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Update persistent TPM & UEFI page to clarify storageclass requirements #830

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Update persistent TPM & UEFI page to clarify storageclass requirements #830

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78a2507
Update persistent TPM & UEFI to clarify storageclass requirements
ianb-mp Aug 29, 2024
45e5f6b
persistent TPM & UEFI, corrections
ianb-mp Nov 29, 2024
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8 changes: 3 additions & 5 deletions docs/compute/persistent_tpm_and_uefi_state.md
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Expand Up @@ -8,8 +8,8 @@ As of v1.0.0, KubeVirt supports using a PVC to persist those files. KubeVirt usu

## Backend storage

KubeVirt automatically creates backend storage PVCs for VMs that need it. However, the admin must first enable the `VMPersistentState` feature gate, and tell KubeVirt which storage class to use by setting the `vmStateStorageClass` configuration parameter in the KubeVirt Custom Resource (CR).
The storage class must support read-write-many (RWX) in filesystem mode (FS).
KubeVirt automatically creates backend storage PVCs for VMs that need it. However, to persist TPM and UEFI state, the admin must first enable the `VMPersistentState` feature gate. `vmStateStorageClass` may be used to manually specify a storage class, otherwise the default storage class will be used.

Here's an example of KubeVirt CR that sets both:
```yaml
apiVersion: kubevirt.io/v1
Expand All @@ -22,9 +22,7 @@ spec:
- VMPersistentState
```

### Limitations

- As mentioned above, the backend storage PVC can only be created using a storage class that supports RWX FS. There is ongoing work to support block storage in future versions of KubeVirt.
### Notes:
- Backend storage is currently incompatible with VM snapshot. It is planned to add snapshot support in the future.

## TPM with persistent state
Expand Down