From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 23F60ECDE30 for ; Wed, 17 Oct 2018 14:08:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EAAEB214C2 for ; Wed, 17 Oct 2018 14:08:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EAAEB214C2 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727532AbeJQWEj (ORCPT ); Wed, 17 Oct 2018 18:04:39 -0400 Received: from mga09.intel.com ([134.134.136.24]:57392 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727050AbeJQWEi (ORCPT ); Wed, 17 Oct 2018 18:04:38 -0400 X-Amp-Result: UNSCANNABLE X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Oct 2018 07:08:46 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,392,1534834800"; d="scan'208";a="100009558" Received: from tassilo.jf.intel.com (HELO tassilo.localdomain) ([10.7.201.126]) by fmsmga001.fm.intel.com with ESMTP; 17 Oct 2018 07:08:46 -0700 Received: by tassilo.localdomain (Postfix, from userid 1000) id 0E7F3300FA1; Wed, 17 Oct 2018 07:08:46 -0700 (PDT) Date: Wed, 17 Oct 2018 07:08:46 -0700 From: Andi Kleen To: Pavel Machek Cc: vbabka@suse.cz, mhocko@suse.com, hpa@zytor.com, torvalds@linux-foundation.org, dave.hansen@intel.com, kernel list , tglx@linutronix.de, mingo@redhat.com, bp@alien8.de Subject: Re: l1tf: Kernel suggests I throw away third of my memory. I'd rather not Message-ID: <20181017140846.GB23838@tassilo.jf.intel.com> References: <20181017105610.GA4260@amd> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181017105610.GA4260@amd> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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