Hi, Alex!
Thanks for your reply!
My GPU indeed has a seperate audio device located at 01:00.1.
However, just adding -device vfio-pci,host=01:00.1 doesn't seem to do
the trick.
Of course the corresponding device is already blacklisted and bound to vfio.
The Debian Wiki entry about VGA passthrough
(https://wiki.debian.org/VGAPassthrough) mentions QEMU arguments like
"-device
vfio-pci,host=01:00.0,bus=root.1,addr=00.0,multifunction=on,x-vga=on,romfile=...
-device vfio-pci,host=01:00.1,bus=pcie.0" which seems to address GPUs
with audio devices, but if I try to do something similar, the buses
'root' and 'pcie' couldn't be found. Maybe I missed something very
important?
On the same article, it says that the "HDMI soundcard [...] needs to be
unbound from its driver":
# echo '0000:01:00.1' | sudo tee
/sys/bus/pci/devices/0000:01:00.1/driver/unbind
I figured the vfio-bind script from the Arch Linux Forum thread
(https://bbs.archlinux.org/viewtopic.php?id=162768) would do exactly
this thing, so I didn't explicitly do so for the audio device. Is that okay?
Best regards,
Ruben
Am 18.01.2016 um 08:31 schrieb Alexander Petrenz:
Hi Ruben,
I guess your 750ti also has some audio device. You should pass through
this too. It should be something like 01:00.1. There are many command
line examples you can find about that.
Also I´m not quite sure, if you should remove the x-vga=on.
Regards
Alex
On Sun, Jan 17, 2016 at 11:12 PM, Ruben Felgenhauer
<4felg...@informatik.uni-hamburg.de
<mailto:4felg...@informatik.uni-hamburg.de>> wrote:
Hi,
I am trying to pass my nVidia GTX 750ti to my QEMU guest.
Problem is: After the QEMU monitor pops up, nothing happens. The
GPU's output is dead, and the vm won't be accessible via SSH
anymore, so it's very likely that the VM isn't booting up at all.
Also, there are no error messages from QEMU on the console
whatsoever which makes debugging it especially hard.
This is how I start the vm with normal vga emulation:
qemu-system-x86_64 -hda vm.ovl -boot c -enable-kvm -m 1024 -cpu
host,kvm=off -smp cores=4,threads=2 -redir tcp:5022::22
Everything runs fine in this case. To do the passthrough, I add this:
-device vfio-pci,host=01:00.0,multifunction=on,x-vga=on -vga none
This brings said problems with it. I also tried out multiple
different combinations of -device's arguments or even adding a
romfile for the GPU, but none of these steps changed anything at all.
Obviously, I am using a BIOS installation and I'm well-aware with
this bug: https://bugzilla.kernel.org/show_bug.cgi?id=107561, but
neither using less RAM (as you can see I am using 1GB now) nor
switching to an older Kernel changed anything about the problem. I
have tried Kernel 4.1.0 and 4.3.0.
Host is Debian testing with QEMU 2.5.0.
I tried both Debian and Windows 7 as a guest, but both are showing
exactly the same behaviour.
Mainboard is an ASUS Z87-PLUS. The 750ti is produced by ASUS aswell.
Any idea how I could get passthrough running?
_______________________________________________
vfio-users mailing list
vfio-users@redhat.com <mailto:vfio-users@redhat.com>
https://www.redhat.com/mailman/listinfo/vfio-users
_______________________________________________
vfio-users mailing list
vfio-users@redhat.com
https://www.redhat.com/mailman/listinfo/vfio-users
