however
1640 * holding an indefinite mm reference is not recommended, therefore we
1641 * only hold a reference to a task. We could hold a reference to
1642 * current, however QEMU uses this call path through vCPU threads,
1643 * which can be killed resulting in a NULL mm and failure in the unmap
1644 * path when called via a different thread. Avoid this problem by
1645 * using the group_leader as threads within the same group require
1646 * both CLONE_THREAD and CLONE_VM and will therefore use the same
1647 * mm_struct.
1648 *
1649 * Previously we also used the task for testing CAP_IPC_LOCK at the
1650 * time of pinning and accounting, however has_capability() makes use
1651 * of real_cred, a copy-on-write field, so we can't guarantee that it
1652 * matches group_leader, or in fact that it might not change by the
1653 * time it's evaluated. If a process were to call MAP_DMA with
1654 * CAP_IPC_LOCK but later drop it, it doesn't make sense that they
1655 * possibly see different results for an iommu_mapped vfio_dma vs
1656 * externally mapped. Therefore track CAP_IPC_LOCK in vfio_dma at the
1657 * time of calling MAP_DMA.
1658 */
1659 get_task_struct(current->group_leader);
1660 dma->task = current->group_leader;
1661 dma->lock_cap = capable(CAP_IPC_LOCK);
1662
1663 dma->pfn_list = RB_ROOT;
1664
1665 /* Insert zero-sized and grow as we map chunks of it */
1666 vfio_link_dma(iommu, dma);
1667
1668 /* Don't pin and map if container doesn't contain IOMMU capable domain*/
1669 if (!IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu))
1670 dma->size = size;
1671 else
1672 ret = vfio_pin_map_dma(iommu, dma, size);
1673
1674 if (!ret && iommu->dirty_page_tracking) {
1675 ret = vfio_dma_bitmap_alloc(dma, pgsize);
1676 if (ret)
1677 vfio_remove_dma(iommu, dma);
1678 }
1679
1680 out_unlock:
1681 mutex_unlock(&iommu->lock);
1682 return ret;
1683 }
1684
vfio_bus_type(struct device * dev,void * data)1685 static int vfio_bus_type(struct device *dev, void *data)
1686 {
1687 struct bus_type **bus = data;
1688
1689 if (*bus && *bus != dev->bus)
1690 return -EINVAL;
1691
1692 *bus = dev->bus;
1693
1694 return 0;
1695 }
1696
vfio_iommu_replay(struct vfio_iommu * iommu,struct vfio_domain * domain)1697 static int vfio_iommu_replay(struct vfio_iommu *iommu,
1698 struct vfio_domain *domain)
1699 {
1700 struct vfio_batch batch;
1701 struct vfio_domain *d = NULL;
1702 struct rb_node *n;
1703 unsigned long limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
1704 int ret;
1705
1706 ret = vfio_wait_all_valid(iommu);
1707 if (ret < 0)
1708 return ret;
1709
1710 /* Arbitrarily pick the first domain in the list for lookups */
1711 if (!list_empty(&iommu->domain_list))
1712 d = list_first_entry(&iommu->domain_list,
1713 struct vfio_domain, next);
1714
1715 vfio_batch_init(&batch);
1716
1717 n = rb_first(&iommu->dma_list);
1718
1719 for (; n; n = rb_next(n)) {
1720 struct vfio_dma *dma;
1721 dma_addr_t iova;
1722
1723 dma = rb_entry(n, struct vfio_dma, node);
1724 iova = dma->iova;
1725
1726 while (iova < dma->iova + dma->size) {
1727 phys_addr_t phys;
1728 size_t size;
1729
1730 if (dma->iommu_mapped) {
1731 phys_addr_t p;
1732 dma_addr_t i;
1733
1734 if (WARN_ON(!d)) { /* mapped w/o a domain?! */
1735 ret = -EINVAL;
1736 goto unwind;
1737 }
1738
1739 phys = iommu_iova_to_phys(d->domain, iova);
1740
1741 if (WARN_ON(!phys)) {
1742 iova += PAGE_SIZE;
1743 continue;
1744 }
1745
1746 size = PAGE_SIZE;
1747 p = phys + size;
1748 i = iova + size;
1749 while (i < dma->iova + dma->size &&
1750 p == iommu_iova_to_phys(d->domain, i)) {
1751 size += PAGE_SIZE;
1752 p += PAGE_SIZE;
1753 i += PAGE_SIZE;
1754 }
1755 } else {
1756 unsigned long pfn;
1757 unsigned long vaddr = dma->vaddr +
1758 (iova - dma->iova);
1759 size_t n = dma->iova + dma->size - iova;
1760 long npage;
1761
1762 npage = vfio_pin_pages_remote(dma, vaddr,
1763 n >> PAGE_SHIFT,
1764 &pfn, limit,
1765 &batch);
1766 if (npage <= 0) {
1767 WARN_ON(!npage);
1768 ret = (int)npage;
1769 goto unwind;
1770 }
1771
1772 phys = pfn << PAGE_SHIFT;
1773 size = npage << PAGE_SHIFT;
1774 }
1775
1776 ret = iommu_map(domain->domain, iova, phys,
1777 size, dma->prot | domain->prot);
1778 if (ret) {
1779 if (!dma->iommu_mapped) {
1780 vfio_unpin_pages_remote(dma, iova,
1781 phys >> PAGE_SHIFT,
1782 size >> PAGE_SHIFT,
1783 true);
1784 vfio_batch_unpin(&batch, dma);
1785 }
1786 goto unwind;
1787 }
1788
1789 iova += size;
1790 }
1791 }
1792
1793 /* All dmas are now mapped, defer to second tree walk for unwind */
1794 for (n = rb_first(&iommu->dma_list); n; n = rb_next(n)) {
1795 struct vfio_dma *dma = rb_entry(n, struct vfio_dma, node);
1796
1797 dma->iommu_mapped = true;
1798 }
1799
1800 vfio_batch_fini(&batch);
1801 return 0;
1802
1803 unwind:
1804 for (; n; n = rb_prev(n)) {
1805 struct vfio_dma *dma = rb_entry(n, struct vfio_dma, node);
1806 dma_addr_t iova;
1807
1808 if (dma->iommu_mapped) {
1809 iommu_unmap(domain->domain, dma->iova, dma->size);
1810 continue;
1811 }
1812
1813 iova = dma->iova;
1814 while (iova < dma->iova + dma->size) {
1815 phys_addr_t phys, p;
1816 size_t size;
1817 dma_addr_t i;
1818
1819 phys = iommu_iova_to_phys(domain->domain, iova);
1820 if (!phys) {
1821 iova += PAGE_SIZE;
1822 continue;
1823 }
1824
1825 size = PAGE_SIZE;
1826 p = phys + size;
1827 i = iova + size;
1828 while (i < dma->iova + dma->size &&
1829 p == iommu_iova_to_phys(domain->domain, i)) {
1830 size += PAGE_SIZE;
1831 p += PAGE_SIZE;
1832 i += PAGE_SIZE;
1833 }
1834
1835 iommu_unmap(domain->domain, iova, size);
1836 vfio_unpin_pages_remote(dma, iova, phys >> PAGE_SHIFT,
1837 size >> PAGE_SHIFT, true);
1838 }
1839 }
1840
1841 vfio_batch_fini(&batch);
1842 return ret;
1843 }
1844
1845 /*
1846 * We change our unmap behavior slightly depending on whether the IOMMU
1847 * supports fine-grained superpages. IOMMUs like AMD-Vi will use a superpage
1848 * for practically any contiguous power-of-two mapping we give it. This means
1849 * we don't need to look for contiguous chunks ourselves to make unmapping
1850 * more efficient. On IOMMUs with coarse-grained super pages, like Intel VT-d
1851 * with discrete 2M/1G/512G/1T superpages, identifying contiguous chunks
1852 * significantly boosts non-hugetlbfs mappings and doesn't seem to hurt when
1853 * hugetlbfs is in use.
1854 */
vfio_test_domain_fgsp(struct vfio_domain * domain)1855 static void vfio_test_domain_fgsp(struct vfio_domain *domain)
1856 {
1857 struct page *pages;
1858 int ret, order = get_order(PAGE_SIZE * 2);
1859
1860 pages = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
1861 if (!pages)
1862 return;
1863
1864 ret = iommu_map(domain->domain, 0, page_to_phys(pages), PAGE_SIZE * 2,
1865 IOMMU_READ | IOMMU_WRITE | domain->prot);
1866 if (!ret) {
1867 size_t unmapped = iommu_unmap(domain->domain, 0, PAGE_SIZE);
1868
1869 if (unmapped == PAGE_SIZE)
1870 iommu_unmap(domain->domain, PAGE_SIZE, PAGE_SIZE);
1871 else
1872 domain->fgsp = true;
1873 }
1874
1875 __free_pages(pages, order);
1876 }
1877
find_iommu_group(struct vfio_domain * domain,struct iommu_group * iommu_group)1878 static struct vfio_group *find_iommu_group(struct vfio_domain *domain,
1879 struct iommu_group *iommu_group)
1880 {
1881 struct vfio_group *g;
1882
1883 list_for_each_entry(g, &domain->group_list, next) {
1884 if (g->iommu_group == iommu_group)
1885 return g;
1886 }
1887
1888 return NULL;
1889 }
1890
vfio_iommu_find_iommu_group(struct vfio_iommu * iommu,struct iommu_group * iommu_group)1891 static struct vfio_group *vfio_iommu_find_iommu_group(struct vfio_iommu *iommu,
1892 struct iommu_group *iommu_group)
1893 {
1894 struct vfio_domain *domain;
1895 struct vfio_group *group = NULL;
1896
1897 list_for_each_entry(domain, &iommu->domain_list, next) {
1898 group = find_iommu_group(domain, iommu_group);
1899 if (group)
1900 return group;
1901 }
1902
1903 if (iommu->external_domain)
1904 group = find_iommu_group(iommu->external_domain, iommu_group);
1905
1906 return group;
1907 }
1908
vfio_iommu_has_sw_msi(struct list_head * group_resv_regions,phys_addr_t * base)1909 static bool vfio_iommu_has_sw_msi(struct list_head *group_resv_regions,
1910 phys_addr_t *base)
1911 {
1912 struct iommu_resv_region *region;
1913 bool ret = false;
1914
1915 list_for_each_entry(region, group_resv_regions, list) {
1916 /*
1917 * The presence of any 'real' MSI regions should take
1918 * precedence over the software-managed one if the
1919 * IOMMU driver happens to advertise both types.
1920 */
1921 if (region->type == IOMMU_RESV_MSI) {
1922 ret = false;
1923 break;
1924 }
1925
1926 if (region->type == IOMMU_RESV_SW_MSI) {
1927 *base = region->start;
1928 ret = true;
1929 }
1930 }
1931
1932 return ret;
1933 }
1934
vfio_mdev_attach_domain(struct device * dev,void * data)1935 static int vfio_mdev_attach_domain(struct device *dev, void *data)
1936 {
1937 struct mdev_device *mdev = to_mdev_device(dev);
1938 struct iommu_domain *domain = data;
1939 struct device *iommu_device;
1940
1941 iommu_device = mdev_get_iommu_device(mdev);
1942 if (iommu_device) {
1943 if (iommu_dev_feature_enabled(iommu_device, IOMMU_DEV_FEAT_AUX))
1944 return iommu_aux_attach_device(domain, iommu_device);
1945 else
1946 return iommu_attach_device(domain, iommu_device);
1947 }
1948
1949 return -EINVAL;
1950 }
1951
vfio_mdev_detach_domain(struct device * dev,void * data)1952 static int vfio_mdev_detach_domain(struct device *dev, void *data)
1953 {
1954 struct mdev_device *mdev = to_mdev_device(dev);
1955 struct iommu_domain *domain = data;
1956 struct device *iommu_device;
1957
1958 iommu_device = mdev_get_iommu_device(mdev);
1959 if (iommu_device) {
1960 if (iommu_dev_feature_enabled(iommu_device, IOMMU_DEV_FEAT_AUX))
1961 iommu_aux_detach_device(domain, iommu_device);
1962 else
1963 iommu_detach_device(domain, iommu_device);
1964 }
1965
1966 return 0;
1967 }
1968
vfio_iommu_attach_group(struct vfio_domain * domain,struct vfio_group * group)1969 static int vfio_iommu_attach_group(struct vfio_domain *domain,
1970 struct vfio_group *group)
1971 {
1972 if (group->mdev_group)
1973 return iommu_group_for_each_dev(group->iommu_group,
1974 domain->domain,
1975 vfio_mdev_attach_domain);
1976 else
1977 return iommu_attach_group(domain->domain, group->iommu_group);
1978 }
1979
vfio_iommu_detach_group(struct vfio_domain * domain,struct vfio_group * group)1980 static void vfio_iommu_detach_group(struct vfio_domain *domain,
1981 struct vfio_group *group)
1982 {
1983 if (group->mdev_group)
1984 iommu_group_for_each_dev(group->iommu_group, domain->domain,
1985 vfio_mdev_detach_domain);
1986 else
1987 iommu_detach_group(domain->domain, group->iommu_group);
1988 }
1989
vfio_bus_is_mdev(struct bus_type * bus)1990 static bool vfio_bus_is_mdev(struct bus_type *bus)
1991 {
1992 struct bus_type *mdev_bus;
1993 bool ret = false;
1994
1995 mdev_bus = symbol_get(mdev_bus_type);
1996 if (mdev_bus) {
1997 ret = (bus == mdev_bus);
1998 symbol_put(mdev_bus_type);
1999 }
2000
2001 return ret;
2002 }
2003
vfio_mdev_iommu_device(struct device * dev,void * data)2004 static int vfio_mdev_iommu_device(struct device *dev, void *data)
2005 {
2006 struct mdev_device *mdev = to_mdev_device(dev);
2007 struct device **old = data, *new;
2008
2009 new = mdev_get_iommu_device(mdev);
2010 if (!new || (*old && *old != new))
2011 return -EINVAL;
2012
2013 *old = new;
2014
2015 return 0;
2016 }
2017
2018 /*
2019 * This is a helper function to insert an address range to iova list.
2020 * The list is initially created with a single entry corresponding to
2021 * the IOMMU domain geometry to which the device group is attached.
2022 * The list aperture gets modified when a new domain is added to the
2023 * container if the new aperture doesn't conflict with the current one
2024 * or with any existing dma mappings. The list is also modified to
2025 * exclude any reserved regions associated with the device group.
2026 */
vfio_iommu_iova_insert(struct list_head * head,dma_addr_t start,dma_addr_t end)2027 static int vfio_iommu_iova_insert(struct list_head *head,
2028 dma_addr_t start, dma_addr_t end)
2029 {
2030 struct vfio_iova *region;
2031
2032 region = kmalloc(sizeof(*region), GFP_KERNEL);
2033 if (!region)
2034 return -ENOMEM;
2035
2036 INIT_LIST_HEAD(®ion->list);
2037 region->start = start;
2038 region->end = end;
2039
2040 list_add_tail(®ion->list, head);
2041 return 0;
2042 }
2043
2044 /*
2045 * Check the new iommu aperture conflicts with existing aper or with any
2046 * existing dma mappings.
2047 */
vfio_iommu_aper_conflict(struct vfio_iommu * iommu,dma_addr_t start,dma_addr_t end)2048 static bool vfio_iommu_aper_conflict(struct vfio_iommu *iommu,
2049 dma_addr_t start, dma_addr_t end)
2050 {
2051 struct vfio_iova *first, *last;
2052 struct list_head *iova = &iommu->iova_list;
2053
2054 if (list_empty(iova))
2055 return false;
2056
2057 /* Disjoint sets, return conflict */
2058 first = list_first_entry(iova, struct vfio_iova, list);
2059 last = list_last_entry(iova, struct vfio_iova, list);
2060 if (start > last->end || end < first->start)
2061 return true;
2062
2063 /* Check for any existing dma mappings below the new start */
2064 if (start > first->start) {
2065 if (vfio_find_dma(iommu, first->start, start - first->start))
2066 return true;
2067 }
2068
2069 /* Check for any existing dma mappings beyond the new end */
2070 if (end < last->end) {
2071 if (vfio_find_dma(iommu, end + 1, last->end - end))
2072 return true;
2073 }
2074
2075 return false;
2076 }
2077
2078 /*
2079 * Resize iommu iova aperture window. This is called only if the new
2080 * aperture has no conflict with existing aperture and dma mappings.
2081 */
vfio_iommu_aper_resize(struct list_head * iova,dma_addr_t start,dma_addr_t end)2082 static int vfio_iommu_aper_resize(struct list_head *iova,
2083 dma_addr_t start, dma_addr_t end)
2084 {
2085 struct vfio_iova *node, *next;
2086
2087 if (list_empty(iova))
2088 return vfio_iommu_iova_insert(iova, start, end);
2089
2090 /* Adjust iova list start */
2091 list_for_each_entry_safe(node, next, iova, list) {
2092 if (start < node->start)
2093 break;
2094 if (start >= node->start && start < node->end) {
2095 node->start = start;
2096 break;
2097 }
2098 /* Delete nodes before new start */
2099 list_del(&node->list);
2100 kfree(node);
2101 }
2102
2103 /* Adjust iova list end */
2104 list_for_each_entry_safe(node, next, iova, list) {
2105 if (end > node->end)
2106 continue;
2107 if (end > node->start && end <= node->end) {
2108 node->end = end;
2109 continue;
2110 }
2111 /* Delete nodes after new end */
2112 list_del(&node->list);
2113 kfree(node);
2114 }
2115
2116 return 0;
2117 }
2118
2119 /*
2120 * Check reserved region conflicts with existing dma mappings
2121 */
vfio_iommu_resv_conflict(struct vfio_iommu * iommu,struct list_head * resv_regions)2122 static bool vfio_iommu_resv_conflict(struct vfio_iommu *iommu,
2123 struct list_head *resv_regions)
2124 {
2125 struct iommu_resv_region *region;
2126
2127 /* Check for conflict with existing dma mappings */
2128 list_for_each_entry(region, resv_regions, list) {
2129 if (region->type == IOMMU_RESV_DIRECT_RELAXABLE)
2130 continue;
2131
2132 if (vfio_find_dma(iommu, region->start, region->length))
2133 return true;
2134 }
2135
2136 return false;
2137 }
2138
2139 /*
2140 * Check iova region overlap with reserved regions and
2141 * exclude them from the iommu iova range
2142 */
vfio_iommu_resv_exclude(struct list_head * iova,struct list_head * resv_regions)2143 static int vfio_iommu_resv_exclude(struct list_head *iova,
2144 struct list_head *resv_regions)
2145 {
2146 struct iommu_resv_region *resv;
2147 struct vfio_iova *n, *next;
2148
2149 list_for_each_entry(resv, resv_regions, list) {
2150 phys_addr_t start, end;
2151
2152 if (resv->type == IOMMU_RESV_DIRECT_RELAXABLE)
2153 continue;
2154
2155 start = resv->start;
2156 end = resv->start + resv->length - 1;
2157
2158 list_for_each_entry_safe(n, next, iova, list) {
2159 int ret = 0;
2160
2161 /* No overlap */
2162 if (start > n->end || end < n->start)
2163 continue;
2164 /*
2165 * Insert a new node if current node overlaps with the
2166 * reserve region to exclude that from valid iova range.
2167 * Note that, new node is inserted before the current
2168 * node and finally the current node is deleted keeping
2169 * the list updated and sorted.
2170 */
2171 if (start > n->start)
2172 ret = vfio_iommu_iova_insert(&n->list, n->start,
2173 start - 1);
2174 if (!ret && end < n->end)
2175 ret = vfio_iommu_iova_insert(&n->list, end + 1,
2176 n->end);
2177 if (ret)
2178 return ret;
2179
2180 list_del(&n->list);
2181 kfree(n);
2182 }
2183 }
2184
2185 if (list_empty(iova))
2186 return -EINVAL;
2187
2188 return 0;
2189 }
2190
vfio_iommu_resv_free(struct list_head * resv_regions)2191 static void vfio_iommu_resv_free(struct list_head *resv_regions)
2192 {
2193 struct iommu_resv_region *n, *next;
2194
2195 list_for_each_entry_safe(n, next, resv_regions, list) {
2196 list_del(&n->list);
2197 kfree(n);
2198 }
2199 }
2200
vfio_iommu_iova_free(struct list_head * iova)2201 static void vfio_iommu_iova_free(struct list_head *iova)
2202 {
2203 struct vfio_iova *n, *next;
2204
2205 list_for_each_entry_safe(n, next, iova, list) {
2206 list_del(&n->list);
2207 kfree(n);
2208 }
2209 }
2210
vfio_iommu_iova_get_copy(struct vfio_iommu * iommu,struct list_head * iova_copy)2211 static int vfio_iommu_iova_get_copy(struct vfio_iommu *iommu,
2212 struct list_head *iova_copy)
2213 {
2214 struct list_head *iova = &iommu->iova_list;
2215 struct vfio_iova *n;
2216 int ret;
2217
2218 list_for_each_entry(n, iova, list) {
2219 ret = vfio_iommu_iova_insert(iova_copy, n->start, n->end);
2220 if (ret)
2221 goto out_free;
2222 }
2223
2224 return 0;
2225
2226 out_free:
2227 vfio_iommu_iova_free(iova_copy);
2228 return ret;
2229 }
2230
vfio_iommu_iova_insert_copy(struct vfio_iommu * iommu,struct list_head * iova_copy)2231 static void vfio_iommu_iova_insert_copy(struct vfio_iommu *iommu,
2232 struct list_head *iova_copy)
2233 {
2234 struct list_head *iova = &iommu->iova_list;
2235
2236 vfio_iommu_iova_free(iova);
2237
2238 list_splice_tail(iova_copy, iova);
2239 }
2240
vfio_iommu_type1_attach_group(void * iommu_data,struct iommu_group * iommu_group)2241 static int vfio_iommu_type1_attach_group(void *iommu_data,
2242 struct iommu_group *iommu_group)
2243 {
2244 struct vfio_iommu *iommu = iommu_data;
2245 struct vfio_group *group;
2246 struct vfio_domain *domain, *d;
2247 struct bus_type *bus = NULL;
2248 int ret;
2249 bool resv_msi, msi_remap;
2250 phys_addr_t resv_msi_base = 0;
2251 struct iommu_domain_geometry *geo;
2252 LIST_HEAD(iova_copy);
2253 LIST_HEAD(group_resv_regions);
2254
2255 mutex_lock(&iommu->lock);
2256
2257 /* Check for duplicates */
2258 if (vfio_iommu_find_iommu_group(iommu, iommu_group)) {
2259 mutex_unlock(&iommu->lock);
2260 return -EINVAL;
2261 }
2262
2263 group = kzalloc(sizeof(*group), GFP_KERNEL);
2264 domain = kzalloc(sizeof(*domain), GFP_KERNEL);
2265 if (!group || !domain) {
2266 ret = -ENOMEM;
2267 goto out_free;
2268 }
2269
2270 group->iommu_group = iommu_group;
2271
2272 /* Determine bus_type in order to allocate a domain */
2273 ret = iommu_group_for_each_dev(iommu_group, &bus, vfio_bus_type);
2274 if (ret)
2275 goto out_free;
2276
2277 if (vfio_bus_is_mdev(bus)) {
2278 struct device *iommu_device = NULL;
2279
2280 group->mdev_group = true;
2281
2282 /* Determine the isolation type */
2283 ret = iommu_group_for_each_dev(iommu_group, &iommu_device,
2284 vfio_mdev_iommu_device);
2285 if (ret || !iommu_device) {
2286 if (!iommu->external_domain) {
2287 INIT_LIST_HEAD(&domain->group_list);
2288 iommu->external_domain = domain;
2289 vfio_update_pgsize_bitmap(iommu);
2290 } else {
2291 kfree(domain);
2292 }
2293
2294 list_add(&group->next,
2295 &iommu->external_domain->group_list);
2296 /*
2297 * Non-iommu backed group cannot dirty memory directly,
2298 * it can only use interfaces that provide dirty
2299 * tracking.
2300 * The iommu scope can only be promoted with the
2301 * addition of a dirty tracking group.
2302 */
2303 group->pinned_page_dirty_scope = true;
2304 mutex_unlock(&iommu->lock);
2305
2306 return 0;
2307 }
2308
2309 bus = iommu_device->bus;
2310 }
2311
2312 domain->domain = iommu_domain_alloc(bus);
2313 if (!domain->domain) {
2314 ret = -EIO;
2315 goto out_free;
2316 }
2317
2318 if (iommu->nesting) {
2319 ret = iommu_enable_nesting(domain->domain);
2320 if (ret)
2321 goto out_domain;
2322 }
2323
2324 ret = vfio_iommu_attach_group(domain, group);
2325 if (ret)
2326 goto out_domain;
2327
2328 /* Get aperture info */
2329 geo = &domain->domain->geometry;
2330 if (vfio_iommu_aper_conflict(iommu, geo->aperture_start,
2331 geo->aperture_end)) {
2332 ret = -EINVAL;
2333 goto out_detach;
2334 }
2335
2336 ret = iommu_get_group_resv_regions(iommu_group, &group_resv_regions);
2337 if (ret)
2338 goto out_detach;
2339
2340 if (vfio_iommu_resv_conflict(iommu, &group_resv_regions)) {
2341 ret = -EINVAL;
2342 goto out_detach;
2343 }
2344
2345 /*
2346 * We don't want to work on the original iova list as the list
2347 * gets modified and in case of failure we have to retain the
2348 * original list. Get a copy here.
2349 */
2350 ret = vfio_iommu_iova_get_copy(iommu, &iova_copy);
2351 if (ret)
2352 goto out_detach;
2353
2354 ret = vfio_iommu_aper_resize(&iova_copy, geo->aperture_start,
2355 geo->aperture_end);
2356 if (ret)
2357 goto out_detach;
2358
2359 ret = vfio_iommu_resv_exclude(&iova_copy, &group_resv_regions);
2360 if (ret)
2361 goto out_detach;
2362
2363 resv_msi = vfio_iommu_has_sw_msi(&group_resv_regions, &resv_msi_base);
2364
2365 INIT_LIST_HEAD(&domain->group_list);
2366 list_add(&group->next, &domain->group_list);
2367
2368 msi_remap = irq_domain_check_msi_remap() ||
2369 iommu_capable(bus, IOMMU_CAP_INTR_REMAP);
2370
2371 if (!allow_unsafe_interrupts && !msi_remap) {
2372 pr_warn("%s: No interrupt remapping support. Use the module param \"allow_unsafe_interrupts\" to enable VFIO IOMMU support on this platform\n",
2373 __func__);
2374 ret = -EPERM;
2375 goto out_detach;
2376 }
2377
2378 if (iommu_capable(bus, IOMMU_CAP_CACHE_COHERENCY))
2379 domain->prot |= IOMMU_CACHE;
2380
2381 /*
2382 * Try to match an existing compatible domain. We don't want to
2383 * preclude an IOMMU driver supporting multiple bus_types and being
2384 * able to include different bus_types in the same IOMMU domain, so
2385 * we test whether the domains use the same iommu_ops rather than
2386 * testing if they're on the same bus_type.
2387 */
2388 list_for_each_entry(d, &iommu->domain_list, next) {
2389 if (d->domain->ops == domain->domain->ops &&
2390 d->prot == domain->prot) {
2391 vfio_iommu_detach_group(domain, group);
2392 if (!vfio_iommu_attach_group(d, group)) {
2393 list_add(&group->next, &d->group_list);
2394 iommu_domain_free(domain->domain);
2395 kfree(domain);
2396 goto done;
2397 }
2398
2399 ret = vfio_iommu_attach_group(domain, group);
2400 if (ret)
2401 goto out_domain;
2402 }
2403 }
2404
2405 vfio_test_domain_fgsp(domain);
2406
2407 /* replay mappings on new domains */
2408 ret = vfio_iommu_replay(iommu, domain);
2409 if (ret)
2410 goto out_detach;
2411
2412 if (resv_msi) {
2413 ret = iommu_get_msi_cookie(domain->domain, resv_msi_base);
2414 if (ret && ret != -ENODEV)
2415 goto out_detach;
2416 }
2417
2418 list_add(&domain->next, &iommu->domain_list);
2419 vfio_update_pgsize_bitmap(iommu);
2420 done:
2421 /* Delete the old one and insert new iova list */
2422 vfio_iommu_iova_insert_copy(iommu, &iova_copy);
2423
2424 /*
2425 * An iommu backed group can dirty memory directly and therefore
2426 * demotes the iommu scope until it declares itself dirty tracking
2427 * capable via the page pinning interface.
2428 */
2429 iommu->num_non_pinned_groups++;
2430 mutex_unlock(&iommu->lock);
2431 vfio_iommu_resv_free(&group_resv_regions);
2432
2433 return 0;
2434
2435 out_detach:
2436 vfio_iommu_detach_group(domain, group);
2437 out_domain:
2438 iommu_domain_free(domain->domain);
2439 vfio_iommu_iova_free(&iova_copy);
2440 vfio_iommu_resv_free(&group_resv_regions);
2441 out_free:
2442 kfree(domain);
2443 kfree(group);
2444 mutex_unlock(&iommu->lock);
2445 return ret;
2446 }
2447
vfio_iommu_unmap_unpin_all(struct vfio_iommu * iommu)2448 static void vfio_iommu_unmap_unpin_all(struct vfio_iommu *iommu)
2449 {
2450 struct rb_node *node;
2451
2452 while ((node = rb_first(&iommu->dma_list)))
2453 vfio_remove_dma(iommu, rb_entry(node, struct vfio_dma, node));
2454 }
2455
vfio_iommu_unmap_unpin_reaccount(struct vfio_iommu * iommu)2456 static void vfio_iommu_unmap_unpin_reaccount(struct vfio_iommu *iommu)
2457 {
2458 struct rb_node *n, *p;
2459
2460 n = rb_first(&iommu->dma_list);
2461 for (; n; n = rb_next(n)) {
2462 struct vfio_dma *dma;
2463 long locked = 0, unlocked = 0;
2464
2465 dma = rb_entry(n, struct vfio_dma, node);
2466 unlocked += vfio_unmap_unpin(iommu, dma, false);
2467 p = rb_first(&dma->pfn_list);
2468 for (; p; p = rb_next(p)) {
2469 struct vfio_pfn *vpfn = rb_entry(p, struct vfio_pfn,
2470 node);
2471
2472 if (!is_invalid_reserved_pfn(vpfn->pfn))
2473 locked++;
2474 }
2475 vfio_lock_acct(dma, locked - unlocked, true);
2476 }
2477 }
2478
2479 /*
2480 * Called when a domain is removed in detach. It is possible that
2481 * the removed domain decided the iova aperture window. Modify the
2482 * iova aperture with the smallest window among existing domains.
2483 */
vfio_iommu_aper_expand(struct vfio_iommu * iommu,struct list_head * iova_copy)2484 static void vfio_iommu_aper_expand(struct vfio_iommu *iommu,
2485 struct list_head *iova_copy)
2486 {
2487 struct vfio_domain *domain;
2488 struct vfio_iova *node;
2489 dma_addr_t start = 0;
2490 dma_addr_t end = (dma_addr_t)~0;
2491
2492 if (list_empty(iova_copy))
2493 return;
2494
2495 list_for_each_entry(domain, &iommu->domain_list, next) {
2496 struct iommu_domain_geometry *geo = &domain->domain->geometry;
2497
2498 if (geo->aperture_start > start)
2499 start = geo->aperture_start;
2500 if (geo->aperture_end < end)
2501 end = geo->aperture_end;
2502 }
2503
2504 /* Modify aperture limits. The new aper is either same or bigger */
2505 node = list_first_entry(iova_copy, struct vfio_iova, list);
2506 node->start = start;
2507 node = list_last_entry(iova_copy, struct vfio_iova, list);
2508 node->end = end;
2509 }
2510
2511 /*
2512 * Called when a group is detached. The reserved regions for that
2513 * group can be part of valid iova now. But since reserved regions
2514 * may be duplicated among groups, populate the iova valid regions
2515 * list again.
2516 */
vfio_iommu_resv_refresh(struct vfio_iommu * iommu,struct list_head * iova_copy)2517 static int vfio_iommu_resv_refresh(struct vfio_iommu *iommu,
2518 struct list_head *iova_copy)
2519 {
2520 struct vfio_domain *d;
2521 struct vfio_group *g;
2522 struct vfio_iova *node;
2523 dma_addr_t start, end;
2524 LIST_HEAD(resv_regions);
2525 int ret;
2526
2527 if (list_empty(iova_copy))
2528 return -EINVAL;
2529
2530 list_for_each_entry(d, &iommu->domain_list, next) {
2531 list_for_each_entry(g, &d->group_list, next) {
2532 ret = iommu_get_group_resv_regions(g->iommu_group,
2533 &resv_regions);
2534 if (ret)
2535 goto done;
2536 }
2537 }
2538
2539 node = list_first_entry(iova_copy, struct vfio_iova, list);
2540 start = node->start;
2541 node = list_last_entry(iova_copy, struct vfio_iova, list);
2542 end = node->end;
2543
2544 /* purge the iova list and create new one */
2545 vfio_iommu_iova_free(iova_copy);
2546
2547 ret = vfio_iommu_aper_resize(iova_copy, start, end);
2548 if (ret)
2549 goto done;
2550
2551 /* Exclude current reserved regions from iova ranges */
2552 ret = vfio_iommu_resv_exclude(iova_copy, &resv_regions);
2553 done:
2554 vfio_iommu_resv_free(&resv_regions);
2555 return ret;
2556 }
2557
vfio_iommu_type1_detach_group(void * iommu_data,struct iommu_group * iommu_group)2558 static void vfio_iommu_type1_detach_group(void *iommu_data,
2559 struct iommu_group *iommu_group)
2560 {
2561 struct vfio_iommu *iommu = iommu_data;
2562 struct vfio_domain *domain;
2563 struct vfio_group *group;
2564 bool update_dirty_scope = false;
2565 LIST_HEAD(iova_copy);
2566
2567 mutex_lock(&iommu->lock);
2568
2569 if (iommu->external_domain) {
2570 group = find_iommu_group(iommu->external_domain, iommu_group);
2571 if (group) {
2572 update_dirty_scope = !group->pinned_page_dirty_scope;
2573 list_del(&group->next);
2574 kfree(group);
2575
2576 if (list_empty(&iommu->external_domain->group_list)) {
2577 if (!IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu)) {
2578 WARN_ON(iommu->notifier.head);
2579 vfio_iommu_unmap_unpin_all(iommu);
2580 }
2581
2582 kfree(iommu->external_domain);
2583 iommu->external_domain = NULL;
2584 }
2585 goto detach_group_done;
2586 }
2587 }
2588
2589 /*
2590 * Get a copy of iova list. This will be used to update
2591 * and to replace the current one later. Please note that
2592 * we will leave the original list as it is if update fails.
2593 */
2594 vfio_iommu_iova_get_copy(iommu, &iova_copy);
2595
2596 list_for_each_entry(domain, &iommu->domain_list, next) {
2597 group = find_iommu_group(domain, iommu_group);
2598 if (!group)
2599 continue;
2600
2601 vfio_iommu_detach_group(domain, group);
2602 update_dirty_scope = !group->pinned_page_dirty_scope;
2603 list_del(&group->next);
2604 kfree(group);
2605 /*
2606 * Group ownership provides privilege, if the group list is
2607 * empty, the domain goes away. If it's the last domain with
2608 * iommu and external domain doesn't exist, then all the
2609 * mappings go away too. If it's the last domain with iommu and
2610 * external domain exist, update accounting
2611 */
2612 if (list_empty(&domain->group_list)) {
2613 if (list_is_singular(&iommu->domain_list)) {
2614 if (!iommu->external_domain) {
2615 WARN_ON(iommu->notifier.head);
2616 vfio_iommu_unmap_unpin_all(iommu);
2617 } else {
2618 vfio_iommu_unmap_unpin_reaccount(iommu);
2619 }
2620 }
2621 iommu_domain_free(domain->domain);
2622 list_del(&domain->next);
2623 kfree(domain);
2624 vfio_iommu_aper_expand(iommu, &iova_copy);
2625 vfio_update_pgsize_bitmap(iommu);
2626 }
2627 break;
2628 }
2629
2630 if (!vfio_iommu_resv_refresh(iommu, &iova_copy))
2631 vfio_iommu_iova_insert_copy(iommu, &iova_copy);
2632 else
2633 vfio_iommu_iova_free(&iova_copy);
2634
2635 detach_group_done:
2636 /*
2637 * Removal of a group without dirty tracking may allow the iommu scope
2638 * to be promoted.
2639 */
2640 if (update_dirty_scope) {
2641 iommu->num_non_pinned_groups--;
2642 if (iommu->dirty_page_tracking)
2643 vfio_iommu_populate_bitmap_full(iommu);
2644 }
2645 mutex_unlock(&iommu->lock);
2646 }
2647
vfio_iommu_type1_open(unsigned long arg)2648 static void *vfio_iommu_type1_open(unsigned long arg)
2649 {
2650 struct vfio_iommu *iommu;
2651
2652 iommu = kzalloc(sizeof(*iommu), GFP_KERNEL);
2653 if (!iommu)
2654 return ERR_PTR(-ENOMEM);
2655
2656 switch (arg) {
2657 case VFIO_TYPE1_IOMMU:
2658 break;
2659 case VFIO_TYPE1_NESTING_IOMMU:
2660 iommu->nesting = true;
2661 fallthrough;
2662 case VFIO_TYPE1v2_IOMMU:
2663 iommu->v2 = true;
2664 break;
2665 default:
2666 kfree(iommu);
2667 return ERR_PTR(-EINVAL);
2668 }
2669
2670 INIT_LIST_HEAD(&iommu->domain_list);
2671 INIT_LIST_HEAD(&iommu->iova_list);
2672 iommu->dma_list = RB_ROOT;
2673 iommu->dma_avail = dma_entry_limit;
2674 iommu->container_open = true;
2675 mutex_init(&iommu->lock);
2676 BLOCKING_INIT_NOTIFIER_HEAD(&iommu->notifier);
2677 init_waitqueue_head(&iommu->vaddr_wait);
2678
2679 return iommu;
2680 }
2681
vfio_release_domain(struct vfio_domain * domain,bool external)2682 static void vfio_release_domain(struct vfio_domain *domain, bool external)
2683 {
2684 struct vfio_group *group, *group_tmp;
2685
2686 list_for_each_entry_safe(group, group_tmp,
2687 &domain->group_list, next) {
2688 if (!external)
2689 vfio_iommu_detach_group(domain, group);
2690 list_del(&group->next);
2691 kfree(group);
2692 }
2693
2694 if (!external)
2695 iommu_domain_free(domain->domain);
2696 }
2697
vfio_iommu_type1_release(void * iommu_data)2698 static void vfio_iommu_type1_release(void *iommu_data)
2699 {
2700 struct vfio_iommu *iommu = iommu_data;
2701 struct vfio_domain *domain, *domain_tmp;
2702
2703 if (iommu->external_domain) {
2704 vfio_release_domain(iommu->external_domain, true);
2705 kfree(iommu->external_domain);
2706 }
2707
2708 vfio_iommu_unmap_unpin_all(iommu);
2709
2710 list_for_each_entry_safe(domain, domain_tmp,
2711 &iommu->domain_list, next) {
2712 vfio_release_domain(domain, false);
2713 list_del(&domain->next);
2714 kfree(domain);
2715 }
2716
2717 vfio_iommu_iova_free(&iommu->iova_list);
2718
2719 kfree(iommu);
2720 }
2721
vfio_domains_have_iommu_cache(struct vfio_iommu * iommu)2722 static int vfio_domains_have_iommu_cache(struct vfio_iommu *iommu)
2723 {
2724 struct vfio_domain *domain;
2725 int ret = 1;
2726
2727 mutex_lock(&iommu->lock);
2728 list_for_each_entry(domain, &iommu->domain_list, next) {
2729 if (!(domain->prot & IOMMU_CACHE)) {
2730 ret = 0;
2731 break;
2732 }
2733 }
2734 mutex_unlock(&iommu->lock);
2735
2736 return ret;
2737 }
2738
vfio_iommu_type1_check_extension(struct vfio_iommu * iommu,unsigned long arg)2739 static int vfio_iommu_type1_check_extension(struct vfio_iommu *iommu,
2740 unsigned long arg)
2741 {
2742 switch (arg) {
2743 case VFIO_TYPE1_IOMMU:
2744 case VFIO_TYPE1v2_IOMMU:
2745 case VFIO_TYPE1_NESTING_IOMMU:
2746 case VFIO_UNMAP_ALL:
2747 case VFIO_UPDATE_VADDR:
2748 return 1;
2749 case VFIO_DMA_CC_IOMMU:
2750 if (!iommu)
2751 return 0;
2752 return vfio_domains_have_iommu_cache(iommu);
2753 default:
2754 return 0;
2755 }
2756 }
2757
vfio_iommu_iova_add_cap(struct vfio_info_cap * caps,struct vfio_iommu_type1_info_cap_iova_range * cap_iovas,size_t size)2758 static int vfio_iommu_iova_add_cap(struct vfio_info_cap *caps,
2759 struct vfio_iommu_type1_info_cap_iova_range *cap_iovas,
2760 size_t size)
2761 {
2762 struct vfio_info_cap_header *header;
2763 struct vfio_iommu_type1_info_cap_iova_range *iova_cap;
2764
2765 header = vfio_info_cap_add(caps, size,
2766 VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE, 1);
2767 if (IS_ERR(header))
2768 return PTR_ERR(header);
2769
2770 iova_cap = container_of(header,
2771 struct vfio_iommu_type1_info_cap_iova_range,
2772 header);
2773 iova_cap->nr_iovas = cap_iovas->nr_iovas;
2774 memcpy(iova_cap->iova_ranges, cap_iovas->iova_ranges,
2775 cap_iovas->nr_iovas * sizeof(*cap_iovas->iova_ranges));
2776 return 0;
2777 }
2778
vfio_iommu_iova_build_caps(struct vfio_iommu * iommu,struct vfio_info_cap * caps)2779 static int vfio_iommu_iova_build_caps(struct vfio_iommu *iommu,
2780 struct vfio_info_cap *caps)
2781 {
2782 struct vfio_iommu_type1_info_cap_iova_range *cap_iovas;
2783 struct vfio_iova *iova;
2784 size_t size;
2785 int iovas = 0, i = 0, ret;
2786
2787 list_for_each_entry(iova, &iommu->iova_list, list)
2788 iovas++;
2789
2790 if (!iovas) {
2791 /*
2792 * Return 0 as a container with a single mdev device
2793 * will have an empty list
2794 */
2795 return 0;
2796 }
2797
2798 size = sizeof(*cap_iovas) + (iovas * sizeof(*cap_iovas->iova_ranges));
2799
2800 cap_iovas = kzalloc(size, GFP_KERNEL);
2801 if (!cap_iovas)
2802 return -ENOMEM;
2803
2804 cap_iovas->nr_iovas = iovas;
2805
2806 list_for_each_entry(iova, &iommu->iova_list, list) {
2807 cap_iovas->iova_ranges[i].start = iova->start;
2808 cap_iovas->iova_ranges[i].end = iova->end;
2809 i++;
2810 }
2811
2812 ret = vfio_iommu_iova_add_cap(caps, cap_iovas, size);
2813
2814 kfree(cap_iovas);
2815 return ret;
2816 }
2817
vfio_iommu_migration_build_caps(struct vfio_iommu * iommu,struct vfio_info_cap * caps)2818 static int vfio_iommu_migration_build_caps(struct vfio_iommu *iommu,
2819 struct vfio_info_cap *caps)
2820 {
2821 struct vfio_iommu_type1_info_cap_migration cap_mig;
2822
2823 cap_mig.header.id = VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION;
2824 cap_mig.header.version = 1;
2825
2826 cap_mig.flags = 0;
2827 /* support minimum pgsize */
2828 cap_mig.pgsize_bitmap = (size_t)1 << __ffs(iommu->pgsize_bitmap);
2829 cap_mig.max_dirty_bitmap_size = DIRTY_BITMAP_SIZE_MAX;
2830
2831 return vfio_info_add_capability(caps, &cap_mig.header, sizeof(cap_mig));
2832 }
2833
vfio_iommu_dma_avail_build_caps(struct vfio_iommu * iommu,struct vfio_info_cap * caps)2834 static int vfio_iommu_dma_avail_build_caps(struct vfio_iommu *iommu,
2835 struct vfio_info_cap *caps)
2836 {
2837 struct vfio_iommu_type1_info_dma_avail cap_dma_avail;
2838
2839 cap_dma_avail.header.id = VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL;
2840 cap_dma_avail.header.version = 1;
2841
2842 cap_dma_avail.avail = iommu->dma_avail;
2843
2844 return vfio_info_add_capability(caps, &cap_dma_avail.header,
2845 sizeof(cap_dma_avail));
2846 }
2847
vfio_iommu_type1_get_info(struct vfio_iommu * iommu,unsigned long arg)2848 static int vfio_iommu_type1_get_info(struct vfio_iommu *iommu,
2849 unsigned long arg)
2850 {
2851 struct vfio_iommu_type1_info info;
2852 unsigned long minsz;
2853 struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
2854 unsigned long capsz;
2855 int ret;
2856
2857 minsz = offsetofend(struct vfio_iommu_type1_info, iova_pgsizes);
2858
2859 /* For backward compatibility, cannot require this */
2860 capsz = offsetofend(struct vfio_iommu_type1_info, cap_offset);
2861
2862 if (copy_from_user(&info, (void __user *)arg, minsz))
2863 return -EFAULT;
2864
2865 if (info.argsz < minsz)
2866 return -EINVAL;
2867
2868 if (info.argsz >= capsz) {
2869 minsz = capsz;
2870 info.cap_offset = 0; /* output, no-recopy necessary */
2871 }
2872
2873 mutex_lock(&iommu->lock);
2874 info.flags = VFIO_IOMMU_INFO_PGSIZES;
2875
2876 info.iova_pgsizes = iommu->pgsize_bitmap;
2877
2878 ret = vfio_iommu_migration_build_caps(iommu, &caps);
2879
2880 if (!ret)
2881 ret = vfio_iommu_dma_avail_build_caps(iommu, &caps);
2882
2883 if (!ret)
2884 ret = vfio_iommu_iova_build_caps(iommu, &caps);
2885
2886 mutex_unlock(&iommu->lock);
2887
2888 if (ret)
2889 return ret;
2890
2891 if (caps.size) {
2892 info.flags |= VFIO_IOMMU_INFO_CAPS;
2893
2894 if (info.argsz < sizeof(info) + caps.size) {
2895 info.argsz = sizeof(info) + caps.size;
2896 } else {
2897 vfio_info_cap_shift(&caps, sizeof(info));
2898 if (copy_to_user((void __user *)arg +
2899 sizeof(info), caps.buf,
2900 caps.size)) {
2901 kfree(caps.buf);
2902 return -EFAULT;
2903 }
2904 info.cap_offset = sizeof(info);
2905 }
2906
2907 kfree(caps.buf);
2908 }
2909
2910 return copy_to_user((void __user *)arg, &info, minsz) ?
2911 -EFAULT : 0;
2912 }
2913
vfio_iommu_type1_map_dma(struct vfio_iommu * iommu,unsigned long arg)2914 static int vfio_iommu_type1_map_dma(struct vfio_iommu *iommu,
2915 unsigned long arg)
2916 {
2917 struct vfio_iommu_type1_dma_map map;
2918 unsigned long minsz;
2919 uint32_t mask = VFIO_DMA_MAP_FLAG_READ | VFIO_DMA_MAP_FLAG_WRITE |
2920 VFIO_DMA_MAP_FLAG_VADDR;
2921
2922 minsz = offsetofend(struct vfio_iommu_type1_dma_map, size);
2923
2924 if (copy_from_user(&map, (void __user *)arg, minsz))
2925 return -EFAULT;
2926
2927 if (map.argsz < minsz || map.flags & ~mask)
2928 return -EINVAL;
2929
2930 return vfio_dma_do_map(iommu, &map);
2931 }
2932
vfio_iommu_type1_unmap_dma(struct vfio_iommu * iommu,unsigned long arg)2933 static int vfio_iommu_type1_unmap_dma(struct vfio_iommu *iommu,
2934 unsigned long arg)
2935 {
2936 struct vfio_iommu_type1_dma_unmap unmap;
2937 struct vfio_bitmap bitmap = { 0 };
2938 uint32_t mask = VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP |
2939 VFIO_DMA_UNMAP_FLAG_VADDR |
2940 VFIO_DMA_UNMAP_FLAG_ALL;
2941 unsigned long minsz;
2942 int ret;
2943
2944 minsz = offsetofend(struct vfio_iommu_type1_dma_unmap, size);
2945
2946 if (copy_from_user(&unmap, (void __user *)arg, minsz))
2947 return -EFAULT;
2948
2949 if (unmap.argsz < minsz || unmap.flags & ~mask)
2950 return -EINVAL;
2951
2952 if ((unmap.flags & VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP) &&
2953 (unmap.flags & (VFIO_DMA_UNMAP_FLAG_ALL |
2954 VFIO_DMA_UNMAP_FLAG_VADDR)))
2955 return -EINVAL;
2956
2957 if (unmap.flags & VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP) {
2958 unsigned long pgshift;
2959
2960 if (unmap.argsz < (minsz + sizeof(bitmap)))
2961 return -EINVAL;
2962
2963 if (copy_from_user(&bitmap,
2964 (void __user *)(arg + minsz),
2965 sizeof(bitmap)))
2966 return -EFAULT;
2967
2968 if (!access_ok((void __user *)bitmap.data, bitmap.size))
2969 return -EINVAL;
2970
2971 pgshift = __ffs(bitmap.pgsize);
2972 ret = verify_bitmap_size(unmap.size >> pgshift,
2973 bitmap.size);
2974 if (ret)
2975 return ret;
2976 }
2977
2978 ret = vfio_dma_do_unmap(iommu, &unmap, &bitmap);
2979 if (ret)
2980 return ret;
2981
2982 return copy_to_user((void __user *)arg, &unmap, minsz) ?
2983 -EFAULT : 0;
2984 }
2985
vfio_iommu_type1_dirty_pages(struct vfio_iommu * iommu,unsigned long arg)2986 static int vfio_iommu_type1_dirty_pages(struct vfio_iommu *iommu,
2987 unsigned long arg)
2988 {
2989 struct vfio_iommu_type1_dirty_bitmap dirty;
2990 uint32_t mask = VFIO_IOMMU_DIRTY_PAGES_FLAG_START |
2991 VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP |
2992 VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP;
2993 unsigned long minsz;
2994 int ret = 0;
2995
2996 if (!iommu->v2)
2997 return -EACCES;
2998
2999 minsz = offsetofend(struct vfio_iommu_type1_dirty_bitmap, flags);
3000
3001 if (copy_from_user(&dirty, (void __user *)arg, minsz))
3002 return -EFAULT;
3003
3004 if (dirty.argsz < minsz || dirty.flags & ~mask)
3005 return -EINVAL;
3006
3007 /* only one flag should be set at a time */
3008 if (__ffs(dirty.flags) != __fls(dirty.flags))
3009 return -EINVAL;
3010
3011 if (dirty.flags & VFIO_IOMMU_DIRTY_PAGES_FLAG_START) {
3012 size_t pgsize;
3013
3014 mutex_lock(&iommu->lock);
3015 pgsize = 1 << __ffs(iommu->pgsize_bitmap);
3016 if (!iommu->dirty_page_tracking) {
3017 ret = vfio_dma_bitmap_alloc_all(iommu, pgsize);
3018 if (!ret)
3019 iommu->dirty_page_tracking = true;
3020 }
3021 mutex_unlock(&iommu->lock);
3022 return ret;
3023 } else if (dirty.flags & VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP) {
3024 mutex_lock(&iommu->lock);
3025 if (iommu->dirty_page_tracking) {
3026 iommu->dirty_page_tracking = false;
3027 vfio_dma_bitmap_free_all(iommu);
3028 }
3029 mutex_unlock(&iommu->lock);
3030 return 0;
3031 } else if (dirty.flags & VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP) {
3032 struct vfio_iommu_type1_dirty_bitmap_get range;
3033 unsigned long pgshift;
3034 size_t data_size = dirty.argsz - minsz;
3035 size_t iommu_pgsize;
3036
3037 if (!data_size || data_size < sizeof(range))
3038 return -EINVAL;
3039
3040 if (copy_from_user(&range, (void __user *)(arg + minsz),
3041 sizeof(range)))
3042 return -EFAULT;
3043
3044 if (range.iova + range.size < range.iova)
3045 return -EINVAL;
3046 if (!access_ok((void __user *)range.bitmap.data,
3047 range.bitmap.size))
3048 return -EINVAL;
3049
3050 pgshift = __ffs(range.bitmap.pgsize);
3051 ret = verify_bitmap_size(range.size >> pgshift,
3052 range.bitmap.size);
3053 if (ret)
3054 return ret;
3055
3056 mutex_lock(&iommu->lock);
3057
3058 iommu_pgsize = (size_t)1 << __ffs(iommu->pgsize_bitmap);
3059
3060 /* allow only smallest supported pgsize */
3061 if (range.bitmap.pgsize != iommu_pgsize) {
3062 ret = -EINVAL;
3063 goto out_unlock;
3064 }
3065 if (range.iova & (iommu_pgsize - 1)) {
3066 ret = -EINVAL;
3067 goto out_unlock;
3068 }
3069 if (!range.size || range.size & (iommu_pgsize - 1)) {
3070 ret = -EINVAL;
3071 goto out_unlock;
3072 }
3073
3074 if (iommu->dirty_page_tracking)
3075 ret = vfio_iova_dirty_bitmap(range.bitmap.data,
3076 iommu, range.iova,
3077 range.size,
3078 range.bitmap.pgsize);
3079 else
3080 ret = -EINVAL;
3081 out_unlock:
3082 mutex_unlock(&iommu->lock);
3083
3084 return ret;
3085 }
3086
3087 return -EINVAL;
3088 }
3089
vfio_iommu_type1_ioctl(void * iommu_data,unsigned int cmd,unsigned long arg)3090 static long vfio_iommu_type1_ioctl(void *iommu_data,
3091 unsigned int cmd, unsigned long arg)
3092 {
3093 struct vfio_iommu *iommu = iommu_data;
3094
3095 switch (cmd) {
3096 case VFIO_CHECK_EXTENSION:
3097 return vfio_iommu_type1_check_extension(iommu, arg);
3098 case VFIO_IOMMU_GET_INFO:
3099 return vfio_iommu_type1_get_info(iommu, arg);
3100 case VFIO_IOMMU_MAP_DMA:
3101 return vfio_iommu_type1_map_dma(iommu, arg);
3102 case VFIO_IOMMU_UNMAP_DMA:
3103 return vfio_iommu_type1_unmap_dma(iommu, arg);
3104 case VFIO_IOMMU_DIRTY_PAGES:
3105 return vfio_iommu_type1_dirty_pages(iommu, arg);
3106 default:
3107 return -ENOTTY;
3108 }
3109 }
3110
vfio_iommu_type1_register_notifier(void * iommu_data,unsigned long * events,struct notifier_block * nb)3111 static int vfio_iommu_type1_register_notifier(void *iommu_data,
3112 unsigned long *events,
3113 struct notifier_block *nb)
3114 {
3115 struct vfio_iommu *iommu = iommu_data;
3116
3117 /* clear known events */
3118 *events &= ~VFIO_IOMMU_NOTIFY_DMA_UNMAP;
3119
3120 /* refuse to register if still events remaining */
3121 if (*events)
3122 return -EINVAL;
3123
3124 return blocking_notifier_chain_register(&iommu->notifier, nb);
3125 }
3126
vfio_iommu_type1_unregister_notifier(void * iommu_data,struct notifier_block * nb)3127 static int vfio_iommu_type1_unregister_notifier(void *iommu_data,
3128 struct notifier_block *nb)
3129 {
3130 struct vfio_iommu *iommu = iommu_data;
3131
3132 return blocking_notifier_chain_unregister(&iommu->notifier, nb);
3133 }
3134
vfio_iommu_type1_dma_rw_chunk(struct vfio_iommu * iommu,dma_addr_t user_iova,void * data,size_t count,bool write,size_t * copied)3135 static int vfio_iommu_type1_dma_rw_chunk(struct vfio_iommu *iommu,
3136 dma_addr_t user_iova, void *data,
3137 size_t count, bool write,
3138 size_t *copied)
3139 {
3140 struct mm_struct *mm;
3141 unsigned long vaddr;
3142 struct vfio_dma *dma;
3143 bool kthread = current->mm == NULL;
3144 size_t offset;
3145 int ret;
3146
3147 *copied = 0;
3148
3149 ret = vfio_find_dma_valid(iommu, user_iova, 1, &dma);
3150 if (ret < 0)
3151 return ret;
3152
3153 if ((write && !(dma->prot & IOMMU_WRITE)) ||
3154 !(dma->prot & IOMMU_READ))
3155 return -EPERM;
3156
3157 mm = get_task_mm(dma->task);
3158
3159 if (!mm)
3160 return -EPERM;
3161
3162 if (kthread)
3163 kthread_use_mm(mm);
3164 else if (current->mm != mm)
3165 goto out;
3166
3167 offset = user_iova - dma->iova;
3168
3169 if (count > dma->size - offset)
3170 count = dma->size - offset;
3171
3172 vaddr = dma->vaddr + offset;
3173
3174 if (write) {
3175 *copied = copy_to_user((void __user *)vaddr, data,
3176 count) ? 0 : count;
3177 if (*copied && iommu->dirty_page_tracking) {
3178 unsigned long pgshift = __ffs(iommu->pgsize_bitmap);
3179 /*
3180 * Bitmap populated with the smallest supported page
3181 * size
3182 */
3183 bitmap_set(dma->bitmap, offset >> pgshift,
3184 ((offset + *copied - 1) >> pgshift) -
3185 (offset >> pgshift) + 1);
3186 }
3187 } else
3188 *copied = copy_from_user(data, (void __user *)vaddr,
3189 count) ? 0 : count;
3190 if (kthread)
3191 kthread_unuse_mm(mm);
3192 out:
3193 mmput(mm);
3194 return *copied ? 0 : -EFAULT;
3195 }
3196
vfio_iommu_type1_dma_rw(void * iommu_data,dma_addr_t user_iova,void * data,size_t count,bool write)3197 static int vfio_iommu_type1_dma_rw(void *iommu_data, dma_addr_t user_iova,
3198 void *data, size_t count, bool write)
3199 {
3200 struct vfio_iommu *iommu = iommu_data;
3201 int ret = 0;
3202 size_t done;
3203
3204 mutex_lock(&iommu->lock);
3205 while (count > 0) {
3206 ret = vfio_iommu_type1_dma_rw_chunk(iommu, user_iova, data,
3207 count, write, &done);
3208 if (ret)
3209 break;
3210
3211 count -= done;
3212 data += done;
3213 user_iova += done;
3214 }
3215
3216 mutex_unlock(&iommu->lock);
3217 return ret;
3218 }
3219
3220 static struct iommu_domain *
vfio_iommu_type1_group_iommu_domain(void * iommu_data,struct iommu_group * iommu_group)3221 vfio_iommu_type1_group_iommu_domain(void *iommu_data,
3222 struct iommu_group *iommu_group)
3223 {
3224 struct iommu_domain *domain = ERR_PTR(-ENODEV);
3225 struct vfio_iommu *iommu = iommu_data;
3226 struct vfio_domain *d;
3227
3228 if (!iommu || !iommu_group)
3229 return ERR_PTR(-EINVAL);
3230
3231 mutex_lock(&iommu->lock);
3232 list_for_each_entry(d, &iommu->domain_list, next) {
3233 if (find_iommu_group(d, iommu_group)) {
3234 domain = d->domain;
3235 break;
3236 }
3237 }
3238 mutex_unlock(&iommu->lock);
3239
3240 return domain;
3241 }
3242
vfio_iommu_type1_notify(void * iommu_data,enum vfio_iommu_notify_type event)3243 static void vfio_iommu_type1_notify(void *iommu_data,
3244 enum vfio_iommu_notify_type event)
3245 {
3246 struct vfio_iommu *iommu = iommu_data;
3247
3248 if (event != VFIO_IOMMU_CONTAINER_CLOSE)
3249 return;
3250 mutex_lock(&iommu->lock);
3251 iommu->container_open = false;
3252 mutex_unlock(&iommu->lock);
3253 wake_up_all(&iommu->vaddr_wait);
3254 }
3255
3256 static const struct vfio_iommu_driver_ops vfio_iommu_driver_ops_type1 = {
3257 .name = "vfio-iommu-type1",
3258 .owner = THIS_MODULE,
3259 .open = vfio_iommu_type1_open,
3260 .release = vfio_iommu_type1_release,
3261 .ioctl = vfio_iommu_type1_ioctl,
3262 .attach_group = vfio_iommu_type1_attach_group,
3263 .detach_group = vfio_iommu_type1_detach_group,
3264 .pin_pages = vfio_iommu_type1_pin_pages,
3265 .unpin_pages = vfio_iommu_type1_unpin_pages,
3266 .register_notifier = vfio_iommu_type1_register_notifier,
3267 .unregister_notifier = vfio_iommu_type1_unregister_notifier,
3268 .dma_rw = vfio_iommu_type1_dma_rw,
3269 .group_iommu_domain = vfio_iommu_type1_group_iommu_domain,
3270 .notify = vfio_iommu_type1_notify,
3271 };
3272
vfio_iommu_type1_init(void)3273 static int __init vfio_iommu_type1_init(void)
3274 {
3275 return vfio_register_iommu_driver(&vfio_iommu_driver_ops_type1);
3276 }
3277
vfio_iommu_type1_cleanup(void)3278 static void __exit vfio_iommu_type1_cleanup(void)
3279 {
3280 vfio_unregister_iommu_driver(&vfio_iommu_driver_ops_type1);
3281 }
3282
3283 module_init(vfio_iommu_type1_init);
3284 module_exit(vfio_iommu_type1_cleanup);
3285
3286 MODULE_VERSION(DRIVER_VERSION);
3287 MODULE_LICENSE("GPL v2");
3288 MODULE_AUTHOR(DRIVER_AUTHOR);
3289 MODULE_DESCRIPTION(DRIVER_DESC);
3290