Hello Michael, Looks like to use a new flag requires more time/work. I am thinking whether we can just use HIGHDMA flag to enable zero-copy in macvtap to avoid the new flag for now since mavctap uses real NICs as lower device? Thanks Shirley -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html