Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit b6098c30 authored by Michael S. Tsirkin's avatar Michael S. Tsirkin
Browse files

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: default avatarMichael S. Tsirkin <mst@redhat.com>
Acked-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
parent 48b36066

drivers/virtio/virtio.c

+7 −0
Original line number Diff line number Diff line
@@ -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. */

include/linux/virtio.h

+2 −0
Original line number Diff line number Diff line
@@ -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);