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-rw-r--r--arch/x86/power/cpu.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c
index d5f64996394a..b12c26e2e309 100644
--- a/arch/x86/power/cpu.c
+++ b/arch/x86/power/cpu.c
@@ -12,6 +12,7 @@
#include <linux/export.h>
#include <linux/smp.h>
#include <linux/perf_event.h>
+#include <linux/tboot.h>
#include <asm/pgtable.h>
#include <asm/proto.h>
@@ -266,6 +267,35 @@ void notrace restore_processor_state(void)
EXPORT_SYMBOL(restore_processor_state);
#endif
+#if defined(CONFIG_HIBERNATION) && defined(CONFIG_HOTPLUG_CPU)
+static void resume_play_dead(void)
+{
+ play_dead_common();
+ tboot_shutdown(TB_SHUTDOWN_WFS);
+ hlt_play_dead();
+}
+
+int hibernate_resume_nonboot_cpu_disable(void)
+{
+ void (*play_dead)(void) = smp_ops.play_dead;
+ int ret;
+
+ /*
+ * Ensure that MONITOR/MWAIT will not be used in the "play dead" loop
+ * during hibernate image restoration, because it is likely that the
+ * monitored address will be actually written to at that time and then
+ * the "dead" CPU will attempt to execute instructions again, but the
+ * address in its instruction pointer may not be possible to resolve
+ * any more at that point (the page tables used by it previously may
+ * have been overwritten by hibernate image data).
+ */
+ smp_ops.play_dead = resume_play_dead;
+ ret = disable_nonboot_cpus();
+ smp_ops.play_dead = play_dead;
+ return ret;
+}
+#endif
+
/*
* When bsp_check() is called in hibernate and suspend, cpu hotplug
* is disabled already. So it's unnessary to handle race condition between