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=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, 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 A2566C432C0 for ; Wed, 27 Nov 2019 22:10:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7080E215F1 for ; Wed, 27 Nov 2019 22:10:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727233AbfK0WKF (ORCPT ); Wed, 27 Nov 2019 17:10:05 -0500 Received: from mx2.suse.de ([195.135.220.15]:41392 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726947AbfK0WKF (ORCPT ); Wed, 27 Nov 2019 17:10:05 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 395CFB3DC; Wed, 27 Nov 2019 22:10:03 +0000 (UTC) From: Michal Suchanek To: linuxppc-dev@lists.ozlabs.org Cc: Michal Suchanek , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Diana Craciun , Josh Poimboeuf , Anthony Steinhauser , "Gustavo L. F. Walbon" , YueHaibing , Geert Uytterhoeven , "Christopher M. Riedl" , linux-kernel@vger.kernel.org Subject: [PATCH] powerpc: add link stack flush mitigation status in debugfs. Date: Wed, 27 Nov 2019 23:09:59 +0100 Message-Id: <20191127220959.6208-1-msuchanek@suse.de> X-Mailer: git-send-email 2.23.0 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 The link stack flush status is not visible in debugfs. It can be enabled even when count cache flush is disabled. Add separate file for its status. Signed-off-by: Michal Suchanek --- arch/powerpc/kernel/security.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c index 7d4b2080a658..56dce4798a4d 100644 --- a/arch/powerpc/kernel/security.c +++ b/arch/powerpc/kernel/security.c @@ -446,14 +446,26 @@ static int count_cache_flush_get(void *data, u64 *val) return 0; } +static int link_stack_flush_get(void *data, u64 *val) +{ + *val = link_stack_flush_enabled; + + return 0; +} + DEFINE_DEBUGFS_ATTRIBUTE(fops_count_cache_flush, count_cache_flush_get, count_cache_flush_set, "%llu\n"); +DEFINE_DEBUGFS_ATTRIBUTE(fops_link_stack_flush, link_stack_flush_get, + count_cache_flush_set, "%llu\n"); static __init int count_cache_flush_debugfs_init(void) { debugfs_create_file_unsafe("count_cache_flush", 0600, powerpc_debugfs_root, NULL, &fops_count_cache_flush); + debugfs_create_file_unsafe("link_stack_flush", 0600, + powerpc_debugfs_root, NULL, + &fops_link_stack_flush); return 0; } device_initcall(count_cache_flush_debugfs_init); -- 2.23.0