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Subject[PATCH 3/4] iommufd: Do not allocate device object if broken_unmanaged_domain
Date
Add a sanity of the broken_unmanaged_domain flag to reject the use of
iommufd in the early stage, if the flag is set by the iommu driver.

Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
---
drivers/iommu/iommufd/device.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c
index d81f93a321af..41b55615a693 100644
--- a/drivers/iommu/iommufd/device.c
+++ b/drivers/iommu/iommufd/device.c
@@ -73,6 +73,9 @@ struct iommufd_device *iommufd_device_bind(struct iommufd_ctx *ictx,
if (!device_iommu_capable(dev, IOMMU_CAP_CACHE_COHERENCY))
return ERR_PTR(-EINVAL);

+ if (!device_iommu_unmanaged_supported(dev))
+ return ERR_PTR(-EINVAL);
+
group = iommu_group_get(dev);
if (!group)
return ERR_PTR(-ENODEV);
--
2.39.1
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