Re: [Xen-users] Dom0 for FreeBSD or Illumos

[Miles Fidelman <mfidelman@xxxxxxxxxxxxxxxx>]

Roger Pau Monné wrote:
> On 23/07/14 16:17, Miles Fidelman wrote:
> > Roger Pau Monné wrote:
> > > I haven't seen any questions regarding this on the FreeBSD-Xen mailing
> > > list recently:
> > >
> > > http://lists.freebsd.org/pipermail/freebsd-xen/2014-July/thread.html
> > Odd, I posted something the other day - just looked at the server log,
> > and for some reason it bounced.  Guess I don't have so resend at this
> > point.
> >
> > > I have prototype for a FreeBSD Dom0, it is still in the very early
> > > stages, but the code can be found at:
> > >
> > > http://xenbits.xen.org/gitweb/?p=people/royger/freebsd.git;a=shortlog;h=refs/heads/pvh_dom0_v5.2
> > >
> > >
> > > Setting it up is very convoluted right now, I expect it will be much
> > > more easier once the patches are merged and Xen 4.5 is released with
> > > support for running Dom0 PVH.
> > Does that imply that it might not run pure PV?
> Yes, it won't run as pure PV, the FreeBSD port I've been working on is
> PVH only. IMHO working on pure PV support now is quite useless, it
> performs worse and requires a lot more of code/hacks in the OS, which
> makes it hard to maintain in the long run.
>
> That doesn't mean you cannot create pure PV guests from a PVH Dom0,
> that's fully supported and working fine.
That doesn't help me. I'm looking at a few older machines that still 
have plenty of life in them.  If I had all newer hardware, then the 
hypervisor universe gets considerably larger.
> > One thing I've been wondering is, given the amount of virtualization
> > related functionality that's moving into the Linux Kernel, is that
> > creating divergence that makes it hard to support other kernels (notably
> > BSD* and Illumos?).  It sure would be sweet to see Xen on SmartOS.
> Not sure what you mean by that. The interface between the guest OSes and
> Xen is not defined by the Linux kernel, it is a public interface defined
> by Xen, which is designed to be OS agnostic.
I was thinking more about Dom0.  Seems like a lot of virtualization 
functionality is now included in the Linux Kernel - and to the extent 
that the Dom0 makes use of that, it would seem that the Dom0 codebases 
would start diverging by platform.
Miles




--
In theory, there is no difference between theory and practice.
In practice, there is.   .... Yogi Berra


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