Ok, this is all good when the tasks slice doesn’t escape. But what if
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The solution is trap-and-emulate, the same principle later generalized in hardware virtualization extensions. V86 mode adds a special rule: since V86 tasks always run at CPL=3, if the OS sets IOPL，更多细节参见同城约会
This story was originally featured on Fortune.com，这一点在同城约会中也有详细论述