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=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,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 2DEFDC43381 for ; Sun, 31 Mar 2019 22:10:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 048AB2086C for ; Sun, 31 Mar 2019 22:10:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731773AbfCaWKt (ORCPT ); Sun, 31 Mar 2019 18:10:49 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:57641 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731620AbfCaWKf (ORCPT ); Sun, 31 Mar 2019 18:10:35 -0400 Received: from localhost ([127.0.0.1] helo=nanos.tec.linutronix.de) by Galois.linutronix.de with esmtp (Exim 4.80) (envelope-from ) id 1hAiev-0004rf-8B; Mon, 01 Apr 2019 00:10:33 +0200 Message-Id: <20190331215136.039902969@linutronix.de> User-Agent: quilt/0.65 Date: Sun, 31 Mar 2019 23:40:34 +0200 From: Thomas Gleixner To: LKML Cc: x86@kernel.org, Andy Lutomirski , Josh Poimboeuf Subject: [patch 14/14] x86/exceptions: Enable IST guard pages References: <20190331214020.836098943@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org All usage sites which expected that the exception stacks in the CPU entry area are mapped linearly are fixed up. Enable guard pages between the IST stacks. Signed-off-by: Thomas Gleixner --- arch/x86/include/asm/cpu_entry_area.h | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) --- a/arch/x86/include/asm/cpu_entry_area.h +++ b/arch/x86/include/asm/cpu_entry_area.h @@ -25,13 +25,9 @@ struct exception_stacks { ESTACKS_MEMBERS(0) }; -/* - * The effective cpu entry area mapping with guard pages. Guard size is - * zero until the code which makes assumptions about linear mapping is - * cleaned up. - */ +/* The effective cpu_entry_area mapping with guard pages */ struct cea_exception_stacks { - ESTACKS_MEMBERS(0) + ESTACKS_MEMBERS(PAGE_SIZE) }; #endif