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

  • To: "'Gordan Bobic'" <gordan@xxxxxxxxxx>, <xen-users@xxxxxxxxxxxxx>
  • From: "Eric Houby" <ehouby@xxxxxxxxx>
  • Date: Wed, 9 Apr 2014 14:09:58 -0600
  • Delivery-date: Wed, 09 Apr 2014 20:10:57 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>
  • Thread-index: AQLi6CL22cVLZBzJg5VCM2Lfh4crpgD7AjsWmNqnwrA=

> 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.

I have had a different experience with my Radeon HD 7750  (as well as an HD
5750) and a GA-890FXA-UD5 motherboard.  With this hardware combination, PCI
passthrough works not only on older versions of Xen, but also with Xen 4.4
and F20 using the xl toolstack.  It works after many reboots of the Win7/8.1
guest and the system is stable for weeks+ of uptime.
However, with the same video cards, Xen 4.4, and F20, but running on a
GA-990FXA-UD3 the best I have ever been able get is a single boot of the
guest.  If the guest is rebooted, PCI passthrough fails and the whole box
needs to reboot for it to work again.  I have not found a solution to this
problem but would be able provide logs from the HD7750/GA-890FXA if they
would be of value in troubleshooting.

To get PCI passthrough working on the FA-990FXA, I bought a GTX480 and did a
software mod as mentioned earlier in this thread.  The GTX480 was modified
to a Quadro 6000 and PCI passthrough is working well with the GA-990FX.  


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