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Date: Fri, 22 May 2026 20:42:10 -0700
From: Jacob Pan <jacob.pan@linux.microsoft.com>
To: Yi Liu <yi.l.liu@intel.com>
Cc: <linux-kernel@vger.kernel.org>, "iommu@lists.linux.dev"
 <iommu@lists.linux.dev>, Jason Gunthorpe <jgg@nvidia.com>, Alex Williamson
 <alex@shazbot.org>, Joerg Roedel <joro@8bytes.org>, Mostafa Saleh
 <smostafa@google.com>, David Matlack <dmatlack@google.com>, Robin Murphy
 <robin.murphy@arm.com>, Nicolin Chen <nicolinc@nvidia.com>, "Tian, Kevin"
 <kevin.tian@intel.com>, Baolu Lu <baolu.lu@linux.intel.com>, Saurabh Sengar
 <ssengar@linux.microsoft.com>, <skhawaja@google.com>,
 <pasha.tatashin@soleen.com>, Will Deacon <will@kernel.org>,
 jacob.pan@linux.microsoft.com
Subject: Re: [PATCH v6 7/7] Documentation: Update VFIO NOIOMMU mode
Message-ID: <20260522204210.00002858@linux.microsoft.com>
In-Reply-To: <18733b82-9f59-4a4b-b37c-69a2e367a0ab@intel.com>
References: <20260521221155.1375144-1-jacob.pan@linux.microsoft.com>
	<20260521221155.1375144-8-jacob.pan@linux.microsoft.com>
	<18733b82-9f59-4a4b-b37c-69a2e367a0ab@intel.com>
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Hi Yi,

On Fri, 22 May 2026 17:42:42 +0800
Yi Liu <yi.l.liu@intel.com> wrote:

> > ++------+-------+-----------+------+---------+-------------------------=
--+
> > +| Case | GROUP | Container | CDEV | NOIOMMU | Notes
> >      |
> > ++=3D=3D=3D=3D=3D=3D+=3D=3D=3D=3D=3D=3D=3D+=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D+=3D=3D=3D=3D=3D=3D+=3D=3D=3D=3D=3D=3D=3D=3D=3D+=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D+
> > +|  1   |   y   |     y     |  n   |   yes   | Group noiommu works
> >      |
> > ++------+-------+-----------+------+---------+-------------------------=
--+
> > +|  2   |   y   |     n     |  n   |   no    | Blocked - no
> > container    |
> > ++------+-------+-----------+------+---------+-------------------------=
--+
> > +|  3   |   y   |     y     |  y   |   yes   | Both paths work
> >      |
> > ++------+-------+-----------+------+---------+-------------------------=
--+
> > +|  4   |   y   |     n     |  y   |   no    | Blocked - no
> > container    |
> > ++------+-------+-----------+------+---------+-------------------------=
--+
> > +|  5   |   n   |     -     |  y   |   yes   | Cdev-only works
> >      |
> > ++------+-------+-----------+------+---------+-------------------------=
--+
> > +|  6   |   n   |     -     |  n   |   no    | No access path
> >      |
> > ++------+-------+-----------+------+---------+-------------------------=
--+
> > + =20
>=20
> Does "Bloked" mean no access path or no chance to compile? :)
By =E2=80=9CBlocked=E2=80=9D, I mean Kconfig prevents that combination from=
 being
selected, so it is not buildable as such; consequently there is no
access path at runtime.