[XenPPC] JS21 and Dom0 memory

[Jimi Xenidis <jimix@xxxxxxxxxxxxxx>]

In case you missed it, Dom0 will get more memory now beyond the RMA.
The default is 1/16th of memory or 192M which ever is larger.

The 1/16th is suggested by the x86 Xen build
The 192M comes from noting that > 128M is good and <= 256 is enuff to  
make my maple (512M max) happy, so 256M - 64M.
Performance is now way better and the JS21 should have access to  
their disks as rootfs.
You can change this amount my adding "dom0_mem=<n>[Gg|Mm|Kk|Bb]" to  
your Xen options.
-JX

> # HG changeset patch
> # User Jimi Xenidis <jimix@xxxxxxxxxxxxxx>
> # Node ID f8233165fb80982c36cc8a124c6e017821805843
> # Parent  228d1441ee7207d56400aa455e57ca68ad6c5729
> [POWERPC][XEN] Allocate more memory than RMA for Dom0
>
> The following patch will only effect Dom0 at the moment and allow it
> to be created with memory larger than RMA.  It works by allocating
> extents (AKA chunks) of memory of an order specified by the processor.
> The extent size should be a value that is capabable of mapping a
> "large page" so we use the 970s large page size.  These extents are
> tracked by an extents list that simply tracks these page allocations
> and what there mapping is.  Other sub-systems effected by this:
>   - Dom0 OFD devtree /memory cleanup
>   - log_large_page_sizes is now an array
>   - Config for minumum Dom0 size
>
> Caveats:
>  - There is a hack around HTAB allocation because we currently
>    allocate one at domain creation time, this will be correct by a
>    patch to follow.
>  - Dom0, or domains capable of mapping mfns byt have their extents be
>    PFN=MFN
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