Commit f05bc135 authored by jiangdongxu's avatar jiangdongxu
Browse files

vdpa: add device state operations 

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I86ITO



----------------------------------------------------------------------

Introduce several interfaces to allow vdpa device save/load device
status when guest machine resume and suspend.

The get_dev_buffer_size interface is used to get the buffer size
of vdpa device status.

The get_dev_buffer interface is used to get the device buffer from
vdpa device, and VMM can save it.

The set_dev_buffer interface is used to set the device status from
userspace.

These operations are optional. If they are not implemented, return
EOPNOTSUPP.

Signed-off-by: default avatarjiangdongxu <jiangdongxu1@huawei.com>
parent 41808a72

include/linux/vdpa.h

+20 −0
Original line number Diff line number Diff line
@@ -302,6 +302,19 @@ struct vdpa_map_file { 
 * @log_sync			Synchronize logging buffer from kernel space to

 *				user space. (optional)

 *				@vdev: vdpa device

 * @get_dev_buffer_size		Get device state buffer size. (optional)

 *				@vdev: vdpa device

 *				Return device status buffer size of vdpa device.

 * @get_dev_buffer		Get device state buffer. (optional)

 *				@vdev: vdpa device

 *				@offset: offset of dest for saving device state.

 *				@dest: userspace address for saving device state.

 *				@len: device state buffer length.

 * @set_dev_buffer		Set device state buffer. (opetional)

 *				@vdev: vdpa device

 *				@offset: offset of src addr of device state.

 *				@src: userspace addr of device state

 *				@len: device state buffer length.

 * @free:			Free resources that belongs to vDPA (optional)

 *				@vdev: vdpa device

 */
@@ -371,6 +384,13 @@ struct vdpa_config_ops { 
	int (*set_log_size)(struct vdpa_device *vdev, uint64_t size);

	int (*log_sync)(struct vdpa_device *vdev);



	/* device state ops */

	uint32_t (*get_dev_buffer_size)(struct vdpa_device *vdpa);

	int (*get_dev_buffer)(struct vdpa_device *vdev, unsigned int offset,

			      void __user *dest, unsigned int len);

	int (*set_dev_buffer)(struct vdpa_device *vdev, unsigned int offset,

			      const void __user *src, unsigned int len);



	/* Free device resources */

	void (*free)(struct vdpa_device *vdev);

};