iommu/vt-d: Make identity_domain_set_dev_pasid() to handle domain replacement

Let identity_domain_set_dev_pasid() call the pasid replace helpers hence
be able to do domain replacement.

Reviewed-by: Lu Baolu <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
Signed-off-by: Yi Liu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lu Baolu <[email protected]>
Signed-off-by: Joerg Roedel <[email protected]>

Author: yiliu1765

drivers/iommu/intel/iommu.c

@@ -1778,6 +1778,17 @@ static int domain_setup_second_level(struct intel_iommu *iommu,
 						pasid);
 }
 
+static int domain_setup_passthrough(struct intel_iommu *iommu,
+				    struct device *dev, ioasid_t pasid,
+				    struct iommu_domain *old)
+{
+	if (!old)
+		return intel_pasid_setup_pass_through(iommu, dev, pasid);
+	return intel_pasid_replace_pass_through(iommu, dev,
+						iommu_domain_did(old, iommu),
+						pasid);
+}
+
 static int domain_setup_first_level(struct intel_iommu *iommu,
 				    struct dmar_domain *domain,
 				    struct device *dev,
@@ -4423,11 +4434,17 @@ static int identity_domain_set_dev_pasid(struct iommu_domain *domain,
 {
 	struct device_domain_info *info = dev_iommu_priv_get(dev);
 	struct intel_iommu *iommu = info->iommu;
+	int ret;
 
 	if (!pasid_supported(iommu) || dev_is_real_dma_subdevice(dev))
 		return -EOPNOTSUPP;
 
-	return intel_pasid_setup_pass_through(iommu, dev, pasid);
+	ret = domain_setup_passthrough(iommu, dev, pasid, old);
+	if (ret)
+		return ret;
+
+	domain_remove_dev_pasid(old, dev, pasid);
+	return 0;
 }
 
 static struct iommu_domain identity_domain = {