Merge tag 'for-linus-4.8b-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull xen regression fix from David Vrabel:
 "Fix SMP boot in arm guests"

* tag 'for-linus-4.8b-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  arm/xen: fix SMP guests boot

arch/arm/xen/enlighten.c

@@ -170,9 +170,6 @@ static int xen_starting_cpu(unsigned int cpu)
 	pr_info("Xen: initializing cpu%d\n", cpu);
 	vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
 
-	/* Direct vCPU id mapping for ARM guests. */
-	per_cpu(xen_vcpu_id, cpu) = cpu;
-
 	info.mfn = virt_to_gfn(vcpup);
 	info.offset = xen_offset_in_page(vcpup);
 
@@ -330,6 +327,7 @@ static int __init xen_guest_init(void)
 {
 	struct xen_add_to_physmap xatp;
 	struct shared_info *shared_info_page = NULL;
+	int cpu;
 
 	if (!xen_domain())
 		return 0;
@@ -380,7 +378,8 @@ static int __init xen_guest_init(void)
 		return -ENOMEM;
 
 	/* Direct vCPU id mapping for ARM guests. */
-	per_cpu(xen_vcpu_id, 0) = 0;
+	for_each_possible_cpu(cpu)
+		per_cpu(xen_vcpu_id, cpu) = cpu;
 
 	xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames();
 	if (xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn,