From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752049AbaIYMKQ (ORCPT ); Thu, 25 Sep 2014 08:10:16 -0400 Received: from mail.skyhub.de ([78.46.96.112]:37509 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751284AbaIYMKO (ORCPT ); Thu, 25 Sep 2014 08:10:14 -0400 Date: Thu, 25 Sep 2014 14:10:07 +0200 From: Borislav Petkov To: Henrique de Moraes Holschuh Cc: Chuck Ebbert , Andy Lutomirski , "H. Peter Anvin" , "linux-kernel@vger.kernel.org" Subject: Re: x86, microcode: BUG: microcode update that changes x86_capability Message-ID: <20140925121007.GA25334@nazgul.tnic> References: <20140919110014.GC29639@khazad-dum.debian.net> <20140919112953.GA3256@nazgul.tnic> <20140919075415.5149d5f2@as> <20140919150042.GC5318@nazgul.tnic> <20140919164217.GD17456@khazad-dum.debian.net> <20140923200054.GB16467@pd.tnic> <20140924145658.GB31678@khazad-dum.debian.net> <20140925085158.GF22317@nazgul.tnic> <20140925113643.GB10569@khazad-dum.debian.net> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20140925113643.GB10569@khazad-dum.debian.net> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Sep 25, 2014 at 08:36:45AM -0300, Henrique de Moraes Holschuh wrote: > This isn't an useless fix, it will allow systems without early initramfs > support to operate correctly after a microcode update. So what do we do if we update the microcode late and some userspace task is using HLE and all of a sudden it segfaults and gets killed due to #UD. I'll forward all those complaint emails to you then, no? :-) What's saying is, a reboot in this case is maybe the lesser of two evils. -- Regards/Gruss, Boris. --