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[79.242.59.245]) by smtp.gmail.com with ESMTPSA id p11sm3438168wma.16.2021.08.31.13.15.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 31 Aug 2021 13:15:41 -0700 (PDT) Subject: Re: [RFC] KVM: mm: fd-based approach for supporting KVM guest private memory To: Andi Kleen , 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> From: David Hildenbrand Organization: Red Hat Message-ID: <4677f310-5987-0c13-5caf-fd3b625b4344@redhat.com> Date: Tue, 31 Aug 2021 22:15:40 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: <765e9bbe-2df5-3dcc-9329-347770dc091d@linux.intel.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=david@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit 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? -- Thanks, David / dhildenb 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=-8.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable 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 6D231C4320A for ; Tue, 31 Aug 2021 20:15:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 53AE261057 for ; Tue, 31 Aug 2021 20:15:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240896AbhHaUQm (ORCPT ); Tue, 31 Aug 2021 16:16:42 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:60660 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232698AbhHaUQk (ORCPT ); Tue, 31 Aug 2021 16:16:40 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1630440944; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=g+3bK63F6vZV9gF02enJmq1IwAzxVldbfTOh+NENPz4=; b=XAIS078aFLvwDF9G6Pq+DoRdW806EK+1YyqapSPR4RbRQ4m5M4eHx8Doq6/Dpvjp96kZZd rwbCWoxbypHEe3ztVIAe9A1k+F0rW+bEHbr3ytQuLl6MBvcvCAIeoZ9I2QH0Tapog+B8lI 1Xr3PYyIkvZ8WczI8fEMdqpwp1DJrD4= Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-398-R9veAn6BOSWLziU-fu_Hpg-1; Tue, 31 Aug 2021 16:15:43 -0400 X-MC-Unique: R9veAn6BOSWLziU-fu_Hpg-1 Received: by mail-wm1-f72.google.com with SMTP id m16-20020a7bca50000000b002ee5287d4bfso120469wml.7 for ; Tue, 31 Aug 2021 13:15:43 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:organization :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=g+3bK63F6vZV9gF02enJmq1IwAzxVldbfTOh+NENPz4=; b=Ib/Q7sy2HoscIKcrIJtVDjGTDD+eICPBTxQtbJCCG9QeDeOP0kUpDs6MYfvS23CHf1 bRAB58RHM7NDvXl+8ITyXNumdXLdj6GvFG4nMhxyh2pD58a8LXnO7hh+H8H7LDmPRuOn +J7/L8vCwxLqnfVf1vdQNvsQbU+beFqxQQsaYvc8fSDlXaBxGcgsrXNjPdY4ZjpfVUuH BNbUoQexoGzxMgzuolmVRcjLqS+jjNGJML0FQ8YbKbz0GpoGd2z7NlqftXlP3mQOC39k 19BvKfNdlA92wpFrbcgEY+TYa/Ej/JPcfyU6yBiaRol8PnJiAlFP2OFUpKmbk3VjDul3 /H+g== X-Gm-Message-State: AOAM532r1eg1/iVfXQnbsErNJ8rHS/se717z/zDJ1uzD9xpKz9Q073Oq 5ZfJl9OdcZ6Sb6y+x8FA9nXOLEZm9O8MZrYWeBLBSsvKMFtD1lUyYoGR3Y5jgjwW5yZlGLNa8On WKadyc8zbUpTE5pcaPDjB3YvL X-Received: by 2002:a1c:7c0e:: with SMTP id x14mr6178332wmc.30.1630440942385; Tue, 31 Aug 2021 13:15:42 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyB2RQAmO5BS/DvOxJgqehQUn6XNwZTVP2aL40tssuajSfi8Q5/tHrZmF44xOFZj1btCjBABg== X-Received: by 2002:a1c:7c0e:: with SMTP id x14mr6178303wmc.30.1630440942231; Tue, 31 Aug 2021 13:15:42 -0700 (PDT) Received: from [192.168.3.132] (p4ff23bf5.dip0.t-ipconnect.de. [79.242.59.245]) by smtp.gmail.com with ESMTPSA id p11sm3438168wma.16.2021.08.31.13.15.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 31 Aug 2021 13:15:41 -0700 (PDT) Subject: Re: [RFC] KVM: mm: fd-based approach for supporting KVM guest private memory To: Andi Kleen , 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> From: David Hildenbrand Organization: Red Hat Message-ID: <4677f310-5987-0c13-5caf-fd3b625b4344@redhat.com> Date: Tue, 31 Aug 2021 22:15:40 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <765e9bbe-2df5-3dcc-9329-347770dc091d@linux.intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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? -- Thanks, David / dhildenb