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=-5.3 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 66689C433B4 for ; Fri, 7 May 2021 21:54:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2F6D96113E for ; Fri, 7 May 2021 21:54:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229758AbhEGVzW (ORCPT ); Fri, 7 May 2021 17:55:22 -0400 Received: from mga12.intel.com ([192.55.52.136]:12787 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229482AbhEGVzU (ORCPT ); Fri, 7 May 2021 17:55:20 -0400 IronPort-SDR: A6J+5rueivxWn6YOTeigiy+mUP2aKnvXB6BjiOj9EpvKbdQ0PCHQ1I+oZvbTJyZOtts07zNWNW fodLJdM6mbaQ== X-IronPort-AV: E=McAfee;i="6200,9189,9977"; a="178383883" X-IronPort-AV: E=Sophos;i="5.82,282,1613462400"; d="scan'208";a="178383883" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2021 14:54:20 -0700 IronPort-SDR: BLeRinuJrn26cVwXA7B8r5xsV2zWIgpGchsBQG9XCrQxbNWp1XQrtqzjK20m7pvOSOGGQ0b6gz dstBSuLjHFGQ== X-IronPort-AV: E=Sophos;i="5.82,282,1613462400"; d="scan'208";a="431679720" Received: from msandrid-mobl.amr.corp.intel.com (HELO [10.212.134.124]) ([10.212.134.124]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2021 14:54:19 -0700 Subject: Re: [RFC v2 26/32] x86/mm: Move force_dma_unencrypted() to common code To: Kuppuswamy Sathyanarayanan , Peter Zijlstra , Andy Lutomirski , Dan Williams , Tony Luck Cc: Andi Kleen , Kirill Shutemov , Kuppuswamy Sathyanarayanan , Raj Ashok , Sean Christopherson , linux-kernel@vger.kernel.org References: <7c5adf75d69ea327b22b404b7c37b29712d73640.1619458733.git.sathyanarayanan.kuppuswamy@linux.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: <7c5adf75d69ea327b22b404b7c37b29712d73640.1619458733.git.sathyanarayanan.kuppuswamy@linux.intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > +++ b/arch/x86/mm/mem_encrypt_common.c ... > +/* Override for DMA direct allocation check - ARCH_HAS_FORCE_DMA_UNENCRYPTED */ > +bool force_dma_unencrypted(struct device *dev) > +{ > + /* > + * For SEV, all DMA must be to unencrypted/shared addresses. > + */ > + if (sev_active()) > + return true; > + > + /* > + * For SME, all DMA must be to unencrypted addresses if the > + * device does not support DMA to addresses that include the > + * encryption mask. > + */ > + if (sme_active()) { > + u64 dma_enc_mask = DMA_BIT_MASK(__ffs64(sme_me_mask)); > + u64 dma_dev_mask = min_not_zero(dev->coherent_dma_mask, > + dev->bus_dma_limit); > + > + if (dma_dev_mask <= dma_enc_mask) > + return true; > + } > + > + return false; > +} This doesn't seem much like common code to me. It seems like 100% SEV code. Is this really where we want to move it?