----- Original Message -----
> From: "Bill Davidsen" <david...@tmr.com>
> To: dl...@redhat.com
> Cc: xen@lists.fedoraproject.org, v...@lists.fedoraproject.org, "M A Young" 
> <m.a.yo...@durham.ac.uk>
> Sent: Monday, November 8, 2010 11:52:08 AM
> Subject: Re: [fedora-virt] [Fedora-xen] Dom0 xen support in Fedora 15?
> Dor Laor wrote:
> > On 11/08/2010 04:55 AM, M A Young wrote:
> >
> >> I am trying to work out whether it is practical to propose Dom0 xen
> >> support as a feature for Fedora 15.
> >>
> >> The kernel situation is that Domain 0 has been accepted upstream
> >> for
> >> 2.6.37. Assuming a 3 month kernel release cycle, F15 will most
> >> likely ship
> >> with a 2.6.37.x kernel, with 2.6.38 coming out either after the F15
> >> release or just before but too late to be included. If the plan to
> >> get key
> >> xen drivers into 2.6.38 succeeds, then F15 may be become usable as
> >> a
> >> Domain 0 system at some point during its lifetime as the kernel
> >> package in
> >> a Fedora version typically has one major update.
> >>
> >> If the kernel team accept backported patches then it might just be
> >> possible to ship F15 with usable Domain 0 support but the timescale
> >> for
> >> that would be very tight.
> >>
> >> The other thing we would need to consider is what needs to be done
> >> to make
> >> xen friendly enough to be usable by an ordinary user. The page
> >> https://fedoraproject.org/wiki/Features/XenPvopsDom0 contains plans
> >> from
> >> when dom0 xen support was expected to make a quick return to
> >> Fedora, but
> >> they are a couple of years old now so probably need updating.
> >>
> >> I think as a minimum we would need a way to add a dom0 enabled grub
> >> entry
> >> for a kernel, rather than requiring the user to hand edit the grub
> >> file.
> >> We should also make sure that xen works with the other Fedora
> >> virtualisation tools.
> >>
> >> What do others think about this? For example is it achievable as a
> >> feature, is it too early and better to wait for F16, and what else
> >> should
> >> we aim to do to make xen usable in Fedora?
> >>
> > Have you consider kvm? it's upstream since 2.6.20 and now its more
> > ready
> > than ever.
> >
> 
> There are some good tutorials which should explain the difference
> between xen and kvm, particularly the performance and hardware
> requirements of each.

re: hardware requirements, KVM's requirement for VT-X/AMD-V extensions 
certainly used to be a concern 2-3 years ago but today even laptops come with 
this support.
And regarding performance they days of Xen outperforming KVM have long-since 
passed.

> 
> --
> Bill Davidsen<david...@tmr.com>
> "We can't solve today's problems by using the same thinking we
> used in creating them." - Einstein
> 
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