OK. so I realize how I incorrectly read the comments in
drivers/xen/console/console.c.  I had assumed that you should pass
'xencons=hvc' and it would allocate one hvcX device.  Instead, I tried:

xencons=hvc0 console=hvc0 and I see:
[    0.000000] Kernel command line: root=LABEL=uec-rootfs ro xencons=hvc0 
console=hvc0 
[    0.000000] console [hvc0] enabled
[    0.836722] Xen virtual console successfully installed as hvc0

and, I get all the data.

So, I see 2 solutions to this:
a.) change update-grub-legacy-ec2 to add 'xencons=hvc0 console=hvc0' (it 
already does console=hvc0).
b.) change the kernel default to be hvc0.  I haven't verified it, but just from 
the data above, it would appear that it is defaulting to 'tty1'.

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https://bugs.launchpad.net/bugs/682831

Title:
  lost console output early in boot

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