Re: [Xen-users] vga passthrough with amd radeon r9 285

["Teo En Ming (Zhang Enming)" <teo-en-ming@xxxxxxxxxxxxxxxxxx>]

Thanks Stephen Oberholtzer for the information.

I am considering to buy AMD R9 285 a few months down the road. It only 
costs SGD$350.
--
Yours sincerely,

Mr. Teo En Ming (Zhang Enming)
Singapore Citizen
Mobile Phone: +65 9117 5902



On 05/02/2015 01:04, Stephen Oberholtzer wrote:
> Brian,
>
> I have an AMD R7 250 successfully being passed through to a Windows
> 8.1 DomU (as well as a USB 3.0 root hub); here are some important
> details on how I did it:
>
> * I am not passing through the R7 as the primary graphics adapter.
>    Instead, it's passed through as an ordinary PCI device, with the
> main graphics adapter being "stdvga" (accessible via VNC).
>    Windows is configured to consider the R7 as its main display, and
> *not* to extend the display onto the virtual graphics adapter.
>
>    This allows me to use qemu-xen (or uptream) instead of qemu-xen-traditional.
>
> * Make sure you have Xen 4.5 and a recent version of qemu.
>    (You'll need to pull them from 'experimental' instead of just sid.)
>    Otherwise, there may not be enough address space reserved for the
> very large MMIO regions the GPU requires.
>    (This will show in Windows as a "code 12", something about not
> enough resources being available)
>
> * Make sure your card is not behind an NF200 chip (a popular chip used
> to allow multiple PCIe graphics cards several years ago).
>    The NF200 chip does not play well with passthrough.
>    From what I've gathered, the PLX PCIe switch chip is a proper PCIe switch.
>    I have an ASRock motherboard; from what I've gathered, they've got
> the most IOMMU-friendly hardware and software (BIOS).
>
> * Your graphics card almost certainly has separate functions for the
> GPU and for the HDMI audio circuitry.  Be sure to pass through both
> functions (e.g. 00:07.0 and 00:07.1)
>
> * Be sure to configure your kernel command line to hide the graphics
> card (using xen-pciback.hide)
>
> The result works very well; all I really lose is the ability to see
> early BIOS messages on the monitor (because they show up on the
> virtual card).
>
>
> > On 04/02/2015 00:54, Brian Paterni wrote:
> >
> > Hi all,
> <snip>
> > I'm trying to passthrough an AMD Radeon R9 285 to a windows domu, but so
> > far have had no luck.
> >
> > dom0 is debian unstable (linux 3.16, xen 4.4.1). Though with the
> > qemu-traditional device model removed in debian [1], gfx_passthru is
> > currently not possible with debian-provided packages (?)
> >
> > 1: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=776742
> >
> > As a result, I've begun to compile from source, but xen git master
> > results in the fallowing error message:
> >
> >     The kernel doesn't support reset from sysfs for PCI device
> >
> > Since the message lists the 'kernel', I thought it might have something
> > to do with the kernel in debian. So I compiled a linux kernel
> > (3.19.0-rc6+) from source. However I still experience the same error
> > message.
> >
> > Now I'm at a loss for what to try next. The r9 285 is a relatively new
> > gpu. In fact, there currenty is no FOSS drivers for for it (amdgpu has
> > yet to be released). Therefore, could the non-working gfx_passthru be
> > the result of missing bits in either the linux kernel or xen that have
> > yet to be dropped in? Or am I just 'doing it wrong'? The fact that the
> > r9 2xx family is listed as supported at [2] leads me to believe it's the
> > latter.
> >
> > 2:
> > http://wiki.xen.org/wiki/Xen_VGA_Passthrough_Tested_Adapters#ATI.2FAMD_display_adapters
> >
> > Attached should be some more information I thought to include. Let me
> > know if you need anything else.
> >
> >
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-users
> >
> >
> >
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-users


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