From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=39731 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OZS9F-0004Me-TZ for qemu-devel@nongnu.org; Thu, 15 Jul 2010 13:23:02 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OZS9E-0006WJ-Uy for qemu-devel@nongnu.org; Thu, 15 Jul 2010 13:23:01 -0400 Received: from 8bytes.org ([88.198.83.132]:35806) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OZS9E-0006Vx-8v for qemu-devel@nongnu.org; Thu, 15 Jul 2010 13:23:00 -0400 Date: Thu, 15 Jul 2010 19:22:58 +0200 From: Joerg Roedel Subject: Re: [Qemu-devel] Re: [RFC PATCH 4/7] ide: IOMMU support 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 Content-Disposition: inline In-Reply-To: <4C3F3F0D.1000103@redhat.com> List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Avi Kivity Cc: kvm@vger.kernel.org, qemu-devel@nongnu.org, Chris Wright , Paul Brook , Eduard - Gabriel Munteanu 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