[vfio-users] GPU passthrough to Windows problem: BOOT_DEVICE_INACCESSIBLE & general questions on passing physical disks

[Benjamin Slade]

I've been trying to set up a machine running Arch which allows Windows
to be run as a virtualised process with GPU-passthrough according to the
method laid out here:
https://www.reddit.com/r/linuxmasterrace/comments/3lnorm/gpu_passthrough_revisited_an_updated_guide_on_how/

The actual passthrough part I've navigated, but I'm having trouble
figuring out how to properly pass devices through to the VM. Here's what
I have:

  #!/bin/bash

  cp /usr/share/edk2.git/ovmf-x64/OVMF_VARS-pure-efi.fd /tmp/my_vars.fd
  QEMU_PA_SAMPLES=128 QEMU_AUDIO_DRV=pa
  qemu-system-x86_64 \
  -enable-kvm \
 -m 2048 \
 -smp cores=4,threads=1 \
 -cpu host,kvm=off \   
 -vga none \
 -soundhw hda \
 -usb -usbdevice host:046d:c52b -usbdevice host:0781:5530 \
 -device vfio-pci,host=02:00.0,multifunction=on \
 -device vfio-pci,host=02:00.1 \
 -drive if=pflash,format=raw,readonly,file=/usr/share/edk2.git/ovmf-x64/OVMF_CODE-pure-efi.fd \
 -drive if=pflash,format=raw,file=/tmp/my_vars.fd \
 -device virtio-scsi-pci,id=scsi \
 -drive file=/dev/sda,id=disk,format=raw,if=none -device ide-hd,drive=disk \
 -drive file=/home/emacsomancer/kvm/virt-stable.iso,id=virtiocd,if=none,format=raw -device ide-cd,bus=ide.1,drive=virtiocd \
 -drive file=/dev/sdc,id=disk2,format=raw,if=none -device scsi-hd,drive=disk2 \
 -drive file=/dev/sdd,id=disk3,format=raw,if=none -device scsi-hd,drive=disk3 \
 -boot menu=on

When I try this, it ends up booting off the RedHat VirtIO .iso, and
eventually the Windows symbol appears and the spin-y circle spins for a
while, and then it complains "BOOT_DEVICE_INACCESSIBLE".

So, It seems unable to see the other drives I've passed. These are
physical hard drives (I'm not sure if I'm passing them correctly,
esp. as the VM doesn't seem to be seeing them). They are indeed on
/dev/sda, /dev/sdc, and /dev/sdd, respectively. I can properly boot off
of /dev/sda/ where Windows is installed.

I've fiddled with this for quite some time, and haven't made any
headway.