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 E24A4C433EF for ; Sat, 16 Jul 2022 11:35:41 +0000 (UTC) Received: from localhost ([::1]:56302 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oCg5E-0007Hh-UN for qemu-devel@archiver.kernel.org; Sat, 16 Jul 2022 07:35:40 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:52792) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oCg46-000590-Gu for qemu-devel@nongnu.org; Sat, 16 Jul 2022 07:34:30 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:35755) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oCg44-0006zG-Pk for qemu-devel@nongnu.org; Sat, 16 Jul 2022 07:34:30 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1657971268; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Z+MoXENGTkhfESSUfSq/nhfoGvDVnmIdW2wYR+F4SKg=; b=WCNQz/b2ZCfisjVo5wy7mvm0nEhKTC8kB1HVYb4I/ZwcdkuB+WO/ozXs/s4XwvW3sgALz7 HDorx2YjM8cCS+3gWQhVn4T+utMbmNGSLVd9qOezkoVe7CDFvDvbQVJ43ChtZ2GnY/mx9s F7OTa/XZ+E6Xp8xTEW5hIX6dp29vegU= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-328-dbwuTi9YOnK-2xBxNKz_qA-1; Sat, 16 Jul 2022 07:34:24 -0400 X-MC-Unique: dbwuTi9YOnK-2xBxNKz_qA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 64F092932498; Sat, 16 Jul 2022 11:34:24 +0000 (UTC) Received: from eperezma.remote.csb (unknown [10.39.192.64]) by smtp.corp.redhat.com (Postfix) with ESMTP id 581AE40E80E0; Sat, 16 Jul 2022 11:34:20 +0000 (UTC) From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= To: qemu-devel@nongnu.org Cc: Harpreet Singh Anand , Stefano Garzarella , Laurent Vivier , Eli Cohen , Parav Pandit , Markus Armbruster , Eric Blake , Zhu Lingshan , Paolo Bonzini , "Michael S. Tsirkin" , Cindy Lu , Cornelia Huck , Liuxiangdong , Jason Wang , Stefan Hajnoczi , "Gonglei (Arei)" , Gautam Dawar Subject: [RFC PATCH 02/12] vhost: Move SVQ queue rewind to the destination Date: Sat, 16 Jul 2022 13:33:57 +0200 Message-Id: <20220716113407.2730331-3-eperezma@redhat.com> In-Reply-To: <20220716113407.2730331-1-eperezma@redhat.com> References: <20220716113407.2730331-1-eperezma@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.11.54.2 Received-SPF: pass client-ip=170.10.133.124; envelope-from=eperezma@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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" Migration with SVQ already migrate the inflight descriptors, so the destination can perform the work. This makes easier to migrate between backends or to recover them in vhost devices that support set in flight descriptors. Signed-off-by: Eugenio Pérez --- hw/virtio/vhost-vdpa.c | 24 +++++++++++------------- 1 file changed, 11 insertions(+), 13 deletions(-) diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c index 18820498b3..4458c8d23e 100644 --- a/hw/virtio/vhost-vdpa.c +++ b/hw/virtio/vhost-vdpa.c @@ -1178,7 +1178,18 @@ static int vhost_vdpa_set_vring_base(struct vhost_dev *dev, struct vhost_vring_state *ring) { struct vhost_vdpa *v = dev->opaque; + VirtQueue *vq = virtio_get_queue(dev->vdev, ring->index); + /* + * vhost-vdpa devices does not support in-flight requests. Set all of them + * as available. + * + * TODO: This is ok for networking, but other kinds of devices might + * have problems with these retransmissions. + */ + while (virtqueue_rewind(vq, 1)) { + continue; + } if (v->shadow_vqs_enabled) { /* * Device vring base was set at device start. SVQ base is handled by @@ -1197,19 +1208,6 @@ static int vhost_vdpa_get_vring_base(struct vhost_dev *dev, int ret; if (v->shadow_vqs_enabled) { - VirtQueue *vq = virtio_get_queue(dev->vdev, ring->index); - - /* - * Setting base as last used idx, so destination will see as available - * all the entries that the device did not use, including the in-flight - * processing ones. - * - * TODO: This is ok for networking, but other kinds of devices might - * have problems with these retransmissions. - */ - while (virtqueue_rewind(vq, 1)) { - continue; - } ring->num = virtio_queue_get_last_avail_idx(dev->vdev, ring->index); return 0; } -- 2.31.1