af34cd72ca
When a Yielding SMC is preempted, it's possible that Non-secure world is resumed afterwards. In this case, Non-secure execution would find itself in a state where the SMC has returned. However, the dispatcher might not get an opportunity to populate the corrected return code for having been preempted, and therefore the caller of the Yielding SMC cannot reliably determine whether the SMC had successfully completed or had been preempted. To solve this, this patch introduces a new parameter to the ehf_allow_ns_preemption() API. An SPD, through this parameter, would provide the expected error code when a Yielding SMC is preempted. EHF can then populate the specified value in x0 of the Non-secure context so that the caller of the Yielding SMC correctly identifies the SMC return as a preemption. Documentation updates to follow. Change-Id: Ia9c3f8f03f9d72d81aa235eaae2ee0374b972e1e Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com> |
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