diff options
Diffstat (limited to 'drivers/vdpa')
| -rw-r--r-- | drivers/vdpa/vdpa.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c index fcf02a364878..cbc8fc69cf9b 100644 --- a/drivers/vdpa/vdpa.c +++ b/drivers/vdpa/vdpa.c @@ -297,6 +297,42 @@ void vdpa_mgmtdev_unregister(struct vdpa_mgmt_dev *mdev) } EXPORT_SYMBOL_GPL(vdpa_mgmtdev_unregister); +/** + * vdpa_get_config - Get one or more device configuration fields. + * @vdev: vdpa device to operate on + * @offset: starting byte offset of the field + * @buf: buffer pointer to read to + * @len: length of the configuration fields in bytes + */ +void vdpa_get_config(struct vdpa_device *vdev, unsigned int offset, + void *buf, unsigned int len) +{ + const struct vdpa_config_ops *ops = vdev->config; + + /* + * Config accesses aren't supposed to trigger before features are set. + * If it does happen we assume a legacy guest. + */ + if (!vdev->features_valid) + vdpa_set_features(vdev, 0); + ops->get_config(vdev, offset, buf, len); +} +EXPORT_SYMBOL_GPL(vdpa_get_config); + +/** + * vdpa_set_config - Set one or more device configuration fields. + * @vdev: vdpa device to operate on + * @offset: starting byte offset of the field + * @buf: buffer pointer to read from + * @length: length of the configuration fields in bytes + */ +void vdpa_set_config(struct vdpa_device *vdev, unsigned int offset, + const void *buf, unsigned int length) +{ + vdev->config->set_config(vdev, offset, buf, length); +} +EXPORT_SYMBOL_GPL(vdpa_set_config); + static bool mgmtdev_handle_match(const struct vdpa_mgmt_dev *mdev, const char *busname, const char *devname) { |