diff options
Diffstat (limited to 'drivers/vhost/vhost.h')
| -rw-r--r-- | drivers/vhost/vhost.h | 33 |
1 files changed, 11 insertions, 22 deletions
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index 64adcf99ff3..3eda654b8f5 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -46,6 +46,8 @@ int vhost_poll_start(struct vhost_poll *poll, struct file *file); void vhost_poll_stop(struct vhost_poll *poll); void vhost_poll_flush(struct vhost_poll *poll); void vhost_poll_queue(struct vhost_poll *poll); +void vhost_work_flush(struct vhost_dev *dev, struct vhost_work *work); +long vhost_vring_ioctl(struct vhost_dev *d, int ioctl, void __user *argp); struct vhost_log { u64 addr; @@ -101,27 +103,19 @@ struct vhost_virtqueue { struct iovec iov[UIO_MAXIOV]; struct iovec *indirect; struct vring_used_elem *heads; - /* We use a kind of RCU to access private pointer. - * All readers access it from worker, which makes it possible to - * flush the vhost_work instead of synchronize_rcu. Therefore readers do - * not need to call rcu_read_lock/rcu_read_unlock: the beginning of - * vhost_work execution acts instead of rcu_read_lock() and the end of - * vhost_work execution acts instead of rcu_read_unlock(). - * Writers use virtqueue mutex. */ - void __rcu *private_data; + /* Protected by virtqueue mutex. */ + struct vhost_memory *memory; + void *private_data; + unsigned acked_features; /* Log write descriptors */ void __user *log_base; struct vhost_log *log; }; struct vhost_dev { - /* Readers use RCU to access memory table pointer - * log base pointer and features. - * Writers use mutex below.*/ - struct vhost_memory __rcu *memory; + struct vhost_memory *memory; struct mm_struct *mm; struct mutex mutex; - unsigned acked_features; struct vhost_virtqueue **vqs; int nvqs; struct file *log_file; @@ -131,7 +125,7 @@ struct vhost_dev { struct task_struct *worker; }; -long vhost_dev_init(struct vhost_dev *, struct vhost_virtqueue **vqs, int nvqs); +void vhost_dev_init(struct vhost_dev *, struct vhost_virtqueue **vqs, int nvqs); long vhost_dev_set_owner(struct vhost_dev *dev); bool vhost_dev_has_owner(struct vhost_dev *dev); long vhost_dev_check_owner(struct vhost_dev *); @@ -144,7 +138,7 @@ long vhost_vring_ioctl(struct vhost_dev *d, int ioctl, void __user *argp); int vhost_vq_access_ok(struct vhost_virtqueue *vq); int vhost_log_access_ok(struct vhost_dev *); -int vhost_get_vq_desc(struct vhost_dev *, struct vhost_virtqueue *, +int vhost_get_vq_desc(struct vhost_virtqueue *, struct iovec iov[], unsigned int iov_count, unsigned int *out_num, unsigned int *in_num, struct vhost_log *log, unsigned int *log_num); @@ -178,13 +172,8 @@ enum { (1ULL << VHOST_F_LOG_ALL), }; -static inline int vhost_has_feature(struct vhost_dev *dev, int bit) +static inline int vhost_has_feature(struct vhost_virtqueue *vq, int bit) { - unsigned acked_features; - - /* TODO: check that we are running from vhost_worker or dev mutex is - * held? */ - acked_features = rcu_dereference_index_check(dev->acked_features, 1); - return acked_features & (1 << bit); + return vq->acked_features & (1 << bit); } #endif |