.. toc::
CREDIT:
这篇文章基本上是根据 kvm interrupt emulation 完成的，这其中有一些细节在原文中没有详细讲到，因此就有了本篇文章。
名词解释
Interrupt Service Routing (ISR)
a special function or block of code that executes in response to an interrupt. When an interrupt occurs, the processor temporarily stops normal execution, jumps to the ISR (using the interrupt vector), executes it.
Interrupt line
