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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED 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 384ABC4321E for ; Fri, 7 Sep 2018 19:52:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E24862075E for ; Fri, 7 Sep 2018 19:52:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E24862075E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727736AbeIHAfS (ORCPT ); Fri, 7 Sep 2018 20:35:18 -0400 Received: from mga12.intel.com ([192.55.52.136]:44940 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726107AbeIHAfR (ORCPT ); Fri, 7 Sep 2018 20:35:17 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 07 Sep 2018 12:52:50 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.53,343,1531810800"; d="scan'208";a="260780738" Received: from viggo.jf.intel.com (HELO localhost.localdomain) ([10.54.77.144]) by fmsmga005.fm.intel.com with ESMTP; 07 Sep 2018 12:51:28 -0700 Subject: [RFC][PATCH 3/8] x86/mm: break out user address space handling To: linux-kernel@vger.kernel.org Cc: Dave Hansen , sean.j.christopherson@intel.com, peterz@infradead.org, tglx@linutronix.de, x86@kernel.org, luto@kernel.org From: Dave Hansen Date: Fri, 07 Sep 2018 12:48:57 -0700 References: <20180907194852.3C351B82@viggo.jf.intel.com> In-Reply-To: <20180907194852.3C351B82@viggo.jf.intel.com> Message-Id: <20180907194857.93621ACE@viggo.jf.intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dave Hansen The last patch broke out kernel address space handing into its own helper. Now, do the same for user address space handling. Signed-off-by: Dave Hansen Cc: Sean Christopherson Cc: "Peter Zijlstra (Intel)" Cc: Thomas Gleixner Cc: x86@kernel.org Cc: Andy Lutomirski --- b/arch/x86/mm/fault.c | 47 ++++++++++++++++++++++++++++------------------- 1 file changed, 28 insertions(+), 19 deletions(-) diff -puN arch/x86/mm/fault.c~pkeys-fault-warnings-01 arch/x86/mm/fault.c --- a/arch/x86/mm/fault.c~pkeys-fault-warnings-01 2018-09-07 11:21:46.663751901 -0700 +++ b/arch/x86/mm/fault.c 2018-09-07 11:21:46.667751901 -0700 @@ -1203,6 +1203,7 @@ static inline bool smap_violation(int er return true; } +/* Handle faults in the kernel portion of the address space */ static void do_kern_addr_space_fault(struct pt_regs *regs, unsigned long hw_error_code, unsigned long address) @@ -1252,14 +1253,11 @@ do_kern_addr_space_fault(struct pt_regs } NOKPROBE_SYMBOL(do_kern_addr_space_fault); -/* - * This routine handles page faults. It determines the address, - * and the problem, and then passes it off to one of the appropriate - * routines. - */ -static noinline void -__do_page_fault(struct pt_regs *regs, unsigned long hw_error_code, - unsigned long address) +/* Handle faults in the user portion of the address space */ +static inline +void do_user_addr_space_fault(struct pt_regs *regs, + unsigned long hw_error_code, + unsigned long address) { unsigned long sw_error_code; struct vm_area_struct *vma; @@ -1272,17 +1270,6 @@ __do_page_fault(struct pt_regs *regs, un tsk = current; mm = tsk->mm; - prefetchw(&mm->mmap_sem); - - if (unlikely(kmmio_fault(regs, address))) - return; - - /* Was the fault on kernel-controlled part of the address space? */ - if (unlikely(fault_in_kernel_space(address))) { - do_kern_addr_space_fault(regs, hw_error_code, address); - return; - } - /* kprobes don't want to hook the spurious faults: */ if (unlikely(kprobes_fault(regs))) return; @@ -1486,6 +1473,28 @@ good_area: check_v8086_mode(regs, address, tsk); } +NOKPROBE_SYMBOL(do_user_addr_space_fault); + +/* + * This routine handles page faults. It determines the address, + * and the problem, and then passes it off to one of the appropriate + * routines. + */ +static noinline void +__do_page_fault(struct pt_regs *regs, unsigned long hw_error_code, + unsigned long address) +{ + prefetchw(¤t->mm->mmap_sem); + + if (unlikely(kmmio_fault(regs, address))) + return; + + /* Was the fault on kernel-controlled part of the address space? */ + if (unlikely(fault_in_kernel_space(address))) + do_kern_addr_space_fault(regs, hw_error_code, address); + else + do_user_addr_space_fault(regs, hw_error_code, address); +} NOKPROBE_SYMBOL(__do_page_fault); static nokprobe_inline void _