The reference guest needs the hwinfo call

The reference guest is missing the hwinfo call. This simply returns the the memory and cpu count on the host, as part of the mgmt api's hwinfo call.

On the guest the call is called "get_hwinfo" and returns a dictionary with the following values:
"mem_total": The total memory of the compute instance, as determined by checking the "MemTotal" line of /proc/meminfo.
"num_cpus": The cpu count as determined by checking /proc/cpuinfo.