Runtime vdso need to be kept in some safe place when all
self-vmas are unmapped. So we reserve space for it in restorer
blob area and then remap it into. It's quite important to do
a remap here rather than data copy because otherwise pfn
of vdso disappear and in future we won't be able to detect
vdso are on dumping stage.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>