[XenPPC] RMA and Real memory

[Jimi Xenidis <jimix@xxxxxxxxxxxxxx>]

Currently when we create a domain we immediately allocate its RMA.
Previously we allowed the xend tools to fail when allocating more  
memory.
However, when the tools probe to see if there is enuf memory to  
allocate the expected failing one it goes after the balloon driver.
specific example:
RAM=256M
RMA=64M
Xen gets 64M
Some small domheap allocations occur eating up about <5M (the page  
frame table mostly)
Dom0 get 64M
DomU creation allocates 64M for RMA
Xend sees only 59M left and goes after the balloon driver.
BUSTED!

Anyway.. we need to get a handle on this... thoughts?
-JX

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