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| author | Yishai Hadas <yishaih@nvidia.com> | 2022-11-06 20:46:18 +0300 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2022-11-14 21:37:07 +0300 |
| commit | 4e016f969529f2aec0545e90119e7eb3cb124c46 (patch) | |
| tree | 2d1bec6a818248fdf4e1f5d9b49cdc1da62949b0 /include/linux/vfio.h | |
| parent | 913447d06f032a9e9c84870bec0b1adb8c588f29 (diff) | |
| download | linux-4e016f969529f2aec0545e90119e7eb3cb124c46.tar.xz | |
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 <yishaih@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Longfang Liu <liulongfang@huawei.com>
Link: https://lore.kernel.org/r/20221106174630.25909-2-yishaih@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'include/linux/vfio.h')
| -rw-r--r-- | include/linux/vfio.h | 5 |
1 files changed, 5 insertions, 0 deletions
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); }; /** |