iommu/vt-d: Add PASID_FLAG_FL5LP for first-level pasid setup

Current intel_pasid_setup_first_level() use 5-level paging for
first level translation if CPUs use 5-level paging mode too.
This makes sense for SVA usages since the page table is shared
between CPUs and IOMMUs. But it makes no sense if we only want
to use first level for IOVA translation. Add PASID_FLAG_FL5LP
bit in the flags which indicates whether the 5-level paging
mode should be used.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/intel-pasid.c

@@ -477,18 +477,15 @@ int intel_pasid_setup_first_level(struct intel_iommu *iommu,
 		pasid_set_sre(pte);
 	}
 
-#ifdef CONFIG_X86
-	/* Both CPU and IOMMU paging mode need to match */
-	if (cpu_feature_enabled(X86_FEATURE_LA57)) {
+	if (flags & PASID_FLAG_FL5LP) {
 		if (cap_5lp_support(iommu->cap)) {
 			pasid_set_flpm(pte, 1);
 		} else {
-			pr_err("VT-d has no 5-level paging support for CPU\n");
+			pr_err("No 5-level paging support for first-level\n");
 			pasid_clear_entry(pte);
 			return -EINVAL;
 		}
 	}
-#endif /* CONFIG_X86 */
 
 	pasid_set_domain_id(pte, did);
 	pasid_set_address_width(pte, iommu->agaw);

drivers/iommu/intel-pasid.h

@@ -37,6 +37,12 @@
  */
 #define PASID_FLAG_SUPERVISOR_MODE	BIT(0)
 
+/*
+ * The PASID_FLAG_FL5LP flag Indicates using 5-level paging for first-
+ * level translation, otherwise, 4-level paging will be used.
+ */
+#define PASID_FLAG_FL5LP		BIT(1)
+
 struct pasid_dir_entry {
 	u64 val;
 };

drivers/iommu/intel-svm.c

@@ -364,7 +364,9 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
 		ret = intel_pasid_setup_first_level(iommu, dev,
 				mm ? mm->pgd : init_mm.pgd,
 				svm->pasid, FLPT_DEFAULT_DID,
-				mm ? 0 : PASID_FLAG_SUPERVISOR_MODE);
+				(mm ? 0 : PASID_FLAG_SUPERVISOR_MODE) |
+				(cpu_feature_enabled(X86_FEATURE_LA57) ?
+				 PASID_FLAG_FL5LP : 0));
 		spin_unlock(&iommu->lock);
 		if (ret) {
 			if (mm)
@@ -385,7 +387,9 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
 		ret = intel_pasid_setup_first_level(iommu, dev,
 						mm ? mm->pgd : init_mm.pgd,
 						svm->pasid, FLPT_DEFAULT_DID,
-						mm ? 0 : PASID_FLAG_SUPERVISOR_MODE);
+						(mm ? 0 : PASID_FLAG_SUPERVISOR_MODE) |
+						(cpu_feature_enabled(X86_FEATURE_LA57) ?
+						PASID_FLAG_FL5LP : 0));
 		spin_unlock(&iommu->lock);
 		if (ret) {
 			kfree(sdev);