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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,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 26726C1975A for ; Tue, 17 Mar 2020 20:35:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EEE0C20714 for ; Tue, 17 Mar 2020 20:35:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726775AbgCQUfO (ORCPT ); Tue, 17 Mar 2020 16:35:14 -0400 Received: from mga17.intel.com ([192.55.52.151]:17562 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726388AbgCQUfO (ORCPT ); Tue, 17 Mar 2020 16:35:14 -0400 IronPort-SDR: 5Wl964iVNXgMWWoZ6tUZ9b2p+r+9Xl1+XfIgK2geAMcZpPHKaiWMRp+swJIuFElYFPunXmCBuc o6Fk9pK56/Ig== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Mar 2020 13:35:13 -0700 IronPort-SDR: xSlZJbVgHc2AKONDJ/Sljm9V3xwLfDRMe6qHvlFckW78s/QGMK4b8Va7m/tazkGak9vdmxo6Ef Jr0yudYeMmHw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,565,1574150400"; d="scan'208";a="247949524" Received: from dslea-mobl.amr.corp.intel.com (HELO [10.251.3.73]) ([10.251.3.73]) by orsmga006.jf.intel.com with ESMTP; 17 Mar 2020 13:35:12 -0700 Subject: Re: [PATCH] treewide: Rename "unencrypted" to "decrypted" To: Borislav Petkov , lkml , "Schofield, Alison" Cc: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Thomas Gleixner , Ingo Molnar , x86@kernel.org, Dave Hansen , Andy Lutomirski , Peter Zijlstra , Christoph Hellwig , Marek Szyprowski , Robin Murphy , linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, iommu@lists.linux-foundation.org, Tom Lendacky , "Shutemov, Kirill" References: <20200317111822.GA15609@zn.tnic> From: Dave Hansen Openpgp: preference=signencrypt Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20200317111822.GA15609@zn.tnic> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/17/20 4:18 AM, Borislav Petkov wrote: > Back then when the whole SME machinery started getting mainlined, it > was agreed that for simplicity, clarity and sanity's sake, the terms > denoting encrypted and not-encrypted memory should be "encrypted" and > "decrypted". And the majority of the code sticks to that convention > except those two. So rename them. Don't "unencrypted" and "decrypted" mean different things? Unencrypted to me means "encryption was never used for this data". Decrypted means "this was/is encrypted but here is a plaintext copy". This, for instance: > +++ b/kernel/dma/direct.c > @@ -26,7 +26,7 @@ unsigned int zone_dma_bits __ro_after_init = 24; > static inline dma_addr_t phys_to_dma_direct(struct device *dev, > phys_addr_t phys) > { > - if (force_dma_unencrypted(dev)) > + if (force_dma_decrypted(dev)) > return __phys_to_dma(dev, phys); is referring to DMA that is not and never was encrypted. It's skipping the encryption altogether. There's no act of "decryption" anywhere. This, on the other hand, seems named wrong to me: > /* > * Macros to add or remove encryption attribute > */ > #define pgprot_encrypted(prot) __pgprot(__sme_set(pgprot_val(prot))) > #define pgprot_decrypted(prot) __pgprot(__sme_clr(pgprot_val(prot))) This seems like it would be better named pgprot_unencrypted().