From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joerg Roedel <joro@8bytes.org>
Subject: Re: [Qemu-devel] Re: [RFC PATCH 4/7] ide: IOMMU support
Date: Thu, 15 Jul 2010 19:22:58 +0200
Message-ID: <20100715172258.GI23755@8bytes.org>
References: <1279086307-9596-1-git-send-email-eduard.munteanu@linux360.ro> <4C3E2C2E.70507@codemonkey.ws> <20100714222401.GB21126@sequoia.sous-sol.org> <201007151128.27487.paul@codesourcery.com> <20100715165214.GV14017@sequoia.sous-sol.org> <4C3F3F0D.1000103@redhat.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: Chris Wright <chrisw@sous-sol.org>,
	Paul Brook <paul@codesourcery.com>,
	Anthony Liguori <anthony@codemonkey.ws>,
	Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>,
	qemu-devel@nongnu.org, kvm@vger.kernel.org
To: Avi Kivity <avi@redhat.com>
Return-path: <kvm-owner@vger.kernel.org>
Received: from 8bytes.org ([88.198.83.132]:50770 "EHLO 8bytes.org"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S933860Ab0GORXA (ORCPT <rfc822;kvm@vger.kernel.org>);
	Thu, 15 Jul 2010 13:23:00 -0400
Content-Disposition: inline
In-Reply-To: <4C3F3F0D.1000103@redhat.com>
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>

On Thu, Jul 15, 2010 at 08:02:05PM +0300, Avi Kivity wrote:

> For emulated device, it seems like we can ignore ATS completely, no?

An important use-case for emulation is software testing and caching of
iommu's is an important part that needs to be handled in software. For
this purpose it makes sense to emulate the behavior of caches too. So we
probably should not ignore the possibility of an emulated ATS device
completly.

		Joerg