From mboxrd@z Thu Jan 1 00:00:00 1970 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752221AbeAEQgw (ORCPT + 1 other); Fri, 5 Jan 2018 11:36:52 -0500 Received: from mail-sn1nam02on0080.outbound.protection.outlook.com ([104.47.36.80]:30272 "EHLO NAM02-SN1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751617AbeAEQgu (ORCPT ); Fri, 5 Jan 2018 11:36:50 -0500 Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=Thomas.Lendacky@amd.com; Subject: Re: [PATCH v1 1/3] x86/cpu/AMD: Make LFENCE a serializing instruction To: Brian Gerst Cc: the arch/x86 maintainers , Linux Kernel Mailing List , Peter Zijlstra , Linus Torvalds , Dave Hansen , Borislav Petkov , Thomas Gleixner , Tim Chen , Greg Kroah-Hartman , David Woodhouse , Paul Turner References: <20180105160736.23786.45026.stgit@tlendack-t1.amdoffice.net> <20180105160746.23786.11850.stgit@tlendack-t1.amdoffice.net> From: Tom Lendacky Message-ID: <29225f25-033b-92d5-2e19-29eb557665d6@amd.com> Date: Fri, 5 Jan 2018 10:36:40 -0600 User-Agent: Mozilla/5.0 (Windows NT 10.0; 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Some families >> that support LFENCE do not have this MSR. For these families, the LFENCE >> instruction is already serializing. > > Does this require a microcode update? No, it doesn't. Thanks, Tom > > -- > Brian Gerst >