Re: [PATCH RFC v2 0/6] x86: Disabling PTI in compatibility mode

[Dave Hansen]

On 02/15/2018 08:35 AM, Nadav Amit wrote:
> I removed the PTI disabling while SMEP is unsupported, although I
> must admit I did not fully understand why it is required.

Do you mean you don't fully understand how PTI gives SMEP-like behavior
on non-SMEP hardware?