From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 550A6C43387 for ; Fri, 18 Jan 2019 15:31:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 307D120850 for ; Fri, 18 Jan 2019 15:31:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727688AbfARPb3 (ORCPT ); Fri, 18 Jan 2019 10:31:29 -0500 Received: from www.llwyncelyn.cymru ([82.70.14.225]:59106 "EHLO fuzix.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727448AbfARPb2 (ORCPT ); Fri, 18 Jan 2019 10:31:28 -0500 X-Greylist: delayed 1459 seconds by postgrey-1.27 at vger.kernel.org; Fri, 18 Jan 2019 10:31:28 EST Received: from alans-desktop (82-70-14-226.dsl.in-addr.zen.co.uk [82.70.14.226]) by fuzix.org (8.15.2/8.15.2) with ESMTP id x0IF7708020955; Fri, 18 Jan 2019 15:07:07 GMT Date: Fri, 18 Jan 2019 15:07:06 +0000 From: Alan Cox To: Luke Kenneth Casson Leighton Cc: Linux Kernel Mailing List Subject: Re: [RFC] spectre hardware-software cooperative mitigation Message-ID: <20190118150706.7b1b9e31@alans-desktop> In-Reply-To: References: Organization: Intel Corporation X-Mailer: Claws Mail 3.16.0 (GTK+ 2.24.32; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > This is going to be a mammoth task. The alternatives are to continue > as things are, which is a mess that cannot be cleaned up by either of > (mutually exclusive) hardware or software alone. > > Thoughts and feedback appreciated. You need to be talking to the JIT developers not asking here I think. Speculative attacks in JIT environments is a topic an order of magnitude or more complex than the kernel cases because there isn't even process isolation between the JIT, JIT engin eand support logic. Alan