From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932431AbWEFEQ4 (ORCPT ); Sat, 6 May 2006 00:16:56 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932432AbWEFEQ4 (ORCPT ); Sat, 6 May 2006 00:16:56 -0400 Received: from 2-1-3-15a.ens.sth.bostream.se ([82.182.31.214]:29870 "EHLO zoo.weinigel.se") by vger.kernel.org with ESMTP id S932431AbWEFEQz (ORCPT ); Sat, 6 May 2006 00:16:55 -0400 To: Andi Kleen Cc: "H. Peter Anvin" , linux-kernel@vger.kernel.org Subject: Re: Bugs aren't features: X86_FEATURE_FXSAVE_LEAK References: <445B7EF0.6090708@zytor.com> From: Christer Weinigel Organization: Weinigel Ingenjorsbyra AB Date: 06 May 2006 06:16:54 +0200 In-Reply-To: Message-ID: User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.4 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Andi Kleen writes: > "H. Peter Anvin" writes: > > > The recent fix for the AMD FXSAVE information leak had a problematic > > side effect. It introduced an entry in the x86 features vector which > > is a bug, not a feature. > > It's a non issue because it affects all AMD CPUs (except K5/K6). > You'll never find a system where only some CPUs have this problem. I have a dual CPU system (Tyan Tomcat 1564D) where only one CPU is reported to have the F00F bug (iirc). So yes, there can be SMP-systems where the CPU's have different bugs. /Christer -- "Just how much can I get away with and still go to heaven?" Freelance consultant specializing in device driver programming for Linux Christer Weinigel http://www.weinigel.se