From mboxrd@z Thu Jan 1 00:00:00 1970 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752154AbeAEQHp (ORCPT + 1 other); Fri, 5 Jan 2018 11:07:45 -0500 Received: from mail-co1nam03on0082.outbound.protection.outlook.com ([104.47.40.82]:51072 "EHLO NAM03-CO1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751784AbeAEQHn (ORCPT ); Fri, 5 Jan 2018 11:07:43 -0500 Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=Thomas.Lendacky@amd.com; From: Tom Lendacky Subject: [PATCH v1 0/3] x86/cpu/AMD: Make LFENCE a serializing instruction on AMD To: x86@kernel.org, linux-kernel@vger.kernel.org Cc: Peter Zijlstra , Linus Torvalds , Dave Hansen , Borislav Petkov , Thomas Gleixner , Tim Chen , Greg Kroah-Hartman , David Woodhouse , Paul Turner Date: Fri, 05 Jan 2018 10:07:36 -0600 Message-ID: <20180105160736.23786.45026.stgit@tlendack-t1.amdoffice.net> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; 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There is less performance impact using LFENCE in this way compared to MFENCE. With LFENCE now being a serializing instruction, it can be used in rdtsc_ordered() in place of MFENCE_RDTSC. The other two patches in this series make this change and remove the MFENCE_RDTSC feature. The following patches are included in this series: - Make LFENCE a serializing instruction on AMD - Change over to LFENCE_RDTSC from MFENCE_RDTSC on AMD - Remove the MFENCE_RDTSC feature This patch series is based on tip:x86/pti. --- Tom Lendacky (3): x86/cpu/AMD: Make LFENCE a serializing instruction x86/cpu/AMD: Use LFENCE_RDTSC instead of MFENCE_RDTSC x86/msr: Remove now unused definition of MFENCE_RDTSC feature arch/x86/include/asm/cpufeatures.h | 2 +- arch/x86/include/asm/msr-index.h | 2 ++ arch/x86/include/asm/msr.h | 3 +-- arch/x86/kernel/cpu/amd.c | 13 +++++++++++-- 4 files changed, 15 insertions(+), 5 deletions(-) -- Tom Lendacky