KVM: Consolidate arch specific vcpu ioctl locking

Now that all arch specific ioctls have centralized locking, it is easy to
move it to the central dispatcher.

Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index caeed7b..a1d8750 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -512,17 +512,16 @@
 	void __user *argp = (void __user *)arg;
 	long r;
 
-	if (ioctl == KVM_INTERRUPT) {
+	switch (ioctl) {
+	case KVM_INTERRUPT: {
 		struct kvm_interrupt irq;
 		r = -EFAULT;
 		if (copy_from_user(&irq, argp, sizeof(irq)))
-			goto out_nolock;
+			goto out;
 		r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
-		goto out_nolock;
+		goto out;
 	}
 
-	vcpu_load(vcpu);
-	switch (ioctl) {
 	case KVM_ENABLE_CAP:
 	{
 		struct kvm_enable_cap cap;
@@ -537,8 +536,6 @@
 	}
 
 out:
-	vcpu_put(vcpu);
-out_nolock:
 	return r;
 }