Re: [RFC PATCH v6 05/11] iommu: Add a helper to validate a vIOMMU parent

[Jason Gunthorpe]

On Mon, Sep 28, 2026 at 10:55:24PM -0700, Jacob Pan wrote:

> Also, we don't have a T=0 to T=1 transition, our intended external
> attach can be transitioned from a blocked domain, not from a paging
> domain to external.

You kind of do, external is close to T=1..

> > I think you are going to have module dependency issues trying to get
> > the mshv driver's info into the iommu driver, adding a "TSM" like
> > driver would resolve that. ie mshv could just provide the viommu.
> > 
> I introduced a similar registration interface in hv-common to solve the
> module dep issue. Will look into if I can leverage the vIOMMU helper
> here.

That doesn't sound so nice..

If we have to have registrations it is better to have the viommu
registration that Aneesh drafted than several schemes inside specific
drivers..

Jason