From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751648AbaECLYd (ORCPT ); Sat, 3 May 2014 07:24:33 -0400 Received: from cdptpa-outbound-snat.email.rr.com ([107.14.166.225]:10221 "EHLO cdptpa-oedge-vip.email.rr.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751121AbaECLYc (ORCPT ); Sat, 3 May 2014 07:24:32 -0400 Date: Sat, 3 May 2014 07:24:28 -0400 From: Steven Rostedt To: "H. Peter Anvin" Cc: Andy Lutomirski , Linus Torvalds , Thomas Gleixner , Linux Kernel Mailing List , x86@kernel.org, Gleb Natapov , Paolo Bonzini Subject: Re: [PATCH v2] x86: Return to kernel without IRET Message-ID: <20140503072428.54f89688@gandalf.local.home> In-Reply-To: <53646A7E.8010400@zytor.com> References: <6cfe29821979c42cd812878e05577f69f99fafaf.1399074748.git.luto@amacapital.net> <53646A7E.8010400@zytor.com> X-Mailer: Claws Mail 3.9.3 (GTK+ 2.24.22; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-RR-Connecting-IP: 107.14.168.118:25 X-Cloudmark-Score: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 02 May 2014 21:03:10 -0700 "H. Peter Anvin" wrote: > > I'd really like to see a workload which would genuinely benefit before > adding more complexity. Now... if we can determine that it doesn't harm > anything and would solve the NMI nesting problem cleaner than the > current solution, that would justify things, too... > As I stated before. It doesn't solve the NMI nesting problem. It only handles page faults. We would have to implement this for breakpoint return paths too. Is that a plan as well? -- Steve