continue supporting scsi drives in buster
In qemu > 2.12 (e.g. buster), you can no longer use if=scsi
. So any virtual guest using HDA_DRIVER=scsi will fail with:
machine type does not support if=scsi,bus=0,unit=1
The explanation for why is available and so is a helpful post with suggestions on a work-around.
The fix does not seem trivial.