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Date:      Wed, 30 May 2012 09:40:10 -0700
From:      Sean Bruno <seanbru@yahoo-inc.com>
To:        Carsten Heesch <ch@sysconfig.org.uk>
Cc:        "freebsd-xen@freebsd.org" <freebsd-xen@freebsd.org>, Lukas Laukamp <lukas@laukamp.me>
Subject:   Re: FreeBSD Xen Dom0 Support
Message-ID:  <1338396010.9051.3.camel@powernoodle-l7.corp.yahoo.com>
In-Reply-To: <05D52D66-D523-446D-A34F-56A4004698AC@sysconfig.org.uk>
References:  <4FC3B195.8020007@laukamp.me> <B6F285C4-47B8-429C-896F-DBC32E39F91A@sysconfig.org.uk> <4FC3C83B.503@laukamp.me> <20120528220305.GC16584@smp.if.uj.edu.pl> <4FC3FB04.8050500@laukamp.me>	<20120528224815.GE16584@smp.if.uj.edu.pl> <4FC618DB.5060901@laukamp.me> <05D52D66-D523-446D-A34F-56A4004698AC@sysconfig.org.uk>

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On Wed, 2012-05-30 at 07:56 -0700, Carsten Heesch wrote:
> However, if you intend to run 64bit, you are restricted to HVM (use
> the XENHVM kernel to get better performance from the optimised device
> drivers for HVM). 
> If you are planning on running 32bit, you can use PV.
> I think that is still valid for 9.0. And mind you, PV is (or was?)
> also limited to about 850M memory in the DomU. 
> 
> 

A couple of nits here, alc@ fixed the PV memory restrictions so the 850M
limit isn't a thing anymore:

FreeBSD ref9-xen32.freebsd.org 9.0-STABLE FreeBSD 9.0-STABLE #2 r231914:
Mon Feb 20 05:30:49 PST 2012
sbruno@ref9-xen32.freebsd.org:/var/tmp/dumpster/scratch/sbruno-scratch/9/sys/XEN  i386
[sbruno@ref9-xen32 ~]$ sysctl hw.physmem
hw.physmem: 2136674304


And, I think, there is a 64bit PV config now in development at:
http://svnweb.freebsd.org/base/projects/amd64_xen_pv/

This is prerequisite work for a dom0 on freebsd which is under
development.  Stay tuned, things are happening!

Sean





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