[Xen-changelog] [xen-unstable] amd iommu: Enable FC bit in iommu host level PTE

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Wei Wang <wei.wang2@xxxxxxx>
# Date 1326372868 -3600
# Node ID 9db6fe19dd04d2ac33eebed528058811f1cf0183
# Parent  d4daaab0164306859e21b7a931a0f5eaab8da24c
amd iommu: Enable FC bit in iommu host level PTE

Signed-off-by: Wei Wang <wei.wang2@xxxxxxx>
Committed-by: Jan Beulich <jbeulich@xxxxxxxx>
---


diff -r d4daaab01643 -r 9db6fe19dd04 xen/drivers/passthrough/amd/iommu_map.c
--- a/xen/drivers/passthrough/amd/iommu_map.c   Thu Jan 12 13:53:57 2012 +0100
+++ b/xen/drivers/passthrough/amd/iommu_map.c   Thu Jan 12 13:54:28 2012 +0100
@@ -83,6 +83,13 @@
     set_field_in_reg_u32(ir, entry,
                          IOMMU_PDE_IO_READ_PERMISSION_MASK,
                          IOMMU_PDE_IO_READ_PERMISSION_SHIFT, &entry);
+
+    /* FC bit should be enabled in PTE, this helps to solve potential
+     * issues with ATS devices
+     */
+    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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