On Mon, Feb 14, 2011 at 08:22:09PM -0800, Leonardo Prosperi wrote:
> Hi,
> I have got VGA passthrough to work in my computer with Windows7 HVM guest.
>
Nice!
> Motherboard: ASUS Crosshair IV Formula (890fx chipset)
> Video card: HIS Radeon HD 6850
>
> Xen: 4.0.2-pre2 from xen-4.0-testing.hg
> Kernel: pvops dom0 kernel 2.6.32 from Jeremy's xen.git
>
> In order to compile Xen 4.0 in Ubuntu 10.10 I changed the default python
> directory in Makefile as describe in the guide.
> I downloaded the bios from my videocard and I patched Xen to load the
> vgabios. ( I don't know if this is necessary)
>
Did you try without?
> I compiled the kernel with EXT4 support and the driver for my network
> card.
>
> In the Grub configuration file I added:
> iommu=1
> xen-pciback.hide=(05:00.0)
> text
>
> 05:00.0 is a SATA controller, it is not the videocard.
>
So I take it you're passing SATA controller to Windows aswell?
> If I hide the videocard with pciback, I cannot see the console and I have
> to use SSH.
>
Yep.
> I wrote a script that disconnects the videocard and the USB controller
> (where mouse and keyboard are connected) from dom0, and then start the HVM
> guest.
>
> I pass the 3 available pci controllers to the HVM guest and the system
> boots Windows 7 without problems.
Good.
> I don't see the BIOS messages and the Windows 7 loading screen, but I see
> only the login screen (there is a patch for this, but I will test it
> later)
> I can see the Windows 7 loading screen, if I have use SSH+VNC from another
> computer.
> The HVM guest has full 3D acceleration and it uses Catalyst 11.1 drivers.
>
Nice!
> I hope this info will help someone else.
>
It should!
> It is working but I have some questions for the experts:
> I don't use: gfx_passthru=1 , if I enable it, VGA passthrough doesn't work
> and VNC will connect to the QEMU console.
> Why does it work without gfx_passthru=1?
>
That's interesting. Any ideas?
Any errors in the logs? "xm log" and also /var/log/xen/*
> I used GPU-Z to detect the video card in Windows 7 HVM, and it reported
> that it is using boch vgabios.
> Is there a way to know if the real BIOS is loaded?
>
Hmm.. weird. Oh, it's probably the primary qemu vga adapter,
I bet you have two vga controllers in the VM because you don't have
gfx_passthru=1 enabled?
> I cannot pass the keyboard as USB device, I had to pass the USB
> controller.
> How can I pass the keyboard as usb device?
>
There are some prelimiary patches for this, but no final 'clean' solution..
Some XCI guys were working on this earlier, but I don't know the current
status..
> Is there a way to pass the video card back to dom0?
>
Not sure.
-- Pasi
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