From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753208AbXDJIAn (ORCPT ); Tue, 10 Apr 2007 04:00:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753209AbXDJIAn (ORCPT ); Tue, 10 Apr 2007 04:00:43 -0400 Received: from mga01.intel.com ([192.55.52.88]:48190 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753208AbXDJIAm (ORCPT ); Tue, 10 Apr 2007 04:00:42 -0400 X-ExtLoop1: 1 X-IronPort-AV: i="4.14,388,1170662400"; d="scan'208"; a="227562671:sNHT671757933" Subject: Re: [patch 0/8] [Intel IOMMU] Support for Intel Virtualization Technology for Directed I/O From: Shaohua Li To: Andi Kleen Cc: Ashok Raj , linux-kernel@vger.kernel.org, akpm@osdl.org, gregkh@suse.de, muli@il.ibm.com, asit.k.mallick@intel.com, suresh.b.siddha@intel.com, anil.s.keshavamurthy@intel.com, arjan@linux.intel.com In-Reply-To: <200704100949.56130.ak@suse.de> References: <20070409215552.221374000@intel.com> <200704100949.56130.ak@suse.de> Content-Type: text/plain Date: Tue, 10 Apr 2007 15:57:28 +0800 Message-Id: <1176191848.6781.3.camel@sli10-conroe.sh.intel.com> Mime-Version: 1.0 X-Mailer: Evolution 2.8.3 (2.8.3-2.fc6) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2007-04-10 at 09:49 +0200, Andi Kleen wrote: > On Monday 09 April 2007 23:55:52 Ashok Raj wrote: > > > Please help review and provide feedback. > > High level question: how did you solve the "user X server needs IOMMU bypass" > problem? Please see patch 5. We have two workarounds for graphics. One is completely bypass dma remapping for gfx, this option only works for gfx card with dedicated dma remapping engine. The other is doing 1-1 mapping for whole physical memory address, then virtual dma address will equal to physical address, so gfx can ignore iommu in the case. Thanks, Shaohua