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 account_locked_vm(kvm->mm, 257 kvmppc_stt_pages(kvmppc_tce_pages(stt->size)), false); 258 259 kvm_put_kvm(stt->kvm); 260 261 call_rcu(&stt->rcu, release_spapr_tce_table); 262 263 return 0; 264 } 265 266 static const struct file_operations kvm_spapr_tce_fops = { 267 .mmap = kvm_spapr_tce_mmap, 268 .release = kvm_spapr_tce_release, 269 }; 270 271 long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm, 272 struct kvm_create_spapr_tce_64 *args) 273 { 274 struct kvmppc_spapr_tce_table *stt = NULL; 275 struct kvmppc_spapr_tce_table *siter; 276 struct mm_struct *mm = kvm->mm; 277 unsigned long npages, size = args->size; 278 int ret = -ENOMEM; 279 280 if (!args->size || args->page_shift < 12 || args->page_shift > 34 || 281 (args->offset + args->size > (ULLONG_MAX >> args->page_shift))) 282 return -EINVAL; 283 284 npages = kvmppc_tce_pages(size); 285 ret = account_locked_vm(mm, kvmppc_stt_pages(npages), true); 286 if (ret) 287 return ret; 288 289 ret = -ENOMEM; 290 stt = kzalloc(sizeof(*stt) + npages * sizeof(struct page *), 291 GFP_KERNEL); 292 if (!stt) 293 goto fail_acct; 294 295 stt->liobn = args->liobn; 296 stt->page_shift = args->page_shift; 297 stt->offset = args->offset; 298 stt->size = size; 299 stt->kvm = kvm; 300 mutex_init(&stt->alloc_lock); 301 INIT_LIST_HEAD_RCU(&stt->iommu_tables); 302 303 mutex_lock(&kvm->lock); 304 305 /* Check this LIOBN hasn't been previously allocated */ 306 ret = 0; 307 list_for_each_entry(siter, &kvm->arch.spapr_tce_tables, list) { 308 if (siter->liobn == args->liobn) { 309 ret = -EBUSY; 310 break; 311 } 312 } 313 314 kvm_get_kvm(kvm); 315 if (!ret) 316 ret = anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops, 317 stt, O_RDWR | O_CLOEXEC); 318 319 if (ret >= 0) 320 list_add_rcu(&stt->list, &kvm->arch.spapr_tce_tables); 321 else 322 kvm_put_kvm_no_destroy(kvm); 323 324 mutex_unlock(&kvm->lock); 325 326 if (ret >= 0) 327 return ret; 328 329 kfree(stt); 330 fail_acct: 331 account_locked_vm(mm, kvmppc_stt_pages(npages), false); 332 return ret; 333 } 334 335 static long kvmppc_tce_to_ua(struct kvm *kvm, unsigned long tce, 336 unsigned long *ua) 337 { 338 unsigned long gfn = tce >> PAGE_SHIFT; 339 struct kvm_memory_slot *memslot; 340 341 memslot = search_memslots(kvm_memslots(kvm), gfn); 342 if (!memslot) 343 return -EINVAL; 344 345 *ua = __gfn_to_hva_memslot(memslot, gfn) | 346 (tce & ~(PAGE_MASK | TCE_PCI_READ | TCE_PCI_WRITE)); 347 348 return 0; 349 } 350 351 static long kvmppc_tce_validate(struct kvmppc_spapr_tce_table *stt, 352 unsigned long tce) 353 { 354 unsigned long gpa = tce & ~(TCE_PCI_READ | TCE_PCI_WRITE); 355 enum dma_data_direction dir = iommu_tce_direction(tce); 356 struct kvmppc_spapr_tce_iommu_table *stit; 357 unsigned long ua = 0; 358 359 /* Allow userspace to poison TCE table */ 360 if (dir == DMA_NONE) 361 return H_SUCCESS; 362 363 if (iommu_tce_check_gpa(stt->page_shift, gpa)) 364 return H_TOO_HARD; 365 366 if (kvmppc_tce_to_ua(stt->kvm, tce, &ua)) 367 return H_TOO_HARD; 368 369 list_for_each_entry_rcu(stit, &stt->iommu_tables, next) { 370 unsigned long hpa = 0; 371 struct mm_iommu_table_group_mem_t *mem; 372 long shift = stit->tbl->it_page_shift; 373 374 mem = mm_iommu_lookup(stt->kvm->mm, ua, 1ULL << shift); 375 if (!mem) 376 return H_TOO_HARD; 377 378 if (mm_iommu_ua_to_hpa(mem, ua, shift, &hpa)) 379 return H_TOO_HARD; 380 } 381 382 return H_SUCCESS; 383 } 384 385 /* 386 * Handles TCE requests for emulated devices. 387 * Puts guest TCE values to the table and expects user space to convert them. 388 * Cannot fail so kvmppc_tce_validate must be called before it. 389 */ 390 static void kvmppc_tce_put(struct kvmppc_spapr_tce_table *stt, 391 unsigned long idx, unsigned long tce) 392 { 393 struct page *page; 394 u64 *tbl; 395 unsigned long sttpage; 396 397 idx -= stt->offset; 398 sttpage = idx / TCES_PER_PAGE; 399 page = stt->pages[sttpage]; 400 401 if (!page) { 402 /* We allow any TCE, not just with read|write permissions */ 403 if (!tce) 404 return; 405 406 page = kvm_spapr_get_tce_page(stt, sttpage); 407 if (!page) 408 return; 409 } 410 tbl = page_to_virt(page); 411 412 tbl[idx % TCES_PER_PAGE] = tce; 413 } 414 415 static void kvmppc_clear_tce(struct mm_struct *mm, struct iommu_table *tbl, 416 unsigned long entry) 417 { 418 unsigned long hpa = 0; 419 enum dma_data_direction dir = DMA_NONE; 420 421 iommu_tce_xchg_no_kill(mm, tbl, entry, &hpa, &dir); 422 } 423 424 static long kvmppc_tce_iommu_mapped_dec(struct kvm *kvm, 425 struct iommu_table *tbl, unsigned long entry) 426 { 427 struct mm_iommu_table_group_mem_t *mem = NULL; 428 const unsigned long pgsize = 1ULL << tbl->it_page_shift; 429 __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl, entry); 430 431 if (!pua) 432 return H_SUCCESS; 433 434 mem = mm_iommu_lookup(kvm->mm, be64_to_cpu(*pua), pgsize); 435 if (!mem) 436 return H_TOO_HARD; 437 438 mm_iommu_mapped_dec(mem); 439 440 *pua = cpu_to_be64(0); 441 442 return H_SUCCESS; 443 } 444 445 static long kvmppc_tce_iommu_do_unmap(struct kvm *kvm, 446 struct iommu_table *tbl, unsigned long entry) 447 { 448 enum dma_data_direction dir = DMA_NONE; 449 unsigned long hpa = 0; 450 long ret; 451 452 if (WARN_ON_ONCE(iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, 453 &dir))) 454 return H_TOO_HARD; 455 456 if (dir == DMA_NONE) 457 return H_SUCCESS; 458 459 ret = kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry); 460 if (ret != H_SUCCESS) 461 iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, &dir); 462 463 return ret; 464 } 465 466 static long kvmppc_tce_iommu_unmap(struct kvm *kvm, 467 struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl, 468 unsigned long entry) 469 { 470 unsigned long i, ret = H_SUCCESS; 471 unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift); 472 unsigned long io_entry = entry * subpages; 473 474 for (i = 0; i < subpages; ++i) { 475 ret = kvmppc_tce_iommu_do_unmap(kvm, tbl, io_entry + i); 476 if (ret != H_SUCCESS) 477 break; 478 } 479 480 return ret; 481 } 482 483 long kvmppc_tce_iommu_do_map(struct kvm *kvm, struct iommu_table *tbl, 484 unsigned long entry, unsigned long ua, 485 enum dma_data_direction dir) 486 { 487 long ret; 488 unsigned long hpa; 489 __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry); 490 struct mm_iommu_table_group_mem_t *mem; 491 492 if (!pua) 493 /* it_userspace allocation might be delayed */ 494 return H_TOO_HARD; 495 496 mem = mm_iommu_lookup(kvm->mm, ua, 1ULL << tbl->it_page_shift); 497 if (!mem) 498 /* This only handles v2 IOMMU type, v1 is handled via ioctl() */ 499 return H_TOO_HARD; 500 501 if (WARN_ON_ONCE(mm_iommu_ua_to_hpa(mem, ua, tbl->it_page_shift, &hpa))) 502 return H_TOO_HARD; 503 504 if (mm_iommu_mapped_inc(mem)) 505 return H_TOO_HARD; 506 507 ret = iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, &dir); 508 if (WARN_ON_ONCE(ret)) { 509 mm_iommu_mapped_dec(mem); 510 return H_TOO_HARD; 511 } 512 513 if (dir != DMA_NONE) 514 kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry); 515 516 *pua = cpu_to_be64(ua); 517 518 return 0; 519 } 520 521 static long kvmppc_tce_iommu_map(struct kvm *kvm, 522 struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl, 523 unsigned long entry, unsigned long ua, 524 enum dma_data_direction dir) 525 { 526 unsigned long i, pgoff, ret = H_SUCCESS; 527 unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift); 528 unsigned long io_entry = entry * subpages; 529 530 for (i = 0, pgoff = 0; i < subpages; 531 ++i, pgoff += IOMMU_PAGE_SIZE(tbl)) { 532 533 ret = kvmppc_tce_iommu_do_map(kvm, tbl, 534 io_entry + i, ua + pgoff, dir); 535 if (ret != H_SUCCESS) 536 break; 537 } 538 539 return ret; 540 } 541 542 long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn, 543 unsigned long ioba, unsigned long tce) 544 { 545 struct kvmppc_spapr_tce_table *stt; 546 long ret, idx; 547 struct kvmppc_spapr_tce_iommu_table *stit; 548 unsigned long entry, ua = 0; 549 enum dma_data_direction dir; 550 551 /* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */ 552 /* liobn, ioba, tce); */ 553 554 stt = kvmppc_find_table(vcpu->kvm, liobn); 555 if (!stt) 556 return H_TOO_HARD; 557 558 ret = kvmppc_ioba_validate(stt, ioba, 1); 559 if (ret != H_SUCCESS) 560 return ret; 561 562 idx = srcu_read_lock(&vcpu->kvm->srcu); 563 564 ret = kvmppc_tce_validate(stt, tce); 565 if (ret != H_SUCCESS) 566 goto unlock_exit; 567 568 dir = iommu_tce_direction(tce); 569 570 if ((dir != DMA_NONE) && kvmppc_tce_to_ua(vcpu->kvm, tce, &ua)) { 571 ret = H_PARAMETER; 572 goto unlock_exit; 573 } 574 575 entry = ioba >> stt->page_shift; 576 577 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { 578 if (dir == DMA_NONE) 579 ret = kvmppc_tce_iommu_unmap(vcpu->kvm, stt, 580 stit->tbl, entry); 581 else 582 ret = kvmppc_tce_iommu_map(vcpu->kvm, stt, stit->tbl, 583 entry, ua, dir); 584 585 iommu_tce_kill(stit->tbl, entry, 1); 586 587 if (ret != H_SUCCESS) { 588 kvmppc_clear_tce(vcpu->kvm->mm, stit->tbl, entry); 589 goto unlock_exit; 590 } 591 } 592 593 kvmppc_tce_put(stt, entry, tce); 594 595 unlock_exit: 596 srcu_read_unlock(&vcpu->kvm->srcu, idx); 597 598 return ret; 599 } 600 EXPORT_SYMBOL_GPL(kvmppc_h_put_tce); 601 602 long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu, 603 unsigned long liobn, unsigned long ioba, 604 unsigned long tce_list, unsigned long npages) 605 { 606 struct kvmppc_spapr_tce_table *stt; 607 long i, ret = H_SUCCESS, idx; 608 unsigned long entry, ua = 0; 609 u64 __user *tces; 610 u64 tce; 611 struct kvmppc_spapr_tce_iommu_table *stit; 612 613 stt = kvmppc_find_table(vcpu->kvm, liobn); 614 if (!stt) 615 return H_TOO_HARD; 616 617 entry = ioba >> stt->page_shift; 618 /* 619 * SPAPR spec says that the maximum size of the list is 512 TCEs 620 * so the whole table fits in 4K page 621 */ 622 if (npages > 512) 623 return H_PARAMETER; 624 625 if (tce_list & (SZ_4K - 1)) 626 return H_PARAMETER; 627 628 ret = kvmppc_ioba_validate(stt, ioba, npages); 629 if (ret != H_SUCCESS) 630 return ret; 631 632 idx = srcu_read_lock(&vcpu->kvm->srcu); 633 if (kvmppc_tce_to_ua(vcpu->kvm, tce_list, &ua)) { 634 ret = H_TOO_HARD; 635 goto unlock_exit; 636 } 637 tces = (u64 __user *) ua; 638 639 for (i = 0; i < npages; ++i) { 640 if (get_user(tce, tces + i)) { 641 ret = H_TOO_HARD; 642 goto unlock_exit; 643 } 644 tce = be64_to_cpu(tce); 645 646 ret = kvmppc_tce_validate(stt, tce); 647 if (ret != H_SUCCESS) 648 goto unlock_exit; 649 } 650 651 for (i = 0; i < npages; ++i) { 652 /* 653 * This looks unsafe, because we validate, then regrab 654 * the TCE from userspace which could have been changed by 655 * another thread. 656 * 657 * But it actually is safe, because the relevant checks will be 658 * re-executed in the following code. If userspace tries to 659 * change this dodgily it will result in a messier failure mode 660 * but won't threaten the host. 661 */ 662 if (get_user(tce, tces + i)) { 663 ret = H_TOO_HARD; 664 goto invalidate_exit; 665 } 666 tce = be64_to_cpu(tce); 667 668 if (kvmppc_tce_to_ua(vcpu->kvm, tce, &ua)) { 669 ret = H_PARAMETER; 670 goto invalidate_exit; 671 } 672 673 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { 674 ret = kvmppc_tce_iommu_map(vcpu->kvm, stt, 675 stit->tbl, entry + i, ua, 676 iommu_tce_direction(tce)); 677 678 if (ret != H_SUCCESS) { 679 kvmppc_clear_tce(vcpu->kvm->mm, stit->tbl, 680 entry); 681 goto invalidate_exit; 682 } 683 } 684 685 kvmppc_tce_put(stt, entry + i, tce); 686 } 687 688 invalidate_exit: 689 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) 690 iommu_tce_kill(stit->tbl, entry, npages); 691 692 unlock_exit: 693 srcu_read_unlock(&vcpu->kvm->srcu, idx); 694 695 return ret; 696 } 697 EXPORT_SYMBOL_GPL(kvmppc_h_put_tce_indirect); 698 699 long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu, 700 unsigned long liobn, unsigned long ioba, 701 unsigned long tce_value, unsigned long npages) 702 { 703 struct kvmppc_spapr_tce_table *stt; 704 long i, ret; 705 struct kvmppc_spapr_tce_iommu_table *stit; 706 707 stt = kvmppc_find_table(vcpu->kvm, liobn); 708 if (!stt) 709 return H_TOO_HARD; 710 711 ret = kvmppc_ioba_validate(stt, ioba, npages); 712 if (ret != H_SUCCESS) 713 return ret; 714 715 /* Check permission bits only to allow userspace poison TCE for debug */ 716 if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ)) 717 return H_PARAMETER; 718 719 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { 720 unsigned long entry = ioba >> stt->page_shift; 721 722 for (i = 0; i < npages; ++i) { 723 ret = kvmppc_tce_iommu_unmap(vcpu->kvm, stt, 724 stit->tbl, entry + i); 725 726 if (ret == H_SUCCESS) 727 continue; 728 729 if (ret == H_TOO_HARD) 730 goto invalidate_exit; 731 732 WARN_ON_ONCE(1); 733 kvmppc_clear_tce(vcpu->kvm->mm, stit->tbl, entry); 734 } 735 } 736 737 for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift)) 738 kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value); 739 740 invalidate_exit: 741 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) 742 iommu_tce_kill(stit->tbl, ioba >> stt->page_shift, npages); 743 744 return ret; 745 } 746 EXPORT_SYMBOL_GPL(kvmppc_h_stuff_tce); 747