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([2001:b07:6468:f312:9af8:e5f5:7516:fa89]) by smtp.googlemail.com with ESMTPSA id l9-20020aa7c309000000b0051d87e72159sm2346640edq.13.2023.07.21.10.17.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 21 Jul 2023 10:17:40 -0700 (PDT) Message-ID: <8ad7a846-64e9-a3f1-4bf1-731a994d62cb@redhat.com> Date: Fri, 21 Jul 2023 19:17:37 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 To: Sean Christopherson , Marc Zyngier , Oliver Upton , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , "Matthew Wilcox (Oracle)" , Andrew Morton , Paul Moore , James Morris , "Serge E. Hallyn" Cc: kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, Chao Peng , Fuad Tabba , Jarkko Sakkinen , Yu Zhang , Vishal Annapurve , Ackerley Tng , Maciej Szmigiero , Vlastimil Babka , David Hildenbrand , Quentin Perret , Michael Roth , Wang , Liam Merwick , Isaku Yamahata , "Kirill A . Shutemov" References: <20230718234512.1690985-1-seanjc@google.com> <20230718234512.1690985-13-seanjc@google.com> From: Paolo Bonzini Subject: Re: [RFC PATCH v11 12/29] KVM: Add KVM_CREATE_GUEST_MEMFD ioctl() for guest-specific backing memory In-Reply-To: <20230718234512.1690985-13-seanjc@google.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: xogefs9pp97nm8icsatxkyajsbkmks6c X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 10ADD40002 X-Rspam-User: X-HE-Tag: 1689959865-553544 X-HE-Meta: U2FsdGVkX1/cfeWYmH8AjAiakQ1bl9ODvvoTa4kfu5cHQPASFqKpVENWU2zBRJtgP7TgItmtPTijME1Aw0n4NmNHXZ71frLrbWAVTwkDvTAMLwHU2hAtPhPjXLvOn3V8ox9lz4FP4H+3XNG3dF8ezd8bk0/K3Cdj5/RGBF/EsKjfrUni2k2r/X1hw5GqysyCcBygzuWfW0G7/czxrZwb4YOCpj7LMaI1YyIXRg3ubrFUYla2aTxda+bJCARr0Zg4xaSBL6kv/hBK3z0IWzbvJtFI79lGEilsdU5/Z5hObnY78f+ToPL0bkTR8YJiIr/ro1vNwgyFjuV2CCTcaoOVyDfvrPFBHHHcV7HFHUH39bniYXS1KZjR3SxJnXdbMkL0bzPNVqYGTg+Ucx9lMvR9LWgm7Q2JKxWtMhsnq/0l4GFEsVl9yd8bitqLiOM8FZuWFW5fCZ36ST/maiE/hkrJTGyGKeTksKg/eYRu/wYDiENetLFUGpuCmK8Qc0FmLGcX7h3LDmzJuXzJwFZvArBwaUkYZQeN6M6NmXl7h84eRifCSnxyFkoxKh1Ff/RjAWiQ0yyUW0Vrmcy/rQisdHQv6d8TMjGxKP6jIezi5wxUWIvPOf50PKhEzQSsRMJqVSHwXar9v5kf0sEf0TJzozMP2o4ONkEpwYkM7+CB5hpwwNMVNeq7ERYyVtfGIOzYB4H0X7SQYeFbWbzFgsVI47DlohCiCO4wGHj1LpaBzCUXibxbS6bZJ9CV5Obr93sfaWWwwMhK0c2V6NqBP8dVXC3CBjrumX7AJG46AvzNL7aHkV5ZxBCDQXyFOMadccHD0oxokr1oDzs3Rm3dPw28hsj11ysPvacHgCa6RtjLNhvowxWGLTcw99M6HClJXHTZvmEOHSDqPJIObqDJiygVrzrKOf1mvJghVM2RTTMp2QagrjzIwMQBeRr3J9JBWoEHS5MdzBSNPhqnl64zP5Zgh4a RQOgLZHi KSNQW3JAZqXeonWT8hEPfmiNKR3KjEItUvV1wWmago5kYVNSuQVR3TO7UykDfcliQjMSPOqakVKAs4XmfMkgc8x6srGJMELVOcqLKEq0/aOL8oFIE5yV0vlJ0DKcmH83W42oUXPSdX7uWARRQ4tXLioCcW+j/YeNULPHxTy+qT2FFmOI/LWdaeX7MhcYipQNXefnh/g3gTC4S/Uq1nyyiYrZtaRpO/UCkdkDmquluCjwD2HTfO5yQduBb7HccxXQYZcbrMtSY5husmuyw+N34NCdh8l5UiVHL0DSmbgfPXxRG5AuQ2tJeKfMgwioXAGs5rB0Z8JLWGI8iG3/KwjTQYrXxWWK7W0ucNALn+SJN3K+H0wSomALR0yd4WaOIEC6sKK8q3eK9+9AT0Ev8PXgTls8UGaMYpRPQp7qq6DGipSWSvaIIodsmfPaB4RnteZADpQt/ZRyTwpnGbsw2SGVIQfX6G9rgEv6vqheNXAOuj2IUl4o= 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 7/19/23 01:44, Sean Christopherson wrote: > + inode = alloc_anon_inode(mnt->mnt_sb); > + if (IS_ERR(inode)) > + return PTR_ERR(inode); > + > + err = security_inode_init_security_anon(inode, &qname, NULL); > + if (err) > + goto err_inode; > + I don't understand the need to have a separate filesystem. If it is to fully setup the inode before it's given a struct file, why not just export anon_inode_make_secure_inode instead of security_inode_init_security_anon? Paolo