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[2003:d8:2f28:c100:2225:10aa:f247:7b85]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3c70e4b9f8dsm26199961f8f.9.2025.08.28.03.06.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 28 Aug 2025 03:06:15 -0700 (PDT) Message-ID: <4db9239a-efe3-43b2-b7b4-af497eb9ee28@redhat.com> Date: Thu, 28 Aug 2025 12:06:12 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH kvm-next V11 4/7] KVM: guest_memfd: Use guest mem inodes instead of anonymous inodes To: Ackerley Tng , Shivank Garg , willy@infradead.org, akpm@linux-foundation.org, pbonzini@redhat.com, shuah@kernel.org, seanjc@google.com, vbabka@suse.cz Cc: brauner@kernel.org, viro@zeniv.linux.org.uk, dsterba@suse.com, xiang@kernel.org, chao@kernel.org, jaegeuk@kernel.org, clm@fb.com, josef@toxicpanda.com, kent.overstreet@linux.dev, zbestahu@gmail.com, jefflexu@linux.alibaba.com, dhavale@google.com, lihongbo22@huawei.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, rppt@kernel.org, surenb@google.com, mhocko@suse.com, ziy@nvidia.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, gourry@gourry.net, ying.huang@linux.alibaba.com, apopple@nvidia.com, tabba@google.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, pvorel@suse.cz, bfoster@redhat.com, vannapurve@google.com, chao.gao@intel.com, bharata@amd.com, nikunj@amd.com, michael.day@amd.com, shdhiman@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, jack@suse.cz, hch@infradead.org, cgzones@googlemail.com, ira.weiny@intel.com, rientjes@google.com, roypat@amazon.co.uk, chao.p.peng@intel.com, amit@infradead.org, ddutile@redhat.com, dan.j.williams@intel.com, ashish.kalra@amd.com, gshan@redhat.com, jgowans@amazon.com, pankaj.gupta@amd.com, papaluri@amd.com, yuzhao@google.com, suzuki.poulose@arm.com, quic_eberman@quicinc.com, linux-bcachefs@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-f2fs-devel@lists.sourceforge.net, 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: <20250827175247.83322-2-shivankg@amd.com> <20250827175247.83322-7-shivankg@amd.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 25C871A0009 X-Stat-Signature: x16z8jazw9mp9zu9ocyef8ig8s4ojgoc X-HE-Tag: 1756375580-314713 X-HE-Meta: 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 FsKQl7ti 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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 28.08.25 00:43, Ackerley Tng wrote: > Shivank Garg writes: > >> >> [...snip...] >> > > I meant to send this to you before this version went out but you were > too quick! > > Here's a new version, Fuad and I reviewed this again internally. The > changes are: > > + Sort linux/pseudo_fs.h after linux/pagemap.h (alphabetical) > + Don't set MNT_NOEXEC on the mount, since SB_I_NOEXEC was already set > on the superblock > + Rename kvm_gmem_inode_make_secure_inode() to kvm_gmem_inode_create() > + Emphasizes that there is a creation in this function > + Remove "secure" from the function name to remove confusion that > there may be a "non-secure" version > + In kvm_gmem_inode_create_getfile()'s error path, return ERR_PTR(err) > directly instead of having a goto > > > From ada9814b216eac129ed44dffd3acf76fce2cc08a Mon Sep 17 00:00:00 2001 > From: Ackerley Tng > Date: Sun, 13 Jul 2025 17:43:35 +0000 > Subject: [PATCH] KVM: guest_memfd: Use guest mem inodes instead of anonymous > inodes > > guest_memfd's inode represents memory the guest_memfd is > providing. guest_memfd's file represents a struct kvm's view of that > memory. > > Using a custom inode allows customization of the inode teardown > process via callbacks. For example, ->evict_inode() allows > customization of the truncation process on file close, and > ->destroy_inode() and ->free_inode() allow customization of the inode > freeing process. > > Customizing the truncation process allows flexibility in management of > guest_memfd memory and customization of the inode freeing process > allows proper cleanup of memory metadata stored on the inode. > > Memory metadata is more appropriately stored on the inode (as opposed > to the file), since the metadata is for the memory and is not unique > to a specific binding and struct kvm. > > Co-developed-by: Fuad Tabba > Signed-off-by: Fuad Tabba > Signed-off-by: Shivank Garg > Signed-off-by: Ackerley Tng Acked-by: David Hildenbrand -- Cheers David / dhildenb