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: 11661685 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 BD3C8913 for ; Tue, 14 Jul 2020 07:04:20 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 942C122205 for ; Tue, 14 Jul 2020 07:04:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 942C122205 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 717258D0009; Tue, 14 Jul 2020 03:04:17 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 6C6998D0006; Tue, 14 Jul 2020 03:04:17 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 541428D0009; Tue, 14 Jul 2020 03:04:17 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0147.hostedemail.com [216.40.44.147]) by kanga.kvack.org (Postfix) with ESMTP id 333628D0006 for ; Tue, 14 Jul 2020 03:04:17 -0400 (EDT) Received: from smtpin17.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id E0BF1181AC9C6 for ; Tue, 14 Jul 2020 07:04:16 +0000 (UTC) X-FDA: 77035792512.17.room55_2014da226eef Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin17.hostedemail.com (Postfix) with ESMTP id AEB67180D0194 for ; Tue, 14 Jul 2020 07:04:16 +0000 (UTC) X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,ira.weiny@intel.com,,RULES_HIT:30030:30054:30064:30090,0,RBL:134.134.136.65:@intel.com:.lbl8.mailshell.net-62.18.0.100 64.95.201.95;04y8eso8g9684sz7f9zdbp15n9tynyp6kxf7ftnbegz8zf91fkfgdteqm7euif6.kwp1hu1b3q96mmy6r4rzqnhimgpbaop96sb1of78xqsdd3psqxh436mhggzh7zu.1-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:ft,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:24,LUA_SUMMARY:none X-HE-Tag: room55_2014da226eef X-Filterd-Recvd-Size: 3762 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by imf15.hostedemail.com (Postfix) with ESMTP for ; Tue, 14 Jul 2020 07:04:15 +0000 (UTC) IronPort-SDR: iiKNSBlWQLebK/T+X/m7PFsjyWW9ekRHPSYSjren67h1DPNE2PZAHgIlpkRVU66M3j6E7UCvSQ YIKGK72GeqIw== X-IronPort-AV: E=McAfee;i="6000,8403,9681"; a="148828673" X-IronPort-AV: E=Sophos;i="5.75,350,1589266800"; d="scan'208";a="148828673" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Jul 2020 00:04:14 -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 X-Rspamd-Queue-Id: AEB67180D0194 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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);