xen: Do not enable PV IPIs when vector callback not present

Fix regression for HVM case on older (<4.1.1) hypervisors caused by

commit 99bbb3a84a99cd04ab16b998b20f01a72cfa9f4f
Author: Stefano Stabellini <[e-mail]>
Date: Thu Dec 2 17:55:10 2010 +0000

xen: PV on HVM: support PV spinlocks and IPIs

This change replaced the SMP operations with event based handlers without
taking into account that this only works when the hypervisor supports
callback vectors. This causes unexplainable hangs early on boot for
HVM guests with more than one CPU.

BugLink: http://bugs.launchpad.net/bugs/791850

CC: [e-mail]
Signed-off-by: Stefan Bader <[e-mail]>
Signed-off-by: Stefano Stabellini <[e-mail]>
Tested-and-Reported-by: Stefan Bader <[e-mail]>
Signed-off-by: Konrad Rzeszutek Wilk <[e-mail]>

arch/x86/xen/smp.c

···
 	native_smp_prepare_cpus(max_cpus);
 	WARN_ON(xen_smp_intr_init(0));
 
-	if (!xen_have_vector_callback)
-		return;
 	xen_init_lock_cpu(0);
 	xen_init_spinlocks();
 }
···
 
 void __init xen_hvm_smp_init(void)
 {
+	if (!xen_have_vector_callback)
+		return;
 	smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
 	smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
 	smp_ops.cpu_up = xen_hvm_cpu_up;