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A comment on Linux page table isolation is not needed on AMD processors. Parent comment

Re:Linux page table isolation is not needed on AMD processors by bonzini on Wednesday January 03, 2018 @01:07PM (#16063364)
MOV-to-CR3 is pretty slow, yes. In the ballpark of a hundred clock cycles, and you have to do 2 of them. The cost of a system call was about 1000 cycles, maybe less on newer processors---both OSes and processors optimize the hell out of SYSCALL/SYSRET.
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