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/balloon.h" 36 #include "sysemu/kvm.h" 37 #include "trace.h" 38 #include "qapi/error.h" 39 40 VFIOGroupList vfio_group_list = 41 QLIST_HEAD_INITIALIZER(vfio_group_list); 42 static QLIST_HEAD(, VFIOAddressSpace) vfio_address_spaces = 43 QLIST_HEAD_INITIALIZER(vfio_address_spaces); 44 45 #ifdef CONFIG_KVM 46 /* 47 * We have a single VFIO pseudo device per KVM VM. Once created it lives 48 * for the life of the VM. Closing the file descriptor only drops our 49 * reference to it and the device's reference to kvm. Therefore once 50 * initialized, this file descriptor is only released on QEMU exit and 51 * we'll re-use it should another vfio device be attached before then. 52 */ 53 static int vfio_kvm_device_fd = -1; 54 #endif 55 56 /* 57 * Common VFIO interrupt disable 58 */ 59 void vfio_disable_irqindex(VFIODevice *vbasedev, int index) 60 { 61 struct vfio_irq_set irq_set = { 62 .argsz = sizeof(irq_set), 63 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER, 64 .index = index, 65 .start = 0, 66 .count = 0, 67 }; 68 69 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 70 } 71 72 void vfio_unmask_single_irqindex(VFIODevice *vbasedev, int index) 73 { 74 struct vfio_irq_set irq_set = { 75 .argsz = sizeof(irq_set), 76 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK, 77 .index = index, 78 .start = 0, 79 .count = 1, 80 }; 81 82 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 83 } 84 85 void vfio_mask_single_irqindex(VFIODevice *vbasedev, int index) 86 { 87 struct vfio_irq_set irq_set = { 88 .argsz = sizeof(irq_set), 89 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK, 90 .index = index, 91 .start = 0, 92 .count = 1, 93 }; 94 95 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 96 } 97 98 static inline const char *action_to_str(int action) 99 { 100 switch (action) { 101 case VFIO_IRQ_SET_ACTION_MASK: 102 return "MASK"; 103 case VFIO_IRQ_SET_ACTION_UNMASK: 104 return "UNMASK"; 105 case VFIO_IRQ_SET_ACTION_TRIGGER: 106 return "TRIGGER"; 107 default: 108 return "UNKNOWN ACTION"; 109 } 110 } 111 112 static const char *index_to_str(VFIODevice *vbasedev, int index) 113 { 114 if (vbasedev->type != VFIO_DEVICE_TYPE_PCI) { 115 return NULL; 116 } 117 118 switch (index) { 119 case VFIO_PCI_INTX_IRQ_INDEX: 120 return "INTX"; 121 case VFIO_PCI_MSI_IRQ_INDEX: 122 return "MSI"; 123 case VFIO_PCI_MSIX_IRQ_INDEX: 124 return "MSIX"; 125 case VFIO_PCI_ERR_IRQ_INDEX: 126 return "ERR"; 127 case VFIO_PCI_REQ_IRQ_INDEX: 128 return "REQ"; 129 default: 130 return NULL; 131 } 132 } 133 134 int vfio_set_irq_signaling(VFIODevice *vbasedev, int index, int subindex, 135 int action, int fd, Error **errp) 136 { 137 struct vfio_irq_set *irq_set; 138 int argsz, ret = 0; 139 const char *name; 140 int32_t *pfd; 141 142 argsz = sizeof(*irq_set) + sizeof(*pfd); 143 144 irq_set = g_malloc0(argsz); 145 irq_set->argsz = argsz; 146 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | action; 147 irq_set->index = index; 148 irq_set->start = subindex; 149 irq_set->count = 1; 150 pfd = (int32_t *)&irq_set->data; 151 *pfd = fd; 152 153 if (ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, irq_set)) { 154 ret = -errno; 155 } 156 g_free(irq_set); 157 158 if (!ret) { 159 return 0; 160 } 161 162 error_setg_errno(errp, -ret, "VFIO_DEVICE_SET_IRQS failure"); 163 164 name = index_to_str(vbasedev, index); 165 if (name) { 166 error_prepend(errp, "%s-%d: ", name, subindex); 167 } else { 168 error_prepend(errp, "index %d-%d: ", index, subindex); 169 } 170 error_prepend(errp, 171 "Failed to %s %s eventfd signaling for interrupt ", 172 fd < 0 ? "tear down" : "set up", action_to_str(action)); 173 return ret; 174 } 175 176 /* 177 * IO Port/MMIO - Beware of the endians, VFIO is always little endian 178 */ 179 void vfio_region_write(void *opaque, hwaddr addr, 180 uint64_t data, unsigned size) 181 { 182 VFIORegion *region = opaque; 183 VFIODevice *vbasedev = region->vbasedev; 184 union { 185 uint8_t byte; 186 uint16_t word; 187 uint32_t dword; 188 uint64_t qword; 189 } buf; 190 191 switch (size) { 192 case 1: 193 buf.byte = data; 194 break; 195 case 2: 196 buf.word = cpu_to_le16(data); 197 break; 198 case 4: 199 buf.dword = cpu_to_le32(data); 200 break; 201 case 8: 202 buf.qword = cpu_to_le64(data); 203 break; 204 default: 205 hw_error("vfio: unsupported write size, %d bytes", size); 206 break; 207 } 208 209 if (pwrite(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) { 210 error_report("%s(%s:region%d+0x%"HWADDR_PRIx", 0x%"PRIx64 211 ",%d) failed: %m", 212 __func__, vbasedev->name, region->nr, 213 addr, data, size); 214 } 215 216 trace_vfio_region_write(vbasedev->name, region->nr, addr, data, size); 217 218 /* 219 * A read or write to a BAR always signals an INTx EOI. This will 220 * do nothing if not pending (including not in INTx mode). We assume 221 * that a BAR access is in response to an interrupt and that BAR 222 * accesses will service the interrupt. Unfortunately, we don't know 223 * which access will service the interrupt, so we're potentially 224 * getting quite a few host interrupts per guest interrupt. 225 */ 226 vbasedev->ops->vfio_eoi(vbasedev); 227 } 228 229 uint64_t vfio_region_read(void *opaque, 230 hwaddr addr, unsigned size) 231 { 232 VFIORegion *region = opaque; 233 VFIODevice *vbasedev = region->vbasedev; 234 union { 235 uint8_t byte; 236 uint16_t word; 237 uint32_t dword; 238 uint64_t qword; 239 } buf; 240 uint64_t data = 0; 241 242 if (pread(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) { 243 error_report("%s(%s:region%d+0x%"HWADDR_PRIx", %d) failed: %m", 244 __func__, vbasedev->name, region->nr, 245 addr, size); 246 return (uint64_t)-1; 247 } 248 switch (size) { 249 case 1: 250 data = buf.byte; 251 break; 252 case 2: 253 data = le16_to_cpu(buf.word); 254 break; 255 case 4: 256 data = le32_to_cpu(buf.dword); 257 break; 258 case 8: 259 data = le64_to_cpu(buf.qword); 260 break; 261 default: 262 hw_error("vfio: unsupported read size, %d bytes", size); 263 break; 264 } 265 266 trace_vfio_region_read(vbasedev->name, region->nr, addr, size, data); 267 268 /* Same as write above */ 269 vbasedev->ops->vfio_eoi(vbasedev); 270 271 return data; 272 } 273 274 const MemoryRegionOps vfio_region_ops = { 275 .read = vfio_region_read, 276 .write = vfio_region_write, 277 .endianness = DEVICE_LITTLE_ENDIAN, 278 .valid = { 279 .min_access_size = 1, 280 .max_access_size = 8, 281 }, 282 .impl = { 283 .min_access_size = 1, 284 .max_access_size = 8, 285 }, 286 }; 287 288 /* 289 * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86 290 */ 291 static int vfio_dma_unmap(VFIOContainer *container, 292 hwaddr iova, ram_addr_t size) 293 { 294 struct vfio_iommu_type1_dma_unmap unmap = { 295 .argsz = sizeof(unmap), 296 .flags = 0, 297 .iova = iova, 298 .size = size, 299 }; 300 301 while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) { 302 /* 303 * The type1 backend has an off-by-one bug in the kernel (71a7d3d78e3c 304 * v4.15) where an overflow in its wrap-around check prevents us from 305 * unmapping the last page of the address space. Test for the error 306 * condition and re-try the unmap excluding the last page. The 307 * expectation is that we've never mapped the last page anyway and this 308 * unmap request comes via vIOMMU support which also makes it unlikely 309 * that this page is used. This bug was introduced well after type1 v2 310 * support was introduced, so we shouldn't need to test for v1. A fix 311 * is queued for kernel v5.0 so this workaround can be removed once 312 * affected kernels are sufficiently deprecated. 313 */ 314 if (errno == EINVAL && unmap.size && !(unmap.iova + unmap.size) && 315 container->iommu_type == VFIO_TYPE1v2_IOMMU) { 316 trace_vfio_dma_unmap_overflow_workaround(); 317 unmap.size -= 1ULL << ctz64(container->pgsizes); 318 continue; 319 } 320 error_report("VFIO_UNMAP_DMA: %d", -errno); 321 return -errno; 322 } 323 324 return 0; 325 } 326 327 static int vfio_dma_map(VFIOContainer *container, hwaddr iova, 328 ram_addr_t size, void *vaddr, bool readonly) 329 { 330 struct vfio_iommu_type1_dma_map map = { 331 .argsz = sizeof(map), 332 .flags = VFIO_DMA_MAP_FLAG_READ, 333 .vaddr = (__u64)(uintptr_t)vaddr, 334 .iova = iova, 335 .size = size, 336 }; 337 338 if (!readonly) { 339 map.flags |= VFIO_DMA_MAP_FLAG_WRITE; 340 } 341 342 /* 343 * Try the mapping, if it fails with EBUSY, unmap the region and try 344 * again. This shouldn't be necessary, but we sometimes see it in 345 * the VGA ROM space. 346 */ 347 if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 || 348 (errno == EBUSY && vfio_dma_unmap(container, iova, size) == 0 && 349 ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) { 350 return 0; 351 } 352 353 error_report("VFIO_MAP_DMA: %d", -errno); 354 return -errno; 355 } 356 357 static void vfio_host_win_add(VFIOContainer *container, 358 hwaddr min_iova, hwaddr max_iova, 359 uint64_t iova_pgsizes) 360 { 361 VFIOHostDMAWindow *hostwin; 362 363 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 364 if (ranges_overlap(hostwin->min_iova, 365 hostwin->max_iova - hostwin->min_iova + 1, 366 min_iova, 367 max_iova - min_iova + 1)) { 368 hw_error("%s: Overlapped IOMMU are not enabled", __func__); 369 } 370 } 371 372 hostwin = g_malloc0(sizeof(*hostwin)); 373 374 hostwin->min_iova = min_iova; 375 hostwin->max_iova = max_iova; 376 hostwin->iova_pgsizes = iova_pgsizes; 377 QLIST_INSERT_HEAD(&container->hostwin_list, hostwin, hostwin_next); 378 } 379 380 static int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova, 381 hwaddr max_iova) 382 { 383 VFIOHostDMAWindow *hostwin; 384 385 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 386 if (hostwin->min_iova == min_iova && hostwin->max_iova == max_iova) { 387 QLIST_REMOVE(hostwin, hostwin_next); 388 return 0; 389 } 390 } 391 392 return -1; 393 } 394 395 static bool vfio_listener_skipped_section(MemoryRegionSection *section) 396 { 397 return (!memory_region_is_ram(section->mr) && 398 !memory_region_is_iommu(section->mr)) || 399 /* 400 * Sizing an enabled 64-bit BAR can cause spurious mappings to 401 * addresses in the upper part of the 64-bit address space. These 402 * are never accessed by the CPU and beyond the address width of 403 * some IOMMU hardware. TODO: VFIO should tell us the IOMMU width. 404 */ 405 section->offset_within_address_space & (1ULL << 63); 406 } 407 408 /* Called with rcu_read_lock held. */ 409 static bool vfio_get_vaddr(IOMMUTLBEntry *iotlb, void **vaddr, 410 bool *read_only) 411 { 412 MemoryRegion *mr; 413 hwaddr xlat; 414 hwaddr len = iotlb->addr_mask + 1; 415 bool writable = iotlb->perm & IOMMU_WO; 416 417 /* 418 * The IOMMU TLB entry we have just covers translation through 419 * this IOMMU to its immediate target. We need to translate 420 * it the rest of the way through to memory. 421 */ 422 mr = address_space_translate(&address_space_memory, 423 iotlb->translated_addr, 424 &xlat, &len, writable, 425 MEMTXATTRS_UNSPECIFIED); 426 if (!memory_region_is_ram(mr)) { 427 error_report("iommu map to non memory area %"HWADDR_PRIx"", 428 xlat); 429 return false; 430 } 431 432 /* 433 * Translation truncates length to the IOMMU page size, 434 * check that it did not truncate too much. 435 */ 436 if (len & iotlb->addr_mask) { 437 error_report("iommu has granularity incompatible with target AS"); 438 return false; 439 } 440 441 *vaddr = memory_region_get_ram_ptr(mr) + xlat; 442 *read_only = !writable || mr->readonly; 443 444 return true; 445 } 446 447 static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) 448 { 449 VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n); 450 VFIOContainer *container = giommu->container; 451 hwaddr iova = iotlb->iova + giommu->iommu_offset; 452 bool read_only; 453 void *vaddr; 454 int ret; 455 456 trace_vfio_iommu_map_notify(iotlb->perm == IOMMU_NONE ? "UNMAP" : "MAP", 457 iova, iova + iotlb->addr_mask); 458 459 if (iotlb->target_as != &address_space_memory) { 460 error_report("Wrong target AS \"%s\", only system memory is allowed", 461 iotlb->target_as->name ? iotlb->target_as->name : "none"); 462 return; 463 } 464 465 rcu_read_lock(); 466 467 if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) { 468 if (!vfio_get_vaddr(iotlb, &vaddr, &read_only)) { 469 goto out; 470 } 471 /* 472 * vaddr is only valid until rcu_read_unlock(). But after 473 * vfio_dma_map has set up the mapping the pages will be 474 * pinned by the kernel. This makes sure that the RAM backend 475 * of vaddr will always be there, even if the memory object is 476 * destroyed and its backing memory munmap-ed. 477 */ 478 ret = vfio_dma_map(container, iova, 479 iotlb->addr_mask + 1, vaddr, 480 read_only); 481 if (ret) { 482 error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", " 483 "0x%"HWADDR_PRIx", %p) = %d (%m)", 484 container, iova, 485 iotlb->addr_mask + 1, vaddr, ret); 486 } 487 } else { 488 ret = vfio_dma_unmap(container, iova, iotlb->addr_mask + 1); 489 if (ret) { 490 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " 491 "0x%"HWADDR_PRIx") = %d (%m)", 492 container, iova, 493 iotlb->addr_mask + 1, ret); 494 } 495 } 496 out: 497 rcu_read_unlock(); 498 } 499 500 static void vfio_listener_region_add(MemoryListener *listener, 501 MemoryRegionSection *section) 502 { 503 VFIOContainer *container = container_of(listener, VFIOContainer, listener); 504 hwaddr iova, end; 505 Int128 llend, llsize; 506 void *vaddr; 507 int ret; 508 VFIOHostDMAWindow *hostwin; 509 bool hostwin_found; 510 511 if (vfio_listener_skipped_section(section)) { 512 trace_vfio_listener_region_add_skip( 513 section->offset_within_address_space, 514 section->offset_within_address_space + 515 int128_get64(int128_sub(section->size, int128_one()))); 516 return; 517 } 518 519 if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) != 520 (section->offset_within_region & ~TARGET_PAGE_MASK))) { 521 error_report("%s received unaligned region", __func__); 522 return; 523 } 524 525 iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); 526 llend = int128_make64(section->offset_within_address_space); 527 llend = int128_add(llend, section->size); 528 llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); 529 530 if (int128_ge(int128_make64(iova), llend)) { 531 return; 532 } 533 end = int128_get64(int128_sub(llend, int128_one())); 534 535 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 536 hwaddr pgsize = 0; 537 538 /* For now intersections are not allowed, we may relax this later */ 539 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 540 if (ranges_overlap(hostwin->min_iova, 541 hostwin->max_iova - hostwin->min_iova + 1, 542 section->offset_within_address_space, 543 int128_get64(section->size))) { 544 ret = -1; 545 goto fail; 546 } 547 } 548 549 ret = vfio_spapr_create_window(container, section, &pgsize); 550 if (ret) { 551 goto fail; 552 } 553 554 vfio_host_win_add(container, section->offset_within_address_space, 555 section->offset_within_address_space + 556 int128_get64(section->size) - 1, pgsize); 557 #ifdef CONFIG_KVM 558 if (kvm_enabled()) { 559 VFIOGroup *group; 560 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr); 561 struct kvm_vfio_spapr_tce param; 562 struct kvm_device_attr attr = { 563 .group = KVM_DEV_VFIO_GROUP, 564 .attr = KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE, 565 .addr = (uint64_t)(unsigned long)¶m, 566 }; 567 568 if (!memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_SPAPR_TCE_FD, 569 ¶m.tablefd)) { 570 QLIST_FOREACH(group, &container->group_list, container_next) { 571 param.groupfd = group->fd; 572 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 573 error_report("vfio: failed to setup fd %d " 574 "for a group with fd %d: %s", 575 param.tablefd, param.groupfd, 576 strerror(errno)); 577 return; 578 } 579 trace_vfio_spapr_group_attach(param.groupfd, param.tablefd); 580 } 581 } 582 } 583 #endif 584 } 585 586 hostwin_found = false; 587 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 588 if (hostwin->min_iova <= iova && end <= hostwin->max_iova) { 589 hostwin_found = true; 590 break; 591 } 592 } 593 594 if (!hostwin_found) { 595 error_report("vfio: IOMMU container %p can't map guest IOVA region" 596 " 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx, 597 container, iova, end); 598 ret = -EFAULT; 599 goto fail; 600 } 601 602 memory_region_ref(section->mr); 603 604 if (memory_region_is_iommu(section->mr)) { 605 VFIOGuestIOMMU *giommu; 606 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr); 607 int iommu_idx; 608 609 trace_vfio_listener_region_add_iommu(iova, end); 610 /* 611 * FIXME: For VFIO iommu types which have KVM acceleration to 612 * avoid bouncing all map/unmaps through qemu this way, this 613 * would be the right place to wire that up (tell the KVM 614 * device emulation the VFIO iommu handles to use). 615 */ 616 giommu = g_malloc0(sizeof(*giommu)); 617 giommu->iommu = iommu_mr; 618 giommu->iommu_offset = section->offset_within_address_space - 619 section->offset_within_region; 620 giommu->container = container; 621 llend = int128_add(int128_make64(section->offset_within_region), 622 section->size); 623 llend = int128_sub(llend, int128_one()); 624 iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr, 625 MEMTXATTRS_UNSPECIFIED); 626 iommu_notifier_init(&giommu->n, vfio_iommu_map_notify, 627 IOMMU_NOTIFIER_ALL, 628 section->offset_within_region, 629 int128_get64(llend), 630 iommu_idx); 631 QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next); 632 633 memory_region_register_iommu_notifier(section->mr, &giommu->n); 634 memory_region_iommu_replay(giommu->iommu, &giommu->n); 635 636 return; 637 } 638 639 /* Here we assume that memory_region_is_ram(section->mr)==true */ 640 641 vaddr = memory_region_get_ram_ptr(section->mr) + 642 section->offset_within_region + 643 (iova - section->offset_within_address_space); 644 645 trace_vfio_listener_region_add_ram(iova, end, vaddr); 646 647 llsize = int128_sub(llend, int128_make64(iova)); 648 649 if (memory_region_is_ram_device(section->mr)) { 650 hwaddr pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; 651 652 if ((iova & pgmask) || (int128_get64(llsize) & pgmask)) { 653 trace_vfio_listener_region_add_no_dma_map( 654 memory_region_name(section->mr), 655 section->offset_within_address_space, 656 int128_getlo(section->size), 657 pgmask + 1); 658 return; 659 } 660 } 661 662 ret = vfio_dma_map(container, iova, int128_get64(llsize), 663 vaddr, section->readonly); 664 if (ret) { 665 error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", " 666 "0x%"HWADDR_PRIx", %p) = %d (%m)", 667 container, iova, int128_get64(llsize), vaddr, ret); 668 if (memory_region_is_ram_device(section->mr)) { 669 /* Allow unexpected mappings not to be fatal for RAM devices */ 670 return; 671 } 672 goto fail; 673 } 674 675 return; 676 677 fail: 678 if (memory_region_is_ram_device(section->mr)) { 679 error_report("failed to vfio_dma_map. pci p2p may not work"); 680 return; 681 } 682 /* 683 * On the initfn path, store the first error in the container so we 684 * can gracefully fail. Runtime, there's not much we can do other 685 * than throw a hardware error. 686 */ 687 if (!container->initialized) { 688 if (!container->error) { 689 container->error = ret; 690 } 691 } else { 692 hw_error("vfio: DMA mapping failed, unable to continue"); 693 } 694 } 695 696 static void vfio_listener_region_del(MemoryListener *listener, 697 MemoryRegionSection *section) 698 { 699 VFIOContainer *container = container_of(listener, VFIOContainer, listener); 700 hwaddr iova, end; 701 Int128 llend, llsize; 702 int ret; 703 bool try_unmap = true; 704 705 if (vfio_listener_skipped_section(section)) { 706 trace_vfio_listener_region_del_skip( 707 section->offset_within_address_space, 708 section->offset_within_address_space + 709 int128_get64(int128_sub(section->size, int128_one()))); 710 return; 711 } 712 713 if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) != 714 (section->offset_within_region & ~TARGET_PAGE_MASK))) { 715 error_report("%s received unaligned region", __func__); 716 return; 717 } 718 719 if (memory_region_is_iommu(section->mr)) { 720 VFIOGuestIOMMU *giommu; 721 722 QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) { 723 if (MEMORY_REGION(giommu->iommu) == section->mr && 724 giommu->n.start == section->offset_within_region) { 725 memory_region_unregister_iommu_notifier(section->mr, 726 &giommu->n); 727 QLIST_REMOVE(giommu, giommu_next); 728 g_free(giommu); 729 break; 730 } 731 } 732 733 /* 734 * FIXME: We assume the one big unmap below is adequate to 735 * remove any individual page mappings in the IOMMU which 736 * might have been copied into VFIO. This works for a page table 737 * based IOMMU where a big unmap flattens a large range of IO-PTEs. 738 * That may not be true for all IOMMU types. 739 */ 740 } 741 742 iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); 743 llend = int128_make64(section->offset_within_address_space); 744 llend = int128_add(llend, section->size); 745 llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); 746 747 if (int128_ge(int128_make64(iova), llend)) { 748 return; 749 } 750 end = int128_get64(int128_sub(llend, int128_one())); 751 752 llsize = int128_sub(llend, int128_make64(iova)); 753 754 trace_vfio_listener_region_del(iova, end); 755 756 if (memory_region_is_ram_device(section->mr)) { 757 hwaddr pgmask; 758 VFIOHostDMAWindow *hostwin; 759 bool hostwin_found = false; 760 761 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 762 if (hostwin->min_iova <= iova && end <= hostwin->max_iova) { 763 hostwin_found = true; 764 break; 765 } 766 } 767 assert(hostwin_found); /* or region_add() would have failed */ 768 769 pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; 770 try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask)); 771 } 772 773 if (try_unmap) { 774 ret = vfio_dma_unmap(container, iova, int128_get64(llsize)); 775 if (ret) { 776 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " 777 "0x%"HWADDR_PRIx") = %d (%m)", 778 container, iova, int128_get64(llsize), ret); 779 } 780 } 781 782 memory_region_unref(section->mr); 783 784 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 785 vfio_spapr_remove_window(container, 786 section->offset_within_address_space); 787 if (vfio_host_win_del(container, 788 section->offset_within_address_space, 789 section->offset_within_address_space + 790 int128_get64(section->size) - 1) < 0) { 791 hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx, 792 __func__, section->offset_within_address_space); 793 } 794 } 795 } 796 797 static const MemoryListener vfio_memory_listener = { 798 .region_add = vfio_listener_region_add, 799 .region_del = vfio_listener_region_del, 800 }; 801 802 static void vfio_listener_release(VFIOContainer *container) 803 { 804 memory_listener_unregister(&container->listener); 805 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 806 memory_listener_unregister(&container->prereg_listener); 807 } 808 } 809 810 struct vfio_info_cap_header * 811 vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id) 812 { 813 struct vfio_info_cap_header *hdr; 814 void *ptr = info; 815 816 if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) { 817 return NULL; 818 } 819 820 for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) { 821 if (hdr->id == id) { 822 return hdr; 823 } 824 } 825 826 return NULL; 827 } 828 829 static int vfio_setup_region_sparse_mmaps(VFIORegion *region, 830 struct vfio_region_info *info) 831 { 832 struct vfio_info_cap_header *hdr; 833 struct vfio_region_info_cap_sparse_mmap *sparse; 834 int i, j; 835 836 hdr = vfio_get_region_info_cap(info, VFIO_REGION_INFO_CAP_SPARSE_MMAP); 837 if (!hdr) { 838 return -ENODEV; 839 } 840 841 sparse = container_of(hdr, struct vfio_region_info_cap_sparse_mmap, header); 842 843 trace_vfio_region_sparse_mmap_header(region->vbasedev->name, 844 region->nr, sparse->nr_areas); 845 846 region->mmaps = g_new0(VFIOMmap, sparse->nr_areas); 847 848 for (i = 0, j = 0; i < sparse->nr_areas; i++) { 849 trace_vfio_region_sparse_mmap_entry(i, sparse->areas[i].offset, 850 sparse->areas[i].offset + 851 sparse->areas[i].size); 852 853 if (sparse->areas[i].size) { 854 region->mmaps[j].offset = sparse->areas[i].offset; 855 region->mmaps[j].size = sparse->areas[i].size; 856 j++; 857 } 858 } 859 860 region->nr_mmaps = j; 861 region->mmaps = g_realloc(region->mmaps, j * sizeof(VFIOMmap)); 862 863 return 0; 864 } 865 866 int vfio_region_setup(Object *obj, VFIODevice *vbasedev, VFIORegion *region, 867 int index, const char *name) 868 { 869 struct vfio_region_info *info; 870 int ret; 871 872 ret = vfio_get_region_info(vbasedev, index, &info); 873 if (ret) { 874 return ret; 875 } 876 877 region->vbasedev = vbasedev; 878 region->flags = info->flags; 879 region->size = info->size; 880 region->fd_offset = info->offset; 881 region->nr = index; 882 883 if (region->size) { 884 region->mem = g_new0(MemoryRegion, 1); 885 memory_region_init_io(region->mem, obj, &vfio_region_ops, 886 region, name, region->size); 887 888 if (!vbasedev->no_mmap && 889 region->flags & VFIO_REGION_INFO_FLAG_MMAP) { 890 891 ret = vfio_setup_region_sparse_mmaps(region, info); 892 893 if (ret) { 894 region->nr_mmaps = 1; 895 region->mmaps = g_new0(VFIOMmap, region->nr_mmaps); 896 region->mmaps[0].offset = 0; 897 region->mmaps[0].size = region->size; 898 } 899 } 900 } 901 902 g_free(info); 903 904 trace_vfio_region_setup(vbasedev->name, index, name, 905 region->flags, region->fd_offset, region->size); 906 return 0; 907 } 908 909 int vfio_region_mmap(VFIORegion *region) 910 { 911 int i, prot = 0; 912 char *name; 913 914 if (!region->mem) { 915 return 0; 916 } 917 918 prot |= region->flags & VFIO_REGION_INFO_FLAG_READ ? PROT_READ : 0; 919 prot |= region->flags & VFIO_REGION_INFO_FLAG_WRITE ? PROT_WRITE : 0; 920 921 for (i = 0; i < region->nr_mmaps; i++) { 922 region->mmaps[i].mmap = mmap(NULL, region->mmaps[i].size, prot, 923 MAP_SHARED, region->vbasedev->fd, 924 region->fd_offset + 925 region->mmaps[i].offset); 926 if (region->mmaps[i].mmap == MAP_FAILED) { 927 int ret = -errno; 928 929 trace_vfio_region_mmap_fault(memory_region_name(region->mem), i, 930 region->fd_offset + 931 region->mmaps[i].offset, 932 region->fd_offset + 933 region->mmaps[i].offset + 934 region->mmaps[i].size - 1, ret); 935 936 region->mmaps[i].mmap = NULL; 937 938 for (i--; i >= 0; i--) { 939 memory_region_del_subregion(region->mem, ®ion->mmaps[i].mem); 940 munmap(region->mmaps[i].mmap, region->mmaps[i].size); 941 object_unparent(OBJECT(®ion->mmaps[i].mem)); 942 region->mmaps[i].mmap = NULL; 943 } 944 945 return ret; 946 } 947 948 name = g_strdup_printf("%s mmaps[%d]", 949 memory_region_name(region->mem), i); 950 memory_region_init_ram_device_ptr(®ion->mmaps[i].mem, 951 memory_region_owner(region->mem), 952 name, region->mmaps[i].size, 953 region->mmaps[i].mmap); 954 g_free(name); 955 memory_region_add_subregion(region->mem, region->mmaps[i].offset, 956 ®ion->mmaps[i].mem); 957 958 trace_vfio_region_mmap(memory_region_name(®ion->mmaps[i].mem), 959 region->mmaps[i].offset, 960 region->mmaps[i].offset + 961 region->mmaps[i].size - 1); 962 } 963 964 return 0; 965 } 966 967 void vfio_region_exit(VFIORegion *region) 968 { 969 int i; 970 971 if (!region->mem) { 972 return; 973 } 974 975 for (i = 0; i < region->nr_mmaps; i++) { 976 if (region->mmaps[i].mmap) { 977 memory_region_del_subregion(region->mem, ®ion->mmaps[i].mem); 978 } 979 } 980 981 trace_vfio_region_exit(region->vbasedev->name, region->nr); 982 } 983 984 void vfio_region_finalize(VFIORegion *region) 985 { 986 int i; 987 988 if (!region->mem) { 989 return; 990 } 991 992 for (i = 0; i < region->nr_mmaps; i++) { 993 if (region->mmaps[i].mmap) { 994 munmap(region->mmaps[i].mmap, region->mmaps[i].size); 995 object_unparent(OBJECT(®ion->mmaps[i].mem)); 996 } 997 } 998 999 object_unparent(OBJECT(region->mem)); 1000 1001 g_free(region->mem); 1002 g_free(region->mmaps); 1003 1004 trace_vfio_region_finalize(region->vbasedev->name, region->nr); 1005 1006 region->mem = NULL; 1007 region->mmaps = NULL; 1008 region->nr_mmaps = 0; 1009 region->size = 0; 1010 region->flags = 0; 1011 region->nr = 0; 1012 } 1013 1014 void vfio_region_mmaps_set_enabled(VFIORegion *region, bool enabled) 1015 { 1016 int i; 1017 1018 if (!region->mem) { 1019 return; 1020 } 1021 1022 for (i = 0; i < region->nr_mmaps; i++) { 1023 if (region->mmaps[i].mmap) { 1024 memory_region_set_enabled(®ion->mmaps[i].mem, enabled); 1025 } 1026 } 1027 1028 trace_vfio_region_mmaps_set_enabled(memory_region_name(region->mem), 1029 enabled); 1030 } 1031 1032 void vfio_reset_handler(void *opaque) 1033 { 1034 VFIOGroup *group; 1035 VFIODevice *vbasedev; 1036 1037 QLIST_FOREACH(group, &vfio_group_list, next) { 1038 QLIST_FOREACH(vbasedev, &group->device_list, next) { 1039 if (vbasedev->dev->realized) { 1040 vbasedev->ops->vfio_compute_needs_reset(vbasedev); 1041 } 1042 } 1043 } 1044 1045 QLIST_FOREACH(group, &vfio_group_list, next) { 1046 QLIST_FOREACH(vbasedev, &group->device_list, next) { 1047 if (vbasedev->dev->realized && vbasedev->needs_reset) { 1048 vbasedev->ops->vfio_hot_reset_multi(vbasedev); 1049 } 1050 } 1051 } 1052 } 1053 1054 static void vfio_kvm_device_add_group(VFIOGroup *group) 1055 { 1056 #ifdef CONFIG_KVM 1057 struct kvm_device_attr attr = { 1058 .group = KVM_DEV_VFIO_GROUP, 1059 .attr = KVM_DEV_VFIO_GROUP_ADD, 1060 .addr = (uint64_t)(unsigned long)&group->fd, 1061 }; 1062 1063 if (!kvm_enabled()) { 1064 return; 1065 } 1066 1067 if (vfio_kvm_device_fd < 0) { 1068 struct kvm_create_device cd = { 1069 .type = KVM_DEV_TYPE_VFIO, 1070 }; 1071 1072 if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) { 1073 error_report("Failed to create KVM VFIO device: %m"); 1074 return; 1075 } 1076 1077 vfio_kvm_device_fd = cd.fd; 1078 } 1079 1080 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 1081 error_report("Failed to add group %d to KVM VFIO device: %m", 1082 group->groupid); 1083 } 1084 #endif 1085 } 1086 1087 static void vfio_kvm_device_del_group(VFIOGroup *group) 1088 { 1089 #ifdef CONFIG_KVM 1090 struct kvm_device_attr attr = { 1091 .group = KVM_DEV_VFIO_GROUP, 1092 .attr = KVM_DEV_VFIO_GROUP_DEL, 1093 .addr = (uint64_t)(unsigned long)&group->fd, 1094 }; 1095 1096 if (vfio_kvm_device_fd < 0) { 1097 return; 1098 } 1099 1100 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 1101 error_report("Failed to remove group %d from KVM VFIO device: %m", 1102 group->groupid); 1103 } 1104 #endif 1105 } 1106 1107 static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as) 1108 { 1109 VFIOAddressSpace *space; 1110 1111 QLIST_FOREACH(space, &vfio_address_spaces, list) { 1112 if (space->as == as) { 1113 return space; 1114 } 1115 } 1116 1117 /* No suitable VFIOAddressSpace, create a new one */ 1118 space = g_malloc0(sizeof(*space)); 1119 space->as = as; 1120 QLIST_INIT(&space->containers); 1121 1122 QLIST_INSERT_HEAD(&vfio_address_spaces, space, list); 1123 1124 return space; 1125 } 1126 1127 static void vfio_put_address_space(VFIOAddressSpace *space) 1128 { 1129 if (QLIST_EMPTY(&space->containers)) { 1130 QLIST_REMOVE(space, list); 1131 g_free(space); 1132 } 1133 } 1134 1135 /* 1136 * vfio_get_iommu_type - selects the richest iommu_type (v2 first) 1137 */ 1138 static int vfio_get_iommu_type(VFIOContainer *container, 1139 Error **errp) 1140 { 1141 int iommu_types[] = { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU, 1142 VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU }; 1143 int i; 1144 1145 for (i = 0; i < ARRAY_SIZE(iommu_types); i++) { 1146 if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) { 1147 return iommu_types[i]; 1148 } 1149 } 1150 error_setg(errp, "No available IOMMU models"); 1151 return -EINVAL; 1152 } 1153 1154 static int vfio_init_container(VFIOContainer *container, int group_fd, 1155 Error **errp) 1156 { 1157 int iommu_type, ret; 1158 1159 iommu_type = vfio_get_iommu_type(container, errp); 1160 if (iommu_type < 0) { 1161 return iommu_type; 1162 } 1163 1164 ret = ioctl(group_fd, VFIO_GROUP_SET_CONTAINER, &container->fd); 1165 if (ret) { 1166 error_setg_errno(errp, errno, "Failed to set group container"); 1167 return -errno; 1168 } 1169 1170 while (ioctl(container->fd, VFIO_SET_IOMMU, iommu_type)) { 1171 if (iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 1172 /* 1173 * On sPAPR, despite the IOMMU subdriver always advertises v1 and 1174 * v2, the running platform may not support v2 and there is no 1175 * way to guess it until an IOMMU group gets added to the container. 1176 * So in case it fails with v2, try v1 as a fallback. 1177 */ 1178 iommu_type = VFIO_SPAPR_TCE_IOMMU; 1179 continue; 1180 } 1181 error_setg_errno(errp, errno, "Failed to set iommu for container"); 1182 return -errno; 1183 } 1184 1185 container->iommu_type = iommu_type; 1186 return 0; 1187 } 1188 1189 static int vfio_connect_container(VFIOGroup *group, AddressSpace *as, 1190 Error **errp) 1191 { 1192 VFIOContainer *container; 1193 int ret, fd; 1194 VFIOAddressSpace *space; 1195 1196 space = vfio_get_address_space(as); 1197 1198 /* 1199 * VFIO is currently incompatible with memory ballooning insofar as the 1200 * madvise to purge (zap) the page from QEMU's address space does not 1201 * interact with the memory API and therefore leaves stale virtual to 1202 * physical mappings in the IOMMU if the page was previously pinned. We 1203 * therefore add a balloon inhibit for each group added to a container, 1204 * whether the container is used individually or shared. This provides 1205 * us with options to allow devices within a group to opt-in and allow 1206 * ballooning, so long as it is done consistently for a group (for instance 1207 * if the device is an mdev device where it is known that the host vendor 1208 * driver will never pin pages outside of the working set of the guest 1209 * driver, which would thus not be ballooning candidates). 1210 * 1211 * The first opportunity to induce pinning occurs here where we attempt to 1212 * attach the group to existing containers within the AddressSpace. If any 1213 * pages are already zapped from the virtual address space, such as from a 1214 * previous ballooning opt-in, new pinning will cause valid mappings to be 1215 * re-established. Likewise, when the overall MemoryListener for a new 1216 * container is registered, a replay of mappings within the AddressSpace 1217 * will occur, re-establishing any previously zapped pages as well. 1218 * 1219 * NB. Balloon inhibiting does not currently block operation of the 1220 * balloon driver or revoke previously pinned pages, it only prevents 1221 * calling madvise to modify the virtual mapping of ballooned pages. 1222 */ 1223 qemu_balloon_inhibit(true); 1224 1225 QLIST_FOREACH(container, &space->containers, next) { 1226 if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) { 1227 group->container = container; 1228 QLIST_INSERT_HEAD(&container->group_list, group, container_next); 1229 vfio_kvm_device_add_group(group); 1230 return 0; 1231 } 1232 } 1233 1234 fd = qemu_open("/dev/vfio/vfio", O_RDWR); 1235 if (fd < 0) { 1236 error_setg_errno(errp, errno, "failed to open /dev/vfio/vfio"); 1237 ret = -errno; 1238 goto put_space_exit; 1239 } 1240 1241 ret = ioctl(fd, VFIO_GET_API_VERSION); 1242 if (ret != VFIO_API_VERSION) { 1243 error_setg(errp, "supported vfio version: %d, " 1244 "reported version: %d", VFIO_API_VERSION, ret); 1245 ret = -EINVAL; 1246 goto close_fd_exit; 1247 } 1248 1249 container = g_malloc0(sizeof(*container)); 1250 container->space = space; 1251 container->fd = fd; 1252 QLIST_INIT(&container->giommu_list); 1253 QLIST_INIT(&container->hostwin_list); 1254 1255 ret = vfio_init_container(container, group->fd, errp); 1256 if (ret) { 1257 goto free_container_exit; 1258 } 1259 1260 switch (container->iommu_type) { 1261 case VFIO_TYPE1v2_IOMMU: 1262 case VFIO_TYPE1_IOMMU: 1263 { 1264 struct vfio_iommu_type1_info info; 1265 1266 /* 1267 * FIXME: This assumes that a Type1 IOMMU can map any 64-bit 1268 * IOVA whatsoever. That's not actually true, but the current 1269 * kernel interface doesn't tell us what it can map, and the 1270 * existing Type1 IOMMUs generally support any IOVA we're 1271 * going to actually try in practice. 1272 */ 1273 info.argsz = sizeof(info); 1274 ret = ioctl(fd, VFIO_IOMMU_GET_INFO, &info); 1275 /* Ignore errors */ 1276 if (ret || !(info.flags & VFIO_IOMMU_INFO_PGSIZES)) { 1277 /* Assume 4k IOVA page size */ 1278 info.iova_pgsizes = 4096; 1279 } 1280 vfio_host_win_add(container, 0, (hwaddr)-1, info.iova_pgsizes); 1281 container->pgsizes = info.iova_pgsizes; 1282 break; 1283 } 1284 case VFIO_SPAPR_TCE_v2_IOMMU: 1285 case VFIO_SPAPR_TCE_IOMMU: 1286 { 1287 struct vfio_iommu_spapr_tce_info info; 1288 bool v2 = container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU; 1289 1290 /* 1291 * The host kernel code implementing VFIO_IOMMU_DISABLE is called 1292 * when container fd is closed so we do not call it explicitly 1293 * in this file. 1294 */ 1295 if (!v2) { 1296 ret = ioctl(fd, VFIO_IOMMU_ENABLE); 1297 if (ret) { 1298 error_setg_errno(errp, errno, "failed to enable container"); 1299 ret = -errno; 1300 goto free_container_exit; 1301 } 1302 } else { 1303 container->prereg_listener = vfio_prereg_listener; 1304 1305 memory_listener_register(&container->prereg_listener, 1306 &address_space_memory); 1307 if (container->error) { 1308 memory_listener_unregister(&container->prereg_listener); 1309 ret = container->error; 1310 error_setg(errp, 1311 "RAM memory listener initialization failed for container"); 1312 goto free_container_exit; 1313 } 1314 } 1315 1316 info.argsz = sizeof(info); 1317 ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info); 1318 if (ret) { 1319 error_setg_errno(errp, errno, 1320 "VFIO_IOMMU_SPAPR_TCE_GET_INFO failed"); 1321 ret = -errno; 1322 if (v2) { 1323 memory_listener_unregister(&container->prereg_listener); 1324 } 1325 goto free_container_exit; 1326 } 1327 1328 if (v2) { 1329 container->pgsizes = info.ddw.pgsizes; 1330 /* 1331 * There is a default window in just created container. 1332 * To make region_add/del simpler, we better remove this 1333 * window now and let those iommu_listener callbacks 1334 * create/remove them when needed. 1335 */ 1336 ret = vfio_spapr_remove_window(container, info.dma32_window_start); 1337 if (ret) { 1338 error_setg_errno(errp, -ret, 1339 "failed to remove existing window"); 1340 goto free_container_exit; 1341 } 1342 } else { 1343 /* The default table uses 4K pages */ 1344 container->pgsizes = 0x1000; 1345 vfio_host_win_add(container, info.dma32_window_start, 1346 info.dma32_window_start + 1347 info.dma32_window_size - 1, 1348 0x1000); 1349 } 1350 } 1351 } 1352 1353 vfio_kvm_device_add_group(group); 1354 1355 QLIST_INIT(&container->group_list); 1356 QLIST_INSERT_HEAD(&space->containers, container, next); 1357 1358 group->container = container; 1359 QLIST_INSERT_HEAD(&container->group_list, group, container_next); 1360 1361 container->listener = vfio_memory_listener; 1362 1363 memory_listener_register(&container->listener, container->space->as); 1364 1365 if (container->error) { 1366 ret = container->error; 1367 error_setg_errno(errp, -ret, 1368 "memory listener initialization failed for container"); 1369 goto listener_release_exit; 1370 } 1371 1372 container->initialized = true; 1373 1374 return 0; 1375 listener_release_exit: 1376 QLIST_REMOVE(group, container_next); 1377 QLIST_REMOVE(container, next); 1378 vfio_kvm_device_del_group(group); 1379 vfio_listener_release(container); 1380 1381 free_container_exit: 1382 g_free(container); 1383 1384 close_fd_exit: 1385 close(fd); 1386 1387 put_space_exit: 1388 qemu_balloon_inhibit(false); 1389 vfio_put_address_space(space); 1390 1391 return ret; 1392 } 1393 1394 static void vfio_disconnect_container(VFIOGroup *group) 1395 { 1396 VFIOContainer *container = group->container; 1397 1398 QLIST_REMOVE(group, container_next); 1399 group->container = NULL; 1400 1401 /* 1402 * Explicitly release the listener first before unset container, 1403 * since unset may destroy the backend container if it's the last 1404 * group. 1405 */ 1406 if (QLIST_EMPTY(&container->group_list)) { 1407 vfio_listener_release(container); 1408 } 1409 1410 if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) { 1411 error_report("vfio: error disconnecting group %d from container", 1412 group->groupid); 1413 } 1414 1415 if (QLIST_EMPTY(&container->group_list)) { 1416 VFIOAddressSpace *space = container->space; 1417 VFIOGuestIOMMU *giommu, *tmp; 1418 1419 QLIST_REMOVE(container, next); 1420 1421 QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) { 1422 memory_region_unregister_iommu_notifier( 1423 MEMORY_REGION(giommu->iommu), &giommu->n); 1424 QLIST_REMOVE(giommu, giommu_next); 1425 g_free(giommu); 1426 } 1427 1428 trace_vfio_disconnect_container(container->fd); 1429 close(container->fd); 1430 g_free(container); 1431 1432 vfio_put_address_space(space); 1433 } 1434 } 1435 1436 VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp) 1437 { 1438 VFIOGroup *group; 1439 char path[32]; 1440 struct vfio_group_status status = { .argsz = sizeof(status) }; 1441 1442 QLIST_FOREACH(group, &vfio_group_list, next) { 1443 if (group->groupid == groupid) { 1444 /* Found it. Now is it already in the right context? */ 1445 if (group->container->space->as == as) { 1446 return group; 1447 } else { 1448 error_setg(errp, "group %d used in multiple address spaces", 1449 group->groupid); 1450 return NULL; 1451 } 1452 } 1453 } 1454 1455 group = g_malloc0(sizeof(*group)); 1456 1457 snprintf(path, sizeof(path), "/dev/vfio/%d", groupid); 1458 group->fd = qemu_open(path, O_RDWR); 1459 if (group->fd < 0) { 1460 error_setg_errno(errp, errno, "failed to open %s", path); 1461 goto free_group_exit; 1462 } 1463 1464 if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) { 1465 error_setg_errno(errp, errno, "failed to get group %d status", groupid); 1466 goto close_fd_exit; 1467 } 1468 1469 if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) { 1470 error_setg(errp, "group %d is not viable", groupid); 1471 error_append_hint(errp, 1472 "Please ensure all devices within the iommu_group " 1473 "are bound to their vfio bus driver.\n"); 1474 goto close_fd_exit; 1475 } 1476 1477 group->groupid = groupid; 1478 QLIST_INIT(&group->device_list); 1479 1480 if (vfio_connect_container(group, as, errp)) { 1481 error_prepend(errp, "failed to setup container for group %d: ", 1482 groupid); 1483 goto close_fd_exit; 1484 } 1485 1486 if (QLIST_EMPTY(&vfio_group_list)) { 1487 qemu_register_reset(vfio_reset_handler, NULL); 1488 } 1489 1490 QLIST_INSERT_HEAD(&vfio_group_list, group, next); 1491 1492 return group; 1493 1494 close_fd_exit: 1495 close(group->fd); 1496 1497 free_group_exit: 1498 g_free(group); 1499 1500 return NULL; 1501 } 1502 1503 void vfio_put_group(VFIOGroup *group) 1504 { 1505 if (!group || !QLIST_EMPTY(&group->device_list)) { 1506 return; 1507 } 1508 1509 if (!group->balloon_allowed) { 1510 qemu_balloon_inhibit(false); 1511 } 1512 vfio_kvm_device_del_group(group); 1513 vfio_disconnect_container(group); 1514 QLIST_REMOVE(group, next); 1515 trace_vfio_put_group(group->fd); 1516 close(group->fd); 1517 g_free(group); 1518 1519 if (QLIST_EMPTY(&vfio_group_list)) { 1520 qemu_unregister_reset(vfio_reset_handler, NULL); 1521 } 1522 } 1523 1524 int vfio_get_device(VFIOGroup *group, const char *name, 1525 VFIODevice *vbasedev, Error **errp) 1526 { 1527 struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) }; 1528 int ret, fd; 1529 1530 fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name); 1531 if (fd < 0) { 1532 error_setg_errno(errp, errno, "error getting device from group %d", 1533 group->groupid); 1534 error_append_hint(errp, 1535 "Verify all devices in group %d are bound to vfio-<bus> " 1536 "or pci-stub and not already in use\n", group->groupid); 1537 return fd; 1538 } 1539 1540 ret = ioctl(fd, VFIO_DEVICE_GET_INFO, &dev_info); 1541 if (ret) { 1542 error_setg_errno(errp, errno, "error getting device info"); 1543 close(fd); 1544 return ret; 1545 } 1546 1547 /* 1548 * Clear the balloon inhibitor for this group if the driver knows the 1549 * device operates compatibly with ballooning. Setting must be consistent 1550 * per group, but since compatibility is really only possible with mdev 1551 * currently, we expect singleton groups. 1552 */ 1553 if (vbasedev->balloon_allowed != group->balloon_allowed) { 1554 if (!QLIST_EMPTY(&group->device_list)) { 1555 error_setg(errp, 1556 "Inconsistent device balloon setting within group"); 1557 close(fd); 1558 return -1; 1559 } 1560 1561 if (!group->balloon_allowed) { 1562 group->balloon_allowed = true; 1563 qemu_balloon_inhibit(false); 1564 } 1565 } 1566 1567 vbasedev->fd = fd; 1568 vbasedev->group = group; 1569 QLIST_INSERT_HEAD(&group->device_list, vbasedev, next); 1570 1571 vbasedev->num_irqs = dev_info.num_irqs; 1572 vbasedev->num_regions = dev_info.num_regions; 1573 vbasedev->flags = dev_info.flags; 1574 1575 trace_vfio_get_device(name, dev_info.flags, dev_info.num_regions, 1576 dev_info.num_irqs); 1577 1578 vbasedev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET); 1579 return 0; 1580 } 1581 1582 void vfio_put_base_device(VFIODevice *vbasedev) 1583 { 1584 if (!vbasedev->group) { 1585 return; 1586 } 1587 QLIST_REMOVE(vbasedev, next); 1588 vbasedev->group = NULL; 1589 trace_vfio_put_base_device(vbasedev->fd); 1590 close(vbasedev->fd); 1591 } 1592 1593 int vfio_get_region_info(VFIODevice *vbasedev, int index, 1594 struct vfio_region_info **info) 1595 { 1596 size_t argsz = sizeof(struct vfio_region_info); 1597 1598 *info = g_malloc0(argsz); 1599 1600 (*info)->index = index; 1601 retry: 1602 (*info)->argsz = argsz; 1603 1604 if (ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, *info)) { 1605 g_free(*info); 1606 *info = NULL; 1607 return -errno; 1608 } 1609 1610 if ((*info)->argsz > argsz) { 1611 argsz = (*info)->argsz; 1612 *info = g_realloc(*info, argsz); 1613 1614 goto retry; 1615 } 1616 1617 return 0; 1618 } 1619 1620 int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t type, 1621 uint32_t subtype, struct vfio_region_info **info) 1622 { 1623 int i; 1624 1625 for (i = 0; i < vbasedev->num_regions; i++) { 1626 struct vfio_info_cap_header *hdr; 1627 struct vfio_region_info_cap_type *cap_type; 1628 1629 if (vfio_get_region_info(vbasedev, i, info)) { 1630 continue; 1631 } 1632 1633 hdr = vfio_get_region_info_cap(*info, VFIO_REGION_INFO_CAP_TYPE); 1634 if (!hdr) { 1635 g_free(*info); 1636 continue; 1637 } 1638 1639 cap_type = container_of(hdr, struct vfio_region_info_cap_type, header); 1640 1641 trace_vfio_get_dev_region(vbasedev->name, i, 1642 cap_type->type, cap_type->subtype); 1643 1644 if (cap_type->type == type && cap_type->subtype == subtype) { 1645 return 0; 1646 } 1647 1648 g_free(*info); 1649 } 1650 1651 *info = NULL; 1652 return -ENODEV; 1653 } 1654 1655 bool vfio_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_type) 1656 { 1657 struct vfio_region_info *info = NULL; 1658 bool ret = false; 1659 1660 if (!vfio_get_region_info(vbasedev, region, &info)) { 1661 if (vfio_get_region_info_cap(info, cap_type)) { 1662 ret = true; 1663 } 1664 g_free(info); 1665 } 1666 1667 return ret; 1668 } 1669 1670 /* 1671 * Interfaces for IBM EEH (Enhanced Error Handling) 1672 */ 1673 static bool vfio_eeh_container_ok(VFIOContainer *container) 1674 { 1675 /* 1676 * As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO 1677 * implementation is broken if there are multiple groups in a 1678 * container. The hardware works in units of Partitionable 1679 * Endpoints (== IOMMU groups) and the EEH operations naively 1680 * iterate across all groups in the container, without any logic 1681 * to make sure the groups have their state synchronized. For 1682 * certain operations (ENABLE) that might be ok, until an error 1683 * occurs, but for others (GET_STATE) it's clearly broken. 1684 */ 1685 1686 /* 1687 * XXX Once fixed kernels exist, test for them here 1688 */ 1689 1690 if (QLIST_EMPTY(&container->group_list)) { 1691 return false; 1692 } 1693 1694 if (QLIST_NEXT(QLIST_FIRST(&container->group_list), container_next)) { 1695 return false; 1696 } 1697 1698 return true; 1699 } 1700 1701 static int vfio_eeh_container_op(VFIOContainer *container, uint32_t op) 1702 { 1703 struct vfio_eeh_pe_op pe_op = { 1704 .argsz = sizeof(pe_op), 1705 .op = op, 1706 }; 1707 int ret; 1708 1709 if (!vfio_eeh_container_ok(container)) { 1710 error_report("vfio/eeh: EEH_PE_OP 0x%x: " 1711 "kernel requires a container with exactly one group", op); 1712 return -EPERM; 1713 } 1714 1715 ret = ioctl(container->fd, VFIO_EEH_PE_OP, &pe_op); 1716 if (ret < 0) { 1717 error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op); 1718 return -errno; 1719 } 1720 1721 return ret; 1722 } 1723 1724 static VFIOContainer *vfio_eeh_as_container(AddressSpace *as) 1725 { 1726 VFIOAddressSpace *space = vfio_get_address_space(as); 1727 VFIOContainer *container = NULL; 1728 1729 if (QLIST_EMPTY(&space->containers)) { 1730 /* No containers to act on */ 1731 goto out; 1732 } 1733 1734 container = QLIST_FIRST(&space->containers); 1735 1736 if (QLIST_NEXT(container, next)) { 1737 /* We don't yet have logic to synchronize EEH state across 1738 * multiple containers */ 1739 container = NULL; 1740 goto out; 1741 } 1742 1743 out: 1744 vfio_put_address_space(space); 1745 return container; 1746 } 1747 1748 bool vfio_eeh_as_ok(AddressSpace *as) 1749 { 1750 VFIOContainer *container = vfio_eeh_as_container(as); 1751 1752 return (container != NULL) && vfio_eeh_container_ok(container); 1753 } 1754 1755 int vfio_eeh_as_op(AddressSpace *as, uint32_t op) 1756 { 1757 VFIOContainer *container = vfio_eeh_as_container(as); 1758 1759 if (!container) { 1760 return -ENODEV; 1761 } 1762 return vfio_eeh_container_op(container, op); 1763 } 1764