From patchwork Tue Jan 26 09:31:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12045965 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 B64C6C433DB for ; Tue, 26 Jan 2021 09:33:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6BDDE23109 for ; Tue, 26 Jan 2021 09:33:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730309AbhAZJc4 (ORCPT ); Tue, 26 Jan 2021 04:32:56 -0500 Received: from mga03.intel.com ([134.134.136.65]:12748 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391185AbhAZJbr (ORCPT ); Tue, 26 Jan 2021 04:31:47 -0500 IronPort-SDR: mXX9DhvXVC9dWvDjUFDE1OuMHxs2odvitvnTyW2ObbEGCpFlYWlmtk3GrFFREwkFW7gGzq61P9 WgKz3pwu479Q== X-IronPort-AV: E=McAfee;i="6000,8403,9875"; a="179954881" X-IronPort-AV: E=Sophos;i="5.79,375,1602572400"; d="scan'208";a="179954881" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jan 2021 01:31:21 -0800 IronPort-SDR: fh8WUTMAPe4Qujz+F3pL/se8p50TznUJyf4MZbDe8h7GQvMZTO79e3t0r9w1xBun3+LMNofGiZ 3WQxdUrfsLig== X-IronPort-AV: E=Sophos;i="5.79,375,1602572400"; d="scan'208";a="577747650" Received: from ravivisw-mobl1.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.254.124.51]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jan 2021 01:31:17 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, Kai Huang Subject: [RFC PATCH v3 08/27] x86/sgx: Initialize virtual EPC driver even when SGX driver is disabled Date: Tue, 26 Jan 2021 22:31:00 +1300 Message-Id: <5076ed2c486ac33bfd87dc0e17047a1673692b53.1611634586.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org Modify sgx_init() to always try to initialize the virtual EPC driver, even if the bare-metal SGX driver is disabled. The bare-metal driver might be disabled if SGX Launch Control is in locked mode, or not supported in the hardware at all. This allows (non-Linux) guests that support non-LC configurations to use SGX. Signed-off-by: Kai Huang --- v2->v3: - Changed from sgx_virt_epc_init() to sgx_vepc_init(). --- arch/x86/kernel/cpu/sgx/main.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c index 21c2ffa13870..93d249f7bff3 100644 --- a/arch/x86/kernel/cpu/sgx/main.c +++ b/arch/x86/kernel/cpu/sgx/main.c @@ -12,6 +12,7 @@ #include "driver.h" #include "encl.h" #include "encls.h" +#include "virt.h" struct sgx_epc_section sgx_epc_sections[SGX_MAX_EPC_SECTIONS]; static int sgx_nr_epc_sections; @@ -712,7 +713,8 @@ static int __init sgx_init(void) goto err_page_cache; } - ret = sgx_drv_init(); + /* Success if the native *or* virtual EPC driver initialized cleanly. */ + ret = !!sgx_drv_init() & !!sgx_vepc_init(); if (ret) goto err_kthread;