From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christian Tramnitz Subject: Re: VT-D On An Asus P5E-VM DO Motherboard Not Working, Xen 3.4.1 Date: Wed, 30 Sep 2009 13:12:40 +0200 Message-ID: References: <14D9C9E2ED61ED41BC3B37ACDF4E880002E0C4B8F68B@heavy-vm03.heavy.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org Michael MacLeod wrote: > We have a bit of joy now folks. It appears to have been the Initiate > Graphics Adapter setting in the BIOS. It was set to use my PCIe graphics > card as the first option (which is the default value). I set it to use > integrated graphics (Intel 82Q35 Express) and now VT-d is enabled at > boot (even without Dexuan's patch). It's still a BIOS bug, as I believe > I should be able to use a PCIe graphics card and have VT-d work > correctly at the same time. > > Unfortunately, 2.6.18.8-xen does not appear to have support for the > Intel graphics card that is the integrated graphics chip, so I lose my X > display. Oh, and when I try and actually launch a domU, I get this: > Error: pci: PCI Backend and pci-stub don't own device 0000:03:00.0. I > haven't had time to play with any of this yet though, so hopefully I can > surmount these obstacles as well. > > Thanks everyone, > Mike. I could reproduce the error when completely disabling the IGD, but not by changing the init order. I.e. I could successfully but with my Radeon as primary VGA device (with the IGD enabled but as secondary and unused device) and VT-d was still enabled. This could be different when using PCIe because due to the limit of PCIe lanes the IGD might be disabled completely when using a PCIe video card... not sure about this though, so you may give it a try with IGD enabled but PEG/IGD init order. Best regards, Christian