From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751231AbdL2Noq (ORCPT ); Fri, 29 Dec 2017 08:44:46 -0500 Received: from mail.skyhub.de ([5.9.137.197]:47040 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750921AbdL2Nop (ORCPT ); Fri, 29 Dec 2017 08:44:45 -0500 Date: Fri, 29 Dec 2017 14:44:39 +0100 From: Borislav Petkov To: Jia Zhang Cc: Ingo Molnar , tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org, linux-kernel@vger.kernel.org, tony.luck@intel.com Subject: Re: [PATCH v4] x86/microcode/intel: Blacklist the specific BDW-EP for late loading Message-ID: <20171229134439.GA19010@nazgul.tnic> References: <1514292147-101928-1-git-send-email-qianyue.zj@alibaba-inc.com> <20171228122428.4t2lsutuo3y2i75c@gmail.com> <8d92a7af-c583-335d-0f2d-c3faa3c29e64@alibaba-inc.com> <20171229124835.tt5ttpf7i6tkmlnq@gmail.com> <492a0fe6-ca0b-ca97-27bf-e6407c60469c@alibaba-inc.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <492a0fe6-ca0b-ca97-27bf-e6407c60469c@alibaba-inc.com> User-Agent: Mutt/1.6.0 (2016-04-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Dec 29, 2017 at 09:17:34PM +0800, Jia Zhang wrote: > Namely, the end user has to make a BIOS update to uprev the microcode. Not quite: end user is dependent on the OEM to get a BIOS update. What is meant with early loading in this context is, to put the microcode in the initrd so that it gets loaded very early during the *kernel* boot. And early-initrd-based loading is the default method we do microcode loading with, anyway. So the blacklisting is only for *late* loading, through the sysfs trigger. Which is only there for historical reasons and for some configurations. -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. --