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=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 4F635C43331 for ; Thu, 2 Apr 2020 18:52:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 23043206E9 for ; Thu, 2 Apr 2020 18:52:03 +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="Y44LYPWR" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389160AbgDBSwC (ORCPT ); Thu, 2 Apr 2020 14:52:02 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:54048 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732214AbgDBSwB (ORCPT ); Thu, 2 Apr 2020 14:52:01 -0400 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=qd5xuLJzU3mBucxLenFQ+oj6WqOdCWeIJKMVqEffaug=; b=Y44LYPWRj75Go9ZxA68YxS4Gtw DBiWZDq0vpo/K4QQ0jt5Cv1oJJzXXMjeV6OF6dFoCvpS9kqMleo8IoVOCWR+ACk6L1T+iCa2AVH/3 u0Kiuji5tF1syj0LkhhGqJQ5ATiJNU5fk6ydylozSVTyjTWeZzIKmtu4Cr7Pl19A3oPkX7jeFgfzE nNwVtsvUx67GITe+EVx+axOqM1FfrHnzcMTFtu8509UAKQNL29Lhvg868KAQ6T0FWi5bA3IBhbZ7S zbik+HgiQpJiKJ+w57A5CUcVBnZ8fDQCSjASAVIFBr7ZsUREMoHjTcJyjTdT1BbYqITJAE2tIRxkJ HVv4aEIA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jK4wQ-0003xo-FQ; Thu, 02 Apr 2020 18:51:50 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id A175A305E45; Thu, 2 Apr 2020 20:51:48 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 5A3D82B12094D; Thu, 2 Apr 2020 20:51:48 +0200 (CEST) Date: Thu, 2 Apr 2020 20:51:48 +0200 From: Peter Zijlstra To: Sean Christopherson Cc: Thomas Gleixner , Xiaoyao Li , LKML , x86@kernel.org, "Kenneth R. Crudup" , Paolo Bonzini , Jessica Yu , Fenghua Yu , Nadav Amit , Thomas Hellstrom , Tony Luck , Steven Rostedt Subject: Re: [patch v2 1/2] x86,module: Detect VMX modules and disable Split-Lock-Detect Message-ID: <20200402185148.GL20730@hirez.programming.kicks-ass.net> References: <20200402123258.895628824@linutronix.de> <20200402124205.242674296@linutronix.de> <20200402152340.GL20713@hirez.programming.kicks-ass.net> <725ca48f-8194-658e-0296-65d4368803b5@intel.com> <20200402162548.GH20730@hirez.programming.kicks-ass.net> <2d2140c4-712a-2f8d-cde7-b3e64c28b204@intel.com> <87pncpn650.fsf@nanos.tec.linutronix.de> <20200402175127.GJ13879@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200402175127.GJ13879@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Apr 02, 2020 at 10:51:28AM -0700, Sean Christopherson wrote: > On Thu, Apr 02, 2020 at 07:34:35PM +0200, Thomas Gleixner wrote: > > Aside of that I'm still against the attempt of proliferating crap, > > i.e. disabling it because the host is triggering it and then exposing it > > to guests. The above does not change my mind in any way. This proposal > > is still wrong. > > Eh, I still think the "off in host, on in guest" is a legit scenario for > debug/development/testing, but I agree that the added complexity doesn't > justify the minimal benefits versus sld_warn. Off in host on in guest seems utterly insane to me. Why do you care about that? That's like building a bridge with rotten timber.