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[Qemu-devel] [PATCH 3/4] sending NUMA topology to BIOS


From: Andre Przywara
Subject: [Qemu-devel] [PATCH 3/4] sending NUMA topology to BIOS
Date: Tue, 31 Mar 2009 15:28:56 +0200

From: Andre Przywara <address@hidden>


Signed-off-by: Andre Przywara <address@hidden>
---
 hw/fw_cfg.h |    1 +
 hw/pc.c     |   22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/hw/fw_cfg.h b/hw/fw_cfg.h
index 41a3dd0..f616ed2 100644
--- a/hw/fw_cfg.h
+++ b/hw/fw_cfg.h
@@ -14,6 +14,7 @@
 #define FW_CFG_INITRD_ADDR      0x0a
 #define FW_CFG_INITRD_SIZE      0x0b
 #define FW_CFG_BOOT_DEVICE      0x0c
+#define FW_CFG_NUMA             0x0d
 #define FW_CFG_MAX_ENTRY        0x10
 
 #define FW_CFG_WRITE_CHANNEL    0x4000
diff --git a/hw/pc.c b/hw/pc.c
index f9cfd1f..5c066b8 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -425,6 +425,8 @@ static void bochs_bios_write(void *opaque, uint32_t addr, 
uint32_t val)
 static void bochs_bios_init(void)
 {
     void *fw_cfg;
+    uint64_t *numa_fw_cfg;
+    int i, j;
 
     register_ioport_write(0x400, 1, 2, bochs_bios_write, NULL);
     register_ioport_write(0x401, 1, 2, bochs_bios_write, NULL);
@@ -442,6 +444,26 @@ static void bochs_bios_init(void)
     fw_cfg_add_i64(fw_cfg, FW_CFG_RAM_SIZE, (uint64_t)ram_size);
     fw_cfg_add_bytes(fw_cfg, FW_CFG_ACPI_TABLES, (uint8_t *)acpi_tables,
                      acpi_tables_len);
+
+    /* allocate memory for the NUMA channel: one (64bit) word for the number
+     * of nodes, one word for each VCPU->node and one word for each node to
+     * hold the amount of memory.
+     */
+    numa_fw_cfg = qemu_mallocz ((1 + smp_cpus + nb_numa_nodes) * 8);
+    numa_fw_cfg[0] = nb_numa_nodes;
+    for (i = 0; i < smp_cpus; i++) {
+        for (j = 0; j < nb_numa_nodes; j++) {
+            if (node_cpumask[j] & (1 << i)) {
+                numa_fw_cfg[i + 1] = j;
+                break;
+            }
+        }
+    }
+    for (i = 0; i < nb_numa_nodes; i++) {
+        numa_fw_cfg[smp_cpus + 1 + i] = node_mem[i];
+    }
+    fw_cfg_add_bytes(fw_cfg, FW_CFG_NUMA, (uint8_t*)numa_fw_cfg,
+                     (1 + smp_cpus + nb_numa_nodes) * 8);
 }
 
 /* Generate an initial boot sector which sets state and jump to
-- 
1.6.1.3






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