Re: [PATCH v4 03/13] PCI: pci_stub: Suppress kernel DMA ownership auto-claiming

[Lu Baolu]

On 1/4/22 3:53 AM, Jason Gunthorpe wrote:
> On Fri, Dec 31, 2021 at 09:10:43AM +0800, Lu Baolu wrote:
>
> > We still need to call iommu_device_use_dma_api() in bus dma_configure()
> > callback. But we can call iommu_device_unuse_dma_api() in the .probe()
> > of vfio (and vfio-approved) drivers, so that we don't need the new flag
> > anymore.
>
> No, we can't. The action that iommu_device_use_dma_api() takes is to
> not call probe, it obviously cannot be undone by code inside probe.

Yes. Agreed.

> Jason

Best regards,
baolu