Re: [PATCH v3 60/66] tcg/aarch64: Support raising sigbus for user-only

[Peter Maydell]

On Wed, 18 Aug 2021 at 20:56, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> Use load-acquire / store-release for the normal case of
> alignment matching the access size.  Otherwise, emit a
> test + branch sequence invoking helper_unaligned_mmu.

I don't think this trick will work for a CPU that
implements the FEAT_LSE2 feature -- section B2.5.2 in
the Arm ARM DDI0487G.b says that if LSE2 is implemented
then the CPU either must or can make them just work and do
the unaligned access.

thanks
-- PMM