From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751430AbeFDTY4 (ORCPT ); Mon, 4 Jun 2018 15:24:56 -0400 Received: from mga05.intel.com ([192.55.52.43]:40503 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751135AbeFDTYq (ORCPT ); Mon, 4 Jun 2018 15:24:46 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,476,1520924400"; d="scan'208";a="64240681" 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 3/6] x86/fsgsbase/64: Use FS/GS base helpers in core dump Date: Mon, 4 Jun 2018 12:24:26 -0700 Message-Id: <1528140269-26205-4-git-send-email-chang.seok.bae@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1528140269-26205-1-git-send-email-chang.seok.bae@intel.com> References: <1528140269-26205-1-git-send-email-chang.seok.bae@intel.com> Sender: linux-kernel-owner@vger.kernel.org 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