On Thu, Oct 14, 2021 at 03:00:38AM +0000, Tian, Kevin wrote:

I saw a concept of deferred attach in iommu core. See iommu_is_
attach_deferred(). Currently this is vendor specific and I haven't
looked into the exact reason why some vendor sets it now. Just
be curious whether the same reason might be applied to virtio-iommu.

The reason for attach_deferred is kdump support, where the IOMMU driver
needs to keep the mappings from the old kernel until the device driver
of the new kernel takes over.

Regards,

	Joerg
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