[PATCH kernel v10 10/34] vfio: powerpc/spapr: Disable DMA mappings on disabled container

From: Alexey Kardashevskiy
Date: Mon May 11 2015 - 11:41:18 EST

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@xxxxxxxxx>
[aw: for the vfio related changes]
Acked-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
Reviewed-by: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
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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