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authorMichael S. Tsirkin <mst@redhat.com>2014-12-04 18:49:58 +0200
committerMichael S. Tsirkin <mst@redhat.com>2014-12-09 12:06:33 +0200
commitb6098c30423cb1f0f5a4d0a5495e2670e274e544 (patch)
tree6f3c5ebe2d6fe46677444406eddc8d3a9943a0ea
parent48b36066b48025b7cd7d46c9a879f2f72fd9086a (diff)
virtio: add API to detect legacy devices
transports need to be able to detect legacy-only devices (ATM balloon only) to use legacy path to drive them. Add a core API to do just that. The implementation just blacklists balloon: not too pretty, but let's not over-engineer. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
-rw-r--r--drivers/virtio/virtio.c7
-rw-r--r--include/linux/virtio.h2
2 files changed, 9 insertions, 0 deletions
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index fa6b75db5f1f..224f85442f3f 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -3,6 +3,7 @@
#include <linux/virtio_config.h>
#include <linux/module.h>
#include <linux/idr.h>
+#include <uapi/linux/virtio_ids.h>
/* Unique numbering for virtio devices. */
static DEFINE_IDA(virtio_index_ida);
@@ -267,6 +268,12 @@ static struct bus_type virtio_bus = {
.remove = virtio_dev_remove,
};
+bool virtio_device_is_legacy_only(struct virtio_device_id id)
+{
+ return id.device == VIRTIO_ID_BALLOON;
+}
+EXPORT_SYMBOL_GPL(virtio_device_is_legacy_only);
+
int register_virtio_driver(struct virtio_driver *driver)
{
/* Catch this early. */
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 2bbf62697671..d666bcb57401 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -108,6 +108,8 @@ struct virtio_device {
void *priv;
};
+bool virtio_device_is_legacy_only(struct virtio_device_id id);
+
static inline struct virtio_device *dev_to_virtio(struct device *_dev)
{
return container_of(_dev, struct virtio_device, dev);