iommu/vt-d: Use ops->blocked_domain

Trivially migrate to the ops->blocked_domain for the existing global
static.

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Acked-by: Sven Peter <sven@svenpeter.dev>
Link: https://lore.kernel.org/r/3-v2-bff223cf6409+282-dart_paging_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Author: jgunthorpe

drivers/iommu/intel/iommu.c

@@ -4041,8 +4041,6 @@ static struct iommu_domain *intel_iommu_domain_alloc(unsigned type)
 	struct iommu_domain *domain;
 
 	switch (type) {
-	case IOMMU_DOMAIN_BLOCKED:
-		return &blocking_domain;
 	case IOMMU_DOMAIN_DMA:
 	case IOMMU_DOMAIN_UNMANAGED:
 		dmar_domain = alloc_domain(type);
@@ -4804,6 +4802,7 @@ static void *intel_iommu_hw_info(struct device *dev, u32 *length, u32 *type)
 }
 
 const struct iommu_ops intel_iommu_ops = {
+	.blocked_domain		= &blocking_domain,
 	.capable		= intel_iommu_capable,
 	.hw_info		= intel_iommu_hw_info,
 	.domain_alloc		= intel_iommu_domain_alloc,