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 struct kvmppc_spapr_tce_table *kvmppc_find_table(struct kvm *kvm, 36 unsigned long liobn) 37 { 38 struct kvmppc_spapr_tce_table *stt; 39 40 list_for_each_entry_lockless(stt, &kvm->arch.spapr_tce_tables, list) 41 if (stt->liobn == liobn) 42 return stt; 43 44 return NULL; 45 } 46 47 static unsigned long kvmppc_tce_pages(unsigned long iommu_pages) 48 { 49 return ALIGN(iommu_pages * sizeof(u64), PAGE_SIZE) / PAGE_SIZE; 50 } 51 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 void kvm_spapr_tce_iommu_table_free(struct rcu_head *head) 61 { 62 struct kvmppc_spapr_tce_iommu_table *stit = container_of(head, 63 struct kvmppc_spapr_tce_iommu_table, rcu); 64 65 iommu_tce_table_put(stit->tbl); 66 67 kfree(stit); 68 } 69 70 static void kvm_spapr_tce_liobn_put(struct kref *kref) 71 { 72 struct kvmppc_spapr_tce_iommu_table *stit = container_of(kref, 73 struct kvmppc_spapr_tce_iommu_table, kref); 74 75 list_del_rcu(&stit->next); 76 77 call_rcu(&stit->rcu, kvm_spapr_tce_iommu_table_free); 78 } 79 80 extern void kvm_spapr_tce_release_iommu_group(struct kvm *kvm, 81 struct iommu_group *grp) 82 { 83 int i; 84 struct kvmppc_spapr_tce_table *stt; 85 struct kvmppc_spapr_tce_iommu_table *stit, *tmp; 86 struct iommu_table_group *table_group = NULL; 87 88 rcu_read_lock(); 89 list_for_each_entry_rcu(stt, &kvm->arch.spapr_tce_tables, list) { 90 91 table_group = iommu_group_get_iommudata(grp); 92 if (WARN_ON(!table_group)) 93 continue; 94 95 list_for_each_entry_safe(stit, tmp, &stt->iommu_tables, next) { 96 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { 97 if (table_group->tables[i] != stit->tbl) 98 continue; 99 100 kref_put(&stit->kref, kvm_spapr_tce_liobn_put); 101 } 102 } 103 cond_resched_rcu(); 104 } 105 rcu_read_unlock(); 106 } 107 108 extern long kvm_spapr_tce_attach_iommu_group(struct kvm *kvm, int tablefd, 109 struct iommu_group *grp) 110 { 111 struct kvmppc_spapr_tce_table *stt = NULL; 112 bool found = false; 113 struct iommu_table *tbl = NULL; 114 struct iommu_table_group *table_group; 115 long i; 116 struct kvmppc_spapr_tce_iommu_table *stit; 117 struct fd f; 118 119 f = fdget(tablefd); 120 if (!f.file) 121 return -EBADF; 122 123 rcu_read_lock(); 124 list_for_each_entry_rcu(stt, &kvm->arch.spapr_tce_tables, list) { 125 if (stt == f.file->private_data) { 126 found = true; 127 break; 128 } 129 } 130 rcu_read_unlock(); 131 132 fdput(f); 133 134 if (!found) 135 return -EINVAL; 136 137 table_group = iommu_group_get_iommudata(grp); 138 if (WARN_ON(!table_group)) 139 return -EFAULT; 140 141 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { 142 struct iommu_table *tbltmp = table_group->tables[i]; 143 144 if (!tbltmp) 145 continue; 146 /* Make sure hardware table parameters are compatible */ 147 if ((tbltmp->it_page_shift <= stt->page_shift) && 148 (tbltmp->it_offset << tbltmp->it_page_shift == 149 stt->offset << stt->page_shift) && 150 (tbltmp->it_size << tbltmp->it_page_shift >= 151 stt->size << stt->page_shift)) { 152 /* 153 * Reference the table to avoid races with 154 * add/remove DMA windows. 155 */ 156 tbl = iommu_tce_table_get(tbltmp); 157 break; 158 } 159 } 160 if (!tbl) 161 return -EINVAL; 162 163 rcu_read_lock(); 164 list_for_each_entry_rcu(stit, &stt->iommu_tables, next) { 165 if (tbl != stit->tbl) 166 continue; 167 168 if (!kref_get_unless_zero(&stit->kref)) { 169 /* stit is being destroyed */ 170 iommu_tce_table_put(tbl); 171 rcu_read_unlock(); 172 return -ENOTTY; 173 } 174 /* 175 * The table is already known to this KVM, we just increased 176 * its KVM reference counter and can return. 177 */ 178 rcu_read_unlock(); 179 return 0; 180 } 181 rcu_read_unlock(); 182 183 stit = kzalloc(sizeof(*stit), GFP_KERNEL); 184 if (!stit) { 185 iommu_tce_table_put(tbl); 186 return -ENOMEM; 187 } 188 189 stit->tbl = tbl; 190 kref_init(&stit->kref); 191 192 list_add_rcu(&stit->next, &stt->iommu_tables); 193 194 return 0; 195 } 196 197 static void release_spapr_tce_table(struct rcu_head *head) 198 { 199 struct kvmppc_spapr_tce_table *stt = container_of(head, 200 struct kvmppc_spapr_tce_table, rcu); 201 unsigned long i, npages = kvmppc_tce_pages(stt->size); 202 203 for (i = 0; i < npages; i++) 204 if (stt->pages[i]) 205 __free_page(stt->pages[i]); 206 207 kfree(stt); 208 } 209 210 static struct page *kvm_spapr_get_tce_page(struct kvmppc_spapr_tce_table *stt, 211 unsigned long sttpage) 212 { 213 struct page *page = stt->pages[sttpage]; 214 215 if (page) 216 return page; 217 218 mutex_lock(&stt->alloc_lock); 219 page = stt->pages[sttpage]; 220 if (!page) { 221 page = alloc_page(GFP_KERNEL | __GFP_ZERO); 222 WARN_ON_ONCE(!page); 223 if (page) 224 stt->pages[sttpage] = page; 225 } 226 mutex_unlock(&stt->alloc_lock); 227 228 return page; 229 } 230 231 static vm_fault_t kvm_spapr_tce_fault(struct vm_fault *vmf) 232 { 233 struct kvmppc_spapr_tce_table *stt = vmf->vma->vm_file->private_data; 234 struct page *page; 235 236 if (vmf->pgoff >= kvmppc_tce_pages(stt->size)) 237 return VM_FAULT_SIGBUS; 238 239 page = kvm_spapr_get_tce_page(stt, vmf->pgoff); 240 if (!page) 241 return VM_FAULT_OOM; 242 243 get_page(page); 244 vmf->page = page; 245 return 0; 246 } 247 248 static const struct vm_operations_struct kvm_spapr_tce_vm_ops = { 249 .fault = kvm_spapr_tce_fault, 250 }; 251 252 static int kvm_spapr_tce_mmap(struct file *file, struct vm_area_struct *vma) 253 { 254 vma->vm_ops = &kvm_spapr_tce_vm_ops; 255 return 0; 256 } 257 258 static int kvm_spapr_tce_release(struct inode *inode, struct file *filp) 259 { 260 struct kvmppc_spapr_tce_table *stt = filp->private_data; 261 struct kvmppc_spapr_tce_iommu_table *stit, *tmp; 262 struct kvm *kvm = stt->kvm; 263 264 mutex_lock(&kvm->lock); 265 list_del_rcu(&stt->list); 266 mutex_unlock(&kvm->lock); 267 268 list_for_each_entry_safe(stit, tmp, &stt->iommu_tables, next) { 269 WARN_ON(!kref_read(&stit->kref)); 270 while (1) { 271 if (kref_put(&stit->kref, kvm_spapr_tce_liobn_put)) 272 break; 273 } 274 } 275 276 account_locked_vm(kvm->mm, 277 kvmppc_stt_pages(kvmppc_tce_pages(stt->size)), false); 278 279 kvm_put_kvm(stt->kvm); 280 281 call_rcu(&stt->rcu, release_spapr_tce_table); 282 283 return 0; 284 } 285 286 static const struct file_operations kvm_spapr_tce_fops = { 287 .mmap = kvm_spapr_tce_mmap, 288 .release = kvm_spapr_tce_release, 289 }; 290 291 long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm, 292 struct kvm_create_spapr_tce_64 *args) 293 { 294 struct kvmppc_spapr_tce_table *stt = NULL; 295 struct kvmppc_spapr_tce_table *siter; 296 struct mm_struct *mm = kvm->mm; 297 unsigned long npages, size = args->size; 298 int ret; 299 300 if (!args->size || args->page_shift < 12 || args->page_shift > 34 || 301 (args->offset + args->size > (ULLONG_MAX >> args->page_shift))) 302 return -EINVAL; 303 304 npages = kvmppc_tce_pages(size); 305 ret = account_locked_vm(mm, kvmppc_stt_pages(npages), true); 306 if (ret) 307 return ret; 308 309 ret = -ENOMEM; 310 stt = kzalloc(struct_size(stt, pages, npages), GFP_KERNEL | __GFP_NOWARN); 311 if (!stt) 312 goto fail_acct; 313 314 stt->liobn = args->liobn; 315 stt->page_shift = args->page_shift; 316 stt->offset = args->offset; 317 stt->size = size; 318 stt->kvm = kvm; 319 mutex_init(&stt->alloc_lock); 320 INIT_LIST_HEAD_RCU(&stt->iommu_tables); 321 322 mutex_lock(&kvm->lock); 323 324 /* Check this LIOBN hasn't been previously allocated */ 325 ret = 0; 326 list_for_each_entry(siter, &kvm->arch.spapr_tce_tables, list) { 327 if (siter->liobn == args->liobn) { 328 ret = -EBUSY; 329 break; 330 } 331 } 332 333 kvm_get_kvm(kvm); 334 if (!ret) 335 ret = anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops, 336 stt, O_RDWR | O_CLOEXEC); 337 338 if (ret >= 0) 339 list_add_rcu(&stt->list, &kvm->arch.spapr_tce_tables); 340 else 341 kvm_put_kvm_no_destroy(kvm); 342 343 mutex_unlock(&kvm->lock); 344 345 if (ret >= 0) 346 return ret; 347 348 kfree(stt); 349 fail_acct: 350 account_locked_vm(mm, kvmppc_stt_pages(npages), false); 351 return ret; 352 } 353 354 static long kvmppc_tce_to_ua(struct kvm *kvm, unsigned long tce, 355 unsigned long *ua) 356 { 357 unsigned long gfn = tce >> PAGE_SHIFT; 358 struct kvm_memory_slot *memslot; 359 360 memslot = __gfn_to_memslot(kvm_memslots(kvm), gfn); 361 if (!memslot) 362 return -EINVAL; 363 364 *ua = __gfn_to_hva_memslot(memslot, gfn) | 365 (tce & ~(PAGE_MASK | TCE_PCI_READ | TCE_PCI_WRITE)); 366 367 return 0; 368 } 369 370 static long kvmppc_tce_validate(struct kvmppc_spapr_tce_table *stt, 371 unsigned long tce) 372 { 373 unsigned long gpa = tce & ~(TCE_PCI_READ | TCE_PCI_WRITE); 374 enum dma_data_direction dir = iommu_tce_direction(tce); 375 struct kvmppc_spapr_tce_iommu_table *stit; 376 unsigned long ua = 0; 377 378 /* Allow userspace to poison TCE table */ 379 if (dir == DMA_NONE) 380 return H_SUCCESS; 381 382 if (iommu_tce_check_gpa(stt->page_shift, gpa)) 383 return H_TOO_HARD; 384 385 if (kvmppc_tce_to_ua(stt->kvm, tce, &ua)) 386 return H_TOO_HARD; 387 388 rcu_read_lock(); 389 list_for_each_entry_rcu(stit, &stt->iommu_tables, next) { 390 unsigned long hpa = 0; 391 struct mm_iommu_table_group_mem_t *mem; 392 long shift = stit->tbl->it_page_shift; 393 394 mem = mm_iommu_lookup(stt->kvm->mm, ua, 1ULL << shift); 395 if (!mem || mm_iommu_ua_to_hpa(mem, ua, shift, &hpa)) { 396 rcu_read_unlock(); 397 return H_TOO_HARD; 398 } 399 } 400 rcu_read_unlock(); 401 402 return H_SUCCESS; 403 } 404 405 /* 406 * Handles TCE requests for emulated devices. 407 * Puts guest TCE values to the table and expects user space to convert them. 408 * Cannot fail so kvmppc_tce_validate must be called before it. 409 */ 410 static void kvmppc_tce_put(struct kvmppc_spapr_tce_table *stt, 411 unsigned long idx, unsigned long tce) 412 { 413 struct page *page; 414 u64 *tbl; 415 unsigned long sttpage; 416 417 idx -= stt->offset; 418 sttpage = idx / TCES_PER_PAGE; 419 page = stt->pages[sttpage]; 420 421 if (!page) { 422 /* We allow any TCE, not just with read|write permissions */ 423 if (!tce) 424 return; 425 426 page = kvm_spapr_get_tce_page(stt, sttpage); 427 if (!page) 428 return; 429 } 430 tbl = page_to_virt(page); 431 432 tbl[idx % TCES_PER_PAGE] = tce; 433 } 434 435 static void kvmppc_clear_tce(struct mm_struct *mm, struct kvmppc_spapr_tce_table *stt, 436 struct iommu_table *tbl, unsigned long entry) 437 { 438 unsigned long i; 439 unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift); 440 unsigned long io_entry = entry << (stt->page_shift - tbl->it_page_shift); 441 442 for (i = 0; i < subpages; ++i) { 443 unsigned long hpa = 0; 444 enum dma_data_direction dir = DMA_NONE; 445 446 iommu_tce_xchg_no_kill(mm, tbl, io_entry + i, &hpa, &dir); 447 } 448 } 449 450 static long kvmppc_tce_iommu_mapped_dec(struct kvm *kvm, 451 struct iommu_table *tbl, unsigned long entry) 452 { 453 struct mm_iommu_table_group_mem_t *mem = NULL; 454 const unsigned long pgsize = 1ULL << tbl->it_page_shift; 455 __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl, entry); 456 457 if (!pua) 458 return H_SUCCESS; 459 460 mem = mm_iommu_lookup(kvm->mm, be64_to_cpu(*pua), pgsize); 461 if (!mem) 462 return H_TOO_HARD; 463 464 mm_iommu_mapped_dec(mem); 465 466 *pua = cpu_to_be64(0); 467 468 return H_SUCCESS; 469 } 470 471 static long kvmppc_tce_iommu_do_unmap(struct kvm *kvm, 472 struct iommu_table *tbl, unsigned long entry) 473 { 474 enum dma_data_direction dir = DMA_NONE; 475 unsigned long hpa = 0; 476 long ret; 477 478 if (WARN_ON_ONCE(iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, 479 &dir))) 480 return H_TOO_HARD; 481 482 if (dir == DMA_NONE) 483 return H_SUCCESS; 484 485 ret = kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry); 486 if (ret != H_SUCCESS) 487 iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, &dir); 488 489 return ret; 490 } 491 492 static long kvmppc_tce_iommu_unmap(struct kvm *kvm, 493 struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl, 494 unsigned long entry) 495 { 496 unsigned long i, ret = H_SUCCESS; 497 unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift); 498 unsigned long io_entry = entry * subpages; 499 500 for (i = 0; i < subpages; ++i) { 501 ret = kvmppc_tce_iommu_do_unmap(kvm, tbl, io_entry + i); 502 if (ret != H_SUCCESS) 503 break; 504 } 505 506 iommu_tce_kill(tbl, io_entry, subpages); 507 508 return ret; 509 } 510 511 static long kvmppc_tce_iommu_do_map(struct kvm *kvm, struct iommu_table *tbl, 512 unsigned long entry, unsigned long ua, 513 enum dma_data_direction dir) 514 { 515 long ret; 516 unsigned long hpa; 517 __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry); 518 struct mm_iommu_table_group_mem_t *mem; 519 520 if (!pua) 521 /* it_userspace allocation might be delayed */ 522 return H_TOO_HARD; 523 524 mem = mm_iommu_lookup(kvm->mm, ua, 1ULL << tbl->it_page_shift); 525 if (!mem) 526 /* This only handles v2 IOMMU type, v1 is handled via ioctl() */ 527 return H_TOO_HARD; 528 529 if (WARN_ON_ONCE(mm_iommu_ua_to_hpa(mem, ua, tbl->it_page_shift, &hpa))) 530 return H_TOO_HARD; 531 532 if (mm_iommu_mapped_inc(mem)) 533 return H_TOO_HARD; 534 535 ret = iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, &dir); 536 if (WARN_ON_ONCE(ret)) { 537 mm_iommu_mapped_dec(mem); 538 return H_TOO_HARD; 539 } 540 541 if (dir != DMA_NONE) 542 kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry); 543 544 *pua = cpu_to_be64(ua); 545 546 return 0; 547 } 548 549 static long kvmppc_tce_iommu_map(struct kvm *kvm, 550 struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl, 551 unsigned long entry, unsigned long ua, 552 enum dma_data_direction dir) 553 { 554 unsigned long i, pgoff, ret = H_SUCCESS; 555 unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift); 556 unsigned long io_entry = entry * subpages; 557 558 for (i = 0, pgoff = 0; i < subpages; 559 ++i, pgoff += IOMMU_PAGE_SIZE(tbl)) { 560 561 ret = kvmppc_tce_iommu_do_map(kvm, tbl, 562 io_entry + i, ua + pgoff, dir); 563 if (ret != H_SUCCESS) 564 break; 565 } 566 567 iommu_tce_kill(tbl, io_entry, subpages); 568 569 return ret; 570 } 571 572 long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn, 573 unsigned long ioba, unsigned long tce) 574 { 575 struct kvmppc_spapr_tce_table *stt; 576 long ret, idx; 577 struct kvmppc_spapr_tce_iommu_table *stit; 578 unsigned long entry, ua = 0; 579 enum dma_data_direction dir; 580 581 /* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */ 582 /* liobn, ioba, tce); */ 583 584 stt = kvmppc_find_table(vcpu->kvm, liobn); 585 if (!stt) 586 return H_TOO_HARD; 587 588 ret = kvmppc_ioba_validate(stt, ioba, 1); 589 if (ret != H_SUCCESS) 590 return ret; 591 592 idx = srcu_read_lock(&vcpu->kvm->srcu); 593 594 ret = kvmppc_tce_validate(stt, tce); 595 if (ret != H_SUCCESS) 596 goto unlock_exit; 597 598 dir = iommu_tce_direction(tce); 599 600 if ((dir != DMA_NONE) && kvmppc_tce_to_ua(vcpu->kvm, tce, &ua)) { 601 ret = H_PARAMETER; 602 goto unlock_exit; 603 } 604 605 entry = ioba >> stt->page_shift; 606 607 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { 608 if (dir == DMA_NONE) 609 ret = kvmppc_tce_iommu_unmap(vcpu->kvm, stt, 610 stit->tbl, entry); 611 else 612 ret = kvmppc_tce_iommu_map(vcpu->kvm, stt, stit->tbl, 613 entry, ua, dir); 614 615 616 if (ret != H_SUCCESS) { 617 kvmppc_clear_tce(vcpu->kvm->mm, stt, stit->tbl, entry); 618 goto unlock_exit; 619 } 620 } 621 622 kvmppc_tce_put(stt, entry, tce); 623 624 unlock_exit: 625 srcu_read_unlock(&vcpu->kvm->srcu, idx); 626 627 return ret; 628 } 629 EXPORT_SYMBOL_GPL(kvmppc_h_put_tce); 630 631 long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu, 632 unsigned long liobn, unsigned long ioba, 633 unsigned long tce_list, unsigned long npages) 634 { 635 struct kvmppc_spapr_tce_table *stt; 636 long i, ret = H_SUCCESS, idx; 637 unsigned long entry, ua = 0; 638 u64 __user *tces; 639 u64 tce; 640 struct kvmppc_spapr_tce_iommu_table *stit; 641 642 stt = kvmppc_find_table(vcpu->kvm, liobn); 643 if (!stt) 644 return H_TOO_HARD; 645 646 entry = ioba >> stt->page_shift; 647 /* 648 * SPAPR spec says that the maximum size of the list is 512 TCEs 649 * so the whole table fits in 4K page 650 */ 651 if (npages > 512) 652 return H_PARAMETER; 653 654 if (tce_list & (SZ_4K - 1)) 655 return H_PARAMETER; 656 657 ret = kvmppc_ioba_validate(stt, ioba, npages); 658 if (ret != H_SUCCESS) 659 return ret; 660 661 idx = srcu_read_lock(&vcpu->kvm->srcu); 662 if (kvmppc_tce_to_ua(vcpu->kvm, tce_list, &ua)) { 663 ret = H_TOO_HARD; 664 goto unlock_exit; 665 } 666 tces = (u64 __user *) ua; 667 668 for (i = 0; i < npages; ++i) { 669 if (get_user(tce, tces + i)) { 670 ret = H_TOO_HARD; 671 goto unlock_exit; 672 } 673 tce = be64_to_cpu(tce); 674 675 ret = kvmppc_tce_validate(stt, tce); 676 if (ret != H_SUCCESS) 677 goto unlock_exit; 678 } 679 680 for (i = 0; i < npages; ++i) { 681 /* 682 * This looks unsafe, because we validate, then regrab 683 * the TCE from userspace which could have been changed by 684 * another thread. 685 * 686 * But it actually is safe, because the relevant checks will be 687 * re-executed in the following code. If userspace tries to 688 * change this dodgily it will result in a messier failure mode 689 * but won't threaten the host. 690 */ 691 if (get_user(tce, tces + i)) { 692 ret = H_TOO_HARD; 693 goto unlock_exit; 694 } 695 tce = be64_to_cpu(tce); 696 697 if (kvmppc_tce_to_ua(vcpu->kvm, tce, &ua)) { 698 ret = H_PARAMETER; 699 goto unlock_exit; 700 } 701 702 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { 703 ret = kvmppc_tce_iommu_map(vcpu->kvm, stt, 704 stit->tbl, entry + i, ua, 705 iommu_tce_direction(tce)); 706 707 if (ret != H_SUCCESS) { 708 kvmppc_clear_tce(vcpu->kvm->mm, stt, stit->tbl, 709 entry + i); 710 goto unlock_exit; 711 } 712 } 713 714 kvmppc_tce_put(stt, entry + i, tce); 715 } 716 717 unlock_exit: 718 srcu_read_unlock(&vcpu->kvm->srcu, idx); 719 720 return ret; 721 } 722 EXPORT_SYMBOL_GPL(kvmppc_h_put_tce_indirect); 723 724 long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu, 725 unsigned long liobn, unsigned long ioba, 726 unsigned long tce_value, unsigned long npages) 727 { 728 struct kvmppc_spapr_tce_table *stt; 729 long i, ret; 730 struct kvmppc_spapr_tce_iommu_table *stit; 731 732 stt = kvmppc_find_table(vcpu->kvm, liobn); 733 if (!stt) 734 return H_TOO_HARD; 735 736 ret = kvmppc_ioba_validate(stt, ioba, npages); 737 if (ret != H_SUCCESS) 738 return ret; 739 740 /* Check permission bits only to allow userspace poison TCE for debug */ 741 if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ)) 742 return H_PARAMETER; 743 744 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { 745 unsigned long entry = ioba >> stt->page_shift; 746 747 for (i = 0; i < npages; ++i) { 748 ret = kvmppc_tce_iommu_unmap(vcpu->kvm, stt, 749 stit->tbl, entry + i); 750 751 if (ret == H_SUCCESS) 752 continue; 753 754 if (ret == H_TOO_HARD) 755 return ret; 756 757 WARN_ON_ONCE(1); 758 kvmppc_clear_tce(vcpu->kvm->mm, stt, stit->tbl, entry + i); 759 } 760 } 761 762 for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift)) 763 kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value); 764 765 return ret; 766 } 767 EXPORT_SYMBOL_GPL(kvmppc_h_stuff_tce); 768 769 long kvmppc_h_get_tce(struct kvm_vcpu *vcpu, unsigned long liobn, 770 unsigned long ioba) 771 { 772 struct kvmppc_spapr_tce_table *stt; 773 long ret; 774 unsigned long idx; 775 struct page *page; 776 u64 *tbl; 777 778 stt = kvmppc_find_table(vcpu->kvm, liobn); 779 if (!stt) 780 return H_TOO_HARD; 781 782 ret = kvmppc_ioba_validate(stt, ioba, 1); 783 if (ret != H_SUCCESS) 784 return ret; 785 786 idx = (ioba >> stt->page_shift) - stt->offset; 787 page = stt->pages[idx / TCES_PER_PAGE]; 788 if (!page) { 789 vcpu->arch.regs.gpr[4] = 0; 790 return H_SUCCESS; 791 } 792 tbl = (u64 *)page_address(page); 793 794 vcpu->arch.regs.gpr[4] = tbl[idx % TCES_PER_PAGE]; 795 796 return H_SUCCESS; 797 } 798 EXPORT_SYMBOL_GPL(kvmppc_h_get_tce); 799