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authorJeremy Fitzhardinge <jeremy@goop.org>2008-05-26 18:31:27 -0400
committerThomas Gleixner <tglx@linutronix.de>2008-05-27 04:11:38 -0400
commit0e91398f2a5d4eb6b07df8115917d0d1cf3e9b58 (patch)
treec6a3b31b7bcbbfb55bb2304d8651abdd28cdad54 /arch/x86/xen/time.c
parent7d88d32a4670af583c896e5ecd3929b78538ca62 (diff)
xen: implement save/restore
This patch implements Xen save/restore and migration. Saving is triggered via xenbus, which is polled in drivers/xen/manage.c. When a suspend request comes in, the kernel prepares itself for saving by: 1 - Freeze all processes. This is primarily to prevent any partially-completed pagetable updates from confusing the suspend process. If CONFIG_PREEMPT isn't defined, then this isn't necessary. 2 - Suspend xenbus and other devices 3 - Stop_machine, to make sure all the other vcpus are quiescent. The Xen tools require the domain to run its save off vcpu0. 4 - Within the stop_machine state, it pins any unpinned pgds (under construction or destruction), performs canonicalizes various other pieces of state (mostly converting mfns to pfns), and finally 5 - Suspend the domain Restore reverses the steps used to save the domain, ending when all the frozen processes are thawed. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/xen/time.c')
-rw-r--r--arch/x86/xen/time.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index c39e1a5aa241..0bef256e5f2d 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -572,6 +572,14 @@ void xen_setup_cpu_clockevents(void)
572 clockevents_register_device(&__get_cpu_var(xen_clock_events)); 572 clockevents_register_device(&__get_cpu_var(xen_clock_events));
573} 573}
574 574
575void xen_time_suspend(void)
576{
577}
578
579void xen_time_resume(void)
580{
581}
582
575__init void xen_time_init(void) 583__init void xen_time_init(void)
576{ 584{
577 int cpu = smp_processor_id(); 585 int cpu = smp_processor_id();