[Qemu-devel] [PATCH v2 07/10] pc: acpi: create MADT.lapic entries only for valid lapics

[Igor Mammedov]

do not assume that all lapics in range 0..apic_id_limit
are valid and do not create lapic entries for not
possible lapics in MADT.

Signed-off-by: Igor Mammedov <imamm...@redhat.com>
---
 hw/i386/acpi-build.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index de55a72..72ecb0c 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -363,8 +363,10 @@ build_fadt(GArray *table_data, GArray *linker, AcpiPmInfo 
*pm,
 }
 
 static void
-build_madt(GArray *table_data, GArray *linker, AcpiCpuInfo *cpu)
+build_madt(GArray *table_data, GArray *linker, MachineState *machine)
 {
+    MachineClass *mc = MACHINE_GET_CLASS(machine);
+    GArray *apic_id_list = mc->possible_cpu_arch_ids();
     PCMachineState *pcms = PC_MACHINE(qdev_get_machine());
     int madt_start = table_data->len;
 
@@ -378,18 +380,23 @@ build_madt(GArray *table_data, GArray *linker, 
AcpiCpuInfo *cpu)
     madt->local_apic_address = cpu_to_le32(APIC_DEFAULT_ADDRESS);
     madt->flags = cpu_to_le32(1);
 
-    for (i = 0; i < pcms->apic_id_limit; i++) {
+    for (i = 0; i < apic_id_list->len; i++) {
         AcpiMadtProcessorApic *apic = acpi_data_push(table_data, sizeof *apic);
+        CPUArchId id = FETCH_CPU_ARCH_ID(apic_id_list, i);
+        int apic_id = id.arch_id;
+
         apic->type = ACPI_APIC_PROCESSOR;
         apic->length = sizeof(*apic);
-        apic->processor_id = i;
-        apic->local_apic_id = i;
-        if (test_bit(i, cpu->found_cpus)) {
+        apic->processor_id = apic_id;
+        apic->local_apic_id = apic_id;
+        if (id.cpu != NULL) {
             apic->flags = cpu_to_le32(1);
         } else {
             apic->flags = cpu_to_le32(0);
         }
     }
+    g_array_free(apic_id_list, true);
+
     io_apic = acpi_data_push(table_data, sizeof *io_apic);
     io_apic->type = ACPI_APIC_IO;
     io_apic->length = sizeof(*io_apic);
@@ -2694,7 +2701,7 @@ void acpi_build(AcpiBuildTables *tables)
     aml_len += tables_blob->len - fadt;
 
     acpi_add_table(table_offsets, tables_blob);
-    build_madt(tables_blob, tables->linker, &cpu);
+    build_madt(tables_blob, tables->linker, machine);
 
     if (misc.has_hpet) {
         acpi_add_table(table_offsets, tables_blob);
-- 
1.8.3.1