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 3D928C43142 for ; Tue, 26 Jun 2018 11:31:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D4826269D1 for ; Tue, 26 Jun 2018 11:31:16 +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="gr8awIT7" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D4826269D1 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 S934572AbeFZLbP (ORCPT ); Tue, 26 Jun 2018 07:31:15 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:46308 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933576AbeFZLbO (ORCPT ); Tue, 26 Jun 2018 07:31:14 -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=g3CYTxThdejzIUPC/s3asGC0UiYzpA2rj+ae9F3ytt0=; b=gr8awIT7jRTV7+y7j8A33twen cA2/IcV+NJcRffUx3+YriWcsgChaK2hQG4VC75PKonkZyhZJiUCghaTe+65UR5YpK0KcH9HIPNBXn o6SZfpAEh31reoKj/eE5nIYoqNW2PhpsXHJEO7+32cnAOZNN6iSkkHzTthOqfK3zOAd6yoj5mP9pO K91pv7gfCGklcQP4ri1gXlfQ/ex1xmbODWkUzCuwS4zhM36RBT4xjOZxSDPWD4G43prrDepYt7TVB NWNtLsO7vt0U7qvL60BnkYZpzezOxBbJN5oqtsMlR3YGKbM5HPW+F4k3N6SHPak/wfyGwRePZnEmc 1cVlqEK9A==; 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 1fXmBd-00080z-P1; Tue, 26 Jun 2018 11:31:06 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 6A4752029F1D9; Tue, 26 Jun 2018 13:31:03 +0200 (CEST) Date: Tue, 26 Jun 2018 13:31:03 +0200 From: Peter Zijlstra To: Alan Cox Cc: Alan Cox , Fenghua Yu , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Ashok Raj , Dave Hansen , Rafael Wysocki , Tony Luck , Ravi V Shankar , Arjan van de Ven , linux-kernel , x86 Subject: Re: [RFC PATCH 06/16] x86/split_lock: Save #AC setting for split lock in firmware in boot time and restore the setting in reboot Message-ID: <20180626113103.GB2458@hirez.programming.kicks-ass.net> References: <1527435965-202085-1-git-send-email-fenghua.yu@intel.com> <1527435965-202085-7-git-send-email-fenghua.yu@intel.com> <20180621195823.GD13636@worktop.programming.kicks-ass.net> <1529680267.4364.50.camel@linux.intel.com> <20180626090521.GF2494@hirez.programming.kicks-ass.net> <20180626120221.7fbd0eff@alans-desktop> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180626120221.7fbd0eff@alans-desktop> 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, Jun 26, 2018 at 12:02:21PM +0100, Alan Cox wrote: > > But then how do we deal with SMIs ? > > On a system doing that level of real time you don't do SMIs. And where do I buy one of those systems? SMIs are a real problem today, we need help to make them go away.