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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Aug 2025 17:57:11.5234 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: df7a1307-3632-461b-0cd8-08dde59325fa X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF000023CD.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB8233 Content-Type: text/plain; charset="utf-8" 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 | 70 ++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 68 insertions(+), 2 deletions(-) diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c index 6c66a0974055..356947d36a47 100644 --- a/virt/kvm/guest_memfd.c +++ b/virt/kvm/guest_memfd.c @@ -17,6 +17,15 @@ struct kvm_gmem { struct list_head entry; }; =20 +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. @@ -389,13 +398,46 @@ static struct file_operations kvm_gmem_fops =3D { .fallocate =3D kvm_gmem_fallocate, }; =20 +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 =3D 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 =3D { + .statfs =3D simple_statfs, + .alloc_inode =3D kvm_gmem_alloc_inode, + .destroy_inode =3D kvm_gmem_destroy_inode, + .free_inode =3D kvm_gmem_free_inode, +}; + static int kvm_gmem_init_fs_context(struct fs_context *fc) { + struct pseudo_fs_context *ctx; + if (!init_pseudo(fc, GUEST_MEMFD_MAGIC)) return -ENOMEM; =20 fc->s_iflags |=3D SB_I_NOEXEC; fc->s_iflags |=3D SB_I_NODEV; + ctx =3D fc->fs_private; + ctx->ops =3D &kvm_gmem_super_operations; =20 return 0; } @@ -417,17 +459,41 @@ static int kvm_gmem_init_mount(void) return 0; } =20 +static void kvm_gmem_init_inode(void *foo) +{ + struct kvm_gmem_inode_info *info =3D foo; + + inode_init_once(&info->vfs_inode); +} + int kvm_gmem_init(struct module *module) { - kvm_gmem_fops.owner =3D module; + int ret; + struct kmem_cache_args args =3D { + .align =3D 0, + .ctor =3D kvm_gmem_init_inode, + }; =20 - return kvm_gmem_init_mount(); + kvm_gmem_fops.owner =3D module; + kvm_gmem_inode_cachep =3D kmem_cache_create("kvm_gmem_inode_cache", + sizeof(struct kvm_gmem_inode_info), + &args, SLAB_ACCOUNT); + if (!kvm_gmem_inode_cachep) + return -ENOMEM; + ret =3D kvm_gmem_init_mount(); + if (ret) { + kmem_cache_destroy(kvm_gmem_inode_cachep); + return ret; + } + return 0; } =20 void kvm_gmem_exit(void) { kern_unmount(kvm_gmem_mnt); kvm_gmem_mnt =3D NULL; + rcu_barrier(); + kmem_cache_destroy(kvm_gmem_inode_cachep); } =20 static int kvm_gmem_migrate_folio(struct address_space *mapping, --=20 2.43.0