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Re: [Xen-users] VGA/PCI Passthrough of Secondary Graphics Adapter

Does the FirePro exhibit the same issue? Or does it "just work"?

On Wed, 1 May 2013 10:10:05 +0200, Andreas Falck <falck.andreas.lists@xxxxxxxxx> wrote:
Ok, I just started testing a radeon 7790 with my setup, and it seems I
get reset issues after reboot now with xm. No BSOD but the card shows
up as unusable (yellow exlamation mark) after reboot of domU. I'll
update as testing progresses.


2013/5/1 Gordan Bobic

On 05/01/2013 08:42 AM, Andreas Falck wrote:
  Â>If only ATI provided a method to contact them for such support,
 considering they claim that they "tested" 4850/4870 cards to work
 Xen and VGA >passthrough. If they've tested it, it'd be nice if they
 documented it. Personally I've not seen any evidence of the sort of
stability you'd rightfully expect when >the manufacturer vouches that
 something works.

Which toolstack are you using? I have had better success with xm than
 with xl for passing through a 6850 to a windows 7 domU. Namely, I
 experienced the performance degradation on reboot of domU with xl,
 not with xm.

 I am using the xm stack.

  Though I could solve it also under xl by the eject trick
 after reboot of domU - but if this is a general reset related issue
 might be different symptoms for different radeon models. This was in
4.1.x under gentoo and ubuntu (haven't tested xen 4.2+). Relying on a deprecated toolstack is not future-proof of course, but it has worked
 for me so far, and ubuntu 12.10 still uses xen 4.1 which provides xm
 the default.

 It might be that AMD got their tested cards working with xen 4.1 and
 and never tried any more after that.

 I'm taking the claims of AMD having "tested" things with a bucket of
salt until I see the detailed documentation of the process they used
(exact Xen version, dom0 OS stack, domU version and patch level, and
the exact tests carried out in domU). Thus far I have seen no such
documentation, which makes the claims that it was tested pure hearsay.


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