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=-2.1 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID, USER_AGENT_MUTT 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 685C0C5CFEB for ; Wed, 11 Jul 2018 08:34:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 18476208E3 for ; Wed, 11 Jul 2018 08:34:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="fypWRPdM" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 18476208E3 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732469AbeGKIhz (ORCPT ); Wed, 11 Jul 2018 04:37:55 -0400 Received: from merlin.infradead.org ([205.233.59.134]:56646 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726314AbeGKIhy (ORCPT ); Wed, 11 Jul 2018 04:37:54 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=BQyLoduk6e6xtiiqj8dSagj8Eb1KqCSMrZcSV1hUnOY=; b=fypWRPdM0kq2F6D846H/NOS4Y eEMMGXD1llRCQfGjnEcJC2uKl6Qzu61p4tgGUgm5k9K99v9kwxoWQVQdpdqAWlcIb1AeqCICkICmI fV+ItBqHSeQXUguHViqRB2Jh8n2WxuKrTlqU39pcHF+6+ZAX/yADWEurvRESUUS1rykNNI4V+udvP ujQYBoMQsdbYkIGljPCA2RiL5vDo2Q/aYjrm6CQqYphwiYCA8+aU63/xnsBVW00YoJEQ8Gl+WXCJ1 4OoZ7hXCFK33U7V0zgnQqHSxySYo3BgI8vA2r/bsCchITcx2C6XWOmtUIgAhtvo0XgCpHewWlG6Rz LhtYk831Q==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1fdAZj-0005Iz-7t; Wed, 11 Jul 2018 08:34:15 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 14FCF20291063; Wed, 11 Jul 2018 10:34:12 +0200 (CEST) Date: Wed, 11 Jul 2018 10:34:12 +0200 From: Peter Zijlstra To: Yu-cheng Yu Cc: x86@kernel.org, "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Cyrill Gorcunov , Dave Hansen , Florian Weimer , "H.J. Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , "Ravi V. Shankar" , Vedvyas Shanbhogue Subject: Re: [RFC PATCH v2 08/27] mm: Introduce VM_SHSTK for shadow stack memory Message-ID: <20180711083412.GP2476@hirez.programming.kicks-ass.net> References: <20180710222639.8241-1-yu-cheng.yu@intel.com> <20180710222639.8241-9-yu-cheng.yu@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180710222639.8241-9-yu-cheng.yu@intel.com> User-Agent: Mutt/1.10.0 (2018-05-17) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 10, 2018 at 03:26:20PM -0700, Yu-cheng Yu wrote: > VM_SHSTK indicates a shadow stack memory area. > > A shadow stack PTE must be read-only and dirty. For non shadow > stack, we use a spare bit of the 64-bit PTE for dirty. The PTE > changes are in the next patch. This doesn't make any sense.. the $subject and the patch seem completely unrelated to this Changelog.