1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 4 * Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> 5 * Copyright 2011 David Gibson, IBM Corporation <dwg@au1.ibm.com> 6 * Copyright 2016 Alexey Kardashevskiy, IBM Corporation <aik@au1.ibm.com> 7 */ 8 9 #include <linux/types.h> 10 #include <linux/string.h> 11 #include <linux/kvm.h> 12 #include <linux/kvm_host.h> 13 #include <linux/highmem.h> 14 #include <linux/gfp.h> 15 #include <linux/slab.h> 16 #include <linux/sched/signal.h> 17 #include <linux/hugetlb.h> 18 #include <linux/list.h> 19 #include <linux/anon_inodes.h> 20 #include <linux/iommu.h> 21 #include <linux/file.h> 22 #include <linux/mm.h> 23 24 #include <asm/kvm_ppc.h> 25 #include <asm/kvm_book3s.h> 26 #include <asm/book3s/64/mmu-hash.h> 27 #include <asm/hvcall.h> 28 #include <asm/synch.h> 29 #include <asm/ppc-opcode.h> 30 #include <asm/kvm_host.h> 31 #include <asm/udbg.h> 32 #include <asm/iommu.h> 33 #include <asm/tce.h> 34 #include <asm/mmu_context.h> 35 36 static unsigned long kvmppc_tce_pages(unsigned long iommu_pages) 37 { 38 return ALIGN(iommu_pages * sizeof(u64), PAGE_SIZE) / PAGE_SIZE; 39 } 40 41 static unsigned long kvmppc_stt_pages(unsigned long tce_pages) 42 { 43 unsigned long stt_bytes = sizeof(struct kvmppc_spapr_tce_table) + 44 (tce_pages * sizeof(struct page *)); 45 46 return tce_pages + ALIGN(stt_bytes, PAGE_SIZE) / PAGE_SIZE; 47 } 48 49 static void kvm_spapr_tce_iommu_table_free(struct rcu_head *head) 50 { 51 struct kvmppc_spapr_tce_iommu_table *stit = container_of(head, 52 struct kvmppc_spapr_tce_iommu_table, rcu); 53 54 iommu_tce_table_put(stit->tbl); 55 56 kfree(stit); 57 } 58 59 static void kvm_spapr_tce_liobn_put(struct kref *kref) 60 { 61 struct kvmppc_spapr_tce_iommu_table *stit = container_of(kref, 62 struct kvmppc_spapr_tce_iommu_table, kref); 63 64 list_del_rcu(&stit->next); 65 66 call_rcu(&stit->rcu, kvm_spapr_tce_iommu_table_free); 67 } 68 69 extern void kvm_spapr_tce_release_iommu_group(struct kvm *kvm, 70 struct iommu_group *grp) 71 { 72 int i; 73 struct kvmppc_spapr_tce_table *stt; 74 struct kvmppc_spapr_tce_iommu_table *stit, *tmp; 75 struct iommu_table_group *table_group = NULL; 76 77 list_for_each_entry_rcu(stt, &kvm->arch.spapr_tce_tables, list) { 78 79 table_group = iommu_group_get_iommudata(grp); 80 if (WARN_ON(!table_group)) 81 continue; 82 83 list_for_each_entry_safe(stit, tmp, &stt->iommu_tables, next) { 84 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { 85 if (table_group->tables[i] != stit->tbl) 86 continue; 87 88 kref_put(&stit->kref, kvm_spapr_tce_liobn_put); 89 } 90 } 91 } 92 } 93 94 extern long kvm_spapr_tce_attach_iommu_group(struct kvm *kvm, int tablefd, 95 struct iommu_group *grp) 96 { 97 struct kvmppc_spapr_tce_table *stt = NULL; 98 bool found = false; 99 struct iommu_table *tbl = NULL; 100 struct iommu_table_group *table_group; 101 long i; 102 struct kvmppc_spapr_tce_iommu_table *stit; 103 struct fd f; 104 105 f = fdget(tablefd); 106 if (!f.file) 107 return -EBADF; 108 109 list_for_each_entry_rcu(stt, &kvm->arch.spapr_tce_tables, list) { 110 if (stt == f.file->private_data) { 111 found = true; 112 break; 113 } 114 } 115 116 fdput(f); 117 118 if (!found) 119 return -EINVAL; 120 121 table_group = iommu_group_get_iommudata(grp); 122 if (WARN_ON(!table_group)) 123 return -EFAULT; 124 125 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { 126 struct iommu_table *tbltmp = table_group->tables[i]; 127 128 if (!tbltmp) 129 continue; 130 /* Make sure hardware table parameters are compatible */ 131 if ((tbltmp->it_page_shift <= stt->page_shift) && 132 (tbltmp->it_offset << tbltmp->it_page_shift == 133 stt->offset << stt->page_shift) && 134 (tbltmp->it_size << tbltmp->it_page_shift >= 135 stt->size << stt->page_shift)) { 136 /* 137 * Reference the table to avoid races with 138 * add/remove DMA windows. 139 */ 140 tbl = iommu_tce_table_get(tbltmp); 141 break; 142 } 143 } 144 if (!tbl) 145 return -EINVAL; 146 147 list_for_each_entry_rcu(stit, &stt->iommu_tables, next) { 148 if (tbl != stit->tbl) 149 continue; 150 151 if (!kref_get_unless_zero(&stit->kref)) { 152 /* stit is being destroyed */ 153 iommu_tce_table_put(tbl); 154 return -ENOTTY; 155 } 156 /* 157 * The table is already known to this KVM, we just increased 158 * its KVM reference counter and can return. 159 */ 160 return 0; 161 } 162 163 stit = kzalloc(sizeof(*stit), GFP_KERNEL); 164 if (!stit) { 165 iommu_tce_table_put(tbl); 166 return -ENOMEM; 167 } 168 169 stit->tbl = tbl; 170 kref_init(&stit->kref); 171 172 list_add_rcu(&stit->next, &stt->iommu_tables); 173 174 return 0; 175 } 176 177 static void release_spapr_tce_table(struct rcu_head *head) 178 { 179 struct kvmppc_spapr_tce_table *stt = container_of(head, 180 struct kvmppc_spapr_tce_table, rcu); 181 unsigned long i, npages = kvmppc_tce_pages(stt->size); 182 183 for (i = 0; i < npages; i++) 184 if (stt->pages[i]) 185 __free_page(stt->pages[i]); 186 187 kfree(stt); 188 } 189 190 static struct page *kvm_spapr_get_tce_page(struct kvmppc_spapr_tce_table *stt, 191 unsigned long sttpage) 192 { 193 struct page *page = stt->pages[sttpage]; 194 195 if (page) 196 return page; 197 198 mutex_lock(&stt->alloc_lock); 199 page = stt->pages[sttpage]; 200 if (!page) { 201 page = alloc_page(GFP_KERNEL | __GFP_ZERO); 202 WARN_ON_ONCE(!page); 203 if (page) 204 stt->pages[sttpage] = page; 205 } 206 mutex_unlock(&stt->alloc_lock); 207 208 return page; 209 } 210 211 static vm_fault_t kvm_spapr_tce_fault(struct vm_fault *vmf) 212 { 213 struct kvmppc_spapr_tce_table *stt = vmf->vma->vm_file->private_data; 214 struct page *page; 215 216 if (vmf->pgoff >= kvmppc_tce_pages(stt->size)) 217 return VM_FAULT_SIGBUS; 218 219 page = kvm_spapr_get_tce_page(stt, vmf->pgoff); 220 if (!page) 221 return VM_FAULT_OOM; 222 223 get_page(page); 224 vmf->page = page; 225 return 0; 226 } 227 228 static const struct vm_operations_struct kvm_spapr_tce_vm_ops = { 229 .fault = kvm_spapr_tce_fault, 230 }; 231 232 static int kvm_spapr_tce_mmap(struct file *file, struct vm_area_struct *vma) 233 { 234 vma->vm_ops = &kvm_spapr_tce_vm_ops; 235 return 0; 236 } 237 238 static int kvm_spapr_tce_release(struct inode *inode, struct file *filp) 239 { 240 struct kvmppc_spapr_tce_table *stt = filp->private_data; 241 struct kvmppc_spapr_tce_iommu_table *stit, *tmp; 242 struct kvm *kvm = stt->kvm; 243 244 mutex_lock(&kvm->lock); 245 list_del_rcu(&stt->list); 246 mutex_unlock(&kvm->lock); 247 248 list_for_each_entry_safe(stit, tmp, &stt->iommu_tables, next) { 249 WARN_ON(!kref_read(&stit->kref)); 250 while (1) { 251 if (kref_put(&stit->kref, kvm_spapr_tce_liobn_put)) 252 break; 253 } 254 } 255 256 kvm_put_kvm(stt->kvm); 257 258 account_locked_vm(current->mm, 259 kvmppc_stt_pages(kvmppc_tce_pages(stt->size)), false); 260 call_rcu(&stt->rcu, release_spapr_tce_table); 261 262 return 0; 263 } 264 265 static const struct file_operations kvm_spapr_tce_fops = { 266 .mmap = kvm_spapr_tce_mmap, 267 .release = kvm_spapr_tce_release, 268 }; 269 270 long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm, 271 struct kvm_create_spapr_tce_64 *args) 272 { 273 struct kvmppc_spapr_tce_table *stt = NULL; 274 struct kvmppc_spapr_tce_table *siter; 275 unsigned long npages, size = args->size; 276 int ret = -ENOMEM; 277 278 if (!args->size || args->page_shift < 12 || args->page_shift > 34 || 279 (args->offset + args->size > (ULLONG_MAX >> args->page_shift))) 280 return -EINVAL; 281 282 npages = kvmppc_tce_pages(size); 283 ret = account_locked_vm(current->mm, kvmppc_stt_pages(npages), true); 284 if (ret) 285 return ret; 286 287 ret = -ENOMEM; 288 stt = kzalloc(sizeof(*stt) + npages * sizeof(struct page *), 289 GFP_KERNEL); 290 if (!stt) 291 goto fail_acct; 292 293 stt->liobn = args->liobn; 294 stt->page_shift = args->page_shift; 295 stt->offset = args->offset; 296 stt->size = size; 297 stt->kvm = kvm; 298 mutex_init(&stt->alloc_lock); 299 INIT_LIST_HEAD_RCU(&stt->iommu_tables); 300 301 mutex_lock(&kvm->lock); 302 303 /* Check this LIOBN hasn't been previously allocated */ 304 ret = 0; 305 list_for_each_entry(siter, &kvm->arch.spapr_tce_tables, list) { 306 if (siter->liobn == args->liobn) { 307 ret = -EBUSY; 308 break; 309 } 310 } 311 312 kvm_get_kvm(kvm); 313 if (!ret) 314 ret = anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops, 315 stt, O_RDWR | O_CLOEXEC); 316 317 if (ret >= 0) 318 list_add_rcu(&stt->list, &kvm->arch.spapr_tce_tables); 319 else 320 kvm_put_kvm(kvm); 321 322 mutex_unlock(&kvm->lock); 323 324 if (ret >= 0) 325 return ret; 326 327 kfree(stt); 328 fail_acct: 329 account_locked_vm(current->mm, kvmppc_stt_pages(npages), false); 330 return ret; 331 } 332 333 static long kvmppc_tce_to_ua(struct kvm *kvm, unsigned long tce, 334 unsigned long *ua) 335 { 336 unsigned long gfn = tce >> PAGE_SHIFT; 337 struct kvm_memory_slot *memslot; 338 339 memslot = search_memslots(kvm_memslots(kvm), gfn); 340 if (!memslot) 341 return -EINVAL; 342 343 *ua = __gfn_to_hva_memslot(memslot, gfn) | 344 (tce & ~(PAGE_MASK | TCE_PCI_READ | TCE_PCI_WRITE)); 345 346 return 0; 347 } 348 349 static long kvmppc_tce_validate(struct kvmppc_spapr_tce_table *stt, 350 unsigned long tce) 351 { 352 unsigned long gpa = tce & ~(TCE_PCI_READ | TCE_PCI_WRITE); 353 enum dma_data_direction dir = iommu_tce_direction(tce); 354 struct kvmppc_spapr_tce_iommu_table *stit; 355 unsigned long ua = 0; 356 357 /* Allow userspace to poison TCE table */ 358 if (dir == DMA_NONE) 359 return H_SUCCESS; 360 361 if (iommu_tce_check_gpa(stt->page_shift, gpa)) 362 return H_TOO_HARD; 363 364 if (kvmppc_tce_to_ua(stt->kvm, tce, &ua)) 365 return H_TOO_HARD; 366 367 list_for_each_entry_rcu(stit, &stt->iommu_tables, next) { 368 unsigned long hpa = 0; 369 struct mm_iommu_table_group_mem_t *mem; 370 long shift = stit->tbl->it_page_shift; 371 372 mem = mm_iommu_lookup(stt->kvm->mm, ua, 1ULL << shift); 373 if (!mem) 374 return H_TOO_HARD; 375 376 if (mm_iommu_ua_to_hpa(mem, ua, shift, &hpa)) 377 return H_TOO_HARD; 378 } 379 380 return H_SUCCESS; 381 } 382 383 /* 384 * Handles TCE requests for emulated devices. 385 * Puts guest TCE values to the table and expects user space to convert them. 386 * Cannot fail so kvmppc_tce_validate must be called before it. 387 */ 388 static void kvmppc_tce_put(struct kvmppc_spapr_tce_table *stt, 389 unsigned long idx, unsigned long tce) 390 { 391 struct page *page; 392 u64 *tbl; 393 unsigned long sttpage; 394 395 idx -= stt->offset; 396 sttpage = idx / TCES_PER_PAGE; 397 page = stt->pages[sttpage]; 398 399 if (!page) { 400 /* We allow any TCE, not just with read|write permissions */ 401 if (!tce) 402 return; 403 404 page = kvm_spapr_get_tce_page(stt, sttpage); 405 if (!page) 406 return; 407 } 408 tbl = page_to_virt(page); 409 410 tbl[idx % TCES_PER_PAGE] = tce; 411 } 412 413 static void kvmppc_clear_tce(struct mm_struct *mm, struct iommu_table *tbl, 414 unsigned long entry) 415 { 416 unsigned long hpa = 0; 417 enum dma_data_direction dir = DMA_NONE; 418 419 iommu_tce_xchg_no_kill(mm, tbl, entry, &hpa, &dir); 420 } 421 422 static long kvmppc_tce_iommu_mapped_dec(struct kvm *kvm, 423 struct iommu_table *tbl, unsigned long entry) 424 { 425 struct mm_iommu_table_group_mem_t *mem = NULL; 426 const unsigned long pgsize = 1ULL << tbl->it_page_shift; 427 __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl, entry); 428 429 if (!pua) 430 return H_SUCCESS; 431 432 mem = mm_iommu_lookup(kvm->mm, be64_to_cpu(*pua), pgsize); 433 if (!mem) 434 return H_TOO_HARD; 435 436 mm_iommu_mapped_dec(mem); 437 438 *pua = cpu_to_be64(0); 439 440 return H_SUCCESS; 441 } 442 443 static long kvmppc_tce_iommu_do_unmap(struct kvm *kvm, 444 struct iommu_table *tbl, unsigned long entry) 445 { 446 enum dma_data_direction dir = DMA_NONE; 447 unsigned long hpa = 0; 448 long ret; 449 450 if (WARN_ON_ONCE(iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, 451 &dir))) 452 return H_TOO_HARD; 453 454 if (dir == DMA_NONE) 455 return H_SUCCESS; 456 457 ret = kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry); 458 if (ret != H_SUCCESS) 459 iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, &dir); 460 461 return ret; 462 } 463 464 static long kvmppc_tce_iommu_unmap(struct kvm *kvm, 465 struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl, 466 unsigned long entry) 467 { 468 unsigned long i, ret = H_SUCCESS; 469 unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift); 470 unsigned long io_entry = entry * subpages; 471 472 for (i = 0; i < subpages; ++i) { 473 ret = kvmppc_tce_iommu_do_unmap(kvm, tbl, io_entry + i); 474 if (ret != H_SUCCESS) 475 break; 476 } 477 478 return ret; 479 } 480 481 long kvmppc_tce_iommu_do_map(struct kvm *kvm, struct iommu_table *tbl, 482 unsigned long entry, unsigned long ua, 483 enum dma_data_direction dir) 484 { 485 long ret; 486 unsigned long hpa; 487 __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry); 488 struct mm_iommu_table_group_mem_t *mem; 489 490 if (!pua) 491 /* it_userspace allocation might be delayed */ 492 return H_TOO_HARD; 493 494 mem = mm_iommu_lookup(kvm->mm, ua, 1ULL << tbl->it_page_shift); 495 if (!mem) 496 /* This only handles v2 IOMMU type, v1 is handled via ioctl() */ 497 return H_TOO_HARD; 498 499 if (WARN_ON_ONCE(mm_iommu_ua_to_hpa(mem, ua, tbl->it_page_shift, &hpa))) 500 return H_TOO_HARD; 501 502 if (mm_iommu_mapped_inc(mem)) 503 return H_TOO_HARD; 504 505 ret = iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, &dir); 506 if (WARN_ON_ONCE(ret)) { 507 mm_iommu_mapped_dec(mem); 508 return H_TOO_HARD; 509 } 510 511 if (dir != DMA_NONE) 512 kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry); 513 514 *pua = cpu_to_be64(ua); 515 516 return 0; 517 } 518 519 static long kvmppc_tce_iommu_map(struct kvm *kvm, 520 struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl, 521 unsigned long entry, unsigned long ua, 522 enum dma_data_direction dir) 523 { 524 unsigned long i, pgoff, ret = H_SUCCESS; 525 unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift); 526 unsigned long io_entry = entry * subpages; 527 528 for (i = 0, pgoff = 0; i < subpages; 529 ++i, pgoff += IOMMU_PAGE_SIZE(tbl)) { 530 531 ret = kvmppc_tce_iommu_do_map(kvm, tbl, 532 io_entry + i, ua + pgoff, dir); 533 if (ret != H_SUCCESS) 534 break; 535 } 536 537 return ret; 538 } 539 540 long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn, 541 unsigned long ioba, unsigned long tce) 542 { 543 struct kvmppc_spapr_tce_table *stt; 544 long ret, idx; 545 struct kvmppc_spapr_tce_iommu_table *stit; 546 unsigned long entry, ua = 0; 547 enum dma_data_direction dir; 548 549 /* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */ 550 /* liobn, ioba, tce); */ 551 552 stt = kvmppc_find_table(vcpu->kvm, liobn); 553 if (!stt) 554 return H_TOO_HARD; 555 556 ret = kvmppc_ioba_validate(stt, ioba, 1); 557 if (ret != H_SUCCESS) 558 return ret; 559 560 idx = srcu_read_lock(&vcpu->kvm->srcu); 561 562 ret = kvmppc_tce_validate(stt, tce); 563 if (ret != H_SUCCESS) 564 goto unlock_exit; 565 566 dir = iommu_tce_direction(tce); 567 568 if ((dir != DMA_NONE) && kvmppc_tce_to_ua(vcpu->kvm, tce, &ua)) { 569 ret = H_PARAMETER; 570 goto unlock_exit; 571 } 572 573 entry = ioba >> stt->page_shift; 574 575 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { 576 if (dir == DMA_NONE) 577 ret = kvmppc_tce_iommu_unmap(vcpu->kvm, stt, 578 stit->tbl, entry); 579 else 580 ret = kvmppc_tce_iommu_map(vcpu->kvm, stt, stit->tbl, 581 entry, ua, dir); 582 583 iommu_tce_kill(stit->tbl, entry, 1); 584 585 if (ret != H_SUCCESS) { 586 kvmppc_clear_tce(vcpu->kvm->mm, stit->tbl, entry); 587 goto unlock_exit; 588 } 589 } 590 591 kvmppc_tce_put(stt, entry, tce); 592 593 unlock_exit: 594 srcu_read_unlock(&vcpu->kvm->srcu, idx); 595 596 return ret; 597 } 598 EXPORT_SYMBOL_GPL(kvmppc_h_put_tce); 599 600 long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu, 601 unsigned long liobn, unsigned long ioba, 602 unsigned long tce_list, unsigned long npages) 603 { 604 struct kvmppc_spapr_tce_table *stt; 605 long i, ret = H_SUCCESS, idx; 606 unsigned long entry, ua = 0; 607 u64 __user *tces; 608 u64 tce; 609 struct kvmppc_spapr_tce_iommu_table *stit; 610 611 stt = kvmppc_find_table(vcpu->kvm, liobn); 612 if (!stt) 613 return H_TOO_HARD; 614 615 entry = ioba >> stt->page_shift; 616 /* 617 * SPAPR spec says that the maximum size of the list is 512 TCEs 618 * so the whole table fits in 4K page 619 */ 620 if (npages > 512) 621 return H_PARAMETER; 622 623 if (tce_list & (SZ_4K - 1)) 624 return H_PARAMETER; 625 626 ret = kvmppc_ioba_validate(stt, ioba, npages); 627 if (ret != H_SUCCESS) 628 return ret; 629 630 idx = srcu_read_lock(&vcpu->kvm->srcu); 631 if (kvmppc_tce_to_ua(vcpu->kvm, tce_list, &ua)) { 632 ret = H_TOO_HARD; 633 goto unlock_exit; 634 } 635 tces = (u64 __user *) ua; 636 637 for (i = 0; i < npages; ++i) { 638 if (get_user(tce, tces + i)) { 639 ret = H_TOO_HARD; 640 goto unlock_exit; 641 } 642 tce = be64_to_cpu(tce); 643 644 ret = kvmppc_tce_validate(stt, tce); 645 if (ret != H_SUCCESS) 646 goto unlock_exit; 647 } 648 649 for (i = 0; i < npages; ++i) { 650 /* 651 * This looks unsafe, because we validate, then regrab 652 * the TCE from userspace which could have been changed by 653 * another thread. 654 * 655 * But it actually is safe, because the relevant checks will be 656 * re-executed in the following code. If userspace tries to 657 * change this dodgily it will result in a messier failure mode 658 * but won't threaten the host. 659 */ 660 if (get_user(tce, tces + i)) { 661 ret = H_TOO_HARD; 662 goto invalidate_exit; 663 } 664 tce = be64_to_cpu(tce); 665 666 if (kvmppc_tce_to_ua(vcpu->kvm, tce, &ua)) { 667 ret = H_PARAMETER; 668 goto invalidate_exit; 669 } 670 671 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { 672 ret = kvmppc_tce_iommu_map(vcpu->kvm, stt, 673 stit->tbl, entry + i, ua, 674 iommu_tce_direction(tce)); 675 676 if (ret != H_SUCCESS) { 677 kvmppc_clear_tce(vcpu->kvm->mm, stit->tbl, 678 entry); 679 goto invalidate_exit; 680 } 681 } 682 683 kvmppc_tce_put(stt, entry + i, tce); 684 } 685 686 invalidate_exit: 687 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) 688 iommu_tce_kill(stit->tbl, entry, npages); 689 690 unlock_exit: 691 srcu_read_unlock(&vcpu->kvm->srcu, idx); 692 693 return ret; 694 } 695 EXPORT_SYMBOL_GPL(kvmppc_h_put_tce_indirect); 696 697 long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu, 698 unsigned long liobn, unsigned long ioba, 699 unsigned long tce_value, unsigned long npages) 700 { 701 struct kvmppc_spapr_tce_table *stt; 702 long i, ret; 703 struct kvmppc_spapr_tce_iommu_table *stit; 704 705 stt = kvmppc_find_table(vcpu->kvm, liobn); 706 if (!stt) 707 return H_TOO_HARD; 708 709 ret = kvmppc_ioba_validate(stt, ioba, npages); 710 if (ret != H_SUCCESS) 711 return ret; 712 713 /* Check permission bits only to allow userspace poison TCE for debug */ 714 if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ)) 715 return H_PARAMETER; 716 717 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { 718 unsigned long entry = ioba >> stt->page_shift; 719 720 for (i = 0; i < npages; ++i) { 721 ret = kvmppc_tce_iommu_unmap(vcpu->kvm, stt, 722 stit->tbl, entry + i); 723 724 if (ret == H_SUCCESS) 725 continue; 726 727 if (ret == H_TOO_HARD) 728 goto invalidate_exit; 729 730 WARN_ON_ONCE(1); 731 kvmppc_clear_tce(vcpu->kvm->mm, stit->tbl, entry); 732 } 733 } 734 735 for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift)) 736 kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value); 737 738 invalidate_exit: 739 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) 740 iommu_tce_kill(stit->tbl, ioba >> stt->page_shift, npages); 741 742 return ret; 743 } 744 EXPORT_SYMBOL_GPL(kvmppc_h_stuff_tce); 745