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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 1C8A1C3A5A4 for ; Fri, 30 Aug 2019 10:33:37 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id EE10121670 for ; Fri, 30 Aug 2019 10:33:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EE10121670 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=8bytes.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id AF33F5DBD; Fri, 30 Aug 2019 10:33:36 +0000 (UTC) Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 67B735D1C for ; Fri, 30 Aug 2019 10:31:53 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from theia.8bytes.org (8bytes.org [81.169.241.247]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id F0A993D0 for ; Fri, 30 Aug 2019 10:31:52 +0000 (UTC) Received: by theia.8bytes.org (Postfix, from userid 1000) id 21EFB1D5; Fri, 30 Aug 2019 12:31:51 +0200 (CEST) Date: Fri, 30 Aug 2019 12:31:51 +0200 From: Joerg Roedel To: Lu Baolu Subject: Re: [PATCH v7 1/7] iommu/vt-d: Don't switch off swiotlb if use direct dma Message-ID: <20190830103150.GB29382@8bytes.org> References: <20190823071735.30264-1-baolu.lu@linux.intel.com> <20190823071735.30264-2-baolu.lu@linux.intel.com> <20190823083956.GB24194@8bytes.org> <8fb96c3b-c535-6d90-e1e1-c635aec6f178@linux.intel.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <8fb96c3b-c535-6d90-e1e1-c635aec6f178@linux.intel.com> User-Agent: Mutt/1.9.4 (2018-02-28) Cc: alan.cox@intel.com, Christoph Hellwig , Stefano Stabellini , ashok.raj@intel.com, Jonathan Corbet , pengfei.xu@intel.com, Ingo Molnar , David Woodhouse , kevin.tian@intel.com, Konrad Rzeszutek Wilk , Steven Rostedt , Bjorn Helgaas , Boris Ostrovsky , mika.westerberg@linux.intel.com, Juergen Gross , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, jacob.jun.pan@intel.com, Robin Murphy X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org On Sat, Aug 24, 2019 at 10:17:30AM +0800, Lu Baolu wrote: > If a system has any external port, through which an untrusted device > might be connected, the external port itself should be marked as an > untrusted device, and all devices beneath it just inherit this > attribution. Okay, makes sense. > So during iommu driver initialization, we can easily know whether the > system has (or potentially has) untrusted devices by iterating the > device tree. I will add such check in the next version if no objections. Sounds good, thanks Baolu. Joerg _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu