Re: [PATCH v1 1/5] iommufd: Create access in vfio_iommufd_emulated_bind()

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Hi Kevin,

I've fixed the other two commits. Here is the one that I am
not sure about:

On Thu, Mar 16, 2023 at 02:53:50AM +0000, Tian, Kevin wrote:

> > [2] This adds iommufd_access_detach() in the cdev series:
> >     "iommufd/device: Add iommufd_access_detach() API"
> >
> > https://github.com/nicolinc/iommufd/commit/4110522146ca1fc0d5321c04a
> > 097e2c9d9e26af4
> 
> also add a check if old_ioas exists it must equal to the new_ioas in attach.

This is the commit adding detach(). And there's a check in it:
	if (WARN_ON(!access->ioas))

Do you mean having an "if (access->ioas) return -EBUSY;" line
in the commit adding attach()?

And, how should we check in the detach() if it equals to the
new_ioas in attach? Isn't the WARN_ON(!access->ioas) enough?

Thanks
Nic



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