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Re: [Xen-devel] [PATCH RFC v6 10/11] pvqspinlock, x86: Enable qspinlock PV support for KVM



On 03/13/2014 09:59 AM, Paolo Bonzini wrote:
Il 12/03/2014 19:54, Waiman Long ha scritto:
@@ -807,8 +889,13 @@ void __init kvm_spinlock_init(void)
     if (!kvm_para_has_feature(KVM_FEATURE_PV_UNHALT))
         return;

+#ifdef CONFIG_QUEUE_SPINLOCK
+    pv_lock_ops.kick_cpu = kvm_kick_cpu_type;
+    pv_lock_ops.hibernate = kvm_hibernate;
+#else
     pv_lock_ops.lock_spinning = PV_CALLEE_SAVE(kvm_lock_spinning);
     pv_lock_ops.unlock_kick = kvm_unlock_kick;
+#endif

This should also disable the unfair path.

Paolo


The unfair lock uses a different jump label and does not require any special PV ops. There is a separate init function for that.

-Longman

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