linux-kernel - RE: [PATCH v2 08/14] vfio: Add infrastructure for bind

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Message-ID: <BN9PR11MB52767B2B0882B845C75026D68CDB9@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Tue, 7 Feb 2023 03:56:06 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     "Liu, Yi L" <yi.l.liu@...el.com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "jgg@...dia.com" <jgg@...dia.com>
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Subject: RE: [PATCH v2 08/14] vfio: Add infrastructure for bind_iommufd from
 userspace

> From: Liu, Yi L <yi.l.liu@...el.com>
> Sent: Monday, February 6, 2023 5:05 PM
> 
> For the device fd opened from cdev, userspace needs to bind it to an
> iommufd and attach it to IOAS managed by iommufd. With such operations,
> userspace can set up a secure DMA context and hence access device.
> 
> This changes the existing vfio_iommufd_bind() to accept a pt_id pointer
> as an optional input, and also an dev_id pointer to selectively return
> the dev_id to prepare for adding bind_iommufd ioctl, which does the bind
> first and then attach IOAS.
> 
> Signed-off-by: Yi Liu <yi.l.liu@...el.com>

Reviewed-by: Kevin Tian <kevin.tian@...el.com>