Commit 7147ec87 authored by Jacob Pan's avatar Jacob Pan Committed by Jason Gunthorpe
Browse files

iommufd: vfio compatibility extension check for noiommu mode 

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: d624d665 ("iommufd: vfio container FD ioctl compatibility")
Link: https://patch.msgid.link/r/20260213183636.3340-1-jacob.pan@linux.microsoft.com


Signed-off-by: default avatarJacob Pan <jacob.pan@linux.microsoft.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@nvidia.com>
parent 46a93917

drivers/iommu/iommufd/vfio_compat.c

+1 −1
Original line number Diff line number Diff line
@@ -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);