From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linutronix.de (193.142.43.55:993) by crypto-ml.lab.linutronix.de with IMAP4-SSL for ; 16 Oct 2019 09:23:44 -0000 Received: from mx2.suse.de ([195.135.220.15] helo=mx1.suse.de) by Galois.linutronix.de with esmtps (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1iKfWv-0001NR-RC for speck@linutronix.de; Wed, 16 Oct 2019 11:23:43 +0200 Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 3CA80B21D for ; Wed, 16 Oct 2019 09:23:34 +0000 (UTC) Date: Wed, 16 Oct 2019 11:23:33 +0200 From: Michal Hocko Subject: [MODERATED] Re: ***UNCHECKED*** Re: Re: Re: [PATCH v5 08/11] TAAv5 8 Message-ID: <20191016092333.GQ317@dhcp22.suse.cz> References: <20191009131251.GD6616@dhcp22.suse.cz> <20191014210458.GF4957@zn.tnic> <20191015103454.GW317@dhcp22.suse.cz> <20191016075434.GL317@dhcp22.suse.cz> MIME-Version: 1.0 In-Reply-To: <20191016075434.GL317@dhcp22.suse.cz> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit To: speck@linutronix.de List-ID: On Wed 16-10-19 09:54:34, speck for Michal Hocko wrote: [...] > +config X86_INTEL_TSX_MODE_OFF > + bool "off" > + help > + TSX is always disabled - equals tsx=off command line parameter. > + > +config X86_INTEL_TSX_MODE_ON > + bool "on" > + help > + TSX is always enabled on TSX capable HW - equals tsx=on command line > + parameter. > + > +config X86_INTEL_TSX_MODE_AUTO > + bool "auto" > + help > + TSX is enabled on TSX capable HW that is believed to be safe against > + side channel attacks- equals tsx=auto command line parameter. > +endchoice I have just reread the discussion again and I have to say that there is more confusion and uncertainty than I would like to see. Can somebody from Intel give an authoritative answer to the following question please? Is tsx=auto going to lead to any different state than tsx=on? In other words does auto mode make any sense at all? Thanks! -- Michal Hocko SUSE Labs