This would be the known issue with the following upstream work-around:

commit a38647837a411f7df79623128421eef2118b5884
Author: Konrad Rzeszutek Wilk <[email protected]>
Date:   Fri Apr 29 11:34:00 2011 -0400

    xen/mmu: Add workaround "x86-64, mm: Put early page table high"

which tried to fix a regression caused by:

commit 4b239f458c229de044d6905c2b0f9fe16ed9e01e
Author: Yinghai Lu <[email protected]>
Date:   Fri Dec 17 16:58:28 2010 -0800
    
    x86-64, mm: Put early page table high

The mentioned work-around got reverted upstream and replaced by:

commit 279b706bf800b5967037f492dbe4fc5081ad5d0f
Author: Stefano Stabellini <[email protected]>
Date:   Thu Apr 14 15:49:41 2011 +0100

    x86,xen: introduce x86_init.mapping.pagetable_reserve

and

commit 53f8023febf9b3e18d8fb0d99c55010e473ce53d
Author: Sedat Dilek <[email protected]>
Date:   Sun Apr 17 16:17:34 2011 +0200

    x86/mm: Fix section mismatch derived from native_pagetable_reserve()

which have been added for the next upstream version. I tested locally
(amd system) and was having boot failures without that change on
m1.large equivalent configurations. Test booted the upstream fix on ec2
(m1.large and m1.2xlarge) with success as well.

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Changed in: linux (Ubuntu)
       Status: New => Triaged

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Stefan Bader (stefan-bader-canonical)

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https://bugs.launchpad.net/bugs/784345

Title:
  amd64 kernel does not boot in ec2 in m1.large

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