| From | Andy Lutomirski <> | Date | Fri, 9 Feb 2018 17:47:43 +0000 | Subject | Re: [PATCH 00/31 v2] PTI support for x86_32 |
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On Fri, Feb 9, 2018 at 9:25 AM, Joerg Roedel <joro@8bytes.org> wrote: > Hi, > > here is the second version of my PTI implementation for > x86_32, based on tip/x86-pti-for-linus. It took a lot longer > than I had hoped, but there have been a number of obstacles > on the way. It also isn't the small patch-set anymore that v1 > was, but compared to it this one actually works :)
One thing worth noting is that performance of this whole series is going to be abysmal due to the complete lack of 32-bit PCID. Maybe any kernel built with this option set that runs on a CPU that has the PCID bit set in CPUID should print a big fat warning like "WARNING: you are using 32-bit PTI on a 64-bit PCID-capable CPU. Your performance will increase dramatically if you switch to a 64-bit kernel."
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