<div dir="ltr">Hi Ruben,<div><br></div><div>lspci -k will show you which driver currently binds a device. The 'Kernel driver in use' should be vfio-pci for all devices you want to pass through.</div><div>I don't use the options on the -device vfio-pci arguments anymore. I just have <span style="color:rgb(0,0,0);font-family:monospace">-device vfio-pci,host=01:00.0 and </span><span style="font-family:monospace">-device vfio-pci,host=01:00.1. This seems to be totally fine.</span></div><div><span style="font-family:monospace"><br></span></div><div><span style="font-family:monospace">Regards</span></div><div><span style="font-family:monospace">Alex </span></div><span style="font-family:monospace">
<br></span></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jan 18, 2016 at 7:04 PM, Ruben Felgenhauer <span dir="ltr"><<a 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"><span class="">
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 href="https://wiki.debian.org/VGAPassthrough" target="_blank"></a><a href="https://wiki.debian.org/VGAPassthrough" target="_blank">https://wiki.debian.org/VGAPassthrough</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 href="https://bbs.archlinux.org/viewtopic.php?id=162768" target="_blank"></a><a 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<br>
<br>
<div>Am 18.01.2016 um 08:31 schrieb
Alexander Petrenz:<br>
</div>
</span><div><div class="h5"><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 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">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 href="https://bugzilla.kernel.org/show_bug.cgi?id=107561" rel="noreferrer" target="_blank">https://bugzilla.kernel.org/show_bug.cgi?id=107561</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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<br>
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</blockquote>
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