# HG changeset patch
# User Wei Wang <wei.wang2@amd.com>
# Date 1302610857 -3600
# Node ID dbd98ab2f87facba8117bb881fa2ea5dfdb92960
# Parent  697ac895c11c6d5d82524de56796cee98fded2a5
amd iommu: Unmapped interrupt should generate IO page faults.

This helps us to debug interrupt issues.

Signed-off-by: Wei Wang <wei.wang2@amd.com>

Index: xen-4.1.2-testing/xen/drivers/passthrough/amd/iommu_map.c
===================================================================
--- xen-4.1.2-testing.orig/xen/drivers/passthrough/amd/iommu_map.c
+++ xen-4.1.2-testing/xen/drivers/passthrough/amd/iommu_map.c
@@ -327,8 +327,9 @@ void amd_iommu_set_intremap_table(u32 *d
     set_field_in_reg_u32(0xB, entry,
                          IOMMU_DEV_TABLE_INT_TABLE_LENGTH_MASK,
                          IOMMU_DEV_TABLE_INT_TABLE_LENGTH_SHIFT, &entry);
-    /* ignore unmapped interrupts */
-    set_field_in_reg_u32(IOMMU_CONTROL_ENABLED, entry,
+
+    /* unmapped interrupt results io page faults*/
+    set_field_in_reg_u32(IOMMU_CONTROL_DISABLED, entry,
                          IOMMU_DEV_TABLE_INT_TABLE_IGN_UNMAPPED_MASK,
                          IOMMU_DEV_TABLE_INT_TABLE_IGN_UNMAPPED_SHIFT, &entry);
     set_field_in_reg_u32(int_valid ? IOMMU_CONTROL_ENABLED :