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TOMOYO Linux Cross Reference
Linux/arch/powerpc/kvm/book3s_64_vio.c

Version: ~ [ linux-5.13-rc5 ] ~ [ linux-5.12.9 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.42 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.124 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.193 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.235 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.271 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.271 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * This program is free software; you can redistribute it and/or modify
  3  * it under the terms of the GNU General Public License, version 2, as
  4  * published by the Free Software Foundation.
  5  *
  6  * This program is distributed in the hope that it will be useful,
  7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  9  * GNU General Public License for more details.
 10  *
 11  * You should have received a copy of the GNU General Public License
 12  * along with this program; if not, write to the Free Software
 13  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 14  *
 15  * Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
 16  * Copyright 2011 David Gibson, IBM Corporation <dwg@au1.ibm.com>
 17  * Copyright 2016 Alexey Kardashevskiy, IBM Corporation <aik@au1.ibm.com>
 18  */
 19 
 20 #include <linux/types.h>
 21 #include <linux/string.h>
 22 #include <linux/kvm.h>
 23 #include <linux/kvm_host.h>
 24 #include <linux/highmem.h>
 25 #include <linux/gfp.h>
 26 #include <linux/slab.h>
 27 #include <linux/sched/signal.h>
 28 #include <linux/hugetlb.h>
 29 #include <linux/list.h>
 30 #include <linux/anon_inodes.h>
 31 #include <linux/iommu.h>
 32 #include <linux/file.h>
 33 
 34 #include <asm/tlbflush.h>
 35 #include <asm/kvm_ppc.h>
 36 #include <asm/kvm_book3s.h>
 37 #include <asm/book3s/64/mmu-hash.h>
 38 #include <asm/hvcall.h>
 39 #include <asm/synch.h>
 40 #include <asm/ppc-opcode.h>
 41 #include <asm/kvm_host.h>
 42 #include <asm/udbg.h>
 43 #include <asm/iommu.h>
 44 #include <asm/tce.h>
 45 #include <asm/mmu_context.h>
 46 
 47 static unsigned long kvmppc_tce_pages(unsigned long iommu_pages)
 48 {
 49         return ALIGN(iommu_pages * sizeof(u64), PAGE_SIZE) / PAGE_SIZE;
 50 }
 51 
 52 static unsigned long kvmppc_stt_pages(unsigned long tce_pages)
 53 {
 54         unsigned long stt_bytes = sizeof(struct kvmppc_spapr_tce_table) +
 55                         (tce_pages * sizeof(struct page *));
 56 
 57         return tce_pages + ALIGN(stt_bytes, PAGE_SIZE) / PAGE_SIZE;
 58 }
 59 
 60 static long kvmppc_account_memlimit(unsigned long stt_pages, bool inc)
 61 {
 62         long ret = 0;
 63 
 64         if (!current || !current->mm)
 65                 return ret; /* process exited */
 66 
 67         down_write(&current->mm->mmap_sem);
 68 
 69         if (inc) {
 70                 unsigned long locked, lock_limit;
 71 
 72                 locked = current->mm->locked_vm + stt_pages;
 73                 lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
 74                 if (locked > lock_limit && !capable(CAP_IPC_LOCK))
 75                         ret = -ENOMEM;
 76                 else
 77                         current->mm->locked_vm += stt_pages;
 78         } else {
 79                 if (WARN_ON_ONCE(stt_pages > current->mm->locked_vm))
 80                         stt_pages = current->mm->locked_vm;
 81 
 82                 current->mm->locked_vm -= stt_pages;
 83         }
 84 
 85         pr_debug("[%d] RLIMIT_MEMLOCK KVM %c%ld %ld/%ld%s\n", current->pid,
 86                         inc ? '+' : '-',
 87                         stt_pages << PAGE_SHIFT,
 88                         current->mm->locked_vm << PAGE_SHIFT,
 89                         rlimit(RLIMIT_MEMLOCK),
 90                         ret ? " - exceeded" : "");
 91 
 92         up_write(&current->mm->mmap_sem);
 93 
 94         return ret;
 95 }
 96 
 97 static void kvm_spapr_tce_iommu_table_free(struct rcu_head *head)
 98 {
 99         struct kvmppc_spapr_tce_iommu_table *stit = container_of(head,
100                         struct kvmppc_spapr_tce_iommu_table, rcu);
101 
102         iommu_tce_table_put(stit->tbl);
103 
104         kfree(stit);
105 }
106 
107 static void kvm_spapr_tce_liobn_put(struct kref *kref)
108 {
109         struct kvmppc_spapr_tce_iommu_table *stit = container_of(kref,
110                         struct kvmppc_spapr_tce_iommu_table, kref);
111 
112         list_del_rcu(&stit->next);
113 
114         call_rcu(&stit->rcu, kvm_spapr_tce_iommu_table_free);
115 }
116 
117 extern void kvm_spapr_tce_release_iommu_group(struct kvm *kvm,
118                 struct iommu_group *grp)
119 {
120         int i;
121         struct kvmppc_spapr_tce_table *stt;
122         struct kvmppc_spapr_tce_iommu_table *stit, *tmp;
123         struct iommu_table_group *table_group = NULL;
124 
125         list_for_each_entry_rcu(stt, &kvm->arch.spapr_tce_tables, list) {
126 
127                 table_group = iommu_group_get_iommudata(grp);
128                 if (WARN_ON(!table_group))
129                         continue;
130 
131                 list_for_each_entry_safe(stit, tmp, &stt->iommu_tables, next) {
132                         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
133                                 if (table_group->tables[i] != stit->tbl)
134                                         continue;
135 
136                                 kref_put(&stit->kref, kvm_spapr_tce_liobn_put);
137                                 return;
138                         }
139                 }
140         }
141 }
142 
143 extern long kvm_spapr_tce_attach_iommu_group(struct kvm *kvm, int tablefd,
144                 struct iommu_group *grp)
145 {
146         struct kvmppc_spapr_tce_table *stt = NULL;
147         bool found = false;
148         struct iommu_table *tbl = NULL;
149         struct iommu_table_group *table_group;
150         long i;
151         struct kvmppc_spapr_tce_iommu_table *stit;
152         struct fd f;
153 
154         f = fdget(tablefd);
155         if (!f.file)
156                 return -EBADF;
157 
158         list_for_each_entry_rcu(stt, &kvm->arch.spapr_tce_tables, list) {
159                 if (stt == f.file->private_data) {
160                         found = true;
161                         break;
162                 }
163         }
164 
165         fdput(f);
166 
167         if (!found)
168                 return -EINVAL;
169 
170         table_group = iommu_group_get_iommudata(grp);
171         if (WARN_ON(!table_group))
172                 return -EFAULT;
173 
174         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
175                 struct iommu_table *tbltmp = table_group->tables[i];
176 
177                 if (!tbltmp)
178                         continue;
179                 /*
180                  * Make sure hardware table parameters are exactly the same;
181                  * this is used in the TCE handlers where boundary checks
182                  * use only the first attached table.
183                  */
184                 if ((tbltmp->it_page_shift == stt->page_shift) &&
185                                 (tbltmp->it_offset == stt->offset) &&
186                                 (tbltmp->it_size == stt->size)) {
187                         /*
188                          * Reference the table to avoid races with
189                          * add/remove DMA windows.
190                          */
191                         tbl = iommu_tce_table_get(tbltmp);
192                         break;
193                 }
194         }
195         if (!tbl)
196                 return -EINVAL;
197 
198         list_for_each_entry_rcu(stit, &stt->iommu_tables, next) {
199                 if (tbl != stit->tbl)
200                         continue;
201 
202                 if (!kref_get_unless_zero(&stit->kref)) {
203                         /* stit is being destroyed */
204                         iommu_tce_table_put(tbl);
205                         return -ENOTTY;
206                 }
207                 /*
208                  * The table is already known to this KVM, we just increased
209                  * its KVM reference counter and can return.
210                  */
211                 return 0;
212         }
213 
214         stit = kzalloc(sizeof(*stit), GFP_KERNEL);
215         if (!stit) {
216                 iommu_tce_table_put(tbl);
217                 return -ENOMEM;
218         }
219 
220         stit->tbl = tbl;
221         kref_init(&stit->kref);
222 
223         list_add_rcu(&stit->next, &stt->iommu_tables);
224 
225         return 0;
226 }
227 
228 static void release_spapr_tce_table(struct rcu_head *head)
229 {
230         struct kvmppc_spapr_tce_table *stt = container_of(head,
231                         struct kvmppc_spapr_tce_table, rcu);
232         unsigned long i, npages = kvmppc_tce_pages(stt->size);
233 
234         for (i = 0; i < npages; i++)
235                 __free_page(stt->pages[i]);
236 
237         kfree(stt);
238 }
239 
240 static int kvm_spapr_tce_fault(struct vm_fault *vmf)
241 {
242         struct kvmppc_spapr_tce_table *stt = vmf->vma->vm_file->private_data;
243         struct page *page;
244 
245         if (vmf->pgoff >= kvmppc_tce_pages(stt->size))
246                 return VM_FAULT_SIGBUS;
247 
248         page = stt->pages[vmf->pgoff];
249         get_page(page);
250         vmf->page = page;
251         return 0;
252 }
253 
254 static const struct vm_operations_struct kvm_spapr_tce_vm_ops = {
255         .fault = kvm_spapr_tce_fault,
256 };
257 
258 static int kvm_spapr_tce_mmap(struct file *file, struct vm_area_struct *vma)
259 {
260         vma->vm_ops = &kvm_spapr_tce_vm_ops;
261         return 0;
262 }
263 
264 static int kvm_spapr_tce_release(struct inode *inode, struct file *filp)
265 {
266         struct kvmppc_spapr_tce_table *stt = filp->private_data;
267         struct kvmppc_spapr_tce_iommu_table *stit, *tmp;
268 
269         list_del_rcu(&stt->list);
270 
271         list_for_each_entry_safe(stit, tmp, &stt->iommu_tables, next) {
272                 WARN_ON(!kref_read(&stit->kref));
273                 while (1) {
274                         if (kref_put(&stit->kref, kvm_spapr_tce_liobn_put))
275                                 break;
276                 }
277         }
278 
279         kvm_put_kvm(stt->kvm);
280 
281         kvmppc_account_memlimit(
282                 kvmppc_stt_pages(kvmppc_tce_pages(stt->size)), false);
283         call_rcu(&stt->rcu, release_spapr_tce_table);
284 
285         return 0;
286 }
287 
288 static const struct file_operations kvm_spapr_tce_fops = {
289         .mmap           = kvm_spapr_tce_mmap,
290         .release        = kvm_spapr_tce_release,
291 };
292 
293 long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
294                                    struct kvm_create_spapr_tce_64 *args)
295 {
296         struct kvmppc_spapr_tce_table *stt = NULL;
297         unsigned long npages, size;
298         int ret = -ENOMEM;
299         int i;
300 
301         if (!args->size)
302                 return -EINVAL;
303 
304         /* Check this LIOBN hasn't been previously allocated */
305         list_for_each_entry(stt, &kvm->arch.spapr_tce_tables, list) {
306                 if (stt->liobn == args->liobn)
307                         return -EBUSY;
308         }
309 
310         size = _ALIGN_UP(args->size, PAGE_SIZE >> 3);
311         npages = kvmppc_tce_pages(size);
312         ret = kvmppc_account_memlimit(kvmppc_stt_pages(npages), true);
313         if (ret) {
314                 stt = NULL;
315                 goto fail;
316         }
317 
318         ret = -ENOMEM;
319         stt = kzalloc(sizeof(*stt) + npages * sizeof(struct page *),
320                       GFP_KERNEL);
321         if (!stt)
322                 goto fail;
323 
324         stt->liobn = args->liobn;
325         stt->page_shift = args->page_shift;
326         stt->offset = args->offset;
327         stt->size = size;
328         stt->kvm = kvm;
329         INIT_LIST_HEAD_RCU(&stt->iommu_tables);
330 
331         for (i = 0; i < npages; i++) {
332                 stt->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO);
333                 if (!stt->pages[i])
334                         goto fail;
335         }
336 
337         kvm_get_kvm(kvm);
338 
339         mutex_lock(&kvm->lock);
340         list_add_rcu(&stt->list, &kvm->arch.spapr_tce_tables);
341 
342         mutex_unlock(&kvm->lock);
343 
344         return anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops,
345                                 stt, O_RDWR | O_CLOEXEC);
346 
347 fail:
348         if (stt) {
349                 for (i = 0; i < npages; i++)
350                         if (stt->pages[i])
351                                 __free_page(stt->pages[i]);
352 
353                 kfree(stt);
354         }
355         return ret;
356 }
357 
358 static void kvmppc_clear_tce(struct iommu_table *tbl, unsigned long entry)
359 {
360         unsigned long hpa = 0;
361         enum dma_data_direction dir = DMA_NONE;
362 
363         iommu_tce_xchg(tbl, entry, &hpa, &dir);
364 }
365 
366 static long kvmppc_tce_iommu_mapped_dec(struct kvm *kvm,
367                 struct iommu_table *tbl, unsigned long entry)
368 {
369         struct mm_iommu_table_group_mem_t *mem = NULL;
370         const unsigned long pgsize = 1ULL << tbl->it_page_shift;
371         unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry);
372 
373         if (!pua)
374                 /* it_userspace allocation might be delayed */
375                 return H_TOO_HARD;
376 
377         mem = mm_iommu_lookup(kvm->mm, *pua, pgsize);
378         if (!mem)
379                 return H_TOO_HARD;
380 
381         mm_iommu_mapped_dec(mem);
382 
383         *pua = 0;
384 
385         return H_SUCCESS;
386 }
387 
388 static long kvmppc_tce_iommu_unmap(struct kvm *kvm,
389                 struct iommu_table *tbl, unsigned long entry)
390 {
391         enum dma_data_direction dir = DMA_NONE;
392         unsigned long hpa = 0;
393         long ret;
394 
395         if (WARN_ON_ONCE(iommu_tce_xchg(tbl, entry, &hpa, &dir)))
396                 return H_HARDWARE;
397 
398         if (dir == DMA_NONE)
399                 return H_SUCCESS;
400 
401         ret = kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry);
402         if (ret != H_SUCCESS)
403                 iommu_tce_xchg(tbl, entry, &hpa, &dir);
404 
405         return ret;
406 }
407 
408 long kvmppc_tce_iommu_map(struct kvm *kvm, struct iommu_table *tbl,
409                 unsigned long entry, unsigned long ua,
410                 enum dma_data_direction dir)
411 {
412         long ret;
413         unsigned long hpa, *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry);
414         struct mm_iommu_table_group_mem_t *mem;
415 
416         if (!pua)
417                 /* it_userspace allocation might be delayed */
418                 return H_TOO_HARD;
419 
420         mem = mm_iommu_lookup(kvm->mm, ua, 1ULL << tbl->it_page_shift);
421         if (!mem)
422                 /* This only handles v2 IOMMU type, v1 is handled via ioctl() */
423                 return H_TOO_HARD;
424 
425         if (WARN_ON_ONCE(mm_iommu_ua_to_hpa(mem, ua, &hpa)))
426                 return H_HARDWARE;
427 
428         if (mm_iommu_mapped_inc(mem))
429                 return H_CLOSED;
430 
431         ret = iommu_tce_xchg(tbl, entry, &hpa, &dir);
432         if (WARN_ON_ONCE(ret)) {
433                 mm_iommu_mapped_dec(mem);
434                 return H_HARDWARE;
435         }
436 
437         if (dir != DMA_NONE)
438                 kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry);
439 
440         *pua = ua;
441 
442         return 0;
443 }
444 
445 long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
446                       unsigned long ioba, unsigned long tce)
447 {
448         struct kvmppc_spapr_tce_table *stt;
449         long ret, idx;
450         struct kvmppc_spapr_tce_iommu_table *stit;
451         unsigned long entry, ua = 0;
452         enum dma_data_direction dir;
453 
454         /* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */
455         /*          liobn, ioba, tce); */
456 
457         stt = kvmppc_find_table(vcpu->kvm, liobn);
458         if (!stt)
459                 return H_TOO_HARD;
460 
461         ret = kvmppc_ioba_validate(stt, ioba, 1);
462         if (ret != H_SUCCESS)
463                 return ret;
464 
465         ret = kvmppc_tce_validate(stt, tce);
466         if (ret != H_SUCCESS)
467                 return ret;
468 
469         dir = iommu_tce_direction(tce);
470         if ((dir != DMA_NONE) && kvmppc_gpa_to_ua(vcpu->kvm,
471                         tce & ~(TCE_PCI_READ | TCE_PCI_WRITE), &ua, NULL))
472                 return H_PARAMETER;
473 
474         entry = ioba >> stt->page_shift;
475 
476         list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
477                 if (dir == DMA_NONE) {
478                         ret = kvmppc_tce_iommu_unmap(vcpu->kvm,
479                                         stit->tbl, entry);
480                 } else {
481                         idx = srcu_read_lock(&vcpu->kvm->srcu);
482                         ret = kvmppc_tce_iommu_map(vcpu->kvm, stit->tbl,
483                                         entry, ua, dir);
484                         srcu_read_unlock(&vcpu->kvm->srcu, idx);
485                 }
486 
487                 if (ret == H_SUCCESS)
488                         continue;
489 
490                 if (ret == H_TOO_HARD)
491                         return ret;
492 
493                 WARN_ON_ONCE(1);
494                 kvmppc_clear_tce(stit->tbl, entry);
495         }
496 
497         kvmppc_tce_put(stt, entry, tce);
498 
499         return H_SUCCESS;
500 }
501 EXPORT_SYMBOL_GPL(kvmppc_h_put_tce);
502 
503 long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu,
504                 unsigned long liobn, unsigned long ioba,
505                 unsigned long tce_list, unsigned long npages)
506 {
507         struct kvmppc_spapr_tce_table *stt;
508         long i, ret = H_SUCCESS, idx;
509         unsigned long entry, ua = 0;
510         u64 __user *tces;
511         u64 tce;
512         struct kvmppc_spapr_tce_iommu_table *stit;
513 
514         stt = kvmppc_find_table(vcpu->kvm, liobn);
515         if (!stt)
516                 return H_TOO_HARD;
517 
518         entry = ioba >> stt->page_shift;
519         /*
520          * SPAPR spec says that the maximum size of the list is 512 TCEs
521          * so the whole table fits in 4K page
522          */
523         if (npages > 512)
524                 return H_PARAMETER;
525 
526         if (tce_list & (SZ_4K - 1))
527                 return H_PARAMETER;
528 
529         ret = kvmppc_ioba_validate(stt, ioba, npages);
530         if (ret != H_SUCCESS)
531                 return ret;
532 
533         idx = srcu_read_lock(&vcpu->kvm->srcu);
534         if (kvmppc_gpa_to_ua(vcpu->kvm, tce_list, &ua, NULL)) {
535                 ret = H_TOO_HARD;
536                 goto unlock_exit;
537         }
538         tces = (u64 __user *) ua;
539 
540         for (i = 0; i < npages; ++i) {
541                 if (get_user(tce, tces + i)) {
542                         ret = H_TOO_HARD;
543                         goto unlock_exit;
544                 }
545                 tce = be64_to_cpu(tce);
546 
547                 ret = kvmppc_tce_validate(stt, tce);
548                 if (ret != H_SUCCESS)
549                         goto unlock_exit;
550 
551                 if (kvmppc_gpa_to_ua(vcpu->kvm,
552                                 tce & ~(TCE_PCI_READ | TCE_PCI_WRITE),
553                                 &ua, NULL))
554                         return H_PARAMETER;
555 
556                 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
557                         ret = kvmppc_tce_iommu_map(vcpu->kvm,
558                                         stit->tbl, entry + i, ua,
559                                         iommu_tce_direction(tce));
560 
561                         if (ret == H_SUCCESS)
562                                 continue;
563 
564                         if (ret == H_TOO_HARD)
565                                 goto unlock_exit;
566 
567                         WARN_ON_ONCE(1);
568                         kvmppc_clear_tce(stit->tbl, entry);
569                 }
570 
571                 kvmppc_tce_put(stt, entry + i, tce);
572         }
573 
574 unlock_exit:
575         srcu_read_unlock(&vcpu->kvm->srcu, idx);
576 
577         return ret;
578 }
579 EXPORT_SYMBOL_GPL(kvmppc_h_put_tce_indirect);
580 
581 long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu,
582                 unsigned long liobn, unsigned long ioba,
583                 unsigned long tce_value, unsigned long npages)
584 {
585         struct kvmppc_spapr_tce_table *stt;
586         long i, ret;
587         struct kvmppc_spapr_tce_iommu_table *stit;
588 
589         stt = kvmppc_find_table(vcpu->kvm, liobn);
590         if (!stt)
591                 return H_TOO_HARD;
592 
593         ret = kvmppc_ioba_validate(stt, ioba, npages);
594         if (ret != H_SUCCESS)
595                 return ret;
596 
597         /* Check permission bits only to allow userspace poison TCE for debug */
598         if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ))
599                 return H_PARAMETER;
600 
601         list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
602                 unsigned long entry = ioba >> stit->tbl->it_page_shift;
603 
604                 for (i = 0; i < npages; ++i) {
605                         ret = kvmppc_tce_iommu_unmap(vcpu->kvm,
606                                         stit->tbl, entry + i);
607 
608                         if (ret == H_SUCCESS)
609                                 continue;
610 
611                         if (ret == H_TOO_HARD)
612                                 return ret;
613 
614                         WARN_ON_ONCE(1);
615                         kvmppc_clear_tce(stit->tbl, entry);
616                 }
617         }
618 
619         for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift))
620                 kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value);
621 
622         return H_SUCCESS;
623 }
624 EXPORT_SYMBOL_GPL(kvmppc_h_stuff_tce);
625 

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