1 /* 2 * generic functions used by VFIO devices 3 * 4 * Copyright Red Hat, Inc. 2012 5 * 6 * Authors: 7 * Alex Williamson <alex.williamson@redhat.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2. See 10 * the COPYING file in the top-level directory. 11 * 12 * Based on qemu-kvm device-assignment: 13 * Adapted for KVM by Qumranet. 14 * Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com) 15 * Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com) 16 * Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com) 17 * Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com) 18 * Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com) 19 */ 20 21 #include "qemu/osdep.h" 22 #include <sys/ioctl.h> 23 #include <sys/mman.h> 24 #include <linux/vfio.h> 25 26 #include "hw/vfio/vfio-common.h" 27 #include "hw/vfio/vfio.h" 28 #include "exec/address-spaces.h" 29 #include "exec/memory.h" 30 #include "hw/hw.h" 31 #include "qemu/error-report.h" 32 #include "sysemu/kvm.h" 33 #ifdef CONFIG_KVM 34 #include "linux/kvm.h" 35 #endif 36 #include "trace.h" 37 38 struct vfio_group_head vfio_group_list = 39 QLIST_HEAD_INITIALIZER(vfio_group_list); 40 struct vfio_as_head vfio_address_spaces = 41 QLIST_HEAD_INITIALIZER(vfio_address_spaces); 42 43 #ifdef CONFIG_KVM 44 /* 45 * We have a single VFIO pseudo device per KVM VM. Once created it lives 46 * for the life of the VM. Closing the file descriptor only drops our 47 * reference to it and the device's reference to kvm. Therefore once 48 * initialized, this file descriptor is only released on QEMU exit and 49 * we'll re-use it should another vfio device be attached before then. 50 */ 51 static int vfio_kvm_device_fd = -1; 52 #endif 53 54 /* 55 * Common VFIO interrupt disable 56 */ 57 void vfio_disable_irqindex(VFIODevice *vbasedev, int index) 58 { 59 struct vfio_irq_set irq_set = { 60 .argsz = sizeof(irq_set), 61 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER, 62 .index = index, 63 .start = 0, 64 .count = 0, 65 }; 66 67 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 68 } 69 70 void vfio_unmask_single_irqindex(VFIODevice *vbasedev, int index) 71 { 72 struct vfio_irq_set irq_set = { 73 .argsz = sizeof(irq_set), 74 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK, 75 .index = index, 76 .start = 0, 77 .count = 1, 78 }; 79 80 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 81 } 82 83 void vfio_mask_single_irqindex(VFIODevice *vbasedev, int index) 84 { 85 struct vfio_irq_set irq_set = { 86 .argsz = sizeof(irq_set), 87 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK, 88 .index = index, 89 .start = 0, 90 .count = 1, 91 }; 92 93 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 94 } 95 96 /* 97 * IO Port/MMIO - Beware of the endians, VFIO is always little endian 98 */ 99 void vfio_region_write(void *opaque, hwaddr addr, 100 uint64_t data, unsigned size) 101 { 102 VFIORegion *region = opaque; 103 VFIODevice *vbasedev = region->vbasedev; 104 union { 105 uint8_t byte; 106 uint16_t word; 107 uint32_t dword; 108 uint64_t qword; 109 } buf; 110 111 switch (size) { 112 case 1: 113 buf.byte = data; 114 break; 115 case 2: 116 buf.word = cpu_to_le16(data); 117 break; 118 case 4: 119 buf.dword = cpu_to_le32(data); 120 break; 121 default: 122 hw_error("vfio: unsupported write size, %d bytes", size); 123 break; 124 } 125 126 if (pwrite(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) { 127 error_report("%s(%s:region%d+0x%"HWADDR_PRIx", 0x%"PRIx64 128 ",%d) failed: %m", 129 __func__, vbasedev->name, region->nr, 130 addr, data, size); 131 } 132 133 trace_vfio_region_write(vbasedev->name, region->nr, addr, data, size); 134 135 /* 136 * A read or write to a BAR always signals an INTx EOI. This will 137 * do nothing if not pending (including not in INTx mode). We assume 138 * that a BAR access is in response to an interrupt and that BAR 139 * accesses will service the interrupt. Unfortunately, we don't know 140 * which access will service the interrupt, so we're potentially 141 * getting quite a few host interrupts per guest interrupt. 142 */ 143 vbasedev->ops->vfio_eoi(vbasedev); 144 } 145 146 uint64_t vfio_region_read(void *opaque, 147 hwaddr addr, unsigned size) 148 { 149 VFIORegion *region = opaque; 150 VFIODevice *vbasedev = region->vbasedev; 151 union { 152 uint8_t byte; 153 uint16_t word; 154 uint32_t dword; 155 uint64_t qword; 156 } buf; 157 uint64_t data = 0; 158 159 if (pread(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) { 160 error_report("%s(%s:region%d+0x%"HWADDR_PRIx", %d) failed: %m", 161 __func__, vbasedev->name, region->nr, 162 addr, size); 163 return (uint64_t)-1; 164 } 165 switch (size) { 166 case 1: 167 data = buf.byte; 168 break; 169 case 2: 170 data = le16_to_cpu(buf.word); 171 break; 172 case 4: 173 data = le32_to_cpu(buf.dword); 174 break; 175 default: 176 hw_error("vfio: unsupported read size, %d bytes", size); 177 break; 178 } 179 180 trace_vfio_region_read(vbasedev->name, region->nr, addr, size, data); 181 182 /* Same as write above */ 183 vbasedev->ops->vfio_eoi(vbasedev); 184 185 return data; 186 } 187 188 const MemoryRegionOps vfio_region_ops = { 189 .read = vfio_region_read, 190 .write = vfio_region_write, 191 .endianness = DEVICE_LITTLE_ENDIAN, 192 }; 193 194 /* 195 * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86 196 */ 197 static int vfio_dma_unmap(VFIOContainer *container, 198 hwaddr iova, ram_addr_t size) 199 { 200 struct vfio_iommu_type1_dma_unmap unmap = { 201 .argsz = sizeof(unmap), 202 .flags = 0, 203 .iova = iova, 204 .size = size, 205 }; 206 207 if (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) { 208 error_report("VFIO_UNMAP_DMA: %d", -errno); 209 return -errno; 210 } 211 212 return 0; 213 } 214 215 static int vfio_dma_map(VFIOContainer *container, hwaddr iova, 216 ram_addr_t size, void *vaddr, bool readonly) 217 { 218 struct vfio_iommu_type1_dma_map map = { 219 .argsz = sizeof(map), 220 .flags = VFIO_DMA_MAP_FLAG_READ, 221 .vaddr = (__u64)(uintptr_t)vaddr, 222 .iova = iova, 223 .size = size, 224 }; 225 226 if (!readonly) { 227 map.flags |= VFIO_DMA_MAP_FLAG_WRITE; 228 } 229 230 /* 231 * Try the mapping, if it fails with EBUSY, unmap the region and try 232 * again. This shouldn't be necessary, but we sometimes see it in 233 * the VGA ROM space. 234 */ 235 if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 || 236 (errno == EBUSY && vfio_dma_unmap(container, iova, size) == 0 && 237 ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) { 238 return 0; 239 } 240 241 error_report("VFIO_MAP_DMA: %d", -errno); 242 return -errno; 243 } 244 245 static bool vfio_listener_skipped_section(MemoryRegionSection *section) 246 { 247 return (!memory_region_is_ram(section->mr) && 248 !memory_region_is_iommu(section->mr)) || 249 /* 250 * Sizing an enabled 64-bit BAR can cause spurious mappings to 251 * addresses in the upper part of the 64-bit address space. These 252 * are never accessed by the CPU and beyond the address width of 253 * some IOMMU hardware. TODO: VFIO should tell us the IOMMU width. 254 */ 255 section->offset_within_address_space & (1ULL << 63); 256 } 257 258 static void vfio_iommu_map_notify(Notifier *n, void *data) 259 { 260 VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n); 261 VFIOContainer *container = giommu->container; 262 IOMMUTLBEntry *iotlb = data; 263 hwaddr iova = iotlb->iova + giommu->iommu_offset; 264 MemoryRegion *mr; 265 hwaddr xlat; 266 hwaddr len = iotlb->addr_mask + 1; 267 void *vaddr; 268 int ret; 269 270 trace_vfio_iommu_map_notify(iova, iova + iotlb->addr_mask); 271 272 if (iotlb->target_as != &address_space_memory) { 273 error_report("Wrong target AS \"%s\", only system memory is allowed", 274 iotlb->target_as->name ? iotlb->target_as->name : "none"); 275 return; 276 } 277 278 /* 279 * The IOMMU TLB entry we have just covers translation through 280 * this IOMMU to its immediate target. We need to translate 281 * it the rest of the way through to memory. 282 */ 283 rcu_read_lock(); 284 mr = address_space_translate(&address_space_memory, 285 iotlb->translated_addr, 286 &xlat, &len, iotlb->perm & IOMMU_WO); 287 if (!memory_region_is_ram(mr)) { 288 error_report("iommu map to non memory area %"HWADDR_PRIx"", 289 xlat); 290 goto out; 291 } 292 /* 293 * Translation truncates length to the IOMMU page size, 294 * check that it did not truncate too much. 295 */ 296 if (len & iotlb->addr_mask) { 297 error_report("iommu has granularity incompatible with target AS"); 298 goto out; 299 } 300 301 if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) { 302 vaddr = memory_region_get_ram_ptr(mr) + xlat; 303 ret = vfio_dma_map(container, iova, 304 iotlb->addr_mask + 1, vaddr, 305 !(iotlb->perm & IOMMU_WO) || mr->readonly); 306 if (ret) { 307 error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", " 308 "0x%"HWADDR_PRIx", %p) = %d (%m)", 309 container, iova, 310 iotlb->addr_mask + 1, vaddr, ret); 311 } 312 } else { 313 ret = vfio_dma_unmap(container, iova, iotlb->addr_mask + 1); 314 if (ret) { 315 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " 316 "0x%"HWADDR_PRIx") = %d (%m)", 317 container, iova, 318 iotlb->addr_mask + 1, ret); 319 } 320 } 321 out: 322 rcu_read_unlock(); 323 } 324 325 static hwaddr vfio_container_granularity(VFIOContainer *container) 326 { 327 return (hwaddr)1 << ctz64(container->iova_pgsizes); 328 } 329 330 static void vfio_listener_region_add(MemoryListener *listener, 331 MemoryRegionSection *section) 332 { 333 VFIOContainer *container = container_of(listener, VFIOContainer, listener); 334 hwaddr iova, end; 335 Int128 llend, llsize; 336 void *vaddr; 337 int ret; 338 339 if (vfio_listener_skipped_section(section)) { 340 trace_vfio_listener_region_add_skip( 341 section->offset_within_address_space, 342 section->offset_within_address_space + 343 int128_get64(int128_sub(section->size, int128_one()))); 344 return; 345 } 346 347 if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) != 348 (section->offset_within_region & ~TARGET_PAGE_MASK))) { 349 error_report("%s received unaligned region", __func__); 350 return; 351 } 352 353 iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); 354 llend = int128_make64(section->offset_within_address_space); 355 llend = int128_add(llend, section->size); 356 llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); 357 358 if (int128_ge(int128_make64(iova), llend)) { 359 return; 360 } 361 end = int128_get64(int128_sub(llend, int128_one())); 362 363 if ((iova < container->min_iova) || (end > container->max_iova)) { 364 error_report("vfio: IOMMU container %p can't map guest IOVA region" 365 " 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx, 366 container, iova, end); 367 ret = -EFAULT; 368 goto fail; 369 } 370 371 memory_region_ref(section->mr); 372 373 if (memory_region_is_iommu(section->mr)) { 374 VFIOGuestIOMMU *giommu; 375 376 trace_vfio_listener_region_add_iommu(iova, end); 377 /* 378 * FIXME: We should do some checking to see if the 379 * capabilities of the host VFIO IOMMU are adequate to model 380 * the guest IOMMU 381 * 382 * FIXME: For VFIO iommu types which have KVM acceleration to 383 * avoid bouncing all map/unmaps through qemu this way, this 384 * would be the right place to wire that up (tell the KVM 385 * device emulation the VFIO iommu handles to use). 386 */ 387 giommu = g_malloc0(sizeof(*giommu)); 388 giommu->iommu = section->mr; 389 giommu->iommu_offset = section->offset_within_address_space - 390 section->offset_within_region; 391 giommu->container = container; 392 giommu->n.notify = vfio_iommu_map_notify; 393 QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next); 394 395 memory_region_register_iommu_notifier(giommu->iommu, &giommu->n); 396 memory_region_iommu_replay(giommu->iommu, &giommu->n, 397 vfio_container_granularity(container), 398 false); 399 400 return; 401 } 402 403 /* Here we assume that memory_region_is_ram(section->mr)==true */ 404 405 vaddr = memory_region_get_ram_ptr(section->mr) + 406 section->offset_within_region + 407 (iova - section->offset_within_address_space); 408 409 trace_vfio_listener_region_add_ram(iova, end, vaddr); 410 411 llsize = int128_sub(llend, int128_make64(iova)); 412 413 ret = vfio_dma_map(container, iova, int128_get64(llsize), 414 vaddr, section->readonly); 415 if (ret) { 416 error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", " 417 "0x%"HWADDR_PRIx", %p) = %d (%m)", 418 container, iova, int128_get64(llsize), vaddr, ret); 419 goto fail; 420 } 421 422 return; 423 424 fail: 425 /* 426 * On the initfn path, store the first error in the container so we 427 * can gracefully fail. Runtime, there's not much we can do other 428 * than throw a hardware error. 429 */ 430 if (!container->initialized) { 431 if (!container->error) { 432 container->error = ret; 433 } 434 } else { 435 hw_error("vfio: DMA mapping failed, unable to continue"); 436 } 437 } 438 439 static void vfio_listener_region_del(MemoryListener *listener, 440 MemoryRegionSection *section) 441 { 442 VFIOContainer *container = container_of(listener, VFIOContainer, listener); 443 hwaddr iova, end; 444 Int128 llend, llsize; 445 int ret; 446 447 if (vfio_listener_skipped_section(section)) { 448 trace_vfio_listener_region_del_skip( 449 section->offset_within_address_space, 450 section->offset_within_address_space + 451 int128_get64(int128_sub(section->size, int128_one()))); 452 return; 453 } 454 455 if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) != 456 (section->offset_within_region & ~TARGET_PAGE_MASK))) { 457 error_report("%s received unaligned region", __func__); 458 return; 459 } 460 461 if (memory_region_is_iommu(section->mr)) { 462 VFIOGuestIOMMU *giommu; 463 464 QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) { 465 if (giommu->iommu == section->mr) { 466 memory_region_unregister_iommu_notifier(&giommu->n); 467 QLIST_REMOVE(giommu, giommu_next); 468 g_free(giommu); 469 break; 470 } 471 } 472 473 /* 474 * FIXME: We assume the one big unmap below is adequate to 475 * remove any individual page mappings in the IOMMU which 476 * might have been copied into VFIO. This works for a page table 477 * based IOMMU where a big unmap flattens a large range of IO-PTEs. 478 * That may not be true for all IOMMU types. 479 */ 480 } 481 482 iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); 483 llend = int128_make64(section->offset_within_address_space); 484 llend = int128_add(llend, section->size); 485 llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); 486 487 if (int128_ge(int128_make64(iova), llend)) { 488 return; 489 } 490 end = int128_get64(int128_sub(llend, int128_one())); 491 492 llsize = int128_sub(llend, int128_make64(iova)); 493 494 trace_vfio_listener_region_del(iova, end); 495 496 ret = vfio_dma_unmap(container, iova, int128_get64(llsize)); 497 memory_region_unref(section->mr); 498 if (ret) { 499 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " 500 "0x%"HWADDR_PRIx") = %d (%m)", 501 container, iova, int128_get64(llsize), ret); 502 } 503 } 504 505 static const MemoryListener vfio_memory_listener = { 506 .region_add = vfio_listener_region_add, 507 .region_del = vfio_listener_region_del, 508 }; 509 510 static void vfio_listener_release(VFIOContainer *container) 511 { 512 memory_listener_unregister(&container->listener); 513 } 514 515 static struct vfio_info_cap_header * 516 vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id) 517 { 518 struct vfio_info_cap_header *hdr; 519 void *ptr = info; 520 521 if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) { 522 return NULL; 523 } 524 525 for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) { 526 if (hdr->id == id) { 527 return hdr; 528 } 529 } 530 531 return NULL; 532 } 533 534 static void vfio_setup_region_sparse_mmaps(VFIORegion *region, 535 struct vfio_region_info *info) 536 { 537 struct vfio_info_cap_header *hdr; 538 struct vfio_region_info_cap_sparse_mmap *sparse; 539 int i; 540 541 hdr = vfio_get_region_info_cap(info, VFIO_REGION_INFO_CAP_SPARSE_MMAP); 542 if (!hdr) { 543 return; 544 } 545 546 sparse = container_of(hdr, struct vfio_region_info_cap_sparse_mmap, header); 547 548 trace_vfio_region_sparse_mmap_header(region->vbasedev->name, 549 region->nr, sparse->nr_areas); 550 551 region->nr_mmaps = sparse->nr_areas; 552 region->mmaps = g_new0(VFIOMmap, region->nr_mmaps); 553 554 for (i = 0; i < region->nr_mmaps; i++) { 555 region->mmaps[i].offset = sparse->areas[i].offset; 556 region->mmaps[i].size = sparse->areas[i].size; 557 trace_vfio_region_sparse_mmap_entry(i, region->mmaps[i].offset, 558 region->mmaps[i].offset + 559 region->mmaps[i].size); 560 } 561 } 562 563 int vfio_region_setup(Object *obj, VFIODevice *vbasedev, VFIORegion *region, 564 int index, const char *name) 565 { 566 struct vfio_region_info *info; 567 int ret; 568 569 ret = vfio_get_region_info(vbasedev, index, &info); 570 if (ret) { 571 return ret; 572 } 573 574 region->vbasedev = vbasedev; 575 region->flags = info->flags; 576 region->size = info->size; 577 region->fd_offset = info->offset; 578 region->nr = index; 579 580 if (region->size) { 581 region->mem = g_new0(MemoryRegion, 1); 582 memory_region_init_io(region->mem, obj, &vfio_region_ops, 583 region, name, region->size); 584 585 if (!vbasedev->no_mmap && 586 region->flags & VFIO_REGION_INFO_FLAG_MMAP && 587 !(region->size & ~qemu_real_host_page_mask)) { 588 589 vfio_setup_region_sparse_mmaps(region, info); 590 591 if (!region->nr_mmaps) { 592 region->nr_mmaps = 1; 593 region->mmaps = g_new0(VFIOMmap, region->nr_mmaps); 594 region->mmaps[0].offset = 0; 595 region->mmaps[0].size = region->size; 596 } 597 } 598 } 599 600 g_free(info); 601 602 trace_vfio_region_setup(vbasedev->name, index, name, 603 region->flags, region->fd_offset, region->size); 604 return 0; 605 } 606 607 int vfio_region_mmap(VFIORegion *region) 608 { 609 int i, prot = 0; 610 char *name; 611 612 if (!region->mem) { 613 return 0; 614 } 615 616 prot |= region->flags & VFIO_REGION_INFO_FLAG_READ ? PROT_READ : 0; 617 prot |= region->flags & VFIO_REGION_INFO_FLAG_WRITE ? PROT_WRITE : 0; 618 619 for (i = 0; i < region->nr_mmaps; i++) { 620 region->mmaps[i].mmap = mmap(NULL, region->mmaps[i].size, prot, 621 MAP_SHARED, region->vbasedev->fd, 622 region->fd_offset + 623 region->mmaps[i].offset); 624 if (region->mmaps[i].mmap == MAP_FAILED) { 625 int ret = -errno; 626 627 trace_vfio_region_mmap_fault(memory_region_name(region->mem), i, 628 region->fd_offset + 629 region->mmaps[i].offset, 630 region->fd_offset + 631 region->mmaps[i].offset + 632 region->mmaps[i].size - 1, ret); 633 634 region->mmaps[i].mmap = NULL; 635 636 for (i--; i >= 0; i--) { 637 memory_region_del_subregion(region->mem, ®ion->mmaps[i].mem); 638 munmap(region->mmaps[i].mmap, region->mmaps[i].size); 639 object_unparent(OBJECT(®ion->mmaps[i].mem)); 640 region->mmaps[i].mmap = NULL; 641 } 642 643 return ret; 644 } 645 646 name = g_strdup_printf("%s mmaps[%d]", 647 memory_region_name(region->mem), i); 648 memory_region_init_ram_ptr(®ion->mmaps[i].mem, 649 memory_region_owner(region->mem), 650 name, region->mmaps[i].size, 651 region->mmaps[i].mmap); 652 g_free(name); 653 memory_region_set_skip_dump(®ion->mmaps[i].mem); 654 memory_region_add_subregion(region->mem, region->mmaps[i].offset, 655 ®ion->mmaps[i].mem); 656 657 trace_vfio_region_mmap(memory_region_name(®ion->mmaps[i].mem), 658 region->mmaps[i].offset, 659 region->mmaps[i].offset + 660 region->mmaps[i].size - 1); 661 } 662 663 return 0; 664 } 665 666 void vfio_region_exit(VFIORegion *region) 667 { 668 int i; 669 670 if (!region->mem) { 671 return; 672 } 673 674 for (i = 0; i < region->nr_mmaps; i++) { 675 if (region->mmaps[i].mmap) { 676 memory_region_del_subregion(region->mem, ®ion->mmaps[i].mem); 677 } 678 } 679 680 trace_vfio_region_exit(region->vbasedev->name, region->nr); 681 } 682 683 void vfio_region_finalize(VFIORegion *region) 684 { 685 int i; 686 687 if (!region->mem) { 688 return; 689 } 690 691 for (i = 0; i < region->nr_mmaps; i++) { 692 if (region->mmaps[i].mmap) { 693 munmap(region->mmaps[i].mmap, region->mmaps[i].size); 694 object_unparent(OBJECT(®ion->mmaps[i].mem)); 695 } 696 } 697 698 object_unparent(OBJECT(region->mem)); 699 700 g_free(region->mem); 701 g_free(region->mmaps); 702 703 trace_vfio_region_finalize(region->vbasedev->name, region->nr); 704 } 705 706 void vfio_region_mmaps_set_enabled(VFIORegion *region, bool enabled) 707 { 708 int i; 709 710 if (!region->mem) { 711 return; 712 } 713 714 for (i = 0; i < region->nr_mmaps; i++) { 715 if (region->mmaps[i].mmap) { 716 memory_region_set_enabled(®ion->mmaps[i].mem, enabled); 717 } 718 } 719 720 trace_vfio_region_mmaps_set_enabled(memory_region_name(region->mem), 721 enabled); 722 } 723 724 void vfio_reset_handler(void *opaque) 725 { 726 VFIOGroup *group; 727 VFIODevice *vbasedev; 728 729 QLIST_FOREACH(group, &vfio_group_list, next) { 730 QLIST_FOREACH(vbasedev, &group->device_list, next) { 731 vbasedev->ops->vfio_compute_needs_reset(vbasedev); 732 } 733 } 734 735 QLIST_FOREACH(group, &vfio_group_list, next) { 736 QLIST_FOREACH(vbasedev, &group->device_list, next) { 737 if (vbasedev->needs_reset) { 738 vbasedev->ops->vfio_hot_reset_multi(vbasedev); 739 } 740 } 741 } 742 } 743 744 static void vfio_kvm_device_add_group(VFIOGroup *group) 745 { 746 #ifdef CONFIG_KVM 747 struct kvm_device_attr attr = { 748 .group = KVM_DEV_VFIO_GROUP, 749 .attr = KVM_DEV_VFIO_GROUP_ADD, 750 .addr = (uint64_t)(unsigned long)&group->fd, 751 }; 752 753 if (!kvm_enabled()) { 754 return; 755 } 756 757 if (vfio_kvm_device_fd < 0) { 758 struct kvm_create_device cd = { 759 .type = KVM_DEV_TYPE_VFIO, 760 }; 761 762 if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) { 763 error_report("Failed to create KVM VFIO device: %m"); 764 return; 765 } 766 767 vfio_kvm_device_fd = cd.fd; 768 } 769 770 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 771 error_report("Failed to add group %d to KVM VFIO device: %m", 772 group->groupid); 773 } 774 #endif 775 } 776 777 static void vfio_kvm_device_del_group(VFIOGroup *group) 778 { 779 #ifdef CONFIG_KVM 780 struct kvm_device_attr attr = { 781 .group = KVM_DEV_VFIO_GROUP, 782 .attr = KVM_DEV_VFIO_GROUP_DEL, 783 .addr = (uint64_t)(unsigned long)&group->fd, 784 }; 785 786 if (vfio_kvm_device_fd < 0) { 787 return; 788 } 789 790 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 791 error_report("Failed to remove group %d from KVM VFIO device: %m", 792 group->groupid); 793 } 794 #endif 795 } 796 797 static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as) 798 { 799 VFIOAddressSpace *space; 800 801 QLIST_FOREACH(space, &vfio_address_spaces, list) { 802 if (space->as == as) { 803 return space; 804 } 805 } 806 807 /* No suitable VFIOAddressSpace, create a new one */ 808 space = g_malloc0(sizeof(*space)); 809 space->as = as; 810 QLIST_INIT(&space->containers); 811 812 QLIST_INSERT_HEAD(&vfio_address_spaces, space, list); 813 814 return space; 815 } 816 817 static void vfio_put_address_space(VFIOAddressSpace *space) 818 { 819 if (QLIST_EMPTY(&space->containers)) { 820 QLIST_REMOVE(space, list); 821 g_free(space); 822 } 823 } 824 825 static int vfio_connect_container(VFIOGroup *group, AddressSpace *as) 826 { 827 VFIOContainer *container; 828 int ret, fd; 829 VFIOAddressSpace *space; 830 831 space = vfio_get_address_space(as); 832 833 QLIST_FOREACH(container, &space->containers, next) { 834 if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) { 835 group->container = container; 836 QLIST_INSERT_HEAD(&container->group_list, group, container_next); 837 return 0; 838 } 839 } 840 841 fd = qemu_open("/dev/vfio/vfio", O_RDWR); 842 if (fd < 0) { 843 error_report("vfio: failed to open /dev/vfio/vfio: %m"); 844 ret = -errno; 845 goto put_space_exit; 846 } 847 848 ret = ioctl(fd, VFIO_GET_API_VERSION); 849 if (ret != VFIO_API_VERSION) { 850 error_report("vfio: supported vfio version: %d, " 851 "reported version: %d", VFIO_API_VERSION, ret); 852 ret = -EINVAL; 853 goto close_fd_exit; 854 } 855 856 container = g_malloc0(sizeof(*container)); 857 container->space = space; 858 container->fd = fd; 859 if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU) || 860 ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1v2_IOMMU)) { 861 bool v2 = !!ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1v2_IOMMU); 862 struct vfio_iommu_type1_info info; 863 864 ret = ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &fd); 865 if (ret) { 866 error_report("vfio: failed to set group container: %m"); 867 ret = -errno; 868 goto free_container_exit; 869 } 870 871 ret = ioctl(fd, VFIO_SET_IOMMU, 872 v2 ? VFIO_TYPE1v2_IOMMU : VFIO_TYPE1_IOMMU); 873 if (ret) { 874 error_report("vfio: failed to set iommu for container: %m"); 875 ret = -errno; 876 goto free_container_exit; 877 } 878 879 /* 880 * FIXME: This assumes that a Type1 IOMMU can map any 64-bit 881 * IOVA whatsoever. That's not actually true, but the current 882 * kernel interface doesn't tell us what it can map, and the 883 * existing Type1 IOMMUs generally support any IOVA we're 884 * going to actually try in practice. 885 */ 886 container->min_iova = 0; 887 container->max_iova = (hwaddr)-1; 888 889 /* Assume just 4K IOVA page size */ 890 container->iova_pgsizes = 0x1000; 891 info.argsz = sizeof(info); 892 ret = ioctl(fd, VFIO_IOMMU_GET_INFO, &info); 893 /* Ignore errors */ 894 if ((ret == 0) && (info.flags & VFIO_IOMMU_INFO_PGSIZES)) { 895 container->iova_pgsizes = info.iova_pgsizes; 896 } 897 } else if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_SPAPR_TCE_IOMMU)) { 898 struct vfio_iommu_spapr_tce_info info; 899 900 ret = ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &fd); 901 if (ret) { 902 error_report("vfio: failed to set group container: %m"); 903 ret = -errno; 904 goto free_container_exit; 905 } 906 ret = ioctl(fd, VFIO_SET_IOMMU, VFIO_SPAPR_TCE_IOMMU); 907 if (ret) { 908 error_report("vfio: failed to set iommu for container: %m"); 909 ret = -errno; 910 goto free_container_exit; 911 } 912 913 /* 914 * The host kernel code implementing VFIO_IOMMU_DISABLE is called 915 * when container fd is closed so we do not call it explicitly 916 * in this file. 917 */ 918 ret = ioctl(fd, VFIO_IOMMU_ENABLE); 919 if (ret) { 920 error_report("vfio: failed to enable container: %m"); 921 ret = -errno; 922 goto free_container_exit; 923 } 924 925 /* 926 * This only considers the host IOMMU's 32-bit window. At 927 * some point we need to add support for the optional 64-bit 928 * window and dynamic windows 929 */ 930 info.argsz = sizeof(info); 931 ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info); 932 if (ret) { 933 error_report("vfio: VFIO_IOMMU_SPAPR_TCE_GET_INFO failed: %m"); 934 ret = -errno; 935 goto free_container_exit; 936 } 937 container->min_iova = info.dma32_window_start; 938 container->max_iova = container->min_iova + info.dma32_window_size - 1; 939 940 /* Assume just 4K IOVA pages for now */ 941 container->iova_pgsizes = 0x1000; 942 } else { 943 error_report("vfio: No available IOMMU models"); 944 ret = -EINVAL; 945 goto free_container_exit; 946 } 947 948 container->listener = vfio_memory_listener; 949 950 memory_listener_register(&container->listener, container->space->as); 951 952 if (container->error) { 953 ret = container->error; 954 error_report("vfio: memory listener initialization failed for container"); 955 goto listener_release_exit; 956 } 957 958 container->initialized = true; 959 960 QLIST_INIT(&container->group_list); 961 QLIST_INSERT_HEAD(&space->containers, container, next); 962 963 group->container = container; 964 QLIST_INSERT_HEAD(&container->group_list, group, container_next); 965 966 return 0; 967 listener_release_exit: 968 vfio_listener_release(container); 969 970 free_container_exit: 971 g_free(container); 972 973 close_fd_exit: 974 close(fd); 975 976 put_space_exit: 977 vfio_put_address_space(space); 978 979 return ret; 980 } 981 982 static void vfio_disconnect_container(VFIOGroup *group) 983 { 984 VFIOContainer *container = group->container; 985 986 if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) { 987 error_report("vfio: error disconnecting group %d from container", 988 group->groupid); 989 } 990 991 QLIST_REMOVE(group, container_next); 992 group->container = NULL; 993 994 if (QLIST_EMPTY(&container->group_list)) { 995 VFIOAddressSpace *space = container->space; 996 VFIOGuestIOMMU *giommu, *tmp; 997 998 vfio_listener_release(container); 999 QLIST_REMOVE(container, next); 1000 1001 QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) { 1002 memory_region_unregister_iommu_notifier(&giommu->n); 1003 QLIST_REMOVE(giommu, giommu_next); 1004 g_free(giommu); 1005 } 1006 1007 trace_vfio_disconnect_container(container->fd); 1008 close(container->fd); 1009 g_free(container); 1010 1011 vfio_put_address_space(space); 1012 } 1013 } 1014 1015 VFIOGroup *vfio_get_group(int groupid, AddressSpace *as) 1016 { 1017 VFIOGroup *group; 1018 char path[32]; 1019 struct vfio_group_status status = { .argsz = sizeof(status) }; 1020 1021 QLIST_FOREACH(group, &vfio_group_list, next) { 1022 if (group->groupid == groupid) { 1023 /* Found it. Now is it already in the right context? */ 1024 if (group->container->space->as == as) { 1025 return group; 1026 } else { 1027 error_report("vfio: group %d used in multiple address spaces", 1028 group->groupid); 1029 return NULL; 1030 } 1031 } 1032 } 1033 1034 group = g_malloc0(sizeof(*group)); 1035 1036 snprintf(path, sizeof(path), "/dev/vfio/%d", groupid); 1037 group->fd = qemu_open(path, O_RDWR); 1038 if (group->fd < 0) { 1039 error_report("vfio: error opening %s: %m", path); 1040 goto free_group_exit; 1041 } 1042 1043 if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) { 1044 error_report("vfio: error getting group status: %m"); 1045 goto close_fd_exit; 1046 } 1047 1048 if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) { 1049 error_report("vfio: error, group %d is not viable, please ensure " 1050 "all devices within the iommu_group are bound to their " 1051 "vfio bus driver.", groupid); 1052 goto close_fd_exit; 1053 } 1054 1055 group->groupid = groupid; 1056 QLIST_INIT(&group->device_list); 1057 1058 if (vfio_connect_container(group, as)) { 1059 error_report("vfio: failed to setup container for group %d", groupid); 1060 goto close_fd_exit; 1061 } 1062 1063 if (QLIST_EMPTY(&vfio_group_list)) { 1064 qemu_register_reset(vfio_reset_handler, NULL); 1065 } 1066 1067 QLIST_INSERT_HEAD(&vfio_group_list, group, next); 1068 1069 vfio_kvm_device_add_group(group); 1070 1071 return group; 1072 1073 close_fd_exit: 1074 close(group->fd); 1075 1076 free_group_exit: 1077 g_free(group); 1078 1079 return NULL; 1080 } 1081 1082 void vfio_put_group(VFIOGroup *group) 1083 { 1084 if (!group || !QLIST_EMPTY(&group->device_list)) { 1085 return; 1086 } 1087 1088 vfio_kvm_device_del_group(group); 1089 vfio_disconnect_container(group); 1090 QLIST_REMOVE(group, next); 1091 trace_vfio_put_group(group->fd); 1092 close(group->fd); 1093 g_free(group); 1094 1095 if (QLIST_EMPTY(&vfio_group_list)) { 1096 qemu_unregister_reset(vfio_reset_handler, NULL); 1097 } 1098 } 1099 1100 int vfio_get_device(VFIOGroup *group, const char *name, 1101 VFIODevice *vbasedev) 1102 { 1103 struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) }; 1104 int ret, fd; 1105 1106 fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name); 1107 if (fd < 0) { 1108 error_report("vfio: error getting device %s from group %d: %m", 1109 name, group->groupid); 1110 error_printf("Verify all devices in group %d are bound to vfio-<bus> " 1111 "or pci-stub and not already in use\n", group->groupid); 1112 return fd; 1113 } 1114 1115 ret = ioctl(fd, VFIO_DEVICE_GET_INFO, &dev_info); 1116 if (ret) { 1117 error_report("vfio: error getting device info: %m"); 1118 close(fd); 1119 return ret; 1120 } 1121 1122 vbasedev->fd = fd; 1123 vbasedev->group = group; 1124 QLIST_INSERT_HEAD(&group->device_list, vbasedev, next); 1125 1126 vbasedev->num_irqs = dev_info.num_irqs; 1127 vbasedev->num_regions = dev_info.num_regions; 1128 vbasedev->flags = dev_info.flags; 1129 1130 trace_vfio_get_device(name, dev_info.flags, dev_info.num_regions, 1131 dev_info.num_irqs); 1132 1133 vbasedev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET); 1134 return 0; 1135 } 1136 1137 void vfio_put_base_device(VFIODevice *vbasedev) 1138 { 1139 if (!vbasedev->group) { 1140 return; 1141 } 1142 QLIST_REMOVE(vbasedev, next); 1143 vbasedev->group = NULL; 1144 trace_vfio_put_base_device(vbasedev->fd); 1145 close(vbasedev->fd); 1146 } 1147 1148 int vfio_get_region_info(VFIODevice *vbasedev, int index, 1149 struct vfio_region_info **info) 1150 { 1151 size_t argsz = sizeof(struct vfio_region_info); 1152 1153 *info = g_malloc0(argsz); 1154 1155 (*info)->index = index; 1156 retry: 1157 (*info)->argsz = argsz; 1158 1159 if (ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, *info)) { 1160 g_free(*info); 1161 *info = NULL; 1162 return -errno; 1163 } 1164 1165 if ((*info)->argsz > argsz) { 1166 argsz = (*info)->argsz; 1167 *info = g_realloc(*info, argsz); 1168 1169 goto retry; 1170 } 1171 1172 return 0; 1173 } 1174 1175 int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t type, 1176 uint32_t subtype, struct vfio_region_info **info) 1177 { 1178 int i; 1179 1180 for (i = 0; i < vbasedev->num_regions; i++) { 1181 struct vfio_info_cap_header *hdr; 1182 struct vfio_region_info_cap_type *cap_type; 1183 1184 if (vfio_get_region_info(vbasedev, i, info)) { 1185 continue; 1186 } 1187 1188 hdr = vfio_get_region_info_cap(*info, VFIO_REGION_INFO_CAP_TYPE); 1189 if (!hdr) { 1190 g_free(*info); 1191 continue; 1192 } 1193 1194 cap_type = container_of(hdr, struct vfio_region_info_cap_type, header); 1195 1196 trace_vfio_get_dev_region(vbasedev->name, i, 1197 cap_type->type, cap_type->subtype); 1198 1199 if (cap_type->type == type && cap_type->subtype == subtype) { 1200 return 0; 1201 } 1202 1203 g_free(*info); 1204 } 1205 1206 *info = NULL; 1207 return -ENODEV; 1208 } 1209 1210 /* 1211 * Interfaces for IBM EEH (Enhanced Error Handling) 1212 */ 1213 static bool vfio_eeh_container_ok(VFIOContainer *container) 1214 { 1215 /* 1216 * As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO 1217 * implementation is broken if there are multiple groups in a 1218 * container. The hardware works in units of Partitionable 1219 * Endpoints (== IOMMU groups) and the EEH operations naively 1220 * iterate across all groups in the container, without any logic 1221 * to make sure the groups have their state synchronized. For 1222 * certain operations (ENABLE) that might be ok, until an error 1223 * occurs, but for others (GET_STATE) it's clearly broken. 1224 */ 1225 1226 /* 1227 * XXX Once fixed kernels exist, test for them here 1228 */ 1229 1230 if (QLIST_EMPTY(&container->group_list)) { 1231 return false; 1232 } 1233 1234 if (QLIST_NEXT(QLIST_FIRST(&container->group_list), container_next)) { 1235 return false; 1236 } 1237 1238 return true; 1239 } 1240 1241 static int vfio_eeh_container_op(VFIOContainer *container, uint32_t op) 1242 { 1243 struct vfio_eeh_pe_op pe_op = { 1244 .argsz = sizeof(pe_op), 1245 .op = op, 1246 }; 1247 int ret; 1248 1249 if (!vfio_eeh_container_ok(container)) { 1250 error_report("vfio/eeh: EEH_PE_OP 0x%x: " 1251 "kernel requires a container with exactly one group", op); 1252 return -EPERM; 1253 } 1254 1255 ret = ioctl(container->fd, VFIO_EEH_PE_OP, &pe_op); 1256 if (ret < 0) { 1257 error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op); 1258 return -errno; 1259 } 1260 1261 return 0; 1262 } 1263 1264 static VFIOContainer *vfio_eeh_as_container(AddressSpace *as) 1265 { 1266 VFIOAddressSpace *space = vfio_get_address_space(as); 1267 VFIOContainer *container = NULL; 1268 1269 if (QLIST_EMPTY(&space->containers)) { 1270 /* No containers to act on */ 1271 goto out; 1272 } 1273 1274 container = QLIST_FIRST(&space->containers); 1275 1276 if (QLIST_NEXT(container, next)) { 1277 /* We don't yet have logic to synchronize EEH state across 1278 * multiple containers */ 1279 container = NULL; 1280 goto out; 1281 } 1282 1283 out: 1284 vfio_put_address_space(space); 1285 return container; 1286 } 1287 1288 bool vfio_eeh_as_ok(AddressSpace *as) 1289 { 1290 VFIOContainer *container = vfio_eeh_as_container(as); 1291 1292 return (container != NULL) && vfio_eeh_container_ok(container); 1293 } 1294 1295 int vfio_eeh_as_op(AddressSpace *as, uint32_t op) 1296 { 1297 VFIOContainer *container = vfio_eeh_as_container(as); 1298 1299 if (!container) { 1300 return -ENODEV; 1301 } 1302 return vfio_eeh_container_op(container, op); 1303 } 1304