When restoring a snapshot of a VM with persistent-state (TPM/EFI), the newly created PVC being restore from the VolumeSnapshot has spec.requests.storage higher than the original PVC, and also higher than the Restore Size of the VolumeSnapshot.

Some CSI do not like this, and will deny creating the restore PVC from VolumeSnapshot. And will break the restore with something like this:

failed to provision volume with StorageClass "<removed>": rpc error: code = InvalidArgument desc =  runid=6277 Requested size 3408704204 should be same as source snapshot size 3221225472

4.20.0

Always

1. Create a VM with backend storage
2. Snapshot it
3. Restore the snapshot
4. Compare the persistent-state PVC sizes

Keeps increasing on restore

Stays the same

[1] PVC after VM creation:

# oc get pvc persistent-state-for-windows-2022-lg7m9 -o yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  annotations:
    pv.kubernetes.io/bind-completed: "yes"
    pv.kubernetes.io/bound-by-controller: "yes"
    volume.beta.kubernetes.io/storage-provisioner: topolvm.io
    volume.kubernetes.io/selected-node: cyan.shift.home.arpa
    volume.kubernetes.io/storage-provisioner: topolvm.io
  creationTimestamp: "2025-11-11T23:56:26Z"
  finalizers:
  - kubernetes.io/pvc-protection
  generateName: persistent-state-for-windows-2022-
  labels:
    cdi.kubevirt.io/applyStorageProfile: "true"
    persistent-state-for: windows-2022
  name: persistent-state-for-windows-2022-lg7m9
  namespace: homelab
  ownerReferences:
  - apiVersion: kubevirt.io/v1
    blockOwnerDeletion: true
    controller: true
    kind: VirtualMachine
    name: windows-2022
    uid: c8e3f12a-b123-4112-ab81-46451d3ec10a
  resourceVersion: "32220535"
  uid: 21b2c237-615c-4971-8582-cc97303edeec
spec:
  accessModes:
  - ReadWriteOnce
  resources:
    requests:
      storage: "11114906"
  storageClassName: lvms-nvme
  volumeMode: Filesystem
  volumeName: pvc-21b2c237-615c-4971-8582-cc97303edeec
status:
  accessModes:
  - ReadWriteOnce
  capacity:
    storage: 300Mi
  phase: Bound

[2] Create snapshot, check the Restore Size of the VolumeSnapshot, its 300M.

# oc get volumesnapshot vmsnapshot-6100c8ae-87e7-4836-b141-1b71d6767825-volume-persistent-state-for-windows-2022 -o yaml
apiVersion: snapshot.storage.k8s.io/v1
kind: VolumeSnapshot
metadata:
  creationTimestamp: "2025-11-12T00:16:57Z"
  finalizers:
  - snapshot.storage.kubernetes.io/volumesnapshot-as-source-protection
  - snapshot.storage.kubernetes.io/volumesnapshot-bound-protection
  generation: 1
  labels:
    snapshot.kubevirt.io/source-vm-name: windows-2022
    snapshot.kubevirt.io/source-vm-namespace: homelab
  name: vmsnapshot-6100c8ae-87e7-4836-b141-1b71d6767825-volume-persistent-state-for-windows-2022
  namespace: homelab
  ownerReferences:
  - apiVersion: snapshot.kubevirt.io/v1beta1
    blockOwnerDeletion: true
    controller: true
    kind: VirtualMachineSnapshotContent
    name: vmsnapshot-content-6100c8ae-87e7-4836-b141-1b71d6767825
    uid: a476c7c6-1aab-460a-8c31-72ab20183273
  resourceVersion: "32244709"
  uid: 383b0bd7-9411-4dbb-bc98-051618e7aaa9
spec:
  source:
    persistentVolumeClaimName: persistent-state-for-windows-2022-lg7m9
  volumeSnapshotClassName: lvms-nvme
status:
  boundVolumeSnapshotContentName: snapcontent-383b0bd7-9411-4dbb-bc98-051618e7aaa9
  creationTime: "2025-11-12T00:16:57Z"
  readyToUse: true
  restoreSize: 300Mi

Check the original PVC size in the VolumeBackups, matches [1].

# oc get virtualmachinesnapshotcontents vmsnapshot-content-6100c8ae-87e7-4836-b141-1b71d6767825 -o yaml | yq '.spec.volumeBackups[1]'
persistentVolumeClaim:
  metadata:
    annotations:
      pv.kubernetes.io/bind-completed: "yes"
      pv.kubernetes.io/bound-by-controller: "yes"
      volume.beta.kubernetes.io/storage-provisioner: topolvm.io
      volume.kubernetes.io/selected-node: cyan.shift.home.arpa
      volume.kubernetes.io/storage-provisioner: topolvm.io
    creationTimestamp: "2025-11-11T23:56:26Z"
    finalizers:
      - kubernetes.io/pvc-protection
    generateName: persistent-state-for-windows-2022-
    labels:
      cdi.kubevirt.io/applyStorageProfile: "true"
      persistent-state-for: windows-2022
    name: persistent-state-for-windows-2022-lg7m9
    namespace: homelab
    ownerReferences:
      - apiVersion: kubevirt.io/v1
        blockOwnerDeletion: true
        controller: true
        kind: VirtualMachine
        name: windows-2022
        uid: c8e3f12a-b123-4112-ab81-46451d3ec10a
    resourceVersion: "32220535"
    uid: 21b2c237-615c-4971-8582-cc97303edeec
  spec:
    accessModes:
      - ReadWriteOnce
    resources:
      requests:
        storage: "11114906"
    storageClassName: lvms-nvme
    volumeMode: Filesystem
    volumeName: pvc-21b2c237-615c-4971-8582-cc97303edeec
volumeName: persistent-state-for-windows-2022
volumeSnapshotName: vmsnapshot-6100c8ae-87e7-4836-b141-1b71d6767825-volume-persistent-state-for-windows-2022

So it should be 300M, as that is the highest between RestoreSize and the original PVC size as per https://github.com/kubevirt/kubevirt/blob/a88fde37c8adec0390c422002435e1fbdcb7d0c7/pkg/storage/snapshot/restore.go#L1601

But its not, its adding more space:

# oc get pvc restore-25773304-8d59-4e94-b86e-347369d4a46b-persistent-state-for-windows-2022 -o yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  annotations:
    restore.kubevirt.io/lastRestoreUID: restore-windows-2022-snapshot-20251112-101653-1762906813362-25773304-8d59-4e94-b86e-347369d4a46b
    restore.kubevirt.io/name: restore-windows-2022-snapshot-20251112-101653-1762906813362
  creationTimestamp: "2025-11-12T00:21:11Z"
  finalizers:
  - kubernetes.io/pvc-protection
  labels:
    cdi.kubevirt.io/applyStorageProfile: "true"
    persistent-state-for: windows-2022
    restore.kubevirt.io/source-vm-name: windows-2022
    restore.kubevirt.io/source-vm-namespace: homelab
  name: restore-25773304-8d59-4e94-b86e-347369d4a46b-persistent-state-for-windows-2022
  namespace: homelab
  ownerReferences:
  - apiVersion: kubevirt.io/v1
    blockOwnerDeletion: true
    controller: true
    kind: VirtualMachine
    name: windows-2022
    uid: c8e3f12a-b123-4112-ab81-46451d3ec10a
  resourceVersion: "32248908"
  uid: 58e551f2-3ee1-4d63-b72c-a9fd0905369c
spec:
  accessModes:
  - ReadWriteOnce
  dataSource:
    apiGroup: snapshot.storage.k8s.io
    kind: VolumeSnapshot
    name: vmsnapshot-6100c8ae-87e7-4836-b141-1b71d6767825-volume-persistent-state-for-windows-2022
  dataSourceRef:
    apiGroup: snapshot.storage.k8s.io
    kind: VolumeSnapshot
    name: vmsnapshot-6100c8ae-87e7-4836-b141-1b71d6767825-volume-persistent-state-for-windows-2022
  resources:
    requests:
      storage: "333447168"
  storageClassName: lvms-nvme
  volumeMode: Filesystem
status:
  phase: Pending