xen/spinlock: Disable IRQ spinlock (PV) allocation on PVHVM

See git commit f10cd52 (xen: disable PV spinlocks on HVM) for details. But we did not disable it everywhere - which means that when we boot as PVHVM we end up allocating per-CPU irq line for spinlock. This fixes that. Signed-off-by: Konrad Rzeszutek Wilk <[email protected]>
chewitt · Apr 16, 2013 · 70dd499 · 70dd499
1 parent cb9c6f1
commit 70dd499
Showing 1 changed file with 21 additions and 0 deletions.
diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
@@ -367,6 +367,13 @@ void __cpuinit xen_init_lock_cpu(int cpu)
 	WARN(per_cpu(lock_kicker_irq, cpu) > 0, "spinlock on CPU%d exists on IRQ%d!\n",
 	     cpu, per_cpu(lock_kicker_irq, cpu));
 
+	/*
+	 * See git commit f10cd522c5fbfec9ae3cc01967868c9c2401ed23
+	 * (xen: disable PV spinlocks on HVM)
+	 */
+	if (xen_hvm_domain())
+		return;
+
 	name = kasprintf(GFP_KERNEL, "spinlock%d", cpu);
 	irq = bind_ipi_to_irqhandler(XEN_SPIN_UNLOCK_VECTOR,
 				     cpu,
@@ -385,12 +392,26 @@ void __cpuinit xen_init_lock_cpu(int cpu)
 
 void xen_uninit_lock_cpu(int cpu)
 {
+	/*
+	 * See git commit f10cd522c5fbfec9ae3cc01967868c9c2401ed23
+	 * (xen: disable PV spinlocks on HVM)
+	 */
+	if (xen_hvm_domain())
+		return;
+
 	unbind_from_irqhandler(per_cpu(lock_kicker_irq, cpu), NULL);
 	per_cpu(lock_kicker_irq, cpu) = -1;
 }
 
 void __init xen_init_spinlocks(void)
 {
+	/*
+	 * See git commit f10cd522c5fbfec9ae3cc01967868c9c2401ed23
+	 * (xen: disable PV spinlocks on HVM)
+	 */
+	if (xen_hvm_domain())
+		return;
+
 	BUILD_BUG_ON(sizeof(struct xen_spinlock) > sizeof(arch_spinlock_t));
 
 	pv_lock_ops.spin_is_locked = xen_spin_is_locked;