[Xen-changelog] [xen-unstable] amd iommu: Unmapped interrupt should generate IO page faults.

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Wei Wang <wei.wang2@xxxxxxx>
# 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@xxxxxxx>
---


diff -r 697ac895c11c -r dbd98ab2f87f xen/drivers/passthrough/amd/iommu_map.c
--- a/xen/drivers/passthrough/amd/iommu_map.c   Sat Apr 09 12:42:24 2011 +0100
+++ b/xen/drivers/passthrough/amd/iommu_map.c   Tue Apr 12 13:20:57 2011 +0100
@@ -327,8 +327,9 @@
     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 :

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