From patchwork Tue Jul 14 07:02:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ira Weiny X-Patchwork-Id: 11661771 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B56E21510 for ; Tue, 14 Jul 2020 07:05:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9CAC122210 for ; Tue, 14 Jul 2020 07:05:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727840AbgGNHF2 (ORCPT ); Tue, 14 Jul 2020 03:05:28 -0400 Received: from mga11.intel.com ([192.55.52.93]:63464 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726890AbgGNHEP (ORCPT ); Tue, 14 Jul 2020 03:04:15 -0400 IronPort-SDR: tbX199lH6+gxoeI89r9ex3VBW/twRf3oWwEnCQqLdU4FfTnUFU66rAbnrVblQlvOwVjbghLN1h JQu4qXWOtYJQ== X-IronPort-AV: E=McAfee;i="6000,8403,9681"; a="146839879" X-IronPort-AV: E=Sophos;i="5.75,350,1589266800"; d="scan'208";a="146839879" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Jul 2020 00:04:11 -0700 IronPort-SDR: 2S/nvFjzQ392JiaSqjcp8ScDg96hb1apbpi4JcpWqJ5/phFArv7EiT3mk7FEux00XHBnw/HaLS IAyf6X3DxdnQ== X-IronPort-AV: E=Sophos;i="5.75,350,1589266800"; d="scan'208";a="324463867" Received: from iweiny-desk2.sc.intel.com (HELO localhost) ([10.3.52.147]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Jul 2020 00:04:11 -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: [RFC PATCH 06/15] x86/pks: Add a debugfs file for allocated PKS keys Date: Tue, 14 Jul 2020 00:02:11 -0700 Message-Id: <20200714070220.3500839-7-ira.weiny@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200714070220.3500839-1-ira.weiny@intel.com> References: <20200714070220.3500839-1-ira.weiny@intel.com> MIME-Version: 1.0 Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@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);