acpi: Add ACPI_CPU_HOTPLUG_ID_LIMIT macro

The new macro will be helpful to allow us to detect too large SMP limits
before it is too late.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/include/hw/acpi/cpu_hotplug_defs.h b/include/hw/acpi/cpu_hotplug_defs.h
index 2725b50..9f33663 100644 (file)
--- a/include/hw/acpi/cpu_hotplug_defs.h
+++ b/include/hw/acpi/cpu_hotplug_defs.h
@@ -17,7 +17,15 @@
  * between C and ASL code.
  */
 #define ACPI_CPU_HOTPLUG_STATUS 4
+
+/* Limit for CPU arch IDs for CPU hotplug. All hotpluggable CPUs should
+ * have CPUClass.get_arch_id() < ACPI_CPU_HOTPLUG_ID_LIMIT.
+ */
+#define ACPI_CPU_HOTPLUG_ID_LIMIT 256
+
+/* 256 CPU IDs, 8 bits per entry: */
 #define ACPI_GPE_PROC_LEN 32
+
 #define ICH9_CPU_HOTPLUG_IO_BASE 0x0CD8
 #define PIIX4_CPU_HOTPLUG_IO_BASE 0xaf00