From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from out30-132.freemail.mail.aliyun.com ([115.124.30.132]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oGEuB-009KzU-CN for linux-um@lists.infradead.org; Tue, 26 Jul 2022 07:23:01 +0000 From: Xuan Zhuo Subject: [PATCH v13 14/42] virtio_ring: split: introduce virtqueue_reinit_split() Date: Tue, 26 Jul 2022 15:21:57 +0800 Message-Id: <20220726072225.19884-15-xuanzhuo@linux.alibaba.com> In-Reply-To: <20220726072225.19884-1-xuanzhuo@linux.alibaba.com> References: <20220726072225.19884-1-xuanzhuo@linux.alibaba.com> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-um" Errors-To: linux-um-bounces+geert=linux-m68k.org@lists.infradead.org To: virtualization@lists.linux-foundation.org Cc: Richard Weinberger , Anton Ivanov , Johannes Berg , "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Hans de Goede , Mark Gross , Vadim Pasternak , Bjorn Andersson , Mathieu Poirier , Cornelia Huck , Halil Pasic , Eric Farman , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Xuan Zhuo , Vincent Whitchurch , linux-um@lists.infradead.org, netdev@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, bpf@vger.kernel.org, kangjie.xu@linux.alibaba.com Introduce a function to initialize vq without allocating new ring, desc_state, desc_extra. Subsequent patches will call this function after reset vq to reinitialize vq. Signed-off-by: Xuan Zhuo Acked-by: Jason Wang --- drivers/virtio/virtio_ring.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 2067818f7047..aa5dda96824e 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -967,6 +967,25 @@ static void virtqueue_vring_init_split(struct vring_virtqueue_split *vring_split } } +static void virtqueue_reinit_split(struct vring_virtqueue *vq) +{ + int size, i; + + memset(vq->split.vring.desc, 0, vq->split.queue_size_in_bytes); + + size = sizeof(struct vring_desc_state_split) * vq->split.vring.num; + memset(vq->split.desc_state, 0, size); + + size = sizeof(struct vring_desc_extra) * vq->split.vring.num; + memset(vq->split.desc_extra, 0, size); + + for (i = 0; i < vq->split.vring.num - 1; i++) + vq->split.desc_extra[i].next = i + 1; + + virtqueue_init(vq, vq->split.vring.num); + virtqueue_vring_init_split(&vq->split, vq); +} + static void virtqueue_vring_attach_split(struct vring_virtqueue *vq, struct vring_virtqueue_split *vring_split) { -- 2.31.0 _______________________________________________ linux-um mailing list linux-um@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-um