[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 1323875775 -3600
# Node ID 001681ff1a0c09c4d04fd8bd45e8d26805686246
# Parent  f33af4d61321d074a4c624d909204fce5945f61b
amd iommu: Enable FC bit in iommu host level PTE

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

diff -r f33af4d61321 -r 001681ff1a0c xen/drivers/passthrough/amd/iommu_map.c
--- a/xen/drivers/passthrough/amd/iommu_map.c   Wed Dec 14 16:16:14 2011 +0100
+++ b/xen/drivers/passthrough/amd/iommu_map.c   Wed Dec 14 16:16:15 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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