[Xen-devel] [PATCH 5/7] xen: PV on HVM: support PV spinlocks

[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.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 arch/x86/xen/enlighten.c |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 2f67e2e..9c1628b 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;
@@ -1341,6 +1343,20 @@ static struct notifier_block __cpuinitdata 
xen_hvm_cpu_notifier = {
        .notifier_call  = xen_hvm_cpu_notify,
 };
 
+static void xen_hvm_spinlock_init(void)
+{
+       if (!xen_have_vector_callback)
+               return;
+       xen_init_lock_cpu(0);
+       xen_init_spinlocks();
+}
+
+static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
+{
+       native_smp_prepare_cpus(max_cpus);
+       xen_hvm_spinlock_init();
+}
+
 static void __init xen_hvm_guest_init(void)
 {
        int r;
@@ -1360,6 +1376,7 @@ static void __init xen_hvm_guest_init(void)
        x86_init.irqs.intr_init = xen_init_IRQ;
        xen_hvm_init_time_ops();
        xen_hvm_init_mmu_ops();
+       smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
 }
 
 static bool __init xen_hvm_platform(void)
-- 
1.5.6.5


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