xen: machine operations

Make the appropriate hypercalls to halt and reboot the virtual machine.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Acked-by: Chris Wright <chrisw@sous-sol.org>

arch/i386/xen/enlighten.c

@@ -30,6 +30,7 @@
 #include <xen/interface/xen.h>
 #include <xen/interface/physdev.h>
 #include <xen/interface/vcpu.h>
+#include <xen/interface/sched.h>
 #include <xen/features.h>
 #include <xen/page.h>
 
@@ -43,6 +44,7 @@
 #include <asm/desc.h>
 #include <asm/pgtable.h>
 #include <asm/tlbflush.h>
+#include <asm/reboot.h>
 
 #include "xen-ops.h"
 #include "mmu.h"
@@ -900,6 +902,45 @@ static const struct smp_ops xen_smp_ops __initdata = {
 };
 #endif	/* CONFIG_SMP */
 
+static void xen_reboot(int reason)
+{
+#ifdef CONFIG_SMP
+	smp_send_stop();
+#endif
+
+	if (HYPERVISOR_sched_op(SCHEDOP_shutdown, reason))
+		BUG();
+}
+
+static void xen_restart(char *msg)
+{
+	xen_reboot(SHUTDOWN_reboot);
+}
+
+static void xen_emergency_restart(void)
+{
+	xen_reboot(SHUTDOWN_reboot);
+}
+
+static void xen_machine_halt(void)
+{
+	xen_reboot(SHUTDOWN_poweroff);
+}
+
+static void xen_crash_shutdown(struct pt_regs *regs)
+{
+	xen_reboot(SHUTDOWN_crash);
+}
+
+static const struct machine_ops __initdata xen_machine_ops = {
+	.restart = xen_restart,
+	.halt = xen_machine_halt,
+	.power_off = xen_machine_halt,
+	.shutdown = xen_machine_halt,
+	.crash_shutdown = xen_crash_shutdown,
+	.emergency_restart = xen_emergency_restart,
+};
+
 /* First C function to be called on Xen boot */
 asmlinkage void __init xen_start_kernel(void)
 {
@@ -912,6 +953,8 @@ asmlinkage void __init xen_start_kernel(void)
 
 	/* Install Xen paravirt ops */
 	paravirt_ops = xen_paravirt_ops;
+	machine_ops = xen_machine_ops;
+
 #ifdef CONFIG_SMP
 	smp_ops = xen_smp_ops;
 #endif

arch/i386/xen/smp.c

@@ -311,9 +311,7 @@ static void stop_self(void *v)
 
 void xen_smp_send_stop(void)
 {
-	cpumask_t mask = cpu_online_map;
-	cpu_clear(smp_processor_id(), mask);
-	xen_smp_call_function_mask(mask, stop_self, NULL, 0);
+	smp_call_function(stop_self, NULL, 0, 0);
 }
 
 void xen_smp_send_reschedule(int cpu)