Commit 3c56e822 authored Jun 05, 2015 by Alexey Kardashevskiy Committed by Michael Ellerman Jun 11, 2015

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>

parent 2d270df8

drivers/vfio/vfio_iommu_spapr_tce.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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;