Thank you for your answering
I think some instruction will mask the interrupt by default (such as, SYSCALL, INT 3 ) and it will enable the interrupt by their handler through sti.
In my experiment, the PMI is not occurred instantly even i set the PMC for far branch, and the PMI is delayed until STI is executed in KiSystemCall64
for my understanding , the PMI is masked by SYSCALL util the STI is executed , that's why PMI delayed
Please correct me if I'm wrong .
Thanks a lot ~