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authorAlexey Kardashevskiy <aik@ozlabs.ru>2017-03-24 09:44:06 +0300
committerAlex Williamson <alex.williamson@redhat.com>2017-04-11 22:38:46 +0300
commit1282ba7fc28dbc66c3f0e4aaafaaa228361d1ae5 (patch)
treeb5e3008a8b5b2a3abc4216ede9192b1430d66e5c /drivers/vfio/vfio_iommu_spapr_tce.c
parent39da7c509acff13fc8cb12ec1bb20337c988ed36 (diff)
downloadlinux-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/vfio/vfio_iommu_spapr_tce.c')
-rw-r--r--drivers/vfio/vfio_iommu_spapr_tce.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
index cf3de91fbfe7..a7d811524092 100644
--- a/drivers/vfio/vfio_iommu_spapr_tce.c
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -1335,8 +1335,16 @@ static int tce_iommu_attach_group(void *iommu_data,
if (!table_group->ops || !table_group->ops->take_ownership ||
!table_group->ops->release_ownership) {
+ if (container->v2) {
+ ret = -EPERM;
+ goto unlock_exit;
+ }
ret = tce_iommu_take_ownership(container, table_group);
} else {
+ if (!container->v2) {
+ ret = -EPERM;
+ goto unlock_exit;
+ }
ret = tce_iommu_take_ownership_ddw(container, table_group);
if (!tce_groups_attached(container) && !container->tables[0])
container->def_window_pending = true;