From patchwork Sun Mar 17 21:14:40 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 10856615 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 417FB1390 for ; Sun, 17 Mar 2019 21:17:08 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2857C291EE for ; Sun, 17 Mar 2019 21:17:08 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 18B4229214; Sun, 17 Mar 2019 21:17:08 +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=ham 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 B4899291EE for ; Sun, 17 Mar 2019 21:17:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726446AbfCQVRH (ORCPT ); Sun, 17 Mar 2019 17:17:07 -0400 Received: from mga07.intel.com ([134.134.136.100]:4078 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726452AbfCQVRH (ORCPT ); Sun, 17 Mar 2019 17:17:07 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga105.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Mar 2019 14:17:06 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.58,491,1544515200"; d="scan'208";a="142816891" Received: from vanderss-mobl1.ger.corp.intel.com (HELO localhost) ([10.249.254.193]) by orsmga002.jf.intel.com with ESMTP; 17 Mar 2019 14:16:58 -0700 From: Jarkko Sakkinen To: x86@kernel.org, linux-sgx@vger.kernel.org Cc: akpm@linux-foundation.org, dave.hansen@intel.com, sean.j.christopherson@intel.com, nhorman@redhat.com, npmccallum@redhat.com, serge.ayoun@intel.com, shay.katz-zamir@intel.com, haitao.huang@intel.com, andriy.shevchenko@linux.intel.com, tglx@linutronix.de, kai.svahn@intel.com, bp@alien8.de, josh@joshtriplett.org, luto@kernel.org, kai.huang@intel.com, rientjes@google.com, Jarkko Sakkinen Subject: [PATCH v19 11/27] x86/sgx: Add definitions for SGX's CPUID leaf and variable sub-leafs Date: Sun, 17 Mar 2019 23:14:40 +0200 Message-Id: <20190317211456.13927-12-jarkko.sakkinen@linux.intel.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190317211456.13927-1-jarkko.sakkinen@linux.intel.com> References: <20190317211456.13927-1-jarkko.sakkinen@linux.intel.com> MIME-Version: 1.0 Sender: linux-sgx-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP SGX defines its own CPUID leaf, 0x12, along with a variable number of sub-leafs. Sub-leafs 0 and 1 are always available if SGX is supported and enumerate various SGX features, e.g. instruction sets and enclave capabilities. Sub-leafs 2+ are variable, both in their existence and in what they enumerate. Bits 3:0 of EAX report the sub-leaf type, with the remaining bits in EAX, EBX, ECX and EDX being type-specific. Currently, the only known sub-leaf type enumerates an EPC section. An EPC section is simply a range of EPC memory available to software. The "list" of varaible SGX sub-leafs is NULL-terminated, i.e. software is expected to query CPUID until an invalid sub-leaf is encountered. Signed-off-by: Jarkko Sakkinen Co-developed-by: Sean Christopherson Signed-off-by: Sean Christopherson --- arch/x86/kernel/cpu/sgx/arch.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/x86/kernel/cpu/sgx/arch.h b/arch/x86/kernel/cpu/sgx/arch.h index 7a2f293db32c..e966cdd68040 100644 --- a/arch/x86/kernel/cpu/sgx/arch.h +++ b/arch/x86/kernel/cpu/sgx/arch.h @@ -10,6 +10,21 @@ #include +#define SGX_CPUID 0x12 +#define SGX_CPUID_FIRST_VARIABLE_SUB_LEAF 2 + +/** + * enum sgx_sub_leaf_types - SGX CPUID variable sub-leaf types + * %SGX_CPUID_SUB_LEAF_INVALID: Indicates this sub-leaf is invalid. + * %SGX_CPUID_SUB_LEAF_EPC_SECTION: Sub-leaf enumerates an EPC section. + * %SGX_CPUID_SUB_LEAF_TYPE_MASK: Mask for bits containing the type. + */ +enum sgx_sub_leaf_types { + SGX_CPUID_SUB_LEAF_INVALID = 0x0, + SGX_CPUID_SUB_LEAF_EPC_SECTION = 0x1, + SGX_CPUID_SUB_LEAF_TYPE_MASK = GENMASK(3, 0), +}; + /** * enum sgx_encls_leaves - ENCLS leaf functions * %SGX_ECREATE: Create an enclave.