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Message-ID: <BN9PR11MB54331F80DA135AF3EAD025998C149@BN9PR11MB5433.namprd11.prod.outlook.com>
Date: Tue, 13 Jul 2021 23:20:12 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Jason Gunthorpe <jgg@...dia.com>
CC: Alex Williamson <alex.williamson@...hat.com>,
Jean-Philippe Brucker <jean-philippe@...aro.org>,
David Gibson <david@...son.dropbear.id.au>,
"Jason Wang" <jasowang@...hat.com>,
"parav@...lanox.com" <parav@...lanox.com>,
"Enrico Weigelt, metux IT consult" <lkml@...ux.net>,
Paolo Bonzini <pbonzini@...hat.com>,
Shenming Lu <lushenming@...wei.com>,
Joerg Roedel <joro@...tes.org>,
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>,
"Kirti Wankhede" <kwankhede@...dia.com>,
Robin Murphy <robin.murphy@....com>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
"David Woodhouse" <dwmw2@...radead.org>,
LKML <linux-kernel@...r.kernel.org>,
"Lu Baolu" <baolu.lu@...ux.intel.com>
Subject: RE: [RFC v2] /dev/iommu uAPI proposal
> From: Jason Gunthorpe <jgg@...dia.com>
> Sent: Wednesday, July 14, 2021 7:03 AM
>
> On Tue, Jul 13, 2021 at 10:48:38PM +0000, Tian, Kevin wrote:
>
> > We can still bind to the parent with cookie, but with
> > iommu_register_ sw_device() IOMMU fd knows that this binding doesn't
> > need to establish any security context via IOMMU API.
>
> AFAIK there is no reason to involve the parent PCI or other device in
> SW mode. The iommufd doesn't need to be aware of anything there.
>
Yes. but does it makes sense to have an unified model in IOMMU fd
which always have a [struct device, cookie] with flags to indicate whether
the binding/attaching should be specially handled for sw mdev? Or
are you suggesting that lacking of struct device is actually the indicator
for such trick?
Thanks
Kevin
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