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Update ch9 2device-driver-2.rst
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source/chapter9/2device-driver-2.rst

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@@ -261,7 +261,7 @@ virtqueue由三部分组成(如下图所示):
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**3. I/O完成过程:(设备执行)**
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3.1 virtio设备通过 `kick` 机制(知道有新的I/O请求,通过访问可用环的idx指针,解析出I/O请求;
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3.1 virtio设备通过 `kick` 机制知道有新的I/O请求,通过访问可用环的idx指针,解析出I/O请求;
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3.2 根据I/O请求内容完成I/O请求,并把I/O操作的结果放到I/O请求中相应的buffer中;
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