Re: [PATCH 1/4] target/arm/tcg/cpu-v7m.c: add cortex-m85 model

> The major reason IMHO to add a Cortex-M85 model would be to
> have a CPU that supports M-profile PACBTI, so wouldn't
> it be better to implement the feature first and then
> add the CPU and the board model that uses it ?
>
> thanks
> -- PMM

Hey Peter, thanks for the quick reply on this and the other bug fix patch I sent!

I understand your reasoning behind adding the feature first then the CPU/boards
so that there's something to use the features. I looked through the patchew and
saw that was how you handled it with the M55 CPU and v8.1-m features.

To explain myself, this patch series was a part of my intern project at HPE. We
currently have a fork of QEMU where we use it to emulate the HPE BMC. I am
working on implementing the currently unavailable M85 CPU with the Custom
Datapath Extension for internal use. I thought I could potentially upstream only
the M85 CPU and related machines. I didn't include CDE because it was not fully
polished and PACBTI because it was not super critical to my experimentations.

I do agree there are no architectural differences between the M55 and M85 right
now so I fully understand if this patch series is not sufficient for upstreaming.

Best regards,
Simon Xu