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This is a vestigial remnent of the pre xenstored stub domain days. Foreign mapping via MFN is a privileged operation which is not necessary, because grant details are unconditionally set up during domain construction. In practice, this means xenstored never uses its ability to foreign map the ring. Drop the ability completely, which removes the penultimate use of the unstable libxc interface. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Juergen Gross <jgross@suse.com>