1
2
3
4
5
6
7
8
9#include <linux/types.h>
10#include <linux/string.h>
11#include <linux/kvm.h>
12#include <linux/kvm_host.h>
13#include <linux/highmem.h>
14#include <linux/gfp.h>
15#include <linux/slab.h>
16#include <linux/sched/signal.h>
17#include <linux/hugetlb.h>
18#include <linux/list.h>
19#include <linux/anon_inodes.h>
20#include <linux/iommu.h>
21#include <linux/file.h>
22#include <linux/mm.h>
23
24#include <asm/kvm_ppc.h>
25#include <asm/kvm_book3s.h>
26#include <asm/book3s/64/mmu-hash.h>
27#include <asm/hvcall.h>
28#include <asm/synch.h>
29#include <asm/ppc-opcode.h>
30#include <asm/udbg.h>
31#include <asm/iommu.h>
32#include <asm/tce.h>
33#include <asm/mmu_context.h>
34
35static unsigned long kvmppc_tce_pages(unsigned long iommu_pages)
36{
37 return ALIGN(iommu_pages * sizeof(u64), PAGE_SIZE) / PAGE_SIZE;
38}
39
40static unsigned long kvmppc_stt_pages(unsigned long tce_pages)
41{
42 unsigned long stt_bytes = sizeof(struct kvmppc_spapr_tce_table) +
43 (tce_pages * sizeof(struct page *));
44
45 return tce_pages + ALIGN(stt_bytes, PAGE_SIZE) / PAGE_SIZE;
46}
47
48static void kvm_spapr_tce_iommu_table_free(struct rcu_head *head)
49{
50 struct kvmppc_spapr_tce_iommu_table *stit = container_of(head,
51 struct kvmppc_spapr_tce_iommu_table, rcu);
52
53 iommu_tce_table_put(stit->tbl);
54
55 kfree(stit);
56}
57
58static void kvm_spapr_tce_liobn_put(struct kref *kref)
59{
60 struct kvmppc_spapr_tce_iommu_table *stit = container_of(kref,
61 struct kvmppc_spapr_tce_iommu_table, kref);
62
63 list_del_rcu(&stit->next);
64
65 call_rcu(&stit->rcu, kvm_spapr_tce_iommu_table_free);
66}
67
68extern void kvm_spapr_tce_release_iommu_group(struct kvm *kvm,
69 struct iommu_group *grp)
70{
71 int i;
72 struct kvmppc_spapr_tce_table *stt;
73 struct kvmppc_spapr_tce_iommu_table *stit, *tmp;
74 struct iommu_table_group *table_group = NULL;
75
76 rcu_read_lock();
77 list_for_each_entry_rcu(stt, &kvm->arch.spapr_tce_tables, list) {
78
79 table_group = iommu_group_get_iommudata(grp);
80 if (WARN_ON(!table_group))
81 continue;
82
83 list_for_each_entry_safe(stit, tmp, &stt->iommu_tables, next) {
84 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
85 if (table_group->tables[i] != stit->tbl)
86 continue;
87
88 kref_put(&stit->kref, kvm_spapr_tce_liobn_put);
89 }
90 }
91 cond_resched_rcu();
92 }
93 rcu_read_unlock();
94}
95
96extern long kvm_spapr_tce_attach_iommu_group(struct kvm *kvm, int tablefd,
97 struct iommu_group *grp)
98{
99 struct kvmppc_spapr_tce_table *stt = NULL;
100 bool found = false;
101 struct iommu_table *tbl = NULL;
102 struct iommu_table_group *table_group;
103 long i;
104 struct kvmppc_spapr_tce_iommu_table *stit;
105 struct fd f;
106
107 f = fdget(tablefd);
108 if (!f.file)
109 return -EBADF;
110
111 rcu_read_lock();
112 list_for_each_entry_rcu(stt, &kvm->arch.spapr_tce_tables, list) {
113 if (stt == f.file->private_data) {
114 found = true;
115 break;
116 }
117 }
118 rcu_read_unlock();
119
120 fdput(f);
121
122 if (!found)
123 return -EINVAL;
124
125 table_group = iommu_group_get_iommudata(grp);
126 if (WARN_ON(!table_group))
127 return -EFAULT;
128
129 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
130 struct iommu_table *tbltmp = table_group->tables[i];
131
132 if (!tbltmp)
133 continue;
134
135 if ((tbltmp->it_page_shift <= stt->page_shift) &&
136 (tbltmp->it_offset << tbltmp->it_page_shift ==
137 stt->offset << stt->page_shift) &&
138 (tbltmp->it_size << tbltmp->it_page_shift >=
139 stt->size << stt->page_shift)) {
140
141
142
143
144 tbl = iommu_tce_table_get(tbltmp);
145 break;
146 }
147 }
148 if (!tbl)
149 return -EINVAL;
150
151 rcu_read_lock();
152 list_for_each_entry_rcu(stit, &stt->iommu_tables, next) {
153 if (tbl != stit->tbl)
154 continue;
155
156 if (!kref_get_unless_zero(&stit->kref)) {
157
158 iommu_tce_table_put(tbl);
159 rcu_read_unlock();
160 return -ENOTTY;
161 }
162
163
164
165
166 rcu_read_unlock();
167 return 0;
168 }
169 rcu_read_unlock();
170
171 stit = kzalloc(sizeof(*stit), GFP_KERNEL);
172 if (!stit) {
173 iommu_tce_table_put(tbl);
174 return -ENOMEM;
175 }
176
177 stit->tbl = tbl;
178 kref_init(&stit->kref);
179
180 list_add_rcu(&stit->next, &stt->iommu_tables);
181
182 return 0;
183}
184
185static void release_spapr_tce_table(struct rcu_head *head)
186{
187 struct kvmppc_spapr_tce_table *stt = container_of(head,
188 struct kvmppc_spapr_tce_table, rcu);
189 unsigned long i, npages = kvmppc_tce_pages(stt->size);
190
191 for (i = 0; i < npages; i++)
192 if (stt->pages[i])
193 __free_page(stt->pages[i]);
194
195 kfree(stt);
196}
197
198static struct page *kvm_spapr_get_tce_page(struct kvmppc_spapr_tce_table *stt,
199 unsigned long sttpage)
200{
201 struct page *page = stt->pages[sttpage];
202
203 if (page)
204 return page;
205
206 mutex_lock(&stt->alloc_lock);
207 page = stt->pages[sttpage];
208 if (!page) {
209 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
210 WARN_ON_ONCE(!page);
211 if (page)
212 stt->pages[sttpage] = page;
213 }
214 mutex_unlock(&stt->alloc_lock);
215
216 return page;
217}
218
219static vm_fault_t kvm_spapr_tce_fault(struct vm_fault *vmf)
220{
221 struct kvmppc_spapr_tce_table *stt = vmf->vma->vm_file->private_data;
222 struct page *page;
223
224 if (vmf->pgoff >= kvmppc_tce_pages(stt->size))
225 return VM_FAULT_SIGBUS;
226
227 page = kvm_spapr_get_tce_page(stt, vmf->pgoff);
228 if (!page)
229 return VM_FAULT_OOM;
230
231 get_page(page);
232 vmf->page = page;
233 return 0;
234}
235
236static const struct vm_operations_struct kvm_spapr_tce_vm_ops = {
237 .fault = kvm_spapr_tce_fault,
238};
239
240static int kvm_spapr_tce_mmap(struct file *file, struct vm_area_struct *vma)
241{
242 vma->vm_ops = &kvm_spapr_tce_vm_ops;
243 return 0;
244}
245
246static int kvm_spapr_tce_release(struct inode *inode, struct file *filp)
247{
248 struct kvmppc_spapr_tce_table *stt = filp->private_data;
249 struct kvmppc_spapr_tce_iommu_table *stit, *tmp;
250 struct kvm *kvm = stt->kvm;
251
252 mutex_lock(&kvm->lock);
253 list_del_rcu(&stt->list);
254 mutex_unlock(&kvm->lock);
255
256 list_for_each_entry_safe(stit, tmp, &stt->iommu_tables, next) {
257 WARN_ON(!kref_read(&stit->kref));
258 while (1) {
259 if (kref_put(&stit->kref, kvm_spapr_tce_liobn_put))
260 break;
261 }
262 }
263
264 account_locked_vm(kvm->mm,
265 kvmppc_stt_pages(kvmppc_tce_pages(stt->size)), false);
266
267 kvm_put_kvm(stt->kvm);
268
269 call_rcu(&stt->rcu, release_spapr_tce_table);
270
271 return 0;
272}
273
274static const struct file_operations kvm_spapr_tce_fops = {
275 .mmap = kvm_spapr_tce_mmap,
276 .release = kvm_spapr_tce_release,
277};
278
279long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
280 struct kvm_create_spapr_tce_64 *args)
281{
282 struct kvmppc_spapr_tce_table *stt = NULL;
283 struct kvmppc_spapr_tce_table *siter;
284 struct mm_struct *mm = kvm->mm;
285 unsigned long npages, size = args->size;
286 int ret;
287
288 if (!args->size || args->page_shift < 12 || args->page_shift > 34 ||
289 (args->offset + args->size > (ULLONG_MAX >> args->page_shift)))
290 return -EINVAL;
291
292 npages = kvmppc_tce_pages(size);
293 ret = account_locked_vm(mm, kvmppc_stt_pages(npages), true);
294 if (ret)
295 return ret;
296
297 ret = -ENOMEM;
298 stt = kzalloc(sizeof(*stt) + npages * sizeof(struct page *),
299 GFP_KERNEL);
300 if (!stt)
301 goto fail_acct;
302
303 stt->liobn = args->liobn;
304 stt->page_shift = args->page_shift;
305 stt->offset = args->offset;
306 stt->size = size;
307 stt->kvm = kvm;
308 mutex_init(&stt->alloc_lock);
309 INIT_LIST_HEAD_RCU(&stt->iommu_tables);
310
311 mutex_lock(&kvm->lock);
312
313
314 ret = 0;
315 list_for_each_entry(siter, &kvm->arch.spapr_tce_tables, list) {
316 if (siter->liobn == args->liobn) {
317 ret = -EBUSY;
318 break;
319 }
320 }
321
322 kvm_get_kvm(kvm);
323 if (!ret)
324 ret = anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops,
325 stt, O_RDWR | O_CLOEXEC);
326
327 if (ret >= 0)
328 list_add_rcu(&stt->list, &kvm->arch.spapr_tce_tables);
329 else
330 kvm_put_kvm_no_destroy(kvm);
331
332 mutex_unlock(&kvm->lock);
333
334 if (ret >= 0)
335 return ret;
336
337 kfree(stt);
338 fail_acct:
339 account_locked_vm(mm, kvmppc_stt_pages(npages), false);
340 return ret;
341}
342
343static long kvmppc_tce_to_ua(struct kvm *kvm, unsigned long tce,
344 unsigned long *ua)
345{
346 unsigned long gfn = tce >> PAGE_SHIFT;
347 struct kvm_memory_slot *memslot;
348
349 memslot = __gfn_to_memslot(kvm_memslots(kvm), gfn);
350 if (!memslot)
351 return -EINVAL;
352
353 *ua = __gfn_to_hva_memslot(memslot, gfn) |
354 (tce & ~(PAGE_MASK | TCE_PCI_READ | TCE_PCI_WRITE));
355
356 return 0;
357}
358
359static long kvmppc_tce_validate(struct kvmppc_spapr_tce_table *stt,
360 unsigned long tce)
361{
362 unsigned long gpa = tce & ~(TCE_PCI_READ | TCE_PCI_WRITE);
363 enum dma_data_direction dir = iommu_tce_direction(tce);
364 struct kvmppc_spapr_tce_iommu_table *stit;
365 unsigned long ua = 0;
366
367
368 if (dir == DMA_NONE)
369 return H_SUCCESS;
370
371 if (iommu_tce_check_gpa(stt->page_shift, gpa))
372 return H_TOO_HARD;
373
374 if (kvmppc_tce_to_ua(stt->kvm, tce, &ua))
375 return H_TOO_HARD;
376
377 rcu_read_lock();
378 list_for_each_entry_rcu(stit, &stt->iommu_tables, next) {
379 unsigned long hpa = 0;
380 struct mm_iommu_table_group_mem_t *mem;
381 long shift = stit->tbl->it_page_shift;
382
383 mem = mm_iommu_lookup(stt->kvm->mm, ua, 1ULL << shift);
384 if (!mem || mm_iommu_ua_to_hpa(mem, ua, shift, &hpa)) {
385 rcu_read_unlock();
386 return H_TOO_HARD;
387 }
388 }
389 rcu_read_unlock();
390
391 return H_SUCCESS;
392}
393
394
395
396
397
398
399static void kvmppc_tce_put(struct kvmppc_spapr_tce_table *stt,
400 unsigned long idx, unsigned long tce)
401{
402 struct page *page;
403 u64 *tbl;
404 unsigned long sttpage;
405
406 idx -= stt->offset;
407 sttpage = idx / TCES_PER_PAGE;
408 page = stt->pages[sttpage];
409
410 if (!page) {
411
412 if (!tce)
413 return;
414
415 page = kvm_spapr_get_tce_page(stt, sttpage);
416 if (!page)
417 return;
418 }
419 tbl = page_to_virt(page);
420
421 tbl[idx % TCES_PER_PAGE] = tce;
422}
423
424static void kvmppc_clear_tce(struct mm_struct *mm, struct iommu_table *tbl,
425 unsigned long entry)
426{
427 unsigned long hpa = 0;
428 enum dma_data_direction dir = DMA_NONE;
429
430 iommu_tce_xchg_no_kill(mm, tbl, entry, &hpa, &dir);
431}
432
433static long kvmppc_tce_iommu_mapped_dec(struct kvm *kvm,
434 struct iommu_table *tbl, unsigned long entry)
435{
436 struct mm_iommu_table_group_mem_t *mem = NULL;
437 const unsigned long pgsize = 1ULL << tbl->it_page_shift;
438 __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl, entry);
439
440 if (!pua)
441 return H_SUCCESS;
442
443 mem = mm_iommu_lookup(kvm->mm, be64_to_cpu(*pua), pgsize);
444 if (!mem)
445 return H_TOO_HARD;
446
447 mm_iommu_mapped_dec(mem);
448
449 *pua = cpu_to_be64(0);
450
451 return H_SUCCESS;
452}
453
454static long kvmppc_tce_iommu_do_unmap(struct kvm *kvm,
455 struct iommu_table *tbl, unsigned long entry)
456{
457 enum dma_data_direction dir = DMA_NONE;
458 unsigned long hpa = 0;
459 long ret;
460
461 if (WARN_ON_ONCE(iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa,
462 &dir)))
463 return H_TOO_HARD;
464
465 if (dir == DMA_NONE)
466 return H_SUCCESS;
467
468 ret = kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry);
469 if (ret != H_SUCCESS)
470 iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, &dir);
471
472 return ret;
473}
474
475static long kvmppc_tce_iommu_unmap(struct kvm *kvm,
476 struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl,
477 unsigned long entry)
478{
479 unsigned long i, ret = H_SUCCESS;
480 unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift);
481 unsigned long io_entry = entry * subpages;
482
483 for (i = 0; i < subpages; ++i) {
484 ret = kvmppc_tce_iommu_do_unmap(kvm, tbl, io_entry + i);
485 if (ret != H_SUCCESS)
486 break;
487 }
488
489 return ret;
490}
491
492static long kvmppc_tce_iommu_do_map(struct kvm *kvm, struct iommu_table *tbl,
493 unsigned long entry, unsigned long ua,
494 enum dma_data_direction dir)
495{
496 long ret;
497 unsigned long hpa;
498 __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry);
499 struct mm_iommu_table_group_mem_t *mem;
500
501 if (!pua)
502
503 return H_TOO_HARD;
504
505 mem = mm_iommu_lookup(kvm->mm, ua, 1ULL << tbl->it_page_shift);
506 if (!mem)
507
508 return H_TOO_HARD;
509
510 if (WARN_ON_ONCE(mm_iommu_ua_to_hpa(mem, ua, tbl->it_page_shift, &hpa)))
511 return H_TOO_HARD;
512
513 if (mm_iommu_mapped_inc(mem))
514 return H_TOO_HARD;
515
516 ret = iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, &dir);
517 if (WARN_ON_ONCE(ret)) {
518 mm_iommu_mapped_dec(mem);
519 return H_TOO_HARD;
520 }
521
522 if (dir != DMA_NONE)
523 kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry);
524
525 *pua = cpu_to_be64(ua);
526
527 return 0;
528}
529
530static long kvmppc_tce_iommu_map(struct kvm *kvm,
531 struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl,
532 unsigned long entry, unsigned long ua,
533 enum dma_data_direction dir)
534{
535 unsigned long i, pgoff, ret = H_SUCCESS;
536 unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift);
537 unsigned long io_entry = entry * subpages;
538
539 for (i = 0, pgoff = 0; i < subpages;
540 ++i, pgoff += IOMMU_PAGE_SIZE(tbl)) {
541
542 ret = kvmppc_tce_iommu_do_map(kvm, tbl,
543 io_entry + i, ua + pgoff, dir);
544 if (ret != H_SUCCESS)
545 break;
546 }
547
548 return ret;
549}
550
551long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
552 unsigned long ioba, unsigned long tce)
553{
554 struct kvmppc_spapr_tce_table *stt;
555 long ret, idx;
556 struct kvmppc_spapr_tce_iommu_table *stit;
557 unsigned long entry, ua = 0;
558 enum dma_data_direction dir;
559
560
561
562
563 stt = kvmppc_find_table(vcpu->kvm, liobn);
564 if (!stt)
565 return H_TOO_HARD;
566
567 ret = kvmppc_ioba_validate(stt, ioba, 1);
568 if (ret != H_SUCCESS)
569 return ret;
570
571 idx = srcu_read_lock(&vcpu->kvm->srcu);
572
573 ret = kvmppc_tce_validate(stt, tce);
574 if (ret != H_SUCCESS)
575 goto unlock_exit;
576
577 dir = iommu_tce_direction(tce);
578
579 if ((dir != DMA_NONE) && kvmppc_tce_to_ua(vcpu->kvm, tce, &ua)) {
580 ret = H_PARAMETER;
581 goto unlock_exit;
582 }
583
584 entry = ioba >> stt->page_shift;
585
586 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
587 if (dir == DMA_NONE)
588 ret = kvmppc_tce_iommu_unmap(vcpu->kvm, stt,
589 stit->tbl, entry);
590 else
591 ret = kvmppc_tce_iommu_map(vcpu->kvm, stt, stit->tbl,
592 entry, ua, dir);
593
594 iommu_tce_kill(stit->tbl, entry, 1);
595
596 if (ret != H_SUCCESS) {
597 kvmppc_clear_tce(vcpu->kvm->mm, stit->tbl, entry);
598 goto unlock_exit;
599 }
600 }
601
602 kvmppc_tce_put(stt, entry, tce);
603
604unlock_exit:
605 srcu_read_unlock(&vcpu->kvm->srcu, idx);
606
607 return ret;
608}
609EXPORT_SYMBOL_GPL(kvmppc_h_put_tce);
610
611long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu,
612 unsigned long liobn, unsigned long ioba,
613 unsigned long tce_list, unsigned long npages)
614{
615 struct kvmppc_spapr_tce_table *stt;
616 long i, ret = H_SUCCESS, idx;
617 unsigned long entry, ua = 0;
618 u64 __user *tces;
619 u64 tce;
620 struct kvmppc_spapr_tce_iommu_table *stit;
621
622 stt = kvmppc_find_table(vcpu->kvm, liobn);
623 if (!stt)
624 return H_TOO_HARD;
625
626 entry = ioba >> stt->page_shift;
627
628
629
630
631 if (npages > 512)
632 return H_PARAMETER;
633
634 if (tce_list & (SZ_4K - 1))
635 return H_PARAMETER;
636
637 ret = kvmppc_ioba_validate(stt, ioba, npages);
638 if (ret != H_SUCCESS)
639 return ret;
640
641 idx = srcu_read_lock(&vcpu->kvm->srcu);
642 if (kvmppc_tce_to_ua(vcpu->kvm, tce_list, &ua)) {
643 ret = H_TOO_HARD;
644 goto unlock_exit;
645 }
646 tces = (u64 __user *) ua;
647
648 for (i = 0; i < npages; ++i) {
649 if (get_user(tce, tces + i)) {
650 ret = H_TOO_HARD;
651 goto unlock_exit;
652 }
653 tce = be64_to_cpu(tce);
654
655 ret = kvmppc_tce_validate(stt, tce);
656 if (ret != H_SUCCESS)
657 goto unlock_exit;
658 }
659
660 for (i = 0; i < npages; ++i) {
661
662
663
664
665
666
667
668
669
670
671 if (get_user(tce, tces + i)) {
672 ret = H_TOO_HARD;
673 goto invalidate_exit;
674 }
675 tce = be64_to_cpu(tce);
676
677 if (kvmppc_tce_to_ua(vcpu->kvm, tce, &ua)) {
678 ret = H_PARAMETER;
679 goto invalidate_exit;
680 }
681
682 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
683 ret = kvmppc_tce_iommu_map(vcpu->kvm, stt,
684 stit->tbl, entry + i, ua,
685 iommu_tce_direction(tce));
686
687 if (ret != H_SUCCESS) {
688 kvmppc_clear_tce(vcpu->kvm->mm, stit->tbl,
689 entry);
690 goto invalidate_exit;
691 }
692 }
693
694 kvmppc_tce_put(stt, entry + i, tce);
695 }
696
697invalidate_exit:
698 list_for_each_entry_lockless(stit, &stt->iommu_tables, next)
699 iommu_tce_kill(stit->tbl, entry, npages);
700
701unlock_exit:
702 srcu_read_unlock(&vcpu->kvm->srcu, idx);
703
704 return ret;
705}
706EXPORT_SYMBOL_GPL(kvmppc_h_put_tce_indirect);
707
708long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu,
709 unsigned long liobn, unsigned long ioba,
710 unsigned long tce_value, unsigned long npages)
711{
712 struct kvmppc_spapr_tce_table *stt;
713 long i, ret;
714 struct kvmppc_spapr_tce_iommu_table *stit;
715
716 stt = kvmppc_find_table(vcpu->kvm, liobn);
717 if (!stt)
718 return H_TOO_HARD;
719
720 ret = kvmppc_ioba_validate(stt, ioba, npages);
721 if (ret != H_SUCCESS)
722 return ret;
723
724
725 if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ))
726 return H_PARAMETER;
727
728 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
729 unsigned long entry = ioba >> stt->page_shift;
730
731 for (i = 0; i < npages; ++i) {
732 ret = kvmppc_tce_iommu_unmap(vcpu->kvm, stt,
733 stit->tbl, entry + i);
734
735 if (ret == H_SUCCESS)
736 continue;
737
738 if (ret == H_TOO_HARD)
739 goto invalidate_exit;
740
741 WARN_ON_ONCE(1);
742 kvmppc_clear_tce(vcpu->kvm->mm, stit->tbl, entry);
743 }
744 }
745
746 for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift))
747 kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value);
748
749invalidate_exit:
750 list_for_each_entry_lockless(stit, &stt->iommu_tables, next)
751 iommu_tce_kill(stit->tbl, ioba >> stt->page_shift, npages);
752
753 return ret;
754}
755EXPORT_SYMBOL_GPL(kvmppc_h_stuff_tce);
756
