[PATCH] amd iommu: Do not adjust paging mode for dom0 devices

[Wei Wang2 <wei.wang2@amd.com>]

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Keir
Here is another small patch to fix consistency issue of paging mode when 
return passthru devices back to dom0. In this case, paging mode should not be 
adjusted, since dom0->max_pages = ~0U.
Thanks,
Wei
Signed-off-by: Wei Wang <wei.wang2@amd.com>
--
Advanced Micro Devices GmbH
Sitz: Dornach, Gemeinde Aschheim, 
Landkreis München Registergericht München, 
HRB Nr. 43632
WEEE-Reg-Nr: DE 12919551
Geschäftsführer:
Alberto Bozzo, Andrew Bowd

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diff -r a9ba2e80765f xen/drivers/passthrough/amd/pci_amd_iommu.c
--- a/xen/drivers/passthrough/amd/pci_amd_iommu.c	Tue Feb 01 17:30:54 2011 +0100
+++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c	Tue Feb 01 17:32:07 2011 +0100
@@ -298,7 +298,7 @@ static int reassign_device( struct domai
     list_move(&pdev->domain_list, &target->arch.pdev_list);
     pdev->domain = target;
 
-    if ( target->max_pages > 0 )
+    if ( target != dom0 && target->max_pages > 0 )
         t->paging_mode = get_paging_mode(target->max_pages);
 
     /* IO page tables might be destroyed after pci-detach the last device

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