(x86 systems only) NPAGEXPVIR_S2 defines the maximum size to which
    NPAGEDYN_S2 can be increased in megabytes. If this value is too small,
    pool expansion will not take place, and SYSBOOT will adjust NPAGEDYN_S2
    DOWN to NPAGEXPVIR_S2.

    AUTOGEN limits its own calculated values for NPAGEDYN_S2 and
    NPAGEXPVIR_S2. These calculated values are adequate for most systems.
    If your system requires a larger value, you can override the
    AUTOGEN calculated values by setting higher values for
    MIN_NPAGEDYN_S2 and MIN_NPAGEXPVIR_S2 in MODPARAMS.DAT.

    NPAGEXPVIR_S2 has AUTOGEN and GEN attributes.