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=-3.8 required=3.0 tests=BAYES_00,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 7A74EC433E1 for ; Wed, 29 Jul 2020 20:09:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 42F8B20658 for ; Wed, 29 Jul 2020 20:09:24 +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="NwBWlauT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726756AbgG2UJX (ORCPT ); Wed, 29 Jul 2020 16:09:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55872 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726496AbgG2UJW (ORCPT ); Wed, 29 Jul 2020 16:09:22 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 93D18C061794 for ; Wed, 29 Jul 2020 13:09:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.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=HBPpMEN0+wHZjSVYvpdEqLIdalPNauSoM1Z1gLrPDn4=; b=NwBWlauTMU/PFjXOsLx23P+vJS al6iH5jWWEgxiNz3/5pFqCzKCnrAVfbs/0fjFu3+yo3NBOwSRyNivOypn654XYDQjGKB/TJtt/NaW WgjUKkSoOMdUDGKkM1F9tV14E+9YYR5QDan3r/hqU1aCQ58vKUPhHhIT9R5D2MoqQ2eLyNVwoSwhe llEpsZxMRZ3nkK5URczZk9PaCS5JLgCBW3KF76oQsU86fT0GToiTvK8Ix7LOYEQ9Cl2LfH6MNi1Kg 0zrgZgrjE+oB1p3s7DbnpEuJHyasjCPbn+T7EqKOxyJCyM7pmQzgUBCgYLcQWC7QwkT/Xj0/+H18f ux2LpJ3g==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1k0sNy-0002f4-GV; Wed, 29 Jul 2020 20:09:10 +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 A5E0E300238; Wed, 29 Jul 2020 22:09:06 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 939962B4DBEF0; Wed, 29 Jul 2020 22:09:06 +0200 (CEST) Date: Wed, 29 Jul 2020 22:09:06 +0200 From: peterz@infradead.org To: Sean Christopherson Cc: Fenghua Yu , Thomas Gleixner , Borislav Petkov , Ingo Molnar , "Shanbhogue, Vedvyas" , "Luck, Tony" , H Peter Anvin , Andy Lutomirski , "Shankar, Ravi V" , "Li, Xiaoyao" , x86 , linux-kernel Subject: Re: [PATCH RFC] x86/bus_lock: Enable bus lock detection Message-ID: <20200729200906.GC2655@hirez.programming.kicks-ass.net> References: <1595021700-68460-1-git-send-email-fenghua.yu@intel.com> <20200729030232.GE5583@linux.intel.com> <20200729184614.GI27751@linux.intel.com> <20200729194259.GA318576@otcwcpicx6.sc.intel.com> <20200729200033.GJ27751@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200729200033.GJ27751@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 29, 2020 at 01:00:33PM -0700, Sean Christopherson wrote: > Why do they need to be exclusive? We've already established that BLD catches > things that SLD does not. What's wrong with running sld=fatal and bld=ratelimit > so that split locks never happen and kill applications, and non-WB locks are > are ratelimited? It's all moot until there's a sane proposal for #DB that isn't utterly wrecked.