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authorJeremy Fitzhardinge <jeremy@goop.org>2008-05-26 23:31:27 +0100
committerThomas Gleixner <tglx@linutronix.de>2008-05-27 10:11:38 +0200
commit0e91398f2a5d4eb6b07df8115917d0d1cf3e9b58 (patch)
treec6a3b31b7bcbbfb55bb2304d8651abdd28cdad54 /include/xen/events.h
parent7d88d32a4670af583c896e5ecd3929b78538ca62 (diff)
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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 'include/xen/events.h')
-rw-r--r--include/xen/events.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/xen/events.h b/include/xen/events.h
index a82ec0c45c3..67c4436554a 100644
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -41,4 +41,7 @@ static inline void notify_remote_via_evtchn(int port)
}
extern void notify_remote_via_irq(int irq);
+
+extern void xen_irq_resume(void);
+
#endif /* _XEN_EVENTS_H */