[vfio-users] R9 290 Passthrough not working on Linux

[Arjen]

On Sun, 2017-02-26 at 11:43 -0300, guidugli at gmail.com wrote:
> Thank you for your reply.
> 
> I have a Core i7 4770 running on ASROCK Fatal1ty Z87 Professional,
> 32GB RAM, Sapphire Tri-X R9 290.
> 
> I tried using OVMF too and had same results, unfortunately. Windows
> works fine but Linux do not.
> 
I had problems passing through (an older) Radeon to Ubuntu as well.
I got it working with machine model q35 (for PCIe, otherwise drm would
crash) but putting the card on a PCI bus (otherwise radeon would crash)
 IIRC.

However, I also needed a configuration file to tell Xorg which card to
use (using SeaBIOS, it required a virtual VGA also). I did not see such
a file in your bug report, so maybe this helps you.

I added a 20-radeon.conf file to /usr/share/X11/xorg.conf.d with this
contents (changed to match your card on 1:0:0):
Section "Device"
  Identifier "Passthrough"
  Driver "radeon"
  BusID "PCI:1:0:0"
EndSection

Otherwise, Xorg would use the QXL virtual card and not my passthrough
Radeon.

Hopefully this helps you too.

> On Sun, 2017-02-26 at 03:15 +0100, Tomáš M. wrote:
> > What is your HW?
> > 
> > I would recommend trying the whole thing on Arch Linux using this h
> > ttps://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF
> > 
> > Although I don't have experience with OVMF, using seabios happily
> > with RX480.
> > 
> > On Sat, Feb 25, 2017 at 8:59 PM, <guidugli at gmail.com> wrote:
> > > Hi,
> > > 
> > > For quite some time I have been able to do a pass-through of R9
> > > 290 to
> > > Windows VMs using KVM. The problem is that I tried to use Linux
> > > and it
> > > does not work. Tried Fedora and Ubuntu and both did not work.
> > > Funny
> > > thing is that Ubuntu startup/shutdown screens show on the
> > > secondary
> > > monitor but not the system itself.
> > > 
> > > I tried using i440FX and Q35, same results. Used the same
> > > configuration
> > > I use for my working Windows VMs.
> > > 
> > > I had opened a but few months ago but no answer so far.
> > > https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/
> > > +bug/1
> > > 633777
> > > 
> > > I just wonder if someone was able to bypass this problem or has
> > > some
> > > suggestion.
> > > 
> > > Thank you,
> > > 
> > > Carlos
> > > 
> > > _______________________________________________
> > > vfio-users mailing list
> > > vfio-users at redhat.com
> > > https://www.redhat.com/mailman/listinfo/vfio-users
> > > 
> 
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