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

  • To: xen-users@xxxxxxxxxxxxx
  • From: Gordan Bobic <gordan@xxxxxxxxxx>
  • Date: Wed, 09 Apr 2014 12:56:02 +0100
  • Delivery-date: Wed, 09 Apr 2014 11:56:48 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>

On 2014-04-09 08:36, H. Sieger wrote:

Does anyone here have a solution? It can't be that AMD users have to
use ancient kernel and Xen releases with a deprecated xm toolstack to
enjoy VGA passthrough.

FWIW, I've never managed to get ATI cards to reliably handle domU
reboots gracefully, regardless of the Xen and kernel versions used.
They work fine on the first domU boot, but in practically all cases
if you need to reboot domU you have to reboot the whole host.

Most recently I tried this with a 7970 on Xen 4.3.0 with Kernel 3.9.9
and that is the result I saw.

AMD are also too quick to abandon old products and OS-es. HD4xxx
series is essentially abandoned, as is XP for the R9 290X cards.
In contrast, Nvidia's drivers still support XP and cards going
back to their 8xxx series cards.

P.S.: I would file bug reports but it seems pointless, there are just
too many things going wrong. The error 22 with xm should have been
solved long ago, and yes, I checked the python code and the bug fix
has been applied in Xen 4.3.0, yet there is again the infamous error
22 message.

It might be worth double-checking that you updated the entire stack,
hypervisor and userspace. When I had this problem that didn't go
away after the patch, it turned out to be because I had some stale
leftovers from the previous installation.

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