From mboxrd@z Thu Jan 1 00:00:00 1970 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CEA5EC61D97 for ; Sun, 29 Jan 2023 02:52:36 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pLxnY-0001T7-8M; Sat, 28 Jan 2023 21:52:04 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pLxnW-0001Sn-5j for qemu-devel@nongnu.org; Sat, 28 Jan 2023 21:52:02 -0500 Received: from out30-6.freemail.mail.aliyun.com ([115.124.30.6]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pLxnT-0007Bk-7S for qemu-devel@nongnu.org; Sat, 28 Jan 2023 21:52:01 -0500 X-Alimail-AntiSpam: AC=PASS; BC=-1|-1; BR=01201311R121e4; CH=green; DM=||false|; DS=||; FP=0|-1|-1|-1|0|-1|-1|-1; HT=ay29a033018046056; MF=xuanzhuo@linux.alibaba.com; NM=1; PH=DS; RN=3; SR=0; TI=SMTPD_---0VaIzrDu_1674960711; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0VaIzrDu_1674960711) by smtp.aliyun-inc.com; Sun, 29 Jan 2023 10:51:51 +0800 From: Xuan Zhuo To: qemu-devel@nongnu.org Cc: "Michael S. Tsirkin" , Jason Wang Subject: [PATCH v1 1/2] virtio: struct VirtQueue introduce reset Date: Sun, 29 Jan 2023 10:51:49 +0800 Message-Id: <20230129025150.119972-2-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20230129025150.119972-1-xuanzhuo@linux.alibaba.com> References: <20230129025150.119972-1-xuanzhuo@linux.alibaba.com> MIME-Version: 1.0 X-Git-Hash: d3903c2c1b Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=115.124.30.6; envelope-from=xuanzhuo@linux.alibaba.com; helo=out30-6.freemail.mail.aliyun.com X-Spam_score_int: -98 X-Spam_score: -9.9 X-Spam_bar: --------- X-Spam_report: (-9.9 / 5.0 requ) BAYES_00=-1.9, ENV_AND_HDR_SPF_MATCH=-0.5, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, USER_IN_DEF_SPF_WL=-7.5 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org In the current design, we stop the device from operating on the vring during per-queue reset by resetting the structure VirtQueue. But before the reset operation, when recycling some resources, we should stop referencing new vring resources. For example, when recycling virtio-net's asynchronous sending resources, virtio-net should be able to perceive that the current queue is in the per-queue reset state, and stop sending new packets from the tx queue. Signed-off-by: Xuan Zhuo --- hw/virtio/virtio.c | 15 +++++++++++++++ include/hw/virtio/virtio.h | 1 + 2 files changed, 16 insertions(+) diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index f35178f5fc..c954f2a2b3 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -142,6 +142,8 @@ struct VirtQueue /* Notification enabled? */ bool notification; + bool disabled_by_reset; + uint16_t queue_index; unsigned int inuse; @@ -2079,6 +2081,12 @@ void virtio_queue_reset(VirtIODevice *vdev, uint32_t queue_index) { VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); + /* + * Mark this queue is per-queue reset status. The device should release the + * references of the vring, and not refer more new vring item. + */ + vdev->vq[queue_index].disabled_by_reset = true; + if (k->queue_reset) { k->queue_reset(vdev, queue_index); } @@ -2102,11 +2110,18 @@ void virtio_queue_enable(VirtIODevice *vdev, uint32_t queue_index) } */ + vdev->vq[queue_index].disabled_by_reset = false; + if (k->queue_enable) { k->queue_enable(vdev, queue_index); } } +bool virtio_queue_reset_state(VirtQueue *vq) +{ + return vq->disabled_by_reset; +} + void virtio_reset(void *opaque) { VirtIODevice *vdev = opaque; diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h index 77c6c55929..00e91af7c4 100644 --- a/include/hw/virtio/virtio.h +++ b/include/hw/virtio/virtio.h @@ -319,6 +319,7 @@ int virtio_set_status(VirtIODevice *vdev, uint8_t val); void virtio_reset(void *opaque); void virtio_queue_reset(VirtIODevice *vdev, uint32_t queue_index); void virtio_queue_enable(VirtIODevice *vdev, uint32_t queue_index); +bool virtio_queue_reset_state(VirtQueue *vq); void virtio_update_irq(VirtIODevice *vdev); int virtio_set_features(VirtIODevice *vdev, uint64_t val); -- 2.32.0.3.g01195cf9f