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=-6.2 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 2B8A8C432BE for ; Tue, 31 Aug 2021 20:02:11 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id BBCD0600CC for ; Tue, 31 Aug 2021 20:02:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org BBCD0600CC Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id F12176B006C; Tue, 31 Aug 2021 16:02:09 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id EC0E06B0071; Tue, 31 Aug 2021 16:02:09 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id DD7686B0072; Tue, 31 Aug 2021 16:02:09 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0110.hostedemail.com [216.40.44.110]) by kanga.kvack.org (Postfix) with ESMTP id CFDBF6B006C for ; Tue, 31 Aug 2021 16:02:09 -0400 (EDT) Received: from smtpin19.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 60204274B7 for ; Tue, 31 Aug 2021 20:02:09 +0000 (UTC) X-FDA: 78536447178.19.4926694 Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by imf16.hostedemail.com (Postfix) with ESMTP id 33EA5F000091 for ; Tue, 31 Aug 2021 20:02:08 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10093"; a="218277862" X-IronPort-AV: E=Sophos;i="5.84,367,1620716400"; d="scan'208";a="218277862" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Aug 2021 13:01:42 -0700 X-IronPort-AV: E=Sophos;i="5.84,367,1620716400"; d="scan'208";a="687857794" Received: from akleen-mobl1.amr.corp.intel.com (HELO [10.209.121.250]) ([10.209.121.250]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Aug 2021 13:01:39 -0700 Subject: Re: [RFC] KVM: mm: fd-based approach for supporting KVM guest private memory To: David Hildenbrand , Yu Zhang Cc: Sean Christopherson , Paolo Bonzini , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Borislav Petkov , Andy Lutomirski , Andrew Morton , Joerg Roedel , David Rientjes , Vlastimil Babka , Tom Lendacky , Thomas Gleixner , Peter Zijlstra , Ingo Molnar , Varad Gautam , Dario Faggioli , x86@kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev, "Kirill A . Shutemov" , "Kirill A . Shutemov" , Kuppuswamy Sathyanarayanan , Dave Hansen References: <20210824005248.200037-1-seanjc@google.com> <307d385a-a263-276f-28eb-4bc8dd287e32@redhat.com> <20210827023150.jotwvom7mlsawjh4@linux.intel.com> <243bc6a3-b43b-cd18-9cbb-1f42a5de802f@redhat.com> From: Andi Kleen Message-ID: <765e9bbe-2df5-3dcc-9329-347770dc091d@linux.intel.com> Date: Tue, 31 Aug 2021 13:01:37 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: <243bc6a3-b43b-cd18-9cbb-1f42a5de802f@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Authentication-Results: imf16.hostedemail.com; dkim=none; dmarc=fail reason="No valid SPF, No valid DKIM" header.from=intel.com (policy=none); spf=none (imf16.hostedemail.com: domain of ak@linux.intel.com has no SPF policy when checking 192.55.52.115) smtp.mailfrom=ak@linux.intel.com X-Stat-Signature: aaeduwh4pfs3msgccf7ik9w45h5rops5 X-Rspamd-Queue-Id: 33EA5F000091 X-Rspamd-Server: rspam04 X-HE-Tag: 1630440127-981332 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: >> Thanks a lot for this summary. A question about the requirement: do >> we or >> do we not have plan to support assigned device to the protected VM? > > Good question, I assume that is stuff for the far far future. It is in principle possible with the current TDX, but not secure. But someone might decide to do it. So it would be good to have basic support at least. -Andi > >