From patchwork Mon Aug 1 06:38:42 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 12933492 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 838E7C19F2C for ; Mon, 1 Aug 2022 06:41:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236133AbiHAGlG (ORCPT ); Mon, 1 Aug 2022 02:41:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35232 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234127AbiHAGkk (ORCPT ); Mon, 1 Aug 2022 02:40:40 -0400 Received: from out30-133.freemail.mail.aliyun.com (out30-133.freemail.mail.aliyun.com [115.124.30.133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C2B491583D; Sun, 31 Jul 2022 23:39:55 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R131e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045170;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=37;SR=0;TI=SMTPD_---0VL1cCjy_1659335985; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0VL1cCjy_1659335985) by smtp.aliyun-inc.com; Mon, 01 Aug 2022 14:39:46 +0800 From: Xuan Zhuo 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 Subject: [PATCH v14 22/42] virtio_ring: packed: introduce virtqueue_reinit_packed() Date: Mon, 1 Aug 2022 14:38:42 +0800 Message-Id: <20220801063902.129329-23-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20220801063902.129329-1-xuanzhuo@linux.alibaba.com> References: <20220801063902.129329-1-xuanzhuo@linux.alibaba.com> MIME-Version: 1.0 X-Git-Hash: 0f12e405b061 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org 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 | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 93d2a950f536..db06fb0ddfd6 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -1957,6 +1957,18 @@ static void virtqueue_vring_attach_packed(struct vring_virtqueue *vq, vq->free_head = 0; } +static void virtqueue_reinit_packed(struct vring_virtqueue *vq) +{ + memset(vq->packed.vring.device, 0, vq->packed.event_size_in_bytes); + memset(vq->packed.vring.driver, 0, vq->packed.event_size_in_bytes); + + /* we need to reset the desc.flags. For more, see is_used_desc_packed() */ + memset(vq->packed.vring.desc, 0, vq->packed.ring_size_in_bytes); + + virtqueue_init(vq, vq->packed.vring.num); + virtqueue_vring_init_packed(&vq->packed, !!vq->vq.callback); +} + static struct virtqueue *vring_create_virtqueue_packed( unsigned int index, unsigned int num,