Hi,
finally I had time to this again. I tried out virt-manager and after a
bit of playing around with it, it /somewhat/ worked:
The machine is at least booting. I still have a standard vga card
enabled in the virt-manager config window.
After the machine has booted, I can see that the device gets recognized
as 750ti.
However, the gpu doesn't get used, because of 'Code 43'.
Code 43 is a generic error, so any idea what it could mean in this case?
Of course I added the <kvm><hidden state='on'/></kvm> lines at the
associated position.
Best regards,
Ruben
Am 18.01.2016 um 22:27 schrieb Will Marler:
I'm not sure what correct command-line syntax is. Have you tried using
libvirt and VirtManager to handle your VM rather than command line,
and modifying the XML rather than the command line? I think that's
generally the preferred method these days (it's certainly easier from
my point of view, and the way I got my 750 Ti to pass through).
On Mon, Jan 18, 2016 at 11:04 AM, Ruben Felgenhauer
<4felg...@informatik.uni-hamburg.de
<mailto:4felg...@informatik.uni-hamburg.de>> wrote:
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?
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