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 F1D32C432BE for ; Tue, 31 Aug 2021 20:39:40 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 76B9061057 for ; Tue, 31 Aug 2021 20:39:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 76B9061057 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 B3E726B0073; Tue, 31 Aug 2021 16:39:39 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id AEE256B0074; Tue, 31 Aug 2021 16:39:39 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9DCC46B0075; Tue, 31 Aug 2021 16:39:39 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0251.hostedemail.com [216.40.44.251]) by kanga.kvack.org (Postfix) with ESMTP id 8CD2D6B0073 for ; Tue, 31 Aug 2021 16:39:39 -0400 (EDT) Received: from smtpin06.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 391FD1801E209 for ; Tue, 31 Aug 2021 20:39:39 +0000 (UTC) X-FDA: 78536541678.06.04F1ED9 Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by imf26.hostedemail.com (Postfix) with ESMTP id 79A9A20019D3 for ; Tue, 31 Aug 2021 20:39:38 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10093"; a="218574890" X-IronPort-AV: E=Sophos;i="5.84,367,1620716400"; d="scan'208";a="218574890" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Aug 2021 13:39:36 -0700 X-IronPort-AV: E=Sophos;i="5.84,367,1620716400"; d="scan'208";a="687867566" 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 13:39:33 -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> <765e9bbe-2df5-3dcc-9329-347770dc091d@linux.intel.com> <4677f310-5987-0c13-5caf-fd3b625b4344@redhat.com> From: Andi Kleen Message-ID: Date: Tue, 31 Aug 2021 13:39:31 -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: <4677f310-5987-0c13-5caf-fd3b625b4344@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Authentication-Results: imf26.hostedemail.com; dkim=none; spf=none (imf26.hostedemail.com: domain of ak@linux.intel.com has no SPF policy when checking 134.134.136.24) smtp.mailfrom=ak@linux.intel.com; dmarc=fail reason="No valid SPF, No valid DKIM" header.from=intel.com (policy=none) X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 79A9A20019D3 X-Stat-Signature: nxkadn69s1wdhtx8jqybt78thb3digsj X-HE-Tag: 1630442378-3353 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: On 8/31/2021 1:15 PM, David Hildenbrand wrote: > On 31.08.21 22:01, Andi Kleen wrote: >> >>>> 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. > > Can you elaborate the "not secure" part? Do you mean, making the > device only access "shared" memory, not secure/encrypted/whatsoever? Yes that's right. It can only access shared areas. -Andi