[Qemu-devel] [PATCH 8/9] pc: move apic_id_limit to PCMachineState

[Igor Mammedov <imammedo@redhat.com>]

yet another cleanup that replaces multiple apic_id_limit
variables that were initialized at differnt places with
a one initialization at pc_cpus_init() time and letting
other code to just read it. That also allows to reduce
number of a function arguments where it takes
MachineState as an argument.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 hw/i386/acpi-build.c | 14 +++++++-------
 hw/i386/pc.c         | 49 +++++++++++++++++++++----------------------------
 include/hw/i386/pc.h |  4 +++-
 3 files changed, 31 insertions(+), 36 deletions(-)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 921830e..d6cd06a 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -937,7 +937,7 @@ static Aml *build_crs(PCIHostState *host,
     return crs;
 }
 
-static void build_processor_devices(Aml *sb_scope, unsigned acpi_cpus,
+static void build_processor_devices(Aml *sb_scope,
                                     AcpiPmInfo *pm, MachineState *machine)
 {
     int i;
@@ -948,12 +948,13 @@ static void build_processor_devices(Aml *sb_scope, unsigned acpi_cpus,
     Aml *ifctx;
     Aml *method;
     MachineClass *mc = MACHINE_GET_CLASS(machine);
+    PCMachineState *pcms = PC_MACHINE(machine);
     GArray *apic_id_list = mc->possible_cpu_arch_ids();
 
     /* The current AML generator can cover the APIC ID range [0..255],
      * inclusive, for VCPU hotplug. */
     QEMU_BUILD_BUG_ON(ACPI_CPU_HOTPLUG_ID_LIMIT > 256);
-    g_assert(acpi_cpus <= ACPI_CPU_HOTPLUG_ID_LIMIT);
+    g_assert(pcms->apic_id_limit <= ACPI_CPU_HOTPLUG_ID_LIMIT);
 
     /* create PCI0.PRES device and its _CRS to reserve CPU hotplug MMIO */
     dev = aml_device("PCI0." stringify(CPU_HOTPLUG_RESOURCE_DEVICE));
@@ -1029,10 +1030,10 @@ static void build_processor_devices(Aml *sb_scope, unsigned acpi_cpus,
      * ith up to 255 elements. Windows guests up to win2k8 fail when
      * VarPackageOp is used.
      */
-    pkg = acpi_cpus <= 255 ? aml_package(acpi_cpus) :
-                             aml_varpackage(acpi_cpus);
+    pkg = pcms->apic_id_limit <= 255 ? aml_package(pcms->apic_id_limit) :
+                                       aml_varpackage(pcms->apic_id_limit);
 
-    for (i = 0; i < acpi_cpus; i++) {
+    for (i = 0; i < pcms->apic_id_limit; i++) {
         uint8_t b = qemu_get_cpu_by_arch_id(i) ? 0x01 : 0x00;
         aml_append(pkg, aml_int(b));
     }
@@ -2233,8 +2234,7 @@ build_dsdt(GArray *table_data, GArray *linker,
 
     sb_scope = aml_scope("\\_SB");
     {
-        build_processor_devices(sb_scope, guest_info->apic_id_limit, pm,
-                                machine);
+        build_processor_devices(sb_scope, pm, machine);
 
         build_memory_devices(sb_scope, nr_mem, pm->mem_hp_io_base,
                              pm->mem_hp_io_len);
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 2fd8fc8..61fbb11 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -700,18 +700,6 @@ static uint32_t x86_cpu_apic_id_from_index(unsigned int cpu_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 x86_cpu_apic_id_from_index(max_cpus - 1) + 1;
-}
-
 static void pc_build_smbios(FWCfgState *fw_cfg)
 {
     uint8_t *smbios_tables, *smbios_anchor;
@@ -749,12 +737,11 @@ static void pc_build_smbios(FWCfgState *fw_cfg)
     }
 }
 
-static FWCfgState *bochs_bios_init(AddressSpace *as)
+static FWCfgState *bochs_bios_init(AddressSpace *as, PCMachineState *pcms)
 {
     FWCfgState *fw_cfg;
     uint64_t *numa_fw_cfg;
     int i, j;
-    unsigned int apic_id_limit = pc_apic_id_limit(max_cpus);
 
     fw_cfg = fw_cfg_init_io_dma(BIOS_CFG_IOPORT, BIOS_CFG_IOPORT + 4, as);
 
@@ -772,7 +759,7 @@ static FWCfgState *bochs_bios_init(AddressSpace *as)
      * [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_i16(fw_cfg, FW_CFG_MAX_CPUS, (uint16_t)pcms->apic_id_limit);
     fw_cfg_add_i64(fw_cfg, FW_CFG_RAM_SIZE, (uint64_t)ram_size);
     fw_cfg_add_bytes(fw_cfg, FW_CFG_ACPI_TABLES,
                      acpi_tables, acpi_tables_len);
@@ -790,11 +777,11 @@ static FWCfgState *bochs_bios_init(AddressSpace *as)
      * of nodes, one word for each VCPU->node and one word for each node to
      * hold the amount of memory.
      */
-    numa_fw_cfg = g_new0(uint64_t, 1 + apic_id_limit + nb_numa_nodes);
+    numa_fw_cfg = g_new0(uint64_t, 1 + pcms->apic_id_limit + nb_numa_nodes);
     numa_fw_cfg[0] = cpu_to_le64(nb_numa_nodes);
     for (i = 0; i < max_cpus; i++) {
         unsigned int apic_id = x86_cpu_apic_id_from_index(i);
-        assert(apic_id < apic_id_limit);
+        assert(apic_id < pcms->apic_id_limit);
         for (j = 0; j < nb_numa_nodes; j++) {
             if (test_bit(i, numa_info[j].node_cpu)) {
                 numa_fw_cfg[apic_id + 1] = cpu_to_le64(j);
@@ -803,10 +790,11 @@ static FWCfgState *bochs_bios_init(AddressSpace *as)
         }
     }
     for (i = 0; i < nb_numa_nodes; i++) {
-        numa_fw_cfg[apic_id_limit + 1 + i] = cpu_to_le64(numa_info[i].node_mem);
+        numa_fw_cfg[pcms->apic_id_limit + 1 + i] =
+            cpu_to_le64(numa_info[i].node_mem);
     }
     fw_cfg_add_bytes(fw_cfg, FW_CFG_NUMA, numa_fw_cfg,
-                     (1 + apic_id_limit + nb_numa_nodes) *
+                     (1 + pcms->apic_id_limit + nb_numa_nodes) *
                      sizeof(*numa_fw_cfg));
 
     return fw_cfg;
@@ -1120,7 +1108,14 @@ void pc_cpus_init(PCMachineState *pcms)
     int i;
     X86CPU *cpu = NULL;
     MachineState *machine = MACHINE(pcms);
-    unsigned long apic_id_limit;
+
+    /* Calculates the limit to CPU APIC ID values so that all
+     * CPU APIC IDs are < pcms->apic_id_limit.
+     *
+     * This is used for FW_CFG_MAX_CPUS. See comments on bochs_bios_init().
+     * and bitmap based ACPI CPU hotplug interface
+     */
+    pcms->apic_id_limit = x86_cpu_apic_id_from_index(max_cpus - 1) + 1;
 
     /* init CPUs */
     if (machine->cpu_model == NULL) {
@@ -1131,10 +1126,9 @@ void pc_cpus_init(PCMachineState *pcms)
 #endif
     }
 
-    apic_id_limit = pc_apic_id_limit(max_cpus);
-    if (apic_id_limit > ACPI_CPU_HOTPLUG_ID_LIMIT) {
-        error_report("max_cpus is too large. APIC ID of last CPU is %lu",
-                     apic_id_limit - 1);
+    if (pcms->apic_id_limit > ACPI_CPU_HOTPLUG_ID_LIMIT) {
+        error_report("max_cpus is too large. APIC ID of last CPU is %u",
+                     pcms->apic_id_limit - 1);
         exit(1);
     }
 
@@ -1197,7 +1191,6 @@ PcGuestInfo *pc_guest_info_init(PCMachineState *pcms)
 
     guest_info->ram_size_below_4g = pcms->below_4g_mem_size;
     guest_info->ram_size = pcms->below_4g_mem_size + pcms->above_4g_mem_size;
-    guest_info->apic_id_limit = pc_apic_id_limit(max_cpus);
     guest_info->apic_xrupt_override = kvm_allows_irq0_override();
     guest_info->numa_nodes = nb_numa_nodes;
     guest_info->node_mem = g_malloc0(guest_info->numa_nodes *
@@ -1206,12 +1199,12 @@ PcGuestInfo *pc_guest_info_init(PCMachineState *pcms)
         guest_info->node_mem[i] = numa_info[i].node_mem;
     }
 
-    guest_info->node_cpu = g_malloc0(guest_info->apic_id_limit *
+    guest_info->node_cpu = g_malloc0(pcms->apic_id_limit *
                                      sizeof *guest_info->node_cpu);
 
     for (i = 0; i < max_cpus; i++) {
         unsigned int apic_id = x86_cpu_apic_id_from_index(i);
-        assert(apic_id < guest_info->apic_id_limit);
+        assert(apic_id < pcms->apic_id_limit);
         for (j = 0; j < nb_numa_nodes; j++) {
             if (test_bit(i, numa_info[j].node_cpu)) {
                 guest_info->node_cpu[apic_id] = j;
@@ -1386,7 +1379,7 @@ FWCfgState *pc_memory_init(PCMachineState *pcms,
                                         option_rom_mr,
                                         1);
 
-    fw_cfg = bochs_bios_init(&address_space_memory);
+    fw_cfg = bochs_bios_init(&address_space_memory, pcms);
 
     rom_set_fw(fw_cfg);
 
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 65e8f24..315fed2 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -59,6 +59,9 @@ struct PCMachineState {
 
     /* RAM information (sizes, addresses, configuration): */
     ram_addr_t below_4g_mem_size, above_4g_mem_size;
+
+    /* APIC ID limit for current max_cpus */
+    unsigned apic_id_limit;
 };
 
 #define PC_MACHINE_ACPI_DEVICE_PROP "acpi-device"
@@ -154,7 +157,6 @@ typedef struct PcPciInfo {
 struct PcGuestInfo {
     bool isapc_ram_fw;
     hwaddr ram_size, ram_size_below_4g;
-    unsigned apic_id_limit;
     bool apic_xrupt_override;
     uint64_t numa_nodes;
     uint64_t *node_mem;
-- 
1.8.3.1