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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; |
edd03602 | 268 | struct kvm *kvm = stt->kvm; |
f31e65e1 | 269 | |
edd03602 | 270 | mutex_lock(&kvm->lock); |
366baf28 | 271 | list_del_rcu(&stt->list); |
edd03602 | 272 | mutex_unlock(&kvm->lock); |
366baf28 | 273 | |
121f80ba AK |
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 | ||
366baf28 AK |
282 | kvm_put_kvm(stt->kvm); |
283 | ||
f8626985 | 284 | kvmppc_account_memlimit( |
fe26e527 | 285 | kvmppc_stt_pages(kvmppc_tce_pages(stt->size)), false); |
366baf28 AK |
286 | call_rcu(&stt->rcu, release_spapr_tce_table); |
287 | ||
f31e65e1 BH |
288 | return 0; |
289 | } | |
290 | ||
75ef9de1 | 291 | static const struct file_operations kvm_spapr_tce_fops = { |
f31e65e1 BH |
292 | .mmap = kvm_spapr_tce_mmap, |
293 | .release = kvm_spapr_tce_release, | |
294 | }; | |
295 | ||
296 | long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm, | |
58ded420 | 297 | struct kvm_create_spapr_tce_64 *args) |
f31e65e1 BH |
298 | { |
299 | struct kvmppc_spapr_tce_table *stt = NULL; | |
47c5310a | 300 | struct kvmppc_spapr_tce_table *siter; |
fe26e527 | 301 | unsigned long npages, size; |
f31e65e1 BH |
302 | int ret = -ENOMEM; |
303 | int i; | |
304 | ||
58ded420 AK |
305 | if (!args->size) |
306 | return -EINVAL; | |
307 | ||
3762d45a | 308 | size = _ALIGN_UP(args->size, PAGE_SIZE >> 3); |
fe26e527 | 309 | npages = kvmppc_tce_pages(size); |
f8626985 | 310 | ret = kvmppc_account_memlimit(kvmppc_stt_pages(npages), true); |
47c5310a PM |
311 | if (ret) |
312 | return ret; | |
f31e65e1 | 313 | |
5982f084 | 314 | ret = -ENOMEM; |
f31e65e1 BH |
315 | stt = kzalloc(sizeof(*stt) + npages * sizeof(struct page *), |
316 | GFP_KERNEL); | |
317 | if (!stt) | |
47c5310a | 318 | goto fail_acct; |
f31e65e1 BH |
319 | |
320 | stt->liobn = args->liobn; | |
58ded420 AK |
321 | stt->page_shift = args->page_shift; |
322 | stt->offset = args->offset; | |
fe26e527 | 323 | stt->size = size; |
f31e65e1 | 324 | stt->kvm = kvm; |
121f80ba | 325 | INIT_LIST_HEAD_RCU(&stt->iommu_tables); |
f31e65e1 BH |
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 | ||
f31e65e1 | 333 | mutex_lock(&kvm->lock); |
47c5310a PM |
334 | |
335 | /* Check this LIOBN hasn't been previously allocated */ | |
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 | ||
edd03602 PM |
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) { | |
47c5310a PM |
349 | list_add_rcu(&stt->list, &kvm->arch.spapr_tce_tables); |
350 | kvm_get_kvm(kvm); | |
351 | } | |
f31e65e1 BH |
352 | |
353 | mutex_unlock(&kvm->lock); | |
354 | ||
edd03602 PM |
355 | if (ret >= 0) |
356 | return ret; | |
f31e65e1 | 357 | |
47c5310a PM |
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); | |
f31e65e1 BH |
366 | return ret; |
367 | } | |
d3695aa4 | 368 | |
121f80ba AK |
369 | static 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 | ||
377 | static 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 | /* it_userspace allocation might be delayed */ | |
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 | ||
399 | static 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 | ||
419 | long 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 | /* it_userspace allocation might be delayed */ | |
429 | return H_TOO_HARD; | |
430 | ||
431 | mem = mm_iommu_lookup(kvm->mm, ua, 1ULL << tbl->it_page_shift); | |
432 | if (!mem) | |
433 | /* This only handles v2 IOMMU type, v1 is handled via ioctl() */ | |
434 | return H_TOO_HARD; | |
435 | ||
11cdaf61 | 436 | if (WARN_ON_ONCE(mm_iommu_ua_to_hpa(mem, ua, tbl->it_page_shift, &hpa))) |
121f80ba AK |
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 | ||
31217db7 AK |
456 | long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn, |
457 | unsigned long ioba, unsigned long tce) | |
458 | { | |
503bfcbe | 459 | struct kvmppc_spapr_tce_table *stt; |
121f80ba AK |
460 | long ret, idx; |
461 | struct kvmppc_spapr_tce_iommu_table *stit; | |
462 | unsigned long entry, ua = 0; | |
463 | enum dma_data_direction dir; | |
31217db7 AK |
464 | |
465 | /* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */ | |
466 | /* liobn, ioba, tce); */ | |
467 | ||
503bfcbe | 468 | stt = kvmppc_find_table(vcpu->kvm, liobn); |
31217db7 AK |
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 | ||
121f80ba | 480 | dir = iommu_tce_direction(tce); |
8f6a9f0d AK |
481 | |
482 | idx = srcu_read_lock(&vcpu->kvm->srcu); | |
483 | ||
121f80ba | 484 | if ((dir != DMA_NONE) && kvmppc_gpa_to_ua(vcpu->kvm, |
8f6a9f0d AK |
485 | tce & ~(TCE_PCI_READ | TCE_PCI_WRITE), &ua, NULL)) { |
486 | ret = H_PARAMETER; | |
487 | goto unlock_exit; | |
488 | } | |
121f80ba AK |
489 | |
490 | entry = ioba >> stt->page_shift; | |
491 | ||
492 | list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { | |
8f6a9f0d | 493 | if (dir == DMA_NONE) |
121f80ba AK |
494 | ret = kvmppc_tce_iommu_unmap(vcpu->kvm, |
495 | stit->tbl, entry); | |
8f6a9f0d | 496 | else |
121f80ba AK |
497 | ret = kvmppc_tce_iommu_map(vcpu->kvm, stit->tbl, |
498 | entry, ua, dir); | |
121f80ba AK |
499 | |
500 | if (ret == H_SUCCESS) | |
501 | continue; | |
502 | ||
503 | if (ret == H_TOO_HARD) | |
8f6a9f0d | 504 | goto unlock_exit; |
121f80ba AK |
505 | |
506 | WARN_ON_ONCE(1); | |
507 | kvmppc_clear_tce(stit->tbl, entry); | |
508 | } | |
509 | ||
510 | kvmppc_tce_put(stt, entry, tce); | |
31217db7 | 511 | |
8f6a9f0d AK |
512 | unlock_exit: |
513 | srcu_read_unlock(&vcpu->kvm->srcu, idx); | |
514 | ||
515 | return ret; | |
31217db7 AK |
516 | } |
517 | EXPORT_SYMBOL_GPL(kvmppc_h_put_tce); | |
518 | ||
d3695aa4 AK |
519 | long 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; | |
f8750513 DA |
526 | u64 __user *tces; |
527 | u64 tce; | |
121f80ba | 528 | struct kvmppc_spapr_tce_iommu_table *stit; |
d3695aa4 | 529 | |
503bfcbe | 530 | stt = kvmppc_find_table(vcpu->kvm, liobn); |
d3695aa4 AK |
531 | if (!stt) |
532 | return H_TOO_HARD; | |
533 | ||
fe26e527 | 534 | entry = ioba >> stt->page_shift; |
d3695aa4 AK |
535 | /* |
536 | * SPAPR spec says that the maximum size of the list is 512 TCEs | |
537 | * so the whole table fits in 4K page | |
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 | ||
121f80ba AK |
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 | ||
d3695aa4 AK |
587 | kvmppc_tce_put(stt, entry + i, tce); |
588 | } | |
589 | ||
590 | unlock_exit: | |
591 | srcu_read_unlock(&vcpu->kvm->srcu, idx); | |
592 | ||
593 | return ret; | |
594 | } | |
595 | EXPORT_SYMBOL_GPL(kvmppc_h_put_tce_indirect); | |
31217db7 AK |
596 | |
597 | long 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; | |
121f80ba | 603 | struct kvmppc_spapr_tce_iommu_table *stit; |
31217db7 | 604 | |
503bfcbe | 605 | stt = kvmppc_find_table(vcpu->kvm, liobn); |
31217db7 AK |
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 | /* Check permission bits only to allow userspace poison TCE for debug */ | |
614 | if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ)) | |
615 | return H_PARAMETER; | |
616 | ||
121f80ba AK |
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 | ||
31217db7 AK |
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 | } | |
640 | EXPORT_SYMBOL_GPL(kvmppc_h_stuff_tce); |