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[91.12.98.205]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-39efa4330bfsm15769041f8f.23.2025.04.22.09.49.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 22 Apr 2025 09:49:16 -0700 (PDT) Message-ID: <1bee5078-5cc4-43b7-993c-f1e57a9bf534@redhat.com> Date: Tue, 22 Apr 2025 18:49:14 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC v7 3/8] security: Export security_inode_init_security_anon for KVM guest_memfd To: Shivank Garg , Paul Moore Cc: seanjc@google.com, vbabka@suse.cz, willy@infradead.org, akpm@linux-foundation.org, shuah@kernel.org, pbonzini@redhat.com, ackerleytng@google.com, jmorris@namei.org, serge@hallyn.com, pvorel@suse.cz, bfoster@redhat.com, tabba@google.com, vannapurve@google.com, chao.gao@intel.com, bharata@amd.com, nikunj@amd.com, michael.day@amd.com, yan.y.zhao@intel.com, Neeraj.Upadhyay@amd.com, thomas.lendacky@amd.com, michael.roth@amd.com, aik@amd.com, jgg@nvidia.com, kalyazin@amazon.com, peterx@redhat.com, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-coco@lists.linux.dev References: <20250408112402.181574-1-shivankg@amd.com> <20250408112402.181574-4-shivankg@amd.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 95A92180008 X-Stat-Signature: osytcjzfu7xy7qqcph6gc5p9yqw3c34r X-Rspam-User: X-HE-Tag: 1745340560-458851 X-HE-Meta: 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 2022lLIi 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 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: List-Subscribe: List-Unsubscribe: On 11.04.25 08:07, Shivank Garg wrote: > Hi Paul, > > On 4/10/2025 1:49 AM, Paul Moore wrote: >> On Tue, Apr 8, 2025 at 7:25 AM Shivank Garg wrote: >>> >>> KVM guest_memfd is implementing its own inodes to store metadata for >>> backing memory using a custom filesystem. This requires the ability to >>> initialize anonymous inode using security_inode_init_security_anon(). >>> >>> As guest_memfd currently resides in the KVM module, we need to export this >>> symbol for use outside the core kernel. In the future, guest_memfd might be >>> moved to core-mm, at which point the symbols no longer would have to be >>> exported. When/if that happens is still unclear. >> >> Can you help me understand the timing just a bit more ... do you >> expect the move to the core MM code to happen during the lifetime of >> this patchset, or is it just some hand-wavy "future date"? No worries >> either way, just trying to understand things a bit better. > > I am not sure about it, any ideas David? Sorry for the late reply. Hand-wavy future date after this series. Elliot was working on this, but IIRC he now has a new job and might no longer be able to work on this. Ackerley+Patrick started looking into this, and will likely require it for other guest_memfd features (hugetlb support, directmap removal). -- Cheers, David / dhildenb