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authorMarcelo Tosatti <mtosatti@redhat.com>2012-02-13 17:07:27 +0400
committerAvi Kivity <avi@redhat.com>2012-03-20 14:37:45 +0400
commitb74f05d61b73af584d0c39121980171389ecfaaa (patch)
tree1406185fb45430549b37ef3b4f62f9c5772ef139 /arch/x86/power
parent9587190107d0c0cbaccbf7bf6b0245d29095a9ae (diff)
downloadlinux-b74f05d61b73af584d0c39121980171389ecfaaa.tar.xz
x86: kvmclock: abstract save/restore sched_clock_state
Upon resume from hibernation, CPU 0's hvclock area contains the old values for system_time and tsc_timestamp. It is necessary for the hypervisor to update these values with uptodate ones before the CPU uses them. Abstract TSC's save/restore sched_clock_state functions and use restore_state to write to KVM_SYSTEM_TIME MSR, forcing an update. Also move restore_sched_clock_state before __restore_processor_state, since the later calls CONFIG_LOCK_STAT's lockstat_clock (also for TSC). Thanks to Igor Mammedov for tracking it down. Fixes suspend-to-disk with kvmclock. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/power')
-rw-r--r--arch/x86/power/cpu.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c
index f10c0afa1cb4..0e76a2814127 100644
--- a/arch/x86/power/cpu.c
+++ b/arch/x86/power/cpu.c
@@ -114,7 +114,7 @@ static void __save_processor_state(struct saved_context *ctxt)
void save_processor_state(void)
{
__save_processor_state(&saved_context);
- save_sched_clock_state();
+ x86_platform.save_sched_clock_state();
}
#ifdef CONFIG_X86_32
EXPORT_SYMBOL(save_processor_state);
@@ -230,8 +230,8 @@ static void __restore_processor_state(struct saved_context *ctxt)
/* Needed by apm.c */
void restore_processor_state(void)
{
+ x86_platform.restore_sched_clock_state();
__restore_processor_state(&saved_context);
- restore_sched_clock_state();
}
#ifdef CONFIG_X86_32
EXPORT_SYMBOL(restore_processor_state);