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f31e65e1 BH |
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> | |
d3695aa4 | 17 | * Copyright 2016 Alexey Kardashevskiy, IBM Corporation <aik@au1.ibm.com> |
f31e65e1 BH |
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> | |
3f07c014 | 27 | #include <linux/sched/signal.h> |
f31e65e1 BH |
28 | #include <linux/hugetlb.h> |
29 | #include <linux/list.h> | |
30 | #include <linux/anon_inodes.h> | |
121f80ba AK |
31 | #include <linux/iommu.h> |
32 | #include <linux/file.h> | |
f31e65e1 BH |
33 | |
34 | #include <asm/tlbflush.h> | |
35 | #include <asm/kvm_ppc.h> | |
36 | #include <asm/kvm_book3s.h> | |
f64e8084 | 37 | #include <asm/book3s/64/mmu-hash.h> |
f31e65e1 BH |
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> | |
462ee11e | 43 | #include <asm/iommu.h> |
d3695aa4 | 44 | #include <asm/tce.h> |
121f80ba | 45 | #include <asm/mmu_context.h> |
f31e65e1 | 46 | |
fe26e527 | 47 | static unsigned long kvmppc_tce_pages(unsigned long iommu_pages) |
f31e65e1 | 48 | { |
fe26e527 | 49 | return ALIGN(iommu_pages * sizeof(u64), PAGE_SIZE) / PAGE_SIZE; |
f31e65e1 BH |
50 | } |
51 | ||
f8626985 AK |
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(¤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 | ||
121f80ba AK |
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 | ||
366baf28 | 228 | static void release_spapr_tce_table(struct rcu_head *head) |
f31e65e1 | 229 | { |
366baf28 AK |
230 | struct kvmppc_spapr_tce_table *stt = container_of(head, |
231 | struct kvmppc_spapr_tce_table, rcu); | |
fe26e527 | 232 | unsigned long i, npages = kvmppc_tce_pages(stt->size); |
f31e65e1 | 233 | |
f8626985 | 234 | for (i = 0; i < npages; i++) |
f31e65e1 | 235 | __free_page(stt->pages[i]); |
f31e65e1 | 236 | |
366baf28 | 237 | kfree(stt); |
f31e65e1 BH |
238 | } |
239 | ||
11bac800 | 240 | static int kvm_spapr_tce_fault(struct vm_fault *vmf) |
f31e65e1 | 241 | { |
11bac800 | 242 | struct kvmppc_spapr_tce_table *stt = vmf->vma->vm_file->private_data; |
f31e65e1 BH |
243 | struct page *page; |
244 | ||
fe26e527 | 245 | if (vmf->pgoff >= kvmppc_tce_pages(stt->size)) |
f31e65e1 BH |
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; | |
121f80ba | 267 | struct kvmppc_spapr_tce_iommu_table *stit, *tmp; |
f31e65e1 | 268 | |
366baf28 AK |
269 | list_del_rcu(&stt->list); |
270 | ||
121f80ba AK |
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 | ||
366baf28 AK |
279 | kvm_put_kvm(stt->kvm); |
280 | ||
f8626985 | 281 | kvmppc_account_memlimit( |
fe26e527 | 282 | kvmppc_stt_pages(kvmppc_tce_pages(stt->size)), false); |
366baf28 AK |
283 | call_rcu(&stt->rcu, release_spapr_tce_table); |
284 | ||
f31e65e1 BH |
285 | return 0; |
286 | } | |
287 | ||
75ef9de1 | 288 | static const struct file_operations kvm_spapr_tce_fops = { |
f31e65e1 BH |
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, | |
58ded420 | 294 | struct kvm_create_spapr_tce_64 *args) |
f31e65e1 BH |
295 | { |
296 | struct kvmppc_spapr_tce_table *stt = NULL; | |
47c5310a | 297 | struct kvmppc_spapr_tce_table *siter; |
fe26e527 | 298 | unsigned long npages, size; |
f31e65e1 BH |
299 | int ret = -ENOMEM; |
300 | int i; | |
47c5310a | 301 | int fd = -1; |
f31e65e1 | 302 | |
58ded420 AK |
303 | if (!args->size) |
304 | return -EINVAL; | |
305 | ||
3762d45a | 306 | size = _ALIGN_UP(args->size, PAGE_SIZE >> 3); |
fe26e527 | 307 | npages = kvmppc_tce_pages(size); |
f8626985 | 308 | ret = kvmppc_account_memlimit(kvmppc_stt_pages(npages), true); |
47c5310a PM |
309 | if (ret) |
310 | return ret; | |
f31e65e1 | 311 | |
5982f084 | 312 | ret = -ENOMEM; |
f31e65e1 BH |
313 | stt = kzalloc(sizeof(*stt) + npages * sizeof(struct page *), |
314 | GFP_KERNEL); | |
315 | if (!stt) | |
47c5310a | 316 | goto fail_acct; |
f31e65e1 BH |
317 | |
318 | stt->liobn = args->liobn; | |
58ded420 AK |
319 | stt->page_shift = args->page_shift; |
320 | stt->offset = args->offset; | |
fe26e527 | 321 | stt->size = size; |
f31e65e1 | 322 | stt->kvm = kvm; |
121f80ba | 323 | INIT_LIST_HEAD_RCU(&stt->iommu_tables); |
f31e65e1 BH |
324 | |
325 | for (i = 0; i < npages; i++) { | |
326 | stt->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
327 | if (!stt->pages[i]) | |
328 | goto fail; | |
329 | } | |
330 | ||
47c5310a PM |
331 | ret = fd = anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops, |
332 | stt, O_RDWR | O_CLOEXEC); | |
333 | if (ret < 0) | |
334 | goto fail; | |
f31e65e1 BH |
335 | |
336 | mutex_lock(&kvm->lock); | |
47c5310a PM |
337 | |
338 | /* Check this LIOBN hasn't been previously allocated */ | |
339 | ret = 0; | |
340 | list_for_each_entry(siter, &kvm->arch.spapr_tce_tables, list) { | |
341 | if (siter->liobn == args->liobn) { | |
342 | ret = -EBUSY; | |
343 | break; | |
344 | } | |
345 | } | |
346 | ||
347 | if (!ret) { | |
348 | list_add_rcu(&stt->list, &kvm->arch.spapr_tce_tables); | |
349 | kvm_get_kvm(kvm); | |
350 | } | |
f31e65e1 BH |
351 | |
352 | mutex_unlock(&kvm->lock); | |
353 | ||
47c5310a PM |
354 | if (!ret) |
355 | return fd; | |
f31e65e1 | 356 | |
47c5310a | 357 | put_unused_fd(fd); |
f31e65e1 | 358 | |
47c5310a PM |
359 | fail: |
360 | for (i = 0; i < npages; i++) | |
361 | if (stt->pages[i]) | |
362 | __free_page(stt->pages[i]); | |
363 | ||
364 | kfree(stt); | |
365 | fail_acct: | |
366 | kvmppc_account_memlimit(kvmppc_stt_pages(npages), false); | |
f31e65e1 BH |
367 | return ret; |
368 | } | |
d3695aa4 | 369 | |
121f80ba AK |
370 | static void kvmppc_clear_tce(struct iommu_table *tbl, unsigned long entry) |
371 | { | |
372 | unsigned long hpa = 0; | |
373 | enum dma_data_direction dir = DMA_NONE; | |
374 | ||
375 | iommu_tce_xchg(tbl, entry, &hpa, &dir); | |
376 | } | |
377 | ||
378 | static long kvmppc_tce_iommu_mapped_dec(struct kvm *kvm, | |
379 | struct iommu_table *tbl, unsigned long entry) | |
380 | { | |
381 | struct mm_iommu_table_group_mem_t *mem = NULL; | |
382 | const unsigned long pgsize = 1ULL << tbl->it_page_shift; | |
383 | unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry); | |
384 | ||
385 | if (!pua) | |
386 | /* it_userspace allocation might be delayed */ | |
387 | return H_TOO_HARD; | |
388 | ||
389 | mem = mm_iommu_lookup(kvm->mm, *pua, pgsize); | |
390 | if (!mem) | |
391 | return H_TOO_HARD; | |
392 | ||
393 | mm_iommu_mapped_dec(mem); | |
394 | ||
395 | *pua = 0; | |
396 | ||
397 | return H_SUCCESS; | |
398 | } | |
399 | ||
400 | static long kvmppc_tce_iommu_unmap(struct kvm *kvm, | |
401 | struct iommu_table *tbl, unsigned long entry) | |
402 | { | |
403 | enum dma_data_direction dir = DMA_NONE; | |
404 | unsigned long hpa = 0; | |
405 | long ret; | |
406 | ||
407 | if (WARN_ON_ONCE(iommu_tce_xchg(tbl, entry, &hpa, &dir))) | |
408 | return H_HARDWARE; | |
409 | ||
410 | if (dir == DMA_NONE) | |
411 | return H_SUCCESS; | |
412 | ||
413 | ret = kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry); | |
414 | if (ret != H_SUCCESS) | |
415 | iommu_tce_xchg(tbl, entry, &hpa, &dir); | |
416 | ||
417 | return ret; | |
418 | } | |
419 | ||
420 | long kvmppc_tce_iommu_map(struct kvm *kvm, struct iommu_table *tbl, | |
421 | unsigned long entry, unsigned long ua, | |
422 | enum dma_data_direction dir) | |
423 | { | |
424 | long ret; | |
425 | unsigned long hpa, *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry); | |
426 | struct mm_iommu_table_group_mem_t *mem; | |
427 | ||
428 | if (!pua) | |
429 | /* it_userspace allocation might be delayed */ | |
430 | return H_TOO_HARD; | |
431 | ||
432 | mem = mm_iommu_lookup(kvm->mm, ua, 1ULL << tbl->it_page_shift); | |
433 | if (!mem) | |
434 | /* This only handles v2 IOMMU type, v1 is handled via ioctl() */ | |
435 | return H_TOO_HARD; | |
436 | ||
437 | if (WARN_ON_ONCE(mm_iommu_ua_to_hpa(mem, ua, &hpa))) | |
438 | return H_HARDWARE; | |
439 | ||
440 | if (mm_iommu_mapped_inc(mem)) | |
441 | return H_CLOSED; | |
442 | ||
443 | ret = iommu_tce_xchg(tbl, entry, &hpa, &dir); | |
444 | if (WARN_ON_ONCE(ret)) { | |
445 | mm_iommu_mapped_dec(mem); | |
446 | return H_HARDWARE; | |
447 | } | |
448 | ||
449 | if (dir != DMA_NONE) | |
450 | kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry); | |
451 | ||
452 | *pua = ua; | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
31217db7 AK |
457 | long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn, |
458 | unsigned long ioba, unsigned long tce) | |
459 | { | |
503bfcbe | 460 | struct kvmppc_spapr_tce_table *stt; |
121f80ba AK |
461 | long ret, idx; |
462 | struct kvmppc_spapr_tce_iommu_table *stit; | |
463 | unsigned long entry, ua = 0; | |
464 | enum dma_data_direction dir; | |
31217db7 AK |
465 | |
466 | /* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */ | |
467 | /* liobn, ioba, tce); */ | |
468 | ||
503bfcbe | 469 | stt = kvmppc_find_table(vcpu->kvm, liobn); |
31217db7 AK |
470 | if (!stt) |
471 | return H_TOO_HARD; | |
472 | ||
473 | ret = kvmppc_ioba_validate(stt, ioba, 1); | |
474 | if (ret != H_SUCCESS) | |
475 | return ret; | |
476 | ||
477 | ret = kvmppc_tce_validate(stt, tce); | |
478 | if (ret != H_SUCCESS) | |
479 | return ret; | |
480 | ||
121f80ba AK |
481 | dir = iommu_tce_direction(tce); |
482 | if ((dir != DMA_NONE) && kvmppc_gpa_to_ua(vcpu->kvm, | |
483 | tce & ~(TCE_PCI_READ | TCE_PCI_WRITE), &ua, NULL)) | |
484 | return H_PARAMETER; | |
485 | ||
486 | entry = ioba >> stt->page_shift; | |
487 | ||
488 | list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { | |
489 | if (dir == DMA_NONE) { | |
490 | ret = kvmppc_tce_iommu_unmap(vcpu->kvm, | |
491 | stit->tbl, entry); | |
492 | } else { | |
493 | idx = srcu_read_lock(&vcpu->kvm->srcu); | |
494 | ret = kvmppc_tce_iommu_map(vcpu->kvm, stit->tbl, | |
495 | entry, ua, dir); | |
496 | srcu_read_unlock(&vcpu->kvm->srcu, idx); | |
497 | } | |
498 | ||
499 | if (ret == H_SUCCESS) | |
500 | continue; | |
501 | ||
502 | if (ret == H_TOO_HARD) | |
503 | return ret; | |
504 | ||
505 | WARN_ON_ONCE(1); | |
506 | kvmppc_clear_tce(stit->tbl, entry); | |
507 | } | |
508 | ||
509 | kvmppc_tce_put(stt, entry, tce); | |
31217db7 AK |
510 | |
511 | return H_SUCCESS; | |
512 | } | |
513 | EXPORT_SYMBOL_GPL(kvmppc_h_put_tce); | |
514 | ||
d3695aa4 AK |
515 | long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu, |
516 | unsigned long liobn, unsigned long ioba, | |
517 | unsigned long tce_list, unsigned long npages) | |
518 | { | |
519 | struct kvmppc_spapr_tce_table *stt; | |
520 | long i, ret = H_SUCCESS, idx; | |
521 | unsigned long entry, ua = 0; | |
f8750513 DA |
522 | u64 __user *tces; |
523 | u64 tce; | |
121f80ba | 524 | struct kvmppc_spapr_tce_iommu_table *stit; |
d3695aa4 | 525 | |
503bfcbe | 526 | stt = kvmppc_find_table(vcpu->kvm, liobn); |
d3695aa4 AK |
527 | if (!stt) |
528 | return H_TOO_HARD; | |
529 | ||
fe26e527 | 530 | entry = ioba >> stt->page_shift; |
d3695aa4 AK |
531 | /* |
532 | * SPAPR spec says that the maximum size of the list is 512 TCEs | |
533 | * so the whole table fits in 4K page | |
534 | */ | |
535 | if (npages > 512) | |
536 | return H_PARAMETER; | |
537 | ||
538 | if (tce_list & (SZ_4K - 1)) | |
539 | return H_PARAMETER; | |
540 | ||
541 | ret = kvmppc_ioba_validate(stt, ioba, npages); | |
542 | if (ret != H_SUCCESS) | |
543 | return ret; | |
544 | ||
545 | idx = srcu_read_lock(&vcpu->kvm->srcu); | |
546 | if (kvmppc_gpa_to_ua(vcpu->kvm, tce_list, &ua, NULL)) { | |
547 | ret = H_TOO_HARD; | |
548 | goto unlock_exit; | |
549 | } | |
550 | tces = (u64 __user *) ua; | |
551 | ||
552 | for (i = 0; i < npages; ++i) { | |
553 | if (get_user(tce, tces + i)) { | |
554 | ret = H_TOO_HARD; | |
555 | goto unlock_exit; | |
556 | } | |
557 | tce = be64_to_cpu(tce); | |
558 | ||
559 | ret = kvmppc_tce_validate(stt, tce); | |
560 | if (ret != H_SUCCESS) | |
561 | goto unlock_exit; | |
562 | ||
121f80ba AK |
563 | if (kvmppc_gpa_to_ua(vcpu->kvm, |
564 | tce & ~(TCE_PCI_READ | TCE_PCI_WRITE), | |
565 | &ua, NULL)) | |
566 | return H_PARAMETER; | |
567 | ||
568 | list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { | |
569 | ret = kvmppc_tce_iommu_map(vcpu->kvm, | |
570 | stit->tbl, entry + i, ua, | |
571 | iommu_tce_direction(tce)); | |
572 | ||
573 | if (ret == H_SUCCESS) | |
574 | continue; | |
575 | ||
576 | if (ret == H_TOO_HARD) | |
577 | goto unlock_exit; | |
578 | ||
579 | WARN_ON_ONCE(1); | |
580 | kvmppc_clear_tce(stit->tbl, entry); | |
581 | } | |
582 | ||
d3695aa4 AK |
583 | kvmppc_tce_put(stt, entry + i, tce); |
584 | } | |
585 | ||
586 | unlock_exit: | |
587 | srcu_read_unlock(&vcpu->kvm->srcu, idx); | |
588 | ||
589 | return ret; | |
590 | } | |
591 | EXPORT_SYMBOL_GPL(kvmppc_h_put_tce_indirect); | |
31217db7 AK |
592 | |
593 | long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu, | |
594 | unsigned long liobn, unsigned long ioba, | |
595 | unsigned long tce_value, unsigned long npages) | |
596 | { | |
597 | struct kvmppc_spapr_tce_table *stt; | |
598 | long i, ret; | |
121f80ba | 599 | struct kvmppc_spapr_tce_iommu_table *stit; |
31217db7 | 600 | |
503bfcbe | 601 | stt = kvmppc_find_table(vcpu->kvm, liobn); |
31217db7 AK |
602 | if (!stt) |
603 | return H_TOO_HARD; | |
604 | ||
605 | ret = kvmppc_ioba_validate(stt, ioba, npages); | |
606 | if (ret != H_SUCCESS) | |
607 | return ret; | |
608 | ||
609 | /* Check permission bits only to allow userspace poison TCE for debug */ | |
610 | if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ)) | |
611 | return H_PARAMETER; | |
612 | ||
121f80ba AK |
613 | list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { |
614 | unsigned long entry = ioba >> stit->tbl->it_page_shift; | |
615 | ||
616 | for (i = 0; i < npages; ++i) { | |
617 | ret = kvmppc_tce_iommu_unmap(vcpu->kvm, | |
618 | stit->tbl, entry + i); | |
619 | ||
620 | if (ret == H_SUCCESS) | |
621 | continue; | |
622 | ||
623 | if (ret == H_TOO_HARD) | |
624 | return ret; | |
625 | ||
626 | WARN_ON_ONCE(1); | |
627 | kvmppc_clear_tce(stit->tbl, entry); | |
628 | } | |
629 | } | |
630 | ||
31217db7 AK |
631 | for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift)) |
632 | kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value); | |
633 | ||
634 | return H_SUCCESS; | |
635 | } | |
636 | EXPORT_SYMBOL_GPL(kvmppc_h_stuff_tce); |