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[Xen-users] balloon question



hi all

i have two question about ballon.

1. 
cfg:
     memory=4096
     maxmem=4096

no pod was set , no balloon is set .
when xl create, i find function decrease_reservation is call.
i did not why ?

2.  pod + balloon
cfg:
     memory=512
     maxmem=4096

 decrease_reservation
    - p2m_pod_decrease_reservation
        - p2m_set_entry(p2m_invalid)
    - guest_remove_page
         - p2m_set_entry(p2m_invalid)

in p2m_pod_decrease_reservation ,  gfn entry is set p2c_invalid.
but in guest_remove_page gfn entry is set p2c_invalid again.
i did not know  why?

function  guest_remove_page  can delete  ?


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