The only thing holding me back from fully migrating to Void was SSD caching 
using dm-cache.  when setting up my lvm configuration and rebooting, the 
system would get upset and drop to shell complaining that it didn't know 
the version of _cache_ kernel module. 

The problem was twofold:

1) had to force dm-cache kernel module to load in dracut.conf, dm-cache 
wouldn't load into initramfs without being forced.
2) file /etc/runit/core-services/03-filesystems.sh failed at "vgchange 
--sysinit -a y" as it needs the command cache_check, a symlink to 
pdata-tools

TL;DR - Solved the problem by forcing dracut to play along, and then 
installing thin-provisioning-tools from git.