Messages in this thread | | | Date | Mon, 22 Jun 2020 11:20:41 +0100 | From | David Brazdil <> | Subject | Re: [PATCH v3 05/15] arm64: kvm: Build hyp-entry.S separately for VHE/nVHE |
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Hi Marc,
> > - void *dst = lm_alias(__bp_harden_hyp_vecs + slot * SZ_2K); > > + char *vec = has_vhe() ? __bp_harden_hyp_vecs > > + : kvm_nvhe_sym(__bp_harden_hyp_vecs); > > If we get this construct often, then something that abstracts > the uggliness of the symbol duality would be nice...
Agreed, I do hope that this will end up being limited to finding the address of the hyp-init vector once EL2 becomes self-contained. Even this vector selection can be done in EL2 where the symbol duality does not exist. If we were to hide it, there is a trade off between code "elegance" and clarity of what's happening under the hood. I was thinking we could extract this `has_vhe() ? foo : __kvm_nvhe_foo` as a `#define foo` but I do worry that anybody debugging this code would be cursing my name. It would also not work with other macros that take symbol names, notably kvm_ksym_ref. But that can be rewritten to accept a pointer instead. The more verbose but less magic approach is to have a bunch of different helpers for various situations, eg. __pa_symbol_nvhe. What would be your preference?
-David
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