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 EACF2C43143 for ; Thu, 21 Jun 2018 22:07:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9BCEE2247F for ; Thu, 21 Jun 2018 22:07:30 +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="gnANT/Dn" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9BCEE2247F 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 S933871AbeFUWH2 (ORCPT ); Thu, 21 Jun 2018 18:07:28 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:58764 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933622AbeFUWH1 (ORCPT ); Thu, 21 Jun 2018 18:07:27 -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: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=eb8oqYm9s9FpXa+k2wUJbOlD0ATgdiZu7+7Efq4uLrc=; b=gnANT/Dnhp4PtXwh0RWJNumP2 poMTaW3nosE2KeDWW71J/h/JEdNchOJM8+5n5iDtRHrNcLBEnDg7v6x/GP3DLSpB0bodGkfTFXt46 iV3YHtXrUaiD1trkVo6XTxcl98Ez1S2TlC/Of7ycl9VWExdExqTyYHFdlsQ/44c4DD4oodkmMPuyH 4mZ2F3KXxQyuWNPR0M2bhQATfX9OiS+q2AXebm5EL5TdjZ1BJ1y/af4Reo1bYkPLGR5fCGpDUrMtA GDuN3lSwZE8iJ6XQ5CgeY5TCNWMj1PVw29N7DlCdV6161OFOTVijpa6uOpJNEY2l3l5UICvHaV32c wGod9XijA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1fW7jf-0008TE-Dg; Thu, 21 Jun 2018 22:07:23 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 3661D2029F1D7; Fri, 22 Jun 2018 00:07:21 +0200 (CEST) Date: Fri, 22 Jun 2018 00:07:21 +0200 From: Peter Zijlstra To: Fenghua Yu Cc: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Ashok Raj , Dave Hansen , Rafael Wysocki , Tony Luck , Alan Cox , Ravi V Shankar , Arjan van de Ven , linux-kernel , x86 Subject: Re: [RFC PATCH 00/16] x86/split_lock: Enable #AC exception for split locked accesses Message-ID: <20180621220721.GA2494@hirez.programming.kicks-ass.net> References: <1527435965-202085-1-git-send-email-fenghua.yu@intel.com> <20180621193738.GA13636@worktop.programming.kicks-ass.net> <20180621201851.GC114883@romley-ivt3.sc.intel.com> <20180621220003.GD114883@romley-ivt3.sc.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180621220003.GD114883@romley-ivt3.sc.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 Thu, Jun 21, 2018 at 03:00:03PM -0700, Fenghua Yu wrote: > And perf cannot count split lock events in firmware. In real time, even > split lock in firmware (reboot, run time services, etc) may not be tolerant > and need to be detected and prevented. And yet you want to allow firmware to use them by excluding it in these here patches. Make up your mind.