[PATCH v2 03/11] iommufd/hw_pagetable: Use domain_alloc_user op for domain allocation

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

This makes IOMMUFD to use iommu_domain_alloc_user() for iommu_domain
creation as IOMMUFD needs to support iommu_domain allocation with
parameters from userspace in nesting support. If the iommu driver
doesn't provide domain_alloc_user callback then it falls back to use
iommu_domain_alloc().

Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Co-developed-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
 drivers/iommu/iommufd/hw_pagetable.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/iommufd/hw_pagetable.c b/drivers/iommu/iommufd/hw_pagetable.c
index cf2c1504e20d..b6323ad9c32d 100644
--- a/drivers/iommu/iommufd/hw_pagetable.c
+++ b/drivers/iommu/iommufd/hw_pagetable.c
@@ -5,6 +5,7 @@
 #include <linux/iommu.h>
 #include <uapi/linux/iommufd.h>
 
+#include "../iommu-priv.h"
 #include "iommufd_private.h"
 
 void iommufd_hw_pagetable_destroy(struct iommufd_object *obj)
@@ -74,6 +75,7 @@ struct iommufd_hw_pagetable *
 iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
 			   struct iommufd_device *idev, bool immediate_attach)
 {
+	const struct iommu_ops *ops = dev_iommu_ops(idev->dev);
 	struct iommufd_hw_pagetable *hwpt;
 	int rc;
 
@@ -88,7 +90,10 @@ iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
 	refcount_inc(&ioas->obj.users);
 	hwpt->ioas = ioas;
 
-	hwpt->domain = iommu_domain_alloc(idev->dev->bus);
+	if (ops->domain_alloc_user)
+		hwpt->domain = ops->domain_alloc_user(idev->dev, NULL, NULL);
+	else
+		hwpt->domain = iommu_domain_alloc(idev->dev->bus);
 	if (!hwpt->domain) {
 		rc = -ENOMEM;
 		goto out_abort;
-- 
2.34.1