From owner-freebsd-xen@FreeBSD.ORG  Thu Aug  9 23:57:46 2012
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From: Sean Bruno <seanbru@yahoo-inc.com>
To: arvind viswanathan <arvind.viswanathan@gmail.com>
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Date: Thu, 09 Aug 2012 16:57:20 -0700
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Cc: "freebsd-xen@freebsd.org" <freebsd-xen@freebsd.org>
Subject: Re: Q on types of xen virtualization
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On Thu, 2012-08-09 at 16:30 -0700, arvind viswanathan wrote:
> Hi,
> 
> I use a version of Freebsd 7 for my work and I was able to brint it up in
> Open xen 4.2 However the, OS version I use does not have any xen related
> files in it (no xen device folder, no xen folder in sys.., no change to the
> kernel config either) But the server we use supports virtualization. So is
> the mode that we are currently working in referred to as pure HVM ? I also
> hear about PV HVM and purely PV. I guess in PV HVM, we use a XEN
> configuration file and run on a machine supporting virtualization and
> currently 64 bit machines can only be run this way ? Can some one confirm
> if my understanding is right.
> Thanks
> arvind
> _______________________________________________

For full PV support, you can only use a 32bit version of FreeBSD 8 and
higher via the XEN kernel config.

For HVM mode you can use 64bit FreeBSD 8 and higher with the XENHVM
kernel config.  There is no PV support in 64bit mode at this time.

Sean