The KVM module in the kernel exposes the virtualized hardware through the /dev/kvm character device.

内核中的 KVM 通过 /dev/kvm 字符设备来公开虚拟化后的硬件。

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For excellent and sufficient reasons, its keys emitted not the character itself but a "scan code", which was then remapped to the hardware level, just as a compiler would.

有充分的理由支撑，它(IBM PC)的ESC键释出的不是字符本身，而是一个“扫描指令”。随后这个指令被映射至硬件层面，就像编译器所做的。

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When it is started by the ESC character itself (customarily just for hardware), or

当字符串以ESC字符本身开始时(习惯上是针对硬件)，或者

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