[Xen-devel] [PATCH 10 of 16] amd iommu: Enable FC bit in iommu host level PTE

[Wei Wang <wei.wang2@xxxxxxx>]

# HG changeset patch
# User Wei Wang <wei.wang2@xxxxxxx>
# Date 1324569401 -3600
# Node ID 30b1f434160d989be5e0bb6c6956bb7e3985db59
# Parent  dd808bdd61c581b041d5b7e816b18674de51da6f
amd iommu: Enable FC bit in iommu host level PTE

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

diff -r dd808bdd61c5 -r 30b1f434160d xen/drivers/passthrough/amd/iommu_map.c
--- a/xen/drivers/passthrough/amd/iommu_map.c   Thu Dec 22 16:56:38 2011 +0100
+++ b/xen/drivers/passthrough/amd/iommu_map.c   Thu Dec 22 16:56:41 2011 +0100
@@ -83,6 +83,11 @@ static bool_t set_iommu_pde_present(u32 
     set_field_in_reg_u32(ir, entry,
                          IOMMU_PDE_IO_READ_PERMISSION_MASK,
                          IOMMU_PDE_IO_READ_PERMISSION_SHIFT, &entry);
+
+    /* IOMMUv2 needs FC bit enabled  */
+    if ( next_level == IOMMU_PAGING_MODE_LEVEL_0 )
+        set_field_in_reg_u32(IOMMU_CONTROL_ENABLED, entry,
+                             IOMMU_PTE_FC_MASK, IOMMU_PTE_FC_SHIFT, &entry);
     pde[1] = entry;
 
     /* mark next level as 'present' */


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