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authorJason Wang <jasowang@redhat.com>2019-05-24 04:12:13 -0400
committerMichael S. Tsirkin <mst@redhat.com>2019-06-05 16:23:52 -0400
commit1ab5d1385af40272ca44a5cd38af7e13da6ed847 (patch)
tree266251dade0c6ed9ae0fdae4efd48354918d2608 /drivers/vhost
parentc1ea02f15ab5efb3e93fc3144d895410bf79fcf2 (diff)
downloadlinux-1ab5d1385af40272ca44a5cd38af7e13da6ed847.tar.bz2
vhost: generalize adding used elem
Use one generic vhost_copy_to_user() instead of two dedicated accessor. This will simplify the conversion to fine grain accessors. About 2% improvement of PPS were seen during vitio-user txonly test. Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/vhost.c11
1 files changed, 1 insertions, 10 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 3f3eac4bcc58..3fb58015f8b3 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -2273,16 +2273,7 @@ static int __vhost_add_used_n(struct vhost_virtqueue *vq,
start = vq->last_used_idx & (vq->num - 1);
used = vq->used->ring + start;
- if (count == 1) {
- if (vhost_put_user(vq, heads[0].id, &used->id)) {
- vq_err(vq, "Failed to write used id");
- return -EFAULT;
- }
- if (vhost_put_user(vq, heads[0].len, &used->len)) {
- vq_err(vq, "Failed to write used len");
- return -EFAULT;
- }
- } else if (vhost_copy_to_user(vq, used, heads, count * sizeof *used)) {
+ if (vhost_copy_to_user(vq, used, heads, count * sizeof *used)) {
vq_err(vq, "Failed to write used");
return -EFAULT;
}