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/main-loop.h" 35 #include "qemu/range.h" 36 #include "sysemu/balloon.h" 37 #include "sysemu/kvm.h" 38 #include "sysemu/reset.h" 39 #include "trace.h" 40 #include "qapi/error.h" 41 42 VFIOGroupList vfio_group_list = 43 QLIST_HEAD_INITIALIZER(vfio_group_list); 44 static QLIST_HEAD(, VFIOAddressSpace) vfio_address_spaces = 45 QLIST_HEAD_INITIALIZER(vfio_address_spaces); 46 47 #ifdef CONFIG_KVM 48 /* 49 * We have a single VFIO pseudo device per KVM VM. Once created it lives 50 * for the life of the VM. Closing the file descriptor only drops our 51 * reference to it and the device's reference to kvm. Therefore once 52 * initialized, this file descriptor is only released on QEMU exit and 53 * we'll re-use it should another vfio device be attached before then. 54 */ 55 static int vfio_kvm_device_fd = -1; 56 #endif 57 58 /* 59 * Common VFIO interrupt disable 60 */ 61 void vfio_disable_irqindex(VFIODevice *vbasedev, int index) 62 { 63 struct vfio_irq_set irq_set = { 64 .argsz = sizeof(irq_set), 65 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER, 66 .index = index, 67 .start = 0, 68 .count = 0, 69 }; 70 71 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 72 } 73 74 void vfio_unmask_single_irqindex(VFIODevice *vbasedev, int index) 75 { 76 struct vfio_irq_set irq_set = { 77 .argsz = sizeof(irq_set), 78 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK, 79 .index = index, 80 .start = 0, 81 .count = 1, 82 }; 83 84 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 85 } 86 87 void vfio_mask_single_irqindex(VFIODevice *vbasedev, int index) 88 { 89 struct vfio_irq_set irq_set = { 90 .argsz = sizeof(irq_set), 91 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK, 92 .index = index, 93 .start = 0, 94 .count = 1, 95 }; 96 97 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 98 } 99 100 static inline const char *action_to_str(int action) 101 { 102 switch (action) { 103 case VFIO_IRQ_SET_ACTION_MASK: 104 return "MASK"; 105 case VFIO_IRQ_SET_ACTION_UNMASK: 106 return "UNMASK"; 107 case VFIO_IRQ_SET_ACTION_TRIGGER: 108 return "TRIGGER"; 109 default: 110 return "UNKNOWN ACTION"; 111 } 112 } 113 114 static const char *index_to_str(VFIODevice *vbasedev, int index) 115 { 116 if (vbasedev->type != VFIO_DEVICE_TYPE_PCI) { 117 return NULL; 118 } 119 120 switch (index) { 121 case VFIO_PCI_INTX_IRQ_INDEX: 122 return "INTX"; 123 case VFIO_PCI_MSI_IRQ_INDEX: 124 return "MSI"; 125 case VFIO_PCI_MSIX_IRQ_INDEX: 126 return "MSIX"; 127 case VFIO_PCI_ERR_IRQ_INDEX: 128 return "ERR"; 129 case VFIO_PCI_REQ_IRQ_INDEX: 130 return "REQ"; 131 default: 132 return NULL; 133 } 134 } 135 136 int vfio_set_irq_signaling(VFIODevice *vbasedev, int index, int subindex, 137 int action, int fd, Error **errp) 138 { 139 struct vfio_irq_set *irq_set; 140 int argsz, ret = 0; 141 const char *name; 142 int32_t *pfd; 143 144 argsz = sizeof(*irq_set) + sizeof(*pfd); 145 146 irq_set = g_malloc0(argsz); 147 irq_set->argsz = argsz; 148 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | action; 149 irq_set->index = index; 150 irq_set->start = subindex; 151 irq_set->count = 1; 152 pfd = (int32_t *)&irq_set->data; 153 *pfd = fd; 154 155 if (ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, irq_set)) { 156 ret = -errno; 157 } 158 g_free(irq_set); 159 160 if (!ret) { 161 return 0; 162 } 163 164 error_setg_errno(errp, -ret, "VFIO_DEVICE_SET_IRQS failure"); 165 166 name = index_to_str(vbasedev, index); 167 if (name) { 168 error_prepend(errp, "%s-%d: ", name, subindex); 169 } else { 170 error_prepend(errp, "index %d-%d: ", index, subindex); 171 } 172 error_prepend(errp, 173 "Failed to %s %s eventfd signaling for interrupt ", 174 fd < 0 ? "tear down" : "set up", action_to_str(action)); 175 return ret; 176 } 177 178 /* 179 * IO Port/MMIO - Beware of the endians, VFIO is always little endian 180 */ 181 void vfio_region_write(void *opaque, hwaddr addr, 182 uint64_t data, unsigned size) 183 { 184 VFIORegion *region = opaque; 185 VFIODevice *vbasedev = region->vbasedev; 186 union { 187 uint8_t byte; 188 uint16_t word; 189 uint32_t dword; 190 uint64_t qword; 191 } buf; 192 193 switch (size) { 194 case 1: 195 buf.byte = data; 196 break; 197 case 2: 198 buf.word = cpu_to_le16(data); 199 break; 200 case 4: 201 buf.dword = cpu_to_le32(data); 202 break; 203 case 8: 204 buf.qword = cpu_to_le64(data); 205 break; 206 default: 207 hw_error("vfio: unsupported write size, %d bytes", size); 208 break; 209 } 210 211 if (pwrite(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) { 212 error_report("%s(%s:region%d+0x%"HWADDR_PRIx", 0x%"PRIx64 213 ",%d) failed: %m", 214 __func__, vbasedev->name, region->nr, 215 addr, data, size); 216 } 217 218 trace_vfio_region_write(vbasedev->name, region->nr, addr, data, size); 219 220 /* 221 * A read or write to a BAR always signals an INTx EOI. This will 222 * do nothing if not pending (including not in INTx mode). We assume 223 * that a BAR access is in response to an interrupt and that BAR 224 * accesses will service the interrupt. Unfortunately, we don't know 225 * which access will service the interrupt, so we're potentially 226 * getting quite a few host interrupts per guest interrupt. 227 */ 228 vbasedev->ops->vfio_eoi(vbasedev); 229 } 230 231 uint64_t vfio_region_read(void *opaque, 232 hwaddr addr, unsigned size) 233 { 234 VFIORegion *region = opaque; 235 VFIODevice *vbasedev = region->vbasedev; 236 union { 237 uint8_t byte; 238 uint16_t word; 239 uint32_t dword; 240 uint64_t qword; 241 } buf; 242 uint64_t data = 0; 243 244 if (pread(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) { 245 error_report("%s(%s:region%d+0x%"HWADDR_PRIx", %d) failed: %m", 246 __func__, vbasedev->name, region->nr, 247 addr, size); 248 return (uint64_t)-1; 249 } 250 switch (size) { 251 case 1: 252 data = buf.byte; 253 break; 254 case 2: 255 data = le16_to_cpu(buf.word); 256 break; 257 case 4: 258 data = le32_to_cpu(buf.dword); 259 break; 260 case 8: 261 data = le64_to_cpu(buf.qword); 262 break; 263 default: 264 hw_error("vfio: unsupported read size, %d bytes", size); 265 break; 266 } 267 268 trace_vfio_region_read(vbasedev->name, region->nr, addr, size, data); 269 270 /* Same as write above */ 271 vbasedev->ops->vfio_eoi(vbasedev); 272 273 return data; 274 } 275 276 const MemoryRegionOps vfio_region_ops = { 277 .read = vfio_region_read, 278 .write = vfio_region_write, 279 .endianness = DEVICE_LITTLE_ENDIAN, 280 .valid = { 281 .min_access_size = 1, 282 .max_access_size = 8, 283 }, 284 .impl = { 285 .min_access_size = 1, 286 .max_access_size = 8, 287 }, 288 }; 289 290 /* 291 * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86 292 */ 293 static int vfio_dma_unmap(VFIOContainer *container, 294 hwaddr iova, ram_addr_t size) 295 { 296 struct vfio_iommu_type1_dma_unmap unmap = { 297 .argsz = sizeof(unmap), 298 .flags = 0, 299 .iova = iova, 300 .size = size, 301 }; 302 303 while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) { 304 /* 305 * The type1 backend has an off-by-one bug in the kernel (71a7d3d78e3c 306 * v4.15) where an overflow in its wrap-around check prevents us from 307 * unmapping the last page of the address space. Test for the error 308 * condition and re-try the unmap excluding the last page. The 309 * expectation is that we've never mapped the last page anyway and this 310 * unmap request comes via vIOMMU support which also makes it unlikely 311 * that this page is used. This bug was introduced well after type1 v2 312 * support was introduced, so we shouldn't need to test for v1. A fix 313 * is queued for kernel v5.0 so this workaround can be removed once 314 * affected kernels are sufficiently deprecated. 315 */ 316 if (errno == EINVAL && unmap.size && !(unmap.iova + unmap.size) && 317 container->iommu_type == VFIO_TYPE1v2_IOMMU) { 318 trace_vfio_dma_unmap_overflow_workaround(); 319 unmap.size -= 1ULL << ctz64(container->pgsizes); 320 continue; 321 } 322 error_report("VFIO_UNMAP_DMA: %d", -errno); 323 return -errno; 324 } 325 326 return 0; 327 } 328 329 static int vfio_dma_map(VFIOContainer *container, hwaddr iova, 330 ram_addr_t size, void *vaddr, bool readonly) 331 { 332 struct vfio_iommu_type1_dma_map map = { 333 .argsz = sizeof(map), 334 .flags = VFIO_DMA_MAP_FLAG_READ, 335 .vaddr = (__u64)(uintptr_t)vaddr, 336 .iova = iova, 337 .size = size, 338 }; 339 340 if (!readonly) { 341 map.flags |= VFIO_DMA_MAP_FLAG_WRITE; 342 } 343 344 /* 345 * Try the mapping, if it fails with EBUSY, unmap the region and try 346 * again. This shouldn't be necessary, but we sometimes see it in 347 * the VGA ROM space. 348 */ 349 if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 || 350 (errno == EBUSY && vfio_dma_unmap(container, iova, size) == 0 && 351 ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) { 352 return 0; 353 } 354 355 error_report("VFIO_MAP_DMA: %d", -errno); 356 return -errno; 357 } 358 359 static void vfio_host_win_add(VFIOContainer *container, 360 hwaddr min_iova, hwaddr max_iova, 361 uint64_t iova_pgsizes) 362 { 363 VFIOHostDMAWindow *hostwin; 364 365 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 366 if (ranges_overlap(hostwin->min_iova, 367 hostwin->max_iova - hostwin->min_iova + 1, 368 min_iova, 369 max_iova - min_iova + 1)) { 370 hw_error("%s: Overlapped IOMMU are not enabled", __func__); 371 } 372 } 373 374 hostwin = g_malloc0(sizeof(*hostwin)); 375 376 hostwin->min_iova = min_iova; 377 hostwin->max_iova = max_iova; 378 hostwin->iova_pgsizes = iova_pgsizes; 379 QLIST_INSERT_HEAD(&container->hostwin_list, hostwin, hostwin_next); 380 } 381 382 static int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova, 383 hwaddr max_iova) 384 { 385 VFIOHostDMAWindow *hostwin; 386 387 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 388 if (hostwin->min_iova == min_iova && hostwin->max_iova == max_iova) { 389 QLIST_REMOVE(hostwin, hostwin_next); 390 return 0; 391 } 392 } 393 394 return -1; 395 } 396 397 static bool vfio_listener_skipped_section(MemoryRegionSection *section) 398 { 399 return (!memory_region_is_ram(section->mr) && 400 !memory_region_is_iommu(section->mr)) || 401 /* 402 * Sizing an enabled 64-bit BAR can cause spurious mappings to 403 * addresses in the upper part of the 64-bit address space. These 404 * are never accessed by the CPU and beyond the address width of 405 * some IOMMU hardware. TODO: VFIO should tell us the IOMMU width. 406 */ 407 section->offset_within_address_space & (1ULL << 63); 408 } 409 410 /* Called with rcu_read_lock held. */ 411 static bool vfio_get_vaddr(IOMMUTLBEntry *iotlb, void **vaddr, 412 bool *read_only) 413 { 414 MemoryRegion *mr; 415 hwaddr xlat; 416 hwaddr len = iotlb->addr_mask + 1; 417 bool writable = iotlb->perm & IOMMU_WO; 418 419 /* 420 * The IOMMU TLB entry we have just covers translation through 421 * this IOMMU to its immediate target. We need to translate 422 * it the rest of the way through to memory. 423 */ 424 mr = address_space_translate(&address_space_memory, 425 iotlb->translated_addr, 426 &xlat, &len, writable, 427 MEMTXATTRS_UNSPECIFIED); 428 if (!memory_region_is_ram(mr)) { 429 error_report("iommu map to non memory area %"HWADDR_PRIx"", 430 xlat); 431 return false; 432 } 433 434 /* 435 * Translation truncates length to the IOMMU page size, 436 * check that it did not truncate too much. 437 */ 438 if (len & iotlb->addr_mask) { 439 error_report("iommu has granularity incompatible with target AS"); 440 return false; 441 } 442 443 *vaddr = memory_region_get_ram_ptr(mr) + xlat; 444 *read_only = !writable || mr->readonly; 445 446 return true; 447 } 448 449 static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) 450 { 451 VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n); 452 VFIOContainer *container = giommu->container; 453 hwaddr iova = iotlb->iova + giommu->iommu_offset; 454 bool read_only; 455 void *vaddr; 456 int ret; 457 458 trace_vfio_iommu_map_notify(iotlb->perm == IOMMU_NONE ? "UNMAP" : "MAP", 459 iova, iova + iotlb->addr_mask); 460 461 if (iotlb->target_as != &address_space_memory) { 462 error_report("Wrong target AS \"%s\", only system memory is allowed", 463 iotlb->target_as->name ? iotlb->target_as->name : "none"); 464 return; 465 } 466 467 rcu_read_lock(); 468 469 if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) { 470 if (!vfio_get_vaddr(iotlb, &vaddr, &read_only)) { 471 goto out; 472 } 473 /* 474 * vaddr is only valid until rcu_read_unlock(). But after 475 * vfio_dma_map has set up the mapping the pages will be 476 * pinned by the kernel. This makes sure that the RAM backend 477 * of vaddr will always be there, even if the memory object is 478 * destroyed and its backing memory munmap-ed. 479 */ 480 ret = vfio_dma_map(container, iova, 481 iotlb->addr_mask + 1, vaddr, 482 read_only); 483 if (ret) { 484 error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", " 485 "0x%"HWADDR_PRIx", %p) = %d (%m)", 486 container, iova, 487 iotlb->addr_mask + 1, vaddr, ret); 488 } 489 } else { 490 ret = vfio_dma_unmap(container, iova, iotlb->addr_mask + 1); 491 if (ret) { 492 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " 493 "0x%"HWADDR_PRIx") = %d (%m)", 494 container, iova, 495 iotlb->addr_mask + 1, ret); 496 } 497 } 498 out: 499 rcu_read_unlock(); 500 } 501 502 static void vfio_listener_region_add(MemoryListener *listener, 503 MemoryRegionSection *section) 504 { 505 VFIOContainer *container = container_of(listener, VFIOContainer, listener); 506 hwaddr iova, end; 507 Int128 llend, llsize; 508 void *vaddr; 509 int ret; 510 VFIOHostDMAWindow *hostwin; 511 bool hostwin_found; 512 Error *err = NULL; 513 514 if (vfio_listener_skipped_section(section)) { 515 trace_vfio_listener_region_add_skip( 516 section->offset_within_address_space, 517 section->offset_within_address_space + 518 int128_get64(int128_sub(section->size, int128_one()))); 519 return; 520 } 521 522 if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) != 523 (section->offset_within_region & ~TARGET_PAGE_MASK))) { 524 error_report("%s received unaligned region", __func__); 525 return; 526 } 527 528 iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); 529 llend = int128_make64(section->offset_within_address_space); 530 llend = int128_add(llend, section->size); 531 llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); 532 533 if (int128_ge(int128_make64(iova), llend)) { 534 return; 535 } 536 end = int128_get64(int128_sub(llend, int128_one())); 537 538 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 539 hwaddr pgsize = 0; 540 541 /* For now intersections are not allowed, we may relax this later */ 542 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 543 if (ranges_overlap(hostwin->min_iova, 544 hostwin->max_iova - hostwin->min_iova + 1, 545 section->offset_within_address_space, 546 int128_get64(section->size))) { 547 error_setg(&err, 548 "region [0x%"PRIx64",0x%"PRIx64"] overlaps with existing" 549 "host DMA window [0x%"PRIx64",0x%"PRIx64"]", 550 section->offset_within_address_space, 551 section->offset_within_address_space + 552 int128_get64(section->size) - 1, 553 hostwin->min_iova, hostwin->max_iova); 554 goto fail; 555 } 556 } 557 558 ret = vfio_spapr_create_window(container, section, &pgsize); 559 if (ret) { 560 error_setg_errno(&err, -ret, "Failed to create SPAPR window"); 561 goto fail; 562 } 563 564 vfio_host_win_add(container, section->offset_within_address_space, 565 section->offset_within_address_space + 566 int128_get64(section->size) - 1, pgsize); 567 #ifdef CONFIG_KVM 568 if (kvm_enabled()) { 569 VFIOGroup *group; 570 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr); 571 struct kvm_vfio_spapr_tce param; 572 struct kvm_device_attr attr = { 573 .group = KVM_DEV_VFIO_GROUP, 574 .attr = KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE, 575 .addr = (uint64_t)(unsigned long)¶m, 576 }; 577 578 if (!memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_SPAPR_TCE_FD, 579 ¶m.tablefd)) { 580 QLIST_FOREACH(group, &container->group_list, container_next) { 581 param.groupfd = group->fd; 582 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 583 error_report("vfio: failed to setup fd %d " 584 "for a group with fd %d: %s", 585 param.tablefd, param.groupfd, 586 strerror(errno)); 587 return; 588 } 589 trace_vfio_spapr_group_attach(param.groupfd, param.tablefd); 590 } 591 } 592 } 593 #endif 594 } 595 596 hostwin_found = false; 597 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 598 if (hostwin->min_iova <= iova && end <= hostwin->max_iova) { 599 hostwin_found = true; 600 break; 601 } 602 } 603 604 if (!hostwin_found) { 605 error_setg(&err, "Container %p can't map guest IOVA region" 606 " 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx, container, iova, end); 607 goto fail; 608 } 609 610 memory_region_ref(section->mr); 611 612 if (memory_region_is_iommu(section->mr)) { 613 VFIOGuestIOMMU *giommu; 614 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr); 615 int iommu_idx; 616 617 trace_vfio_listener_region_add_iommu(iova, end); 618 /* 619 * FIXME: For VFIO iommu types which have KVM acceleration to 620 * avoid bouncing all map/unmaps through qemu this way, this 621 * would be the right place to wire that up (tell the KVM 622 * device emulation the VFIO iommu handles to use). 623 */ 624 giommu = g_malloc0(sizeof(*giommu)); 625 giommu->iommu = iommu_mr; 626 giommu->iommu_offset = section->offset_within_address_space - 627 section->offset_within_region; 628 giommu->container = container; 629 llend = int128_add(int128_make64(section->offset_within_region), 630 section->size); 631 llend = int128_sub(llend, int128_one()); 632 iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr, 633 MEMTXATTRS_UNSPECIFIED); 634 iommu_notifier_init(&giommu->n, vfio_iommu_map_notify, 635 IOMMU_NOTIFIER_ALL, 636 section->offset_within_region, 637 int128_get64(llend), 638 iommu_idx); 639 640 ret = memory_region_register_iommu_notifier(section->mr, &giommu->n, 641 &err); 642 if (ret) { 643 g_free(giommu); 644 goto fail; 645 } 646 QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next); 647 memory_region_iommu_replay(giommu->iommu, &giommu->n); 648 649 return; 650 } 651 652 /* Here we assume that memory_region_is_ram(section->mr)==true */ 653 654 vaddr = memory_region_get_ram_ptr(section->mr) + 655 section->offset_within_region + 656 (iova - section->offset_within_address_space); 657 658 trace_vfio_listener_region_add_ram(iova, end, vaddr); 659 660 llsize = int128_sub(llend, int128_make64(iova)); 661 662 if (memory_region_is_ram_device(section->mr)) { 663 hwaddr pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; 664 665 if ((iova & pgmask) || (int128_get64(llsize) & pgmask)) { 666 trace_vfio_listener_region_add_no_dma_map( 667 memory_region_name(section->mr), 668 section->offset_within_address_space, 669 int128_getlo(section->size), 670 pgmask + 1); 671 return; 672 } 673 } 674 675 ret = vfio_dma_map(container, iova, int128_get64(llsize), 676 vaddr, section->readonly); 677 if (ret) { 678 error_setg(&err, "vfio_dma_map(%p, 0x%"HWADDR_PRIx", " 679 "0x%"HWADDR_PRIx", %p) = %d (%m)", 680 container, iova, int128_get64(llsize), vaddr, ret); 681 if (memory_region_is_ram_device(section->mr)) { 682 /* Allow unexpected mappings not to be fatal for RAM devices */ 683 error_report_err(err); 684 return; 685 } 686 goto fail; 687 } 688 689 return; 690 691 fail: 692 if (memory_region_is_ram_device(section->mr)) { 693 error_report("failed to vfio_dma_map. pci p2p may not work"); 694 return; 695 } 696 /* 697 * On the initfn path, store the first error in the container so we 698 * can gracefully fail. Runtime, there's not much we can do other 699 * than throw a hardware error. 700 */ 701 if (!container->initialized) { 702 if (!container->error) { 703 error_propagate_prepend(&container->error, err, 704 "Region %s: ", 705 memory_region_name(section->mr)); 706 } else { 707 error_free(err); 708 } 709 } else { 710 error_report_err(err); 711 hw_error("vfio: DMA mapping failed, unable to continue"); 712 } 713 } 714 715 static void vfio_listener_region_del(MemoryListener *listener, 716 MemoryRegionSection *section) 717 { 718 VFIOContainer *container = container_of(listener, VFIOContainer, listener); 719 hwaddr iova, end; 720 Int128 llend, llsize; 721 int ret; 722 bool try_unmap = true; 723 724 if (vfio_listener_skipped_section(section)) { 725 trace_vfio_listener_region_del_skip( 726 section->offset_within_address_space, 727 section->offset_within_address_space + 728 int128_get64(int128_sub(section->size, int128_one()))); 729 return; 730 } 731 732 if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) != 733 (section->offset_within_region & ~TARGET_PAGE_MASK))) { 734 error_report("%s received unaligned region", __func__); 735 return; 736 } 737 738 if (memory_region_is_iommu(section->mr)) { 739 VFIOGuestIOMMU *giommu; 740 741 QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) { 742 if (MEMORY_REGION(giommu->iommu) == section->mr && 743 giommu->n.start == section->offset_within_region) { 744 memory_region_unregister_iommu_notifier(section->mr, 745 &giommu->n); 746 QLIST_REMOVE(giommu, giommu_next); 747 g_free(giommu); 748 break; 749 } 750 } 751 752 /* 753 * FIXME: We assume the one big unmap below is adequate to 754 * remove any individual page mappings in the IOMMU which 755 * might have been copied into VFIO. This works for a page table 756 * based IOMMU where a big unmap flattens a large range of IO-PTEs. 757 * That may not be true for all IOMMU types. 758 */ 759 } 760 761 iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); 762 llend = int128_make64(section->offset_within_address_space); 763 llend = int128_add(llend, section->size); 764 llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); 765 766 if (int128_ge(int128_make64(iova), llend)) { 767 return; 768 } 769 end = int128_get64(int128_sub(llend, int128_one())); 770 771 llsize = int128_sub(llend, int128_make64(iova)); 772 773 trace_vfio_listener_region_del(iova, end); 774 775 if (memory_region_is_ram_device(section->mr)) { 776 hwaddr pgmask; 777 VFIOHostDMAWindow *hostwin; 778 bool hostwin_found = false; 779 780 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 781 if (hostwin->min_iova <= iova && end <= hostwin->max_iova) { 782 hostwin_found = true; 783 break; 784 } 785 } 786 assert(hostwin_found); /* or region_add() would have failed */ 787 788 pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; 789 try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask)); 790 } 791 792 if (try_unmap) { 793 ret = vfio_dma_unmap(container, iova, int128_get64(llsize)); 794 if (ret) { 795 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " 796 "0x%"HWADDR_PRIx") = %d (%m)", 797 container, iova, int128_get64(llsize), ret); 798 } 799 } 800 801 memory_region_unref(section->mr); 802 803 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 804 vfio_spapr_remove_window(container, 805 section->offset_within_address_space); 806 if (vfio_host_win_del(container, 807 section->offset_within_address_space, 808 section->offset_within_address_space + 809 int128_get64(section->size) - 1) < 0) { 810 hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx, 811 __func__, section->offset_within_address_space); 812 } 813 } 814 } 815 816 static const MemoryListener vfio_memory_listener = { 817 .region_add = vfio_listener_region_add, 818 .region_del = vfio_listener_region_del, 819 }; 820 821 static void vfio_listener_release(VFIOContainer *container) 822 { 823 memory_listener_unregister(&container->listener); 824 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 825 memory_listener_unregister(&container->prereg_listener); 826 } 827 } 828 829 struct vfio_info_cap_header * 830 vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id) 831 { 832 struct vfio_info_cap_header *hdr; 833 void *ptr = info; 834 835 if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) { 836 return NULL; 837 } 838 839 for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) { 840 if (hdr->id == id) { 841 return hdr; 842 } 843 } 844 845 return NULL; 846 } 847 848 static int vfio_setup_region_sparse_mmaps(VFIORegion *region, 849 struct vfio_region_info *info) 850 { 851 struct vfio_info_cap_header *hdr; 852 struct vfio_region_info_cap_sparse_mmap *sparse; 853 int i, j; 854 855 hdr = vfio_get_region_info_cap(info, VFIO_REGION_INFO_CAP_SPARSE_MMAP); 856 if (!hdr) { 857 return -ENODEV; 858 } 859 860 sparse = container_of(hdr, struct vfio_region_info_cap_sparse_mmap, header); 861 862 trace_vfio_region_sparse_mmap_header(region->vbasedev->name, 863 region->nr, sparse->nr_areas); 864 865 region->mmaps = g_new0(VFIOMmap, sparse->nr_areas); 866 867 for (i = 0, j = 0; i < sparse->nr_areas; i++) { 868 trace_vfio_region_sparse_mmap_entry(i, sparse->areas[i].offset, 869 sparse->areas[i].offset + 870 sparse->areas[i].size); 871 872 if (sparse->areas[i].size) { 873 region->mmaps[j].offset = sparse->areas[i].offset; 874 region->mmaps[j].size = sparse->areas[i].size; 875 j++; 876 } 877 } 878 879 region->nr_mmaps = j; 880 region->mmaps = g_realloc(region->mmaps, j * sizeof(VFIOMmap)); 881 882 return 0; 883 } 884 885 int vfio_region_setup(Object *obj, VFIODevice *vbasedev, VFIORegion *region, 886 int index, const char *name) 887 { 888 struct vfio_region_info *info; 889 int ret; 890 891 ret = vfio_get_region_info(vbasedev, index, &info); 892 if (ret) { 893 return ret; 894 } 895 896 region->vbasedev = vbasedev; 897 region->flags = info->flags; 898 region->size = info->size; 899 region->fd_offset = info->offset; 900 region->nr = index; 901 902 if (region->size) { 903 region->mem = g_new0(MemoryRegion, 1); 904 memory_region_init_io(region->mem, obj, &vfio_region_ops, 905 region, name, region->size); 906 907 if (!vbasedev->no_mmap && 908 region->flags & VFIO_REGION_INFO_FLAG_MMAP) { 909 910 ret = vfio_setup_region_sparse_mmaps(region, info); 911 912 if (ret) { 913 region->nr_mmaps = 1; 914 region->mmaps = g_new0(VFIOMmap, region->nr_mmaps); 915 region->mmaps[0].offset = 0; 916 region->mmaps[0].size = region->size; 917 } 918 } 919 } 920 921 g_free(info); 922 923 trace_vfio_region_setup(vbasedev->name, index, name, 924 region->flags, region->fd_offset, region->size); 925 return 0; 926 } 927 928 int vfio_region_mmap(VFIORegion *region) 929 { 930 int i, prot = 0; 931 char *name; 932 933 if (!region->mem) { 934 return 0; 935 } 936 937 prot |= region->flags & VFIO_REGION_INFO_FLAG_READ ? PROT_READ : 0; 938 prot |= region->flags & VFIO_REGION_INFO_FLAG_WRITE ? PROT_WRITE : 0; 939 940 for (i = 0; i < region->nr_mmaps; i++) { 941 region->mmaps[i].mmap = mmap(NULL, region->mmaps[i].size, prot, 942 MAP_SHARED, region->vbasedev->fd, 943 region->fd_offset + 944 region->mmaps[i].offset); 945 if (region->mmaps[i].mmap == MAP_FAILED) { 946 int ret = -errno; 947 948 trace_vfio_region_mmap_fault(memory_region_name(region->mem), i, 949 region->fd_offset + 950 region->mmaps[i].offset, 951 region->fd_offset + 952 region->mmaps[i].offset + 953 region->mmaps[i].size - 1, ret); 954 955 region->mmaps[i].mmap = NULL; 956 957 for (i--; i >= 0; i--) { 958 memory_region_del_subregion(region->mem, ®ion->mmaps[i].mem); 959 munmap(region->mmaps[i].mmap, region->mmaps[i].size); 960 object_unparent(OBJECT(®ion->mmaps[i].mem)); 961 region->mmaps[i].mmap = NULL; 962 } 963 964 return ret; 965 } 966 967 name = g_strdup_printf("%s mmaps[%d]", 968 memory_region_name(region->mem), i); 969 memory_region_init_ram_device_ptr(®ion->mmaps[i].mem, 970 memory_region_owner(region->mem), 971 name, region->mmaps[i].size, 972 region->mmaps[i].mmap); 973 g_free(name); 974 memory_region_add_subregion(region->mem, region->mmaps[i].offset, 975 ®ion->mmaps[i].mem); 976 977 trace_vfio_region_mmap(memory_region_name(®ion->mmaps[i].mem), 978 region->mmaps[i].offset, 979 region->mmaps[i].offset + 980 region->mmaps[i].size - 1); 981 } 982 983 return 0; 984 } 985 986 void vfio_region_exit(VFIORegion *region) 987 { 988 int i; 989 990 if (!region->mem) { 991 return; 992 } 993 994 for (i = 0; i < region->nr_mmaps; i++) { 995 if (region->mmaps[i].mmap) { 996 memory_region_del_subregion(region->mem, ®ion->mmaps[i].mem); 997 } 998 } 999 1000 trace_vfio_region_exit(region->vbasedev->name, region->nr); 1001 } 1002 1003 void vfio_region_finalize(VFIORegion *region) 1004 { 1005 int i; 1006 1007 if (!region->mem) { 1008 return; 1009 } 1010 1011 for (i = 0; i < region->nr_mmaps; i++) { 1012 if (region->mmaps[i].mmap) { 1013 munmap(region->mmaps[i].mmap, region->mmaps[i].size); 1014 object_unparent(OBJECT(®ion->mmaps[i].mem)); 1015 } 1016 } 1017 1018 object_unparent(OBJECT(region->mem)); 1019 1020 g_free(region->mem); 1021 g_free(region->mmaps); 1022 1023 trace_vfio_region_finalize(region->vbasedev->name, region->nr); 1024 1025 region->mem = NULL; 1026 region->mmaps = NULL; 1027 region->nr_mmaps = 0; 1028 region->size = 0; 1029 region->flags = 0; 1030 region->nr = 0; 1031 } 1032 1033 void vfio_region_mmaps_set_enabled(VFIORegion *region, bool enabled) 1034 { 1035 int i; 1036 1037 if (!region->mem) { 1038 return; 1039 } 1040 1041 for (i = 0; i < region->nr_mmaps; i++) { 1042 if (region->mmaps[i].mmap) { 1043 memory_region_set_enabled(®ion->mmaps[i].mem, enabled); 1044 } 1045 } 1046 1047 trace_vfio_region_mmaps_set_enabled(memory_region_name(region->mem), 1048 enabled); 1049 } 1050 1051 void vfio_reset_handler(void *opaque) 1052 { 1053 VFIOGroup *group; 1054 VFIODevice *vbasedev; 1055 1056 QLIST_FOREACH(group, &vfio_group_list, next) { 1057 QLIST_FOREACH(vbasedev, &group->device_list, next) { 1058 if (vbasedev->dev->realized) { 1059 vbasedev->ops->vfio_compute_needs_reset(vbasedev); 1060 } 1061 } 1062 } 1063 1064 QLIST_FOREACH(group, &vfio_group_list, next) { 1065 QLIST_FOREACH(vbasedev, &group->device_list, next) { 1066 if (vbasedev->dev->realized && vbasedev->needs_reset) { 1067 vbasedev->ops->vfio_hot_reset_multi(vbasedev); 1068 } 1069 } 1070 } 1071 } 1072 1073 static void vfio_kvm_device_add_group(VFIOGroup *group) 1074 { 1075 #ifdef CONFIG_KVM 1076 struct kvm_device_attr attr = { 1077 .group = KVM_DEV_VFIO_GROUP, 1078 .attr = KVM_DEV_VFIO_GROUP_ADD, 1079 .addr = (uint64_t)(unsigned long)&group->fd, 1080 }; 1081 1082 if (!kvm_enabled()) { 1083 return; 1084 } 1085 1086 if (vfio_kvm_device_fd < 0) { 1087 struct kvm_create_device cd = { 1088 .type = KVM_DEV_TYPE_VFIO, 1089 }; 1090 1091 if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) { 1092 error_report("Failed to create KVM VFIO device: %m"); 1093 return; 1094 } 1095 1096 vfio_kvm_device_fd = cd.fd; 1097 } 1098 1099 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 1100 error_report("Failed to add group %d to KVM VFIO device: %m", 1101 group->groupid); 1102 } 1103 #endif 1104 } 1105 1106 static void vfio_kvm_device_del_group(VFIOGroup *group) 1107 { 1108 #ifdef CONFIG_KVM 1109 struct kvm_device_attr attr = { 1110 .group = KVM_DEV_VFIO_GROUP, 1111 .attr = KVM_DEV_VFIO_GROUP_DEL, 1112 .addr = (uint64_t)(unsigned long)&group->fd, 1113 }; 1114 1115 if (vfio_kvm_device_fd < 0) { 1116 return; 1117 } 1118 1119 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 1120 error_report("Failed to remove group %d from KVM VFIO device: %m", 1121 group->groupid); 1122 } 1123 #endif 1124 } 1125 1126 static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as) 1127 { 1128 VFIOAddressSpace *space; 1129 1130 QLIST_FOREACH(space, &vfio_address_spaces, list) { 1131 if (space->as == as) { 1132 return space; 1133 } 1134 } 1135 1136 /* No suitable VFIOAddressSpace, create a new one */ 1137 space = g_malloc0(sizeof(*space)); 1138 space->as = as; 1139 QLIST_INIT(&space->containers); 1140 1141 QLIST_INSERT_HEAD(&vfio_address_spaces, space, list); 1142 1143 return space; 1144 } 1145 1146 static void vfio_put_address_space(VFIOAddressSpace *space) 1147 { 1148 if (QLIST_EMPTY(&space->containers)) { 1149 QLIST_REMOVE(space, list); 1150 g_free(space); 1151 } 1152 } 1153 1154 /* 1155 * vfio_get_iommu_type - selects the richest iommu_type (v2 first) 1156 */ 1157 static int vfio_get_iommu_type(VFIOContainer *container, 1158 Error **errp) 1159 { 1160 int iommu_types[] = { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU, 1161 VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU }; 1162 int i; 1163 1164 for (i = 0; i < ARRAY_SIZE(iommu_types); i++) { 1165 if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) { 1166 return iommu_types[i]; 1167 } 1168 } 1169 error_setg(errp, "No available IOMMU models"); 1170 return -EINVAL; 1171 } 1172 1173 static int vfio_init_container(VFIOContainer *container, int group_fd, 1174 Error **errp) 1175 { 1176 int iommu_type, ret; 1177 1178 iommu_type = vfio_get_iommu_type(container, errp); 1179 if (iommu_type < 0) { 1180 return iommu_type; 1181 } 1182 1183 ret = ioctl(group_fd, VFIO_GROUP_SET_CONTAINER, &container->fd); 1184 if (ret) { 1185 error_setg_errno(errp, errno, "Failed to set group container"); 1186 return -errno; 1187 } 1188 1189 while (ioctl(container->fd, VFIO_SET_IOMMU, iommu_type)) { 1190 if (iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 1191 /* 1192 * On sPAPR, despite the IOMMU subdriver always advertises v1 and 1193 * v2, the running platform may not support v2 and there is no 1194 * way to guess it until an IOMMU group gets added to the container. 1195 * So in case it fails with v2, try v1 as a fallback. 1196 */ 1197 iommu_type = VFIO_SPAPR_TCE_IOMMU; 1198 continue; 1199 } 1200 error_setg_errno(errp, errno, "Failed to set iommu for container"); 1201 return -errno; 1202 } 1203 1204 container->iommu_type = iommu_type; 1205 return 0; 1206 } 1207 1208 static int vfio_connect_container(VFIOGroup *group, AddressSpace *as, 1209 Error **errp) 1210 { 1211 VFIOContainer *container; 1212 int ret, fd; 1213 VFIOAddressSpace *space; 1214 1215 space = vfio_get_address_space(as); 1216 1217 /* 1218 * VFIO is currently incompatible with memory ballooning insofar as the 1219 * madvise to purge (zap) the page from QEMU's address space does not 1220 * interact with the memory API and therefore leaves stale virtual to 1221 * physical mappings in the IOMMU if the page was previously pinned. We 1222 * therefore add a balloon inhibit for each group added to a container, 1223 * whether the container is used individually or shared. This provides 1224 * us with options to allow devices within a group to opt-in and allow 1225 * ballooning, so long as it is done consistently for a group (for instance 1226 * if the device is an mdev device where it is known that the host vendor 1227 * driver will never pin pages outside of the working set of the guest 1228 * driver, which would thus not be ballooning candidates). 1229 * 1230 * The first opportunity to induce pinning occurs here where we attempt to 1231 * attach the group to existing containers within the AddressSpace. If any 1232 * pages are already zapped from the virtual address space, such as from a 1233 * previous ballooning opt-in, new pinning will cause valid mappings to be 1234 * re-established. Likewise, when the overall MemoryListener for a new 1235 * container is registered, a replay of mappings within the AddressSpace 1236 * will occur, re-establishing any previously zapped pages as well. 1237 * 1238 * NB. Balloon inhibiting does not currently block operation of the 1239 * balloon driver or revoke previously pinned pages, it only prevents 1240 * calling madvise to modify the virtual mapping of ballooned pages. 1241 */ 1242 qemu_balloon_inhibit(true); 1243 1244 QLIST_FOREACH(container, &space->containers, next) { 1245 if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) { 1246 group->container = container; 1247 QLIST_INSERT_HEAD(&container->group_list, group, container_next); 1248 vfio_kvm_device_add_group(group); 1249 return 0; 1250 } 1251 } 1252 1253 fd = qemu_open("/dev/vfio/vfio", O_RDWR); 1254 if (fd < 0) { 1255 error_setg_errno(errp, errno, "failed to open /dev/vfio/vfio"); 1256 ret = -errno; 1257 goto put_space_exit; 1258 } 1259 1260 ret = ioctl(fd, VFIO_GET_API_VERSION); 1261 if (ret != VFIO_API_VERSION) { 1262 error_setg(errp, "supported vfio version: %d, " 1263 "reported version: %d", VFIO_API_VERSION, ret); 1264 ret = -EINVAL; 1265 goto close_fd_exit; 1266 } 1267 1268 container = g_malloc0(sizeof(*container)); 1269 container->space = space; 1270 container->fd = fd; 1271 container->error = NULL; 1272 QLIST_INIT(&container->giommu_list); 1273 QLIST_INIT(&container->hostwin_list); 1274 1275 ret = vfio_init_container(container, group->fd, errp); 1276 if (ret) { 1277 goto free_container_exit; 1278 } 1279 1280 switch (container->iommu_type) { 1281 case VFIO_TYPE1v2_IOMMU: 1282 case VFIO_TYPE1_IOMMU: 1283 { 1284 struct vfio_iommu_type1_info info; 1285 1286 /* 1287 * FIXME: This assumes that a Type1 IOMMU can map any 64-bit 1288 * IOVA whatsoever. That's not actually true, but the current 1289 * kernel interface doesn't tell us what it can map, and the 1290 * existing Type1 IOMMUs generally support any IOVA we're 1291 * going to actually try in practice. 1292 */ 1293 info.argsz = sizeof(info); 1294 ret = ioctl(fd, VFIO_IOMMU_GET_INFO, &info); 1295 /* Ignore errors */ 1296 if (ret || !(info.flags & VFIO_IOMMU_INFO_PGSIZES)) { 1297 /* Assume 4k IOVA page size */ 1298 info.iova_pgsizes = 4096; 1299 } 1300 vfio_host_win_add(container, 0, (hwaddr)-1, info.iova_pgsizes); 1301 container->pgsizes = info.iova_pgsizes; 1302 break; 1303 } 1304 case VFIO_SPAPR_TCE_v2_IOMMU: 1305 case VFIO_SPAPR_TCE_IOMMU: 1306 { 1307 struct vfio_iommu_spapr_tce_info info; 1308 bool v2 = container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU; 1309 1310 /* 1311 * The host kernel code implementing VFIO_IOMMU_DISABLE is called 1312 * when container fd is closed so we do not call it explicitly 1313 * in this file. 1314 */ 1315 if (!v2) { 1316 ret = ioctl(fd, VFIO_IOMMU_ENABLE); 1317 if (ret) { 1318 error_setg_errno(errp, errno, "failed to enable container"); 1319 ret = -errno; 1320 goto free_container_exit; 1321 } 1322 } else { 1323 container->prereg_listener = vfio_prereg_listener; 1324 1325 memory_listener_register(&container->prereg_listener, 1326 &address_space_memory); 1327 if (container->error) { 1328 memory_listener_unregister(&container->prereg_listener); 1329 ret = -1; 1330 error_propagate_prepend(errp, container->error, 1331 "RAM memory listener initialization failed: "); 1332 goto free_container_exit; 1333 } 1334 } 1335 1336 info.argsz = sizeof(info); 1337 ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info); 1338 if (ret) { 1339 error_setg_errno(errp, errno, 1340 "VFIO_IOMMU_SPAPR_TCE_GET_INFO failed"); 1341 ret = -errno; 1342 if (v2) { 1343 memory_listener_unregister(&container->prereg_listener); 1344 } 1345 goto free_container_exit; 1346 } 1347 1348 if (v2) { 1349 container->pgsizes = info.ddw.pgsizes; 1350 /* 1351 * There is a default window in just created container. 1352 * To make region_add/del simpler, we better remove this 1353 * window now and let those iommu_listener callbacks 1354 * create/remove them when needed. 1355 */ 1356 ret = vfio_spapr_remove_window(container, info.dma32_window_start); 1357 if (ret) { 1358 error_setg_errno(errp, -ret, 1359 "failed to remove existing window"); 1360 goto free_container_exit; 1361 } 1362 } else { 1363 /* The default table uses 4K pages */ 1364 container->pgsizes = 0x1000; 1365 vfio_host_win_add(container, info.dma32_window_start, 1366 info.dma32_window_start + 1367 info.dma32_window_size - 1, 1368 0x1000); 1369 } 1370 } 1371 } 1372 1373 vfio_kvm_device_add_group(group); 1374 1375 QLIST_INIT(&container->group_list); 1376 QLIST_INSERT_HEAD(&space->containers, container, next); 1377 1378 group->container = container; 1379 QLIST_INSERT_HEAD(&container->group_list, group, container_next); 1380 1381 container->listener = vfio_memory_listener; 1382 1383 memory_listener_register(&container->listener, container->space->as); 1384 1385 if (container->error) { 1386 ret = -1; 1387 error_propagate_prepend(errp, container->error, 1388 "memory listener initialization failed: "); 1389 goto listener_release_exit; 1390 } 1391 1392 container->initialized = true; 1393 1394 return 0; 1395 listener_release_exit: 1396 QLIST_REMOVE(group, container_next); 1397 QLIST_REMOVE(container, next); 1398 vfio_kvm_device_del_group(group); 1399 vfio_listener_release(container); 1400 1401 free_container_exit: 1402 g_free(container); 1403 1404 close_fd_exit: 1405 close(fd); 1406 1407 put_space_exit: 1408 qemu_balloon_inhibit(false); 1409 vfio_put_address_space(space); 1410 1411 return ret; 1412 } 1413 1414 static void vfio_disconnect_container(VFIOGroup *group) 1415 { 1416 VFIOContainer *container = group->container; 1417 1418 QLIST_REMOVE(group, container_next); 1419 group->container = NULL; 1420 1421 /* 1422 * Explicitly release the listener first before unset container, 1423 * since unset may destroy the backend container if it's the last 1424 * group. 1425 */ 1426 if (QLIST_EMPTY(&container->group_list)) { 1427 vfio_listener_release(container); 1428 } 1429 1430 if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) { 1431 error_report("vfio: error disconnecting group %d from container", 1432 group->groupid); 1433 } 1434 1435 if (QLIST_EMPTY(&container->group_list)) { 1436 VFIOAddressSpace *space = container->space; 1437 VFIOGuestIOMMU *giommu, *tmp; 1438 1439 QLIST_REMOVE(container, next); 1440 1441 QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) { 1442 memory_region_unregister_iommu_notifier( 1443 MEMORY_REGION(giommu->iommu), &giommu->n); 1444 QLIST_REMOVE(giommu, giommu_next); 1445 g_free(giommu); 1446 } 1447 1448 trace_vfio_disconnect_container(container->fd); 1449 close(container->fd); 1450 g_free(container); 1451 1452 vfio_put_address_space(space); 1453 } 1454 } 1455 1456 VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp) 1457 { 1458 VFIOGroup *group; 1459 char path[32]; 1460 struct vfio_group_status status = { .argsz = sizeof(status) }; 1461 1462 QLIST_FOREACH(group, &vfio_group_list, next) { 1463 if (group->groupid == groupid) { 1464 /* Found it. Now is it already in the right context? */ 1465 if (group->container->space->as == as) { 1466 return group; 1467 } else { 1468 error_setg(errp, "group %d used in multiple address spaces", 1469 group->groupid); 1470 return NULL; 1471 } 1472 } 1473 } 1474 1475 group = g_malloc0(sizeof(*group)); 1476 1477 snprintf(path, sizeof(path), "/dev/vfio/%d", groupid); 1478 group->fd = qemu_open(path, O_RDWR); 1479 if (group->fd < 0) { 1480 error_setg_errno(errp, errno, "failed to open %s", path); 1481 goto free_group_exit; 1482 } 1483 1484 if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) { 1485 error_setg_errno(errp, errno, "failed to get group %d status", groupid); 1486 goto close_fd_exit; 1487 } 1488 1489 if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) { 1490 error_setg(errp, "group %d is not viable", groupid); 1491 error_append_hint(errp, 1492 "Please ensure all devices within the iommu_group " 1493 "are bound to their vfio bus driver.\n"); 1494 goto close_fd_exit; 1495 } 1496 1497 group->groupid = groupid; 1498 QLIST_INIT(&group->device_list); 1499 1500 if (vfio_connect_container(group, as, errp)) { 1501 error_prepend(errp, "failed to setup container for group %d: ", 1502 groupid); 1503 goto close_fd_exit; 1504 } 1505 1506 if (QLIST_EMPTY(&vfio_group_list)) { 1507 qemu_register_reset(vfio_reset_handler, NULL); 1508 } 1509 1510 QLIST_INSERT_HEAD(&vfio_group_list, group, next); 1511 1512 return group; 1513 1514 close_fd_exit: 1515 close(group->fd); 1516 1517 free_group_exit: 1518 g_free(group); 1519 1520 return NULL; 1521 } 1522 1523 void vfio_put_group(VFIOGroup *group) 1524 { 1525 if (!group || !QLIST_EMPTY(&group->device_list)) { 1526 return; 1527 } 1528 1529 if (!group->balloon_allowed) { 1530 qemu_balloon_inhibit(false); 1531 } 1532 vfio_kvm_device_del_group(group); 1533 vfio_disconnect_container(group); 1534 QLIST_REMOVE(group, next); 1535 trace_vfio_put_group(group->fd); 1536 close(group->fd); 1537 g_free(group); 1538 1539 if (QLIST_EMPTY(&vfio_group_list)) { 1540 qemu_unregister_reset(vfio_reset_handler, NULL); 1541 } 1542 } 1543 1544 int vfio_get_device(VFIOGroup *group, const char *name, 1545 VFIODevice *vbasedev, Error **errp) 1546 { 1547 struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) }; 1548 int ret, fd; 1549 1550 fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name); 1551 if (fd < 0) { 1552 error_setg_errno(errp, errno, "error getting device from group %d", 1553 group->groupid); 1554 error_append_hint(errp, 1555 "Verify all devices in group %d are bound to vfio-<bus> " 1556 "or pci-stub and not already in use\n", group->groupid); 1557 return fd; 1558 } 1559 1560 ret = ioctl(fd, VFIO_DEVICE_GET_INFO, &dev_info); 1561 if (ret) { 1562 error_setg_errno(errp, errno, "error getting device info"); 1563 close(fd); 1564 return ret; 1565 } 1566 1567 /* 1568 * Clear the balloon inhibitor for this group if the driver knows the 1569 * device operates compatibly with ballooning. Setting must be consistent 1570 * per group, but since compatibility is really only possible with mdev 1571 * currently, we expect singleton groups. 1572 */ 1573 if (vbasedev->balloon_allowed != group->balloon_allowed) { 1574 if (!QLIST_EMPTY(&group->device_list)) { 1575 error_setg(errp, 1576 "Inconsistent device balloon setting within group"); 1577 close(fd); 1578 return -1; 1579 } 1580 1581 if (!group->balloon_allowed) { 1582 group->balloon_allowed = true; 1583 qemu_balloon_inhibit(false); 1584 } 1585 } 1586 1587 vbasedev->fd = fd; 1588 vbasedev->group = group; 1589 QLIST_INSERT_HEAD(&group->device_list, vbasedev, next); 1590 1591 vbasedev->num_irqs = dev_info.num_irqs; 1592 vbasedev->num_regions = dev_info.num_regions; 1593 vbasedev->flags = dev_info.flags; 1594 1595 trace_vfio_get_device(name, dev_info.flags, dev_info.num_regions, 1596 dev_info.num_irqs); 1597 1598 vbasedev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET); 1599 return 0; 1600 } 1601 1602 void vfio_put_base_device(VFIODevice *vbasedev) 1603 { 1604 if (!vbasedev->group) { 1605 return; 1606 } 1607 QLIST_REMOVE(vbasedev, next); 1608 vbasedev->group = NULL; 1609 trace_vfio_put_base_device(vbasedev->fd); 1610 close(vbasedev->fd); 1611 } 1612 1613 int vfio_get_region_info(VFIODevice *vbasedev, int index, 1614 struct vfio_region_info **info) 1615 { 1616 size_t argsz = sizeof(struct vfio_region_info); 1617 1618 *info = g_malloc0(argsz); 1619 1620 (*info)->index = index; 1621 retry: 1622 (*info)->argsz = argsz; 1623 1624 if (ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, *info)) { 1625 g_free(*info); 1626 *info = NULL; 1627 return -errno; 1628 } 1629 1630 if ((*info)->argsz > argsz) { 1631 argsz = (*info)->argsz; 1632 *info = g_realloc(*info, argsz); 1633 1634 goto retry; 1635 } 1636 1637 return 0; 1638 } 1639 1640 int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t type, 1641 uint32_t subtype, struct vfio_region_info **info) 1642 { 1643 int i; 1644 1645 for (i = 0; i < vbasedev->num_regions; i++) { 1646 struct vfio_info_cap_header *hdr; 1647 struct vfio_region_info_cap_type *cap_type; 1648 1649 if (vfio_get_region_info(vbasedev, i, info)) { 1650 continue; 1651 } 1652 1653 hdr = vfio_get_region_info_cap(*info, VFIO_REGION_INFO_CAP_TYPE); 1654 if (!hdr) { 1655 g_free(*info); 1656 continue; 1657 } 1658 1659 cap_type = container_of(hdr, struct vfio_region_info_cap_type, header); 1660 1661 trace_vfio_get_dev_region(vbasedev->name, i, 1662 cap_type->type, cap_type->subtype); 1663 1664 if (cap_type->type == type && cap_type->subtype == subtype) { 1665 return 0; 1666 } 1667 1668 g_free(*info); 1669 } 1670 1671 *info = NULL; 1672 return -ENODEV; 1673 } 1674 1675 bool vfio_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_type) 1676 { 1677 struct vfio_region_info *info = NULL; 1678 bool ret = false; 1679 1680 if (!vfio_get_region_info(vbasedev, region, &info)) { 1681 if (vfio_get_region_info_cap(info, cap_type)) { 1682 ret = true; 1683 } 1684 g_free(info); 1685 } 1686 1687 return ret; 1688 } 1689 1690 /* 1691 * Interfaces for IBM EEH (Enhanced Error Handling) 1692 */ 1693 static bool vfio_eeh_container_ok(VFIOContainer *container) 1694 { 1695 /* 1696 * As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO 1697 * implementation is broken if there are multiple groups in a 1698 * container. The hardware works in units of Partitionable 1699 * Endpoints (== IOMMU groups) and the EEH operations naively 1700 * iterate across all groups in the container, without any logic 1701 * to make sure the groups have their state synchronized. For 1702 * certain operations (ENABLE) that might be ok, until an error 1703 * occurs, but for others (GET_STATE) it's clearly broken. 1704 */ 1705 1706 /* 1707 * XXX Once fixed kernels exist, test for them here 1708 */ 1709 1710 if (QLIST_EMPTY(&container->group_list)) { 1711 return false; 1712 } 1713 1714 if (QLIST_NEXT(QLIST_FIRST(&container->group_list), container_next)) { 1715 return false; 1716 } 1717 1718 return true; 1719 } 1720 1721 static int vfio_eeh_container_op(VFIOContainer *container, uint32_t op) 1722 { 1723 struct vfio_eeh_pe_op pe_op = { 1724 .argsz = sizeof(pe_op), 1725 .op = op, 1726 }; 1727 int ret; 1728 1729 if (!vfio_eeh_container_ok(container)) { 1730 error_report("vfio/eeh: EEH_PE_OP 0x%x: " 1731 "kernel requires a container with exactly one group", op); 1732 return -EPERM; 1733 } 1734 1735 ret = ioctl(container->fd, VFIO_EEH_PE_OP, &pe_op); 1736 if (ret < 0) { 1737 error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op); 1738 return -errno; 1739 } 1740 1741 return ret; 1742 } 1743 1744 static VFIOContainer *vfio_eeh_as_container(AddressSpace *as) 1745 { 1746 VFIOAddressSpace *space = vfio_get_address_space(as); 1747 VFIOContainer *container = NULL; 1748 1749 if (QLIST_EMPTY(&space->containers)) { 1750 /* No containers to act on */ 1751 goto out; 1752 } 1753 1754 container = QLIST_FIRST(&space->containers); 1755 1756 if (QLIST_NEXT(container, next)) { 1757 /* We don't yet have logic to synchronize EEH state across 1758 * multiple containers */ 1759 container = NULL; 1760 goto out; 1761 } 1762 1763 out: 1764 vfio_put_address_space(space); 1765 return container; 1766 } 1767 1768 bool vfio_eeh_as_ok(AddressSpace *as) 1769 { 1770 VFIOContainer *container = vfio_eeh_as_container(as); 1771 1772 return (container != NULL) && vfio_eeh_container_ok(container); 1773 } 1774 1775 int vfio_eeh_as_op(AddressSpace *as, uint32_t op) 1776 { 1777 VFIOContainer *container = vfio_eeh_as_container(as); 1778 1779 if (!container) { 1780 return -ENODEV; 1781 } 1782 return vfio_eeh_container_op(container, op); 1783 } 1784