linux-kernel - Re: [PATCH v5 5/6] iommu/arm-smmu-v3: Free pasid domains on iommu release

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Message-ID: <ZMvF0HfPkn3rdnJZ@nvidia.com>
Date:   Thu, 3 Aug 2023 12:20:48 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Michael Shavit <mshavit@...gle.com>
Cc:     iommu@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, baolu.lu@...ux.intel.com,
        will@...nel.org, jean-philippe@...aro.org, robin.murphy@....com,
        nicolinc@...dia.com
Subject: Re: [PATCH v5 5/6] iommu/arm-smmu-v3: Free pasid domains on iommu
 release

On Thu, Aug 03, 2023 at 06:17:15PM +0800, Michael Shavit wrote:
> On Thu, Aug 3, 2023 at 6:14 PM Michael Shavit <mshavit@...gle.com> wrote:
> >
> > The iommu core doesn't guarantee that pasid domains will be detached
> > before the device is released.
> 
> I'm not certain whether this is possible or not. Is this change really
> necessary?

I think we should rely on the core code to detach all PASIDs prior to
calling release, drivers should not do this. I suppose that means we
have a missing bit in the core code.

FWIW, I'd like to get to a point where the core code can also
automatically attach an identity domain so that the driver's release
functions don't have to open code that either...

Thus I wouldn't do this patch..

Jason