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Is there a way to disable KPTI (for meltdown mitigation) once the system is already up and running?

If the system is not yet booted, is it correct that passing kernel command line argument "nopti" will disable the page tables isolation?

Jack
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    See this: https://askubuntu.com/questions/991874/how-to-disable-page-table-isolation-to-regain-performance-lost-due-to-intel-cpu – pomsky Jan 19 '18 at 14:16
  • @pomsky reported link talks about second question, but it leaves me not satisfied. Some reports nopti some reports pti=off. I was looking for a definitive answer – Jack Jan 19 '18 at 15:37
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    @Jack - That is the definitive answer . Both options, nopti and pti=off, do the exact same thing, they only difference is syntax or the number of keys you type for the option you want. It is similar to long and short options, ls -a is the same output as ls --all – Panther Jan 19 '18 at 16:11
  • Sorry @Panther - pomsky Zanna WinEunuuchs2Unix N0rbert - but main question is not answered. Why have you mark this question as duplicate? – Jack Jan 21 '18 at 19:56
  • No, reboot is required – Panther Jan 21 '18 at 20:12
  • @Panther You may want to add this as a normal answer and let me accept it – Jack Jan 22 '18 at 14:44

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