Messages in this thread | | | Date | Mon, 3 Jan 2022 15:53:18 -0400 | From | Jason Gunthorpe <> | Subject | Re: [PATCH v4 03/13] PCI: pci_stub: Suppress kernel DMA ownership auto-claiming |
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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.
Jason
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