From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755204AbbLAGkN (ORCPT ); Tue, 1 Dec 2015 01:40:13 -0500 Received: from mx1.redhat.com ([209.132.183.28]:44827 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755071AbbLAGkJ (ORCPT ); Tue, 1 Dec 2015 01:40:09 -0500 From: Jason Wang 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 Subject: [PATCH V2 2/3] vhost: introduce vhost_vq_more_avail() Date: Tue, 1 Dec 2015 14:39:44 +0800 Message-Id: <1448951985-12385-3-git-send-email-jasowang@redhat.com> In-Reply-To: <1448951985-12385-1-git-send-email-jasowang@redhat.com> References: <1448951985-12385-1-git-send-email-jasowang@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Jason Wang --- 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