Re: [PATCH v5] hw/arm/smmuv3: Add GBPA register

[Peter Maydell]

On Tue, 14 Feb 2023 at 09:40, Mostafa Saleh <smostafa@google.com> wrote:
>
> GBPA register can be used to globally abort all
> transactions.
>
> It is described in the SMMU manual in "6.3.14 SMMU_GBPA".
> ABORT reset value is IMPLEMENTATION DEFINED, it is chosen to
> be zero(Do not abort incoming transactions).
>
> Other fields have default values of Use Incoming.
>
> If UPDATE is not set, the write is ignored. This is the only permitted
> behavior in SMMUv3.2 and later.(6.3.14.1 Update procedure)
>
> As this patch adds a new state to the SMMU (GBPA), it is added
> in a new subsection for forward migration compatibility.
> GBPA is only migrated if its value is different from the reset value.
> It does this to be backward migration compatible if SW didn't write
> the register.
>
> Signed-off-by: Mostafa Saleh <smostafa@google.com>
> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
> Reviewed-by: Eric Auger <eric.auger@redhat.com>



Applied to target-arm.next, thanks.

-- PMM