To get a better idea of what is wrong can you run a test for me please?
That is to boot the kernel+Xen without the 'dom0_mem' flag so that it
crashes. But lets make sure that on the Linux command line you have:
"console=hvc0 earlyprintk=xen debug loglevel=8" and for extra measure on
the Xen command line pls also append: "sync_console console=com1
com1=38400,8n1 loglvl=all guest_loglvl=all".

That should pinpoint where we fail.

Lastly, Stefan, is the kernel-debuginfo available somewhere easily? I am
mighty curious what EIP: ffffffff816415e1 is? I figured it has to be
pin_pagetable_pfn or xen_alloc_pte_init. And that the bug is somewhere
in the E820 parsing where it includes 228000 as RAM.

Also, it would be interesting to see if 'e820-mtrr-clip e820-verbose '
on the Xen command line resolves this as well?

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https://bugs.launchpad.net/bugs/1111470

Title:
  Precise kernel not bootable under Xen - alloc_l1_table

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