linux-kernel - Re: [PATCH v2 3/6] iommufd: Initializing and releasing IO page fault data

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Message-ID: <20231213131958.GF3013885@ziepe.ca>
Date:   Wed, 13 Dec 2023 09:19:58 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     "Tian, Kevin" <kevin.tian@...el.com>
Cc:     Baolu Lu <baolu.lu@...ux.intel.com>,
        Joel Granados <j.granados@...sung.com>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Nicolin Chen <nicolinc@...dia.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/6] iommufd: Initializing and releasing IO page fault
 data

On Wed, Dec 13, 2023 at 02:15:28AM +0000, Tian, Kevin wrote:
> > From: Baolu Lu <baolu.lu@...ux.intel.com>
> > Sent: Wednesday, December 13, 2023 10:05 AM
> > >
> > >> 2. This is not intended to work only with idxd and uacce. right?
> > > It should work everywhere, I suspect Intel Team didn't hit this
> > > because they are testing IDXD SIOV?
> > 
> > Yes.
> > 
> > > Can you guys also test it as a PF
> > > assignment?
> > 
> > For PF assignment, probably the driver (vfio-pci) needs to enable iopf.
> > 
> 
> We haven't merged anything for SIOV yet.
> 
> so the base of this series should be PCI functions (PF or VF) and vfio-pci
> has to be extended with whatever required to support iopf.

Right. I suggest you target full idxd device assignment to a guest
with working PRI/etc as a validation.

Jason