59 lines
1.9 KiB
Diff
59 lines
1.9 KiB
Diff
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
|
|
|