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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 650CFC2BA19 for ; Thu, 23 Apr 2020 23:22:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4350B2077D for ; Thu, 23 Apr 2020 23:22:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587684152; bh=yvFdbGtTALACGqLsVjcL+BcUCYlfRHut042lbgnpHUI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Xx4l4tcZX6iU+XOeKZQztecEcBB5p+zhXLcVI3q4FlnL6f2WOtwJqey9Kw9+hoMfi aQ6kKsXPY/Bl3ZAXai9V8Qh0bOPyk5jwwDOrq4kmTd8E6+CbJnAxyqSCZE8Fgj2ucl E05FqtoME+lDRGTx1OMlwmDtm0y6Bkt2tbhI5lnI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728909AbgDWXWb (ORCPT ); Thu, 23 Apr 2020 19:22:31 -0400 Received: from mail.kernel.org ([198.145.29.99]:59078 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729928AbgDWXWY (ORCPT ); Thu, 23 Apr 2020 19:22:24 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E91D721D90; Thu, 23 Apr 2020 23:22:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587684144; bh=yvFdbGtTALACGqLsVjcL+BcUCYlfRHut042lbgnpHUI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ezIRzh5JKzyTczrUZ2iy1KQ0Eky1F937ON9Uu44Z3EsiwDmydqsq4Z8cGutiaeg1i 4vJxDnBwEIVfnKyfVXjq/q0K6jKNDPRGJF5Tr588xb6zJ8v6zwtpcqdkDpEsQvuAD5 vHIHEAAp3gWpKTFpNmwypno2G3s2xnJL34wRXlko= From: Sasha Levin To: linux-kernel@vger.kernel.org, tglx@linutronix.de, bp@alien8.de, luto@kernel.org Cc: hpa@zytor.com, dave.hansen@intel.com, tony.luck@intel.com, ak@linux.intel.com, ravi.v.shankar@intel.com, chang.seok.bae@intel.com, Sasha Levin Subject: [PATCH v10 09/18] x86/fsgsbase/64: Add intrinsics for FSGSBASE instructions Date: Thu, 23 Apr 2020 19:21:58 -0400 Message-Id: <20200423232207.5797-10-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200423232207.5797-1-sashal@kernel.org> References: <20200423232207.5797-1-sashal@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andi Kleen [ 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 Reviewed-by: Tony Luck Cc: Thomas Gleixner Cc: Borislav Petkov Cc: Andy Lutomirski Cc: Dave Hansen Cc: Tony Luck Cc: H. Peter Anvin Cc: Andi Kleen Signed-off-by: Sasha Levin --- 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 bca4c743de77c..fdd1177499b40 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) -- 2.20.1