From patchwork Mon Jan 18 03:27:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026319 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=-16.7 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 98626C433E0 for ; Mon, 18 Jan 2021 03:28:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 66DEC224B0 for ; Mon, 18 Jan 2021 03:28:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730132AbhARD2d (ORCPT ); Sun, 17 Jan 2021 22:28:33 -0500 Received: from mga02.intel.com ([134.134.136.20]:30517 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731643AbhARD2c (ORCPT ); Sun, 17 Jan 2021 22:28:32 -0500 IronPort-SDR: eTmZw6PkwbfBLnhkqUOmpV/wY9TC42OZAXhlDcNUq6QrVgJ/ody074/qdk2K7pxuPy2bKiVeI6 ZARc60HHFvHA== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="165843049" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="165843049" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:27:50 -0800 IronPort-SDR: FWVF7Od1x+XYTMVbnROpUWhBPiPGpotPeWgYvmbD/JLDmHozO6Q0WA/4xNb7cm/iUwyiGjkGfv tZMGuus+HCfw== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573150905" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:27:46 -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 v2 07/26] x86/sgx: Initialize virtual EPC driver even when SGX driver is disabled Date: Mon, 18 Jan 2021 16:27:38 +1300 Message-Id: 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 --- 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 5e20b42f2639..bdda631c975b 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; @@ -710,7 +711,8 @@ static void __init sgx_init(void) if (!sgx_page_reclaimer_init()) goto err_page_cache; - ret = sgx_drv_init(); + /* Success if the native *or* virtual EPC driver initialized cleanly. */ + ret = !!sgx_drv_init() & !!sgx_virt_epc_init(); if (ret) goto err_kthread;