From: Jason Wang <jasowang@redhat.com>
To: mst@redhat.com, kvm@vger.kernel.org,
virtualization@lists.linux-foundation.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Jason Wang <jasowang@redhat.com>
Subject: [PATCH V2 2/3] vhost: introduce vhost_vq_more_avail()
Date: Tue, 1 Dec 2015 14:39:44 +0800 [thread overview]
Message-ID: <1448951985-12385-3-git-send-email-jasowang@redhat.com> (raw)
In-Reply-To: <1448951985-12385-1-git-send-email-jasowang@redhat.com>
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
next prev parent reply other threads:[~2015-12-01 6:40 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-01 6:39 [PATCH V2 0/3] basic busy polling support for vhost_net Jason Wang
2015-12-01 6:39 ` [PATCH V2 1/3] vhost: introduce vhost_has_work() Jason Wang
2015-12-01 6:39 ` Jason Wang [this message]
2016-01-20 14:09 ` [PATCH V2 2/3] vhost: introduce vhost_vq_more_avail() Michael S. Tsirkin
2016-01-22 5:43 ` Jason Wang
2015-12-01 6:39 ` [PATCH V2 3/3] vhost_net: basic polling support Jason Wang
2016-01-20 14:35 ` Michael S. Tsirkin
2016-01-21 2:11 ` Yang Zhang
2016-01-21 5:13 ` Michael S. Tsirkin
2016-01-21 6:39 ` Yang Zhang
2016-01-22 5:59 ` Jason Wang
2016-01-24 9:00 ` [PATCH V2 0/3] basic busy polling support for vhost_net Mike Rapoport
2016-01-25 3:00 ` Jason Wang
[not found] ` <OF39FCBD95.AC4D3DD2-ONC2257F45.002772D2-C2257F45.002BD839@il.ibm.com>
2016-01-25 8:41 ` Jason Wang
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