• Daniel Kiper's avatar
    xen/balloon: memory hotplug support for Xen balloon driver · 080e2be7
    Daniel Kiper authored
    Memory hotplug support for Xen balloon driver.  It should be mentioned
    that hotplugged memory is not onlined automatically.  It should be onlined
    by user through standard sysfs interface.
    
    Memory could be hotplugged in following steps:
    
      1) dom0: xl mem-max <domU> <maxmem>
         where <maxmem> is >= requested memory size,
    
      2) dom0: xl mem-set <domU> <memory>
         where <memory> is requested memory size; alternatively memory
         could be added by writing proper value to
         /sys/devices/system/xen_memory/xen_memory0/target or
         /sys/devices/system/xen_memory/xen_memory0/target_kb on dumU,
    
      3) domU: for i in /sys/devices/system/memory/memory*/state; do \
                 [ "`cat "$i"`" = offline ] && echo online > "$i"; done
    
    Memory could be onlined automatically on domU by adding following line to
    udev rules:
    
      SUBSYSTEM=="memory", ACTION=="add", RUN+="/bin/sh -c '[ -f /sys$devpath/state ] && echo online > /sys$devpath/state'"
    
    In that case step 3 should be omitted.
    Signed-off-by: default avatarDaniel Kiper <dkiper@net-space.pl>
    Acked-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    Cc: Ian Campbell <ian.campbell@citrix.com>
    Cc: Jeremy Fitzhardinge <jeremy@goop.org>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    080e2be7
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