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Not much public yet about VRE virtualisation (which includes SEP) at this point.

> whose only purpose would be to capture those HVCs

quite expensive because you get to trap ~ all EL0 -> EL1 priv transitions through the virtualisation infrastructure as the sync handler has a lot going through it

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Only if you used a breakpoint or something similar. I believe a "shadow" exception vector like that can run entirely in the guest context with the guest not even being aware of this (MRS is generally always trapped so you can return the address of the real one while still taking exceptions to the injected one).

Figuring out where to put it and how to keep it mapped is another problem, though!

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