Re: [Qemu-devel] [PATCH 2/5] target/arm: Fill in ARMISARegisters for kvm64

[Richard Henderson]

On 10/29/18 2:58 PM, Peter Maydell wrote:
> I think I would prefer it if we expanded the id_isar* fields
> in the ARMISARegisters struct to uint64_t. If you dislike
> that, I think we should make this code fail a bit more gracefully
> in the presence of an unexpected extension into the high bits
> of these registers. Or just ignore the high bits, since we're
> effectively trusting that future architecture versions use
> a compatible meaning for these registers anyway.

Given these options, I'd prefer to just ignore the high bits.
I'm fairly comfortable trusting that the architecture gods
won't mess up and assign values in there.  Otherwise they
would have already expanded instead of adding ID_ISAR6.


r~