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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3D9E1C433F5 for ; Sun, 7 Nov 2021 17:59:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1735F61078 for ; Sun, 7 Nov 2021 17:59:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236069AbhKGSBq (ORCPT ); Sun, 7 Nov 2021 13:01:46 -0500 Received: from mga11.intel.com ([192.55.52.93]:19368 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236134AbhKGSBk (ORCPT ); Sun, 7 Nov 2021 13:01:40 -0500 X-IronPort-AV: E=McAfee;i="6200,9189,10161"; a="229581374" X-IronPort-AV: E=Sophos;i="5.87,216,1631602800"; d="scan'208";a="229581374" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Nov 2021 09:58:33 -0800 X-IronPort-AV: E=Sophos;i="5.87,216,1631602800"; d="scan'208";a="451201972" Received: from akirasen-mobl.amr.corp.intel.com (HELO [10.209.44.100]) ([10.209.44.100]) by orsmga006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Nov 2021 09:58:31 -0800 Subject: Re: [PATCH 0/5] x86: Show in sysfs if a memory node is able to do encryption To: "Williams, Dan J" , "linux-efi@vger.kernel.org" , "platform-driver-x86@vger.kernel.org" , "martin.fernandez@eclypsium.com" Cc: "ardb@kernel.org" , "Lutomirski, Andy" , "dvhart@infradead.org" , "Schofield, Alison" , "dave.hansen@linux.intel.com" , "hughsient@gmail.com" , "mingo@redhat.com" , "tglx@linutronix.de" , "alex@eclypsium.com" , "hpa@zytor.com" , "peterz@infradead.org" , "bp@alien8.de" , "gregkh@linuxfoundation.org" , "rafael@kernel.org" , "daniel.gutson@eclypsium.com" , "andy@infradead.org" , "x86@kernel.org" References: <20211105212724.2640-1-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: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: platform-driver-x86@vger.kernel.org On 11/6/21 2:35 PM, Williams, Dan J wrote: > On Fri, 2021-11-05 at 18:27 -0300, Martin Fernandez wrote: >> Show for each node if every memory descriptor in that node has the >> EFI_MEMORY_CPU_CRYPTO attribute. > > The problem I have with EFI_MEMORY_CPU_CRYPTO is it that is vague what > memory encryption technology is deployed and does not tell you anything > about whether it is in effect or not. Would this be better if it were more detailed than a binary 0/1 for being crypto-capable? We do some pretty detailed descriptions of things like: > # cat /sys/devices/system/cpu/vulnerabilities/spectre_v2 > Mitigation: Full generic retpoline, IBPB: conditional, IBRS_FW, STIBP: conditional, RSB filling We could do something in this case like: # cat /sys/devices/system/node/node0/crypto_capable Yes, EFI CPU Crypto Capable, TME active