[PATCH kernel v11 10/34] vfio: powerpc/spapr: Disable DMA mappings on disabled container

Alexey Kardashevskiy aik at ozlabs.ru
Fri May 29 18:44:34 AEST 2015

At the moment DMA map/unmap requests are handled irrespective to
the container's state. This allows the user space to pin memory which
it might not be allowed to pin.

This adds checks to MAP/UNMAP that the container is enabled, otherwise
-EPERM is returned.

Signed-off-by: Alexey Kardashevskiy <aik at ozlabs.ru>
[aw: for the vfio related changes]
Acked-by: Alex Williamson <alex.williamson at redhat.com>
Reviewed-by: David Gibson <david at gibson.dropbear.id.au>
Reviewed-by: Gavin Shan <gwshan at linux.vnet.ibm.com>
 drivers/vfio/vfio_iommu_spapr_tce.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
index 40583f9..e21479c 100644
--- a/drivers/vfio/vfio_iommu_spapr_tce.c
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -318,6 +318,9 @@ static long tce_iommu_ioctl(void *iommu_data,
 		struct iommu_table *tbl = container->tbl;
 		unsigned long tce;
+		if (!container->enabled)
+			return -EPERM;
 		if (!tbl)
 			return -ENXIO;
@@ -362,6 +365,9 @@ static long tce_iommu_ioctl(void *iommu_data,
 		struct vfio_iommu_type1_dma_unmap param;
 		struct iommu_table *tbl = container->tbl;
+		if (!container->enabled)
+			return -EPERM;
 		if (WARN_ON(!tbl))
 			return -ENXIO;

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