Re: [Xen-users] AMD cards - VGA passthrough no more possible with newer Xen / kernel releases

["H. Sieger" <powerhouse.linux@xxxxxxxxx>]

Thanks for your reply, Ian.

My regular rig uses a Nvidia Quadro 2000 card for VGA passthrough, so I need to change the setup each time I want to test AMD card passthrough.

If a dev or someone at AMD is looking into these bugs (or issues) I'll be glad to help out with tests and logs. My last attempts to get a AMD 6450 card passthrough to a Windows 7 guest were very time constrained and I didn't properly record or save logs and other information. But I would be willing to repeat the tests and do a better job at documenting everything.

I'm not a developer and can't code, except some simple shell scripts. So changing the source code is out of the question for me.

I'd be glad to be brought in touch with the AMD people to get this resolved, and I'm willing to help out where I can (time permitted). For reference, I've written a VGA passthrough how-to on the Linux Mint forum and others on that forum have reported the same/similar results (see also my previous mail).

I can be contacted via this mail.

On Wednesday, April 9, 2014 12:54 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:

On Wed, 2014-04-09 at 00:36 -0700, H. Sieger wrote:
> As to the domU shutdown/reboot issue with xl it has been reported many
> times.

Please do report bugs or "bump" existing ones if they are affecting you.

For issues with xl it would be useful to try both qemu-xen and
qemu-xen-traditional as the device model.

Your logs show an issue connecting the disks, which seems unlikely to be
directly related to passthrough, more likely it is a knockon effect from
something else failing and qemu giving up. It might be that the qemu
logs (under /var/log/xen/*dm*.log) show more info.

> The only thing I haven't read yet is that someone is trying to fix
> this. Or is there actually a fix or release that works?

Unfortunately VGA passthrough is an area which although devs are
interested in few actually have the time available to work on.

That said I think there is currently someone from AMD looking into
passthrough. If you are interested in this functionality and have the
hardware then I'm sure they'd be interested in any help you can give,
either in the form of patches or testing or investigating issues etc.

Ian.

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