How to handle the supervisor call in Xen on ARM?

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How to handle the supervisor call in Xen on ARM?

harry2845
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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.