From 4e016f969529f2aec0545e90119e7eb3cb124c46 Mon Sep 17 00:00:00 2001 From: Yishai Hadas Date: Sun, 6 Nov 2022 19:46:18 +0200 Subject: vfio: Add an option to get migration data size Add an option to get migration data size by introducing a new migration feature named VFIO_DEVICE_FEATURE_MIG_DATA_SIZE. Upon VFIO_DEVICE_FEATURE_GET the estimated data length that will be required to complete STOP_COPY is returned. This option may better enable user space to consider before moving to STOP_COPY whether it can meet the downtime SLA based on the returned data. The patch also includes the implementation for mlx5 and hisi for this new option to make it feature complete for the existing drivers in this area. Signed-off-by: Yishai Hadas Reviewed-by: Jason Gunthorpe Reviewed-by: Longfang Liu Link: https://lore.kernel.org/r/20221106174630.25909-2-yishaih@nvidia.com Signed-off-by: Alex Williamson --- include/linux/vfio.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'include/linux') diff --git a/include/linux/vfio.h b/include/linux/vfio.h index e7480154825e..43b67e46a2cb 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -107,6 +107,9 @@ struct vfio_device_ops { * @migration_get_state: Optional callback to get the migration state for * devices that support migration. It's mandatory for * VFIO_DEVICE_FEATURE_MIGRATION migration support. + * @migration_get_data_size: Optional callback to get the estimated data + * length that will be required to complete stop copy. It's mandatory for + * VFIO_DEVICE_FEATURE_MIGRATION migration support. */ struct vfio_migration_ops { struct file *(*migration_set_state)( @@ -114,6 +117,8 @@ struct vfio_migration_ops { enum vfio_device_mig_state new_state); int (*migration_get_state)(struct vfio_device *device, enum vfio_device_mig_state *curr_state); + int (*migration_get_data_size)(struct vfio_device *device, + unsigned long *stop_copy_length); }; /** -- cgit v1.2.3