Re: [PATCH v5 00/14] Fix BUG_ON in vfio_iommu_group_notifier()

[Jason Gunthorpe]

On Tue, Jan 04, 2022 at 09:56:30AM +0800, Lu Baolu wrote:

> v5:
>   - Move kernel dma ownership auto-claiming from driver core to bus
>     callback. (Greg)
>   - Refactor the iommu interfaces to make them more specific.
>     (Jason/Robin)
>   - Simplify the dma ownership implementation by removing the owner
>     type. (Jason)
>   - Commit message refactoring for PCI drivers. (Bjorn)
>   - Move iommu_attach/detach_device() improvement patches into another
>     series as there are a lot of code refactoring and cleanup staffs
>     in various device drivers.

Since you already have the code you should make this 'other series'
right now. It should delete iommu_group_attach() and fix
iommu_device_attach().

You also didn't really do my suggestion, this messes up the normal
__iommu_attach_group()/__iommu_detach_group() instead of adding the
clear to purpose iommu_replace_group() for VFIO to use. This just
makes it more difficult to normalize the APIs.

Otherwise it does seem to have turned out to be more understandable.

Jason