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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 MIME-Version: 1.0 In-Reply-To: <765e9bbe-2df5-3dcc-9329-347770dc091d@linux.intel.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 Authentication-Results: imf28.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=M6dtU0ea; spf=none (imf28.hostedemail.com: domain of david@redhat.com has no SPF policy when checking 216.205.24.124) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 77BFB90000A3 X-Stat-Signature: 39bn4qg5pfxigushx9jwedrf1h1q7xss X-HE-Tag: 1630440947-322505 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 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