At least years ago, this feature was not available in XEN PV guests [1].Yes, as I understand it, the hugepages are not available in my Xen
guest.
Xen PV guests are strictly 4k-only.
Xen HVM guests (using normal VT-x/SVM hardware support) have all page
sizes available.
But lucky to find this thread. We've had several reports and no luck
isolating what changed.
~Andrew (Xen maintainer)