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SubjectRE: [RFC 01/20] iommu/iommufd: Add /dev/iommu core
> From: Jason Gunthorpe <>
> Sent: Tuesday, September 21, 2021 11:42 PM
> - Delete the iommufd_ctx->lock. Use RCU to protect load, erase/alloc does
> not need locking (order it properly too, it is in the wrong order), and
> don't check for duplicate devices or dev_cookie duplication, that
> is user error and is harmless to the kernel.

I'm confused here. yes it's user error, but we check so many user errors
and then return -EINVAL, -EBUSY, etc. Why is this one special?

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