Re: [Xen-users] VGA passthrough ? AMD-FX8, GA-990FXA-UD3, G210

[Adrien Urban <adrien.urban@xxxxxxxxxxxxxx>]

Hello,

On 05/15/12 13:39, Andrew Bobulsky wrote:
> Hello Adrien,
>
> I've been tinkering with  GA-990FX-UD7 the past few days, and its
> lspci is remarkably similar to yours!  Considering that the logical
> layout (from a PCI standpoint) should be identical, you should be able
> to get PCI passthrough to work.
Thanks for confirming it should work. That helps motivate the researches :)

> Without special patches, the gfx_passthru option won't work right, so
> leave it = 0, or undefined.  This will pass the PCIe video card as a
> secondary graphics adapter, and will work after your DomU OS boots up.
>   I can confirm that it works with my AMD gfx card on Windows 7, but
> haven't gotten it to work in Ubuntu DomU yet.  That may be a kernel
> thing.
Why shouldn't it wolk with gfx_passthru ? what patches would be required ?
If it's possible, i'll work on it until I get them to boot directly on it.

>    Additionally, the sound device, which for me also shows up as
> 00:14.2, works equally as well.
Yeah, thanks. After trying a few more times, I managed to find that my 
tests were having trouble, and passing it at a later time, I managed to 
get some sound in the domU.
> I might suggest you start by making sure you hide all the devices,
> boot your Dom0, then SSH into the box, start your VM, VNC into the VM,
> and try adding the devices one at a time with "xl pci-attach" (or "xm
> pci-attach").  I found this was easiest with a USB controller or the
> sound card.  Once you get one thing working, try adding more, and see
> what you get! :)
Yes, I did that, and got sound. The sound card moved properly without 
any trouble.
I added a second graphic card in the system, so i can send one, and keep 
one for the dom0 (just makes my life easier).
The two VGA cards look like this :

01:00.0 VGA compatible controller: NVIDIA Corporation G86 [GeForce 8400 
GS] (rev a1)
04:00.0 VGA compatible controller: NVIDIA Corporation GT218 [GeForce 
210] (rev a2)
As they are both nvidia, it's really easy to change my X configuration 
to get from one to the other... but it also means I face the same bugs 
when something goes wrong.
After sending the card to the domU, it starts loading the nouveau 
module, but ends with a divide error. (dmesg attached. 3 of them: with 
GT210, specifying an other pci slot, and with 8400).
Trying to start a X in the domU fails. It seems to start correctly, but 
just doesn't show anything on the screen, and trying to change vt (chvt 
1) doesn't do anything... (Xorg.0.log attached)
Regards,
Adrien

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