[PATCH v4 18/23] iommu/arm-smmu-v3-iommufd: Support implementation-defined hw_info

[Jason Gunthorpe]

On Thu, May 15, 2025 at 01:17:47PM -0700, Nicolin Chen wrote:
> > I think the former is simpler to code, you can just add the req_type
> > to the signatures and if the driver comes back with a type != req_type
> > the core code will return EOPNOTSUPP
> 
> OK.
> 
> Maybe just turn the out_data_type to be bidirectional?

You can do that, bu you need to add a flag to turn it on.  We didn't
validate that it was 0 on input before so we can't start now.

Jason