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Mon, 21 Jul 2025 11:44:42 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id nelPGyoofmjUMgAAD6G6ig (envelope-from ); Mon, 21 Jul 2025 11:44:42 +0000 Message-ID: <78f3032d-dfa4-4907-be42-6a7e8a34371e@suse.cz> Date: Mon, 21 Jul 2025 13:44:42 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH V9 5/7] KVM: guest_memfd: Add slab-allocated inode cache Content-Language: en-US To: Shivank Garg , seanjc@google.com, david@redhat.com, willy@infradead.org, akpm@linux-foundation.org, shuah@kernel.org, pbonzini@redhat.com, brauner@kernel.org, viro@zeniv.linux.org.uk Cc: ackerleytng@google.com, paul@paul-moore.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, 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, rppt@kernel.org, hch@infradead.org, cgzones@googlemail.com, ira.weiny@intel.com, rientjes@google.com, roypat@amazon.co.uk, ziy@nvidia.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, gourry@gourry.net, kent.overstreet@linux.dev, ying.huang@linux.alibaba.com, apopple@nvidia.com, 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, aneeshkumar.kizhakeveetil@arm.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: <20250713174339.13981-2-shivankg@amd.com> <20250713174339.13981-8-shivankg@amd.com> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Rspamd-Queue-Id: 039EA18000A X-Stat-Signature: i8ufuzxuwzygrjdqqatwrtpigrn9zc4p X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1753098284-210252 X-HE-Meta: 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 tEj4yh/u 8B4eYqkvbidrEjjCY442CTEo8iR64ER2Ezlcje9Cu5r4SRl3nIaRCEnLvdmoMNYxXVZheSEmTNRHBIzfjr35y1XbKNFNFYpOVJy2iEdqZC5dCQTO6IkduBk0i+JRueMPU+VSGKeCojOCg3zNmqatrgeqrz+ABB+tFkbLo7eIqhHBMNPDF22oooZonIxGstrdCsIUSRvYtg6ZqJRSgVMtaPzLG5R6wfbSr56yxoec2UzzT8x+nwMhPNIUCXuUXRAWBb1bCx4N+BTJ1o3c+RG+0nsjMa+W7DKplOpG806a04olK13bAxYTNfw9Q6BsP0IzUTe/g/VXRsA5KsOYMmEOh4yFSCGS+8/Vjq+f+o7dGSkdbEly99CMtvQTxBYvo6ZdxDUPGJB8IjICYP50= 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 7/13/25 19:43, Shivank Garg wrote: > Add dedicated inode structure (kvm_gmem_inode_info) and slab-allocated > inode cache for guest memory backing, similar to how shmem handles inodes. > > This adds the necessary allocation/destruction functions and prepares > for upcoming guest_memfd NUMA policy support changes. > > Signed-off-by: Shivank Garg > --- > virt/kvm/guest_memfd.c | 58 ++++++++++++++++++++++++++++++++++++++++-- > 1 file changed, 56 insertions(+), 2 deletions(-) > > diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c > index dabcc2317291..989e2b26b344 100644 > --- a/virt/kvm/guest_memfd.c > +++ b/virt/kvm/guest_memfd.c > @@ -17,6 +17,15 @@ struct kvm_gmem { > struct list_head entry; > }; > > +struct kvm_gmem_inode_info { > + struct inode vfs_inode; > +}; > + > +static inline struct kvm_gmem_inode_info *KVM_GMEM_I(struct inode *inode) > +{ > + return container_of(inode, struct kvm_gmem_inode_info, vfs_inode); > +} > + > /** > * folio_file_pfn - like folio_file_page, but return a pfn. > * @folio: The folio which contains this index. > @@ -392,8 +401,33 @@ static struct file_operations kvm_gmem_fops = { > .fallocate = kvm_gmem_fallocate, > }; > > +static struct kmem_cache *kvm_gmem_inode_cachep; > + > +static struct inode *kvm_gmem_alloc_inode(struct super_block *sb) > +{ > + struct kvm_gmem_inode_info *info; > + > + info = alloc_inode_sb(sb, kvm_gmem_inode_cachep, GFP_KERNEL); > + if (!info) > + return NULL; > + > + return &info->vfs_inode; > +} > + > +static void kvm_gmem_destroy_inode(struct inode *inode) > +{ > +} > + > +static void kvm_gmem_free_inode(struct inode *inode) > +{ > + kmem_cache_free(kvm_gmem_inode_cachep, KVM_GMEM_I(inode)); > +} > + > static const struct super_operations kvm_gmem_super_operations = { > .statfs = simple_statfs, > + .alloc_inode = kvm_gmem_alloc_inode, > + .destroy_inode = kvm_gmem_destroy_inode, > + .free_inode = kvm_gmem_free_inode, > }; > > static int kvm_gmem_init_fs_context(struct fs_context *fc) > @@ -426,17 +460,37 @@ static int kvm_gmem_init_mount(void) > return 0; > } > > +static void kvm_gmem_init_inode(void *foo) > +{ > + struct kvm_gmem_inode_info *info = foo; > + > + inode_init_once(&info->vfs_inode); > +} > + > int kvm_gmem_init(struct module *module) > { > - kvm_gmem_fops.owner = module; > + int ret; > > - return kvm_gmem_init_mount(); > + kvm_gmem_fops.owner = module; > + kvm_gmem_inode_cachep = kmem_cache_create("kvm_gmem_inode_cache", > + sizeof(struct kvm_gmem_inode_info), > + 0, SLAB_ACCOUNT, > + kvm_gmem_init_inode); Since this is new code, please use the new variant of kmem_cache_create() that takes the args parameter. > + if (!kvm_gmem_inode_cachep) > + return -ENOMEM; > + ret = kvm_gmem_init_mount(); > + if (ret) { > + kmem_cache_destroy(kvm_gmem_inode_cachep); > + return ret; > + } > + return 0; > } > > void kvm_gmem_exit(void) > { > kern_unmount(kvm_gmem_mnt); > kvm_gmem_mnt = NULL; > + kmem_cache_destroy(kvm_gmem_inode_cachep); > } > > static int kvm_gmem_migrate_folio(struct address_space *mapping,