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_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable 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 CE961C433DB for ; Tue, 26 Jan 2021 16:24:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9B95422473 for ; Tue, 26 Jan 2021 16:24:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392840AbhAZQYn (ORCPT ); Tue, 26 Jan 2021 11:24:43 -0500 Received: from mga12.intel.com ([192.55.52.136]:11143 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2392833AbhAZQUL (ORCPT ); Tue, 26 Jan 2021 11:20:11 -0500 IronPort-SDR: Svs+UayE6nTHvCa1jMuaL313MripE8O2yY0+y0myMMD8OK/vEpBU1kheQHc23e9yOxW6D7dQms 9SZMjmWUXYFQ== X-IronPort-AV: E=McAfee;i="6000,8403,9876"; a="159103220" X-IronPort-AV: E=Sophos;i="5.79,375,1602572400"; d="scan'208";a="159103220" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jan 2021 08:19:28 -0800 IronPort-SDR: XQaf9syrw8ta8wzGMBajh0AfIpm/bAkuxgeSOaYMV9yBa40+IF3/t67CFn6FA0mmrXK7moQ3/O gqGaj8BxJGzA== X-IronPort-AV: E=Sophos;i="5.79,375,1602572400"; d="scan'208";a="369152507" Received: from ekfraser-mobl1.amr.corp.intel.com (HELO [10.209.173.94]) ([10.209.173.94]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jan 2021 08:19:25 -0800 Subject: Re: [RFC PATCH v3 06/27] x86/sgx: Introduce virtual EPC for use by KVM guests 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, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com References: <8492ee41e947aa8151007e5ecbd9ef8914dd8827.1611634586.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: <8492ee41e947aa8151007e5ecbd9ef8914dd8827.1611634586.git.kai.huang@intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org I'd also like to see some comments about code sharing between this and the main driver. For instance, this *could* try to share 99% of the ->fault function. Why doesn't it? I'm sure there's a good reason. > diff --git a/arch/x86/kernel/cpu/sgx/virt.c b/arch/x86/kernel/cpu/sgx/virt.c > new file mode 100644 > index 000000000000..e1ad7856d878 > --- /dev/null > +++ b/arch/x86/kernel/cpu/sgx/virt.c > @@ -0,0 +1,254 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* Copyright(c) 2016-20 Intel Corporation. */ > + > +#define pr_fmt(fmt) "SGX virtual EPC: " fmt Does this actually get used anywhere? Also, isn't this a bit long? Maybe: #define pr_fmt(fmt) "sgx/virt: " fmt Also, a one-line summary about what's in here would be nice next to the copyright (which needs to be updated). /* * Device driver to expose SGX enclave memory to KVM guests. * * Copyright(c) 2016-20 Intel Corporation. */ > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#include "encls.h" > +#include "sgx.h" > +#include "virt.h" > + > +struct sgx_vepc { > + struct xarray page_array; > + struct mutex lock; > +}; > + > +static struct mutex zombie_secs_pages_lock; > +static struct list_head zombie_secs_pages; Comments would be nice for this random lock and list. The main core functions (fault, etc...) are looking OK to me. ... > +int __init sgx_vepc_init(void) > +{ > + /* SGX virtualization requires KVM to work */ > + if (!boot_cpu_has(X86_FEATURE_VMX) || !IS_ENABLED(CONFIG_KVM_INTEL)) > + return -ENODEV; Can this even be built without IS_ENABLED(CONFIG_KVM_INTEL)? > + INIT_LIST_HEAD(&zombie_secs_pages); > + mutex_init(&zombie_secs_pages_lock); > + > + return misc_register(&sgx_vepc_dev); > +} > diff --git a/arch/x86/kernel/cpu/sgx/virt.h b/arch/x86/kernel/cpu/sgx/virt.h > new file mode 100644 > index 000000000000..44d872380ca1 > --- /dev/null > +++ b/arch/x86/kernel/cpu/sgx/virt.h > @@ -0,0 +1,14 @@ > +/* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */ > +#ifndef _ASM_X86_SGX_VIRT_H > +#define _ASM_X86_SGX_VIRT_H > + > +#ifdef CONFIG_X86_SGX_KVM > +int __init sgx_vepc_init(void); > +#else > +static inline int __init sgx_vepc_init(void) > +{ > + return -ENODEV; > +} > +#endif > + > +#endif /* _ASM_X86_SGX_VIRT_H */ Is more going to go in this header? It's a little sparse as-is.