linux-kernel - Re: [PATCH 0/3] PTI for x86-32 Fixes and Updates

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Message-ID: <f654c085-d07c-5047-0d59-e2f88b00e921@intel.com>
Date:   Mon, 23 Jul 2018 15:07:13 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>, Pavel Machek <pavel@....cz>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Peter Anvin <hpa@...or.com>,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Andrew Lutomirski <luto@...nel.org>,
        Jürgen Groß <jgross@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>, Jiri Kosina <jkosina@...e.cz>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Brian Gerst <brgerst@...il.com>,
        David Laight <David.Laight@...lab.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Eduardo Valentin <eduval@...zon.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Will Deacon <will.deacon@....com>,
        "Liguori, Anthony" <aliguori@...zon.com>,
        Daniel Gruss <daniel.gruss@...k.tugraz.at>,
        Hugh Dickins <hughd@...gle.com>,
        Kees Cook <keescook@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Waiman Long <llong@...hat.com>,
        "David H . Gutteridge" <dhgutteridge@...patico.ca>,
        Joerg Roedel <jroedel@...e.de>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH 0/3] PTI for x86-32 Fixes and Updates

On 07/23/2018 02:59 PM, Josh Poimboeuf wrote:
> On Mon, Jul 23, 2018 at 11:38:30PM +0200, Pavel Machek wrote:
>> But for now I'd like at least "global" option of turning pti on/off
>> during runtime for benchmarking. Let me see...
>>
>> Something like this, or is it going to be way more complex? Does
>> anyone have patch by chance?
> RHEL/CentOS has a global PTI enable/disable, which uses stop_machine().

Let's not forget PTI's NX-for-userspace in the kernel page tables.  That
provides Spectre V2 mitigation as well as Meltdown.