[PATCH 3/4] iommufd: Do not allocate device object if broken_unmanaged_domain

[Nicolin Chen]

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@xxxxxxxxxx>
Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
---
 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