s3_shutdown_flag needs external linkage

diff --git a/hw/piix4acpi.c b/hw/piix4acpi.c
index ec3b5153c98c3deb8b92eb3bfac4f3ba6df10456..dfbb4b0ed9768eea97a5501471d718bfbf4eb595 100644 (file)
--- a/hw/piix4acpi.c
+++ b/hw/piix4acpi.c
@@ -82,7 +82,7 @@ typedef struct PHPSlots {
 } PHPSlots;
 
 PHPSlots php_slots;
-static int s3_shutdown_flag;
+int s3_shutdown_flag;
 static qemu_irq sci_irq;
 
 static void piix4acpi_save(QEMUFile *f, void *opaque)