From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752879AbcLEWHZ (ORCPT ); Mon, 5 Dec 2016 17:07:25 -0500 Received: from bombadil.infradead.org ([198.137.202.9]:44143 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751497AbcLEWHV (ORCPT ); Mon, 5 Dec 2016 17:07:21 -0500 Message-ID: <1480975635.81411.4.camel@infradead.org> Subject: Re: [PATCH] iommu/intel: disable DMAR for Q35 integrated gfx From: David Woodhouse To: Kees Cook , Daniel Vetter Cc: iommu@lists.linux-foundation.org, Jani Nikula , intel-gfx@lists.freedesktop.org, Joerg Roedel , linux-kernel@vger.kernel.org Date: Mon, 05 Dec 2016 22:07:15 +0000 In-Reply-To: <20161205215841.GA20819@beast> References: <20161205215841.GA20819@beast> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-RTMBUpvm/Kdpg1LpH+xy" X-Mailer: Evolution 3.22.2 (3.22.2-1.fc25) 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 --=-RTMBUpvm/Kdpg1LpH+xy Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2016-12-05 at 13:58 -0800, Kees Cook wrote: > This blacklists the Q35 integrated graphics so IOMMU can be otherwise > enabled. Without this, a Q35 system can only enable IOMMU when booting > with "intel_iommu=3Don,igfx_off" but not "intel_iommu=3Don". Hm, is this definitely the same bug? Or is it something different, and perhaps a BIOS issue? 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