[Xen-devel] [PATCH v2 5/6] xen: PV on HVM: support PV spinlocks and IPIs

[stefano.stabellini@xxxxxxxxxxxxx]

From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
---
 arch/x86/xen/enlighten.c |    3 +++
 arch/x86/xen/smp.c       |   38 ++++++++++++++++++++++++++++++++++++++
 arch/x86/xen/xen-ops.h   |    2 ++
 3 files changed, 43 insertions(+), 0 deletions(-)

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 2f67e2e..fe02574 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1330,6 +1330,8 @@ static int __cpuinit xen_hvm_cpu_notify(struct 
notifier_block *self,
        switch (action) {
        case CPU_UP_PREPARE:
                per_cpu(xen_vcpu, cpu) = 
&HYPERVISOR_shared_info->vcpu_info[cpu];
+               if (xen_have_vector_callback)
+                       xen_init_lock_cpu(cpu);
                break;
        default:
                break;
@@ -1354,6 +1356,7 @@ static void __init xen_hvm_guest_init(void)
 
        if (xen_feature(XENFEAT_hvm_callback_vector))
                xen_have_vector_callback = 1;
+       xen_hvm_smp_init();
        register_cpu_notifier(&xen_hvm_cpu_notifier);
        xen_unplug_emulated_devices();
        have_vcpu_info_placement = 0;
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 72a4c79..3061244 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;
+}
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 9d41bf9..3112f55 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -64,10 +64,12 @@ void xen_setup_vcpu_info_placement(void);
 
 #ifdef CONFIG_SMP
 void xen_smp_init(void);
+void __init xen_hvm_smp_init(void);
 
 extern cpumask_var_t xen_cpu_initialized_map;
 #else
 static inline void xen_smp_init(void) {}
+static inline void xen_hvm_smp_init(void) {}
 #endif
 
 #ifdef CONFIG_PARAVIRT_SPINLOCKS
-- 
1.5.6.5


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel