Allow IOMMU driver to use a vIOMMU object that holds a nesting parent
hwpt/domain to allocate a nested domain.
Suggested-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
---
include/linux/iommufd.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h
index 457e763e8b63..f03c75410938 100644
--- a/include/linux/iommufd.h
+++ b/include/linux/iommufd.h
@@ -14,6 +14,7 @@
struct device;
struct file;
struct iommu_group;
+struct iommu_user_data;
struct iommufd_access;
struct iommufd_ctx;
struct iommufd_device;
@@ -95,9 +96,17 @@ struct iommufd_viommu {
* struct iommufd_viommu_ops - vIOMMU specific operations
* @destroy: Clean up all driver-specific parts of an iommufd_viommu. The memory
* of the vIOMMU will be free-ed by iommufd core after calling this op
+ * @alloc_domain_nested: Allocate a IOMMU_DOMAIN_NESTED on a vIOMMU that holds a
+ * nesting parent domain (IOMMU_DOMAIN_PAGING). @user_data
+ * must be defined in include/uapi/linux/iommufd.h.
+ * It must fully initialize the new iommu_domain before
+ * returning. Upon failure, ERR_PTR must be returned.
*/
struct iommufd_viommu_ops {
void (*destroy)(struct iommufd_viommu *viommu);
+ struct iommu_domain *(*alloc_domain_nested)(
+ struct iommufd_viommu *viommu, u32 flags,
+ const struct iommu_user_data *user_data);
};
#if IS_ENABLED(CONFIG_IOMMUFD)
--
2.43.0
