Robert Wing edfb339d38 bhyve/snapshot: switch to nvlist for snapshot requests
Switch to using an nvlist with nvlist_send()/nvlist_recv() to
communicate from bhyvectl(8) to bhyve(8).

The idea is that a bhyve process receives a command with with a set of
arguments. The nvlist here is structured to reflect that premise.

For example, to snapshot the vm, the expected nvlist looks like:

    { cmd=START_CHECKPOINT, filename="filename" }

Reviewed by:	markj
Differential Revision:	https://reviews.freebsd.org/D33977
2022-02-09 08:11:57 -09:00
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