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Message-Id: <1431358763-24371-11-git-send-email-aik@ozlabs.ru>
Date: Tue, 12 May 2015 01:38:59 +1000
From: Alexey Kardashevskiy <aik@...abs.ru>
To: linuxppc-dev@...ts.ozlabs.org
Cc: Alexey Kardashevskiy <aik@...abs.ru>,
David Gibson <david@...son.dropbear.id.au>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Alex Williamson <alex.williamson@...hat.com>,
Gavin Shan <gwshan@...ux.vnet.ibm.com>,
Wei Yang <weiyang@...ux.vnet.ibm.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH kernel v10 10/34] 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@...abs.ru>
[aw: for the vfio related changes]
Acked-by: Alex Williamson <alex.williamson@...hat.com>
Reviewed-by: David Gibson <david@...son.dropbear.id.au>
---
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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