linux-kernel - Re: l1tf: Kernel suggests I throw away third of my memory. I'd rather not

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Message-ID: <20181017140846.GB23838@tassilo.jf.intel.com>
Date:   Wed, 17 Oct 2018 07:08:46 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Pavel Machek <pavel@....cz>
Cc:     vbabka@...e.cz, mhocko@...e.com, hpa@...or.com,
        torvalds@...ux-foundation.org, dave.hansen@...el.com,
        kernel list <linux-kernel@...r.kernel.org>, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de
Subject: Re: l1tf: Kernel suggests I throw away third of my memory. I'd
 rather not

On Wed, Oct 17, 2018 at 12:56:10PM +0200, Pavel Machek wrote:
> Hi!
> 
> 6a012288 suggests I throw away 1GB on RAM. On 3GB system.. that is not
> going to be pleasant.

Just rebuild your kernel with PAE? I assume your CPU supports it.

This will also give you NX, which if you're really worried
about security is far more important than L1TF.

If you don't worry about security just ignore.

-Andi