I suppose you just use the patch posted in mailing list before. nVidia Geforce
8400 passthrough needs extra hacks. We can make it work in our experiments with
1:1 map of its MMIO BARs.
We are working on gfx passthrough on latest xen-unstable. Firstly, we want to
cook a simple patch including generic changes to support passthrough of
virtualization friendly gfx cards, such as Nvidia FX3800. This patch is
basically done. Then, we will add some hacks for more gfx cards passthrough,
such as iGFX and some Nvidia and ATI cards.
> As I've pointed out on this list before, there are not enough PCIe
> lanes on the DQ45CB to drive both the internal graphics adapter and
> the add-on adapter at the same time. I believe the onboard one may
> be able to operate in some sort of VGA only mode when there is a card
> installed and used as the primary adapter.
> I have a similar setup, using the same motherboard, and an ATI 4770.
> I used the VGA passthrough patches from an earlier posting (I saw you
> followed the same set of instructions), with limited success. I've
> been using 3.4-testing, and 'xenified' 126.96.36.199 kernel. I made
> modifications to the dom0 portion of the patches so they would apply
> to my xenified 2.6.29 kernel. These patches include code that will
> copy the VGA bios to the guest bios instead of using the emulated vga
> bios. I've had very little success, however. I have only tried
> passing through the ATI adapter. In all instances, the guest bios
> messages appear on my monitor, so this much works. In some cases,
> the guest essentially stops there; xm list show's about 2sec CPU
> usage and nothing ever happens after that point. In other cases, the
> guest (win xp/vista/7, as well as KNOPPIX 5.3.1 DVD) will boot all
> the way, but in very low res/color mode, and cannot properly
> initialize the video device. Once or twice, it actually did
> recognize the device and had a reasonable default color/resolution
> combination. In all cases where the guest actually boots, the system
> eventually freezes. In some cases, I get endless streams of iommu
> page faults.
> I have 8GB ram installed. In all cases I've limited dom0 memory to
> 2GB. In all cases, my guest has been assigned 2GB of memory.
> I have a dual core e6600. I've tried allowing dom0 to use both
> cores, offlining one core (using xend dom0_vcpu setting) after boot,
> and restricting dom0 to only one core using the dom0_max_vcpus xen
> hypervisor parameter. In all of these cases I've tried both one and
> two vcpus for the guest. My success with VGA passthrough seems
> somewhat random and no combination of cpu assignment seems to have
> any effect.
> I have not tried with the 2.6.18-xen kernel as I haven't gotten it to
> boot on my hardware; it can never find my volume group, even if I
> create a initrd with all of the required modules, or build those
> drivers into the kernel. I have not spent more than maybe a half an
> hour on this problem; I suspect it may have something to do with the
> version of mkinitrd I'm using (from Fedora 9 x64).
> If anyone else has any insight or similar experience I'd also love to
> hear it.
> Doug Magee
> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Mr. Teo
> En Ming (Zhang Enming)
> Sent: Tuesday, August 25, 2009 11:57 AM
> To: enming.teo@xxxxxxxxxxxxxxx
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] nVidia Geforce 8400 GS PCI Express x16 VGA
> PassThroughto Windows XP Home 32-bit HVM Virtual Machine with Intel
> Desktop BoardDQ45CB
> I have uninstalled Xen 3.4.1 and installed Xen 3.5-unstable as
> by Weidong.
> On 08/25/2009 11:47 PM, Mr. Teo En Ming (Zhang Enming) wrote:
>> Dear All,
>> I have managed to do PCI-e VGA passthrough with the open source Xen
>> but the work is still in progress because although Windows XP guest
>> can see the REAL PCI-e x16 graphics card instead of an emulated
>> graphics driver, it cannot be initialized yet.
>> Thanks to Intel Engineer Han Weidong, Pasi Kärkkäinen, Boris
>> Derzhavets, Marc, Caz Yokoyama, and others who have helped me and
>> shared their knowledge with me along the way.
>> System Configuration:
>> Intel Desktop Board DQ45CB with BIOS upgraded to 0093
>> Onboard Intel GMA 4500 Graphics (IGD)
>> nVidia Geforce 8400 GS PCI Express x16 Graphics Card
>> Fedora 11 Linux 64-bit Xen paravirt operations Domain 0 Host
>> Operating System Xen 3.5 Unstable/Development Type 1 Hypervisor
>> Jeremy Fitzhardinge's Xen paravirt-ops domain 0 Kernel 2.6.31-rc6
>> Primary Video Adapter in BIOS: IGD
>> Please see the screenshots and my blog at the link here:
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