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/udbg.h> 31 #include <asm/iommu.h> 32 #include <asm/tce.h> 33 #include <asm/mmu_context.h> 34 35 static unsigned long kvmppc_tce_pages(unsigned long iommu_pages) 36 { 37 return ALIGN(iommu_pages * sizeof(u64), PAGE_SIZE) / PAGE_SIZE; 38 } 39 40 static unsigned long kvmppc_stt_pages(unsigned long tce_pages) 41 { 42 unsigned long stt_bytes = sizeof(struct kvmppc_spapr_tce_table) + 43 (tce_pages * sizeof(struct page *)); 44 45 return tce_pages + ALIGN(stt_bytes, PAGE_SIZE) / PAGE_SIZE; 46 } 47 48 static void kvm_spapr_tce_iommu_table_free(struct rcu_head *head) 49 { 50 struct kvmppc_spapr_tce_iommu_table *stit = container_of(head, 51 struct kvmppc_spapr_tce_iommu_table, rcu); 52 53 iommu_tce_table_put(stit->tbl); 54 55 kfree(stit); 56 } 57 58 static void kvm_spapr_tce_liobn_put(struct kref *kref) 59 { 60 struct kvmppc_spapr_tce_iommu_table *stit = container_of(kref, 61 struct kvmppc_spapr_tce_iommu_table, kref); 62 63 list_del_rcu(&stit->next); 64 65 call_rcu(&stit->rcu, kvm_spapr_tce_iommu_table_free); 66 } 67 68 extern void kvm_spapr_tce_release_iommu_group(struct kvm *kvm, 69 struct iommu_group *grp) 70 { 71 int i; 72 struct kvmppc_spapr_tce_table *stt; 73 struct kvmppc_spapr_tce_iommu_table *stit, *tmp; 74 struct iommu_table_group *table_group = NULL; 75 76 list_for_each_entry_rcu(stt, &kvm->arch.spapr_tce_tables, list) { 77 78 table_group = iommu_group_get_iommudata(grp); 79 if (WARN_ON(!table_group)) 80 continue; 81 82 list_for_each_entry_safe(stit, tmp, &stt->iommu_tables, next) { 83 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { 84 if (table_group->tables[i] != stit->tbl) 85 continue; 86 87 kref_put(&stit->kref, kvm_spapr_tce_liobn_put); 88 } 89 } 90 } 91 } 92 93 extern long kvm_spapr_tce_attach_iommu_group(struct kvm *kvm, int tablefd, 94 struct iommu_group *grp) 95 { 96 struct kvmppc_spapr_tce_table *stt = NULL; 97 bool found = false; 98 struct iommu_table *tbl = NULL; 99 struct iommu_table_group *table_group; 100 long i; 101 struct kvmppc_spapr_tce_iommu_table *stit; 102 struct fd f; 103 104 f = fdget(tablefd); 105 if (!f.file) 106 return -EBADF; 107 108 list_for_each_entry_rcu(stt, &kvm->arch.spapr_tce_tables, list) { 109 if (stt == f.file->private_data) { 110 found = true; 111 break; 112 } 113 } 114 115 fdput(f); 116 117 if (!found) 118 return -EINVAL; 119 120 table_group = iommu_group_get_iommudata(grp); 121 if (WARN_ON(!table_group)) 122 return -EFAULT; 123 124 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { 125 struct iommu_table *tbltmp = table_group->tables[i]; 126 127 if (!tbltmp) 128 continue; 129 /* Make sure hardware table parameters are compatible */ 130 if ((tbltmp->it_page_shift <= stt->page_shift) && 131 (tbltmp->it_offset << tbltmp->it_page_shift == 132 stt->offset << stt->page_shift) && 133 (tbltmp->it_size << tbltmp->it_page_shift >= 134 stt->size << stt->page_shift)) { 135 /* 136 * Reference the table to avoid races with 137 * add/remove DMA windows. 138 */ 139 tbl = iommu_tce_table_get(tbltmp); 140 break; 141 } 142 } 143 if (!tbl) 144 return -EINVAL; 145 146 list_for_each_entry_rcu(stit, &stt->iommu_tables, next) { 147 if (tbl != stit->tbl) 148 continue; 149 150 if (!kref_get_unless_zero(&stit->kref)) { 151 /* stit is being destroyed */ 152 iommu_tce_table_put(tbl); 153 return -ENOTTY; 154 } 155 /* 156 * The table is already known to this KVM, we just increased 157 * its KVM reference counter and can return. 158 */ 159 return 0; 160 } 161 162 stit = kzalloc(sizeof(*stit), GFP_KERNEL); 163 if (!stit) { 164 iommu_tce_table_put(tbl); 165 return -ENOMEM; 166 } 167 168 stit->tbl = tbl; 169 kref_init(&stit->kref); 170 171 list_add_rcu(&stit->next, &stt->iommu_tables); 172 173 return 0; 174 } 175 176 static void release_spapr_tce_table(struct rcu_head *head) 177 { 178 struct kvmppc_spapr_tce_table *stt = container_of(head, 179 struct kvmppc_spapr_tce_table, rcu); 180 unsigned long i, npages = kvmppc_tce_pages(stt->size); 181 182 for (i = 0; i < npages; i++) 183 if (stt->pages[i]) 184 __free_page(stt->pages[i]); 185 186 kfree(stt); 187 } 188 189 static struct page *kvm_spapr_get_tce_page(struct kvmppc_spapr_tce_table *stt, 190 unsigned long sttpage) 191 { 192 struct page *page = stt->pages[sttpage]; 193 194 if (page) 195 return page; 196 197 mutex_lock(&stt->alloc_lock); 198 page = stt->pages[sttpage]; 199 if (!page) { 200 page = alloc_page(GFP_KERNEL | __GFP_ZERO); 201 WARN_ON_ONCE(!page); 202 if (page) 203 stt->pages[sttpage] = page; 204 } 205 mutex_unlock(&stt->alloc_lock); 206 207 return page; 208 } 209 210 static vm_fault_t kvm_spapr_tce_fault(struct vm_fault *vmf) 211 { 212 struct kvmppc_spapr_tce_table *stt = vmf->vma->vm_file->private_data; 213 struct page *page; 214 215 if (vmf->pgoff >= kvmppc_tce_pages(stt->size)) 216 return VM_FAULT_SIGBUS; 217 218 page = kvm_spapr_get_tce_page(stt, vmf->pgoff); 219 if (!page) 220 return VM_FAULT_OOM; 221 222 get_page(page); 223 vmf->page = page; 224 return 0; 225 } 226 227 static const struct vm_operations_struct kvm_spapr_tce_vm_ops = { 228 .fault = kvm_spapr_tce_fault, 229 }; 230 231 static int kvm_spapr_tce_mmap(struct file *file, struct vm_area_struct *vma) 232 { 233 vma->vm_ops = &kvm_spapr_tce_vm_ops; 234 return 0; 235 } 236 237 static int kvm_spapr_tce_release(struct inode *inode, struct file *filp) 238 { 239 struct kvmppc_spapr_tce_table *stt = filp->private_data; 240 struct kvmppc_spapr_tce_iommu_table *stit, *tmp; 241 struct kvm *kvm = stt->kvm; 242 243 mutex_lock(&kvm->lock); 244 list_del_rcu(&stt->list); 245 mutex_unlock(&kvm->lock); 246 247 list_for_each_entry_safe(stit, tmp, &stt->iommu_tables, next) { 248 WARN_ON(!kref_read(&stit->kref)); 249 while (1) { 250 if (kref_put(&stit->kref, kvm_spapr_tce_liobn_put)) 251 break; 252 } 253 } 254 255 account_locked_vm(kvm->mm, 256 kvmppc_stt_pages(kvmppc_tce_pages(stt->size)), false); 257 258 kvm_put_kvm(stt->kvm); 259 260 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 struct mm_struct *mm = kvm->mm; 276 unsigned long npages, size = args->size; 277 int ret = -ENOMEM; 278 279 if (!args->size || args->page_shift < 12 || args->page_shift > 34 || 280 (args->offset + args->size > (ULLONG_MAX >> args->page_shift))) 281 return -EINVAL; 282 283 npages = kvmppc_tce_pages(size); 284 ret = account_locked_vm(mm, kvmppc_stt_pages(npages), true); 285 if (ret) 286 return ret; 287 288 ret = -ENOMEM; 289 stt = kzalloc(sizeof(*stt) + npages * sizeof(struct page *), 290 GFP_KERNEL); 291 if (!stt) 292 goto fail_acct; 293 294 stt->liobn = args->liobn; 295 stt->page_shift = args->page_shift; 296 stt->offset = args->offset; 297 stt->size = size; 298 stt->kvm = kvm; 299 mutex_init(&stt->alloc_lock); 300 INIT_LIST_HEAD_RCU(&stt->iommu_tables); 301 302 mutex_lock(&kvm->lock); 303 304 /* Check this LIOBN hasn't been previously allocated */ 305 ret = 0; 306 list_for_each_entry(siter, &kvm->arch.spapr_tce_tables, list) { 307 if (siter->liobn == args->liobn) { 308 ret = -EBUSY; 309 break; 310 } 311 } 312 313 kvm_get_kvm(kvm); 314 if (!ret) 315 ret = anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops, 316 stt, O_RDWR | O_CLOEXEC); 317 318 if (ret >= 0) 319 list_add_rcu(&stt->list, &kvm->arch.spapr_tce_tables); 320 else 321 kvm_put_kvm_no_destroy(kvm); 322 323 mutex_unlock(&kvm->lock); 324 325 if (ret >= 0) 326 return ret; 327 328 kfree(stt); 329 fail_acct: 330 account_locked_vm(mm, kvmppc_stt_pages(npages), false); 331 return ret; 332 } 333 334 static long kvmppc_tce_to_ua(struct kvm *kvm, unsigned long tce, 335 unsigned long *ua) 336 { 337 unsigned long gfn = tce >> PAGE_SHIFT; 338 struct kvm_memory_slot *memslot; 339 340 memslot = search_memslots(kvm_memslots(kvm), gfn); 341 if (!memslot) 342 return -EINVAL; 343 344 *ua = __gfn_to_hva_memslot(memslot, gfn) | 345 (tce & ~(PAGE_MASK | TCE_PCI_READ | TCE_PCI_WRITE)); 346 347 return 0; 348 } 349 350 static long kvmppc_tce_validate(struct kvmppc_spapr_tce_table *stt, 351 unsigned long tce) 352 { 353 unsigned long gpa = tce & ~(TCE_PCI_READ | TCE_PCI_WRITE); 354 enum dma_data_direction dir = iommu_tce_direction(tce); 355 struct kvmppc_spapr_tce_iommu_table *stit; 356 unsigned long ua = 0; 357 358 /* Allow userspace to poison TCE table */ 359 if (dir == DMA_NONE) 360 return H_SUCCESS; 361 362 if (iommu_tce_check_gpa(stt->page_shift, gpa)) 363 return H_TOO_HARD; 364 365 if (kvmppc_tce_to_ua(stt->kvm, tce, &ua)) 366 return H_TOO_HARD; 367 368 list_for_each_entry_rcu(stit, &stt->iommu_tables, next) { 369 unsigned long hpa = 0; 370 struct mm_iommu_table_group_mem_t *mem; 371 long shift = stit->tbl->it_page_shift; 372 373 mem = mm_iommu_lookup(stt->kvm->mm, ua, 1ULL << shift); 374 if (!mem) 375 return H_TOO_HARD; 376 377 if (mm_iommu_ua_to_hpa(mem, ua, shift, &hpa)) 378 return H_TOO_HARD; 379 } 380 381 return H_SUCCESS; 382 } 383 384 /* 385 * Handles TCE requests for emulated devices. 386 * Puts guest TCE values to the table and expects user space to convert them. 387 * Cannot fail so kvmppc_tce_validate must be called before it. 388 */ 389 static void kvmppc_tce_put(struct kvmppc_spapr_tce_table *stt, 390 unsigned long idx, unsigned long tce) 391 { 392 struct page *page; 393 u64 *tbl; 394 unsigned long sttpage; 395 396 idx -= stt->offset; 397 sttpage = idx / TCES_PER_PAGE; 398 page = stt->pages[sttpage]; 399 400 if (!page) { 401 /* We allow any TCE, not just with read|write permissions */ 402 if (!tce) 403 return; 404 405 page = kvm_spapr_get_tce_page(stt, sttpage); 406 if (!page) 407 return; 408 } 409 tbl = page_to_virt(page); 410 411 tbl[idx % TCES_PER_PAGE] = tce; 412 } 413 414 static void kvmppc_clear_tce(struct mm_struct *mm, struct iommu_table *tbl, 415 unsigned long entry) 416 { 417 unsigned long hpa = 0; 418 enum dma_data_direction dir = DMA_NONE; 419 420 iommu_tce_xchg_no_kill(mm, tbl, entry, &hpa, &dir); 421 } 422 423 static long kvmppc_tce_iommu_mapped_dec(struct kvm *kvm, 424 struct iommu_table *tbl, unsigned long entry) 425 { 426 struct mm_iommu_table_group_mem_t *mem = NULL; 427 const unsigned long pgsize = 1ULL << tbl->it_page_shift; 428 __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl, entry); 429 430 if (!pua) 431 return H_SUCCESS; 432 433 mem = mm_iommu_lookup(kvm->mm, be64_to_cpu(*pua), pgsize); 434 if (!mem) 435 return H_TOO_HARD; 436 437 mm_iommu_mapped_dec(mem); 438 439 *pua = cpu_to_be64(0); 440 441 return H_SUCCESS; 442 } 443 444 static long kvmppc_tce_iommu_do_unmap(struct kvm *kvm, 445 struct iommu_table *tbl, unsigned long entry) 446 { 447 enum dma_data_direction dir = DMA_NONE; 448 unsigned long hpa = 0; 449 long ret; 450 451 if (WARN_ON_ONCE(iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, 452 &dir))) 453 return H_TOO_HARD; 454 455 if (dir == DMA_NONE) 456 return H_SUCCESS; 457 458 ret = kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry); 459 if (ret != H_SUCCESS) 460 iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, &dir); 461 462 return ret; 463 } 464 465 static long kvmppc_tce_iommu_unmap(struct kvm *kvm, 466 struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl, 467 unsigned long entry) 468 { 469 unsigned long i, ret = H_SUCCESS; 470 unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift); 471 unsigned long io_entry = entry * subpages; 472 473 for (i = 0; i < subpages; ++i) { 474 ret = kvmppc_tce_iommu_do_unmap(kvm, tbl, io_entry + i); 475 if (ret != H_SUCCESS) 476 break; 477 } 478 479 return ret; 480 } 481 482 long kvmppc_tce_iommu_do_map(struct kvm *kvm, struct iommu_table *tbl, 483 unsigned long entry, unsigned long ua, 484 enum dma_data_direction dir) 485 { 486 long ret; 487 unsigned long hpa; 488 __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry); 489 struct mm_iommu_table_group_mem_t *mem; 490 491 if (!pua) 492 /* it_userspace allocation might be delayed */ 493 return H_TOO_HARD; 494 495 mem = mm_iommu_lookup(kvm->mm, ua, 1ULL << tbl->it_page_shift); 496 if (!mem) 497 /* This only handles v2 IOMMU type, v1 is handled via ioctl() */ 498 return H_TOO_HARD; 499 500 if (WARN_ON_ONCE(mm_iommu_ua_to_hpa(mem, ua, tbl->it_page_shift, &hpa))) 501 return H_TOO_HARD; 502 503 if (mm_iommu_mapped_inc(mem)) 504 return H_TOO_HARD; 505 506 ret = iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, &dir); 507 if (WARN_ON_ONCE(ret)) { 508 mm_iommu_mapped_dec(mem); 509 return H_TOO_HARD; 510 } 511 512 if (dir != DMA_NONE) 513 kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry); 514 515 *pua = cpu_to_be64(ua); 516 517 return 0; 518 } 519 520 static long kvmppc_tce_iommu_map(struct kvm *kvm, 521 struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl, 522 unsigned long entry, unsigned long ua, 523 enum dma_data_direction dir) 524 { 525 unsigned long i, pgoff, ret = H_SUCCESS; 526 unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift); 527 unsigned long io_entry = entry * subpages; 528 529 for (i = 0, pgoff = 0; i < subpages; 530 ++i, pgoff += IOMMU_PAGE_SIZE(tbl)) { 531 532 ret = kvmppc_tce_iommu_do_map(kvm, tbl, 533 io_entry + i, ua + pgoff, dir); 534 if (ret != H_SUCCESS) 535 break; 536 } 537 538 return ret; 539 } 540 541 long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn, 542 unsigned long ioba, unsigned long tce) 543 { 544 struct kvmppc_spapr_tce_table *stt; 545 long ret, idx; 546 struct kvmppc_spapr_tce_iommu_table *stit; 547 unsigned long entry, ua = 0; 548 enum dma_data_direction dir; 549 550 /* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */ 551 /* liobn, ioba, tce); */ 552 553 stt = kvmppc_find_table(vcpu->kvm, liobn); 554 if (!stt) 555 return H_TOO_HARD; 556 557 ret = kvmppc_ioba_validate(stt, ioba, 1); 558 if (ret != H_SUCCESS) 559 return ret; 560 561 idx = srcu_read_lock(&vcpu->kvm->srcu); 562 563 ret = kvmppc_tce_validate(stt, tce); 564 if (ret != H_SUCCESS) 565 goto unlock_exit; 566 567 dir = iommu_tce_direction(tce); 568 569 if ((dir != DMA_NONE) && kvmppc_tce_to_ua(vcpu->kvm, tce, &ua)) { 570 ret = H_PARAMETER; 571 goto unlock_exit; 572 } 573 574 entry = ioba >> stt->page_shift; 575 576 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { 577 if (dir == DMA_NONE) 578 ret = kvmppc_tce_iommu_unmap(vcpu->kvm, stt, 579 stit->tbl, entry); 580 else 581 ret = kvmppc_tce_iommu_map(vcpu->kvm, stt, stit->tbl, 582 entry, ua, dir); 583 584 iommu_tce_kill(stit->tbl, entry, 1); 585 586 if (ret != H_SUCCESS) { 587 kvmppc_clear_tce(vcpu->kvm->mm, stit->tbl, entry); 588 goto unlock_exit; 589 } 590 } 591 592 kvmppc_tce_put(stt, entry, tce); 593 594 unlock_exit: 595 srcu_read_unlock(&vcpu->kvm->srcu, idx); 596 597 return ret; 598 } 599 EXPORT_SYMBOL_GPL(kvmppc_h_put_tce); 600 601 long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu, 602 unsigned long liobn, unsigned long ioba, 603 unsigned long tce_list, unsigned long npages) 604 { 605 struct kvmppc_spapr_tce_table *stt; 606 long i, ret = H_SUCCESS, idx; 607 unsigned long entry, ua = 0; 608 u64 __user *tces; 609 u64 tce; 610 struct kvmppc_spapr_tce_iommu_table *stit; 611 612 stt = kvmppc_find_table(vcpu->kvm, liobn); 613 if (!stt) 614 return H_TOO_HARD; 615 616 entry = ioba >> stt->page_shift; 617 /* 618 * SPAPR spec says that the maximum size of the list is 512 TCEs 619 * so the whole table fits in 4K page 620 */ 621 if (npages > 512) 622 return H_PARAMETER; 623 624 if (tce_list & (SZ_4K - 1)) 625 return H_PARAMETER; 626 627 ret = kvmppc_ioba_validate(stt, ioba, npages); 628 if (ret != H_SUCCESS) 629 return ret; 630 631 idx = srcu_read_lock(&vcpu->kvm->srcu); 632 if (kvmppc_tce_to_ua(vcpu->kvm, tce_list, &ua)) { 633 ret = H_TOO_HARD; 634 goto unlock_exit; 635 } 636 tces = (u64 __user *) ua; 637 638 for (i = 0; i < npages; ++i) { 639 if (get_user(tce, tces + i)) { 640 ret = H_TOO_HARD; 641 goto unlock_exit; 642 } 643 tce = be64_to_cpu(tce); 644 645 ret = kvmppc_tce_validate(stt, tce); 646 if (ret != H_SUCCESS) 647 goto unlock_exit; 648 } 649 650 for (i = 0; i < npages; ++i) { 651 /* 652 * This looks unsafe, because we validate, then regrab 653 * the TCE from userspace which could have been changed by 654 * another thread. 655 * 656 * But it actually is safe, because the relevant checks will be 657 * re-executed in the following code. If userspace tries to 658 * change this dodgily it will result in a messier failure mode 659 * but won't threaten the host. 660 */ 661 if (get_user(tce, tces + i)) { 662 ret = H_TOO_HARD; 663 goto invalidate_exit; 664 } 665 tce = be64_to_cpu(tce); 666 667 if (kvmppc_tce_to_ua(vcpu->kvm, tce, &ua)) { 668 ret = H_PARAMETER; 669 goto invalidate_exit; 670 } 671 672 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { 673 ret = kvmppc_tce_iommu_map(vcpu->kvm, stt, 674 stit->tbl, entry + i, ua, 675 iommu_tce_direction(tce)); 676 677 if (ret != H_SUCCESS) { 678 kvmppc_clear_tce(vcpu->kvm->mm, stit->tbl, 679 entry); 680 goto invalidate_exit; 681 } 682 } 683 684 kvmppc_tce_put(stt, entry + i, tce); 685 } 686 687 invalidate_exit: 688 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) 689 iommu_tce_kill(stit->tbl, entry, npages); 690 691 unlock_exit: 692 srcu_read_unlock(&vcpu->kvm->srcu, idx); 693 694 return ret; 695 } 696 EXPORT_SYMBOL_GPL(kvmppc_h_put_tce_indirect); 697 698 long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu, 699 unsigned long liobn, unsigned long ioba, 700 unsigned long tce_value, unsigned long npages) 701 { 702 struct kvmppc_spapr_tce_table *stt; 703 long i, ret; 704 struct kvmppc_spapr_tce_iommu_table *stit; 705 706 stt = kvmppc_find_table(vcpu->kvm, liobn); 707 if (!stt) 708 return H_TOO_HARD; 709 710 ret = kvmppc_ioba_validate(stt, ioba, npages); 711 if (ret != H_SUCCESS) 712 return ret; 713 714 /* Check permission bits only to allow userspace poison TCE for debug */ 715 if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ)) 716 return H_PARAMETER; 717 718 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { 719 unsigned long entry = ioba >> stt->page_shift; 720 721 for (i = 0; i < npages; ++i) { 722 ret = kvmppc_tce_iommu_unmap(vcpu->kvm, stt, 723 stit->tbl, entry + i); 724 725 if (ret == H_SUCCESS) 726 continue; 727 728 if (ret == H_TOO_HARD) 729 goto invalidate_exit; 730 731 WARN_ON_ONCE(1); 732 kvmppc_clear_tce(vcpu->kvm->mm, stit->tbl, entry); 733 } 734 } 735 736 for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift)) 737 kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value); 738 739 invalidate_exit: 740 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) 741 iommu_tce_kill(stit->tbl, ioba >> stt->page_shift, npages); 742 743 return ret; 744 } 745 EXPORT_SYMBOL_GPL(kvmppc_h_stuff_tce); 746