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[vfio-users] Guest does not boot OS with GPU passed through, stuck at TianoCore boot splash



Hello there!
 
I am trying to set up a PCI passthrough for my graphics card. I followed the instructions on vfio.blogspot.com and used vfio-pci and OVMF, and so far everything seemed to work fine. When I now try to start the VM with my graphics card passed through, though, it shows the TianoCore boot splash (with the successfull memory test notice on the bottom) on the monitor connected to the card and stops there. I tried waiting for quite a while, but it is stuck at this boot splash. If I remove the PCI devices from the VM, the OS boots without problems.
 
I don't see any error messages in any of the relevant logs I can think of (libvirt log, dmesg, virt-manager itself). The only line showing up in the libvirt log (/var/log/libvirt/qemu/...) is the following:
 
2016-04-10 10:45:08.461+0000: starting up libvirt version: 1.3.2, package: 0~15.10~ppa0 (Jacob Zimmermann <ppa jzimm net> Fri, 04 Mar LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin QEMU_AUDIO_DRV=spice /usr/bin/kvm-spice -name xubuntu2 -S -char device redirected to /dev/pts/9 (label charserial0)
 
I don't really have an idea what the problem could be, especially since there are no errors showing up. I am using an Intel Core i5-3470, a Sapphire HD 7850 (AMD) and Xubuntu 15.10 on the host. I installed all the relevant tools from a PPA by Jacob Zimmermann in order to get more recent versions of qemu, virt-manager and the likes.
 
One thing I should note is that the ROM of my graphics card does not support UEFI out of the box. As it is, the passthrough did not work at all; there was nothing showing up on the monitor connected to the card. I found a ROM from a similar model by Gigabyte that supports UEFI, though, and passed it to the VM. Now the monitor shows the TianoCore boot splash, but stops there. Could this be the problem? I would think that it should work this way, though, as the boot splash is already passed to the card; otherwise there would be nothing showing up on the monitor, right?

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