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iommufd: vfio compatibility extension check for noiommu mode

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VFIO_CHECK_EXTENSION should return false for TYPE1_IOMMU variants when
in NO-IOMMU mode and IOMMUFD compat container is set. This change makes
the behavior match VFIO_CONTAINER in noiommu mode. It also prevents
userspace from incorrectly attempting to use TYPE1 IOMMU operations
in a no-iommu context.

Fixes: d624d6652a ("iommufd: vfio container FD ioctl compatibility")
Link: https://patch.msgid.link/r/20260213183636.3340-1-jacob.pan@linux.microsoft.com
Signed-off-by: Jacob Pan <jacob.pan@linux.microsoft.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Jacob Pan
2026-03-02 20:29:01 -04:00
committed by Jason Gunthorpe
parent 46a93917bf
commit 7147ec874e
1 changed files with 1 additions and 1 deletions
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drivers/iommu/iommufd/vfio_compat.c
+1 -1
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@@ -283,7 +283,7 @@ static int iommufd_vfio_check_extension(struct iommufd_ctx *ictx,
case VFIO_TYPE1_IOMMU:
case VFIO_TYPE1v2_IOMMU:
case VFIO_UNMAP_ALL:
return 1;
return !ictx->no_iommu_mode;
case VFIO_NOIOMMU_IOMMU:
return IS_ENABLED(CONFIG_VFIO_NOIOMMU);