vfio/mlx5: Enforce a single SAVE command at a time
Enforce a single SAVE command at a time. As the SAVE command is an asynchronous one, we must enforce running only a single command at a time. This will preserve ordering between multiple calls and protect from races on the migration file data structure. This is a must for the next patches from the series where as part of PRE_COPY we may have multiple images to be saved and multiple SAVE commands may be issued from different flows. Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Yishai Hadas <yishaih@nvidia.com> Link: https://lore.kernel.org/r/20221206083438.37807-4-yishaih@nvidia.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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