Does optee-os have time-out mechanism to ensure that executing will not stall into ta code? about optee_os HOT 4 CLOSED

Yes, and even if a timeout is specified it's only an advice. The TA can still refuse to timeout/cancel.

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thanks very much, one more question: a normal world cpu execute "smc" to request secure world do something for it, is it the same cpu entering secure world to process it or it could assign other cpu to do
it in secure world ?

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Yes, it's the same CPU. It's similar to how the "svc" instruction works from user space.

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thank you !

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