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=-5.4 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 4E810C433E0 for ; Fri, 12 Feb 2021 21:49:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 02FE664E26 for ; Fri, 12 Feb 2021 21:49:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230043AbhBLVtW (ORCPT ); Fri, 12 Feb 2021 16:49:22 -0500 Received: from mga05.intel.com ([192.55.52.43]:54330 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229602AbhBLVtS (ORCPT ); Fri, 12 Feb 2021 16:49:18 -0500 IronPort-SDR: s0vfuOhQIact/CLW7TvSOVwR+w5+Wvg7LNxH44ZA54rZ/+R1albZJC7mXAbMEVJ5ogEacTiB4F eUw8hixWsIzg== X-IronPort-AV: E=McAfee;i="6000,8403,9893"; a="267327269" X-IronPort-AV: E=Sophos;i="5.81,174,1610438400"; d="scan'208";a="267327269" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Feb 2021 13:48:37 -0800 IronPort-SDR: 4Nx/rNR5LH+p6FS7idLfnkzW0vLPSPF/Y7Du08nZnqIDqtg6olBVl7aG9i8yilq3DmCY/EmIrz wRAwLm1d2S0g== X-IronPort-AV: E=Sophos;i="5.81,174,1610438400"; d="scan'208";a="364231676" Received: from nmustaf1-mobl.amr.corp.intel.com (HELO [10.212.81.109]) ([10.212.81.109]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Feb 2021 13:48:37 -0800 Subject: Re: [RFC v1 05/26] x86/traps: Add #VE support for TDX guest To: Andy Lutomirski , Sean Christopherson Cc: Kuppuswamy Sathyanarayanan , Peter Zijlstra , Andi Kleen , Kirill Shutemov , Kuppuswamy Sathyanarayanan , Dan Williams , Raj Ashok , LKML , Sean Christopherson References: <48a702f536ccf953eee5778023ed6d1a452f6dcf.1612563142.git.sathyanarayanan.kuppuswamy@linux.intel.com> <8c23bbfd-e371-a7cf-7f77-ec744181547b@intel.com> <514734d9-d8be-03ee-417e-4d0ad2f56276@intel.com> <7d0b08c4-5ae7-f914-e217-767a9fae7b78@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: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2/12/21 1:47 PM, Andy Lutomirski wrote: >> What about adding a property to the TD, e.g. via a flag set during TD creation, >> that controls whether unaccepted accesses cause #VE or are, for all intents and >> purposes, fatal? That would allow Linux to pursue treating EPT #VEs for private >> GPAs as fatal, but would give us a safety and not prevent others from utilizing >> #VEs. > That seems reasonable. Ditto. We first need to double check to see if the docs are right, though.