[Qemu-devel] [RFC 09/12] pc: Set fw_cfg data based on APIC ID calculation

[Eduardo Habkost <ehabkost@redhat.com>]

This changes FW_CFG_MAX_CPUS and FW_CFG_NUMA to use apic_id_for_cpu(),
so the NUMA table can be based on the APIC IDs, instead of CPU index
(SeaBIOS knows nothing about CPU indexes, just APIC IDs).

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
Changes v2:
 - Get PC object as argument
 - Add more detailed comments explaining the reason for FW_CFG_MAX_CPUS
   not being simply 'max_cpus'

Changes v3:
 - Use PCInitArgs instead of PC object

Changes v4:
 - Don't use PCInitArgs, just add the necessary data for apic_id_limit()
   as argument
 - Rename function to pc_apic_id_limit()
 - Rename max_apic_id to apic_id_limit
---
 hw/pc.c | 44 +++++++++++++++++++++++++++++++++++++-------
 1 file changed, 37 insertions(+), 7 deletions(-)

diff --git a/hw/pc.c b/hw/pc.c
index beb816b..38ae807 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -541,6 +541,18 @@ int e820_add_entry(uint64_t address, uint64_t length, uint32_t type)
     return index;
 }
 
+/* Calculates the limit to CPU APIC ID values
+ *
+ * This function returns the limit for the APIC ID value, so that all
+ * CPU APIC IDs are < pc_apic_id_limit().
+ *
+ * This is used for FW_CFG_MAX_CPUS. See comments on bochs_bios_init().
+ */
+static unsigned int pc_apic_id_limit(unsigned int max_cpus)
+{
+    return apic_id_for_cpu(max_cpus - 1) + 1;
+}
+
 static void *bochs_bios_init(void)
 {
     void *fw_cfg;
@@ -548,9 +560,24 @@ static void *bochs_bios_init(void)
     size_t smbios_len;
     uint64_t *numa_fw_cfg;
     int i, j;
+    unsigned int apic_id_limit = pc_apic_id_limit(max_cpus);
 
     fw_cfg = fw_cfg_init(BIOS_CFG_IOPORT, BIOS_CFG_IOPORT + 1, 0, 0);
-    fw_cfg_add_i16(fw_cfg, FW_CFG_MAX_CPUS, (uint16_t)max_cpus);
+    /* FW_CFG_MAX_CPUS is a bit confusing/problematic on x86:
+     *
+     * SeaBIOS needs FW_CFG_MAX_CPUS for CPU hotplug, but the CPU hotplug
+     * QEMU<->SeaBIOS interface is not based on the "CPU index", but on the APIC
+     * ID of hotplugged CPUs[1]. This means that FW_CFG_MAX_CPUS is not the
+     * "maximum number of CPUs", but the "limit to the APIC ID values SeaBIOS
+     * may see".
+     *
+     * So, this means we must not use max_cpus, here, but the maximum possible
+     * APIC ID value, plus one.
+     *
+     * [1] The only kind of "CPU identifier" used between SeaBIOS and QEMU is
+     *     the APIC ID, not the "CPU index"
+     */
+    fw_cfg_add_i16(fw_cfg, FW_CFG_MAX_CPUS, (uint16_t)apic_id_limit);
     fw_cfg_add_i32(fw_cfg, FW_CFG_ID, 1);
     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,
@@ -570,21 +597,24 @@ static void *bochs_bios_init(void)
      * of nodes, one word for each VCPU->node and one word for each node to
      * hold the amount of memory.
      */
-    numa_fw_cfg = g_malloc0((1 + max_cpus + nb_numa_nodes) * 8);
+    numa_fw_cfg = g_malloc0((1 + apic_id_limit + nb_numa_nodes) * 8);
     numa_fw_cfg[0] = cpu_to_le64(nb_numa_nodes);
-    for (i = 0; i < max_cpus; i++) {
+    unsigned int cpu_idx;
+    for (cpu_idx = 0; cpu_idx < max_cpus; cpu_idx++) {
+        unsigned int apic_id = apic_id_for_cpu(cpu_idx);
+        assert(apic_id < apic_id_limit);
         for (j = 0; j < nb_numa_nodes; j++) {
-            if (test_bit(i, node_cpumask[j])) {
-                numa_fw_cfg[i + 1] = cpu_to_le64(j);
+            if (test_bit(cpu_idx, node_cpumask[j])) {
+                numa_fw_cfg[apic_id + 1] = cpu_to_le64(j);
                 break;
             }
         }
     }
     for (i = 0; i < nb_numa_nodes; i++) {
-        numa_fw_cfg[max_cpus + 1 + i] = cpu_to_le64(node_mem[i]);
+        numa_fw_cfg[apic_id_limit + 1 + i] = cpu_to_le64(node_mem[i]);
     }
     fw_cfg_add_bytes(fw_cfg, FW_CFG_NUMA, (uint8_t *)numa_fw_cfg,
-                     (1 + max_cpus + nb_numa_nodes) * 8);
+                     (1 + apic_id_limit + nb_numa_nodes) * 8);
 
     return fw_cfg;
 }
-- 
1.7.11.7