I noticed that bhyve can now run unprivileged as of freebsd/freebsd-src@af099ea .
However when I try to run the regression suite with the bhyve hypervisor with this tool I am still asked for sudo password. My guess is that bhyvectl has not been converted yet to work unprivileged ? (Once that happens you would need to make adjustments to this tool also I guess)
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P.S. Thanks for this tool. I saw your presentation on YouTube about this tool. It's really helping me dive into FreeBSD development. The integration with gdb is awesome.