From mboxrd@z Thu Jan 1 00:00:00 1970 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=-10.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 7A81EC433DB for ; Tue, 16 Feb 2021 18:42:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 54B1C64E10 for ; Tue, 16 Feb 2021 18:42:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230210AbhBPSmA (ORCPT ); Tue, 16 Feb 2021 13:42:00 -0500 Received: from mga05.intel.com ([192.55.52.43]:62181 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229945AbhBPSl7 (ORCPT ); Tue, 16 Feb 2021 13:41:59 -0500 IronPort-SDR: 61j/DqjYGxz4qNHwkMjyCUsfD93EB646Fr5J8Nm1FUwqFc2fZHb7Y0u7GQMq6IFqOmG6QfIOtL O/jq2pZZTtlg== X-IronPort-AV: E=McAfee;i="6000,8403,9897"; a="267828448" X-IronPort-AV: E=Sophos;i="5.81,184,1610438400"; d="scan'208";a="267828448" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Feb 2021 10:41:19 -0800 IronPort-SDR: dp5E+o3nHerotmMO9InlZlEJa1E472pNAlAAQo49qSJK+oK9EEd3npZSg/ctBK1vLfgvfGjn/U lF/dYIpe2UFg== X-IronPort-AV: E=Sophos;i="5.81,184,1610438400"; d="scan'208";a="589333373" Received: from twblanch-mobl.amr.corp.intel.com (HELO [10.209.156.22]) ([10.209.156.22]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Feb 2021 10:41:18 -0800 Subject: Re: [RFC PATCH v5 07/26] x86/sgx: Initialize virtual EPC driver even when SGX driver is disabled To: Kai Huang , linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, rick.p.edgecombe@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com References: <1ab775bbf5212cd0b85d7a41234cccf710cb1656.1613221549.git.kai.huang@intel.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <1ab775bbf5212cd0b85d7a41234cccf710cb1656.1613221549.git.kai.huang@intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org On 2/13/21 5:29 AM, Kai Huang wrote: > 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 ... > + ret = !!sgx_drv_init() & !!sgx_vepc_init(); That little nugget is starting to grow on me. Acked-by: Dave Hansen