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 22826ECAAA1 for ; Fri, 28 Oct 2022 05:55:29 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ooIFG-0007JM-E1; Fri, 28 Oct 2022 01:49:30 -0400 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 1ooIEp-00073B-W1 for qemu-devel@nongnu.org; Fri, 28 Oct 2022 01:49:07 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ooIEo-0007LO-56 for qemu-devel@nongnu.org; Fri, 28 Oct 2022 01:49:03 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1666936141; 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=LGhVqMZkWBBR+IZPuIg5BKqRoP7WF89qAIOJUndZMn4=; b=f9flb37ZKPFzZfAkezjiQmb9YD0NpkTrk76TjWaWkWIXjLpVs2Sgy1X99PnXnX8vDn2PZu 7RcKMlRIGFuUuy2NduH4xj3VeGZ2yvSmYUTxUjNcKA+R1GS7X7VJc9lUnlAlrb09AEFfxJ uBlJdoZbWchcXzdRGLpnfBm68jYLYcI= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-177-6-mE4bS7OyqBwIu3uLCu2A-1; Fri, 28 Oct 2022 01:48:56 -0400 X-MC-Unique: 6-mE4bS7OyqBwIu3uLCu2A-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 5E1FE185A78F; Fri, 28 Oct 2022 05:48:56 +0000 (UTC) Received: from localhost.localdomain (ovpn-13-50.pek2.redhat.com [10.72.13.50]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1A58DC15BA8; Fri, 28 Oct 2022 05:48:53 +0000 (UTC) From: Jason Wang To: stefanha@redhat.com, qemu-devel@nongnu.org Cc: Si-Wei Liu , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Jason Wang Subject: [PULL 05/26] vhost-vdpa: allow passing opened vhostfd to vhost-vdpa Date: Fri, 28 Oct 2022 13:48:14 +0800 Message-Id: <20221028054835.29674-6-jasowang@redhat.com> In-Reply-To: <20221028054835.29674-1-jasowang@redhat.com> References: <20221028054835.29674-1-jasowang@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 Received-SPF: pass client-ip=170.10.129.124; envelope-from=jasowang@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.515, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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: , Sender: "Qemu-devel" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Si-Wei Liu Similar to other vhost backends, vhostfd can be passed to vhost-vdpa backend as another parameter to instantiate vhost-vdpa net client. This would benefit the use case where only open file descriptors, as opposed to raw vhost-vdpa device paths, are accessible from the QEMU process. (qemu) netdev_add type=vhost-vdpa,vhostfd=61,id=vhost-vdpa1 Signed-off-by: Si-Wei Liu Acked-by: Eugenio Pérez Signed-off-by: Jason Wang --- net/vhost-vdpa.c | 25 ++++++++++++++++++++----- qapi/net.json | 3 +++ qemu-options.hx | 6 ++++-- 3 files changed, 27 insertions(+), 7 deletions(-) diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c index 6d64000..9c1b25d 100644 --- a/net/vhost-vdpa.c +++ b/net/vhost-vdpa.c @@ -634,14 +634,29 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name, assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA); opts = &netdev->u.vhost_vdpa; - if (!opts->vhostdev) { - error_setg(errp, "vdpa character device not specified with vhostdev"); + if (!opts->has_vhostdev && !opts->has_vhostfd) { + error_setg(errp, + "vhost-vdpa: neither vhostdev= nor vhostfd= was specified"); return -1; } - vdpa_device_fd = qemu_open(opts->vhostdev, O_RDWR, errp); - if (vdpa_device_fd == -1) { - return -errno; + if (opts->has_vhostdev && opts->has_vhostfd) { + error_setg(errp, + "vhost-vdpa: vhostdev= and vhostfd= are mutually exclusive"); + return -1; + } + + if (opts->has_vhostdev) { + vdpa_device_fd = qemu_open(opts->vhostdev, O_RDWR, errp); + if (vdpa_device_fd == -1) { + return -errno; + } + } else if (opts->has_vhostfd) { + vdpa_device_fd = monitor_fd_param(monitor_cur(), opts->vhostfd, errp); + if (vdpa_device_fd == -1) { + error_prepend(errp, "vhost-vdpa: unable to parse vhostfd: "); + return -1; + } } r = vhost_vdpa_get_features(vdpa_device_fd, &features, errp); diff --git a/qapi/net.json b/qapi/net.json index dd088c0..926ecc8 100644 --- a/qapi/net.json +++ b/qapi/net.json @@ -442,6 +442,8 @@ # @vhostdev: path of vhost-vdpa device # (default:'/dev/vhost-vdpa-0') # +# @vhostfd: file descriptor of an already opened vhost vdpa device +# # @queues: number of queues to be created for multiqueue vhost-vdpa # (default: 1) # @@ -456,6 +458,7 @@ { 'struct': 'NetdevVhostVDPAOptions', 'data': { '*vhostdev': 'str', + '*vhostfd': 'str', '*queues': 'int', '*x-svq': {'type': 'bool', 'features' : [ 'unstable'] } } } diff --git a/qemu-options.hx b/qemu-options.hx index eb38e5d..876a70a 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -2790,8 +2790,10 @@ DEF("netdev", HAS_ARG, QEMU_OPTION_netdev, " configure a vhost-user network, backed by a chardev 'dev'\n" #endif #ifdef __linux__ - "-netdev vhost-vdpa,id=str,vhostdev=/path/to/dev\n" + "-netdev vhost-vdpa,id=str[,vhostdev=/path/to/dev][,vhostfd=h]\n" " configure a vhost-vdpa network,Establish a vhost-vdpa netdev\n" + " use 'vhostdev=/path/to/dev' to open a vhost vdpa device\n" + " use 'vhostfd=h' to connect to an already opened vhost vdpa device\n" #endif #ifdef CONFIG_VMNET "-netdev vmnet-host,id=str[,isolated=on|off][,net-uuid=uuid]\n" @@ -3296,7 +3298,7 @@ SRST -netdev type=vhost-user,id=net0,chardev=chr0 \ -device virtio-net-pci,netdev=net0 -``-netdev vhost-vdpa,vhostdev=/path/to/dev`` +``-netdev vhost-vdpa[,vhostdev=/path/to/dev][,vhostfd=h]`` Establish a vhost-vdpa netdev. vDPA device is a device that uses a datapath which complies with -- 2.7.4