linux-kernel - Re: [RFC v1 8/8] iommu: expose the function iommu_device_use_default

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Message-ID: <20231103173750.GC4488@nvidia.com>
Date:   Fri, 3 Nov 2023 14:37:50 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Cindy Lu <lulu@...hat.com>
Cc:     jasowang@...hat.com, mst@...hat.com, yi.l.liu@...el.com,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [RFC v1 8/8] iommu: expose the function
 iommu_device_use_default_domain

On Sat, Nov 04, 2023 at 01:16:41AM +0800, Cindy Lu wrote:
> Expose the function iommu_device_use_default_domain() and
> iommu_device_unuse_default_domain()，
> While vdpa bind the iommufd device and detach the iommu device,
> vdpa need to call the function
> iommu_device_unuse_default_domain() to release the owner

Definately not. You need to set the driver_managed_dma flag.

Jason