From patchwork Wed May 8 14:43:48 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kirill A . Shutemov" X-Patchwork-Id: 10935981 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2C867924 for ; Wed, 8 May 2019 14:49:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1E4692890F for ; Wed, 8 May 2019 14:49:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1287B28988; Wed, 8 May 2019 14:49:30 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A72842890F for ; Wed, 8 May 2019 14:49:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728370AbfEHOor (ORCPT ); Wed, 8 May 2019 10:44:47 -0400 Received: from mga03.intel.com ([134.134.136.65]:59520 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728301AbfEHOop (ORCPT ); Wed, 8 May 2019 10:44:45 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 08 May 2019 07:44:44 -0700 X-ExtLoop1: 1 Received: from black.fi.intel.com ([10.237.72.28]) by fmsmga005.fm.intel.com with ESMTP; 08 May 2019 07:44:40 -0700 Received: by black.fi.intel.com (Postfix, from userid 1000) id 11A32AF7; Wed, 8 May 2019 17:44:30 +0300 (EEST) From: "Kirill A. Shutemov" To: Andrew Morton , x86@kernel.org, Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Borislav Petkov , Peter Zijlstra , Andy Lutomirski , David Howells Cc: Kees Cook , Dave Hansen , Kai Huang , Jacob Pan , Alison Schofield , linux-mm@kvack.org, kvm@vger.kernel.org, keyrings@vger.kernel.org, linux-kernel@vger.kernel.org, "Kirill A . Shutemov" Subject: [PATCH, RFC 28/62] keys/mktme: Set up PCONFIG programming targets for MKTME keys Date: Wed, 8 May 2019 17:43:48 +0300 Message-Id: <20190508144422.13171-29-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190508144422.13171-1-kirill.shutemov@linux.intel.com> References: <20190508144422.13171-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Alison Schofield MKTME Key service maintains the hardware key tables. These key tables are package scoped per the MKTME hardware definition. This means that each physical package on the system needs its key table programmed. These physical packages are the targets of the new PCONFIG programming command. So, introduce a PCONFIG targets bitmap as well as a CPU mask that includes the lead CPUs capable of programming the targets. The lead CPU mask will be used every time a new key is programmed into the hardware. Keep the PCONFIG targets bit map around for future use during hotplug events. Signed-off-by: Alison Schofield Signed-off-by: Kirill A. Shutemov --- security/keys/mktme_keys.c | 42 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/security/keys/mktme_keys.c b/security/keys/mktme_keys.c index 9fdf482ea3e6..b5b44decfd3e 100644 --- a/security/keys/mktme_keys.c +++ b/security/keys/mktme_keys.c @@ -2,6 +2,7 @@ /* Documentation/x86/mktme_keys.rst */ +#include #include #include #include @@ -17,6 +18,8 @@ static DEFINE_SPINLOCK(mktme_lock); struct kmem_cache *mktme_prog_cache; /* Hardware programming cache */ +unsigned long *mktme_target_map; /* Pconfig programming targets */ +cpumask_var_t mktme_leadcpus; /* One lead CPU per pconfig target */ /* 1:1 Mapping between Userspace Keys (struct key) and Hardware KeyIDs */ struct mktme_mapping { @@ -303,6 +306,33 @@ struct key_type key_type_mktme = { .destroy = mktme_destroy_key, }; +static void mktme_update_pconfig_targets(void) +{ + int cpu, target_id; + + cpumask_clear(mktme_leadcpus); + bitmap_clear(mktme_target_map, 0, sizeof(mktme_target_map)); + + for_each_online_cpu(cpu) { + target_id = topology_physical_package_id(cpu); + if (!__test_and_set_bit(target_id, mktme_target_map)) + __cpumask_set_cpu(cpu, mktme_leadcpus); + } +} + +static int mktme_alloc_pconfig_targets(void) +{ + if (!alloc_cpumask_var(&mktme_leadcpus, GFP_KERNEL)) + return -ENOMEM; + + mktme_target_map = bitmap_alloc(topology_max_packages(), GFP_KERNEL); + if (!mktme_target_map) { + free_cpumask_var(mktme_leadcpus); + return -ENOMEM; + } + return 0; +} + static int __init init_mktme(void) { int ret; @@ -320,9 +350,21 @@ static int __init init_mktme(void) if (!mktme_prog_cache) goto free_map; + /* Hardware programming targets */ + if (mktme_alloc_pconfig_targets()) + goto free_cache; + + /* Initialize first programming targets */ + mktme_update_pconfig_targets(); + ret = register_key_type(&key_type_mktme); if (!ret) return ret; /* SUCCESS */ + + free_cpumask_var(mktme_leadcpus); + bitmap_free(mktme_target_map); +free_cache: + kmem_cache_destroy(mktme_prog_cache); free_map: kvfree(mktme_map);