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

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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



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