Real-mode programs freely execute CLI and STI to control interrupts, PUSHF and POPF to manipulate flags, INT n for DOS and BIOS calls, and IN/OUT for hardware I/O. In normal protected mode, these instructions are privilege-checked -- they execute normally if the caller has sufficient privilege, and fault otherwise. The 386 can't simply let V86 tasks execute them freely -- a DOS program disabling interrupts would bring down the whole system -- but trapping on every INT 21h call would make V86 impractically slow.
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第二十八条 有下列行为之一，扰乱体育、文化等大型群众性活动秩序的，处警告或者五百元以下罚款；情节严重的，处五日以上十日以下拘留，可以并处一千元以下罚款：
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