[PATCH v4 03/17] iommufd: Unite all kernel-managed members into a struct

[Yi Liu <yi.l.liu@intel.com>]

From: Nicolin Chen <nicolinc@nvidia.com>

The struct iommufd_hw_pagetable has been representing a kernel-managed
HWPT, yet soon will be reused to represent a user-managed HWPT. These
two types of HWPTs has the same IOMMUFD object type and an iommu_domain
object, but have quite different attributes/members.

Add a union in struct iommufd_hw_pagetable and group all the existing
kernel-managed members. One of the following patches will add another
struct for user-managed members.

Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
 drivers/iommu/iommufd/iommufd_private.h | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h
index 3064997a0181..947a797536e3 100644
--- a/drivers/iommu/iommufd/iommufd_private.h
+++ b/drivers/iommu/iommufd/iommufd_private.h
@@ -231,13 +231,18 @@ int iommufd_vfio_ioas(struct iommufd_ucmd *ucmd);
  */
 struct iommufd_hw_pagetable {
 	struct iommufd_object obj;
-	struct iommufd_ioas *ioas;
 	struct iommu_domain *domain;
-	bool auto_domain : 1;
-	bool enforce_cache_coherency : 1;
-	bool msi_cookie : 1;
-	/* Head at iommufd_ioas::hwpt_list */
-	struct list_head hwpt_item;
+
+	union {
+		struct { /* kernel-managed */
+			struct iommufd_ioas *ioas;
+			bool auto_domain : 1;
+			bool enforce_cache_coherency : 1;
+			bool msi_cookie : 1;
+			/* Head at iommufd_ioas::hwpt_list */
+			struct list_head hwpt_item;
+		};
+	};
 };
 
 struct iommufd_hw_pagetable *
-- 
2.34.1