Commit 4928f67b authored by Yishai Hadas's avatar Yishai Hadas Committed by Alex Williamson
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vfio/mlx5: Fix the report of dirty_bytes upon pre-copy 



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: 0dce165b ("vfio/mlx5: Introduce vfio precopy ioctl implementation")
Signed-off-by: default avatarYishai Hadas <yishaih@nvidia.com>
Link: https://lore.kernel.org/r/20230308155723.108218-1-yishaih@nvidia.com


Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent eeac8ede

drivers/vfio/pci/mlx5/main.c

+4 −10
Original line number Diff line number Diff line
@@ -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) {