KVM: support device deassignment

[safe/jmp/linux-2.6] / virt / kvm / kvm_main.c

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index c92b634..3238e08 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -530,6 +530,35 @@ out_free:
 }
 #endif
 
+#ifdef KVM_CAP_DEVICE_DEASSIGNMENT
+static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
+               struct kvm_assigned_pci_dev *assigned_dev)
+{
+       int r = 0;
+       struct kvm_assigned_dev_kernel *match;
+
+       mutex_lock(&kvm->lock);
+
+       match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
+                                     assigned_dev->assigned_dev_id);
+       if (!match) {
+               printk(KERN_INFO "%s: device hasn't been assigned before, "
+                 "so cannot be deassigned\n", __func__);
+               r = -EINVAL;
+               goto out;
+       }
+
+       if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)
+               kvm_deassign_device(kvm, match);
+
+       kvm_free_assigned_device(kvm, match);
+
+out:
+       mutex_unlock(&kvm->lock);
+       return r;
+}
+#endif
+
 static inline int valid_vcpu(int n)
 {
        return likely(n >= 0 && n < KVM_MAX_VCPUS);
@@ -1863,6 +1892,19 @@ static long kvm_vm_ioctl(struct file *filp,
                break;
        }
 #endif
+#ifdef KVM_CAP_DEVICE_DEASSIGNMENT
+       case KVM_DEASSIGN_PCI_DEVICE: {
+               struct kvm_assigned_pci_dev assigned_dev;
+
+               r = -EFAULT;
+               if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
+                       goto out;
+               r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
+               if (r)
+                       goto out;
+               break;
+       }
+#endif
        default:
                r = kvm_arch_vm_ioctl(filp, ioctl, arg);
        }