How to create a PVH guest on a Debian host?

[Name Here <safir@xxxxxxxxxxxxx>]

Hello. I just joined the list and there isn't much information on the
web page, so I can only hope this is the right place to seek technical
assistance. 

I've set Xen up on a Debian Bullseye host according to the following
tutorial: https://wiki.xenproject.org/wiki/Xen_Project_Beginners_Guide

Now I'm ready to create a guest, and I haven't found much information on
how to make a PVH guest. The best thing I've found is this brief
description of editing some config files:
https://pub.nethence.com/xen/pvh

Honestly I'm not even sure PVH is what I want; I just want something
that's going to be light on RAM and not slow (I'll be  running from
USB), but I haven't found many comparisons of PV, PVHVM, etc. that are
understandable. But PVH has been described as the most efficient.