other: 0.963
device: 0.921
semantic: 0.805
mistranslation: 0.681
graphic: 0.661
instruction: 0.626
boot: 0.521
network: 0.503
assembly: 0.402
socket: 0.270
vnc: 0.243
KVM: 0.237

-blockdev option missing host_device documenation and command line help support
Additional information:
We recommend -blockdev in the documentation as the preferred way to configure storage backends but the online help isn't useful. We also seem to be missing information for some of the blockdev drivers, for example host_device.