linux-kernel - Re: [PATCH RFC 06/11] iommu/sva: Use attach/detach_pasid

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Date:   Mon, 21 Mar 2022 09:03:37 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     "Tian, Kevin" <kevin.tian@...el.com>,
        Joerg Roedel <joro@...tes.org>,
        Christoph Hellwig <hch@...radead.org>,
        "Raj, Ashok" <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Eric Auger <eric.auger@...hat.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC 06/11] iommu/sva: Use attach/detach_pasid_dev in SVA
 interfaces

On Mon, Mar 21, 2022 at 07:01:45PM +0800, Lu Baolu wrote:

> > one domain can be attached by multiple devices, so this should not be
> > a blind alloc.
> 
> Indeed. Perhaps we could associate the SVA domain with the mm->pasid and
> add a user counter inside the domain.

This has the same problem as VFIO it needs to keep a list of
automatically created iommu domains in the mm_struct and try to re-use
them every time a device is bound.

Jason