From patchwork Wed May 25 10:59:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Eugenio Perez Martin X-Patchwork-Id: 12860988 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 EB5B7C433F5 for ; Wed, 25 May 2022 11:00:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234032AbiEYLAR (ORCPT ); Wed, 25 May 2022 07:00:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51910 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242606AbiEYLAM (ORCPT ); Wed, 25 May 2022 07:00:12 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id D6A6B7980C for ; Wed, 25 May 2022 04:00:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1653476410; 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=NlxBW7wk8695Knmv4EkJy0sRMvfqe1PLsU+Qmw4ofPU=; b=EJkTqd4DDrF35M0opeo0S+IiEM3YOvInhGtxYjaF1dCB2qgrjBY/LV9jTGYCmmplVgQ1H8 08K0+nmqka4aLgVdxCk912NarDdZNv+QvRiPc+I7Oo+J9qrTFZQ8bUFDL3YwN2239wZw/S O8KBFh8lx9nYj7Gwat12QyeFkmWfMxo= 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-8-k3rwf3ytO6ebUOz1zbXP5Q-1; Wed, 25 May 2022 07:00:06 -0400 X-MC-Unique: k3rwf3ytO6ebUOz1zbXP5Q-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id C59EC29AB3EB; Wed, 25 May 2022 11:00:04 +0000 (UTC) Received: from eperezma.remote.csb (unknown [10.39.192.180]) by smtp.corp.redhat.com (Postfix) with ESMTP id BE2A17AD8; Wed, 25 May 2022 10:59:56 +0000 (UTC) From: =?utf-8?q?Eugenio_P=C3=A9rez?= To: "Michael S. Tsirkin" , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, Jason Wang Cc: Zhu Lingshan , martinh@xilinx.com, Stefano Garzarella , ecree.xilinx@gmail.com, Eli Cohen , Dan Carpenter , Parav Pandit , Wu Zongyong , dinang@xilinx.com, Christophe JAILLET , Xie Yongji , gautam.dawar@amd.com, lulu@redhat.com, martinpo@xilinx.com, pabloc@xilinx.com, Longpeng , Piotr.Uminski@intel.com, tanuj.kamde@amd.com, Si-Wei Liu , habetsm.xilinx@gmail.com, lvivier@redhat.com, Zhang Min , hanand@xilinx.com Subject: [PATCH v3 3/4] vhost-vdpa: uAPI to stop the device Date: Wed, 25 May 2022 12:59:21 +0200 Message-Id: <20220525105922.2413991-4-eperezma@redhat.com> In-Reply-To: <20220525105922.2413991-1-eperezma@redhat.com> References: <20220525105922.2413991-1-eperezma@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The ioctl adds support for stop the device from userspace. Signed-off-by: Eugenio Pérez Reported-by: kernel test robot Reported-by: kernel test robot --- drivers/vhost/vdpa.c | 18 ++++++++++++++++++ include/uapi/linux/vhost.h | 14 ++++++++++++++ 2 files changed, 32 insertions(+) diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 32713db5831d..a5d33bad92f9 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -478,6 +478,21 @@ static long vhost_vdpa_get_vqs_count(struct vhost_vdpa *v, u32 __user *argp) return 0; } +static long vhost_vdpa_stop(struct vhost_vdpa *v, u32 __user *argp) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + int stop; + + if (!ops->stop) + return -EOPNOTSUPP; + + if (copy_from_user(&stop, argp, sizeof(stop))) + return -EFAULT; + + return ops->stop(vdpa, stop); +} + static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd, void __user *argp) { @@ -650,6 +665,9 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, case VHOST_VDPA_GET_VQS_COUNT: r = vhost_vdpa_get_vqs_count(v, argp); break; + case VHOST_STOP: + r = vhost_vdpa_stop(v, argp); + break; default: r = vhost_dev_ioctl(&v->vdev, cmd, argp); if (r == -ENOIOCTLCMD) diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h index cab645d4a645..c7e47b29bf61 100644 --- a/include/uapi/linux/vhost.h +++ b/include/uapi/linux/vhost.h @@ -171,4 +171,18 @@ #define VHOST_VDPA_SET_GROUP_ASID _IOW(VHOST_VIRTIO, 0x7C, \ struct vhost_vring_state) +/* Stop or resume a device so it does not process virtqueue requests anymore + * + * After the return of ioctl with stop != 0, the device must finish any + * pending operations like in flight requests. It must also preserve all + * the necessary state (the virtqueue vring base plus the possible device + * specific states) that is required for restoring in the future. The + * device must not change its configuration after that point. + * + * After the return of ioctl with stop == 0, the device can continue + * processing buffers as long as typical conditions are met (vq is enabled, + * DRIVER_OK status bit is enabled, etc). + */ +#define VHOST_VDPA_STOP _IOW(VHOST_VIRTIO, 0x7D, int) + #endif