From: Jacob Pan <jacob.pan@linux.microsoft.com>
To: "Tian, Kevin" <kevin.tian@intel.com>
Cc: "linux-kernel@vger.kernel.org" <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>,
"Liu, Yi L" <yi.l.liu@intel.com>,
Baolu Lu <baolu.lu@linux.intel.com>,
Saurabh Sengar <ssengar@linux.microsoft.com>,
"skhawaja@google.com" <skhawaja@google.com>,
"pasha.tatashin@soleen.com" <pasha.tatashin@soleen.com>,
Will Deacon <will@kernel.org>,
jacob.pan@linux.microsoft.com
Subject: Re: [PATCH v7 6/6] Documentation: Update VFIO NOIOMMU mode
Date: Wed, 3 Jun 2026 10:51:04 -0700 [thread overview]
Message-ID: <20260603105104.00001a22@linux.microsoft.com> (raw)
In-Reply-To: <DM6PR11MB3690D6F330CCEB909CEAAD6B8C132@DM6PR11MB3690.namprd11.prod.outlook.com>
Hi Kevin,
On Wed, 3 Jun 2026 06:42:09 +0000
"Tian, Kevin" <kevin.tian@intel.com> wrote:
> > From: Jacob Pan <jacob.pan@linux.microsoft.com>
> > Sent: Wednesday, June 3, 2026 1:45 PM
> > +
> > +* IOMMUFD UAPI is available for VFIO device cdev to pin and map
> > user memory with
> > + the ability to retrieve physical addresses for DMA command
> > submission.
>
> and no need of mlock.
>
> > +
> > +A new IOMMUFD ioctl IOMMU_IOAS_NOIOMMU_GET_PA is added to
> > retrieve the physical
> > +address for a given IOVA. Although there is no physical DMA
> > remapping hardware,
> > +IOMMU_IOAS_MAP_FIXED_IOVA is still used to establish IOVA-to-PA
> > mappings in the
> > +software page table for later IOMMU_IOAS_NOIOMMU_GET_PA lookups.
> > +tools/testing/selftests/vfio/vfio_iommufd_noiommu_test.c provides
> > an example of
> > +using this ioctl in no-IOMMU mode.
> > +
>
> the test case doesn't exist yet.
>
will remove for now.
> Reviewed-by: Kevin Tian <kevin.tian@intel.com>
prev parent reply other threads:[~2026-06-03 17:51 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-03 5:44 [PATCH v7 0/6] iommufd: Enable noiommu mode for cdev Jacob Pan
2026-06-03 5:44 ` [PATCH v7 1/6] iommufd: Support a HWPT without an iommu driver for noiommu Jacob Pan
2026-06-03 6:30 ` Tian, Kevin
2026-06-03 16:56 ` Jacob Pan
2026-06-03 5:44 ` [PATCH v7 2/6] iommufd: Move igroup allocation to a function Jacob Pan
2026-06-03 5:44 ` [PATCH v7 3/6] iommufd: Allow binding to a noiommu device Jacob Pan
2026-06-03 6:32 ` Tian, Kevin
2026-06-03 16:56 ` Jacob Pan
2026-06-03 5:44 ` [PATCH v7 4/6] iommufd: Add an ioctl to query PA from IOVA for noiommu mode Jacob Pan
2026-06-03 6:34 ` Tian, Kevin
2026-06-03 5:44 ` [PATCH v7 5/6] vfio: Enable cdev noiommu mode under iommufd Jacob Pan
2026-06-03 6:38 ` Tian, Kevin
2026-06-03 17:47 ` Jacob Pan
2026-06-03 5:44 ` [PATCH v7 6/6] Documentation: Update VFIO NOIOMMU mode Jacob Pan
2026-06-03 6:42 ` Tian, Kevin
2026-06-03 17:51 ` Jacob Pan [this message]
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