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 X-Spam-Level: X-Spam-Status: No, score=-11.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1015AC4346E for ; Thu, 24 Sep 2020 03:22:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CC1BD23899 for ; Thu, 24 Sep 2020 03:22:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="QfNmrvwJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726674AbgIXDV4 (ORCPT ); Wed, 23 Sep 2020 23:21:56 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:59898 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726634AbgIXDVz (ORCPT ); Wed, 23 Sep 2020 23:21:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600917713; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=c1vAH2sOnIecyBuC1bgws2niE0JgFrbZ244nIj8c+DU=; b=QfNmrvwJBadRabo8pG733x/M+caGWv6Rz4YK7j+/V5WcSZll9sJP3xp2sva0dbzJ3q2AOj L6g29iRyWkeBMUuvIMZQXGuJJsyw4GsQxsABtcdgUw+AX2y5vIy2sHjDwe4OIqqWp9U+uQ 0xz5cyDe4lcGGxT7RNUBZk2qEsyP4tc= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-437-XMWz49fsN5a-IB1C8BEtBQ-1; Wed, 23 Sep 2020 23:21:51 -0400 X-MC-Unique: XMWz49fsN5a-IB1C8BEtBQ-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 269FE801AF7; Thu, 24 Sep 2020 03:21:50 +0000 (UTC) Received: from jason-ThinkPad-X1-Carbon-6th.redhat.com (ovpn-13-193.pek2.redhat.com [10.72.13.193]) by smtp.corp.redhat.com (Postfix) with ESMTP id BEC8855768; Thu, 24 Sep 2020 03:21:43 +0000 (UTC) From: Jason Wang To: mst@redhat.com, jasowang@redhat.com Cc: lulu@redhat.com, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, rob.miller@broadcom.com, lingshan.zhu@intel.com, eperezma@redhat.com, hanand@xilinx.com, mhabets@solarflare.com, eli@mellanox.com, amorenoz@redhat.com, maxime.coquelin@redhat.com, stefanha@redhat.com, sgarzare@redhat.com, Eli Cohen Subject: [RFC PATCH 01/24] vhost-vdpa: fix backend feature ioctls Date: Thu, 24 Sep 2020 11:21:02 +0800 Message-Id: <20200924032125.18619-2-jasowang@redhat.com> In-Reply-To: <20200924032125.18619-1-jasowang@redhat.com> References: <20200924032125.18619-1-jasowang@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Commit 653055b9acd4 ("vhost-vdpa: support get/set backend features") introduces two malfunction backend features ioctls: 1) the ioctls was blindly added to vring ioctl instead of vdpa device ioctl 2) vhost_set_backend_features() was called when dev mutex has already been held which will lead a deadlock This patch fixes the above issues. Cc: Eli Cohen Reported-by: Zhu Lingshan Fixes: 653055b9acd4 ("vhost-vdpa: support get/set backend features") Signed-off-by: Jason Wang --- drivers/vhost/vdpa.c | 30 ++++++++++++++++-------------- 1 file changed, 16 insertions(+), 14 deletions(-) diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 3fab94f88894..796fe979f997 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -353,8 +353,6 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd, struct vdpa_callback cb; struct vhost_virtqueue *vq; struct vhost_vring_state s; - u64 __user *featurep = argp; - u64 features; u32 idx; long r; @@ -381,18 +379,6 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd, vq->last_avail_idx = vq_state.avail_index; break; - case VHOST_GET_BACKEND_FEATURES: - features = VHOST_VDPA_BACKEND_FEATURES; - if (copy_to_user(featurep, &features, sizeof(features))) - return -EFAULT; - return 0; - case VHOST_SET_BACKEND_FEATURES: - if (copy_from_user(&features, featurep, sizeof(features))) - return -EFAULT; - if (features & ~VHOST_VDPA_BACKEND_FEATURES) - return -EOPNOTSUPP; - vhost_set_backend_features(&v->vdev, features); - return 0; } r = vhost_vring_ioctl(&v->vdev, cmd, argp); @@ -440,8 +426,20 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, struct vhost_vdpa *v = filep->private_data; struct vhost_dev *d = &v->vdev; void __user *argp = (void __user *)arg; + u64 __user *featurep = argp; + u64 features; long r; + if (cmd == VHOST_SET_BACKEND_FEATURES) { + r = copy_from_user(&features, featurep, sizeof(features)); + if (r) + return r; + if (features & ~VHOST_VDPA_BACKEND_FEATURES) + return -EOPNOTSUPP; + vhost_set_backend_features(&v->vdev, features); + return 0; + } + mutex_lock(&d->mutex); switch (cmd) { @@ -476,6 +474,10 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, case VHOST_VDPA_SET_CONFIG_CALL: r = vhost_vdpa_set_config_call(v, argp); break; + case VHOST_GET_BACKEND_FEATURES: + features = VHOST_VDPA_BACKEND_FEATURES; + r = copy_to_user(featurep, &features, sizeof(features)); + break; default: r = vhost_dev_ioctl(&v->vdev, cmd, argp); if (r == -ENOIOCTLCMD) -- 2.20.1