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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2008-05-27 02:31:27 +0400 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2008-05-27 12:11:38 +0400 |
| commit | 0e91398f2a5d4eb6b07df8115917d0d1cf3e9b58 (patch) | |
| tree | c6a3b31b7bcbbfb55bb2304d8651abdd28cdad54 /include/xen/events.h | |
| parent | 7d88d32a4670af583c896e5ecd3929b78538ca62 (diff) | |
| download | linux-0e91398f2a5d4eb6b07df8115917d0d1cf3e9b58.tar.xz | |
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.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/xen/events.h b/include/xen/events.h index a82ec0c45c38..67c4436554a9 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 */ |