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I used bochs for debugging in SMP situation. The initialization of AP was OK, but the BSP will not receive any interrupt from outside.
However, when I throw my OS to VMware, the OS ran perfectly. Four cores can both have a running process on it, and the interrupts from mouse and keyboard worked fine as well. What is wrong with my code/bochs?

Unfortunately my crystal ball is broken, so the Bochs log, the Bochs debugger and your source code are at the moment a better source of information what's going wrong in your SMP implementation.

The problem fixed. 'cuz Bochs invoke PIT fastly but excute slowly, my code auto sets the APIC's timer initial count registers to a small number. When I hard code the number, the issue fixed.