From: Jason Gunthorpe <jgg@nvidia.com>
To: Jacob Pan <jacob.pan@linux.microsoft.com>
Cc: Mostafa Saleh <smostafa@google.com>,
linux-kernel@vger.kernel.org,
"iommu@lists.linux.dev" <iommu@lists.linux.dev>,
Alex Williamson <alex@shazbot.org>,
Joerg Roedel <joro@8bytes.org>,
David Matlack <dmatlack@google.com>,
Robin Murphy <robin.murphy@arm.com>,
Nicolin Chen <nicolinc@nvidia.com>,
"Tian, Kevin" <kevin.tian@intel.com>, Yi Liu <yi.l.liu@intel.com>,
skhawaja@google.com, pasha.tatashin@soleen.com,
Will Deacon <will@kernel.org>,
Baolu Lu <baolu.lu@linux.intel.com>
Subject: Re: [PATCH V2 01/11] iommufd: Support a HWPT without an iommu driver for noiommu
Date: Mon, 23 Mar 2026 19:10:34 -0300 [thread overview]
Message-ID: <20260323221034.GS7340@nvidia.com> (raw)
In-Reply-To: <20260323141132.00003dc7@linux.microsoft.com>
On Mon, Mar 23, 2026 at 02:11:32PM -0700, Jacob Pan wrote:
> +/*
> + * AMDV1 is used as a dummy page table for no-IOMMU mode, similar to the
> + * iommufd selftest mock page table.
> + * Unlike legacy VFIO no-IOMMU mode, where no container level APIs are
> + * supported, this allows IOAS and hwpt objects to exist without hardware
> + * IOMMU support. IOVAs are used only for IOVA-to-PA lookups not for
> + * hardware translation in DMA.
> + *
> + * This is only used with iommufd and cdev-based interfaces and does not
> + * apply to legacy VFIO group-container based noiommu mode.
> + */
> static const struct iommu_domain_ops noiommu_amdv1_ops = {
That seems clear
Jason
next prev parent reply other threads:[~2026-03-23 22:10 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-12 15:56 [PATCH V2 00/11] iommufd: Enable noiommu mode for cdev Jacob Pan
2026-03-12 15:56 ` [PATCH V2 01/11] iommufd: Support a HWPT without an iommu driver for noiommu Jacob Pan
2026-03-18 18:38 ` Samiullah Khawaja
2026-03-23 13:17 ` Jason Gunthorpe
2026-03-24 17:42 ` Samiullah Khawaja
2026-03-22 9:24 ` Mostafa Saleh
2026-03-23 21:11 ` Jacob Pan
2026-03-23 22:10 ` Jason Gunthorpe [this message]
2026-03-12 15:56 ` [PATCH V2 02/11] iommufd: Move igroup allocation to a function Jacob Pan
2026-03-18 18:39 ` Samiullah Khawaja
2026-03-22 9:41 ` Mostafa Saleh
2026-03-23 22:51 ` Jacob Pan
2026-03-23 16:46 ` Samiullah Khawaja
2026-03-12 15:56 ` [PATCH V2 03/11] iommufd: Allow binding to a noiommu device Jacob Pan
2026-03-22 9:54 ` Mostafa Saleh
2026-03-23 13:20 ` Jason Gunthorpe
2026-03-24 19:13 ` Jacob Pan
2026-03-12 15:56 ` [PATCH V2 04/11] iommufd: Add an ioctl IOMMU_IOAS_GET_PA to query PA from IOVA Jacob Pan
2026-03-12 15:56 ` [PATCH V2 05/11] vfio: Allow null group for noiommu without containers Jacob Pan
2026-03-22 9:59 ` Mostafa Saleh
2026-03-23 13:21 ` Jason Gunthorpe
2026-03-12 15:56 ` [PATCH V2 06/11] vfio: Introduce and set noiommu flag on vfio_device Jacob Pan
2026-03-22 10:02 ` Mostafa Saleh
2026-03-12 15:56 ` [PATCH V2 07/11] vfio: Update noiommu device detection logic for cdev Jacob Pan
2026-03-22 10:04 ` Mostafa Saleh
2026-04-01 22:17 ` Jacob Pan
2026-03-12 15:56 ` [PATCH V2 08/11] vfio: Enable cdev noiommu mode under iommufd Jacob Pan
2026-03-14 8:09 ` kernel test robot
2026-03-12 15:56 ` [PATCH V2 09/11] vfio:selftest: Handle VFIO noiommu cdev Jacob Pan
2026-03-12 15:56 ` [PATCH V2 10/11] selftests/vfio: Add iommufd noiommu mode selftest for cdev Jacob Pan
2026-03-12 15:56 ` [PATCH V2 11/11] Doc: Update VFIO NOIOMMU mode Jacob Pan
2026-03-13 17:48 ` kernel test robot
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