linux-kernel - Re: [RFC PATCH v2 6/6] x86/entry/pti: don't switch PGD on when pti

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Message-ID: <CA+55aFyu8Om2DpoDCihHZ1Y-ibPv=O=qNtsHXT=KPtTiPwmaSg@mail.gmail.com>
Date:   Thu, 11 Jan 2018 11:12:23 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Andy Lutomirski <luto@...nel.org>, Willy Tarreau <w@....eu>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Brian Gerst <brgerst@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [RFC PATCH v2 6/6] x86/entry/pti: don't switch PGD on when
 pti_disable is set

On Thu, Jan 11, 2018 at 10:57 AM, Dave Hansen
<dave.hansen@...ux.intel.com> wrote:
>
> I'd love to have a tool that tells you for sure "KPTI enabled or not",
> but I'd also love to have it be something I can easily distribute
> without it being handled like a WMD.

As Josh points out, the whole meltdown excitement actually already
generated a number of projects that aren't the attack, but show some
of the effects.

But Thomas does have a whole sysfs series to show "mitigation status
for various hardware bugs".

           Linus