diff options
Diffstat (limited to 'drivers/vhost/vhost.c')
| -rw-r--r-- | drivers/vhost/vhost.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 97be299f0a8d..484818796978 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -2050,7 +2050,7 @@ static int translate_desc(struct vhost_virtqueue *vq, u64 addr, u32 len, struct vhost_dev *dev = vq->dev; struct vhost_umem *umem = dev->iotlb ? dev->iotlb : dev->umem; struct iovec *_iov; - u64 s = 0; + u64 s = 0, last = addr + len - 1; int ret = 0; while ((u64)len > s) { @@ -2061,7 +2061,7 @@ static int translate_desc(struct vhost_virtqueue *vq, u64 addr, u32 len, } node = vhost_umem_interval_tree_iter_first(&umem->umem_tree, - addr, addr + len - 1); + addr, last); if (node == NULL || node->start > addr) { if (umem != dev->iotlb) { ret = -EFAULT; @@ -2519,9 +2519,19 @@ bool vhost_vq_avail_empty(struct vhost_dev *dev, struct vhost_virtqueue *vq) r = vhost_get_avail_idx(vq, &avail_idx); if (unlikely(r)) return false; + vq->avail_idx = vhost16_to_cpu(vq, avail_idx); + if (vq->avail_idx != vq->last_avail_idx) { + /* Since we have updated avail_idx, the following + * call to vhost_get_vq_desc() will read available + * ring entries. Make sure that read happens after + * the avail_idx read. + */ + smp_rmb(); + return false; + } - return vq->avail_idx == vq->last_avail_idx; + return true; } EXPORT_SYMBOL_GPL(vhost_vq_avail_empty); @@ -2583,12 +2593,11 @@ EXPORT_SYMBOL_GPL(vhost_disable_notify); /* Create a new message. */ struct vhost_msg_node *vhost_new_msg(struct vhost_virtqueue *vq, int type) { - struct vhost_msg_node *node = kmalloc(sizeof *node, GFP_KERNEL); + /* Make sure all padding within the structure is initialized. */ + struct vhost_msg_node *node = kzalloc(sizeof(*node), GFP_KERNEL); if (!node) return NULL; - /* Make sure all padding within the structure is initialized. */ - memset(&node->msg, 0, sizeof node->msg); node->vq = vq; node->msg.type = type; return node; |