2 * VFIO: IOMMU DMA mapping support for Type1 IOMMU
4 * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
5 * Author: Alex Williamson <alex.williamson@redhat.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * Derived from original vfio:
12 * Copyright 2010 Cisco Systems, Inc. All rights reserved.
13 * Author: Tom Lyon, pugs@cisco.com
15 * We arbitrarily define a Type1 IOMMU as one matching the below code.
16 * It could be called the x86 IOMMU as it's designed for AMD-Vi & Intel
17 * VT-d, but that makes it harder to re-use as theoretically anyone
18 * implementing a similar IOMMU could make use of this. We expect the
19 * IOMMU to support the IOMMU API and have few to no restrictions around
20 * the IOVA range that can be mapped. The Type1 IOMMU is currently
21 * optimized for relatively static mappings of a userspace process with
22 * userpsace pages pinned into memory. We also assume devices and IOMMU
23 * domains are PCI based as the IOMMU API is still centered around a
24 * device/bus interface rather than a group interface.
27 #include <linux/compat.h>
28 #include <linux/device.h>
30 #include <linux/iommu.h>
31 #include <linux/module.h>
33 #include <linux/rbtree.h>
34 #include <linux/sched/signal.h>
35 #include <linux/sched/mm.h>
36 #include <linux/slab.h>
37 #include <linux/uaccess.h>
38 #include <linux/vfio.h>
39 #include <linux/workqueue.h>
40 #include <linux/mdev.h>
41 #include <linux/notifier.h>
42 #include <linux/dma-iommu.h>
43 #include <linux/irqdomain.h>
45 #define DRIVER_VERSION "0.2"
46 #define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
47 #define DRIVER_DESC "Type1 IOMMU driver for VFIO"
49 static bool allow_unsafe_interrupts
;
50 module_param_named(allow_unsafe_interrupts
,
51 allow_unsafe_interrupts
, bool, S_IRUGO
| S_IWUSR
);
52 MODULE_PARM_DESC(allow_unsafe_interrupts
,
53 "Enable VFIO IOMMU support for on platforms without interrupt remapping support.");
55 static bool disable_hugepages
;
56 module_param_named(disable_hugepages
,
57 disable_hugepages
, bool, S_IRUGO
| S_IWUSR
);
58 MODULE_PARM_DESC(disable_hugepages
,
59 "Disable VFIO IOMMU support for IOMMU hugepages.");
62 struct list_head domain_list
;
63 struct vfio_domain
*external_domain
; /* domain for external user */
65 struct rb_root dma_list
;
66 struct blocking_notifier_head notifier
;
72 struct iommu_domain
*domain
;
73 struct list_head next
;
74 struct list_head group_list
;
75 int prot
; /* IOMMU_CACHE */
76 bool fgsp
; /* Fine-grained super pages */
81 dma_addr_t iova
; /* Device address */
82 unsigned long vaddr
; /* Process virtual addr */
83 size_t size
; /* Map size (bytes) */
84 int prot
; /* IOMMU_READ/WRITE */
86 bool lock_cap
; /* capable(CAP_IPC_LOCK) */
87 struct task_struct
*task
;
88 struct rb_root pfn_list
; /* Ex-user pinned pfn list */
92 struct iommu_group
*iommu_group
;
93 struct list_head next
;
97 * Guest RAM pinning working set or DMA target
101 dma_addr_t iova
; /* Device address */
102 unsigned long pfn
; /* Host pfn */
106 struct vfio_regions
{
107 struct list_head list
;
113 #define IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu) \
114 (!list_empty(&iommu->domain_list))
116 static int put_pfn(unsigned long pfn
, int prot
);
119 * This code handles mapping and unmapping of user data buffers
120 * into DMA'ble space using the IOMMU
123 static struct vfio_dma
*vfio_find_dma(struct vfio_iommu
*iommu
,
124 dma_addr_t start
, size_t size
)
126 struct rb_node
*node
= iommu
->dma_list
.rb_node
;
129 struct vfio_dma
*dma
= rb_entry(node
, struct vfio_dma
, node
);
131 if (start
+ size
<= dma
->iova
)
132 node
= node
->rb_left
;
133 else if (start
>= dma
->iova
+ dma
->size
)
134 node
= node
->rb_right
;
142 static void vfio_link_dma(struct vfio_iommu
*iommu
, struct vfio_dma
*new)
144 struct rb_node
**link
= &iommu
->dma_list
.rb_node
, *parent
= NULL
;
145 struct vfio_dma
*dma
;
149 dma
= rb_entry(parent
, struct vfio_dma
, node
);
151 if (new->iova
+ new->size
<= dma
->iova
)
152 link
= &(*link
)->rb_left
;
154 link
= &(*link
)->rb_right
;
157 rb_link_node(&new->node
, parent
, link
);
158 rb_insert_color(&new->node
, &iommu
->dma_list
);
161 static void vfio_unlink_dma(struct vfio_iommu
*iommu
, struct vfio_dma
*old
)
163 rb_erase(&old
->node
, &iommu
->dma_list
);
167 * Helper Functions for host iova-pfn list
169 static struct vfio_pfn
*vfio_find_vpfn(struct vfio_dma
*dma
, dma_addr_t iova
)
171 struct vfio_pfn
*vpfn
;
172 struct rb_node
*node
= dma
->pfn_list
.rb_node
;
175 vpfn
= rb_entry(node
, struct vfio_pfn
, node
);
177 if (iova
< vpfn
->iova
)
178 node
= node
->rb_left
;
179 else if (iova
> vpfn
->iova
)
180 node
= node
->rb_right
;
187 static void vfio_link_pfn(struct vfio_dma
*dma
,
188 struct vfio_pfn
*new)
190 struct rb_node
**link
, *parent
= NULL
;
191 struct vfio_pfn
*vpfn
;
193 link
= &dma
->pfn_list
.rb_node
;
196 vpfn
= rb_entry(parent
, struct vfio_pfn
, node
);
198 if (new->iova
< vpfn
->iova
)
199 link
= &(*link
)->rb_left
;
201 link
= &(*link
)->rb_right
;
204 rb_link_node(&new->node
, parent
, link
);
205 rb_insert_color(&new->node
, &dma
->pfn_list
);
208 static void vfio_unlink_pfn(struct vfio_dma
*dma
, struct vfio_pfn
*old
)
210 rb_erase(&old
->node
, &dma
->pfn_list
);
213 static int vfio_add_to_pfn_list(struct vfio_dma
*dma
, dma_addr_t iova
,
216 struct vfio_pfn
*vpfn
;
218 vpfn
= kzalloc(sizeof(*vpfn
), GFP_KERNEL
);
224 atomic_set(&vpfn
->ref_count
, 1);
225 vfio_link_pfn(dma
, vpfn
);
229 static void vfio_remove_from_pfn_list(struct vfio_dma
*dma
,
230 struct vfio_pfn
*vpfn
)
232 vfio_unlink_pfn(dma
, vpfn
);
236 static struct vfio_pfn
*vfio_iova_get_vfio_pfn(struct vfio_dma
*dma
,
239 struct vfio_pfn
*vpfn
= vfio_find_vpfn(dma
, iova
);
242 atomic_inc(&vpfn
->ref_count
);
246 static int vfio_iova_put_vfio_pfn(struct vfio_dma
*dma
, struct vfio_pfn
*vpfn
)
250 if (atomic_dec_and_test(&vpfn
->ref_count
)) {
251 ret
= put_pfn(vpfn
->pfn
, dma
->prot
);
252 vfio_remove_from_pfn_list(dma
, vpfn
);
257 static int vfio_lock_acct(struct vfio_dma
*dma
, long npage
, bool async
)
259 struct mm_struct
*mm
;
265 mm
= async
? get_task_mm(dma
->task
) : dma
->task
->mm
;
267 return -ESRCH
; /* process exited */
269 ret
= down_write_killable(&mm
->mmap_sem
);
272 if (!dma
->lock_cap
) {
275 limit
= task_rlimit(dma
->task
,
276 RLIMIT_MEMLOCK
) >> PAGE_SHIFT
;
278 if (mm
->locked_vm
+ npage
> limit
)
284 mm
->locked_vm
+= npage
;
286 up_write(&mm
->mmap_sem
);
296 * Some mappings aren't backed by a struct page, for example an mmap'd
297 * MMIO range for our own or another device. These use a different
298 * pfn conversion and shouldn't be tracked as locked pages.
300 static bool is_invalid_reserved_pfn(unsigned long pfn
)
302 if (pfn_valid(pfn
)) {
304 struct page
*tail
= pfn_to_page(pfn
);
305 struct page
*head
= compound_head(tail
);
306 reserved
= !!(PageReserved(head
));
309 * "head" is not a dangling pointer
310 * (compound_head takes care of that)
311 * but the hugepage may have been split
312 * from under us (and we may not hold a
313 * reference count on the head page so it can
314 * be reused before we run PageReferenced), so
315 * we've to check PageTail before returning
322 return PageReserved(tail
);
328 static int put_pfn(unsigned long pfn
, int prot
)
330 if (!is_invalid_reserved_pfn(pfn
)) {
331 struct page
*page
= pfn_to_page(pfn
);
332 if (prot
& IOMMU_WRITE
)
340 static int vaddr_get_pfn(struct mm_struct
*mm
, unsigned long vaddr
,
341 int prot
, unsigned long *pfn
)
343 struct page
*page
[1];
344 struct vm_area_struct
*vma
;
345 struct vm_area_struct
*vmas
[1];
346 unsigned int flags
= 0;
349 if (prot
& IOMMU_WRITE
)
352 down_read(&mm
->mmap_sem
);
353 if (mm
== current
->mm
) {
354 ret
= get_user_pages_longterm(vaddr
, 1, flags
, page
, vmas
);
356 ret
= get_user_pages_remote(NULL
, mm
, vaddr
, 1, flags
, page
,
359 * The lifetime of a vaddr_get_pfn() page pin is
360 * userspace-controlled. In the fs-dax case this could
361 * lead to indefinite stalls in filesystem operations.
362 * Disallow attempts to pin fs-dax pages via this
365 if (ret
> 0 && vma_is_fsdax(vmas
[0])) {
370 up_read(&mm
->mmap_sem
);
373 *pfn
= page_to_pfn(page
[0]);
377 down_read(&mm
->mmap_sem
);
379 vma
= find_vma_intersection(mm
, vaddr
, vaddr
+ 1);
381 if (vma
&& vma
->vm_flags
& VM_PFNMAP
) {
382 *pfn
= ((vaddr
- vma
->vm_start
) >> PAGE_SHIFT
) + vma
->vm_pgoff
;
383 if (is_invalid_reserved_pfn(*pfn
))
387 up_read(&mm
->mmap_sem
);
392 * Attempt to pin pages. We really don't want to track all the pfns and
393 * the iommu can only map chunks of consecutive pfns anyway, so get the
394 * first page and all consecutive pages with the same locking.
396 static long vfio_pin_pages_remote(struct vfio_dma
*dma
, unsigned long vaddr
,
397 long npage
, unsigned long *pfn_base
,
400 unsigned long pfn
= 0;
401 long ret
, pinned
= 0, lock_acct
= 0;
403 dma_addr_t iova
= vaddr
- dma
->vaddr
+ dma
->iova
;
405 /* This code path is only user initiated */
409 ret
= vaddr_get_pfn(current
->mm
, vaddr
, dma
->prot
, pfn_base
);
414 rsvd
= is_invalid_reserved_pfn(*pfn_base
);
417 * Reserved pages aren't counted against the user, externally pinned
418 * pages are already counted against the user.
420 if (!rsvd
&& !vfio_find_vpfn(dma
, iova
)) {
421 if (!dma
->lock_cap
&& current
->mm
->locked_vm
+ 1 > limit
) {
422 put_pfn(*pfn_base
, dma
->prot
);
423 pr_warn("%s: RLIMIT_MEMLOCK (%ld) exceeded\n", __func__
,
424 limit
<< PAGE_SHIFT
);
430 if (unlikely(disable_hugepages
))
433 /* Lock all the consecutive pages from pfn_base */
434 for (vaddr
+= PAGE_SIZE
, iova
+= PAGE_SIZE
; pinned
< npage
;
435 pinned
++, vaddr
+= PAGE_SIZE
, iova
+= PAGE_SIZE
) {
436 ret
= vaddr_get_pfn(current
->mm
, vaddr
, dma
->prot
, &pfn
);
440 if (pfn
!= *pfn_base
+ pinned
||
441 rsvd
!= is_invalid_reserved_pfn(pfn
)) {
442 put_pfn(pfn
, dma
->prot
);
446 if (!rsvd
&& !vfio_find_vpfn(dma
, iova
)) {
447 if (!dma
->lock_cap
&&
448 current
->mm
->locked_vm
+ lock_acct
+ 1 > limit
) {
449 put_pfn(pfn
, dma
->prot
);
450 pr_warn("%s: RLIMIT_MEMLOCK (%ld) exceeded\n",
451 __func__
, limit
<< PAGE_SHIFT
);
460 ret
= vfio_lock_acct(dma
, lock_acct
, false);
465 for (pfn
= *pfn_base
; pinned
; pfn
++, pinned
--)
466 put_pfn(pfn
, dma
->prot
);
475 static long vfio_unpin_pages_remote(struct vfio_dma
*dma
, dma_addr_t iova
,
476 unsigned long pfn
, long npage
,
479 long unlocked
= 0, locked
= 0;
482 for (i
= 0; i
< npage
; i
++, iova
+= PAGE_SIZE
) {
483 if (put_pfn(pfn
++, dma
->prot
)) {
485 if (vfio_find_vpfn(dma
, iova
))
491 vfio_lock_acct(dma
, locked
- unlocked
, true);
496 static int vfio_pin_page_external(struct vfio_dma
*dma
, unsigned long vaddr
,
497 unsigned long *pfn_base
, bool do_accounting
)
499 struct mm_struct
*mm
;
502 mm
= get_task_mm(dma
->task
);
506 ret
= vaddr_get_pfn(mm
, vaddr
, dma
->prot
, pfn_base
);
507 if (!ret
&& do_accounting
&& !is_invalid_reserved_pfn(*pfn_base
)) {
508 ret
= vfio_lock_acct(dma
, 1, true);
510 put_pfn(*pfn_base
, dma
->prot
);
512 pr_warn("%s: Task %s (%d) RLIMIT_MEMLOCK "
513 "(%ld) exceeded\n", __func__
,
514 dma
->task
->comm
, task_pid_nr(dma
->task
),
515 task_rlimit(dma
->task
, RLIMIT_MEMLOCK
));
523 static int vfio_unpin_page_external(struct vfio_dma
*dma
, dma_addr_t iova
,
527 struct vfio_pfn
*vpfn
= vfio_find_vpfn(dma
, iova
);
532 unlocked
= vfio_iova_put_vfio_pfn(dma
, vpfn
);
535 vfio_lock_acct(dma
, -unlocked
, true);
540 static int vfio_iommu_type1_pin_pages(void *iommu_data
,
541 unsigned long *user_pfn
,
543 unsigned long *phys_pfn
)
545 struct vfio_iommu
*iommu
= iommu_data
;
547 unsigned long remote_vaddr
;
548 struct vfio_dma
*dma
;
551 if (!iommu
|| !user_pfn
|| !phys_pfn
)
554 /* Supported for v2 version only */
558 mutex_lock(&iommu
->lock
);
560 /* Fail if notifier list is empty */
561 if ((!iommu
->external_domain
) || (!iommu
->notifier
.head
)) {
567 * If iommu capable domain exist in the container then all pages are
568 * already pinned and accounted. Accouting should be done if there is no
569 * iommu capable domain in the container.
571 do_accounting
= !IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu
);
573 for (i
= 0; i
< npage
; i
++) {
575 struct vfio_pfn
*vpfn
;
577 iova
= user_pfn
[i
] << PAGE_SHIFT
;
578 dma
= vfio_find_dma(iommu
, iova
, PAGE_SIZE
);
584 if ((dma
->prot
& prot
) != prot
) {
589 vpfn
= vfio_iova_get_vfio_pfn(dma
, iova
);
591 phys_pfn
[i
] = vpfn
->pfn
;
595 remote_vaddr
= dma
->vaddr
+ iova
- dma
->iova
;
596 ret
= vfio_pin_page_external(dma
, remote_vaddr
, &phys_pfn
[i
],
601 ret
= vfio_add_to_pfn_list(dma
, iova
, phys_pfn
[i
]);
603 vfio_unpin_page_external(dma
, iova
, do_accounting
);
613 for (j
= 0; j
< i
; j
++) {
616 iova
= user_pfn
[j
] << PAGE_SHIFT
;
617 dma
= vfio_find_dma(iommu
, iova
, PAGE_SIZE
);
618 vfio_unpin_page_external(dma
, iova
, do_accounting
);
622 mutex_unlock(&iommu
->lock
);
626 static int vfio_iommu_type1_unpin_pages(void *iommu_data
,
627 unsigned long *user_pfn
,
630 struct vfio_iommu
*iommu
= iommu_data
;
634 if (!iommu
|| !user_pfn
)
637 /* Supported for v2 version only */
641 mutex_lock(&iommu
->lock
);
643 if (!iommu
->external_domain
) {
644 mutex_unlock(&iommu
->lock
);
648 do_accounting
= !IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu
);
649 for (i
= 0; i
< npage
; i
++) {
650 struct vfio_dma
*dma
;
653 iova
= user_pfn
[i
] << PAGE_SHIFT
;
654 dma
= vfio_find_dma(iommu
, iova
, PAGE_SIZE
);
657 vfio_unpin_page_external(dma
, iova
, do_accounting
);
661 mutex_unlock(&iommu
->lock
);
662 return i
> npage
? npage
: (i
> 0 ? i
: -EINVAL
);
665 static long vfio_sync_unpin(struct vfio_dma
*dma
, struct vfio_domain
*domain
,
666 struct list_head
*regions
)
669 struct vfio_regions
*entry
, *next
;
671 iommu_tlb_sync(domain
->domain
);
673 list_for_each_entry_safe(entry
, next
, regions
, list
) {
674 unlocked
+= vfio_unpin_pages_remote(dma
,
676 entry
->phys
>> PAGE_SHIFT
,
677 entry
->len
>> PAGE_SHIFT
,
679 list_del(&entry
->list
);
689 * Generally, VFIO needs to unpin remote pages after each IOTLB flush.
690 * Therefore, when using IOTLB flush sync interface, VFIO need to keep track
691 * of these regions (currently using a list).
693 * This value specifies maximum number of regions for each IOTLB flush sync.
695 #define VFIO_IOMMU_TLB_SYNC_MAX 512
697 static size_t unmap_unpin_fast(struct vfio_domain
*domain
,
698 struct vfio_dma
*dma
, dma_addr_t
*iova
,
699 size_t len
, phys_addr_t phys
, long *unlocked
,
700 struct list_head
*unmapped_list
,
704 struct vfio_regions
*entry
= kzalloc(sizeof(*entry
), GFP_KERNEL
);
707 unmapped
= iommu_unmap_fast(domain
->domain
, *iova
, len
);
712 iommu_tlb_range_add(domain
->domain
, *iova
, unmapped
);
715 entry
->len
= unmapped
;
716 list_add_tail(&entry
->list
, unmapped_list
);
724 * Sync if the number of fast-unmap regions hits the limit
725 * or in case of errors.
727 if (*unmapped_cnt
>= VFIO_IOMMU_TLB_SYNC_MAX
|| !unmapped
) {
728 *unlocked
+= vfio_sync_unpin(dma
, domain
,
736 static size_t unmap_unpin_slow(struct vfio_domain
*domain
,
737 struct vfio_dma
*dma
, dma_addr_t
*iova
,
738 size_t len
, phys_addr_t phys
,
741 size_t unmapped
= iommu_unmap(domain
->domain
, *iova
, len
);
744 *unlocked
+= vfio_unpin_pages_remote(dma
, *iova
,
746 unmapped
>> PAGE_SHIFT
,
754 static long vfio_unmap_unpin(struct vfio_iommu
*iommu
, struct vfio_dma
*dma
,
757 dma_addr_t iova
= dma
->iova
, end
= dma
->iova
+ dma
->size
;
758 struct vfio_domain
*domain
, *d
;
759 LIST_HEAD(unmapped_region_list
);
760 int unmapped_region_cnt
= 0;
766 if (!IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu
))
770 * We use the IOMMU to track the physical addresses, otherwise we'd
771 * need a much more complicated tracking system. Unfortunately that
772 * means we need to use one of the iommu domains to figure out the
773 * pfns to unpin. The rest need to be unmapped in advance so we have
774 * no iommu translations remaining when the pages are unpinned.
776 domain
= d
= list_first_entry(&iommu
->domain_list
,
777 struct vfio_domain
, next
);
779 list_for_each_entry_continue(d
, &iommu
->domain_list
, next
) {
780 iommu_unmap(d
->domain
, dma
->iova
, dma
->size
);
785 size_t unmapped
, len
;
786 phys_addr_t phys
, next
;
788 phys
= iommu_iova_to_phys(domain
->domain
, iova
);
789 if (WARN_ON(!phys
)) {
795 * To optimize for fewer iommu_unmap() calls, each of which
796 * may require hardware cache flushing, try to find the
797 * largest contiguous physical memory chunk to unmap.
799 for (len
= PAGE_SIZE
;
800 !domain
->fgsp
&& iova
+ len
< end
; len
+= PAGE_SIZE
) {
801 next
= iommu_iova_to_phys(domain
->domain
, iova
+ len
);
802 if (next
!= phys
+ len
)
807 * First, try to use fast unmap/unpin. In case of failure,
808 * switch to slow unmap/unpin path.
810 unmapped
= unmap_unpin_fast(domain
, dma
, &iova
, len
, phys
,
811 &unlocked
, &unmapped_region_list
,
812 &unmapped_region_cnt
);
814 unmapped
= unmap_unpin_slow(domain
, dma
, &iova
, len
,
816 if (WARN_ON(!unmapped
))
821 dma
->iommu_mapped
= false;
823 if (unmapped_region_cnt
)
824 unlocked
+= vfio_sync_unpin(dma
, domain
, &unmapped_region_list
);
827 vfio_lock_acct(dma
, -unlocked
, true);
833 static void vfio_remove_dma(struct vfio_iommu
*iommu
, struct vfio_dma
*dma
)
835 vfio_unmap_unpin(iommu
, dma
, true);
836 vfio_unlink_dma(iommu
, dma
);
837 put_task_struct(dma
->task
);
841 static unsigned long vfio_pgsize_bitmap(struct vfio_iommu
*iommu
)
843 struct vfio_domain
*domain
;
844 unsigned long bitmap
= ULONG_MAX
;
846 mutex_lock(&iommu
->lock
);
847 list_for_each_entry(domain
, &iommu
->domain_list
, next
)
848 bitmap
&= domain
->domain
->pgsize_bitmap
;
849 mutex_unlock(&iommu
->lock
);
852 * In case the IOMMU supports page sizes smaller than PAGE_SIZE
853 * we pretend PAGE_SIZE is supported and hide sub-PAGE_SIZE sizes.
854 * That way the user will be able to map/unmap buffers whose size/
855 * start address is aligned with PAGE_SIZE. Pinning code uses that
856 * granularity while iommu driver can use the sub-PAGE_SIZE size
859 if (bitmap
& ~PAGE_MASK
) {
867 static int vfio_dma_do_unmap(struct vfio_iommu
*iommu
,
868 struct vfio_iommu_type1_dma_unmap
*unmap
)
871 struct vfio_dma
*dma
, *dma_last
= NULL
;
873 int ret
= 0, retries
= 0;
875 mask
= ((uint64_t)1 << __ffs(vfio_pgsize_bitmap(iommu
))) - 1;
877 if (unmap
->iova
& mask
)
879 if (!unmap
->size
|| unmap
->size
& mask
)
881 if (unmap
->iova
+ unmap
->size
- 1 < unmap
->iova
||
882 unmap
->size
> SIZE_MAX
)
885 WARN_ON(mask
& PAGE_MASK
);
887 mutex_lock(&iommu
->lock
);
890 * vfio-iommu-type1 (v1) - User mappings were coalesced together to
891 * avoid tracking individual mappings. This means that the granularity
892 * of the original mapping was lost and the user was allowed to attempt
893 * to unmap any range. Depending on the contiguousness of physical
894 * memory and page sizes supported by the IOMMU, arbitrary unmaps may
895 * or may not have worked. We only guaranteed unmap granularity
896 * matching the original mapping; even though it was untracked here,
897 * the original mappings are reflected in IOMMU mappings. This
898 * resulted in a couple unusual behaviors. First, if a range is not
899 * able to be unmapped, ex. a set of 4k pages that was mapped as a
900 * 2M hugepage into the IOMMU, the unmap ioctl returns success but with
901 * a zero sized unmap. Also, if an unmap request overlaps the first
902 * address of a hugepage, the IOMMU will unmap the entire hugepage.
903 * This also returns success and the returned unmap size reflects the
904 * actual size unmapped.
906 * We attempt to maintain compatibility with this "v1" interface, but
907 * we take control out of the hands of the IOMMU. Therefore, an unmap
908 * request offset from the beginning of the original mapping will
909 * return success with zero sized unmap. And an unmap request covering
910 * the first iova of mapping will unmap the entire range.
912 * The v2 version of this interface intends to be more deterministic.
913 * Unmap requests must fully cover previous mappings. Multiple
914 * mappings may still be unmaped by specifying large ranges, but there
915 * must not be any previous mappings bisected by the range. An error
916 * will be returned if these conditions are not met. The v2 interface
917 * will only return success and a size of zero if there were no
918 * mappings within the range.
921 dma
= vfio_find_dma(iommu
, unmap
->iova
, 1);
922 if (dma
&& dma
->iova
!= unmap
->iova
) {
926 dma
= vfio_find_dma(iommu
, unmap
->iova
+ unmap
->size
- 1, 0);
927 if (dma
&& dma
->iova
+ dma
->size
!= unmap
->iova
+ unmap
->size
) {
933 while ((dma
= vfio_find_dma(iommu
, unmap
->iova
, unmap
->size
))) {
934 if (!iommu
->v2
&& unmap
->iova
> dma
->iova
)
937 * Task with same address space who mapped this iova range is
938 * allowed to unmap the iova range.
940 if (dma
->task
->mm
!= current
->mm
)
943 if (!RB_EMPTY_ROOT(&dma
->pfn_list
)) {
944 struct vfio_iommu_type1_dma_unmap nb_unmap
;
946 if (dma_last
== dma
) {
947 BUG_ON(++retries
> 10);
953 nb_unmap
.iova
= dma
->iova
;
954 nb_unmap
.size
= dma
->size
;
957 * Notify anyone (mdev vendor drivers) to invalidate and
958 * unmap iovas within the range we're about to unmap.
959 * Vendor drivers MUST unpin pages in response to an
962 mutex_unlock(&iommu
->lock
);
963 blocking_notifier_call_chain(&iommu
->notifier
,
964 VFIO_IOMMU_NOTIFY_DMA_UNMAP
,
968 unmapped
+= dma
->size
;
969 vfio_remove_dma(iommu
, dma
);
973 mutex_unlock(&iommu
->lock
);
975 /* Report how much was unmapped */
976 unmap
->size
= unmapped
;
981 static int vfio_iommu_map(struct vfio_iommu
*iommu
, dma_addr_t iova
,
982 unsigned long pfn
, long npage
, int prot
)
984 struct vfio_domain
*d
;
987 list_for_each_entry(d
, &iommu
->domain_list
, next
) {
988 ret
= iommu_map(d
->domain
, iova
, (phys_addr_t
)pfn
<< PAGE_SHIFT
,
989 npage
<< PAGE_SHIFT
, prot
| d
->prot
);
999 list_for_each_entry_continue_reverse(d
, &iommu
->domain_list
, next
)
1000 iommu_unmap(d
->domain
, iova
, npage
<< PAGE_SHIFT
);
1005 static int vfio_pin_map_dma(struct vfio_iommu
*iommu
, struct vfio_dma
*dma
,
1008 dma_addr_t iova
= dma
->iova
;
1009 unsigned long vaddr
= dma
->vaddr
;
1010 size_t size
= map_size
;
1012 unsigned long pfn
, limit
= rlimit(RLIMIT_MEMLOCK
) >> PAGE_SHIFT
;
1016 /* Pin a contiguous chunk of memory */
1017 npage
= vfio_pin_pages_remote(dma
, vaddr
+ dma
->size
,
1018 size
>> PAGE_SHIFT
, &pfn
, limit
);
1026 ret
= vfio_iommu_map(iommu
, iova
+ dma
->size
, pfn
, npage
,
1029 vfio_unpin_pages_remote(dma
, iova
+ dma
->size
, pfn
,
1034 size
-= npage
<< PAGE_SHIFT
;
1035 dma
->size
+= npage
<< PAGE_SHIFT
;
1038 dma
->iommu_mapped
= true;
1041 vfio_remove_dma(iommu
, dma
);
1046 static int vfio_dma_do_map(struct vfio_iommu
*iommu
,
1047 struct vfio_iommu_type1_dma_map
*map
)
1049 dma_addr_t iova
= map
->iova
;
1050 unsigned long vaddr
= map
->vaddr
;
1051 size_t size
= map
->size
;
1052 int ret
= 0, prot
= 0;
1054 struct vfio_dma
*dma
;
1056 /* Verify that none of our __u64 fields overflow */
1057 if (map
->size
!= size
|| map
->vaddr
!= vaddr
|| map
->iova
!= iova
)
1060 mask
= ((uint64_t)1 << __ffs(vfio_pgsize_bitmap(iommu
))) - 1;
1062 WARN_ON(mask
& PAGE_MASK
);
1064 /* READ/WRITE from device perspective */
1065 if (map
->flags
& VFIO_DMA_MAP_FLAG_WRITE
)
1066 prot
|= IOMMU_WRITE
;
1067 if (map
->flags
& VFIO_DMA_MAP_FLAG_READ
)
1070 if (!prot
|| !size
|| (size
| iova
| vaddr
) & mask
)
1073 /* Don't allow IOVA or virtual address wrap */
1074 if (iova
+ size
- 1 < iova
|| vaddr
+ size
- 1 < vaddr
)
1077 mutex_lock(&iommu
->lock
);
1079 if (vfio_find_dma(iommu
, iova
, size
)) {
1084 dma
= kzalloc(sizeof(*dma
), GFP_KERNEL
);
1095 * We need to be able to both add to a task's locked memory and test
1096 * against the locked memory limit and we need to be able to do both
1097 * outside of this call path as pinning can be asynchronous via the
1098 * external interfaces for mdev devices. RLIMIT_MEMLOCK requires a
1099 * task_struct and VM locked pages requires an mm_struct, however
1100 * holding an indefinite mm reference is not recommended, therefore we
1101 * only hold a reference to a task. We could hold a reference to
1102 * current, however QEMU uses this call path through vCPU threads,
1103 * which can be killed resulting in a NULL mm and failure in the unmap
1104 * path when called via a different thread. Avoid this problem by
1105 * using the group_leader as threads within the same group require
1106 * both CLONE_THREAD and CLONE_VM and will therefore use the same
1109 * Previously we also used the task for testing CAP_IPC_LOCK at the
1110 * time of pinning and accounting, however has_capability() makes use
1111 * of real_cred, a copy-on-write field, so we can't guarantee that it
1112 * matches group_leader, or in fact that it might not change by the
1113 * time it's evaluated. If a process were to call MAP_DMA with
1114 * CAP_IPC_LOCK but later drop it, it doesn't make sense that they
1115 * possibly see different results for an iommu_mapped vfio_dma vs
1116 * externally mapped. Therefore track CAP_IPC_LOCK in vfio_dma at the
1117 * time of calling MAP_DMA.
1119 get_task_struct(current
->group_leader
);
1120 dma
->task
= current
->group_leader
;
1121 dma
->lock_cap
= capable(CAP_IPC_LOCK
);
1123 dma
->pfn_list
= RB_ROOT
;
1125 /* Insert zero-sized and grow as we map chunks of it */
1126 vfio_link_dma(iommu
, dma
);
1128 /* Don't pin and map if container doesn't contain IOMMU capable domain*/
1129 if (!IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu
))
1132 ret
= vfio_pin_map_dma(iommu
, dma
, size
);
1135 mutex_unlock(&iommu
->lock
);
1139 static int vfio_bus_type(struct device
*dev
, void *data
)
1141 struct bus_type
**bus
= data
;
1143 if (*bus
&& *bus
!= dev
->bus
)
1151 static int vfio_iommu_replay(struct vfio_iommu
*iommu
,
1152 struct vfio_domain
*domain
)
1154 struct vfio_domain
*d
;
1156 unsigned long limit
= rlimit(RLIMIT_MEMLOCK
) >> PAGE_SHIFT
;
1159 /* Arbitrarily pick the first domain in the list for lookups */
1160 d
= list_first_entry(&iommu
->domain_list
, struct vfio_domain
, next
);
1161 n
= rb_first(&iommu
->dma_list
);
1163 for (; n
; n
= rb_next(n
)) {
1164 struct vfio_dma
*dma
;
1167 dma
= rb_entry(n
, struct vfio_dma
, node
);
1170 while (iova
< dma
->iova
+ dma
->size
) {
1174 if (dma
->iommu_mapped
) {
1178 phys
= iommu_iova_to_phys(d
->domain
, iova
);
1180 if (WARN_ON(!phys
)) {
1188 while (i
< dma
->iova
+ dma
->size
&&
1189 p
== iommu_iova_to_phys(d
->domain
, i
)) {
1196 unsigned long vaddr
= dma
->vaddr
+
1198 size_t n
= dma
->iova
+ dma
->size
- iova
;
1201 npage
= vfio_pin_pages_remote(dma
, vaddr
,
1210 phys
= pfn
<< PAGE_SHIFT
;
1211 size
= npage
<< PAGE_SHIFT
;
1214 ret
= iommu_map(domain
->domain
, iova
, phys
,
1215 size
, dma
->prot
| domain
->prot
);
1221 dma
->iommu_mapped
= true;
1227 * We change our unmap behavior slightly depending on whether the IOMMU
1228 * supports fine-grained superpages. IOMMUs like AMD-Vi will use a superpage
1229 * for practically any contiguous power-of-two mapping we give it. This means
1230 * we don't need to look for contiguous chunks ourselves to make unmapping
1231 * more efficient. On IOMMUs with coarse-grained super pages, like Intel VT-d
1232 * with discrete 2M/1G/512G/1T superpages, identifying contiguous chunks
1233 * significantly boosts non-hugetlbfs mappings and doesn't seem to hurt when
1234 * hugetlbfs is in use.
1236 static void vfio_test_domain_fgsp(struct vfio_domain
*domain
)
1239 int ret
, order
= get_order(PAGE_SIZE
* 2);
1241 pages
= alloc_pages(GFP_KERNEL
| __GFP_ZERO
, order
);
1245 ret
= iommu_map(domain
->domain
, 0, page_to_phys(pages
), PAGE_SIZE
* 2,
1246 IOMMU_READ
| IOMMU_WRITE
| domain
->prot
);
1248 size_t unmapped
= iommu_unmap(domain
->domain
, 0, PAGE_SIZE
);
1250 if (unmapped
== PAGE_SIZE
)
1251 iommu_unmap(domain
->domain
, PAGE_SIZE
, PAGE_SIZE
);
1253 domain
->fgsp
= true;
1256 __free_pages(pages
, order
);
1259 static struct vfio_group
*find_iommu_group(struct vfio_domain
*domain
,
1260 struct iommu_group
*iommu_group
)
1262 struct vfio_group
*g
;
1264 list_for_each_entry(g
, &domain
->group_list
, next
) {
1265 if (g
->iommu_group
== iommu_group
)
1272 static bool vfio_iommu_has_sw_msi(struct iommu_group
*group
, phys_addr_t
*base
)
1274 struct list_head group_resv_regions
;
1275 struct iommu_resv_region
*region
, *next
;
1278 INIT_LIST_HEAD(&group_resv_regions
);
1279 iommu_get_group_resv_regions(group
, &group_resv_regions
);
1280 list_for_each_entry(region
, &group_resv_regions
, list
) {
1282 * The presence of any 'real' MSI regions should take
1283 * precedence over the software-managed one if the
1284 * IOMMU driver happens to advertise both types.
1286 if (region
->type
== IOMMU_RESV_MSI
) {
1291 if (region
->type
== IOMMU_RESV_SW_MSI
) {
1292 *base
= region
->start
;
1296 list_for_each_entry_safe(region
, next
, &group_resv_regions
, list
)
1301 static int vfio_iommu_type1_attach_group(void *iommu_data
,
1302 struct iommu_group
*iommu_group
)
1304 struct vfio_iommu
*iommu
= iommu_data
;
1305 struct vfio_group
*group
;
1306 struct vfio_domain
*domain
, *d
;
1307 struct bus_type
*bus
= NULL
, *mdev_bus
;
1309 bool resv_msi
, msi_remap
;
1310 phys_addr_t resv_msi_base
;
1312 mutex_lock(&iommu
->lock
);
1314 list_for_each_entry(d
, &iommu
->domain_list
, next
) {
1315 if (find_iommu_group(d
, iommu_group
)) {
1316 mutex_unlock(&iommu
->lock
);
1321 if (iommu
->external_domain
) {
1322 if (find_iommu_group(iommu
->external_domain
, iommu_group
)) {
1323 mutex_unlock(&iommu
->lock
);
1328 group
= kzalloc(sizeof(*group
), GFP_KERNEL
);
1329 domain
= kzalloc(sizeof(*domain
), GFP_KERNEL
);
1330 if (!group
|| !domain
) {
1335 group
->iommu_group
= iommu_group
;
1337 /* Determine bus_type in order to allocate a domain */
1338 ret
= iommu_group_for_each_dev(iommu_group
, &bus
, vfio_bus_type
);
1342 mdev_bus
= symbol_get(mdev_bus_type
);
1345 if ((bus
== mdev_bus
) && !iommu_present(bus
)) {
1346 symbol_put(mdev_bus_type
);
1347 if (!iommu
->external_domain
) {
1348 INIT_LIST_HEAD(&domain
->group_list
);
1349 iommu
->external_domain
= domain
;
1353 list_add(&group
->next
,
1354 &iommu
->external_domain
->group_list
);
1355 mutex_unlock(&iommu
->lock
);
1358 symbol_put(mdev_bus_type
);
1361 domain
->domain
= iommu_domain_alloc(bus
);
1362 if (!domain
->domain
) {
1367 if (iommu
->nesting
) {
1370 ret
= iommu_domain_set_attr(domain
->domain
, DOMAIN_ATTR_NESTING
,
1376 ret
= iommu_attach_group(domain
->domain
, iommu_group
);
1380 resv_msi
= vfio_iommu_has_sw_msi(iommu_group
, &resv_msi_base
);
1382 INIT_LIST_HEAD(&domain
->group_list
);
1383 list_add(&group
->next
, &domain
->group_list
);
1385 msi_remap
= irq_domain_check_msi_remap() ||
1386 iommu_capable(bus
, IOMMU_CAP_INTR_REMAP
);
1388 if (!allow_unsafe_interrupts
&& !msi_remap
) {
1389 pr_warn("%s: No interrupt remapping support. Use the module param \"allow_unsafe_interrupts\" to enable VFIO IOMMU support on this platform\n",
1395 if (iommu_capable(bus
, IOMMU_CAP_CACHE_COHERENCY
))
1396 domain
->prot
|= IOMMU_CACHE
;
1399 * Try to match an existing compatible domain. We don't want to
1400 * preclude an IOMMU driver supporting multiple bus_types and being
1401 * able to include different bus_types in the same IOMMU domain, so
1402 * we test whether the domains use the same iommu_ops rather than
1403 * testing if they're on the same bus_type.
1405 list_for_each_entry(d
, &iommu
->domain_list
, next
) {
1406 if (d
->domain
->ops
== domain
->domain
->ops
&&
1407 d
->prot
== domain
->prot
) {
1408 iommu_detach_group(domain
->domain
, iommu_group
);
1409 if (!iommu_attach_group(d
->domain
, iommu_group
)) {
1410 list_add(&group
->next
, &d
->group_list
);
1411 iommu_domain_free(domain
->domain
);
1413 mutex_unlock(&iommu
->lock
);
1417 ret
= iommu_attach_group(domain
->domain
, iommu_group
);
1423 vfio_test_domain_fgsp(domain
);
1425 /* replay mappings on new domains */
1426 ret
= vfio_iommu_replay(iommu
, domain
);
1431 ret
= iommu_get_msi_cookie(domain
->domain
, resv_msi_base
);
1436 list_add(&domain
->next
, &iommu
->domain_list
);
1438 mutex_unlock(&iommu
->lock
);
1443 iommu_detach_group(domain
->domain
, iommu_group
);
1445 iommu_domain_free(domain
->domain
);
1449 mutex_unlock(&iommu
->lock
);
1453 static void vfio_iommu_unmap_unpin_all(struct vfio_iommu
*iommu
)
1455 struct rb_node
*node
;
1457 while ((node
= rb_first(&iommu
->dma_list
)))
1458 vfio_remove_dma(iommu
, rb_entry(node
, struct vfio_dma
, node
));
1461 static void vfio_iommu_unmap_unpin_reaccount(struct vfio_iommu
*iommu
)
1463 struct rb_node
*n
, *p
;
1465 n
= rb_first(&iommu
->dma_list
);
1466 for (; n
; n
= rb_next(n
)) {
1467 struct vfio_dma
*dma
;
1468 long locked
= 0, unlocked
= 0;
1470 dma
= rb_entry(n
, struct vfio_dma
, node
);
1471 unlocked
+= vfio_unmap_unpin(iommu
, dma
, false);
1472 p
= rb_first(&dma
->pfn_list
);
1473 for (; p
; p
= rb_next(p
)) {
1474 struct vfio_pfn
*vpfn
= rb_entry(p
, struct vfio_pfn
,
1477 if (!is_invalid_reserved_pfn(vpfn
->pfn
))
1480 vfio_lock_acct(dma
, locked
- unlocked
, true);
1484 static void vfio_sanity_check_pfn_list(struct vfio_iommu
*iommu
)
1488 n
= rb_first(&iommu
->dma_list
);
1489 for (; n
; n
= rb_next(n
)) {
1490 struct vfio_dma
*dma
;
1492 dma
= rb_entry(n
, struct vfio_dma
, node
);
1494 if (WARN_ON(!RB_EMPTY_ROOT(&dma
->pfn_list
)))
1497 /* mdev vendor driver must unregister notifier */
1498 WARN_ON(iommu
->notifier
.head
);
1501 static void vfio_iommu_type1_detach_group(void *iommu_data
,
1502 struct iommu_group
*iommu_group
)
1504 struct vfio_iommu
*iommu
= iommu_data
;
1505 struct vfio_domain
*domain
;
1506 struct vfio_group
*group
;
1508 mutex_lock(&iommu
->lock
);
1510 if (iommu
->external_domain
) {
1511 group
= find_iommu_group(iommu
->external_domain
, iommu_group
);
1513 list_del(&group
->next
);
1516 if (list_empty(&iommu
->external_domain
->group_list
)) {
1517 vfio_sanity_check_pfn_list(iommu
);
1519 if (!IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu
))
1520 vfio_iommu_unmap_unpin_all(iommu
);
1522 kfree(iommu
->external_domain
);
1523 iommu
->external_domain
= NULL
;
1525 goto detach_group_done
;
1529 list_for_each_entry(domain
, &iommu
->domain_list
, next
) {
1530 group
= find_iommu_group(domain
, iommu_group
);
1534 iommu_detach_group(domain
->domain
, iommu_group
);
1535 list_del(&group
->next
);
1538 * Group ownership provides privilege, if the group list is
1539 * empty, the domain goes away. If it's the last domain with
1540 * iommu and external domain doesn't exist, then all the
1541 * mappings go away too. If it's the last domain with iommu and
1542 * external domain exist, update accounting
1544 if (list_empty(&domain
->group_list
)) {
1545 if (list_is_singular(&iommu
->domain_list
)) {
1546 if (!iommu
->external_domain
)
1547 vfio_iommu_unmap_unpin_all(iommu
);
1549 vfio_iommu_unmap_unpin_reaccount(iommu
);
1551 iommu_domain_free(domain
->domain
);
1552 list_del(&domain
->next
);
1559 mutex_unlock(&iommu
->lock
);
1562 static void *vfio_iommu_type1_open(unsigned long arg
)
1564 struct vfio_iommu
*iommu
;
1566 iommu
= kzalloc(sizeof(*iommu
), GFP_KERNEL
);
1568 return ERR_PTR(-ENOMEM
);
1571 case VFIO_TYPE1_IOMMU
:
1573 case VFIO_TYPE1_NESTING_IOMMU
:
1574 iommu
->nesting
= true;
1576 case VFIO_TYPE1v2_IOMMU
:
1581 return ERR_PTR(-EINVAL
);
1584 INIT_LIST_HEAD(&iommu
->domain_list
);
1585 iommu
->dma_list
= RB_ROOT
;
1586 mutex_init(&iommu
->lock
);
1587 BLOCKING_INIT_NOTIFIER_HEAD(&iommu
->notifier
);
1592 static void vfio_release_domain(struct vfio_domain
*domain
, bool external
)
1594 struct vfio_group
*group
, *group_tmp
;
1596 list_for_each_entry_safe(group
, group_tmp
,
1597 &domain
->group_list
, next
) {
1599 iommu_detach_group(domain
->domain
, group
->iommu_group
);
1600 list_del(&group
->next
);
1605 iommu_domain_free(domain
->domain
);
1608 static void vfio_iommu_type1_release(void *iommu_data
)
1610 struct vfio_iommu
*iommu
= iommu_data
;
1611 struct vfio_domain
*domain
, *domain_tmp
;
1613 if (iommu
->external_domain
) {
1614 vfio_release_domain(iommu
->external_domain
, true);
1615 vfio_sanity_check_pfn_list(iommu
);
1616 kfree(iommu
->external_domain
);
1619 vfio_iommu_unmap_unpin_all(iommu
);
1621 list_for_each_entry_safe(domain
, domain_tmp
,
1622 &iommu
->domain_list
, next
) {
1623 vfio_release_domain(domain
, false);
1624 list_del(&domain
->next
);
1630 static int vfio_domains_have_iommu_cache(struct vfio_iommu
*iommu
)
1632 struct vfio_domain
*domain
;
1635 mutex_lock(&iommu
->lock
);
1636 list_for_each_entry(domain
, &iommu
->domain_list
, next
) {
1637 if (!(domain
->prot
& IOMMU_CACHE
)) {
1642 mutex_unlock(&iommu
->lock
);
1647 static long vfio_iommu_type1_ioctl(void *iommu_data
,
1648 unsigned int cmd
, unsigned long arg
)
1650 struct vfio_iommu
*iommu
= iommu_data
;
1651 unsigned long minsz
;
1653 if (cmd
== VFIO_CHECK_EXTENSION
) {
1655 case VFIO_TYPE1_IOMMU
:
1656 case VFIO_TYPE1v2_IOMMU
:
1657 case VFIO_TYPE1_NESTING_IOMMU
:
1659 case VFIO_DMA_CC_IOMMU
:
1662 return vfio_domains_have_iommu_cache(iommu
);
1666 } else if (cmd
== VFIO_IOMMU_GET_INFO
) {
1667 struct vfio_iommu_type1_info info
;
1669 minsz
= offsetofend(struct vfio_iommu_type1_info
, iova_pgsizes
);
1671 if (copy_from_user(&info
, (void __user
*)arg
, minsz
))
1674 if (info
.argsz
< minsz
)
1677 info
.flags
= VFIO_IOMMU_INFO_PGSIZES
;
1679 info
.iova_pgsizes
= vfio_pgsize_bitmap(iommu
);
1681 return copy_to_user((void __user
*)arg
, &info
, minsz
) ?
1684 } else if (cmd
== VFIO_IOMMU_MAP_DMA
) {
1685 struct vfio_iommu_type1_dma_map map
;
1686 uint32_t mask
= VFIO_DMA_MAP_FLAG_READ
|
1687 VFIO_DMA_MAP_FLAG_WRITE
;
1689 minsz
= offsetofend(struct vfio_iommu_type1_dma_map
, size
);
1691 if (copy_from_user(&map
, (void __user
*)arg
, minsz
))
1694 if (map
.argsz
< minsz
|| map
.flags
& ~mask
)
1697 return vfio_dma_do_map(iommu
, &map
);
1699 } else if (cmd
== VFIO_IOMMU_UNMAP_DMA
) {
1700 struct vfio_iommu_type1_dma_unmap unmap
;
1703 minsz
= offsetofend(struct vfio_iommu_type1_dma_unmap
, size
);
1705 if (copy_from_user(&unmap
, (void __user
*)arg
, minsz
))
1708 if (unmap
.argsz
< minsz
|| unmap
.flags
)
1711 ret
= vfio_dma_do_unmap(iommu
, &unmap
);
1715 return copy_to_user((void __user
*)arg
, &unmap
, minsz
) ?
1722 static int vfio_iommu_type1_register_notifier(void *iommu_data
,
1723 unsigned long *events
,
1724 struct notifier_block
*nb
)
1726 struct vfio_iommu
*iommu
= iommu_data
;
1728 /* clear known events */
1729 *events
&= ~VFIO_IOMMU_NOTIFY_DMA_UNMAP
;
1731 /* refuse to register if still events remaining */
1735 return blocking_notifier_chain_register(&iommu
->notifier
, nb
);
1738 static int vfio_iommu_type1_unregister_notifier(void *iommu_data
,
1739 struct notifier_block
*nb
)
1741 struct vfio_iommu
*iommu
= iommu_data
;
1743 return blocking_notifier_chain_unregister(&iommu
->notifier
, nb
);
1746 static const struct vfio_iommu_driver_ops vfio_iommu_driver_ops_type1
= {
1747 .name
= "vfio-iommu-type1",
1748 .owner
= THIS_MODULE
,
1749 .open
= vfio_iommu_type1_open
,
1750 .release
= vfio_iommu_type1_release
,
1751 .ioctl
= vfio_iommu_type1_ioctl
,
1752 .attach_group
= vfio_iommu_type1_attach_group
,
1753 .detach_group
= vfio_iommu_type1_detach_group
,
1754 .pin_pages
= vfio_iommu_type1_pin_pages
,
1755 .unpin_pages
= vfio_iommu_type1_unpin_pages
,
1756 .register_notifier
= vfio_iommu_type1_register_notifier
,
1757 .unregister_notifier
= vfio_iommu_type1_unregister_notifier
,
1760 static int __init
vfio_iommu_type1_init(void)
1762 return vfio_register_iommu_driver(&vfio_iommu_driver_ops_type1
);
1765 static void __exit
vfio_iommu_type1_cleanup(void)
1767 vfio_unregister_iommu_driver(&vfio_iommu_driver_ops_type1
);
1770 module_init(vfio_iommu_type1_init
);
1771 module_exit(vfio_iommu_type1_cleanup
);
1773 MODULE_VERSION(DRIVER_VERSION
);
1774 MODULE_LICENSE("GPL v2");
1775 MODULE_AUTHOR(DRIVER_AUTHOR
);
1776 MODULE_DESCRIPTION(DRIVER_DESC
);