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[91.12.100.38]) by smtp.gmail.com with ESMTPSA id h8sm4462077wmb.35.2021.09.15.08.35.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 15 Sep 2021 08:35:41 -0700 (PDT) Subject: Re: [RFC] KVM: mm: fd-based approach for supporting KVM guest private memory From: David Hildenbrand To: "Kirill A. Shutemov" Cc: Chao Peng , "Kirill A. Shutemov" , Andy Lutomirski , Sean Christopherson , Paolo Bonzini , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Borislav Petkov , Andrew Morton , Joerg Roedel , Andi Kleen , 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, Kuppuswamy Sathyanarayanan , Dave Hansen , Yu Zhang References: <20210824005248.200037-1-seanjc@google.com> <20210902184711.7v65p5lwhpr2pvk7@box.shutemov.name> <20210903191414.g7tfzsbzc7tpkx37@box.shutemov.name> <02806f62-8820-d5f9-779c-15c0e9cd0e85@kernel.org> <20210910171811.xl3lms6xoj3kx223@box.shutemov.name> <20210915195857.GA52522@chaop.bj.intel.com> <51a6f74f-6c05-74b9-3fd7-b7cd900fb8cc@redhat.com> <20210915142921.bxxsap6xktkt4bek@black.fi.intel.com> Organization: Red Hat Message-ID: <09caba0b-6b3d-668f-312c-ed870379b669@redhat.com> Date: Wed, 15 Sep 2021 17:35:40 +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: 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: imf01.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=T0D9J7Qx; spf=none (imf01.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-Stat-Signature: ez1jh9kg445dtkh4qnyiw1px3z1hmhnm X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: F20A4505B03E X-HE-Tag: 1631720145-231604 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: >> >>> who will actually do some kind of gfn-epfn etc. mapping, how we'll >>> forbid access to this memory e.g., via /proc/kcore or when dumping memory >> >> It's not aimed to prevent root to shoot into his leg. Root do root. > > IMHO being root is not an excuse to read some random file (actually used > in production environments) to result in the machine crashing. Not > acceptable for distributions. I just realized that reading encrypted memory should be ok and only writing is an issue, right? -- Thanks, David / dhildenb