From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753480AbdK0TSE (ORCPT ); Mon, 27 Nov 2017 14:18:04 -0500 Received: from mga02.intel.com ([134.134.136.20]:7262 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752597AbdK0TSC (ORCPT ); Mon, 27 Nov 2017 14:18:02 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.44,465,1505804400"; d="scan'208";a="10221355" Subject: Re: [PATCH 04/24] x86/mm/kaiser: Unmap kernel mappings from userspace page tables, core patch To: Peter Zijlstra , Ingo Molnar References: <20171127104923.14378-1-mingo@kernel.org> <20171127104923.14378-5-mingo@kernel.org> <20171127153907.b2nx4a5v3zgxqmyh@hirez.programming.kicks-ass.net> Cc: linux-kernel@vger.kernel.org, Andy Lutomirski , Thomas Gleixner , "H . Peter Anvin" , Borislav Petkov , Linus Torvalds From: Dave Hansen Message-ID: <405c33ba-6177-b068-0150-7f474be215c3@linux.intel.com> Date: Mon, 27 Nov 2017 11:17:58 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 MIME-Version: 1.0 In-Reply-To: <20171127153907.b2nx4a5v3zgxqmyh@hirez.programming.kicks-ass.net> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/27/2017 07:39 AM, Peter Zijlstra wrote: > So I had the problem that I could not tell if my shiny new kernel had > this brand spanking awesome feature enabled or not. > > Do we want something like so? I eventually shoved one of these in the (buggy) runtime enable/disable patch. But, yeah, we do.