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Date: Thu, 21 Jul 2011 07:38:23 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Matthew Seaman <m.seaman@infracaninophile.co.uk>
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	(wonkity.com [127.0.0.1]); Thu, 21 Jul 2011 07:38:23 -0600 (MDT)
Cc: freebsd-questions@freebsd.org
Subject: Re: virtualbox 4.0
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On Thu, 21 Jul 2011, Matthew Seaman wrote:

> On 21/07/2011 09:48, Minipot Gregg wrote:
>> It installed fine but when I got to the boot menu and pressed [enter] x2 it
>> said CPU doesnt support longmode
>
> This indicates trying to run an amd64 (64bit) kernel on an i386 (32bit)
> processor.  That's a synthetic processor inside VirtualBox, so unlike
> the real world, it's quite cheap to switch from one to the other...
>
> If you go to Settings :: General for your VM, did you choose OS as 'BSD'
> and Version as 'FreeBSD 64' ?
>
> I'm assuming the host you're running VirtualBox on is 64bit capable...

Recent versions of VirtualBox claim to be able to run a 64-bit VM on a 
32-bit host if the host CPU is 64-bit and has hardware virtualization 
support: http://forums.virtualbox.org/viewtopic.php?p=33940
(search for "64-bit guest")

So far I've only seen guest kernel panics when booting the kernel on an 
E8400 i386 FreeBSD host.