diff options
Diffstat (limited to 'hw/virtio/virtio.c')
| -rw-r--r-- | hw/virtio/virtio.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 7504f8b33a..d0bc72e0e4 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -244,14 +244,12 @@ int virtio_queue_empty(VirtQueue *vq) return vring_avail_idx(vq) == vq->last_avail_idx; } -void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, - unsigned int len, unsigned int idx) +static void virtqueue_unmap_sg(VirtQueue *vq, const VirtQueueElement *elem, + unsigned int len) { unsigned int offset; int i; - trace_virtqueue_fill(vq, elem, len, idx); - offset = 0; for (i = 0; i < elem->in_num; i++) { size_t size = MIN(len - offset, elem->in_sg[i].iov_len); @@ -267,6 +265,21 @@ void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, cpu_physical_memory_unmap(elem->out_sg[i].iov_base, elem->out_sg[i].iov_len, 0, elem->out_sg[i].iov_len); +} + +void virtqueue_discard(VirtQueue *vq, const VirtQueueElement *elem, + unsigned int len) +{ + vq->last_avail_idx--; + virtqueue_unmap_sg(vq, elem, len); +} + +void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, + unsigned int len, unsigned int idx) +{ + trace_virtqueue_fill(vq, elem, len, idx); + + virtqueue_unmap_sg(vq, elem, len); idx = (idx + vring_used_idx(vq)) % vq->vring.num; |