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