From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757184AbYEOJx5 (ORCPT ); Thu, 15 May 2008 05:53:57 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757238AbYEOJxR (ORCPT ); Thu, 15 May 2008 05:53:17 -0400 Received: from mo11.iij4u.or.jp ([210.138.174.79]:52768 "EHLO mo11.iij4u.or.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752318AbYEOJxM (ORCPT ); Thu, 15 May 2008 05:53:12 -0400 Date: Thu, 15 May 2008 18:16:19 +0900 To: andi@firstfloor.org Cc: fujita.tomonori@lab.ntt.co.jp, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, muli@il.ibm.com, alexisb@us.ibm.com Subject: Re: [PATCH 0/2] x86: per-device dma_mapping_ops From: FUJITA Tomonori In-Reply-To: <87y76cym96.fsf@basil.nowhere.org> References: <1210658692-960-1-git-send-email-fujita.tomonori@lab.ntt.co.jp> <87y76cym96.fsf@basil.nowhere.org> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-Id: <20080515181619R.tomof@acm.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 15 May 2008 11:01:09 +0200 Andi Kleen wrote: > FUJITA Tomonori writes: > > > This patchset adds per-device dma_mapping_ops support for > > CONFIG_X86_64 like POWER architecture does. This change enables us to > > cleanly fix the Calgary IOMMU issue that some devices are not behind > > the IOMMU [1]. It also would be helpful to handle KVM PCI passthrough. > > This makes it basically impossible to do stack ops, which some > people have been doing. Seems that I misunderstand what those people want. What those people want to do and how the stack ops achieve it? Or can you tell me where their patches are?