From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758252Ab3K0WcH (ORCPT ); Wed, 27 Nov 2013 17:32:07 -0500 Received: from terminus.zytor.com ([198.137.202.10]:53366 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753959Ab3K0WcF (ORCPT ); Wed, 27 Nov 2013 17:32:05 -0500 User-Agent: K-9 Mail for Android In-Reply-To: <20131127222944.GB748@pd.tnic> References: <1385426236-14960-1-git-send-email-andi@firstfloor.org> <5294F10C.8060901@amacapital.net> <52964EC7.9000504@zytor.com> <52966C0A.7070201@zytor.com> <20131127222104.GA748@pd.tnic> <20131127222944.GB748@pd.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: Re: [PATCH] Add a text_poke syscall v2 From: "H. Peter Anvin" Date: Wed, 27 Nov 2013 14:31:11 -0800 To: Borislav Petkov CC: Linus Torvalds , Andy Lutomirski , Andi Kleen , Linux Kernel Mailing List , Ingo Molnar , Andi Kleen , Thomas Gleixner Message-ID: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org No, we're not... sysexit/sysret doesn't count. Borislav Petkov wrote: >On Wed, Nov 27, 2013 at 02:25:29PM -0800, H. Peter Anvin wrote: >> Actually the CPUID is superfluous on anything than the executing CPU >> since IRET is serializing. > >Why not on the executing core too? We're IRET-ting there too. > >Which would mean that a dummy empty syscall would be enough too since >we >need the serialization only. -- Sent from my mobile phone. Please pardon brevity and lack of formatting.