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 mIB3Cj5mGVuMDQAAmS7hNA ; Thu, 07 Jun 2018 17:07:10 +0000 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 1A46A608B8; Thu, 7 Jun 2018 17:07:10 +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 7F3ED60290; Thu, 7 Jun 2018 17:07:09 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 7F3ED60290 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 S934802AbeFGRG3 (ORCPT + 25 others); Thu, 7 Jun 2018 13:06:29 -0400 Received: from mga12.intel.com ([192.55.52.136]:32208 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934468AbeFGRGY (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="206183217" Received: from chang-linux-2.sc.intel.com ([10.3.52.139]) by orsmga004.jf.intel.com with ESMTP; 07 Jun 2018 10:06:22 -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 3/7] x86/fsgsbase/64: Use FS/GS base helpers in core dump Date: Thu, 7 Jun 2018 10:06:04 -0700 Message-Id: <1528391168-22224-4-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 When new FSGSBASE instructions enabled, this read will become faster. Based-on-code-from: Andy Lutomirski 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/include/asm/elf.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h index 0d157d2..49acefb 100644 --- a/arch/x86/include/asm/elf.h +++ b/arch/x86/include/asm/elf.h @@ -10,6 +10,7 @@ #include #include #include +#include typedef unsigned long elf_greg_t; @@ -205,7 +206,6 @@ void set_personality_ia32(bool); #define ELF_CORE_COPY_REGS(pr_reg, regs) \ do { \ - unsigned long base; \ unsigned v; \ (pr_reg)[0] = (regs)->r15; \ (pr_reg)[1] = (regs)->r14; \ @@ -228,8 +228,8 @@ do { \ (pr_reg)[18] = (regs)->flags; \ (pr_reg)[19] = (regs)->sp; \ (pr_reg)[20] = (regs)->ss; \ - rdmsrl(MSR_FS_BASE, base); (pr_reg)[21] = base; \ - rdmsrl(MSR_KERNEL_GS_BASE, base); (pr_reg)[22] = base; \ + (pr_reg)[21] = read_fsbase(); \ + (pr_reg)[22] = read_inactive_gsbase(); \ asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v; \ asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v; \ asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v; \ -- 2.7.4