[PATCH 3/4] iommu/arm-smmu-v3: Add explicit feature for nesting

[Nicolin Chen]

On Wed, May 10, 2023 at 04:38:45PM +0100, Robin Murphy wrote:

> In certain cases we may want to refuse to allow nested translation even
> when both stages are implemented, so let's add an explicit feature for
> nesting support which we can control in its own right. For now this
> merely serves as documentation, but it means a nice convenient check
> will be ready and waiting for the future nesting code.
> 
> Signed-off-by: Robin Murphy <robin.murphy at arm.com>

Reviewed-by: Nicolin Chen <nicolinc at nvidia.com>