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    Subject[PATCH kernel v11 10/34] vfio: powerpc/spapr: Disable DMA mappings on disabled container
    Date
    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>
    ---
    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;

    --
    2.4.0.rc3.8.gfb3e7d5


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