Merge tag 'stable/for-linus-3.8-rc0-bugfix-tag' of git://git.kernel.o…

…rg/pub/scm/linux/kernel/git/konrad/xen

Pull Xen bugfixes from Konrad Rzeszutek Wilk:
 "Two fixes.  One of them is caused by the recent change introduced by
  the 'x86-bsp-hotplug-for-linus' tip tree that inhibited bootup (old
  function does not do what it used to do).  The other one is just a
  vanilla bug.

   - Fix to bootup regression introduced by 'x86-bsp-hotplug-for-linus'
     tip branch.
   - Fix to vcpu hotplug code."

* tag 'stable/for-linus-3.8-rc0-bugfix-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  xen/vcpu: Fix vcpu restore path.
  xen: Add EVTCHNOP_reset in Xen interface header files.
  xen/smp: Use smp_store_boot_cpu_info() to store cpu info for BSP during boot time.

arch/x86/xen/enlighten.c

@@ -193,10 +193,11 @@ void xen_vcpu_restore(void)
 {
 	int cpu;
 
-	for_each_online_cpu(cpu) {
+	for_each_possible_cpu(cpu) {
 		bool other_cpu = (cpu != smp_processor_id());
+		bool is_up = HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL);
 
-		if (other_cpu &&
+		if (other_cpu && is_up &&
 		    HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL))
 			BUG();
 
@@ -205,7 +206,7 @@ void xen_vcpu_restore(void)
 		if (have_vcpu_info_placement)
 			xen_vcpu_setup(cpu);
 
-		if (other_cpu &&
+		if (other_cpu && is_up &&
 		    HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL))
 			BUG();
 	}

arch/x86/xen/smp.c

@@ -254,7 +254,7 @@ static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
 	}
 	xen_init_lock_cpu(0);
 
-	smp_store_cpu_info(0);
+	smp_store_boot_cpu_info();
 	cpu_data(0).x86_max_cores = 1;
 
 	for_each_possible_cpu(i) {

include/xen/interface/event_channel.h

@@ -177,6 +177,19 @@ struct evtchn_unmask {
 	evtchn_port_t port;
 };
 
+/*
+ * EVTCHNOP_reset: Close all event channels associated with specified domain.
+ * NOTES:
+ *  1. <dom> may be specified as DOMID_SELF.
+ *  2. Only a sufficiently-privileged domain may specify other than DOMID_SELF.
+ */
+#define EVTCHNOP_reset		 10
+struct evtchn_reset {
+	/* IN parameters. */
+	domid_t dom;
+};
+typedef struct evtchn_reset evtchn_reset_t;
+
 struct evtchn_op {
 	uint32_t cmd; /* EVTCHNOP_* */
 	union {