Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753330AbbKIKMQ (ORCPT ); Mon, 9 Nov 2015 05:12:16 -0500 Received: from mail.skyhub.de ([78.46.96.112]:46972 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753151AbbKIKML (ORCPT ); Mon, 9 Nov 2015 05:12:11 -0500 Date: Mon, 9 Nov 2015 11:11:59 +0100 From: Borislav Petkov To: Harald Hoyer Cc: Josh Boyer , Laura Abbott , X86 ML , LKML Subject: Re: [PATCH 2/6] x86/microcode: Merge early loader Message-ID: <20151109101159.GA14962@pd.tnic> References: <1445334889-300-1-git-send-email-bp@alien8.de> <1445334889-300-3-git-send-email-bp@alien8.de> <20151106193122.GE19522@pd.tnic> <56406A75.3030006@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <56406A75.3030006@redhat.com> 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 Content-Length: 1329 Lines: 38 On Mon, Nov 09, 2015 at 10:42:13AM +0100, Harald Hoyer wrote: > Will this work with kernels not supporting the microcode loading? > Theoretically the old kernels would just unpack all cpios one after > the other, right? Well, what we should be doing is adding two paths to the initrd: for AMD: kernel/x86/microcode/AuthenticAMD.bin for Intel: kernel/x86/microcode/GenuineIntel.bin I.e., the microcode blobs become part of the initrd, see Documentation/x86/early-microcode.txt. The loader goes and opens the one it needs at boot time. You could also add a switch for convenience, something like --no-microcode or so, so that dracut doesn't add it but if one wants to not add microcode, one could also move it away from, say, /lib/firmware/ so that dracut simply doesn't find it. The --no-microcode might be more convenient though. Kernels which don't support microcode loading would simply not look for that path. Let me know if this doesn't make sense and if I need to test/look at patches. Thanks. -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/