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Diffstat (limited to 'virt/kvm/kvm_main.c')
-rw-r--r--virt/kvm/kvm_main.c39
1 files changed, 34 insertions, 5 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index fc1b58a7275..9c2fd025b8a 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2533,21 +2533,50 @@ int kvm_io_bus_read(struct kvm_io_bus *bus, gpa_t addr, int len, void *val)
return -EOPNOTSUPP;
}
-void kvm_io_bus_register_dev(struct kvm *kvm, struct kvm_io_bus *bus,
+int kvm_io_bus_register_dev(struct kvm *kvm, struct kvm_io_bus *bus,
struct kvm_io_device *dev)
{
+ int ret;
+
down_write(&kvm->slots_lock);
- __kvm_io_bus_register_dev(bus, dev);
+ ret = __kvm_io_bus_register_dev(bus, dev);
up_write(&kvm->slots_lock);
+
+ return ret;
}
/* An unlocked version. Caller must have write lock on slots_lock. */
-void __kvm_io_bus_register_dev(struct kvm_io_bus *bus,
- struct kvm_io_device *dev)
+int __kvm_io_bus_register_dev(struct kvm_io_bus *bus,
+ struct kvm_io_device *dev)
{
- BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
+ if (bus->dev_count > NR_IOBUS_DEVS-1)
+ return -ENOSPC;
bus->devs[bus->dev_count++] = dev;
+
+ return 0;
+}
+
+void kvm_io_bus_unregister_dev(struct kvm *kvm,
+ struct kvm_io_bus *bus,
+ struct kvm_io_device *dev)
+{
+ down_write(&kvm->slots_lock);
+ __kvm_io_bus_unregister_dev(bus, dev);
+ up_write(&kvm->slots_lock);
+}
+
+/* An unlocked version. Caller must have write lock on slots_lock. */
+void __kvm_io_bus_unregister_dev(struct kvm_io_bus *bus,
+ struct kvm_io_device *dev)
+{
+ int i;
+
+ for (i = 0; i < bus->dev_count; i++)
+ if (bus->devs[i] == dev) {
+ bus->devs[i] = bus->devs[--bus->dev_count];
+ break;
+ }
}
static struct notifier_block kvm_cpu_notifier = {