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 #ifdef CONFIG_KVM 24 #include <linux/kvm.h> 25 #endif 26 #include <linux/vfio.h> 27 28 #include "hw/vfio/vfio-common.h" 29 #include "hw/vfio/vfio.h" 30 #include "exec/address-spaces.h" 31 #include "exec/memory.h" 32 #include "hw/hw.h" 33 #include "qemu/error-report.h" 34 #include "qemu/range.h" 35 #include "sysemu/kvm.h" 36 #include "trace.h" 37 #include "qapi/error.h" 38 39 struct vfio_group_head vfio_group_list = 40 QLIST_HEAD_INITIALIZER(vfio_group_list); 41 struct vfio_as_head vfio_address_spaces = 42 QLIST_HEAD_INITIALIZER(vfio_address_spaces); 43 44 #ifdef CONFIG_KVM 45 /* 46 * We have a single VFIO pseudo device per KVM VM. Once created it lives 47 * for the life of the VM. Closing the file descriptor only drops our 48 * reference to it and the device's reference to kvm. Therefore once 49 * initialized, this file descriptor is only released on QEMU exit and 50 * we'll re-use it should another vfio device be attached before then. 51 */ 52 static int vfio_kvm_device_fd = -1; 53 #endif 54 55 /* 56 * Common VFIO interrupt disable 57 */ 58 void vfio_disable_irqindex(VFIODevice *vbasedev, int index) 59 { 60 struct vfio_irq_set irq_set = { 61 .argsz = sizeof(irq_set), 62 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER, 63 .index = index, 64 .start = 0, 65 .count = 0, 66 }; 67 68 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 69 } 70 71 void vfio_unmask_single_irqindex(VFIODevice *vbasedev, int index) 72 { 73 struct vfio_irq_set irq_set = { 74 .argsz = sizeof(irq_set), 75 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK, 76 .index = index, 77 .start = 0, 78 .count = 1, 79 }; 80 81 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 82 } 83 84 void vfio_mask_single_irqindex(VFIODevice *vbasedev, int index) 85 { 86 struct vfio_irq_set irq_set = { 87 .argsz = sizeof(irq_set), 88 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK, 89 .index = index, 90 .start = 0, 91 .count = 1, 92 }; 93 94 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 95 } 96 97 /* 98 * IO Port/MMIO - Beware of the endians, VFIO is always little endian 99 */ 100 void vfio_region_write(void *opaque, hwaddr addr, 101 uint64_t data, unsigned size) 102 { 103 VFIORegion *region = opaque; 104 VFIODevice *vbasedev = region->vbasedev; 105 union { 106 uint8_t byte; 107 uint16_t word; 108 uint32_t dword; 109 uint64_t qword; 110 } buf; 111 112 switch (size) { 113 case 1: 114 buf.byte = data; 115 break; 116 case 2: 117 buf.word = cpu_to_le16(data); 118 break; 119 case 4: 120 buf.dword = cpu_to_le32(data); 121 break; 122 case 8: 123 buf.qword = cpu_to_le64(data); 124 break; 125 default: 126 hw_error("vfio: unsupported write size, %d bytes", size); 127 break; 128 } 129 130 if (pwrite(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) { 131 error_report("%s(%s:region%d+0x%"HWADDR_PRIx", 0x%"PRIx64 132 ",%d) failed: %m", 133 __func__, vbasedev->name, region->nr, 134 addr, data, size); 135 } 136 137 trace_vfio_region_write(vbasedev->name, region->nr, addr, data, size); 138 139 /* 140 * A read or write to a BAR always signals an INTx EOI. This will 141 * do nothing if not pending (including not in INTx mode). We assume 142 * that a BAR access is in response to an interrupt and that BAR 143 * accesses will service the interrupt. Unfortunately, we don't know 144 * which access will service the interrupt, so we're potentially 145 * getting quite a few host interrupts per guest interrupt. 146 */ 147 vbasedev->ops->vfio_eoi(vbasedev); 148 } 149 150 uint64_t vfio_region_read(void *opaque, 151 hwaddr addr, unsigned size) 152 { 153 VFIORegion *region = opaque; 154 VFIODevice *vbasedev = region->vbasedev; 155 union { 156 uint8_t byte; 157 uint16_t word; 158 uint32_t dword; 159 uint64_t qword; 160 } buf; 161 uint64_t data = 0; 162 163 if (pread(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) { 164 error_report("%s(%s:region%d+0x%"HWADDR_PRIx", %d) failed: %m", 165 __func__, vbasedev->name, region->nr, 166 addr, size); 167 return (uint64_t)-1; 168 } 169 switch (size) { 170 case 1: 171 data = buf.byte; 172 break; 173 case 2: 174 data = le16_to_cpu(buf.word); 175 break; 176 case 4: 177 data = le32_to_cpu(buf.dword); 178 break; 179 case 8: 180 data = le64_to_cpu(buf.qword); 181 break; 182 default: 183 hw_error("vfio: unsupported read size, %d bytes", size); 184 break; 185 } 186 187 trace_vfio_region_read(vbasedev->name, region->nr, addr, size, data); 188 189 /* Same as write above */ 190 vbasedev->ops->vfio_eoi(vbasedev); 191 192 return data; 193 } 194 195 const MemoryRegionOps vfio_region_ops = { 196 .read = vfio_region_read, 197 .write = vfio_region_write, 198 .endianness = DEVICE_LITTLE_ENDIAN, 199 .valid = { 200 .min_access_size = 1, 201 .max_access_size = 8, 202 }, 203 .impl = { 204 .min_access_size = 1, 205 .max_access_size = 8, 206 }, 207 }; 208 209 /* 210 * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86 211 */ 212 static int vfio_dma_unmap(VFIOContainer *container, 213 hwaddr iova, ram_addr_t size) 214 { 215 struct vfio_iommu_type1_dma_unmap unmap = { 216 .argsz = sizeof(unmap), 217 .flags = 0, 218 .iova = iova, 219 .size = size, 220 }; 221 222 if (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) { 223 error_report("VFIO_UNMAP_DMA: %d", -errno); 224 return -errno; 225 } 226 227 return 0; 228 } 229 230 static int vfio_dma_map(VFIOContainer *container, hwaddr iova, 231 ram_addr_t size, void *vaddr, bool readonly) 232 { 233 struct vfio_iommu_type1_dma_map map = { 234 .argsz = sizeof(map), 235 .flags = VFIO_DMA_MAP_FLAG_READ, 236 .vaddr = (__u64)(uintptr_t)vaddr, 237 .iova = iova, 238 .size = size, 239 }; 240 241 if (!readonly) { 242 map.flags |= VFIO_DMA_MAP_FLAG_WRITE; 243 } 244 245 /* 246 * Try the mapping, if it fails with EBUSY, unmap the region and try 247 * again. This shouldn't be necessary, but we sometimes see it in 248 * the VGA ROM space. 249 */ 250 if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 || 251 (errno == EBUSY && vfio_dma_unmap(container, iova, size) == 0 && 252 ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) { 253 return 0; 254 } 255 256 error_report("VFIO_MAP_DMA: %d", -errno); 257 return -errno; 258 } 259 260 static void vfio_host_win_add(VFIOContainer *container, 261 hwaddr min_iova, hwaddr max_iova, 262 uint64_t iova_pgsizes) 263 { 264 VFIOHostDMAWindow *hostwin; 265 266 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 267 if (ranges_overlap(hostwin->min_iova, 268 hostwin->max_iova - hostwin->min_iova + 1, 269 min_iova, 270 max_iova - min_iova + 1)) { 271 hw_error("%s: Overlapped IOMMU are not enabled", __func__); 272 } 273 } 274 275 hostwin = g_malloc0(sizeof(*hostwin)); 276 277 hostwin->min_iova = min_iova; 278 hostwin->max_iova = max_iova; 279 hostwin->iova_pgsizes = iova_pgsizes; 280 QLIST_INSERT_HEAD(&container->hostwin_list, hostwin, hostwin_next); 281 } 282 283 static int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova, 284 hwaddr max_iova) 285 { 286 VFIOHostDMAWindow *hostwin; 287 288 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 289 if (hostwin->min_iova == min_iova && hostwin->max_iova == max_iova) { 290 QLIST_REMOVE(hostwin, hostwin_next); 291 return 0; 292 } 293 } 294 295 return -1; 296 } 297 298 static bool vfio_listener_skipped_section(MemoryRegionSection *section) 299 { 300 return (!memory_region_is_ram(section->mr) && 301 !memory_region_is_iommu(section->mr)) || 302 /* 303 * Sizing an enabled 64-bit BAR can cause spurious mappings to 304 * addresses in the upper part of the 64-bit address space. These 305 * are never accessed by the CPU and beyond the address width of 306 * some IOMMU hardware. TODO: VFIO should tell us the IOMMU width. 307 */ 308 section->offset_within_address_space & (1ULL << 63); 309 } 310 311 /* Called with rcu_read_lock held. */ 312 static bool vfio_get_vaddr(IOMMUTLBEntry *iotlb, void **vaddr, 313 bool *read_only) 314 { 315 MemoryRegion *mr; 316 hwaddr xlat; 317 hwaddr len = iotlb->addr_mask + 1; 318 bool writable = iotlb->perm & IOMMU_WO; 319 320 /* 321 * The IOMMU TLB entry we have just covers translation through 322 * this IOMMU to its immediate target. We need to translate 323 * it the rest of the way through to memory. 324 */ 325 mr = address_space_translate(&address_space_memory, 326 iotlb->translated_addr, 327 &xlat, &len, writable); 328 if (!memory_region_is_ram(mr)) { 329 error_report("iommu map to non memory area %"HWADDR_PRIx"", 330 xlat); 331 return false; 332 } 333 334 /* 335 * Translation truncates length to the IOMMU page size, 336 * check that it did not truncate too much. 337 */ 338 if (len & iotlb->addr_mask) { 339 error_report("iommu has granularity incompatible with target AS"); 340 return false; 341 } 342 343 *vaddr = memory_region_get_ram_ptr(mr) + xlat; 344 *read_only = !writable || mr->readonly; 345 346 return true; 347 } 348 349 static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) 350 { 351 VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n); 352 VFIOContainer *container = giommu->container; 353 hwaddr iova = iotlb->iova + giommu->iommu_offset; 354 bool read_only; 355 void *vaddr; 356 int ret; 357 358 trace_vfio_iommu_map_notify(iotlb->perm == IOMMU_NONE ? "UNMAP" : "MAP", 359 iova, iova + iotlb->addr_mask); 360 361 if (iotlb->target_as != &address_space_memory) { 362 error_report("Wrong target AS \"%s\", only system memory is allowed", 363 iotlb->target_as->name ? iotlb->target_as->name : "none"); 364 return; 365 } 366 367 rcu_read_lock(); 368 369 if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) { 370 if (!vfio_get_vaddr(iotlb, &vaddr, &read_only)) { 371 goto out; 372 } 373 /* 374 * vaddr is only valid until rcu_read_unlock(). But after 375 * vfio_dma_map has set up the mapping the pages will be 376 * pinned by the kernel. This makes sure that the RAM backend 377 * of vaddr will always be there, even if the memory object is 378 * destroyed and its backing memory munmap-ed. 379 */ 380 ret = vfio_dma_map(container, iova, 381 iotlb->addr_mask + 1, vaddr, 382 read_only); 383 if (ret) { 384 error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", " 385 "0x%"HWADDR_PRIx", %p) = %d (%m)", 386 container, iova, 387 iotlb->addr_mask + 1, vaddr, ret); 388 } 389 } else { 390 ret = vfio_dma_unmap(container, iova, iotlb->addr_mask + 1); 391 if (ret) { 392 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " 393 "0x%"HWADDR_PRIx") = %d (%m)", 394 container, iova, 395 iotlb->addr_mask + 1, ret); 396 } 397 } 398 out: 399 rcu_read_unlock(); 400 } 401 402 static void vfio_listener_region_add(MemoryListener *listener, 403 MemoryRegionSection *section) 404 { 405 VFIOContainer *container = container_of(listener, VFIOContainer, listener); 406 hwaddr iova, end; 407 Int128 llend, llsize; 408 void *vaddr; 409 int ret; 410 VFIOHostDMAWindow *hostwin; 411 bool hostwin_found; 412 413 if (vfio_listener_skipped_section(section)) { 414 trace_vfio_listener_region_add_skip( 415 section->offset_within_address_space, 416 section->offset_within_address_space + 417 int128_get64(int128_sub(section->size, int128_one()))); 418 return; 419 } 420 421 if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) != 422 (section->offset_within_region & ~TARGET_PAGE_MASK))) { 423 error_report("%s received unaligned region", __func__); 424 return; 425 } 426 427 iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); 428 llend = int128_make64(section->offset_within_address_space); 429 llend = int128_add(llend, section->size); 430 llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); 431 432 if (int128_ge(int128_make64(iova), llend)) { 433 return; 434 } 435 end = int128_get64(int128_sub(llend, int128_one())); 436 437 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 438 hwaddr pgsize = 0; 439 440 /* For now intersections are not allowed, we may relax this later */ 441 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 442 if (ranges_overlap(hostwin->min_iova, 443 hostwin->max_iova - hostwin->min_iova + 1, 444 section->offset_within_address_space, 445 int128_get64(section->size))) { 446 ret = -1; 447 goto fail; 448 } 449 } 450 451 ret = vfio_spapr_create_window(container, section, &pgsize); 452 if (ret) { 453 goto fail; 454 } 455 456 vfio_host_win_add(container, section->offset_within_address_space, 457 section->offset_within_address_space + 458 int128_get64(section->size) - 1, pgsize); 459 #ifdef CONFIG_KVM 460 if (kvm_enabled()) { 461 VFIOGroup *group; 462 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr); 463 struct kvm_vfio_spapr_tce param; 464 struct kvm_device_attr attr = { 465 .group = KVM_DEV_VFIO_GROUP, 466 .attr = KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE, 467 .addr = (uint64_t)(unsigned long)¶m, 468 }; 469 470 if (!memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_SPAPR_TCE_FD, 471 ¶m.tablefd)) { 472 QLIST_FOREACH(group, &container->group_list, container_next) { 473 param.groupfd = group->fd; 474 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 475 error_report("vfio: failed to setup fd %d " 476 "for a group with fd %d: %s", 477 param.tablefd, param.groupfd, 478 strerror(errno)); 479 return; 480 } 481 trace_vfio_spapr_group_attach(param.groupfd, param.tablefd); 482 } 483 } 484 } 485 #endif 486 } 487 488 hostwin_found = false; 489 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 490 if (hostwin->min_iova <= iova && end <= hostwin->max_iova) { 491 hostwin_found = true; 492 break; 493 } 494 } 495 496 if (!hostwin_found) { 497 error_report("vfio: IOMMU container %p can't map guest IOVA region" 498 " 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx, 499 container, iova, end); 500 ret = -EFAULT; 501 goto fail; 502 } 503 504 memory_region_ref(section->mr); 505 506 if (memory_region_is_iommu(section->mr)) { 507 VFIOGuestIOMMU *giommu; 508 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr); 509 510 trace_vfio_listener_region_add_iommu(iova, end); 511 /* 512 * FIXME: For VFIO iommu types which have KVM acceleration to 513 * avoid bouncing all map/unmaps through qemu this way, this 514 * would be the right place to wire that up (tell the KVM 515 * device emulation the VFIO iommu handles to use). 516 */ 517 giommu = g_malloc0(sizeof(*giommu)); 518 giommu->iommu = iommu_mr; 519 giommu->iommu_offset = section->offset_within_address_space - 520 section->offset_within_region; 521 giommu->container = container; 522 llend = int128_add(int128_make64(section->offset_within_region), 523 section->size); 524 llend = int128_sub(llend, int128_one()); 525 iommu_notifier_init(&giommu->n, vfio_iommu_map_notify, 526 IOMMU_NOTIFIER_ALL, 527 section->offset_within_region, 528 int128_get64(llend)); 529 QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next); 530 531 memory_region_register_iommu_notifier(section->mr, &giommu->n); 532 memory_region_iommu_replay(giommu->iommu, &giommu->n); 533 534 return; 535 } 536 537 /* Here we assume that memory_region_is_ram(section->mr)==true */ 538 539 vaddr = memory_region_get_ram_ptr(section->mr) + 540 section->offset_within_region + 541 (iova - section->offset_within_address_space); 542 543 trace_vfio_listener_region_add_ram(iova, end, vaddr); 544 545 llsize = int128_sub(llend, int128_make64(iova)); 546 547 if (memory_region_is_ram_device(section->mr)) { 548 hwaddr pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; 549 550 if ((iova & pgmask) || (int128_get64(llsize) & pgmask)) { 551 trace_vfio_listener_region_add_no_dma_map( 552 memory_region_name(section->mr), 553 section->offset_within_address_space, 554 int128_getlo(section->size), 555 pgmask + 1); 556 return; 557 } 558 } 559 560 ret = vfio_dma_map(container, iova, int128_get64(llsize), 561 vaddr, section->readonly); 562 if (ret) { 563 error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", " 564 "0x%"HWADDR_PRIx", %p) = %d (%m)", 565 container, iova, int128_get64(llsize), vaddr, ret); 566 if (memory_region_is_ram_device(section->mr)) { 567 /* Allow unexpected mappings not to be fatal for RAM devices */ 568 return; 569 } 570 goto fail; 571 } 572 573 return; 574 575 fail: 576 if (memory_region_is_ram_device(section->mr)) { 577 error_report("failed to vfio_dma_map. pci p2p may not work"); 578 return; 579 } 580 /* 581 * On the initfn path, store the first error in the container so we 582 * can gracefully fail. Runtime, there's not much we can do other 583 * than throw a hardware error. 584 */ 585 if (!container->initialized) { 586 if (!container->error) { 587 container->error = ret; 588 } 589 } else { 590 hw_error("vfio: DMA mapping failed, unable to continue"); 591 } 592 } 593 594 static void vfio_listener_region_del(MemoryListener *listener, 595 MemoryRegionSection *section) 596 { 597 VFIOContainer *container = container_of(listener, VFIOContainer, listener); 598 hwaddr iova, end; 599 Int128 llend, llsize; 600 int ret; 601 bool try_unmap = true; 602 603 if (vfio_listener_skipped_section(section)) { 604 trace_vfio_listener_region_del_skip( 605 section->offset_within_address_space, 606 section->offset_within_address_space + 607 int128_get64(int128_sub(section->size, int128_one()))); 608 return; 609 } 610 611 if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) != 612 (section->offset_within_region & ~TARGET_PAGE_MASK))) { 613 error_report("%s received unaligned region", __func__); 614 return; 615 } 616 617 if (memory_region_is_iommu(section->mr)) { 618 VFIOGuestIOMMU *giommu; 619 620 QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) { 621 if (MEMORY_REGION(giommu->iommu) == section->mr && 622 giommu->n.start == section->offset_within_region) { 623 memory_region_unregister_iommu_notifier(section->mr, 624 &giommu->n); 625 QLIST_REMOVE(giommu, giommu_next); 626 g_free(giommu); 627 break; 628 } 629 } 630 631 /* 632 * FIXME: We assume the one big unmap below is adequate to 633 * remove any individual page mappings in the IOMMU which 634 * might have been copied into VFIO. This works for a page table 635 * based IOMMU where a big unmap flattens a large range of IO-PTEs. 636 * That may not be true for all IOMMU types. 637 */ 638 } 639 640 iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); 641 llend = int128_make64(section->offset_within_address_space); 642 llend = int128_add(llend, section->size); 643 llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); 644 645 if (int128_ge(int128_make64(iova), llend)) { 646 return; 647 } 648 end = int128_get64(int128_sub(llend, int128_one())); 649 650 llsize = int128_sub(llend, int128_make64(iova)); 651 652 trace_vfio_listener_region_del(iova, end); 653 654 if (memory_region_is_ram_device(section->mr)) { 655 hwaddr pgmask; 656 VFIOHostDMAWindow *hostwin; 657 bool hostwin_found = false; 658 659 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 660 if (hostwin->min_iova <= iova && end <= hostwin->max_iova) { 661 hostwin_found = true; 662 break; 663 } 664 } 665 assert(hostwin_found); /* or region_add() would have failed */ 666 667 pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; 668 try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask)); 669 } 670 671 if (try_unmap) { 672 ret = vfio_dma_unmap(container, iova, int128_get64(llsize)); 673 if (ret) { 674 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " 675 "0x%"HWADDR_PRIx") = %d (%m)", 676 container, iova, int128_get64(llsize), ret); 677 } 678 } 679 680 memory_region_unref(section->mr); 681 682 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 683 vfio_spapr_remove_window(container, 684 section->offset_within_address_space); 685 if (vfio_host_win_del(container, 686 section->offset_within_address_space, 687 section->offset_within_address_space + 688 int128_get64(section->size) - 1) < 0) { 689 hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx, 690 __func__, section->offset_within_address_space); 691 } 692 } 693 } 694 695 static const MemoryListener vfio_memory_listener = { 696 .region_add = vfio_listener_region_add, 697 .region_del = vfio_listener_region_del, 698 }; 699 700 static void vfio_listener_release(VFIOContainer *container) 701 { 702 memory_listener_unregister(&container->listener); 703 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 704 memory_listener_unregister(&container->prereg_listener); 705 } 706 } 707 708 static struct vfio_info_cap_header * 709 vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id) 710 { 711 struct vfio_info_cap_header *hdr; 712 void *ptr = info; 713 714 if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) { 715 return NULL; 716 } 717 718 for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) { 719 if (hdr->id == id) { 720 return hdr; 721 } 722 } 723 724 return NULL; 725 } 726 727 static int vfio_setup_region_sparse_mmaps(VFIORegion *region, 728 struct vfio_region_info *info) 729 { 730 struct vfio_info_cap_header *hdr; 731 struct vfio_region_info_cap_sparse_mmap *sparse; 732 int i, j; 733 734 hdr = vfio_get_region_info_cap(info, VFIO_REGION_INFO_CAP_SPARSE_MMAP); 735 if (!hdr) { 736 return -ENODEV; 737 } 738 739 sparse = container_of(hdr, struct vfio_region_info_cap_sparse_mmap, header); 740 741 trace_vfio_region_sparse_mmap_header(region->vbasedev->name, 742 region->nr, sparse->nr_areas); 743 744 region->mmaps = g_new0(VFIOMmap, sparse->nr_areas); 745 746 for (i = 0, j = 0; i < sparse->nr_areas; i++) { 747 trace_vfio_region_sparse_mmap_entry(i, sparse->areas[i].offset, 748 sparse->areas[i].offset + 749 sparse->areas[i].size); 750 751 if (sparse->areas[i].size) { 752 region->mmaps[j].offset = sparse->areas[i].offset; 753 region->mmaps[j].size = sparse->areas[i].size; 754 j++; 755 } 756 } 757 758 region->nr_mmaps = j; 759 region->mmaps = g_realloc(region->mmaps, j * sizeof(VFIOMmap)); 760 761 return 0; 762 } 763 764 int vfio_region_setup(Object *obj, VFIODevice *vbasedev, VFIORegion *region, 765 int index, const char *name) 766 { 767 struct vfio_region_info *info; 768 int ret; 769 770 ret = vfio_get_region_info(vbasedev, index, &info); 771 if (ret) { 772 return ret; 773 } 774 775 region->vbasedev = vbasedev; 776 region->flags = info->flags; 777 region->size = info->size; 778 region->fd_offset = info->offset; 779 region->nr = index; 780 781 if (region->size) { 782 region->mem = g_new0(MemoryRegion, 1); 783 memory_region_init_io(region->mem, obj, &vfio_region_ops, 784 region, name, region->size); 785 786 if (!vbasedev->no_mmap && 787 region->flags & VFIO_REGION_INFO_FLAG_MMAP) { 788 789 ret = vfio_setup_region_sparse_mmaps(region, info); 790 791 if (ret) { 792 region->nr_mmaps = 1; 793 region->mmaps = g_new0(VFIOMmap, region->nr_mmaps); 794 region->mmaps[0].offset = 0; 795 region->mmaps[0].size = region->size; 796 } 797 } 798 } 799 800 g_free(info); 801 802 trace_vfio_region_setup(vbasedev->name, index, name, 803 region->flags, region->fd_offset, region->size); 804 return 0; 805 } 806 807 int vfio_region_mmap(VFIORegion *region) 808 { 809 int i, prot = 0; 810 char *name; 811 812 if (!region->mem) { 813 return 0; 814 } 815 816 prot |= region->flags & VFIO_REGION_INFO_FLAG_READ ? PROT_READ : 0; 817 prot |= region->flags & VFIO_REGION_INFO_FLAG_WRITE ? PROT_WRITE : 0; 818 819 for (i = 0; i < region->nr_mmaps; i++) { 820 region->mmaps[i].mmap = mmap(NULL, region->mmaps[i].size, prot, 821 MAP_SHARED, region->vbasedev->fd, 822 region->fd_offset + 823 region->mmaps[i].offset); 824 if (region->mmaps[i].mmap == MAP_FAILED) { 825 int ret = -errno; 826 827 trace_vfio_region_mmap_fault(memory_region_name(region->mem), i, 828 region->fd_offset + 829 region->mmaps[i].offset, 830 region->fd_offset + 831 region->mmaps[i].offset + 832 region->mmaps[i].size - 1, ret); 833 834 region->mmaps[i].mmap = NULL; 835 836 for (i--; i >= 0; i--) { 837 memory_region_del_subregion(region->mem, ®ion->mmaps[i].mem); 838 munmap(region->mmaps[i].mmap, region->mmaps[i].size); 839 object_unparent(OBJECT(®ion->mmaps[i].mem)); 840 region->mmaps[i].mmap = NULL; 841 } 842 843 return ret; 844 } 845 846 name = g_strdup_printf("%s mmaps[%d]", 847 memory_region_name(region->mem), i); 848 memory_region_init_ram_device_ptr(®ion->mmaps[i].mem, 849 memory_region_owner(region->mem), 850 name, region->mmaps[i].size, 851 region->mmaps[i].mmap); 852 g_free(name); 853 memory_region_add_subregion(region->mem, region->mmaps[i].offset, 854 ®ion->mmaps[i].mem); 855 856 trace_vfio_region_mmap(memory_region_name(®ion->mmaps[i].mem), 857 region->mmaps[i].offset, 858 region->mmaps[i].offset + 859 region->mmaps[i].size - 1); 860 } 861 862 return 0; 863 } 864 865 void vfio_region_exit(VFIORegion *region) 866 { 867 int i; 868 869 if (!region->mem) { 870 return; 871 } 872 873 for (i = 0; i < region->nr_mmaps; i++) { 874 if (region->mmaps[i].mmap) { 875 memory_region_del_subregion(region->mem, ®ion->mmaps[i].mem); 876 } 877 } 878 879 trace_vfio_region_exit(region->vbasedev->name, region->nr); 880 } 881 882 void vfio_region_finalize(VFIORegion *region) 883 { 884 int i; 885 886 if (!region->mem) { 887 return; 888 } 889 890 for (i = 0; i < region->nr_mmaps; i++) { 891 if (region->mmaps[i].mmap) { 892 munmap(region->mmaps[i].mmap, region->mmaps[i].size); 893 object_unparent(OBJECT(®ion->mmaps[i].mem)); 894 } 895 } 896 897 object_unparent(OBJECT(region->mem)); 898 899 g_free(region->mem); 900 g_free(region->mmaps); 901 902 trace_vfio_region_finalize(region->vbasedev->name, region->nr); 903 904 region->mem = NULL; 905 region->mmaps = NULL; 906 region->nr_mmaps = 0; 907 region->size = 0; 908 region->flags = 0; 909 region->nr = 0; 910 } 911 912 void vfio_region_mmaps_set_enabled(VFIORegion *region, bool enabled) 913 { 914 int i; 915 916 if (!region->mem) { 917 return; 918 } 919 920 for (i = 0; i < region->nr_mmaps; i++) { 921 if (region->mmaps[i].mmap) { 922 memory_region_set_enabled(®ion->mmaps[i].mem, enabled); 923 } 924 } 925 926 trace_vfio_region_mmaps_set_enabled(memory_region_name(region->mem), 927 enabled); 928 } 929 930 void vfio_reset_handler(void *opaque) 931 { 932 VFIOGroup *group; 933 VFIODevice *vbasedev; 934 935 QLIST_FOREACH(group, &vfio_group_list, next) { 936 QLIST_FOREACH(vbasedev, &group->device_list, next) { 937 if (vbasedev->dev->realized) { 938 vbasedev->ops->vfio_compute_needs_reset(vbasedev); 939 } 940 } 941 } 942 943 QLIST_FOREACH(group, &vfio_group_list, next) { 944 QLIST_FOREACH(vbasedev, &group->device_list, next) { 945 if (vbasedev->dev->realized && vbasedev->needs_reset) { 946 vbasedev->ops->vfio_hot_reset_multi(vbasedev); 947 } 948 } 949 } 950 } 951 952 static void vfio_kvm_device_add_group(VFIOGroup *group) 953 { 954 #ifdef CONFIG_KVM 955 struct kvm_device_attr attr = { 956 .group = KVM_DEV_VFIO_GROUP, 957 .attr = KVM_DEV_VFIO_GROUP_ADD, 958 .addr = (uint64_t)(unsigned long)&group->fd, 959 }; 960 961 if (!kvm_enabled()) { 962 return; 963 } 964 965 if (vfio_kvm_device_fd < 0) { 966 struct kvm_create_device cd = { 967 .type = KVM_DEV_TYPE_VFIO, 968 }; 969 970 if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) { 971 error_report("Failed to create KVM VFIO device: %m"); 972 return; 973 } 974 975 vfio_kvm_device_fd = cd.fd; 976 } 977 978 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 979 error_report("Failed to add group %d to KVM VFIO device: %m", 980 group->groupid); 981 } 982 #endif 983 } 984 985 static void vfio_kvm_device_del_group(VFIOGroup *group) 986 { 987 #ifdef CONFIG_KVM 988 struct kvm_device_attr attr = { 989 .group = KVM_DEV_VFIO_GROUP, 990 .attr = KVM_DEV_VFIO_GROUP_DEL, 991 .addr = (uint64_t)(unsigned long)&group->fd, 992 }; 993 994 if (vfio_kvm_device_fd < 0) { 995 return; 996 } 997 998 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 999 error_report("Failed to remove group %d from KVM VFIO device: %m", 1000 group->groupid); 1001 } 1002 #endif 1003 } 1004 1005 static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as) 1006 { 1007 VFIOAddressSpace *space; 1008 1009 QLIST_FOREACH(space, &vfio_address_spaces, list) { 1010 if (space->as == as) { 1011 return space; 1012 } 1013 } 1014 1015 /* No suitable VFIOAddressSpace, create a new one */ 1016 space = g_malloc0(sizeof(*space)); 1017 space->as = as; 1018 QLIST_INIT(&space->containers); 1019 1020 QLIST_INSERT_HEAD(&vfio_address_spaces, space, list); 1021 1022 return space; 1023 } 1024 1025 static void vfio_put_address_space(VFIOAddressSpace *space) 1026 { 1027 if (QLIST_EMPTY(&space->containers)) { 1028 QLIST_REMOVE(space, list); 1029 g_free(space); 1030 } 1031 } 1032 1033 static int vfio_connect_container(VFIOGroup *group, AddressSpace *as, 1034 Error **errp) 1035 { 1036 VFIOContainer *container; 1037 int ret, fd; 1038 VFIOAddressSpace *space; 1039 1040 space = vfio_get_address_space(as); 1041 1042 QLIST_FOREACH(container, &space->containers, next) { 1043 if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) { 1044 group->container = container; 1045 QLIST_INSERT_HEAD(&container->group_list, group, container_next); 1046 vfio_kvm_device_add_group(group); 1047 return 0; 1048 } 1049 } 1050 1051 fd = qemu_open("/dev/vfio/vfio", O_RDWR); 1052 if (fd < 0) { 1053 error_setg_errno(errp, errno, "failed to open /dev/vfio/vfio"); 1054 ret = -errno; 1055 goto put_space_exit; 1056 } 1057 1058 ret = ioctl(fd, VFIO_GET_API_VERSION); 1059 if (ret != VFIO_API_VERSION) { 1060 error_setg(errp, "supported vfio version: %d, " 1061 "reported version: %d", VFIO_API_VERSION, ret); 1062 ret = -EINVAL; 1063 goto close_fd_exit; 1064 } 1065 1066 container = g_malloc0(sizeof(*container)); 1067 container->space = space; 1068 container->fd = fd; 1069 QLIST_INIT(&container->giommu_list); 1070 QLIST_INIT(&container->hostwin_list); 1071 if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU) || 1072 ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1v2_IOMMU)) { 1073 bool v2 = !!ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1v2_IOMMU); 1074 struct vfio_iommu_type1_info info; 1075 1076 ret = ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &fd); 1077 if (ret) { 1078 error_setg_errno(errp, errno, "failed to set group container"); 1079 ret = -errno; 1080 goto free_container_exit; 1081 } 1082 1083 container->iommu_type = v2 ? VFIO_TYPE1v2_IOMMU : VFIO_TYPE1_IOMMU; 1084 ret = ioctl(fd, VFIO_SET_IOMMU, container->iommu_type); 1085 if (ret) { 1086 error_setg_errno(errp, errno, "failed to set iommu for container"); 1087 ret = -errno; 1088 goto free_container_exit; 1089 } 1090 1091 /* 1092 * FIXME: This assumes that a Type1 IOMMU can map any 64-bit 1093 * IOVA whatsoever. That's not actually true, but the current 1094 * kernel interface doesn't tell us what it can map, and the 1095 * existing Type1 IOMMUs generally support any IOVA we're 1096 * going to actually try in practice. 1097 */ 1098 info.argsz = sizeof(info); 1099 ret = ioctl(fd, VFIO_IOMMU_GET_INFO, &info); 1100 /* Ignore errors */ 1101 if (ret || !(info.flags & VFIO_IOMMU_INFO_PGSIZES)) { 1102 /* Assume 4k IOVA page size */ 1103 info.iova_pgsizes = 4096; 1104 } 1105 vfio_host_win_add(container, 0, (hwaddr)-1, info.iova_pgsizes); 1106 } else if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_SPAPR_TCE_IOMMU) || 1107 ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_SPAPR_TCE_v2_IOMMU)) { 1108 struct vfio_iommu_spapr_tce_info info; 1109 bool v2 = !!ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_SPAPR_TCE_v2_IOMMU); 1110 1111 ret = ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &fd); 1112 if (ret) { 1113 error_setg_errno(errp, errno, "failed to set group container"); 1114 ret = -errno; 1115 goto free_container_exit; 1116 } 1117 container->iommu_type = 1118 v2 ? VFIO_SPAPR_TCE_v2_IOMMU : VFIO_SPAPR_TCE_IOMMU; 1119 ret = ioctl(fd, VFIO_SET_IOMMU, container->iommu_type); 1120 if (ret) { 1121 container->iommu_type = VFIO_SPAPR_TCE_IOMMU; 1122 v2 = false; 1123 ret = ioctl(fd, VFIO_SET_IOMMU, container->iommu_type); 1124 } 1125 if (ret) { 1126 error_setg_errno(errp, errno, "failed to set iommu for container"); 1127 ret = -errno; 1128 goto free_container_exit; 1129 } 1130 1131 /* 1132 * The host kernel code implementing VFIO_IOMMU_DISABLE is called 1133 * when container fd is closed so we do not call it explicitly 1134 * in this file. 1135 */ 1136 if (!v2) { 1137 ret = ioctl(fd, VFIO_IOMMU_ENABLE); 1138 if (ret) { 1139 error_setg_errno(errp, errno, "failed to enable container"); 1140 ret = -errno; 1141 goto free_container_exit; 1142 } 1143 } else { 1144 container->prereg_listener = vfio_prereg_listener; 1145 1146 memory_listener_register(&container->prereg_listener, 1147 &address_space_memory); 1148 if (container->error) { 1149 memory_listener_unregister(&container->prereg_listener); 1150 ret = container->error; 1151 error_setg(errp, 1152 "RAM memory listener initialization failed for container"); 1153 goto free_container_exit; 1154 } 1155 } 1156 1157 info.argsz = sizeof(info); 1158 ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info); 1159 if (ret) { 1160 error_setg_errno(errp, errno, 1161 "VFIO_IOMMU_SPAPR_TCE_GET_INFO failed"); 1162 ret = -errno; 1163 if (v2) { 1164 memory_listener_unregister(&container->prereg_listener); 1165 } 1166 goto free_container_exit; 1167 } 1168 1169 if (v2) { 1170 /* 1171 * There is a default window in just created container. 1172 * To make region_add/del simpler, we better remove this 1173 * window now and let those iommu_listener callbacks 1174 * create/remove them when needed. 1175 */ 1176 ret = vfio_spapr_remove_window(container, info.dma32_window_start); 1177 if (ret) { 1178 error_setg_errno(errp, -ret, 1179 "failed to remove existing window"); 1180 goto free_container_exit; 1181 } 1182 } else { 1183 /* The default table uses 4K pages */ 1184 vfio_host_win_add(container, info.dma32_window_start, 1185 info.dma32_window_start + 1186 info.dma32_window_size - 1, 1187 0x1000); 1188 } 1189 } else { 1190 error_setg(errp, "No available IOMMU models"); 1191 ret = -EINVAL; 1192 goto free_container_exit; 1193 } 1194 1195 vfio_kvm_device_add_group(group); 1196 1197 QLIST_INIT(&container->group_list); 1198 QLIST_INSERT_HEAD(&space->containers, container, next); 1199 1200 group->container = container; 1201 QLIST_INSERT_HEAD(&container->group_list, group, container_next); 1202 1203 container->listener = vfio_memory_listener; 1204 1205 memory_listener_register(&container->listener, container->space->as); 1206 1207 if (container->error) { 1208 ret = container->error; 1209 error_setg_errno(errp, -ret, 1210 "memory listener initialization failed for container"); 1211 goto listener_release_exit; 1212 } 1213 1214 container->initialized = true; 1215 1216 return 0; 1217 listener_release_exit: 1218 QLIST_REMOVE(group, container_next); 1219 QLIST_REMOVE(container, next); 1220 vfio_kvm_device_del_group(group); 1221 vfio_listener_release(container); 1222 1223 free_container_exit: 1224 g_free(container); 1225 1226 close_fd_exit: 1227 close(fd); 1228 1229 put_space_exit: 1230 vfio_put_address_space(space); 1231 1232 return ret; 1233 } 1234 1235 static void vfio_disconnect_container(VFIOGroup *group) 1236 { 1237 VFIOContainer *container = group->container; 1238 1239 QLIST_REMOVE(group, container_next); 1240 group->container = NULL; 1241 1242 /* 1243 * Explicitly release the listener first before unset container, 1244 * since unset may destroy the backend container if it's the last 1245 * group. 1246 */ 1247 if (QLIST_EMPTY(&container->group_list)) { 1248 vfio_listener_release(container); 1249 } 1250 1251 if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) { 1252 error_report("vfio: error disconnecting group %d from container", 1253 group->groupid); 1254 } 1255 1256 if (QLIST_EMPTY(&container->group_list)) { 1257 VFIOAddressSpace *space = container->space; 1258 VFIOGuestIOMMU *giommu, *tmp; 1259 1260 QLIST_REMOVE(container, next); 1261 1262 QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) { 1263 memory_region_unregister_iommu_notifier( 1264 MEMORY_REGION(giommu->iommu), &giommu->n); 1265 QLIST_REMOVE(giommu, giommu_next); 1266 g_free(giommu); 1267 } 1268 1269 trace_vfio_disconnect_container(container->fd); 1270 close(container->fd); 1271 g_free(container); 1272 1273 vfio_put_address_space(space); 1274 } 1275 } 1276 1277 VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp) 1278 { 1279 VFIOGroup *group; 1280 char path[32]; 1281 struct vfio_group_status status = { .argsz = sizeof(status) }; 1282 1283 QLIST_FOREACH(group, &vfio_group_list, next) { 1284 if (group->groupid == groupid) { 1285 /* Found it. Now is it already in the right context? */ 1286 if (group->container->space->as == as) { 1287 return group; 1288 } else { 1289 error_setg(errp, "group %d used in multiple address spaces", 1290 group->groupid); 1291 return NULL; 1292 } 1293 } 1294 } 1295 1296 group = g_malloc0(sizeof(*group)); 1297 1298 snprintf(path, sizeof(path), "/dev/vfio/%d", groupid); 1299 group->fd = qemu_open(path, O_RDWR); 1300 if (group->fd < 0) { 1301 error_setg_errno(errp, errno, "failed to open %s", path); 1302 goto free_group_exit; 1303 } 1304 1305 if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) { 1306 error_setg_errno(errp, errno, "failed to get group %d status", groupid); 1307 goto close_fd_exit; 1308 } 1309 1310 if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) { 1311 error_setg(errp, "group %d is not viable", groupid); 1312 error_append_hint(errp, 1313 "Please ensure all devices within the iommu_group " 1314 "are bound to their vfio bus driver.\n"); 1315 goto close_fd_exit; 1316 } 1317 1318 group->groupid = groupid; 1319 QLIST_INIT(&group->device_list); 1320 1321 if (vfio_connect_container(group, as, errp)) { 1322 error_prepend(errp, "failed to setup container for group %d: ", 1323 groupid); 1324 goto close_fd_exit; 1325 } 1326 1327 if (QLIST_EMPTY(&vfio_group_list)) { 1328 qemu_register_reset(vfio_reset_handler, NULL); 1329 } 1330 1331 QLIST_INSERT_HEAD(&vfio_group_list, group, next); 1332 1333 return group; 1334 1335 close_fd_exit: 1336 close(group->fd); 1337 1338 free_group_exit: 1339 g_free(group); 1340 1341 return NULL; 1342 } 1343 1344 void vfio_put_group(VFIOGroup *group) 1345 { 1346 if (!group || !QLIST_EMPTY(&group->device_list)) { 1347 return; 1348 } 1349 1350 vfio_kvm_device_del_group(group); 1351 vfio_disconnect_container(group); 1352 QLIST_REMOVE(group, next); 1353 trace_vfio_put_group(group->fd); 1354 close(group->fd); 1355 g_free(group); 1356 1357 if (QLIST_EMPTY(&vfio_group_list)) { 1358 qemu_unregister_reset(vfio_reset_handler, NULL); 1359 } 1360 } 1361 1362 int vfio_get_device(VFIOGroup *group, const char *name, 1363 VFIODevice *vbasedev, Error **errp) 1364 { 1365 struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) }; 1366 int ret, fd; 1367 1368 fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name); 1369 if (fd < 0) { 1370 error_setg_errno(errp, errno, "error getting device from group %d", 1371 group->groupid); 1372 error_append_hint(errp, 1373 "Verify all devices in group %d are bound to vfio-<bus> " 1374 "or pci-stub and not already in use\n", group->groupid); 1375 return fd; 1376 } 1377 1378 ret = ioctl(fd, VFIO_DEVICE_GET_INFO, &dev_info); 1379 if (ret) { 1380 error_setg_errno(errp, errno, "error getting device info"); 1381 close(fd); 1382 return ret; 1383 } 1384 1385 vbasedev->fd = fd; 1386 vbasedev->group = group; 1387 QLIST_INSERT_HEAD(&group->device_list, vbasedev, next); 1388 1389 vbasedev->num_irqs = dev_info.num_irqs; 1390 vbasedev->num_regions = dev_info.num_regions; 1391 vbasedev->flags = dev_info.flags; 1392 1393 trace_vfio_get_device(name, dev_info.flags, dev_info.num_regions, 1394 dev_info.num_irqs); 1395 1396 vbasedev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET); 1397 return 0; 1398 } 1399 1400 void vfio_put_base_device(VFIODevice *vbasedev) 1401 { 1402 if (!vbasedev->group) { 1403 return; 1404 } 1405 QLIST_REMOVE(vbasedev, next); 1406 vbasedev->group = NULL; 1407 trace_vfio_put_base_device(vbasedev->fd); 1408 close(vbasedev->fd); 1409 } 1410 1411 int vfio_get_region_info(VFIODevice *vbasedev, int index, 1412 struct vfio_region_info **info) 1413 { 1414 size_t argsz = sizeof(struct vfio_region_info); 1415 1416 *info = g_malloc0(argsz); 1417 1418 (*info)->index = index; 1419 retry: 1420 (*info)->argsz = argsz; 1421 1422 if (ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, *info)) { 1423 g_free(*info); 1424 *info = NULL; 1425 return -errno; 1426 } 1427 1428 if ((*info)->argsz > argsz) { 1429 argsz = (*info)->argsz; 1430 *info = g_realloc(*info, argsz); 1431 1432 goto retry; 1433 } 1434 1435 return 0; 1436 } 1437 1438 int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t type, 1439 uint32_t subtype, struct vfio_region_info **info) 1440 { 1441 int i; 1442 1443 for (i = 0; i < vbasedev->num_regions; i++) { 1444 struct vfio_info_cap_header *hdr; 1445 struct vfio_region_info_cap_type *cap_type; 1446 1447 if (vfio_get_region_info(vbasedev, i, info)) { 1448 continue; 1449 } 1450 1451 hdr = vfio_get_region_info_cap(*info, VFIO_REGION_INFO_CAP_TYPE); 1452 if (!hdr) { 1453 g_free(*info); 1454 continue; 1455 } 1456 1457 cap_type = container_of(hdr, struct vfio_region_info_cap_type, header); 1458 1459 trace_vfio_get_dev_region(vbasedev->name, i, 1460 cap_type->type, cap_type->subtype); 1461 1462 if (cap_type->type == type && cap_type->subtype == subtype) { 1463 return 0; 1464 } 1465 1466 g_free(*info); 1467 } 1468 1469 *info = NULL; 1470 return -ENODEV; 1471 } 1472 1473 bool vfio_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_type) 1474 { 1475 struct vfio_region_info *info = NULL; 1476 bool ret = false; 1477 1478 if (!vfio_get_region_info(vbasedev, region, &info)) { 1479 if (vfio_get_region_info_cap(info, cap_type)) { 1480 ret = true; 1481 } 1482 g_free(info); 1483 } 1484 1485 return ret; 1486 } 1487 1488 /* 1489 * Interfaces for IBM EEH (Enhanced Error Handling) 1490 */ 1491 static bool vfio_eeh_container_ok(VFIOContainer *container) 1492 { 1493 /* 1494 * As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO 1495 * implementation is broken if there are multiple groups in a 1496 * container. The hardware works in units of Partitionable 1497 * Endpoints (== IOMMU groups) and the EEH operations naively 1498 * iterate across all groups in the container, without any logic 1499 * to make sure the groups have their state synchronized. For 1500 * certain operations (ENABLE) that might be ok, until an error 1501 * occurs, but for others (GET_STATE) it's clearly broken. 1502 */ 1503 1504 /* 1505 * XXX Once fixed kernels exist, test for them here 1506 */ 1507 1508 if (QLIST_EMPTY(&container->group_list)) { 1509 return false; 1510 } 1511 1512 if (QLIST_NEXT(QLIST_FIRST(&container->group_list), container_next)) { 1513 return false; 1514 } 1515 1516 return true; 1517 } 1518 1519 static int vfio_eeh_container_op(VFIOContainer *container, uint32_t op) 1520 { 1521 struct vfio_eeh_pe_op pe_op = { 1522 .argsz = sizeof(pe_op), 1523 .op = op, 1524 }; 1525 int ret; 1526 1527 if (!vfio_eeh_container_ok(container)) { 1528 error_report("vfio/eeh: EEH_PE_OP 0x%x: " 1529 "kernel requires a container with exactly one group", op); 1530 return -EPERM; 1531 } 1532 1533 ret = ioctl(container->fd, VFIO_EEH_PE_OP, &pe_op); 1534 if (ret < 0) { 1535 error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op); 1536 return -errno; 1537 } 1538 1539 return ret; 1540 } 1541 1542 static VFIOContainer *vfio_eeh_as_container(AddressSpace *as) 1543 { 1544 VFIOAddressSpace *space = vfio_get_address_space(as); 1545 VFIOContainer *container = NULL; 1546 1547 if (QLIST_EMPTY(&space->containers)) { 1548 /* No containers to act on */ 1549 goto out; 1550 } 1551 1552 container = QLIST_FIRST(&space->containers); 1553 1554 if (QLIST_NEXT(container, next)) { 1555 /* We don't yet have logic to synchronize EEH state across 1556 * multiple containers */ 1557 container = NULL; 1558 goto out; 1559 } 1560 1561 out: 1562 vfio_put_address_space(space); 1563 return container; 1564 } 1565 1566 bool vfio_eeh_as_ok(AddressSpace *as) 1567 { 1568 VFIOContainer *container = vfio_eeh_as_container(as); 1569 1570 return (container != NULL) && vfio_eeh_container_ok(container); 1571 } 1572 1573 int vfio_eeh_as_op(AddressSpace *as, uint32_t op) 1574 { 1575 VFIOContainer *container = vfio_eeh_as_container(as); 1576 1577 if (!container) { 1578 return -ENODEV; 1579 } 1580 return vfio_eeh_container_op(container, op); 1581 } 1582