From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760248AbZASWOp (ORCPT ); Mon, 19 Jan 2009 17:14:45 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753002AbZASWOg (ORCPT ); Mon, 19 Jan 2009 17:14:36 -0500 Received: from mga02.intel.com ([134.134.136.20]:7417 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752517AbZASWOg (ORCPT ); Mon, 19 Jan 2009 17:14:36 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.37,291,1231142400"; d="scan'208";a="379740241" Date: Mon, 19 Jan 2009 14:14:35 -0800 From: Suresh Siddha To: "H. Peter Anvin" Cc: "Siddha, Suresh B" , Avuton Olrich , LKML , Ingo Molnar Subject: Re: Fail to early boot with v2.6.27-rc2 to at least v2.6.29-rc2 due to dc1e35c Message-ID: <20090119221434.GF31356@linux-os.sc.intel.com> References: <3aa654a40901190604l2149c592ne4fbf782fa46655f@mail.gmail.com> <4974CC8B.1030403@zytor.com> <3aa654a40901191131p7c141378m1bcd3baeed098e09@mail.gmail.com> <4974DD86.2090300@zytor.com> <20090119201115.GD31356@linux-os.sc.intel.com> <3aa654a40901191346i12cc736m40bebd422100a088@mail.gmail.com> <20090119215736.GE31356@linux-os.sc.intel.com> <4974F9A8.7060107@zytor.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4974F9A8.7060107@zytor.com> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jan 19, 2009 at 02:07:36PM -0800, H. Peter Anvin wrote: > Suresh Siddha wrote: > > > > Also, I wonder, if we should complain/scream during boot if we find only > > fewer cpuid levels on modern generation cpu's. > > > > We should, or if this block is reversible, we should probably just undo > it (the reason people put this block in places is because of, ahem, > inferior operating systems having bugs.) > > Do you know how this is managed? Via an MSR? IA32_MISC_ENABLE MSR bit 22