Re: [PATCH v2] vhost/vdpa: Add MSI translation tables to iommu for software-managed MSI

[Jason Gunthorpe]

On Thu, Mar 23, 2023 at 05:22:36PM +0800, Nanyong Sun wrote:
> > A patch to export that function is alread posted:
> > 
> > https://lore.kernel.org/linux-iommu/BN9PR11MB52760E9705F2985EACCD5C4A8CBA9@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/T/#u
> > 
> > But I do not want VDPA to mis-use it unless it also implements all the
> > ownership stuff properly.
> > 

> I want to confirm if we need to introduce iommu group logic to vdpa, as "all
> the ownership stuff" ?

You have to call iommu_device_claim_dma_owner()

But again, this is all pointless, iommufd takes are of all of this and
VDPA should switch to it instead of more hacking.

Jason