x86/xen: split xen_smp_prepare_boot_cpu()

Split xen_smp_prepare_boot_cpu() into xen_pv_smp_prepare_boot_cpu() and
xen_hvm_smp_prepare_boot_cpu() to support further splitting of smp.c.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

arch/x86/xen/smp.c

@@ -297,12 +297,11 @@ static void __init xen_filter_cpu_maps(void)
 
 }
 
-static void __init xen_smp_prepare_boot_cpu(void)
+static void __init xen_pv_smp_prepare_boot_cpu(void)
 {
 	BUG_ON(smp_processor_id() != 0);
 	native_smp_prepare_boot_cpu();
 
-	if (xen_pv_domain()) {
 	if (!xen_feature(XENFEAT_writable_page_tables))
 		/* We've switched to the "real" per-cpu gdt, so make
 		 * sure the old memory can be recycled. */
@@ -319,12 +318,24 @@ static void __init xen_smp_prepare_boot_cpu(void)
 
 	xen_filter_cpu_maps();
 	xen_setup_vcpu_info_placement();
-	}
+
+	/*
+	 * The alternative logic (which patches the unlock/lock) runs before
+	 * the smp bootup up code is activated. Hence we need to set this up
+	 * the core kernel is being patched. Otherwise we will have only
+	 * modules patched but not core code.
+	 */
+	xen_init_spinlocks();
+}
+
+static void __init xen_hvm_smp_prepare_boot_cpu(void)
+{
+	BUG_ON(smp_processor_id() != 0);
+	native_smp_prepare_boot_cpu();
 
 	/*
 	 * Setup vcpu_info for boot CPU.
 	 */
-	if (xen_hvm_domain())
 	xen_vcpu_setup(0);
 
 	/*
@@ -717,7 +728,7 @@ static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
 }
 
 static const struct smp_ops xen_smp_ops __initconst = {
-	.smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu,
+	.smp_prepare_boot_cpu = xen_pv_smp_prepare_boot_cpu,
 	.smp_prepare_cpus = xen_smp_prepare_cpus,
 	.smp_cpus_done = xen_smp_cpus_done,
 
@@ -754,5 +765,5 @@ void __init xen_hvm_smp_init(void)
 	smp_ops.cpu_die = xen_cpu_die;
 	smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
 	smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
-	smp_ops.smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu;
+	smp_ops.smp_prepare_boot_cpu = xen_hvm_smp_prepare_boot_cpu;
 }