At the suggestion of Hannes, I would like to try to make mhvtl work with tcmu-runner. Mhvtl is a tape-drive emulation package, which emulates various types of tapes drives and tape robot units (for loading drives). This package was originally based on the kernel debug SCSI driver, and still has a kernel component. This kernel component talks to user-space via a special character device.

It would be nice to take away the kernel component, so that it's easier to compile and use this package, since the current mhvtl kernel driver has not been merged upstream so has to be supplied as a KMP. [And KMPs are evil.]