linux-kernel - Re: [PATCH] x86/speculation: Add document to describe Spectre and its mitigations

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Message-ID: <20181228103437.4c03c181@lwn.net>
Date:   Fri, 28 Dec 2018 10:34:37 -0700
From:   Jonathan Corbet <corbet@....net>
To:     Tim Chen <tim.c.chen@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jiri Kosina <jikos@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Jon Masters <jcm@...hat.com>,
        Waiman Long <longman9394@...il.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
        x86@...nel.org, stable@...r.kernel.org
Subject: Re: [PATCH] x86/speculation: Add document to describe Spectre and
 its mitigations

On Fri, 21 Dec 2018 09:44:44 -0800
Tim Chen <tim.c.chen@...ux.intel.com> wrote:

> Andi and I have made an update to our draft of the Spectre admin guide.
> We may be out on Christmas vacation for a while.  But we want to
> send it out for everyone to take a look.
> 
> Thanks.
> 
> Tim
> 
> From: Andi Kleen <ak@...ux.intel.com>
> 
> There are no document in admin guides describing
> Spectre v1 and v2 side channels and their mitigations
> in Linux.
> 
> Create a document to describe Spectre and the mitigation
> methods used in the kernel.
> 
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> Signed-off-by: Tim Chen <tim.c.chen@...ux.intel.com>
> ---
>  Documentation/admin-guide/spectre.rst | 502 ++++++++++++++++++++++++++++++++++
>  1 file changed, 502 insertions(+)
>  create mode 100644 Documentation/admin-guide/spectre.rst

I only saw this now, seems I wasn't copied... I'll take a deeper look, but
I have a couple of meta comments:

 - This could arguably go in the security book rather than the admin
   guide.  I don't really have a strong opinion on which is right at the
   moment, but others might.

 - Wherever it ends up, can you also please add it to the appropriate
   index.rst file so it actually gets built with the rest of the docs?

Thanks,

jon