1 /* 2 * vhost support 3 * 4 * Copyright Red Hat, Inc. 2010 5 * 6 * Authors: 7 * Michael S. Tsirkin <mst@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 * Contributions after 2012-01-13 are licensed under the terms of the 13 * GNU GPL, version 2 or (at your option) any later version. 14 */ 15 16 #include "qemu/osdep.h" 17 #include "qapi/error.h" 18 #include "hw/virtio/vhost.h" 19 #include "hw/hw.h" 20 #include "qemu/atomic.h" 21 #include "qemu/range.h" 22 #include "qemu/error-report.h" 23 #include "qemu/memfd.h" 24 #include <linux/vhost.h> 25 #include "exec/address-spaces.h" 26 #include "hw/virtio/virtio-bus.h" 27 #include "hw/virtio/virtio-access.h" 28 #include "migration/blocker.h" 29 #include "sysemu/dma.h" 30 31 /* enabled until disconnected backend stabilizes */ 32 #define _VHOST_DEBUG 1 33 34 #ifdef _VHOST_DEBUG 35 #define VHOST_OPS_DEBUG(fmt, ...) \ 36 do { error_report(fmt ": %s (%d)", ## __VA_ARGS__, \ 37 strerror(errno), errno); } while (0) 38 #else 39 #define VHOST_OPS_DEBUG(fmt, ...) \ 40 do { } while (0) 41 #endif 42 43 static struct vhost_log *vhost_log; 44 static struct vhost_log *vhost_log_shm; 45 46 static unsigned int used_memslots; 47 static QLIST_HEAD(, vhost_dev) vhost_devices = 48 QLIST_HEAD_INITIALIZER(vhost_devices); 49 50 bool vhost_has_free_slot(void) 51 { 52 unsigned int slots_limit = ~0U; 53 struct vhost_dev *hdev; 54 55 QLIST_FOREACH(hdev, &vhost_devices, entry) { 56 unsigned int r = hdev->vhost_ops->vhost_backend_memslots_limit(hdev); 57 slots_limit = MIN(slots_limit, r); 58 } 59 return slots_limit > used_memslots; 60 } 61 62 static void vhost_dev_sync_region(struct vhost_dev *dev, 63 MemoryRegionSection *section, 64 uint64_t mfirst, uint64_t mlast, 65 uint64_t rfirst, uint64_t rlast) 66 { 67 vhost_log_chunk_t *log = dev->log->log; 68 69 uint64_t start = MAX(mfirst, rfirst); 70 uint64_t end = MIN(mlast, rlast); 71 vhost_log_chunk_t *from = log + start / VHOST_LOG_CHUNK; 72 vhost_log_chunk_t *to = log + end / VHOST_LOG_CHUNK + 1; 73 uint64_t addr = QEMU_ALIGN_DOWN(start, VHOST_LOG_CHUNK); 74 75 if (end < start) { 76 return; 77 } 78 assert(end / VHOST_LOG_CHUNK < dev->log_size); 79 assert(start / VHOST_LOG_CHUNK < dev->log_size); 80 81 for (;from < to; ++from) { 82 vhost_log_chunk_t log; 83 /* We first check with non-atomic: much cheaper, 84 * and we expect non-dirty to be the common case. */ 85 if (!*from) { 86 addr += VHOST_LOG_CHUNK; 87 continue; 88 } 89 /* Data must be read atomically. We don't really need barrier semantics 90 * but it's easier to use atomic_* than roll our own. */ 91 log = atomic_xchg(from, 0); 92 while (log) { 93 int bit = ctzl(log); 94 hwaddr page_addr; 95 hwaddr section_offset; 96 hwaddr mr_offset; 97 page_addr = addr + bit * VHOST_LOG_PAGE; 98 section_offset = page_addr - section->offset_within_address_space; 99 mr_offset = section_offset + section->offset_within_region; 100 memory_region_set_dirty(section->mr, mr_offset, VHOST_LOG_PAGE); 101 log &= ~(0x1ull << bit); 102 } 103 addr += VHOST_LOG_CHUNK; 104 } 105 } 106 107 static int vhost_sync_dirty_bitmap(struct vhost_dev *dev, 108 MemoryRegionSection *section, 109 hwaddr first, 110 hwaddr last) 111 { 112 int i; 113 hwaddr start_addr; 114 hwaddr end_addr; 115 116 if (!dev->log_enabled || !dev->started) { 117 return 0; 118 } 119 start_addr = section->offset_within_address_space; 120 end_addr = range_get_last(start_addr, int128_get64(section->size)); 121 start_addr = MAX(first, start_addr); 122 end_addr = MIN(last, end_addr); 123 124 for (i = 0; i < dev->mem->nregions; ++i) { 125 struct vhost_memory_region *reg = dev->mem->regions + i; 126 vhost_dev_sync_region(dev, section, start_addr, end_addr, 127 reg->guest_phys_addr, 128 range_get_last(reg->guest_phys_addr, 129 reg->memory_size)); 130 } 131 for (i = 0; i < dev->nvqs; ++i) { 132 struct vhost_virtqueue *vq = dev->vqs + i; 133 vhost_dev_sync_region(dev, section, start_addr, end_addr, vq->used_phys, 134 range_get_last(vq->used_phys, vq->used_size)); 135 } 136 return 0; 137 } 138 139 static void vhost_log_sync(MemoryListener *listener, 140 MemoryRegionSection *section) 141 { 142 struct vhost_dev *dev = container_of(listener, struct vhost_dev, 143 memory_listener); 144 vhost_sync_dirty_bitmap(dev, section, 0x0, ~0x0ULL); 145 } 146 147 static void vhost_log_sync_range(struct vhost_dev *dev, 148 hwaddr first, hwaddr last) 149 { 150 int i; 151 /* FIXME: this is N^2 in number of sections */ 152 for (i = 0; i < dev->n_mem_sections; ++i) { 153 MemoryRegionSection *section = &dev->mem_sections[i]; 154 vhost_sync_dirty_bitmap(dev, section, first, last); 155 } 156 } 157 158 static uint64_t vhost_get_log_size(struct vhost_dev *dev) 159 { 160 uint64_t log_size = 0; 161 int i; 162 for (i = 0; i < dev->mem->nregions; ++i) { 163 struct vhost_memory_region *reg = dev->mem->regions + i; 164 uint64_t last = range_get_last(reg->guest_phys_addr, 165 reg->memory_size); 166 log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); 167 } 168 for (i = 0; i < dev->nvqs; ++i) { 169 struct vhost_virtqueue *vq = dev->vqs + i; 170 uint64_t last = vq->used_phys + vq->used_size - 1; 171 log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); 172 } 173 return log_size; 174 } 175 176 static struct vhost_log *vhost_log_alloc(uint64_t size, bool share) 177 { 178 Error *err = NULL; 179 struct vhost_log *log; 180 uint64_t logsize = size * sizeof(*(log->log)); 181 int fd = -1; 182 183 log = g_new0(struct vhost_log, 1); 184 if (share) { 185 log->log = qemu_memfd_alloc("vhost-log", logsize, 186 F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL, 187 &fd, &err); 188 if (err) { 189 error_report_err(err); 190 g_free(log); 191 return NULL; 192 } 193 memset(log->log, 0, logsize); 194 } else { 195 log->log = g_malloc0(logsize); 196 } 197 198 log->size = size; 199 log->refcnt = 1; 200 log->fd = fd; 201 202 return log; 203 } 204 205 static struct vhost_log *vhost_log_get(uint64_t size, bool share) 206 { 207 struct vhost_log *log = share ? vhost_log_shm : vhost_log; 208 209 if (!log || log->size != size) { 210 log = vhost_log_alloc(size, share); 211 if (share) { 212 vhost_log_shm = log; 213 } else { 214 vhost_log = log; 215 } 216 } else { 217 ++log->refcnt; 218 } 219 220 return log; 221 } 222 223 static void vhost_log_put(struct vhost_dev *dev, bool sync) 224 { 225 struct vhost_log *log = dev->log; 226 227 if (!log) { 228 return; 229 } 230 231 --log->refcnt; 232 if (log->refcnt == 0) { 233 /* Sync only the range covered by the old log */ 234 if (dev->log_size && sync) { 235 vhost_log_sync_range(dev, 0, dev->log_size * VHOST_LOG_CHUNK - 1); 236 } 237 238 if (vhost_log == log) { 239 g_free(log->log); 240 vhost_log = NULL; 241 } else if (vhost_log_shm == log) { 242 qemu_memfd_free(log->log, log->size * sizeof(*(log->log)), 243 log->fd); 244 vhost_log_shm = NULL; 245 } 246 247 g_free(log); 248 } 249 250 dev->log = NULL; 251 dev->log_size = 0; 252 } 253 254 static bool vhost_dev_log_is_shared(struct vhost_dev *dev) 255 { 256 return dev->vhost_ops->vhost_requires_shm_log && 257 dev->vhost_ops->vhost_requires_shm_log(dev); 258 } 259 260 static inline void vhost_dev_log_resize(struct vhost_dev *dev, uint64_t size) 261 { 262 struct vhost_log *log = vhost_log_get(size, vhost_dev_log_is_shared(dev)); 263 uint64_t log_base = (uintptr_t)log->log; 264 int r; 265 266 /* inform backend of log switching, this must be done before 267 releasing the current log, to ensure no logging is lost */ 268 r = dev->vhost_ops->vhost_set_log_base(dev, log_base, log); 269 if (r < 0) { 270 VHOST_OPS_DEBUG("vhost_set_log_base failed"); 271 } 272 273 vhost_log_put(dev, true); 274 dev->log = log; 275 dev->log_size = size; 276 } 277 278 static int vhost_dev_has_iommu(struct vhost_dev *dev) 279 { 280 VirtIODevice *vdev = dev->vdev; 281 282 return virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM); 283 } 284 285 static void *vhost_memory_map(struct vhost_dev *dev, hwaddr addr, 286 hwaddr *plen, int is_write) 287 { 288 if (!vhost_dev_has_iommu(dev)) { 289 return cpu_physical_memory_map(addr, plen, is_write); 290 } else { 291 return (void *)(uintptr_t)addr; 292 } 293 } 294 295 static void vhost_memory_unmap(struct vhost_dev *dev, void *buffer, 296 hwaddr len, int is_write, 297 hwaddr access_len) 298 { 299 if (!vhost_dev_has_iommu(dev)) { 300 cpu_physical_memory_unmap(buffer, len, is_write, access_len); 301 } 302 } 303 304 static int vhost_verify_ring_part_mapping(void *ring_hva, 305 uint64_t ring_gpa, 306 uint64_t ring_size, 307 void *reg_hva, 308 uint64_t reg_gpa, 309 uint64_t reg_size) 310 { 311 uint64_t hva_ring_offset; 312 uint64_t ring_last = range_get_last(ring_gpa, ring_size); 313 uint64_t reg_last = range_get_last(reg_gpa, reg_size); 314 315 if (ring_last < reg_gpa || ring_gpa > reg_last) { 316 return 0; 317 } 318 /* check that whole ring's is mapped */ 319 if (ring_last > reg_last) { 320 return -ENOMEM; 321 } 322 /* check that ring's MemoryRegion wasn't replaced */ 323 hva_ring_offset = ring_gpa - reg_gpa; 324 if (ring_hva != reg_hva + hva_ring_offset) { 325 return -EBUSY; 326 } 327 328 return 0; 329 } 330 331 static int vhost_verify_ring_mappings(struct vhost_dev *dev, 332 void *reg_hva, 333 uint64_t reg_gpa, 334 uint64_t reg_size) 335 { 336 int i, j; 337 int r = 0; 338 const char *part_name[] = { 339 "descriptor table", 340 "available ring", 341 "used ring" 342 }; 343 344 for (i = 0; i < dev->nvqs; ++i) { 345 struct vhost_virtqueue *vq = dev->vqs + i; 346 347 j = 0; 348 r = vhost_verify_ring_part_mapping( 349 vq->desc, vq->desc_phys, vq->desc_size, 350 reg_hva, reg_gpa, reg_size); 351 if (r) { 352 break; 353 } 354 355 j++; 356 r = vhost_verify_ring_part_mapping( 357 vq->desc, vq->desc_phys, vq->desc_size, 358 reg_hva, reg_gpa, reg_size); 359 if (r) { 360 break; 361 } 362 363 j++; 364 r = vhost_verify_ring_part_mapping( 365 vq->desc, vq->desc_phys, vq->desc_size, 366 reg_hva, reg_gpa, reg_size); 367 if (r) { 368 break; 369 } 370 } 371 372 if (r == -ENOMEM) { 373 error_report("Unable to map %s for ring %d", part_name[j], i); 374 } else if (r == -EBUSY) { 375 error_report("%s relocated for ring %d", part_name[j], i); 376 } 377 return r; 378 } 379 380 static bool vhost_section(MemoryRegionSection *section) 381 { 382 return memory_region_is_ram(section->mr) && 383 !memory_region_is_rom(section->mr); 384 } 385 386 static void vhost_begin(MemoryListener *listener) 387 { 388 struct vhost_dev *dev = container_of(listener, struct vhost_dev, 389 memory_listener); 390 dev->tmp_sections = NULL; 391 dev->n_tmp_sections = 0; 392 } 393 394 static void vhost_commit(MemoryListener *listener) 395 { 396 struct vhost_dev *dev = container_of(listener, struct vhost_dev, 397 memory_listener); 398 MemoryRegionSection *old_sections; 399 int n_old_sections; 400 uint64_t log_size; 401 size_t regions_size; 402 int r; 403 int i; 404 bool changed = false; 405 406 /* Note we can be called before the device is started, but then 407 * starting the device calls set_mem_table, so we need to have 408 * built the data structures. 409 */ 410 old_sections = dev->mem_sections; 411 n_old_sections = dev->n_mem_sections; 412 dev->mem_sections = dev->tmp_sections; 413 dev->n_mem_sections = dev->n_tmp_sections; 414 415 if (dev->n_mem_sections != n_old_sections) { 416 changed = true; 417 } else { 418 /* Same size, lets check the contents */ 419 changed = n_old_sections && memcmp(dev->mem_sections, old_sections, 420 n_old_sections * sizeof(old_sections[0])) != 0; 421 } 422 423 trace_vhost_commit(dev->started, changed); 424 if (!changed) { 425 goto out; 426 } 427 428 /* Rebuild the regions list from the new sections list */ 429 regions_size = offsetof(struct vhost_memory, regions) + 430 dev->n_mem_sections * sizeof dev->mem->regions[0]; 431 dev->mem = g_realloc(dev->mem, regions_size); 432 dev->mem->nregions = dev->n_mem_sections; 433 used_memslots = dev->mem->nregions; 434 for (i = 0; i < dev->n_mem_sections; i++) { 435 struct vhost_memory_region *cur_vmr = dev->mem->regions + i; 436 struct MemoryRegionSection *mrs = dev->mem_sections + i; 437 438 cur_vmr->guest_phys_addr = mrs->offset_within_address_space; 439 cur_vmr->memory_size = int128_get64(mrs->size); 440 cur_vmr->userspace_addr = 441 (uintptr_t)memory_region_get_ram_ptr(mrs->mr) + 442 mrs->offset_within_region; 443 cur_vmr->flags_padding = 0; 444 } 445 446 if (!dev->started) { 447 goto out; 448 } 449 450 for (i = 0; i < dev->mem->nregions; i++) { 451 if (vhost_verify_ring_mappings(dev, 452 (void *)(uintptr_t)dev->mem->regions[i].userspace_addr, 453 dev->mem->regions[i].guest_phys_addr, 454 dev->mem->regions[i].memory_size)) { 455 error_report("Verify ring failure on region %d", i); 456 abort(); 457 } 458 } 459 460 if (!dev->log_enabled) { 461 r = dev->vhost_ops->vhost_set_mem_table(dev, dev->mem); 462 if (r < 0) { 463 VHOST_OPS_DEBUG("vhost_set_mem_table failed"); 464 } 465 goto out; 466 } 467 log_size = vhost_get_log_size(dev); 468 /* We allocate an extra 4K bytes to log, 469 * to reduce the * number of reallocations. */ 470 #define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log) 471 /* To log more, must increase log size before table update. */ 472 if (dev->log_size < log_size) { 473 vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER); 474 } 475 r = dev->vhost_ops->vhost_set_mem_table(dev, dev->mem); 476 if (r < 0) { 477 VHOST_OPS_DEBUG("vhost_set_mem_table failed"); 478 } 479 /* To log less, can only decrease log size after table update. */ 480 if (dev->log_size > log_size + VHOST_LOG_BUFFER) { 481 vhost_dev_log_resize(dev, log_size); 482 } 483 484 out: 485 /* Deref the old list of sections, this must happen _after_ the 486 * vhost_set_mem_table to ensure the client isn't still using the 487 * section we're about to unref. 488 */ 489 while (n_old_sections--) { 490 memory_region_unref(old_sections[n_old_sections].mr); 491 } 492 g_free(old_sections); 493 return; 494 } 495 496 /* Adds the section data to the tmp_section structure. 497 * It relies on the listener calling us in memory address order 498 * and for each region (via the _add and _nop methods) to 499 * join neighbours. 500 */ 501 static void vhost_region_add_section(struct vhost_dev *dev, 502 MemoryRegionSection *section) 503 { 504 bool need_add = true; 505 uint64_t mrs_size = int128_get64(section->size); 506 uint64_t mrs_gpa = section->offset_within_address_space; 507 uintptr_t mrs_host = (uintptr_t)memory_region_get_ram_ptr(section->mr) + 508 section->offset_within_region; 509 510 trace_vhost_region_add_section(section->mr->name, mrs_gpa, mrs_size, 511 mrs_host); 512 513 bool log_dirty = memory_region_get_dirty_log_mask(section->mr) & 514 ~(1 << DIRTY_MEMORY_MIGRATION); 515 if (log_dirty) { 516 return; 517 } 518 519 if (dev->n_tmp_sections) { 520 /* Since we already have at least one section, lets see if 521 * this extends it; since we're scanning in order, we only 522 * have to look at the last one, and the FlatView that calls 523 * us shouldn't have overlaps. 524 */ 525 MemoryRegionSection *prev_sec = dev->tmp_sections + 526 (dev->n_tmp_sections - 1); 527 uint64_t prev_gpa_start = prev_sec->offset_within_address_space; 528 uint64_t prev_size = int128_get64(prev_sec->size); 529 uint64_t prev_gpa_end = range_get_last(prev_gpa_start, prev_size); 530 uint64_t prev_host_start = 531 (uintptr_t)memory_region_get_ram_ptr(prev_sec->mr) + 532 prev_sec->offset_within_region; 533 uint64_t prev_host_end = range_get_last(prev_host_start, prev_size); 534 535 if (prev_gpa_end + 1 == mrs_gpa && 536 prev_host_end + 1 == mrs_host && 537 section->mr == prev_sec->mr && 538 (!dev->vhost_ops->vhost_backend_can_merge || 539 dev->vhost_ops->vhost_backend_can_merge(dev, 540 mrs_host, mrs_size, 541 prev_host_start, prev_size))) { 542 /* The two sections abut */ 543 need_add = false; 544 prev_sec->size = int128_add(prev_sec->size, section->size); 545 trace_vhost_region_add_section_abut(section->mr->name, 546 mrs_size + prev_size); 547 } 548 } 549 550 if (need_add) { 551 ++dev->n_tmp_sections; 552 dev->tmp_sections = g_renew(MemoryRegionSection, dev->tmp_sections, 553 dev->n_tmp_sections); 554 dev->tmp_sections[dev->n_tmp_sections - 1] = *section; 555 /* The flatview isn't stable and we don't use it, making it NULL 556 * means we can memcmp the list. 557 */ 558 dev->tmp_sections[dev->n_tmp_sections - 1].fv = NULL; 559 memory_region_ref(section->mr); 560 } 561 } 562 563 static void vhost_region_add(MemoryListener *listener, 564 MemoryRegionSection *section) 565 { 566 struct vhost_dev *dev = container_of(listener, struct vhost_dev, 567 memory_listener); 568 569 if (!vhost_section(section)) { 570 return; 571 } 572 vhost_region_add_section(dev, section); 573 } 574 575 /* Called on regions that have not changed */ 576 static void vhost_region_nop(MemoryListener *listener, 577 MemoryRegionSection *section) 578 { 579 struct vhost_dev *dev = container_of(listener, struct vhost_dev, 580 memory_listener); 581 582 if (!vhost_section(section)) { 583 return; 584 } 585 586 vhost_region_add_section(dev, section); 587 } 588 589 static void vhost_region_del(MemoryListener *listener, 590 MemoryRegionSection *section) 591 { 592 if (!vhost_section(section)) { 593 return; 594 } 595 596 } 597 598 static void vhost_iommu_unmap_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) 599 { 600 struct vhost_iommu *iommu = container_of(n, struct vhost_iommu, n); 601 struct vhost_dev *hdev = iommu->hdev; 602 hwaddr iova = iotlb->iova + iommu->iommu_offset; 603 604 if (vhost_backend_invalidate_device_iotlb(hdev, iova, 605 iotlb->addr_mask + 1)) { 606 error_report("Fail to invalidate device iotlb"); 607 } 608 } 609 610 static void vhost_iommu_region_add(MemoryListener *listener, 611 MemoryRegionSection *section) 612 { 613 struct vhost_dev *dev = container_of(listener, struct vhost_dev, 614 iommu_listener); 615 struct vhost_iommu *iommu; 616 Int128 end; 617 618 if (!memory_region_is_iommu(section->mr)) { 619 return; 620 } 621 622 iommu = g_malloc0(sizeof(*iommu)); 623 end = int128_add(int128_make64(section->offset_within_region), 624 section->size); 625 end = int128_sub(end, int128_one()); 626 iommu_notifier_init(&iommu->n, vhost_iommu_unmap_notify, 627 IOMMU_NOTIFIER_UNMAP, 628 section->offset_within_region, 629 int128_get64(end)); 630 iommu->mr = section->mr; 631 iommu->iommu_offset = section->offset_within_address_space - 632 section->offset_within_region; 633 iommu->hdev = dev; 634 memory_region_register_iommu_notifier(section->mr, &iommu->n); 635 QLIST_INSERT_HEAD(&dev->iommu_list, iommu, iommu_next); 636 /* TODO: can replay help performance here? */ 637 } 638 639 static void vhost_iommu_region_del(MemoryListener *listener, 640 MemoryRegionSection *section) 641 { 642 struct vhost_dev *dev = container_of(listener, struct vhost_dev, 643 iommu_listener); 644 struct vhost_iommu *iommu; 645 646 if (!memory_region_is_iommu(section->mr)) { 647 return; 648 } 649 650 QLIST_FOREACH(iommu, &dev->iommu_list, iommu_next) { 651 if (iommu->mr == section->mr && 652 iommu->n.start == section->offset_within_region) { 653 memory_region_unregister_iommu_notifier(iommu->mr, 654 &iommu->n); 655 QLIST_REMOVE(iommu, iommu_next); 656 g_free(iommu); 657 break; 658 } 659 } 660 } 661 662 static int vhost_virtqueue_set_addr(struct vhost_dev *dev, 663 struct vhost_virtqueue *vq, 664 unsigned idx, bool enable_log) 665 { 666 struct vhost_vring_addr addr = { 667 .index = idx, 668 .desc_user_addr = (uint64_t)(unsigned long)vq->desc, 669 .avail_user_addr = (uint64_t)(unsigned long)vq->avail, 670 .used_user_addr = (uint64_t)(unsigned long)vq->used, 671 .log_guest_addr = vq->used_phys, 672 .flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0, 673 }; 674 int r = dev->vhost_ops->vhost_set_vring_addr(dev, &addr); 675 if (r < 0) { 676 VHOST_OPS_DEBUG("vhost_set_vring_addr failed"); 677 return -errno; 678 } 679 return 0; 680 } 681 682 static int vhost_dev_set_features(struct vhost_dev *dev, 683 bool enable_log) 684 { 685 uint64_t features = dev->acked_features; 686 int r; 687 if (enable_log) { 688 features |= 0x1ULL << VHOST_F_LOG_ALL; 689 } 690 r = dev->vhost_ops->vhost_set_features(dev, features); 691 if (r < 0) { 692 VHOST_OPS_DEBUG("vhost_set_features failed"); 693 } 694 return r < 0 ? -errno : 0; 695 } 696 697 static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log) 698 { 699 int r, i, idx; 700 r = vhost_dev_set_features(dev, enable_log); 701 if (r < 0) { 702 goto err_features; 703 } 704 for (i = 0; i < dev->nvqs; ++i) { 705 idx = dev->vhost_ops->vhost_get_vq_index(dev, dev->vq_index + i); 706 r = vhost_virtqueue_set_addr(dev, dev->vqs + i, idx, 707 enable_log); 708 if (r < 0) { 709 goto err_vq; 710 } 711 } 712 return 0; 713 err_vq: 714 for (; i >= 0; --i) { 715 idx = dev->vhost_ops->vhost_get_vq_index(dev, dev->vq_index + i); 716 vhost_virtqueue_set_addr(dev, dev->vqs + i, idx, 717 dev->log_enabled); 718 } 719 vhost_dev_set_features(dev, dev->log_enabled); 720 err_features: 721 return r; 722 } 723 724 static int vhost_migration_log(MemoryListener *listener, int enable) 725 { 726 struct vhost_dev *dev = container_of(listener, struct vhost_dev, 727 memory_listener); 728 int r; 729 if (!!enable == dev->log_enabled) { 730 return 0; 731 } 732 if (!dev->started) { 733 dev->log_enabled = enable; 734 return 0; 735 } 736 if (!enable) { 737 r = vhost_dev_set_log(dev, false); 738 if (r < 0) { 739 return r; 740 } 741 vhost_log_put(dev, false); 742 } else { 743 vhost_dev_log_resize(dev, vhost_get_log_size(dev)); 744 r = vhost_dev_set_log(dev, true); 745 if (r < 0) { 746 return r; 747 } 748 } 749 dev->log_enabled = enable; 750 return 0; 751 } 752 753 static void vhost_log_global_start(MemoryListener *listener) 754 { 755 int r; 756 757 r = vhost_migration_log(listener, true); 758 if (r < 0) { 759 abort(); 760 } 761 } 762 763 static void vhost_log_global_stop(MemoryListener *listener) 764 { 765 int r; 766 767 r = vhost_migration_log(listener, false); 768 if (r < 0) { 769 abort(); 770 } 771 } 772 773 static void vhost_log_start(MemoryListener *listener, 774 MemoryRegionSection *section, 775 int old, int new) 776 { 777 /* FIXME: implement */ 778 } 779 780 static void vhost_log_stop(MemoryListener *listener, 781 MemoryRegionSection *section, 782 int old, int new) 783 { 784 /* FIXME: implement */ 785 } 786 787 /* The vhost driver natively knows how to handle the vrings of non 788 * cross-endian legacy devices and modern devices. Only legacy devices 789 * exposed to a bi-endian guest may require the vhost driver to use a 790 * specific endianness. 791 */ 792 static inline bool vhost_needs_vring_endian(VirtIODevice *vdev) 793 { 794 if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { 795 return false; 796 } 797 #ifdef HOST_WORDS_BIGENDIAN 798 return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_LITTLE; 799 #else 800 return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG; 801 #endif 802 } 803 804 static int vhost_virtqueue_set_vring_endian_legacy(struct vhost_dev *dev, 805 bool is_big_endian, 806 int vhost_vq_index) 807 { 808 struct vhost_vring_state s = { 809 .index = vhost_vq_index, 810 .num = is_big_endian 811 }; 812 813 if (!dev->vhost_ops->vhost_set_vring_endian(dev, &s)) { 814 return 0; 815 } 816 817 VHOST_OPS_DEBUG("vhost_set_vring_endian failed"); 818 if (errno == ENOTTY) { 819 error_report("vhost does not support cross-endian"); 820 return -ENOSYS; 821 } 822 823 return -errno; 824 } 825 826 static int vhost_memory_region_lookup(struct vhost_dev *hdev, 827 uint64_t gpa, uint64_t *uaddr, 828 uint64_t *len) 829 { 830 int i; 831 832 for (i = 0; i < hdev->mem->nregions; i++) { 833 struct vhost_memory_region *reg = hdev->mem->regions + i; 834 835 if (gpa >= reg->guest_phys_addr && 836 reg->guest_phys_addr + reg->memory_size > gpa) { 837 *uaddr = reg->userspace_addr + gpa - reg->guest_phys_addr; 838 *len = reg->guest_phys_addr + reg->memory_size - gpa; 839 return 0; 840 } 841 } 842 843 return -EFAULT; 844 } 845 846 int vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write) 847 { 848 IOMMUTLBEntry iotlb; 849 uint64_t uaddr, len; 850 int ret = -EFAULT; 851 852 rcu_read_lock(); 853 854 iotlb = address_space_get_iotlb_entry(dev->vdev->dma_as, 855 iova, write); 856 if (iotlb.target_as != NULL) { 857 ret = vhost_memory_region_lookup(dev, iotlb.translated_addr, 858 &uaddr, &len); 859 if (ret) { 860 error_report("Fail to lookup the translated address " 861 "%"PRIx64, iotlb.translated_addr); 862 goto out; 863 } 864 865 len = MIN(iotlb.addr_mask + 1, len); 866 iova = iova & ~iotlb.addr_mask; 867 868 ret = vhost_backend_update_device_iotlb(dev, iova, uaddr, 869 len, iotlb.perm); 870 if (ret) { 871 error_report("Fail to update device iotlb"); 872 goto out; 873 } 874 } 875 out: 876 rcu_read_unlock(); 877 878 return ret; 879 } 880 881 static int vhost_virtqueue_start(struct vhost_dev *dev, 882 struct VirtIODevice *vdev, 883 struct vhost_virtqueue *vq, 884 unsigned idx) 885 { 886 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); 887 VirtioBusState *vbus = VIRTIO_BUS(qbus); 888 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); 889 hwaddr s, l, a; 890 int r; 891 int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx); 892 struct vhost_vring_file file = { 893 .index = vhost_vq_index 894 }; 895 struct vhost_vring_state state = { 896 .index = vhost_vq_index 897 }; 898 struct VirtQueue *vvq = virtio_get_queue(vdev, idx); 899 900 901 vq->num = state.num = virtio_queue_get_num(vdev, idx); 902 r = dev->vhost_ops->vhost_set_vring_num(dev, &state); 903 if (r) { 904 VHOST_OPS_DEBUG("vhost_set_vring_num failed"); 905 return -errno; 906 } 907 908 state.num = virtio_queue_get_last_avail_idx(vdev, idx); 909 r = dev->vhost_ops->vhost_set_vring_base(dev, &state); 910 if (r) { 911 VHOST_OPS_DEBUG("vhost_set_vring_base failed"); 912 return -errno; 913 } 914 915 if (vhost_needs_vring_endian(vdev)) { 916 r = vhost_virtqueue_set_vring_endian_legacy(dev, 917 virtio_is_big_endian(vdev), 918 vhost_vq_index); 919 if (r) { 920 return -errno; 921 } 922 } 923 924 vq->desc_size = s = l = virtio_queue_get_desc_size(vdev, idx); 925 vq->desc_phys = a = virtio_queue_get_desc_addr(vdev, idx); 926 vq->desc = vhost_memory_map(dev, a, &l, 0); 927 if (!vq->desc || l != s) { 928 r = -ENOMEM; 929 goto fail_alloc_desc; 930 } 931 vq->avail_size = s = l = virtio_queue_get_avail_size(vdev, idx); 932 vq->avail_phys = a = virtio_queue_get_avail_addr(vdev, idx); 933 vq->avail = vhost_memory_map(dev, a, &l, 0); 934 if (!vq->avail || l != s) { 935 r = -ENOMEM; 936 goto fail_alloc_avail; 937 } 938 vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx); 939 vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx); 940 vq->used = vhost_memory_map(dev, a, &l, 1); 941 if (!vq->used || l != s) { 942 r = -ENOMEM; 943 goto fail_alloc_used; 944 } 945 946 r = vhost_virtqueue_set_addr(dev, vq, vhost_vq_index, dev->log_enabled); 947 if (r < 0) { 948 r = -errno; 949 goto fail_alloc; 950 } 951 952 file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq)); 953 r = dev->vhost_ops->vhost_set_vring_kick(dev, &file); 954 if (r) { 955 VHOST_OPS_DEBUG("vhost_set_vring_kick failed"); 956 r = -errno; 957 goto fail_kick; 958 } 959 960 /* Clear and discard previous events if any. */ 961 event_notifier_test_and_clear(&vq->masked_notifier); 962 963 /* Init vring in unmasked state, unless guest_notifier_mask 964 * will do it later. 965 */ 966 if (!vdev->use_guest_notifier_mask) { 967 /* TODO: check and handle errors. */ 968 vhost_virtqueue_mask(dev, vdev, idx, false); 969 } 970 971 if (k->query_guest_notifiers && 972 k->query_guest_notifiers(qbus->parent) && 973 virtio_queue_vector(vdev, idx) == VIRTIO_NO_VECTOR) { 974 file.fd = -1; 975 r = dev->vhost_ops->vhost_set_vring_call(dev, &file); 976 if (r) { 977 goto fail_vector; 978 } 979 } 980 981 return 0; 982 983 fail_vector: 984 fail_kick: 985 fail_alloc: 986 vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx), 987 0, 0); 988 fail_alloc_used: 989 vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx), 990 0, 0); 991 fail_alloc_avail: 992 vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx), 993 0, 0); 994 fail_alloc_desc: 995 return r; 996 } 997 998 static void vhost_virtqueue_stop(struct vhost_dev *dev, 999 struct VirtIODevice *vdev, 1000 struct vhost_virtqueue *vq, 1001 unsigned idx) 1002 { 1003 int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx); 1004 struct vhost_vring_state state = { 1005 .index = vhost_vq_index, 1006 }; 1007 int r; 1008 1009 r = dev->vhost_ops->vhost_get_vring_base(dev, &state); 1010 if (r < 0) { 1011 VHOST_OPS_DEBUG("vhost VQ %d ring restore failed: %d", idx, r); 1012 /* Connection to the backend is broken, so let's sync internal 1013 * last avail idx to the device used idx. 1014 */ 1015 virtio_queue_restore_last_avail_idx(vdev, idx); 1016 } else { 1017 virtio_queue_set_last_avail_idx(vdev, idx, state.num); 1018 } 1019 virtio_queue_invalidate_signalled_used(vdev, idx); 1020 virtio_queue_update_used_idx(vdev, idx); 1021 1022 /* In the cross-endian case, we need to reset the vring endianness to 1023 * native as legacy devices expect so by default. 1024 */ 1025 if (vhost_needs_vring_endian(vdev)) { 1026 vhost_virtqueue_set_vring_endian_legacy(dev, 1027 !virtio_is_big_endian(vdev), 1028 vhost_vq_index); 1029 } 1030 1031 vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx), 1032 1, virtio_queue_get_used_size(vdev, idx)); 1033 vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx), 1034 0, virtio_queue_get_avail_size(vdev, idx)); 1035 vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx), 1036 0, virtio_queue_get_desc_size(vdev, idx)); 1037 } 1038 1039 static void vhost_eventfd_add(MemoryListener *listener, 1040 MemoryRegionSection *section, 1041 bool match_data, uint64_t data, EventNotifier *e) 1042 { 1043 } 1044 1045 static void vhost_eventfd_del(MemoryListener *listener, 1046 MemoryRegionSection *section, 1047 bool match_data, uint64_t data, EventNotifier *e) 1048 { 1049 } 1050 1051 static int vhost_virtqueue_set_busyloop_timeout(struct vhost_dev *dev, 1052 int n, uint32_t timeout) 1053 { 1054 int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, n); 1055 struct vhost_vring_state state = { 1056 .index = vhost_vq_index, 1057 .num = timeout, 1058 }; 1059 int r; 1060 1061 if (!dev->vhost_ops->vhost_set_vring_busyloop_timeout) { 1062 return -EINVAL; 1063 } 1064 1065 r = dev->vhost_ops->vhost_set_vring_busyloop_timeout(dev, &state); 1066 if (r) { 1067 VHOST_OPS_DEBUG("vhost_set_vring_busyloop_timeout failed"); 1068 return r; 1069 } 1070 1071 return 0; 1072 } 1073 1074 static int vhost_virtqueue_init(struct vhost_dev *dev, 1075 struct vhost_virtqueue *vq, int n) 1076 { 1077 int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, n); 1078 struct vhost_vring_file file = { 1079 .index = vhost_vq_index, 1080 }; 1081 int r = event_notifier_init(&vq->masked_notifier, 0); 1082 if (r < 0) { 1083 return r; 1084 } 1085 1086 file.fd = event_notifier_get_fd(&vq->masked_notifier); 1087 r = dev->vhost_ops->vhost_set_vring_call(dev, &file); 1088 if (r) { 1089 VHOST_OPS_DEBUG("vhost_set_vring_call failed"); 1090 r = -errno; 1091 goto fail_call; 1092 } 1093 1094 vq->dev = dev; 1095 1096 return 0; 1097 fail_call: 1098 event_notifier_cleanup(&vq->masked_notifier); 1099 return r; 1100 } 1101 1102 static void vhost_virtqueue_cleanup(struct vhost_virtqueue *vq) 1103 { 1104 event_notifier_cleanup(&vq->masked_notifier); 1105 } 1106 1107 int vhost_dev_init(struct vhost_dev *hdev, void *opaque, 1108 VhostBackendType backend_type, uint32_t busyloop_timeout) 1109 { 1110 uint64_t features; 1111 int i, r, n_initialized_vqs = 0; 1112 Error *local_err = NULL; 1113 1114 hdev->vdev = NULL; 1115 hdev->migration_blocker = NULL; 1116 1117 r = vhost_set_backend_type(hdev, backend_type); 1118 assert(r >= 0); 1119 1120 r = hdev->vhost_ops->vhost_backend_init(hdev, opaque); 1121 if (r < 0) { 1122 goto fail; 1123 } 1124 1125 if (used_memslots > hdev->vhost_ops->vhost_backend_memslots_limit(hdev)) { 1126 error_report("vhost backend memory slots limit is less" 1127 " than current number of present memory slots"); 1128 r = -1; 1129 goto fail; 1130 } 1131 1132 r = hdev->vhost_ops->vhost_set_owner(hdev); 1133 if (r < 0) { 1134 VHOST_OPS_DEBUG("vhost_set_owner failed"); 1135 goto fail; 1136 } 1137 1138 r = hdev->vhost_ops->vhost_get_features(hdev, &features); 1139 if (r < 0) { 1140 VHOST_OPS_DEBUG("vhost_get_features failed"); 1141 goto fail; 1142 } 1143 1144 for (i = 0; i < hdev->nvqs; ++i, ++n_initialized_vqs) { 1145 r = vhost_virtqueue_init(hdev, hdev->vqs + i, hdev->vq_index + i); 1146 if (r < 0) { 1147 goto fail; 1148 } 1149 } 1150 1151 if (busyloop_timeout) { 1152 for (i = 0; i < hdev->nvqs; ++i) { 1153 r = vhost_virtqueue_set_busyloop_timeout(hdev, hdev->vq_index + i, 1154 busyloop_timeout); 1155 if (r < 0) { 1156 goto fail_busyloop; 1157 } 1158 } 1159 } 1160 1161 hdev->features = features; 1162 1163 hdev->memory_listener = (MemoryListener) { 1164 .begin = vhost_begin, 1165 .commit = vhost_commit, 1166 .region_add = vhost_region_add, 1167 .region_del = vhost_region_del, 1168 .region_nop = vhost_region_nop, 1169 .log_start = vhost_log_start, 1170 .log_stop = vhost_log_stop, 1171 .log_sync = vhost_log_sync, 1172 .log_global_start = vhost_log_global_start, 1173 .log_global_stop = vhost_log_global_stop, 1174 .eventfd_add = vhost_eventfd_add, 1175 .eventfd_del = vhost_eventfd_del, 1176 .priority = 10 1177 }; 1178 1179 hdev->iommu_listener = (MemoryListener) { 1180 .region_add = vhost_iommu_region_add, 1181 .region_del = vhost_iommu_region_del, 1182 }; 1183 1184 if (hdev->migration_blocker == NULL) { 1185 if (!(hdev->features & (0x1ULL << VHOST_F_LOG_ALL))) { 1186 error_setg(&hdev->migration_blocker, 1187 "Migration disabled: vhost lacks VHOST_F_LOG_ALL feature."); 1188 } else if (vhost_dev_log_is_shared(hdev) && !qemu_memfd_check()) { 1189 error_setg(&hdev->migration_blocker, 1190 "Migration disabled: failed to allocate shared memory"); 1191 } 1192 } 1193 1194 if (hdev->migration_blocker != NULL) { 1195 r = migrate_add_blocker(hdev->migration_blocker, &local_err); 1196 if (local_err) { 1197 error_report_err(local_err); 1198 error_free(hdev->migration_blocker); 1199 goto fail_busyloop; 1200 } 1201 } 1202 1203 hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions)); 1204 hdev->n_mem_sections = 0; 1205 hdev->mem_sections = NULL; 1206 hdev->log = NULL; 1207 hdev->log_size = 0; 1208 hdev->log_enabled = false; 1209 hdev->started = false; 1210 memory_listener_register(&hdev->memory_listener, &address_space_memory); 1211 QLIST_INSERT_HEAD(&vhost_devices, hdev, entry); 1212 return 0; 1213 1214 fail_busyloop: 1215 while (--i >= 0) { 1216 vhost_virtqueue_set_busyloop_timeout(hdev, hdev->vq_index + i, 0); 1217 } 1218 fail: 1219 hdev->nvqs = n_initialized_vqs; 1220 vhost_dev_cleanup(hdev); 1221 return r; 1222 } 1223 1224 void vhost_dev_cleanup(struct vhost_dev *hdev) 1225 { 1226 int i; 1227 1228 for (i = 0; i < hdev->nvqs; ++i) { 1229 vhost_virtqueue_cleanup(hdev->vqs + i); 1230 } 1231 if (hdev->mem) { 1232 /* those are only safe after successful init */ 1233 memory_listener_unregister(&hdev->memory_listener); 1234 QLIST_REMOVE(hdev, entry); 1235 } 1236 if (hdev->migration_blocker) { 1237 migrate_del_blocker(hdev->migration_blocker); 1238 error_free(hdev->migration_blocker); 1239 } 1240 g_free(hdev->mem); 1241 g_free(hdev->mem_sections); 1242 if (hdev->vhost_ops) { 1243 hdev->vhost_ops->vhost_backend_cleanup(hdev); 1244 } 1245 assert(!hdev->log); 1246 1247 memset(hdev, 0, sizeof(struct vhost_dev)); 1248 } 1249 1250 /* Stop processing guest IO notifications in qemu. 1251 * Start processing them in vhost in kernel. 1252 */ 1253 int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) 1254 { 1255 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); 1256 int i, r, e; 1257 1258 /* We will pass the notifiers to the kernel, make sure that QEMU 1259 * doesn't interfere. 1260 */ 1261 r = virtio_device_grab_ioeventfd(vdev); 1262 if (r < 0) { 1263 error_report("binding does not support host notifiers"); 1264 goto fail; 1265 } 1266 1267 for (i = 0; i < hdev->nvqs; ++i) { 1268 r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, 1269 true); 1270 if (r < 0) { 1271 error_report("vhost VQ %d notifier binding failed: %d", i, -r); 1272 goto fail_vq; 1273 } 1274 } 1275 1276 return 0; 1277 fail_vq: 1278 while (--i >= 0) { 1279 e = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, 1280 false); 1281 if (e < 0) { 1282 error_report("vhost VQ %d notifier cleanup error: %d", i, -r); 1283 } 1284 assert (e >= 0); 1285 virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i); 1286 } 1287 virtio_device_release_ioeventfd(vdev); 1288 fail: 1289 return r; 1290 } 1291 1292 /* Stop processing guest IO notifications in vhost. 1293 * Start processing them in qemu. 1294 * This might actually run the qemu handlers right away, 1295 * so virtio in qemu must be completely setup when this is called. 1296 */ 1297 void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) 1298 { 1299 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); 1300 int i, r; 1301 1302 for (i = 0; i < hdev->nvqs; ++i) { 1303 r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, 1304 false); 1305 if (r < 0) { 1306 error_report("vhost VQ %d notifier cleanup failed: %d", i, -r); 1307 } 1308 assert (r >= 0); 1309 virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i); 1310 } 1311 virtio_device_release_ioeventfd(vdev); 1312 } 1313 1314 /* Test and clear event pending status. 1315 * Should be called after unmask to avoid losing events. 1316 */ 1317 bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n) 1318 { 1319 struct vhost_virtqueue *vq = hdev->vqs + n - hdev->vq_index; 1320 assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); 1321 return event_notifier_test_and_clear(&vq->masked_notifier); 1322 } 1323 1324 /* Mask/unmask events from this vq. */ 1325 void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, 1326 bool mask) 1327 { 1328 struct VirtQueue *vvq = virtio_get_queue(vdev, n); 1329 int r, index = n - hdev->vq_index; 1330 struct vhost_vring_file file; 1331 1332 /* should only be called after backend is connected */ 1333 assert(hdev->vhost_ops); 1334 1335 if (mask) { 1336 assert(vdev->use_guest_notifier_mask); 1337 file.fd = event_notifier_get_fd(&hdev->vqs[index].masked_notifier); 1338 } else { 1339 file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq)); 1340 } 1341 1342 file.index = hdev->vhost_ops->vhost_get_vq_index(hdev, n); 1343 r = hdev->vhost_ops->vhost_set_vring_call(hdev, &file); 1344 if (r < 0) { 1345 VHOST_OPS_DEBUG("vhost_set_vring_call failed"); 1346 } 1347 } 1348 1349 uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits, 1350 uint64_t features) 1351 { 1352 const int *bit = feature_bits; 1353 while (*bit != VHOST_INVALID_FEATURE_BIT) { 1354 uint64_t bit_mask = (1ULL << *bit); 1355 if (!(hdev->features & bit_mask)) { 1356 features &= ~bit_mask; 1357 } 1358 bit++; 1359 } 1360 return features; 1361 } 1362 1363 void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits, 1364 uint64_t features) 1365 { 1366 const int *bit = feature_bits; 1367 while (*bit != VHOST_INVALID_FEATURE_BIT) { 1368 uint64_t bit_mask = (1ULL << *bit); 1369 if (features & bit_mask) { 1370 hdev->acked_features |= bit_mask; 1371 } 1372 bit++; 1373 } 1374 } 1375 1376 int vhost_dev_get_config(struct vhost_dev *hdev, uint8_t *config, 1377 uint32_t config_len) 1378 { 1379 assert(hdev->vhost_ops); 1380 1381 if (hdev->vhost_ops->vhost_get_config) { 1382 return hdev->vhost_ops->vhost_get_config(hdev, config, config_len); 1383 } 1384 1385 return -1; 1386 } 1387 1388 int vhost_dev_set_config(struct vhost_dev *hdev, const uint8_t *data, 1389 uint32_t offset, uint32_t size, uint32_t flags) 1390 { 1391 assert(hdev->vhost_ops); 1392 1393 if (hdev->vhost_ops->vhost_set_config) { 1394 return hdev->vhost_ops->vhost_set_config(hdev, data, offset, 1395 size, flags); 1396 } 1397 1398 return -1; 1399 } 1400 1401 void vhost_dev_set_config_notifier(struct vhost_dev *hdev, 1402 const VhostDevConfigOps *ops) 1403 { 1404 assert(hdev->vhost_ops); 1405 hdev->config_ops = ops; 1406 } 1407 1408 /* Host notifiers must be enabled at this point. */ 1409 int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev) 1410 { 1411 int i, r; 1412 1413 /* should only be called after backend is connected */ 1414 assert(hdev->vhost_ops); 1415 1416 hdev->started = true; 1417 hdev->vdev = vdev; 1418 1419 r = vhost_dev_set_features(hdev, hdev->log_enabled); 1420 if (r < 0) { 1421 goto fail_features; 1422 } 1423 1424 if (vhost_dev_has_iommu(hdev)) { 1425 memory_listener_register(&hdev->iommu_listener, vdev->dma_as); 1426 } 1427 1428 r = hdev->vhost_ops->vhost_set_mem_table(hdev, hdev->mem); 1429 if (r < 0) { 1430 VHOST_OPS_DEBUG("vhost_set_mem_table failed"); 1431 r = -errno; 1432 goto fail_mem; 1433 } 1434 for (i = 0; i < hdev->nvqs; ++i) { 1435 r = vhost_virtqueue_start(hdev, 1436 vdev, 1437 hdev->vqs + i, 1438 hdev->vq_index + i); 1439 if (r < 0) { 1440 goto fail_vq; 1441 } 1442 } 1443 1444 if (hdev->log_enabled) { 1445 uint64_t log_base; 1446 1447 hdev->log_size = vhost_get_log_size(hdev); 1448 hdev->log = vhost_log_get(hdev->log_size, 1449 vhost_dev_log_is_shared(hdev)); 1450 log_base = (uintptr_t)hdev->log->log; 1451 r = hdev->vhost_ops->vhost_set_log_base(hdev, 1452 hdev->log_size ? log_base : 0, 1453 hdev->log); 1454 if (r < 0) { 1455 VHOST_OPS_DEBUG("vhost_set_log_base failed"); 1456 r = -errno; 1457 goto fail_log; 1458 } 1459 } 1460 1461 if (vhost_dev_has_iommu(hdev)) { 1462 hdev->vhost_ops->vhost_set_iotlb_callback(hdev, true); 1463 1464 /* Update used ring information for IOTLB to work correctly, 1465 * vhost-kernel code requires for this.*/ 1466 for (i = 0; i < hdev->nvqs; ++i) { 1467 struct vhost_virtqueue *vq = hdev->vqs + i; 1468 vhost_device_iotlb_miss(hdev, vq->used_phys, true); 1469 } 1470 } 1471 return 0; 1472 fail_log: 1473 vhost_log_put(hdev, false); 1474 fail_vq: 1475 while (--i >= 0) { 1476 vhost_virtqueue_stop(hdev, 1477 vdev, 1478 hdev->vqs + i, 1479 hdev->vq_index + i); 1480 } 1481 i = hdev->nvqs; 1482 1483 fail_mem: 1484 fail_features: 1485 1486 hdev->started = false; 1487 return r; 1488 } 1489 1490 /* Host notifiers must be enabled at this point. */ 1491 void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev) 1492 { 1493 int i; 1494 1495 /* should only be called after backend is connected */ 1496 assert(hdev->vhost_ops); 1497 1498 for (i = 0; i < hdev->nvqs; ++i) { 1499 vhost_virtqueue_stop(hdev, 1500 vdev, 1501 hdev->vqs + i, 1502 hdev->vq_index + i); 1503 } 1504 1505 if (vhost_dev_has_iommu(hdev)) { 1506 hdev->vhost_ops->vhost_set_iotlb_callback(hdev, false); 1507 memory_listener_unregister(&hdev->iommu_listener); 1508 } 1509 vhost_log_put(hdev, true); 1510 hdev->started = false; 1511 hdev->vdev = NULL; 1512 } 1513 1514 int vhost_net_set_backend(struct vhost_dev *hdev, 1515 struct vhost_vring_file *file) 1516 { 1517 if (hdev->vhost_ops->vhost_net_set_backend) { 1518 return hdev->vhost_ops->vhost_net_set_backend(hdev, file); 1519 } 1520 1521 return -1; 1522 } 1523