On Sat, Nov 10, 2012 at 04:44:51PM +0100, Christoffer Dall wrote:
[...]

+int kvm_vgic_set_addr(struct kvm *kvm, unsigned long type, u64 addr)
+{
+	int r = 0;
+	struct vgic_dist *vgic = &kvm->arch.vgic;
+
+	if (addr & ~KVM_PHYS_MASK)
+		return -E2BIG;
+
+	if (addr & ~PAGE_MASK)
+		return -EINVAL;
+
+	mutex_lock(&kvm->lock);
+	switch (type) {
+	case KVM_VGIC_V2_ADDR_TYPE_DIST:
+		if (!IS_VGIC_ADDR_UNDEF(vgic->vgic_dist_base))
+			return -EEXIST;
+		if (addr + VGIC_DIST_SIZE < addr)
+			return -EINVAL;
+		kvm->arch.vgic.vgic_dist_base = addr;
+		break;
+	case KVM_VGIC_V2_ADDR_TYPE_CPU:
+		if (!IS_VGIC_ADDR_UNDEF(vgic->vgic_cpu_base))
+			return -EEXIST;
+		if (addr + VGIC_CPU_SIZE < addr)
+			return -EINVAL;
+		kvm->arch.vgic.vgic_cpu_base = addr;
+		break;
+	default:
+		r = -ENODEV;
+	}
+
+	if (vgic_ioaddr_overlap(kvm)) {
+		kvm->arch.vgic.vgic_dist_base = VGIC_ADDR_UNDEF;
+		kvm->arch.vgic.vgic_cpu_base = VGIC_ADDR_UNDEF;

Missing mutex_unlock?

+		return -EINVAL;
+	}
+
+	mutex_unlock(&kvm->lock);
+	return r;
+}

Regards
Dong Aisheng