| Date | Fri, 9 Feb 2018 20:11:12 +0100 | From | Joerg Roedel <> | Subject | Re: [PATCH 00/31 v2] PTI support for x86_32 |
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Hi Andy,
On Fri, Feb 09, 2018 at 05:47:43PM +0000, Andy Lutomirski wrote: > 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."
Thanks for your review. I can add this warning, but I just hope that not a lot of people will actually see it :)
Joerg
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