From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 524363FC5 for ; Wed, 15 Sep 2021 15:35:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1631720145; 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=hLB4RIdMUuayuQDxk1drvnDwcRCYgf6RZ3NglDIohcw=; b=T0D9J7QxrQt7dA278sa3XHmvg9thuMJTlSPWlHQqIeuGX68+nwyv6V0IbgMCwQ91BF/Z88 GE4NDs7jKq87VaTRjZmQCNLraGnYNnjb12tCrcgaTln6+jiijpTDZ0pv78a/Eh+4Ihv2Mr imn+3BQQogpXBi18GetOqLPYZh7sFQM= Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-126-PV9NclIKPku-HZ5ePbWLBA-1; Wed, 15 Sep 2021 11:35:44 -0400 X-MC-Unique: PV9NclIKPku-HZ5ePbWLBA-1 Received: by mail-wm1-f70.google.com with SMTP id z18-20020a1c7e120000b02902e69f6fa2e0so1637846wmc.9 for ; Wed, 15 Sep 2021 08:35:43 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:subject:from:to:cc:references:organization :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=hLB4RIdMUuayuQDxk1drvnDwcRCYgf6RZ3NglDIohcw=; b=1q/LHDx2U2lFwJAhhiRRW1G3+YLKIL6BqLBDy36AXZCDNvK5RNSjA8LVxBwlD9Ccji B/Z1++EhJaUIVTwjJMBt+SzCsXP2vrkCtR6EXvwpRyAqUfR65dXraJyVNZxteZ5opbEq 27KlKmLzk2QAI7RpgzgpjTpyzGHL/1BTHGXV4LilfITJu+JxoaD5weuyYY0KVGMuzlWM AhkWtvQgfJ/1/cW1wLBKPRdcZy3DrhqUD6N0JGUxWLdg9mKo0cx7GU2gDHcqxoZZRuyK vM1oSKTy2iSbrZJfcOexTdWP5krRqO9DUSDr7Mam+HayQoWtPDTgNrQsi36rBD0F2TAL kdBQ== X-Gm-Message-State: AOAM533+ZAiCP9m7X2c+Lr0a/eTCKzy2Gzngd7Us1c00lmHwQlTd8Ap2 jUJazfYlvIE02flVYZtwe0ryIQ3ky9fwSDnkFLcBJQ7IYzN5rBTS+MRmN6KSHGTf+b6JLwTzVLK 9VMEutVP0bfQCc6RZr4XZPA== X-Received: by 2002:a5d:66d1:: with SMTP id k17mr681531wrw.200.1631720142823; Wed, 15 Sep 2021 08:35:42 -0700 (PDT) X-Google-Smtp-Source: ABdhPJw5OWqaCDbnfPfYJivbWZX/tz0dw8poxVVs/OqIyOZE0YLU2lOPz/RKZDjKDqWUdl51wuaSBw== X-Received: by 2002:a5d:66d1:: with SMTP id k17mr681496wrw.200.1631720142598; Wed, 15 Sep 2021 08:35:42 -0700 (PDT) Received: from [192.168.3.132] (p5b0c6426.dip0.t-ipconnect.de. [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 Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: 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 >> >>> 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