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

[Gordan Bobic <gordan@xxxxxxxxxx>]

On 05/01/2013 08:42 AM, Andreas Falck wrote:
>  >If only ATI provided a method to contact them for such support,
> considering they claim that they "tested" 4850/4870 cards to work with
> 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, but
> 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 it
> might be different symptoms for different radeon models. This was in xen
> 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 as
> the default.
>
> It might be that AMD got their tested cards working with xen 4.1 and xm,
> 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.
Gordan

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