From: joro@8bytes.org <joro@8bytes.org>
Sent: Monday, October 18, 2021 7:38 PM

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

quoted

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.

ok. Then there is no problem with the original statement:

    All endpoints managed by the IOMMU should be attached to a 
    domain, so global bypass isn't in use after endpoints are probed.

Thanks
Kevin
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