[PATCH V2 2/3] vhost: introduce vhost_vq_more_avail()
From: Jason Wang <jasowang@redhat.com>
Date: 2015-12-01 06:40:13
Also in:
kvm, lkml
Subsystem:
the rest, virtio host (vhost) · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang
Signed-off-by: Jason Wang <jasowang@redhat.com> --- drivers/vhost/vhost.c | 13 +++++++++++++ drivers/vhost/vhost.h | 1 + 2 files changed, 14 insertions(+)
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 163b365..4f45a03 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c@@ -1633,6 +1633,19 @@ void vhost_add_used_and_signal_n(struct vhost_dev *dev, } EXPORT_SYMBOL_GPL(vhost_add_used_and_signal_n); +bool vhost_vq_more_avail(struct vhost_dev *dev, struct vhost_virtqueue *vq) +{ + __virtio16 avail_idx; + int r; + + r = __get_user(avail_idx, &vq->avail->idx); + if (r) + return false; + + return vhost16_to_cpu(vq, avail_idx) != vq->avail_idx; +} +EXPORT_SYMBOL_GPL(vhost_vq_more_avail); + /* OK, now we need to know about added descriptors. */ bool vhost_enable_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq) {
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index 43284ad..2f3c57c 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h@@ -159,6 +159,7 @@ void vhost_add_used_and_signal_n(struct vhost_dev *, struct vhost_virtqueue *, struct vring_used_elem *heads, unsigned count); void vhost_signal(struct vhost_dev *, struct vhost_virtqueue *); void vhost_disable_notify(struct vhost_dev *, struct vhost_virtqueue *); +bool vhost_vq_more_avail(struct vhost_dev *, struct vhost_virtqueue *); bool vhost_enable_notify(struct vhost_dev *, struct vhost_virtqueue *); int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log,
--
2.5.0