linux-kernel - RE: [PATCH 2/2] iommu/ioasid: Remove custom IOASID allocator

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Message-ID: <BN9PR11MB5276695C57522C341CE1710B8CA39@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Wed, 15 Feb 2023 01:39:12 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Jason Gunthorpe <jgg@...dia.com>
CC:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        "Jean-Philippe Brucker" <jean-philippe@...aro.com>,
        Robin Murphy <robin.murphy@....com>,
        David Woodhouse <dwmw2@...radead.org>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>
Subject: RE: [PATCH 2/2] iommu/ioasid: Remove custom IOASID allocator

> From: Jason Gunthorpe <jgg@...dia.com>
> Sent: Tuesday, February 14, 2023 10:56 PM
> 
> On Tue, Feb 14, 2023 at 06:26:25AM +0000, Tian, Kevin wrote:
> > > From: Jason Gunthorpe <jgg@...dia.com>
> > > Sent: Tuesday, February 14, 2023 7:46 AM
> > >
> > > > > So if a cgroup comes it is just a matter of putting charges in the
> > > > > right place which is auditable by looking at calls to attach pasid
> > > > > functions.
> > > > shouldn't we charge cg during allocation? Or it might be too early for
> > > > iommufd so we have to wait  until attach?
> > >
> > > We need to sort this all out. I would expect that iommufd will have an
> > > allocation API.
> > >
> >
> > yes.
> >
> > btw presumably iommu_global_pasid_ida should be move to iommu.c
> > since it will be used beyond sva.
> 
> Yeah, maybe, I'd think about moving it when we get patches to use it
> more than SVA.
> 

that also works.