From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Roedel, Joerg" Subject: Re: IOMMU support for xen in BIOS of AMD based HP DL385g7 and kernel 3.0.0-rc7 Date: Wed, 20 Jul 2011 14:45:48 +0200 Message-ID: <20110720124548.GA21948@amd.com> References: <4E22BAB9.5050002@it-infrastrukturen.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Return-path: Content-Disposition: inline In-Reply-To: <4E22BAB9.5050002@it-infrastrukturen.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: "M. Schneider" Cc: "xen-devel@lists.xensource.com" List-Id: xen-devel@lists.xenproject.org Hi Mark, On Sun, Jul 17, 2011 at 06:34:33AM -0400, M. Schneider wrote: > Please allow me one question about IOMMU support in AMDS's 890FX chipset > and 6176SE CPUs used in HP DL385g7 servers. These chips support IOMMU as > far as I know. BIOS of HP DL385g7 doesn't currently offer an IOMMU flag. > > I have contacted already HP support due to this missing BIOS setting > options but less or more my request has been ignored (no solution and no > plans for solving of this important issue yet) so I am looking for a > workaround as IOMMU support is required for passing thoruhg of PCI > devices to domU domains (xen 4.0 / 4.1). I am sorry but if there is no IVRS table there is not much we can do. The IVRS table contains the information which device uses which request-ids. Without this information the IOMMU can not work reliably. Regards, Joerg -- AMD Operating System Research Center Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach General Managers: Alberto Bozzo, Andrew Bowd Registration: Dornach, Landkr. Muenchen; Registerger. Muenchen, HRB Nr. 43632