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Hi,<br>
<br>
finally I had time to this again. I tried out virt-manager and after
a bit of playing around with it, it /somewhat/ worked:<br>
<br>
The machine is at least booting. I still have a standard vga card
enabled in the virt-manager config window.<br>
After the machine has booted, I can see that the device gets
recognized as 750ti.<br>
However, the gpu doesn't get used, because of 'Code 43'.<br>
Code 43 is a generic error, so any idea what it could mean in this
case?<br>
<br>
Of course I added the <kvm><hidden
state='on'/></kvm> lines at the associated position.<br>
<br>
Best regards,<br>
Ruben<br>
<br>
<div class="moz-cite-prefix">Am 18.01.2016 um 22:27 schrieb Will
Marler:<br>
</div>
<blockquote
cite="mid:CACjWF0RaenjOTxMFPyD1VATXUr2qevwo4eEq6ARZmodOxckW8w@mail.gmail.com"
type="cite">
<div dir="ltr">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).</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Mon, Jan 18, 2016 at 11:04 AM, Ruben
Felgenhauer <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:4felgenh@informatik.uni-hamburg.de"
target="_blank">4felgenh@informatik.uni-hamburg.de</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF"> Hi, Alex!<br>
<br>
Thanks for your reply!<br>
My GPU indeed has a seperate audio device located at
01:00.1.<br>
<br>
However, just adding -device vfio-pci,host=01:00.1 doesn't
seem to do the trick.<br>
Of course the corresponding device is already blacklisted
and bound to vfio.<br>
<br>
The Debian Wiki entry about VGA passthrough (<a
moz-do-not-send="true"
href="https://wiki.debian.org/VGAPassthrough"
target="_blank"><a class="moz-txt-link-freetext" href="https://wiki.debian.org/VGAPassthrough">https://wiki.debian.org/VGAPassthrough</a></a>)
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?<br>
<br>
On the same article, it says that the "HDMI soundcard
[...] needs to be unbound from its driver":<br>
# echo '0000:01:00.1' | sudo tee
/sys/bus/pci/devices/0000:01:00.1/driver/unbind<br>
I figured the vfio-bind script from the Arch Linux Forum
thread (<a moz-do-not-send="true"
href="https://bbs.archlinux.org/viewtopic.php?id=162768"
target="_blank">https://bbs.archlinux.org/viewtopic.php?id=162768</a>)
would do exactly this thing, so I didn't explicitly do so
for the audio device. Is that okay?<br>
<br>
Best regards,<br>
Ruben
<div>
<div class="h5"><br>
<br>
<div>Am 18.01.2016 um 08:31 schrieb Alexander Petrenz:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Hi Ruben,
<div><br>
</div>
<div>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.</div>
<div>Also I´m not quite sure, if you should remove
the x-vga=on.</div>
<div><br>
</div>
<div>Regards</div>
<div>Alex</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Sun, Jan 17, 2016 at
11:12 PM, Ruben Felgenhauer <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:4felgenh@informatik.uni-hamburg.de"
target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:4felgenh@informatik.uni-hamburg.de">4felgenh@informatik.uni-hamburg.de</a></a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0
0 0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">Hi,<br>
<br>
I am trying to pass my nVidia GTX 750ti to my
QEMU guest.<br>
<br>
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.<br>
<br>
This is how I start the vm with normal vga
emulation:<br>
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<br>
Everything runs fine in this case. To do the
passthrough, I add this:<br>
-device
vfio-pci,host=01:00.0,multifunction=on,x-vga=on
-vga none<br>
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.<br>
<br>
Obviously, I am using a BIOS installation and
I'm well-aware with this bug: <a
moz-do-not-send="true"
href="https://bugzilla.kernel.org/show_bug.cgi?id=107561"
rel="noreferrer" target="_blank"><a class="moz-txt-link-freetext" href="https://bugzilla.kernel.org/show_bug.cgi?id=107561">https://bugzilla.kernel.org/show_bug.cgi?id=107561</a></a>,
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.<br>
<br>
Host is Debian testing with QEMU 2.5.0.<br>
I tried both Debian and Windows 7 as a guest,
but both are showing exactly the same
behaviour.<br>
Mainboard is an ASUS Z87-PLUS. The 750ti is
produced by ASUS aswell.<br>
<br>
Any idea how I could get passthrough running?<br>
<br>
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