Re: [PATCH 00/31 v2] PTI support for x86_32

[Joerg Roedel]

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