IWM4EDEL – Deleting an Enclave

The purpose of this service is to delete an enclave, so that no SRBs or TCBs exist within the enclave and no new SRBs may be scheduled into the enclave, nor may any TCBs join the enclave. Some residual enclave-related CPU time will not be accounted back to the work request whenever active enclave SRBs/TCBs were present at the time IWM4EDEL is invoked. SRBs scheduled to the enclave which have not completed will be converted to ordinary preemptable SRBs. TCBs joined to the enclave which have not completed will be converted to ordinary TCBs.

If IWM4EDEL is invoked for an enclave which is registered, the enclave is considered only logically deleted while all its functionality stays in place. Physical deletion is deferred until all interested parties have deregistered the enclave. The caller does not receive any notice when the physical deletion of the enclave is done.

When an enclave is deleted, the work request is considered to have finished and all related resource accounting will be finalized.

IWM4EDEL cannot be used to delete a foreign enclave. The IWMUIMPT macro must be used instead.