linux-kernel - Re: Linux FSGSBASE testing

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Message-ID: <CALCETrVDfdKvNorB0Um7HBABK-U1NJLWTEu+kxzTXAWL_eZUVQ@mail.gmail.com>
Date:   Sat, 20 Jun 2020 09:20:50 -0700
From:   Andy Lutomirski <luto@...capital.net>
To:     LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Stas Sergeev <stsp@...t.ru>
Subject: Re: Linux FSGSBASE testing

On Sat, Jun 20, 2020 at 8:59 AM Andy Lutomirski <luto@...capital.net> wrote:
>

> 2. FSGSBASE off on a patched kernel.  Boot the same kernel as in #1
> but either pass nofsgsbase on the kernel command line or use pre-Ivy
> Bridge hardware.  You will *

You will not see fsgsbase in /proc/cpuinfo if you successfully
disabled fsgsbase.