virtio opens up new opportunities for efficiency in paravirtualized I/O environments while building from previous work in Xen.
virtio 为提高半虚拟化 I/O 环境中的效率带来了新的机会，同时能够利用 Xen 以前的成果。
Modified operating systems use the "hypercalls" supported by the paravirtualized hypervisor to interface directly with the hardware.
经修改的操作系统通过泛虚拟的hypervisor所支持的“超级调用（hypercalls）”直接与硬件打交道。
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