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| author | Jeremy Fitzhardinge | 2008-05-27 00:31:27 +0200 |
|---|---|---|
| committer | Thomas Gleixner | 2008-05-27 10:11:38 +0200 |
| commit | 0e91398f2a5d4eb6b07df8115917d0d1cf3e9b58 (patch) | |
| tree | c6a3b31b7bcbbfb55bb2304d8651abdd28cdad54 /arch/x86/xen/smp.c | |
| parent | xenbus: rebind irq on restore (diff) | |
| download | kernel-qcow2-linux-0e91398f2a5d4eb6b07df8115917d0d1cf3e9b58.tar.gz kernel-qcow2-linux-0e91398f2a5d4eb6b07df8115917d0d1cf3e9b58.tar.xz kernel-qcow2-linux-0e91398f2a5d4eb6b07df8115917d0d1cf3e9b58.zip | |
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/smp.c')
| -rw-r--r-- | arch/x86/xen/smp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c index 74ab8968c525..d2e3c20127d7 100644 --- a/arch/x86/xen/smp.c +++ b/arch/x86/xen/smp.c @@ -35,7 +35,7 @@ #include "xen-ops.h" #include "mmu.h" -static cpumask_t xen_cpu_initialized_map; +cpumask_t xen_cpu_initialized_map; static DEFINE_PER_CPU(int, resched_irq) = -1; static DEFINE_PER_CPU(int, callfunc_irq) = -1; static DEFINE_PER_CPU(int, debug_irq) = -1; |