PVH feature omission

[Elliott Mitchell <ehem+xen@xxxxxxx>]

>From tools/libs/light/libxl_x86.c: libxl__arch_passthrough_mode_setdefault()

"passthrough not yet supported for x86 PVH guests\n"

So PVH is recommended for most situations, but it is /still/ impossible
to pass hardware devices to PVH domains?  Seems odd this has never been
addressed with how long PVH has been around.

The other tools omission I noticed is it appears `xl` has no support for
pvSCSI?  Might be infrequently used, but seems similarly valuable for
domains focused on handling storage.


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