From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933972AbdKBSYk (ORCPT ); Thu, 2 Nov 2017 14:24:40 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:55852 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933742AbdKBSYg (ORCPT ); Thu, 2 Nov 2017 14:24:36 -0400 Date: Thu, 2 Nov 2017 19:24:32 +0100 (CET) From: Thomas Gleixner To: Andy Lutomirski cc: Dave Hansen , Andy Lutomirski , Linus Torvalds , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , moritz.lipp@iaik.tugraz.at, Daniel Gruss , michael.schwarz@iaik.tugraz.at, Kees Cook , Hugh Dickins , X86 ML Subject: Re: [PATCH 02/23] x86, kaiser: do not set _PAGE_USER for init_mm page tables In-Reply-To: Message-ID: References: <20171031223146.6B47C861@viggo.jf.intel.com> <20171031223150.AB41C68F@viggo.jf.intel.com> User-Agent: Alpine 2.20 (DEB 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2 Nov 2017, Andy Lutomirski wrote: > > On Nov 2, 2017, at 5:38 PM, Dave Hansen wrote: > > > >> On 11/02/2017 04:33 AM, Thomas Gleixner wrote: > >> So for the problem at hand, I'd suggest we disable the vsyscall stuff if > >> CONFIG_KAISER=y and be done with it. > > > > Just to be clear, are we suggesting to just disable > > LEGACY_VSYSCALL_NATIVE if KAISER=y, and allow LEGACY_VSYSCALL_EMULATE? > > Or, do we just force LEGACY_VSYSCALL_NONE=y? > > We'd have to force NONE, and Linus won't like it. The much I hate it, I already accepted grudgingly that we have to keep it alive in some way or the other. Thanks, tglx