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 if (vq->desc_phys == 0) { 349 continue; 350 } 351 352 j = 0; 353 r = vhost_verify_ring_part_mapping( 354 vq->desc, vq->desc_phys, vq->desc_size, 355 reg_hva, reg_gpa, reg_size); 356 if (r) { 357 break; 358 } 359 360 j++; 361 r = vhost_verify_ring_part_mapping( 362 vq->avail, vq->avail_phys, vq->avail_size, 363 reg_hva, reg_gpa, reg_size); 364 if (r) { 365 break; 366 } 367 368 j++; 369 r = vhost_verify_ring_part_mapping( 370 vq->used, vq->used_phys, vq->used_size, 371 reg_hva, reg_gpa, reg_size); 372 if (r) { 373 break; 374 } 375 } 376 377 if (r == -ENOMEM) { 378 error_report("Unable to map %s for ring %d", part_name[j], i); 379 } else if (r == -EBUSY) { 380 error_report("%s relocated for ring %d", part_name[j], i); 381 } 382 return r; 383 } 384 385 static bool vhost_section(MemoryRegionSection *section) 386 { 387 bool result; 388 bool log_dirty = memory_region_get_dirty_log_mask(section->mr) & 389 ~(1 << DIRTY_MEMORY_MIGRATION); 390 result = memory_region_is_ram(section->mr) && 391 !memory_region_is_rom(section->mr); 392 393 /* Vhost doesn't handle any block which is doing dirty-tracking other 394 * than migration; this typically fires on VGA areas. 395 */ 396 result &= !log_dirty; 397 398 trace_vhost_section(section->mr->name, result); 399 return result; 400 } 401 402 static void vhost_begin(MemoryListener *listener) 403 { 404 struct vhost_dev *dev = container_of(listener, struct vhost_dev, 405 memory_listener); 406 dev->tmp_sections = NULL; 407 dev->n_tmp_sections = 0; 408 } 409 410 static void vhost_commit(MemoryListener *listener) 411 { 412 struct vhost_dev *dev = container_of(listener, struct vhost_dev, 413 memory_listener); 414 MemoryRegionSection *old_sections; 415 int n_old_sections; 416 uint64_t log_size; 417 size_t regions_size; 418 int r; 419 int i; 420 bool changed = false; 421 422 /* Note we can be called before the device is started, but then 423 * starting the device calls set_mem_table, so we need to have 424 * built the data structures. 425 */ 426 old_sections = dev->mem_sections; 427 n_old_sections = dev->n_mem_sections; 428 dev->mem_sections = dev->tmp_sections; 429 dev->n_mem_sections = dev->n_tmp_sections; 430 431 if (dev->n_mem_sections != n_old_sections) { 432 changed = true; 433 } else { 434 /* Same size, lets check the contents */ 435 changed = n_old_sections && memcmp(dev->mem_sections, old_sections, 436 n_old_sections * sizeof(old_sections[0])) != 0; 437 } 438 439 trace_vhost_commit(dev->started, changed); 440 if (!changed) { 441 goto out; 442 } 443 444 /* Rebuild the regions list from the new sections list */ 445 regions_size = offsetof(struct vhost_memory, regions) + 446 dev->n_mem_sections * sizeof dev->mem->regions[0]; 447 dev->mem = g_realloc(dev->mem, regions_size); 448 dev->mem->nregions = dev->n_mem_sections; 449 used_memslots = dev->mem->nregions; 450 for (i = 0; i < dev->n_mem_sections; i++) { 451 struct vhost_memory_region *cur_vmr = dev->mem->regions + i; 452 struct MemoryRegionSection *mrs = dev->mem_sections + i; 453 454 cur_vmr->guest_phys_addr = mrs->offset_within_address_space; 455 cur_vmr->memory_size = int128_get64(mrs->size); 456 cur_vmr->userspace_addr = 457 (uintptr_t)memory_region_get_ram_ptr(mrs->mr) + 458 mrs->offset_within_region; 459 cur_vmr->flags_padding = 0; 460 } 461 462 if (!dev->started) { 463 goto out; 464 } 465 466 for (i = 0; i < dev->mem->nregions; i++) { 467 if (vhost_verify_ring_mappings(dev, 468 (void *)(uintptr_t)dev->mem->regions[i].userspace_addr, 469 dev->mem->regions[i].guest_phys_addr, 470 dev->mem->regions[i].memory_size)) { 471 error_report("Verify ring failure on region %d", i); 472 abort(); 473 } 474 } 475 476 if (!dev->log_enabled) { 477 r = dev->vhost_ops->vhost_set_mem_table(dev, dev->mem); 478 if (r < 0) { 479 VHOST_OPS_DEBUG("vhost_set_mem_table failed"); 480 } 481 goto out; 482 } 483 log_size = vhost_get_log_size(dev); 484 /* We allocate an extra 4K bytes to log, 485 * to reduce the * number of reallocations. */ 486 #define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log) 487 /* To log more, must increase log size before table update. */ 488 if (dev->log_size < log_size) { 489 vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER); 490 } 491 r = dev->vhost_ops->vhost_set_mem_table(dev, dev->mem); 492 if (r < 0) { 493 VHOST_OPS_DEBUG("vhost_set_mem_table failed"); 494 } 495 /* To log less, can only decrease log size after table update. */ 496 if (dev->log_size > log_size + VHOST_LOG_BUFFER) { 497 vhost_dev_log_resize(dev, log_size); 498 } 499 500 out: 501 /* Deref the old list of sections, this must happen _after_ the 502 * vhost_set_mem_table to ensure the client isn't still using the 503 * section we're about to unref. 504 */ 505 while (n_old_sections--) { 506 memory_region_unref(old_sections[n_old_sections].mr); 507 } 508 g_free(old_sections); 509 return; 510 } 511 512 /* Adds the section data to the tmp_section structure. 513 * It relies on the listener calling us in memory address order 514 * and for each region (via the _add and _nop methods) to 515 * join neighbours. 516 */ 517 static void vhost_region_add_section(struct vhost_dev *dev, 518 MemoryRegionSection *section) 519 { 520 bool need_add = true; 521 uint64_t mrs_size = int128_get64(section->size); 522 uint64_t mrs_gpa = section->offset_within_address_space; 523 uintptr_t mrs_host = (uintptr_t)memory_region_get_ram_ptr(section->mr) + 524 section->offset_within_region; 525 526 trace_vhost_region_add_section(section->mr->name, mrs_gpa, mrs_size, 527 mrs_host); 528 529 if (dev->n_tmp_sections) { 530 /* Since we already have at least one section, lets see if 531 * this extends it; since we're scanning in order, we only 532 * have to look at the last one, and the FlatView that calls 533 * us shouldn't have overlaps. 534 */ 535 MemoryRegionSection *prev_sec = dev->tmp_sections + 536 (dev->n_tmp_sections - 1); 537 uint64_t prev_gpa_start = prev_sec->offset_within_address_space; 538 uint64_t prev_size = int128_get64(prev_sec->size); 539 uint64_t prev_gpa_end = range_get_last(prev_gpa_start, prev_size); 540 uint64_t prev_host_start = 541 (uintptr_t)memory_region_get_ram_ptr(prev_sec->mr) + 542 prev_sec->offset_within_region; 543 uint64_t prev_host_end = range_get_last(prev_host_start, prev_size); 544 545 if (prev_gpa_end + 1 == mrs_gpa && 546 prev_host_end + 1 == mrs_host && 547 section->mr == prev_sec->mr && 548 (!dev->vhost_ops->vhost_backend_can_merge || 549 dev->vhost_ops->vhost_backend_can_merge(dev, 550 mrs_host, mrs_size, 551 prev_host_start, prev_size))) { 552 /* The two sections abut */ 553 need_add = false; 554 prev_sec->size = int128_add(prev_sec->size, section->size); 555 trace_vhost_region_add_section_abut(section->mr->name, 556 mrs_size + prev_size); 557 } 558 } 559 560 if (need_add) { 561 ++dev->n_tmp_sections; 562 dev->tmp_sections = g_renew(MemoryRegionSection, dev->tmp_sections, 563 dev->n_tmp_sections); 564 dev->tmp_sections[dev->n_tmp_sections - 1] = *section; 565 /* The flatview isn't stable and we don't use it, making it NULL 566 * means we can memcmp the list. 567 */ 568 dev->tmp_sections[dev->n_tmp_sections - 1].fv = NULL; 569 memory_region_ref(section->mr); 570 } 571 } 572 573 /* Used for both add and nop callbacks */ 574 static void vhost_region_addnop(MemoryListener *listener, 575 MemoryRegionSection *section) 576 { 577 struct vhost_dev *dev = container_of(listener, struct vhost_dev, 578 memory_listener); 579 580 if (!vhost_section(section)) { 581 return; 582 } 583 vhost_region_add_section(dev, section); 584 } 585 586 static void vhost_iommu_unmap_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) 587 { 588 struct vhost_iommu *iommu = container_of(n, struct vhost_iommu, n); 589 struct vhost_dev *hdev = iommu->hdev; 590 hwaddr iova = iotlb->iova + iommu->iommu_offset; 591 592 if (vhost_backend_invalidate_device_iotlb(hdev, iova, 593 iotlb->addr_mask + 1)) { 594 error_report("Fail to invalidate device iotlb"); 595 } 596 } 597 598 static void vhost_iommu_region_add(MemoryListener *listener, 599 MemoryRegionSection *section) 600 { 601 struct vhost_dev *dev = container_of(listener, struct vhost_dev, 602 iommu_listener); 603 struct vhost_iommu *iommu; 604 Int128 end; 605 606 if (!memory_region_is_iommu(section->mr)) { 607 return; 608 } 609 610 iommu = g_malloc0(sizeof(*iommu)); 611 end = int128_add(int128_make64(section->offset_within_region), 612 section->size); 613 end = int128_sub(end, int128_one()); 614 iommu_notifier_init(&iommu->n, vhost_iommu_unmap_notify, 615 IOMMU_NOTIFIER_UNMAP, 616 section->offset_within_region, 617 int128_get64(end)); 618 iommu->mr = section->mr; 619 iommu->iommu_offset = section->offset_within_address_space - 620 section->offset_within_region; 621 iommu->hdev = dev; 622 memory_region_register_iommu_notifier(section->mr, &iommu->n); 623 QLIST_INSERT_HEAD(&dev->iommu_list, iommu, iommu_next); 624 /* TODO: can replay help performance here? */ 625 } 626 627 static void vhost_iommu_region_del(MemoryListener *listener, 628 MemoryRegionSection *section) 629 { 630 struct vhost_dev *dev = container_of(listener, struct vhost_dev, 631 iommu_listener); 632 struct vhost_iommu *iommu; 633 634 if (!memory_region_is_iommu(section->mr)) { 635 return; 636 } 637 638 QLIST_FOREACH(iommu, &dev->iommu_list, iommu_next) { 639 if (iommu->mr == section->mr && 640 iommu->n.start == section->offset_within_region) { 641 memory_region_unregister_iommu_notifier(iommu->mr, 642 &iommu->n); 643 QLIST_REMOVE(iommu, iommu_next); 644 g_free(iommu); 645 break; 646 } 647 } 648 } 649 650 static int vhost_virtqueue_set_addr(struct vhost_dev *dev, 651 struct vhost_virtqueue *vq, 652 unsigned idx, bool enable_log) 653 { 654 struct vhost_vring_addr addr = { 655 .index = idx, 656 .desc_user_addr = (uint64_t)(unsigned long)vq->desc, 657 .avail_user_addr = (uint64_t)(unsigned long)vq->avail, 658 .used_user_addr = (uint64_t)(unsigned long)vq->used, 659 .log_guest_addr = vq->used_phys, 660 .flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0, 661 }; 662 int r = dev->vhost_ops->vhost_set_vring_addr(dev, &addr); 663 if (r < 0) { 664 VHOST_OPS_DEBUG("vhost_set_vring_addr failed"); 665 return -errno; 666 } 667 return 0; 668 } 669 670 static int vhost_dev_set_features(struct vhost_dev *dev, 671 bool enable_log) 672 { 673 uint64_t features = dev->acked_features; 674 int r; 675 if (enable_log) { 676 features |= 0x1ULL << VHOST_F_LOG_ALL; 677 } 678 r = dev->vhost_ops->vhost_set_features(dev, features); 679 if (r < 0) { 680 VHOST_OPS_DEBUG("vhost_set_features failed"); 681 } 682 return r < 0 ? -errno : 0; 683 } 684 685 static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log) 686 { 687 int r, i, idx; 688 r = vhost_dev_set_features(dev, enable_log); 689 if (r < 0) { 690 goto err_features; 691 } 692 for (i = 0; i < dev->nvqs; ++i) { 693 idx = dev->vhost_ops->vhost_get_vq_index(dev, dev->vq_index + i); 694 r = vhost_virtqueue_set_addr(dev, dev->vqs + i, idx, 695 enable_log); 696 if (r < 0) { 697 goto err_vq; 698 } 699 } 700 return 0; 701 err_vq: 702 for (; i >= 0; --i) { 703 idx = dev->vhost_ops->vhost_get_vq_index(dev, dev->vq_index + i); 704 vhost_virtqueue_set_addr(dev, dev->vqs + i, idx, 705 dev->log_enabled); 706 } 707 vhost_dev_set_features(dev, dev->log_enabled); 708 err_features: 709 return r; 710 } 711 712 static int vhost_migration_log(MemoryListener *listener, int enable) 713 { 714 struct vhost_dev *dev = container_of(listener, struct vhost_dev, 715 memory_listener); 716 int r; 717 if (!!enable == dev->log_enabled) { 718 return 0; 719 } 720 if (!dev->started) { 721 dev->log_enabled = enable; 722 return 0; 723 } 724 if (!enable) { 725 r = vhost_dev_set_log(dev, false); 726 if (r < 0) { 727 return r; 728 } 729 vhost_log_put(dev, false); 730 } else { 731 vhost_dev_log_resize(dev, vhost_get_log_size(dev)); 732 r = vhost_dev_set_log(dev, true); 733 if (r < 0) { 734 return r; 735 } 736 } 737 dev->log_enabled = enable; 738 return 0; 739 } 740 741 static void vhost_log_global_start(MemoryListener *listener) 742 { 743 int r; 744 745 r = vhost_migration_log(listener, true); 746 if (r < 0) { 747 abort(); 748 } 749 } 750 751 static void vhost_log_global_stop(MemoryListener *listener) 752 { 753 int r; 754 755 r = vhost_migration_log(listener, false); 756 if (r < 0) { 757 abort(); 758 } 759 } 760 761 static void vhost_log_start(MemoryListener *listener, 762 MemoryRegionSection *section, 763 int old, int new) 764 { 765 /* FIXME: implement */ 766 } 767 768 static void vhost_log_stop(MemoryListener *listener, 769 MemoryRegionSection *section, 770 int old, int new) 771 { 772 /* FIXME: implement */ 773 } 774 775 /* The vhost driver natively knows how to handle the vrings of non 776 * cross-endian legacy devices and modern devices. Only legacy devices 777 * exposed to a bi-endian guest may require the vhost driver to use a 778 * specific endianness. 779 */ 780 static inline bool vhost_needs_vring_endian(VirtIODevice *vdev) 781 { 782 if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { 783 return false; 784 } 785 #ifdef HOST_WORDS_BIGENDIAN 786 return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_LITTLE; 787 #else 788 return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG; 789 #endif 790 } 791 792 static int vhost_virtqueue_set_vring_endian_legacy(struct vhost_dev *dev, 793 bool is_big_endian, 794 int vhost_vq_index) 795 { 796 struct vhost_vring_state s = { 797 .index = vhost_vq_index, 798 .num = is_big_endian 799 }; 800 801 if (!dev->vhost_ops->vhost_set_vring_endian(dev, &s)) { 802 return 0; 803 } 804 805 VHOST_OPS_DEBUG("vhost_set_vring_endian failed"); 806 if (errno == ENOTTY) { 807 error_report("vhost does not support cross-endian"); 808 return -ENOSYS; 809 } 810 811 return -errno; 812 } 813 814 static int vhost_memory_region_lookup(struct vhost_dev *hdev, 815 uint64_t gpa, uint64_t *uaddr, 816 uint64_t *len) 817 { 818 int i; 819 820 for (i = 0; i < hdev->mem->nregions; i++) { 821 struct vhost_memory_region *reg = hdev->mem->regions + i; 822 823 if (gpa >= reg->guest_phys_addr && 824 reg->guest_phys_addr + reg->memory_size > gpa) { 825 *uaddr = reg->userspace_addr + gpa - reg->guest_phys_addr; 826 *len = reg->guest_phys_addr + reg->memory_size - gpa; 827 return 0; 828 } 829 } 830 831 return -EFAULT; 832 } 833 834 int vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write) 835 { 836 IOMMUTLBEntry iotlb; 837 uint64_t uaddr, len; 838 int ret = -EFAULT; 839 840 rcu_read_lock(); 841 842 iotlb = address_space_get_iotlb_entry(dev->vdev->dma_as, 843 iova, write); 844 if (iotlb.target_as != NULL) { 845 ret = vhost_memory_region_lookup(dev, iotlb.translated_addr, 846 &uaddr, &len); 847 if (ret) { 848 error_report("Fail to lookup the translated address " 849 "%"PRIx64, iotlb.translated_addr); 850 goto out; 851 } 852 853 len = MIN(iotlb.addr_mask + 1, len); 854 iova = iova & ~iotlb.addr_mask; 855 856 ret = vhost_backend_update_device_iotlb(dev, iova, uaddr, 857 len, iotlb.perm); 858 if (ret) { 859 error_report("Fail to update device iotlb"); 860 goto out; 861 } 862 } 863 out: 864 rcu_read_unlock(); 865 866 return ret; 867 } 868 869 static int vhost_virtqueue_start(struct vhost_dev *dev, 870 struct VirtIODevice *vdev, 871 struct vhost_virtqueue *vq, 872 unsigned idx) 873 { 874 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); 875 VirtioBusState *vbus = VIRTIO_BUS(qbus); 876 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); 877 hwaddr s, l, a; 878 int r; 879 int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx); 880 struct vhost_vring_file file = { 881 .index = vhost_vq_index 882 }; 883 struct vhost_vring_state state = { 884 .index = vhost_vq_index 885 }; 886 struct VirtQueue *vvq = virtio_get_queue(vdev, idx); 887 888 a = virtio_queue_get_desc_addr(vdev, idx); 889 if (a == 0) { 890 /* Queue might not be ready for start */ 891 return 0; 892 } 893 894 vq->num = state.num = virtio_queue_get_num(vdev, idx); 895 r = dev->vhost_ops->vhost_set_vring_num(dev, &state); 896 if (r) { 897 VHOST_OPS_DEBUG("vhost_set_vring_num failed"); 898 return -errno; 899 } 900 901 state.num = virtio_queue_get_last_avail_idx(vdev, idx); 902 r = dev->vhost_ops->vhost_set_vring_base(dev, &state); 903 if (r) { 904 VHOST_OPS_DEBUG("vhost_set_vring_base failed"); 905 return -errno; 906 } 907 908 if (vhost_needs_vring_endian(vdev)) { 909 r = vhost_virtqueue_set_vring_endian_legacy(dev, 910 virtio_is_big_endian(vdev), 911 vhost_vq_index); 912 if (r) { 913 return -errno; 914 } 915 } 916 917 vq->desc_size = s = l = virtio_queue_get_desc_size(vdev, idx); 918 vq->desc_phys = a; 919 vq->desc = vhost_memory_map(dev, a, &l, 0); 920 if (!vq->desc || l != s) { 921 r = -ENOMEM; 922 goto fail_alloc_desc; 923 } 924 vq->avail_size = s = l = virtio_queue_get_avail_size(vdev, idx); 925 vq->avail_phys = a = virtio_queue_get_avail_addr(vdev, idx); 926 vq->avail = vhost_memory_map(dev, a, &l, 0); 927 if (!vq->avail || l != s) { 928 r = -ENOMEM; 929 goto fail_alloc_avail; 930 } 931 vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx); 932 vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx); 933 vq->used = vhost_memory_map(dev, a, &l, 1); 934 if (!vq->used || l != s) { 935 r = -ENOMEM; 936 goto fail_alloc_used; 937 } 938 939 r = vhost_virtqueue_set_addr(dev, vq, vhost_vq_index, dev->log_enabled); 940 if (r < 0) { 941 r = -errno; 942 goto fail_alloc; 943 } 944 945 file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq)); 946 r = dev->vhost_ops->vhost_set_vring_kick(dev, &file); 947 if (r) { 948 VHOST_OPS_DEBUG("vhost_set_vring_kick failed"); 949 r = -errno; 950 goto fail_kick; 951 } 952 953 /* Clear and discard previous events if any. */ 954 event_notifier_test_and_clear(&vq->masked_notifier); 955 956 /* Init vring in unmasked state, unless guest_notifier_mask 957 * will do it later. 958 */ 959 if (!vdev->use_guest_notifier_mask) { 960 /* TODO: check and handle errors. */ 961 vhost_virtqueue_mask(dev, vdev, idx, false); 962 } 963 964 if (k->query_guest_notifiers && 965 k->query_guest_notifiers(qbus->parent) && 966 virtio_queue_vector(vdev, idx) == VIRTIO_NO_VECTOR) { 967 file.fd = -1; 968 r = dev->vhost_ops->vhost_set_vring_call(dev, &file); 969 if (r) { 970 goto fail_vector; 971 } 972 } 973 974 return 0; 975 976 fail_vector: 977 fail_kick: 978 fail_alloc: 979 vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx), 980 0, 0); 981 fail_alloc_used: 982 vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx), 983 0, 0); 984 fail_alloc_avail: 985 vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx), 986 0, 0); 987 fail_alloc_desc: 988 return r; 989 } 990 991 static void vhost_virtqueue_stop(struct vhost_dev *dev, 992 struct VirtIODevice *vdev, 993 struct vhost_virtqueue *vq, 994 unsigned idx) 995 { 996 int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx); 997 struct vhost_vring_state state = { 998 .index = vhost_vq_index, 999 }; 1000 int r; 1001 int a; 1002 1003 a = virtio_queue_get_desc_addr(vdev, idx); 1004 if (a == 0) { 1005 /* Don't stop the virtqueue which might have not been started */ 1006 return; 1007 } 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 r = hdev->vhost_ops->vhost_set_owner(hdev); 1126 if (r < 0) { 1127 VHOST_OPS_DEBUG("vhost_set_owner failed"); 1128 goto fail; 1129 } 1130 1131 r = hdev->vhost_ops->vhost_get_features(hdev, &features); 1132 if (r < 0) { 1133 VHOST_OPS_DEBUG("vhost_get_features failed"); 1134 goto fail; 1135 } 1136 1137 for (i = 0; i < hdev->nvqs; ++i, ++n_initialized_vqs) { 1138 r = vhost_virtqueue_init(hdev, hdev->vqs + i, hdev->vq_index + i); 1139 if (r < 0) { 1140 goto fail; 1141 } 1142 } 1143 1144 if (busyloop_timeout) { 1145 for (i = 0; i < hdev->nvqs; ++i) { 1146 r = vhost_virtqueue_set_busyloop_timeout(hdev, hdev->vq_index + i, 1147 busyloop_timeout); 1148 if (r < 0) { 1149 goto fail_busyloop; 1150 } 1151 } 1152 } 1153 1154 hdev->features = features; 1155 1156 hdev->memory_listener = (MemoryListener) { 1157 .begin = vhost_begin, 1158 .commit = vhost_commit, 1159 .region_add = vhost_region_addnop, 1160 .region_nop = vhost_region_addnop, 1161 .log_start = vhost_log_start, 1162 .log_stop = vhost_log_stop, 1163 .log_sync = vhost_log_sync, 1164 .log_global_start = vhost_log_global_start, 1165 .log_global_stop = vhost_log_global_stop, 1166 .eventfd_add = vhost_eventfd_add, 1167 .eventfd_del = vhost_eventfd_del, 1168 .priority = 10 1169 }; 1170 1171 hdev->iommu_listener = (MemoryListener) { 1172 .region_add = vhost_iommu_region_add, 1173 .region_del = vhost_iommu_region_del, 1174 }; 1175 1176 if (hdev->migration_blocker == NULL) { 1177 if (!(hdev->features & (0x1ULL << VHOST_F_LOG_ALL))) { 1178 error_setg(&hdev->migration_blocker, 1179 "Migration disabled: vhost lacks VHOST_F_LOG_ALL feature."); 1180 } else if (vhost_dev_log_is_shared(hdev) && !qemu_memfd_check()) { 1181 error_setg(&hdev->migration_blocker, 1182 "Migration disabled: failed to allocate shared memory"); 1183 } 1184 } 1185 1186 if (hdev->migration_blocker != NULL) { 1187 r = migrate_add_blocker(hdev->migration_blocker, &local_err); 1188 if (local_err) { 1189 error_report_err(local_err); 1190 error_free(hdev->migration_blocker); 1191 goto fail_busyloop; 1192 } 1193 } 1194 1195 hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions)); 1196 hdev->n_mem_sections = 0; 1197 hdev->mem_sections = NULL; 1198 hdev->log = NULL; 1199 hdev->log_size = 0; 1200 hdev->log_enabled = false; 1201 hdev->started = false; 1202 memory_listener_register(&hdev->memory_listener, &address_space_memory); 1203 QLIST_INSERT_HEAD(&vhost_devices, hdev, entry); 1204 1205 if (used_memslots > hdev->vhost_ops->vhost_backend_memslots_limit(hdev)) { 1206 error_report("vhost backend memory slots limit is less" 1207 " than current number of present memory slots"); 1208 r = -1; 1209 if (busyloop_timeout) { 1210 goto fail_busyloop; 1211 } else { 1212 goto fail; 1213 } 1214 } 1215 1216 return 0; 1217 1218 fail_busyloop: 1219 while (--i >= 0) { 1220 vhost_virtqueue_set_busyloop_timeout(hdev, hdev->vq_index + i, 0); 1221 } 1222 fail: 1223 hdev->nvqs = n_initialized_vqs; 1224 vhost_dev_cleanup(hdev); 1225 return r; 1226 } 1227 1228 void vhost_dev_cleanup(struct vhost_dev *hdev) 1229 { 1230 int i; 1231 1232 for (i = 0; i < hdev->nvqs; ++i) { 1233 vhost_virtqueue_cleanup(hdev->vqs + i); 1234 } 1235 if (hdev->mem) { 1236 /* those are only safe after successful init */ 1237 memory_listener_unregister(&hdev->memory_listener); 1238 QLIST_REMOVE(hdev, entry); 1239 } 1240 if (hdev->migration_blocker) { 1241 migrate_del_blocker(hdev->migration_blocker); 1242 error_free(hdev->migration_blocker); 1243 } 1244 g_free(hdev->mem); 1245 g_free(hdev->mem_sections); 1246 if (hdev->vhost_ops) { 1247 hdev->vhost_ops->vhost_backend_cleanup(hdev); 1248 } 1249 assert(!hdev->log); 1250 1251 memset(hdev, 0, sizeof(struct vhost_dev)); 1252 } 1253 1254 /* Stop processing guest IO notifications in qemu. 1255 * Start processing them in vhost in kernel. 1256 */ 1257 int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) 1258 { 1259 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); 1260 int i, r, e; 1261 1262 /* We will pass the notifiers to the kernel, make sure that QEMU 1263 * doesn't interfere. 1264 */ 1265 r = virtio_device_grab_ioeventfd(vdev); 1266 if (r < 0) { 1267 error_report("binding does not support host notifiers"); 1268 goto fail; 1269 } 1270 1271 for (i = 0; i < hdev->nvqs; ++i) { 1272 r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, 1273 true); 1274 if (r < 0) { 1275 error_report("vhost VQ %d notifier binding failed: %d", i, -r); 1276 goto fail_vq; 1277 } 1278 } 1279 1280 return 0; 1281 fail_vq: 1282 while (--i >= 0) { 1283 e = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, 1284 false); 1285 if (e < 0) { 1286 error_report("vhost VQ %d notifier cleanup error: %d", i, -r); 1287 } 1288 assert (e >= 0); 1289 virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i); 1290 } 1291 virtio_device_release_ioeventfd(vdev); 1292 fail: 1293 return r; 1294 } 1295 1296 /* Stop processing guest IO notifications in vhost. 1297 * Start processing them in qemu. 1298 * This might actually run the qemu handlers right away, 1299 * so virtio in qemu must be completely setup when this is called. 1300 */ 1301 void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) 1302 { 1303 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); 1304 int i, r; 1305 1306 for (i = 0; i < hdev->nvqs; ++i) { 1307 r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, 1308 false); 1309 if (r < 0) { 1310 error_report("vhost VQ %d notifier cleanup failed: %d", i, -r); 1311 } 1312 assert (r >= 0); 1313 virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i); 1314 } 1315 virtio_device_release_ioeventfd(vdev); 1316 } 1317 1318 /* Test and clear event pending status. 1319 * Should be called after unmask to avoid losing events. 1320 */ 1321 bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n) 1322 { 1323 struct vhost_virtqueue *vq = hdev->vqs + n - hdev->vq_index; 1324 assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); 1325 return event_notifier_test_and_clear(&vq->masked_notifier); 1326 } 1327 1328 /* Mask/unmask events from this vq. */ 1329 void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, 1330 bool mask) 1331 { 1332 struct VirtQueue *vvq = virtio_get_queue(vdev, n); 1333 int r, index = n - hdev->vq_index; 1334 struct vhost_vring_file file; 1335 1336 /* should only be called after backend is connected */ 1337 assert(hdev->vhost_ops); 1338 1339 if (mask) { 1340 assert(vdev->use_guest_notifier_mask); 1341 file.fd = event_notifier_get_fd(&hdev->vqs[index].masked_notifier); 1342 } else { 1343 file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq)); 1344 } 1345 1346 file.index = hdev->vhost_ops->vhost_get_vq_index(hdev, n); 1347 r = hdev->vhost_ops->vhost_set_vring_call(hdev, &file); 1348 if (r < 0) { 1349 VHOST_OPS_DEBUG("vhost_set_vring_call failed"); 1350 } 1351 } 1352 1353 uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits, 1354 uint64_t features) 1355 { 1356 const int *bit = feature_bits; 1357 while (*bit != VHOST_INVALID_FEATURE_BIT) { 1358 uint64_t bit_mask = (1ULL << *bit); 1359 if (!(hdev->features & bit_mask)) { 1360 features &= ~bit_mask; 1361 } 1362 bit++; 1363 } 1364 return features; 1365 } 1366 1367 void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits, 1368 uint64_t features) 1369 { 1370 const int *bit = feature_bits; 1371 while (*bit != VHOST_INVALID_FEATURE_BIT) { 1372 uint64_t bit_mask = (1ULL << *bit); 1373 if (features & bit_mask) { 1374 hdev->acked_features |= bit_mask; 1375 } 1376 bit++; 1377 } 1378 } 1379 1380 int vhost_dev_get_config(struct vhost_dev *hdev, uint8_t *config, 1381 uint32_t config_len) 1382 { 1383 assert(hdev->vhost_ops); 1384 1385 if (hdev->vhost_ops->vhost_get_config) { 1386 return hdev->vhost_ops->vhost_get_config(hdev, config, config_len); 1387 } 1388 1389 return -1; 1390 } 1391 1392 int vhost_dev_set_config(struct vhost_dev *hdev, const uint8_t *data, 1393 uint32_t offset, uint32_t size, uint32_t flags) 1394 { 1395 assert(hdev->vhost_ops); 1396 1397 if (hdev->vhost_ops->vhost_set_config) { 1398 return hdev->vhost_ops->vhost_set_config(hdev, data, offset, 1399 size, flags); 1400 } 1401 1402 return -1; 1403 } 1404 1405 void vhost_dev_set_config_notifier(struct vhost_dev *hdev, 1406 const VhostDevConfigOps *ops) 1407 { 1408 assert(hdev->vhost_ops); 1409 hdev->config_ops = ops; 1410 } 1411 1412 /* Host notifiers must be enabled at this point. */ 1413 int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev) 1414 { 1415 int i, r; 1416 1417 /* should only be called after backend is connected */ 1418 assert(hdev->vhost_ops); 1419 1420 hdev->started = true; 1421 hdev->vdev = vdev; 1422 1423 r = vhost_dev_set_features(hdev, hdev->log_enabled); 1424 if (r < 0) { 1425 goto fail_features; 1426 } 1427 1428 if (vhost_dev_has_iommu(hdev)) { 1429 memory_listener_register(&hdev->iommu_listener, vdev->dma_as); 1430 } 1431 1432 r = hdev->vhost_ops->vhost_set_mem_table(hdev, hdev->mem); 1433 if (r < 0) { 1434 VHOST_OPS_DEBUG("vhost_set_mem_table failed"); 1435 r = -errno; 1436 goto fail_mem; 1437 } 1438 for (i = 0; i < hdev->nvqs; ++i) { 1439 r = vhost_virtqueue_start(hdev, 1440 vdev, 1441 hdev->vqs + i, 1442 hdev->vq_index + i); 1443 if (r < 0) { 1444 goto fail_vq; 1445 } 1446 } 1447 1448 if (hdev->log_enabled) { 1449 uint64_t log_base; 1450 1451 hdev->log_size = vhost_get_log_size(hdev); 1452 hdev->log = vhost_log_get(hdev->log_size, 1453 vhost_dev_log_is_shared(hdev)); 1454 log_base = (uintptr_t)hdev->log->log; 1455 r = hdev->vhost_ops->vhost_set_log_base(hdev, 1456 hdev->log_size ? log_base : 0, 1457 hdev->log); 1458 if (r < 0) { 1459 VHOST_OPS_DEBUG("vhost_set_log_base failed"); 1460 r = -errno; 1461 goto fail_log; 1462 } 1463 } 1464 1465 if (vhost_dev_has_iommu(hdev)) { 1466 hdev->vhost_ops->vhost_set_iotlb_callback(hdev, true); 1467 1468 /* Update used ring information for IOTLB to work correctly, 1469 * vhost-kernel code requires for this.*/ 1470 for (i = 0; i < hdev->nvqs; ++i) { 1471 struct vhost_virtqueue *vq = hdev->vqs + i; 1472 vhost_device_iotlb_miss(hdev, vq->used_phys, true); 1473 } 1474 } 1475 return 0; 1476 fail_log: 1477 vhost_log_put(hdev, false); 1478 fail_vq: 1479 while (--i >= 0) { 1480 vhost_virtqueue_stop(hdev, 1481 vdev, 1482 hdev->vqs + i, 1483 hdev->vq_index + i); 1484 } 1485 i = hdev->nvqs; 1486 1487 fail_mem: 1488 fail_features: 1489 1490 hdev->started = false; 1491 return r; 1492 } 1493 1494 /* Host notifiers must be enabled at this point. */ 1495 void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev) 1496 { 1497 int i; 1498 1499 /* should only be called after backend is connected */ 1500 assert(hdev->vhost_ops); 1501 1502 for (i = 0; i < hdev->nvqs; ++i) { 1503 vhost_virtqueue_stop(hdev, 1504 vdev, 1505 hdev->vqs + i, 1506 hdev->vq_index + i); 1507 } 1508 1509 if (vhost_dev_has_iommu(hdev)) { 1510 hdev->vhost_ops->vhost_set_iotlb_callback(hdev, false); 1511 memory_listener_unregister(&hdev->iommu_listener); 1512 } 1513 vhost_log_put(hdev, true); 1514 hdev->started = false; 1515 hdev->vdev = NULL; 1516 } 1517 1518 int vhost_net_set_backend(struct vhost_dev *hdev, 1519 struct vhost_vring_file *file) 1520 { 1521 if (hdev->vhost_ops->vhost_net_set_backend) { 1522 return hdev->vhost_ops->vhost_net_set_backend(hdev, file); 1523 } 1524 1525 return -1; 1526 } 1527