Re: [PATCH v4 17/33] target/nios2: Prevent writes to read-only or reserved control fields

[Peter Maydell]

On Tue, 8 Mar 2022 at 07:20, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> Create an array of masks which detail the writable and readonly
> bits for each control register.  Apply them when writing to
> control registers.
>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

What's the justification for this extra machinery? Does
existing guest code rely on writes to r/o bits being ignored ?

-- PMM