KVM: keep track of which task is running a KVM vcpu
[linux-2.6.git] / virt / kvm / kvm_main.c
index 002fe0b..bc8bfd1 100644 (file)
@@ -137,6 +137,14 @@ void vcpu_load(struct kvm_vcpu *vcpu)
        int cpu;
 
        mutex_lock(&vcpu->mutex);
+       if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) {
+               /* The thread running this VCPU changed. */
+               struct pid *oldpid = vcpu->pid;
+               struct pid *newpid = get_task_pid(current, PIDTYPE_PID);
+               rcu_assign_pointer(vcpu->pid, newpid);
+               synchronize_rcu();
+               put_pid(oldpid);
+       }
        cpu = get_cpu();
        preempt_notifier_register(&vcpu->preempt_notifier);
        kvm_arch_vcpu_load(vcpu, cpu);
@@ -212,6 +220,7 @@ int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
        vcpu->cpu = -1;
        vcpu->kvm = kvm;
        vcpu->vcpu_id = id;
+       vcpu->pid = NULL;
        init_waitqueue_head(&vcpu->wq);
        kvm_async_pf_vcpu_init(vcpu);
 
@@ -236,6 +245,7 @@ EXPORT_SYMBOL_GPL(kvm_vcpu_init);
 
 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
 {
+       put_pid(vcpu->pid);
        kvm_arch_vcpu_uninit(vcpu);
        free_page((unsigned long)vcpu->run);
 }