Re: [PATCH] KVM: arm64: Cleanup the __get_fault_info() to take out the code that validates HPFAR

[Mingwei Zhang]

>
> Honestly, I'd refrain from such changes *unless* they enable something
> else. The current code is well understood by people hacking on it, and
> although I don't mind revamping it, it has to be for a good reason.
>
> I'd be much more receptive to such a change if it was a prefix to
> something that actually made a significant change.
>
> Thanks,
>
>         M.
>
Hi Marc,

Thanks for the feedback.  I am not sure about the style of the KVM ARM
side. But in general I think mixing the generic code for ARM and
specific CPU errata handling is misleading. For instance, in this
case:

+     if ((esr & ESR_ELx_FSC_TYPE) == FSC_PERM)
+             return false;
+
+     if (cpus_have_final_cap(ARM64_WORKAROUND_834220))
+             return false;

As shown it would be much cleaner to separate the two cases as the
former case is suggested in ARMv8 Spec D13.2.55. The latter case would
definitely come from a different source.

But I also don't have a strong opinion pushing this one. So, let me
pull it back then :)