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Date:   Wed, 21 Oct 2020 08:48:29 -0300
From:   Jason Gunthorpe <jgg@nvidia.com>
To:     "Raj, Ashok" <ashok.raj@intel.com>
CC:     "Liu, Yi L" <yi.l.liu@intel.com>,
        "Tian, Kevin" <kevin.tian@intel.com>,
        Jason Wang <jasowang@redhat.com>,
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        "Michael S. Tsirkin" <mst@redhat.com>,
        "Zhu, Lingshan" <lingshan.zhu@intel.com>
Subject: Re: (proposal) RE: [PATCH v7 00/16] vfio: expose virtual Shared
 Virtual Addressing to VMs
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On Tue, Oct 20, 2020 at 01:27:13PM -0700, Raj, Ashok wrote:
> On Tue, Oct 20, 2020 at 05:14:03PM -0300, Jason Gunthorpe wrote:
> > On Tue, Oct 20, 2020 at 01:08:44PM -0700, Raj, Ashok wrote:
> > > On Tue, Oct 20, 2020 at 04:55:57PM -0300, Jason Gunthorpe wrote:
> > > > On Tue, Oct 20, 2020 at 12:51:46PM -0700, Raj, Ashok wrote:
> > > > > I think we agreed (or agree to disagree and commit) for device types that 
> > > > > we have for SIOV, VFIO based approach works well without having to re-invent 
> > > > > another way to do the same things. Not looking for a shortcut by any means, 
> > > > > but we need to plan around existing hardware though. Looks like vDPA took 
> > > > > some shortcuts then to not abstract iommu uAPI instead :-)? When all
> > > > > necessary hardware was available.. This would be a solved puzzle. 
> > > > 
> > > > I think it is the opposite, vIOMMU and related has outgrown VFIO as
> > > > the "home" and needs to stand alone.
> > > > 
> > > > Apparently the HW that will need PASID for vDPA is Intel HW, so if
> > > 
> > > So just to make this clear, I did check internally if there are any plans
> > > for vDPA + SVM. There are none at the moment. 
> > 
> > Not SVM, SIOV.
> 
> ... And that included.. I should have said vDPA + PASID, No current plans. 
> I have no idea who set expectations with you. Can you please put me in touch 
> with that person, privately is fine.

It was the team that aruged VDPA had to be done through VFIO - SIOV
and PASID was one of their reasons it had to be VFIO, check the list
archives

If they didn't plan to use it, bit of a strawman argument, right?

Jason