Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751167AbbKJGUN (ORCPT ); Tue, 10 Nov 2015 01:20:13 -0500 Received: from gate.crashing.org ([63.228.1.57]:50436 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750879AbbKJGUK (ORCPT ); Tue, 10 Nov 2015 01:20:10 -0500 Message-ID: <1447133190.31884.65.camel@kernel.crashing.org> Subject: Re: [PATCH v4 0/6] virtio core DMA API conversion From: Benjamin Herrenschmidt To: Andy Lutomirski Cc: Andy Lutomirski , David Woodhouse , "linux-kernel@vger.kernel.org" , "David S. Miller" , sparclinux@vger.kernel.org, Joerg Roedel , Christian Borntraeger , Cornelia Huck , Sebastian Ott , Paolo Bonzini , Christoph Hellwig , KVM , Martin Schwidefsky , linux-s390 , Linux Virtualization , "Michael S. Tsirkin" Date: Tue, 10 Nov 2015 16:26:30 +1100 In-Reply-To: References: <20151109133624-mutt-send-email-mst@redhat.com> <1447109937.31884.42.camel@kernel.crashing.org> <1447121076.31884.61.camel@kernel.crashing.org> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.18.1 (3.18.1-1.fc23) Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 690 Lines: 19 On Mon, 2015-11-09 at 18:18 -0800, Andy Lutomirski wrote: > > Which leaves the special case of Xen, where even preexisting devices > don't bypass the IOMMU.  Can we keep this specific to powerpc and > sparc?  On x86, this problem is basically nonexistent, since the IOMMU > is properly self-describing. > > IOW, I think that on x86 we should assume that all virtio devices > honor the IOMMU. You don't like performances ? :-) Cheers, Ben. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/