| https://bugs.gentoo.org/560760 |
| |
| From ce317461573bac12b10d67699b4ddf1f97cf066c Mon Sep 17 00:00:00 2001 |
| From: Jason Wang <jasowang@redhat.com> |
| Date: Fri, 25 Sep 2015 13:21:28 +0800 |
| Subject: [PATCH 1/3] virtio: introduce virtqueue_unmap_sg() |
| |
| Factor out sg unmapping logic. This will be reused by the patch that |
| can discard descriptor. |
| |
| Cc: Michael S. Tsirkin <mst@redhat.com> |
| Cc: Andrew James <andrew.james@hpe.com> |
| Signed-off-by: Jason Wang <jasowang@redhat.com> |
| Reviewed-by: Michael S. Tsirkin <mst@redhat.com> |
| Signed-off-by: Michael S. Tsirkin <mst@redhat.com> |
| --- |
| hw/virtio/virtio.c | 14 ++++++++++---- |
| 1 file changed, 10 insertions(+), 4 deletions(-) |
| |
| diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c |
| index 7504f8b..6f2b96c 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 +265,14 @@ 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_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; |
| |
| -- |
| 2.6.0.rc2.230.g3dd15c0 |
| |