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

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Message-ID: <27a0082c-fadb-792a-740e-70932d51f1b5@linux.intel.com>
Date:   Thu, 15 Feb 2018 16:21:12 -0800
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     Nadav Amit <namit@...are.com>, Ingo Molnar <mingo@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Willy Tarreau <w@....eu>, Nadav Amit <nadav.amit@...il.com>,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC v2 0/6] x86: Disabling PTI in compatibility mode

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?