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vfio: powerpc/spapr: Disable DMA mappings on disabled container 

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@ozlabs.ru>
[aw: for the vfio related changes]
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Alexey Kardashevskiy 2015-06-05 16:35:02 +10:00 committed by Michael Ellerman
parent 2d270df8f7
commit 3c56e822f8
1 changed files with 6 additions and 0 deletions
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6
drivers/vfio/vfio_iommu_spapr_tce.c
View File

@ -318,6 +318,9 @@ static long tce_iommu_ioctl(void *iommu_data,
struct iommu_table *tbl = container->tbl; struct iommu_table *tbl = container->tbl;
unsigned long tce; unsigned long tce;
if (!container->enabled)
return -EPERM;
if (!tbl) if (!tbl)
return -ENXIO; return -ENXIO;
@ -362,6 +365,9 @@ static long tce_iommu_ioctl(void *iommu_data,
struct vfio_iommu_type1_dma_unmap param; struct vfio_iommu_type1_dma_unmap param;
struct iommu_table *tbl = container->tbl; struct iommu_table *tbl = container->tbl;
if (!container->enabled)
return -EPERM;
if (WARN_ON(!tbl)) if (WARN_ON(!tbl))
return -ENXIO; return -ENXIO;