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| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2017-03-24 09:44:06 +0300 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2017-04-11 22:38:46 +0300 |
| commit | 1282ba7fc28dbc66c3f0e4aaafaaa228361d1ae5 (patch) | |
| tree | b5e3008a8b5b2a3abc4216ede9192b1430d66e5c /drivers/tty/n_tracerouter.c | |
| parent | 39da7c509acff13fc8cb12ec1bb20337c988ed36 (diff) | |
| download | linux-1282ba7fc28dbc66c3f0e4aaafaaa228361d1ae5.tar.xz | |
vfio/powerpc/spapr_tce: Enforce IOMMU type compatibility check
The existing SPAPR TCE driver advertises both VFIO_SPAPR_TCE_IOMMU and
VFIO_SPAPR_TCE_v2_IOMMU types to the userspace and the userspace usually
picks the v2.
Normally the userspace would create a container, attach an IOMMU group
to it and only then set the IOMMU type (which would normally be v2).
However a specific IOMMU group may not support v2, in other words
it may not implement set_window/unset_window/take_ownership/
release_ownership and such a group should not be attached to
a v2 container.
This adds extra checks that a new group can do what the selected IOMMU
type suggests. The userspace can then test the return value from
ioctl(VFIO_SET_IOMMU, VFIO_SPAPR_TCE_v2_IOMMU) and try
VFIO_SPAPR_TCE_IOMMU.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/tty/n_tracerouter.c')
0 files changed, 0 insertions, 0 deletions