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Mon, 31 Aug 2020 08:30:09 +0000 (UTC) Received: from jason-ThinkPad-X1-Carbon-6th.redhat.com (ovpn-12-88.pek2.redhat.com [10.72.12.88]) by smtp.corp.redhat.com (Postfix) with ESMTP id 023D95D9E2; Mon, 31 Aug 2020 08:30:02 +0000 (UTC) From: Jason Wang To: jasowang@redhat.com, qemu-devel@nongnu.org Subject: [PATCH 9/9] vhost-vdpa: allow pre-opend file descriptor Date: Mon, 31 Aug 2020 16:27:37 +0800 Message-Id: <20200831082737.10983-10-jasowang@redhat.com> In-Reply-To: <20200831082737.10983-1-jasowang@redhat.com> References: <20200831082737.10983-1-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jasowang@redhat.com X-Mimecast-Spam-Score: 0.001 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=63.128.21.124; envelope-from=jasowang@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/31 03:02:42 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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_H5=-1, RCVD_IN_MSPIKE_WL=-0.01, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Markus Armbruster , lulu@redhat.com, mst@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This patch allows to initialize vhost-vdpa network backend with pre opened vhost-vdpa file descriptor. This is useful for running unprivileged qemu through libvirt. Cc: Eric Blake Cc: Markus Armbruster Signed-off-by: Jason Wang --- net/vhost-vdpa.c | 24 +++++++++++++++++++----- qapi/net.json | 5 ++++- 2 files changed, 23 insertions(+), 6 deletions(-) diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c index 9a6f0b63d3..f6385cd264 100644 --- a/net/vhost-vdpa.c +++ b/net/vhost-vdpa.c @@ -206,20 +206,34 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name, (char *)name, errp)) { return -1; } - if (!opts->has_vhostdev) { - error_setg(errp, "vhost-vdpa requires vhostdev to be set"); + if (!(opts->has_vhostdev ^ opts->has_fd)) { + error_setg(errp, "Vhost-vdpa requires either vhostdev or fd to be set"); return -1; } assert(name); nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, TYPE_VHOST_VDPA, name); - snprintf(nc->info_str, sizeof(nc->info_str), "vhostdev=%s", opts->vhostdev); + if (opts->has_vhostdev) { + snprintf(nc->info_str, sizeof(nc->info_str), + "vhostdev=%s", opts->vhostdev); + vdpa_device_fd = qemu_open(opts->vhostdev, O_RDWR); + if (vdpa_device_fd == -1) { + error_setg(errp, "Fail to open vhost-vdpa device %s", + opts->vhostdev); + return -errno; + } + } else { + snprintf(nc->info_str, sizeof(nc->info_str), "fd=%s", opts->fd); + vdpa_device_fd = monitor_fd_param(cur_mon, opts->fd, errp); + if (vdpa_device_fd == -1) { + return -1; + } + } s = DO_UPCAST(VhostVDPAState, nc, nc); - vdpa_device_fd = qemu_open(opts->vhostdev, O_RDWR); if (vdpa_device_fd == -1) { - error_setg(errp, "Fail to open vhost-vdpa device %s", opts->vhostdev); + return -errno; } s->vhost_vdpa.device_fd = vdpa_device_fd; diff --git a/qapi/net.json b/qapi/net.json index a2a94fad3e..5ad60c3045 100644 --- a/qapi/net.json +++ b/qapi/net.json @@ -442,12 +442,15 @@ # @queues: number of queues to be created for multiqueue vhost-vdpa # (default: 1) # +# @fd: file descriptor of an already opened vhost-vdpa (since 5.2) +# # Since: 5.1 ## { 'struct': 'NetdevVhostVDPAOptions', 'data': { '*vhostdev': 'str', - '*queues': 'int' } } + '*queues': 'int', + '*fd': 'str' } } ## # @NetClientDriver: