It's an artifact of the initialization code and how the xen domain builder
configures the initial mapped memory. I've come against this and fixed this
issue in the past but I guess either the domain builder has changed or the
initial code has bit rotted. I can't commit so ask Colin if he can fix.

Cheers

On Tuesday, July 26, 2011, Sean Bruno <sean...@yahoo-inc.com> wrote:
> I note that if I scale the i386 PV Xen kernel past 855MB, I get an insta
> panic at boot.  I assume that there's a hard limit on the amount of RAMS
> we can use here?
>
> Using config file "./ref8-xen32".
> Started domain ref8-xen32 (id=133)
> WARNING: loader(8) metadata is missing!
> GDB: no debug ports present
> KDB: debugger backends: ddb
> KDB: current backend: ddb
> Copyright (c) 1992-2011 The FreeBSD Project.
> Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
>        The Regents of the University of California. All rights
> reserved.
> FreeBSD is a registered trademark of The FreeBSD Foundation.
> FreeBSD 8.2-STABLE #1 r224449: Tue Jul 26 09:53:36 PDT 2011
>
> sbr...@ref8-xen32.freebsd.org:/usr/obj/dumpster/scratch/sbruno-scratch/8/sys/XEN
i386
> WARNING: WITNESS option enabled, expect reduced performance.
> panic: pmap_init: page table page is out of range
> cpuid = 0
> KDB: enter: panic
> [thread pid 0 tid 0 ]
> Stopped at      0xc010e68a:     movl    $0,0xc03f20b4
>
>
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