Fix the report of dirty_bytes upon pre-copy to include both the existing data on the migration file and the device extra bytes. This gives a better close estimation to what can be passed any more as part of pre-copy. Fixes: 0dce165b1adf ("vfio/mlx5: Introduce vfio precopy ioctl implementation") Signed-off-by: Yishai Hadas <yishaih@xxxxxxxxxx> --- drivers/vfio/pci/mlx5/main.c | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-) diff --git a/drivers/vfio/pci/mlx5/main.c b/drivers/vfio/pci/mlx5/main.c index e897537a9e8a..d95fd382814c 100644 --- a/drivers/vfio/pci/mlx5/main.c +++ b/drivers/vfio/pci/mlx5/main.c @@ -442,16 +442,10 @@ static long mlx5vf_precopy_ioctl(struct file *filp, unsigned int cmd, if (migf->pre_copy_initial_bytes > *pos) { info.initial_bytes = migf->pre_copy_initial_bytes - *pos; } else { - buf = mlx5vf_get_data_buff_from_pos(migf, *pos, &end_of_data); - if (buf) { - info.dirty_bytes = buf->start_pos + buf->length - *pos; - } else { - if (!end_of_data) { - ret = -EINVAL; - goto err_migf_unlock; - } - info.dirty_bytes = inc_length; - } + info.dirty_bytes = migf->max_pos - *pos; + if (!info.dirty_bytes) + end_of_data = true; + info.dirty_bytes += inc_length; } if (!end_of_data || !inc_length) { -- 2.18.1