linux-kernel - RE: [RFC] /dev/ioasid uAPI proposal

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Date:   Fri, 4 Jun 2021 06:27:17 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Jason Gunthorpe <jgg@...dia.com>,
        David Gibson <david@...son.dropbear.id.au>
CC:     LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>,
        David Woodhouse <dwmw2@...radead.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "Alex Williamson (alex.williamson@...hat.com)" 
        <alex.williamson@...hat.com>, Jason Wang <jasowang@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>, "Wu, Hao" <hao.wu@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Kirti Wankhede <kwankhede@...dia.com>,
        Robin Murphy <robin.murphy@....com>
Subject: RE: [RFC] /dev/ioasid uAPI proposal

> From: Jason Gunthorpe <jgg@...dia.com>
> Sent: Thursday, June 3, 2021 8:46 PM
> 
> On Thu, Jun 03, 2021 at 04:26:08PM +1000, David Gibson wrote:
> 
> > > There are global properties in the /dev/iommu FD, like what devices
> > > are part of it, that are important for group security operations. This
> > > becomes confused if it is split to many FDs.
> >
> > I'm still not seeing those.  I'm really not seeing any well-defined
> > meaning to devices being attached to the fd, but not to a particular
> > IOAS.
> 
> Kevin can you add a section on how group security would have to work
> to the RFC? This is the idea you can't attach a device to an IOASID
> unless all devices in the IOMMU group are joined to the /dev/iommu FD.
> 
> The basic statement is that userspace must present the entire group
> membership to /dev/iommu to prove that it has the security right to
> manipulate their DMA translation.
> 
> It is the device centric analog to what the group FD is doing for
> security.
> 

Yes, will do.

Thanks
Kevin