diff --git a/[refs] b/[refs]
index ba483fe57ced..81444e5ee8e0 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 292827cb164ad00cc7689a21283b1261c0b6daed
+refs/heads/master: 8140a95d228efbcd64d84150e794761a32463947
diff --git a/trunk/drivers/iommu/intel-iommu.c b/trunk/drivers/iommu/intel-iommu.c
index 237ef52c8c76..e5883602cb35 100644
--- a/trunk/drivers/iommu/intel-iommu.c
+++ b/trunk/drivers/iommu/intel-iommu.c
@@ -580,17 +580,18 @@ static void domain_update_iommu_snooping(struct dmar_domain *domain)
 
 static void domain_update_iommu_superpage(struct dmar_domain *domain)
 {
-	int i, mask = 0xf;
+	struct dmar_drhd_unit *drhd;
+	struct intel_iommu *iommu = NULL;
+	int mask = 0xf;
 
 	if (!intel_iommu_superpage) {
 		domain->iommu_superpage = 0;
 		return;
 	}
 
-	domain->iommu_superpage = 4; /* 1TiB */
-
-	for_each_set_bit(i, &domain->iommu_bmp, g_num_of_iommus) {
-		mask |= cap_super_page_val(g_iommus[i]->cap);
+	/* set iommu_superpage to the smallest common denominator */
+	for_each_active_iommu(iommu, drhd) {
+		mask &= cap_super_page_val(iommu->cap);
 		if (!mask) {
 			break;
 		}
@@ -3748,6 +3749,7 @@ static int intel_iommu_domain_init(struct iommu_domain *domain)
 		vm_domain_exit(dmar_domain);
 		return -ENOMEM;
 	}
+	domain_update_iommu_cap(dmar_domain);
 	domain->priv = dmar_domain;
 
 	return 0;