diff options
Diffstat (limited to 'usr/src/cmd/bhyve/virtio.h')
| -rw-r--r-- | usr/src/cmd/bhyve/virtio.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/usr/src/cmd/bhyve/virtio.h b/usr/src/cmd/bhyve/virtio.h index a2c3362ec2..521bfac681 100644 --- a/usr/src/cmd/bhyve/virtio.h +++ b/usr/src/cmd/bhyve/virtio.h @@ -32,6 +32,7 @@ #define _VIRTIO_H_ #include <pthread_np.h> +#include <machine/atomic.h> /* * These are derived from several virtio specifications. @@ -463,6 +464,26 @@ vq_interrupt(struct virtio_softc *vs, struct vqueue_info *vq) } } +static inline void +vq_kick_enable(struct vqueue_info *vq) +{ + + vq->vq_used->vu_flags &= ~VRING_USED_F_NO_NOTIFY; + /* + * Full memory barrier to make sure the store to vu_flags + * happens before the load from va_idx, which results from + * a subsequent call to vq_has_descs(). + */ + atomic_thread_fence_seq_cst(); +} + +static inline void +vq_kick_disable(struct vqueue_info *vq) +{ + + vq->vq_used->vu_flags |= VRING_USED_F_NO_NOTIFY; +} + struct iovec; void vi_softc_linkup(struct virtio_softc *vs, struct virtio_consts *vc, void *dev_softc, struct pci_devinst *pi, |