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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
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
44static struct vhost_log *vhost_log;
45static struct vhost_log *vhost_log_shm;
46
47static unsigned int used_memslots;
48static QLIST_HEAD(, vhost_dev) vhost_devices =
49 QLIST_HEAD_INITIALIZER(vhost_devices);
50
51bool 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
63static 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
85
86 if (!*from) {
87 addr += VHOST_LOG_CHUNK;
88 continue;
89 }
90
91
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
108static 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
140static 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
148static void vhost_log_sync_range(struct vhost_dev *dev,
149 hwaddr first, hwaddr last)
150{
151 int i;
152
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
159static 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
177static 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
206static 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
224static 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
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
255static 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
261static 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
268
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
279static 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
286static 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
296static 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
305static 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
320 if (ring_last > reg_last) {
321 return -ENOMEM;
322 }
323
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
332static 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 if (vhost_dev_has_iommu(dev)) {
346 return 0;
347 }
348
349 for (i = 0; i < dev->nvqs; ++i) {
350 struct vhost_virtqueue *vq = dev->vqs + i;
351
352 if (vq->desc_phys == 0) {
353 continue;
354 }
355
356 j = 0;
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->avail, vq->avail_phys, vq->avail_size,
367 reg_hva, reg_gpa, reg_size);
368 if (r) {
369 break;
370 }
371
372 j++;
373 r = vhost_verify_ring_part_mapping(
374 vq->used, vq->used_phys, vq->used_size,
375 reg_hva, reg_gpa, reg_size);
376 if (r) {
377 break;
378 }
379 }
380
381 if (r == -ENOMEM) {
382 error_report("Unable to map %s for ring %d", part_name[j], i);
383 } else if (r == -EBUSY) {
384 error_report("%s relocated for ring %d", part_name[j], i);
385 }
386 return r;
387}
388
389static bool vhost_section(MemoryRegionSection *section)
390{
391 bool result;
392 bool log_dirty = memory_region_get_dirty_log_mask(section->mr) &
393 ~(1 << DIRTY_MEMORY_MIGRATION);
394 result = memory_region_is_ram(section->mr) &&
395 !memory_region_is_rom(section->mr);
396
397
398
399
400 result &= !log_dirty;
401
402 trace_vhost_section(section->mr->name, result);
403 return result;
404}
405
406static void vhost_begin(MemoryListener *listener)
407{
408 struct vhost_dev *dev = container_of(listener, struct vhost_dev,
409 memory_listener);
410 dev->tmp_sections = NULL;
411 dev->n_tmp_sections = 0;
412}
413
414static void vhost_commit(MemoryListener *listener)
415{
416 struct vhost_dev *dev = container_of(listener, struct vhost_dev,
417 memory_listener);
418 MemoryRegionSection *old_sections;
419 int n_old_sections;
420 uint64_t log_size;
421 size_t regions_size;
422 int r;
423 int i;
424 bool changed = false;
425
426
427
428
429
430 old_sections = dev->mem_sections;
431 n_old_sections = dev->n_mem_sections;
432 dev->mem_sections = dev->tmp_sections;
433 dev->n_mem_sections = dev->n_tmp_sections;
434
435 if (dev->n_mem_sections != n_old_sections) {
436 changed = true;
437 } else {
438
439 changed = n_old_sections && memcmp(dev->mem_sections, old_sections,
440 n_old_sections * sizeof(old_sections[0])) != 0;
441 }
442
443 trace_vhost_commit(dev->started, changed);
444 if (!changed) {
445 goto out;
446 }
447
448
449 regions_size = offsetof(struct vhost_memory, regions) +
450 dev->n_mem_sections * sizeof dev->mem->regions[0];
451 dev->mem = g_realloc(dev->mem, regions_size);
452 dev->mem->nregions = dev->n_mem_sections;
453 used_memslots = dev->mem->nregions;
454 for (i = 0; i < dev->n_mem_sections; i++) {
455 struct vhost_memory_region *cur_vmr = dev->mem->regions + i;
456 struct MemoryRegionSection *mrs = dev->mem_sections + i;
457
458 cur_vmr->guest_phys_addr = mrs->offset_within_address_space;
459 cur_vmr->memory_size = int128_get64(mrs->size);
460 cur_vmr->userspace_addr =
461 (uintptr_t)memory_region_get_ram_ptr(mrs->mr) +
462 mrs->offset_within_region;
463 cur_vmr->flags_padding = 0;
464 }
465
466 if (!dev->started) {
467 goto out;
468 }
469
470 for (i = 0; i < dev->mem->nregions; i++) {
471 if (vhost_verify_ring_mappings(dev,
472 (void *)(uintptr_t)dev->mem->regions[i].userspace_addr,
473 dev->mem->regions[i].guest_phys_addr,
474 dev->mem->regions[i].memory_size)) {
475 error_report("Verify ring failure on region %d", i);
476 abort();
477 }
478 }
479
480 if (!dev->log_enabled) {
481 r = dev->vhost_ops->vhost_set_mem_table(dev, dev->mem);
482 if (r < 0) {
483 VHOST_OPS_DEBUG("vhost_set_mem_table failed");
484 }
485 goto out;
486 }
487 log_size = vhost_get_log_size(dev);
488
489
490#define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log)
491
492 if (dev->log_size < log_size) {
493 vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER);
494 }
495 r = dev->vhost_ops->vhost_set_mem_table(dev, dev->mem);
496 if (r < 0) {
497 VHOST_OPS_DEBUG("vhost_set_mem_table failed");
498 }
499
500 if (dev->log_size > log_size + VHOST_LOG_BUFFER) {
501 vhost_dev_log_resize(dev, log_size);
502 }
503
504out:
505
506
507
508
509 while (n_old_sections--) {
510 memory_region_unref(old_sections[n_old_sections].mr);
511 }
512 g_free(old_sections);
513 return;
514}
515
516
517
518
519
520
521static void vhost_region_add_section(struct vhost_dev *dev,
522 MemoryRegionSection *section)
523{
524 bool need_add = true;
525 uint64_t mrs_size = int128_get64(section->size);
526 uint64_t mrs_gpa = section->offset_within_address_space;
527 uintptr_t mrs_host = (uintptr_t)memory_region_get_ram_ptr(section->mr) +
528 section->offset_within_region;
529 RAMBlock *mrs_rb = section->mr->ram_block;
530 size_t mrs_page = qemu_ram_pagesize(mrs_rb);
531
532 trace_vhost_region_add_section(section->mr->name, mrs_gpa, mrs_size,
533 mrs_host);
534
535
536
537 uint64_t alignage = mrs_host & (mrs_page - 1);
538 if (alignage) {
539 mrs_host -= alignage;
540 mrs_size += alignage;
541 mrs_gpa -= alignage;
542 }
543
544 alignage = mrs_size & (mrs_page - 1);
545 if (alignage) {
546 mrs_size += mrs_page - alignage;
547 }
548 trace_vhost_region_add_section_aligned(section->mr->name, mrs_gpa, mrs_size,
549 mrs_host);
550
551 if (dev->n_tmp_sections) {
552
553
554
555
556
557 MemoryRegionSection *prev_sec = dev->tmp_sections +
558 (dev->n_tmp_sections - 1);
559 uint64_t prev_gpa_start = prev_sec->offset_within_address_space;
560 uint64_t prev_size = int128_get64(prev_sec->size);
561 uint64_t prev_gpa_end = range_get_last(prev_gpa_start, prev_size);
562 uint64_t prev_host_start =
563 (uintptr_t)memory_region_get_ram_ptr(prev_sec->mr) +
564 prev_sec->offset_within_region;
565 uint64_t prev_host_end = range_get_last(prev_host_start, prev_size);
566
567 if (mrs_gpa <= (prev_gpa_end + 1)) {
568
569
570
571
572 if (mrs_gpa < prev_gpa_start) {
573 error_report("%s:Section rounded to %"PRIx64
574 " prior to previous %"PRIx64,
575 __func__, mrs_gpa, prev_gpa_start);
576
577 return;
578 }
579
580 size_t offset = mrs_gpa - prev_gpa_start;
581
582 if (prev_host_start + offset == mrs_host &&
583 section->mr == prev_sec->mr &&
584 (!dev->vhost_ops->vhost_backend_can_merge ||
585 dev->vhost_ops->vhost_backend_can_merge(dev,
586 mrs_host, mrs_size,
587 prev_host_start, prev_size))) {
588 uint64_t max_end = MAX(prev_host_end, mrs_host + mrs_size);
589 need_add = false;
590 prev_sec->offset_within_address_space =
591 MIN(prev_gpa_start, mrs_gpa);
592 prev_sec->offset_within_region =
593 MIN(prev_host_start, mrs_host) -
594 (uintptr_t)memory_region_get_ram_ptr(prev_sec->mr);
595 prev_sec->size = int128_make64(max_end - MIN(prev_host_start,
596 mrs_host));
597 trace_vhost_region_add_section_merge(section->mr->name,
598 int128_get64(prev_sec->size),
599 prev_sec->offset_within_address_space,
600 prev_sec->offset_within_region);
601 } else {
602
603
604
605 if (mrs_gpa != prev_gpa_end + 1) {
606 error_report("%s: Overlapping but not coherent sections "
607 "at %"PRIx64,
608 __func__, mrs_gpa);
609 return;
610 }
611 }
612 }
613 }
614
615 if (need_add) {
616 ++dev->n_tmp_sections;
617 dev->tmp_sections = g_renew(MemoryRegionSection, dev->tmp_sections,
618 dev->n_tmp_sections);
619 dev->tmp_sections[dev->n_tmp_sections - 1] = *section;
620
621
622
623 dev->tmp_sections[dev->n_tmp_sections - 1].fv = NULL;
624 memory_region_ref(section->mr);
625 }
626}
627
628
629static void vhost_region_addnop(MemoryListener *listener,
630 MemoryRegionSection *section)
631{
632 struct vhost_dev *dev = container_of(listener, struct vhost_dev,
633 memory_listener);
634
635 if (!vhost_section(section)) {
636 return;
637 }
638 vhost_region_add_section(dev, section);
639}
640
641static void vhost_iommu_unmap_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
642{
643 struct vhost_iommu *iommu = container_of(n, struct vhost_iommu, n);
644 struct vhost_dev *hdev = iommu->hdev;
645 hwaddr iova = iotlb->iova + iommu->iommu_offset;
646
647 if (vhost_backend_invalidate_device_iotlb(hdev, iova,
648 iotlb->addr_mask + 1)) {
649 error_report("Fail to invalidate device iotlb");
650 }
651}
652
653static void vhost_iommu_region_add(MemoryListener *listener,
654 MemoryRegionSection *section)
655{
656 struct vhost_dev *dev = container_of(listener, struct vhost_dev,
657 iommu_listener);
658 struct vhost_iommu *iommu;
659 Int128 end;
660
661 if (!memory_region_is_iommu(section->mr)) {
662 return;
663 }
664
665 iommu = g_malloc0(sizeof(*iommu));
666 end = int128_add(int128_make64(section->offset_within_region),
667 section->size);
668 end = int128_sub(end, int128_one());
669 iommu_notifier_init(&iommu->n, vhost_iommu_unmap_notify,
670 IOMMU_NOTIFIER_UNMAP,
671 section->offset_within_region,
672 int128_get64(end));
673 iommu->mr = section->mr;
674 iommu->iommu_offset = section->offset_within_address_space -
675 section->offset_within_region;
676 iommu->hdev = dev;
677 memory_region_register_iommu_notifier(section->mr, &iommu->n);
678 QLIST_INSERT_HEAD(&dev->iommu_list, iommu, iommu_next);
679
680}
681
682static void vhost_iommu_region_del(MemoryListener *listener,
683 MemoryRegionSection *section)
684{
685 struct vhost_dev *dev = container_of(listener, struct vhost_dev,
686 iommu_listener);
687 struct vhost_iommu *iommu;
688
689 if (!memory_region_is_iommu(section->mr)) {
690 return;
691 }
692
693 QLIST_FOREACH(iommu, &dev->iommu_list, iommu_next) {
694 if (iommu->mr == section->mr &&
695 iommu->n.start == section->offset_within_region) {
696 memory_region_unregister_iommu_notifier(iommu->mr,
697 &iommu->n);
698 QLIST_REMOVE(iommu, iommu_next);
699 g_free(iommu);
700 break;
701 }
702 }
703}
704
705static int vhost_virtqueue_set_addr(struct vhost_dev *dev,
706 struct vhost_virtqueue *vq,
707 unsigned idx, bool enable_log)
708{
709 struct vhost_vring_addr addr = {
710 .index = idx,
711 .desc_user_addr = (uint64_t)(unsigned long)vq->desc,
712 .avail_user_addr = (uint64_t)(unsigned long)vq->avail,
713 .used_user_addr = (uint64_t)(unsigned long)vq->used,
714 .log_guest_addr = vq->used_phys,
715 .flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0,
716 };
717 int r = dev->vhost_ops->vhost_set_vring_addr(dev, &addr);
718 if (r < 0) {
719 VHOST_OPS_DEBUG("vhost_set_vring_addr failed");
720 return -errno;
721 }
722 return 0;
723}
724
725static int vhost_dev_set_features(struct vhost_dev *dev,
726 bool enable_log)
727{
728 uint64_t features = dev->acked_features;
729 int r;
730 if (enable_log) {
731 features |= 0x1ULL << VHOST_F_LOG_ALL;
732 }
733 r = dev->vhost_ops->vhost_set_features(dev, features);
734 if (r < 0) {
735 VHOST_OPS_DEBUG("vhost_set_features failed");
736 }
737 return r < 0 ? -errno : 0;
738}
739
740static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log)
741{
742 int r, i, idx;
743 r = vhost_dev_set_features(dev, enable_log);
744 if (r < 0) {
745 goto err_features;
746 }
747 for (i = 0; i < dev->nvqs; ++i) {
748 idx = dev->vhost_ops->vhost_get_vq_index(dev, dev->vq_index + i);
749 r = vhost_virtqueue_set_addr(dev, dev->vqs + i, idx,
750 enable_log);
751 if (r < 0) {
752 goto err_vq;
753 }
754 }
755 return 0;
756err_vq:
757 for (; i >= 0; --i) {
758 idx = dev->vhost_ops->vhost_get_vq_index(dev, dev->vq_index + i);
759 vhost_virtqueue_set_addr(dev, dev->vqs + i, idx,
760 dev->log_enabled);
761 }
762 vhost_dev_set_features(dev, dev->log_enabled);
763err_features:
764 return r;
765}
766
767static int vhost_migration_log(MemoryListener *listener, int enable)
768{
769 struct vhost_dev *dev = container_of(listener, struct vhost_dev,
770 memory_listener);
771 int r;
772 if (!!enable == dev->log_enabled) {
773 return 0;
774 }
775 if (!dev->started) {
776 dev->log_enabled = enable;
777 return 0;
778 }
779 if (!enable) {
780 r = vhost_dev_set_log(dev, false);
781 if (r < 0) {
782 return r;
783 }
784 vhost_log_put(dev, false);
785 } else {
786 vhost_dev_log_resize(dev, vhost_get_log_size(dev));
787 r = vhost_dev_set_log(dev, true);
788 if (r < 0) {
789 return r;
790 }
791 }
792 dev->log_enabled = enable;
793 return 0;
794}
795
796static void vhost_log_global_start(MemoryListener *listener)
797{
798 int r;
799
800 r = vhost_migration_log(listener, true);
801 if (r < 0) {
802 abort();
803 }
804}
805
806static void vhost_log_global_stop(MemoryListener *listener)
807{
808 int r;
809
810 r = vhost_migration_log(listener, false);
811 if (r < 0) {
812 abort();
813 }
814}
815
816static void vhost_log_start(MemoryListener *listener,
817 MemoryRegionSection *section,
818 int old, int new)
819{
820
821}
822
823static void vhost_log_stop(MemoryListener *listener,
824 MemoryRegionSection *section,
825 int old, int new)
826{
827
828}
829
830
831
832
833
834
835static inline bool vhost_needs_vring_endian(VirtIODevice *vdev)
836{
837 if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
838 return false;
839 }
840#ifdef HOST_WORDS_BIGENDIAN
841 return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_LITTLE;
842#else
843 return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG;
844#endif
845}
846
847static int vhost_virtqueue_set_vring_endian_legacy(struct vhost_dev *dev,
848 bool is_big_endian,
849 int vhost_vq_index)
850{
851 struct vhost_vring_state s = {
852 .index = vhost_vq_index,
853 .num = is_big_endian
854 };
855
856 if (!dev->vhost_ops->vhost_set_vring_endian(dev, &s)) {
857 return 0;
858 }
859
860 VHOST_OPS_DEBUG("vhost_set_vring_endian failed");
861 if (errno == ENOTTY) {
862 error_report("vhost does not support cross-endian");
863 return -ENOSYS;
864 }
865
866 return -errno;
867}
868
869static int vhost_memory_region_lookup(struct vhost_dev *hdev,
870 uint64_t gpa, uint64_t *uaddr,
871 uint64_t *len)
872{
873 int i;
874
875 for (i = 0; i < hdev->mem->nregions; i++) {
876 struct vhost_memory_region *reg = hdev->mem->regions + i;
877
878 if (gpa >= reg->guest_phys_addr &&
879 reg->guest_phys_addr + reg->memory_size > gpa) {
880 *uaddr = reg->userspace_addr + gpa - reg->guest_phys_addr;
881 *len = reg->guest_phys_addr + reg->memory_size - gpa;
882 return 0;
883 }
884 }
885
886 return -EFAULT;
887}
888
889int vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write)
890{
891 IOMMUTLBEntry iotlb;
892 uint64_t uaddr, len;
893 int ret = -EFAULT;
894
895 rcu_read_lock();
896
897 iotlb = address_space_get_iotlb_entry(dev->vdev->dma_as,
898 iova, write);
899 if (iotlb.target_as != NULL) {
900 ret = vhost_memory_region_lookup(dev, iotlb.translated_addr,
901 &uaddr, &len);
902 if (ret) {
903 error_report("Fail to lookup the translated address "
904 "%"PRIx64, iotlb.translated_addr);
905 goto out;
906 }
907
908 len = MIN(iotlb.addr_mask + 1, len);
909 iova = iova & ~iotlb.addr_mask;
910
911 ret = vhost_backend_update_device_iotlb(dev, iova, uaddr,
912 len, iotlb.perm);
913 if (ret) {
914 error_report("Fail to update device iotlb");
915 goto out;
916 }
917 }
918out:
919 rcu_read_unlock();
920
921 return ret;
922}
923
924static int vhost_virtqueue_start(struct vhost_dev *dev,
925 struct VirtIODevice *vdev,
926 struct vhost_virtqueue *vq,
927 unsigned idx)
928{
929 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
930 VirtioBusState *vbus = VIRTIO_BUS(qbus);
931 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
932 hwaddr s, l, a;
933 int r;
934 int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx);
935 struct vhost_vring_file file = {
936 .index = vhost_vq_index
937 };
938 struct vhost_vring_state state = {
939 .index = vhost_vq_index
940 };
941 struct VirtQueue *vvq = virtio_get_queue(vdev, idx);
942
943 a = virtio_queue_get_desc_addr(vdev, idx);
944 if (a == 0) {
945
946 return 0;
947 }
948
949 vq->num = state.num = virtio_queue_get_num(vdev, idx);
950 r = dev->vhost_ops->vhost_set_vring_num(dev, &state);
951 if (r) {
952 VHOST_OPS_DEBUG("vhost_set_vring_num failed");
953 return -errno;
954 }
955
956 state.num = virtio_queue_get_last_avail_idx(vdev, idx);
957 r = dev->vhost_ops->vhost_set_vring_base(dev, &state);
958 if (r) {
959 VHOST_OPS_DEBUG("vhost_set_vring_base failed");
960 return -errno;
961 }
962
963 if (vhost_needs_vring_endian(vdev)) {
964 r = vhost_virtqueue_set_vring_endian_legacy(dev,
965 virtio_is_big_endian(vdev),
966 vhost_vq_index);
967 if (r) {
968 return -errno;
969 }
970 }
971
972 vq->desc_size = s = l = virtio_queue_get_desc_size(vdev, idx);
973 vq->desc_phys = a;
974 vq->desc = vhost_memory_map(dev, a, &l, 0);
975 if (!vq->desc || l != s) {
976 r = -ENOMEM;
977 goto fail_alloc_desc;
978 }
979 vq->avail_size = s = l = virtio_queue_get_avail_size(vdev, idx);
980 vq->avail_phys = a = virtio_queue_get_avail_addr(vdev, idx);
981 vq->avail = vhost_memory_map(dev, a, &l, 0);
982 if (!vq->avail || l != s) {
983 r = -ENOMEM;
984 goto fail_alloc_avail;
985 }
986 vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx);
987 vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx);
988 vq->used = vhost_memory_map(dev, a, &l, 1);
989 if (!vq->used || l != s) {
990 r = -ENOMEM;
991 goto fail_alloc_used;
992 }
993
994 r = vhost_virtqueue_set_addr(dev, vq, vhost_vq_index, dev->log_enabled);
995 if (r < 0) {
996 r = -errno;
997 goto fail_alloc;
998 }
999
1000 file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq));
1001 r = dev->vhost_ops->vhost_set_vring_kick(dev, &file);
1002 if (r) {
1003 VHOST_OPS_DEBUG("vhost_set_vring_kick failed");
1004 r = -errno;
1005 goto fail_kick;
1006 }
1007
1008
1009 event_notifier_test_and_clear(&vq->masked_notifier);
1010
1011
1012
1013
1014 if (!vdev->use_guest_notifier_mask) {
1015
1016 vhost_virtqueue_mask(dev, vdev, idx, false);
1017 }
1018
1019 if (k->query_guest_notifiers &&
1020 k->query_guest_notifiers(qbus->parent) &&
1021 virtio_queue_vector(vdev, idx) == VIRTIO_NO_VECTOR) {
1022 file.fd = -1;
1023 r = dev->vhost_ops->vhost_set_vring_call(dev, &file);
1024 if (r) {
1025 goto fail_vector;
1026 }
1027 }
1028
1029 return 0;
1030
1031fail_vector:
1032fail_kick:
1033fail_alloc:
1034 vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx),
1035 0, 0);
1036fail_alloc_used:
1037 vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx),
1038 0, 0);
1039fail_alloc_avail:
1040 vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx),
1041 0, 0);
1042fail_alloc_desc:
1043 return r;
1044}
1045
1046static void vhost_virtqueue_stop(struct vhost_dev *dev,
1047 struct VirtIODevice *vdev,
1048 struct vhost_virtqueue *vq,
1049 unsigned idx)
1050{
1051 int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx);
1052 struct vhost_vring_state state = {
1053 .index = vhost_vq_index,
1054 };
1055 int r;
1056 int a;
1057
1058 a = virtio_queue_get_desc_addr(vdev, idx);
1059 if (a == 0) {
1060
1061 return;
1062 }
1063
1064 r = dev->vhost_ops->vhost_get_vring_base(dev, &state);
1065 if (r < 0) {
1066 VHOST_OPS_DEBUG("vhost VQ %d ring restore failed: %d", idx, r);
1067
1068
1069
1070 virtio_queue_restore_last_avail_idx(vdev, idx);
1071 } else {
1072 virtio_queue_set_last_avail_idx(vdev, idx, state.num);
1073 }
1074 virtio_queue_invalidate_signalled_used(vdev, idx);
1075 virtio_queue_update_used_idx(vdev, idx);
1076
1077
1078
1079
1080 if (vhost_needs_vring_endian(vdev)) {
1081 vhost_virtqueue_set_vring_endian_legacy(dev,
1082 !virtio_is_big_endian(vdev),
1083 vhost_vq_index);
1084 }
1085
1086 vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx),
1087 1, virtio_queue_get_used_size(vdev, idx));
1088 vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx),
1089 0, virtio_queue_get_avail_size(vdev, idx));
1090 vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx),
1091 0, virtio_queue_get_desc_size(vdev, idx));
1092}
1093
1094static void vhost_eventfd_add(MemoryListener *listener,
1095 MemoryRegionSection *section,
1096 bool match_data, uint64_t data, EventNotifier *e)
1097{
1098}
1099
1100static void vhost_eventfd_del(MemoryListener *listener,
1101 MemoryRegionSection *section,
1102 bool match_data, uint64_t data, EventNotifier *e)
1103{
1104}
1105
1106static int vhost_virtqueue_set_busyloop_timeout(struct vhost_dev *dev,
1107 int n, uint32_t timeout)
1108{
1109 int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, n);
1110 struct vhost_vring_state state = {
1111 .index = vhost_vq_index,
1112 .num = timeout,
1113 };
1114 int r;
1115
1116 if (!dev->vhost_ops->vhost_set_vring_busyloop_timeout) {
1117 return -EINVAL;
1118 }
1119
1120 r = dev->vhost_ops->vhost_set_vring_busyloop_timeout(dev, &state);
1121 if (r) {
1122 VHOST_OPS_DEBUG("vhost_set_vring_busyloop_timeout failed");
1123 return r;
1124 }
1125
1126 return 0;
1127}
1128
1129static int vhost_virtqueue_init(struct vhost_dev *dev,
1130 struct vhost_virtqueue *vq, int n)
1131{
1132 int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, n);
1133 struct vhost_vring_file file = {
1134 .index = vhost_vq_index,
1135 };
1136 int r = event_notifier_init(&vq->masked_notifier, 0);
1137 if (r < 0) {
1138 return r;
1139 }
1140
1141 file.fd = event_notifier_get_fd(&vq->masked_notifier);
1142 r = dev->vhost_ops->vhost_set_vring_call(dev, &file);
1143 if (r) {
1144 VHOST_OPS_DEBUG("vhost_set_vring_call failed");
1145 r = -errno;
1146 goto fail_call;
1147 }
1148
1149 vq->dev = dev;
1150
1151 return 0;
1152fail_call:
1153 event_notifier_cleanup(&vq->masked_notifier);
1154 return r;
1155}
1156
1157static void vhost_virtqueue_cleanup(struct vhost_virtqueue *vq)
1158{
1159 event_notifier_cleanup(&vq->masked_notifier);
1160}
1161
1162int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
1163 VhostBackendType backend_type, uint32_t busyloop_timeout)
1164{
1165 uint64_t features;
1166 int i, r, n_initialized_vqs = 0;
1167 Error *local_err = NULL;
1168
1169 hdev->vdev = NULL;
1170 hdev->migration_blocker = NULL;
1171
1172 r = vhost_set_backend_type(hdev, backend_type);
1173 assert(r >= 0);
1174
1175 r = hdev->vhost_ops->vhost_backend_init(hdev, opaque);
1176 if (r < 0) {
1177 goto fail;
1178 }
1179
1180 r = hdev->vhost_ops->vhost_set_owner(hdev);
1181 if (r < 0) {
1182 VHOST_OPS_DEBUG("vhost_set_owner failed");
1183 goto fail;
1184 }
1185
1186 r = hdev->vhost_ops->vhost_get_features(hdev, &features);
1187 if (r < 0) {
1188 VHOST_OPS_DEBUG("vhost_get_features failed");
1189 goto fail;
1190 }
1191
1192 for (i = 0; i < hdev->nvqs; ++i, ++n_initialized_vqs) {
1193 r = vhost_virtqueue_init(hdev, hdev->vqs + i, hdev->vq_index + i);
1194 if (r < 0) {
1195 goto fail;
1196 }
1197 }
1198
1199 if (busyloop_timeout) {
1200 for (i = 0; i < hdev->nvqs; ++i) {
1201 r = vhost_virtqueue_set_busyloop_timeout(hdev, hdev->vq_index + i,
1202 busyloop_timeout);
1203 if (r < 0) {
1204 goto fail_busyloop;
1205 }
1206 }
1207 }
1208
1209 hdev->features = features;
1210
1211 hdev->memory_listener = (MemoryListener) {
1212 .begin = vhost_begin,
1213 .commit = vhost_commit,
1214 .region_add = vhost_region_addnop,
1215 .region_nop = vhost_region_addnop,
1216 .log_start = vhost_log_start,
1217 .log_stop = vhost_log_stop,
1218 .log_sync = vhost_log_sync,
1219 .log_global_start = vhost_log_global_start,
1220 .log_global_stop = vhost_log_global_stop,
1221 .eventfd_add = vhost_eventfd_add,
1222 .eventfd_del = vhost_eventfd_del,
1223 .priority = 10
1224 };
1225
1226 hdev->iommu_listener = (MemoryListener) {
1227 .region_add = vhost_iommu_region_add,
1228 .region_del = vhost_iommu_region_del,
1229 };
1230
1231 if (hdev->migration_blocker == NULL) {
1232 if (!(hdev->features & (0x1ULL << VHOST_F_LOG_ALL))) {
1233 error_setg(&hdev->migration_blocker,
1234 "Migration disabled: vhost lacks VHOST_F_LOG_ALL feature.");
1235 } else if (vhost_dev_log_is_shared(hdev) && !qemu_memfd_alloc_check()) {
1236 error_setg(&hdev->migration_blocker,
1237 "Migration disabled: failed to allocate shared memory");
1238 }
1239 }
1240
1241 if (hdev->migration_blocker != NULL) {
1242 r = migrate_add_blocker(hdev->migration_blocker, &local_err);
1243 if (local_err) {
1244 error_report_err(local_err);
1245 error_free(hdev->migration_blocker);
1246 goto fail_busyloop;
1247 }
1248 }
1249
1250 hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions));
1251 hdev->n_mem_sections = 0;
1252 hdev->mem_sections = NULL;
1253 hdev->log = NULL;
1254 hdev->log_size = 0;
1255 hdev->log_enabled = false;
1256 hdev->started = false;
1257 memory_listener_register(&hdev->memory_listener, &address_space_memory);
1258 QLIST_INSERT_HEAD(&vhost_devices, hdev, entry);
1259
1260 if (used_memslots > hdev->vhost_ops->vhost_backend_memslots_limit(hdev)) {
1261 error_report("vhost backend memory slots limit is less"
1262 " than current number of present memory slots");
1263 r = -1;
1264 if (busyloop_timeout) {
1265 goto fail_busyloop;
1266 } else {
1267 goto fail;
1268 }
1269 }
1270
1271 return 0;
1272
1273fail_busyloop:
1274 while (--i >= 0) {
1275 vhost_virtqueue_set_busyloop_timeout(hdev, hdev->vq_index + i, 0);
1276 }
1277fail:
1278 hdev->nvqs = n_initialized_vqs;
1279 vhost_dev_cleanup(hdev);
1280 return r;
1281}
1282
1283void vhost_dev_cleanup(struct vhost_dev *hdev)
1284{
1285 int i;
1286
1287 for (i = 0; i < hdev->nvqs; ++i) {
1288 vhost_virtqueue_cleanup(hdev->vqs + i);
1289 }
1290 if (hdev->mem) {
1291
1292 memory_listener_unregister(&hdev->memory_listener);
1293 QLIST_REMOVE(hdev, entry);
1294 }
1295 if (hdev->migration_blocker) {
1296 migrate_del_blocker(hdev->migration_blocker);
1297 error_free(hdev->migration_blocker);
1298 }
1299 g_free(hdev->mem);
1300 g_free(hdev->mem_sections);
1301 if (hdev->vhost_ops) {
1302 hdev->vhost_ops->vhost_backend_cleanup(hdev);
1303 }
1304 assert(!hdev->log);
1305
1306 memset(hdev, 0, sizeof(struct vhost_dev));
1307}
1308
1309
1310
1311
1312int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev)
1313{
1314 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
1315 int i, r, e;
1316
1317
1318
1319
1320 r = virtio_device_grab_ioeventfd(vdev);
1321 if (r < 0) {
1322 error_report("binding does not support host notifiers");
1323 goto fail;
1324 }
1325
1326 for (i = 0; i < hdev->nvqs; ++i) {
1327 r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i,
1328 true);
1329 if (r < 0) {
1330 error_report("vhost VQ %d notifier binding failed: %d", i, -r);
1331 goto fail_vq;
1332 }
1333 }
1334
1335 return 0;
1336fail_vq:
1337 while (--i >= 0) {
1338 e = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i,
1339 false);
1340 if (e < 0) {
1341 error_report("vhost VQ %d notifier cleanup error: %d", i, -r);
1342 }
1343 assert (e >= 0);
1344 virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i);
1345 }
1346 virtio_device_release_ioeventfd(vdev);
1347fail:
1348 return r;
1349}
1350
1351
1352
1353
1354
1355
1356void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev)
1357{
1358 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
1359 int i, r;
1360
1361 for (i = 0; i < hdev->nvqs; ++i) {
1362 r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i,
1363 false);
1364 if (r < 0) {
1365 error_report("vhost VQ %d notifier cleanup failed: %d", i, -r);
1366 }
1367 assert (r >= 0);
1368 virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i);
1369 }
1370 virtio_device_release_ioeventfd(vdev);
1371}
1372
1373
1374
1375
1376bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n)
1377{
1378 struct vhost_virtqueue *vq = hdev->vqs + n - hdev->vq_index;
1379 assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs);
1380 return event_notifier_test_and_clear(&vq->masked_notifier);
1381}
1382
1383
1384void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,
1385 bool mask)
1386{
1387 struct VirtQueue *vvq = virtio_get_queue(vdev, n);
1388 int r, index = n - hdev->vq_index;
1389 struct vhost_vring_file file;
1390
1391
1392 assert(hdev->vhost_ops);
1393
1394 if (mask) {
1395 assert(vdev->use_guest_notifier_mask);
1396 file.fd = event_notifier_get_fd(&hdev->vqs[index].masked_notifier);
1397 } else {
1398 file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq));
1399 }
1400
1401 file.index = hdev->vhost_ops->vhost_get_vq_index(hdev, n);
1402 r = hdev->vhost_ops->vhost_set_vring_call(hdev, &file);
1403 if (r < 0) {
1404 VHOST_OPS_DEBUG("vhost_set_vring_call failed");
1405 }
1406}
1407
1408uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits,
1409 uint64_t features)
1410{
1411 const int *bit = feature_bits;
1412 while (*bit != VHOST_INVALID_FEATURE_BIT) {
1413 uint64_t bit_mask = (1ULL << *bit);
1414 if (!(hdev->features & bit_mask)) {
1415 features &= ~bit_mask;
1416 }
1417 bit++;
1418 }
1419 return features;
1420}
1421
1422void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits,
1423 uint64_t features)
1424{
1425 const int *bit = feature_bits;
1426 while (*bit != VHOST_INVALID_FEATURE_BIT) {
1427 uint64_t bit_mask = (1ULL << *bit);
1428 if (features & bit_mask) {
1429 hdev->acked_features |= bit_mask;
1430 }
1431 bit++;
1432 }
1433}
1434
1435int vhost_dev_get_config(struct vhost_dev *hdev, uint8_t *config,
1436 uint32_t config_len)
1437{
1438 assert(hdev->vhost_ops);
1439
1440 if (hdev->vhost_ops->vhost_get_config) {
1441 return hdev->vhost_ops->vhost_get_config(hdev, config, config_len);
1442 }
1443
1444 return -1;
1445}
1446
1447int vhost_dev_set_config(struct vhost_dev *hdev, const uint8_t *data,
1448 uint32_t offset, uint32_t size, uint32_t flags)
1449{
1450 assert(hdev->vhost_ops);
1451
1452 if (hdev->vhost_ops->vhost_set_config) {
1453 return hdev->vhost_ops->vhost_set_config(hdev, data, offset,
1454 size, flags);
1455 }
1456
1457 return -1;
1458}
1459
1460void vhost_dev_set_config_notifier(struct vhost_dev *hdev,
1461 const VhostDevConfigOps *ops)
1462{
1463 hdev->config_ops = ops;
1464}
1465
1466
1467int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev)
1468{
1469 int i, r;
1470
1471
1472 assert(hdev->vhost_ops);
1473
1474 hdev->started = true;
1475 hdev->vdev = vdev;
1476
1477 r = vhost_dev_set_features(hdev, hdev->log_enabled);
1478 if (r < 0) {
1479 goto fail_features;
1480 }
1481
1482 if (vhost_dev_has_iommu(hdev)) {
1483 memory_listener_register(&hdev->iommu_listener, vdev->dma_as);
1484 }
1485
1486 r = hdev->vhost_ops->vhost_set_mem_table(hdev, hdev->mem);
1487 if (r < 0) {
1488 VHOST_OPS_DEBUG("vhost_set_mem_table failed");
1489 r = -errno;
1490 goto fail_mem;
1491 }
1492 for (i = 0; i < hdev->nvqs; ++i) {
1493 r = vhost_virtqueue_start(hdev,
1494 vdev,
1495 hdev->vqs + i,
1496 hdev->vq_index + i);
1497 if (r < 0) {
1498 goto fail_vq;
1499 }
1500 }
1501
1502 if (hdev->log_enabled) {
1503 uint64_t log_base;
1504
1505 hdev->log_size = vhost_get_log_size(hdev);
1506 hdev->log = vhost_log_get(hdev->log_size,
1507 vhost_dev_log_is_shared(hdev));
1508 log_base = (uintptr_t)hdev->log->log;
1509 r = hdev->vhost_ops->vhost_set_log_base(hdev,
1510 hdev->log_size ? log_base : 0,
1511 hdev->log);
1512 if (r < 0) {
1513 VHOST_OPS_DEBUG("vhost_set_log_base failed");
1514 r = -errno;
1515 goto fail_log;
1516 }
1517 }
1518
1519 if (vhost_dev_has_iommu(hdev)) {
1520 hdev->vhost_ops->vhost_set_iotlb_callback(hdev, true);
1521
1522
1523
1524 for (i = 0; i < hdev->nvqs; ++i) {
1525 struct vhost_virtqueue *vq = hdev->vqs + i;
1526 vhost_device_iotlb_miss(hdev, vq->used_phys, true);
1527 }
1528 }
1529 return 0;
1530fail_log:
1531 vhost_log_put(hdev, false);
1532fail_vq:
1533 while (--i >= 0) {
1534 vhost_virtqueue_stop(hdev,
1535 vdev,
1536 hdev->vqs + i,
1537 hdev->vq_index + i);
1538 }
1539 i = hdev->nvqs;
1540
1541fail_mem:
1542fail_features:
1543
1544 hdev->started = false;
1545 return r;
1546}
1547
1548
1549void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev)
1550{
1551 int i;
1552
1553
1554 assert(hdev->vhost_ops);
1555
1556 for (i = 0; i < hdev->nvqs; ++i) {
1557 vhost_virtqueue_stop(hdev,
1558 vdev,
1559 hdev->vqs + i,
1560 hdev->vq_index + i);
1561 }
1562
1563 if (vhost_dev_has_iommu(hdev)) {
1564 hdev->vhost_ops->vhost_set_iotlb_callback(hdev, false);
1565 memory_listener_unregister(&hdev->iommu_listener);
1566 }
1567 vhost_log_put(hdev, true);
1568 hdev->started = false;
1569 hdev->vdev = NULL;
1570}
1571
1572int vhost_net_set_backend(struct vhost_dev *hdev,
1573 struct vhost_vring_file *file)
1574{
1575 if (hdev->vhost_ops->vhost_net_set_backend) {
1576 return hdev->vhost_ops->vhost_net_set_backend(hdev, file);
1577 }
1578
1579 return -1;
1580}
1581