linux-kernel - Re: [PATCH] x86/speculation/l1tf: suggest what to do on systems with too much RAM

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Message-ID: <20180823200520.GW29735@dhcp22.suse.cz>
Date:   Thu, 23 Aug 2018 22:05:20 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Vlastimil Babka <vbabka@...e.cz>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...el.com>, stable@...r.kernel.org
Subject: Re: [PATCH] x86/speculation/l1tf: suggest what to do on systems with
 too much RAM

On Thu 23-08-18 12:38:33, Andi Kleen wrote:
> > There are people who care about L1TF mitigations. I am not going to
> > question their motivation. In any case a hint how to make the mitigation
> > active again sounds more useful than something that sounds as scary as
> > "you are vulnerable".
> 
> FWIW an early version of these patches automatically limited the available
> memory, but Linus pointed out that people likely prefer their memory.

Nobody is questioning that. The point is to give them a hint on how to
make the mitigation active again without going to call for help. The
message does tell them how to _enable_ it and point them to the
documentation on how to _decide_.
-- 
Michal Hocko
SUSE Labs