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

Dear Brian Paterni,

The following entry in the Xen Wiki page that you have listed is added by me.

AMD Radeon R9 200 family, Xen 4.2, Linux kernel 3.4.9 (reported by Kelly Zytaruk, AMD Engineer)

I have not touched Xen VGA Passthrough for many many months now, but if I am not wrong, it is OKAY to get the following message.

The kernel doesn't support reset from sysfs for PCI device

I can still successfully pass through my AMD Radeon HD 6450 to my Windows HVM domU with the ABOVE message.

AMD Radeon HD6450, as secondary adapter, Xen 4.4.1, xl toolstack, Ubuntu 14.04 LTS dom0, Linux Kernel 3.16.1 in dom0, Windows 7 Ultimate 64-bit HVM domU, Windows 8.1 Enterprise 64-bit HVM domU, Catalyst Control Center Installed (reported by Teo En Ming)

Do read and follow my Xen VGA Passthrough with AMD Display Cards installation guide at the following link.

Yours sincerely,

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

On 04/02/2015 00:54, Brian Paterni wrote:
Hi all,

I posted this message to xen-users yesterday, but I haven't seen it
listed in the archives, so I'm thinking it may have been lost in the
ether somewhere. Trying again while subscribed to the list. Hopefully
this mail makes it through...

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

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


Attached should be some more information I thought to include. Let me
know if you need anything else.

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