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[Xen-devel] How to handle the supervisor call in Xen on ARM?

Now I've known that if I set the HCR.TGE, the supervisor call will be trapped
into hyp mode. But if I do nothing in hyp mode. After return to user, there
will be a kernel panic.

But I don't know how to handle the supervisor call, could someone give me
some advice? Thank you very much.

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