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=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 E5DDDC41604 for ; Fri, 17 Jul 2020 07:22:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C4C44207E8 for ; Fri, 17 Jul 2020 07:22:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728329AbgGQHWK (ORCPT ); Fri, 17 Jul 2020 03:22:10 -0400 Received: from mga17.intel.com ([192.55.52.151]:20243 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728017AbgGQHVF (ORCPT ); Fri, 17 Jul 2020 03:21:05 -0400 IronPort-SDR: xbw9HOsH0CKThNWWvjalevgbyGZJ+oPXCU1v5yYYEbSX5fmrxdRos3zo08Ti5TJm128dYapz9F c6BIXzgWpOnw== X-IronPort-AV: E=McAfee;i="6000,8403,9684"; a="129632997" X-IronPort-AV: E=Sophos;i="5.75,362,1589266800"; d="scan'208";a="129632997" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jul 2020 00:21:04 -0700 IronPort-SDR: 4zwRcwamzur591b0APcoSq3hW8wylsw0cAqcpjKNMF8iH8HcKZLa37STEc1jY9FgE2B4hxhh1+ 0G1zRQBjWkzQ== X-IronPort-AV: E=Sophos;i="5.75,362,1589266800"; d="scan'208";a="361271089" Received: from iweiny-desk2.sc.intel.com (HELO localhost) ([10.3.52.147]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jul 2020 00:21:03 -0700 From: ira.weiny@intel.com To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Andy Lutomirski , Peter Zijlstra Cc: Fenghua Yu , x86@kernel.org, Dave Hansen , Dan Williams , Vishal Verma , Ira Weiny , Andrew Morton , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: [PATCH RFC V2 06/17] x86/pks: Add a debugfs file for allocated PKS keys Date: Fri, 17 Jul 2020 00:20:45 -0700 Message-Id: <20200717072056.73134-7-ira.weiny@intel.com> X-Mailer: git-send-email 2.28.0.rc0.12.gb6a658bd00c9 In-Reply-To: <20200717072056.73134-1-ira.weiny@intel.com> References: <20200717072056.73134-1-ira.weiny@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org From: Fenghua Yu The sysadmin may need to know which PKS keys are currently being used. Add a debugfs file to show the allocated PKS keys and their names. Signed-off-by: Fenghua Yu --- arch/x86/mm/pkeys.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/arch/x86/mm/pkeys.c b/arch/x86/mm/pkeys.c index 16f735c12fcd..e565fadd74d7 100644 --- a/arch/x86/mm/pkeys.c +++ b/arch/x86/mm/pkeys.c @@ -328,3 +328,43 @@ void pks_key_free(int pkey) mutex_unlock(&pks_lock); } EXPORT_SYMBOL_GPL(pks_key_free); + +static int pks_keys_allocated_show(struct seq_file *m, void *p) +{ + int i; + + mutex_lock(&pks_lock); + for (i = PKS_KERN_DEFAULT_KEY; i < PKS_NUM_KEYS; i++) { + /* It is ok for pks_key_users[i] to be NULL */ + if (test_bit(i, &pks_key_allocation_map)) + seq_printf(m, "%d: %s\n", i, pks_key_users[i]); + } + mutex_unlock(&pks_lock); + + return 0; +} + +static int pks_keys_allocated_open(struct inode *inode, struct file *file) +{ + return single_open(file, pks_keys_allocated_show, NULL); +} + +static const struct file_operations pks_keys_allocated_fops = { + .open = pks_keys_allocated_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int __init pks_keys_initcall(void) +{ + if (cpu_feature_enabled(X86_FEATURE_PKS)) { + /* Create a debugfs file to show allocated PKS keys. */ + debugfs_create_file("pks_keys_allocated", 0400, + arch_debugfs_dir, NULL, + &pks_keys_allocated_fops); + } + + return 0; +} +late_initcall(pks_keys_initcall); -- 2.28.0.rc0.12.gb6a658bd00c9