From patchwork Sat Feb 13 13:29:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12086759 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 9CAE9C433DB for ; Sat, 13 Feb 2021 13:30:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 68BA864E4C for ; Sat, 13 Feb 2021 13:30:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229636AbhBMNaM (ORCPT ); Sat, 13 Feb 2021 08:30:12 -0500 Received: from mga12.intel.com ([192.55.52.136]:59256 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229539AbhBMNaL (ORCPT ); Sat, 13 Feb 2021 08:30:11 -0500 IronPort-SDR: Iqdpjd7zJPg7gHIcLpD2j213SI5MTaSDlBWnYpT33GOmHH59k6vcHUnixBt4uQpuFMBQUm41uE 7rwE8ZORDANw== X-IronPort-AV: E=McAfee;i="6000,8403,9893"; a="161667687" X-IronPort-AV: E=Sophos;i="5.81,176,1610438400"; d="scan'208";a="161667687" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Feb 2021 05:29:30 -0800 IronPort-SDR: U577CKIIlJ5jR9egwKQqMIrLhzlnI4ODOYUbmlvXOsq8LQptWadQuc9rHFCI1hdK7cIsf5JLuJ 4TIVT31/s/Fw== X-IronPort-AV: E=Sophos;i="5.81,176,1610438400"; d="scan'208";a="398366012" Received: from kshah-mobl1.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.255.230.239]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Feb 2021 05:29:26 -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, 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: [RFC PATCH v5 07/26] x86/sgx: Initialize virtual EPC driver even when SGX driver is disabled Date: Sun, 14 Feb 2021 02:29:09 +1300 Message-Id: <1ab775bbf5212cd0b85d7a41234cccf710cb1656.1613221549.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. Signed-off-by: Kai Huang Acked-by: Dave Hansen --- v4->v5: - No code change. v3->v4: - Added comment to explain virtual EPC driver can be supported in both cases that SGX driver is not supported, or failed to initialize, per Dave and Jarkko. - Removed "virt.h" inclusion since it was removed in previous patch, per Dave. v2->v3: - Changed from sgx_virt_epc_init() to sgx_vepc_init(). --- 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;