From: Jacob Pan <jacob.pan@linux.microsoft.com>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: kernel test robot <lkp@intel.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>,
Nicolin Chen <nicolinc@nvidia.com>,
"Tian, Kevin" <kevin.tian@intel.com>, Yi Liu <yi.l.liu@intel.com>,
Baolu Lu <baolu.lu@linux.intel.com>,
oe-kbuild-all@lists.linux.dev, skhawaja@google.com,
pasha.tatashin@soleen.com,
Jean Philippe-Brucker <jean-philippe@linaro.org>,
Robin Murphy <robin.murphy@arm.com>
Subject: Re: [PATCH 08/11] vfio: Enable cdev noiommu mode under iommufd
Date: Thu, 5 Mar 2026 15:26:14 -0800 [thread overview]
Message-ID: <20260305152614.00001a0f@linux.microsoft.com> (raw)
In-Reply-To: <20260228003540.GN5933@nvidia.com>
Hi Jason,
On Fri, 27 Feb 2026 20:35:40 -0400
Jason Gunthorpe <jgg@nvidia.com> wrote:
> On Sat, Feb 28, 2026 at 08:18:41AM +0800, kernel test robot wrote:
> > Kconfig warnings: (for reference only)
> > WARNING: unmet direct dependencies detected for IOMMU_PT_AMDV1
> > Depends on [n]: GENERIC_PT [=y] && IOMMU_PT [=y] &&
> > !GENERIC_ATOMIC64 [=y] Selected by [y]:
> > - VFIO_NOIOMMU [=y] && VFIO [=y] && VFIO_GROUP [=y]
>
> Some kconfig stuff is missing, the iommufd IOMMU would only work with
> GENERIC_ATOMIC64
I don't quite understand this dependency on GENERIC_ATOMIC64, or you
mean the opposite? since we currently have:
config IOMMU_PT_AMDV1
tristate "IOMMU page table for 64-bit AMD IOMMU v1"
depends on !GENERIC_ATOMIC64 # for cmpxchg64
And I already have noiommu depends on AMDV1 for mock page tables.
Anyway, this particular build issue can be fixed by adding
IOMMU_SUPPORT. i.e.
diff --git a/drivers/vfio/Kconfig b/drivers/vfio/Kconfig
index 1f3fd7140604..78feca3d0c8b 100644
--- a/drivers/vfio/Kconfig
+++ b/drivers/vfio/Kconfig
@@ -65,6 +65,7 @@ config VFIO_NOIOMMU
select GENERIC_PT
select IOMMU_PT
select IOMMU_PT_AMDV1
+ depends on IOMMU_SUPPORT
help
next prev parent reply other threads:[~2026-03-05 23:26 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-27 17:52 [PATCH 00/11] iommufd: Enable noiommu mode for cdev Jacob Pan
2026-02-27 17:52 ` [PATCH 01/11] iommufd: Support a HWPT without an iommu driver for noiommu Jacob Pan
2026-02-27 17:52 ` [PATCH 02/11] iommufd: Move igroup allocation to a function Jacob Pan
2026-02-27 17:52 ` [PATCH 03/11] iommufd: Allow binding to a noiommu device Jacob Pan
2026-02-27 17:52 ` [PATCH 04/11] iommufd: Add an ioctl IOMMU_IOAS_GET_PA to query PA from IOVA Jacob Pan
2026-02-27 17:52 ` [PATCH 05/11] vfio: Allow null group for noiommu without containers Jacob Pan
2026-02-27 17:52 ` [PATCH 06/11] vfio: Introduce and set noiommu flag on vfio_device Jacob Pan
2026-02-27 17:52 ` [PATCH 07/11] vfio: Update noiommu device detection logic for cdev Jacob Pan
2026-02-27 17:52 ` [PATCH 08/11] vfio: Enable cdev noiommu mode under iommufd Jacob Pan
2026-02-27 22:03 ` kernel test robot
2026-02-28 0:18 ` kernel test robot
2026-02-28 0:35 ` Jason Gunthorpe
2026-03-05 23:26 ` Jacob Pan [this message]
2026-03-05 23:38 ` Jason Gunthorpe
2026-03-12 16:33 ` Jacob Pan
2026-02-28 0:29 ` kernel test robot
2026-02-27 17:52 ` [PATCH 09/11] vfio:selftest: Handle VFIO noiommu cdev Jacob Pan
2026-02-27 17:52 ` [PATCH 10/11] selftests/vfio: Add iommufd noiommu mode selftest for cdev Jacob Pan
2026-02-27 17:52 ` [PATCH 11/11] Doc: Update VFIO NOIOMMU mode Jacob Pan
2026-03-03 0:35 ` [PATCH 00/11] iommufd: Enable noiommu mode for cdev Jason Gunthorpe
2026-03-03 19:13 ` Jacob Pan
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