[vfio-users] VM doesn't boot, hangs with R9 Fury passthrough

[José Ramón Muñoz Pekkarinen]

	Hi Matti,

	I had similar results on this, using an HD5670, and a windows 7 guest 
installed on top of ovmf. No signal in the input, nothing extrange from qemu, 
and no specific error in /var/log/messages, but the host becomes unresponsive 
enough that I usually have to hard reset it.

	I though tried the same setup using seabios and, when the vm decides to 
boot correctly, it works quite well, and I can play something. The only 
problem is that you'll probably have to setup windows again to work with old 
fashion bios.

	I hope it helps.

	José. 

On Saturday 29 August 2015 21:29:10 Matti Niemenmaa wrote:
> Hello all,
> 
> I'm trying to passthrough an AMD Radeon R9 Fury to a Windows 10 guest,
> but the VM doesn't seem to work at all when I tell qemu to add the
> vfio-pci device. No errors of any kind are output anywhere that I can see.
> 
> Possibly relevant hardware and software versions:
> 
> Motherboard: Asus X99-A
> CPU:         Intel Core i7-5930k
> GPU host:    AMD Radeon R9 270X
> GPU guest:   AMD Radeon R9 Fury
> Linux 4.1.6 (I also tried 4.2-rc8 with the same results)
> QEMU 2.4.0
> edk2.git-ovmf-x64-0-20150804.b1143.g8ca1489
> 
> The following command successfully boots the VM with emulated VGA
> graphics and working audio and networking (modulo some audio distortion,
> which I haven't bothered looking into yet):
> 
> qemu-system-x86_64
>    -nodefconfig -serial none -parallel none -nodefaults -name The-Windows
>    -enable-kvm -cpu host -smp sockets=1,cores=6,threads=2 -m 16G
>    -soundhw hda
>    -drive
> if=pflash,format=raw,readonly,file=.../edk2.git/ovmf-x64/OVMF_CODE-pure-efi.
> fd -drive if=pflash,format=raw,file=.../windows-ovmf-vars.fd
>    -drive if=virtio,format=raw,file=.../windows.img,index=0,cache=none
>    -rtc base=localtime
>    -net nic,model=virtio -net bridge,br=br0
>    -alt-grab
>    -boot order=c
>    -vga std
> 
> But replacing the last option, "-vga std", with the following, doesn't
> work at all as intended:
> 
>    -device vfio-pci,host=02:00.0,addr=06.0
> 
> The monitor the Fury is plugged into doesn't receive a signal, nor does
> anything show up in the window opened by qemu, so there's no visual
> feedback at all. It appears that Windows doesn't even start, since I
> can't connect to it over VNC despite that working when "-vga std" is
> used. As far as I can tell the VM hangs indefinitely at this point.
> 
> qemu doesn't report any errors (in fact it outputs nothing), nor is
> there anything relevant-looking in dmesg.
> 
> I'm at a loss as to how to proceed. Any assistance would be welcomed.
> 
> — Matti
> 
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