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=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 250BCC433DF for ; Thu, 28 May 2020 22:48:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E8A9920721 for ; Thu, 28 May 2020 22:48:48 +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="eODnKoUf" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2437308AbgE1Wss (ORCPT ); Thu, 28 May 2020 18:48:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35420 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2437205AbgE1Wsn (ORCPT ); Thu, 28 May 2020 18:48:43 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8F1F8C08C5C6 for ; Thu, 28 May 2020 15:48:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.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; bh=tRXkEJLeN0Bj0Z07YR7RqUj1nPvkZcl0lZrrdyv9YmE=; b=eODnKoUf1A2PUGd6BFsgnLJ7NX URRkvddhJ7qz/+5Njl05HnQB59EjgbOwZrF9dR4c55B05IFpuqNt0bTIbYwBselEvbhyWpANsjn7P Ky97FTpholXkQtogb1FVJeWfZcfeEvBD9ZGa0giv10SqaczDPZqLNjA/tMuP83pChK7TDx06Gktxv pgpEIBJmHjTjY0Fi/ZeZ/Z+7rzRDR9pEgGFHqwVfvjTTwovuh9ucHBplreel9TzmmdmoO7lpBJxti c7uhfyKQFlWaqCz99ea9ecGeuxLRvKwmreMyFcr0tRjkmI6Vx44yJJnqjbJIeo7k0k/ukJlC5bm4G yCzX9TyA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=worktop.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jeRKH-0004fJ-PE; Thu, 28 May 2020 22:48:37 +0000 Received: by worktop.programming.kicks-ass.net (Postfix, from userid 1000) id CAA159834F3; Fri, 29 May 2020 00:48:35 +0200 (CEST) Date: Fri, 29 May 2020 00:48:35 +0200 From: Peter Zijlstra To: Lai Jiangshan Cc: Thomas Gleixner , Andy Lutomirski , LKML , X86 ML , Lai Jiangshan , Sean Christopherson , andrew.cooper3@citrix.com, daniel.thompson@linaro.org Subject: Re: [PATCH 0/6] x86/entry: disallow #DB more Message-ID: <20200528224835.GU2483@worktop.programming.kicks-ass.net> References: <20200528201937.038455891@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, May 29, 2020 at 06:42:46AM +0800, Lai Jiangshan wrote: > On Fri, May 29, 2020 at 4:25 AM Peter Zijlstra wrote: > > > > These patches disallow #DB during NMI/#MC and allow removing a lot of fugly code. > > > > Hello > > Will #DB be allowed in #DF? No, that whole thing is noinstr.