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[23.128.96.18]) by mx.google.com with ESMTP id w1si336342ejq.335.2021.05.19.11.19.44; Wed, 19 May 2021 11:20:08 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343845AbhERPNb (ORCPT + 99 others); Tue, 18 May 2021 11:13:31 -0400 Received: from mga18.intel.com ([134.134.136.126]:5096 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350106AbhERPNH (ORCPT ); Tue, 18 May 2021 11:13:07 -0400 IronPort-SDR: WLjSkG9zf3refgBkr5XbeKeF4gOWRuCIgUxWd3PL0u54rY7/DaanixKAFCxHkFEBbMRQ8PjtZM ZPTaL+vULCwQ== X-IronPort-AV: E=McAfee;i="6200,9189,9988"; a="188145772" X-IronPort-AV: E=Sophos;i="5.82,310,1613462400"; d="scan'208";a="188145772" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 May 2021 08:11:47 -0700 IronPort-SDR: aIqzug+W2qHQCWc6eJ5PxsUHoCxArlTW0EKyVN1+Dum6mH0qtzcaAC4BKcKqtHHYIB1icyVGkh U+69WlMDa7jw== X-IronPort-AV: E=Sophos;i="5.82,310,1613462400"; d="scan'208";a="542007113" Received: from craigsmi-mobl.amr.corp.intel.com (HELO [10.212.132.228]) ([10.212.132.228]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 May 2021 08:11:46 -0700 Subject: Re: [RFC v2-fix 1/1] x86/traps: Add #VE support for TDX guest To: Kuppuswamy Sathyanarayanan , Peter Zijlstra , Andy Lutomirski Cc: Tony Luck , Andi Kleen , Kirill Shutemov , Kuppuswamy Sathyanarayanan , Dan Williams , Raj Ashok , Sean Christopherson , linux-kernel@vger.kernel.org, Sean Christopherson References: <20210518000957.257869-1-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: <20210518000957.257869-1-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 On 5/17/21 5:09 PM, Kuppuswamy Sathyanarayanan wrote: > After TDGETVEINFO #VE could happen in theory (e.g. through an NMI), > although we don't expect it to happen because we don't expect NMIs to > trigger #VEs. Another case where they could happen is if the #VE > exception panics, but in this case there are no guarantees on anything > anyways. This implies: "we do not expect any NMI to do MMIO". Is that true? Why?