linux-kernel - Re: [PATCH v4 5/7] iommu: Add iommu_get_domain_for_dev

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Message-ID: <20250924195254.GL2617119@nvidia.com>
Date: Wed, 24 Sep 2025 16:52:54 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
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Subject: Re: [PATCH v4 5/7] iommu: Add iommu_get_domain_for_dev_locked()
 helper

On Wed, Sep 24, 2025 at 12:49:14PM -0700, Nicolin Chen wrote:
> > I really wanted to say this should just always return the
> > default_domain, but it looks like host1x_client_iommu_detach() is the
> > only place outside the iommu drivers that would be unhappy with that.
> 
> I suppose any external user that allocates/attaches a domain has a
> risk of potentially using this helper, in which case group->domain
> may not be default_domain?

Yes, host1x seemed to be the only place that had that intersection.

Jason