From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763359AbYEOS3F (ORCPT ); Thu, 15 May 2008 14:29:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756180AbYEOS2y (ORCPT ); Thu, 15 May 2008 14:28:54 -0400 Received: from e4.ny.us.ibm.com ([32.97.182.144]:50259 "EHLO e4.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755267AbYEOS2x (ORCPT ); Thu, 15 May 2008 14:28:53 -0400 Subject: Re: [PATCH 0/2] x86: per-device dma_mapping_ops From: Alexis Bruemmer To: FUJITA Tomonori , andi@firstfloor.org Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org, muli@il.ibm.com In-Reply-To: <20080515181619R.tomof@acm.org> References: <1210658692-960-1-git-send-email-fujita.tomonori@lab.ntt.co.jp> <87y76cym96.fsf@basil.nowhere.org> <20080515181619R.tomof@acm.org> Content-Type: text/plain Date: Thu, 15 May 2008 11:25:11 -0700 Message-Id: <1210875911.5596.22.camel@alexis> Mime-Version: 1.0 X-Mailer: Evolution 2.22.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2008-05-15 at 18:16 +0900, FUJITA Tomonori wrote: > 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? Yes an explanation of stack ops, or a pointer to a patch set that implements them would be very useful.