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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); | |
121f80ba AK |
137 | } |
138 | } | |
139 | } | |
140 | } | |
141 | ||
142 | extern long kvm_spapr_tce_attach_iommu_group(struct kvm *kvm, int tablefd, | |
143 | struct iommu_group *grp) | |
144 | { | |
145 | struct kvmppc_spapr_tce_table *stt = NULL; | |
146 | bool found = false; | |
147 | struct iommu_table *tbl = NULL; | |
148 | struct iommu_table_group *table_group; | |
149 | long i; | |
150 | struct kvmppc_spapr_tce_iommu_table *stit; | |
151 | struct fd f; | |
152 | ||
153 | f = fdget(tablefd); | |
154 | if (!f.file) | |
155 | return -EBADF; | |
156 | ||
157 | list_for_each_entry_rcu(stt, &kvm->arch.spapr_tce_tables, list) { | |
158 | if (stt == f.file->private_data) { | |
159 | found = true; | |
160 | break; | |
161 | } | |
162 | } | |
163 | ||
164 | fdput(f); | |
165 | ||
166 | if (!found) | |
167 | return -EINVAL; | |
168 | ||
169 | table_group = iommu_group_get_iommudata(grp); | |
170 | if (WARN_ON(!table_group)) | |
171 | return -EFAULT; | |
172 | ||
173 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
174 | struct iommu_table *tbltmp = table_group->tables[i]; | |
175 | ||
176 | if (!tbltmp) | |
177 | continue; | |
178 | /* | |
179 | * Make sure hardware table parameters are exactly the same; | |
180 | * this is used in the TCE handlers where boundary checks | |
181 | * use only the first attached table. | |
182 | */ | |
183 | if ((tbltmp->it_page_shift == stt->page_shift) && | |
184 | (tbltmp->it_offset == stt->offset) && | |
185 | (tbltmp->it_size == stt->size)) { | |
186 | /* | |
187 | * Reference the table to avoid races with | |
188 | * add/remove DMA windows. | |
189 | */ | |
190 | tbl = iommu_tce_table_get(tbltmp); | |
191 | break; | |
192 | } | |
193 | } | |
194 | if (!tbl) | |
195 | return -EINVAL; | |
196 | ||
197 | list_for_each_entry_rcu(stit, &stt->iommu_tables, next) { | |
198 | if (tbl != stit->tbl) | |
199 | continue; | |
200 | ||
201 | if (!kref_get_unless_zero(&stit->kref)) { | |
202 | /* stit is being destroyed */ | |
203 | iommu_tce_table_put(tbl); | |
204 | return -ENOTTY; | |
205 | } | |
206 | /* | |
207 | * The table is already known to this KVM, we just increased | |
208 | * its KVM reference counter and can return. | |
209 | */ | |
210 | return 0; | |
211 | } | |
212 | ||
213 | stit = kzalloc(sizeof(*stit), GFP_KERNEL); | |
214 | if (!stit) { | |
215 | iommu_tce_table_put(tbl); | |
216 | return -ENOMEM; | |
217 | } | |
218 | ||
219 | stit->tbl = tbl; | |
220 | kref_init(&stit->kref); | |
221 | ||
222 | list_add_rcu(&stit->next, &stt->iommu_tables); | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
366baf28 | 227 | static void release_spapr_tce_table(struct rcu_head *head) |
f31e65e1 | 228 | { |
366baf28 AK |
229 | struct kvmppc_spapr_tce_table *stt = container_of(head, |
230 | struct kvmppc_spapr_tce_table, rcu); | |
fe26e527 | 231 | unsigned long i, npages = kvmppc_tce_pages(stt->size); |
f31e65e1 | 232 | |
f8626985 | 233 | for (i = 0; i < npages; i++) |
f31e65e1 | 234 | __free_page(stt->pages[i]); |
f31e65e1 | 235 | |
366baf28 | 236 | kfree(stt); |
f31e65e1 BH |
237 | } |
238 | ||
11bac800 | 239 | static int kvm_spapr_tce_fault(struct vm_fault *vmf) |
f31e65e1 | 240 | { |
11bac800 | 241 | struct kvmppc_spapr_tce_table *stt = vmf->vma->vm_file->private_data; |
f31e65e1 BH |
242 | struct page *page; |
243 | ||
fe26e527 | 244 | if (vmf->pgoff >= kvmppc_tce_pages(stt->size)) |
f31e65e1 BH |
245 | return VM_FAULT_SIGBUS; |
246 | ||
247 | page = stt->pages[vmf->pgoff]; | |
248 | get_page(page); | |
249 | vmf->page = page; | |
250 | return 0; | |
251 | } | |
252 | ||
253 | static const struct vm_operations_struct kvm_spapr_tce_vm_ops = { | |
254 | .fault = kvm_spapr_tce_fault, | |
255 | }; | |
256 | ||
257 | static int kvm_spapr_tce_mmap(struct file *file, struct vm_area_struct *vma) | |
258 | { | |
259 | vma->vm_ops = &kvm_spapr_tce_vm_ops; | |
260 | return 0; | |
261 | } | |
262 | ||
263 | static int kvm_spapr_tce_release(struct inode *inode, struct file *filp) | |
264 | { | |
265 | struct kvmppc_spapr_tce_table *stt = filp->private_data; | |
121f80ba | 266 | struct kvmppc_spapr_tce_iommu_table *stit, *tmp; |
edd03602 | 267 | struct kvm *kvm = stt->kvm; |
f31e65e1 | 268 | |
edd03602 | 269 | mutex_lock(&kvm->lock); |
366baf28 | 270 | list_del_rcu(&stt->list); |
edd03602 | 271 | mutex_unlock(&kvm->lock); |
366baf28 | 272 | |
121f80ba AK |
273 | list_for_each_entry_safe(stit, tmp, &stt->iommu_tables, next) { |
274 | WARN_ON(!kref_read(&stit->kref)); | |
275 | while (1) { | |
276 | if (kref_put(&stit->kref, kvm_spapr_tce_liobn_put)) | |
277 | break; | |
278 | } | |
279 | } | |
280 | ||
366baf28 AK |
281 | kvm_put_kvm(stt->kvm); |
282 | ||
f8626985 | 283 | kvmppc_account_memlimit( |
fe26e527 | 284 | kvmppc_stt_pages(kvmppc_tce_pages(stt->size)), false); |
366baf28 AK |
285 | call_rcu(&stt->rcu, release_spapr_tce_table); |
286 | ||
f31e65e1 BH |
287 | return 0; |
288 | } | |
289 | ||
75ef9de1 | 290 | static const struct file_operations kvm_spapr_tce_fops = { |
f31e65e1 BH |
291 | .mmap = kvm_spapr_tce_mmap, |
292 | .release = kvm_spapr_tce_release, | |
293 | }; | |
294 | ||
295 | long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm, | |
58ded420 | 296 | struct kvm_create_spapr_tce_64 *args) |
f31e65e1 BH |
297 | { |
298 | struct kvmppc_spapr_tce_table *stt = NULL; | |
47c5310a | 299 | struct kvmppc_spapr_tce_table *siter; |
fe26e527 | 300 | unsigned long npages, size; |
f31e65e1 BH |
301 | int ret = -ENOMEM; |
302 | int i; | |
303 | ||
58ded420 AK |
304 | if (!args->size) |
305 | return -EINVAL; | |
306 | ||
3762d45a | 307 | size = _ALIGN_UP(args->size, PAGE_SIZE >> 3); |
fe26e527 | 308 | npages = kvmppc_tce_pages(size); |
f8626985 | 309 | ret = kvmppc_account_memlimit(kvmppc_stt_pages(npages), true); |
47c5310a PM |
310 | if (ret) |
311 | return ret; | |
f31e65e1 | 312 | |
5982f084 | 313 | ret = -ENOMEM; |
f31e65e1 BH |
314 | stt = kzalloc(sizeof(*stt) + npages * sizeof(struct page *), |
315 | GFP_KERNEL); | |
316 | if (!stt) | |
47c5310a | 317 | goto fail_acct; |
f31e65e1 BH |
318 | |
319 | stt->liobn = args->liobn; | |
58ded420 AK |
320 | stt->page_shift = args->page_shift; |
321 | stt->offset = args->offset; | |
fe26e527 | 322 | stt->size = size; |
f31e65e1 | 323 | stt->kvm = kvm; |
121f80ba | 324 | INIT_LIST_HEAD_RCU(&stt->iommu_tables); |
f31e65e1 BH |
325 | |
326 | for (i = 0; i < npages; i++) { | |
327 | stt->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
328 | if (!stt->pages[i]) | |
329 | goto fail; | |
330 | } | |
331 | ||
f31e65e1 | 332 | mutex_lock(&kvm->lock); |
47c5310a PM |
333 | |
334 | /* Check this LIOBN hasn't been previously allocated */ | |
335 | ret = 0; | |
336 | list_for_each_entry(siter, &kvm->arch.spapr_tce_tables, list) { | |
337 | if (siter->liobn == args->liobn) { | |
338 | ret = -EBUSY; | |
339 | break; | |
340 | } | |
341 | } | |
342 | ||
edd03602 PM |
343 | if (!ret) |
344 | ret = anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops, | |
345 | stt, O_RDWR | O_CLOEXEC); | |
346 | ||
347 | if (ret >= 0) { | |
47c5310a PM |
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 | ||
edd03602 PM |
354 | if (ret >= 0) |
355 | return ret; | |
f31e65e1 | 356 | |
47c5310a PM |
357 | fail: |
358 | for (i = 0; i < npages; i++) | |
359 | if (stt->pages[i]) | |
360 | __free_page(stt->pages[i]); | |
361 | ||
362 | kfree(stt); | |
363 | fail_acct: | |
364 | kvmppc_account_memlimit(kvmppc_stt_pages(npages), false); | |
f31e65e1 BH |
365 | return ret; |
366 | } | |
d3695aa4 | 367 | |
121f80ba AK |
368 | static void kvmppc_clear_tce(struct iommu_table *tbl, unsigned long entry) |
369 | { | |
370 | unsigned long hpa = 0; | |
371 | enum dma_data_direction dir = DMA_NONE; | |
372 | ||
373 | iommu_tce_xchg(tbl, entry, &hpa, &dir); | |
374 | } | |
375 | ||
376 | static long kvmppc_tce_iommu_mapped_dec(struct kvm *kvm, | |
377 | struct iommu_table *tbl, unsigned long entry) | |
378 | { | |
379 | struct mm_iommu_table_group_mem_t *mem = NULL; | |
380 | const unsigned long pgsize = 1ULL << tbl->it_page_shift; | |
381 | unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry); | |
382 | ||
383 | if (!pua) | |
384 | /* it_userspace allocation might be delayed */ | |
385 | return H_TOO_HARD; | |
386 | ||
387 | mem = mm_iommu_lookup(kvm->mm, *pua, pgsize); | |
388 | if (!mem) | |
389 | return H_TOO_HARD; | |
390 | ||
391 | mm_iommu_mapped_dec(mem); | |
392 | ||
393 | *pua = 0; | |
394 | ||
395 | return H_SUCCESS; | |
396 | } | |
397 | ||
398 | static long kvmppc_tce_iommu_unmap(struct kvm *kvm, | |
399 | struct iommu_table *tbl, unsigned long entry) | |
400 | { | |
401 | enum dma_data_direction dir = DMA_NONE; | |
402 | unsigned long hpa = 0; | |
403 | long ret; | |
404 | ||
405 | if (WARN_ON_ONCE(iommu_tce_xchg(tbl, entry, &hpa, &dir))) | |
adf4ba3f | 406 | return H_TOO_HARD; |
121f80ba AK |
407 | |
408 | if (dir == DMA_NONE) | |
409 | return H_SUCCESS; | |
410 | ||
411 | ret = kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry); | |
412 | if (ret != H_SUCCESS) | |
413 | iommu_tce_xchg(tbl, entry, &hpa, &dir); | |
414 | ||
415 | return ret; | |
416 | } | |
417 | ||
418 | long kvmppc_tce_iommu_map(struct kvm *kvm, struct iommu_table *tbl, | |
419 | unsigned long entry, unsigned long ua, | |
420 | enum dma_data_direction dir) | |
421 | { | |
422 | long ret; | |
423 | unsigned long hpa, *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry); | |
424 | struct mm_iommu_table_group_mem_t *mem; | |
425 | ||
426 | if (!pua) | |
427 | /* it_userspace allocation might be delayed */ | |
428 | return H_TOO_HARD; | |
429 | ||
430 | mem = mm_iommu_lookup(kvm->mm, ua, 1ULL << tbl->it_page_shift); | |
431 | if (!mem) | |
432 | /* This only handles v2 IOMMU type, v1 is handled via ioctl() */ | |
433 | return H_TOO_HARD; | |
434 | ||
11cdaf61 | 435 | if (WARN_ON_ONCE(mm_iommu_ua_to_hpa(mem, ua, tbl->it_page_shift, &hpa))) |
adf4ba3f | 436 | return H_TOO_HARD; |
121f80ba AK |
437 | |
438 | if (mm_iommu_mapped_inc(mem)) | |
adf4ba3f | 439 | return H_TOO_HARD; |
121f80ba AK |
440 | |
441 | ret = iommu_tce_xchg(tbl, entry, &hpa, &dir); | |
442 | if (WARN_ON_ONCE(ret)) { | |
443 | mm_iommu_mapped_dec(mem); | |
adf4ba3f | 444 | return H_TOO_HARD; |
121f80ba AK |
445 | } |
446 | ||
447 | if (dir != DMA_NONE) | |
448 | kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry); | |
449 | ||
450 | *pua = ua; | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
31217db7 AK |
455 | long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn, |
456 | unsigned long ioba, unsigned long tce) | |
457 | { | |
503bfcbe | 458 | struct kvmppc_spapr_tce_table *stt; |
121f80ba AK |
459 | long ret, idx; |
460 | struct kvmppc_spapr_tce_iommu_table *stit; | |
461 | unsigned long entry, ua = 0; | |
462 | enum dma_data_direction dir; | |
31217db7 AK |
463 | |
464 | /* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */ | |
465 | /* liobn, ioba, tce); */ | |
466 | ||
503bfcbe | 467 | stt = kvmppc_find_table(vcpu->kvm, liobn); |
31217db7 AK |
468 | if (!stt) |
469 | return H_TOO_HARD; | |
470 | ||
471 | ret = kvmppc_ioba_validate(stt, ioba, 1); | |
472 | if (ret != H_SUCCESS) | |
473 | return ret; | |
474 | ||
475 | ret = kvmppc_tce_validate(stt, tce); | |
476 | if (ret != H_SUCCESS) | |
477 | return ret; | |
478 | ||
121f80ba | 479 | dir = iommu_tce_direction(tce); |
8f6a9f0d AK |
480 | |
481 | idx = srcu_read_lock(&vcpu->kvm->srcu); | |
482 | ||
121f80ba | 483 | if ((dir != DMA_NONE) && kvmppc_gpa_to_ua(vcpu->kvm, |
8f6a9f0d AK |
484 | tce & ~(TCE_PCI_READ | TCE_PCI_WRITE), &ua, NULL)) { |
485 | ret = H_PARAMETER; | |
486 | goto unlock_exit; | |
487 | } | |
121f80ba AK |
488 | |
489 | entry = ioba >> stt->page_shift; | |
490 | ||
491 | list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { | |
8f6a9f0d | 492 | if (dir == DMA_NONE) |
121f80ba AK |
493 | ret = kvmppc_tce_iommu_unmap(vcpu->kvm, |
494 | stit->tbl, entry); | |
8f6a9f0d | 495 | else |
121f80ba AK |
496 | ret = kvmppc_tce_iommu_map(vcpu->kvm, stit->tbl, |
497 | entry, ua, dir); | |
121f80ba AK |
498 | |
499 | if (ret == H_SUCCESS) | |
500 | continue; | |
501 | ||
502 | if (ret == H_TOO_HARD) | |
8f6a9f0d | 503 | goto unlock_exit; |
121f80ba AK |
504 | |
505 | WARN_ON_ONCE(1); | |
506 | kvmppc_clear_tce(stit->tbl, entry); | |
507 | } | |
508 | ||
509 | kvmppc_tce_put(stt, entry, tce); | |
31217db7 | 510 | |
8f6a9f0d AK |
511 | unlock_exit: |
512 | srcu_read_unlock(&vcpu->kvm->srcu, idx); | |
513 | ||
514 | return ret; | |
31217db7 AK |
515 | } |
516 | EXPORT_SYMBOL_GPL(kvmppc_h_put_tce); | |
517 | ||
d3695aa4 AK |
518 | long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu, |
519 | unsigned long liobn, unsigned long ioba, | |
520 | unsigned long tce_list, unsigned long npages) | |
521 | { | |
522 | struct kvmppc_spapr_tce_table *stt; | |
523 | long i, ret = H_SUCCESS, idx; | |
524 | unsigned long entry, ua = 0; | |
f8750513 DA |
525 | u64 __user *tces; |
526 | u64 tce; | |
121f80ba | 527 | struct kvmppc_spapr_tce_iommu_table *stit; |
d3695aa4 | 528 | |
503bfcbe | 529 | stt = kvmppc_find_table(vcpu->kvm, liobn); |
d3695aa4 AK |
530 | if (!stt) |
531 | return H_TOO_HARD; | |
532 | ||
fe26e527 | 533 | entry = ioba >> stt->page_shift; |
d3695aa4 AK |
534 | /* |
535 | * SPAPR spec says that the maximum size of the list is 512 TCEs | |
536 | * so the whole table fits in 4K page | |
537 | */ | |
538 | if (npages > 512) | |
539 | return H_PARAMETER; | |
540 | ||
541 | if (tce_list & (SZ_4K - 1)) | |
542 | return H_PARAMETER; | |
543 | ||
544 | ret = kvmppc_ioba_validate(stt, ioba, npages); | |
545 | if (ret != H_SUCCESS) | |
546 | return ret; | |
547 | ||
548 | idx = srcu_read_lock(&vcpu->kvm->srcu); | |
549 | if (kvmppc_gpa_to_ua(vcpu->kvm, tce_list, &ua, NULL)) { | |
550 | ret = H_TOO_HARD; | |
551 | goto unlock_exit; | |
552 | } | |
553 | tces = (u64 __user *) ua; | |
554 | ||
555 | for (i = 0; i < npages; ++i) { | |
556 | if (get_user(tce, tces + i)) { | |
557 | ret = H_TOO_HARD; | |
558 | goto unlock_exit; | |
559 | } | |
560 | tce = be64_to_cpu(tce); | |
561 | ||
562 | ret = kvmppc_tce_validate(stt, tce); | |
563 | if (ret != H_SUCCESS) | |
564 | goto unlock_exit; | |
565 | ||
121f80ba AK |
566 | if (kvmppc_gpa_to_ua(vcpu->kvm, |
567 | tce & ~(TCE_PCI_READ | TCE_PCI_WRITE), | |
d9febbae AK |
568 | &ua, NULL)) { |
569 | ret = H_PARAMETER; | |
570 | goto unlock_exit; | |
571 | } | |
121f80ba AK |
572 | |
573 | list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { | |
574 | ret = kvmppc_tce_iommu_map(vcpu->kvm, | |
575 | stit->tbl, entry + i, ua, | |
576 | iommu_tce_direction(tce)); | |
577 | ||
578 | if (ret == H_SUCCESS) | |
579 | continue; | |
580 | ||
581 | if (ret == H_TOO_HARD) | |
582 | goto unlock_exit; | |
583 | ||
584 | WARN_ON_ONCE(1); | |
585 | kvmppc_clear_tce(stit->tbl, entry); | |
586 | } | |
587 | ||
d3695aa4 AK |
588 | kvmppc_tce_put(stt, entry + i, tce); |
589 | } | |
590 | ||
591 | unlock_exit: | |
592 | srcu_read_unlock(&vcpu->kvm->srcu, idx); | |
593 | ||
594 | return ret; | |
595 | } | |
596 | EXPORT_SYMBOL_GPL(kvmppc_h_put_tce_indirect); | |
31217db7 AK |
597 | |
598 | long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu, | |
599 | unsigned long liobn, unsigned long ioba, | |
600 | unsigned long tce_value, unsigned long npages) | |
601 | { | |
602 | struct kvmppc_spapr_tce_table *stt; | |
603 | long i, ret; | |
121f80ba | 604 | struct kvmppc_spapr_tce_iommu_table *stit; |
31217db7 | 605 | |
503bfcbe | 606 | stt = kvmppc_find_table(vcpu->kvm, liobn); |
31217db7 AK |
607 | if (!stt) |
608 | return H_TOO_HARD; | |
609 | ||
610 | ret = kvmppc_ioba_validate(stt, ioba, npages); | |
611 | if (ret != H_SUCCESS) | |
612 | return ret; | |
613 | ||
614 | /* Check permission bits only to allow userspace poison TCE for debug */ | |
615 | if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ)) | |
616 | return H_PARAMETER; | |
617 | ||
121f80ba AK |
618 | list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { |
619 | unsigned long entry = ioba >> stit->tbl->it_page_shift; | |
620 | ||
621 | for (i = 0; i < npages; ++i) { | |
622 | ret = kvmppc_tce_iommu_unmap(vcpu->kvm, | |
623 | stit->tbl, entry + i); | |
624 | ||
625 | if (ret == H_SUCCESS) | |
626 | continue; | |
627 | ||
628 | if (ret == H_TOO_HARD) | |
629 | return ret; | |
630 | ||
631 | WARN_ON_ONCE(1); | |
632 | kvmppc_clear_tce(stit->tbl, entry); | |
633 | } | |
634 | } | |
635 | ||
31217db7 AK |
636 | for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift)) |
637 | kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value); | |
638 | ||
639 | return H_SUCCESS; | |
640 | } | |
641 | EXPORT_SYMBOL_GPL(kvmppc_h_stuff_tce); |