Additional subcommands for xm:

xm npiv-add <domid> <virtual port WWN> <virtual node WWN> \
		<physical port WWN[, physical port WWN...]>


Add the virtual port WWN and associated virtual node WWN to the domain
specified by domid, along with candidate physical ports where the
virtual port could be created on.

xm npiv-mod <domid> <virtual port WWN> <virtal node WWN> \
	<physical port WWN[, physical port WWN...]>

Modify the virtual node WWN and physical port WWN list with the
specified virtual port WWN.

xm npiv-rm <domid> <virtual port WWN>

Remove the virtual port WWN from the domain specified by domid.

xm npiv-bind <domid> <virtual port WWN> <auto_attach>

Create the specified virtual port on the first available physical port.

xm npiv-unbind <domid> <virtual port WWN> <force>

Delete the specified virtual port and associated storage devices from
the domain.

xm npiv-list <domid>

List all the virtual port WWN set on the domain along with:
	virtual node WWN
	WWN list of candidate physical ports
	physical port where the virtual port is created on, if any
	storage over the virtual port, if any, 
	and attach them to the domain if auto_attach is set