[Xen-users] VGA passthrough to HVM Linux domU

[Daniel Shub <Daniel.Shub@xxxxxxxxxxxxxxxx>]

I am having problems getting my 64-bit Debian Squeeze (Xen version 4.0, Linux 
Kernel 2.6.32) dom0 to pass a Gigabyte HD 5450 graphics card to an HVM 64-bit 
Arch Linux domU. I have two Gigabyte HD 5450 graphics cards connected to my 
Gigabyte GA-X79-UP4 motherboard. I can pass the secondary card (the one the 
bios doesn’t show up on) to an HVM 32-bit Windows XP domU (I thought that would 
be the hard part, but it was easy with the Xen wiki). For the Linux domU, I 
cannot get the VGA passthrough to work.

I started with essentially the same cfg file that worked for Windows. This lead 
to an “Expecting atombios for evergreen GPU” warning followed by “Fatal error 
during GPU init” in the Linux domU. I installed the AMD proprietary drivers and 
the warning and error went away. Both the virtual and physical VGA devices are 
listed by lspci in the Linux domU, but I cannot seem to use the physical 
device. I then tried to passthrough the primary adaptor. It doesn’t work and I 
cannot even start X11/VNC in the dom0 to inspect the domU. I have also tried 
adding gfx_passthru=1 to my cfg file and this prevents the domU from booting.

I would appreciate any suggestions as to where to look for problems.

My cfg file is:

name = "Arch"
builder = "hvm"
kernel = "/usr/lib/xen-4.0/boot/hvmloader"
device_model = "qemu-dm"
on_poweroff = "destroy"
on_reboot = "restart"
on_crash = "restart"
memory = 8192
vcpus = 1
vif = [ 'bridge=xenbr0' ]
disk = [ 'phy:/dev/mapper/vg0-arch,xvda,w' ]
pci = [ '01:00.0', '01:00.1' ]
boot = "c"
stdvga = 1
#gfx_passthru = 1
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