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=-7.6 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 BBF30C433FE for ; Fri, 10 Sep 2021 21:42:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9898D6120A for ; Fri, 10 Sep 2021 21:42:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234634AbhIJVne (ORCPT ); Fri, 10 Sep 2021 17:43:34 -0400 Received: from mga04.intel.com ([192.55.52.120]:36799 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229543AbhIJVnd (ORCPT ); Fri, 10 Sep 2021 17:43:33 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10103"; a="219318190" X-IronPort-AV: E=Sophos;i="5.85,284,1624345200"; d="scan'208";a="219318190" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Sep 2021 14:42:22 -0700 X-IronPort-AV: E=Sophos;i="5.85,284,1624345200"; d="scan'208";a="540949048" Received: from twxiong-mobl1.amr.corp.intel.com (HELO [10.212.164.162]) ([10.212.164.162]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Sep 2021 14:42:20 -0700 Subject: Re: [PATCH 1/1] x86: Export information about hardware memory encryption to sysfs To: Martin Fernandez , linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, ardb@kernel.org, dvhart@infradead.org, andy@infradead.org, gregkh@linuxfoundation.org, rafael@kernel.org, daniel.gutson@eclypsium.com, hughsient@gmail.com References: <20210910213337.48017-1-martin.fernandez@eclypsium.com> <20210910213337.48017-2-martin.fernandez@eclypsium.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: <20210910213337.48017-2-martin.fernandez@eclypsium.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org On 9/10/21 2:33 PM, Martin Fernandez wrote: > +static void __init efi_set_mem_crypto(void) > +{ > + efi_memory_desc_t *md; > + > + efi_mem_crypto = EFI_MEM_ENCRYPTION_CAPABLE; > + > + for_each_efi_memory_desc(md) { > + switch (md->type) { > + /* System memory after ExitBootServices */ > + case EFI_LOADER_CODE: > + case EFI_LOADER_DATA: > + case EFI_BOOT_SERVICES_CODE: > + case EFI_BOOT_SERVICES_DATA: > + case EFI_CONVENTIONAL_MEMORY: > + case EFI_ACPI_RECLAIM_MEMORY: > + if (!(md->attribute & EFI_MEMORY_CPU_CRYPTO)) { > + efi_mem_crypto = EFI_MEM_ENCRYPTION_NOT_CAPABLE; > + return; > + } > + } > + } > +} If the ABI is per-NUMA-node, shouldn't this be determining and reporting of each individual node is EFI_MEMORY_CPU_CRYPTO instead of reporting a system-wide value? I understand that this was a lot easier to hack together than doing that, but it could be extremely misleading to an end user. Would it be possible that 'efi_mem_crypto' would need to be updated on a memory hotplug event?