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=-3.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no 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 C6855C433E0 for ; Thu, 11 Mar 2021 02:29:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8360F64FBA for ; Thu, 11 Mar 2021 02:29:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229633AbhCKC3J (ORCPT ); Wed, 10 Mar 2021 21:29:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46102 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229562AbhCKC25 (ORCPT ); Wed, 10 Mar 2021 21:28:57 -0500 Received: from mail-ej1-x629.google.com (mail-ej1-x629.google.com [IPv6:2a00:1450:4864:20::629]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 59849C061760 for ; Wed, 10 Mar 2021 18:28:57 -0800 (PST) Received: by mail-ej1-x629.google.com with SMTP id p8so43026193ejb.10 for ; Wed, 10 Mar 2021 18:28:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=nGcG4vIt8aK8XQYHFfVsg5ZilyuH9KX5JCZmjoZKMsA=; b=bJFaB7w2p1VmRWq7tx9CxGxY3HG7DINc80iCJrafg+N0T0fIpXcxAoRLUhZsrZnkHt Li+G0KV/JQX5TdIQxf37qh2Yh8LnfZPN/iDVu1Wl6OQR9hFnk23cnOM0oiD2tEnQ89T9 XM0l6SErGC3jeogkdBxN1tzHYTiSG+OKvV36N+3Lc6TJL8YSDu8TguWfBvbVQGHctCtt pvZgbIR96nCZ85xunUrkBEdeR8PN4Wpg7gQgxEIYuMa45vei3621A6dP4TDWpGvUIMs0 bMz74FHMW5d9Q5QDgyt+facrntknlie1x4j9Cc6p3TXqkvVu44bycD9Yd4KnJXHRbxSA yH9w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=nGcG4vIt8aK8XQYHFfVsg5ZilyuH9KX5JCZmjoZKMsA=; b=sD6JvJcB/1vRoe0tcqwGeJbIk6gl4EeemGmfl9U76m0cThbcISHq3R+LUo/Spdzn0A 4KrGanFqG82o4odgheN0NyjNusw+kJ6D9Kqowe0hGcsqBWgyvaxfToyQNdULBdvQJmXx 0gxO4HZySfgCpgAFrq83Ephhris/n7PmYLwGm2WCWRsx1pJkELCh4iE97qsSlFrhZjqi mJt6dp8eMQ3FKW5BX3gejACZ+p0HqSZoMMPaCFGfEUMll63pnG2Z1ldZqJYhhl3mfifH AujMuJz86HP/IA99DbS45Z8ebj9kZXAfIpAAg1uV4YWe4DTrJn+AK1vMcYBQ1td4fBAJ eBLg== X-Gm-Message-State: AOAM533JhKUfrWearEELX9OAcrvm8DXQ7Bbxo7R+dqrEBkibl0Mf6Gwx yKHdDUlrFgsFE3SVuypQXGLoLKNtHY1dkPm5A8iQ X-Google-Smtp-Source: ABdhPJwETmRnZq0PVHiftngf3TWvad/EGIWbau++w4aXQxStI2INxttwkESh3Zs0S3paI2zoVX/YMR2WB71SMvc7KXM= X-Received: by 2002:a17:906:18f1:: with SMTP id e17mr825050ejf.372.1615429736001; Wed, 10 Mar 2021 18:28:56 -0800 (PST) MIME-Version: 1.0 References: <20210223115048.435-1-xieyongji@bytedance.com> <20210223115048.435-8-xieyongji@bytedance.com> <2c7446dd-38f8-a06a-e423-6744c6a7207f@redhat.com> In-Reply-To: <2c7446dd-38f8-a06a-e423-6744c6a7207f@redhat.com> From: Yongji Xie Date: Thu, 11 Mar 2021 10:28:45 +0800 Message-ID: Subject: Re: Re: [RFC v4 07/11] vduse: Introduce VDUSE - vDPA Device in Userspace To: Jason Wang Cc: "Michael S. Tsirkin" , Stefan Hajnoczi , Stefano Garzarella , Parav Pandit , Bob Liu , Christoph Hellwig , Randy Dunlap , Matthew Wilcox , viro@zeniv.linux.org.uk, Jens Axboe , bcrl@kvack.org, Jonathan Corbet , virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, kvm@vger.kernel.org, linux-aio@kvack.org, linux-fsdevel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Wed, Mar 10, 2021 at 8:58 PM Jason Wang wrote: > > > On 2021/2/23 7:50 =E4=B8=8B=E5=8D=88, Xie Yongji wrote: > > + > > + switch (cmd) { > > + case VDUSE_IOTLB_GET_FD: { > > + struct vduse_iotlb_entry entry; > > + struct vhost_iotlb_map *map; > > + struct vdpa_map_file *map_file; > > + struct file *f =3D NULL; > > + > > + ret =3D -EFAULT; > > + if (copy_from_user(&entry, argp, sizeof(entry))) > > + break; > > + > > + spin_lock(&dev->iommu_lock); > > + map =3D vhost_iotlb_itree_first(dev->iommu, entry.start, > > + entry.last); > > + if (map) { > > + map_file =3D (struct vdpa_map_file *)map->opaque; > > + f =3D get_file(map_file->file); > > + entry.offset =3D map_file->offset; > > + entry.start =3D map->start; > > + entry.last =3D map->last; > > + entry.perm =3D map->perm; > > + } > > + spin_unlock(&dev->iommu_lock); > > + if (!f) { > > + ret =3D -EINVAL; > > + break; > > + } > > + if (copy_to_user(argp, &entry, sizeof(entry))) { > > + fput(f); > > + ret =3D -EFAULT; > > + break; > > + } > > + ret =3D get_unused_fd_flags(perm_to_file_flags(entry.perm= )); > > + if (ret < 0) { > > + fput(f); > > + break; > > + } > > + fd_install(ret, f); > > > So at least we need to use receice_fd_user() here to give a chance to be > hooked into security module. > Good point. Will do it in v5. Thanks, Yongji