hvm tap vs vif




PV虚机只有一个vifX.N，而HVM虚机不安装PV Driver的时候会有两个网络接口vifX.N和tapX.N，而且实际上使用的是tapX.N。




HVM虚机安装PV Driver并重启后，tapX.N会消失，使用vifX.N（若不重启还是使用tapX.N）




tap interfaces -> qemu-emulated NICs (realtek model by default), used 

when no PV drivers installed (using OS' own driver for that model) 


vif interfaces (the one that you can rename) -> xen network frontend 

NICs, used when you have PV drivers installed (like GPLPV,