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 1A063C433B4 for ; Tue, 18 May 2021 20:56:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E169C61028 for ; Tue, 18 May 2021 20:56:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352246AbhERU53 (ORCPT ); Tue, 18 May 2021 16:57:29 -0400 Received: from mga04.intel.com ([192.55.52.120]:39808 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230157AbhERU52 (ORCPT ); Tue, 18 May 2021 16:57:28 -0400 IronPort-SDR: JTE2RAx8cJ9PKv9e0HnTXoqrkP21rkFotI3mvCYrTFMKjXFNyPqfm6gVbxkJo3BGZPVWckd9N6 gnCbLhuTeJqA== X-IronPort-AV: E=McAfee;i="6200,9189,9988"; a="198866640" X-IronPort-AV: E=Sophos;i="5.82,310,1613462400"; d="scan'208";a="198866640" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 May 2021 13:56:08 -0700 IronPort-SDR: s06I5TTBHMH4bwu9CZzkd4l44Z+GxnDh/nQszhtHlUQKwHpbRccurmG6wlkaQwxdC2j3j4naGt kCaK/+LPFw6w== X-IronPort-AV: E=Sophos;i="5.82,310,1613462400"; d="scan'208";a="439630881" Received: from akleen-mobl1.amr.corp.intel.com (HELO [10.209.65.183]) ([10.209.65.183]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 May 2021 13:56:06 -0700 Subject: Re: [RFC v2-fix 1/1] x86/tdx: Handle in-kernel MMIO To: Sean Christopherson Cc: Dave Hansen , Kuppuswamy Sathyanarayanan , Peter Zijlstra , Andy Lutomirski , Tony Luck , Kirill Shutemov , Kuppuswamy Sathyanarayanan , Dan Williams , Raj Ashok , linux-kernel@vger.kernel.org References: <3e9a26c3-8eee-88f5-f8e2-8a2dd2c028ea@intel.com> <20210518004807.258503-1-sathyanarayanan.kuppuswamy@linux.intel.com> <36cd2665-6d8b-9c0b-eec1-25152dcca2a3@intel.com> <43e583a3-ee2b-52d8-5275-e26a6609c126@linux.intel.com> <8fb0e52c-ed0a-2185-585a-27007c27ed56@linux.intel.com> <3a037a43-435b-fc28-63d0-48e543cddfdd@linux.intel.com> From: Andi Kleen Message-ID: <387d81b4-37d6-65ac-6bc6-f96980450d4d@linux.intel.com> Date: Tue, 18 May 2021 13:56:04 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > virtio-pci, which is going to used by pretty much all traditional VMs, uses iomap. > See vp_get(), vp_set(), and all the vp_io{read,write}*() wrappers. That's true. But there are still all the other users. So it doesn't solve the problem. In the end I'm fairly sure we would need to patch readl/writel and friends. -Andi