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=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,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 07660C43381 for ; Tue, 5 Mar 2019 00:13:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CEF1A20663 for ; Tue, 5 Mar 2019 00:13:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726805AbfCEANs (ORCPT ); Mon, 4 Mar 2019 19:13:48 -0500 Received: from mga05.intel.com ([192.55.52.43]:20023 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726080AbfCEANs (ORCPT ); Mon, 4 Mar 2019 19:13:48 -0500 X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 04 Mar 2019 16:13:48 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.58,441,1544515200"; d="scan'208";a="325410165" Received: from romley-ivt3.sc.intel.com ([172.25.110.60]) by fmsmga005.fm.intel.com with ESMTP; 04 Mar 2019 16:13:47 -0800 Date: Mon, 4 Mar 2019 16:06:54 -0800 From: Fenghua Yu To: Konrad Rzeszutek Wilk Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , H Peter Anvin , Paolo Bonzini , Dave Hansen , Ashok Raj , Peter Zijlstra , Ravi V Shankar , Xiaoyao Li , linux-kernel , x86 , kvm@vger.kernel.org Subject: Re: [PATCH v4 00/17] x86/split_lock: Enable #AC exception for split locked accesses Message-ID: <20190305000653.GA233112@romley-ivt3.sc.intel.com> References: <1551494711-213533-1-git-send-email-fenghua.yu@intel.com> <20190304215505.GC30350@char.us.oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190304215505.GC30350@char.us.oracle.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Mar 04, 2019 at 04:55:05PM -0500, Konrad Rzeszutek Wilk wrote: > > This capability may also find usage in cloud. A user process with split > > lock running in one guest can block other cores from accessing shared > > memory during its split locked memory access. That may cause overall > > system performance degradation. > > "shared memory" ? As in memory shared between two guests? Maybe I should remove the "shared" here. Thanks. -Fenghua