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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
47static unsigned long kvmppc_tce_pages(unsigned long iommu_pages)
48{
49 return ALIGN(iommu_pages * sizeof(u64), PAGE_SIZE) / PAGE_SIZE;
50}
51
52static 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
60static long kvmppc_account_memlimit(unsigned long stt_pages, bool inc)
61{
62 long ret = 0;
63
64 if (!current || !current->mm)
65 return ret;
66
67 down_write(¤t->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(¤t->mm->mmap_sem);
93
94 return ret;
95}
96
97static 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
107static 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
117extern 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
143extern 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
181
182
183
184 if ((tbltmp->it_page_shift == stt->page_shift) &&
185 (tbltmp->it_offset == stt->offset) &&
186 (tbltmp->it_size == stt->size)) {
187
188
189
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
204 iommu_tce_table_put(tbl);
205 return -ENOTTY;
206 }
207
208
209
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
228static 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
240static 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
254static const struct vm_operations_struct kvm_spapr_tce_vm_ops = {
255 .fault = kvm_spapr_tce_fault,
256};
257
258static 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
264static 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 struct kvm *kvm = stt->kvm;
269
270 mutex_lock(&kvm->lock);
271 list_del_rcu(&stt->list);
272 mutex_unlock(&kvm->lock);
273
274 list_for_each_entry_safe(stit, tmp, &stt->iommu_tables, next) {
275 WARN_ON(!kref_read(&stit->kref));
276 while (1) {
277 if (kref_put(&stit->kref, kvm_spapr_tce_liobn_put))
278 break;
279 }
280 }
281
282 kvm_put_kvm(stt->kvm);
283
284 kvmppc_account_memlimit(
285 kvmppc_stt_pages(kvmppc_tce_pages(stt->size)), false);
286 call_rcu(&stt->rcu, release_spapr_tce_table);
287
288 return 0;
289}
290
291static const struct file_operations kvm_spapr_tce_fops = {
292 .mmap = kvm_spapr_tce_mmap,
293 .release = kvm_spapr_tce_release,
294};
295
296long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
297 struct kvm_create_spapr_tce_64 *args)
298{
299 struct kvmppc_spapr_tce_table *stt = NULL;
300 struct kvmppc_spapr_tce_table *siter;
301 unsigned long npages, size;
302 int ret = -ENOMEM;
303 int i;
304
305 if (!args->size)
306 return -EINVAL;
307
308 size = _ALIGN_UP(args->size, PAGE_SIZE >> 3);
309 npages = kvmppc_tce_pages(size);
310 ret = kvmppc_account_memlimit(kvmppc_stt_pages(npages), true);
311 if (ret)
312 return ret;
313
314 ret = -ENOMEM;
315 stt = kzalloc(sizeof(*stt) + npages * sizeof(struct page *),
316 GFP_KERNEL);
317 if (!stt)
318 goto fail_acct;
319
320 stt->liobn = args->liobn;
321 stt->page_shift = args->page_shift;
322 stt->offset = args->offset;
323 stt->size = size;
324 stt->kvm = kvm;
325 INIT_LIST_HEAD_RCU(&stt->iommu_tables);
326
327 for (i = 0; i < npages; i++) {
328 stt->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO);
329 if (!stt->pages[i])
330 goto fail;
331 }
332
333 mutex_lock(&kvm->lock);
334
335
336 ret = 0;
337 list_for_each_entry(siter, &kvm->arch.spapr_tce_tables, list) {
338 if (siter->liobn == args->liobn) {
339 ret = -EBUSY;
340 break;
341 }
342 }
343
344 if (!ret)
345 ret = anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops,
346 stt, O_RDWR | O_CLOEXEC);
347
348 if (ret >= 0) {
349 list_add_rcu(&stt->list, &kvm->arch.spapr_tce_tables);
350 kvm_get_kvm(kvm);
351 }
352
353 mutex_unlock(&kvm->lock);
354
355 if (ret >= 0)
356 return ret;
357
358 fail:
359 for (i = 0; i < npages; i++)
360 if (stt->pages[i])
361 __free_page(stt->pages[i]);
362
363 kfree(stt);
364 fail_acct:
365 kvmppc_account_memlimit(kvmppc_stt_pages(npages), false);
366 return ret;
367}
368
369static void kvmppc_clear_tce(struct iommu_table *tbl, unsigned long entry)
370{
371 unsigned long hpa = 0;
372 enum dma_data_direction dir = DMA_NONE;
373
374 iommu_tce_xchg(tbl, entry, &hpa, &dir);
375}
376
377static long kvmppc_tce_iommu_mapped_dec(struct kvm *kvm,
378 struct iommu_table *tbl, unsigned long entry)
379{
380 struct mm_iommu_table_group_mem_t *mem = NULL;
381 const unsigned long pgsize = 1ULL << tbl->it_page_shift;
382 unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry);
383
384 if (!pua)
385
386 return H_TOO_HARD;
387
388 mem = mm_iommu_lookup(kvm->mm, *pua, pgsize);
389 if (!mem)
390 return H_TOO_HARD;
391
392 mm_iommu_mapped_dec(mem);
393
394 *pua = 0;
395
396 return H_SUCCESS;
397}
398
399static long kvmppc_tce_iommu_unmap(struct kvm *kvm,
400 struct iommu_table *tbl, unsigned long entry)
401{
402 enum dma_data_direction dir = DMA_NONE;
403 unsigned long hpa = 0;
404 long ret;
405
406 if (WARN_ON_ONCE(iommu_tce_xchg(tbl, entry, &hpa, &dir)))
407 return H_HARDWARE;
408
409 if (dir == DMA_NONE)
410 return H_SUCCESS;
411
412 ret = kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry);
413 if (ret != H_SUCCESS)
414 iommu_tce_xchg(tbl, entry, &hpa, &dir);
415
416 return ret;
417}
418
419long kvmppc_tce_iommu_map(struct kvm *kvm, struct iommu_table *tbl,
420 unsigned long entry, unsigned long ua,
421 enum dma_data_direction dir)
422{
423 long ret;
424 unsigned long hpa, *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry);
425 struct mm_iommu_table_group_mem_t *mem;
426
427 if (!pua)
428
429 return H_TOO_HARD;
430
431 mem = mm_iommu_lookup(kvm->mm, ua, 1ULL << tbl->it_page_shift);
432 if (!mem)
433
434 return H_TOO_HARD;
435
436 if (WARN_ON_ONCE(mm_iommu_ua_to_hpa(mem, ua, &hpa)))
437 return H_HARDWARE;
438
439 if (mm_iommu_mapped_inc(mem))
440 return H_CLOSED;
441
442 ret = iommu_tce_xchg(tbl, entry, &hpa, &dir);
443 if (WARN_ON_ONCE(ret)) {
444 mm_iommu_mapped_dec(mem);
445 return H_HARDWARE;
446 }
447
448 if (dir != DMA_NONE)
449 kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry);
450
451 *pua = ua;
452
453 return 0;
454}
455
456long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
457 unsigned long ioba, unsigned long tce)
458{
459 struct kvmppc_spapr_tce_table *stt;
460 long ret, idx;
461 struct kvmppc_spapr_tce_iommu_table *stit;
462 unsigned long entry, ua = 0;
463 enum dma_data_direction dir;
464
465
466
467
468 stt = kvmppc_find_table(vcpu->kvm, liobn);
469 if (!stt)
470 return H_TOO_HARD;
471
472 ret = kvmppc_ioba_validate(stt, ioba, 1);
473 if (ret != H_SUCCESS)
474 return ret;
475
476 ret = kvmppc_tce_validate(stt, tce);
477 if (ret != H_SUCCESS)
478 return ret;
479
480 dir = iommu_tce_direction(tce);
481
482 idx = srcu_read_lock(&vcpu->kvm->srcu);
483
484 if ((dir != DMA_NONE) && kvmppc_gpa_to_ua(vcpu->kvm,
485 tce & ~(TCE_PCI_READ | TCE_PCI_WRITE), &ua, NULL)) {
486 ret = H_PARAMETER;
487 goto unlock_exit;
488 }
489
490 entry = ioba >> stt->page_shift;
491
492 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
493 if (dir == DMA_NONE)
494 ret = kvmppc_tce_iommu_unmap(vcpu->kvm,
495 stit->tbl, entry);
496 else
497 ret = kvmppc_tce_iommu_map(vcpu->kvm, stit->tbl,
498 entry, ua, dir);
499
500 if (ret == H_SUCCESS)
501 continue;
502
503 if (ret == H_TOO_HARD)
504 goto unlock_exit;
505
506 WARN_ON_ONCE(1);
507 kvmppc_clear_tce(stit->tbl, entry);
508 }
509
510 kvmppc_tce_put(stt, entry, tce);
511
512unlock_exit:
513 srcu_read_unlock(&vcpu->kvm->srcu, idx);
514
515 return ret;
516}
517EXPORT_SYMBOL_GPL(kvmppc_h_put_tce);
518
519long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu,
520 unsigned long liobn, unsigned long ioba,
521 unsigned long tce_list, unsigned long npages)
522{
523 struct kvmppc_spapr_tce_table *stt;
524 long i, ret = H_SUCCESS, idx;
525 unsigned long entry, ua = 0;
526 u64 __user *tces;
527 u64 tce;
528 struct kvmppc_spapr_tce_iommu_table *stit;
529
530 stt = kvmppc_find_table(vcpu->kvm, liobn);
531 if (!stt)
532 return H_TOO_HARD;
533
534 entry = ioba >> stt->page_shift;
535
536
537
538
539 if (npages > 512)
540 return H_PARAMETER;
541
542 if (tce_list & (SZ_4K - 1))
543 return H_PARAMETER;
544
545 ret = kvmppc_ioba_validate(stt, ioba, npages);
546 if (ret != H_SUCCESS)
547 return ret;
548
549 idx = srcu_read_lock(&vcpu->kvm->srcu);
550 if (kvmppc_gpa_to_ua(vcpu->kvm, tce_list, &ua, NULL)) {
551 ret = H_TOO_HARD;
552 goto unlock_exit;
553 }
554 tces = (u64 __user *) ua;
555
556 for (i = 0; i < npages; ++i) {
557 if (get_user(tce, tces + i)) {
558 ret = H_TOO_HARD;
559 goto unlock_exit;
560 }
561 tce = be64_to_cpu(tce);
562
563 ret = kvmppc_tce_validate(stt, tce);
564 if (ret != H_SUCCESS)
565 goto unlock_exit;
566
567 if (kvmppc_gpa_to_ua(vcpu->kvm,
568 tce & ~(TCE_PCI_READ | TCE_PCI_WRITE),
569 &ua, NULL))
570 return H_PARAMETER;
571
572 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
573 ret = kvmppc_tce_iommu_map(vcpu->kvm,
574 stit->tbl, entry + i, ua,
575 iommu_tce_direction(tce));
576
577 if (ret == H_SUCCESS)
578 continue;
579
580 if (ret == H_TOO_HARD)
581 goto unlock_exit;
582
583 WARN_ON_ONCE(1);
584 kvmppc_clear_tce(stit->tbl, entry);
585 }
586
587 kvmppc_tce_put(stt, entry + i, tce);
588 }
589
590unlock_exit:
591 srcu_read_unlock(&vcpu->kvm->srcu, idx);
592
593 return ret;
594}
595EXPORT_SYMBOL_GPL(kvmppc_h_put_tce_indirect);
596
597long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu,
598 unsigned long liobn, unsigned long ioba,
599 unsigned long tce_value, unsigned long npages)
600{
601 struct kvmppc_spapr_tce_table *stt;
602 long i, ret;
603 struct kvmppc_spapr_tce_iommu_table *stit;
604
605 stt = kvmppc_find_table(vcpu->kvm, liobn);
606 if (!stt)
607 return H_TOO_HARD;
608
609 ret = kvmppc_ioba_validate(stt, ioba, npages);
610 if (ret != H_SUCCESS)
611 return ret;
612
613
614 if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ))
615 return H_PARAMETER;
616
617 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
618 unsigned long entry = ioba >> stit->tbl->it_page_shift;
619
620 for (i = 0; i < npages; ++i) {
621 ret = kvmppc_tce_iommu_unmap(vcpu->kvm,
622 stit->tbl, entry + i);
623
624 if (ret == H_SUCCESS)
625 continue;
626
627 if (ret == H_TOO_HARD)
628 return ret;
629
630 WARN_ON_ONCE(1);
631 kvmppc_clear_tce(stit->tbl, entry);
632 }
633 }
634
635 for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift))
636 kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value);
637
638 return H_SUCCESS;
639}
640EXPORT_SYMBOL_GPL(kvmppc_h_stuff_tce);
641