17a338472SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2433fc58eSAsias He /* 3433fc58eSAsias He * vhost transport for vsock 4433fc58eSAsias He * 5433fc58eSAsias He * Copyright (C) 2013-2015 Red Hat, Inc. 6433fc58eSAsias He * Author: Asias He <asias@redhat.com> 7433fc58eSAsias He * Stefan Hajnoczi <stefanha@redhat.com> 8433fc58eSAsias He */ 9433fc58eSAsias He #include <linux/miscdevice.h> 10433fc58eSAsias He #include <linux/atomic.h> 11433fc58eSAsias He #include <linux/module.h> 12433fc58eSAsias He #include <linux/mutex.h> 13433fc58eSAsias He #include <linux/vmalloc.h> 14433fc58eSAsias He #include <net/sock.h> 15433fc58eSAsias He #include <linux/virtio_vsock.h> 16433fc58eSAsias He #include <linux/vhost.h> 17834e772cSStefan Hajnoczi #include <linux/hashtable.h> 18433fc58eSAsias He 19433fc58eSAsias He #include <net/af_vsock.h> 20433fc58eSAsias He #include "vhost.h" 21433fc58eSAsias He 22433fc58eSAsias He #define VHOST_VSOCK_DEFAULT_HOST_CID 2 23e82b9b07SJason Wang /* Max number of bytes transferred before requeueing the job. 24e82b9b07SJason Wang * Using this limit prevents one virtqueue from starving others. */ 25e82b9b07SJason Wang #define VHOST_VSOCK_WEIGHT 0x80000 26e82b9b07SJason Wang /* Max number of packets transferred before requeueing the job. 27e82b9b07SJason Wang * Using this limit prevents one virtqueue from starving others with 28e82b9b07SJason Wang * small pkts. 29e82b9b07SJason Wang */ 30e82b9b07SJason Wang #define VHOST_VSOCK_PKT_WEIGHT 256 31433fc58eSAsias He 32433fc58eSAsias He enum { 33433fc58eSAsias He VHOST_VSOCK_FEATURES = VHOST_FEATURES, 34433fc58eSAsias He }; 35433fc58eSAsias He 36433fc58eSAsias He /* Used to track all the vhost_vsock instances on the system. */ 376db3d8dcSStefan Hajnoczi static DEFINE_MUTEX(vhost_vsock_mutex); 38834e772cSStefan Hajnoczi static DEFINE_READ_MOSTLY_HASHTABLE(vhost_vsock_hash, 8); 39433fc58eSAsias He 40433fc58eSAsias He struct vhost_vsock { 41433fc58eSAsias He struct vhost_dev dev; 42433fc58eSAsias He struct vhost_virtqueue vqs[2]; 43433fc58eSAsias He 446db3d8dcSStefan Hajnoczi /* Link to global vhost_vsock_hash, writes use vhost_vsock_mutex */ 45834e772cSStefan Hajnoczi struct hlist_node hash; 46433fc58eSAsias He 47433fc58eSAsias He struct vhost_work send_pkt_work; 48433fc58eSAsias He spinlock_t send_pkt_list_lock; 49433fc58eSAsias He struct list_head send_pkt_list; /* host->guest pending packets */ 50433fc58eSAsias He 51433fc58eSAsias He atomic_t queued_replies; 52433fc58eSAsias He 53433fc58eSAsias He u32 guest_cid; 54433fc58eSAsias He }; 55433fc58eSAsias He 56433fc58eSAsias He static u32 vhost_transport_get_local_cid(void) 57433fc58eSAsias He { 58433fc58eSAsias He return VHOST_VSOCK_DEFAULT_HOST_CID; 59433fc58eSAsias He } 60433fc58eSAsias He 616db3d8dcSStefan Hajnoczi /* Callers that dereference the return value must hold vhost_vsock_mutex or the 62834e772cSStefan Hajnoczi * RCU read lock. 63834e772cSStefan Hajnoczi */ 64834e772cSStefan Hajnoczi static struct vhost_vsock *vhost_vsock_get(u32 guest_cid) 65433fc58eSAsias He { 66433fc58eSAsias He struct vhost_vsock *vsock; 67433fc58eSAsias He 68834e772cSStefan Hajnoczi hash_for_each_possible_rcu(vhost_vsock_hash, vsock, hash, guest_cid) { 69433fc58eSAsias He u32 other_cid = vsock->guest_cid; 70433fc58eSAsias He 71433fc58eSAsias He /* Skip instances that have no CID yet */ 72433fc58eSAsias He if (other_cid == 0) 73433fc58eSAsias He continue; 74433fc58eSAsias He 75ff3c1b1aSVaibhav Murkute if (other_cid == guest_cid) 76433fc58eSAsias He return vsock; 77ff3c1b1aSVaibhav Murkute 78433fc58eSAsias He } 79433fc58eSAsias He 80433fc58eSAsias He return NULL; 81433fc58eSAsias He } 82433fc58eSAsias He 83433fc58eSAsias He static void 84433fc58eSAsias He vhost_transport_do_send_pkt(struct vhost_vsock *vsock, 85433fc58eSAsias He struct vhost_virtqueue *vq) 86433fc58eSAsias He { 87433fc58eSAsias He struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX]; 88e79b431fSJason Wang int pkts = 0, total_len = 0; 89433fc58eSAsias He bool added = false; 90433fc58eSAsias He bool restart_tx = false; 91433fc58eSAsias He 92433fc58eSAsias He mutex_lock(&vq->mutex); 93433fc58eSAsias He 94433fc58eSAsias He if (!vq->private_data) 95433fc58eSAsias He goto out; 96433fc58eSAsias He 97433fc58eSAsias He /* Avoid further vmexits, we're already processing the virtqueue */ 98433fc58eSAsias He vhost_disable_notify(&vsock->dev, vq); 99433fc58eSAsias He 100e79b431fSJason Wang do { 101433fc58eSAsias He struct virtio_vsock_pkt *pkt; 102433fc58eSAsias He struct iov_iter iov_iter; 103433fc58eSAsias He unsigned out, in; 104433fc58eSAsias He size_t nbytes; 1056dbd3e66SStefano Garzarella size_t iov_len, payload_len; 106433fc58eSAsias He int head; 107433fc58eSAsias He 108433fc58eSAsias He spin_lock_bh(&vsock->send_pkt_list_lock); 109433fc58eSAsias He if (list_empty(&vsock->send_pkt_list)) { 110433fc58eSAsias He spin_unlock_bh(&vsock->send_pkt_list_lock); 111433fc58eSAsias He vhost_enable_notify(&vsock->dev, vq); 112433fc58eSAsias He break; 113433fc58eSAsias He } 114433fc58eSAsias He 115433fc58eSAsias He pkt = list_first_entry(&vsock->send_pkt_list, 116433fc58eSAsias He struct virtio_vsock_pkt, list); 117433fc58eSAsias He list_del_init(&pkt->list); 118433fc58eSAsias He spin_unlock_bh(&vsock->send_pkt_list_lock); 119433fc58eSAsias He 120433fc58eSAsias He head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), 121433fc58eSAsias He &out, &in, NULL, NULL); 122433fc58eSAsias He if (head < 0) { 123433fc58eSAsias He spin_lock_bh(&vsock->send_pkt_list_lock); 124433fc58eSAsias He list_add(&pkt->list, &vsock->send_pkt_list); 125433fc58eSAsias He spin_unlock_bh(&vsock->send_pkt_list_lock); 126433fc58eSAsias He break; 127433fc58eSAsias He } 128433fc58eSAsias He 129433fc58eSAsias He if (head == vq->num) { 130433fc58eSAsias He spin_lock_bh(&vsock->send_pkt_list_lock); 131433fc58eSAsias He list_add(&pkt->list, &vsock->send_pkt_list); 132433fc58eSAsias He spin_unlock_bh(&vsock->send_pkt_list_lock); 133433fc58eSAsias He 134433fc58eSAsias He /* We cannot finish yet if more buffers snuck in while 135433fc58eSAsias He * re-enabling notify. 136433fc58eSAsias He */ 137433fc58eSAsias He if (unlikely(vhost_enable_notify(&vsock->dev, vq))) { 138433fc58eSAsias He vhost_disable_notify(&vsock->dev, vq); 139433fc58eSAsias He continue; 140433fc58eSAsias He } 141433fc58eSAsias He break; 142433fc58eSAsias He } 143433fc58eSAsias He 144433fc58eSAsias He if (out) { 145433fc58eSAsias He virtio_transport_free_pkt(pkt); 146433fc58eSAsias He vq_err(vq, "Expected 0 output buffers, got %u\n", out); 147433fc58eSAsias He break; 148433fc58eSAsias He } 149433fc58eSAsias He 1506dbd3e66SStefano Garzarella iov_len = iov_length(&vq->iov[out], in); 1516dbd3e66SStefano Garzarella if (iov_len < sizeof(pkt->hdr)) { 1526dbd3e66SStefano Garzarella virtio_transport_free_pkt(pkt); 1536dbd3e66SStefano Garzarella vq_err(vq, "Buffer len [%zu] too small\n", iov_len); 1546dbd3e66SStefano Garzarella break; 1556dbd3e66SStefano Garzarella } 1566dbd3e66SStefano Garzarella 1576dbd3e66SStefano Garzarella iov_iter_init(&iov_iter, READ, &vq->iov[out], in, iov_len); 1586dbd3e66SStefano Garzarella payload_len = pkt->len - pkt->off; 1596dbd3e66SStefano Garzarella 1606dbd3e66SStefano Garzarella /* If the packet is greater than the space available in the 1616dbd3e66SStefano Garzarella * buffer, we split it using multiple buffers. 1626dbd3e66SStefano Garzarella */ 1636dbd3e66SStefano Garzarella if (payload_len > iov_len - sizeof(pkt->hdr)) 1646dbd3e66SStefano Garzarella payload_len = iov_len - sizeof(pkt->hdr); 1656dbd3e66SStefano Garzarella 1666dbd3e66SStefano Garzarella /* Set the correct length in the header */ 1676dbd3e66SStefano Garzarella pkt->hdr.len = cpu_to_le32(payload_len); 168433fc58eSAsias He 169433fc58eSAsias He nbytes = copy_to_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter); 170433fc58eSAsias He if (nbytes != sizeof(pkt->hdr)) { 171433fc58eSAsias He virtio_transport_free_pkt(pkt); 172433fc58eSAsias He vq_err(vq, "Faulted on copying pkt hdr\n"); 173433fc58eSAsias He break; 174433fc58eSAsias He } 175433fc58eSAsias He 1766dbd3e66SStefano Garzarella nbytes = copy_to_iter(pkt->buf + pkt->off, payload_len, 1776dbd3e66SStefano Garzarella &iov_iter); 1786dbd3e66SStefano Garzarella if (nbytes != payload_len) { 179433fc58eSAsias He virtio_transport_free_pkt(pkt); 180433fc58eSAsias He vq_err(vq, "Faulted on copying pkt buf\n"); 181433fc58eSAsias He break; 182433fc58eSAsias He } 183433fc58eSAsias He 1846dbd3e66SStefano Garzarella vhost_add_used(vq, head, sizeof(pkt->hdr) + payload_len); 185433fc58eSAsias He added = true; 186433fc58eSAsias He 18782dfb540SGerard Garcia /* Deliver to monitoring devices all correctly transmitted 18882dfb540SGerard Garcia * packets. 18982dfb540SGerard Garcia */ 19082dfb540SGerard Garcia virtio_transport_deliver_tap_pkt(pkt); 19182dfb540SGerard Garcia 1926dbd3e66SStefano Garzarella pkt->off += payload_len; 1936dbd3e66SStefano Garzarella total_len += payload_len; 1946dbd3e66SStefano Garzarella 1956dbd3e66SStefano Garzarella /* If we didn't send all the payload we can requeue the packet 1966dbd3e66SStefano Garzarella * to send it with the next available buffer. 1976dbd3e66SStefano Garzarella */ 1986dbd3e66SStefano Garzarella if (pkt->off < pkt->len) { 1996dbd3e66SStefano Garzarella spin_lock_bh(&vsock->send_pkt_list_lock); 2006dbd3e66SStefano Garzarella list_add(&pkt->list, &vsock->send_pkt_list); 2016dbd3e66SStefano Garzarella spin_unlock_bh(&vsock->send_pkt_list_lock); 2026dbd3e66SStefano Garzarella } else { 2036dbd3e66SStefano Garzarella if (pkt->reply) { 2046dbd3e66SStefano Garzarella int val; 2056dbd3e66SStefano Garzarella 2066dbd3e66SStefano Garzarella val = atomic_dec_return(&vsock->queued_replies); 2076dbd3e66SStefano Garzarella 2086dbd3e66SStefano Garzarella /* Do we have resources to resume tx 2096dbd3e66SStefano Garzarella * processing? 2106dbd3e66SStefano Garzarella */ 2116dbd3e66SStefano Garzarella if (val + 1 == tx_vq->num) 2126dbd3e66SStefano Garzarella restart_tx = true; 2136dbd3e66SStefano Garzarella } 2146dbd3e66SStefano Garzarella 215433fc58eSAsias He virtio_transport_free_pkt(pkt); 2166dbd3e66SStefano Garzarella } 217e79b431fSJason Wang } while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len))); 218433fc58eSAsias He if (added) 219433fc58eSAsias He vhost_signal(&vsock->dev, vq); 220433fc58eSAsias He 221433fc58eSAsias He out: 222433fc58eSAsias He mutex_unlock(&vq->mutex); 223433fc58eSAsias He 224433fc58eSAsias He if (restart_tx) 225433fc58eSAsias He vhost_poll_queue(&tx_vq->poll); 226433fc58eSAsias He } 227433fc58eSAsias He 228433fc58eSAsias He static void vhost_transport_send_pkt_work(struct vhost_work *work) 229433fc58eSAsias He { 230433fc58eSAsias He struct vhost_virtqueue *vq; 231433fc58eSAsias He struct vhost_vsock *vsock; 232433fc58eSAsias He 233433fc58eSAsias He vsock = container_of(work, struct vhost_vsock, send_pkt_work); 234433fc58eSAsias He vq = &vsock->vqs[VSOCK_VQ_RX]; 235433fc58eSAsias He 236433fc58eSAsias He vhost_transport_do_send_pkt(vsock, vq); 237433fc58eSAsias He } 238433fc58eSAsias He 239433fc58eSAsias He static int 240433fc58eSAsias He vhost_transport_send_pkt(struct virtio_vsock_pkt *pkt) 241433fc58eSAsias He { 242433fc58eSAsias He struct vhost_vsock *vsock; 243433fc58eSAsias He int len = pkt->len; 244433fc58eSAsias He 245834e772cSStefan Hajnoczi rcu_read_lock(); 246834e772cSStefan Hajnoczi 247433fc58eSAsias He /* Find the vhost_vsock according to guest context id */ 248433fc58eSAsias He vsock = vhost_vsock_get(le64_to_cpu(pkt->hdr.dst_cid)); 249433fc58eSAsias He if (!vsock) { 250834e772cSStefan Hajnoczi rcu_read_unlock(); 251433fc58eSAsias He virtio_transport_free_pkt(pkt); 252433fc58eSAsias He return -ENODEV; 253433fc58eSAsias He } 254433fc58eSAsias He 255433fc58eSAsias He if (pkt->reply) 256433fc58eSAsias He atomic_inc(&vsock->queued_replies); 257433fc58eSAsias He 258433fc58eSAsias He spin_lock_bh(&vsock->send_pkt_list_lock); 259433fc58eSAsias He list_add_tail(&pkt->list, &vsock->send_pkt_list); 260433fc58eSAsias He spin_unlock_bh(&vsock->send_pkt_list_lock); 261433fc58eSAsias He 262433fc58eSAsias He vhost_work_queue(&vsock->dev, &vsock->send_pkt_work); 263834e772cSStefan Hajnoczi 264834e772cSStefan Hajnoczi rcu_read_unlock(); 265433fc58eSAsias He return len; 266433fc58eSAsias He } 267433fc58eSAsias He 26816320f36SPeng Tao static int 26916320f36SPeng Tao vhost_transport_cancel_pkt(struct vsock_sock *vsk) 27016320f36SPeng Tao { 27116320f36SPeng Tao struct vhost_vsock *vsock; 27216320f36SPeng Tao struct virtio_vsock_pkt *pkt, *n; 27316320f36SPeng Tao int cnt = 0; 274834e772cSStefan Hajnoczi int ret = -ENODEV; 27516320f36SPeng Tao LIST_HEAD(freeme); 27616320f36SPeng Tao 277834e772cSStefan Hajnoczi rcu_read_lock(); 278834e772cSStefan Hajnoczi 27916320f36SPeng Tao /* Find the vhost_vsock according to guest context id */ 28016320f36SPeng Tao vsock = vhost_vsock_get(vsk->remote_addr.svm_cid); 28116320f36SPeng Tao if (!vsock) 282834e772cSStefan Hajnoczi goto out; 28316320f36SPeng Tao 28416320f36SPeng Tao spin_lock_bh(&vsock->send_pkt_list_lock); 28516320f36SPeng Tao list_for_each_entry_safe(pkt, n, &vsock->send_pkt_list, list) { 28616320f36SPeng Tao if (pkt->vsk != vsk) 28716320f36SPeng Tao continue; 28816320f36SPeng Tao list_move(&pkt->list, &freeme); 28916320f36SPeng Tao } 29016320f36SPeng Tao spin_unlock_bh(&vsock->send_pkt_list_lock); 29116320f36SPeng Tao 29216320f36SPeng Tao list_for_each_entry_safe(pkt, n, &freeme, list) { 29316320f36SPeng Tao if (pkt->reply) 29416320f36SPeng Tao cnt++; 29516320f36SPeng Tao list_del(&pkt->list); 29616320f36SPeng Tao virtio_transport_free_pkt(pkt); 29716320f36SPeng Tao } 29816320f36SPeng Tao 29916320f36SPeng Tao if (cnt) { 30016320f36SPeng Tao struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX]; 30116320f36SPeng Tao int new_cnt; 30216320f36SPeng Tao 30316320f36SPeng Tao new_cnt = atomic_sub_return(cnt, &vsock->queued_replies); 30416320f36SPeng Tao if (new_cnt + cnt >= tx_vq->num && new_cnt < tx_vq->num) 30516320f36SPeng Tao vhost_poll_queue(&tx_vq->poll); 30616320f36SPeng Tao } 30716320f36SPeng Tao 308834e772cSStefan Hajnoczi ret = 0; 309834e772cSStefan Hajnoczi out: 310834e772cSStefan Hajnoczi rcu_read_unlock(); 311834e772cSStefan Hajnoczi return ret; 31216320f36SPeng Tao } 31316320f36SPeng Tao 314433fc58eSAsias He static struct virtio_vsock_pkt * 315433fc58eSAsias He vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq, 316433fc58eSAsias He unsigned int out, unsigned int in) 317433fc58eSAsias He { 318433fc58eSAsias He struct virtio_vsock_pkt *pkt; 319433fc58eSAsias He struct iov_iter iov_iter; 320433fc58eSAsias He size_t nbytes; 321433fc58eSAsias He size_t len; 322433fc58eSAsias He 323433fc58eSAsias He if (in != 0) { 324433fc58eSAsias He vq_err(vq, "Expected 0 input buffers, got %u\n", in); 325433fc58eSAsias He return NULL; 326433fc58eSAsias He } 327433fc58eSAsias He 328433fc58eSAsias He pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); 329433fc58eSAsias He if (!pkt) 330433fc58eSAsias He return NULL; 331433fc58eSAsias He 332433fc58eSAsias He len = iov_length(vq->iov, out); 333433fc58eSAsias He iov_iter_init(&iov_iter, WRITE, vq->iov, out, len); 334433fc58eSAsias He 335433fc58eSAsias He nbytes = copy_from_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter); 336433fc58eSAsias He if (nbytes != sizeof(pkt->hdr)) { 337433fc58eSAsias He vq_err(vq, "Expected %zu bytes for pkt->hdr, got %zu bytes\n", 338433fc58eSAsias He sizeof(pkt->hdr), nbytes); 339433fc58eSAsias He kfree(pkt); 340433fc58eSAsias He return NULL; 341433fc58eSAsias He } 342433fc58eSAsias He 343433fc58eSAsias He if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_STREAM) 344433fc58eSAsias He pkt->len = le32_to_cpu(pkt->hdr.len); 345433fc58eSAsias He 346433fc58eSAsias He /* No payload */ 347433fc58eSAsias He if (!pkt->len) 348433fc58eSAsias He return pkt; 349433fc58eSAsias He 350433fc58eSAsias He /* The pkt is too big */ 351433fc58eSAsias He if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) { 352433fc58eSAsias He kfree(pkt); 353433fc58eSAsias He return NULL; 354433fc58eSAsias He } 355433fc58eSAsias He 356433fc58eSAsias He pkt->buf = kmalloc(pkt->len, GFP_KERNEL); 357433fc58eSAsias He if (!pkt->buf) { 358433fc58eSAsias He kfree(pkt); 359433fc58eSAsias He return NULL; 360433fc58eSAsias He } 361433fc58eSAsias He 362473c7391SStefano Garzarella pkt->buf_len = pkt->len; 363473c7391SStefano Garzarella 364433fc58eSAsias He nbytes = copy_from_iter(pkt->buf, pkt->len, &iov_iter); 365433fc58eSAsias He if (nbytes != pkt->len) { 366433fc58eSAsias He vq_err(vq, "Expected %u byte payload, got %zu bytes\n", 367433fc58eSAsias He pkt->len, nbytes); 368433fc58eSAsias He virtio_transport_free_pkt(pkt); 369433fc58eSAsias He return NULL; 370433fc58eSAsias He } 371433fc58eSAsias He 372433fc58eSAsias He return pkt; 373433fc58eSAsias He } 374433fc58eSAsias He 375433fc58eSAsias He /* Is there space left for replies to rx packets? */ 376433fc58eSAsias He static bool vhost_vsock_more_replies(struct vhost_vsock *vsock) 377433fc58eSAsias He { 378433fc58eSAsias He struct vhost_virtqueue *vq = &vsock->vqs[VSOCK_VQ_TX]; 379433fc58eSAsias He int val; 380433fc58eSAsias He 381433fc58eSAsias He smp_rmb(); /* paired with atomic_inc() and atomic_dec_return() */ 382433fc58eSAsias He val = atomic_read(&vsock->queued_replies); 383433fc58eSAsias He 384433fc58eSAsias He return val < vq->num; 385433fc58eSAsias He } 386433fc58eSAsias He 3874c7246dcSStefano Garzarella static struct virtio_transport vhost_transport = { 3884c7246dcSStefano Garzarella .transport = { 3896a2c0962SStefano Garzarella .module = THIS_MODULE, 3906a2c0962SStefano Garzarella 3914c7246dcSStefano Garzarella .get_local_cid = vhost_transport_get_local_cid, 3924c7246dcSStefano Garzarella 3934c7246dcSStefano Garzarella .init = virtio_transport_do_socket_init, 3944c7246dcSStefano Garzarella .destruct = virtio_transport_destruct, 3954c7246dcSStefano Garzarella .release = virtio_transport_release, 3964c7246dcSStefano Garzarella .connect = virtio_transport_connect, 3974c7246dcSStefano Garzarella .shutdown = virtio_transport_shutdown, 3984c7246dcSStefano Garzarella .cancel_pkt = vhost_transport_cancel_pkt, 3994c7246dcSStefano Garzarella 4004c7246dcSStefano Garzarella .dgram_enqueue = virtio_transport_dgram_enqueue, 4014c7246dcSStefano Garzarella .dgram_dequeue = virtio_transport_dgram_dequeue, 4024c7246dcSStefano Garzarella .dgram_bind = virtio_transport_dgram_bind, 4034c7246dcSStefano Garzarella .dgram_allow = virtio_transport_dgram_allow, 4044c7246dcSStefano Garzarella 4054c7246dcSStefano Garzarella .stream_enqueue = virtio_transport_stream_enqueue, 4064c7246dcSStefano Garzarella .stream_dequeue = virtio_transport_stream_dequeue, 4074c7246dcSStefano Garzarella .stream_has_data = virtio_transport_stream_has_data, 4084c7246dcSStefano Garzarella .stream_has_space = virtio_transport_stream_has_space, 4094c7246dcSStefano Garzarella .stream_rcvhiwat = virtio_transport_stream_rcvhiwat, 4104c7246dcSStefano Garzarella .stream_is_active = virtio_transport_stream_is_active, 4114c7246dcSStefano Garzarella .stream_allow = virtio_transport_stream_allow, 4124c7246dcSStefano Garzarella 4134c7246dcSStefano Garzarella .notify_poll_in = virtio_transport_notify_poll_in, 4144c7246dcSStefano Garzarella .notify_poll_out = virtio_transport_notify_poll_out, 4154c7246dcSStefano Garzarella .notify_recv_init = virtio_transport_notify_recv_init, 4164c7246dcSStefano Garzarella .notify_recv_pre_block = virtio_transport_notify_recv_pre_block, 4174c7246dcSStefano Garzarella .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue, 4184c7246dcSStefano Garzarella .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue, 4194c7246dcSStefano Garzarella .notify_send_init = virtio_transport_notify_send_init, 4204c7246dcSStefano Garzarella .notify_send_pre_block = virtio_transport_notify_send_pre_block, 4214c7246dcSStefano Garzarella .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue, 4224c7246dcSStefano Garzarella .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue, 423b9f2b0ffSStefano Garzarella .notify_buffer_size = virtio_transport_notify_buffer_size, 4244c7246dcSStefano Garzarella 4254c7246dcSStefano Garzarella }, 4264c7246dcSStefano Garzarella 4274c7246dcSStefano Garzarella .send_pkt = vhost_transport_send_pkt, 4284c7246dcSStefano Garzarella }; 4294c7246dcSStefano Garzarella 430433fc58eSAsias He static void vhost_vsock_handle_tx_kick(struct vhost_work *work) 431433fc58eSAsias He { 432433fc58eSAsias He struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, 433433fc58eSAsias He poll.work); 434433fc58eSAsias He struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, 435433fc58eSAsias He dev); 436433fc58eSAsias He struct virtio_vsock_pkt *pkt; 437e79b431fSJason Wang int head, pkts = 0, total_len = 0; 438433fc58eSAsias He unsigned int out, in; 439433fc58eSAsias He bool added = false; 440433fc58eSAsias He 441433fc58eSAsias He mutex_lock(&vq->mutex); 442433fc58eSAsias He 443433fc58eSAsias He if (!vq->private_data) 444433fc58eSAsias He goto out; 445433fc58eSAsias He 446433fc58eSAsias He vhost_disable_notify(&vsock->dev, vq); 447e79b431fSJason Wang do { 4483fda5d6eSStefan Hajnoczi u32 len; 4493fda5d6eSStefan Hajnoczi 450433fc58eSAsias He if (!vhost_vsock_more_replies(vsock)) { 451433fc58eSAsias He /* Stop tx until the device processes already 452433fc58eSAsias He * pending replies. Leave tx virtqueue 453433fc58eSAsias He * callbacks disabled. 454433fc58eSAsias He */ 455433fc58eSAsias He goto no_more_replies; 456433fc58eSAsias He } 457433fc58eSAsias He 458433fc58eSAsias He head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), 459433fc58eSAsias He &out, &in, NULL, NULL); 460433fc58eSAsias He if (head < 0) 461433fc58eSAsias He break; 462433fc58eSAsias He 463433fc58eSAsias He if (head == vq->num) { 464433fc58eSAsias He if (unlikely(vhost_enable_notify(&vsock->dev, vq))) { 465433fc58eSAsias He vhost_disable_notify(&vsock->dev, vq); 466433fc58eSAsias He continue; 467433fc58eSAsias He } 468433fc58eSAsias He break; 469433fc58eSAsias He } 470433fc58eSAsias He 471433fc58eSAsias He pkt = vhost_vsock_alloc_pkt(vq, out, in); 472433fc58eSAsias He if (!pkt) { 473433fc58eSAsias He vq_err(vq, "Faulted on pkt\n"); 474433fc58eSAsias He continue; 475433fc58eSAsias He } 476433fc58eSAsias He 4773fda5d6eSStefan Hajnoczi len = pkt->len; 4783fda5d6eSStefan Hajnoczi 47982dfb540SGerard Garcia /* Deliver to monitoring devices all received packets */ 48082dfb540SGerard Garcia virtio_transport_deliver_tap_pkt(pkt); 48182dfb540SGerard Garcia 482433fc58eSAsias He /* Only accept correctly addressed packets */ 483*8a3cc29cSStefano Garzarella if (le64_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid && 484*8a3cc29cSStefano Garzarella le64_to_cpu(pkt->hdr.dst_cid) == 485*8a3cc29cSStefano Garzarella vhost_transport_get_local_cid()) 4864c7246dcSStefano Garzarella virtio_transport_recv_pkt(&vhost_transport, pkt); 487433fc58eSAsias He else 488433fc58eSAsias He virtio_transport_free_pkt(pkt); 489433fc58eSAsias He 490e79b431fSJason Wang len += sizeof(pkt->hdr); 491e79b431fSJason Wang vhost_add_used(vq, head, len); 492e79b431fSJason Wang total_len += len; 493433fc58eSAsias He added = true; 494e79b431fSJason Wang } while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len))); 495433fc58eSAsias He 496433fc58eSAsias He no_more_replies: 497433fc58eSAsias He if (added) 498433fc58eSAsias He vhost_signal(&vsock->dev, vq); 499433fc58eSAsias He 500433fc58eSAsias He out: 501433fc58eSAsias He mutex_unlock(&vq->mutex); 502433fc58eSAsias He } 503433fc58eSAsias He 504433fc58eSAsias He static void vhost_vsock_handle_rx_kick(struct vhost_work *work) 505433fc58eSAsias He { 506433fc58eSAsias He struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, 507433fc58eSAsias He poll.work); 508433fc58eSAsias He struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, 509433fc58eSAsias He dev); 510433fc58eSAsias He 511433fc58eSAsias He vhost_transport_do_send_pkt(vsock, vq); 512433fc58eSAsias He } 513433fc58eSAsias He 514433fc58eSAsias He static int vhost_vsock_start(struct vhost_vsock *vsock) 515433fc58eSAsias He { 5160516ffd8SStefan Hajnoczi struct vhost_virtqueue *vq; 517433fc58eSAsias He size_t i; 518433fc58eSAsias He int ret; 519433fc58eSAsias He 520433fc58eSAsias He mutex_lock(&vsock->dev.mutex); 521433fc58eSAsias He 522433fc58eSAsias He ret = vhost_dev_check_owner(&vsock->dev); 523433fc58eSAsias He if (ret) 524433fc58eSAsias He goto err; 525433fc58eSAsias He 526433fc58eSAsias He for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 5270516ffd8SStefan Hajnoczi vq = &vsock->vqs[i]; 528433fc58eSAsias He 529433fc58eSAsias He mutex_lock(&vq->mutex); 530433fc58eSAsias He 531433fc58eSAsias He if (!vhost_vq_access_ok(vq)) { 532433fc58eSAsias He ret = -EFAULT; 533433fc58eSAsias He goto err_vq; 534433fc58eSAsias He } 535433fc58eSAsias He 536433fc58eSAsias He if (!vq->private_data) { 537433fc58eSAsias He vq->private_data = vsock; 5380516ffd8SStefan Hajnoczi ret = vhost_vq_init_access(vq); 5390516ffd8SStefan Hajnoczi if (ret) 5400516ffd8SStefan Hajnoczi goto err_vq; 541433fc58eSAsias He } 542433fc58eSAsias He 543433fc58eSAsias He mutex_unlock(&vq->mutex); 544433fc58eSAsias He } 545433fc58eSAsias He 546433fc58eSAsias He mutex_unlock(&vsock->dev.mutex); 547433fc58eSAsias He return 0; 548433fc58eSAsias He 549433fc58eSAsias He err_vq: 5500516ffd8SStefan Hajnoczi vq->private_data = NULL; 5510516ffd8SStefan Hajnoczi mutex_unlock(&vq->mutex); 5520516ffd8SStefan Hajnoczi 553433fc58eSAsias He for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 5540516ffd8SStefan Hajnoczi vq = &vsock->vqs[i]; 555433fc58eSAsias He 556433fc58eSAsias He mutex_lock(&vq->mutex); 557433fc58eSAsias He vq->private_data = NULL; 558433fc58eSAsias He mutex_unlock(&vq->mutex); 559433fc58eSAsias He } 560433fc58eSAsias He err: 561433fc58eSAsias He mutex_unlock(&vsock->dev.mutex); 562433fc58eSAsias He return ret; 563433fc58eSAsias He } 564433fc58eSAsias He 565433fc58eSAsias He static int vhost_vsock_stop(struct vhost_vsock *vsock) 566433fc58eSAsias He { 567433fc58eSAsias He size_t i; 568433fc58eSAsias He int ret; 569433fc58eSAsias He 570433fc58eSAsias He mutex_lock(&vsock->dev.mutex); 571433fc58eSAsias He 572433fc58eSAsias He ret = vhost_dev_check_owner(&vsock->dev); 573433fc58eSAsias He if (ret) 574433fc58eSAsias He goto err; 575433fc58eSAsias He 576433fc58eSAsias He for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 577433fc58eSAsias He struct vhost_virtqueue *vq = &vsock->vqs[i]; 578433fc58eSAsias He 579433fc58eSAsias He mutex_lock(&vq->mutex); 580433fc58eSAsias He vq->private_data = NULL; 581433fc58eSAsias He mutex_unlock(&vq->mutex); 582433fc58eSAsias He } 583433fc58eSAsias He 584433fc58eSAsias He err: 585433fc58eSAsias He mutex_unlock(&vsock->dev.mutex); 586433fc58eSAsias He return ret; 587433fc58eSAsias He } 588433fc58eSAsias He 589433fc58eSAsias He static void vhost_vsock_free(struct vhost_vsock *vsock) 590433fc58eSAsias He { 591b226acabSWei Yongjun kvfree(vsock); 592433fc58eSAsias He } 593433fc58eSAsias He 594433fc58eSAsias He static int vhost_vsock_dev_open(struct inode *inode, struct file *file) 595433fc58eSAsias He { 596433fc58eSAsias He struct vhost_virtqueue **vqs; 597433fc58eSAsias He struct vhost_vsock *vsock; 598433fc58eSAsias He int ret; 599433fc58eSAsias He 600433fc58eSAsias He /* This struct is large and allocation could fail, fall back to vmalloc 601433fc58eSAsias He * if there is no other way. 602433fc58eSAsias He */ 603dcda9b04SMichal Hocko vsock = kvmalloc(sizeof(*vsock), GFP_KERNEL | __GFP_RETRY_MAYFAIL); 604433fc58eSAsias He if (!vsock) 605433fc58eSAsias He return -ENOMEM; 606433fc58eSAsias He 607433fc58eSAsias He vqs = kmalloc_array(ARRAY_SIZE(vsock->vqs), sizeof(*vqs), GFP_KERNEL); 608433fc58eSAsias He if (!vqs) { 609433fc58eSAsias He ret = -ENOMEM; 610433fc58eSAsias He goto out; 611433fc58eSAsias He } 612433fc58eSAsias He 613a72b69dcSStefan Hajnoczi vsock->guest_cid = 0; /* no CID assigned yet */ 614a72b69dcSStefan Hajnoczi 615433fc58eSAsias He atomic_set(&vsock->queued_replies, 0); 616433fc58eSAsias He 617433fc58eSAsias He vqs[VSOCK_VQ_TX] = &vsock->vqs[VSOCK_VQ_TX]; 618433fc58eSAsias He vqs[VSOCK_VQ_RX] = &vsock->vqs[VSOCK_VQ_RX]; 619433fc58eSAsias He vsock->vqs[VSOCK_VQ_TX].handle_kick = vhost_vsock_handle_tx_kick; 620433fc58eSAsias He vsock->vqs[VSOCK_VQ_RX].handle_kick = vhost_vsock_handle_rx_kick; 621433fc58eSAsias He 622e82b9b07SJason Wang vhost_dev_init(&vsock->dev, vqs, ARRAY_SIZE(vsock->vqs), 623e82b9b07SJason Wang UIO_MAXIOV, VHOST_VSOCK_PKT_WEIGHT, 624e82b9b07SJason Wang VHOST_VSOCK_WEIGHT); 625433fc58eSAsias He 626433fc58eSAsias He file->private_data = vsock; 627433fc58eSAsias He spin_lock_init(&vsock->send_pkt_list_lock); 628433fc58eSAsias He INIT_LIST_HEAD(&vsock->send_pkt_list); 629433fc58eSAsias He vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work); 630433fc58eSAsias He return 0; 631433fc58eSAsias He 632433fc58eSAsias He out: 633433fc58eSAsias He vhost_vsock_free(vsock); 634433fc58eSAsias He return ret; 635433fc58eSAsias He } 636433fc58eSAsias He 637433fc58eSAsias He static void vhost_vsock_flush(struct vhost_vsock *vsock) 638433fc58eSAsias He { 639433fc58eSAsias He int i; 640433fc58eSAsias He 641433fc58eSAsias He for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) 642433fc58eSAsias He if (vsock->vqs[i].handle_kick) 643433fc58eSAsias He vhost_poll_flush(&vsock->vqs[i].poll); 644433fc58eSAsias He vhost_work_flush(&vsock->dev, &vsock->send_pkt_work); 645433fc58eSAsias He } 646433fc58eSAsias He 647433fc58eSAsias He static void vhost_vsock_reset_orphans(struct sock *sk) 648433fc58eSAsias He { 649433fc58eSAsias He struct vsock_sock *vsk = vsock_sk(sk); 650433fc58eSAsias He 651433fc58eSAsias He /* vmci_transport.c doesn't take sk_lock here either. At least we're 652433fc58eSAsias He * under vsock_table_lock so the sock cannot disappear while we're 653433fc58eSAsias He * executing. 654433fc58eSAsias He */ 655433fc58eSAsias He 656c38f57daSStefan Hajnoczi /* If the peer is still valid, no need to reset connection */ 657c38f57daSStefan Hajnoczi if (vhost_vsock_get(vsk->remote_addr.svm_cid)) 658c38f57daSStefan Hajnoczi return; 659c38f57daSStefan Hajnoczi 660c38f57daSStefan Hajnoczi /* If the close timeout is pending, let it expire. This avoids races 661c38f57daSStefan Hajnoczi * with the timeout callback. 662c38f57daSStefan Hajnoczi */ 663c38f57daSStefan Hajnoczi if (vsk->close_work_scheduled) 664c38f57daSStefan Hajnoczi return; 665c38f57daSStefan Hajnoczi 666433fc58eSAsias He sock_set_flag(sk, SOCK_DONE); 667433fc58eSAsias He vsk->peer_shutdown = SHUTDOWN_MASK; 668433fc58eSAsias He sk->sk_state = SS_UNCONNECTED; 669433fc58eSAsias He sk->sk_err = ECONNRESET; 670433fc58eSAsias He sk->sk_error_report(sk); 671433fc58eSAsias He } 672433fc58eSAsias He 673433fc58eSAsias He static int vhost_vsock_dev_release(struct inode *inode, struct file *file) 674433fc58eSAsias He { 675433fc58eSAsias He struct vhost_vsock *vsock = file->private_data; 676433fc58eSAsias He 6776db3d8dcSStefan Hajnoczi mutex_lock(&vhost_vsock_mutex); 678834e772cSStefan Hajnoczi if (vsock->guest_cid) 679834e772cSStefan Hajnoczi hash_del_rcu(&vsock->hash); 6806db3d8dcSStefan Hajnoczi mutex_unlock(&vhost_vsock_mutex); 681433fc58eSAsias He 682834e772cSStefan Hajnoczi /* Wait for other CPUs to finish using vsock */ 683834e772cSStefan Hajnoczi synchronize_rcu(); 684834e772cSStefan Hajnoczi 685433fc58eSAsias He /* Iterating over all connections for all CIDs to find orphans is 686433fc58eSAsias He * inefficient. Room for improvement here. */ 687433fc58eSAsias He vsock_for_each_connected_socket(vhost_vsock_reset_orphans); 688433fc58eSAsias He 689433fc58eSAsias He vhost_vsock_stop(vsock); 690433fc58eSAsias He vhost_vsock_flush(vsock); 691433fc58eSAsias He vhost_dev_stop(&vsock->dev); 692433fc58eSAsias He 693433fc58eSAsias He spin_lock_bh(&vsock->send_pkt_list_lock); 694433fc58eSAsias He while (!list_empty(&vsock->send_pkt_list)) { 695433fc58eSAsias He struct virtio_vsock_pkt *pkt; 696433fc58eSAsias He 697433fc58eSAsias He pkt = list_first_entry(&vsock->send_pkt_list, 698433fc58eSAsias He struct virtio_vsock_pkt, list); 699433fc58eSAsias He list_del_init(&pkt->list); 700433fc58eSAsias He virtio_transport_free_pkt(pkt); 701433fc58eSAsias He } 702433fc58eSAsias He spin_unlock_bh(&vsock->send_pkt_list_lock); 703433fc58eSAsias He 704f6f93f75S夷则(Caspar) vhost_dev_cleanup(&vsock->dev); 705433fc58eSAsias He kfree(vsock->dev.vqs); 706433fc58eSAsias He vhost_vsock_free(vsock); 707433fc58eSAsias He return 0; 708433fc58eSAsias He } 709433fc58eSAsias He 710433fc58eSAsias He static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid) 711433fc58eSAsias He { 712433fc58eSAsias He struct vhost_vsock *other; 713433fc58eSAsias He 714433fc58eSAsias He /* Refuse reserved CIDs */ 715433fc58eSAsias He if (guest_cid <= VMADDR_CID_HOST || 716433fc58eSAsias He guest_cid == U32_MAX) 717433fc58eSAsias He return -EINVAL; 718433fc58eSAsias He 719433fc58eSAsias He /* 64-bit CIDs are not yet supported */ 720433fc58eSAsias He if (guest_cid > U32_MAX) 721433fc58eSAsias He return -EINVAL; 722433fc58eSAsias He 723ed8640a9SStefano Garzarella /* Refuse if CID is assigned to the guest->host transport (i.e. nested 724ed8640a9SStefano Garzarella * VM), to make the loopback work. 725ed8640a9SStefano Garzarella */ 726ed8640a9SStefano Garzarella if (vsock_find_cid(guest_cid)) 727ed8640a9SStefano Garzarella return -EADDRINUSE; 728ed8640a9SStefano Garzarella 729433fc58eSAsias He /* Refuse if CID is already in use */ 7306db3d8dcSStefan Hajnoczi mutex_lock(&vhost_vsock_mutex); 731834e772cSStefan Hajnoczi other = vhost_vsock_get(guest_cid); 7326c083c2bSGao feng if (other && other != vsock) { 7336db3d8dcSStefan Hajnoczi mutex_unlock(&vhost_vsock_mutex); 7346c083c2bSGao feng return -EADDRINUSE; 7356c083c2bSGao feng } 736834e772cSStefan Hajnoczi 737834e772cSStefan Hajnoczi if (vsock->guest_cid) 738834e772cSStefan Hajnoczi hash_del_rcu(&vsock->hash); 739834e772cSStefan Hajnoczi 740433fc58eSAsias He vsock->guest_cid = guest_cid; 7417fbe078cSZha Bin hash_add_rcu(vhost_vsock_hash, &vsock->hash, vsock->guest_cid); 7426db3d8dcSStefan Hajnoczi mutex_unlock(&vhost_vsock_mutex); 743433fc58eSAsias He 744433fc58eSAsias He return 0; 745433fc58eSAsias He } 746433fc58eSAsias He 747433fc58eSAsias He static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features) 748433fc58eSAsias He { 749433fc58eSAsias He struct vhost_virtqueue *vq; 750433fc58eSAsias He int i; 751433fc58eSAsias He 752433fc58eSAsias He if (features & ~VHOST_VSOCK_FEATURES) 753433fc58eSAsias He return -EOPNOTSUPP; 754433fc58eSAsias He 755433fc58eSAsias He mutex_lock(&vsock->dev.mutex); 756433fc58eSAsias He if ((features & (1 << VHOST_F_LOG_ALL)) && 757433fc58eSAsias He !vhost_log_access_ok(&vsock->dev)) { 758433fc58eSAsias He mutex_unlock(&vsock->dev.mutex); 759433fc58eSAsias He return -EFAULT; 760433fc58eSAsias He } 761433fc58eSAsias He 762433fc58eSAsias He for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 763433fc58eSAsias He vq = &vsock->vqs[i]; 764433fc58eSAsias He mutex_lock(&vq->mutex); 765433fc58eSAsias He vq->acked_features = features; 766433fc58eSAsias He mutex_unlock(&vq->mutex); 767433fc58eSAsias He } 768433fc58eSAsias He mutex_unlock(&vsock->dev.mutex); 769433fc58eSAsias He return 0; 770433fc58eSAsias He } 771433fc58eSAsias He 772433fc58eSAsias He static long vhost_vsock_dev_ioctl(struct file *f, unsigned int ioctl, 773433fc58eSAsias He unsigned long arg) 774433fc58eSAsias He { 775433fc58eSAsias He struct vhost_vsock *vsock = f->private_data; 776433fc58eSAsias He void __user *argp = (void __user *)arg; 777433fc58eSAsias He u64 guest_cid; 778433fc58eSAsias He u64 features; 779433fc58eSAsias He int start; 780433fc58eSAsias He int r; 781433fc58eSAsias He 782433fc58eSAsias He switch (ioctl) { 783433fc58eSAsias He case VHOST_VSOCK_SET_GUEST_CID: 784433fc58eSAsias He if (copy_from_user(&guest_cid, argp, sizeof(guest_cid))) 785433fc58eSAsias He return -EFAULT; 786433fc58eSAsias He return vhost_vsock_set_cid(vsock, guest_cid); 787433fc58eSAsias He case VHOST_VSOCK_SET_RUNNING: 788433fc58eSAsias He if (copy_from_user(&start, argp, sizeof(start))) 789433fc58eSAsias He return -EFAULT; 790433fc58eSAsias He if (start) 791433fc58eSAsias He return vhost_vsock_start(vsock); 792433fc58eSAsias He else 793433fc58eSAsias He return vhost_vsock_stop(vsock); 794433fc58eSAsias He case VHOST_GET_FEATURES: 795433fc58eSAsias He features = VHOST_VSOCK_FEATURES; 796433fc58eSAsias He if (copy_to_user(argp, &features, sizeof(features))) 797433fc58eSAsias He return -EFAULT; 798433fc58eSAsias He return 0; 799433fc58eSAsias He case VHOST_SET_FEATURES: 800433fc58eSAsias He if (copy_from_user(&features, argp, sizeof(features))) 801433fc58eSAsias He return -EFAULT; 802433fc58eSAsias He return vhost_vsock_set_features(vsock, features); 803433fc58eSAsias He default: 804433fc58eSAsias He mutex_lock(&vsock->dev.mutex); 805433fc58eSAsias He r = vhost_dev_ioctl(&vsock->dev, ioctl, argp); 806433fc58eSAsias He if (r == -ENOIOCTLCMD) 807433fc58eSAsias He r = vhost_vring_ioctl(&vsock->dev, ioctl, argp); 808433fc58eSAsias He else 809433fc58eSAsias He vhost_vsock_flush(vsock); 810433fc58eSAsias He mutex_unlock(&vsock->dev.mutex); 811433fc58eSAsias He return r; 812433fc58eSAsias He } 813433fc58eSAsias He } 814433fc58eSAsias He 815433fc58eSAsias He static const struct file_operations vhost_vsock_fops = { 816433fc58eSAsias He .owner = THIS_MODULE, 817433fc58eSAsias He .open = vhost_vsock_dev_open, 818433fc58eSAsias He .release = vhost_vsock_dev_release, 819433fc58eSAsias He .llseek = noop_llseek, 820433fc58eSAsias He .unlocked_ioctl = vhost_vsock_dev_ioctl, 821407e9ef7SArnd Bergmann .compat_ioctl = compat_ptr_ioctl, 822433fc58eSAsias He }; 823433fc58eSAsias He 824433fc58eSAsias He static struct miscdevice vhost_vsock_misc = { 825f4660cc9SStefan Hajnoczi .minor = VHOST_VSOCK_MINOR, 826433fc58eSAsias He .name = "vhost-vsock", 827433fc58eSAsias He .fops = &vhost_vsock_fops, 828433fc58eSAsias He }; 829433fc58eSAsias He 830433fc58eSAsias He static int __init vhost_vsock_init(void) 831433fc58eSAsias He { 832433fc58eSAsias He int ret; 833433fc58eSAsias He 834c0cfa2d8SStefano Garzarella ret = vsock_core_register(&vhost_transport.transport, 835c0cfa2d8SStefano Garzarella VSOCK_TRANSPORT_F_H2G); 836433fc58eSAsias He if (ret < 0) 837433fc58eSAsias He return ret; 838433fc58eSAsias He return misc_register(&vhost_vsock_misc); 839433fc58eSAsias He }; 840433fc58eSAsias He 841433fc58eSAsias He static void __exit vhost_vsock_exit(void) 842433fc58eSAsias He { 843433fc58eSAsias He misc_deregister(&vhost_vsock_misc); 844c0cfa2d8SStefano Garzarella vsock_core_unregister(&vhost_transport.transport); 845433fc58eSAsias He }; 846433fc58eSAsias He 847433fc58eSAsias He module_init(vhost_vsock_init); 848433fc58eSAsias He module_exit(vhost_vsock_exit); 849433fc58eSAsias He MODULE_LICENSE("GPL v2"); 850433fc58eSAsias He MODULE_AUTHOR("Asias He"); 851433fc58eSAsias He MODULE_DESCRIPTION("vhost transport for vsock "); 852f4660cc9SStefan Hajnoczi MODULE_ALIAS_MISCDEV(VHOST_VSOCK_MINOR); 853f4660cc9SStefan Hajnoczi MODULE_ALIAS("devname:vhost-vsock"); 854