From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754354Ab3EARfh (ORCPT ); Wed, 1 May 2013 13:35:37 -0400 Received: from terminus.zytor.com ([198.137.202.10]:46172 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752748Ab3EARfb (ORCPT ); Wed, 1 May 2013 13:35:31 -0400 Message-ID: <51815252.4010103@zytor.com> Date: Wed, 01 May 2013 10:35:14 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130311 Thunderbird/17.0.4 MIME-Version: 1.0 To: Andy Lutomirski CC: "Theodore Ts'o" , Borislav Petkov , linux-kernel@vger.kernel.org, x86@kernel.org, Andrew Lutomirski Subject: Re: [PATCH v5] x86: Enable fast strings on Intel if BIOS hasn't already References: <3cdeaedaa41e258e8aa9ca83d79a936e0b9462bc.1367385613.git.luto@amacapital.net> <20130501113352.GA29571@pd.tnic> <20130501163404.GA6286@thunk.org> <518145F6.3060800@zytor.com> In-Reply-To: X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/01/2013 09:54 AM, Andy Lutomirski wrote: > > (Just my luck. I'm currently trying to implement WT via PAT by > stealing a slot from either UC or UC-.) > NAK on that. Use a slot in the upper half, perhaps (we already blacklist the CPUs for which the upper half aren't usable.) What do you want WT for, anyway? > Is there any code that memcpys across memory types and expects any > particularly sensible behavior out of it? Unlikely (see my post.) -hpa