1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2018 Intel Corporation
7 * The vhost-user protocol connection is an external interface, so it must be
8 * robust against invalid inputs.
10 * This is important because the vhost-user master is only one step removed
11 * from the guest. Malicious guests that have escaped will then launch further
12 * attacks from the vhost-user master.
14 * Even in deployments where guests are trusted, a bug in the vhost-user master
15 * can still cause invalid messages to be sent. Such messages must not
16 * compromise the stability of the DPDK application by causing crashes, memory
17 * corruption, or other problematic behavior.
19 * Do not assume received VhostUserMsg fields contain sensible values!
28 #include <sys/ioctl.h>
30 #include <sys/types.h>
32 #include <sys/syscall.h>
34 #ifdef RTE_LIBRTE_VHOST_NUMA
37 #ifdef RTE_LIBRTE_VHOST_POSTCOPY
38 #include <linux/userfaultfd.h>
40 #ifdef F_ADD_SEALS /* if file sealing is supported, so is memfd */
41 #include <linux/memfd.h>
42 #define MEMFD_SUPPORTED
45 #include <rte_common.h>
46 #include <rte_malloc.h>
51 #include "vhost_user.h"
53 #define VIRTIO_MIN_MTU 68
54 #define VIRTIO_MAX_MTU 65535
56 #define INFLIGHT_ALIGNMENT 64
57 #define INFLIGHT_VERSION 0x1
59 static const char *vhost_message_str[VHOST_USER_MAX] = {
60 [VHOST_USER_NONE] = "VHOST_USER_NONE",
61 [VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES",
62 [VHOST_USER_SET_FEATURES] = "VHOST_USER_SET_FEATURES",
63 [VHOST_USER_SET_OWNER] = "VHOST_USER_SET_OWNER",
64 [VHOST_USER_RESET_OWNER] = "VHOST_USER_RESET_OWNER",
65 [VHOST_USER_SET_MEM_TABLE] = "VHOST_USER_SET_MEM_TABLE",
66 [VHOST_USER_SET_LOG_BASE] = "VHOST_USER_SET_LOG_BASE",
67 [VHOST_USER_SET_LOG_FD] = "VHOST_USER_SET_LOG_FD",
68 [VHOST_USER_SET_VRING_NUM] = "VHOST_USER_SET_VRING_NUM",
69 [VHOST_USER_SET_VRING_ADDR] = "VHOST_USER_SET_VRING_ADDR",
70 [VHOST_USER_SET_VRING_BASE] = "VHOST_USER_SET_VRING_BASE",
71 [VHOST_USER_GET_VRING_BASE] = "VHOST_USER_GET_VRING_BASE",
72 [VHOST_USER_SET_VRING_KICK] = "VHOST_USER_SET_VRING_KICK",
73 [VHOST_USER_SET_VRING_CALL] = "VHOST_USER_SET_VRING_CALL",
74 [VHOST_USER_SET_VRING_ERR] = "VHOST_USER_SET_VRING_ERR",
75 [VHOST_USER_GET_PROTOCOL_FEATURES] = "VHOST_USER_GET_PROTOCOL_FEATURES",
76 [VHOST_USER_SET_PROTOCOL_FEATURES] = "VHOST_USER_SET_PROTOCOL_FEATURES",
77 [VHOST_USER_GET_QUEUE_NUM] = "VHOST_USER_GET_QUEUE_NUM",
78 [VHOST_USER_SET_VRING_ENABLE] = "VHOST_USER_SET_VRING_ENABLE",
79 [VHOST_USER_SEND_RARP] = "VHOST_USER_SEND_RARP",
80 [VHOST_USER_NET_SET_MTU] = "VHOST_USER_NET_SET_MTU",
81 [VHOST_USER_SET_SLAVE_REQ_FD] = "VHOST_USER_SET_SLAVE_REQ_FD",
82 [VHOST_USER_IOTLB_MSG] = "VHOST_USER_IOTLB_MSG",
83 [VHOST_USER_CRYPTO_CREATE_SESS] = "VHOST_USER_CRYPTO_CREATE_SESS",
84 [VHOST_USER_CRYPTO_CLOSE_SESS] = "VHOST_USER_CRYPTO_CLOSE_SESS",
85 [VHOST_USER_POSTCOPY_ADVISE] = "VHOST_USER_POSTCOPY_ADVISE",
86 [VHOST_USER_POSTCOPY_LISTEN] = "VHOST_USER_POSTCOPY_LISTEN",
87 [VHOST_USER_POSTCOPY_END] = "VHOST_USER_POSTCOPY_END",
88 [VHOST_USER_GET_INFLIGHT_FD] = "VHOST_USER_GET_INFLIGHT_FD",
89 [VHOST_USER_SET_INFLIGHT_FD] = "VHOST_USER_SET_INFLIGHT_FD",
92 static int send_vhost_reply(int sockfd, struct VhostUserMsg *msg);
93 static int read_vhost_message(int sockfd, struct VhostUserMsg *msg);
96 close_msg_fds(struct VhostUserMsg *msg)
100 for (i = 0; i < msg->fd_num; i++)
105 * Ensure the expected number of FDs is received,
106 * close all FDs and return an error if this is not the case.
109 validate_msg_fds(struct VhostUserMsg *msg, int expected_fds)
111 if (msg->fd_num == expected_fds)
114 VHOST_LOG_CONFIG(ERR,
115 " Expect %d FDs for request %s, received %d\n",
117 vhost_message_str[msg->request.master],
131 ret = fstat(fd, &stat);
132 return ret == -1 ? (uint64_t)-1 : (uint64_t)stat.st_blksize;
136 * Reclaim all the outstanding zmbufs for a virtqueue.
139 drain_zmbuf_list(struct vhost_virtqueue *vq)
141 struct zcopy_mbuf *zmbuf, *next;
143 for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list);
144 zmbuf != NULL; zmbuf = next) {
145 next = TAILQ_NEXT(zmbuf, next);
147 while (!mbuf_is_consumed(zmbuf->mbuf))
150 TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next);
151 restore_mbuf(zmbuf->mbuf);
152 rte_pktmbuf_free(zmbuf->mbuf);
159 free_mem_region(struct virtio_net *dev)
162 struct rte_vhost_mem_region *reg;
163 struct vhost_virtqueue *vq;
165 if (!dev || !dev->mem)
168 if (dev->dequeue_zero_copy) {
169 for (i = 0; i < dev->nr_vring; i++) {
170 vq = dev->virtqueue[i];
172 drain_zmbuf_list(vq);
176 for (i = 0; i < dev->mem->nregions; i++) {
177 reg = &dev->mem->regions[i];
178 if (reg->host_user_addr) {
179 munmap(reg->mmap_addr, reg->mmap_size);
186 vhost_backend_cleanup(struct virtio_net *dev)
189 free_mem_region(dev);
194 rte_free(dev->guest_pages);
195 dev->guest_pages = NULL;
198 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
202 if (dev->inflight_info) {
203 if (dev->inflight_info->addr) {
204 munmap(dev->inflight_info->addr,
205 dev->inflight_info->size);
206 dev->inflight_info->addr = NULL;
209 if (dev->inflight_info->fd >= 0) {
210 close(dev->inflight_info->fd);
211 dev->inflight_info->fd = -1;
214 free(dev->inflight_info);
215 dev->inflight_info = NULL;
218 if (dev->slave_req_fd >= 0) {
219 close(dev->slave_req_fd);
220 dev->slave_req_fd = -1;
223 if (dev->postcopy_ufd >= 0) {
224 close(dev->postcopy_ufd);
225 dev->postcopy_ufd = -1;
228 dev->postcopy_listening = 0;
232 vhost_user_notify_queue_state(struct virtio_net *dev, uint16_t index,
235 struct rte_vdpa_device *vdpa_dev = dev->vdpa_dev;
237 if (vdpa_dev && vdpa_dev->ops->set_vring_state)
238 vdpa_dev->ops->set_vring_state(dev->vid, index, enable);
240 if (dev->notify_ops->vring_state_changed)
241 dev->notify_ops->vring_state_changed(dev->vid,
246 * This function just returns success at the moment unless
247 * the device hasn't been initialised.
250 vhost_user_set_owner(struct virtio_net **pdev __rte_unused,
251 struct VhostUserMsg *msg,
252 int main_fd __rte_unused)
254 if (validate_msg_fds(msg, 0) != 0)
255 return RTE_VHOST_MSG_RESULT_ERR;
257 return RTE_VHOST_MSG_RESULT_OK;
261 vhost_user_reset_owner(struct virtio_net **pdev,
262 struct VhostUserMsg *msg,
263 int main_fd __rte_unused)
265 struct virtio_net *dev = *pdev;
267 if (validate_msg_fds(msg, 0) != 0)
268 return RTE_VHOST_MSG_RESULT_ERR;
270 vhost_destroy_device_notify(dev);
272 cleanup_device(dev, 0);
274 return RTE_VHOST_MSG_RESULT_OK;
278 * The features that we support are requested.
281 vhost_user_get_features(struct virtio_net **pdev, struct VhostUserMsg *msg,
282 int main_fd __rte_unused)
284 struct virtio_net *dev = *pdev;
285 uint64_t features = 0;
287 if (validate_msg_fds(msg, 0) != 0)
288 return RTE_VHOST_MSG_RESULT_ERR;
290 rte_vhost_driver_get_features(dev->ifname, &features);
292 msg->payload.u64 = features;
293 msg->size = sizeof(msg->payload.u64);
296 return RTE_VHOST_MSG_RESULT_REPLY;
300 * The queue number that we support are requested.
303 vhost_user_get_queue_num(struct virtio_net **pdev, struct VhostUserMsg *msg,
304 int main_fd __rte_unused)
306 struct virtio_net *dev = *pdev;
307 uint32_t queue_num = 0;
309 if (validate_msg_fds(msg, 0) != 0)
310 return RTE_VHOST_MSG_RESULT_ERR;
312 rte_vhost_driver_get_queue_num(dev->ifname, &queue_num);
314 msg->payload.u64 = (uint64_t)queue_num;
315 msg->size = sizeof(msg->payload.u64);
318 return RTE_VHOST_MSG_RESULT_REPLY;
322 * We receive the negotiated features supported by us and the virtio device.
325 vhost_user_set_features(struct virtio_net **pdev, struct VhostUserMsg *msg,
326 int main_fd __rte_unused)
328 struct virtio_net *dev = *pdev;
329 uint64_t features = msg->payload.u64;
330 uint64_t vhost_features = 0;
331 struct rte_vdpa_device *vdpa_dev;
333 if (validate_msg_fds(msg, 0) != 0)
334 return RTE_VHOST_MSG_RESULT_ERR;
336 rte_vhost_driver_get_features(dev->ifname, &vhost_features);
337 if (features & ~vhost_features) {
338 VHOST_LOG_CONFIG(ERR,
339 "(%d) received invalid negotiated features.\n",
341 return RTE_VHOST_MSG_RESULT_ERR;
344 if (dev->flags & VIRTIO_DEV_RUNNING) {
345 if (dev->features == features)
346 return RTE_VHOST_MSG_RESULT_OK;
349 * Error out if master tries to change features while device is
350 * in running state. The exception being VHOST_F_LOG_ALL, which
351 * is enabled when the live-migration starts.
353 if ((dev->features ^ features) & ~(1ULL << VHOST_F_LOG_ALL)) {
354 VHOST_LOG_CONFIG(ERR,
355 "(%d) features changed while device is running.\n",
357 return RTE_VHOST_MSG_RESULT_ERR;
360 if (dev->notify_ops->features_changed)
361 dev->notify_ops->features_changed(dev->vid, features);
364 dev->features = features;
366 ((1 << VIRTIO_NET_F_MRG_RXBUF) | (1ULL << VIRTIO_F_VERSION_1))) {
367 dev->vhost_hlen = sizeof(struct virtio_net_hdr_mrg_rxbuf);
369 dev->vhost_hlen = sizeof(struct virtio_net_hdr);
371 VHOST_LOG_CONFIG(INFO,
372 "negotiated Virtio features: 0x%" PRIx64 "\n", dev->features);
373 VHOST_LOG_CONFIG(DEBUG,
374 "(%d) mergeable RX buffers %s, virtio 1 %s\n",
376 (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? "on" : "off",
377 (dev->features & (1ULL << VIRTIO_F_VERSION_1)) ? "on" : "off");
379 if ((dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET) &&
380 !(dev->features & (1ULL << VIRTIO_NET_F_MQ))) {
382 * Remove all but first queue pair if MQ hasn't been
383 * negotiated. This is safe because the device is not
384 * running at this stage.
386 while (dev->nr_vring > 2) {
387 struct vhost_virtqueue *vq;
389 vq = dev->virtqueue[--dev->nr_vring];
393 dev->virtqueue[dev->nr_vring] = NULL;
395 cleanup_vq_inflight(dev, vq);
400 vdpa_dev = dev->vdpa_dev;
402 vdpa_dev->ops->set_features(dev->vid);
404 return RTE_VHOST_MSG_RESULT_OK;
408 * The virtio device sends us the size of the descriptor ring.
411 vhost_user_set_vring_num(struct virtio_net **pdev,
412 struct VhostUserMsg *msg,
413 int main_fd __rte_unused)
415 struct virtio_net *dev = *pdev;
416 struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
418 if (validate_msg_fds(msg, 0) != 0)
419 return RTE_VHOST_MSG_RESULT_ERR;
421 vq->size = msg->payload.state.num;
423 /* VIRTIO 1.0, 2.4 Virtqueues says:
425 * Queue Size value is always a power of 2. The maximum Queue Size
428 * VIRTIO 1.1 2.7 Virtqueues says:
430 * Packed virtqueues support up to 2^15 entries each.
432 if (!vq_is_packed(dev)) {
433 if (vq->size & (vq->size - 1)) {
434 VHOST_LOG_CONFIG(ERR,
435 "invalid virtqueue size %u\n", vq->size);
436 return RTE_VHOST_MSG_RESULT_ERR;
440 if (vq->size > 32768) {
441 VHOST_LOG_CONFIG(ERR,
442 "invalid virtqueue size %u\n", vq->size);
443 return RTE_VHOST_MSG_RESULT_ERR;
446 if (dev->dequeue_zero_copy) {
448 vq->last_zmbuf_idx = 0;
449 vq->zmbuf_size = vq->size;
451 rte_free(vq->zmbufs);
452 vq->zmbufs = rte_zmalloc(NULL, vq->zmbuf_size *
453 sizeof(struct zcopy_mbuf), 0);
454 if (vq->zmbufs == NULL) {
455 VHOST_LOG_CONFIG(WARNING,
456 "failed to allocate mem for zero copy; "
457 "zero copy is force disabled\n");
458 dev->dequeue_zero_copy = 0;
460 TAILQ_INIT(&vq->zmbuf_list);
463 if (vq_is_packed(dev)) {
464 if (vq->shadow_used_packed)
465 rte_free(vq->shadow_used_packed);
466 vq->shadow_used_packed = rte_malloc(NULL,
468 sizeof(struct vring_used_elem_packed),
469 RTE_CACHE_LINE_SIZE);
470 if (!vq->shadow_used_packed) {
471 VHOST_LOG_CONFIG(ERR,
472 "failed to allocate memory for shadow used ring.\n");
473 return RTE_VHOST_MSG_RESULT_ERR;
477 if (vq->shadow_used_split)
478 rte_free(vq->shadow_used_split);
480 vq->shadow_used_split = rte_malloc(NULL,
481 vq->size * sizeof(struct vring_used_elem),
482 RTE_CACHE_LINE_SIZE);
484 if (!vq->shadow_used_split) {
485 VHOST_LOG_CONFIG(ERR,
486 "failed to allocate memory for vq internal data.\n");
487 return RTE_VHOST_MSG_RESULT_ERR;
491 if (vq->batch_copy_elems)
492 rte_free(vq->batch_copy_elems);
493 vq->batch_copy_elems = rte_malloc(NULL,
494 vq->size * sizeof(struct batch_copy_elem),
495 RTE_CACHE_LINE_SIZE);
496 if (!vq->batch_copy_elems) {
497 VHOST_LOG_CONFIG(ERR,
498 "failed to allocate memory for batching copy.\n");
499 return RTE_VHOST_MSG_RESULT_ERR;
502 return RTE_VHOST_MSG_RESULT_OK;
506 * Reallocate virtio_dev and vhost_virtqueue data structure to make them on the
507 * same numa node as the memory of vring descriptor.
509 #ifdef RTE_LIBRTE_VHOST_NUMA
510 static struct virtio_net*
511 numa_realloc(struct virtio_net *dev, int index)
513 int oldnode, newnode;
514 struct virtio_net *old_dev;
515 struct vhost_virtqueue *old_vq, *vq;
516 struct zcopy_mbuf *new_zmbuf;
517 struct vring_used_elem *new_shadow_used_split;
518 struct vring_used_elem_packed *new_shadow_used_packed;
519 struct batch_copy_elem *new_batch_copy_elems;
522 if (dev->flags & VIRTIO_DEV_RUNNING)
526 vq = old_vq = dev->virtqueue[index];
528 ret = get_mempolicy(&newnode, NULL, 0, old_vq->desc,
529 MPOL_F_NODE | MPOL_F_ADDR);
531 /* check if we need to reallocate vq */
532 ret |= get_mempolicy(&oldnode, NULL, 0, old_vq,
533 MPOL_F_NODE | MPOL_F_ADDR);
535 VHOST_LOG_CONFIG(ERR,
536 "Unable to get vq numa information.\n");
539 if (oldnode != newnode) {
540 VHOST_LOG_CONFIG(INFO,
541 "reallocate vq from %d to %d node\n", oldnode, newnode);
542 vq = rte_malloc_socket(NULL, sizeof(*vq), 0, newnode);
546 memcpy(vq, old_vq, sizeof(*vq));
547 TAILQ_INIT(&vq->zmbuf_list);
549 if (dev->dequeue_zero_copy) {
550 new_zmbuf = rte_malloc_socket(NULL, vq->zmbuf_size *
551 sizeof(struct zcopy_mbuf), 0, newnode);
553 rte_free(vq->zmbufs);
554 vq->zmbufs = new_zmbuf;
558 if (vq_is_packed(dev)) {
559 new_shadow_used_packed = rte_malloc_socket(NULL,
561 sizeof(struct vring_used_elem_packed),
564 if (new_shadow_used_packed) {
565 rte_free(vq->shadow_used_packed);
566 vq->shadow_used_packed = new_shadow_used_packed;
569 new_shadow_used_split = rte_malloc_socket(NULL,
571 sizeof(struct vring_used_elem),
574 if (new_shadow_used_split) {
575 rte_free(vq->shadow_used_split);
576 vq->shadow_used_split = new_shadow_used_split;
580 new_batch_copy_elems = rte_malloc_socket(NULL,
581 vq->size * sizeof(struct batch_copy_elem),
584 if (new_batch_copy_elems) {
585 rte_free(vq->batch_copy_elems);
586 vq->batch_copy_elems = new_batch_copy_elems;
592 /* check if we need to reallocate dev */
593 ret = get_mempolicy(&oldnode, NULL, 0, old_dev,
594 MPOL_F_NODE | MPOL_F_ADDR);
596 VHOST_LOG_CONFIG(ERR,
597 "Unable to get dev numa information.\n");
600 if (oldnode != newnode) {
601 VHOST_LOG_CONFIG(INFO,
602 "reallocate dev from %d to %d node\n",
604 dev = rte_malloc_socket(NULL, sizeof(*dev), 0, newnode);
610 memcpy(dev, old_dev, sizeof(*dev));
615 dev->virtqueue[index] = vq;
616 vhost_devices[dev->vid] = dev;
619 vhost_user_iotlb_init(dev, index);
624 static struct virtio_net*
625 numa_realloc(struct virtio_net *dev, int index __rte_unused)
631 /* Converts QEMU virtual address to Vhost virtual address. */
633 qva_to_vva(struct virtio_net *dev, uint64_t qva, uint64_t *len)
635 struct rte_vhost_mem_region *r;
638 if (unlikely(!dev || !dev->mem))
641 /* Find the region where the address lives. */
642 for (i = 0; i < dev->mem->nregions; i++) {
643 r = &dev->mem->regions[i];
645 if (qva >= r->guest_user_addr &&
646 qva < r->guest_user_addr + r->size) {
648 if (unlikely(*len > r->guest_user_addr + r->size - qva))
649 *len = r->guest_user_addr + r->size - qva;
651 return qva - r->guest_user_addr +
663 * Converts ring address to Vhost virtual address.
664 * If IOMMU is enabled, the ring address is a guest IO virtual address,
665 * else it is a QEMU virtual address.
668 ring_addr_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
669 uint64_t ra, uint64_t *size)
671 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) {
674 vhost_user_iotlb_rd_lock(vq);
675 vva = vhost_iova_to_vva(dev, vq, ra,
676 size, VHOST_ACCESS_RW);
677 vhost_user_iotlb_rd_unlock(vq);
682 return qva_to_vva(dev, ra, size);
686 log_addr_to_gpa(struct virtio_net *dev, struct vhost_virtqueue *vq)
690 vhost_user_iotlb_rd_lock(vq);
691 log_gpa = translate_log_addr(dev, vq, vq->ring_addrs.log_guest_addr);
692 vhost_user_iotlb_rd_unlock(vq);
697 static struct virtio_net *
698 translate_ring_addresses(struct virtio_net *dev, int vq_index)
700 struct vhost_virtqueue *vq = dev->virtqueue[vq_index];
701 struct vhost_vring_addr *addr = &vq->ring_addrs;
702 uint64_t len, expected_len;
704 if (addr->flags & (1 << VHOST_VRING_F_LOG)) {
706 log_addr_to_gpa(dev, vq);
707 if (vq->log_guest_addr == 0) {
708 VHOST_LOG_CONFIG(DEBUG,
709 "(%d) failed to map log_guest_addr.\n",
715 if (vq_is_packed(dev)) {
716 len = sizeof(struct vring_packed_desc) * vq->size;
717 vq->desc_packed = (struct vring_packed_desc *)(uintptr_t)
718 ring_addr_to_vva(dev, vq, addr->desc_user_addr, &len);
719 if (vq->desc_packed == NULL ||
720 len != sizeof(struct vring_packed_desc) *
722 VHOST_LOG_CONFIG(DEBUG,
723 "(%d) failed to map desc_packed ring.\n",
728 dev = numa_realloc(dev, vq_index);
729 vq = dev->virtqueue[vq_index];
730 addr = &vq->ring_addrs;
732 len = sizeof(struct vring_packed_desc_event);
733 vq->driver_event = (struct vring_packed_desc_event *)
734 (uintptr_t)ring_addr_to_vva(dev,
735 vq, addr->avail_user_addr, &len);
736 if (vq->driver_event == NULL ||
737 len != sizeof(struct vring_packed_desc_event)) {
738 VHOST_LOG_CONFIG(DEBUG,
739 "(%d) failed to find driver area address.\n",
744 len = sizeof(struct vring_packed_desc_event);
745 vq->device_event = (struct vring_packed_desc_event *)
746 (uintptr_t)ring_addr_to_vva(dev,
747 vq, addr->used_user_addr, &len);
748 if (vq->device_event == NULL ||
749 len != sizeof(struct vring_packed_desc_event)) {
750 VHOST_LOG_CONFIG(DEBUG,
751 "(%d) failed to find device area address.\n",
760 /* The addresses are converted from QEMU virtual to Vhost virtual. */
761 if (vq->desc && vq->avail && vq->used)
764 len = sizeof(struct vring_desc) * vq->size;
765 vq->desc = (struct vring_desc *)(uintptr_t)ring_addr_to_vva(dev,
766 vq, addr->desc_user_addr, &len);
767 if (vq->desc == 0 || len != sizeof(struct vring_desc) * vq->size) {
768 VHOST_LOG_CONFIG(DEBUG,
769 "(%d) failed to map desc ring.\n",
774 dev = numa_realloc(dev, vq_index);
775 vq = dev->virtqueue[vq_index];
776 addr = &vq->ring_addrs;
778 len = sizeof(struct vring_avail) + sizeof(uint16_t) * vq->size;
779 if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
780 len += sizeof(uint16_t);
782 vq->avail = (struct vring_avail *)(uintptr_t)ring_addr_to_vva(dev,
783 vq, addr->avail_user_addr, &len);
784 if (vq->avail == 0 || len != expected_len) {
785 VHOST_LOG_CONFIG(DEBUG,
786 "(%d) failed to map avail ring.\n",
791 len = sizeof(struct vring_used) +
792 sizeof(struct vring_used_elem) * vq->size;
793 if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
794 len += sizeof(uint16_t);
796 vq->used = (struct vring_used *)(uintptr_t)ring_addr_to_vva(dev,
797 vq, addr->used_user_addr, &len);
798 if (vq->used == 0 || len != expected_len) {
799 VHOST_LOG_CONFIG(DEBUG,
800 "(%d) failed to map used ring.\n",
805 if (vq->last_used_idx != vq->used->idx) {
806 VHOST_LOG_CONFIG(WARNING,
807 "last_used_idx (%u) and vq->used->idx (%u) mismatches; "
808 "some packets maybe resent for Tx and dropped for Rx\n",
809 vq->last_used_idx, vq->used->idx);
810 vq->last_used_idx = vq->used->idx;
811 vq->last_avail_idx = vq->used->idx;
816 VHOST_LOG_CONFIG(DEBUG, "(%d) mapped address desc: %p\n",
818 VHOST_LOG_CONFIG(DEBUG, "(%d) mapped address avail: %p\n",
819 dev->vid, vq->avail);
820 VHOST_LOG_CONFIG(DEBUG, "(%d) mapped address used: %p\n",
822 VHOST_LOG_CONFIG(DEBUG, "(%d) log_guest_addr: %" PRIx64 "\n",
823 dev->vid, vq->log_guest_addr);
829 * The virtio device sends us the desc, used and avail ring addresses.
830 * This function then converts these to our address space.
833 vhost_user_set_vring_addr(struct virtio_net **pdev, struct VhostUserMsg *msg,
834 int main_fd __rte_unused)
836 struct virtio_net *dev = *pdev;
837 struct vhost_virtqueue *vq;
838 struct vhost_vring_addr *addr = &msg->payload.addr;
841 if (validate_msg_fds(msg, 0) != 0)
842 return RTE_VHOST_MSG_RESULT_ERR;
844 if (dev->mem == NULL)
845 return RTE_VHOST_MSG_RESULT_ERR;
847 /* addr->index refers to the queue index. The txq 1, rxq is 0. */
848 vq = dev->virtqueue[msg->payload.addr.index];
850 access_ok = vq->access_ok;
853 * Rings addresses should not be interpreted as long as the ring is not
854 * started and enabled
856 memcpy(&vq->ring_addrs, addr, sizeof(*addr));
858 vring_invalidate(dev, vq);
860 if ((vq->enabled && (dev->features &
861 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) ||
863 dev = translate_ring_addresses(dev, msg->payload.addr.index);
865 return RTE_VHOST_MSG_RESULT_ERR;
870 return RTE_VHOST_MSG_RESULT_OK;
874 * The virtio device sends us the available ring last used index.
877 vhost_user_set_vring_base(struct virtio_net **pdev,
878 struct VhostUserMsg *msg,
879 int main_fd __rte_unused)
881 struct virtio_net *dev = *pdev;
882 struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
883 uint64_t val = msg->payload.state.num;
885 if (validate_msg_fds(msg, 0) != 0)
886 return RTE_VHOST_MSG_RESULT_ERR;
888 if (vq_is_packed(dev)) {
890 * Bit[0:14]: avail index
891 * Bit[15]: avail wrap counter
893 vq->last_avail_idx = val & 0x7fff;
894 vq->avail_wrap_counter = !!(val & (0x1 << 15));
896 * Set used index to same value as available one, as
897 * their values should be the same since ring processing
898 * was stopped at get time.
900 vq->last_used_idx = vq->last_avail_idx;
901 vq->used_wrap_counter = vq->avail_wrap_counter;
903 vq->last_used_idx = msg->payload.state.num;
904 vq->last_avail_idx = msg->payload.state.num;
907 return RTE_VHOST_MSG_RESULT_OK;
911 add_one_guest_page(struct virtio_net *dev, uint64_t guest_phys_addr,
912 uint64_t host_phys_addr, uint64_t size)
914 struct guest_page *page, *last_page;
915 struct guest_page *old_pages;
917 if (dev->nr_guest_pages == dev->max_guest_pages) {
918 dev->max_guest_pages *= 2;
919 old_pages = dev->guest_pages;
920 dev->guest_pages = rte_realloc(dev->guest_pages,
921 dev->max_guest_pages * sizeof(*page),
922 RTE_CACHE_LINE_SIZE);
923 if (dev->guest_pages == NULL) {
924 VHOST_LOG_CONFIG(ERR, "cannot realloc guest_pages\n");
930 if (dev->nr_guest_pages > 0) {
931 last_page = &dev->guest_pages[dev->nr_guest_pages - 1];
932 /* merge if the two pages are continuous */
933 if (host_phys_addr == last_page->host_phys_addr +
935 last_page->size += size;
940 page = &dev->guest_pages[dev->nr_guest_pages++];
941 page->guest_phys_addr = guest_phys_addr;
942 page->host_phys_addr = host_phys_addr;
949 add_guest_pages(struct virtio_net *dev, struct rte_vhost_mem_region *reg,
952 uint64_t reg_size = reg->size;
953 uint64_t host_user_addr = reg->host_user_addr;
954 uint64_t guest_phys_addr = reg->guest_phys_addr;
955 uint64_t host_phys_addr;
958 host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)host_user_addr);
959 size = page_size - (guest_phys_addr & (page_size - 1));
960 size = RTE_MIN(size, reg_size);
962 if (add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size) < 0)
965 host_user_addr += size;
966 guest_phys_addr += size;
969 while (reg_size > 0) {
970 size = RTE_MIN(reg_size, page_size);
971 host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)
973 if (add_one_guest_page(dev, guest_phys_addr, host_phys_addr,
977 host_user_addr += size;
978 guest_phys_addr += size;
982 /* sort guest page array if over binary search threshold */
983 if (dev->nr_guest_pages >= VHOST_BINARY_SEARCH_THRESH) {
984 qsort((void *)dev->guest_pages, dev->nr_guest_pages,
985 sizeof(struct guest_page), guest_page_addrcmp);
991 #ifdef RTE_LIBRTE_VHOST_DEBUG
992 /* TODO: enable it only in debug mode? */
994 dump_guest_pages(struct virtio_net *dev)
997 struct guest_page *page;
999 for (i = 0; i < dev->nr_guest_pages; i++) {
1000 page = &dev->guest_pages[i];
1002 VHOST_LOG_CONFIG(INFO,
1003 "guest physical page region %u\n"
1004 "\t guest_phys_addr: %" PRIx64 "\n"
1005 "\t host_phys_addr : %" PRIx64 "\n"
1006 "\t size : %" PRIx64 "\n",
1008 page->guest_phys_addr,
1009 page->host_phys_addr,
1014 #define dump_guest_pages(dev)
1018 vhost_memory_changed(struct VhostUserMemory *new,
1019 struct rte_vhost_memory *old)
1023 if (new->nregions != old->nregions)
1026 for (i = 0; i < new->nregions; ++i) {
1027 VhostUserMemoryRegion *new_r = &new->regions[i];
1028 struct rte_vhost_mem_region *old_r = &old->regions[i];
1030 if (new_r->guest_phys_addr != old_r->guest_phys_addr)
1032 if (new_r->memory_size != old_r->size)
1034 if (new_r->userspace_addr != old_r->guest_user_addr)
1042 vhost_user_set_mem_table(struct virtio_net **pdev, struct VhostUserMsg *msg,
1045 struct virtio_net *dev = *pdev;
1046 struct VhostUserMemory *memory = &msg->payload.memory;
1047 struct rte_vhost_mem_region *reg;
1050 uint64_t mmap_offset;
1056 if (validate_msg_fds(msg, memory->nregions) != 0)
1057 return RTE_VHOST_MSG_RESULT_ERR;
1059 if (memory->nregions > VHOST_MEMORY_MAX_NREGIONS) {
1060 VHOST_LOG_CONFIG(ERR,
1061 "too many memory regions (%u)\n", memory->nregions);
1062 return RTE_VHOST_MSG_RESULT_ERR;
1065 if (dev->mem && !vhost_memory_changed(memory, dev->mem)) {
1066 VHOST_LOG_CONFIG(INFO,
1067 "(%d) memory regions not changed\n", dev->vid);
1071 return RTE_VHOST_MSG_RESULT_OK;
1075 if (dev->flags & VIRTIO_DEV_VDPA_CONFIGURED) {
1076 struct rte_vdpa_device *vdpa_dev = dev->vdpa_dev;
1078 if (vdpa_dev && vdpa_dev->ops->dev_close)
1079 vdpa_dev->ops->dev_close(dev->vid);
1080 dev->flags &= ~VIRTIO_DEV_VDPA_CONFIGURED;
1082 free_mem_region(dev);
1087 /* Flush IOTLB cache as previous HVAs are now invalid */
1088 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1089 for (i = 0; i < dev->nr_vring; i++)
1090 vhost_user_iotlb_flush_all(dev->virtqueue[i]);
1092 dev->nr_guest_pages = 0;
1093 if (dev->guest_pages == NULL) {
1094 dev->max_guest_pages = 8;
1095 dev->guest_pages = rte_zmalloc(NULL,
1096 dev->max_guest_pages *
1097 sizeof(struct guest_page),
1098 RTE_CACHE_LINE_SIZE);
1099 if (dev->guest_pages == NULL) {
1100 VHOST_LOG_CONFIG(ERR,
1101 "(%d) failed to allocate memory "
1102 "for dev->guest_pages\n",
1104 return RTE_VHOST_MSG_RESULT_ERR;
1108 dev->mem = rte_zmalloc("vhost-mem-table", sizeof(struct rte_vhost_memory) +
1109 sizeof(struct rte_vhost_mem_region) * memory->nregions, 0);
1110 if (dev->mem == NULL) {
1111 VHOST_LOG_CONFIG(ERR,
1112 "(%d) failed to allocate memory for dev->mem\n",
1114 return RTE_VHOST_MSG_RESULT_ERR;
1116 dev->mem->nregions = memory->nregions;
1118 for (i = 0; i < memory->nregions; i++) {
1120 reg = &dev->mem->regions[i];
1122 reg->guest_phys_addr = memory->regions[i].guest_phys_addr;
1123 reg->guest_user_addr = memory->regions[i].userspace_addr;
1124 reg->size = memory->regions[i].memory_size;
1127 mmap_offset = memory->regions[i].mmap_offset;
1129 /* Check for memory_size + mmap_offset overflow */
1130 if (mmap_offset >= -reg->size) {
1131 VHOST_LOG_CONFIG(ERR,
1132 "mmap_offset (%#"PRIx64") and memory_size "
1133 "(%#"PRIx64") overflow\n",
1134 mmap_offset, reg->size);
1138 mmap_size = reg->size + mmap_offset;
1140 /* mmap() without flag of MAP_ANONYMOUS, should be called
1141 * with length argument aligned with hugepagesz at older
1142 * longterm version Linux, like 2.6.32 and 3.2.72, or
1143 * mmap() will fail with EINVAL.
1145 * to avoid failure, make sure in caller to keep length
1148 alignment = get_blk_size(fd);
1149 if (alignment == (uint64_t)-1) {
1150 VHOST_LOG_CONFIG(ERR,
1151 "couldn't get hugepage size through fstat\n");
1154 mmap_size = RTE_ALIGN_CEIL(mmap_size, alignment);
1155 if (mmap_size == 0) {
1157 * It could happen if initial mmap_size + alignment
1158 * overflows the sizeof uint64, which could happen if
1159 * either mmap_size or alignment value is wrong.
1161 * mmap() kernel implementation would return an error,
1162 * but better catch it before and provide useful info
1165 VHOST_LOG_CONFIG(ERR, "mmap size (0x%" PRIx64 ") "
1166 "or alignment (0x%" PRIx64 ") is invalid\n",
1167 reg->size + mmap_offset, alignment);
1171 populate = (dev->dequeue_zero_copy || dev->async_copy) ?
1173 mmap_addr = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE,
1174 MAP_SHARED | populate, fd, 0);
1176 if (mmap_addr == MAP_FAILED) {
1177 VHOST_LOG_CONFIG(ERR,
1178 "mmap region %u failed.\n", i);
1182 reg->mmap_addr = mmap_addr;
1183 reg->mmap_size = mmap_size;
1184 reg->host_user_addr = (uint64_t)(uintptr_t)mmap_addr +
1187 if (dev->dequeue_zero_copy || dev->async_copy)
1188 if (add_guest_pages(dev, reg, alignment) < 0) {
1189 VHOST_LOG_CONFIG(ERR,
1190 "adding guest pages to region %u failed.\n",
1195 VHOST_LOG_CONFIG(INFO,
1196 "guest memory region %u, size: 0x%" PRIx64 "\n"
1197 "\t guest physical addr: 0x%" PRIx64 "\n"
1198 "\t guest virtual addr: 0x%" PRIx64 "\n"
1199 "\t host virtual addr: 0x%" PRIx64 "\n"
1200 "\t mmap addr : 0x%" PRIx64 "\n"
1201 "\t mmap size : 0x%" PRIx64 "\n"
1202 "\t mmap align: 0x%" PRIx64 "\n"
1203 "\t mmap off : 0x%" PRIx64 "\n",
1205 reg->guest_phys_addr,
1206 reg->guest_user_addr,
1207 reg->host_user_addr,
1208 (uint64_t)(uintptr_t)mmap_addr,
1213 if (dev->postcopy_listening) {
1215 * We haven't a better way right now than sharing
1216 * DPDK's virtual address with Qemu, so that Qemu can
1217 * retrieve the region offset when handling userfaults.
1219 memory->regions[i].userspace_addr =
1220 reg->host_user_addr;
1223 if (dev->postcopy_listening) {
1224 /* Send the addresses back to qemu */
1226 send_vhost_reply(main_fd, msg);
1228 /* Wait for qemu to acknolwedge it's got the addresses
1229 * we've got to wait before we're allowed to generate faults.
1231 VhostUserMsg ack_msg;
1232 if (read_vhost_message(main_fd, &ack_msg) <= 0) {
1233 VHOST_LOG_CONFIG(ERR,
1234 "Failed to read qemu ack on postcopy set-mem-table\n");
1238 if (validate_msg_fds(&ack_msg, 0) != 0)
1241 if (ack_msg.request.master != VHOST_USER_SET_MEM_TABLE) {
1242 VHOST_LOG_CONFIG(ERR,
1243 "Bad qemu ack on postcopy set-mem-table (%d)\n",
1244 ack_msg.request.master);
1248 /* Now userfault register and we can use the memory */
1249 for (i = 0; i < memory->nregions; i++) {
1250 #ifdef RTE_LIBRTE_VHOST_POSTCOPY
1251 reg = &dev->mem->regions[i];
1252 struct uffdio_register reg_struct;
1255 * Let's register all the mmap'ed area to ensure
1256 * alignment on page boundary.
1258 reg_struct.range.start =
1259 (uint64_t)(uintptr_t)reg->mmap_addr;
1260 reg_struct.range.len = reg->mmap_size;
1261 reg_struct.mode = UFFDIO_REGISTER_MODE_MISSING;
1263 if (ioctl(dev->postcopy_ufd, UFFDIO_REGISTER,
1265 VHOST_LOG_CONFIG(ERR,
1266 "Failed to register ufd for region %d: (ufd = %d) %s\n",
1267 i, dev->postcopy_ufd,
1271 VHOST_LOG_CONFIG(INFO,
1272 "\t userfaultfd registered for range : "
1273 "%" PRIx64 " - %" PRIx64 "\n",
1274 (uint64_t)reg_struct.range.start,
1275 (uint64_t)reg_struct.range.start +
1276 (uint64_t)reg_struct.range.len - 1);
1283 for (i = 0; i < dev->nr_vring; i++) {
1284 struct vhost_virtqueue *vq = dev->virtqueue[i];
1286 if (vq->desc || vq->avail || vq->used) {
1288 * If the memory table got updated, the ring addresses
1289 * need to be translated again as virtual addresses have
1292 vring_invalidate(dev, vq);
1294 dev = translate_ring_addresses(dev, i);
1304 dump_guest_pages(dev);
1306 return RTE_VHOST_MSG_RESULT_OK;
1309 free_mem_region(dev);
1312 return RTE_VHOST_MSG_RESULT_ERR;
1316 vq_is_ready(struct virtio_net *dev, struct vhost_virtqueue *vq)
1323 if (vq_is_packed(dev))
1324 rings_ok = vq->desc_packed && vq->driver_event &&
1327 rings_ok = vq->desc && vq->avail && vq->used;
1330 vq->kickfd != VIRTIO_UNINITIALIZED_EVENTFD &&
1331 vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD &&
1335 #define VIRTIO_DEV_NUM_VQS_TO_BE_READY 2u
1338 virtio_is_ready(struct virtio_net *dev)
1340 struct vhost_virtqueue *vq;
1343 if (dev->flags & VIRTIO_DEV_READY)
1346 if (dev->nr_vring < VIRTIO_DEV_NUM_VQS_TO_BE_READY)
1349 for (i = 0; i < VIRTIO_DEV_NUM_VQS_TO_BE_READY; i++) {
1350 vq = dev->virtqueue[i];
1352 if (!vq_is_ready(dev, vq))
1356 dev->flags |= VIRTIO_DEV_READY;
1358 if (!(dev->flags & VIRTIO_DEV_RUNNING))
1359 VHOST_LOG_CONFIG(INFO,
1360 "virtio is now ready for processing.\n");
1365 inflight_mem_alloc(const char *name, size_t size, int *fd)
1369 char fname[20] = "/tmp/memfd-XXXXXX";
1372 #ifdef MEMFD_SUPPORTED
1373 mfd = memfd_create(name, MFD_CLOEXEC);
1378 mfd = mkstemp(fname);
1380 VHOST_LOG_CONFIG(ERR,
1381 "failed to get inflight buffer fd\n");
1388 if (ftruncate(mfd, size) == -1) {
1389 VHOST_LOG_CONFIG(ERR,
1390 "failed to alloc inflight buffer\n");
1395 ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, mfd, 0);
1396 if (ptr == MAP_FAILED) {
1397 VHOST_LOG_CONFIG(ERR,
1398 "failed to mmap inflight buffer\n");
1408 get_pervq_shm_size_split(uint16_t queue_size)
1410 return RTE_ALIGN_MUL_CEIL(sizeof(struct rte_vhost_inflight_desc_split) *
1411 queue_size + sizeof(uint64_t) +
1412 sizeof(uint16_t) * 4, INFLIGHT_ALIGNMENT);
1416 get_pervq_shm_size_packed(uint16_t queue_size)
1418 return RTE_ALIGN_MUL_CEIL(sizeof(struct rte_vhost_inflight_desc_packed)
1419 * queue_size + sizeof(uint64_t) +
1420 sizeof(uint16_t) * 6 + sizeof(uint8_t) * 9,
1421 INFLIGHT_ALIGNMENT);
1425 vhost_user_get_inflight_fd(struct virtio_net **pdev,
1427 int main_fd __rte_unused)
1429 struct rte_vhost_inflight_info_packed *inflight_packed;
1430 uint64_t pervq_inflight_size, mmap_size;
1431 uint16_t num_queues, queue_size;
1432 struct virtio_net *dev = *pdev;
1436 if (msg->size != sizeof(msg->payload.inflight)) {
1437 VHOST_LOG_CONFIG(ERR,
1438 "invalid get_inflight_fd message size is %d\n",
1440 return RTE_VHOST_MSG_RESULT_ERR;
1443 if (dev->inflight_info == NULL) {
1444 dev->inflight_info = calloc(1,
1445 sizeof(struct inflight_mem_info));
1446 if (!dev->inflight_info) {
1447 VHOST_LOG_CONFIG(ERR,
1448 "failed to alloc dev inflight area\n");
1449 return RTE_VHOST_MSG_RESULT_ERR;
1451 dev->inflight_info->fd = -1;
1454 num_queues = msg->payload.inflight.num_queues;
1455 queue_size = msg->payload.inflight.queue_size;
1457 VHOST_LOG_CONFIG(INFO, "get_inflight_fd num_queues: %u\n",
1458 msg->payload.inflight.num_queues);
1459 VHOST_LOG_CONFIG(INFO, "get_inflight_fd queue_size: %u\n",
1460 msg->payload.inflight.queue_size);
1462 if (vq_is_packed(dev))
1463 pervq_inflight_size = get_pervq_shm_size_packed(queue_size);
1465 pervq_inflight_size = get_pervq_shm_size_split(queue_size);
1467 mmap_size = num_queues * pervq_inflight_size;
1468 addr = inflight_mem_alloc("vhost-inflight", mmap_size, &fd);
1470 VHOST_LOG_CONFIG(ERR,
1471 "failed to alloc vhost inflight area\n");
1472 msg->payload.inflight.mmap_size = 0;
1473 return RTE_VHOST_MSG_RESULT_ERR;
1475 memset(addr, 0, mmap_size);
1477 if (dev->inflight_info->addr) {
1478 munmap(dev->inflight_info->addr, dev->inflight_info->size);
1479 dev->inflight_info->addr = NULL;
1482 if (dev->inflight_info->fd >= 0) {
1483 close(dev->inflight_info->fd);
1484 dev->inflight_info->fd = -1;
1487 dev->inflight_info->addr = addr;
1488 dev->inflight_info->size = msg->payload.inflight.mmap_size = mmap_size;
1489 dev->inflight_info->fd = msg->fds[0] = fd;
1490 msg->payload.inflight.mmap_offset = 0;
1493 if (vq_is_packed(dev)) {
1494 for (i = 0; i < num_queues; i++) {
1496 (struct rte_vhost_inflight_info_packed *)addr;
1497 inflight_packed->used_wrap_counter = 1;
1498 inflight_packed->old_used_wrap_counter = 1;
1499 for (j = 0; j < queue_size; j++)
1500 inflight_packed->desc[j].next = j + 1;
1501 addr = (void *)((char *)addr + pervq_inflight_size);
1505 VHOST_LOG_CONFIG(INFO,
1506 "send inflight mmap_size: %"PRIu64"\n",
1507 msg->payload.inflight.mmap_size);
1508 VHOST_LOG_CONFIG(INFO,
1509 "send inflight mmap_offset: %"PRIu64"\n",
1510 msg->payload.inflight.mmap_offset);
1511 VHOST_LOG_CONFIG(INFO,
1512 "send inflight fd: %d\n", msg->fds[0]);
1514 return RTE_VHOST_MSG_RESULT_REPLY;
1518 vhost_user_set_inflight_fd(struct virtio_net **pdev, VhostUserMsg *msg,
1519 int main_fd __rte_unused)
1521 uint64_t mmap_size, mmap_offset;
1522 uint16_t num_queues, queue_size;
1523 struct virtio_net *dev = *pdev;
1524 uint32_t pervq_inflight_size;
1525 struct vhost_virtqueue *vq;
1530 if (msg->size != sizeof(msg->payload.inflight) || fd < 0) {
1531 VHOST_LOG_CONFIG(ERR,
1532 "invalid set_inflight_fd message size is %d,fd is %d\n",
1534 return RTE_VHOST_MSG_RESULT_ERR;
1537 mmap_size = msg->payload.inflight.mmap_size;
1538 mmap_offset = msg->payload.inflight.mmap_offset;
1539 num_queues = msg->payload.inflight.num_queues;
1540 queue_size = msg->payload.inflight.queue_size;
1542 if (vq_is_packed(dev))
1543 pervq_inflight_size = get_pervq_shm_size_packed(queue_size);
1545 pervq_inflight_size = get_pervq_shm_size_split(queue_size);
1547 VHOST_LOG_CONFIG(INFO,
1548 "set_inflight_fd mmap_size: %"PRIu64"\n", mmap_size);
1549 VHOST_LOG_CONFIG(INFO,
1550 "set_inflight_fd mmap_offset: %"PRIu64"\n", mmap_offset);
1551 VHOST_LOG_CONFIG(INFO,
1552 "set_inflight_fd num_queues: %u\n", num_queues);
1553 VHOST_LOG_CONFIG(INFO,
1554 "set_inflight_fd queue_size: %u\n", queue_size);
1555 VHOST_LOG_CONFIG(INFO,
1556 "set_inflight_fd fd: %d\n", fd);
1557 VHOST_LOG_CONFIG(INFO,
1558 "set_inflight_fd pervq_inflight_size: %d\n",
1559 pervq_inflight_size);
1561 if (!dev->inflight_info) {
1562 dev->inflight_info = calloc(1,
1563 sizeof(struct inflight_mem_info));
1564 if (dev->inflight_info == NULL) {
1565 VHOST_LOG_CONFIG(ERR,
1566 "failed to alloc dev inflight area\n");
1567 return RTE_VHOST_MSG_RESULT_ERR;
1569 dev->inflight_info->fd = -1;
1572 if (dev->inflight_info->addr) {
1573 munmap(dev->inflight_info->addr, dev->inflight_info->size);
1574 dev->inflight_info->addr = NULL;
1577 addr = mmap(0, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED,
1579 if (addr == MAP_FAILED) {
1580 VHOST_LOG_CONFIG(ERR, "failed to mmap share memory.\n");
1581 return RTE_VHOST_MSG_RESULT_ERR;
1584 if (dev->inflight_info->fd >= 0) {
1585 close(dev->inflight_info->fd);
1586 dev->inflight_info->fd = -1;
1589 dev->inflight_info->fd = fd;
1590 dev->inflight_info->addr = addr;
1591 dev->inflight_info->size = mmap_size;
1593 for (i = 0; i < num_queues; i++) {
1594 vq = dev->virtqueue[i];
1595 if (vq_is_packed(dev)) {
1596 vq->inflight_packed = addr;
1597 vq->inflight_packed->desc_num = queue_size;
1599 vq->inflight_split = addr;
1600 vq->inflight_split->desc_num = queue_size;
1602 addr = (void *)((char *)addr + pervq_inflight_size);
1605 return RTE_VHOST_MSG_RESULT_OK;
1609 vhost_user_set_vring_call(struct virtio_net **pdev, struct VhostUserMsg *msg,
1610 int main_fd __rte_unused)
1612 struct virtio_net *dev = *pdev;
1613 struct vhost_vring_file file;
1614 struct vhost_virtqueue *vq;
1617 expected_fds = (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
1618 if (validate_msg_fds(msg, expected_fds) != 0)
1619 return RTE_VHOST_MSG_RESULT_ERR;
1621 file.index = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
1622 if (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
1623 file.fd = VIRTIO_INVALID_EVENTFD;
1625 file.fd = msg->fds[0];
1626 VHOST_LOG_CONFIG(INFO,
1627 "vring call idx:%d file:%d\n", file.index, file.fd);
1629 vq = dev->virtqueue[file.index];
1632 vhost_user_notify_queue_state(dev, file.index, 0);
1636 if (vq->callfd >= 0)
1639 vq->callfd = file.fd;
1641 return RTE_VHOST_MSG_RESULT_OK;
1644 static int vhost_user_set_vring_err(struct virtio_net **pdev __rte_unused,
1645 struct VhostUserMsg *msg,
1646 int main_fd __rte_unused)
1650 expected_fds = (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
1651 if (validate_msg_fds(msg, expected_fds) != 0)
1652 return RTE_VHOST_MSG_RESULT_ERR;
1654 if (!(msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK))
1656 VHOST_LOG_CONFIG(INFO, "not implemented\n");
1658 return RTE_VHOST_MSG_RESULT_OK;
1662 resubmit_desc_compare(const void *a, const void *b)
1664 const struct rte_vhost_resubmit_desc *desc0 = a;
1665 const struct rte_vhost_resubmit_desc *desc1 = b;
1667 if (desc1->counter > desc0->counter)
1674 vhost_check_queue_inflights_split(struct virtio_net *dev,
1675 struct vhost_virtqueue *vq)
1678 uint16_t resubmit_num = 0, last_io, num;
1679 struct vring_used *used = vq->used;
1680 struct rte_vhost_resubmit_info *resubmit;
1681 struct rte_vhost_inflight_info_split *inflight_split;
1683 if (!(dev->protocol_features &
1684 (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
1685 return RTE_VHOST_MSG_RESULT_OK;
1687 /* The frontend may still not support the inflight feature
1688 * although we negotiate the protocol feature.
1690 if ((!vq->inflight_split))
1691 return RTE_VHOST_MSG_RESULT_OK;
1693 if (!vq->inflight_split->version) {
1694 vq->inflight_split->version = INFLIGHT_VERSION;
1695 return RTE_VHOST_MSG_RESULT_OK;
1698 if (vq->resubmit_inflight)
1699 return RTE_VHOST_MSG_RESULT_OK;
1701 inflight_split = vq->inflight_split;
1702 vq->global_counter = 0;
1703 last_io = inflight_split->last_inflight_io;
1705 if (inflight_split->used_idx != used->idx) {
1706 inflight_split->desc[last_io].inflight = 0;
1708 inflight_split->used_idx = used->idx;
1711 for (i = 0; i < inflight_split->desc_num; i++) {
1712 if (inflight_split->desc[i].inflight == 1)
1716 vq->last_avail_idx += resubmit_num;
1719 resubmit = calloc(1, sizeof(struct rte_vhost_resubmit_info));
1721 VHOST_LOG_CONFIG(ERR,
1722 "failed to allocate memory for resubmit info.\n");
1723 return RTE_VHOST_MSG_RESULT_ERR;
1726 resubmit->resubmit_list = calloc(resubmit_num,
1727 sizeof(struct rte_vhost_resubmit_desc));
1728 if (!resubmit->resubmit_list) {
1729 VHOST_LOG_CONFIG(ERR,
1730 "failed to allocate memory for inflight desc.\n");
1732 return RTE_VHOST_MSG_RESULT_ERR;
1736 for (i = 0; i < vq->inflight_split->desc_num; i++) {
1737 if (vq->inflight_split->desc[i].inflight == 1) {
1738 resubmit->resubmit_list[num].index = i;
1739 resubmit->resubmit_list[num].counter =
1740 inflight_split->desc[i].counter;
1744 resubmit->resubmit_num = num;
1746 if (resubmit->resubmit_num > 1)
1747 qsort(resubmit->resubmit_list, resubmit->resubmit_num,
1748 sizeof(struct rte_vhost_resubmit_desc),
1749 resubmit_desc_compare);
1751 vq->global_counter = resubmit->resubmit_list[0].counter + 1;
1752 vq->resubmit_inflight = resubmit;
1755 return RTE_VHOST_MSG_RESULT_OK;
1759 vhost_check_queue_inflights_packed(struct virtio_net *dev,
1760 struct vhost_virtqueue *vq)
1763 uint16_t resubmit_num = 0, old_used_idx, num;
1764 struct rte_vhost_resubmit_info *resubmit;
1765 struct rte_vhost_inflight_info_packed *inflight_packed;
1767 if (!(dev->protocol_features &
1768 (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
1769 return RTE_VHOST_MSG_RESULT_OK;
1771 /* The frontend may still not support the inflight feature
1772 * although we negotiate the protocol feature.
1774 if ((!vq->inflight_packed))
1775 return RTE_VHOST_MSG_RESULT_OK;
1777 if (!vq->inflight_packed->version) {
1778 vq->inflight_packed->version = INFLIGHT_VERSION;
1779 return RTE_VHOST_MSG_RESULT_OK;
1782 if (vq->resubmit_inflight)
1783 return RTE_VHOST_MSG_RESULT_OK;
1785 inflight_packed = vq->inflight_packed;
1786 vq->global_counter = 0;
1787 old_used_idx = inflight_packed->old_used_idx;
1789 if (inflight_packed->used_idx != old_used_idx) {
1790 if (inflight_packed->desc[old_used_idx].inflight == 0) {
1791 inflight_packed->old_used_idx =
1792 inflight_packed->used_idx;
1793 inflight_packed->old_used_wrap_counter =
1794 inflight_packed->used_wrap_counter;
1795 inflight_packed->old_free_head =
1796 inflight_packed->free_head;
1798 inflight_packed->used_idx =
1799 inflight_packed->old_used_idx;
1800 inflight_packed->used_wrap_counter =
1801 inflight_packed->old_used_wrap_counter;
1802 inflight_packed->free_head =
1803 inflight_packed->old_free_head;
1807 for (i = 0; i < inflight_packed->desc_num; i++) {
1808 if (inflight_packed->desc[i].inflight == 1)
1813 resubmit = calloc(1, sizeof(struct rte_vhost_resubmit_info));
1814 if (resubmit == NULL) {
1815 VHOST_LOG_CONFIG(ERR,
1816 "failed to allocate memory for resubmit info.\n");
1817 return RTE_VHOST_MSG_RESULT_ERR;
1820 resubmit->resubmit_list = calloc(resubmit_num,
1821 sizeof(struct rte_vhost_resubmit_desc));
1822 if (resubmit->resubmit_list == NULL) {
1823 VHOST_LOG_CONFIG(ERR,
1824 "failed to allocate memory for resubmit desc.\n");
1826 return RTE_VHOST_MSG_RESULT_ERR;
1830 for (i = 0; i < inflight_packed->desc_num; i++) {
1831 if (vq->inflight_packed->desc[i].inflight == 1) {
1832 resubmit->resubmit_list[num].index = i;
1833 resubmit->resubmit_list[num].counter =
1834 inflight_packed->desc[i].counter;
1838 resubmit->resubmit_num = num;
1840 if (resubmit->resubmit_num > 1)
1841 qsort(resubmit->resubmit_list, resubmit->resubmit_num,
1842 sizeof(struct rte_vhost_resubmit_desc),
1843 resubmit_desc_compare);
1845 vq->global_counter = resubmit->resubmit_list[0].counter + 1;
1846 vq->resubmit_inflight = resubmit;
1849 return RTE_VHOST_MSG_RESULT_OK;
1853 vhost_user_set_vring_kick(struct virtio_net **pdev, struct VhostUserMsg *msg,
1854 int main_fd __rte_unused)
1856 struct virtio_net *dev = *pdev;
1857 struct vhost_vring_file file;
1858 struct vhost_virtqueue *vq;
1861 expected_fds = (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
1862 if (validate_msg_fds(msg, expected_fds) != 0)
1863 return RTE_VHOST_MSG_RESULT_ERR;
1865 file.index = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
1866 if (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
1867 file.fd = VIRTIO_INVALID_EVENTFD;
1869 file.fd = msg->fds[0];
1870 VHOST_LOG_CONFIG(INFO,
1871 "vring kick idx:%d file:%d\n", file.index, file.fd);
1873 /* Interpret ring addresses only when ring is started. */
1874 dev = translate_ring_addresses(dev, file.index);
1876 return RTE_VHOST_MSG_RESULT_ERR;
1880 vq = dev->virtqueue[file.index];
1883 * When VHOST_USER_F_PROTOCOL_FEATURES is not negotiated,
1884 * the ring starts already enabled. Otherwise, it is enabled via
1885 * the SET_VRING_ENABLE message.
1887 if (!(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) {
1889 if (dev->notify_ops->vring_state_changed)
1890 dev->notify_ops->vring_state_changed(
1891 dev->vid, file.index, 1);
1895 vhost_user_notify_queue_state(dev, file.index, 0);
1899 if (vq->kickfd >= 0)
1901 vq->kickfd = file.fd;
1903 if (vq_is_packed(dev)) {
1904 if (vhost_check_queue_inflights_packed(dev, vq)) {
1905 VHOST_LOG_CONFIG(ERR,
1906 "failed to inflights for vq: %d\n", file.index);
1907 return RTE_VHOST_MSG_RESULT_ERR;
1910 if (vhost_check_queue_inflights_split(dev, vq)) {
1911 VHOST_LOG_CONFIG(ERR,
1912 "failed to inflights for vq: %d\n", file.index);
1913 return RTE_VHOST_MSG_RESULT_ERR;
1917 return RTE_VHOST_MSG_RESULT_OK;
1921 free_zmbufs(struct vhost_virtqueue *vq)
1923 drain_zmbuf_list(vq);
1925 rte_free(vq->zmbufs);
1929 * when virtio is stopped, qemu will send us the GET_VRING_BASE message.
1932 vhost_user_get_vring_base(struct virtio_net **pdev,
1933 struct VhostUserMsg *msg,
1934 int main_fd __rte_unused)
1936 struct virtio_net *dev = *pdev;
1937 struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
1940 if (validate_msg_fds(msg, 0) != 0)
1941 return RTE_VHOST_MSG_RESULT_ERR;
1943 /* We have to stop the queue (virtio) if it is running. */
1944 vhost_destroy_device_notify(dev);
1946 dev->flags &= ~VIRTIO_DEV_READY;
1947 dev->flags &= ~VIRTIO_DEV_VDPA_CONFIGURED;
1949 /* Here we are safe to get the indexes */
1950 if (vq_is_packed(dev)) {
1952 * Bit[0:14]: avail index
1953 * Bit[15]: avail wrap counter
1955 val = vq->last_avail_idx & 0x7fff;
1956 val |= vq->avail_wrap_counter << 15;
1957 msg->payload.state.num = val;
1959 msg->payload.state.num = vq->last_avail_idx;
1962 VHOST_LOG_CONFIG(INFO,
1963 "vring base idx:%d file:%d\n", msg->payload.state.index,
1964 msg->payload.state.num);
1966 * Based on current qemu vhost-user implementation, this message is
1967 * sent and only sent in vhost_vring_stop.
1968 * TODO: cleanup the vring, it isn't usable since here.
1970 if (vq->kickfd >= 0)
1973 vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
1975 if (vq->callfd >= 0)
1978 vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
1980 vq->signalled_used_valid = false;
1982 if (dev->dequeue_zero_copy)
1984 if (vq_is_packed(dev)) {
1985 rte_free(vq->shadow_used_packed);
1986 vq->shadow_used_packed = NULL;
1988 rte_free(vq->shadow_used_split);
1989 vq->shadow_used_split = NULL;
1990 if (vq->async_pkts_pending)
1991 rte_free(vq->async_pkts_pending);
1992 if (vq->async_pending_info)
1993 rte_free(vq->async_pending_info);
1994 vq->async_pkts_pending = NULL;
1995 vq->async_pending_info = NULL;
1998 rte_free(vq->batch_copy_elems);
1999 vq->batch_copy_elems = NULL;
2001 msg->size = sizeof(msg->payload.state);
2004 vring_invalidate(dev, vq);
2006 return RTE_VHOST_MSG_RESULT_REPLY;
2010 * when virtio queues are ready to work, qemu will send us to
2011 * enable the virtio queue pair.
2014 vhost_user_set_vring_enable(struct virtio_net **pdev,
2015 struct VhostUserMsg *msg,
2016 int main_fd __rte_unused)
2018 struct virtio_net *dev = *pdev;
2019 int enable = (int)msg->payload.state.num;
2020 int index = (int)msg->payload.state.index;
2022 if (validate_msg_fds(msg, 0) != 0)
2023 return RTE_VHOST_MSG_RESULT_ERR;
2025 VHOST_LOG_CONFIG(INFO,
2026 "set queue enable: %d to qp idx: %d\n",
2029 if (!enable && dev->virtqueue[index]->async_registered) {
2030 if (dev->virtqueue[index]->async_pkts_inflight_n) {
2031 VHOST_LOG_CONFIG(ERR, "failed to disable vring. "
2032 "async inflight packets must be completed first\n");
2033 return RTE_VHOST_MSG_RESULT_ERR;
2037 /* On disable, rings have to be stopped being processed. */
2038 if (!enable && dev->dequeue_zero_copy)
2039 drain_zmbuf_list(dev->virtqueue[index]);
2041 dev->virtqueue[index]->enabled = enable;
2043 return RTE_VHOST_MSG_RESULT_OK;
2047 vhost_user_get_protocol_features(struct virtio_net **pdev,
2048 struct VhostUserMsg *msg,
2049 int main_fd __rte_unused)
2051 struct virtio_net *dev = *pdev;
2052 uint64_t features, protocol_features;
2054 if (validate_msg_fds(msg, 0) != 0)
2055 return RTE_VHOST_MSG_RESULT_ERR;
2057 rte_vhost_driver_get_features(dev->ifname, &features);
2058 rte_vhost_driver_get_protocol_features(dev->ifname, &protocol_features);
2060 msg->payload.u64 = protocol_features;
2061 msg->size = sizeof(msg->payload.u64);
2064 return RTE_VHOST_MSG_RESULT_REPLY;
2068 vhost_user_set_protocol_features(struct virtio_net **pdev,
2069 struct VhostUserMsg *msg,
2070 int main_fd __rte_unused)
2072 struct virtio_net *dev = *pdev;
2073 uint64_t protocol_features = msg->payload.u64;
2074 uint64_t slave_protocol_features = 0;
2076 if (validate_msg_fds(msg, 0) != 0)
2077 return RTE_VHOST_MSG_RESULT_ERR;
2079 rte_vhost_driver_get_protocol_features(dev->ifname,
2080 &slave_protocol_features);
2081 if (protocol_features & ~slave_protocol_features) {
2082 VHOST_LOG_CONFIG(ERR,
2083 "(%d) received invalid protocol features.\n",
2085 return RTE_VHOST_MSG_RESULT_ERR;
2088 dev->protocol_features = protocol_features;
2089 VHOST_LOG_CONFIG(INFO,
2090 "negotiated Vhost-user protocol features: 0x%" PRIx64 "\n",
2091 dev->protocol_features);
2093 return RTE_VHOST_MSG_RESULT_OK;
2097 vhost_user_set_log_base(struct virtio_net **pdev, struct VhostUserMsg *msg,
2098 int main_fd __rte_unused)
2100 struct virtio_net *dev = *pdev;
2101 int fd = msg->fds[0];
2105 if (validate_msg_fds(msg, 1) != 0)
2106 return RTE_VHOST_MSG_RESULT_ERR;
2109 VHOST_LOG_CONFIG(ERR, "invalid log fd: %d\n", fd);
2110 return RTE_VHOST_MSG_RESULT_ERR;
2113 if (msg->size != sizeof(VhostUserLog)) {
2114 VHOST_LOG_CONFIG(ERR,
2115 "invalid log base msg size: %"PRId32" != %d\n",
2116 msg->size, (int)sizeof(VhostUserLog));
2117 return RTE_VHOST_MSG_RESULT_ERR;
2120 size = msg->payload.log.mmap_size;
2121 off = msg->payload.log.mmap_offset;
2123 /* Check for mmap size and offset overflow. */
2125 VHOST_LOG_CONFIG(ERR,
2126 "log offset %#"PRIx64" and log size %#"PRIx64" overflow\n",
2128 return RTE_VHOST_MSG_RESULT_ERR;
2131 VHOST_LOG_CONFIG(INFO,
2132 "log mmap size: %"PRId64", offset: %"PRId64"\n",
2136 * mmap from 0 to workaround a hugepage mmap bug: mmap will
2137 * fail when offset is not page size aligned.
2139 addr = mmap(0, size + off, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
2141 if (addr == MAP_FAILED) {
2142 VHOST_LOG_CONFIG(ERR, "mmap log base failed!\n");
2143 return RTE_VHOST_MSG_RESULT_ERR;
2147 * Free previously mapped log memory on occasionally
2148 * multiple VHOST_USER_SET_LOG_BASE.
2150 if (dev->log_addr) {
2151 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
2153 dev->log_addr = (uint64_t)(uintptr_t)addr;
2154 dev->log_base = dev->log_addr + off;
2155 dev->log_size = size;
2158 * The spec is not clear about it (yet), but QEMU doesn't expect
2159 * any payload in the reply.
2164 return RTE_VHOST_MSG_RESULT_REPLY;
2167 static int vhost_user_set_log_fd(struct virtio_net **pdev __rte_unused,
2168 struct VhostUserMsg *msg,
2169 int main_fd __rte_unused)
2171 if (validate_msg_fds(msg, 1) != 0)
2172 return RTE_VHOST_MSG_RESULT_ERR;
2175 VHOST_LOG_CONFIG(INFO, "not implemented.\n");
2177 return RTE_VHOST_MSG_RESULT_OK;
2181 * An rarp packet is constructed and broadcasted to notify switches about
2182 * the new location of the migrated VM, so that packets from outside will
2183 * not be lost after migration.
2185 * However, we don't actually "send" a rarp packet here, instead, we set
2186 * a flag 'broadcast_rarp' to let rte_vhost_dequeue_burst() inject it.
2189 vhost_user_send_rarp(struct virtio_net **pdev, struct VhostUserMsg *msg,
2190 int main_fd __rte_unused)
2192 struct virtio_net *dev = *pdev;
2193 uint8_t *mac = (uint8_t *)&msg->payload.u64;
2194 struct rte_vdpa_device *vdpa_dev;
2196 if (validate_msg_fds(msg, 0) != 0)
2197 return RTE_VHOST_MSG_RESULT_ERR;
2199 VHOST_LOG_CONFIG(DEBUG,
2200 ":: mac: %02x:%02x:%02x:%02x:%02x:%02x\n",
2201 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
2202 memcpy(dev->mac.addr_bytes, mac, 6);
2205 * Set the flag to inject a RARP broadcast packet at
2206 * rte_vhost_dequeue_burst().
2208 * __ATOMIC_RELEASE ordering is for making sure the mac is
2209 * copied before the flag is set.
2211 __atomic_store_n(&dev->broadcast_rarp, 1, __ATOMIC_RELEASE);
2212 vdpa_dev = dev->vdpa_dev;
2213 if (vdpa_dev && vdpa_dev->ops->migration_done)
2214 vdpa_dev->ops->migration_done(dev->vid);
2216 return RTE_VHOST_MSG_RESULT_OK;
2220 vhost_user_net_set_mtu(struct virtio_net **pdev, struct VhostUserMsg *msg,
2221 int main_fd __rte_unused)
2223 struct virtio_net *dev = *pdev;
2225 if (validate_msg_fds(msg, 0) != 0)
2226 return RTE_VHOST_MSG_RESULT_ERR;
2228 if (msg->payload.u64 < VIRTIO_MIN_MTU ||
2229 msg->payload.u64 > VIRTIO_MAX_MTU) {
2230 VHOST_LOG_CONFIG(ERR, "Invalid MTU size (%"PRIu64")\n",
2233 return RTE_VHOST_MSG_RESULT_ERR;
2236 dev->mtu = msg->payload.u64;
2238 return RTE_VHOST_MSG_RESULT_OK;
2242 vhost_user_set_req_fd(struct virtio_net **pdev, struct VhostUserMsg *msg,
2243 int main_fd __rte_unused)
2245 struct virtio_net *dev = *pdev;
2246 int fd = msg->fds[0];
2248 if (validate_msg_fds(msg, 1) != 0)
2249 return RTE_VHOST_MSG_RESULT_ERR;
2252 VHOST_LOG_CONFIG(ERR,
2253 "Invalid file descriptor for slave channel (%d)\n",
2255 return RTE_VHOST_MSG_RESULT_ERR;
2258 if (dev->slave_req_fd >= 0)
2259 close(dev->slave_req_fd);
2261 dev->slave_req_fd = fd;
2263 return RTE_VHOST_MSG_RESULT_OK;
2267 is_vring_iotlb_split(struct vhost_virtqueue *vq, struct vhost_iotlb_msg *imsg)
2269 struct vhost_vring_addr *ra;
2270 uint64_t start, end, len;
2273 end = start + imsg->size;
2275 ra = &vq->ring_addrs;
2276 len = sizeof(struct vring_desc) * vq->size;
2277 if (ra->desc_user_addr < end && (ra->desc_user_addr + len) > start)
2280 len = sizeof(struct vring_avail) + sizeof(uint16_t) * vq->size;
2281 if (ra->avail_user_addr < end && (ra->avail_user_addr + len) > start)
2284 len = sizeof(struct vring_used) +
2285 sizeof(struct vring_used_elem) * vq->size;
2286 if (ra->used_user_addr < end && (ra->used_user_addr + len) > start)
2289 if (ra->flags & (1 << VHOST_VRING_F_LOG)) {
2290 len = sizeof(uint64_t);
2291 if (ra->log_guest_addr < end &&
2292 (ra->log_guest_addr + len) > start)
2300 is_vring_iotlb_packed(struct vhost_virtqueue *vq, struct vhost_iotlb_msg *imsg)
2302 struct vhost_vring_addr *ra;
2303 uint64_t start, end, len;
2306 end = start + imsg->size;
2308 ra = &vq->ring_addrs;
2309 len = sizeof(struct vring_packed_desc) * vq->size;
2310 if (ra->desc_user_addr < end && (ra->desc_user_addr + len) > start)
2313 len = sizeof(struct vring_packed_desc_event);
2314 if (ra->avail_user_addr < end && (ra->avail_user_addr + len) > start)
2317 len = sizeof(struct vring_packed_desc_event);
2318 if (ra->used_user_addr < end && (ra->used_user_addr + len) > start)
2321 if (ra->flags & (1 << VHOST_VRING_F_LOG)) {
2322 len = sizeof(uint64_t);
2323 if (ra->log_guest_addr < end &&
2324 (ra->log_guest_addr + len) > start)
2331 static int is_vring_iotlb(struct virtio_net *dev,
2332 struct vhost_virtqueue *vq,
2333 struct vhost_iotlb_msg *imsg)
2335 if (vq_is_packed(dev))
2336 return is_vring_iotlb_packed(vq, imsg);
2338 return is_vring_iotlb_split(vq, imsg);
2342 vhost_user_iotlb_msg(struct virtio_net **pdev, struct VhostUserMsg *msg,
2343 int main_fd __rte_unused)
2345 struct virtio_net *dev = *pdev;
2346 struct vhost_iotlb_msg *imsg = &msg->payload.iotlb;
2350 if (validate_msg_fds(msg, 0) != 0)
2351 return RTE_VHOST_MSG_RESULT_ERR;
2353 switch (imsg->type) {
2354 case VHOST_IOTLB_UPDATE:
2356 vva = qva_to_vva(dev, imsg->uaddr, &len);
2358 return RTE_VHOST_MSG_RESULT_ERR;
2360 for (i = 0; i < dev->nr_vring; i++) {
2361 struct vhost_virtqueue *vq = dev->virtqueue[i];
2363 vhost_user_iotlb_cache_insert(vq, imsg->iova, vva,
2366 if (is_vring_iotlb(dev, vq, imsg))
2367 *pdev = dev = translate_ring_addresses(dev, i);
2370 case VHOST_IOTLB_INVALIDATE:
2371 for (i = 0; i < dev->nr_vring; i++) {
2372 struct vhost_virtqueue *vq = dev->virtqueue[i];
2374 vhost_user_iotlb_cache_remove(vq, imsg->iova,
2377 if (is_vring_iotlb(dev, vq, imsg))
2378 vring_invalidate(dev, vq);
2382 VHOST_LOG_CONFIG(ERR, "Invalid IOTLB message type (%d)\n",
2384 return RTE_VHOST_MSG_RESULT_ERR;
2387 return RTE_VHOST_MSG_RESULT_OK;
2391 vhost_user_set_postcopy_advise(struct virtio_net **pdev,
2392 struct VhostUserMsg *msg,
2393 int main_fd __rte_unused)
2395 struct virtio_net *dev = *pdev;
2396 #ifdef RTE_LIBRTE_VHOST_POSTCOPY
2397 struct uffdio_api api_struct;
2399 if (validate_msg_fds(msg, 0) != 0)
2400 return RTE_VHOST_MSG_RESULT_ERR;
2402 dev->postcopy_ufd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK);
2404 if (dev->postcopy_ufd == -1) {
2405 VHOST_LOG_CONFIG(ERR, "Userfaultfd not available: %s\n",
2407 return RTE_VHOST_MSG_RESULT_ERR;
2409 api_struct.api = UFFD_API;
2410 api_struct.features = 0;
2411 if (ioctl(dev->postcopy_ufd, UFFDIO_API, &api_struct)) {
2412 VHOST_LOG_CONFIG(ERR, "UFFDIO_API ioctl failure: %s\n",
2414 close(dev->postcopy_ufd);
2415 dev->postcopy_ufd = -1;
2416 return RTE_VHOST_MSG_RESULT_ERR;
2418 msg->fds[0] = dev->postcopy_ufd;
2421 return RTE_VHOST_MSG_RESULT_REPLY;
2423 dev->postcopy_ufd = -1;
2426 return RTE_VHOST_MSG_RESULT_ERR;
2431 vhost_user_set_postcopy_listen(struct virtio_net **pdev,
2432 struct VhostUserMsg *msg __rte_unused,
2433 int main_fd __rte_unused)
2435 struct virtio_net *dev = *pdev;
2437 if (validate_msg_fds(msg, 0) != 0)
2438 return RTE_VHOST_MSG_RESULT_ERR;
2440 if (dev->mem && dev->mem->nregions) {
2441 VHOST_LOG_CONFIG(ERR,
2442 "Regions already registered at postcopy-listen\n");
2443 return RTE_VHOST_MSG_RESULT_ERR;
2445 dev->postcopy_listening = 1;
2447 return RTE_VHOST_MSG_RESULT_OK;
2451 vhost_user_postcopy_end(struct virtio_net **pdev, struct VhostUserMsg *msg,
2452 int main_fd __rte_unused)
2454 struct virtio_net *dev = *pdev;
2456 if (validate_msg_fds(msg, 0) != 0)
2457 return RTE_VHOST_MSG_RESULT_ERR;
2459 dev->postcopy_listening = 0;
2460 if (dev->postcopy_ufd >= 0) {
2461 close(dev->postcopy_ufd);
2462 dev->postcopy_ufd = -1;
2465 msg->payload.u64 = 0;
2466 msg->size = sizeof(msg->payload.u64);
2469 return RTE_VHOST_MSG_RESULT_REPLY;
2472 typedef int (*vhost_message_handler_t)(struct virtio_net **pdev,
2473 struct VhostUserMsg *msg,
2475 static vhost_message_handler_t vhost_message_handlers[VHOST_USER_MAX] = {
2476 [VHOST_USER_NONE] = NULL,
2477 [VHOST_USER_GET_FEATURES] = vhost_user_get_features,
2478 [VHOST_USER_SET_FEATURES] = vhost_user_set_features,
2479 [VHOST_USER_SET_OWNER] = vhost_user_set_owner,
2480 [VHOST_USER_RESET_OWNER] = vhost_user_reset_owner,
2481 [VHOST_USER_SET_MEM_TABLE] = vhost_user_set_mem_table,
2482 [VHOST_USER_SET_LOG_BASE] = vhost_user_set_log_base,
2483 [VHOST_USER_SET_LOG_FD] = vhost_user_set_log_fd,
2484 [VHOST_USER_SET_VRING_NUM] = vhost_user_set_vring_num,
2485 [VHOST_USER_SET_VRING_ADDR] = vhost_user_set_vring_addr,
2486 [VHOST_USER_SET_VRING_BASE] = vhost_user_set_vring_base,
2487 [VHOST_USER_GET_VRING_BASE] = vhost_user_get_vring_base,
2488 [VHOST_USER_SET_VRING_KICK] = vhost_user_set_vring_kick,
2489 [VHOST_USER_SET_VRING_CALL] = vhost_user_set_vring_call,
2490 [VHOST_USER_SET_VRING_ERR] = vhost_user_set_vring_err,
2491 [VHOST_USER_GET_PROTOCOL_FEATURES] = vhost_user_get_protocol_features,
2492 [VHOST_USER_SET_PROTOCOL_FEATURES] = vhost_user_set_protocol_features,
2493 [VHOST_USER_GET_QUEUE_NUM] = vhost_user_get_queue_num,
2494 [VHOST_USER_SET_VRING_ENABLE] = vhost_user_set_vring_enable,
2495 [VHOST_USER_SEND_RARP] = vhost_user_send_rarp,
2496 [VHOST_USER_NET_SET_MTU] = vhost_user_net_set_mtu,
2497 [VHOST_USER_SET_SLAVE_REQ_FD] = vhost_user_set_req_fd,
2498 [VHOST_USER_IOTLB_MSG] = vhost_user_iotlb_msg,
2499 [VHOST_USER_POSTCOPY_ADVISE] = vhost_user_set_postcopy_advise,
2500 [VHOST_USER_POSTCOPY_LISTEN] = vhost_user_set_postcopy_listen,
2501 [VHOST_USER_POSTCOPY_END] = vhost_user_postcopy_end,
2502 [VHOST_USER_GET_INFLIGHT_FD] = vhost_user_get_inflight_fd,
2503 [VHOST_USER_SET_INFLIGHT_FD] = vhost_user_set_inflight_fd,
2506 /* return bytes# of read on success or negative val on failure. */
2508 read_vhost_message(int sockfd, struct VhostUserMsg *msg)
2512 ret = read_fd_message(sockfd, (char *)msg, VHOST_USER_HDR_SIZE,
2513 msg->fds, VHOST_MEMORY_MAX_NREGIONS, &msg->fd_num);
2516 } else if (ret != VHOST_USER_HDR_SIZE) {
2517 VHOST_LOG_CONFIG(ERR, "Unexpected header size read\n");
2523 if (msg->size > sizeof(msg->payload)) {
2524 VHOST_LOG_CONFIG(ERR,
2525 "invalid msg size: %d\n", msg->size);
2528 ret = read(sockfd, &msg->payload, msg->size);
2531 if (ret != (int)msg->size) {
2532 VHOST_LOG_CONFIG(ERR,
2533 "read control message failed\n");
2542 send_vhost_message(int sockfd, struct VhostUserMsg *msg)
2547 return send_fd_message(sockfd, (char *)msg,
2548 VHOST_USER_HDR_SIZE + msg->size, msg->fds, msg->fd_num);
2552 send_vhost_reply(int sockfd, struct VhostUserMsg *msg)
2557 msg->flags &= ~VHOST_USER_VERSION_MASK;
2558 msg->flags &= ~VHOST_USER_NEED_REPLY;
2559 msg->flags |= VHOST_USER_VERSION;
2560 msg->flags |= VHOST_USER_REPLY_MASK;
2562 return send_vhost_message(sockfd, msg);
2566 send_vhost_slave_message(struct virtio_net *dev, struct VhostUserMsg *msg)
2570 if (msg->flags & VHOST_USER_NEED_REPLY)
2571 rte_spinlock_lock(&dev->slave_req_lock);
2573 ret = send_vhost_message(dev->slave_req_fd, msg);
2574 if (ret < 0 && (msg->flags & VHOST_USER_NEED_REPLY))
2575 rte_spinlock_unlock(&dev->slave_req_lock);
2581 * Allocate a queue pair if it hasn't been allocated yet
2584 vhost_user_check_and_alloc_queue_pair(struct virtio_net *dev,
2585 struct VhostUserMsg *msg)
2589 switch (msg->request.master) {
2590 case VHOST_USER_SET_VRING_KICK:
2591 case VHOST_USER_SET_VRING_CALL:
2592 case VHOST_USER_SET_VRING_ERR:
2593 vring_idx = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
2595 case VHOST_USER_SET_VRING_NUM:
2596 case VHOST_USER_SET_VRING_BASE:
2597 case VHOST_USER_SET_VRING_ENABLE:
2598 vring_idx = msg->payload.state.index;
2600 case VHOST_USER_SET_VRING_ADDR:
2601 vring_idx = msg->payload.addr.index;
2607 if (vring_idx >= VHOST_MAX_VRING) {
2608 VHOST_LOG_CONFIG(ERR,
2609 "invalid vring index: %u\n", vring_idx);
2613 if (dev->virtqueue[vring_idx])
2616 return alloc_vring_queue(dev, vring_idx);
2620 vhost_user_lock_all_queue_pairs(struct virtio_net *dev)
2623 unsigned int vq_num = 0;
2625 while (vq_num < dev->nr_vring) {
2626 struct vhost_virtqueue *vq = dev->virtqueue[i];
2629 rte_spinlock_lock(&vq->access_lock);
2637 vhost_user_unlock_all_queue_pairs(struct virtio_net *dev)
2640 unsigned int vq_num = 0;
2642 while (vq_num < dev->nr_vring) {
2643 struct vhost_virtqueue *vq = dev->virtqueue[i];
2646 rte_spinlock_unlock(&vq->access_lock);
2654 vhost_user_msg_handler(int vid, int fd)
2656 struct virtio_net *dev;
2657 struct VhostUserMsg msg;
2658 struct rte_vdpa_device *vdpa_dev;
2660 int unlock_required = 0;
2665 dev = get_device(vid);
2669 if (!dev->notify_ops) {
2670 dev->notify_ops = vhost_driver_callback_get(dev->ifname);
2671 if (!dev->notify_ops) {
2672 VHOST_LOG_CONFIG(ERR,
2673 "failed to get callback ops for driver %s\n",
2679 ret = read_vhost_message(fd, &msg);
2682 VHOST_LOG_CONFIG(ERR,
2683 "vhost read message failed\n");
2685 VHOST_LOG_CONFIG(INFO,
2686 "vhost peer closed\n");
2692 request = msg.request.master;
2693 if (request > VHOST_USER_NONE && request < VHOST_USER_MAX &&
2694 vhost_message_str[request]) {
2695 if (request != VHOST_USER_IOTLB_MSG)
2696 VHOST_LOG_CONFIG(INFO, "read message %s\n",
2697 vhost_message_str[request]);
2699 VHOST_LOG_CONFIG(DEBUG, "read message %s\n",
2700 vhost_message_str[request]);
2702 VHOST_LOG_CONFIG(DEBUG, "External request %d\n", request);
2705 ret = vhost_user_check_and_alloc_queue_pair(dev, &msg);
2707 VHOST_LOG_CONFIG(ERR,
2708 "failed to alloc queue\n");
2713 * Note: we don't lock all queues on VHOST_USER_GET_VRING_BASE
2714 * and VHOST_USER_RESET_OWNER, since it is sent when virtio stops
2715 * and device is destroyed. destroy_device waits for queues to be
2716 * inactive, so it is safe. Otherwise taking the access_lock
2717 * would cause a dead lock.
2720 case VHOST_USER_SET_FEATURES:
2721 case VHOST_USER_SET_PROTOCOL_FEATURES:
2722 case VHOST_USER_SET_OWNER:
2723 case VHOST_USER_SET_MEM_TABLE:
2724 case VHOST_USER_SET_LOG_BASE:
2725 case VHOST_USER_SET_LOG_FD:
2726 case VHOST_USER_SET_VRING_NUM:
2727 case VHOST_USER_SET_VRING_ADDR:
2728 case VHOST_USER_SET_VRING_BASE:
2729 case VHOST_USER_SET_VRING_KICK:
2730 case VHOST_USER_SET_VRING_CALL:
2731 case VHOST_USER_SET_VRING_ERR:
2732 case VHOST_USER_SET_VRING_ENABLE:
2733 case VHOST_USER_SEND_RARP:
2734 case VHOST_USER_NET_SET_MTU:
2735 case VHOST_USER_SET_SLAVE_REQ_FD:
2736 if (!(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED)) {
2737 vhost_user_lock_all_queue_pairs(dev);
2738 unlock_required = 1;
2747 if (dev->extern_ops.pre_msg_handle) {
2748 ret = (*dev->extern_ops.pre_msg_handle)(dev->vid,
2751 case RTE_VHOST_MSG_RESULT_REPLY:
2752 send_vhost_reply(fd, &msg);
2754 case RTE_VHOST_MSG_RESULT_ERR:
2755 case RTE_VHOST_MSG_RESULT_OK:
2757 goto skip_to_post_handle;
2758 case RTE_VHOST_MSG_RESULT_NOT_HANDLED:
2764 if (request > VHOST_USER_NONE && request < VHOST_USER_MAX) {
2765 if (!vhost_message_handlers[request])
2766 goto skip_to_post_handle;
2767 ret = vhost_message_handlers[request](&dev, &msg, fd);
2770 case RTE_VHOST_MSG_RESULT_ERR:
2771 VHOST_LOG_CONFIG(ERR,
2772 "Processing %s failed.\n",
2773 vhost_message_str[request]);
2776 case RTE_VHOST_MSG_RESULT_OK:
2777 VHOST_LOG_CONFIG(DEBUG,
2778 "Processing %s succeeded.\n",
2779 vhost_message_str[request]);
2782 case RTE_VHOST_MSG_RESULT_REPLY:
2783 VHOST_LOG_CONFIG(DEBUG,
2784 "Processing %s succeeded and needs reply.\n",
2785 vhost_message_str[request]);
2786 send_vhost_reply(fd, &msg);
2794 skip_to_post_handle:
2795 if (ret != RTE_VHOST_MSG_RESULT_ERR &&
2796 dev->extern_ops.post_msg_handle) {
2797 ret = (*dev->extern_ops.post_msg_handle)(dev->vid,
2800 case RTE_VHOST_MSG_RESULT_REPLY:
2801 send_vhost_reply(fd, &msg);
2803 case RTE_VHOST_MSG_RESULT_ERR:
2804 case RTE_VHOST_MSG_RESULT_OK:
2806 case RTE_VHOST_MSG_RESULT_NOT_HANDLED:
2812 if (unlock_required)
2813 vhost_user_unlock_all_queue_pairs(dev);
2815 /* If message was not handled at this stage, treat it as an error */
2817 VHOST_LOG_CONFIG(ERR,
2818 "vhost message (req: %d) was not handled.\n", request);
2819 close_msg_fds(&msg);
2820 ret = RTE_VHOST_MSG_RESULT_ERR;
2824 * If the request required a reply that was already sent,
2825 * this optional reply-ack won't be sent as the
2826 * VHOST_USER_NEED_REPLY was cleared in send_vhost_reply().
2828 if (msg.flags & VHOST_USER_NEED_REPLY) {
2829 msg.payload.u64 = ret == RTE_VHOST_MSG_RESULT_ERR;
2830 msg.size = sizeof(msg.payload.u64);
2832 send_vhost_reply(fd, &msg);
2833 } else if (ret == RTE_VHOST_MSG_RESULT_ERR) {
2834 VHOST_LOG_CONFIG(ERR,
2835 "vhost message handling failed.\n");
2839 for (i = 0; i < dev->nr_vring; i++) {
2840 struct vhost_virtqueue *vq = dev->virtqueue[i];
2841 bool cur_ready = vq_is_ready(dev, vq);
2843 if (cur_ready != (vq && vq->ready)) {
2844 vhost_user_notify_queue_state(dev, i, cur_ready);
2845 vq->ready = cur_ready;
2850 if (!virtio_is_ready(dev))
2854 * Virtio is now ready. If not done already, it is time
2855 * to notify the application it can process the rings and
2856 * configure the vDPA device if present.
2859 if (!(dev->flags & VIRTIO_DEV_RUNNING)) {
2860 if (dev->notify_ops->new_device(dev->vid) == 0)
2861 dev->flags |= VIRTIO_DEV_RUNNING;
2864 vdpa_dev = dev->vdpa_dev;
2868 if (!(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED)) {
2869 vdpa_dev->ops->dev_conf(dev->vid);
2870 dev->flags |= VIRTIO_DEV_VDPA_CONFIGURED;
2877 static int process_slave_message_reply(struct virtio_net *dev,
2878 const struct VhostUserMsg *msg)
2880 struct VhostUserMsg msg_reply;
2883 if ((msg->flags & VHOST_USER_NEED_REPLY) == 0)
2886 ret = read_vhost_message(dev->slave_req_fd, &msg_reply);
2889 VHOST_LOG_CONFIG(ERR,
2890 "vhost read slave message reply failed\n");
2892 VHOST_LOG_CONFIG(INFO,
2893 "vhost peer closed\n");
2899 if (msg_reply.request.slave != msg->request.slave) {
2900 VHOST_LOG_CONFIG(ERR,
2901 "Received unexpected msg type (%u), expected %u\n",
2902 msg_reply.request.slave, msg->request.slave);
2907 ret = msg_reply.payload.u64 ? -1 : 0;
2910 rte_spinlock_unlock(&dev->slave_req_lock);
2915 vhost_user_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm)
2918 struct VhostUserMsg msg = {
2919 .request.slave = VHOST_USER_SLAVE_IOTLB_MSG,
2920 .flags = VHOST_USER_VERSION,
2921 .size = sizeof(msg.payload.iotlb),
2925 .type = VHOST_IOTLB_MISS,
2929 ret = send_vhost_message(dev->slave_req_fd, &msg);
2931 VHOST_LOG_CONFIG(ERR,
2932 "Failed to send IOTLB miss message (%d)\n",
2941 vhost_user_slave_config_change(struct virtio_net *dev, bool need_reply)
2944 struct VhostUserMsg msg = {
2945 .request.slave = VHOST_USER_SLAVE_CONFIG_CHANGE_MSG,
2946 .flags = VHOST_USER_VERSION,
2951 msg.flags |= VHOST_USER_NEED_REPLY;
2953 ret = send_vhost_slave_message(dev, &msg);
2955 VHOST_LOG_CONFIG(ERR,
2956 "Failed to send config change (%d)\n",
2961 return process_slave_message_reply(dev, &msg);
2965 rte_vhost_slave_config_change(int vid, bool need_reply)
2967 struct virtio_net *dev;
2969 dev = get_device(vid);
2973 return vhost_user_slave_config_change(dev, need_reply);
2976 static int vhost_user_slave_set_vring_host_notifier(struct virtio_net *dev,
2982 struct VhostUserMsg msg = {
2983 .request.slave = VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG,
2984 .flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY,
2985 .size = sizeof(msg.payload.area),
2987 .u64 = index & VHOST_USER_VRING_IDX_MASK,
2994 msg.payload.area.u64 |= VHOST_USER_VRING_NOFD_MASK;
3000 ret = send_vhost_slave_message(dev, &msg);
3002 VHOST_LOG_CONFIG(ERR,
3003 "Failed to set host notifier (%d)\n", ret);
3007 return process_slave_message_reply(dev, &msg);
3010 int rte_vhost_host_notifier_ctrl(int vid, uint16_t qid, bool enable)
3012 struct virtio_net *dev;
3013 struct rte_vdpa_device *vdpa_dev;
3014 int vfio_device_fd, ret = 0;
3015 uint64_t offset, size;
3016 unsigned int i, q_start, q_last;
3018 dev = get_device(vid);
3022 vdpa_dev = dev->vdpa_dev;
3023 if (vdpa_dev == NULL)
3026 if (!(dev->features & (1ULL << VIRTIO_F_VERSION_1)) ||
3027 !(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES)) ||
3028 !(dev->protocol_features &
3029 (1ULL << VHOST_USER_PROTOCOL_F_SLAVE_REQ)) ||
3030 !(dev->protocol_features &
3031 (1ULL << VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD)) ||
3032 !(dev->protocol_features &
3033 (1ULL << VHOST_USER_PROTOCOL_F_HOST_NOTIFIER)))
3036 if (qid == RTE_VHOST_QUEUE_ALL) {
3038 q_last = dev->nr_vring - 1;
3040 if (qid >= dev->nr_vring)
3046 RTE_FUNC_PTR_OR_ERR_RET(vdpa_dev->ops->get_vfio_device_fd, -ENOTSUP);
3047 RTE_FUNC_PTR_OR_ERR_RET(vdpa_dev->ops->get_notify_area, -ENOTSUP);
3049 vfio_device_fd = vdpa_dev->ops->get_vfio_device_fd(vid);
3050 if (vfio_device_fd < 0)
3054 for (i = q_start; i <= q_last; i++) {
3055 if (vdpa_dev->ops->get_notify_area(vid, i, &offset,
3061 if (vhost_user_slave_set_vring_host_notifier(dev, i,
3062 vfio_device_fd, offset, size) < 0) {
3069 for (i = q_start; i <= q_last; i++) {
3070 vhost_user_slave_set_vring_host_notifier(dev, i, -1,