[RFC PATCH 2/9] KVM: PPC: Book3S 64: Move GUEST_MODE_SKIP test into KVM

[Nicholas Piggin]

Excerpts from Fabiano Rosas's message of February 13, 2021 6:33 am:
> Nicholas Piggin <npiggin at gmail.com> writes:
> 
>> Move the GUEST_MODE_SKIP logic into KVM code. This is quite a KVM
>> internal detail that has no real need to be in common handlers.
> 
> LGTM,
> 
>>
>> (XXX: Need to confirm CBE handlers etc)
> 
> Do these interrupts exist only in Cell? I see that they set HSRRs and
> MSR_HV, but CPU_FTRS_CELL does not contain CPU_HVMODE. So I don't get
> why they use the KVM macros.

Good question, I asked Michael Ellerman and he said there is a bare 
metal Cell which predates or otherwise does not define HVMODE.

However it does not support KVM. So I think we can remove it.

> And for the instruction_breakpoint (0x1300) I think it would help if we
> could at least restrict when it is built. But I don't know what
> ISA/processor version it is from.

Yeah we should be documenting these non-architected handlers a little 
better IMO.

I think we can get rid of the kvm skip from this one though. I've done 
that in a separate patch in the next series.

Thanks,
Nick