Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752448AbbKVPyc (ORCPT ); Sun, 22 Nov 2015 10:54:32 -0500 Received: from bombadil.infradead.org ([198.137.202.9]:58960 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752146AbbKVPya (ORCPT ); Sun, 22 Nov 2015 10:54:30 -0500 Message-ID: <1448207661.89124.50.camel@infradead.org> Subject: Re: [PATCH v3 0/3] virtio DMA API core stuff From: David Woodhouse To: marcel@redhat.com, Joerg Roedel , "Michael S. Tsirkin" Cc: linux-s390 , KVM , Benjamin Herrenschmidt , Sebastian Ott , "linux-kernel@vger.kernel.org" , Andy Lutomirski , Christian Borntraeger , Andy Lutomirski , Paolo Bonzini , Linux Virtualization , Christoph Hellwig , Martin Schwidefsky Date: Sun, 22 Nov 2015 15:54:21 +0000 In-Reply-To: <5651BDC0.2040206@gmail.com> References: <1446039327.3405.216.camel@infradead.org> <20151028155105-mutt-send-email-mst@redhat.com> <1446041609.3405.228.camel@infradead.org> <20151028161424-mutt-send-email-mst@redhat.com> <1446042754.3405.237.camel@infradead.org> <20151028175136-mutt-send-email-mst@redhat.com> <20151029104301-mutt-send-email-mst@redhat.com> <1446135536.3405.279.camel@infradead.org> <20151108120627-mutt-send-email-mst@redhat.com> <20151108114946.GG2255@suse.de> <5651BDC0.2040206@gmail.com> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-h0n9eUi5Ew0K9zHzUi66" X-Mailer: Evolution 3.18.1 (3.18.1-1.fc23) Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9033 Lines: 144 --=-h0n9eUi5Ew0K9zHzUi66 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sun, 2015-11-22 at 15:06 +0200, Marcel Apfelbaum wrote: >=20 >=20 > I tried to generate a DMAR table that excludes some devices from > IOMMU translation, however it does not help. >=20 > The reason is, as far as I understand, that Linux kernel does > not allow any device being outside an IOMMU scope if the > iommu kernel option is activated. >=20 > Does anybody know if it is "by design" or is simply an uncommon > configuration? > (some devices in an IOMMU scope, while others outside *any* IOMMU > scope) That's a kernel bug in the way it handles per-device DMA operations. Or more to the point, in the way it doesn't =E2=80=94 the non-translated devic= es end up being pointed to the intel_dma_ops despite the fact they shouldn't be. 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