Re: [Qemu-devel] [PATCH v8 07/13] target-arm: Make PMCEID[01]_EL0 64 bit registers, add PMCEID[23]

[Peter Maydell]

On Mon, 3 Dec 2018 at 20:45, Aaron Lindsay <address@hidden> wrote:
>
> On Nov 30 16:10, Peter Maydell wrote:
> > PMCEID2 and PMCEID3 are only defined from ARMv8.1; before that they
> > are UNDEFINED. So these registers need to be only defined if a
> > suitable feature bit or ID register field check passes.
>
> It looks like we don't currently support any ARMv8.1+ CPUs and don't
> have an entry in the `arm_features` enum for it. I'll plan to add
> ARM_FEATURE_V81 and make defining these registers depend on it, assuming
> any future CPUs supporting it will use that, unless you feel I should do
> something different.

I think that the idea going forward is to prefer an ID
register check of some kind -- Richard ?

thanks
-- PMM