From: Jacob Pan Date: Fri, 13 Feb 2026 18:36:36 +0000 (-0800) Subject: iommufd: vfio compatibility extension check for noiommu mode X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7147ec874ea08c322d779d8eba28946e294ed1f3;p=thirdparty%2Fkernel%2Flinux.git 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: d624d6652a65 ("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 Signed-off-by: Jason Gunthorpe --- diff --git a/drivers/iommu/iommufd/vfio_compat.c b/drivers/iommu/iommufd/vfio_compat.c index a258ee2f4579..acb48cdd3b00 100644 --- a/drivers/iommu/iommufd/vfio_compat.c +++ b/drivers/iommu/iommufd/vfio_compat.c @@ -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);