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@nvidia.com Signed-off-by: Nicolin Chen nicolinc@nvidia.com --- include/linux/iommufd.h | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h index 55054fbc793c..5c13c35952d8 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 * @free: Free all driver-specific parts of an iommufd_viommu. The memory of the * vIOMMU will be free-ed by iommufd core after calling this free op. + * @domain_alloc_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 (*free)(struct iommufd_viommu *viommu); + struct iommu_domain *(*domain_alloc_nested)( + struct iommufd_viommu *viommu, + const struct iommu_user_data *user_data); };
#if IS_ENABLED(CONFIG_IOMMUFD)