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virtio: add API to detect legacy devices

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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>
This commit is contained in:
Michael S. Tsirkin 2014-12-04 18:49:58 +02:00
parent 48b36066b4
commit b6098c3042
2 changed files with 9 additions and 0 deletions
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7
drivers/virtio/virtio.c
View file

@ -3,6 +3,7 @@
#include <linux/virtio_config.h> #include <linux/virtio_config.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/idr.h> #include <linux/idr.h>
#include <uapi/linux/virtio_ids.h>
/* Unique numbering for virtio devices. */ /* Unique numbering for virtio devices. */
static DEFINE_IDA(virtio_index_ida); static DEFINE_IDA(virtio_index_ida);
@ -267,6 +268,12 @@ static struct bus_type virtio_bus = {
.remove = virtio_dev_remove, .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) int register_virtio_driver(struct virtio_driver *driver)
{ {
/* Catch this early. */ /* Catch this early. */

2
include/linux/virtio.h
View file

@ -108,6 +108,8 @@ struct virtio_device {
void *priv; void *priv;
}; };
bool virtio_device_is_legacy_only(struct virtio_device_id id);
static inline struct virtio_device *dev_to_virtio(struct device *_dev) static inline struct virtio_device *dev_to_virtio(struct device *_dev)
{ {
return container_of(_dev, struct virtio_device, dev); return container_of(_dev, struct virtio_device, dev);