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 53482C433EF for ; Mon, 11 Oct 2021 02:40:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 33AB460F4C for ; Mon, 11 Oct 2021 02:40:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233641AbhJKCl6 (ORCPT ); Sun, 10 Oct 2021 22:41:58 -0400 Received: from mga17.intel.com ([192.55.52.151]:13178 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231578AbhJKCl4 (ORCPT ); Sun, 10 Oct 2021 22:41:56 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10133"; a="207592594" X-IronPort-AV: E=Sophos;i="5.85,363,1624345200"; d="scan'208";a="207592594" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Oct 2021 19:39:57 -0700 X-IronPort-AV: E=Sophos;i="5.85,363,1624345200"; d="scan'208";a="459805979" Received: from akleen-mobl1.amr.corp.intel.com (HELO [10.209.83.75]) ([10.209.83.75]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Oct 2021 19:39:56 -0700 Message-ID: <8c906de6-5efa-b87a-c800-6f07b98339d0@linux.intel.com> Date: Sun, 10 Oct 2021 19:39:55 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0 Subject: Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared Content-Language: en-US To: "Michael S. Tsirkin" , Kuppuswamy Sathyanarayanan Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Peter Zijlstra , Andy Lutomirski , Bjorn Helgaas , Richard Henderson , Thomas Bogendoerfer , James E J Bottomley , Helge Deller , "David S . Miller" , Arnd Bergmann , Jonathan Corbet , Paolo Bonzini , David Hildenbrand , Andrea Arcangeli , Josh Poimboeuf , Peter H Anvin , Dave Hansen , Tony Luck , Dan Williams , Kirill Shutemov , Sean Christopherson , Kuppuswamy Sathyanarayanan , x86@kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-alpha@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, virtualization@lists.linux-foundation.org References: <20211009003711.1390019-1-sathyanarayanan.kuppuswamy@linux.intel.com> <20211009003711.1390019-17-sathyanarayanan.kuppuswamy@linux.intel.com> <20211009070132-mutt-send-email-mst@kernel.org> From: Andi Kleen In-Reply-To: <20211009070132-mutt-send-email-mst@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > The connection is quite unfortunate IMHO. > Can't there be an option > that unbreaks drivers *without* opening up security holes by > making BIOS shared? That would require new low level APIs that distinguish both cases, and a tree sweep. -Andi