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Date: Tue, 26 Nov 2013 22:56:11 -0600 (CST)
From: Scott Pilz <scottp@solarus.net>
To: Peter Grehan <grehan@freebsd.org>
Subject: Re: bhyve - non *bsd guests
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 	Thank you for your quick answer, and I'm not surprised by this. 
Makes perfect sense. I ran into the 1-CPU issue when I first started my 
testing.

 	I'll ensure that the new IX blade system we're going with as 
supported processors.

 	Keep up the great work. I'll be happy to do some extensive testing 
under various environments on this project if needed.

 	Scott

On Tue, 26 Nov 2013, Peter Grehan wrote:

> Hi Scott,
>
>>      The error I'm getting is:
>> 
>> VM unrestricted guest capability required
>> Error in initializing VM
>
> It's this one:
>
>> b) the CPU does not support what I'm trying to do
>
> Your 5570 CPU is a first-gen Nehalem. These models don't have 
> 'unrestricted-guest' VT-x support which is required to run code in 16/32-bit 
> mode with paging disabled. This feature arrived with Westmere and successors.
>
> grub-bhyve boots Linux and OpenBSD in 32-bit "flat" mode - protected mode 
> with paging disabled. This can only work if unrestricted-guest is supported 
> by the CPU. Other hypervisors work around this by using s/w instruction 
> emulation until paging is enabled.
>
> You'll find the same error if you start up a FreeBSD VM with > 1 vCPU since 
> the AP spinup code is started in 16-bit real mode.
>
> This doesn't show up with a single-vCPU FreeBSD guest since bhyveload sets 
> up a 64-bit execution environment for the kernel.
>
> later,
>
> Peter.
>
>