[Xen-changelog] [xen-unstable] AMD IOMMU: If interrupt remapping is disabled, then do not update

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1253258932 -3600
# Node ID 1d503a3e65a0ec513ecebb8481cc44d21642ffe4
# Parent  9c8f9de68a136f457e38d56aaf7c5150aa3b5384
AMD IOMMU: If interrupt remapping is disabled, then do not update
interrupt remapping table with IOAPIC write.

Signed-off-by: Wei Wang <wei.wang2@xxxxxxx>
---
 xen/drivers/passthrough/amd/iommu_intr.c |    6 ++++++
 1 files changed, 6 insertions(+)

diff -r 9c8f9de68a13 -r 1d503a3e65a0 xen/drivers/passthrough/amd/iommu_intr.c
--- a/xen/drivers/passthrough/amd/iommu_intr.c  Fri Sep 18 08:28:20 2009 +0100
+++ b/xen/drivers/passthrough/amd/iommu_intr.c  Fri Sep 18 08:28:52 2009 +0100
@@ -192,6 +192,9 @@ void amd_iommu_ioapic_update_ire(
     *IO_APIC_BASE(apic) = reg;
     *(IO_APIC_BASE(apic)+4) = value;
 
+    if ( !iommu_intremap )
+        return;
+
     /* get device id of ioapic devices */
     bdf = ioapic_bdf[IO_APIC_ID(apic)];
     iommu = find_iommu_for_device(bdf);
@@ -281,6 +284,9 @@ void amd_iommu_msi_msg_update_ire(
     struct pci_dev *pdev = msi_desc->dev;
     struct amd_iommu *iommu = NULL;
 
+    if ( !iommu_intremap )
+        return;
+
     iommu = find_iommu_for_device((pdev->bus << 8) | pdev->devfn);
 
     if ( !iommu )

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