From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755474AbaIRNHs (ORCPT ); Thu, 18 Sep 2014 09:07:48 -0400 Received: from mx1.redhat.com ([209.132.183.28]:12943 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755013AbaIRNHr (ORCPT ); Thu, 18 Sep 2014 09:07:47 -0400 Message-ID: <541AD8F3.5010700@redhat.com> Date: Thu, 18 Sep 2014 15:06:59 +0200 From: Paolo Bonzini User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.0 MIME-Version: 1.0 To: Borislav Petkov , Nadav Amit CC: Ingo Molnar , "H. Peter Anvin" , Ingo Molnar , Thomas Gleixner , the arch/x86 maintainers , kvm , Linux Kernel Mailing List , Linus Torvalds , Andrew Morton , Peter Zijlstra Subject: Re: [RESEND PATCH 1/3] x86: Adding structs to reflect cpuid fields References: <20140917124501.GC5358@nazgul.tnic> <1410958454-7501-1-git-send-email-namit@cs.technion.ac.il> <1410958454-7501-2-git-send-email-namit@cs.technion.ac.il> <20140917132141.GD5358@nazgul.tnic> <20140917140601.GE5358@nazgul.tnic> In-Reply-To: <20140917140601.GE5358@nazgul.tnic> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Il 17/09/2014 16:06, Borislav Petkov ha scritto: >> > AFAIK backward compatibility is usually maintained in x86. I did not >> > see in Intel SDM anything that says "this CPUID field means something >> > for CPU X and something else for CPU Y". Anyhow, it is not different >> > than bitmasks in this respect. > You still don't get my point: what are you going to do when > min_monitor_line_size needs to be 17 bits all of a sudden? The extra bit used to be reserved and thus will be zero on older families. So, nothing? Paolo