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 35static unsigned long kvmppc_tce_pages(unsigned long iommu_pages) 36{ 37 return ALIGN(iommu_pages * sizeof(u64), PAGE_SIZE) / PAGE_SIZE; 38} 39 40static 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 48static 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 58static 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 68extern 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 rcu_read_lock(); 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 cond_resched_rcu(); 92 } 93 rcu_read_unlock(); 94} 95 96extern long kvm_spapr_tce_attach_iommu_group(struct kvm *kvm, int tablefd, 97 struct iommu_group *grp) 98{ 99 struct kvmppc_spapr_tce_table *stt = NULL; 100 bool found = false; 101 struct iommu_table *tbl = NULL; 102 struct iommu_table_group *table_group; 103 long i; 104 struct kvmppc_spapr_tce_iommu_table *stit; 105 struct fd f; 106 107 f = fdget(tablefd); 108 if (!f.file) 109 return -EBADF; 110 111 rcu_read_lock(); 112 list_for_each_entry_rcu(stt, &kvm->arch.spapr_tce_tables, list) { 113 if (stt == f.file->private_data) { 114 found = true; 115 break; 116 } 117 } 118 rcu_read_unlock(); 119 120 fdput(f); 121 122 if (!found) 123 return -EINVAL; 124 125 table_group = iommu_group_get_iommudata(grp); 126 if (WARN_ON(!table_group)) 127 return -EFAULT; 128 129 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { 130 struct iommu_table *tbltmp = table_group->tables[i]; 131 132 if (!tbltmp) 133 continue; 134 /* Make sure hardware table parameters are compatible */ 135 if ((tbltmp->it_page_shift <= stt->page_shift) && 136 (tbltmp->it_offset << tbltmp->it_page_shift == 137 stt->offset << stt->page_shift) && 138 (tbltmp->it_size << tbltmp->it_page_shift >= 139 stt->size << stt->page_shift)) { 140 /* 141 * Reference the table to avoid races with 142 * add/remove DMA windows. 143 */ 144 tbl = iommu_tce_table_get(tbltmp); 145 break; 146 } 147 } 148 if (!tbl) 149 return -EINVAL; 150 151 rcu_read_lock(); 152 list_for_each_entry_rcu(stit, &stt->iommu_tables, next) { 153 if (tbl != stit->tbl) 154 continue; 155 156 if (!kref_get_unless_zero(&stit->kref)) { 157 /* stit is being destroyed */ 158 iommu_tce_table_put(tbl); 159 rcu_read_unlock(); 160 return -ENOTTY; 161 } 162 /* 163 * The table is already known to this KVM, we just increased 164 * its KVM reference counter and can return. 165 */ 166 rcu_read_unlock(); 167 return 0; 168 } 169 rcu_read_unlock(); 170 171 stit = kzalloc(sizeof(*stit), GFP_KERNEL); 172 if (!stit) { 173 iommu_tce_table_put(tbl); 174 return -ENOMEM; 175 } 176 177 stit->tbl = tbl; 178 kref_init(&stit->kref); 179 180 list_add_rcu(&stit->next, &stt->iommu_tables); 181 182 return 0; 183} 184 185static void release_spapr_tce_table(struct rcu_head *head) 186{ 187 struct kvmppc_spapr_tce_table *stt = container_of(head, 188 struct kvmppc_spapr_tce_table, rcu); 189 unsigned long i, npages = kvmppc_tce_pages(stt->size); 190 191 for (i = 0; i < npages; i++) 192 if (stt->pages[i]) 193 __free_page(stt->pages[i]); 194 195 kfree(stt); 196} 197 198static struct page *kvm_spapr_get_tce_page(struct kvmppc_spapr_tce_table *stt, 199 unsigned long sttpage) 200{ 201 struct page *page = stt->pages[sttpage]; 202 203 if (page) 204 return page; 205 206 mutex_lock(&stt->alloc_lock); 207 page = stt->pages[sttpage]; 208 if (!page) { 209 page = alloc_page(GFP_KERNEL | __GFP_ZERO); 210 WARN_ON_ONCE(!page); 211 if (page) 212 stt->pages[sttpage] = page; 213 } 214 mutex_unlock(&stt->alloc_lock); 215 216 return page; 217} 218 219static vm_fault_t kvm_spapr_tce_fault(struct vm_fault *vmf) 220{ 221 struct kvmppc_spapr_tce_table *stt = vmf->vma->vm_file->private_data; 222 struct page *page; 223 224 if (vmf->pgoff >= kvmppc_tce_pages(stt->size)) 225 return VM_FAULT_SIGBUS; 226 227 page = kvm_spapr_get_tce_page(stt, vmf->pgoff); 228 if (!page) 229 return VM_FAULT_OOM; 230 231 get_page(page); 232 vmf->page = page; 233 return 0; 234} 235 236static const struct vm_operations_struct kvm_spapr_tce_vm_ops = { 237 .fault = kvm_spapr_tce_fault, 238}; 239 240static int kvm_spapr_tce_mmap(struct file *file, struct vm_area_struct *vma) 241{ 242 vma->vm_ops = &kvm_spapr_tce_vm_ops; 243 return 0; 244} 245 246static int kvm_spapr_tce_release(struct inode *inode, struct file *filp) 247{ 248 struct kvmppc_spapr_tce_table *stt = filp->private_data; 249 struct kvmppc_spapr_tce_iommu_table *stit, *tmp; 250 struct kvm *kvm = stt->kvm; 251 252 mutex_lock(&kvm->lock); 253 list_del_rcu(&stt->list); 254 mutex_unlock(&kvm->lock); 255 256 list_for_each_entry_safe(stit, tmp, &stt->iommu_tables, next) { 257 WARN_ON(!kref_read(&stit->kref)); 258 while (1) { 259 if (kref_put(&stit->kref, kvm_spapr_tce_liobn_put)) 260 break; 261 } 262 } 263 264 account_locked_vm(kvm->mm, 265 kvmppc_stt_pages(kvmppc_tce_pages(stt->size)), false); 266 267 kvm_put_kvm(stt->kvm); 268 269 call_rcu(&stt->rcu, release_spapr_tce_table); 270 271 return 0; 272} 273 274static const struct file_operations kvm_spapr_tce_fops = { 275 .mmap = kvm_spapr_tce_mmap, 276 .release = kvm_spapr_tce_release, 277}; 278 279long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm, 280 struct kvm_create_spapr_tce_64 *args) 281{ 282 struct kvmppc_spapr_tce_table *stt = NULL; 283 struct kvmppc_spapr_tce_table *siter; 284 struct mm_struct *mm = kvm->mm; 285 unsigned long npages, size = args->size; 286 int ret; 287 288 if (!args->size || args->page_shift < 12 || args->page_shift > 34 || 289 (args->offset + args->size > (ULLONG_MAX >> args->page_shift))) 290 return -EINVAL; 291 292 npages = kvmppc_tce_pages(size); 293 ret = account_locked_vm(mm, kvmppc_stt_pages(npages), true); 294 if (ret) 295 return ret; 296 297 ret = -ENOMEM; 298 stt = kzalloc(sizeof(*stt) + npages * sizeof(struct page *), 299 GFP_KERNEL); 300 if (!stt) 301 goto fail_acct; 302 303 stt->liobn = args->liobn; 304 stt->page_shift = args->page_shift; 305 stt->offset = args->offset; 306 stt->size = size; 307 stt->kvm = kvm; 308 mutex_init(&stt->alloc_lock); 309 INIT_LIST_HEAD_RCU(&stt->iommu_tables); 310 311 mutex_lock(&kvm->lock); 312 313 /* Check this LIOBN hasn't been previously allocated */ 314 ret = 0; 315 list_for_each_entry(siter, &kvm->arch.spapr_tce_tables, list) { 316 if (siter->liobn == args->liobn) { 317 ret = -EBUSY; 318 break; 319 } 320 } 321 322 kvm_get_kvm(kvm); 323 if (!ret) 324 ret = anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops, 325 stt, O_RDWR | O_CLOEXEC); 326 327 if (ret >= 0) 328 list_add_rcu(&stt->list, &kvm->arch.spapr_tce_tables); 329 else 330 kvm_put_kvm_no_destroy(kvm); 331 332 mutex_unlock(&kvm->lock); 333 334 if (ret >= 0) 335 return ret; 336 337 kfree(stt); 338 fail_acct: 339 account_locked_vm(mm, kvmppc_stt_pages(npages), false); 340 return ret; 341} 342 343static long kvmppc_tce_to_ua(struct kvm *kvm, unsigned long tce, 344 unsigned long *ua) 345{ 346 unsigned long gfn = tce >> PAGE_SHIFT; 347 struct kvm_memory_slot *memslot; 348 349 memslot = search_memslots(kvm_memslots(kvm), gfn); 350 if (!memslot) 351 return -EINVAL; 352 353 *ua = __gfn_to_hva_memslot(memslot, gfn) | 354 (tce & ~(PAGE_MASK | TCE_PCI_READ | TCE_PCI_WRITE)); 355 356 return 0; 357} 358 359static long kvmppc_tce_validate(struct kvmppc_spapr_tce_table *stt, 360 unsigned long tce) 361{ 362 unsigned long gpa = tce & ~(TCE_PCI_READ | TCE_PCI_WRITE); 363 enum dma_data_direction dir = iommu_tce_direction(tce); 364 struct kvmppc_spapr_tce_iommu_table *stit; 365 unsigned long ua = 0; 366 367 /* Allow userspace to poison TCE table */ 368 if (dir == DMA_NONE) 369 return H_SUCCESS; 370 371 if (iommu_tce_check_gpa(stt->page_shift, gpa)) 372 return H_TOO_HARD; 373 374 if (kvmppc_tce_to_ua(stt->kvm, tce, &ua)) 375 return H_TOO_HARD; 376 377 rcu_read_lock(); 378 list_for_each_entry_rcu(stit, &stt->iommu_tables, next) { 379 unsigned long hpa = 0; 380 struct mm_iommu_table_group_mem_t *mem; 381 long shift = stit->tbl->it_page_shift; 382 383 mem = mm_iommu_lookup(stt->kvm->mm, ua, 1ULL << shift); 384 if (!mem || mm_iommu_ua_to_hpa(mem, ua, shift, &hpa)) { 385 rcu_read_unlock(); 386 return H_TOO_HARD; 387 } 388 } 389 rcu_read_unlock(); 390 391 return H_SUCCESS; 392} 393 394/* 395 * Handles TCE requests for emulated devices. 396 * Puts guest TCE values to the table and expects user space to convert them. 397 * Cannot fail so kvmppc_tce_validate must be called before it. 398 */ 399static void kvmppc_tce_put(struct kvmppc_spapr_tce_table *stt, 400 unsigned long idx, unsigned long tce) 401{ 402 struct page *page; 403 u64 *tbl; 404 unsigned long sttpage; 405 406 idx -= stt->offset; 407 sttpage = idx / TCES_PER_PAGE; 408 page = stt->pages[sttpage]; 409 410 if (!page) { 411 /* We allow any TCE, not just with read|write permissions */ 412 if (!tce) 413 return; 414 415 page = kvm_spapr_get_tce_page(stt, sttpage); 416 if (!page) 417 return; 418 } 419 tbl = page_to_virt(page); 420 421 tbl[idx % TCES_PER_PAGE] = tce; 422} 423 424static void kvmppc_clear_tce(struct mm_struct *mm, struct kvmppc_spapr_tce_table *stt, 425 struct iommu_table *tbl, unsigned long entry) 426{ 427 unsigned long i; 428 unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift); 429 unsigned long io_entry = entry << (stt->page_shift - tbl->it_page_shift); 430 431 for (i = 0; i < subpages; ++i) { 432 unsigned long hpa = 0; 433 enum dma_data_direction dir = DMA_NONE; 434 435 iommu_tce_xchg_no_kill(mm, tbl, io_entry + i, &hpa, &dir); 436 } 437} 438 439static long kvmppc_tce_iommu_mapped_dec(struct kvm *kvm, 440 struct iommu_table *tbl, unsigned long entry) 441{ 442 struct mm_iommu_table_group_mem_t *mem = NULL; 443 const unsigned long pgsize = 1ULL << tbl->it_page_shift; 444 __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl, entry); 445 446 if (!pua) 447 return H_SUCCESS; 448 449 mem = mm_iommu_lookup(kvm->mm, be64_to_cpu(*pua), pgsize); 450 if (!mem) 451 return H_TOO_HARD; 452 453 mm_iommu_mapped_dec(mem); 454 455 *pua = cpu_to_be64(0); 456 457 return H_SUCCESS; 458} 459 460static long kvmppc_tce_iommu_do_unmap(struct kvm *kvm, 461 struct iommu_table *tbl, unsigned long entry) 462{ 463 enum dma_data_direction dir = DMA_NONE; 464 unsigned long hpa = 0; 465 long ret; 466 467 if (WARN_ON_ONCE(iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, 468 &dir))) 469 return H_TOO_HARD; 470 471 if (dir == DMA_NONE) 472 return H_SUCCESS; 473 474 ret = kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry); 475 if (ret != H_SUCCESS) 476 iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, &dir); 477 478 return ret; 479} 480 481static long kvmppc_tce_iommu_unmap(struct kvm *kvm, 482 struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl, 483 unsigned long entry) 484{ 485 unsigned long i, ret = H_SUCCESS; 486 unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift); 487 unsigned long io_entry = entry * subpages; 488 489 for (i = 0; i < subpages; ++i) { 490 ret = kvmppc_tce_iommu_do_unmap(kvm, tbl, io_entry + i); 491 if (ret != H_SUCCESS) 492 break; 493 } 494 495 iommu_tce_kill(tbl, io_entry, subpages); 496 497 return ret; 498} 499 500static long kvmppc_tce_iommu_do_map(struct kvm *kvm, struct iommu_table *tbl, 501 unsigned long entry, unsigned long ua, 502 enum dma_data_direction dir) 503{ 504 long ret; 505 unsigned long hpa; 506 __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry); 507 struct mm_iommu_table_group_mem_t *mem; 508 509 if (!pua) 510 /* it_userspace allocation might be delayed */ 511 return H_TOO_HARD; 512 513 mem = mm_iommu_lookup(kvm->mm, ua, 1ULL << tbl->it_page_shift); 514 if (!mem) 515 /* This only handles v2 IOMMU type, v1 is handled via ioctl() */ 516 return H_TOO_HARD; 517 518 if (WARN_ON_ONCE(mm_iommu_ua_to_hpa(mem, ua, tbl->it_page_shift, &hpa))) 519 return H_TOO_HARD; 520 521 if (mm_iommu_mapped_inc(mem)) 522 return H_TOO_HARD; 523 524 ret = iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, &dir); 525 if (WARN_ON_ONCE(ret)) { 526 mm_iommu_mapped_dec(mem); 527 return H_TOO_HARD; 528 } 529 530 if (dir != DMA_NONE) 531 kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry); 532 533 *pua = cpu_to_be64(ua); 534 535 return 0; 536} 537 538static long kvmppc_tce_iommu_map(struct kvm *kvm, 539 struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl, 540 unsigned long entry, unsigned long ua, 541 enum dma_data_direction dir) 542{ 543 unsigned long i, pgoff, ret = H_SUCCESS; 544 unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift); 545 unsigned long io_entry = entry * subpages; 546 547 for (i = 0, pgoff = 0; i < subpages; 548 ++i, pgoff += IOMMU_PAGE_SIZE(tbl)) { 549 550 ret = kvmppc_tce_iommu_do_map(kvm, tbl, 551 io_entry + i, ua + pgoff, dir); 552 if (ret != H_SUCCESS) 553 break; 554 } 555 556 iommu_tce_kill(tbl, io_entry, subpages); 557 558 return ret; 559} 560 561long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn, 562 unsigned long ioba, unsigned long tce) 563{ 564 struct kvmppc_spapr_tce_table *stt; 565 long ret, idx; 566 struct kvmppc_spapr_tce_iommu_table *stit; 567 unsigned long entry, ua = 0; 568 enum dma_data_direction dir; 569 570 /* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */ 571 /* liobn, ioba, tce); */ 572 573 stt = kvmppc_find_table(vcpu->kvm, liobn); 574 if (!stt) 575 return H_TOO_HARD; 576 577 ret = kvmppc_ioba_validate(stt, ioba, 1); 578 if (ret != H_SUCCESS) 579 return ret; 580 581 idx = srcu_read_lock(&vcpu->kvm->srcu); 582 583 ret = kvmppc_tce_validate(stt, tce); 584 if (ret != H_SUCCESS) 585 goto unlock_exit; 586 587 dir = iommu_tce_direction(tce); 588 589 if ((dir != DMA_NONE) && kvmppc_tce_to_ua(vcpu->kvm, tce, &ua)) { 590 ret = H_PARAMETER; 591 goto unlock_exit; 592 } 593 594 entry = ioba >> stt->page_shift; 595 596 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { 597 if (dir == DMA_NONE) 598 ret = kvmppc_tce_iommu_unmap(vcpu->kvm, stt, 599 stit->tbl, entry); 600 else 601 ret = kvmppc_tce_iommu_map(vcpu->kvm, stt, stit->tbl, 602 entry, ua, dir); 603 604 605 if (ret != H_SUCCESS) { 606 kvmppc_clear_tce(vcpu->kvm->mm, stt, stit->tbl, entry); 607 goto unlock_exit; 608 } 609 } 610 611 kvmppc_tce_put(stt, entry, tce); 612 613unlock_exit: 614 srcu_read_unlock(&vcpu->kvm->srcu, idx); 615 616 return ret; 617} 618EXPORT_SYMBOL_GPL(kvmppc_h_put_tce); 619 620long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu, 621 unsigned long liobn, unsigned long ioba, 622 unsigned long tce_list, unsigned long npages) 623{ 624 struct kvmppc_spapr_tce_table *stt; 625 long i, ret = H_SUCCESS, idx; 626 unsigned long entry, ua = 0; 627 u64 __user *tces; 628 u64 tce; 629 struct kvmppc_spapr_tce_iommu_table *stit; 630 631 stt = kvmppc_find_table(vcpu->kvm, liobn); 632 if (!stt) 633 return H_TOO_HARD; 634 635 entry = ioba >> stt->page_shift; 636 /* 637 * SPAPR spec says that the maximum size of the list is 512 TCEs 638 * so the whole table fits in 4K page 639 */ 640 if (npages > 512) 641 return H_PARAMETER; 642 643 if (tce_list & (SZ_4K - 1)) 644 return H_PARAMETER; 645 646 ret = kvmppc_ioba_validate(stt, ioba, npages); 647 if (ret != H_SUCCESS) 648 return ret; 649 650 idx = srcu_read_lock(&vcpu->kvm->srcu); 651 if (kvmppc_tce_to_ua(vcpu->kvm, tce_list, &ua)) { 652 ret = H_TOO_HARD; 653 goto unlock_exit; 654 } 655 tces = (u64 __user *) ua; 656 657 for (i = 0; i < npages; ++i) { 658 if (get_user(tce, tces + i)) { 659 ret = H_TOO_HARD; 660 goto unlock_exit; 661 } 662 tce = be64_to_cpu(tce); 663 664 ret = kvmppc_tce_validate(stt, tce); 665 if (ret != H_SUCCESS) 666 goto unlock_exit; 667 } 668 669 for (i = 0; i < npages; ++i) { 670 /* 671 * This looks unsafe, because we validate, then regrab 672 * the TCE from userspace which could have been changed by 673 * another thread. 674 * 675 * But it actually is safe, because the relevant checks will be 676 * re-executed in the following code. If userspace tries to 677 * change this dodgily it will result in a messier failure mode 678 * but won't threaten the host. 679 */ 680 if (get_user(tce, tces + i)) { 681 ret = H_TOO_HARD; 682 goto unlock_exit; 683 } 684 tce = be64_to_cpu(tce); 685 686 if (kvmppc_tce_to_ua(vcpu->kvm, tce, &ua)) { 687 ret = H_PARAMETER; 688 goto unlock_exit; 689 } 690 691 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { 692 ret = kvmppc_tce_iommu_map(vcpu->kvm, stt, 693 stit->tbl, entry + i, ua, 694 iommu_tce_direction(tce)); 695 696 if (ret != H_SUCCESS) { 697 kvmppc_clear_tce(vcpu->kvm->mm, stt, stit->tbl, 698 entry + i); 699 goto unlock_exit; 700 } 701 } 702 703 kvmppc_tce_put(stt, entry + i, tce); 704 } 705 706unlock_exit: 707 srcu_read_unlock(&vcpu->kvm->srcu, idx); 708 709 return ret; 710} 711EXPORT_SYMBOL_GPL(kvmppc_h_put_tce_indirect); 712 713long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu, 714 unsigned long liobn, unsigned long ioba, 715 unsigned long tce_value, unsigned long npages) 716{ 717 struct kvmppc_spapr_tce_table *stt; 718 long i, ret; 719 struct kvmppc_spapr_tce_iommu_table *stit; 720 721 stt = kvmppc_find_table(vcpu->kvm, liobn); 722 if (!stt) 723 return H_TOO_HARD; 724 725 ret = kvmppc_ioba_validate(stt, ioba, npages); 726 if (ret != H_SUCCESS) 727 return ret; 728 729 /* Check permission bits only to allow userspace poison TCE for debug */ 730 if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ)) 731 return H_PARAMETER; 732 733 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { 734 unsigned long entry = ioba >> stt->page_shift; 735 736 for (i = 0; i < npages; ++i) { 737 ret = kvmppc_tce_iommu_unmap(vcpu->kvm, stt, 738 stit->tbl, entry + i); 739 740 if (ret == H_SUCCESS) 741 continue; 742 743 if (ret == H_TOO_HARD) 744 return ret; 745 746 WARN_ON_ONCE(1); 747 kvmppc_clear_tce(vcpu->kvm->mm, stt, stit->tbl, entry + i); 748 } 749 } 750 751 for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift)) 752 kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value); 753 754 return ret; 755} 756EXPORT_SYMBOL_GPL(kvmppc_h_stuff_tce); 757