[PATCH] vfio: Remove VFIO_TYPE1_NESTING_IOMMU

[zhangfei.gao at foxmail.com]

On 2022/5/12 下午7:32, Jason Gunthorpe via iommu wrote:
> On Thu, May 12, 2022 at 03:07:09PM +0800, Zhangfei Gao wrote:
>>>> I can't help feeling a little wary about removing this until IOMMUFD
>>>> can actually offer a functional replacement - is it in the way of
>>>> anything upcoming?
>>>   From an upstream perspective if someone has a patched kernel to
>>> complete the feature, then they can patch this part in as well, we
>>> should not carry dead code like this in the kernel and in the uapi.
>>>
>>> It is not directly in the way, but this needs to get done at some
>>> point, I'd rather just get it out of the way.
>> We are using this interface for nested mode.
> How are you using it? It doesn't do anything. Do you have out of tree
> patches as well?

Yes, there are some patches out of tree, since they are pending for 
almost one year.

By the way, I am trying to test nesting mode based on iommufd, still 
requires iommu_enable_nesting,
which is removed in this patch as well.

So can we wait for alternative patch then remove them?

Thanks