[Xen-devel] [PATCH 05 of 16] amd iommu: Enable guest level translation

[Wei Wang <wei.wang2@xxxxxxx>]

# HG changeset patch
# User Wei Wang <wei.wang2@xxxxxxx>
# Date 1324569385 -3600
# Node ID 120144c1fac2dd26926b3b2a6362d30a4029620f
# Parent  33f88c76776c318eea74b8fc1ba467389407ad57
amd iommu: Enable guest level translation.
Similar to nested paging for SVM, IOMMUv2 supports two level translations for
DMA. This patch enables this feature.

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

diff -r 33f88c76776c -r 120144c1fac2 xen/drivers/passthrough/amd/iommu_init.c
--- a/xen/drivers/passthrough/amd/iommu_init.c  Thu Dec 22 16:56:21 2011 +0100
+++ b/xen/drivers/passthrough/amd/iommu_init.c  Thu Dec 22 16:56:25 2011 +0100
@@ -220,6 +220,23 @@ static void set_iommu_translation_contro
     writel(entry, iommu->mmio_base+IOMMU_CONTROL_MMIO_OFFSET);
 }
 
+static void set_iommu_guest_translation_control(struct amd_iommu *iommu,
+                                                int enable)
+{
+    u32 entry;
+
+    entry = readl(iommu->mmio_base + IOMMU_CONTROL_MMIO_OFFSET);
+
+    enable ?
+        iommu_set_bit(&entry, IOMMU_CONTROL_GT_ENABLE_SHIFT):
+        iommu_clear_bit(&entry, IOMMU_CONTROL_GT_ENABLE_SHIFT);
+
+    writel(entry, iommu->mmio_base+IOMMU_CONTROL_MMIO_OFFSET);
+
+    if ( enable )
+        AMD_IOMMU_DEBUG("Guest Translation Enabled.\n");
+}
+
 static void set_iommu_command_buffer_control(struct amd_iommu *iommu,
                                                     int enable)
 {
@@ -655,6 +672,9 @@ static void enable_iommu(struct amd_iomm
     if ( iommu_has_feature(iommu, IOMMU_EXT_FEATURE_PPRSUP_SHIFT) )
         set_iommu_ppr_log_control(iommu, IOMMU_CONTROL_ENABLED);
 
+    if ( iommu_has_feature(iommu, IOMMU_EXT_FEATURE_GTSUP_SHIFT) )
+        set_iommu_guest_translation_control(iommu, IOMMU_CONTROL_ENABLED);
+
     set_iommu_translation_control(iommu, IOMMU_CONTROL_ENABLED);
 
     if ( iommu_has_feature(iommu, IOMMU_EXT_FEATURE_IASUP_SHIFT) )
@@ -996,6 +1016,9 @@ static void disable_iommu(struct amd_iom
     if ( iommu_has_feature(iommu, IOMMU_EXT_FEATURE_PPRSUP_SHIFT) )
         set_iommu_ppr_log_control(iommu, IOMMU_CONTROL_DISABLED);
 
+    if ( iommu_has_feature(iommu, IOMMU_EXT_FEATURE_GTSUP_SHIFT) )
+        set_iommu_guest_translation_control(iommu, IOMMU_CONTROL_DISABLED);
+
     set_iommu_translation_control(iommu, IOMMU_CONTROL_DISABLED);
 
     iommu->enabled = 0;


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