> From: [email protected] <[email protected]>
> Sent: Monday, October 18, 2021 7:38 PM
>
> 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.
>
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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