Re: [PATCH 06/17] iommufd/hw_pagetable: Use domain_alloc_user op for domain allocation

[Jason Gunthorpe]

On Thu, Feb 09, 2023 at 12:59:58PM -0500, Matthew Rosato wrote:
> really should highlight that).  Otherwise, conditionally calling
> iommu_domain_alloc(dev->bus) when !ops->domain_alloc_user (instead
> of returning -EOPNOTSUPP) seems to restore the prior functionality
> for me.

Yes, that is right if the input user data is 0 length or full of 0s
then we should call the normal driver function

Jason