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 ; 15 Oct 2019 21:14:14 -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 1iKU8y-00009m-OB for speck@linutronix.de; Tue, 15 Oct 2019 23:14:14 +0200 Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 94A57ACB9 for ; Tue, 15 Oct 2019 21:14:05 +0000 (UTC) Date: Tue, 15 Oct 2019 23:14:03 +0200 (CEST) From: Jiri Kosina Subject: [MODERATED] Re: [PATCH v5 08/11] TAAv5 8 In-Reply-To: <20191015205631.GF30412@guptapadev.amr> Message-ID: References: <20191015103454.GW317@dhcp22.suse.cz> <20191015130627.7jkhqy2zrtm35ool@treble> <20191015152649.yim4krwuttrh6xgi@treble> <20191015200024.hxs4brxi7gbvmcdy@treble> <20191015205631.GF30412@guptapadev.amr> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit To: speck@linutronix.de List-ID: On Tue, 15 Oct 2019, speck for Pawan Gupta wrote: > tsx_ctrl_is_supported() checks for the TSX_CTRL MSR support and then > only attempts at disabling TSX. MDS_NO=0 CPUs will not get the ucode > update for TSX control, therefore tsx=auto wont cause regression on > older CPUs. OK, that piece of information finally made it to make sense again :) So I believe distros still want the option (Michal's patch) to default to 'auto', so that actual heavy users of TSX will get the right thing once they update their CPUs to !TAA_BUG ones, but it's less urgent that I originally thought. Thanks, -- Jiri Kosina SUSE Labs