[PATCH v2 15/24] tools/libxl: Create 'distance-map' node in DomU Device Tree

[Hirokazu Takahashi <taka@xxxxxxxxxxxxx>]

Create the 'distance-map' node in the Device Tree passed to DomU.
This information is retrieved from the virtual NUMA configuration
in the xl domain configuration file.
---
 tools/libs/light/libxl_arm.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/tools/libs/light/libxl_arm.c b/tools/libs/light/libxl_arm.c
index 4b0ed99229..466bee95ad 100644
--- a/tools/libs/light/libxl_arm.c
+++ b/tools/libs/light/libxl_arm.c
@@ -738,6 +738,39 @@ static int make_memory_nodes(libxl__gc *gc, void *fdt,
     return 0;
 }
 
+static int make_numa_distance_map(libxl__gc *gc, void *fdt,
+                                  const libxl_domain_build_info *b_info)
+{
+    int i, j;
+    uint32_t *matrix;
+    int nr_nodes = b_info->num_vnuma_nodes;
+    int idx = 0;
+    int res;
+
+    if (nr_nodes == 0) return 0;
+
+    res = fdt_begin_node(fdt, "distance-map");
+    if (res) return res;
+
+    res = fdt_property_string(fdt, "compatible", "numa-distance-map-v1");
+    if (res) return res;
+
+    matrix = libxl__malloc(gc, sizeof(uint32_t) * nr_nodes * nr_nodes * 3);
+
+    for (i = 0; i < nr_nodes; i++) {
+        for (j = 0; j < nr_nodes; j++) {
+            matrix[idx++] = cpu_to_fdt32(i);
+            matrix[idx++] = cpu_to_fdt32(j);
+            matrix[idx++] = cpu_to_fdt32(b_info->vnuma_nodes[i].distances[j]);
+        }
+    }
+
+    res = fdt_property(fdt, "distance-matrix", matrix, sizeof(uint32_t) * idx);
+    if (res) return res;
+
+    return fdt_end_node(fdt);
+}
+
 static int make_gicv2_node(libxl__gc *gc, void *fdt,
                            uint64_t gicd_base, uint64_t gicd_size,
                            uint64_t gicc_base, uint64_t gicc_size)
@@ -1407,6 +1440,8 @@ next_resize:
 
         FDT( make_memory_nodes(gc, fdt, info, dom) );
 
+        FDT( make_numa_distance_map(gc, fdt, info) );
+
         switch (info->arch_arm.gic_version) {
         case LIBXL_GIC_VERSION_V2:
             FDT( make_gicv2_node(gc, fdt,
-- 
2.43.0