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; 512 513 if (vfio_listener_skipped_section(section)) { 514 trace_vfio_listener_region_add_skip( 515 section->offset_within_address_space, 516 section->offset_within_address_space + 517 int128_get64(int128_sub(section->size, int128_one()))); 518 return; 519 } 520 521 if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) != 522 (section->offset_within_region & ~TARGET_PAGE_MASK))) { 523 error_report("%s received unaligned region", __func__); 524 return; 525 } 526 527 iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); 528 llend = int128_make64(section->offset_within_address_space); 529 llend = int128_add(llend, section->size); 530 llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); 531 532 if (int128_ge(int128_make64(iova), llend)) { 533 return; 534 } 535 end = int128_get64(int128_sub(llend, int128_one())); 536 537 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 538 hwaddr pgsize = 0; 539 540 /* For now intersections are not allowed, we may relax this later */ 541 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 542 if (ranges_overlap(hostwin->min_iova, 543 hostwin->max_iova - hostwin->min_iova + 1, 544 section->offset_within_address_space, 545 int128_get64(section->size))) { 546 ret = -1; 547 goto fail; 548 } 549 } 550 551 ret = vfio_spapr_create_window(container, section, &pgsize); 552 if (ret) { 553 goto fail; 554 } 555 556 vfio_host_win_add(container, section->offset_within_address_space, 557 section->offset_within_address_space + 558 int128_get64(section->size) - 1, pgsize); 559 #ifdef CONFIG_KVM 560 if (kvm_enabled()) { 561 VFIOGroup *group; 562 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr); 563 struct kvm_vfio_spapr_tce param; 564 struct kvm_device_attr attr = { 565 .group = KVM_DEV_VFIO_GROUP, 566 .attr = KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE, 567 .addr = (uint64_t)(unsigned long)¶m, 568 }; 569 570 if (!memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_SPAPR_TCE_FD, 571 ¶m.tablefd)) { 572 QLIST_FOREACH(group, &container->group_list, container_next) { 573 param.groupfd = group->fd; 574 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 575 error_report("vfio: failed to setup fd %d " 576 "for a group with fd %d: %s", 577 param.tablefd, param.groupfd, 578 strerror(errno)); 579 return; 580 } 581 trace_vfio_spapr_group_attach(param.groupfd, param.tablefd); 582 } 583 } 584 } 585 #endif 586 } 587 588 hostwin_found = false; 589 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 590 if (hostwin->min_iova <= iova && end <= hostwin->max_iova) { 591 hostwin_found = true; 592 break; 593 } 594 } 595 596 if (!hostwin_found) { 597 error_report("vfio: IOMMU container %p can't map guest IOVA region" 598 " 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx, 599 container, iova, end); 600 ret = -EFAULT; 601 goto fail; 602 } 603 604 memory_region_ref(section->mr); 605 606 if (memory_region_is_iommu(section->mr)) { 607 VFIOGuestIOMMU *giommu; 608 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr); 609 int iommu_idx; 610 611 trace_vfio_listener_region_add_iommu(iova, end); 612 /* 613 * FIXME: For VFIO iommu types which have KVM acceleration to 614 * avoid bouncing all map/unmaps through qemu this way, this 615 * would be the right place to wire that up (tell the KVM 616 * device emulation the VFIO iommu handles to use). 617 */ 618 giommu = g_malloc0(sizeof(*giommu)); 619 giommu->iommu = iommu_mr; 620 giommu->iommu_offset = section->offset_within_address_space - 621 section->offset_within_region; 622 giommu->container = container; 623 llend = int128_add(int128_make64(section->offset_within_region), 624 section->size); 625 llend = int128_sub(llend, int128_one()); 626 iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr, 627 MEMTXATTRS_UNSPECIFIED); 628 iommu_notifier_init(&giommu->n, vfio_iommu_map_notify, 629 IOMMU_NOTIFIER_ALL, 630 section->offset_within_region, 631 int128_get64(llend), 632 iommu_idx); 633 QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next); 634 635 memory_region_register_iommu_notifier(section->mr, &giommu->n); 636 memory_region_iommu_replay(giommu->iommu, &giommu->n); 637 638 return; 639 } 640 641 /* Here we assume that memory_region_is_ram(section->mr)==true */ 642 643 vaddr = memory_region_get_ram_ptr(section->mr) + 644 section->offset_within_region + 645 (iova - section->offset_within_address_space); 646 647 trace_vfio_listener_region_add_ram(iova, end, vaddr); 648 649 llsize = int128_sub(llend, int128_make64(iova)); 650 651 if (memory_region_is_ram_device(section->mr)) { 652 hwaddr pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; 653 654 if ((iova & pgmask) || (int128_get64(llsize) & pgmask)) { 655 trace_vfio_listener_region_add_no_dma_map( 656 memory_region_name(section->mr), 657 section->offset_within_address_space, 658 int128_getlo(section->size), 659 pgmask + 1); 660 return; 661 } 662 } 663 664 ret = vfio_dma_map(container, iova, int128_get64(llsize), 665 vaddr, section->readonly); 666 if (ret) { 667 error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", " 668 "0x%"HWADDR_PRIx", %p) = %d (%m)", 669 container, iova, int128_get64(llsize), vaddr, ret); 670 if (memory_region_is_ram_device(section->mr)) { 671 /* Allow unexpected mappings not to be fatal for RAM devices */ 672 return; 673 } 674 goto fail; 675 } 676 677 return; 678 679 fail: 680 if (memory_region_is_ram_device(section->mr)) { 681 error_report("failed to vfio_dma_map. pci p2p may not work"); 682 return; 683 } 684 /* 685 * On the initfn path, store the first error in the container so we 686 * can gracefully fail. Runtime, there's not much we can do other 687 * than throw a hardware error. 688 */ 689 if (!container->initialized) { 690 if (!container->error) { 691 container->error = ret; 692 } 693 } else { 694 hw_error("vfio: DMA mapping failed, unable to continue"); 695 } 696 } 697 698 static void vfio_listener_region_del(MemoryListener *listener, 699 MemoryRegionSection *section) 700 { 701 VFIOContainer *container = container_of(listener, VFIOContainer, listener); 702 hwaddr iova, end; 703 Int128 llend, llsize; 704 int ret; 705 bool try_unmap = true; 706 707 if (vfio_listener_skipped_section(section)) { 708 trace_vfio_listener_region_del_skip( 709 section->offset_within_address_space, 710 section->offset_within_address_space + 711 int128_get64(int128_sub(section->size, int128_one()))); 712 return; 713 } 714 715 if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) != 716 (section->offset_within_region & ~TARGET_PAGE_MASK))) { 717 error_report("%s received unaligned region", __func__); 718 return; 719 } 720 721 if (memory_region_is_iommu(section->mr)) { 722 VFIOGuestIOMMU *giommu; 723 724 QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) { 725 if (MEMORY_REGION(giommu->iommu) == section->mr && 726 giommu->n.start == section->offset_within_region) { 727 memory_region_unregister_iommu_notifier(section->mr, 728 &giommu->n); 729 QLIST_REMOVE(giommu, giommu_next); 730 g_free(giommu); 731 break; 732 } 733 } 734 735 /* 736 * FIXME: We assume the one big unmap below is adequate to 737 * remove any individual page mappings in the IOMMU which 738 * might have been copied into VFIO. This works for a page table 739 * based IOMMU where a big unmap flattens a large range of IO-PTEs. 740 * That may not be true for all IOMMU types. 741 */ 742 } 743 744 iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); 745 llend = int128_make64(section->offset_within_address_space); 746 llend = int128_add(llend, section->size); 747 llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); 748 749 if (int128_ge(int128_make64(iova), llend)) { 750 return; 751 } 752 end = int128_get64(int128_sub(llend, int128_one())); 753 754 llsize = int128_sub(llend, int128_make64(iova)); 755 756 trace_vfio_listener_region_del(iova, end); 757 758 if (memory_region_is_ram_device(section->mr)) { 759 hwaddr pgmask; 760 VFIOHostDMAWindow *hostwin; 761 bool hostwin_found = false; 762 763 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 764 if (hostwin->min_iova <= iova && end <= hostwin->max_iova) { 765 hostwin_found = true; 766 break; 767 } 768 } 769 assert(hostwin_found); /* or region_add() would have failed */ 770 771 pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; 772 try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask)); 773 } 774 775 if (try_unmap) { 776 ret = vfio_dma_unmap(container, iova, int128_get64(llsize)); 777 if (ret) { 778 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " 779 "0x%"HWADDR_PRIx") = %d (%m)", 780 container, iova, int128_get64(llsize), ret); 781 } 782 } 783 784 memory_region_unref(section->mr); 785 786 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 787 vfio_spapr_remove_window(container, 788 section->offset_within_address_space); 789 if (vfio_host_win_del(container, 790 section->offset_within_address_space, 791 section->offset_within_address_space + 792 int128_get64(section->size) - 1) < 0) { 793 hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx, 794 __func__, section->offset_within_address_space); 795 } 796 } 797 } 798 799 static const MemoryListener vfio_memory_listener = { 800 .region_add = vfio_listener_region_add, 801 .region_del = vfio_listener_region_del, 802 }; 803 804 static void vfio_listener_release(VFIOContainer *container) 805 { 806 memory_listener_unregister(&container->listener); 807 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 808 memory_listener_unregister(&container->prereg_listener); 809 } 810 } 811 812 struct vfio_info_cap_header * 813 vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id) 814 { 815 struct vfio_info_cap_header *hdr; 816 void *ptr = info; 817 818 if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) { 819 return NULL; 820 } 821 822 for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) { 823 if (hdr->id == id) { 824 return hdr; 825 } 826 } 827 828 return NULL; 829 } 830 831 static int vfio_setup_region_sparse_mmaps(VFIORegion *region, 832 struct vfio_region_info *info) 833 { 834 struct vfio_info_cap_header *hdr; 835 struct vfio_region_info_cap_sparse_mmap *sparse; 836 int i, j; 837 838 hdr = vfio_get_region_info_cap(info, VFIO_REGION_INFO_CAP_SPARSE_MMAP); 839 if (!hdr) { 840 return -ENODEV; 841 } 842 843 sparse = container_of(hdr, struct vfio_region_info_cap_sparse_mmap, header); 844 845 trace_vfio_region_sparse_mmap_header(region->vbasedev->name, 846 region->nr, sparse->nr_areas); 847 848 region->mmaps = g_new0(VFIOMmap, sparse->nr_areas); 849 850 for (i = 0, j = 0; i < sparse->nr_areas; i++) { 851 trace_vfio_region_sparse_mmap_entry(i, sparse->areas[i].offset, 852 sparse->areas[i].offset + 853 sparse->areas[i].size); 854 855 if (sparse->areas[i].size) { 856 region->mmaps[j].offset = sparse->areas[i].offset; 857 region->mmaps[j].size = sparse->areas[i].size; 858 j++; 859 } 860 } 861 862 region->nr_mmaps = j; 863 region->mmaps = g_realloc(region->mmaps, j * sizeof(VFIOMmap)); 864 865 return 0; 866 } 867 868 int vfio_region_setup(Object *obj, VFIODevice *vbasedev, VFIORegion *region, 869 int index, const char *name) 870 { 871 struct vfio_region_info *info; 872 int ret; 873 874 ret = vfio_get_region_info(vbasedev, index, &info); 875 if (ret) { 876 return ret; 877 } 878 879 region->vbasedev = vbasedev; 880 region->flags = info->flags; 881 region->size = info->size; 882 region->fd_offset = info->offset; 883 region->nr = index; 884 885 if (region->size) { 886 region->mem = g_new0(MemoryRegion, 1); 887 memory_region_init_io(region->mem, obj, &vfio_region_ops, 888 region, name, region->size); 889 890 if (!vbasedev->no_mmap && 891 region->flags & VFIO_REGION_INFO_FLAG_MMAP) { 892 893 ret = vfio_setup_region_sparse_mmaps(region, info); 894 895 if (ret) { 896 region->nr_mmaps = 1; 897 region->mmaps = g_new0(VFIOMmap, region->nr_mmaps); 898 region->mmaps[0].offset = 0; 899 region->mmaps[0].size = region->size; 900 } 901 } 902 } 903 904 g_free(info); 905 906 trace_vfio_region_setup(vbasedev->name, index, name, 907 region->flags, region->fd_offset, region->size); 908 return 0; 909 } 910 911 int vfio_region_mmap(VFIORegion *region) 912 { 913 int i, prot = 0; 914 char *name; 915 916 if (!region->mem) { 917 return 0; 918 } 919 920 prot |= region->flags & VFIO_REGION_INFO_FLAG_READ ? PROT_READ : 0; 921 prot |= region->flags & VFIO_REGION_INFO_FLAG_WRITE ? PROT_WRITE : 0; 922 923 for (i = 0; i < region->nr_mmaps; i++) { 924 region->mmaps[i].mmap = mmap(NULL, region->mmaps[i].size, prot, 925 MAP_SHARED, region->vbasedev->fd, 926 region->fd_offset + 927 region->mmaps[i].offset); 928 if (region->mmaps[i].mmap == MAP_FAILED) { 929 int ret = -errno; 930 931 trace_vfio_region_mmap_fault(memory_region_name(region->mem), i, 932 region->fd_offset + 933 region->mmaps[i].offset, 934 region->fd_offset + 935 region->mmaps[i].offset + 936 region->mmaps[i].size - 1, ret); 937 938 region->mmaps[i].mmap = NULL; 939 940 for (i--; i >= 0; i--) { 941 memory_region_del_subregion(region->mem, ®ion->mmaps[i].mem); 942 munmap(region->mmaps[i].mmap, region->mmaps[i].size); 943 object_unparent(OBJECT(®ion->mmaps[i].mem)); 944 region->mmaps[i].mmap = NULL; 945 } 946 947 return ret; 948 } 949 950 name = g_strdup_printf("%s mmaps[%d]", 951 memory_region_name(region->mem), i); 952 memory_region_init_ram_device_ptr(®ion->mmaps[i].mem, 953 memory_region_owner(region->mem), 954 name, region->mmaps[i].size, 955 region->mmaps[i].mmap); 956 g_free(name); 957 memory_region_add_subregion(region->mem, region->mmaps[i].offset, 958 ®ion->mmaps[i].mem); 959 960 trace_vfio_region_mmap(memory_region_name(®ion->mmaps[i].mem), 961 region->mmaps[i].offset, 962 region->mmaps[i].offset + 963 region->mmaps[i].size - 1); 964 } 965 966 return 0; 967 } 968 969 void vfio_region_exit(VFIORegion *region) 970 { 971 int i; 972 973 if (!region->mem) { 974 return; 975 } 976 977 for (i = 0; i < region->nr_mmaps; i++) { 978 if (region->mmaps[i].mmap) { 979 memory_region_del_subregion(region->mem, ®ion->mmaps[i].mem); 980 } 981 } 982 983 trace_vfio_region_exit(region->vbasedev->name, region->nr); 984 } 985 986 void vfio_region_finalize(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 munmap(region->mmaps[i].mmap, region->mmaps[i].size); 997 object_unparent(OBJECT(®ion->mmaps[i].mem)); 998 } 999 } 1000 1001 object_unparent(OBJECT(region->mem)); 1002 1003 g_free(region->mem); 1004 g_free(region->mmaps); 1005 1006 trace_vfio_region_finalize(region->vbasedev->name, region->nr); 1007 1008 region->mem = NULL; 1009 region->mmaps = NULL; 1010 region->nr_mmaps = 0; 1011 region->size = 0; 1012 region->flags = 0; 1013 region->nr = 0; 1014 } 1015 1016 void vfio_region_mmaps_set_enabled(VFIORegion *region, bool enabled) 1017 { 1018 int i; 1019 1020 if (!region->mem) { 1021 return; 1022 } 1023 1024 for (i = 0; i < region->nr_mmaps; i++) { 1025 if (region->mmaps[i].mmap) { 1026 memory_region_set_enabled(®ion->mmaps[i].mem, enabled); 1027 } 1028 } 1029 1030 trace_vfio_region_mmaps_set_enabled(memory_region_name(region->mem), 1031 enabled); 1032 } 1033 1034 void vfio_reset_handler(void *opaque) 1035 { 1036 VFIOGroup *group; 1037 VFIODevice *vbasedev; 1038 1039 QLIST_FOREACH(group, &vfio_group_list, next) { 1040 QLIST_FOREACH(vbasedev, &group->device_list, next) { 1041 if (vbasedev->dev->realized) { 1042 vbasedev->ops->vfio_compute_needs_reset(vbasedev); 1043 } 1044 } 1045 } 1046 1047 QLIST_FOREACH(group, &vfio_group_list, next) { 1048 QLIST_FOREACH(vbasedev, &group->device_list, next) { 1049 if (vbasedev->dev->realized && vbasedev->needs_reset) { 1050 vbasedev->ops->vfio_hot_reset_multi(vbasedev); 1051 } 1052 } 1053 } 1054 } 1055 1056 static void vfio_kvm_device_add_group(VFIOGroup *group) 1057 { 1058 #ifdef CONFIG_KVM 1059 struct kvm_device_attr attr = { 1060 .group = KVM_DEV_VFIO_GROUP, 1061 .attr = KVM_DEV_VFIO_GROUP_ADD, 1062 .addr = (uint64_t)(unsigned long)&group->fd, 1063 }; 1064 1065 if (!kvm_enabled()) { 1066 return; 1067 } 1068 1069 if (vfio_kvm_device_fd < 0) { 1070 struct kvm_create_device cd = { 1071 .type = KVM_DEV_TYPE_VFIO, 1072 }; 1073 1074 if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) { 1075 error_report("Failed to create KVM VFIO device: %m"); 1076 return; 1077 } 1078 1079 vfio_kvm_device_fd = cd.fd; 1080 } 1081 1082 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 1083 error_report("Failed to add group %d to KVM VFIO device: %m", 1084 group->groupid); 1085 } 1086 #endif 1087 } 1088 1089 static void vfio_kvm_device_del_group(VFIOGroup *group) 1090 { 1091 #ifdef CONFIG_KVM 1092 struct kvm_device_attr attr = { 1093 .group = KVM_DEV_VFIO_GROUP, 1094 .attr = KVM_DEV_VFIO_GROUP_DEL, 1095 .addr = (uint64_t)(unsigned long)&group->fd, 1096 }; 1097 1098 if (vfio_kvm_device_fd < 0) { 1099 return; 1100 } 1101 1102 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 1103 error_report("Failed to remove group %d from KVM VFIO device: %m", 1104 group->groupid); 1105 } 1106 #endif 1107 } 1108 1109 static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as) 1110 { 1111 VFIOAddressSpace *space; 1112 1113 QLIST_FOREACH(space, &vfio_address_spaces, list) { 1114 if (space->as == as) { 1115 return space; 1116 } 1117 } 1118 1119 /* No suitable VFIOAddressSpace, create a new one */ 1120 space = g_malloc0(sizeof(*space)); 1121 space->as = as; 1122 QLIST_INIT(&space->containers); 1123 1124 QLIST_INSERT_HEAD(&vfio_address_spaces, space, list); 1125 1126 return space; 1127 } 1128 1129 static void vfio_put_address_space(VFIOAddressSpace *space) 1130 { 1131 if (QLIST_EMPTY(&space->containers)) { 1132 QLIST_REMOVE(space, list); 1133 g_free(space); 1134 } 1135 } 1136 1137 /* 1138 * vfio_get_iommu_type - selects the richest iommu_type (v2 first) 1139 */ 1140 static int vfio_get_iommu_type(VFIOContainer *container, 1141 Error **errp) 1142 { 1143 int iommu_types[] = { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU, 1144 VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU }; 1145 int i; 1146 1147 for (i = 0; i < ARRAY_SIZE(iommu_types); i++) { 1148 if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) { 1149 return iommu_types[i]; 1150 } 1151 } 1152 error_setg(errp, "No available IOMMU models"); 1153 return -EINVAL; 1154 } 1155 1156 static int vfio_init_container(VFIOContainer *container, int group_fd, 1157 Error **errp) 1158 { 1159 int iommu_type, ret; 1160 1161 iommu_type = vfio_get_iommu_type(container, errp); 1162 if (iommu_type < 0) { 1163 return iommu_type; 1164 } 1165 1166 ret = ioctl(group_fd, VFIO_GROUP_SET_CONTAINER, &container->fd); 1167 if (ret) { 1168 error_setg_errno(errp, errno, "Failed to set group container"); 1169 return -errno; 1170 } 1171 1172 while (ioctl(container->fd, VFIO_SET_IOMMU, iommu_type)) { 1173 if (iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 1174 /* 1175 * On sPAPR, despite the IOMMU subdriver always advertises v1 and 1176 * v2, the running platform may not support v2 and there is no 1177 * way to guess it until an IOMMU group gets added to the container. 1178 * So in case it fails with v2, try v1 as a fallback. 1179 */ 1180 iommu_type = VFIO_SPAPR_TCE_IOMMU; 1181 continue; 1182 } 1183 error_setg_errno(errp, errno, "Failed to set iommu for container"); 1184 return -errno; 1185 } 1186 1187 container->iommu_type = iommu_type; 1188 return 0; 1189 } 1190 1191 static int vfio_connect_container(VFIOGroup *group, AddressSpace *as, 1192 Error **errp) 1193 { 1194 VFIOContainer *container; 1195 int ret, fd; 1196 VFIOAddressSpace *space; 1197 1198 space = vfio_get_address_space(as); 1199 1200 /* 1201 * VFIO is currently incompatible with memory ballooning insofar as the 1202 * madvise to purge (zap) the page from QEMU's address space does not 1203 * interact with the memory API and therefore leaves stale virtual to 1204 * physical mappings in the IOMMU if the page was previously pinned. We 1205 * therefore add a balloon inhibit for each group added to a container, 1206 * whether the container is used individually or shared. This provides 1207 * us with options to allow devices within a group to opt-in and allow 1208 * ballooning, so long as it is done consistently for a group (for instance 1209 * if the device is an mdev device where it is known that the host vendor 1210 * driver will never pin pages outside of the working set of the guest 1211 * driver, which would thus not be ballooning candidates). 1212 * 1213 * The first opportunity to induce pinning occurs here where we attempt to 1214 * attach the group to existing containers within the AddressSpace. If any 1215 * pages are already zapped from the virtual address space, such as from a 1216 * previous ballooning opt-in, new pinning will cause valid mappings to be 1217 * re-established. Likewise, when the overall MemoryListener for a new 1218 * container is registered, a replay of mappings within the AddressSpace 1219 * will occur, re-establishing any previously zapped pages as well. 1220 * 1221 * NB. Balloon inhibiting does not currently block operation of the 1222 * balloon driver or revoke previously pinned pages, it only prevents 1223 * calling madvise to modify the virtual mapping of ballooned pages. 1224 */ 1225 qemu_balloon_inhibit(true); 1226 1227 QLIST_FOREACH(container, &space->containers, next) { 1228 if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) { 1229 group->container = container; 1230 QLIST_INSERT_HEAD(&container->group_list, group, container_next); 1231 vfio_kvm_device_add_group(group); 1232 return 0; 1233 } 1234 } 1235 1236 fd = qemu_open("/dev/vfio/vfio", O_RDWR); 1237 if (fd < 0) { 1238 error_setg_errno(errp, errno, "failed to open /dev/vfio/vfio"); 1239 ret = -errno; 1240 goto put_space_exit; 1241 } 1242 1243 ret = ioctl(fd, VFIO_GET_API_VERSION); 1244 if (ret != VFIO_API_VERSION) { 1245 error_setg(errp, "supported vfio version: %d, " 1246 "reported version: %d", VFIO_API_VERSION, ret); 1247 ret = -EINVAL; 1248 goto close_fd_exit; 1249 } 1250 1251 container = g_malloc0(sizeof(*container)); 1252 container->space = space; 1253 container->fd = fd; 1254 QLIST_INIT(&container->giommu_list); 1255 QLIST_INIT(&container->hostwin_list); 1256 1257 ret = vfio_init_container(container, group->fd, errp); 1258 if (ret) { 1259 goto free_container_exit; 1260 } 1261 1262 switch (container->iommu_type) { 1263 case VFIO_TYPE1v2_IOMMU: 1264 case VFIO_TYPE1_IOMMU: 1265 { 1266 struct vfio_iommu_type1_info info; 1267 1268 /* 1269 * FIXME: This assumes that a Type1 IOMMU can map any 64-bit 1270 * IOVA whatsoever. That's not actually true, but the current 1271 * kernel interface doesn't tell us what it can map, and the 1272 * existing Type1 IOMMUs generally support any IOVA we're 1273 * going to actually try in practice. 1274 */ 1275 info.argsz = sizeof(info); 1276 ret = ioctl(fd, VFIO_IOMMU_GET_INFO, &info); 1277 /* Ignore errors */ 1278 if (ret || !(info.flags & VFIO_IOMMU_INFO_PGSIZES)) { 1279 /* Assume 4k IOVA page size */ 1280 info.iova_pgsizes = 4096; 1281 } 1282 vfio_host_win_add(container, 0, (hwaddr)-1, info.iova_pgsizes); 1283 container->pgsizes = info.iova_pgsizes; 1284 break; 1285 } 1286 case VFIO_SPAPR_TCE_v2_IOMMU: 1287 case VFIO_SPAPR_TCE_IOMMU: 1288 { 1289 struct vfio_iommu_spapr_tce_info info; 1290 bool v2 = container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU; 1291 1292 /* 1293 * The host kernel code implementing VFIO_IOMMU_DISABLE is called 1294 * when container fd is closed so we do not call it explicitly 1295 * in this file. 1296 */ 1297 if (!v2) { 1298 ret = ioctl(fd, VFIO_IOMMU_ENABLE); 1299 if (ret) { 1300 error_setg_errno(errp, errno, "failed to enable container"); 1301 ret = -errno; 1302 goto free_container_exit; 1303 } 1304 } else { 1305 container->prereg_listener = vfio_prereg_listener; 1306 1307 memory_listener_register(&container->prereg_listener, 1308 &address_space_memory); 1309 if (container->error) { 1310 memory_listener_unregister(&container->prereg_listener); 1311 ret = container->error; 1312 error_setg(errp, 1313 "RAM memory listener initialization failed for container"); 1314 goto free_container_exit; 1315 } 1316 } 1317 1318 info.argsz = sizeof(info); 1319 ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info); 1320 if (ret) { 1321 error_setg_errno(errp, errno, 1322 "VFIO_IOMMU_SPAPR_TCE_GET_INFO failed"); 1323 ret = -errno; 1324 if (v2) { 1325 memory_listener_unregister(&container->prereg_listener); 1326 } 1327 goto free_container_exit; 1328 } 1329 1330 if (v2) { 1331 container->pgsizes = info.ddw.pgsizes; 1332 /* 1333 * There is a default window in just created container. 1334 * To make region_add/del simpler, we better remove this 1335 * window now and let those iommu_listener callbacks 1336 * create/remove them when needed. 1337 */ 1338 ret = vfio_spapr_remove_window(container, info.dma32_window_start); 1339 if (ret) { 1340 error_setg_errno(errp, -ret, 1341 "failed to remove existing window"); 1342 goto free_container_exit; 1343 } 1344 } else { 1345 /* The default table uses 4K pages */ 1346 container->pgsizes = 0x1000; 1347 vfio_host_win_add(container, info.dma32_window_start, 1348 info.dma32_window_start + 1349 info.dma32_window_size - 1, 1350 0x1000); 1351 } 1352 } 1353 } 1354 1355 vfio_kvm_device_add_group(group); 1356 1357 QLIST_INIT(&container->group_list); 1358 QLIST_INSERT_HEAD(&space->containers, container, next); 1359 1360 group->container = container; 1361 QLIST_INSERT_HEAD(&container->group_list, group, container_next); 1362 1363 container->listener = vfio_memory_listener; 1364 1365 memory_listener_register(&container->listener, container->space->as); 1366 1367 if (container->error) { 1368 ret = container->error; 1369 error_setg_errno(errp, -ret, 1370 "memory listener initialization failed for container"); 1371 goto listener_release_exit; 1372 } 1373 1374 container->initialized = true; 1375 1376 return 0; 1377 listener_release_exit: 1378 QLIST_REMOVE(group, container_next); 1379 QLIST_REMOVE(container, next); 1380 vfio_kvm_device_del_group(group); 1381 vfio_listener_release(container); 1382 1383 free_container_exit: 1384 g_free(container); 1385 1386 close_fd_exit: 1387 close(fd); 1388 1389 put_space_exit: 1390 qemu_balloon_inhibit(false); 1391 vfio_put_address_space(space); 1392 1393 return ret; 1394 } 1395 1396 static void vfio_disconnect_container(VFIOGroup *group) 1397 { 1398 VFIOContainer *container = group->container; 1399 1400 QLIST_REMOVE(group, container_next); 1401 group->container = NULL; 1402 1403 /* 1404 * Explicitly release the listener first before unset container, 1405 * since unset may destroy the backend container if it's the last 1406 * group. 1407 */ 1408 if (QLIST_EMPTY(&container->group_list)) { 1409 vfio_listener_release(container); 1410 } 1411 1412 if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) { 1413 error_report("vfio: error disconnecting group %d from container", 1414 group->groupid); 1415 } 1416 1417 if (QLIST_EMPTY(&container->group_list)) { 1418 VFIOAddressSpace *space = container->space; 1419 VFIOGuestIOMMU *giommu, *tmp; 1420 1421 QLIST_REMOVE(container, next); 1422 1423 QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) { 1424 memory_region_unregister_iommu_notifier( 1425 MEMORY_REGION(giommu->iommu), &giommu->n); 1426 QLIST_REMOVE(giommu, giommu_next); 1427 g_free(giommu); 1428 } 1429 1430 trace_vfio_disconnect_container(container->fd); 1431 close(container->fd); 1432 g_free(container); 1433 1434 vfio_put_address_space(space); 1435 } 1436 } 1437 1438 VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp) 1439 { 1440 VFIOGroup *group; 1441 char path[32]; 1442 struct vfio_group_status status = { .argsz = sizeof(status) }; 1443 1444 QLIST_FOREACH(group, &vfio_group_list, next) { 1445 if (group->groupid == groupid) { 1446 /* Found it. Now is it already in the right context? */ 1447 if (group->container->space->as == as) { 1448 return group; 1449 } else { 1450 error_setg(errp, "group %d used in multiple address spaces", 1451 group->groupid); 1452 return NULL; 1453 } 1454 } 1455 } 1456 1457 group = g_malloc0(sizeof(*group)); 1458 1459 snprintf(path, sizeof(path), "/dev/vfio/%d", groupid); 1460 group->fd = qemu_open(path, O_RDWR); 1461 if (group->fd < 0) { 1462 error_setg_errno(errp, errno, "failed to open %s", path); 1463 goto free_group_exit; 1464 } 1465 1466 if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) { 1467 error_setg_errno(errp, errno, "failed to get group %d status", groupid); 1468 goto close_fd_exit; 1469 } 1470 1471 if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) { 1472 error_setg(errp, "group %d is not viable", groupid); 1473 error_append_hint(errp, 1474 "Please ensure all devices within the iommu_group " 1475 "are bound to their vfio bus driver.\n"); 1476 goto close_fd_exit; 1477 } 1478 1479 group->groupid = groupid; 1480 QLIST_INIT(&group->device_list); 1481 1482 if (vfio_connect_container(group, as, errp)) { 1483 error_prepend(errp, "failed to setup container for group %d: ", 1484 groupid); 1485 goto close_fd_exit; 1486 } 1487 1488 if (QLIST_EMPTY(&vfio_group_list)) { 1489 qemu_register_reset(vfio_reset_handler, NULL); 1490 } 1491 1492 QLIST_INSERT_HEAD(&vfio_group_list, group, next); 1493 1494 return group; 1495 1496 close_fd_exit: 1497 close(group->fd); 1498 1499 free_group_exit: 1500 g_free(group); 1501 1502 return NULL; 1503 } 1504 1505 void vfio_put_group(VFIOGroup *group) 1506 { 1507 if (!group || !QLIST_EMPTY(&group->device_list)) { 1508 return; 1509 } 1510 1511 if (!group->balloon_allowed) { 1512 qemu_balloon_inhibit(false); 1513 } 1514 vfio_kvm_device_del_group(group); 1515 vfio_disconnect_container(group); 1516 QLIST_REMOVE(group, next); 1517 trace_vfio_put_group(group->fd); 1518 close(group->fd); 1519 g_free(group); 1520 1521 if (QLIST_EMPTY(&vfio_group_list)) { 1522 qemu_unregister_reset(vfio_reset_handler, NULL); 1523 } 1524 } 1525 1526 int vfio_get_device(VFIOGroup *group, const char *name, 1527 VFIODevice *vbasedev, Error **errp) 1528 { 1529 struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) }; 1530 int ret, fd; 1531 1532 fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name); 1533 if (fd < 0) { 1534 error_setg_errno(errp, errno, "error getting device from group %d", 1535 group->groupid); 1536 error_append_hint(errp, 1537 "Verify all devices in group %d are bound to vfio-<bus> " 1538 "or pci-stub and not already in use\n", group->groupid); 1539 return fd; 1540 } 1541 1542 ret = ioctl(fd, VFIO_DEVICE_GET_INFO, &dev_info); 1543 if (ret) { 1544 error_setg_errno(errp, errno, "error getting device info"); 1545 close(fd); 1546 return ret; 1547 } 1548 1549 /* 1550 * Clear the balloon inhibitor for this group if the driver knows the 1551 * device operates compatibly with ballooning. Setting must be consistent 1552 * per group, but since compatibility is really only possible with mdev 1553 * currently, we expect singleton groups. 1554 */ 1555 if (vbasedev->balloon_allowed != group->balloon_allowed) { 1556 if (!QLIST_EMPTY(&group->device_list)) { 1557 error_setg(errp, 1558 "Inconsistent device balloon setting within group"); 1559 close(fd); 1560 return -1; 1561 } 1562 1563 if (!group->balloon_allowed) { 1564 group->balloon_allowed = true; 1565 qemu_balloon_inhibit(false); 1566 } 1567 } 1568 1569 vbasedev->fd = fd; 1570 vbasedev->group = group; 1571 QLIST_INSERT_HEAD(&group->device_list, vbasedev, next); 1572 1573 vbasedev->num_irqs = dev_info.num_irqs; 1574 vbasedev->num_regions = dev_info.num_regions; 1575 vbasedev->flags = dev_info.flags; 1576 1577 trace_vfio_get_device(name, dev_info.flags, dev_info.num_regions, 1578 dev_info.num_irqs); 1579 1580 vbasedev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET); 1581 return 0; 1582 } 1583 1584 void vfio_put_base_device(VFIODevice *vbasedev) 1585 { 1586 if (!vbasedev->group) { 1587 return; 1588 } 1589 QLIST_REMOVE(vbasedev, next); 1590 vbasedev->group = NULL; 1591 trace_vfio_put_base_device(vbasedev->fd); 1592 close(vbasedev->fd); 1593 } 1594 1595 int vfio_get_region_info(VFIODevice *vbasedev, int index, 1596 struct vfio_region_info **info) 1597 { 1598 size_t argsz = sizeof(struct vfio_region_info); 1599 1600 *info = g_malloc0(argsz); 1601 1602 (*info)->index = index; 1603 retry: 1604 (*info)->argsz = argsz; 1605 1606 if (ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, *info)) { 1607 g_free(*info); 1608 *info = NULL; 1609 return -errno; 1610 } 1611 1612 if ((*info)->argsz > argsz) { 1613 argsz = (*info)->argsz; 1614 *info = g_realloc(*info, argsz); 1615 1616 goto retry; 1617 } 1618 1619 return 0; 1620 } 1621 1622 int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t type, 1623 uint32_t subtype, struct vfio_region_info **info) 1624 { 1625 int i; 1626 1627 for (i = 0; i < vbasedev->num_regions; i++) { 1628 struct vfio_info_cap_header *hdr; 1629 struct vfio_region_info_cap_type *cap_type; 1630 1631 if (vfio_get_region_info(vbasedev, i, info)) { 1632 continue; 1633 } 1634 1635 hdr = vfio_get_region_info_cap(*info, VFIO_REGION_INFO_CAP_TYPE); 1636 if (!hdr) { 1637 g_free(*info); 1638 continue; 1639 } 1640 1641 cap_type = container_of(hdr, struct vfio_region_info_cap_type, header); 1642 1643 trace_vfio_get_dev_region(vbasedev->name, i, 1644 cap_type->type, cap_type->subtype); 1645 1646 if (cap_type->type == type && cap_type->subtype == subtype) { 1647 return 0; 1648 } 1649 1650 g_free(*info); 1651 } 1652 1653 *info = NULL; 1654 return -ENODEV; 1655 } 1656 1657 bool vfio_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_type) 1658 { 1659 struct vfio_region_info *info = NULL; 1660 bool ret = false; 1661 1662 if (!vfio_get_region_info(vbasedev, region, &info)) { 1663 if (vfio_get_region_info_cap(info, cap_type)) { 1664 ret = true; 1665 } 1666 g_free(info); 1667 } 1668 1669 return ret; 1670 } 1671 1672 /* 1673 * Interfaces for IBM EEH (Enhanced Error Handling) 1674 */ 1675 static bool vfio_eeh_container_ok(VFIOContainer *container) 1676 { 1677 /* 1678 * As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO 1679 * implementation is broken if there are multiple groups in a 1680 * container. The hardware works in units of Partitionable 1681 * Endpoints (== IOMMU groups) and the EEH operations naively 1682 * iterate across all groups in the container, without any logic 1683 * to make sure the groups have their state synchronized. For 1684 * certain operations (ENABLE) that might be ok, until an error 1685 * occurs, but for others (GET_STATE) it's clearly broken. 1686 */ 1687 1688 /* 1689 * XXX Once fixed kernels exist, test for them here 1690 */ 1691 1692 if (QLIST_EMPTY(&container->group_list)) { 1693 return false; 1694 } 1695 1696 if (QLIST_NEXT(QLIST_FIRST(&container->group_list), container_next)) { 1697 return false; 1698 } 1699 1700 return true; 1701 } 1702 1703 static int vfio_eeh_container_op(VFIOContainer *container, uint32_t op) 1704 { 1705 struct vfio_eeh_pe_op pe_op = { 1706 .argsz = sizeof(pe_op), 1707 .op = op, 1708 }; 1709 int ret; 1710 1711 if (!vfio_eeh_container_ok(container)) { 1712 error_report("vfio/eeh: EEH_PE_OP 0x%x: " 1713 "kernel requires a container with exactly one group", op); 1714 return -EPERM; 1715 } 1716 1717 ret = ioctl(container->fd, VFIO_EEH_PE_OP, &pe_op); 1718 if (ret < 0) { 1719 error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op); 1720 return -errno; 1721 } 1722 1723 return ret; 1724 } 1725 1726 static VFIOContainer *vfio_eeh_as_container(AddressSpace *as) 1727 { 1728 VFIOAddressSpace *space = vfio_get_address_space(as); 1729 VFIOContainer *container = NULL; 1730 1731 if (QLIST_EMPTY(&space->containers)) { 1732 /* No containers to act on */ 1733 goto out; 1734 } 1735 1736 container = QLIST_FIRST(&space->containers); 1737 1738 if (QLIST_NEXT(container, next)) { 1739 /* We don't yet have logic to synchronize EEH state across 1740 * multiple containers */ 1741 container = NULL; 1742 goto out; 1743 } 1744 1745 out: 1746 vfio_put_address_space(space); 1747 return container; 1748 } 1749 1750 bool vfio_eeh_as_ok(AddressSpace *as) 1751 { 1752 VFIOContainer *container = vfio_eeh_as_container(as); 1753 1754 return (container != NULL) && vfio_eeh_container_ok(container); 1755 } 1756 1757 int vfio_eeh_as_op(AddressSpace *as, uint32_t op) 1758 { 1759 VFIOContainer *container = vfio_eeh_as_container(as); 1760 1761 if (!container) { 1762 return -ENODEV; 1763 } 1764 return vfio_eeh_container_op(container, op); 1765 } 1766