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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 CC31BC10F25 for ; Wed, 11 Mar 2020 06:50:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A19FA208C4 for ; Wed, 11 Mar 2020 06:50:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728282AbgCKGuo (ORCPT ); Wed, 11 Mar 2020 02:50:44 -0400 Received: from mga01.intel.com ([192.55.52.88]:32011 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726472AbgCKGuo (ORCPT ); Wed, 11 Mar 2020 02:50:44 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 10 Mar 2020 23:50:43 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,539,1574150400"; d="scan'208";a="242588178" Received: from blu2-mobl3.ccr.corp.intel.com (HELO [10.254.208.137]) ([10.254.208.137]) by orsmga003.jf.intel.com with ESMTP; 10 Mar 2020 23:50:40 -0700 Cc: baolu.lu@linux.intel.com, ashok.raj@intel.com, jacob.jun.pan@linux.intel.com, kevin.tian@intel.com, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Daniel Drake , Derrick Jonathan , Jerry Snitselaar , Robin Murphy , Christoph Hellwig Subject: Re: [PATCH 0/6] Replace private domain with per-group default To: Joerg Roedel References: <20200307062014.3288-1-baolu.lu@linux.intel.com> <20200310111503.GF3794@8bytes.org> From: Lu Baolu Message-ID: Date: Wed, 11 Mar 2020 14:50:39 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200310111503.GF3794@8bytes.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Joerg, On 2020/3/10 19:15, Joerg Roedel wrote: > Hi Baolu, > > On Sat, Mar 07, 2020 at 02:20:08PM +0800, Lu Baolu wrote: >> Lu Baolu (5): >> iommu: Configure default domain with dev_def_domain_type >> iommu/vt-d: Don't force 32bit devices to uses DMA domain >> iommu/vt-d: Don't force PCI sub-hierarchy to use DMA domain >> iommu/vt-d: Add dev_def_domain_type callback >> iommu/vt-d: Apply per-device dma_ops >> >> Sai Praneeth Prakhya (1): >> iommu: Add dev_def_domain_type() callback in iommu_ops > > I like this patch-set, but I fear some regressions from patch > "iommu/vt-d: Don't force 32bit devices to uses DMA domain". Have you > tested this series on a couple of machines, ideally even older ones from > the first generation of VT-d hardware? The oldest hardware I have is Ivy Bridge. :-) Actually, The effect of using identity domain for 32-bit devices is the same as that of adding intel_iommu=off in the kernel parameter. Hence, if there is any regression, people should also find it with intel_iommu=off. intel_iommu=off support is added at the very beginning of VT-d driver. Best regards, baolu