From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A60FCC43613 for ; Sat, 22 Jun 2019 10:07:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6D840206B7 for ; Sat, 22 Jun 2019 10:07:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=zytor.com header.i=@zytor.com header.b="x0bB0RcO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726373AbfFVKHK (ORCPT ); Sat, 22 Jun 2019 06:07:10 -0400 Received: from terminus.zytor.com ([198.137.202.136]:37093 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726112AbfFVKHJ (ORCPT ); Sat, 22 Jun 2019 06:07:09 -0400 Received: from terminus.zytor.com (localhost [127.0.0.1]) by terminus.zytor.com (8.15.2/8.15.2) with ESMTPS id x5MA6tQI2096033 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Sat, 22 Jun 2019 03:06:55 -0700 DKIM-Filter: OpenDKIM Filter v2.11.0 terminus.zytor.com x5MA6tQI2096033 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zytor.com; s=2019061801; t=1561198015; bh=ggow0bmMjMVkEEmAaUWndDinrMpea4Ej0FNVo4xhXx4=; h=Date:From:Cc:Reply-To:In-Reply-To:References:To:Subject:From; b=x0bB0RcOpcrluLIR4bJZZQ2L0bH1Zb2THzaIXNw4OoW19GscSwT+0p6dXxbdnhO+6 xfyNPKhRyph9NAdkKJbMZfu3QwW47BFDJoLZRktzyu48fp2gLnjqmPZ0z63PgoXquu llEp0VA6yA147OYYWRcF8Cw2SpG8auJOkvXDfON77QJO3oSSQ8tHLiQFF+wNMm+xtT FoCcuasWDMQ9Bukrt2rFqkxxBpZ4pjF1fzJHoXYHgVhEMrxZoJrvvHZKxRdPGjOA7d HhlX0/XINvKGZT2IjI6qrn2TPmP/F0dWx5fFixvys6JoSDjrwNr4YjeCIfkfDKybov Q8SbWGadQ0/hA== Received: (from tipbot@localhost) by terminus.zytor.com (8.15.2/8.15.2/Submit) id x5MA6sxC2096030; Sat, 22 Jun 2019 03:06:54 -0700 Date: Sat, 22 Jun 2019 03:06:54 -0700 X-Authentication-Warning: terminus.zytor.com: tipbot set sender to tipbot@zytor.com using -f From: tip-bot for Andi Kleen Message-ID: Cc: mingo@kernel.org, ak@linux.intel.com, linux-kernel@vger.kernel.org, chang.seok.bae@intel.com, tglx@linutronix.de, hpa@zytor.com, luto@kernel.org, ravi.v.shankar@intel.com Reply-To: tglx@linutronix.de, luto@kernel.org, ravi.v.shankar@intel.com, hpa@zytor.com, linux-kernel@vger.kernel.org, chang.seok.bae@intel.com, mingo@kernel.org, ak@linux.intel.com In-Reply-To: <1557309753-24073-6-git-send-email-chang.seok.bae@intel.com> References: <1557309753-24073-6-git-send-email-chang.seok.bae@intel.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/cpu] x86/fsgsbase/64: Add intrinsics for FSGSBASE instructions Git-Commit-ID: 8b71340d702ec5d587443b38a852671c4fb6a723 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 8b71340d702ec5d587443b38a852671c4fb6a723 Gitweb: https://git.kernel.org/tip/8b71340d702ec5d587443b38a852671c4fb6a723 Author: Andi Kleen AuthorDate: Wed, 8 May 2019 03:02:20 -0700 Committer: Thomas Gleixner CommitDate: Sat, 22 Jun 2019 11:38:52 +0200 x86/fsgsbase/64: Add intrinsics for FSGSBASE instructions [ luto: Rename the variables from FS and GS to FSBASE and GSBASE and make safe to include on 32-bit kernels. ] Signed-off-by: Andi Kleen Signed-off-by: Andy Lutomirski Signed-off-by: Chang S. Bae Signed-off-by: Thomas Gleixner Reviewed-by: Andy Lutomirski Reviewed-by: Andi Kleen Cc: Ravi Shankar Cc: H. Peter Anvin Link: https://lkml.kernel.org/r/1557309753-24073-6-git-send-email-chang.seok.bae@intel.com --- arch/x86/include/asm/fsgsbase.h | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/arch/x86/include/asm/fsgsbase.h b/arch/x86/include/asm/fsgsbase.h index bca4c743de77..fdd1177499b4 100644 --- a/arch/x86/include/asm/fsgsbase.h +++ b/arch/x86/include/asm/fsgsbase.h @@ -19,6 +19,36 @@ extern unsigned long x86_gsbase_read_task(struct task_struct *task); extern void x86_fsbase_write_task(struct task_struct *task, unsigned long fsbase); extern void x86_gsbase_write_task(struct task_struct *task, unsigned long gsbase); +/* Must be protected by X86_FEATURE_FSGSBASE check. */ + +static __always_inline unsigned long rdfsbase(void) +{ + unsigned long fsbase; + + asm volatile("rdfsbase %0" : "=r" (fsbase) :: "memory"); + + return fsbase; +} + +static __always_inline unsigned long rdgsbase(void) +{ + unsigned long gsbase; + + asm volatile("rdgsbase %0" : "=r" (gsbase) :: "memory"); + + return gsbase; +} + +static __always_inline void wrfsbase(unsigned long fsbase) +{ + asm volatile("wrfsbase %0" :: "r" (fsbase) : "memory"); +} + +static __always_inline void wrgsbase(unsigned long gsbase) +{ + asm volatile("wrgsbase %0" :: "r" (gsbase) : "memory"); +} + /* Helper functions for reading/writing FS/GS base */ static inline unsigned long x86_fsbase_read_cpu(void)