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-rw-r--r--arch/x86/include/asm/smp.h1
-rw-r--r--arch/x86/kernel/smpboot.c2
-rw-r--r--arch/x86/power/cpu.c30
-rw-r--r--kernel/power/hibernate.c7
-rw-r--r--kernel/power/power.h2
5 files changed, 40 insertions, 2 deletions
diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
index 66b0573..7427ca8 100644
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -135,6 +135,7 @@ int native_cpu_up(unsigned int cpunum, struct task_struct *tidle);
int native_cpu_disable(void);
int common_cpu_die(unsigned int cpu);
void native_cpu_die(unsigned int cpu);
+void hlt_play_dead(void);
void native_play_dead(void);
void play_dead_common(void);
void wbinvd_on_cpu(int cpu);
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index fafe8b9..8264dfa 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1622,7 +1622,7 @@ static inline void mwait_play_dead(void)
}
}
-static inline void hlt_play_dead(void)
+void hlt_play_dead(void)
{
if (__this_cpu_read(cpu_info.x86) >= 4)
wbinvd();
diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c
index d5f6499..b12c26e 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
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 51441d8..5f3523e 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -409,6 +409,11 @@ int hibernation_snapshot(int platform_mode)
goto Close;
}
+int __weak hibernate_resume_nonboot_cpu_disable(void)
+{
+ return disable_nonboot_cpus();
+}
+
/**
* resume_target_kernel - Restore system state from a hibernation image.
* @platform_mode: Whether or not to use the platform driver.
@@ -433,7 +438,7 @@ static int resume_target_kernel(bool platform_mode)
if (error)
goto Cleanup;
- error = disable_nonboot_cpus();
+ error = hibernate_resume_nonboot_cpu_disable();
if (error)
goto Enable_cpus;
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 064963e..242d8b8 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -38,6 +38,8 @@ static inline char *check_image_kernel(struct swsusp_info *info)
}
#endif /* CONFIG_ARCH_HIBERNATION_HEADER */
+extern int hibernate_resume_nonboot_cpu_disable(void);
+
/*
* Keep some memory free so that I/O operations can succeed without paging
* [Might this be more than 4 MB?]
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