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vfio/type1: Add extension to test DMA cache coherence of IOMMU

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Now that the type1 IOMMU backend can support IOMMU_CACHE, we need to
be able to test whether coherency is currently enforced.  Add an
extension for this.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Alex Williamson
2014-02-26 11:38:37 -07:00
parent 1ef3e2bc04
commit aa42931827
2 changed files with 26 additions and 0 deletions
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5
include/uapi/linux/vfio.h
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@@ -24,6 +24,11 @@
#define VFIO_TYPE1_IOMMU 1
#define VFIO_SPAPR_TCE_IOMMU 2
#define VFIO_TYPE1v2_IOMMU 3
/*
* IOMMU enforces DMA cache coherence (ex. PCIe NoSnoop stripping). This
* capability is subject to change as groups are added or removed.
*/
#define VFIO_DMA_CC_IOMMU 4
/*
* The IOCTL interface is designed for extensibility by embedding the