Re: [PATCH v2 4/7] iommu: Let iommu.strict override ops->def_domain_type

[Jason Gunthorpe]

On Mon, Nov 28, 2022 at 09:01:43PM +0000, Robin Murphy wrote:

> I'm hardly an advocate for trying to save users from themselves, but I
> honestly can't see any justifiable reason for not having sysfs respect
> iommu_get_def_domain_type(). 

We really need to rename this value if it is not actually just an
advisory "default" but a functional requirement ..

> > The driver should have no say in how dma-iommu.c works beyond if it
> > provides the required ops functionalities, and hint(s) as to what
> > gives best performance.
> 
> That should already be the case today, as outlined in my other mail. It's
> just somewhat more evolved than designed, so may not be so clear to
> everyone.

It is close to being clear, once we get the last touches of dma-iommu
stuff out of the drivers it should be quite clear

Thanks,
Jason