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> 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> > 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> > 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> 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 >> https://www.redhat.com/mailman/listinfo/vfio-users >> > > > > _______________________________________________ > vfio-users mailing list > vfio-users@redhat.com > https://www.redhat.com/mailman/listinfo/vfio-users > >
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