From patchwork Mon Mar 1 09:45:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12109281 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,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 8FEFEC433E0 for ; Mon, 1 Mar 2021 09:46:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 47D55601FE for ; Mon, 1 Mar 2021 09:46:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234135AbhCAJqW (ORCPT ); Mon, 1 Mar 2021 04:46:22 -0500 Received: from mga01.intel.com ([192.55.52.88]:26445 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234110AbhCAJqI (ORCPT ); Mon, 1 Mar 2021 04:46:08 -0500 IronPort-SDR: DS8EJrJ1d9CB1fpl5gmdiZjGuxL4qN6MYvxB0eox0AYvK0XPTKqXrqA2ldtT/CEiBAOcFiW4Q5 8iC4vBO1jfiQ== X-IronPort-AV: E=McAfee;i="6000,8403,9909"; a="206015971" X-IronPort-AV: E=Sophos;i="5.81,215,1610438400"; d="scan'208";a="206015971" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Mar 2021 01:45:26 -0800 IronPort-SDR: kTFfP4sjnupJtHVztw9A5gziFlr3HnIS8Tiqfv5+Yqyk5k6dgq160voTPDBrJmhzJ1F6cFtK31 rhLYVQUXHluQ== X-IronPort-AV: E=Sophos;i="5.81,215,1610438400"; d="scan'208";a="599267466" Received: from jscomeax-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.139.76]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Mar 2021 01:45:22 -0800 From: Kai Huang To: kvm@vger.kernel.org, linux-sgx@vger.kernel.org, x86@kernel.org Cc: linux-kernel@vger.kernel.org, seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, rick.p.edgecombe@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, Kai Huang Subject: [PATCH 07/25] x86/sgx: Initialize virtual EPC driver even when SGX driver is disabled Date: Mon, 1 Mar 2021 22:45:07 +1300 Message-Id: <15ec83ad1d1409c0c35eab5f1c76b57125f3a01c.1614590788.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 SGX driver is disabled. The SGX 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. Acked-by: Dave Hansen Signed-off-by: Kai Huang --- arch/x86/kernel/cpu/sgx/main.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c index 44fe91a5bfb3..8c922e68274d 100644 --- a/arch/x86/kernel/cpu/sgx/main.c +++ b/arch/x86/kernel/cpu/sgx/main.c @@ -712,7 +712,15 @@ static int __init sgx_init(void) goto err_page_cache; } - ret = sgx_drv_init(); + /* + * Always try to initialize the native *and* KVM drivers. + * The KVM driver is less picky than the native one and + * can function if the native one is not supported on the + * current system or fails to initialize. + * + * Error out only if both fail to initialize. + */ + ret = !!sgx_drv_init() & !!sgx_vepc_init(); if (ret) goto err_kthread;