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 "exec/ram_addr.h" 33 #include "hw/hw.h" 34 #include "qemu/error-report.h" 35 #include "qemu/main-loop.h" 36 #include "qemu/range.h" 37 #include "sysemu/kvm.h" 38 #include "sysemu/reset.h" 39 #include "trace.h" 40 #include "qapi/error.h" 41 #include "migration/migration.h" 42 43 VFIOGroupList vfio_group_list = 44 QLIST_HEAD_INITIALIZER(vfio_group_list); 45 static QLIST_HEAD(, VFIOAddressSpace) vfio_address_spaces = 46 QLIST_HEAD_INITIALIZER(vfio_address_spaces); 47 48 #ifdef CONFIG_KVM 49 /* 50 * We have a single VFIO pseudo device per KVM VM. Once created it lives 51 * for the life of the VM. Closing the file descriptor only drops our 52 * reference to it and the device's reference to kvm. Therefore once 53 * initialized, this file descriptor is only released on QEMU exit and 54 * we'll re-use it should another vfio device be attached before then. 55 */ 56 static int vfio_kvm_device_fd = -1; 57 #endif 58 59 /* 60 * Common VFIO interrupt disable 61 */ 62 void vfio_disable_irqindex(VFIODevice *vbasedev, int index) 63 { 64 struct vfio_irq_set irq_set = { 65 .argsz = sizeof(irq_set), 66 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER, 67 .index = index, 68 .start = 0, 69 .count = 0, 70 }; 71 72 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 73 } 74 75 void vfio_unmask_single_irqindex(VFIODevice *vbasedev, int index) 76 { 77 struct vfio_irq_set irq_set = { 78 .argsz = sizeof(irq_set), 79 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK, 80 .index = index, 81 .start = 0, 82 .count = 1, 83 }; 84 85 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 86 } 87 88 void vfio_mask_single_irqindex(VFIODevice *vbasedev, int index) 89 { 90 struct vfio_irq_set irq_set = { 91 .argsz = sizeof(irq_set), 92 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK, 93 .index = index, 94 .start = 0, 95 .count = 1, 96 }; 97 98 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 99 } 100 101 static inline const char *action_to_str(int action) 102 { 103 switch (action) { 104 case VFIO_IRQ_SET_ACTION_MASK: 105 return "MASK"; 106 case VFIO_IRQ_SET_ACTION_UNMASK: 107 return "UNMASK"; 108 case VFIO_IRQ_SET_ACTION_TRIGGER: 109 return "TRIGGER"; 110 default: 111 return "UNKNOWN ACTION"; 112 } 113 } 114 115 static const char *index_to_str(VFIODevice *vbasedev, int index) 116 { 117 if (vbasedev->type != VFIO_DEVICE_TYPE_PCI) { 118 return NULL; 119 } 120 121 switch (index) { 122 case VFIO_PCI_INTX_IRQ_INDEX: 123 return "INTX"; 124 case VFIO_PCI_MSI_IRQ_INDEX: 125 return "MSI"; 126 case VFIO_PCI_MSIX_IRQ_INDEX: 127 return "MSIX"; 128 case VFIO_PCI_ERR_IRQ_INDEX: 129 return "ERR"; 130 case VFIO_PCI_REQ_IRQ_INDEX: 131 return "REQ"; 132 default: 133 return NULL; 134 } 135 } 136 137 int vfio_set_irq_signaling(VFIODevice *vbasedev, int index, int subindex, 138 int action, int fd, Error **errp) 139 { 140 struct vfio_irq_set *irq_set; 141 int argsz, ret = 0; 142 const char *name; 143 int32_t *pfd; 144 145 argsz = sizeof(*irq_set) + sizeof(*pfd); 146 147 irq_set = g_malloc0(argsz); 148 irq_set->argsz = argsz; 149 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | action; 150 irq_set->index = index; 151 irq_set->start = subindex; 152 irq_set->count = 1; 153 pfd = (int32_t *)&irq_set->data; 154 *pfd = fd; 155 156 if (ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, irq_set)) { 157 ret = -errno; 158 } 159 g_free(irq_set); 160 161 if (!ret) { 162 return 0; 163 } 164 165 error_setg_errno(errp, -ret, "VFIO_DEVICE_SET_IRQS failure"); 166 167 name = index_to_str(vbasedev, index); 168 if (name) { 169 error_prepend(errp, "%s-%d: ", name, subindex); 170 } else { 171 error_prepend(errp, "index %d-%d: ", index, subindex); 172 } 173 error_prepend(errp, 174 "Failed to %s %s eventfd signaling for interrupt ", 175 fd < 0 ? "tear down" : "set up", action_to_str(action)); 176 return ret; 177 } 178 179 /* 180 * IO Port/MMIO - Beware of the endians, VFIO is always little endian 181 */ 182 void vfio_region_write(void *opaque, hwaddr addr, 183 uint64_t data, unsigned size) 184 { 185 VFIORegion *region = opaque; 186 VFIODevice *vbasedev = region->vbasedev; 187 union { 188 uint8_t byte; 189 uint16_t word; 190 uint32_t dword; 191 uint64_t qword; 192 } buf; 193 194 switch (size) { 195 case 1: 196 buf.byte = data; 197 break; 198 case 2: 199 buf.word = cpu_to_le16(data); 200 break; 201 case 4: 202 buf.dword = cpu_to_le32(data); 203 break; 204 case 8: 205 buf.qword = cpu_to_le64(data); 206 break; 207 default: 208 hw_error("vfio: unsupported write size, %u bytes", size); 209 break; 210 } 211 212 if (pwrite(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) { 213 error_report("%s(%s:region%d+0x%"HWADDR_PRIx", 0x%"PRIx64 214 ",%d) failed: %m", 215 __func__, vbasedev->name, region->nr, 216 addr, data, size); 217 } 218 219 trace_vfio_region_write(vbasedev->name, region->nr, addr, data, size); 220 221 /* 222 * A read or write to a BAR always signals an INTx EOI. This will 223 * do nothing if not pending (including not in INTx mode). We assume 224 * that a BAR access is in response to an interrupt and that BAR 225 * accesses will service the interrupt. Unfortunately, we don't know 226 * which access will service the interrupt, so we're potentially 227 * getting quite a few host interrupts per guest interrupt. 228 */ 229 vbasedev->ops->vfio_eoi(vbasedev); 230 } 231 232 uint64_t vfio_region_read(void *opaque, 233 hwaddr addr, unsigned size) 234 { 235 VFIORegion *region = opaque; 236 VFIODevice *vbasedev = region->vbasedev; 237 union { 238 uint8_t byte; 239 uint16_t word; 240 uint32_t dword; 241 uint64_t qword; 242 } buf; 243 uint64_t data = 0; 244 245 if (pread(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) { 246 error_report("%s(%s:region%d+0x%"HWADDR_PRIx", %d) failed: %m", 247 __func__, vbasedev->name, region->nr, 248 addr, size); 249 return (uint64_t)-1; 250 } 251 switch (size) { 252 case 1: 253 data = buf.byte; 254 break; 255 case 2: 256 data = le16_to_cpu(buf.word); 257 break; 258 case 4: 259 data = le32_to_cpu(buf.dword); 260 break; 261 case 8: 262 data = le64_to_cpu(buf.qword); 263 break; 264 default: 265 hw_error("vfio: unsupported read size, %u bytes", size); 266 break; 267 } 268 269 trace_vfio_region_read(vbasedev->name, region->nr, addr, size, data); 270 271 /* Same as write above */ 272 vbasedev->ops->vfio_eoi(vbasedev); 273 274 return data; 275 } 276 277 const MemoryRegionOps vfio_region_ops = { 278 .read = vfio_region_read, 279 .write = vfio_region_write, 280 .endianness = DEVICE_LITTLE_ENDIAN, 281 .valid = { 282 .min_access_size = 1, 283 .max_access_size = 8, 284 }, 285 .impl = { 286 .min_access_size = 1, 287 .max_access_size = 8, 288 }, 289 }; 290 291 /* 292 * Device state interfaces 293 */ 294 295 bool vfio_mig_active(void) 296 { 297 VFIOGroup *group; 298 VFIODevice *vbasedev; 299 300 if (QLIST_EMPTY(&vfio_group_list)) { 301 return false; 302 } 303 304 QLIST_FOREACH(group, &vfio_group_list, next) { 305 QLIST_FOREACH(vbasedev, &group->device_list, next) { 306 if (vbasedev->migration_blocker) { 307 return false; 308 } 309 } 310 } 311 return true; 312 } 313 314 static bool vfio_devices_all_saving(VFIOContainer *container) 315 { 316 VFIOGroup *group; 317 VFIODevice *vbasedev; 318 MigrationState *ms = migrate_get_current(); 319 320 if (!migration_is_setup_or_active(ms->state)) { 321 return false; 322 } 323 324 QLIST_FOREACH(group, &container->group_list, container_next) { 325 QLIST_FOREACH(vbasedev, &group->device_list, next) { 326 VFIOMigration *migration = vbasedev->migration; 327 328 if (!migration) { 329 return false; 330 } 331 332 if (migration->device_state & VFIO_DEVICE_STATE_SAVING) { 333 if ((vbasedev->pre_copy_dirty_page_tracking == ON_OFF_AUTO_OFF) 334 && (migration->device_state & VFIO_DEVICE_STATE_RUNNING)) { 335 return false; 336 } 337 continue; 338 } else { 339 return false; 340 } 341 } 342 } 343 return true; 344 } 345 346 static bool vfio_devices_all_running_and_saving(VFIOContainer *container) 347 { 348 VFIOGroup *group; 349 VFIODevice *vbasedev; 350 MigrationState *ms = migrate_get_current(); 351 352 if (!migration_is_setup_or_active(ms->state)) { 353 return false; 354 } 355 356 QLIST_FOREACH(group, &container->group_list, container_next) { 357 QLIST_FOREACH(vbasedev, &group->device_list, next) { 358 VFIOMigration *migration = vbasedev->migration; 359 360 if (!migration) { 361 return false; 362 } 363 364 if ((migration->device_state & VFIO_DEVICE_STATE_SAVING) && 365 (migration->device_state & VFIO_DEVICE_STATE_RUNNING)) { 366 continue; 367 } else { 368 return false; 369 } 370 } 371 } 372 return true; 373 } 374 375 static int vfio_dma_unmap_bitmap(VFIOContainer *container, 376 hwaddr iova, ram_addr_t size, 377 IOMMUTLBEntry *iotlb) 378 { 379 struct vfio_iommu_type1_dma_unmap *unmap; 380 struct vfio_bitmap *bitmap; 381 uint64_t pages = TARGET_PAGE_ALIGN(size) >> TARGET_PAGE_BITS; 382 int ret; 383 384 unmap = g_malloc0(sizeof(*unmap) + sizeof(*bitmap)); 385 386 unmap->argsz = sizeof(*unmap) + sizeof(*bitmap); 387 unmap->iova = iova; 388 unmap->size = size; 389 unmap->flags |= VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP; 390 bitmap = (struct vfio_bitmap *)&unmap->data; 391 392 /* 393 * cpu_physical_memory_set_dirty_lebitmap() expects pages in bitmap of 394 * TARGET_PAGE_SIZE to mark those dirty. Hence set bitmap_pgsize to 395 * TARGET_PAGE_SIZE. 396 */ 397 398 bitmap->pgsize = TARGET_PAGE_SIZE; 399 bitmap->size = ROUND_UP(pages, sizeof(__u64) * BITS_PER_BYTE) / 400 BITS_PER_BYTE; 401 402 if (bitmap->size > container->max_dirty_bitmap_size) { 403 error_report("UNMAP: Size of bitmap too big 0x%"PRIx64, 404 (uint64_t)bitmap->size); 405 ret = -E2BIG; 406 goto unmap_exit; 407 } 408 409 bitmap->data = g_try_malloc0(bitmap->size); 410 if (!bitmap->data) { 411 ret = -ENOMEM; 412 goto unmap_exit; 413 } 414 415 ret = ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, unmap); 416 if (!ret) { 417 cpu_physical_memory_set_dirty_lebitmap((unsigned long *)bitmap->data, 418 iotlb->translated_addr, pages); 419 } else { 420 error_report("VFIO_UNMAP_DMA with DIRTY_BITMAP : %m"); 421 } 422 423 g_free(bitmap->data); 424 unmap_exit: 425 g_free(unmap); 426 return ret; 427 } 428 429 /* 430 * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86 431 */ 432 static int vfio_dma_unmap(VFIOContainer *container, 433 hwaddr iova, ram_addr_t size, 434 IOMMUTLBEntry *iotlb) 435 { 436 struct vfio_iommu_type1_dma_unmap unmap = { 437 .argsz = sizeof(unmap), 438 .flags = 0, 439 .iova = iova, 440 .size = size, 441 }; 442 443 if (iotlb && container->dirty_pages_supported && 444 vfio_devices_all_running_and_saving(container)) { 445 return vfio_dma_unmap_bitmap(container, iova, size, iotlb); 446 } 447 448 while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) { 449 /* 450 * The type1 backend has an off-by-one bug in the kernel (71a7d3d78e3c 451 * v4.15) where an overflow in its wrap-around check prevents us from 452 * unmapping the last page of the address space. Test for the error 453 * condition and re-try the unmap excluding the last page. The 454 * expectation is that we've never mapped the last page anyway and this 455 * unmap request comes via vIOMMU support which also makes it unlikely 456 * that this page is used. This bug was introduced well after type1 v2 457 * support was introduced, so we shouldn't need to test for v1. A fix 458 * is queued for kernel v5.0 so this workaround can be removed once 459 * affected kernels are sufficiently deprecated. 460 */ 461 if (errno == EINVAL && unmap.size && !(unmap.iova + unmap.size) && 462 container->iommu_type == VFIO_TYPE1v2_IOMMU) { 463 trace_vfio_dma_unmap_overflow_workaround(); 464 unmap.size -= 1ULL << ctz64(container->pgsizes); 465 continue; 466 } 467 error_report("VFIO_UNMAP_DMA failed: %s", strerror(errno)); 468 return -errno; 469 } 470 471 return 0; 472 } 473 474 static int vfio_dma_map(VFIOContainer *container, hwaddr iova, 475 ram_addr_t size, void *vaddr, bool readonly) 476 { 477 struct vfio_iommu_type1_dma_map map = { 478 .argsz = sizeof(map), 479 .flags = VFIO_DMA_MAP_FLAG_READ, 480 .vaddr = (__u64)(uintptr_t)vaddr, 481 .iova = iova, 482 .size = size, 483 }; 484 485 if (!readonly) { 486 map.flags |= VFIO_DMA_MAP_FLAG_WRITE; 487 } 488 489 /* 490 * Try the mapping, if it fails with EBUSY, unmap the region and try 491 * again. This shouldn't be necessary, but we sometimes see it in 492 * the VGA ROM space. 493 */ 494 if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 || 495 (errno == EBUSY && vfio_dma_unmap(container, iova, size, NULL) == 0 && 496 ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) { 497 return 0; 498 } 499 500 error_report("VFIO_MAP_DMA failed: %s", strerror(errno)); 501 return -errno; 502 } 503 504 static void vfio_host_win_add(VFIOContainer *container, 505 hwaddr min_iova, hwaddr max_iova, 506 uint64_t iova_pgsizes) 507 { 508 VFIOHostDMAWindow *hostwin; 509 510 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 511 if (ranges_overlap(hostwin->min_iova, 512 hostwin->max_iova - hostwin->min_iova + 1, 513 min_iova, 514 max_iova - min_iova + 1)) { 515 hw_error("%s: Overlapped IOMMU are not enabled", __func__); 516 } 517 } 518 519 hostwin = g_malloc0(sizeof(*hostwin)); 520 521 hostwin->min_iova = min_iova; 522 hostwin->max_iova = max_iova; 523 hostwin->iova_pgsizes = iova_pgsizes; 524 QLIST_INSERT_HEAD(&container->hostwin_list, hostwin, hostwin_next); 525 } 526 527 static int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova, 528 hwaddr max_iova) 529 { 530 VFIOHostDMAWindow *hostwin; 531 532 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 533 if (hostwin->min_iova == min_iova && hostwin->max_iova == max_iova) { 534 QLIST_REMOVE(hostwin, hostwin_next); 535 return 0; 536 } 537 } 538 539 return -1; 540 } 541 542 static bool vfio_listener_skipped_section(MemoryRegionSection *section) 543 { 544 return (!memory_region_is_ram(section->mr) && 545 !memory_region_is_iommu(section->mr)) || 546 /* 547 * Sizing an enabled 64-bit BAR can cause spurious mappings to 548 * addresses in the upper part of the 64-bit address space. These 549 * are never accessed by the CPU and beyond the address width of 550 * some IOMMU hardware. TODO: VFIO should tell us the IOMMU width. 551 */ 552 section->offset_within_address_space & (1ULL << 63); 553 } 554 555 /* Called with rcu_read_lock held. */ 556 static bool vfio_get_xlat_addr(IOMMUTLBEntry *iotlb, void **vaddr, 557 ram_addr_t *ram_addr, bool *read_only) 558 { 559 MemoryRegion *mr; 560 hwaddr xlat; 561 hwaddr len = iotlb->addr_mask + 1; 562 bool writable = iotlb->perm & IOMMU_WO; 563 564 /* 565 * The IOMMU TLB entry we have just covers translation through 566 * this IOMMU to its immediate target. We need to translate 567 * it the rest of the way through to memory. 568 */ 569 mr = address_space_translate(&address_space_memory, 570 iotlb->translated_addr, 571 &xlat, &len, writable, 572 MEMTXATTRS_UNSPECIFIED); 573 if (!memory_region_is_ram(mr)) { 574 error_report("iommu map to non memory area %"HWADDR_PRIx"", 575 xlat); 576 return false; 577 } 578 579 /* 580 * Translation truncates length to the IOMMU page size, 581 * check that it did not truncate too much. 582 */ 583 if (len & iotlb->addr_mask) { 584 error_report("iommu has granularity incompatible with target AS"); 585 return false; 586 } 587 588 if (vaddr) { 589 *vaddr = memory_region_get_ram_ptr(mr) + xlat; 590 } 591 592 if (ram_addr) { 593 *ram_addr = memory_region_get_ram_addr(mr) + xlat; 594 } 595 596 if (read_only) { 597 *read_only = !writable || mr->readonly; 598 } 599 600 return true; 601 } 602 603 static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) 604 { 605 VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n); 606 VFIOContainer *container = giommu->container; 607 hwaddr iova = iotlb->iova + giommu->iommu_offset; 608 void *vaddr; 609 int ret; 610 611 trace_vfio_iommu_map_notify(iotlb->perm == IOMMU_NONE ? "UNMAP" : "MAP", 612 iova, iova + iotlb->addr_mask); 613 614 if (iotlb->target_as != &address_space_memory) { 615 error_report("Wrong target AS \"%s\", only system memory is allowed", 616 iotlb->target_as->name ? iotlb->target_as->name : "none"); 617 return; 618 } 619 620 rcu_read_lock(); 621 622 if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) { 623 bool read_only; 624 625 if (!vfio_get_xlat_addr(iotlb, &vaddr, NULL, &read_only)) { 626 goto out; 627 } 628 /* 629 * vaddr is only valid until rcu_read_unlock(). But after 630 * vfio_dma_map has set up the mapping the pages will be 631 * pinned by the kernel. This makes sure that the RAM backend 632 * of vaddr will always be there, even if the memory object is 633 * destroyed and its backing memory munmap-ed. 634 */ 635 ret = vfio_dma_map(container, iova, 636 iotlb->addr_mask + 1, vaddr, 637 read_only); 638 if (ret) { 639 error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", " 640 "0x%"HWADDR_PRIx", %p) = %d (%m)", 641 container, iova, 642 iotlb->addr_mask + 1, vaddr, ret); 643 } 644 } else { 645 ret = vfio_dma_unmap(container, iova, iotlb->addr_mask + 1, iotlb); 646 if (ret) { 647 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " 648 "0x%"HWADDR_PRIx") = %d (%m)", 649 container, iova, 650 iotlb->addr_mask + 1, ret); 651 } 652 } 653 out: 654 rcu_read_unlock(); 655 } 656 657 static void vfio_listener_region_add(MemoryListener *listener, 658 MemoryRegionSection *section) 659 { 660 VFIOContainer *container = container_of(listener, VFIOContainer, listener); 661 hwaddr iova, end; 662 Int128 llend, llsize; 663 void *vaddr; 664 int ret; 665 VFIOHostDMAWindow *hostwin; 666 bool hostwin_found; 667 Error *err = NULL; 668 669 if (vfio_listener_skipped_section(section)) { 670 trace_vfio_listener_region_add_skip( 671 section->offset_within_address_space, 672 section->offset_within_address_space + 673 int128_get64(int128_sub(section->size, int128_one()))); 674 return; 675 } 676 677 if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) != 678 (section->offset_within_region & ~TARGET_PAGE_MASK))) { 679 error_report("%s received unaligned region", __func__); 680 return; 681 } 682 683 iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); 684 llend = int128_make64(section->offset_within_address_space); 685 llend = int128_add(llend, section->size); 686 llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); 687 688 if (int128_ge(int128_make64(iova), llend)) { 689 return; 690 } 691 end = int128_get64(int128_sub(llend, int128_one())); 692 693 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 694 hwaddr pgsize = 0; 695 696 /* For now intersections are not allowed, we may relax this later */ 697 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 698 if (ranges_overlap(hostwin->min_iova, 699 hostwin->max_iova - hostwin->min_iova + 1, 700 section->offset_within_address_space, 701 int128_get64(section->size))) { 702 error_setg(&err, 703 "region [0x%"PRIx64",0x%"PRIx64"] overlaps with existing" 704 "host DMA window [0x%"PRIx64",0x%"PRIx64"]", 705 section->offset_within_address_space, 706 section->offset_within_address_space + 707 int128_get64(section->size) - 1, 708 hostwin->min_iova, hostwin->max_iova); 709 goto fail; 710 } 711 } 712 713 ret = vfio_spapr_create_window(container, section, &pgsize); 714 if (ret) { 715 error_setg_errno(&err, -ret, "Failed to create SPAPR window"); 716 goto fail; 717 } 718 719 vfio_host_win_add(container, section->offset_within_address_space, 720 section->offset_within_address_space + 721 int128_get64(section->size) - 1, pgsize); 722 #ifdef CONFIG_KVM 723 if (kvm_enabled()) { 724 VFIOGroup *group; 725 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr); 726 struct kvm_vfio_spapr_tce param; 727 struct kvm_device_attr attr = { 728 .group = KVM_DEV_VFIO_GROUP, 729 .attr = KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE, 730 .addr = (uint64_t)(unsigned long)¶m, 731 }; 732 733 if (!memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_SPAPR_TCE_FD, 734 ¶m.tablefd)) { 735 QLIST_FOREACH(group, &container->group_list, container_next) { 736 param.groupfd = group->fd; 737 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 738 error_report("vfio: failed to setup fd %d " 739 "for a group with fd %d: %s", 740 param.tablefd, param.groupfd, 741 strerror(errno)); 742 return; 743 } 744 trace_vfio_spapr_group_attach(param.groupfd, param.tablefd); 745 } 746 } 747 } 748 #endif 749 } 750 751 hostwin_found = false; 752 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 753 if (hostwin->min_iova <= iova && end <= hostwin->max_iova) { 754 hostwin_found = true; 755 break; 756 } 757 } 758 759 if (!hostwin_found) { 760 error_setg(&err, "Container %p can't map guest IOVA region" 761 " 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx, container, iova, end); 762 goto fail; 763 } 764 765 memory_region_ref(section->mr); 766 767 if (memory_region_is_iommu(section->mr)) { 768 VFIOGuestIOMMU *giommu; 769 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr); 770 int iommu_idx; 771 772 trace_vfio_listener_region_add_iommu(iova, end); 773 /* 774 * FIXME: For VFIO iommu types which have KVM acceleration to 775 * avoid bouncing all map/unmaps through qemu this way, this 776 * would be the right place to wire that up (tell the KVM 777 * device emulation the VFIO iommu handles to use). 778 */ 779 giommu = g_malloc0(sizeof(*giommu)); 780 giommu->iommu = iommu_mr; 781 giommu->iommu_offset = section->offset_within_address_space - 782 section->offset_within_region; 783 giommu->container = container; 784 llend = int128_add(int128_make64(section->offset_within_region), 785 section->size); 786 llend = int128_sub(llend, int128_one()); 787 iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr, 788 MEMTXATTRS_UNSPECIFIED); 789 iommu_notifier_init(&giommu->n, vfio_iommu_map_notify, 790 IOMMU_NOTIFIER_ALL, 791 section->offset_within_region, 792 int128_get64(llend), 793 iommu_idx); 794 795 ret = memory_region_iommu_set_page_size_mask(giommu->iommu, 796 container->pgsizes, 797 &err); 798 if (ret) { 799 g_free(giommu); 800 goto fail; 801 } 802 803 ret = memory_region_register_iommu_notifier(section->mr, &giommu->n, 804 &err); 805 if (ret) { 806 g_free(giommu); 807 goto fail; 808 } 809 QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next); 810 memory_region_iommu_replay(giommu->iommu, &giommu->n); 811 812 return; 813 } 814 815 /* Here we assume that memory_region_is_ram(section->mr)==true */ 816 817 vaddr = memory_region_get_ram_ptr(section->mr) + 818 section->offset_within_region + 819 (iova - section->offset_within_address_space); 820 821 trace_vfio_listener_region_add_ram(iova, end, vaddr); 822 823 llsize = int128_sub(llend, int128_make64(iova)); 824 825 if (memory_region_is_ram_device(section->mr)) { 826 hwaddr pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; 827 828 if ((iova & pgmask) || (int128_get64(llsize) & pgmask)) { 829 trace_vfio_listener_region_add_no_dma_map( 830 memory_region_name(section->mr), 831 section->offset_within_address_space, 832 int128_getlo(section->size), 833 pgmask + 1); 834 return; 835 } 836 } 837 838 ret = vfio_dma_map(container, iova, int128_get64(llsize), 839 vaddr, section->readonly); 840 if (ret) { 841 error_setg(&err, "vfio_dma_map(%p, 0x%"HWADDR_PRIx", " 842 "0x%"HWADDR_PRIx", %p) = %d (%m)", 843 container, iova, int128_get64(llsize), vaddr, ret); 844 if (memory_region_is_ram_device(section->mr)) { 845 /* Allow unexpected mappings not to be fatal for RAM devices */ 846 error_report_err(err); 847 return; 848 } 849 goto fail; 850 } 851 852 return; 853 854 fail: 855 if (memory_region_is_ram_device(section->mr)) { 856 error_report("failed to vfio_dma_map. pci p2p may not work"); 857 return; 858 } 859 /* 860 * On the initfn path, store the first error in the container so we 861 * can gracefully fail. Runtime, there's not much we can do other 862 * than throw a hardware error. 863 */ 864 if (!container->initialized) { 865 if (!container->error) { 866 error_propagate_prepend(&container->error, err, 867 "Region %s: ", 868 memory_region_name(section->mr)); 869 } else { 870 error_free(err); 871 } 872 } else { 873 error_report_err(err); 874 hw_error("vfio: DMA mapping failed, unable to continue"); 875 } 876 } 877 878 static void vfio_listener_region_del(MemoryListener *listener, 879 MemoryRegionSection *section) 880 { 881 VFIOContainer *container = container_of(listener, VFIOContainer, listener); 882 hwaddr iova, end; 883 Int128 llend, llsize; 884 int ret; 885 bool try_unmap = true; 886 887 if (vfio_listener_skipped_section(section)) { 888 trace_vfio_listener_region_del_skip( 889 section->offset_within_address_space, 890 section->offset_within_address_space + 891 int128_get64(int128_sub(section->size, int128_one()))); 892 return; 893 } 894 895 if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) != 896 (section->offset_within_region & ~TARGET_PAGE_MASK))) { 897 error_report("%s received unaligned region", __func__); 898 return; 899 } 900 901 if (memory_region_is_iommu(section->mr)) { 902 VFIOGuestIOMMU *giommu; 903 904 QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) { 905 if (MEMORY_REGION(giommu->iommu) == section->mr && 906 giommu->n.start == section->offset_within_region) { 907 memory_region_unregister_iommu_notifier(section->mr, 908 &giommu->n); 909 QLIST_REMOVE(giommu, giommu_next); 910 g_free(giommu); 911 break; 912 } 913 } 914 915 /* 916 * FIXME: We assume the one big unmap below is adequate to 917 * remove any individual page mappings in the IOMMU which 918 * might have been copied into VFIO. This works for a page table 919 * based IOMMU where a big unmap flattens a large range of IO-PTEs. 920 * That may not be true for all IOMMU types. 921 */ 922 } 923 924 iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); 925 llend = int128_make64(section->offset_within_address_space); 926 llend = int128_add(llend, section->size); 927 llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); 928 929 if (int128_ge(int128_make64(iova), llend)) { 930 return; 931 } 932 end = int128_get64(int128_sub(llend, int128_one())); 933 934 llsize = int128_sub(llend, int128_make64(iova)); 935 936 trace_vfio_listener_region_del(iova, end); 937 938 if (memory_region_is_ram_device(section->mr)) { 939 hwaddr pgmask; 940 VFIOHostDMAWindow *hostwin; 941 bool hostwin_found = false; 942 943 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 944 if (hostwin->min_iova <= iova && end <= hostwin->max_iova) { 945 hostwin_found = true; 946 break; 947 } 948 } 949 assert(hostwin_found); /* or region_add() would have failed */ 950 951 pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; 952 try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask)); 953 } 954 955 if (try_unmap) { 956 if (int128_eq(llsize, int128_2_64())) { 957 /* The unmap ioctl doesn't accept a full 64-bit span. */ 958 llsize = int128_rshift(llsize, 1); 959 ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL); 960 if (ret) { 961 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " 962 "0x%"HWADDR_PRIx") = %d (%m)", 963 container, iova, int128_get64(llsize), ret); 964 } 965 iova += int128_get64(llsize); 966 } 967 ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL); 968 if (ret) { 969 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " 970 "0x%"HWADDR_PRIx") = %d (%m)", 971 container, iova, int128_get64(llsize), ret); 972 } 973 } 974 975 memory_region_unref(section->mr); 976 977 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 978 vfio_spapr_remove_window(container, 979 section->offset_within_address_space); 980 if (vfio_host_win_del(container, 981 section->offset_within_address_space, 982 section->offset_within_address_space + 983 int128_get64(section->size) - 1) < 0) { 984 hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx, 985 __func__, section->offset_within_address_space); 986 } 987 } 988 } 989 990 static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova, 991 uint64_t size, ram_addr_t ram_addr) 992 { 993 struct vfio_iommu_type1_dirty_bitmap *dbitmap; 994 struct vfio_iommu_type1_dirty_bitmap_get *range; 995 uint64_t pages; 996 int ret; 997 998 dbitmap = g_malloc0(sizeof(*dbitmap) + sizeof(*range)); 999 1000 dbitmap->argsz = sizeof(*dbitmap) + sizeof(*range); 1001 dbitmap->flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP; 1002 range = (struct vfio_iommu_type1_dirty_bitmap_get *)&dbitmap->data; 1003 range->iova = iova; 1004 range->size = size; 1005 1006 /* 1007 * cpu_physical_memory_set_dirty_lebitmap() expects pages in bitmap of 1008 * TARGET_PAGE_SIZE to mark those dirty. Hence set bitmap's pgsize to 1009 * TARGET_PAGE_SIZE. 1010 */ 1011 range->bitmap.pgsize = TARGET_PAGE_SIZE; 1012 1013 pages = TARGET_PAGE_ALIGN(range->size) >> TARGET_PAGE_BITS; 1014 range->bitmap.size = ROUND_UP(pages, sizeof(__u64) * BITS_PER_BYTE) / 1015 BITS_PER_BYTE; 1016 range->bitmap.data = g_try_malloc0(range->bitmap.size); 1017 if (!range->bitmap.data) { 1018 ret = -ENOMEM; 1019 goto err_out; 1020 } 1021 1022 ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, dbitmap); 1023 if (ret) { 1024 error_report("Failed to get dirty bitmap for iova: 0x%"PRIx64 1025 " size: 0x%"PRIx64" err: %d", (uint64_t)range->iova, 1026 (uint64_t)range->size, errno); 1027 goto err_out; 1028 } 1029 1030 cpu_physical_memory_set_dirty_lebitmap((unsigned long *)range->bitmap.data, 1031 ram_addr, pages); 1032 1033 trace_vfio_get_dirty_bitmap(container->fd, range->iova, range->size, 1034 range->bitmap.size, ram_addr); 1035 err_out: 1036 g_free(range->bitmap.data); 1037 g_free(dbitmap); 1038 1039 return ret; 1040 } 1041 1042 typedef struct { 1043 IOMMUNotifier n; 1044 VFIOGuestIOMMU *giommu; 1045 } vfio_giommu_dirty_notifier; 1046 1047 static void vfio_iommu_map_dirty_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) 1048 { 1049 vfio_giommu_dirty_notifier *gdn = container_of(n, 1050 vfio_giommu_dirty_notifier, n); 1051 VFIOGuestIOMMU *giommu = gdn->giommu; 1052 VFIOContainer *container = giommu->container; 1053 hwaddr iova = iotlb->iova + giommu->iommu_offset; 1054 ram_addr_t translated_addr; 1055 1056 trace_vfio_iommu_map_dirty_notify(iova, iova + iotlb->addr_mask); 1057 1058 if (iotlb->target_as != &address_space_memory) { 1059 error_report("Wrong target AS \"%s\", only system memory is allowed", 1060 iotlb->target_as->name ? iotlb->target_as->name : "none"); 1061 return; 1062 } 1063 1064 rcu_read_lock(); 1065 if (vfio_get_xlat_addr(iotlb, NULL, &translated_addr, NULL)) { 1066 int ret; 1067 1068 ret = vfio_get_dirty_bitmap(container, iova, iotlb->addr_mask + 1, 1069 translated_addr); 1070 if (ret) { 1071 error_report("vfio_iommu_map_dirty_notify(%p, 0x%"HWADDR_PRIx", " 1072 "0x%"HWADDR_PRIx") = %d (%m)", 1073 container, iova, 1074 iotlb->addr_mask + 1, ret); 1075 } 1076 } 1077 rcu_read_unlock(); 1078 } 1079 1080 static int vfio_sync_dirty_bitmap(VFIOContainer *container, 1081 MemoryRegionSection *section) 1082 { 1083 ram_addr_t ram_addr; 1084 1085 if (memory_region_is_iommu(section->mr)) { 1086 VFIOGuestIOMMU *giommu; 1087 1088 QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) { 1089 if (MEMORY_REGION(giommu->iommu) == section->mr && 1090 giommu->n.start == section->offset_within_region) { 1091 Int128 llend; 1092 vfio_giommu_dirty_notifier gdn = { .giommu = giommu }; 1093 int idx = memory_region_iommu_attrs_to_index(giommu->iommu, 1094 MEMTXATTRS_UNSPECIFIED); 1095 1096 llend = int128_add(int128_make64(section->offset_within_region), 1097 section->size); 1098 llend = int128_sub(llend, int128_one()); 1099 1100 iommu_notifier_init(&gdn.n, 1101 vfio_iommu_map_dirty_notify, 1102 IOMMU_NOTIFIER_MAP, 1103 section->offset_within_region, 1104 int128_get64(llend), 1105 idx); 1106 memory_region_iommu_replay(giommu->iommu, &gdn.n); 1107 break; 1108 } 1109 } 1110 return 0; 1111 } 1112 1113 ram_addr = memory_region_get_ram_addr(section->mr) + 1114 section->offset_within_region; 1115 1116 return vfio_get_dirty_bitmap(container, 1117 TARGET_PAGE_ALIGN(section->offset_within_address_space), 1118 int128_get64(section->size), ram_addr); 1119 } 1120 1121 static void vfio_listerner_log_sync(MemoryListener *listener, 1122 MemoryRegionSection *section) 1123 { 1124 VFIOContainer *container = container_of(listener, VFIOContainer, listener); 1125 1126 if (vfio_listener_skipped_section(section) || 1127 !container->dirty_pages_supported) { 1128 return; 1129 } 1130 1131 if (vfio_devices_all_saving(container)) { 1132 vfio_sync_dirty_bitmap(container, section); 1133 } 1134 } 1135 1136 static const MemoryListener vfio_memory_listener = { 1137 .region_add = vfio_listener_region_add, 1138 .region_del = vfio_listener_region_del, 1139 .log_sync = vfio_listerner_log_sync, 1140 }; 1141 1142 static void vfio_listener_release(VFIOContainer *container) 1143 { 1144 memory_listener_unregister(&container->listener); 1145 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 1146 memory_listener_unregister(&container->prereg_listener); 1147 } 1148 } 1149 1150 static struct vfio_info_cap_header * 1151 vfio_get_cap(void *ptr, uint32_t cap_offset, uint16_t id) 1152 { 1153 struct vfio_info_cap_header *hdr; 1154 1155 for (hdr = ptr + cap_offset; hdr != ptr; hdr = ptr + hdr->next) { 1156 if (hdr->id == id) { 1157 return hdr; 1158 } 1159 } 1160 1161 return NULL; 1162 } 1163 1164 struct vfio_info_cap_header * 1165 vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id) 1166 { 1167 if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) { 1168 return NULL; 1169 } 1170 1171 return vfio_get_cap((void *)info, info->cap_offset, id); 1172 } 1173 1174 static struct vfio_info_cap_header * 1175 vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info *info, uint16_t id) 1176 { 1177 if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) { 1178 return NULL; 1179 } 1180 1181 return vfio_get_cap((void *)info, info->cap_offset, id); 1182 } 1183 1184 struct vfio_info_cap_header * 1185 vfio_get_device_info_cap(struct vfio_device_info *info, uint16_t id) 1186 { 1187 if (!(info->flags & VFIO_DEVICE_FLAGS_CAPS)) { 1188 return NULL; 1189 } 1190 1191 return vfio_get_cap((void *)info, info->cap_offset, id); 1192 } 1193 1194 bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info, 1195 unsigned int *avail) 1196 { 1197 struct vfio_info_cap_header *hdr; 1198 struct vfio_iommu_type1_info_dma_avail *cap; 1199 1200 /* If the capability cannot be found, assume no DMA limiting */ 1201 hdr = vfio_get_iommu_type1_info_cap(info, 1202 VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL); 1203 if (hdr == NULL) { 1204 return false; 1205 } 1206 1207 if (avail != NULL) { 1208 cap = (void *) hdr; 1209 *avail = cap->avail; 1210 } 1211 1212 return true; 1213 } 1214 1215 static int vfio_setup_region_sparse_mmaps(VFIORegion *region, 1216 struct vfio_region_info *info) 1217 { 1218 struct vfio_info_cap_header *hdr; 1219 struct vfio_region_info_cap_sparse_mmap *sparse; 1220 int i, j; 1221 1222 hdr = vfio_get_region_info_cap(info, VFIO_REGION_INFO_CAP_SPARSE_MMAP); 1223 if (!hdr) { 1224 return -ENODEV; 1225 } 1226 1227 sparse = container_of(hdr, struct vfio_region_info_cap_sparse_mmap, header); 1228 1229 trace_vfio_region_sparse_mmap_header(region->vbasedev->name, 1230 region->nr, sparse->nr_areas); 1231 1232 region->mmaps = g_new0(VFIOMmap, sparse->nr_areas); 1233 1234 for (i = 0, j = 0; i < sparse->nr_areas; i++) { 1235 trace_vfio_region_sparse_mmap_entry(i, sparse->areas[i].offset, 1236 sparse->areas[i].offset + 1237 sparse->areas[i].size); 1238 1239 if (sparse->areas[i].size) { 1240 region->mmaps[j].offset = sparse->areas[i].offset; 1241 region->mmaps[j].size = sparse->areas[i].size; 1242 j++; 1243 } 1244 } 1245 1246 region->nr_mmaps = j; 1247 region->mmaps = g_realloc(region->mmaps, j * sizeof(VFIOMmap)); 1248 1249 return 0; 1250 } 1251 1252 int vfio_region_setup(Object *obj, VFIODevice *vbasedev, VFIORegion *region, 1253 int index, const char *name) 1254 { 1255 struct vfio_region_info *info; 1256 int ret; 1257 1258 ret = vfio_get_region_info(vbasedev, index, &info); 1259 if (ret) { 1260 return ret; 1261 } 1262 1263 region->vbasedev = vbasedev; 1264 region->flags = info->flags; 1265 region->size = info->size; 1266 region->fd_offset = info->offset; 1267 region->nr = index; 1268 1269 if (region->size) { 1270 region->mem = g_new0(MemoryRegion, 1); 1271 memory_region_init_io(region->mem, obj, &vfio_region_ops, 1272 region, name, region->size); 1273 1274 if (!vbasedev->no_mmap && 1275 region->flags & VFIO_REGION_INFO_FLAG_MMAP) { 1276 1277 ret = vfio_setup_region_sparse_mmaps(region, info); 1278 1279 if (ret) { 1280 region->nr_mmaps = 1; 1281 region->mmaps = g_new0(VFIOMmap, region->nr_mmaps); 1282 region->mmaps[0].offset = 0; 1283 region->mmaps[0].size = region->size; 1284 } 1285 } 1286 } 1287 1288 g_free(info); 1289 1290 trace_vfio_region_setup(vbasedev->name, index, name, 1291 region->flags, region->fd_offset, region->size); 1292 return 0; 1293 } 1294 1295 static void vfio_subregion_unmap(VFIORegion *region, int index) 1296 { 1297 trace_vfio_region_unmap(memory_region_name(®ion->mmaps[index].mem), 1298 region->mmaps[index].offset, 1299 region->mmaps[index].offset + 1300 region->mmaps[index].size - 1); 1301 memory_region_del_subregion(region->mem, ®ion->mmaps[index].mem); 1302 munmap(region->mmaps[index].mmap, region->mmaps[index].size); 1303 object_unparent(OBJECT(®ion->mmaps[index].mem)); 1304 region->mmaps[index].mmap = NULL; 1305 } 1306 1307 int vfio_region_mmap(VFIORegion *region) 1308 { 1309 int i, prot = 0; 1310 char *name; 1311 1312 if (!region->mem) { 1313 return 0; 1314 } 1315 1316 prot |= region->flags & VFIO_REGION_INFO_FLAG_READ ? PROT_READ : 0; 1317 prot |= region->flags & VFIO_REGION_INFO_FLAG_WRITE ? PROT_WRITE : 0; 1318 1319 for (i = 0; i < region->nr_mmaps; i++) { 1320 region->mmaps[i].mmap = mmap(NULL, region->mmaps[i].size, prot, 1321 MAP_SHARED, region->vbasedev->fd, 1322 region->fd_offset + 1323 region->mmaps[i].offset); 1324 if (region->mmaps[i].mmap == MAP_FAILED) { 1325 int ret = -errno; 1326 1327 trace_vfio_region_mmap_fault(memory_region_name(region->mem), i, 1328 region->fd_offset + 1329 region->mmaps[i].offset, 1330 region->fd_offset + 1331 region->mmaps[i].offset + 1332 region->mmaps[i].size - 1, ret); 1333 1334 region->mmaps[i].mmap = NULL; 1335 1336 for (i--; i >= 0; i--) { 1337 vfio_subregion_unmap(region, i); 1338 } 1339 1340 return ret; 1341 } 1342 1343 name = g_strdup_printf("%s mmaps[%d]", 1344 memory_region_name(region->mem), i); 1345 memory_region_init_ram_device_ptr(®ion->mmaps[i].mem, 1346 memory_region_owner(region->mem), 1347 name, region->mmaps[i].size, 1348 region->mmaps[i].mmap); 1349 g_free(name); 1350 memory_region_add_subregion(region->mem, region->mmaps[i].offset, 1351 ®ion->mmaps[i].mem); 1352 1353 trace_vfio_region_mmap(memory_region_name(®ion->mmaps[i].mem), 1354 region->mmaps[i].offset, 1355 region->mmaps[i].offset + 1356 region->mmaps[i].size - 1); 1357 } 1358 1359 return 0; 1360 } 1361 1362 void vfio_region_unmap(VFIORegion *region) 1363 { 1364 int i; 1365 1366 if (!region->mem) { 1367 return; 1368 } 1369 1370 for (i = 0; i < region->nr_mmaps; i++) { 1371 if (region->mmaps[i].mmap) { 1372 vfio_subregion_unmap(region, i); 1373 } 1374 } 1375 } 1376 1377 void vfio_region_exit(VFIORegion *region) 1378 { 1379 int i; 1380 1381 if (!region->mem) { 1382 return; 1383 } 1384 1385 for (i = 0; i < region->nr_mmaps; i++) { 1386 if (region->mmaps[i].mmap) { 1387 memory_region_del_subregion(region->mem, ®ion->mmaps[i].mem); 1388 } 1389 } 1390 1391 trace_vfio_region_exit(region->vbasedev->name, region->nr); 1392 } 1393 1394 void vfio_region_finalize(VFIORegion *region) 1395 { 1396 int i; 1397 1398 if (!region->mem) { 1399 return; 1400 } 1401 1402 for (i = 0; i < region->nr_mmaps; i++) { 1403 if (region->mmaps[i].mmap) { 1404 munmap(region->mmaps[i].mmap, region->mmaps[i].size); 1405 object_unparent(OBJECT(®ion->mmaps[i].mem)); 1406 } 1407 } 1408 1409 object_unparent(OBJECT(region->mem)); 1410 1411 g_free(region->mem); 1412 g_free(region->mmaps); 1413 1414 trace_vfio_region_finalize(region->vbasedev->name, region->nr); 1415 1416 region->mem = NULL; 1417 region->mmaps = NULL; 1418 region->nr_mmaps = 0; 1419 region->size = 0; 1420 region->flags = 0; 1421 region->nr = 0; 1422 } 1423 1424 void vfio_region_mmaps_set_enabled(VFIORegion *region, bool enabled) 1425 { 1426 int i; 1427 1428 if (!region->mem) { 1429 return; 1430 } 1431 1432 for (i = 0; i < region->nr_mmaps; i++) { 1433 if (region->mmaps[i].mmap) { 1434 memory_region_set_enabled(®ion->mmaps[i].mem, enabled); 1435 } 1436 } 1437 1438 trace_vfio_region_mmaps_set_enabled(memory_region_name(region->mem), 1439 enabled); 1440 } 1441 1442 void vfio_reset_handler(void *opaque) 1443 { 1444 VFIOGroup *group; 1445 VFIODevice *vbasedev; 1446 1447 QLIST_FOREACH(group, &vfio_group_list, next) { 1448 QLIST_FOREACH(vbasedev, &group->device_list, next) { 1449 if (vbasedev->dev->realized) { 1450 vbasedev->ops->vfio_compute_needs_reset(vbasedev); 1451 } 1452 } 1453 } 1454 1455 QLIST_FOREACH(group, &vfio_group_list, next) { 1456 QLIST_FOREACH(vbasedev, &group->device_list, next) { 1457 if (vbasedev->dev->realized && vbasedev->needs_reset) { 1458 vbasedev->ops->vfio_hot_reset_multi(vbasedev); 1459 } 1460 } 1461 } 1462 } 1463 1464 static void vfio_kvm_device_add_group(VFIOGroup *group) 1465 { 1466 #ifdef CONFIG_KVM 1467 struct kvm_device_attr attr = { 1468 .group = KVM_DEV_VFIO_GROUP, 1469 .attr = KVM_DEV_VFIO_GROUP_ADD, 1470 .addr = (uint64_t)(unsigned long)&group->fd, 1471 }; 1472 1473 if (!kvm_enabled()) { 1474 return; 1475 } 1476 1477 if (vfio_kvm_device_fd < 0) { 1478 struct kvm_create_device cd = { 1479 .type = KVM_DEV_TYPE_VFIO, 1480 }; 1481 1482 if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) { 1483 error_report("Failed to create KVM VFIO device: %m"); 1484 return; 1485 } 1486 1487 vfio_kvm_device_fd = cd.fd; 1488 } 1489 1490 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 1491 error_report("Failed to add group %d to KVM VFIO device: %m", 1492 group->groupid); 1493 } 1494 #endif 1495 } 1496 1497 static void vfio_kvm_device_del_group(VFIOGroup *group) 1498 { 1499 #ifdef CONFIG_KVM 1500 struct kvm_device_attr attr = { 1501 .group = KVM_DEV_VFIO_GROUP, 1502 .attr = KVM_DEV_VFIO_GROUP_DEL, 1503 .addr = (uint64_t)(unsigned long)&group->fd, 1504 }; 1505 1506 if (vfio_kvm_device_fd < 0) { 1507 return; 1508 } 1509 1510 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 1511 error_report("Failed to remove group %d from KVM VFIO device: %m", 1512 group->groupid); 1513 } 1514 #endif 1515 } 1516 1517 static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as) 1518 { 1519 VFIOAddressSpace *space; 1520 1521 QLIST_FOREACH(space, &vfio_address_spaces, list) { 1522 if (space->as == as) { 1523 return space; 1524 } 1525 } 1526 1527 /* No suitable VFIOAddressSpace, create a new one */ 1528 space = g_malloc0(sizeof(*space)); 1529 space->as = as; 1530 QLIST_INIT(&space->containers); 1531 1532 QLIST_INSERT_HEAD(&vfio_address_spaces, space, list); 1533 1534 return space; 1535 } 1536 1537 static void vfio_put_address_space(VFIOAddressSpace *space) 1538 { 1539 if (QLIST_EMPTY(&space->containers)) { 1540 QLIST_REMOVE(space, list); 1541 g_free(space); 1542 } 1543 } 1544 1545 /* 1546 * vfio_get_iommu_type - selects the richest iommu_type (v2 first) 1547 */ 1548 static int vfio_get_iommu_type(VFIOContainer *container, 1549 Error **errp) 1550 { 1551 int iommu_types[] = { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU, 1552 VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU }; 1553 int i; 1554 1555 for (i = 0; i < ARRAY_SIZE(iommu_types); i++) { 1556 if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) { 1557 return iommu_types[i]; 1558 } 1559 } 1560 error_setg(errp, "No available IOMMU models"); 1561 return -EINVAL; 1562 } 1563 1564 static int vfio_init_container(VFIOContainer *container, int group_fd, 1565 Error **errp) 1566 { 1567 int iommu_type, ret; 1568 1569 iommu_type = vfio_get_iommu_type(container, errp); 1570 if (iommu_type < 0) { 1571 return iommu_type; 1572 } 1573 1574 ret = ioctl(group_fd, VFIO_GROUP_SET_CONTAINER, &container->fd); 1575 if (ret) { 1576 error_setg_errno(errp, errno, "Failed to set group container"); 1577 return -errno; 1578 } 1579 1580 while (ioctl(container->fd, VFIO_SET_IOMMU, iommu_type)) { 1581 if (iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 1582 /* 1583 * On sPAPR, despite the IOMMU subdriver always advertises v1 and 1584 * v2, the running platform may not support v2 and there is no 1585 * way to guess it until an IOMMU group gets added to the container. 1586 * So in case it fails with v2, try v1 as a fallback. 1587 */ 1588 iommu_type = VFIO_SPAPR_TCE_IOMMU; 1589 continue; 1590 } 1591 error_setg_errno(errp, errno, "Failed to set iommu for container"); 1592 return -errno; 1593 } 1594 1595 container->iommu_type = iommu_type; 1596 return 0; 1597 } 1598 1599 static int vfio_get_iommu_info(VFIOContainer *container, 1600 struct vfio_iommu_type1_info **info) 1601 { 1602 1603 size_t argsz = sizeof(struct vfio_iommu_type1_info); 1604 1605 *info = g_new0(struct vfio_iommu_type1_info, 1); 1606 again: 1607 (*info)->argsz = argsz; 1608 1609 if (ioctl(container->fd, VFIO_IOMMU_GET_INFO, *info)) { 1610 g_free(*info); 1611 *info = NULL; 1612 return -errno; 1613 } 1614 1615 if (((*info)->argsz > argsz)) { 1616 argsz = (*info)->argsz; 1617 *info = g_realloc(*info, argsz); 1618 goto again; 1619 } 1620 1621 return 0; 1622 } 1623 1624 static struct vfio_info_cap_header * 1625 vfio_get_iommu_info_cap(struct vfio_iommu_type1_info *info, uint16_t id) 1626 { 1627 struct vfio_info_cap_header *hdr; 1628 void *ptr = info; 1629 1630 if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) { 1631 return NULL; 1632 } 1633 1634 for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) { 1635 if (hdr->id == id) { 1636 return hdr; 1637 } 1638 } 1639 1640 return NULL; 1641 } 1642 1643 static void vfio_get_iommu_info_migration(VFIOContainer *container, 1644 struct vfio_iommu_type1_info *info) 1645 { 1646 struct vfio_info_cap_header *hdr; 1647 struct vfio_iommu_type1_info_cap_migration *cap_mig; 1648 1649 hdr = vfio_get_iommu_info_cap(info, VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION); 1650 if (!hdr) { 1651 return; 1652 } 1653 1654 cap_mig = container_of(hdr, struct vfio_iommu_type1_info_cap_migration, 1655 header); 1656 1657 /* 1658 * cpu_physical_memory_set_dirty_lebitmap() expects pages in bitmap of 1659 * TARGET_PAGE_SIZE to mark those dirty. 1660 */ 1661 if (cap_mig->pgsize_bitmap & TARGET_PAGE_SIZE) { 1662 container->dirty_pages_supported = true; 1663 container->max_dirty_bitmap_size = cap_mig->max_dirty_bitmap_size; 1664 container->dirty_pgsizes = cap_mig->pgsize_bitmap; 1665 } 1666 } 1667 1668 static int vfio_connect_container(VFIOGroup *group, AddressSpace *as, 1669 Error **errp) 1670 { 1671 VFIOContainer *container; 1672 int ret, fd; 1673 VFIOAddressSpace *space; 1674 1675 space = vfio_get_address_space(as); 1676 1677 /* 1678 * VFIO is currently incompatible with discarding of RAM insofar as the 1679 * madvise to purge (zap) the page from QEMU's address space does not 1680 * interact with the memory API and therefore leaves stale virtual to 1681 * physical mappings in the IOMMU if the page was previously pinned. We 1682 * therefore set discarding broken for each group added to a container, 1683 * whether the container is used individually or shared. This provides 1684 * us with options to allow devices within a group to opt-in and allow 1685 * discarding, so long as it is done consistently for a group (for instance 1686 * if the device is an mdev device where it is known that the host vendor 1687 * driver will never pin pages outside of the working set of the guest 1688 * driver, which would thus not be discarding candidates). 1689 * 1690 * The first opportunity to induce pinning occurs here where we attempt to 1691 * attach the group to existing containers within the AddressSpace. If any 1692 * pages are already zapped from the virtual address space, such as from 1693 * previous discards, new pinning will cause valid mappings to be 1694 * re-established. Likewise, when the overall MemoryListener for a new 1695 * container is registered, a replay of mappings within the AddressSpace 1696 * will occur, re-establishing any previously zapped pages as well. 1697 * 1698 * Especially virtio-balloon is currently only prevented from discarding 1699 * new memory, it will not yet set ram_block_discard_set_required() and 1700 * therefore, neither stops us here or deals with the sudden memory 1701 * consumption of inflated memory. 1702 */ 1703 ret = ram_block_discard_disable(true); 1704 if (ret) { 1705 error_setg_errno(errp, -ret, "Cannot set discarding of RAM broken"); 1706 return ret; 1707 } 1708 1709 QLIST_FOREACH(container, &space->containers, next) { 1710 if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) { 1711 group->container = container; 1712 QLIST_INSERT_HEAD(&container->group_list, group, container_next); 1713 vfio_kvm_device_add_group(group); 1714 return 0; 1715 } 1716 } 1717 1718 fd = qemu_open_old("/dev/vfio/vfio", O_RDWR); 1719 if (fd < 0) { 1720 error_setg_errno(errp, errno, "failed to open /dev/vfio/vfio"); 1721 ret = -errno; 1722 goto put_space_exit; 1723 } 1724 1725 ret = ioctl(fd, VFIO_GET_API_VERSION); 1726 if (ret != VFIO_API_VERSION) { 1727 error_setg(errp, "supported vfio version: %d, " 1728 "reported version: %d", VFIO_API_VERSION, ret); 1729 ret = -EINVAL; 1730 goto close_fd_exit; 1731 } 1732 1733 container = g_malloc0(sizeof(*container)); 1734 container->space = space; 1735 container->fd = fd; 1736 container->error = NULL; 1737 container->dirty_pages_supported = false; 1738 QLIST_INIT(&container->giommu_list); 1739 QLIST_INIT(&container->hostwin_list); 1740 1741 ret = vfio_init_container(container, group->fd, errp); 1742 if (ret) { 1743 goto free_container_exit; 1744 } 1745 1746 switch (container->iommu_type) { 1747 case VFIO_TYPE1v2_IOMMU: 1748 case VFIO_TYPE1_IOMMU: 1749 { 1750 struct vfio_iommu_type1_info *info; 1751 1752 /* 1753 * FIXME: This assumes that a Type1 IOMMU can map any 64-bit 1754 * IOVA whatsoever. That's not actually true, but the current 1755 * kernel interface doesn't tell us what it can map, and the 1756 * existing Type1 IOMMUs generally support any IOVA we're 1757 * going to actually try in practice. 1758 */ 1759 ret = vfio_get_iommu_info(container, &info); 1760 1761 if (ret || !(info->flags & VFIO_IOMMU_INFO_PGSIZES)) { 1762 /* Assume 4k IOVA page size */ 1763 info->iova_pgsizes = 4096; 1764 } 1765 vfio_host_win_add(container, 0, (hwaddr)-1, info->iova_pgsizes); 1766 container->pgsizes = info->iova_pgsizes; 1767 1768 if (!ret) { 1769 vfio_get_iommu_info_migration(container, info); 1770 } 1771 g_free(info); 1772 break; 1773 } 1774 case VFIO_SPAPR_TCE_v2_IOMMU: 1775 case VFIO_SPAPR_TCE_IOMMU: 1776 { 1777 struct vfio_iommu_spapr_tce_info info; 1778 bool v2 = container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU; 1779 1780 /* 1781 * The host kernel code implementing VFIO_IOMMU_DISABLE is called 1782 * when container fd is closed so we do not call it explicitly 1783 * in this file. 1784 */ 1785 if (!v2) { 1786 ret = ioctl(fd, VFIO_IOMMU_ENABLE); 1787 if (ret) { 1788 error_setg_errno(errp, errno, "failed to enable container"); 1789 ret = -errno; 1790 goto free_container_exit; 1791 } 1792 } else { 1793 container->prereg_listener = vfio_prereg_listener; 1794 1795 memory_listener_register(&container->prereg_listener, 1796 &address_space_memory); 1797 if (container->error) { 1798 memory_listener_unregister(&container->prereg_listener); 1799 ret = -1; 1800 error_propagate_prepend(errp, container->error, 1801 "RAM memory listener initialization failed: "); 1802 goto free_container_exit; 1803 } 1804 } 1805 1806 info.argsz = sizeof(info); 1807 ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info); 1808 if (ret) { 1809 error_setg_errno(errp, errno, 1810 "VFIO_IOMMU_SPAPR_TCE_GET_INFO failed"); 1811 ret = -errno; 1812 if (v2) { 1813 memory_listener_unregister(&container->prereg_listener); 1814 } 1815 goto free_container_exit; 1816 } 1817 1818 if (v2) { 1819 container->pgsizes = info.ddw.pgsizes; 1820 /* 1821 * There is a default window in just created container. 1822 * To make region_add/del simpler, we better remove this 1823 * window now and let those iommu_listener callbacks 1824 * create/remove them when needed. 1825 */ 1826 ret = vfio_spapr_remove_window(container, info.dma32_window_start); 1827 if (ret) { 1828 error_setg_errno(errp, -ret, 1829 "failed to remove existing window"); 1830 goto free_container_exit; 1831 } 1832 } else { 1833 /* The default table uses 4K pages */ 1834 container->pgsizes = 0x1000; 1835 vfio_host_win_add(container, info.dma32_window_start, 1836 info.dma32_window_start + 1837 info.dma32_window_size - 1, 1838 0x1000); 1839 } 1840 } 1841 } 1842 1843 vfio_kvm_device_add_group(group); 1844 1845 QLIST_INIT(&container->group_list); 1846 QLIST_INSERT_HEAD(&space->containers, container, next); 1847 1848 group->container = container; 1849 QLIST_INSERT_HEAD(&container->group_list, group, container_next); 1850 1851 container->listener = vfio_memory_listener; 1852 1853 memory_listener_register(&container->listener, container->space->as); 1854 1855 if (container->error) { 1856 ret = -1; 1857 error_propagate_prepend(errp, container->error, 1858 "memory listener initialization failed: "); 1859 goto listener_release_exit; 1860 } 1861 1862 container->initialized = true; 1863 1864 return 0; 1865 listener_release_exit: 1866 QLIST_REMOVE(group, container_next); 1867 QLIST_REMOVE(container, next); 1868 vfio_kvm_device_del_group(group); 1869 vfio_listener_release(container); 1870 1871 free_container_exit: 1872 g_free(container); 1873 1874 close_fd_exit: 1875 close(fd); 1876 1877 put_space_exit: 1878 ram_block_discard_disable(false); 1879 vfio_put_address_space(space); 1880 1881 return ret; 1882 } 1883 1884 static void vfio_disconnect_container(VFIOGroup *group) 1885 { 1886 VFIOContainer *container = group->container; 1887 1888 QLIST_REMOVE(group, container_next); 1889 group->container = NULL; 1890 1891 /* 1892 * Explicitly release the listener first before unset container, 1893 * since unset may destroy the backend container if it's the last 1894 * group. 1895 */ 1896 if (QLIST_EMPTY(&container->group_list)) { 1897 vfio_listener_release(container); 1898 } 1899 1900 if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) { 1901 error_report("vfio: error disconnecting group %d from container", 1902 group->groupid); 1903 } 1904 1905 if (QLIST_EMPTY(&container->group_list)) { 1906 VFIOAddressSpace *space = container->space; 1907 VFIOGuestIOMMU *giommu, *tmp; 1908 1909 QLIST_REMOVE(container, next); 1910 1911 QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) { 1912 memory_region_unregister_iommu_notifier( 1913 MEMORY_REGION(giommu->iommu), &giommu->n); 1914 QLIST_REMOVE(giommu, giommu_next); 1915 g_free(giommu); 1916 } 1917 1918 trace_vfio_disconnect_container(container->fd); 1919 close(container->fd); 1920 g_free(container); 1921 1922 vfio_put_address_space(space); 1923 } 1924 } 1925 1926 VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp) 1927 { 1928 VFIOGroup *group; 1929 char path[32]; 1930 struct vfio_group_status status = { .argsz = sizeof(status) }; 1931 1932 QLIST_FOREACH(group, &vfio_group_list, next) { 1933 if (group->groupid == groupid) { 1934 /* Found it. Now is it already in the right context? */ 1935 if (group->container->space->as == as) { 1936 return group; 1937 } else { 1938 error_setg(errp, "group %d used in multiple address spaces", 1939 group->groupid); 1940 return NULL; 1941 } 1942 } 1943 } 1944 1945 group = g_malloc0(sizeof(*group)); 1946 1947 snprintf(path, sizeof(path), "/dev/vfio/%d", groupid); 1948 group->fd = qemu_open_old(path, O_RDWR); 1949 if (group->fd < 0) { 1950 error_setg_errno(errp, errno, "failed to open %s", path); 1951 goto free_group_exit; 1952 } 1953 1954 if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) { 1955 error_setg_errno(errp, errno, "failed to get group %d status", groupid); 1956 goto close_fd_exit; 1957 } 1958 1959 if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) { 1960 error_setg(errp, "group %d is not viable", groupid); 1961 error_append_hint(errp, 1962 "Please ensure all devices within the iommu_group " 1963 "are bound to their vfio bus driver.\n"); 1964 goto close_fd_exit; 1965 } 1966 1967 group->groupid = groupid; 1968 QLIST_INIT(&group->device_list); 1969 1970 if (vfio_connect_container(group, as, errp)) { 1971 error_prepend(errp, "failed to setup container for group %d: ", 1972 groupid); 1973 goto close_fd_exit; 1974 } 1975 1976 if (QLIST_EMPTY(&vfio_group_list)) { 1977 qemu_register_reset(vfio_reset_handler, NULL); 1978 } 1979 1980 QLIST_INSERT_HEAD(&vfio_group_list, group, next); 1981 1982 return group; 1983 1984 close_fd_exit: 1985 close(group->fd); 1986 1987 free_group_exit: 1988 g_free(group); 1989 1990 return NULL; 1991 } 1992 1993 void vfio_put_group(VFIOGroup *group) 1994 { 1995 if (!group || !QLIST_EMPTY(&group->device_list)) { 1996 return; 1997 } 1998 1999 if (!group->ram_block_discard_allowed) { 2000 ram_block_discard_disable(false); 2001 } 2002 vfio_kvm_device_del_group(group); 2003 vfio_disconnect_container(group); 2004 QLIST_REMOVE(group, next); 2005 trace_vfio_put_group(group->fd); 2006 close(group->fd); 2007 g_free(group); 2008 2009 if (QLIST_EMPTY(&vfio_group_list)) { 2010 qemu_unregister_reset(vfio_reset_handler, NULL); 2011 } 2012 } 2013 2014 int vfio_get_device(VFIOGroup *group, const char *name, 2015 VFIODevice *vbasedev, Error **errp) 2016 { 2017 struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) }; 2018 int ret, fd; 2019 2020 fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name); 2021 if (fd < 0) { 2022 error_setg_errno(errp, errno, "error getting device from group %d", 2023 group->groupid); 2024 error_append_hint(errp, 2025 "Verify all devices in group %d are bound to vfio-<bus> " 2026 "or pci-stub and not already in use\n", group->groupid); 2027 return fd; 2028 } 2029 2030 ret = ioctl(fd, VFIO_DEVICE_GET_INFO, &dev_info); 2031 if (ret) { 2032 error_setg_errno(errp, errno, "error getting device info"); 2033 close(fd); 2034 return ret; 2035 } 2036 2037 /* 2038 * Set discarding of RAM as not broken for this group if the driver knows 2039 * the device operates compatibly with discarding. Setting must be 2040 * consistent per group, but since compatibility is really only possible 2041 * with mdev currently, we expect singleton groups. 2042 */ 2043 if (vbasedev->ram_block_discard_allowed != 2044 group->ram_block_discard_allowed) { 2045 if (!QLIST_EMPTY(&group->device_list)) { 2046 error_setg(errp, "Inconsistent setting of support for discarding " 2047 "RAM (e.g., balloon) within group"); 2048 close(fd); 2049 return -1; 2050 } 2051 2052 if (!group->ram_block_discard_allowed) { 2053 group->ram_block_discard_allowed = true; 2054 ram_block_discard_disable(false); 2055 } 2056 } 2057 2058 vbasedev->fd = fd; 2059 vbasedev->group = group; 2060 QLIST_INSERT_HEAD(&group->device_list, vbasedev, next); 2061 2062 vbasedev->num_irqs = dev_info.num_irqs; 2063 vbasedev->num_regions = dev_info.num_regions; 2064 vbasedev->flags = dev_info.flags; 2065 2066 trace_vfio_get_device(name, dev_info.flags, dev_info.num_regions, 2067 dev_info.num_irqs); 2068 2069 vbasedev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET); 2070 return 0; 2071 } 2072 2073 void vfio_put_base_device(VFIODevice *vbasedev) 2074 { 2075 if (!vbasedev->group) { 2076 return; 2077 } 2078 QLIST_REMOVE(vbasedev, next); 2079 vbasedev->group = NULL; 2080 trace_vfio_put_base_device(vbasedev->fd); 2081 close(vbasedev->fd); 2082 } 2083 2084 int vfio_get_region_info(VFIODevice *vbasedev, int index, 2085 struct vfio_region_info **info) 2086 { 2087 size_t argsz = sizeof(struct vfio_region_info); 2088 2089 *info = g_malloc0(argsz); 2090 2091 (*info)->index = index; 2092 retry: 2093 (*info)->argsz = argsz; 2094 2095 if (ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, *info)) { 2096 g_free(*info); 2097 *info = NULL; 2098 return -errno; 2099 } 2100 2101 if ((*info)->argsz > argsz) { 2102 argsz = (*info)->argsz; 2103 *info = g_realloc(*info, argsz); 2104 2105 goto retry; 2106 } 2107 2108 return 0; 2109 } 2110 2111 int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t type, 2112 uint32_t subtype, struct vfio_region_info **info) 2113 { 2114 int i; 2115 2116 for (i = 0; i < vbasedev->num_regions; i++) { 2117 struct vfio_info_cap_header *hdr; 2118 struct vfio_region_info_cap_type *cap_type; 2119 2120 if (vfio_get_region_info(vbasedev, i, info)) { 2121 continue; 2122 } 2123 2124 hdr = vfio_get_region_info_cap(*info, VFIO_REGION_INFO_CAP_TYPE); 2125 if (!hdr) { 2126 g_free(*info); 2127 continue; 2128 } 2129 2130 cap_type = container_of(hdr, struct vfio_region_info_cap_type, header); 2131 2132 trace_vfio_get_dev_region(vbasedev->name, i, 2133 cap_type->type, cap_type->subtype); 2134 2135 if (cap_type->type == type && cap_type->subtype == subtype) { 2136 return 0; 2137 } 2138 2139 g_free(*info); 2140 } 2141 2142 *info = NULL; 2143 return -ENODEV; 2144 } 2145 2146 bool vfio_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_type) 2147 { 2148 struct vfio_region_info *info = NULL; 2149 bool ret = false; 2150 2151 if (!vfio_get_region_info(vbasedev, region, &info)) { 2152 if (vfio_get_region_info_cap(info, cap_type)) { 2153 ret = true; 2154 } 2155 g_free(info); 2156 } 2157 2158 return ret; 2159 } 2160 2161 /* 2162 * Interfaces for IBM EEH (Enhanced Error Handling) 2163 */ 2164 static bool vfio_eeh_container_ok(VFIOContainer *container) 2165 { 2166 /* 2167 * As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO 2168 * implementation is broken if there are multiple groups in a 2169 * container. The hardware works in units of Partitionable 2170 * Endpoints (== IOMMU groups) and the EEH operations naively 2171 * iterate across all groups in the container, without any logic 2172 * to make sure the groups have their state synchronized. For 2173 * certain operations (ENABLE) that might be ok, until an error 2174 * occurs, but for others (GET_STATE) it's clearly broken. 2175 */ 2176 2177 /* 2178 * XXX Once fixed kernels exist, test for them here 2179 */ 2180 2181 if (QLIST_EMPTY(&container->group_list)) { 2182 return false; 2183 } 2184 2185 if (QLIST_NEXT(QLIST_FIRST(&container->group_list), container_next)) { 2186 return false; 2187 } 2188 2189 return true; 2190 } 2191 2192 static int vfio_eeh_container_op(VFIOContainer *container, uint32_t op) 2193 { 2194 struct vfio_eeh_pe_op pe_op = { 2195 .argsz = sizeof(pe_op), 2196 .op = op, 2197 }; 2198 int ret; 2199 2200 if (!vfio_eeh_container_ok(container)) { 2201 error_report("vfio/eeh: EEH_PE_OP 0x%x: " 2202 "kernel requires a container with exactly one group", op); 2203 return -EPERM; 2204 } 2205 2206 ret = ioctl(container->fd, VFIO_EEH_PE_OP, &pe_op); 2207 if (ret < 0) { 2208 error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op); 2209 return -errno; 2210 } 2211 2212 return ret; 2213 } 2214 2215 static VFIOContainer *vfio_eeh_as_container(AddressSpace *as) 2216 { 2217 VFIOAddressSpace *space = vfio_get_address_space(as); 2218 VFIOContainer *container = NULL; 2219 2220 if (QLIST_EMPTY(&space->containers)) { 2221 /* No containers to act on */ 2222 goto out; 2223 } 2224 2225 container = QLIST_FIRST(&space->containers); 2226 2227 if (QLIST_NEXT(container, next)) { 2228 /* We don't yet have logic to synchronize EEH state across 2229 * multiple containers */ 2230 container = NULL; 2231 goto out; 2232 } 2233 2234 out: 2235 vfio_put_address_space(space); 2236 return container; 2237 } 2238 2239 bool vfio_eeh_as_ok(AddressSpace *as) 2240 { 2241 VFIOContainer *container = vfio_eeh_as_container(as); 2242 2243 return (container != NULL) && vfio_eeh_container_ok(container); 2244 } 2245 2246 int vfio_eeh_as_op(AddressSpace *as, uint32_t op) 2247 { 2248 VFIOContainer *container = vfio_eeh_as_container(as); 2249 2250 if (!container) { 2251 return -ENODEV; 2252 } 2253 return vfio_eeh_container_op(container, op); 2254 } 2255