[PATCH 20/20] iommu: Convert remaining simple drivers to domain_alloc_paging()

[Niklas Schnelle]

On Tue, 2023-05-02 at 12:25 -0300, Jason Gunthorpe wrote:
> On Tue, May 02, 2023 at 04:52:32PM +0200, Niklas Schnelle wrote:
> > @@ -1947,7 +1948,7 @@ static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
> >         if ((type == IOMMU_DOMAIN_UNMANAGED || type == IOMMU_DOMAIN_DMA) &&
> >             bus->iommu_ops->domain_alloc_paging)
> >                 domain = bus->iommu_ops->domain_alloc_paging(dev);
> > -       else
> > +       else if (bus->iommu_ops->domain_alloc)
> >                 domain = bus->iommu_ops->domain_alloc(type);
> >         if (!domain)
> >                 return NULL;
> 
> Agh, yes, it should fail, this is right, I'll fold it in, thanks
> 
> > This then uses the fallback of an empty IOMMU_DOMAIN_UNMANAGED and I
> > get a working device in the guest. Also tried hot unplug where the
> > device is taken over by the host again.
> 
> Great, thanks, I'll add your tested-by for the s390 drivers.

Yes and with the above change feel free to add my for this patch and
see my other reply for the s390 specific change.

Acked-by: Niklas Schnelle <schnelle at linux.ibm.com> # s390

(I've recently been added as additional S390 IOMMU (PCI) maintainer)