> А bhyve умеет лимитировать ресурсы?

Да.

https://www.freebsd.org/cgi/man.cgi?query=bhyve&sektion=8

     -c    numcpus     Number    of guest virtual CPUs.    The default is 1 and the maxi-
         mum is    16.

     -m    size[K|k|M|m|G|g|T|t]
         Guest physical    memory size in bytes.  This must be the    same
         size that was given to    bhyveload(8).

         The size argument may be suffixed with    one of K, M, G or T
         (either upper or lower    case) to indicate a multiple of    kilo-
         bytes,    megabytes, gigabytes, or terabytes.  If    no suffix is
         given,    the value is assumed to    be in megabytes.

     -p    vcpu:hostcpu
         Pin guest's virtual CPU vcpu to hostcpu.