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 { 33e13a6915SStefano Garzarella VHOST_VSOCK_FEATURES = VHOST_FEATURES | 34ced7b713SArseny Krasnov (1ULL << VIRTIO_F_ACCESS_PLATFORM) | 35ced7b713SArseny Krasnov (1ULL << VIRTIO_VSOCK_F_SEQPACKET) 36e13a6915SStefano Garzarella }; 37e13a6915SStefano Garzarella 38e13a6915SStefano Garzarella enum { 39e13a6915SStefano Garzarella VHOST_VSOCK_BACKEND_FEATURES = (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2) 40433fc58eSAsias He }; 41433fc58eSAsias He 42433fc58eSAsias He /* Used to track all the vhost_vsock instances on the system. */ 436db3d8dcSStefan Hajnoczi static DEFINE_MUTEX(vhost_vsock_mutex); 44834e772cSStefan Hajnoczi static DEFINE_READ_MOSTLY_HASHTABLE(vhost_vsock_hash, 8); 45433fc58eSAsias He 46433fc58eSAsias He struct vhost_vsock { 47433fc58eSAsias He struct vhost_dev dev; 48433fc58eSAsias He struct vhost_virtqueue vqs[2]; 49433fc58eSAsias He 506db3d8dcSStefan Hajnoczi /* Link to global vhost_vsock_hash, writes use vhost_vsock_mutex */ 51834e772cSStefan Hajnoczi struct hlist_node hash; 52433fc58eSAsias He 53433fc58eSAsias He struct vhost_work send_pkt_work; 5471dc9ec9SBobby Eshleman struct sk_buff_head send_pkt_queue; /* host->guest pending packets */ 55433fc58eSAsias He 56433fc58eSAsias He atomic_t queued_replies; 57433fc58eSAsias He 58433fc58eSAsias He u32 guest_cid; 59ced7b713SArseny Krasnov bool seqpacket_allow; 60433fc58eSAsias He }; 61433fc58eSAsias He 62433fc58eSAsias He static u32 vhost_transport_get_local_cid(void) 63433fc58eSAsias He { 64433fc58eSAsias He return VHOST_VSOCK_DEFAULT_HOST_CID; 65433fc58eSAsias He } 66433fc58eSAsias He 676db3d8dcSStefan Hajnoczi /* Callers that dereference the return value must hold vhost_vsock_mutex or the 68834e772cSStefan Hajnoczi * RCU read lock. 69834e772cSStefan Hajnoczi */ 70834e772cSStefan Hajnoczi static struct vhost_vsock *vhost_vsock_get(u32 guest_cid) 71433fc58eSAsias He { 72433fc58eSAsias He struct vhost_vsock *vsock; 73433fc58eSAsias He 74834e772cSStefan Hajnoczi hash_for_each_possible_rcu(vhost_vsock_hash, vsock, hash, guest_cid) { 75433fc58eSAsias He u32 other_cid = vsock->guest_cid; 76433fc58eSAsias He 77433fc58eSAsias He /* Skip instances that have no CID yet */ 78433fc58eSAsias He if (other_cid == 0) 79433fc58eSAsias He continue; 80433fc58eSAsias He 81ff3c1b1aSVaibhav Murkute if (other_cid == guest_cid) 82433fc58eSAsias He return vsock; 83ff3c1b1aSVaibhav Murkute 84433fc58eSAsias He } 85433fc58eSAsias He 86433fc58eSAsias He return NULL; 87433fc58eSAsias He } 88433fc58eSAsias He 89433fc58eSAsias He static void 90433fc58eSAsias He vhost_transport_do_send_pkt(struct vhost_vsock *vsock, 91433fc58eSAsias He struct vhost_virtqueue *vq) 92433fc58eSAsias He { 93433fc58eSAsias He struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX]; 94e79b431fSJason Wang int pkts = 0, total_len = 0; 95433fc58eSAsias He bool added = false; 96433fc58eSAsias He bool restart_tx = false; 97433fc58eSAsias He 98433fc58eSAsias He mutex_lock(&vq->mutex); 99433fc58eSAsias He 100247643f8SEugenio Pérez if (!vhost_vq_get_backend(vq)) 101433fc58eSAsias He goto out; 102433fc58eSAsias He 103e13a6915SStefano Garzarella if (!vq_meta_prefetch(vq)) 104e13a6915SStefano Garzarella goto out; 105e13a6915SStefano Garzarella 106433fc58eSAsias He /* Avoid further vmexits, we're already processing the virtqueue */ 107433fc58eSAsias He vhost_disable_notify(&vsock->dev, vq); 108433fc58eSAsias He 109e79b431fSJason Wang do { 11071dc9ec9SBobby Eshleman struct virtio_vsock_hdr *hdr; 11171dc9ec9SBobby Eshleman size_t iov_len, payload_len; 112433fc58eSAsias He struct iov_iter iov_iter; 11371dc9ec9SBobby Eshleman u32 flags_to_restore = 0; 11471dc9ec9SBobby Eshleman struct sk_buff *skb; 115433fc58eSAsias He unsigned out, in; 116433fc58eSAsias He size_t nbytes; 117433fc58eSAsias He int head; 118433fc58eSAsias He 11971dc9ec9SBobby Eshleman skb = virtio_vsock_skb_dequeue(&vsock->send_pkt_queue); 12071dc9ec9SBobby Eshleman 12171dc9ec9SBobby Eshleman if (!skb) { 122433fc58eSAsias He vhost_enable_notify(&vsock->dev, vq); 123433fc58eSAsias He break; 124433fc58eSAsias He } 125433fc58eSAsias He 126433fc58eSAsias He head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), 127433fc58eSAsias He &out, &in, NULL, NULL); 128433fc58eSAsias He if (head < 0) { 12971dc9ec9SBobby Eshleman virtio_vsock_skb_queue_head(&vsock->send_pkt_queue, skb); 130433fc58eSAsias He break; 131433fc58eSAsias He } 132433fc58eSAsias He 133433fc58eSAsias He if (head == vq->num) { 13471dc9ec9SBobby Eshleman virtio_vsock_skb_queue_head(&vsock->send_pkt_queue, skb); 135433fc58eSAsias He /* We cannot finish yet if more buffers snuck in while 136433fc58eSAsias He * re-enabling notify. 137433fc58eSAsias He */ 138433fc58eSAsias He if (unlikely(vhost_enable_notify(&vsock->dev, vq))) { 139433fc58eSAsias He vhost_disable_notify(&vsock->dev, vq); 140433fc58eSAsias He continue; 141433fc58eSAsias He } 142433fc58eSAsias He break; 143433fc58eSAsias He } 144433fc58eSAsias He 145433fc58eSAsias He if (out) { 14671dc9ec9SBobby Eshleman kfree_skb(skb); 147433fc58eSAsias He vq_err(vq, "Expected 0 output buffers, got %u\n", out); 148433fc58eSAsias He break; 149433fc58eSAsias He } 150433fc58eSAsias He 1516dbd3e66SStefano Garzarella iov_len = iov_length(&vq->iov[out], in); 15271dc9ec9SBobby Eshleman if (iov_len < sizeof(*hdr)) { 15371dc9ec9SBobby Eshleman kfree_skb(skb); 1546dbd3e66SStefano Garzarella vq_err(vq, "Buffer len [%zu] too small\n", iov_len); 1556dbd3e66SStefano Garzarella break; 1566dbd3e66SStefano Garzarella } 1576dbd3e66SStefano Garzarella 158de4eda9dSAl Viro iov_iter_init(&iov_iter, ITER_DEST, &vq->iov[out], in, iov_len); 15971dc9ec9SBobby Eshleman payload_len = skb->len; 16071dc9ec9SBobby Eshleman hdr = virtio_vsock_hdr(skb); 1616dbd3e66SStefano Garzarella 1626dbd3e66SStefano Garzarella /* If the packet is greater than the space available in the 1636dbd3e66SStefano Garzarella * buffer, we split it using multiple buffers. 1646dbd3e66SStefano Garzarella */ 16571dc9ec9SBobby Eshleman if (payload_len > iov_len - sizeof(*hdr)) { 16671dc9ec9SBobby Eshleman payload_len = iov_len - sizeof(*hdr); 1676dbd3e66SStefano Garzarella 168ced7b713SArseny Krasnov /* As we are copying pieces of large packet's buffer to 169ced7b713SArseny Krasnov * small rx buffers, headers of packets in rx queue are 170ced7b713SArseny Krasnov * created dynamically and are initialized with header 171ced7b713SArseny Krasnov * of current packet(except length). But in case of 1729af8f106SArseny Krasnov * SOCK_SEQPACKET, we also must clear message delimeter 1731af7e555SArseny Krasnov * bit (VIRTIO_VSOCK_SEQ_EOM) and MSG_EOR bit 1741af7e555SArseny Krasnov * (VIRTIO_VSOCK_SEQ_EOR) if set. Otherwise, 1751af7e555SArseny Krasnov * there will be sequence of packets with these 1761af7e555SArseny Krasnov * bits set. After initialized header will be copied to 1771af7e555SArseny Krasnov * rx buffer, these required bits will be restored. 178ced7b713SArseny Krasnov */ 17971dc9ec9SBobby Eshleman if (le32_to_cpu(hdr->flags) & VIRTIO_VSOCK_SEQ_EOM) { 18071dc9ec9SBobby Eshleman hdr->flags &= ~cpu_to_le32(VIRTIO_VSOCK_SEQ_EOM); 1811af7e555SArseny Krasnov flags_to_restore |= VIRTIO_VSOCK_SEQ_EOM; 1821af7e555SArseny Krasnov 18371dc9ec9SBobby Eshleman if (le32_to_cpu(hdr->flags) & VIRTIO_VSOCK_SEQ_EOR) { 18471dc9ec9SBobby Eshleman hdr->flags &= ~cpu_to_le32(VIRTIO_VSOCK_SEQ_EOR); 1851af7e555SArseny Krasnov flags_to_restore |= VIRTIO_VSOCK_SEQ_EOR; 1861af7e555SArseny Krasnov } 187ced7b713SArseny Krasnov } 188ced7b713SArseny Krasnov } 189ced7b713SArseny Krasnov 1906dbd3e66SStefano Garzarella /* Set the correct length in the header */ 19171dc9ec9SBobby Eshleman hdr->len = cpu_to_le32(payload_len); 192433fc58eSAsias He 19371dc9ec9SBobby Eshleman nbytes = copy_to_iter(hdr, sizeof(*hdr), &iov_iter); 19471dc9ec9SBobby Eshleman if (nbytes != sizeof(*hdr)) { 19571dc9ec9SBobby Eshleman kfree_skb(skb); 196433fc58eSAsias He vq_err(vq, "Faulted on copying pkt hdr\n"); 197433fc58eSAsias He break; 198433fc58eSAsias He } 199433fc58eSAsias He 20071dc9ec9SBobby Eshleman nbytes = copy_to_iter(skb->data, payload_len, &iov_iter); 2016dbd3e66SStefano Garzarella if (nbytes != payload_len) { 20271dc9ec9SBobby Eshleman kfree_skb(skb); 203433fc58eSAsias He vq_err(vq, "Faulted on copying pkt buf\n"); 204433fc58eSAsias He break; 205433fc58eSAsias He } 206433fc58eSAsias He 207107bc076SStefano Garzarella /* Deliver to monitoring devices all packets that we 208107bc076SStefano Garzarella * will transmit. 20982dfb540SGerard Garcia */ 21071dc9ec9SBobby Eshleman virtio_transport_deliver_tap_pkt(skb); 21182dfb540SGerard Garcia 21271dc9ec9SBobby Eshleman vhost_add_used(vq, head, sizeof(*hdr) + payload_len); 213107bc076SStefano Garzarella added = true; 214107bc076SStefano Garzarella 21571dc9ec9SBobby Eshleman skb_pull(skb, payload_len); 2166dbd3e66SStefano Garzarella total_len += payload_len; 2176dbd3e66SStefano Garzarella 2186dbd3e66SStefano Garzarella /* If we didn't send all the payload we can requeue the packet 2196dbd3e66SStefano Garzarella * to send it with the next available buffer. 2206dbd3e66SStefano Garzarella */ 22171dc9ec9SBobby Eshleman if (skb->len > 0) { 22271dc9ec9SBobby Eshleman hdr->flags |= cpu_to_le32(flags_to_restore); 223ced7b713SArseny Krasnov 22471dc9ec9SBobby Eshleman /* We are queueing the same skb to handle 225a78d1639SStefano Garzarella * the remaining bytes, and we want to deliver it 226a78d1639SStefano Garzarella * to monitoring devices in the next iteration. 227a78d1639SStefano Garzarella */ 22871dc9ec9SBobby Eshleman virtio_vsock_skb_clear_tap_delivered(skb); 22971dc9ec9SBobby Eshleman virtio_vsock_skb_queue_head(&vsock->send_pkt_queue, skb); 2306dbd3e66SStefano Garzarella } else { 23171dc9ec9SBobby Eshleman if (virtio_vsock_skb_reply(skb)) { 2326dbd3e66SStefano Garzarella int val; 2336dbd3e66SStefano Garzarella 2346dbd3e66SStefano Garzarella val = atomic_dec_return(&vsock->queued_replies); 2356dbd3e66SStefano Garzarella 2366dbd3e66SStefano Garzarella /* Do we have resources to resume tx 2376dbd3e66SStefano Garzarella * processing? 2386dbd3e66SStefano Garzarella */ 2396dbd3e66SStefano Garzarella if (val + 1 == tx_vq->num) 2406dbd3e66SStefano Garzarella restart_tx = true; 2416dbd3e66SStefano Garzarella } 2426dbd3e66SStefano Garzarella 24371dc9ec9SBobby Eshleman consume_skb(skb); 2446dbd3e66SStefano Garzarella } 245e79b431fSJason Wang } while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len))); 246433fc58eSAsias He if (added) 247433fc58eSAsias He vhost_signal(&vsock->dev, vq); 248433fc58eSAsias He 249433fc58eSAsias He out: 250433fc58eSAsias He mutex_unlock(&vq->mutex); 251433fc58eSAsias He 252433fc58eSAsias He if (restart_tx) 253433fc58eSAsias He vhost_poll_queue(&tx_vq->poll); 254433fc58eSAsias He } 255433fc58eSAsias He 256433fc58eSAsias He static void vhost_transport_send_pkt_work(struct vhost_work *work) 257433fc58eSAsias He { 258433fc58eSAsias He struct vhost_virtqueue *vq; 259433fc58eSAsias He struct vhost_vsock *vsock; 260433fc58eSAsias He 261433fc58eSAsias He vsock = container_of(work, struct vhost_vsock, send_pkt_work); 262433fc58eSAsias He vq = &vsock->vqs[VSOCK_VQ_RX]; 263433fc58eSAsias He 264433fc58eSAsias He vhost_transport_do_send_pkt(vsock, vq); 265433fc58eSAsias He } 266433fc58eSAsias He 267433fc58eSAsias He static int 26871dc9ec9SBobby Eshleman vhost_transport_send_pkt(struct sk_buff *skb) 269433fc58eSAsias He { 27071dc9ec9SBobby Eshleman struct virtio_vsock_hdr *hdr = virtio_vsock_hdr(skb); 271433fc58eSAsias He struct vhost_vsock *vsock; 27271dc9ec9SBobby Eshleman int len = skb->len; 273433fc58eSAsias He 274834e772cSStefan Hajnoczi rcu_read_lock(); 275834e772cSStefan Hajnoczi 276433fc58eSAsias He /* Find the vhost_vsock according to guest context id */ 27771dc9ec9SBobby Eshleman vsock = vhost_vsock_get(le64_to_cpu(hdr->dst_cid)); 278433fc58eSAsias He if (!vsock) { 279834e772cSStefan Hajnoczi rcu_read_unlock(); 28071dc9ec9SBobby Eshleman kfree_skb(skb); 281433fc58eSAsias He return -ENODEV; 282433fc58eSAsias He } 283433fc58eSAsias He 28471dc9ec9SBobby Eshleman if (virtio_vsock_skb_reply(skb)) 285433fc58eSAsias He atomic_inc(&vsock->queued_replies); 286433fc58eSAsias He 28771dc9ec9SBobby Eshleman virtio_vsock_skb_queue_tail(&vsock->send_pkt_queue, skb); 288*9e09d0ecSMike Christie vhost_vq_work_queue(&vsock->vqs[VSOCK_VQ_RX], &vsock->send_pkt_work); 289834e772cSStefan Hajnoczi 290834e772cSStefan Hajnoczi rcu_read_unlock(); 291433fc58eSAsias He return len; 292433fc58eSAsias He } 293433fc58eSAsias He 29416320f36SPeng Tao static int 29516320f36SPeng Tao vhost_transport_cancel_pkt(struct vsock_sock *vsk) 29616320f36SPeng Tao { 29716320f36SPeng Tao struct vhost_vsock *vsock; 29816320f36SPeng Tao int cnt = 0; 299834e772cSStefan Hajnoczi int ret = -ENODEV; 30016320f36SPeng Tao 301834e772cSStefan Hajnoczi rcu_read_lock(); 302834e772cSStefan Hajnoczi 30316320f36SPeng Tao /* Find the vhost_vsock according to guest context id */ 30416320f36SPeng Tao vsock = vhost_vsock_get(vsk->remote_addr.svm_cid); 30516320f36SPeng Tao if (!vsock) 306834e772cSStefan Hajnoczi goto out; 30716320f36SPeng Tao 30871dc9ec9SBobby Eshleman cnt = virtio_transport_purge_skbs(vsk, &vsock->send_pkt_queue); 30916320f36SPeng Tao 31016320f36SPeng Tao if (cnt) { 31116320f36SPeng Tao struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX]; 31216320f36SPeng Tao int new_cnt; 31316320f36SPeng Tao 31416320f36SPeng Tao new_cnt = atomic_sub_return(cnt, &vsock->queued_replies); 31516320f36SPeng Tao if (new_cnt + cnt >= tx_vq->num && new_cnt < tx_vq->num) 31616320f36SPeng Tao vhost_poll_queue(&tx_vq->poll); 31716320f36SPeng Tao } 31816320f36SPeng Tao 319834e772cSStefan Hajnoczi ret = 0; 320834e772cSStefan Hajnoczi out: 321834e772cSStefan Hajnoczi rcu_read_unlock(); 322834e772cSStefan Hajnoczi return ret; 32316320f36SPeng Tao } 32416320f36SPeng Tao 32571dc9ec9SBobby Eshleman static struct sk_buff * 32671dc9ec9SBobby Eshleman vhost_vsock_alloc_skb(struct vhost_virtqueue *vq, 327433fc58eSAsias He unsigned int out, unsigned int in) 328433fc58eSAsias He { 32971dc9ec9SBobby Eshleman struct virtio_vsock_hdr *hdr; 330433fc58eSAsias He struct iov_iter iov_iter; 33171dc9ec9SBobby Eshleman struct sk_buff *skb; 33271dc9ec9SBobby Eshleman size_t payload_len; 333433fc58eSAsias He size_t nbytes; 334433fc58eSAsias He size_t len; 335433fc58eSAsias He 336433fc58eSAsias He if (in != 0) { 337433fc58eSAsias He vq_err(vq, "Expected 0 input buffers, got %u\n", in); 338433fc58eSAsias He return NULL; 339433fc58eSAsias He } 340433fc58eSAsias He 34171dc9ec9SBobby Eshleman len = iov_length(vq->iov, out); 34271dc9ec9SBobby Eshleman 34371dc9ec9SBobby Eshleman /* len contains both payload and hdr */ 34471dc9ec9SBobby Eshleman skb = virtio_vsock_alloc_skb(len, GFP_KERNEL); 34571dc9ec9SBobby Eshleman if (!skb) 346433fc58eSAsias He return NULL; 347433fc58eSAsias He 348de4eda9dSAl Viro iov_iter_init(&iov_iter, ITER_SOURCE, vq->iov, out, len); 349433fc58eSAsias He 35071dc9ec9SBobby Eshleman hdr = virtio_vsock_hdr(skb); 35171dc9ec9SBobby Eshleman nbytes = copy_from_iter(hdr, sizeof(*hdr), &iov_iter); 35271dc9ec9SBobby Eshleman if (nbytes != sizeof(*hdr)) { 353433fc58eSAsias He vq_err(vq, "Expected %zu bytes for pkt->hdr, got %zu bytes\n", 35471dc9ec9SBobby Eshleman sizeof(*hdr), nbytes); 35571dc9ec9SBobby Eshleman kfree_skb(skb); 356433fc58eSAsias He return NULL; 357433fc58eSAsias He } 358433fc58eSAsias He 35971dc9ec9SBobby Eshleman payload_len = le32_to_cpu(hdr->len); 360433fc58eSAsias He 361433fc58eSAsias He /* No payload */ 36271dc9ec9SBobby Eshleman if (!payload_len) 36371dc9ec9SBobby Eshleman return skb; 364433fc58eSAsias He 36571dc9ec9SBobby Eshleman /* The pkt is too big or the length in the header is invalid */ 36671dc9ec9SBobby Eshleman if (payload_len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE || 36771dc9ec9SBobby Eshleman payload_len + sizeof(*hdr) > len) { 36871dc9ec9SBobby Eshleman kfree_skb(skb); 369433fc58eSAsias He return NULL; 370433fc58eSAsias He } 371433fc58eSAsias He 37271dc9ec9SBobby Eshleman virtio_vsock_skb_rx_put(skb); 37371dc9ec9SBobby Eshleman 37471dc9ec9SBobby Eshleman nbytes = copy_from_iter(skb->data, payload_len, &iov_iter); 37571dc9ec9SBobby Eshleman if (nbytes != payload_len) { 37671dc9ec9SBobby Eshleman vq_err(vq, "Expected %zu byte payload, got %zu bytes\n", 37771dc9ec9SBobby Eshleman payload_len, nbytes); 37871dc9ec9SBobby Eshleman kfree_skb(skb); 379433fc58eSAsias He return NULL; 380433fc58eSAsias He } 381433fc58eSAsias He 38271dc9ec9SBobby Eshleman return skb; 383433fc58eSAsias He } 384433fc58eSAsias He 385433fc58eSAsias He /* Is there space left for replies to rx packets? */ 386433fc58eSAsias He static bool vhost_vsock_more_replies(struct vhost_vsock *vsock) 387433fc58eSAsias He { 388433fc58eSAsias He struct vhost_virtqueue *vq = &vsock->vqs[VSOCK_VQ_TX]; 389433fc58eSAsias He int val; 390433fc58eSAsias He 391433fc58eSAsias He smp_rmb(); /* paired with atomic_inc() and atomic_dec_return() */ 392433fc58eSAsias He val = atomic_read(&vsock->queued_replies); 393433fc58eSAsias He 394433fc58eSAsias He return val < vq->num; 395433fc58eSAsias He } 396433fc58eSAsias He 397ced7b713SArseny Krasnov static bool vhost_transport_seqpacket_allow(u32 remote_cid); 398ced7b713SArseny Krasnov 3994c7246dcSStefano Garzarella static struct virtio_transport vhost_transport = { 4004c7246dcSStefano Garzarella .transport = { 4016a2c0962SStefano Garzarella .module = THIS_MODULE, 4026a2c0962SStefano Garzarella 4034c7246dcSStefano Garzarella .get_local_cid = vhost_transport_get_local_cid, 4044c7246dcSStefano Garzarella 4054c7246dcSStefano Garzarella .init = virtio_transport_do_socket_init, 4064c7246dcSStefano Garzarella .destruct = virtio_transport_destruct, 4074c7246dcSStefano Garzarella .release = virtio_transport_release, 4084c7246dcSStefano Garzarella .connect = virtio_transport_connect, 4094c7246dcSStefano Garzarella .shutdown = virtio_transport_shutdown, 4104c7246dcSStefano Garzarella .cancel_pkt = vhost_transport_cancel_pkt, 4114c7246dcSStefano Garzarella 4124c7246dcSStefano Garzarella .dgram_enqueue = virtio_transport_dgram_enqueue, 4134c7246dcSStefano Garzarella .dgram_dequeue = virtio_transport_dgram_dequeue, 4144c7246dcSStefano Garzarella .dgram_bind = virtio_transport_dgram_bind, 4154c7246dcSStefano Garzarella .dgram_allow = virtio_transport_dgram_allow, 4164c7246dcSStefano Garzarella 4174c7246dcSStefano Garzarella .stream_enqueue = virtio_transport_stream_enqueue, 4184c7246dcSStefano Garzarella .stream_dequeue = virtio_transport_stream_dequeue, 4194c7246dcSStefano Garzarella .stream_has_data = virtio_transport_stream_has_data, 4204c7246dcSStefano Garzarella .stream_has_space = virtio_transport_stream_has_space, 4214c7246dcSStefano Garzarella .stream_rcvhiwat = virtio_transport_stream_rcvhiwat, 4224c7246dcSStefano Garzarella .stream_is_active = virtio_transport_stream_is_active, 4234c7246dcSStefano Garzarella .stream_allow = virtio_transport_stream_allow, 4244c7246dcSStefano Garzarella 425ced7b713SArseny Krasnov .seqpacket_dequeue = virtio_transport_seqpacket_dequeue, 426ced7b713SArseny Krasnov .seqpacket_enqueue = virtio_transport_seqpacket_enqueue, 427ced7b713SArseny Krasnov .seqpacket_allow = vhost_transport_seqpacket_allow, 428ced7b713SArseny Krasnov .seqpacket_has_data = virtio_transport_seqpacket_has_data, 429ced7b713SArseny Krasnov 4304c7246dcSStefano Garzarella .notify_poll_in = virtio_transport_notify_poll_in, 4314c7246dcSStefano Garzarella .notify_poll_out = virtio_transport_notify_poll_out, 4324c7246dcSStefano Garzarella .notify_recv_init = virtio_transport_notify_recv_init, 4334c7246dcSStefano Garzarella .notify_recv_pre_block = virtio_transport_notify_recv_pre_block, 4344c7246dcSStefano Garzarella .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue, 4354c7246dcSStefano Garzarella .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue, 4364c7246dcSStefano Garzarella .notify_send_init = virtio_transport_notify_send_init, 4374c7246dcSStefano Garzarella .notify_send_pre_block = virtio_transport_notify_send_pre_block, 4384c7246dcSStefano Garzarella .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue, 4394c7246dcSStefano Garzarella .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue, 440b9f2b0ffSStefano Garzarella .notify_buffer_size = virtio_transport_notify_buffer_size, 4414c7246dcSStefano Garzarella 442634f1a71SBobby Eshleman .read_skb = virtio_transport_read_skb, 4434c7246dcSStefano Garzarella }, 4444c7246dcSStefano Garzarella 4454c7246dcSStefano Garzarella .send_pkt = vhost_transport_send_pkt, 4464c7246dcSStefano Garzarella }; 4474c7246dcSStefano Garzarella 448ced7b713SArseny Krasnov static bool vhost_transport_seqpacket_allow(u32 remote_cid) 449ced7b713SArseny Krasnov { 450ced7b713SArseny Krasnov struct vhost_vsock *vsock; 451ced7b713SArseny Krasnov bool seqpacket_allow = false; 452ced7b713SArseny Krasnov 453ced7b713SArseny Krasnov rcu_read_lock(); 454ced7b713SArseny Krasnov vsock = vhost_vsock_get(remote_cid); 455ced7b713SArseny Krasnov 456ced7b713SArseny Krasnov if (vsock) 457ced7b713SArseny Krasnov seqpacket_allow = vsock->seqpacket_allow; 458ced7b713SArseny Krasnov 459ced7b713SArseny Krasnov rcu_read_unlock(); 460ced7b713SArseny Krasnov 461ced7b713SArseny Krasnov return seqpacket_allow; 462ced7b713SArseny Krasnov } 463ced7b713SArseny Krasnov 464433fc58eSAsias He static void vhost_vsock_handle_tx_kick(struct vhost_work *work) 465433fc58eSAsias He { 466433fc58eSAsias He struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, 467433fc58eSAsias He poll.work); 468433fc58eSAsias He struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, 469433fc58eSAsias He dev); 470e79b431fSJason Wang int head, pkts = 0, total_len = 0; 471433fc58eSAsias He unsigned int out, in; 47271dc9ec9SBobby Eshleman struct sk_buff *skb; 473433fc58eSAsias He bool added = false; 474433fc58eSAsias He 475433fc58eSAsias He mutex_lock(&vq->mutex); 476433fc58eSAsias He 477247643f8SEugenio Pérez if (!vhost_vq_get_backend(vq)) 478433fc58eSAsias He goto out; 479433fc58eSAsias He 480e13a6915SStefano Garzarella if (!vq_meta_prefetch(vq)) 481e13a6915SStefano Garzarella goto out; 482e13a6915SStefano Garzarella 483433fc58eSAsias He vhost_disable_notify(&vsock->dev, vq); 484e79b431fSJason Wang do { 48571dc9ec9SBobby Eshleman struct virtio_vsock_hdr *hdr; 48671dc9ec9SBobby Eshleman 487433fc58eSAsias He if (!vhost_vsock_more_replies(vsock)) { 488433fc58eSAsias He /* Stop tx until the device processes already 489433fc58eSAsias He * pending replies. Leave tx virtqueue 490433fc58eSAsias He * callbacks disabled. 491433fc58eSAsias He */ 492433fc58eSAsias He goto no_more_replies; 493433fc58eSAsias He } 494433fc58eSAsias He 495433fc58eSAsias He head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), 496433fc58eSAsias He &out, &in, NULL, NULL); 497433fc58eSAsias He if (head < 0) 498433fc58eSAsias He break; 499433fc58eSAsias He 500433fc58eSAsias He if (head == vq->num) { 501433fc58eSAsias He if (unlikely(vhost_enable_notify(&vsock->dev, vq))) { 502433fc58eSAsias He vhost_disable_notify(&vsock->dev, vq); 503433fc58eSAsias He continue; 504433fc58eSAsias He } 505433fc58eSAsias He break; 506433fc58eSAsias He } 507433fc58eSAsias He 50871dc9ec9SBobby Eshleman skb = vhost_vsock_alloc_skb(vq, out, in); 50971dc9ec9SBobby Eshleman if (!skb) { 510433fc58eSAsias He vq_err(vq, "Faulted on pkt\n"); 511433fc58eSAsias He continue; 512433fc58eSAsias He } 513433fc58eSAsias He 51471dc9ec9SBobby Eshleman total_len += sizeof(*hdr) + skb->len; 5153fda5d6eSStefan Hajnoczi 51682dfb540SGerard Garcia /* Deliver to monitoring devices all received packets */ 51771dc9ec9SBobby Eshleman virtio_transport_deliver_tap_pkt(skb); 51871dc9ec9SBobby Eshleman 51971dc9ec9SBobby Eshleman hdr = virtio_vsock_hdr(skb); 52082dfb540SGerard Garcia 521433fc58eSAsias He /* Only accept correctly addressed packets */ 52271dc9ec9SBobby Eshleman if (le64_to_cpu(hdr->src_cid) == vsock->guest_cid && 52371dc9ec9SBobby Eshleman le64_to_cpu(hdr->dst_cid) == 5248a3cc29cSStefano Garzarella vhost_transport_get_local_cid()) 52571dc9ec9SBobby Eshleman virtio_transport_recv_pkt(&vhost_transport, skb); 526433fc58eSAsias He else 52771dc9ec9SBobby Eshleman kfree_skb(skb); 528433fc58eSAsias He 52949d8c5ffSStefano Garzarella vhost_add_used(vq, head, 0); 530433fc58eSAsias He added = true; 531e79b431fSJason Wang } while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len))); 532433fc58eSAsias He 533433fc58eSAsias He no_more_replies: 534433fc58eSAsias He if (added) 535433fc58eSAsias He vhost_signal(&vsock->dev, vq); 536433fc58eSAsias He 537433fc58eSAsias He out: 538433fc58eSAsias He mutex_unlock(&vq->mutex); 539433fc58eSAsias He } 540433fc58eSAsias He 541433fc58eSAsias He static void vhost_vsock_handle_rx_kick(struct vhost_work *work) 542433fc58eSAsias He { 543433fc58eSAsias He struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, 544433fc58eSAsias He poll.work); 545433fc58eSAsias He struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, 546433fc58eSAsias He dev); 547433fc58eSAsias He 548433fc58eSAsias He vhost_transport_do_send_pkt(vsock, vq); 549433fc58eSAsias He } 550433fc58eSAsias He 551433fc58eSAsias He static int vhost_vsock_start(struct vhost_vsock *vsock) 552433fc58eSAsias He { 5530516ffd8SStefan Hajnoczi struct vhost_virtqueue *vq; 554433fc58eSAsias He size_t i; 555433fc58eSAsias He int ret; 556433fc58eSAsias He 557433fc58eSAsias He mutex_lock(&vsock->dev.mutex); 558433fc58eSAsias He 559433fc58eSAsias He ret = vhost_dev_check_owner(&vsock->dev); 560433fc58eSAsias He if (ret) 561433fc58eSAsias He goto err; 562433fc58eSAsias He 563433fc58eSAsias He for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 5640516ffd8SStefan Hajnoczi vq = &vsock->vqs[i]; 565433fc58eSAsias He 566433fc58eSAsias He mutex_lock(&vq->mutex); 567433fc58eSAsias He 568433fc58eSAsias He if (!vhost_vq_access_ok(vq)) { 569433fc58eSAsias He ret = -EFAULT; 570433fc58eSAsias He goto err_vq; 571433fc58eSAsias He } 572433fc58eSAsias He 573247643f8SEugenio Pérez if (!vhost_vq_get_backend(vq)) { 574247643f8SEugenio Pérez vhost_vq_set_backend(vq, vsock); 5750516ffd8SStefan Hajnoczi ret = vhost_vq_init_access(vq); 5760516ffd8SStefan Hajnoczi if (ret) 5770516ffd8SStefan Hajnoczi goto err_vq; 578433fc58eSAsias He } 579433fc58eSAsias He 580433fc58eSAsias He mutex_unlock(&vq->mutex); 581433fc58eSAsias He } 582433fc58eSAsias He 5830b841030SJia He /* Some packets may have been queued before the device was started, 5840b841030SJia He * let's kick the send worker to send them. 5850b841030SJia He */ 586*9e09d0ecSMike Christie vhost_vq_work_queue(&vsock->vqs[VSOCK_VQ_RX], &vsock->send_pkt_work); 5870b841030SJia He 588433fc58eSAsias He mutex_unlock(&vsock->dev.mutex); 589433fc58eSAsias He return 0; 590433fc58eSAsias He 591433fc58eSAsias He err_vq: 592247643f8SEugenio Pérez vhost_vq_set_backend(vq, NULL); 5930516ffd8SStefan Hajnoczi mutex_unlock(&vq->mutex); 5940516ffd8SStefan Hajnoczi 595433fc58eSAsias He for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 5960516ffd8SStefan Hajnoczi vq = &vsock->vqs[i]; 597433fc58eSAsias He 598433fc58eSAsias He mutex_lock(&vq->mutex); 599247643f8SEugenio Pérez vhost_vq_set_backend(vq, NULL); 600433fc58eSAsias He mutex_unlock(&vq->mutex); 601433fc58eSAsias He } 602433fc58eSAsias He err: 603433fc58eSAsias He mutex_unlock(&vsock->dev.mutex); 604433fc58eSAsias He return ret; 605433fc58eSAsias He } 606433fc58eSAsias He 607a58da53fSStefano Garzarella static int vhost_vsock_stop(struct vhost_vsock *vsock, bool check_owner) 608433fc58eSAsias He { 609433fc58eSAsias He size_t i; 610a58da53fSStefano Garzarella int ret = 0; 611433fc58eSAsias He 612433fc58eSAsias He mutex_lock(&vsock->dev.mutex); 613433fc58eSAsias He 614a58da53fSStefano Garzarella if (check_owner) { 615433fc58eSAsias He ret = vhost_dev_check_owner(&vsock->dev); 616433fc58eSAsias He if (ret) 617433fc58eSAsias He goto err; 618a58da53fSStefano Garzarella } 619433fc58eSAsias He 620433fc58eSAsias He for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 621433fc58eSAsias He struct vhost_virtqueue *vq = &vsock->vqs[i]; 622433fc58eSAsias He 623433fc58eSAsias He mutex_lock(&vq->mutex); 624247643f8SEugenio Pérez vhost_vq_set_backend(vq, NULL); 625433fc58eSAsias He mutex_unlock(&vq->mutex); 626433fc58eSAsias He } 627433fc58eSAsias He 628433fc58eSAsias He err: 629433fc58eSAsias He mutex_unlock(&vsock->dev.mutex); 630433fc58eSAsias He return ret; 631433fc58eSAsias He } 632433fc58eSAsias He 633433fc58eSAsias He static void vhost_vsock_free(struct vhost_vsock *vsock) 634433fc58eSAsias He { 635b226acabSWei Yongjun kvfree(vsock); 636433fc58eSAsias He } 637433fc58eSAsias He 638433fc58eSAsias He static int vhost_vsock_dev_open(struct inode *inode, struct file *file) 639433fc58eSAsias He { 640433fc58eSAsias He struct vhost_virtqueue **vqs; 641433fc58eSAsias He struct vhost_vsock *vsock; 642433fc58eSAsias He int ret; 643433fc58eSAsias He 644433fc58eSAsias He /* This struct is large and allocation could fail, fall back to vmalloc 645433fc58eSAsias He * if there is no other way. 646433fc58eSAsias He */ 647dcda9b04SMichal Hocko vsock = kvmalloc(sizeof(*vsock), GFP_KERNEL | __GFP_RETRY_MAYFAIL); 648433fc58eSAsias He if (!vsock) 649433fc58eSAsias He return -ENOMEM; 650433fc58eSAsias He 651433fc58eSAsias He vqs = kmalloc_array(ARRAY_SIZE(vsock->vqs), sizeof(*vqs), GFP_KERNEL); 652433fc58eSAsias He if (!vqs) { 653433fc58eSAsias He ret = -ENOMEM; 654433fc58eSAsias He goto out; 655433fc58eSAsias He } 656433fc58eSAsias He 657a72b69dcSStefan Hajnoczi vsock->guest_cid = 0; /* no CID assigned yet */ 658a72b69dcSStefan Hajnoczi 659433fc58eSAsias He atomic_set(&vsock->queued_replies, 0); 660433fc58eSAsias He 661433fc58eSAsias He vqs[VSOCK_VQ_TX] = &vsock->vqs[VSOCK_VQ_TX]; 662433fc58eSAsias He vqs[VSOCK_VQ_RX] = &vsock->vqs[VSOCK_VQ_RX]; 663433fc58eSAsias He vsock->vqs[VSOCK_VQ_TX].handle_kick = vhost_vsock_handle_tx_kick; 664433fc58eSAsias He vsock->vqs[VSOCK_VQ_RX].handle_kick = vhost_vsock_handle_rx_kick; 665433fc58eSAsias He 666e82b9b07SJason Wang vhost_dev_init(&vsock->dev, vqs, ARRAY_SIZE(vsock->vqs), 667e82b9b07SJason Wang UIO_MAXIOV, VHOST_VSOCK_PKT_WEIGHT, 66801fcb1cbSJason Wang VHOST_VSOCK_WEIGHT, true, NULL); 669433fc58eSAsias He 670433fc58eSAsias He file->private_data = vsock; 67171dc9ec9SBobby Eshleman skb_queue_head_init(&vsock->send_pkt_queue); 672433fc58eSAsias He vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work); 673433fc58eSAsias He return 0; 674433fc58eSAsias He 675433fc58eSAsias He out: 676433fc58eSAsias He vhost_vsock_free(vsock); 677433fc58eSAsias He return ret; 678433fc58eSAsias He } 679433fc58eSAsias He 680433fc58eSAsias He static void vhost_vsock_flush(struct vhost_vsock *vsock) 681433fc58eSAsias He { 682b2ffa407SMike Christie vhost_dev_flush(&vsock->dev); 683433fc58eSAsias He } 684433fc58eSAsias He 685433fc58eSAsias He static void vhost_vsock_reset_orphans(struct sock *sk) 686433fc58eSAsias He { 687433fc58eSAsias He struct vsock_sock *vsk = vsock_sk(sk); 688433fc58eSAsias He 689433fc58eSAsias He /* vmci_transport.c doesn't take sk_lock here either. At least we're 690433fc58eSAsias He * under vsock_table_lock so the sock cannot disappear while we're 691433fc58eSAsias He * executing. 692433fc58eSAsias He */ 693433fc58eSAsias He 694c38f57daSStefan Hajnoczi /* If the peer is still valid, no need to reset connection */ 695c38f57daSStefan Hajnoczi if (vhost_vsock_get(vsk->remote_addr.svm_cid)) 696c38f57daSStefan Hajnoczi return; 697c38f57daSStefan Hajnoczi 698c38f57daSStefan Hajnoczi /* If the close timeout is pending, let it expire. This avoids races 699c38f57daSStefan Hajnoczi * with the timeout callback. 700c38f57daSStefan Hajnoczi */ 701c38f57daSStefan Hajnoczi if (vsk->close_work_scheduled) 702c38f57daSStefan Hajnoczi return; 703c38f57daSStefan Hajnoczi 704433fc58eSAsias He sock_set_flag(sk, SOCK_DONE); 705433fc58eSAsias He vsk->peer_shutdown = SHUTDOWN_MASK; 706433fc58eSAsias He sk->sk_state = SS_UNCONNECTED; 707433fc58eSAsias He sk->sk_err = ECONNRESET; 708e3ae2365SAlexander Aring sk_error_report(sk); 709433fc58eSAsias He } 710433fc58eSAsias He 711433fc58eSAsias He static int vhost_vsock_dev_release(struct inode *inode, struct file *file) 712433fc58eSAsias He { 713433fc58eSAsias He struct vhost_vsock *vsock = file->private_data; 714433fc58eSAsias He 7156db3d8dcSStefan Hajnoczi mutex_lock(&vhost_vsock_mutex); 716834e772cSStefan Hajnoczi if (vsock->guest_cid) 717834e772cSStefan Hajnoczi hash_del_rcu(&vsock->hash); 7186db3d8dcSStefan Hajnoczi mutex_unlock(&vhost_vsock_mutex); 719433fc58eSAsias He 720834e772cSStefan Hajnoczi /* Wait for other CPUs to finish using vsock */ 721834e772cSStefan Hajnoczi synchronize_rcu(); 722834e772cSStefan Hajnoczi 723433fc58eSAsias He /* Iterating over all connections for all CIDs to find orphans is 724433fc58eSAsias He * inefficient. Room for improvement here. */ 7258e6ed963SJiyong Park vsock_for_each_connected_socket(&vhost_transport.transport, 7268e6ed963SJiyong Park vhost_vsock_reset_orphans); 727433fc58eSAsias He 728a58da53fSStefano Garzarella /* Don't check the owner, because we are in the release path, so we 729a58da53fSStefano Garzarella * need to stop the vsock device in any case. 730a58da53fSStefano Garzarella * vhost_vsock_stop() can not fail in this case, so we don't need to 731a58da53fSStefano Garzarella * check the return code. 732a58da53fSStefano Garzarella */ 733a58da53fSStefano Garzarella vhost_vsock_stop(vsock, false); 734433fc58eSAsias He vhost_vsock_flush(vsock); 735433fc58eSAsias He vhost_dev_stop(&vsock->dev); 736433fc58eSAsias He 73771dc9ec9SBobby Eshleman virtio_vsock_skb_queue_purge(&vsock->send_pkt_queue); 738433fc58eSAsias He 739f6f93f75S夷则(Caspar) vhost_dev_cleanup(&vsock->dev); 740433fc58eSAsias He kfree(vsock->dev.vqs); 741433fc58eSAsias He vhost_vsock_free(vsock); 742433fc58eSAsias He return 0; 743433fc58eSAsias He } 744433fc58eSAsias He 745433fc58eSAsias He static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid) 746433fc58eSAsias He { 747433fc58eSAsias He struct vhost_vsock *other; 748433fc58eSAsias He 749433fc58eSAsias He /* Refuse reserved CIDs */ 750433fc58eSAsias He if (guest_cid <= VMADDR_CID_HOST || 751433fc58eSAsias He guest_cid == U32_MAX) 752433fc58eSAsias He return -EINVAL; 753433fc58eSAsias He 754433fc58eSAsias He /* 64-bit CIDs are not yet supported */ 755433fc58eSAsias He if (guest_cid > U32_MAX) 756433fc58eSAsias He return -EINVAL; 757433fc58eSAsias He 758ed8640a9SStefano Garzarella /* Refuse if CID is assigned to the guest->host transport (i.e. nested 759ed8640a9SStefano Garzarella * VM), to make the loopback work. 760ed8640a9SStefano Garzarella */ 761ed8640a9SStefano Garzarella if (vsock_find_cid(guest_cid)) 762ed8640a9SStefano Garzarella return -EADDRINUSE; 763ed8640a9SStefano Garzarella 764433fc58eSAsias He /* Refuse if CID is already in use */ 7656db3d8dcSStefan Hajnoczi mutex_lock(&vhost_vsock_mutex); 766834e772cSStefan Hajnoczi other = vhost_vsock_get(guest_cid); 7676c083c2bSGao feng if (other && other != vsock) { 7686db3d8dcSStefan Hajnoczi mutex_unlock(&vhost_vsock_mutex); 7696c083c2bSGao feng return -EADDRINUSE; 7706c083c2bSGao feng } 771834e772cSStefan Hajnoczi 772834e772cSStefan Hajnoczi if (vsock->guest_cid) 773834e772cSStefan Hajnoczi hash_del_rcu(&vsock->hash); 774834e772cSStefan Hajnoczi 775433fc58eSAsias He vsock->guest_cid = guest_cid; 7767fbe078cSZha Bin hash_add_rcu(vhost_vsock_hash, &vsock->hash, vsock->guest_cid); 7776db3d8dcSStefan Hajnoczi mutex_unlock(&vhost_vsock_mutex); 778433fc58eSAsias He 779433fc58eSAsias He return 0; 780433fc58eSAsias He } 781433fc58eSAsias He 782433fc58eSAsias He static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features) 783433fc58eSAsias He { 784433fc58eSAsias He struct vhost_virtqueue *vq; 785433fc58eSAsias He int i; 786433fc58eSAsias He 787433fc58eSAsias He if (features & ~VHOST_VSOCK_FEATURES) 788433fc58eSAsias He return -EOPNOTSUPP; 789433fc58eSAsias He 790433fc58eSAsias He mutex_lock(&vsock->dev.mutex); 791433fc58eSAsias He if ((features & (1 << VHOST_F_LOG_ALL)) && 792433fc58eSAsias He !vhost_log_access_ok(&vsock->dev)) { 793e13a6915SStefano Garzarella goto err; 794e13a6915SStefano Garzarella } 795e13a6915SStefano Garzarella 796e13a6915SStefano Garzarella if ((features & (1ULL << VIRTIO_F_ACCESS_PLATFORM))) { 797759aba1eSLiming Wu if (vhost_init_device_iotlb(&vsock->dev)) 798e13a6915SStefano Garzarella goto err; 799433fc58eSAsias He } 800433fc58eSAsias He 801ced7b713SArseny Krasnov if (features & (1ULL << VIRTIO_VSOCK_F_SEQPACKET)) 802ced7b713SArseny Krasnov vsock->seqpacket_allow = true; 803ced7b713SArseny Krasnov 804433fc58eSAsias He for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 805433fc58eSAsias He vq = &vsock->vqs[i]; 806433fc58eSAsias He mutex_lock(&vq->mutex); 807433fc58eSAsias He vq->acked_features = features; 808433fc58eSAsias He mutex_unlock(&vq->mutex); 809433fc58eSAsias He } 810433fc58eSAsias He mutex_unlock(&vsock->dev.mutex); 811433fc58eSAsias He return 0; 812e13a6915SStefano Garzarella 813e13a6915SStefano Garzarella err: 814e13a6915SStefano Garzarella mutex_unlock(&vsock->dev.mutex); 815e13a6915SStefano Garzarella return -EFAULT; 816433fc58eSAsias He } 817433fc58eSAsias He 818433fc58eSAsias He static long vhost_vsock_dev_ioctl(struct file *f, unsigned int ioctl, 819433fc58eSAsias He unsigned long arg) 820433fc58eSAsias He { 821433fc58eSAsias He struct vhost_vsock *vsock = f->private_data; 822433fc58eSAsias He void __user *argp = (void __user *)arg; 823433fc58eSAsias He u64 guest_cid; 824433fc58eSAsias He u64 features; 825433fc58eSAsias He int start; 826433fc58eSAsias He int r; 827433fc58eSAsias He 828433fc58eSAsias He switch (ioctl) { 829433fc58eSAsias He case VHOST_VSOCK_SET_GUEST_CID: 830433fc58eSAsias He if (copy_from_user(&guest_cid, argp, sizeof(guest_cid))) 831433fc58eSAsias He return -EFAULT; 832433fc58eSAsias He return vhost_vsock_set_cid(vsock, guest_cid); 833433fc58eSAsias He case VHOST_VSOCK_SET_RUNNING: 834433fc58eSAsias He if (copy_from_user(&start, argp, sizeof(start))) 835433fc58eSAsias He return -EFAULT; 836433fc58eSAsias He if (start) 837433fc58eSAsias He return vhost_vsock_start(vsock); 838433fc58eSAsias He else 839a58da53fSStefano Garzarella return vhost_vsock_stop(vsock, true); 840433fc58eSAsias He case VHOST_GET_FEATURES: 841433fc58eSAsias He features = VHOST_VSOCK_FEATURES; 842433fc58eSAsias He if (copy_to_user(argp, &features, sizeof(features))) 843433fc58eSAsias He return -EFAULT; 844433fc58eSAsias He return 0; 845433fc58eSAsias He case VHOST_SET_FEATURES: 846433fc58eSAsias He if (copy_from_user(&features, argp, sizeof(features))) 847433fc58eSAsias He return -EFAULT; 848433fc58eSAsias He return vhost_vsock_set_features(vsock, features); 849e13a6915SStefano Garzarella case VHOST_GET_BACKEND_FEATURES: 850e13a6915SStefano Garzarella features = VHOST_VSOCK_BACKEND_FEATURES; 851e13a6915SStefano Garzarella if (copy_to_user(argp, &features, sizeof(features))) 852e13a6915SStefano Garzarella return -EFAULT; 853e13a6915SStefano Garzarella return 0; 854e13a6915SStefano Garzarella case VHOST_SET_BACKEND_FEATURES: 855e13a6915SStefano Garzarella if (copy_from_user(&features, argp, sizeof(features))) 856e13a6915SStefano Garzarella return -EFAULT; 857e13a6915SStefano Garzarella if (features & ~VHOST_VSOCK_BACKEND_FEATURES) 858e13a6915SStefano Garzarella return -EOPNOTSUPP; 859e13a6915SStefano Garzarella vhost_set_backend_features(&vsock->dev, features); 860e13a6915SStefano Garzarella return 0; 861433fc58eSAsias He default: 862433fc58eSAsias He mutex_lock(&vsock->dev.mutex); 863433fc58eSAsias He r = vhost_dev_ioctl(&vsock->dev, ioctl, argp); 864433fc58eSAsias He if (r == -ENOIOCTLCMD) 865433fc58eSAsias He r = vhost_vring_ioctl(&vsock->dev, ioctl, argp); 866433fc58eSAsias He else 867433fc58eSAsias He vhost_vsock_flush(vsock); 868433fc58eSAsias He mutex_unlock(&vsock->dev.mutex); 869433fc58eSAsias He return r; 870433fc58eSAsias He } 871433fc58eSAsias He } 872433fc58eSAsias He 873e13a6915SStefano Garzarella static ssize_t vhost_vsock_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) 874e13a6915SStefano Garzarella { 875e13a6915SStefano Garzarella struct file *file = iocb->ki_filp; 876e13a6915SStefano Garzarella struct vhost_vsock *vsock = file->private_data; 877e13a6915SStefano Garzarella struct vhost_dev *dev = &vsock->dev; 878e13a6915SStefano Garzarella int noblock = file->f_flags & O_NONBLOCK; 879e13a6915SStefano Garzarella 880e13a6915SStefano Garzarella return vhost_chr_read_iter(dev, to, noblock); 881e13a6915SStefano Garzarella } 882e13a6915SStefano Garzarella 883e13a6915SStefano Garzarella static ssize_t vhost_vsock_chr_write_iter(struct kiocb *iocb, 884e13a6915SStefano Garzarella struct iov_iter *from) 885e13a6915SStefano Garzarella { 886e13a6915SStefano Garzarella struct file *file = iocb->ki_filp; 887e13a6915SStefano Garzarella struct vhost_vsock *vsock = file->private_data; 888e13a6915SStefano Garzarella struct vhost_dev *dev = &vsock->dev; 889e13a6915SStefano Garzarella 890e13a6915SStefano Garzarella return vhost_chr_write_iter(dev, from); 891e13a6915SStefano Garzarella } 892e13a6915SStefano Garzarella 893e13a6915SStefano Garzarella static __poll_t vhost_vsock_chr_poll(struct file *file, poll_table *wait) 894e13a6915SStefano Garzarella { 895e13a6915SStefano Garzarella struct vhost_vsock *vsock = file->private_data; 896e13a6915SStefano Garzarella struct vhost_dev *dev = &vsock->dev; 897e13a6915SStefano Garzarella 898e13a6915SStefano Garzarella return vhost_chr_poll(file, dev, wait); 899e13a6915SStefano Garzarella } 900e13a6915SStefano Garzarella 901433fc58eSAsias He static const struct file_operations vhost_vsock_fops = { 902433fc58eSAsias He .owner = THIS_MODULE, 903433fc58eSAsias He .open = vhost_vsock_dev_open, 904433fc58eSAsias He .release = vhost_vsock_dev_release, 905433fc58eSAsias He .llseek = noop_llseek, 906433fc58eSAsias He .unlocked_ioctl = vhost_vsock_dev_ioctl, 907407e9ef7SArnd Bergmann .compat_ioctl = compat_ptr_ioctl, 908e13a6915SStefano Garzarella .read_iter = vhost_vsock_chr_read_iter, 909e13a6915SStefano Garzarella .write_iter = vhost_vsock_chr_write_iter, 910e13a6915SStefano Garzarella .poll = vhost_vsock_chr_poll, 911433fc58eSAsias He }; 912433fc58eSAsias He 913433fc58eSAsias He static struct miscdevice vhost_vsock_misc = { 914f4660cc9SStefan Hajnoczi .minor = VHOST_VSOCK_MINOR, 915433fc58eSAsias He .name = "vhost-vsock", 916433fc58eSAsias He .fops = &vhost_vsock_fops, 917433fc58eSAsias He }; 918433fc58eSAsias He 919433fc58eSAsias He static int __init vhost_vsock_init(void) 920433fc58eSAsias He { 921433fc58eSAsias He int ret; 922433fc58eSAsias He 923c0cfa2d8SStefano Garzarella ret = vsock_core_register(&vhost_transport.transport, 924c0cfa2d8SStefano Garzarella VSOCK_TRANSPORT_F_H2G); 925433fc58eSAsias He if (ret < 0) 926433fc58eSAsias He return ret; 9277a4efe18SYuan Can 9287a4efe18SYuan Can ret = misc_register(&vhost_vsock_misc); 9297a4efe18SYuan Can if (ret) { 9307a4efe18SYuan Can vsock_core_unregister(&vhost_transport.transport); 9317a4efe18SYuan Can return ret; 9327a4efe18SYuan Can } 9337a4efe18SYuan Can 9347a4efe18SYuan Can return 0; 935433fc58eSAsias He }; 936433fc58eSAsias He 937433fc58eSAsias He static void __exit vhost_vsock_exit(void) 938433fc58eSAsias He { 939433fc58eSAsias He misc_deregister(&vhost_vsock_misc); 940c0cfa2d8SStefano Garzarella vsock_core_unregister(&vhost_transport.transport); 941433fc58eSAsias He }; 942433fc58eSAsias He 943433fc58eSAsias He module_init(vhost_vsock_init); 944433fc58eSAsias He module_exit(vhost_vsock_exit); 945433fc58eSAsias He MODULE_LICENSE("GPL v2"); 946433fc58eSAsias He MODULE_AUTHOR("Asias He"); 947433fc58eSAsias He MODULE_DESCRIPTION("vhost transport for vsock "); 948f4660cc9SStefan Hajnoczi MODULE_ALIAS_MISCDEV(VHOST_VSOCK_MINOR); 949f4660cc9SStefan Hajnoczi MODULE_ALIAS("devname:vhost-vsock"); 950