path: root/include/xen
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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
parentxenbus: rebind irq on restore (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 'include/xen')
3 files changed, 15 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 */
diff --git a/include/xen/grant_table.h b/include/xen/grant_table.h
index 466204846121..a40f1cd91be1 100644
--- a/include/xen/grant_table.h
+++ b/include/xen/grant_table.h
@@ -51,6 +51,9 @@ struct gnttab_free_callback {
u16 count;
+int gnttab_suspend(void);
+int gnttab_resume(void);
int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
int readonly);
diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
index 10ddfe0142d0..5d7a6db54a8c 100644
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -5,4 +5,13 @@
DECLARE_PER_CPU(struct vcpu_info *, xen_vcpu);
+void xen_pre_suspend(void);
+void xen_post_suspend(int suspend_cancelled);
+void xen_mm_pin_all(void);
+void xen_mm_unpin_all(void);
+void xen_time_suspend(void);
+void xen_time_resume(void);
#endif /* INCLUDE_XEN_OPS_H */