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

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Message-ID: <6144aefc-767f-ff36-b424-f63f4bd4c579@linux.intel.com>
Date:   Thu, 11 Jan 2018 11:17:01 -0800
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        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>,
        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 01/11/2018 11:07 AM, Borislav Petkov wrote:
> On Thu, Jan 11, 2018 at 10:57:51AM -0800, Dave Hansen 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.
> You mean this:
> 
> https://git.kernel.org/tip/87590ce6e373d1a5401f6539f0c59ef92dd924a9

I meant that works across all the kpti implementations.  Those with gunk
in /sys, /proc/cpuinfo, or with nothing at all like the original KAISER
patches I posted.

And, yes, I want a pony.  I just though someone had such a pony handy
and it was trivial.