From 224de6f886f8184fd448700a6d78f216694de948 Mon Sep 17 00:00:00 2001 From: Jason Wang Date: Wed, 14 Aug 2024 13:22:26 +0800 Subject: virtio: allow driver to disable the configure change notification Sometime, it would be useful to disable the configure change notification from the driver. So this patch allows this by introducing a variable config_change_driver_disabled and only allow the configure change notification callback to be triggered when it is allowed by both the virtio core and the driver. It is set to false by default to hold the current semantic so we don't need to change any drivers. The first user for this would be virtio-net. Cc: Venkat Venkatsubra Cc: Gia-Khanh Nguyen Acked-by: Michael S. Tsirkin Signed-off-by: Jason Wang Link: https://patch.msgid.link/20240814052228.4654-3-jasowang@redhat.com Signed-off-by: Jakub Kicinski --- include/linux/virtio.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'include') diff --git a/include/linux/virtio.h b/include/linux/virtio.h index de6d3cc176d9..306137a15d07 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -119,6 +119,8 @@ struct virtio_admin_cmd { * @index: unique position on the virtio bus * @failed: saved value for VIRTIO_CONFIG_S_FAILED bit (for restore) * @config_core_enabled: configuration change reporting enabled by core + * @config_driver_disabled: configuration change reporting disabled by + * a driver * @config_change_pending: configuration change reported while disabled * @config_lock: protects configuration change reporting * @vqs_list_lock: protects @vqs. @@ -136,6 +138,7 @@ struct virtio_device { int index; bool failed; bool config_core_enabled; + bool config_driver_disabled; bool config_change_pending; spinlock_t config_lock; spinlock_t vqs_list_lock; @@ -166,6 +169,10 @@ void __virtqueue_break(struct virtqueue *_vq); void __virtqueue_unbreak(struct virtqueue *_vq); void virtio_config_changed(struct virtio_device *dev); + +void virtio_config_driver_disable(struct virtio_device *dev); +void virtio_config_driver_enable(struct virtio_device *dev); + #ifdef CONFIG_PM_SLEEP int virtio_device_freeze(struct virtio_device *dev); int virtio_device_restore(struct virtio_device *dev); -- cgit v1.2.3-58-ga151