xen: PV on HVM: support PV spinlocks and IPIs

Initialize PV spinlocks on boot CPU right after native_smp_prepare_cpus
(that switch to APIC mode and initialize APIC routing); on secondary
CPUs on CPU_UP_PREPARE.

Enable the usage of event channels to send and receive IPIs when
running as a PV on HVM guest.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 72a4c7959045..30612441ed99 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -509,3 +509,41 @@ void __init xen_smp_init(void)
         xen_fill_possible_map();
         xen_init_spinlocks();
 }
+
+static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
+{
+        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();
+}
+
+static int __cpuinit xen_hvm_cpu_up(unsigned int cpu)
+{
+        int rc;
+        rc = native_cpu_up(cpu);
+        WARN_ON (xen_smp_intr_init(cpu));
+        return rc;
+}
+
+static void xen_hvm_cpu_die(unsigned int cpu)
+{
+        unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
+        unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
+        unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
+        unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL);
+        native_cpu_die(cpu);
+}
+
+void __init xen_hvm_smp_init(void)
+{
+        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;
+        smp_ops.cpu_die = xen_hvm_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;
+}