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

[Arjen]

On Tue, 2017-02-28 at 01:45 -0300, guidugli at gmail.com wrote:
> Arjen, you are a genius! That was the missing piece. I searched a lot
> in the internet and never come across this tip. I will update and
> close
> the ticket on launchpad so this can hopefully be seen by more people
> having the same problem.
> 
> Thank you very much for sharing!
> 
Glad to be of help.

Please note that (at least for me) adding the conf file disables
Wayland sessions in Gnome. And Xorg won't start without the passthrough
card. I haven't been able to hide the virtual VGA from Xorg.

If anyone knows a good solution for this, I'm all ears. But I guess
this is more of a Xorg config issue than a VFIO passthrough thing.

> 
> On Sun, 2017-02-26 at 16:03 +0100, Arjen wrote:
> > 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-
> at
> > > > > i/
> > > > > +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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