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Date: Tue, 8 Dec 2015 19:57:33 +0800
From: Stefan Hajnoczi <stefanha@...hat.com>
To: netdev@...r.kernel.org
Cc: Matt Benjamin <mbenjamin@...hat.com>,
"David S. Miller" <davem@...emloft.net>, kvm@...r.kernel.org,
Christoffer Dall <christoffer.dall@...aro.org>,
"Michael S. Tsirkin" <mst@...hat.com>,
virtualization@...ts.linux-foundation.org, matt.ma@...aro.org,
Stefan Hajnoczi <stefanha@...hat.com>
Subject: [PATCH 3/6] Revert "VSOCK: Introduce vhost-vsock.ko"
This reverts commit 98bb892821c1ad3781b8c7daec2fc8a8de3390c9.
Keep virtio-vsock out-of-tree until the device specification is
finalized.
Signed-off-by: Stefan Hajnoczi <stefanha@...hat.com>
---
drivers/vhost/vsock.c | 631 --------------------------------------------------
drivers/vhost/vsock.h | 4 -
2 files changed, 635 deletions(-)
delete mode 100644 drivers/vhost/vsock.c
delete mode 100644 drivers/vhost/vsock.h
diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
deleted file mode 100644
index 65b1cf8..0000000
--- a/drivers/vhost/vsock.c
+++ /dev/null
@@ -1,631 +0,0 @@
-/*
- * vhost transport for vsock
- *
- * Copyright (C) 2013-2015 Red Hat, Inc.
- * Author: Asias He <asias@...hat.com>
- * Stefan Hajnoczi <stefanha@...hat.com>
- *
- * This work is licensed under the terms of the GNU GPL, version 2.
- */
-#include <linux/miscdevice.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <net/sock.h>
-#include <linux/virtio_vsock.h>
-#include <linux/vhost.h>
-
-#include <net/af_vsock.h>
-#include "vhost.h"
-#include "vsock.h"
-
-#define VHOST_VSOCK_DEFAULT_HOST_CID 2
-
-static int vhost_transport_socket_init(struct vsock_sock *vsk,
- struct vsock_sock *psk);
-
-enum {
- VHOST_VSOCK_FEATURES = VHOST_FEATURES,
-};
-
-/* Used to track all the vhost_vsock instances on the system. */
-static LIST_HEAD(vhost_vsock_list);
-static DEFINE_MUTEX(vhost_vsock_mutex);
-
-struct vhost_vsock_virtqueue {
- struct vhost_virtqueue vq;
-};
-
-struct vhost_vsock {
- /* Vhost device */
- struct vhost_dev dev;
- /* Vhost vsock virtqueue*/
- struct vhost_vsock_virtqueue vqs[VSOCK_VQ_MAX];
- /* Link to global vhost_vsock_list*/
- struct list_head list;
- /* Head for pkt from host to guest */
- struct list_head send_pkt_list;
- /* Work item to send pkt */
- struct vhost_work send_pkt_work;
- /* Wait queue for send pkt */
- wait_queue_head_t queue_wait;
- /* Used for global tx buf limitation */
- u32 total_tx_buf;
- /* Guest contex id this vhost_vsock instance handles */
- u32 guest_cid;
-};
-
-static u32 vhost_transport_get_local_cid(void)
-{
- u32 cid = VHOST_VSOCK_DEFAULT_HOST_CID;
- return cid;
-}
-
-static struct vhost_vsock *vhost_vsock_get(u32 guest_cid)
-{
- struct vhost_vsock *vsock;
-
- mutex_lock(&vhost_vsock_mutex);
- list_for_each_entry(vsock, &vhost_vsock_list, list) {
- if (vsock->guest_cid == guest_cid) {
- mutex_unlock(&vhost_vsock_mutex);
- return vsock;
- }
- }
- mutex_unlock(&vhost_vsock_mutex);
-
- return NULL;
-}
-
-static void
-vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
- struct vhost_virtqueue *vq)
-{
- bool added = false;
-
- mutex_lock(&vq->mutex);
- vhost_disable_notify(&vsock->dev, vq);
- for (;;) {
- struct virtio_vsock_pkt *pkt;
- struct iov_iter iov_iter;
- unsigned out, in;
- struct sock *sk;
- size_t nbytes;
- size_t len;
- int head;
-
- if (list_empty(&vsock->send_pkt_list)) {
- vhost_enable_notify(&vsock->dev, vq);
- break;
- }
-
- head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
- &out, &in, NULL, NULL);
- pr_debug("%s: head = %d\n", __func__, head);
- if (head < 0)
- break;
-
- if (head == vq->num) {
- if (unlikely(vhost_enable_notify(&vsock->dev, vq))) {
- vhost_disable_notify(&vsock->dev, vq);
- continue;
- }
- break;
- }
-
- pkt = list_first_entry(&vsock->send_pkt_list,
- struct virtio_vsock_pkt, list);
- list_del_init(&pkt->list);
-
- if (out) {
- virtio_transport_free_pkt(pkt);
- vq_err(vq, "Expected 0 output buffers, got %u\n", out);
- break;
- }
-
- len = iov_length(&vq->iov[out], in);
- iov_iter_init(&iov_iter, READ, &vq->iov[out], in, len);
-
- nbytes = copy_to_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter);
- if (nbytes != sizeof(pkt->hdr)) {
- virtio_transport_free_pkt(pkt);
- vq_err(vq, "Faulted on copying pkt hdr\n");
- break;
- }
-
- nbytes = copy_to_iter(pkt->buf, pkt->len, &iov_iter);
- if (nbytes != pkt->len) {
- virtio_transport_free_pkt(pkt);
- vq_err(vq, "Faulted on copying pkt buf\n");
- break;
- }
-
- vhost_add_used(vq, head, pkt->len); /* TODO should this be sizeof(pkt->hdr) + pkt->len? */
- added = true;
-
- virtio_transport_dec_tx_pkt(pkt);
- vsock->total_tx_buf -= pkt->len;
-
- sk = sk_vsock(pkt->trans->vsk);
- /* Release refcnt taken in vhost_transport_send_pkt */
- sock_put(sk);
-
- virtio_transport_free_pkt(pkt);
- }
- if (added)
- vhost_signal(&vsock->dev, vq);
- mutex_unlock(&vq->mutex);
-
- if (added)
- wake_up(&vsock->queue_wait);
-}
-
-static void vhost_transport_send_pkt_work(struct vhost_work *work)
-{
- struct vhost_virtqueue *vq;
- struct vhost_vsock *vsock;
-
- vsock = container_of(work, struct vhost_vsock, send_pkt_work);
- vq = &vsock->vqs[VSOCK_VQ_RX].vq;
-
- vhost_transport_do_send_pkt(vsock, vq);
-}
-
-static int
-vhost_transport_send_pkt(struct vsock_sock *vsk,
- struct virtio_vsock_pkt_info *info)
-{
- u32 src_cid, src_port, dst_cid, dst_port;
- struct virtio_transport *trans;
- struct virtio_vsock_pkt *pkt;
- struct vhost_virtqueue *vq;
- struct vhost_vsock *vsock;
- u32 pkt_len = info->pkt_len;
- DEFINE_WAIT(wait);
-
- src_cid = vhost_transport_get_local_cid();
- src_port = vsk->local_addr.svm_port;
- if (!info->remote_cid) {
- dst_cid = vsk->remote_addr.svm_cid;
- dst_port = vsk->remote_addr.svm_port;
- } else {
- dst_cid = info->remote_cid;
- dst_port = info->remote_port;
- }
-
- /* Find the vhost_vsock according to guest context id */
- vsock = vhost_vsock_get(dst_cid);
- if (!vsock)
- return -ENODEV;
-
- trans = vsk->trans;
- vq = &vsock->vqs[VSOCK_VQ_RX].vq;
-
- /* we can send less than pkt_len bytes */
- if (pkt_len > VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE)
- pkt_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
-
- /* virtio_transport_get_credit might return less than pkt_len credit */
- pkt_len = virtio_transport_get_credit(trans, pkt_len);
-
- /* Do not send zero length OP_RW pkt*/
- if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW)
- return pkt_len;
-
- /* Respect global tx buf limitation */
- mutex_lock(&vq->mutex);
- while (pkt_len + vsock->total_tx_buf > VIRTIO_VSOCK_MAX_TX_BUF_SIZE) {
- prepare_to_wait_exclusive(&vsock->queue_wait, &wait,
- TASK_UNINTERRUPTIBLE);
- mutex_unlock(&vq->mutex);
- schedule();
- mutex_lock(&vq->mutex);
- finish_wait(&vsock->queue_wait, &wait);
- }
- vsock->total_tx_buf += pkt_len;
- mutex_unlock(&vq->mutex);
-
- pkt = virtio_transport_alloc_pkt(vsk, info, pkt_len,
- src_cid, src_port,
- dst_cid, dst_port);
- if (!pkt) {
- mutex_lock(&vq->mutex);
- vsock->total_tx_buf -= pkt_len;
- mutex_unlock(&vq->mutex);
- virtio_transport_put_credit(trans, pkt_len);
- return -ENOMEM;
- }
-
- pr_debug("%s:info->pkt_len= %d\n", __func__, pkt_len);
- /* Released in vhost_transport_do_send_pkt */
- sock_hold(&trans->vsk->sk);
- virtio_transport_inc_tx_pkt(pkt);
-
- /* Queue it up in vhost work */
- mutex_lock(&vq->mutex);
- list_add_tail(&pkt->list, &vsock->send_pkt_list);
- vhost_work_queue(&vsock->dev, &vsock->send_pkt_work);
- mutex_unlock(&vq->mutex);
-
- return pkt_len;
-}
-
-static struct virtio_transport_pkt_ops vhost_ops = {
- .send_pkt = vhost_transport_send_pkt,
-};
-
-static struct virtio_vsock_pkt *
-vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq,
- unsigned int out, unsigned int in)
-{
- struct virtio_vsock_pkt *pkt;
- struct iov_iter iov_iter;
- size_t nbytes;
- size_t len;
-
- if (in != 0) {
- vq_err(vq, "Expected 0 input buffers, got %u\n", in);
- return NULL;
- }
-
- pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
- if (!pkt)
- return NULL;
-
- len = iov_length(vq->iov, out);
- iov_iter_init(&iov_iter, WRITE, vq->iov, out, len);
-
- nbytes = copy_from_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter);
- if (nbytes != sizeof(pkt->hdr)) {
- vq_err(vq, "Expected %zu bytes for pkt->hdr, got %zu bytes\n",
- sizeof(pkt->hdr), nbytes);
- kfree(pkt);
- return NULL;
- }
-
- if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_DGRAM)
- pkt->len = le32_to_cpu(pkt->hdr.len) & 0XFFFF;
- else if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_STREAM)
- pkt->len = le32_to_cpu(pkt->hdr.len);
-
- /* No payload */
- if (!pkt->len)
- return pkt;
-
- /* The pkt is too big */
- if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) {
- kfree(pkt);
- return NULL;
- }
-
- pkt->buf = kmalloc(pkt->len, GFP_KERNEL);
- if (!pkt->buf) {
- kfree(pkt);
- return NULL;
- }
-
- nbytes = copy_from_iter(pkt->buf, pkt->len, &iov_iter);
- if (nbytes != pkt->len) {
- vq_err(vq, "Expected %u byte payload, got %zu bytes\n",
- pkt->len, nbytes);
- virtio_transport_free_pkt(pkt);
- return NULL;
- }
-
- return pkt;
-}
-
-static void vhost_vsock_handle_ctl_kick(struct vhost_work *work)
-{
- struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
- poll.work);
- struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
- dev);
-
- pr_debug("%s vq=%p, vsock=%p\n", __func__, vq, vsock);
-}
-
-static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
-{
- struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
- poll.work);
- struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
- dev);
- struct virtio_vsock_pkt *pkt;
- int head;
- unsigned int out, in;
- bool added = false;
- u32 len;
-
- mutex_lock(&vq->mutex);
- vhost_disable_notify(&vsock->dev, vq);
- for (;;) {
- head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
- &out, &in, NULL, NULL);
- if (head < 0)
- break;
-
- if (head == vq->num) {
- if (unlikely(vhost_enable_notify(&vsock->dev, vq))) {
- vhost_disable_notify(&vsock->dev, vq);
- continue;
- }
- break;
- }
-
- pkt = vhost_vsock_alloc_pkt(vq, out, in);
- if (!pkt) {
- vq_err(vq, "Faulted on pkt\n");
- continue;
- }
-
- len = pkt->len;
-
- /* Only accept correctly addressed packets */
- if (le32_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid &&
- le32_to_cpu(pkt->hdr.dst_cid) == vhost_transport_get_local_cid())
- virtio_transport_recv_pkt(pkt);
- else
- virtio_transport_free_pkt(pkt);
-
- vhost_add_used(vq, head, len);
- added = true;
- }
- if (added)
- vhost_signal(&vsock->dev, vq);
- mutex_unlock(&vq->mutex);
-}
-
-static void vhost_vsock_handle_rx_kick(struct vhost_work *work)
-{
- struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
- poll.work);
- struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
- dev);
-
- vhost_transport_do_send_pkt(vsock, vq);
-}
-
-static int vhost_vsock_dev_open(struct inode *inode, struct file *file)
-{
- struct vhost_virtqueue **vqs;
- struct vhost_vsock *vsock;
- int ret;
-
- vsock = kzalloc(sizeof(*vsock), GFP_KERNEL);
- if (!vsock)
- return -ENOMEM;
-
- pr_debug("%s:vsock=%p\n", __func__, vsock);
-
- vqs = kmalloc(VSOCK_VQ_MAX * sizeof(*vqs), GFP_KERNEL);
- if (!vqs) {
- ret = -ENOMEM;
- goto out;
- }
-
- vqs[VSOCK_VQ_CTRL] = &vsock->vqs[VSOCK_VQ_CTRL].vq;
- vqs[VSOCK_VQ_TX] = &vsock->vqs[VSOCK_VQ_TX].vq;
- vqs[VSOCK_VQ_RX] = &vsock->vqs[VSOCK_VQ_RX].vq;
- vsock->vqs[VSOCK_VQ_CTRL].vq.handle_kick = vhost_vsock_handle_ctl_kick;
- vsock->vqs[VSOCK_VQ_TX].vq.handle_kick = vhost_vsock_handle_tx_kick;
- vsock->vqs[VSOCK_VQ_RX].vq.handle_kick = vhost_vsock_handle_rx_kick;
-
- vhost_dev_init(&vsock->dev, vqs, VSOCK_VQ_MAX);
-
- file->private_data = vsock;
- init_waitqueue_head(&vsock->queue_wait);
- INIT_LIST_HEAD(&vsock->send_pkt_list);
- vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work);
-
- mutex_lock(&vhost_vsock_mutex);
- list_add_tail(&vsock->list, &vhost_vsock_list);
- mutex_unlock(&vhost_vsock_mutex);
- return 0;
-
-out:
- kfree(vsock);
- return ret;
-}
-
-static void vhost_vsock_flush(struct vhost_vsock *vsock)
-{
- int i;
-
- for (i = 0; i < VSOCK_VQ_MAX; i++)
- vhost_poll_flush(&vsock->vqs[i].vq.poll);
- vhost_work_flush(&vsock->dev, &vsock->send_pkt_work);
-}
-
-static int vhost_vsock_dev_release(struct inode *inode, struct file *file)
-{
- struct vhost_vsock *vsock = file->private_data;
-
- mutex_lock(&vhost_vsock_mutex);
- list_del(&vsock->list);
- mutex_unlock(&vhost_vsock_mutex);
-
- vhost_dev_stop(&vsock->dev);
- vhost_vsock_flush(vsock);
- vhost_dev_cleanup(&vsock->dev, false);
- kfree(vsock->dev.vqs);
- kfree(vsock);
- return 0;
-}
-
-static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u32 guest_cid)
-{
- struct vhost_vsock *other;
-
- /* Refuse reserved CIDs */
- if (guest_cid <= VMADDR_CID_HOST) {
- return -EINVAL;
- }
-
- /* Refuse if CID is already in use */
- other = vhost_vsock_get(guest_cid);
- if (other && other != vsock) {
- return -EADDRINUSE;
- }
-
- mutex_lock(&vhost_vsock_mutex);
- vsock->guest_cid = guest_cid;
- pr_debug("%s:guest_cid=%d\n", __func__, guest_cid);
- mutex_unlock(&vhost_vsock_mutex);
-
- return 0;
-}
-
-static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features)
-{
- struct vhost_virtqueue *vq;
- int i;
-
- if (features & ~VHOST_VSOCK_FEATURES)
- return -EOPNOTSUPP;
-
- mutex_lock(&vsock->dev.mutex);
- if ((features & (1 << VHOST_F_LOG_ALL)) &&
- !vhost_log_access_ok(&vsock->dev)) {
- mutex_unlock(&vsock->dev.mutex);
- return -EFAULT;
- }
-
- for (i = 0; i < VSOCK_VQ_MAX; i++) {
- vq = &vsock->vqs[i].vq;
- mutex_lock(&vq->mutex);
- vq->acked_features = features;
- mutex_unlock(&vq->mutex);
- }
- mutex_unlock(&vsock->dev.mutex);
- return 0;
-}
-
-static long vhost_vsock_dev_ioctl(struct file *f, unsigned int ioctl,
- unsigned long arg)
-{
- struct vhost_vsock *vsock = f->private_data;
- void __user *argp = (void __user *)arg;
- u64 __user *featurep = argp;
- u32 __user *cidp = argp;
- u32 guest_cid;
- u64 features;
- int r;
-
- switch (ioctl) {
- case VHOST_VSOCK_SET_GUEST_CID:
- if (get_user(guest_cid, cidp))
- return -EFAULT;
- return vhost_vsock_set_cid(vsock, guest_cid);
- case VHOST_GET_FEATURES:
- features = VHOST_VSOCK_FEATURES;
- if (copy_to_user(featurep, &features, sizeof(features)))
- return -EFAULT;
- return 0;
- case VHOST_SET_FEATURES:
- if (copy_from_user(&features, featurep, sizeof(features)))
- return -EFAULT;
- return vhost_vsock_set_features(vsock, features);
- default:
- mutex_lock(&vsock->dev.mutex);
- r = vhost_dev_ioctl(&vsock->dev, ioctl, argp);
- if (r == -ENOIOCTLCMD)
- r = vhost_vring_ioctl(&vsock->dev, ioctl, argp);
- else
- vhost_vsock_flush(vsock);
- mutex_unlock(&vsock->dev.mutex);
- return r;
- }
-}
-
-static const struct file_operations vhost_vsock_fops = {
- .owner = THIS_MODULE,
- .open = vhost_vsock_dev_open,
- .release = vhost_vsock_dev_release,
- .llseek = noop_llseek,
- .unlocked_ioctl = vhost_vsock_dev_ioctl,
-};
-
-static struct miscdevice vhost_vsock_misc = {
- .minor = MISC_DYNAMIC_MINOR,
- .name = "vhost-vsock",
- .fops = &vhost_vsock_fops,
-};
-
-static int
-vhost_transport_socket_init(struct vsock_sock *vsk, struct vsock_sock *psk)
-{
- struct virtio_transport *trans;
- int ret;
-
- ret = virtio_transport_do_socket_init(vsk, psk);
- if (ret)
- return ret;
-
- trans = vsk->trans;
- trans->ops = &vhost_ops;
-
- return ret;
-}
-
-static struct vsock_transport vhost_transport = {
- .get_local_cid = vhost_transport_get_local_cid,
-
- .init = vhost_transport_socket_init,
- .destruct = virtio_transport_destruct,
- .release = virtio_transport_release,
- .connect = virtio_transport_connect,
- .shutdown = virtio_transport_shutdown,
-
- .dgram_enqueue = virtio_transport_dgram_enqueue,
- .dgram_dequeue = virtio_transport_dgram_dequeue,
- .dgram_bind = virtio_transport_dgram_bind,
- .dgram_allow = virtio_transport_dgram_allow,
-
- .stream_enqueue = virtio_transport_stream_enqueue,
- .stream_dequeue = virtio_transport_stream_dequeue,
- .stream_has_data = virtio_transport_stream_has_data,
- .stream_has_space = virtio_transport_stream_has_space,
- .stream_rcvhiwat = virtio_transport_stream_rcvhiwat,
- .stream_is_active = virtio_transport_stream_is_active,
- .stream_allow = virtio_transport_stream_allow,
-
- .notify_poll_in = virtio_transport_notify_poll_in,
- .notify_poll_out = virtio_transport_notify_poll_out,
- .notify_recv_init = virtio_transport_notify_recv_init,
- .notify_recv_pre_block = virtio_transport_notify_recv_pre_block,
- .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue,
- .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue,
- .notify_send_init = virtio_transport_notify_send_init,
- .notify_send_pre_block = virtio_transport_notify_send_pre_block,
- .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue,
- .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue,
-
- .set_buffer_size = virtio_transport_set_buffer_size,
- .set_min_buffer_size = virtio_transport_set_min_buffer_size,
- .set_max_buffer_size = virtio_transport_set_max_buffer_size,
- .get_buffer_size = virtio_transport_get_buffer_size,
- .get_min_buffer_size = virtio_transport_get_min_buffer_size,
- .get_max_buffer_size = virtio_transport_get_max_buffer_size,
-};
-
-static int __init vhost_vsock_init(void)
-{
- int ret;
-
- ret = vsock_core_init(&vhost_transport);
- if (ret < 0)
- return ret;
- return misc_register(&vhost_vsock_misc);
-};
-
-static void __exit vhost_vsock_exit(void)
-{
- misc_deregister(&vhost_vsock_misc);
- vsock_core_exit();
-};
-
-module_init(vhost_vsock_init);
-module_exit(vhost_vsock_exit);
-MODULE_LICENSE("GPL v2");
-MODULE_AUTHOR("Asias He");
-MODULE_DESCRIPTION("vhost transport for vsock ");
diff --git a/drivers/vhost/vsock.h b/drivers/vhost/vsock.h
deleted file mode 100644
index 0ddb107..0000000
--- a/drivers/vhost/vsock.h
+++ /dev/null
@@ -1,4 +0,0 @@
-#ifndef VHOST_VSOCK_H
-#define VHOST_VSOCK_H
-#define VHOST_VSOCK_SET_GUEST_CID _IOW(VHOST_VIRTIO, 0x60, __u32)
-#endif
--
2.5.0
--
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