kexec_load failed: Function not implemented
kexec fails to load a new kernel. I was able to reproduce this with kexec-tools (2.0.16-r0) on linux-vanilla (4.14.13-r2), linux-hardened (4.9.73-r0), linux-virt (4.14.13-r2) and linux-virthardened (4.9.7-r0).
(from redmine: issue id 8400, created on 2018-01-12, closed on 2018-03-14)