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/kvm.h" 37 #include "sysemu/reset.h" 38 #include "trace.h" 39 #include "qapi/error.h" 40 41 VFIOGroupList vfio_group_list = 42 QLIST_HEAD_INITIALIZER(vfio_group_list); 43 static QLIST_HEAD(, VFIOAddressSpace) vfio_address_spaces = 44 QLIST_HEAD_INITIALIZER(vfio_address_spaces); 45 46 #ifdef CONFIG_KVM 47 /* 48 * We have a single VFIO pseudo device per KVM VM. Once created it lives 49 * for the life of the VM. Closing the file descriptor only drops our 50 * reference to it and the device's reference to kvm. Therefore once 51 * initialized, this file descriptor is only released on QEMU exit and 52 * we'll re-use it should another vfio device be attached before then. 53 */ 54 static int vfio_kvm_device_fd = -1; 55 #endif 56 57 /* 58 * Common VFIO interrupt disable 59 */ 60 void vfio_disable_irqindex(VFIODevice *vbasedev, int index) 61 { 62 struct vfio_irq_set irq_set = { 63 .argsz = sizeof(irq_set), 64 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER, 65 .index = index, 66 .start = 0, 67 .count = 0, 68 }; 69 70 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 71 } 72 73 void vfio_unmask_single_irqindex(VFIODevice *vbasedev, int index) 74 { 75 struct vfio_irq_set irq_set = { 76 .argsz = sizeof(irq_set), 77 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK, 78 .index = index, 79 .start = 0, 80 .count = 1, 81 }; 82 83 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 84 } 85 86 void vfio_mask_single_irqindex(VFIODevice *vbasedev, int index) 87 { 88 struct vfio_irq_set irq_set = { 89 .argsz = sizeof(irq_set), 90 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK, 91 .index = index, 92 .start = 0, 93 .count = 1, 94 }; 95 96 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 97 } 98 99 static inline const char *action_to_str(int action) 100 { 101 switch (action) { 102 case VFIO_IRQ_SET_ACTION_MASK: 103 return "MASK"; 104 case VFIO_IRQ_SET_ACTION_UNMASK: 105 return "UNMASK"; 106 case VFIO_IRQ_SET_ACTION_TRIGGER: 107 return "TRIGGER"; 108 default: 109 return "UNKNOWN ACTION"; 110 } 111 } 112 113 static const char *index_to_str(VFIODevice *vbasedev, int index) 114 { 115 if (vbasedev->type != VFIO_DEVICE_TYPE_PCI) { 116 return NULL; 117 } 118 119 switch (index) { 120 case VFIO_PCI_INTX_IRQ_INDEX: 121 return "INTX"; 122 case VFIO_PCI_MSI_IRQ_INDEX: 123 return "MSI"; 124 case VFIO_PCI_MSIX_IRQ_INDEX: 125 return "MSIX"; 126 case VFIO_PCI_ERR_IRQ_INDEX: 127 return "ERR"; 128 case VFIO_PCI_REQ_IRQ_INDEX: 129 return "REQ"; 130 default: 131 return NULL; 132 } 133 } 134 135 int vfio_set_irq_signaling(VFIODevice *vbasedev, int index, int subindex, 136 int action, int fd, Error **errp) 137 { 138 struct vfio_irq_set *irq_set; 139 int argsz, ret = 0; 140 const char *name; 141 int32_t *pfd; 142 143 argsz = sizeof(*irq_set) + sizeof(*pfd); 144 145 irq_set = g_malloc0(argsz); 146 irq_set->argsz = argsz; 147 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | action; 148 irq_set->index = index; 149 irq_set->start = subindex; 150 irq_set->count = 1; 151 pfd = (int32_t *)&irq_set->data; 152 *pfd = fd; 153 154 if (ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, irq_set)) { 155 ret = -errno; 156 } 157 g_free(irq_set); 158 159 if (!ret) { 160 return 0; 161 } 162 163 error_setg_errno(errp, -ret, "VFIO_DEVICE_SET_IRQS failure"); 164 165 name = index_to_str(vbasedev, index); 166 if (name) { 167 error_prepend(errp, "%s-%d: ", name, subindex); 168 } else { 169 error_prepend(errp, "index %d-%d: ", index, subindex); 170 } 171 error_prepend(errp, 172 "Failed to %s %s eventfd signaling for interrupt ", 173 fd < 0 ? "tear down" : "set up", action_to_str(action)); 174 return ret; 175 } 176 177 /* 178 * IO Port/MMIO - Beware of the endians, VFIO is always little endian 179 */ 180 void vfio_region_write(void *opaque, hwaddr addr, 181 uint64_t data, unsigned size) 182 { 183 VFIORegion *region = opaque; 184 VFIODevice *vbasedev = region->vbasedev; 185 union { 186 uint8_t byte; 187 uint16_t word; 188 uint32_t dword; 189 uint64_t qword; 190 } buf; 191 192 switch (size) { 193 case 1: 194 buf.byte = data; 195 break; 196 case 2: 197 buf.word = cpu_to_le16(data); 198 break; 199 case 4: 200 buf.dword = cpu_to_le32(data); 201 break; 202 case 8: 203 buf.qword = cpu_to_le64(data); 204 break; 205 default: 206 hw_error("vfio: unsupported write size, %d bytes", size); 207 break; 208 } 209 210 if (pwrite(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) { 211 error_report("%s(%s:region%d+0x%"HWADDR_PRIx", 0x%"PRIx64 212 ",%d) failed: %m", 213 __func__, vbasedev->name, region->nr, 214 addr, data, size); 215 } 216 217 trace_vfio_region_write(vbasedev->name, region->nr, addr, data, size); 218 219 /* 220 * A read or write to a BAR always signals an INTx EOI. This will 221 * do nothing if not pending (including not in INTx mode). We assume 222 * that a BAR access is in response to an interrupt and that BAR 223 * accesses will service the interrupt. Unfortunately, we don't know 224 * which access will service the interrupt, so we're potentially 225 * getting quite a few host interrupts per guest interrupt. 226 */ 227 vbasedev->ops->vfio_eoi(vbasedev); 228 } 229 230 uint64_t vfio_region_read(void *opaque, 231 hwaddr addr, unsigned size) 232 { 233 VFIORegion *region = opaque; 234 VFIODevice *vbasedev = region->vbasedev; 235 union { 236 uint8_t byte; 237 uint16_t word; 238 uint32_t dword; 239 uint64_t qword; 240 } buf; 241 uint64_t data = 0; 242 243 if (pread(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) { 244 error_report("%s(%s:region%d+0x%"HWADDR_PRIx", %d) failed: %m", 245 __func__, vbasedev->name, region->nr, 246 addr, size); 247 return (uint64_t)-1; 248 } 249 switch (size) { 250 case 1: 251 data = buf.byte; 252 break; 253 case 2: 254 data = le16_to_cpu(buf.word); 255 break; 256 case 4: 257 data = le32_to_cpu(buf.dword); 258 break; 259 case 8: 260 data = le64_to_cpu(buf.qword); 261 break; 262 default: 263 hw_error("vfio: unsupported read size, %d bytes", size); 264 break; 265 } 266 267 trace_vfio_region_read(vbasedev->name, region->nr, addr, size, data); 268 269 /* Same as write above */ 270 vbasedev->ops->vfio_eoi(vbasedev); 271 272 return data; 273 } 274 275 const MemoryRegionOps vfio_region_ops = { 276 .read = vfio_region_read, 277 .write = vfio_region_write, 278 .endianness = DEVICE_LITTLE_ENDIAN, 279 .valid = { 280 .min_access_size = 1, 281 .max_access_size = 8, 282 }, 283 .impl = { 284 .min_access_size = 1, 285 .max_access_size = 8, 286 }, 287 }; 288 289 /* 290 * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86 291 */ 292 static int vfio_dma_unmap(VFIOContainer *container, 293 hwaddr iova, ram_addr_t size) 294 { 295 struct vfio_iommu_type1_dma_unmap unmap = { 296 .argsz = sizeof(unmap), 297 .flags = 0, 298 .iova = iova, 299 .size = size, 300 }; 301 302 while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) { 303 /* 304 * The type1 backend has an off-by-one bug in the kernel (71a7d3d78e3c 305 * v4.15) where an overflow in its wrap-around check prevents us from 306 * unmapping the last page of the address space. Test for the error 307 * condition and re-try the unmap excluding the last page. The 308 * expectation is that we've never mapped the last page anyway and this 309 * unmap request comes via vIOMMU support which also makes it unlikely 310 * that this page is used. This bug was introduced well after type1 v2 311 * support was introduced, so we shouldn't need to test for v1. A fix 312 * is queued for kernel v5.0 so this workaround can be removed once 313 * affected kernels are sufficiently deprecated. 314 */ 315 if (errno == EINVAL && unmap.size && !(unmap.iova + unmap.size) && 316 container->iommu_type == VFIO_TYPE1v2_IOMMU) { 317 trace_vfio_dma_unmap_overflow_workaround(); 318 unmap.size -= 1ULL << ctz64(container->pgsizes); 319 continue; 320 } 321 error_report("VFIO_UNMAP_DMA failed: %s", strerror(errno)); 322 return -errno; 323 } 324 325 return 0; 326 } 327 328 static int vfio_dma_map(VFIOContainer *container, hwaddr iova, 329 ram_addr_t size, void *vaddr, bool readonly) 330 { 331 struct vfio_iommu_type1_dma_map map = { 332 .argsz = sizeof(map), 333 .flags = VFIO_DMA_MAP_FLAG_READ, 334 .vaddr = (__u64)(uintptr_t)vaddr, 335 .iova = iova, 336 .size = size, 337 }; 338 339 if (!readonly) { 340 map.flags |= VFIO_DMA_MAP_FLAG_WRITE; 341 } 342 343 /* 344 * Try the mapping, if it fails with EBUSY, unmap the region and try 345 * again. This shouldn't be necessary, but we sometimes see it in 346 * the VGA ROM space. 347 */ 348 if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 || 349 (errno == EBUSY && vfio_dma_unmap(container, iova, size) == 0 && 350 ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) { 351 return 0; 352 } 353 354 error_report("VFIO_MAP_DMA failed: %s", strerror(errno)); 355 return -errno; 356 } 357 358 static void vfio_host_win_add(VFIOContainer *container, 359 hwaddr min_iova, hwaddr max_iova, 360 uint64_t iova_pgsizes) 361 { 362 VFIOHostDMAWindow *hostwin; 363 364 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 365 if (ranges_overlap(hostwin->min_iova, 366 hostwin->max_iova - hostwin->min_iova + 1, 367 min_iova, 368 max_iova - min_iova + 1)) { 369 hw_error("%s: Overlapped IOMMU are not enabled", __func__); 370 } 371 } 372 373 hostwin = g_malloc0(sizeof(*hostwin)); 374 375 hostwin->min_iova = min_iova; 376 hostwin->max_iova = max_iova; 377 hostwin->iova_pgsizes = iova_pgsizes; 378 QLIST_INSERT_HEAD(&container->hostwin_list, hostwin, hostwin_next); 379 } 380 381 static int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova, 382 hwaddr max_iova) 383 { 384 VFIOHostDMAWindow *hostwin; 385 386 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 387 if (hostwin->min_iova == min_iova && hostwin->max_iova == max_iova) { 388 QLIST_REMOVE(hostwin, hostwin_next); 389 return 0; 390 } 391 } 392 393 return -1; 394 } 395 396 static bool vfio_listener_skipped_section(MemoryRegionSection *section) 397 { 398 return (!memory_region_is_ram(section->mr) && 399 !memory_region_is_iommu(section->mr)) || 400 /* 401 * Sizing an enabled 64-bit BAR can cause spurious mappings to 402 * addresses in the upper part of the 64-bit address space. These 403 * are never accessed by the CPU and beyond the address width of 404 * some IOMMU hardware. TODO: VFIO should tell us the IOMMU width. 405 */ 406 section->offset_within_address_space & (1ULL << 63); 407 } 408 409 /* Called with rcu_read_lock held. */ 410 static bool vfio_get_vaddr(IOMMUTLBEntry *iotlb, void **vaddr, 411 bool *read_only) 412 { 413 MemoryRegion *mr; 414 hwaddr xlat; 415 hwaddr len = iotlb->addr_mask + 1; 416 bool writable = iotlb->perm & IOMMU_WO; 417 418 /* 419 * The IOMMU TLB entry we have just covers translation through 420 * this IOMMU to its immediate target. We need to translate 421 * it the rest of the way through to memory. 422 */ 423 mr = address_space_translate(&address_space_memory, 424 iotlb->translated_addr, 425 &xlat, &len, writable, 426 MEMTXATTRS_UNSPECIFIED); 427 if (!memory_region_is_ram(mr)) { 428 error_report("iommu map to non memory area %"HWADDR_PRIx"", 429 xlat); 430 return false; 431 } 432 433 /* 434 * Translation truncates length to the IOMMU page size, 435 * check that it did not truncate too much. 436 */ 437 if (len & iotlb->addr_mask) { 438 error_report("iommu has granularity incompatible with target AS"); 439 return false; 440 } 441 442 *vaddr = memory_region_get_ram_ptr(mr) + xlat; 443 *read_only = !writable || mr->readonly; 444 445 return true; 446 } 447 448 static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) 449 { 450 VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n); 451 VFIOContainer *container = giommu->container; 452 hwaddr iova = iotlb->iova + giommu->iommu_offset; 453 bool read_only; 454 void *vaddr; 455 int ret; 456 457 trace_vfio_iommu_map_notify(iotlb->perm == IOMMU_NONE ? "UNMAP" : "MAP", 458 iova, iova + iotlb->addr_mask); 459 460 if (iotlb->target_as != &address_space_memory) { 461 error_report("Wrong target AS \"%s\", only system memory is allowed", 462 iotlb->target_as->name ? iotlb->target_as->name : "none"); 463 return; 464 } 465 466 rcu_read_lock(); 467 468 if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) { 469 if (!vfio_get_vaddr(iotlb, &vaddr, &read_only)) { 470 goto out; 471 } 472 /* 473 * vaddr is only valid until rcu_read_unlock(). But after 474 * vfio_dma_map has set up the mapping the pages will be 475 * pinned by the kernel. This makes sure that the RAM backend 476 * of vaddr will always be there, even if the memory object is 477 * destroyed and its backing memory munmap-ed. 478 */ 479 ret = vfio_dma_map(container, iova, 480 iotlb->addr_mask + 1, vaddr, 481 read_only); 482 if (ret) { 483 error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", " 484 "0x%"HWADDR_PRIx", %p) = %d (%m)", 485 container, iova, 486 iotlb->addr_mask + 1, vaddr, ret); 487 } 488 } else { 489 ret = vfio_dma_unmap(container, iova, iotlb->addr_mask + 1); 490 if (ret) { 491 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " 492 "0x%"HWADDR_PRIx") = %d (%m)", 493 container, iova, 494 iotlb->addr_mask + 1, ret); 495 } 496 } 497 out: 498 rcu_read_unlock(); 499 } 500 501 static void vfio_listener_region_add(MemoryListener *listener, 502 MemoryRegionSection *section) 503 { 504 VFIOContainer *container = container_of(listener, VFIOContainer, listener); 505 hwaddr iova, end; 506 Int128 llend, llsize; 507 void *vaddr; 508 int ret; 509 VFIOHostDMAWindow *hostwin; 510 bool hostwin_found; 511 Error *err = NULL; 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 error_setg(&err, 547 "region [0x%"PRIx64",0x%"PRIx64"] overlaps with existing" 548 "host DMA window [0x%"PRIx64",0x%"PRIx64"]", 549 section->offset_within_address_space, 550 section->offset_within_address_space + 551 int128_get64(section->size) - 1, 552 hostwin->min_iova, hostwin->max_iova); 553 goto fail; 554 } 555 } 556 557 ret = vfio_spapr_create_window(container, section, &pgsize); 558 if (ret) { 559 error_setg_errno(&err, -ret, "Failed to create SPAPR window"); 560 goto fail; 561 } 562 563 vfio_host_win_add(container, section->offset_within_address_space, 564 section->offset_within_address_space + 565 int128_get64(section->size) - 1, pgsize); 566 #ifdef CONFIG_KVM 567 if (kvm_enabled()) { 568 VFIOGroup *group; 569 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr); 570 struct kvm_vfio_spapr_tce param; 571 struct kvm_device_attr attr = { 572 .group = KVM_DEV_VFIO_GROUP, 573 .attr = KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE, 574 .addr = (uint64_t)(unsigned long)¶m, 575 }; 576 577 if (!memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_SPAPR_TCE_FD, 578 ¶m.tablefd)) { 579 QLIST_FOREACH(group, &container->group_list, container_next) { 580 param.groupfd = group->fd; 581 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 582 error_report("vfio: failed to setup fd %d " 583 "for a group with fd %d: %s", 584 param.tablefd, param.groupfd, 585 strerror(errno)); 586 return; 587 } 588 trace_vfio_spapr_group_attach(param.groupfd, param.tablefd); 589 } 590 } 591 } 592 #endif 593 } 594 595 hostwin_found = false; 596 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 597 if (hostwin->min_iova <= iova && end <= hostwin->max_iova) { 598 hostwin_found = true; 599 break; 600 } 601 } 602 603 if (!hostwin_found) { 604 error_setg(&err, "Container %p can't map guest IOVA region" 605 " 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx, container, iova, end); 606 goto fail; 607 } 608 609 memory_region_ref(section->mr); 610 611 if (memory_region_is_iommu(section->mr)) { 612 VFIOGuestIOMMU *giommu; 613 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr); 614 int iommu_idx; 615 616 trace_vfio_listener_region_add_iommu(iova, end); 617 /* 618 * FIXME: For VFIO iommu types which have KVM acceleration to 619 * avoid bouncing all map/unmaps through qemu this way, this 620 * would be the right place to wire that up (tell the KVM 621 * device emulation the VFIO iommu handles to use). 622 */ 623 giommu = g_malloc0(sizeof(*giommu)); 624 giommu->iommu = iommu_mr; 625 giommu->iommu_offset = section->offset_within_address_space - 626 section->offset_within_region; 627 giommu->container = container; 628 llend = int128_add(int128_make64(section->offset_within_region), 629 section->size); 630 llend = int128_sub(llend, int128_one()); 631 iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr, 632 MEMTXATTRS_UNSPECIFIED); 633 iommu_notifier_init(&giommu->n, vfio_iommu_map_notify, 634 IOMMU_NOTIFIER_ALL, 635 section->offset_within_region, 636 int128_get64(llend), 637 iommu_idx); 638 639 ret = memory_region_register_iommu_notifier(section->mr, &giommu->n, 640 &err); 641 if (ret) { 642 g_free(giommu); 643 goto fail; 644 } 645 QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next); 646 memory_region_iommu_replay(giommu->iommu, &giommu->n); 647 648 return; 649 } 650 651 /* Here we assume that memory_region_is_ram(section->mr)==true */ 652 653 vaddr = memory_region_get_ram_ptr(section->mr) + 654 section->offset_within_region + 655 (iova - section->offset_within_address_space); 656 657 trace_vfio_listener_region_add_ram(iova, end, vaddr); 658 659 llsize = int128_sub(llend, int128_make64(iova)); 660 661 if (memory_region_is_ram_device(section->mr)) { 662 hwaddr pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; 663 664 if ((iova & pgmask) || (int128_get64(llsize) & pgmask)) { 665 trace_vfio_listener_region_add_no_dma_map( 666 memory_region_name(section->mr), 667 section->offset_within_address_space, 668 int128_getlo(section->size), 669 pgmask + 1); 670 return; 671 } 672 } 673 674 ret = vfio_dma_map(container, iova, int128_get64(llsize), 675 vaddr, section->readonly); 676 if (ret) { 677 error_setg(&err, "vfio_dma_map(%p, 0x%"HWADDR_PRIx", " 678 "0x%"HWADDR_PRIx", %p) = %d (%m)", 679 container, iova, int128_get64(llsize), vaddr, ret); 680 if (memory_region_is_ram_device(section->mr)) { 681 /* Allow unexpected mappings not to be fatal for RAM devices */ 682 error_report_err(err); 683 return; 684 } 685 goto fail; 686 } 687 688 return; 689 690 fail: 691 if (memory_region_is_ram_device(section->mr)) { 692 error_report("failed to vfio_dma_map. pci p2p may not work"); 693 return; 694 } 695 /* 696 * On the initfn path, store the first error in the container so we 697 * can gracefully fail. Runtime, there's not much we can do other 698 * than throw a hardware error. 699 */ 700 if (!container->initialized) { 701 if (!container->error) { 702 error_propagate_prepend(&container->error, err, 703 "Region %s: ", 704 memory_region_name(section->mr)); 705 } else { 706 error_free(err); 707 } 708 } else { 709 error_report_err(err); 710 hw_error("vfio: DMA mapping failed, unable to continue"); 711 } 712 } 713 714 static void vfio_listener_region_del(MemoryListener *listener, 715 MemoryRegionSection *section) 716 { 717 VFIOContainer *container = container_of(listener, VFIOContainer, listener); 718 hwaddr iova, end; 719 Int128 llend, llsize; 720 int ret; 721 bool try_unmap = true; 722 723 if (vfio_listener_skipped_section(section)) { 724 trace_vfio_listener_region_del_skip( 725 section->offset_within_address_space, 726 section->offset_within_address_space + 727 int128_get64(int128_sub(section->size, int128_one()))); 728 return; 729 } 730 731 if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) != 732 (section->offset_within_region & ~TARGET_PAGE_MASK))) { 733 error_report("%s received unaligned region", __func__); 734 return; 735 } 736 737 if (memory_region_is_iommu(section->mr)) { 738 VFIOGuestIOMMU *giommu; 739 740 QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) { 741 if (MEMORY_REGION(giommu->iommu) == section->mr && 742 giommu->n.start == section->offset_within_region) { 743 memory_region_unregister_iommu_notifier(section->mr, 744 &giommu->n); 745 QLIST_REMOVE(giommu, giommu_next); 746 g_free(giommu); 747 break; 748 } 749 } 750 751 /* 752 * FIXME: We assume the one big unmap below is adequate to 753 * remove any individual page mappings in the IOMMU which 754 * might have been copied into VFIO. This works for a page table 755 * based IOMMU where a big unmap flattens a large range of IO-PTEs. 756 * That may not be true for all IOMMU types. 757 */ 758 } 759 760 iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); 761 llend = int128_make64(section->offset_within_address_space); 762 llend = int128_add(llend, section->size); 763 llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); 764 765 if (int128_ge(int128_make64(iova), llend)) { 766 return; 767 } 768 end = int128_get64(int128_sub(llend, int128_one())); 769 770 llsize = int128_sub(llend, int128_make64(iova)); 771 772 trace_vfio_listener_region_del(iova, end); 773 774 if (memory_region_is_ram_device(section->mr)) { 775 hwaddr pgmask; 776 VFIOHostDMAWindow *hostwin; 777 bool hostwin_found = false; 778 779 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 780 if (hostwin->min_iova <= iova && end <= hostwin->max_iova) { 781 hostwin_found = true; 782 break; 783 } 784 } 785 assert(hostwin_found); /* or region_add() would have failed */ 786 787 pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; 788 try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask)); 789 } 790 791 if (try_unmap) { 792 ret = vfio_dma_unmap(container, iova, int128_get64(llsize)); 793 if (ret) { 794 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " 795 "0x%"HWADDR_PRIx") = %d (%m)", 796 container, iova, int128_get64(llsize), ret); 797 } 798 } 799 800 memory_region_unref(section->mr); 801 802 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 803 vfio_spapr_remove_window(container, 804 section->offset_within_address_space); 805 if (vfio_host_win_del(container, 806 section->offset_within_address_space, 807 section->offset_within_address_space + 808 int128_get64(section->size) - 1) < 0) { 809 hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx, 810 __func__, section->offset_within_address_space); 811 } 812 } 813 } 814 815 static const MemoryListener vfio_memory_listener = { 816 .region_add = vfio_listener_region_add, 817 .region_del = vfio_listener_region_del, 818 }; 819 820 static void vfio_listener_release(VFIOContainer *container) 821 { 822 memory_listener_unregister(&container->listener); 823 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 824 memory_listener_unregister(&container->prereg_listener); 825 } 826 } 827 828 struct vfio_info_cap_header * 829 vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id) 830 { 831 struct vfio_info_cap_header *hdr; 832 void *ptr = info; 833 834 if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) { 835 return NULL; 836 } 837 838 for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) { 839 if (hdr->id == id) { 840 return hdr; 841 } 842 } 843 844 return NULL; 845 } 846 847 static int vfio_setup_region_sparse_mmaps(VFIORegion *region, 848 struct vfio_region_info *info) 849 { 850 struct vfio_info_cap_header *hdr; 851 struct vfio_region_info_cap_sparse_mmap *sparse; 852 int i, j; 853 854 hdr = vfio_get_region_info_cap(info, VFIO_REGION_INFO_CAP_SPARSE_MMAP); 855 if (!hdr) { 856 return -ENODEV; 857 } 858 859 sparse = container_of(hdr, struct vfio_region_info_cap_sparse_mmap, header); 860 861 trace_vfio_region_sparse_mmap_header(region->vbasedev->name, 862 region->nr, sparse->nr_areas); 863 864 region->mmaps = g_new0(VFIOMmap, sparse->nr_areas); 865 866 for (i = 0, j = 0; i < sparse->nr_areas; i++) { 867 trace_vfio_region_sparse_mmap_entry(i, sparse->areas[i].offset, 868 sparse->areas[i].offset + 869 sparse->areas[i].size); 870 871 if (sparse->areas[i].size) { 872 region->mmaps[j].offset = sparse->areas[i].offset; 873 region->mmaps[j].size = sparse->areas[i].size; 874 j++; 875 } 876 } 877 878 region->nr_mmaps = j; 879 region->mmaps = g_realloc(region->mmaps, j * sizeof(VFIOMmap)); 880 881 return 0; 882 } 883 884 int vfio_region_setup(Object *obj, VFIODevice *vbasedev, VFIORegion *region, 885 int index, const char *name) 886 { 887 struct vfio_region_info *info; 888 int ret; 889 890 ret = vfio_get_region_info(vbasedev, index, &info); 891 if (ret) { 892 return ret; 893 } 894 895 region->vbasedev = vbasedev; 896 region->flags = info->flags; 897 region->size = info->size; 898 region->fd_offset = info->offset; 899 region->nr = index; 900 901 if (region->size) { 902 region->mem = g_new0(MemoryRegion, 1); 903 memory_region_init_io(region->mem, obj, &vfio_region_ops, 904 region, name, region->size); 905 906 if (!vbasedev->no_mmap && 907 region->flags & VFIO_REGION_INFO_FLAG_MMAP) { 908 909 ret = vfio_setup_region_sparse_mmaps(region, info); 910 911 if (ret) { 912 region->nr_mmaps = 1; 913 region->mmaps = g_new0(VFIOMmap, region->nr_mmaps); 914 region->mmaps[0].offset = 0; 915 region->mmaps[0].size = region->size; 916 } 917 } 918 } 919 920 g_free(info); 921 922 trace_vfio_region_setup(vbasedev->name, index, name, 923 region->flags, region->fd_offset, region->size); 924 return 0; 925 } 926 927 int vfio_region_mmap(VFIORegion *region) 928 { 929 int i, prot = 0; 930 char *name; 931 932 if (!region->mem) { 933 return 0; 934 } 935 936 prot |= region->flags & VFIO_REGION_INFO_FLAG_READ ? PROT_READ : 0; 937 prot |= region->flags & VFIO_REGION_INFO_FLAG_WRITE ? PROT_WRITE : 0; 938 939 for (i = 0; i < region->nr_mmaps; i++) { 940 region->mmaps[i].mmap = mmap(NULL, region->mmaps[i].size, prot, 941 MAP_SHARED, region->vbasedev->fd, 942 region->fd_offset + 943 region->mmaps[i].offset); 944 if (region->mmaps[i].mmap == MAP_FAILED) { 945 int ret = -errno; 946 947 trace_vfio_region_mmap_fault(memory_region_name(region->mem), i, 948 region->fd_offset + 949 region->mmaps[i].offset, 950 region->fd_offset + 951 region->mmaps[i].offset + 952 region->mmaps[i].size - 1, ret); 953 954 region->mmaps[i].mmap = NULL; 955 956 for (i--; i >= 0; i--) { 957 memory_region_del_subregion(region->mem, ®ion->mmaps[i].mem); 958 munmap(region->mmaps[i].mmap, region->mmaps[i].size); 959 object_unparent(OBJECT(®ion->mmaps[i].mem)); 960 region->mmaps[i].mmap = NULL; 961 } 962 963 return ret; 964 } 965 966 name = g_strdup_printf("%s mmaps[%d]", 967 memory_region_name(region->mem), i); 968 memory_region_init_ram_device_ptr(®ion->mmaps[i].mem, 969 memory_region_owner(region->mem), 970 name, region->mmaps[i].size, 971 region->mmaps[i].mmap); 972 g_free(name); 973 memory_region_add_subregion(region->mem, region->mmaps[i].offset, 974 ®ion->mmaps[i].mem); 975 976 trace_vfio_region_mmap(memory_region_name(®ion->mmaps[i].mem), 977 region->mmaps[i].offset, 978 region->mmaps[i].offset + 979 region->mmaps[i].size - 1); 980 } 981 982 return 0; 983 } 984 985 void vfio_region_exit(VFIORegion *region) 986 { 987 int i; 988 989 if (!region->mem) { 990 return; 991 } 992 993 for (i = 0; i < region->nr_mmaps; i++) { 994 if (region->mmaps[i].mmap) { 995 memory_region_del_subregion(region->mem, ®ion->mmaps[i].mem); 996 } 997 } 998 999 trace_vfio_region_exit(region->vbasedev->name, region->nr); 1000 } 1001 1002 void vfio_region_finalize(VFIORegion *region) 1003 { 1004 int i; 1005 1006 if (!region->mem) { 1007 return; 1008 } 1009 1010 for (i = 0; i < region->nr_mmaps; i++) { 1011 if (region->mmaps[i].mmap) { 1012 munmap(region->mmaps[i].mmap, region->mmaps[i].size); 1013 object_unparent(OBJECT(®ion->mmaps[i].mem)); 1014 } 1015 } 1016 1017 object_unparent(OBJECT(region->mem)); 1018 1019 g_free(region->mem); 1020 g_free(region->mmaps); 1021 1022 trace_vfio_region_finalize(region->vbasedev->name, region->nr); 1023 1024 region->mem = NULL; 1025 region->mmaps = NULL; 1026 region->nr_mmaps = 0; 1027 region->size = 0; 1028 region->flags = 0; 1029 region->nr = 0; 1030 } 1031 1032 void vfio_region_mmaps_set_enabled(VFIORegion *region, bool enabled) 1033 { 1034 int i; 1035 1036 if (!region->mem) { 1037 return; 1038 } 1039 1040 for (i = 0; i < region->nr_mmaps; i++) { 1041 if (region->mmaps[i].mmap) { 1042 memory_region_set_enabled(®ion->mmaps[i].mem, enabled); 1043 } 1044 } 1045 1046 trace_vfio_region_mmaps_set_enabled(memory_region_name(region->mem), 1047 enabled); 1048 } 1049 1050 void vfio_reset_handler(void *opaque) 1051 { 1052 VFIOGroup *group; 1053 VFIODevice *vbasedev; 1054 1055 QLIST_FOREACH(group, &vfio_group_list, next) { 1056 QLIST_FOREACH(vbasedev, &group->device_list, next) { 1057 if (vbasedev->dev->realized) { 1058 vbasedev->ops->vfio_compute_needs_reset(vbasedev); 1059 } 1060 } 1061 } 1062 1063 QLIST_FOREACH(group, &vfio_group_list, next) { 1064 QLIST_FOREACH(vbasedev, &group->device_list, next) { 1065 if (vbasedev->dev->realized && vbasedev->needs_reset) { 1066 vbasedev->ops->vfio_hot_reset_multi(vbasedev); 1067 } 1068 } 1069 } 1070 } 1071 1072 static void vfio_kvm_device_add_group(VFIOGroup *group) 1073 { 1074 #ifdef CONFIG_KVM 1075 struct kvm_device_attr attr = { 1076 .group = KVM_DEV_VFIO_GROUP, 1077 .attr = KVM_DEV_VFIO_GROUP_ADD, 1078 .addr = (uint64_t)(unsigned long)&group->fd, 1079 }; 1080 1081 if (!kvm_enabled()) { 1082 return; 1083 } 1084 1085 if (vfio_kvm_device_fd < 0) { 1086 struct kvm_create_device cd = { 1087 .type = KVM_DEV_TYPE_VFIO, 1088 }; 1089 1090 if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) { 1091 error_report("Failed to create KVM VFIO device: %m"); 1092 return; 1093 } 1094 1095 vfio_kvm_device_fd = cd.fd; 1096 } 1097 1098 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 1099 error_report("Failed to add group %d to KVM VFIO device: %m", 1100 group->groupid); 1101 } 1102 #endif 1103 } 1104 1105 static void vfio_kvm_device_del_group(VFIOGroup *group) 1106 { 1107 #ifdef CONFIG_KVM 1108 struct kvm_device_attr attr = { 1109 .group = KVM_DEV_VFIO_GROUP, 1110 .attr = KVM_DEV_VFIO_GROUP_DEL, 1111 .addr = (uint64_t)(unsigned long)&group->fd, 1112 }; 1113 1114 if (vfio_kvm_device_fd < 0) { 1115 return; 1116 } 1117 1118 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 1119 error_report("Failed to remove group %d from KVM VFIO device: %m", 1120 group->groupid); 1121 } 1122 #endif 1123 } 1124 1125 static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as) 1126 { 1127 VFIOAddressSpace *space; 1128 1129 QLIST_FOREACH(space, &vfio_address_spaces, list) { 1130 if (space->as == as) { 1131 return space; 1132 } 1133 } 1134 1135 /* No suitable VFIOAddressSpace, create a new one */ 1136 space = g_malloc0(sizeof(*space)); 1137 space->as = as; 1138 QLIST_INIT(&space->containers); 1139 1140 QLIST_INSERT_HEAD(&vfio_address_spaces, space, list); 1141 1142 return space; 1143 } 1144 1145 static void vfio_put_address_space(VFIOAddressSpace *space) 1146 { 1147 if (QLIST_EMPTY(&space->containers)) { 1148 QLIST_REMOVE(space, list); 1149 g_free(space); 1150 } 1151 } 1152 1153 /* 1154 * vfio_get_iommu_type - selects the richest iommu_type (v2 first) 1155 */ 1156 static int vfio_get_iommu_type(VFIOContainer *container, 1157 Error **errp) 1158 { 1159 int iommu_types[] = { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU, 1160 VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU }; 1161 int i; 1162 1163 for (i = 0; i < ARRAY_SIZE(iommu_types); i++) { 1164 if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) { 1165 return iommu_types[i]; 1166 } 1167 } 1168 error_setg(errp, "No available IOMMU models"); 1169 return -EINVAL; 1170 } 1171 1172 static int vfio_init_container(VFIOContainer *container, int group_fd, 1173 Error **errp) 1174 { 1175 int iommu_type, ret; 1176 1177 iommu_type = vfio_get_iommu_type(container, errp); 1178 if (iommu_type < 0) { 1179 return iommu_type; 1180 } 1181 1182 ret = ioctl(group_fd, VFIO_GROUP_SET_CONTAINER, &container->fd); 1183 if (ret) { 1184 error_setg_errno(errp, errno, "Failed to set group container"); 1185 return -errno; 1186 } 1187 1188 while (ioctl(container->fd, VFIO_SET_IOMMU, iommu_type)) { 1189 if (iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 1190 /* 1191 * On sPAPR, despite the IOMMU subdriver always advertises v1 and 1192 * v2, the running platform may not support v2 and there is no 1193 * way to guess it until an IOMMU group gets added to the container. 1194 * So in case it fails with v2, try v1 as a fallback. 1195 */ 1196 iommu_type = VFIO_SPAPR_TCE_IOMMU; 1197 continue; 1198 } 1199 error_setg_errno(errp, errno, "Failed to set iommu for container"); 1200 return -errno; 1201 } 1202 1203 container->iommu_type = iommu_type; 1204 return 0; 1205 } 1206 1207 static int vfio_connect_container(VFIOGroup *group, AddressSpace *as, 1208 Error **errp) 1209 { 1210 VFIOContainer *container; 1211 int ret, fd; 1212 VFIOAddressSpace *space; 1213 1214 space = vfio_get_address_space(as); 1215 1216 /* 1217 * VFIO is currently incompatible with discarding of RAM insofar as the 1218 * madvise to purge (zap) the page from QEMU's address space does not 1219 * interact with the memory API and therefore leaves stale virtual to 1220 * physical mappings in the IOMMU if the page was previously pinned. We 1221 * therefore set discarding broken for each group added to a container, 1222 * whether the container is used individually or shared. This provides 1223 * us with options to allow devices within a group to opt-in and allow 1224 * discarding, so long as it is done consistently for a group (for instance 1225 * if the device is an mdev device where it is known that the host vendor 1226 * driver will never pin pages outside of the working set of the guest 1227 * driver, which would thus not be discarding candidates). 1228 * 1229 * The first opportunity to induce pinning occurs here where we attempt to 1230 * attach the group to existing containers within the AddressSpace. If any 1231 * pages are already zapped from the virtual address space, such as from 1232 * previous discards, new pinning will cause valid mappings to be 1233 * re-established. Likewise, when the overall MemoryListener for a new 1234 * container is registered, a replay of mappings within the AddressSpace 1235 * will occur, re-establishing any previously zapped pages as well. 1236 * 1237 * Especially virtio-balloon is currently only prevented from discarding 1238 * new memory, it will not yet set ram_block_discard_set_required() and 1239 * therefore, neither stops us here or deals with the sudden memory 1240 * consumption of inflated memory. 1241 */ 1242 ret = ram_block_discard_disable(true); 1243 if (ret) { 1244 error_setg_errno(errp, -ret, "Cannot set discarding of RAM broken"); 1245 return ret; 1246 } 1247 1248 QLIST_FOREACH(container, &space->containers, next) { 1249 if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) { 1250 group->container = container; 1251 QLIST_INSERT_HEAD(&container->group_list, group, container_next); 1252 vfio_kvm_device_add_group(group); 1253 return 0; 1254 } 1255 } 1256 1257 fd = qemu_open("/dev/vfio/vfio", O_RDWR); 1258 if (fd < 0) { 1259 error_setg_errno(errp, errno, "failed to open /dev/vfio/vfio"); 1260 ret = -errno; 1261 goto put_space_exit; 1262 } 1263 1264 ret = ioctl(fd, VFIO_GET_API_VERSION); 1265 if (ret != VFIO_API_VERSION) { 1266 error_setg(errp, "supported vfio version: %d, " 1267 "reported version: %d", VFIO_API_VERSION, ret); 1268 ret = -EINVAL; 1269 goto close_fd_exit; 1270 } 1271 1272 container = g_malloc0(sizeof(*container)); 1273 container->space = space; 1274 container->fd = fd; 1275 container->error = NULL; 1276 QLIST_INIT(&container->giommu_list); 1277 QLIST_INIT(&container->hostwin_list); 1278 1279 ret = vfio_init_container(container, group->fd, errp); 1280 if (ret) { 1281 goto free_container_exit; 1282 } 1283 1284 switch (container->iommu_type) { 1285 case VFIO_TYPE1v2_IOMMU: 1286 case VFIO_TYPE1_IOMMU: 1287 { 1288 struct vfio_iommu_type1_info info; 1289 1290 /* 1291 * FIXME: This assumes that a Type1 IOMMU can map any 64-bit 1292 * IOVA whatsoever. That's not actually true, but the current 1293 * kernel interface doesn't tell us what it can map, and the 1294 * existing Type1 IOMMUs generally support any IOVA we're 1295 * going to actually try in practice. 1296 */ 1297 info.argsz = sizeof(info); 1298 ret = ioctl(fd, VFIO_IOMMU_GET_INFO, &info); 1299 /* Ignore errors */ 1300 if (ret || !(info.flags & VFIO_IOMMU_INFO_PGSIZES)) { 1301 /* Assume 4k IOVA page size */ 1302 info.iova_pgsizes = 4096; 1303 } 1304 vfio_host_win_add(container, 0, (hwaddr)-1, info.iova_pgsizes); 1305 container->pgsizes = info.iova_pgsizes; 1306 break; 1307 } 1308 case VFIO_SPAPR_TCE_v2_IOMMU: 1309 case VFIO_SPAPR_TCE_IOMMU: 1310 { 1311 struct vfio_iommu_spapr_tce_info info; 1312 bool v2 = container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU; 1313 1314 /* 1315 * The host kernel code implementing VFIO_IOMMU_DISABLE is called 1316 * when container fd is closed so we do not call it explicitly 1317 * in this file. 1318 */ 1319 if (!v2) { 1320 ret = ioctl(fd, VFIO_IOMMU_ENABLE); 1321 if (ret) { 1322 error_setg_errno(errp, errno, "failed to enable container"); 1323 ret = -errno; 1324 goto free_container_exit; 1325 } 1326 } else { 1327 container->prereg_listener = vfio_prereg_listener; 1328 1329 memory_listener_register(&container->prereg_listener, 1330 &address_space_memory); 1331 if (container->error) { 1332 memory_listener_unregister(&container->prereg_listener); 1333 ret = -1; 1334 error_propagate_prepend(errp, container->error, 1335 "RAM memory listener initialization failed: "); 1336 goto free_container_exit; 1337 } 1338 } 1339 1340 info.argsz = sizeof(info); 1341 ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info); 1342 if (ret) { 1343 error_setg_errno(errp, errno, 1344 "VFIO_IOMMU_SPAPR_TCE_GET_INFO failed"); 1345 ret = -errno; 1346 if (v2) { 1347 memory_listener_unregister(&container->prereg_listener); 1348 } 1349 goto free_container_exit; 1350 } 1351 1352 if (v2) { 1353 container->pgsizes = info.ddw.pgsizes; 1354 /* 1355 * There is a default window in just created container. 1356 * To make region_add/del simpler, we better remove this 1357 * window now and let those iommu_listener callbacks 1358 * create/remove them when needed. 1359 */ 1360 ret = vfio_spapr_remove_window(container, info.dma32_window_start); 1361 if (ret) { 1362 error_setg_errno(errp, -ret, 1363 "failed to remove existing window"); 1364 goto free_container_exit; 1365 } 1366 } else { 1367 /* The default table uses 4K pages */ 1368 container->pgsizes = 0x1000; 1369 vfio_host_win_add(container, info.dma32_window_start, 1370 info.dma32_window_start + 1371 info.dma32_window_size - 1, 1372 0x1000); 1373 } 1374 } 1375 } 1376 1377 vfio_kvm_device_add_group(group); 1378 1379 QLIST_INIT(&container->group_list); 1380 QLIST_INSERT_HEAD(&space->containers, container, next); 1381 1382 group->container = container; 1383 QLIST_INSERT_HEAD(&container->group_list, group, container_next); 1384 1385 container->listener = vfio_memory_listener; 1386 1387 memory_listener_register(&container->listener, container->space->as); 1388 1389 if (container->error) { 1390 ret = -1; 1391 error_propagate_prepend(errp, container->error, 1392 "memory listener initialization failed: "); 1393 goto listener_release_exit; 1394 } 1395 1396 container->initialized = true; 1397 1398 return 0; 1399 listener_release_exit: 1400 QLIST_REMOVE(group, container_next); 1401 QLIST_REMOVE(container, next); 1402 vfio_kvm_device_del_group(group); 1403 vfio_listener_release(container); 1404 1405 free_container_exit: 1406 g_free(container); 1407 1408 close_fd_exit: 1409 close(fd); 1410 1411 put_space_exit: 1412 ram_block_discard_disable(false); 1413 vfio_put_address_space(space); 1414 1415 return ret; 1416 } 1417 1418 static void vfio_disconnect_container(VFIOGroup *group) 1419 { 1420 VFIOContainer *container = group->container; 1421 1422 QLIST_REMOVE(group, container_next); 1423 group->container = NULL; 1424 1425 /* 1426 * Explicitly release the listener first before unset container, 1427 * since unset may destroy the backend container if it's the last 1428 * group. 1429 */ 1430 if (QLIST_EMPTY(&container->group_list)) { 1431 vfio_listener_release(container); 1432 } 1433 1434 if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) { 1435 error_report("vfio: error disconnecting group %d from container", 1436 group->groupid); 1437 } 1438 1439 if (QLIST_EMPTY(&container->group_list)) { 1440 VFIOAddressSpace *space = container->space; 1441 VFIOGuestIOMMU *giommu, *tmp; 1442 1443 QLIST_REMOVE(container, next); 1444 1445 QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) { 1446 memory_region_unregister_iommu_notifier( 1447 MEMORY_REGION(giommu->iommu), &giommu->n); 1448 QLIST_REMOVE(giommu, giommu_next); 1449 g_free(giommu); 1450 } 1451 1452 trace_vfio_disconnect_container(container->fd); 1453 close(container->fd); 1454 g_free(container); 1455 1456 vfio_put_address_space(space); 1457 } 1458 } 1459 1460 VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp) 1461 { 1462 VFIOGroup *group; 1463 char path[32]; 1464 struct vfio_group_status status = { .argsz = sizeof(status) }; 1465 1466 QLIST_FOREACH(group, &vfio_group_list, next) { 1467 if (group->groupid == groupid) { 1468 /* Found it. Now is it already in the right context? */ 1469 if (group->container->space->as == as) { 1470 return group; 1471 } else { 1472 error_setg(errp, "group %d used in multiple address spaces", 1473 group->groupid); 1474 return NULL; 1475 } 1476 } 1477 } 1478 1479 group = g_malloc0(sizeof(*group)); 1480 1481 snprintf(path, sizeof(path), "/dev/vfio/%d", groupid); 1482 group->fd = qemu_open(path, O_RDWR); 1483 if (group->fd < 0) { 1484 error_setg_errno(errp, errno, "failed to open %s", path); 1485 goto free_group_exit; 1486 } 1487 1488 if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) { 1489 error_setg_errno(errp, errno, "failed to get group %d status", groupid); 1490 goto close_fd_exit; 1491 } 1492 1493 if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) { 1494 error_setg(errp, "group %d is not viable", groupid); 1495 error_append_hint(errp, 1496 "Please ensure all devices within the iommu_group " 1497 "are bound to their vfio bus driver.\n"); 1498 goto close_fd_exit; 1499 } 1500 1501 group->groupid = groupid; 1502 QLIST_INIT(&group->device_list); 1503 1504 if (vfio_connect_container(group, as, errp)) { 1505 error_prepend(errp, "failed to setup container for group %d: ", 1506 groupid); 1507 goto close_fd_exit; 1508 } 1509 1510 if (QLIST_EMPTY(&vfio_group_list)) { 1511 qemu_register_reset(vfio_reset_handler, NULL); 1512 } 1513 1514 QLIST_INSERT_HEAD(&vfio_group_list, group, next); 1515 1516 return group; 1517 1518 close_fd_exit: 1519 close(group->fd); 1520 1521 free_group_exit: 1522 g_free(group); 1523 1524 return NULL; 1525 } 1526 1527 void vfio_put_group(VFIOGroup *group) 1528 { 1529 if (!group || !QLIST_EMPTY(&group->device_list)) { 1530 return; 1531 } 1532 1533 if (!group->ram_block_discard_allowed) { 1534 ram_block_discard_disable(false); 1535 } 1536 vfio_kvm_device_del_group(group); 1537 vfio_disconnect_container(group); 1538 QLIST_REMOVE(group, next); 1539 trace_vfio_put_group(group->fd); 1540 close(group->fd); 1541 g_free(group); 1542 1543 if (QLIST_EMPTY(&vfio_group_list)) { 1544 qemu_unregister_reset(vfio_reset_handler, NULL); 1545 } 1546 } 1547 1548 int vfio_get_device(VFIOGroup *group, const char *name, 1549 VFIODevice *vbasedev, Error **errp) 1550 { 1551 struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) }; 1552 int ret, fd; 1553 1554 fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name); 1555 if (fd < 0) { 1556 error_setg_errno(errp, errno, "error getting device from group %d", 1557 group->groupid); 1558 error_append_hint(errp, 1559 "Verify all devices in group %d are bound to vfio-<bus> " 1560 "or pci-stub and not already in use\n", group->groupid); 1561 return fd; 1562 } 1563 1564 ret = ioctl(fd, VFIO_DEVICE_GET_INFO, &dev_info); 1565 if (ret) { 1566 error_setg_errno(errp, errno, "error getting device info"); 1567 close(fd); 1568 return ret; 1569 } 1570 1571 /* 1572 * Set discarding of RAM as not broken for this group if the driver knows 1573 * the device operates compatibly with discarding. Setting must be 1574 * consistent per group, but since compatibility is really only possible 1575 * with mdev currently, we expect singleton groups. 1576 */ 1577 if (vbasedev->ram_block_discard_allowed != 1578 group->ram_block_discard_allowed) { 1579 if (!QLIST_EMPTY(&group->device_list)) { 1580 error_setg(errp, "Inconsistent setting of support for discarding " 1581 "RAM (e.g., balloon) within group"); 1582 close(fd); 1583 return -1; 1584 } 1585 1586 if (!group->ram_block_discard_allowed) { 1587 group->ram_block_discard_allowed = true; 1588 ram_block_discard_disable(false); 1589 } 1590 } 1591 1592 vbasedev->fd = fd; 1593 vbasedev->group = group; 1594 QLIST_INSERT_HEAD(&group->device_list, vbasedev, next); 1595 1596 vbasedev->num_irqs = dev_info.num_irqs; 1597 vbasedev->num_regions = dev_info.num_regions; 1598 vbasedev->flags = dev_info.flags; 1599 1600 trace_vfio_get_device(name, dev_info.flags, dev_info.num_regions, 1601 dev_info.num_irqs); 1602 1603 vbasedev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET); 1604 return 0; 1605 } 1606 1607 void vfio_put_base_device(VFIODevice *vbasedev) 1608 { 1609 if (!vbasedev->group) { 1610 return; 1611 } 1612 QLIST_REMOVE(vbasedev, next); 1613 vbasedev->group = NULL; 1614 trace_vfio_put_base_device(vbasedev->fd); 1615 close(vbasedev->fd); 1616 } 1617 1618 int vfio_get_region_info(VFIODevice *vbasedev, int index, 1619 struct vfio_region_info **info) 1620 { 1621 size_t argsz = sizeof(struct vfio_region_info); 1622 1623 *info = g_malloc0(argsz); 1624 1625 (*info)->index = index; 1626 retry: 1627 (*info)->argsz = argsz; 1628 1629 if (ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, *info)) { 1630 g_free(*info); 1631 *info = NULL; 1632 return -errno; 1633 } 1634 1635 if ((*info)->argsz > argsz) { 1636 argsz = (*info)->argsz; 1637 *info = g_realloc(*info, argsz); 1638 1639 goto retry; 1640 } 1641 1642 return 0; 1643 } 1644 1645 int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t type, 1646 uint32_t subtype, struct vfio_region_info **info) 1647 { 1648 int i; 1649 1650 for (i = 0; i < vbasedev->num_regions; i++) { 1651 struct vfio_info_cap_header *hdr; 1652 struct vfio_region_info_cap_type *cap_type; 1653 1654 if (vfio_get_region_info(vbasedev, i, info)) { 1655 continue; 1656 } 1657 1658 hdr = vfio_get_region_info_cap(*info, VFIO_REGION_INFO_CAP_TYPE); 1659 if (!hdr) { 1660 g_free(*info); 1661 continue; 1662 } 1663 1664 cap_type = container_of(hdr, struct vfio_region_info_cap_type, header); 1665 1666 trace_vfio_get_dev_region(vbasedev->name, i, 1667 cap_type->type, cap_type->subtype); 1668 1669 if (cap_type->type == type && cap_type->subtype == subtype) { 1670 return 0; 1671 } 1672 1673 g_free(*info); 1674 } 1675 1676 *info = NULL; 1677 return -ENODEV; 1678 } 1679 1680 bool vfio_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_type) 1681 { 1682 struct vfio_region_info *info = NULL; 1683 bool ret = false; 1684 1685 if (!vfio_get_region_info(vbasedev, region, &info)) { 1686 if (vfio_get_region_info_cap(info, cap_type)) { 1687 ret = true; 1688 } 1689 g_free(info); 1690 } 1691 1692 return ret; 1693 } 1694 1695 /* 1696 * Interfaces for IBM EEH (Enhanced Error Handling) 1697 */ 1698 static bool vfio_eeh_container_ok(VFIOContainer *container) 1699 { 1700 /* 1701 * As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO 1702 * implementation is broken if there are multiple groups in a 1703 * container. The hardware works in units of Partitionable 1704 * Endpoints (== IOMMU groups) and the EEH operations naively 1705 * iterate across all groups in the container, without any logic 1706 * to make sure the groups have their state synchronized. For 1707 * certain operations (ENABLE) that might be ok, until an error 1708 * occurs, but for others (GET_STATE) it's clearly broken. 1709 */ 1710 1711 /* 1712 * XXX Once fixed kernels exist, test for them here 1713 */ 1714 1715 if (QLIST_EMPTY(&container->group_list)) { 1716 return false; 1717 } 1718 1719 if (QLIST_NEXT(QLIST_FIRST(&container->group_list), container_next)) { 1720 return false; 1721 } 1722 1723 return true; 1724 } 1725 1726 static int vfio_eeh_container_op(VFIOContainer *container, uint32_t op) 1727 { 1728 struct vfio_eeh_pe_op pe_op = { 1729 .argsz = sizeof(pe_op), 1730 .op = op, 1731 }; 1732 int ret; 1733 1734 if (!vfio_eeh_container_ok(container)) { 1735 error_report("vfio/eeh: EEH_PE_OP 0x%x: " 1736 "kernel requires a container with exactly one group", op); 1737 return -EPERM; 1738 } 1739 1740 ret = ioctl(container->fd, VFIO_EEH_PE_OP, &pe_op); 1741 if (ret < 0) { 1742 error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op); 1743 return -errno; 1744 } 1745 1746 return ret; 1747 } 1748 1749 static VFIOContainer *vfio_eeh_as_container(AddressSpace *as) 1750 { 1751 VFIOAddressSpace *space = vfio_get_address_space(as); 1752 VFIOContainer *container = NULL; 1753 1754 if (QLIST_EMPTY(&space->containers)) { 1755 /* No containers to act on */ 1756 goto out; 1757 } 1758 1759 container = QLIST_FIRST(&space->containers); 1760 1761 if (QLIST_NEXT(container, next)) { 1762 /* We don't yet have logic to synchronize EEH state across 1763 * multiple containers */ 1764 container = NULL; 1765 goto out; 1766 } 1767 1768 out: 1769 vfio_put_address_space(space); 1770 return container; 1771 } 1772 1773 bool vfio_eeh_as_ok(AddressSpace *as) 1774 { 1775 VFIOContainer *container = vfio_eeh_as_container(as); 1776 1777 return (container != NULL) && vfio_eeh_container_ok(container); 1778 } 1779 1780 int vfio_eeh_as_op(AddressSpace *as, uint32_t op) 1781 { 1782 VFIOContainer *container = vfio_eeh_as_container(as); 1783 1784 if (!container) { 1785 return -ENODEV; 1786 } 1787 return vfio_eeh_container_op(container, op); 1788 } 1789