boot failure on Xen 3.4.x

[marcotte%panix.com@localhost (Brian Marcotte)]

This has reported here in the past, so I'm wondering if anyone knows
why NetBSD doesn't boot on Xen 3.4.1.

The only place I've seen NetBSD boot under Xen 3.4 was on a machine
with less than 4 GB of RAM.

Thanks.

- Brian

-------------------------

    Loaded initial symtab at 0xc052ddb8, strtab at 0xc0566e2c, # entries 13660
    Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
        2006, 2007, 2008, 2009
        The NetBSD Foundation, Inc.  All rights reserved.
    Copyright (c) 1982, 1986, 1989, 1991, 1993
        The Regents of the University of California.  All rights reserved.

    NetBSD 5.0.1 (PANIX-VC) #0: Tue Sep 22 22:35:38 EDT 2009
            
root%juggler.panix.com@localhost:/misc3/obj/misc2/devel/netbsd/5.0.1-user/src/sys/arch/i386/compile/PANIX-VC
    total memory = 150 MB
    avail memory = 140 MB
    mainbus0 (root)
    hypervisor0 at mainbus0: Xen version 3.4
    vcpu0 at hypervisor0: Intel 686-class, 2333MHz, id 0x10676
    xenbus0 at hypervisor0: Xen Virtual Bus Interface
    xencons0 at hypervisor0: Xen Virtual Console Driver
    xencons0: using event channel 2
    npx0 at hypervisor0: using exception 16
    xbd0 at xenbus0 id 0: Xen Virtual Block Device Interface
    xpq_flush_queue: 1 entries
    0x00000004f0d7f820: 0x00000000fa2f8003
    panic: HYPERVISOR_mmu_update failed

    Begin traceback...
    uvm_fault(0xc0505f80, 0, 1) -> 0xe
    fatal page fault in supervisor mode
    trap type 6 code 0 eip c03ed8f1 cs 9 eflags 10246 cr2 1 ilevel 6
    panic: trap
    Faulted in mid-traceback; aborting...rebooting...