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Add the backing_src_type into struct userspace_mem_region. This struct already stores a lot of info about memory regions, except the backing source type. This info will be used by a future commit in order to determine the method for punching a hole. Reviewed-by: Oliver Upton <oliver.upton@linux.dev> Signed-off-by: Ricardo Koller <ricarkol@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20221017195834.2295901-7-ricarkol@google.com