From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp.codeaurora.org by pdx-caf-mail.web.codeaurora.org (Dovecot) with LMTP id YyofM/llGVufCwAAmS7hNA ; Thu, 07 Jun 2018 17:07:21 +0000 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id ED2F5606DD; Thu, 7 Jun 2018 17:07:20 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on pdx-caf-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI autolearn=ham autolearn_force=no version=3.4.0 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by smtp.codeaurora.org (Postfix) with ESMTP id 68E9660115; Thu, 7 Jun 2018 17:07:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 68E9660115 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934733AbeFGRG1 (ORCPT + 25 others); Thu, 7 Jun 2018 13:06:27 -0400 Received: from mga12.intel.com ([192.55.52.136]:32205 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934563AbeFGRGY (ORCPT ); Thu, 7 Jun 2018 13:06:24 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 07 Jun 2018 10:06:23 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,487,1520924400"; d="scan'208";a="206183220" Received: from chang-linux-2.sc.intel.com ([10.3.52.139]) by orsmga004.jf.intel.com with ESMTP; 07 Jun 2018 10:06:23 -0700 From: "Chang S. Bae" To: Andy Lutomirski , "H . Peter Anvin" , Thomas Gleixner , Ingo Molnar Cc: Andi Kleen , Dave Hansen , Markus T Metzger , "Ravi V . Shankar" , "Chang S . Bae" , LKML Subject: [PATCH v3 4/7] x86/fsgsbase/64: Factor out load FS/GS segments from __switch_to Date: Thu, 7 Jun 2018 10:06:05 -0700 Message-Id: <1528391168-22224-5-git-send-email-chang.seok.bae@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1528391168-22224-1-git-send-email-chang.seok.bae@intel.com> References: <1528391168-22224-1-git-send-email-chang.seok.bae@intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Instead of open code, load_fsgs() will cleanup __switch_to and symmetric with FS/GS segment save. When FSGSBASE enabled, X86_FEATURE_FSGSBASE check will be incorporated. Signed-off-by: Chang S. Bae Reviewed-by: Andi Kleen Cc: H. Peter Anvin Cc: Dave Hansen Cc: Thomas Gleixner Cc: Ingo Molnar Reviewed-by: Andy Lutomirski --- arch/x86/kernel/process_64.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index e498671..cebf240 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -279,6 +279,15 @@ static __always_inline void load_seg_legacy(unsigned short prev_index, } } +static __always_inline void load_fsgs(struct thread_struct *prev, + struct thread_struct *next) +{ + load_seg_legacy(prev->fsindex, prev->fsbase, + next->fsindex, next->fsbase, FS); + load_seg_legacy(prev->gsindex, prev->gsbase, + next->gsindex, next->gsbase, GS); +} + static unsigned long task_seg_base(struct task_struct *task, unsigned short selector) { @@ -588,10 +597,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) if (unlikely(next->ds | prev->ds)) loadsegment(ds, next->ds); - load_seg_legacy(prev->fsindex, prev->fsbase, - next->fsindex, next->fsbase, FS); - load_seg_legacy(prev->gsindex, prev->gsbase, - next->gsindex, next->gsbase, GS); + load_fsgs(prev, next); switch_fpu_finish(next_fpu, cpu); -- 2.7.4