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vfio: platform: support No-IOMMU mode

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The vfio No-IOMMU mode was supported by this
'commit 03a76b60f8 ("vfio: Include No-IOMMU mode")',
but it only support vfio-pci.

Using vfio_iommu_group_get/put, but not iommu_group_get/put,
the platform devices can be exposed to userspace with
CONFIG_VFIO_NOIOMMU and the "enable_unsafe_noiommu_mode"
option enabled.

From 'commit 03a76b60f8 ("vfio: Include No-IOMMU mode")',
"This should make it very clear that this mode is not safe.
Additionally, CAP_SYS_RAWIO privileges are necessary to work
with groups and containers using this mode.  Groups making
use of this support are named /dev/vfio/noiommu-$GROUP and
can only make use of the special VFIO_NOIOMMU_IOMMU for the
container.  Use of this mode, specifically binding a device
without a native IOMMU group to a VFIO bus driver will taint
the kernel and should therefore not be considered supported."

Signed-off-by: Peng Fan <[email protected]>
Cc: Eric Auger <[email protected]>
Cc: Baptiste Reynal <[email protected]>
Cc: Alex Williamson <[email protected]>
Reviewed-by: Eric Auger <[email protected]>
Signed-off-by: Alex Williamson <[email protected]>
This commit is contained in:
Peng Fan 2016-05-23 17:47:30 +08:00 • committed by Alex Williamson
commit 9698cbf0be
1 changed files with 3 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

6
drivers/vfio/platform/vfio_platform_common.c
View file

@ -561,7 +561,7 @@ int vfio_platform_probe_common(struct vfio_platform_device *vdev,
vdev->device = dev;
group = iommu_group_get(dev);
group = vfio_iommu_group_get(dev);
if (!group) {
pr_err("VFIO: No IOMMU group for device %s\n", vdev->name);
return -EINVAL;
@ -569,7 +569,7 @@ int vfio_platform_probe_common(struct vfio_platform_device *vdev,
ret = vfio_add_group_dev(dev, &vfio_platform_ops, vdev);
if (ret) {
iommu_group_put(group);
vfio_iommu_group_put(group, dev);
return ret;
}
@ -589,7 +589,7 @@ struct vfio_platform_device *vfio_platform_remove_common(struct device *dev)
if (vdev) {
vfio_platform_put_reset(vdev);
iommu_group_put(dev->iommu_group);
vfio_iommu_group_put(dev->iommu_group, dev);
}
return vdev;