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



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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Attachment: error-1.txt
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