linux-kernel - RE: [RFC 01/20] iommu/iommufd: Add /dev/iommu core

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Message-ID: <BN9PR11MB543344B31D1AC7C8BC054E268CA29@BN9PR11MB5433.namprd11.prod.outlook.com>
Date:   Wed, 22 Sep 2021 01:51:03 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Jason Gunthorpe <jgg@...dia.com>, "Liu, Yi L" <yi.l.liu@...el.com>
CC:     "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
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Subject: RE: [RFC 01/20] iommu/iommufd: Add /dev/iommu core

> From: Jason Gunthorpe <jgg@...dia.com>
> 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?